CN109083591B

CN109083591B - Drilling bored concrete pile body and pile cap integrated drilling pore-forming method

Info

Publication number: CN109083591B
Application number: CN201810946112.4A
Authority: CN
Inventors: 仲维玲; 朱红桃
Original assignee: China Railway 20th Bureau Group Corp
Current assignee: China Railway 20th Bureau Group Corp
Priority date: 2018-08-20
Filing date: 2018-08-20
Publication date: 2021-04-02
Anticipated expiration: 2038-08-20
Also published as: CN109083591A

Abstract

The invention discloses a drilling and pouring pile body and pile cap integrated drilling pore-forming method, which comprises the following steps: firstly, processing a pile cap construction device: processing the pile cap construction device according to the diameters of the pile body and the pile cap in the constructed cast-in-situ bored pile and the height of the pile cap; the pile cap construction device comprises a pile cap drill bit and a drill bit guide frame for guiding the pile cap drill bit, wherein the pile cap drill bit comprises a drill cylinder and spiral drill cutters which are distributed on the outer side wall of the lower part from top to bottom along the circumferential direction of the drill cylinder; secondly, positioning a drilling machine; thirdly, installing a pile cap construction device; fourthly, drilling a pile cap forming hole; and fifthly, drilling the pile body forming hole. The method has simple steps, reasonable design, simple and convenient construction and good use effect, the pile cap drill bit and the drill bit guide frame are additionally arranged on the long screw pile machine to form the pile cap construction device, the drill rod of the long screw pile machine is adopted to drive the pile cap construction device to rotate to complete the drilling of the pile cap forming hole, no power equipment is required to be additionally arranged, and the integrated drilling hole forming construction of the pile cap and the pile body can be realized.

Description

Drilling bored concrete pile body and pile cap integrated drilling pore-forming method

Technical Field

The invention belongs to the technical field of pile foundation construction, and particularly relates to a drilling and pouring pile body and pile cap integrated drilling hole forming method.

Background

The cast-in-situ bored pile has higher safety and stronger stability, namely, concrete slurry permeates to the deep part of a soil layer, so that the soil layer and a cast-in-situ pile body are tightly combined, the foundation is firmer and more reliable, and meanwhile, the cast-in-situ pile can effectively control the settlement of the foundation, thereby generating a compaction effect on the soil layer; the cast-in-situ bored pile plays good functions of penetration, compaction and splitting on a soil layer, and the soil layer is more stable due to interaction among the cast-in-situ bored pile, the compaction and the splitting. In actual construction, the cast-in-situ bored pile is a pile formed by drilling a pile hole in situ by using a drilling machine such as a spiral drilling machine or a submersible drilling machine and pouring concrete into the pile hole (or suspending a reinforcement cage in the pile hole), and the cast-in-situ bored pile has no vibration and does not squeeze soil during construction, but has a slightly large settlement amount. The auger machine is suitable for cohesive soil, sandy soil, artificial filling soil and the like above the ground water level, drilled soil blocks rise out of a discharge hole along a helical blade on a drill rod, the hole diameter is about 300mm, the drilling depth is 8-12 m, and the drill rod is selected according to the soil quality and the water content.

The long screw pile driver is also called a long screw drilling machine, and comprises a hydraulic walking pile frame and a drilling system. The pile frame is generally a hydraulic walking chassis, has high automation degree, can automatically walk and rotate for 360 degrees, is provided with four hydraulic support legs and a walking oil cylinder to assist walking and rotating and simultaneously increase the stability of the whole machine during construction, and can be transported by the whole machine. The upright post of the pile frame is a foldable box-type upright post. The drilling system comprises a power head and a drilling tool, an output shaft of the power head and the spiral drilling tool are hollow, the pile machine adopts long spiral hole forming, concrete (or slurry) pumping can be carried out in a drill rod, and pile body construction is completed, namely hole drilling and hole forming can be completed at one time, and the pile machine can also be used for construction by adopting various construction methods such as deep stirring after changing the drilling tool through dry hole forming and grouting replacement. At present, when a long spiral drilling machine is adopted for drilling and filling pile construction, pile body construction is carried out, pile cap construction is carried out after pile body forming, and the working procedures of pile soil excavation, pile head cutting, pile cap construction, pile periphery backfill tamping and the like need to be carried out, so that the defects of multiple working procedures, long construction time, higher cost and the like are overcome.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a method for integrally drilling and forming a hole by a pile body and a pile cap of a bored pile, aiming at the defects in the prior art, wherein the method has the advantages of simple steps, reasonable design, simple and convenient construction and good use effect.

In order to solve the technical problems, the invention adopts the technical scheme that: a drilling and pouring pile body and pile cap integrated drilling hole forming method is characterized in that: the constructed cast-in-situ bored pile comprises a pile body and a pile cap coaxially arranged at the upper part of the pile body, wherein the pile body and the pile cap are connected into a whole, the cross sections of the pile body and the pile cap are both circular, and the pile cap and the pile body are both vertically arranged; the diameters of the pile bodies are the same from bottom to top;

when carrying out pile body and pile cap integration drilling pore-forming construction to the bored concrete pile that is under construction, including following step:

step one, processing a pile cap construction device: processing the pile cap construction device according to the diameters of the pile body and the pile cap in the constructed cast-in-situ bored pile and the height of the pile cap;

the pile cap construction device comprises a pile cap drill bit for performing pore-forming construction on a pile cap of a constructed cast-in-situ bored pile and a drill bit guide frame for guiding the pile cap drill bit, wherein the drill bit guide frame is arranged on the pile cap drill bit, the pile cap drill bit is vertically arranged, and the drill bit guide frame is horizontally arranged;

the pile cap drill comprises a drill cylinder and spiral drill cutters distributed on the outer side wall of the lower part of the drill cylinder from top to bottom along the circumferential direction of the drill cylinder, the drill cylinder is a cylindrical steel sleeve which is coaxially sleeved on a drill rod of a long spiral pile machine from bottom to top and is driven by the drill rod to synchronously rotate, a rotary pushing mechanism for pushing the drill cylinder to synchronously rotate is arranged on the drill rod, and the vertical distance between the rotary pushing mechanism and the bottom end of the drill rod is not more than the height of the drill cylinder; the spiral drill cutter is a spiral blade, and the height of the spiral drill cutter is not less than the height of the pile cap;

the pile cap is a cylindrical pile cap or a conical frustum-shaped pile cap, and the spiral drill is a cylindrical drill for drilling a pile cap forming hole of the cylindrical pile cap or a conical frustum-shaped drill for drilling a pile cap forming hole of the conical frustum-shaped pile cap;

the diameters of the cylindrical pile caps are the same from bottom to top, and the diameters of the cylindrical pile caps are larger than the diameter of the pile body; the outer diameter of the cylindrical drill cutter is the same from bottom to top, the outer diameter of the cylindrical drill cutter is the same as the diameter of the cylindrical pile cap, and the width of the cylindrical drill cutter is the same from bottom to top.

The diameter of the cone frustum-shaped pile cap is gradually increased from bottom to top, and the diameter of the bottom of the cone frustum-shaped pile cap is the same as that of the pile body; the outer diameter of the cone frustum-shaped drill is gradually increased from bottom to top, the outer diameter of the bottom of the cone frustum-shaped drill is the same as the diameter of the pile body, and the width of the cone frustum-shaped drill is gradually increased from bottom to top;

the drill guide frame comprises a fixed lantern ring coaxially sleeved on the drill cylinder and a lantern ring fixing piece for mounting the fixed lantern ring on a pile frame of the long screw pile machine, the fixed lantern ring and the lantern ring fixing piece are both horizontally arranged, one end of the lantern ring fixing piece is connected with the fixed lantern ring, and the other end of the lantern ring fixing piece is connected with the pile frame;

step two, positioning a drilling machine: moving the long screw pile machine to a construction area of the constructed cast-in-situ bored pile, and enabling the drill rod to be positioned right above the pile position of the constructed cast-in-situ bored pile;

step three, installing a pile cap construction device: installing a pile cap construction device on the long screw pile machine which is moved in place in the step two;

when the pile cap construction device is installed, the drill cylinder is coaxially sleeved on the lower part of the drill rod from bottom to top, and the bottom of the drill cylinder is flush with the bottom of the drill rod; meanwhile, the lantern ring fixing piece of the drill guide frame is connected with the pile frame of the long spiral pile driver;

drilling a pile cap forming hole: drilling from top to bottom by adopting a drill rod, and pushing a pile cap drill bit to synchronously drill from top to bottom by a rotary pushing mechanism on the drill rod in the drilling process to obtain a pile cap forming hole formed by construction;

in the step, the drill rod and the pile cap construction device form a pile cap drilling pore-forming device;

step five, drilling a pile body forming hole: and disconnecting the drill rod from the pile cap drill bit, and continuously drilling from top to bottom by adopting the drill rod to obtain a pile body forming hole for construction forming.

The drilling and pouring pile body and pile cap integrated drilling pore-forming method is characterized in that: and fifthly, after the pile body forming hole is formed, lifting the drill rod upwards until the drill rod is lifted out of the pile cap forming hole, and simultaneously lifting the pile cap drill bit out of the pile cap forming hole.

The drilling and pouring pile body and pile cap integrated drilling pore-forming method is characterized in that: the drill bit guide frame in the first step is a movable guide frame which can vertically move up and down along the pile frame and drive the pile cap drill bit to synchronously move up and down, the fixed sleeve ring is sleeved on the outer side of the upper part of the pile cap drill bit, and the spiral drill bit is positioned below the fixed sleeve ring; the outer side wall of the upper part of the drill cylinder is provided with a lantern ring limiting part for limiting a fixed lantern ring, the lantern ring limiting part comprises an upper limiting part and a lower limiting part which is positioned right below the upper limiting part, the upper limiting part and the lower limiting part are both horizontally arranged and are both fixed on the outer side wall of the upper part of the drill cylinder; the fixed lantern ring is a cylindrical lantern ring clamped between the upper limiting piece and the lower limiting piece.

The drilling and pouring pile body and pile cap integrated drilling pore-forming method is characterized in that: the long spiral pile machine comprises the pile frame and a drilling system, wherein the pile frame comprises an upright post and a moving mechanism for driving the upright post to move; the drilling system comprises a drilling tool and a power head for driving the drilling tool, and a guide rail for enabling the power head to move up and down is arranged on the stand column;

the lantern ring fixing piece comprises a clamping piece which is clamped on the guide rail and can move up and down along the guide rail, the fixing lantern ring and the clamping piece are fixedly connected through a connecting piece, and the clamping piece and the connecting piece are arranged on the same horizontal plane.

The drilling and pouring pile body and pile cap integrated drilling pore-forming method is characterized in that: the clamping piece comprises two clamping jaws which are symmetrically clamped on the guide rail and are positioned on the same horizontal plane, the clamping jaws are horizontally arranged, clamping grooves clamped on the guide rail are formed in the front sides of the clamping jaws, and the rear ends of the clamping jaws are fixed on the connecting piece.

The drilling and pouring pile body and pile cap integrated drilling pore-forming method is characterized in that: the drill rod in the first step comprises a core rod and a threaded blade arranged on the outer side of the core rod from bottom to top, the core rod is a cylindrical rod, the spiral drill cutter is a threaded drill cutter, and the threaded blade and the spiral drill cutter are in the same thread direction;

a pushed piece pushed by the rotary pushing mechanism is arranged on the drill barrel; the driven member comprises a plurality of power transmission members which are distributed at the top of the drilling barrel along the circumferential direction, the rotary pushing mechanism comprises a plurality of rotary pushing members which are distributed on the threaded blades and push the power transmission members, each power transmission member is pushed by one rotary pushing member, and each rotary pushing member is positioned at the rear side of the pushed power transmission member.

The drilling and pouring pile body and pile cap integrated drilling pore-forming method is characterized in that: the power transmission pieces are uniformly distributed on the same horizontal plane; each power transmission part comprises a vertical stop block fixed on the outer side of the top of the drill cylinder and a horizontal pin shaft arranged on the vertical stop block, and the vertical stop block is provided with a through hole for the horizontal pin shaft to be inserted; the structure and the size of the horizontal pin shafts are the same, the horizontal pin shafts are distributed along the circumferential direction, and the central axes of the horizontal pin shafts are intersected with the central axis of the drill cylinder; the horizontal distance between the inner end of each horizontal pin shaft and the central axis of the drill cylinder is larger than

Wherein d is the outer diameter of the core rod;

when the pile cap construction device is installed in the third step, horizontal pin shafts are inserted into all vertical stop blocks at the top of the drill cylinder, and the inserted horizontal pin shafts are positioned on the front side of one rotary pushing piece;

and fifthly, when the connection between the drill rod and the pile cap drill bit is disconnected, pulling out the horizontal pin shafts from the vertical stop blocks.

The drilling and pouring pile body and pile cap integrated drilling pore-forming method is characterized in that: moving the long screw pile machine to a construction area of a constructed cast-in-situ bored pile, and then lifting a drill rod upwards, wherein the vertical distance between the bottom of the drill rod and the ground is larger than the height of a drill cylinder;

two lifting lugs are symmetrically arranged on the outer side of the fixed lantern ring in the pile cap construction device, a lifting hole for a lifting rope to pass through is formed in the middle of each lifting lug, and the bottom of the lifting rope is bound and fixed on each lifting lug;

after the pile cap construction device is installed on the long spiral pile machine in the third step, the upper parts of the two lifting ropes are fixed on the power head of the long spiral pile machine, so that the pile cap construction device is lifted below the power head through the two lifting ropes;

before the pile cap forming hole is drilled in the fourth step, the pile cap construction device and the drill rod are synchronously lowered until the bottom of the drill cylinder is supported on the ground;

and fifthly, before the drilling rod continues to drill from top to bottom, detaching the upper parts of the two lifting ropes from the power head so as to disconnect the connection between the pile cap construction device and the power head.

The drilling and pouring pile body and pile cap integrated drilling pore-forming method is characterized in that: in the first step, a soil outlet is formed in the middle of the drilling barrel and is positioned above the spiral drill.

The drilling and pouring pile body and pile cap integrated drilling pore-forming method is characterized in that: in the step one, the height of the spiral drill cutter is the same as that of the pile cap.

Compared with the prior art, the invention has the following advantages:

1. the adopted pile cap construction device has the advantages of simple structure, reasonable design, simple and convenient installation and use operation and lower investment cost.

2. The adopted pile cap construction device is driven by the existing long screw pile machine to rotate and move up and down, no power equipment needs to be added, the equipment investment cost can be effectively saved, the pile cap construction device can be synchronously carried out with a drill rod, the synchronism and stability of the drilling process are ensured, and the pile forming quality can be effectively ensured.

3. The change to current long screw pile machine is little, only need on long screw pile machine installation pile cap construction equipment alright obtain CFG pile cap and pile body integration construction equipment, through carrying out simple and convenient transformation to long screw drill, increase pile cap drill bit and guider (being the drill bit leading truck), need not to increase in addition power, can satisfy the integration construction of plain concrete pile cap and pile body.

4. The construction method is simple and strong in practicability, the pile cap construction does not have a pile periphery soil excavation backfilling process, the pile cap and the pile body forming hole are drilled into a hole at one time, then concrete is integrally poured, and the pile head is simply and quickly cleaned; and the operability is strong, the pile cap part is drilled to the designed position, the lower pile body is drilled after the pin shaft between the pile cap drill bit and the drilling machine is removed, the pile periphery earthwork excavation backfill process is omitted, and the loose concrete of the pile head is cleaned before the cushion layer construction.

5. The environment protection effect is good, the pile surrounding earthwork excavation and backfilling tamping processes are avoided, and the waste of concrete is reduced compared with the pile cutting head when the pile head concrete is cleaned; meanwhile, the equipment is easy to modify, and the method has the environmental benefits of reducing water and soil loss, saving energy consumption and the like.

6. The cost can be reduced practically, the construction period is shortened, the construction process of the cast-in-situ bored pile is simplified, the pile cap and the pile body are changed into one-step drilling forming by means of separate drilling construction, and the construction efficiency is improved; the pile head cleaning loose concrete has the advantages that the pile head cleaning loose concrete has obviously reduced cost compared with a pile head cutting process in the pile head excavation and backfilling and tamping processes without pile periphery soil, the construction period can be effectively saved, and the cost is obviously reduced; meanwhile, the construction process is safe and reliable, the construction quality is controllable, the pile cap and the pile body can be formed at one time, and the concrete connection quality between the pile cap and the pile body is ensured. The invention is not only suitable for the one-step molding of the circular concrete pile cap and the pile body of the cast-in-situ bored pile, but also can be used after the square concrete pile cap is changed into the circular pile cap. The method can also be used for the construction of the reducing cast-in-place bored pile, and can also be used for removing the drilling slag in time after the pile is formed and inserting the reinforcing steel bar into the center of the pile in order to better increase the connection between the pile cap and the pile body. Therefore, the method has wide popularization and application prospect and obvious economic benefit and social benefit.

In conclusion, the method has the advantages of simple steps, reasonable design, simple and convenient construction and good use effect, the pile cap construction device is formed by additionally arranging the pile cap drill bit and the drill bit guide frame on the long screw pile machine, the pile cap construction device is driven by the drill rod of the long screw pile machine to rotate to complete the drilling of the pile cap forming hole, no power equipment is required to be additionally arranged, and the integrated drilling and hole forming construction of the pile cap and the pile body can be realized.

The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.

Drawings

FIG. 1 is a block diagram of the process flow of the present invention.

Fig. 2 is a schematic structural view of the pile cap construction apparatus of the present invention.

Fig. 3 is a schematic view of the construction of the helmet bit of the present invention.

Fig. 4 is a schematic plan view of the drill guide of the present invention.

Fig. 5 is a schematic elevation view of the drill guide of the present invention.

Fig. 6 is a schematic view showing a construction state after the installation of the pile cap construction device of the present invention is completed.

Fig. 7 is a schematic view of the construction state of the present invention when drilling the pile body forming hole.

Fig. 8 is a schematic view of the construction state of the present invention when drilling a pile cap forming hole.

FIG. 9 is a reference view showing the use state of the power transmission member and the rotary driving member of the present invention.

Fig. 10 is a schematic structural view of a cast-in-situ bored pile constructed according to the present invention.

Description of reference numerals:

1-a drill guide frame; 2-pile cap drill bit; 3, clamping and mounting;

4-fixing a lantern ring; 5, clamping a groove; 6, drilling a barrel;

7, a spiral drill; 8, a soil outlet; 9-a first connecting plate;

10-a second connecting plate; 11-vertical stop block; 12-horizontal pin shaft;

13, lifting lugs; 14-hanging holes; 15-long screw pile machine;

15-1-drill pipe; 15-2-upright; 15-3-power head;

16-pile body; 17-pile cap; 18-a stop collar;

19-a power transmission member; 20 — a rotary pusher; 21-pile cap forming holes;

22-pile body forming holes; and 23, hanging ropes.

Detailed Description

As shown in fig. 1, the method for drilling and pouring the pile body and the pile cap into the hole integrally comprises the steps that the constructed cast-in-situ bored pile comprises a pile body 16 and a pile cap 17 coaxially arranged at the upper part of the pile body 16, the pile body 16 and the pile cap 17 are connected into a whole, the cross sections of the pile body 16 and the pile cap 17 are both circular, and the pile cap 17 and the pile body 16 are both vertically arranged; the diameters of the pile bodies 16 are the same from bottom to top, and are shown in detail in fig. 10;

step one, processing a pile cap construction device: processing the pile cap construction device according to the diameters of a pile body 16 and a pile cap 17 in the constructed cast-in-situ bored pile and the height of the pile cap 17;

as shown in fig. 2 and 6, the pile cap construction device comprises a pile cap drill bit 2 for performing pore-forming construction on a pile cap 17 of a constructed cast-in-situ bored pile and a drill guide frame 1 for guiding the pile cap drill bit 2, wherein the drill guide frame 1 is installed on the pile cap drill bit 2, the pile cap drill bit 2 is vertically arranged, and the drill guide frame 1 is horizontally arranged;

as shown in fig. 3, the pile cap drill 2 comprises a drill barrel 6 and a spiral drill 7 arranged on the outer side wall of the lower part from top to bottom along the circumferential direction of the drill barrel 6, the drill barrel 6 is a cylindrical steel sleeve coaxially sleeved on a drill rod 15-1 of a long spiral pile driver 15 from bottom to top and driven by the drill rod 15-1 to synchronously rotate, a rotary pushing mechanism for pushing the drill barrel 6 to synchronously rotate is arranged on the drill rod 15-1, and the vertical distance between the rotary pushing mechanism and the bottom end of the drill rod 15-1 is not more than the height of the drill barrel 6; the spiral drill cutter 7 is a spiral blade and the height of the spiral drill cutter is not less than that of the pile cap 17;

the pile cap 17 is a cylindrical pile cap or a conical pile cap, and the spiral drill 7 is a cylindrical drill for drilling a pile cap forming hole 21 of the cylindrical pile cap or a conical drill for drilling a pile cap forming hole 21 of the conical pile cap;

as shown in fig. 10, the diameters of the cylindrical pile caps are the same from bottom to top, and the diameter of the cylindrical pile cap is larger than that of the pile body 16; the outer diameter of the cylindrical drill cutter is the same from bottom to top, the outer diameter of the cylindrical drill cutter is the same as the diameter of the cylindrical pile cap, and the width of the cylindrical drill cutter is the same from bottom to top.

The diameter of the cone frustum-shaped pile cap is gradually increased from bottom to top, and the diameter of the bottom of the cone frustum-shaped pile cap is the same as that of the pile body 16; the outer diameter of the cone frustum-shaped drill is gradually increased from bottom to top, the outer diameter of the bottom of the cone frustum-shaped drill is the same as the diameter of the pile body 16, and the width of the cone frustum-shaped drill is gradually increased from bottom to top;

as shown in fig. 4 and 5, the drill guide frame 1 includes a fixed lantern ring 4 coaxially sleeved on the drill cylinder 6 and a lantern ring fixing member for mounting the fixed lantern ring 4 on the pile frame of the long spiral pile driver 15, the fixed lantern ring 4 and the lantern ring fixing member are both horizontally arranged, one end of the lantern ring fixing member is connected with the fixed lantern ring 4, and the other end of the lantern ring fixing member is connected with the pile frame;

step two, positioning a drilling machine: moving the long spiral pile machine 15 to a construction area of the constructed cast-in-situ bored pile, and enabling the drill rod 15-1 to be positioned right above the pile position of the constructed cast-in-situ bored pile;

step three, installing a pile cap construction device: installing a pile cap construction device on the long spiral pile machine 15 which is moved in place in the step two;

when the pile cap construction device is installed, the drill cylinder 6 is coaxially sleeved on the lower part of the drill rod 15-1 from bottom to top, and the bottom of the drill cylinder 6 is flush with the bottom of the drill rod 15-1; meanwhile, the lantern ring fixing piece of the drill guide frame 1 is connected with the pile frame of the long spiral pile driver 15;

drilling a pile cap forming hole: drilling by adopting a drill rod 15-1 from top to bottom, and pushing a pile cap drill bit 2 to synchronously drill from top to bottom by a rotary pushing mechanism on the drill rod 15-1 in the drilling process to obtain a pile cap forming hole 21 formed by construction, which is shown in detail in figure 7;

in the step, the drill rod 15-1 and the pile cap construction device form a pile cap drilling pore-forming device;

step five, drilling a pile body forming hole: and (3) disconnecting the drill rod 15-1 from the pile cap drill bit 2, and continuously drilling from top to bottom by using the drill rod 15-1 to obtain a pile body forming hole 22 formed by construction, which is shown in detail in fig. 8.

During the in-service use, guide to boring a section of thick bamboo 6 through fixed lantern ring 4, guarantee to bore the in-process to pile cap shaping hole 21, bore a section of thick bamboo 6 (be pile cap drill bit 2) and can not take place radial movement, guarantee on the one hand that the hole site in pile cap shaping hole 21 is accurate, on the other hand can effectively ensure that the process of driling in pile cap shaping hole 21 can be simple and convenient, last, effectively go on.

In this embodiment, in the first step, the drill rod 15-1 includes a core rod and a threaded blade arranged on the outer side of the core rod from bottom to top, the core rod is a cylindrical rod, the spiral drill 7 is a threaded drill, and the threaded blade and the spiral drill 7 have the same thread direction.

The thread blade and the auger bit 7 are both single threads. Therefore, the pile cap drill 2 has a simple structure and is easy and convenient to machine and manufacture.

In this embodiment, the inner diameter of the drill cylinder 6 is larger than the outer diameter of the thread blade.

In this embodiment, the height of the fixing collar 4 is 0.8L to 1L, where L is the pitch of the thread blade. During the in-service use, for clearance fit between the fixed lantern ring 4 and the drill barrel 6, through prescribing a limit to the internal diameter and the height of the fixed lantern ring 4 respectively, make the fixed lantern ring 4 carry out the guide effect can be abundant, effectively exert to the drill barrel 6, reach simultaneously and can effectively protect the drill barrel 6 through the fixed lantern ring 4, increase the intensity of drill barrel 6 to further ensure the effect of creeping into.

The drill cylinder 6 is connected to the pile frame through the lantern ring fixing piece, the pile frame is used as an acting point for guiding the drill guide frame 1, any fixing facility does not need to be additionally arranged on a construction site, labor and time are saved, and the fixed connection is simple, convenient and reliable. At the same time, the drill barrel 6 is further limited by the lantern ring fixing piece.

In this embodiment, the pile cap 17 is the cylindrical pile cap with the same diameter from bottom to top, and correspondingly, the spiral drill 7 is the cylindrical drill.

In actual construction, the pile cap 17 may be the truncated cone-shaped pile cap. At this time, the spiral drill 7 is the cone frustum-shaped drill, and the pile cap drill 2 is a reducing drill. Thus, the cap bit 2 is very flexible to use.

In this embodiment, in the first step, the drill guide frame 1 is a movable guide frame that can vertically move up and down along the pile frame and drive the pile cap drill 2 to synchronously move up and down.

In this way, the drill guide frame 1 does not affect the drilling process of the pile cap drill bit 2 and the drill rod 15-1. On one hand, the drill guide frame 1 cannot cause any influence on the axial rotation and the up-and-down movement of the drill rod 15-1, the pile cap construction device is installed on the long spiral pile driver 15, but cannot cause any influence on the normal construction process of the long spiral pile driver 15, and the long spiral pile driver 15 is constructed according to a conventional construction method. On the other hand, the drill guide frame 1 can move up and down along with the pile cap drill 2 synchronously, so that the drill guide frame 1 can guide and effectively protect the pile cap drill 2 (namely the drill cylinder 6) under any condition, and the drill guide frame 1 moves up and down along the pile frame, so that additional moving equipment is not needed, the cost can be effectively reduced, and the labor and the time are saved.

In the embodiment, the fixed lantern ring 4 is sleeved on the outer side of the upper part of the pile cap drill bit 2, and the spiral drill bit 7 is positioned below the fixed lantern ring 4; a lantern ring limiting part for limiting the fixed lantern ring 4 is arranged on the outer side wall of the upper part of the drill cylinder 6, the lantern ring limiting part comprises an upper limiting part and a lower limiting part which is positioned right below the upper limiting part, the upper limiting part and the lower limiting part are horizontally arranged and are fixed on the outer side wall of the upper part of the drill cylinder 6; the fixed lantern ring 4 is a cylindrical lantern ring clamped between the upper limiting piece and the lower limiting piece.

In this embodiment, the upper limiting member and the lower limiting member are both limiting rings 18.

In actual processing, other types of limiting mechanisms can be adopted as the upper limiting piece and the lower limiting piece.

According to the common knowledge in the field, the long spiral pile machine 15 comprises the pile frame and a drilling system, wherein the pile frame comprises an upright post 15-2 and a moving mechanism for driving the upright post 15-2 to move; the drilling system comprises a drilling tool and a power head 15-3 for driving the drilling tool, and a guide rail for enabling the power head 15-3 to move up and down is arranged on the upright post.

The guide rail is installed on the upright post 15-2, the moving mechanism is installed at the bottom of the upright post 15-2, the power head 15-3 is arranged on the hoisting structure and fixed on the upright post 15-2, and the power head 15-3 can move up and down along the guide rail. The power head 15-3 is a rotary driving and lifting device which drives the drill rod 15-1 to rotate and can drive the drill rod to move up and down.

In this embodiment, the lantern ring fixing piece includes a clamping piece 3 which is clamped on the guide rail and can move up and down along the guide rail, the fixing lantern ring 4 and the clamping piece 3 are connected and fixed through a connecting piece, and the clamping piece 3 and the connecting piece are arranged on the same horizontal plane.

The lantern ring fixing piece can be directly clamped on the guide rail through the clamping piece 3, the direct installation is simple and convenient, the connection is reliable, and during design and processing, the structure of the clamping piece 3 is determined only according to the structure of the guide rail, and the length of the connecting piece is determined according to the distance between the guide rail and the drill rod 15-1 and the outer diameter of the drill barrel 6. Like this, to long spiral stake machine 15 from the area the guide rail effectively utilizes, drill bit leading truck 1 utilizes the guide rail reciprocates, simple and practical.

In this embodiment, the drill barrel 6 is provided with a pushed member for pushing the rotary pushing mechanism.

In practical use, the rotary pushing mechanism can also be a pushing mechanism directly supported or clamped on the drill barrel 6. For simple pushing, the drill cylinder 6 may also be provided with a supporting mechanism for supporting the rotary pushing mechanism or a clamping member for clamping the rotary pushing mechanism.

In this embodiment, as shown in fig. 6 and 10, the pushed member includes a plurality of power transmission members 19 arranged at the top of the drill barrel 6 along the circumferential direction, the rotary pushing mechanism includes a plurality of rotary pushing members 20 arranged on the threaded blades and pushing the power transmission members 19, each power transmission member 19 is pushed by one rotary pushing member 20, and each rotary pushing member 20 is located at the rear side of the pushed power transmission member 19.

In actual use, the rotary pushing members 20 are pushing members which push the power transmission member 19 from back to front. Thus, a plurality of the rotary pushers 20 are arranged on the rear side of a plurality of the power transmission members 19 in the circumferential direction.

As shown in fig. 2 and 3, each power transmission member 19 includes a vertical stop 11 fixed on the outer side of the top of the drill barrel 6 and a horizontal pin 12 mounted on the vertical stop 11, and the vertical stop 11 is provided with a through hole for the horizontal pin 12 to be inserted into; the structure and the size of the horizontal pin shafts 12 are the same, the horizontal pin shafts 12 are distributed along the circumferential direction, and the central axes of the horizontal pin shafts are intersected with the central axis of the drill cylinder 6; the horizontal distance between the inner end of each horizontal pin shaft 12 and the central axis of the drill barrel 6 is larger than

Wherein d is the outer diameter of the core rod.

The power transmission members 19 and the rotary pushing members 20 are the same in number and have one-to-one correspondence in arrangement positions. During actual processing, the number and the arrangement positions of the power transmission member 19 and the rotary pushing member 20 can be respectively adjusted according to specific requirements.

In the embodiment, when the pile cap construction device is installed in the third step, horizontal pin shafts 12 are inserted into the vertical stop blocks 11 at the top of the drill cylinder 6, and the inserted horizontal pin shafts 12 are positioned at the front side of one rotary pushing piece 20;

and in the fifth step, when the connection between the drill rod 15-1 and the pile cap drill bit 2 is disconnected, pulling out the horizontal pin shafts 12 from the vertical stop blocks 11.

The horizontal pin 12 is a detachable connecting piece. In this embodiment, the outer ends of the horizontal pins 12 are inserted into the vertical stoppers 11, and the inner end of each horizontal pin 12 is clamped to the front side of the rotary pushing member 20 for pushing the horizontal pin.

In practical use, the inner end of the horizontal pin 12 may also be inserted into a rotary pushing member 20 for pushing the horizontal pin, and an insertion hole for inserting the horizontal pin 12 is formed in the rotary pushing member 20. In this way, the drill rod 15-1 is firmly connected with the drill barrel 6 through the rotary push members 20 and the power transmission members 19.

In the actual use process, when the rotary pushing mechanism is required to be in a pushing state, the drill rod 15-1 is connected with the pile cap drill bit 2 through the detachable connecting piece, and at the moment, the drill cylinder 6 is clamped at the outer side of the drill rod 15-1 or the drill cylinder 6 is fixedly connected with the drill rod 15-1 into a whole. When the connection between the drill rod 15-1 and the pile cap drill bit 2 is disconnected, the detachable connecting piece is only needed to be detached.

Because power transmission piece 19 comprises vertical dog 11 and horizontal round pin axle 12 of installing on vertical dog 11, therefore power transmission piece 19 is a detachable transmission piece, pulls out horizontal round pin axle 12 back from vertical dog 11, then power transmission piece 19 just can not play the power transmission effect again, and actual operation is simple and convenient, and the using-way is nimble.

In this embodiment, the rotary pushing member 20 is a fixed block welded and fixed on the threaded blade.

And, the fixed block is cylindrical steel block. In practical use, the fixing block can also be a block with other shapes, such as a cubic block.

In this embodiment, the vertical stoppers 11 are fixed on the upper limiting member, and the vertical stoppers 11 are arranged along the edge line of the upper limiting member.

The actual fixing is thus simple and the vertical stop 11 does not have any influence on the drilling process of the drill rod 15-1 and the drill drum 6 and on the guiding action of the drill guide 1.

In this embodiment, the plurality of power transmission members 19 are uniformly distributed on the same horizontal plane.

In this embodiment, the number of the power transmission member 19 and the number of the rotary pushing members 20 are two, two of the rotary pushing members 20 are both fixed to one of the threaded blades, the blades fixed to the rotary pushing members 20 are fixed blades, one of the rotary pushing members 20 is located at the upper portion of the fixed blade, and the other rotary pushing member 20 is located at the bottom of the fixed blade, so that after horizontal pins 12 are respectively inserted into the two vertical stoppers 11, two horizontal pins 12 are both inserted into the threaded blades, and the two horizontal pins 12 are respectively located at the upper and lower sides of the fixed blade, so that the two horizontal pins 12 push the power transmission member 19 to enable the pile cap drill bit 2 to synchronously rotate along with the drill rod 15-1, and the two horizontal pins 12 form an axial limiting mechanism for axially limiting the drill rod 15-1, therefore, the pile cap drill bit 2 and the drill rod 15-1 can be simply and quickly assembled into a whole, and meanwhile, the pile cap drill bit 2 can be ensured to continuously drill downwards, and the drilling process is ensured to be effectively and reliably carried out.

Meanwhile, the two horizontal pin shafts 12 and the vertical stop block 11 are combined for use, so that an axial limiting mechanism for axially limiting the drill guide frame 1 is formed, the drill guide frame 1 is prevented from moving up and down in the working process, and a fixing effect is achieved; the drill guide 1 and the pile cap drill 2 can be moved up and down in synchronization by the two horizontal pins 12.

In this embodiment, the bottom of the drill barrel 6 is flush with the bottom of the drill rod 15-1.

In the process of drilling the pile cap forming hole 21, the pile cap drill bit 2 and the drill rod 15-1 are drilled from top to bottom synchronously, so that the drilling speed can be effectively increased, and the drilling stability can be effectively increased.

During actual processing, the arrangement position of the rotary pushing piece 20 on the drill rod 15-1 is determined according to the height of the drill cylinder 6, so that the bottom of the drill cylinder 6 is flush with the bottom of the drill rod 15-1 after the pile cap construction device is installed in the step three.

In this embodiment, the height of the auger bit 7 is the same as the height of the pile cap 17.

In this embodiment, the clamping member 3 includes two jaws symmetrically clamped on the guide rail and located on the same horizontal plane, the jaws are horizontally arranged, clamping grooves 5 clamped on the guide rail are formed in the front sides of the jaws, and the rear ends of the jaws are fixed on the connecting member.

In this embodiment, the clip member 3 is circular and has a diameter of Φ 100mm, and the fixing collar 4 has an inner diameter of Φ 450mm and an outer diameter of Φ 560 mm.

During the in-service use, the fixed lantern ring 4 clamps on the 6 upper portions of a brill section of thick bamboo, drill bit leading truck 1 can not only reciprocate, and drill bit leading truck 1 also can wind the guide rail carries out the horizontal rotation simultaneously, and actual operation is very simple and convenient, uses in a flexible way, and the location is simple and convenient, can satisfy the drilling demand in different pile position stake holes.

In practical use, the processing materials of the drill cylinder 6 and the spiral drill bit 7 in the pile cap drill bit 2 are Q235, the yield value of the rigid material is reduced along with the increase of the thickness of the rigid material, and the rigid material has moderate carbon content, good comprehensive performance, good matching of strength, plasticity, welding and other performances in use and wide application.

During actual machining, the inner diameter of the drill cylinder 6 is determined according to the outer diameter of the drill rod 15-1 (namely the outer diameter of the threaded blade), and the inner diameter of the drill cylinder 6 is larger than the outer diameter of the drill rod 15-1; the diameter of the spiral drill bit 7 is determined according to the aperture of the pile cap forming hole 21, and the diameter of the spiral drill bit 7 is consistent with the aperture of the pile cap forming hole 21; the outer diameter of the drill rod 15-1 (i.e., the outer diameter of the threaded blade) is determined according to the diameter of the pile forming hole 22, and the outer diameter of the drill rod 15-1 (i.e., the outer diameter of the threaded blade) is consistent with the diameter of the pile forming hole 22.

In this embodiment, the height of the drill cylinder 6 is 2000mm, and the height of the drill guide frame 1 (i.e. the fixed collar 4) is 235 mm.

During actual processing, the heights of the drill cylinder 6 and the drill guide frame 1 (i.e. the fixed lantern ring 4) can be adjusted correspondingly according to specific requirements. The inner diameter of the drill barrel 6 is 20-50 mm larger than the outer diameter of the drill rod 15-1 (namely the outer diameter of the threaded blade).

In the embodiment, the diameter of the core rod is phi 200mm, the outer diameter of the drill rod 15-1 (namely the outer diameter of the threaded blade) is phi 400mm, the outer diameter of the drill barrel 6 is phi 445mm, the wall thickness of the drill barrel is 5 mm-10 mm, and the diameter of the spiral drill 7 is phi 800 mm.

In actual processing, the diameter of the core rod, the outer diameter of the drill rod 15-1 (i.e. the outer diameter of the threaded blade), the outer diameter and the wall thickness of the drill barrel 6 and the diameter of the spiral drill 7 can be adjusted correspondingly according to specific requirements.

In this embodiment, the diameter of the horizontal pin 12 is Φ 30 mm.

During actual processing, the diameter of the horizontal pin 12 can be adjusted according to specific requirements.

In this embodiment, the blade of the auger bit 7 is formed by processing a steel plate with a thickness of 15mm, and the vertical stopper 11 is a steel plate with a thickness of 30 mm. During actual processing, the thickness of the blade of the spiral drill 7 and the thickness of the vertical stop 11 can be adjusted correspondingly according to specific requirements.

In this embodiment, the left side and the right side of the fixed lantern ring 4 are symmetrically provided with lifting lugs 13, and the middle parts of the lifting lugs 13 are provided with lifting holes 14 for the lifting ropes to pass through.

In order to further determine the connection reliability and ensure that the pile cap construction device and the drill rod 15-1 can be synchronously lifted or lowered, when in actual use, the lifting lug 13 is connected with a lifting device (namely a power head 15-3) of the drill rod 15-1 through a steel wire rope (namely the lifting rope), and the vertical stop block 11, the horizontal pin shaft 12 and the lifting lug 13 are matched with each other, so that the relative movement of the drill guide frame 1 in the axial direction of the drill rod 15-1 is limited, and meanwhile, the power head 15-3 can drive the drill guide frame 1 to move up and down and correspondingly drive the pile cap drill 2 to move up and down synchronously. Therefore, the up-and-down moving process and the up-and-down moving direction of the pile cap drill bit 2 and the drill bit guide frame 1 are controlled by the power head 15-3, the implementation is simple and convenient, no additional driving equipment is needed, and the action is reliable.

In this embodiment, the connecting member includes a first connecting plate 9 and a second connecting plate 10 vertically arranged with the first connecting plate 9, the clamping member 3 is fastened and connected with the first connecting plate 9, the second connecting plate 10 is vertically arranged with the fixed lantern ring 4 and horizontally arranged, the first connecting plate 9 is fastened and connected with the fixed lantern ring 4 through the second connecting plate 10, the clamping member 3 is fastened and connected with the second connecting plate 10 through the first connecting plate 9, and the clamping member 3 is fixed on the first connecting plate 9 through a bolt.

In actual use, the first connecting plate 9 and the second connecting plate 10 are fixedly connected through a reinforcing plate.

In this embodiment, the middle of the drilling barrel 6 is provided with a soil outlet 8, and the soil outlet 8 is located above the spiral drill 7. And the soil outlet 8 is positioned between the fixed lantern ring 4 and the auger bit 7.

In this embodiment, the number of the soil outlets 8 is two, and two the soil outlets 8 include the front soil outlet arranged on the front side of the middle of the drilling barrel 6 and the rear soil outlet arranged on the rear side of the middle of the drilling barrel 6, and the height of the front soil outlet is higher than that of the rear soil outlet, that is, the front soil outlet and the rear soil outlet are asymmetrically arranged, so that the soil outlets on the front side and the rear side of the pile cap drill bit 2 are not affected by each other.

During practical use, the front soil outlet and the rear soil outlet are both square openings and have the same size. In this embodiment, the height of the soil outlet 8 is 250mm and the width thereof is 200mm, and during actual processing, the shape and size of the soil outlet 8 can be adjusted accordingly according to specific requirements.

In the embodiment, after the long spiral pile machine 15 is moved to the construction area of the constructed cast-in-situ bored pile in the second step, the drill rod 15-1 is lifted upwards, and the vertical distance between the bottom of the drill rod 15-1 and the ground is larger than the height of the drill barrel 6;

two lifting lugs 13 are symmetrically arranged on the outer side of the fixed lantern ring 4 in the pile cap construction device, a lifting hole 14 for a lifting rope 23 to pass through is formed in the middle of each lifting lug 13, and the bottom of each lifting rope 23 is bound and fixed on each lifting lug 13;

after the pile cap construction device is installed on the long spiral pile machine 15 in the third step, the upper parts of the two lifting ropes 23 are fixed on a power head 15-3 of the long spiral pile machine 15, so that the pile cap construction device is hung below the power head 15-3 through the two lifting ropes 23;

before the pile cap forming hole is drilled in the fourth step, the pile cap construction device and the drill rod 15-1 are synchronously lowered until the bottom of the drill cylinder 6 is supported on the ground;

before the drilling rod 15-1 is adopted to continue drilling from top to bottom in the fifth step, the upper parts of the two lifting ropes 23 are detached from the power head 15-3, so that the connection between the pile cap construction device and the power head 15-3 is disconnected.

In this embodiment, after the pile forming hole 22 is formed in the fifth step, the drill rod 15-1 is lifted upward until the drill rod 15-1 is lifted out of the pile cap forming hole 21, and the pile cap drill 2 is lifted out of the pile cap forming hole 21. The pile body forming hole 22 and the pile cap forming hole 21 form a pile hole of the constructed cast-in-situ bored pile.

During actual construction, the drill rod 15-1 and the pile cap drill bit 2 can be lifted out of the pile cap forming hole 21, and then concrete is poured into the drilled pile hole from bottom to top; the drill pipe 15-1 may also be used to pour concrete into the pile bore.

When the drill rod 15-1 is adopted to pour concrete into the pile hole, after the pile cap forming hole 21 is formed, the drill rod 15-1 is lifted upwards until the bottom of the drill rod 15-1 is level with the bottom of the pile cap forming hole 21; in the upward lifting process, grouting equipment is adopted, concrete is synchronously poured into the pile body forming hole 22 from bottom to top through the drill rod 15-1, the concrete pouring construction process of the pile body 16 is completed, and the grouting equipment is connected with the upper end of the drill rod 15-1 through a grouting pipeline;

after the concrete pouring construction process of the pile body 16 is finished, the drill rod 15-1 is continuously lifted upwards until the drill rod 15-1 is lifted out of the pile cap forming hole 21; and in the upward lifting process, the grouting equipment is adopted, concrete is synchronously poured into the pile cap forming hole 21 from bottom to top through the drill rod 15-1, the concrete pouring construction process of the pile cap 17 is completed, and after the poured concrete is finally set, the cast-in-situ bored pile formed by construction is obtained.

During actual construction, before concrete is poured into the pile cap forming hole 21 by adopting the drill rod 15-1, the pile cap construction device is lifted out of the pile cap forming hole 21 from bottom to top; or the pile cap construction device and the drill rod 15-1 are lifted from bottom to top synchronously in the process of pouring concrete into the pile cap forming hole 21 from bottom to top synchronously.

From the above, the invention modifies the conventionally used long screw pile machine 15, specifically, the cap drill 2 and the drill guide frame 1 in the cap construction device are processed according to the size of the cap forming hole 21, and by combining the outer diameter of the drill rod 15-1 and the distance between the drill rod 15-1 and the guide rail. And then installing the processed pile cap construction device on a long spiral pile machine 15, during actual installation, firstly lifting the drill rod 15-1 upwards until the vertical distance from the bottom of the drill rod 15-1 to the ground is greater than the height of the drill barrel 6, then hoisting the pile cap construction device to the position right below the drill rod 15-1 by adopting hoisting equipment, clamping the drill bit guide frame 1 on the guide rail (also called a slide rail, namely a round steel pipe at two sides of the pile frame) through the clamping part 3, temporarily installing the pile cap drill bit on the drill rod 15-1 by matching the rotary pushing part 20 with the power transmission part 19, and simultaneously connecting the drill bit guide frame 1 with the power head 15-3 through a lifting rope.

During actual construction, after the horizontal bolt 12 is inserted into the vertical stop block 11, the long spiral pile machine 15 can synchronously drive the pile cap drill bit 2 to drill from top to bottom while drilling; after the pile is drilled to the designed elevation of the bottom of the pile cap 17, the horizontal bolt 12 is pulled out, and the long spiral pile driver 15 continues to drill to the designed elevation of the bottom of the pile body 16; then, controlling the long screw pile driver 15 (namely the drill rod 15-1) to rotate reversely, lifting the drill rod 15-1 upwards at a constant speed, and synchronously pouring concrete to the designed elevation of the bottom of the pile cap 17 in the process of lifting the drill rod 15-1 upwards at a constant speed; then, as the diameter of the pile is increased, the lifting speed of the drill rod 15-1 is reduced, the drill rod 15-1 and the pile cap construction device are lifted upwards synchronously at a constant speed, and the one-time construction process of the pile cap and the pile body is completed; and finally, removing the drilling slag in time and cleaning the equipment.

For simple installation, when the pile cap construction device is installed, the clamping piece 3 is firstly detached from the connecting piece, then the clamping piece 3 is hoisted by adopting hoisting equipment (such as a hoist and the like) and aligned with the guide rail until the clamping piece 3 is clamped on the guide rail, and the installation process of the clamping piece 3 is completed. Then, hoisting the pile cap construction device with the clamping part 3 removed to the position below the drill rod 15-1 by using a hoisting device (such as a truck crane or an excavator), and enabling the drill cylinder 6 to be positioned right below the drill rod 15-1; then, a drill rod 15-1 is lowered down or the pile cap construction device with the clamping piece 3 removed is lifted vertically upwards, a drill cylinder 6 is sleeved on the drill rod 15-1, and meanwhile, the connecting piece in the pile cap construction device is tightly connected with the clamping piece 3 which is installed in advance, so that the installation process of the pile cap construction device is completed.

In this embodiment, for simple installation, the fixing collar 4 may also be formed by two symmetrically arranged semicircular rings that are buckled with each other. In actual installation, the two semicircular rings are sleeved on the upper part of the drill barrel 6 and are tightly connected to form the fixed ring 4.

In order to facilitate the pile cap drill bit 2 to be lifted and rotated smoothly, grease is smeared on the tower slide rail (namely the guide rail) and the inner wall of the fixed sleeve ring 4, and the grease is timely coated in the construction process.

In order to avoid the horizontal pin 12 from falling or losing, the horizontal pin 12 is connected to the pile cap drill 2 (specifically, the drill barrel 6) by a thin steel wire rope, and the horizontal pin 12 can be conveniently assembled and disassembled. In this embodiment, the horizontal pin 12 is made of 45 # steel.

And in the second step, before the drilling machine is in place, the pile position of the constructed cast-in-situ bored pile is subjected to paying-off measurement. The measured pile position is marked by adopting a wood pile, a bamboo sheet pile or point lime. After the drilling machine is in place, the plumb of the drill rod 15-1 is adjusted through correcting the hammer balls on the two sides of the drilling machine, and in order to accurately control the depth of the constructed cast-in-situ bored pile, a depth control scale is made on a pile frame and comprises a control mark at the bottom of a pile cap 17.

In this embodiment, the horizontal pin 12 is not inserted when the pile cap construction device is installed in step three.

In the fourth step, when the pile cap forming hole is drilled, after the bottom of the drilling barrel 6 is contacted with the ground and the horizontal pin shaft 12 is inserted, the power head 15-3 is started, the long spiral pile machine 15 rotates forwards slowly and drives the pile cap drill bit 2 to drill and discharge soil in a rotating mode, the shaking of the drill rod 15-1 is reduced, and hole deviation is prevented.

When the drilling is carried out until the designed elevation of the bottom of the pile cap 17 is reached, the power head 15-3 is closed, and the horizontal pin shaft 12 is pulled out; and then, the power head 15-3 continues to drill and discharge soil to the designed elevation design elevation of the bottom of the pile body 16. And in the drilling process, determining a holding force value according to the current value determined by the test pile, and slowing down the drilling when the drilling process shakes too much.

After the construction is finished, the long screw pile machine 15 is shifted to the construction position of the next pile for construction, and due to the influence of site personnel, pipelines and the dumping of the upper pile, the pile position is rechecked before the construction of the lower pile.

In order to avoid pile breakage caused by cleaning of drilling slag after initial setting of concrete of the pile body 16, a digging machine and 1-2 soil transporting vehicles are configured on site, and the drilling slag is cleaned in time and transported to a waste soil yard to be stacked.

After the concrete of the pile body 16 reaches 28d age, manually cleaning loose soil on the top surface of the pile cap and the like, and cleaning the loose concrete on the top surface of the pile by adopting an electric hammer. A small excavator is used for leveling the construction site, a crawler belt of the excavator walks along the center of the pile, and the pile body is strictly forbidden to touch during leveling. And after the field is leveled, a small-sized tamper is adopted to tamp and level the soil around the pile.

When the temperature reaches the conditions of winter construction, the construction should be handled according to winter construction, measures are taken to prevent the concrete from being frozen before initial setting, and part of drilling slag should be left to cover the top surface of the pile foundation for covering and heat preservation when the drilling slag is cleaned.

During actual construction, when the drill rod 15-1 drills to the designed elevation or the holding layer at the bottom of the pile body 16, concrete is pumped into a drill rod core pipe (namely the core rod), air in the drill rod core pipe (namely the core rod) is exhausted from an exhaust valve, and after the drill rod core pipe and the delivery pipe are filled with concrete and are continuous, the drill rod is lifted in time (namely the drill rod 15-1 is lifted), so that the concrete is poured into the pile under certain pressure. In order to avoid the problem that the pile body forms a cavity because air in the drill rod core pipe cannot be discharged, whether the exhaust valve is blocked or not is often checked during construction, and measures are taken to clean the pile body in time if the exhaust valve is blocked. Thus, the upper end of the drill rod 15-1 is provided with an exhaust pipe, and the exhaust pipe is provided with an exhaust valve.

In this embodiment, the bored pile to be constructed is a CFG pile, which is also called a cement fly ash gravel pile, and is a variable-strength pile with a certain strength, which is made by mixing gravel, stone chips, sand, fly ash, cement and water into slurry and using various pile-forming machines.

During actual construction, the constructed cast-in-situ bored pile can be other types of bored piles.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A drilling and pouring pile body and pile cap integrated drilling hole forming method is characterized in that: the constructed cast-in-situ bored pile comprises a pile body (16) and a pile cap (17) coaxially arranged at the upper part of the pile body (16), wherein the pile body (16) and the pile cap (17) are connected into a whole, the cross sections of the pile body and the pile cap are circular, and the pile cap (17) and the pile body (16) are vertically arranged; the diameters of the pile bodies (16) are the same from bottom to top;

step one, processing a pile cap construction device: processing the pile cap construction device according to the diameters of a pile body (16) and a pile cap (17) in the constructed cast-in-situ bored pile and the height of the pile cap (17);

the pile cap construction device comprises a pile cap drill bit (2) for performing pore-forming construction on a pile cap (17) of a constructed cast-in-situ bored pile and a drill bit guide frame (1) for guiding the pile cap drill bit (2), wherein the drill bit guide frame (1) is arranged on the pile cap drill bit (2), the pile cap drill bit (2) is vertically arranged, and the drill bit guide frame (1) is horizontally arranged;

the pile cap drill bit (2) comprises a drill barrel (6) and spiral drill cutters (7) arranged on the outer side wall of the lower part of the pile cap drill bit from top to bottom along the circumferential direction of the drill barrel (6), the drill barrel (6) is a cylindrical steel sleeve which is coaxially sleeved on a drill rod (15-1) of a long spiral pile machine (15) from bottom to top and is driven by the drill rod (15-1) to synchronously rotate, a rotary pushing mechanism for pushing the drill barrel (6) to synchronously rotate is arranged on the drill rod (15-1), and the vertical distance between the rotary pushing mechanism and the bottom end of the drill rod (15-1) is not more than the height of the drill barrel (6); the spiral drill cutter (7) is a spiral blade and the height of the spiral drill cutter is not less than that of the pile cap (17);

the pile cap (17) is a cylindrical pile cap or a conical pile cap, and the spiral drill (7) is a cylindrical drill for drilling a pile cap forming hole (21) of the cylindrical pile cap or a conical drill for drilling a pile cap forming hole (21) of the conical pile cap;

the diameters of the cylindrical pile caps are the same from bottom to top, and the diameters of the cylindrical pile caps are larger than that of the pile body (16); the outer diameter of the cylindrical drilling cutter is the same from bottom to top and is the same as the diameter of the cylindrical pile cap, and the width of the cylindrical drilling cutter is the same from bottom to top;

the diameter of the cone frustum-shaped pile cap is gradually increased from bottom to top, and the diameter of the bottom of the cone frustum-shaped pile cap is the same as that of the pile body (16); the outer diameter of the cone frustum-shaped drill is gradually increased from bottom to top, the outer diameter of the bottom of the cone frustum-shaped drill is the same as the diameter of the pile body (16), and the width of the cone frustum-shaped drill is gradually increased from bottom to top;

the drill guide frame (1) comprises a fixed lantern ring (4) coaxially sleeved on the drill cylinder (6) and a lantern ring fixing piece for installing the fixed lantern ring (4) on a pile frame of the long screw pile machine (15), the fixed lantern ring (4) and the lantern ring fixing piece are both horizontally arranged, one end of the lantern ring fixing piece is connected with the fixed lantern ring (4), and the other end of the lantern ring fixing piece is connected with the pile frame;

step two, positioning a drilling machine: moving the long screw pile driver (15) to a construction area of the constructed cast-in-situ bored pile, and enabling the drill rod (15-1) to be positioned right above the pile position of the constructed cast-in-situ bored pile;

step three, installing a pile cap construction device: installing a pile cap construction device on the long spiral pile machine (15) which is moved in place in the step two;

when the pile cap construction device is installed, the drill cylinder (6) is coaxially sleeved on the lower part of the drill rod (15-1) from bottom to top, and the bottom of the drill cylinder (6) is flush with the bottom of the drill rod (15-1); meanwhile, the lantern ring fixing piece of the drill guide frame (1) is connected with the pile frame of the long screw pile machine (15);

drilling a pile cap forming hole: drilling from top to bottom by adopting a drill rod (15-1), and in the drilling process, pushing a pile cap drill bit (2) to synchronously drill from top to bottom by a rotary pushing mechanism on the drill rod (15-1) to obtain a pile cap forming hole (21) formed by construction;

in the step, the drill rod (15-1) and the pile cap construction device form a pile cap drilling pore-forming device;

step five, drilling a pile body forming hole: disconnecting the drill rod (15-1) and the pile cap drill bit (2), and continuously drilling from top to bottom by adopting the drill rod (15-1) to obtain a pile body forming hole (22) for construction forming;

in the first step, the drill guide frame (1) is a movable guide frame which can vertically move up and down along the pile frame and drive the pile cap drill bit (2) to synchronously move up and down, the fixed sleeve ring (4) is sleeved on the outer side of the upper part of the pile cap drill bit (2), and the spiral drill cutter (7) is positioned below the fixed sleeve ring (4); the outer side wall of the upper part of the drill cylinder (6) is provided with a lantern ring limiting part for limiting the fixed lantern ring (4), the lantern ring limiting part comprises an upper limiting part and a lower limiting part which is positioned right below the upper limiting part, the upper limiting part and the lower limiting part are both horizontally arranged and are both fixed on the outer side wall of the upper part of the drill cylinder (6); the fixed lantern ring (4) is a cylindrical lantern ring clamped between the upper limiting piece and the lower limiting piece; the height of the fixed lantern ring (4) is 0.8L-1L, wherein L is the thread pitch of the thread blade;

in the first step, a soil outlet (8) is formed in the middle of the drilling barrel (6), and the soil outlet (8) is positioned above the spiral drill (7);

in the first step, the drill rod (15-1) comprises a core rod and a threaded blade arranged on the outer side of the core rod from bottom to top, the core rod is a cylindrical rod, the spiral drill (7) is a threaded drill, and the threaded blade and the spiral drill (7) have the same thread direction;

the drill barrel (6) is provided with a pushed piece for pushing the rotary pushing mechanism; the pushed part comprises a plurality of power transmission parts (19) which are distributed at the top of the drilling barrel (6) along the circumferential direction, the rotary pushing mechanism comprises a plurality of rotary pushing parts (20) which are distributed on the threaded blades and push the power transmission parts (19), each power transmission part (19) is pushed by one rotary pushing part (20), and each rotary pushing part (20) is positioned at the rear side of the pushed power transmission part (19);

the power transmission pieces (19) are uniformly distributed on the same horizontal plane; each power transmission part (19) comprises a vertical stop block (11) fixed on the outer side of the top of the drill cylinder (6) and a horizontal pin shaft (12) installed on the vertical stop block (11), and the vertical stop block (11) is provided with a through hole for the horizontal pin shaft (12) to be inserted into; the structure and the size of the horizontal pin shafts (12) are the same, the horizontal pin shafts (12) are distributed along the circumferential direction, and the central axes of the horizontal pin shafts are intersected with the central axis of the drill barrel (6); the horizontal distance between the inner end of each horizontal pin shaft (12) and the central axis of the drill cylinder (6) is larger than

Wherein d is the outer diameter of the core rod;

when the pile cap construction device is installed in the third step, horizontal pin shafts (12) are inserted into all vertical stop blocks (11) at the top of the drill cylinder (6), and the inserted horizontal pin shafts (12) are positioned on the front side of one rotary pushing piece (20);

when the connection between the drill rod (15-1) and the pile cap drill bit (2) is disconnected in the fifth step, the horizontal pin shafts (12) are pulled out from the vertical stop block (11);

moving the long screw pile driver (15) to a construction area of a constructed cast-in-situ bored pile, lifting the drill rod (15-1) upwards, and enabling the vertical distance between the bottom of the drill rod (15-1) and the ground to be larger than the height of the drill cylinder (6);

two lifting lugs (13) are symmetrically arranged on the outer side of the fixed lantern ring (4) in the pile cap construction device, a lifting hole (14) for a lifting rope (23) to pass through is formed in the middle of each lifting lug (13), and the bottom of each lifting rope (23) is bound and fixed on each lifting lug (13);

after the pile cap construction device is installed on the long spiral pile machine (15) in the third step, the upper parts of the two lifting ropes (23) are fixed on a power head (15-3) of the long spiral pile machine (15), so that the pile cap construction device is lifted below the power head (15-3) through the two lifting ropes (23);

before the pile cap forming hole is drilled in the fourth step, the pile cap construction device and a drill rod (15-1) are synchronously lowered until the bottom of a drill cylinder (6) is supported on the ground;

before the drilling rod (15-1) is adopted to continue to drill from top to bottom in the fifth step, the upper parts of the two lifting ropes (23) are detached from the power head (15-3) so as to disconnect the connection between the pile cap construction device and the power head (15-3);

an exhaust pipe is arranged at the upper end of the drill rod (15-1), and an exhaust valve is arranged on the exhaust pipe.

2. The method for integrally drilling and forming the hole of the bored pile body and the pile cap according to claim 1, characterized in that: and fifthly, after the pile body forming hole (22) is formed, the drill rod (15-1) is lifted upwards until the drill rod (15-1) is lifted out of the pile cap forming hole (21), and meanwhile, the pile cap drill bit (2) is lifted out of the pile cap forming hole (21).

3. The method for integrally drilling and forming the hole of the bored pile body and the pile cap according to claim 1, characterized in that: the long screw pile driver (15) comprises the pile frame and a drilling system, wherein the pile frame comprises an upright post (15-2) and a moving mechanism for driving the upright post (15-2) to move; the drilling system comprises a drilling tool and a power head (15-3) for driving the drilling tool, and a guide rail for enabling the power head (15-3) to move up and down is arranged on the upright post;

the lantern ring fixing piece comprises a clamping piece (3) which is clamped on the guide rail and can move up and down along the guide rail, the fixed lantern ring (4) and the clamping piece (3) are fixedly connected through a connecting piece, and the clamping piece (3) and the connecting piece are arranged on the same horizontal plane.

4. The method for integrally drilling the hole of the cast-in-situ bored pile body and the pile cap according to claim 3, wherein: the clamping piece (3) comprises two clamping jaws which are symmetrically clamped on the guide rail and are positioned on the same horizontal plane, the clamping jaws are horizontally arranged, clamping grooves (5) clamped on the guide rail are formed in the front sides of the clamping jaws, and the rear ends of the clamping jaws are fixed on the connecting piece.

5. The method for integrally drilling and forming the hole of the pile body and the pile cap of the cast-in-situ bored pile according to claim 1 or 2, characterized in that: in the first step, the height of the spiral drill (7) is the same as that of the pile cap (17).