CN113445933A

CN113445933A - Combined pile drill rod, drilling tool and combined pile manufacturing method

Info

Publication number: CN113445933A
Application number: CN202110747393.2A
Authority: CN
Inventors: 宋义仲; 刘彬; 李建明; 米春荣; 程海涛; 崔洪涛; 常国瑞; 梁红军; 吕哲; 马越; 王淑文
Original assignee: Shandong Jianke Special Construction Engineering Technology Center Co ltd; Shandong Provincial Academy of Building Research
Current assignee: Shandong Jianke Special Construction Engineering Technology Center Co ltd; Shandong Provincial Academy of Building Research
Priority date: 2021-07-01
Filing date: 2021-07-01
Publication date: 2021-09-28

Abstract

The invention relates to a combined pile drill pipe, a drilling tool and a method for manufacturing a combined pile, belonging to the technical field of pile forming equipment. A plurality of rotary cutter groups are arranged at intervals in the length direction. The rotary knives in each rotary cutter group are distributed on the rod body in a circle. The rotary knives are connected to the rod body through the support seat and can rotate on the support seat. The first stopper and the second stopper, the rotating blade can contact the first stopper after the forward rotation to form an expanded state. In the expanded state, the rotation radius of the rotating blade is D1. After the rotating blade rotates in the reverse direction, it can contact the second stopper. The contact of the parts forms a shrinking state, and the rotating radius of the rotary knife in the shrinking state is D2, where D1>D2.

Description

Combined pile drill rod, drilling tool and combined pile manufacturing method

Technical Field

The invention belongs to the technical field of pile forming equipment, and particularly relates to a combined pile drill rod, a drilling tool and a combined pile manufacturing method.

Background

The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.

The cement-soil core-insert combined pile is formed by compounding a cement-soil pile formed by a high-pressure jet stirring method and a core pile implanted concentrically, and is widely applied at present. The cement-soil core-insert combined pile has the advantages of less slurry pollution, reliable pile forming quality, low manufacturing cost and the like, but the cement-soil core-insert combined pile is formed by compounding a cement-soil pile and a core pile, and the pile forming processes and the construction processes of two pile types forming the cement-soil core-insert combined pile are different, so that the difficulty of controlling the concentricity when the two pile types are combined is caused. In order to ensure that the concentricity of the cement-soil insert core combined pile and two construction procedures are well connected, an experienced construction team and a technician are required to be selected, the whole construction process is monitored, the problems occurring when the two pile types are combined are timely adjusted, the labor cost is increased to a certain extent, and the construction speed is slowed down.

Disclosure of Invention

Aiming at the technical problems in the prior art, the invention provides a combined pile drill rod, a drilling tool and a combined pile manufacturing method.

The embodiment of the invention provides a combined pile drill rod which comprises a rod body, wherein the end part of the rod body is connected with a drill bit, the drill bit is provided with a liquid outlet, a plurality of rotary cutter sets are arranged at intervals in the length direction of the rod body, rotary cutters in each rotary cutter set are distributed on the rod body in a circumferential manner, the rotary cutters are connected to the rod body through a supporting seat and can rotate on the supporting seat, a first stopper and a second stopper are arranged on the supporting seat, the rotary cutters can be in contact with the first stopper to form an expansion state after rotating forward, the rotating radius of the rotary cutters is D1 in the expansion state, the rotary cutters can be in contact with the second stopper to form a contraction state after rotating backward, and the rotating radius of the rotary cutters is D2 in the contraction state, wherein D1 is larger than D2.

Further, the rotating knives in each rotating knife group are all on the same horizontal plane.

Furthermore, a square groove is formed in the edge of the supporting seat, the square groove is provided with a first side wall and a second side wall, the first side wall forms a first stopper, the second side wall forms a second stopper, and the rotary knife is rotatably arranged in the center of the square groove through a rotating shaft.

Further, the first blocking piece and the second blocking piece are welded and fixed on the upper surface of the supporting seat.

Further, the drilling rod is hollow, and a liquid outlet is arranged on the drill bit, and the liquid outlet is communicated with the inside of the drilling rod.

Further, the supporting seat is welded and fixed with the rod body.

The embodiment of the invention also provides a drilling tool which comprises the combined pile drill rod.

Further, the drill rod is connected with a grouting pump.

The embodiment of the invention also provides a manufacturing method of the combined pile, which adopts any one of the combined pile drill rods and comprises the following processes:

centering the drill rod in place at the pile position, and conveying cement slurry into the drill rod;

the drill rod is forwardly rotated to drill and sink, under the action of soil layer drilling reaction force, the rotary cutter is forwardly rotated and then is contacted with the first gear and fixed, and the diameter of the constructed peripheral cement-soil pile is kept unchanged at D1;

after the drilling rod is constructed to the pile bottom of the peripheral cement soil pile, the drilling rod is rotated reversely, under the action of soil layer drilling reaction force, the rotating cutter can be contacted with and fixed on the second baffle after rotating reversely, the equivalent diameter of the drilling rod is D2, wherein D1 is larger than D2, and meanwhile, a soil diagenetic agent is conveyed into the drilling rod;

and finally, continuously lifting the drill rod and removing the drill rod from the drill hole to finish the construction of the cement-soil hard core composite pile.

Further, after the drill pipe is removed from the drill hole, the manufactured cemented soil hard core composite pile is inserted into the reinforcement cage.

The invention has the following beneficial effects:

the combined pile drill provided by the invention is provided with a plurality of layers of rotary cutters, each layer of rotary cutter can rotate when stressed and is respectively contacted with the first blocking piece and the second blocking piece, and the rotary radiuses under the two states are different, so that when the drill rod is used for drilling, a peripheral cement soil pile can be injected into the drill rod when the drill rod rotates in the forward direction, and a soil diagenetic agent can be added when the drill rod rotates in the reverse direction, so that a cement soil core-inserted combined pile can be formed, the coaxiality is high, the problem of difficulty in controlling the concentricity of the cement soil core-inserted combined pile is solved, the drill rod only needs to be positioned once in the whole process, and the drill rod is used for drilling the pile, so that the process is simple, the pile forming speed is high, the in-situ stirring is free from slurry pollution, and the combined pile drill rod is environment-friendly and economical;

the method for preparing the combined pile has the advantages that the strength of the hard core with variable strength can be improved or reduced by adjusting the doping amount of the soil diagenesis agent on site, the strength change range is wide, the method can be applied to both composite foundation engineering and pile foundation engineering, and the application range is wide.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.

Fig. 1 is a structural diagram of a combined pile drill rod in an expanded state according to the embodiment;

fig. 2 is a structural diagram of a combined pile drill rod in a contraction state according to the embodiment;

FIG. 3 is a structural diagram of a rotary cutter in the combined pile drill rod provided by the embodiment;

FIG. 4 is a flow chart of the use of the combined pile drill rod provided by the embodiment;

fig. 5 is a flowchart illustrating the process of placing the combined pile drill rod into the reinforcement cage according to the embodiment;

fig. 6 is a structural view of an iso-core pile drilled by using a combined pile drill rod according to the embodiment;

fig. 7 is a structural view of a stub drilled using a combination pile drill rod according to the present embodiment.

In the figure: 1. the concrete pile comprises a peripheral cement-soil pile, 2 parts of a variable-strength hard core, 3 parts of a drill rod, 4 parts of a rotary cutter assembly, 5 parts of a drill bit, 6 parts of a supporting seat, 7 parts of a forward limiting plate, 8 parts of a reverse limiting plate, 9 parts of a rotating shaft, 10 parts of an outer cutter, 11 parts of a reinforcement cage.

Detailed Description

As shown in fig. 1-2, the embodiment of the present invention provides a drill rod specially used for a cemented soil hard core combined pile, the drill rod comprises a rod body 3, a plurality of groups of rotary cutter assemblies are arranged in the length direction of the rod body, wherein each group of rotary cutter assemblies 4 comprises three rotary cutters, the three rotary cutters are circumferentially distributed, the three rotary cutters are arranged on a horizontal plane, that is, each group of rotary cutters is distributed on the rod body in a layered manner, and the layer distance is 0.3 m-0.7 m.

The bottom of the rod body 3 is connected with a drill bit 5, the drill rod is hollow, a plurality of liquid outlets are formed in the drill bit and connected with a center hole of the drill rod, and therefore cement slurry can be injected into a drilled hole while drilling is achieved.

The drill bit 5 in this embodiment is screwed together, which facilitates the replacement of a new drill bit when a problem arises with the drill bit.

Referring to fig. 3, in the present embodiment, the rotary cutters 10 of each group of rotary cutters are connected to the rod body 3 through the supporting seat 6, a direction groove is formed in an edge of the supporting seat 6, the direction groove is provided with a side wall surface 7 and a bottom wall surface 8, wherein an end of the rotary cutter 10 is configured to be arc-shaped, and an end of the rotary cutter 10 is rotatably disposed at a center of the square groove through the rotating shaft 9, so that the rotary cutter can rotate in the square groove.

Since the drill rod 3 in this embodiment is rotatably drilled into the ground, the rotation of the drill rod can drive the rotary cutter to rotate, the rotary cutter 10 in this embodiment is rotatably disposed in the groove, when the rotary cutter is in a vertical state, the rotary cutter 10 is in contact with the left side wall surface 7, so that the minimum rotary radius of the drill rod is D2, when the rotary cutter is in a horizontal state, the rotary cutter 01 is in contact with the bottom wall surface 8, so that the rotary radius of the rotation is D1, wherein D1 is greater than D2, wherein (D1-D2) ≥ 200mm, so that when the drill rod rotates counterclockwise, if the rotary cutter 10 is subjected to resistance, the rotary cutters are in an open state, and if the rotary cutter 10 is subjected to resistance, the rotary cutters are in a retracted state.

Of course, in other embodiments, the direction groove may not be provided at the end of the supporting seat, a left baffle and a bottom baffle may be welded on the top of the end of the supporting seat, the two baffles are perpendicular to each other and are both fixed on the surface of the end of the supporting seat, and the rotary cutter may be provided in the area surrounded by the left baffle and the bottom baffle.

The supporting seat and the rod body in the embodiment are welded and fixed together, so that the connection strength of the supporting seat and the rod body is enhanced, and the stability of the rotating cutter in the rotating process is ensured.

Furthermore, the drill bit in the embodiment not only is provided with a liquid outlet on the existing drill bit, but also can be provided with a liquid outlet on the wall surface of the drill rod.

It should be noted that the left side wall surface and the bottom wall surface in the square groove in this embodiment are perpendicular to each other, but in other embodiments, they may not be perpendicular to each other, and thus, the diameter of the combined pile is determined according to the diameter of the combined pile, the diameter of the drill rod after counterclockwise rotation is determined according to the peripheral cement-soil pile of the combined pile, the distance from the tool tip of the rotating tool to the center of the rod body is determined according to the diameter of rotation, and then the angle of rotation to counterclockwise rotation is determined.

The following describes in detail a method for using a special drill rod for a cemented soil hard core combined pile combination provided based on the above embodiments, referring to fig. 1, fig. 2 and fig. 4, the method includes the following processes:

firstly, centering and positioning the drill rod at a pile position to ensure the perpendicularity of the drill rod and the surface of the pile position;

assuming that the anticlockwise rotation direction of the drill rod is a forward direction and the clockwise rotation direction is a reverse direction, the drill rod is rotated forward to drill and sink, cement slurry is conveyed into the drill rod, the cement slurry can flow into the drill hole along a liquid outlet on the drill bit and is mixed with soil in the drill hole, under the action of soil layer drilling reaction force, the rotary cutter can rotate clockwise and then is contacted with the bottom wall surface of the directional groove to realize fixation, at the moment, the rotary cutter is vertically in a horizontal state, so that the mixing of the cement slurry and the soil can be realized through the rotation of the rotary cutter, and the diameter of a constructed peripheral cement soil pile is kept unchanged at D1;

secondly, after the drilling rod is constructed to the bottom of a peripheral cement soil pile, the drilling rod rotates reversely, under the action of soil layer drilling reaction force, the rotary cutter can be attached to the side wall surface of the square groove after rotating anticlockwise to be limited and fixed, the rotary cutter is in a vertical state, the equivalent diameter of the drilling rod is D2, wherein D1 is larger than D2, and meanwhile, a soil diagenesis agent is conveyed into the drilling rod, so that a hard core can be formed in the peripheral cement soil shape, wherein the hard core is coaxial with the peripheral cement soil pile, and is formed by stirring and mixing soil, cement and the soil diagenesis agent.

And finally, continuously moving the special drill rod upwards and moving away from the drill hole, thus completing the construction of the cement-soil hard core combined pile.

It should be noted that, when the drill rod rotates reversely, the amount of cement mixed is the same as the amount of cement mixed when the drill rod rotates forwardly, but the strength of the hard core can be adjusted by changing the amount of the soil diagenetic agent mixed, and finally the strength of the hard core can reach 200% -6000% of the strength of the peripheral cement soil pile.

As shown in fig. 5-6, the combined pile manufactured by the method for manufacturing a combined pile provided by the embodiment has the same axis line of the variable-strength hard core 2 and the peripheral cement-soil pile 1, and the length of the variable-strength hard core is equal to the length of the peripheral cement-soil pile.

The combination manufactured by the manufacturing method provided by the embodiment can be used for both composite foundation engineering and pile foundation engineering, when the combination is used for the pile foundation engineering, the hard core can be inserted into the reinforcement cage by adopting the rear inserting method, as shown in fig. 7, after the drill rod is lifted out of the drill hole, the reinforcement cage 11 is lifted, and then the drill rod is implanted into the hard core 2 with variable strength.

Therefore, the method for manufacturing the combined pile can realize the coaxial problem of the peripheral cement soil pile and the middle hard core, and simultaneously can improve or reduce the strength of the hard core by adjusting the infiltration amount of the soil diagenesis agent on site.

Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.

Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.

Claims

1. A combined pile drill rod comprises a rod body, the end of the rod body is connected with a drill bit, and the drill bit is provided with a liquid outlet, it is characterized in that, a plurality of rotary cutter groups are arranged at intervals in the length direction of the rod body, and each rotary cutter The rotary knives in the group are distributed in a circle on the rod body. The rotary knives are connected to the rod body through the support seat and can rotate on the support seat. The support seat is provided with a first stopper and a second stopper, and the rotary cutter rotates forward. After that, it can contact with the first stopper to form an expanded state. In the expanded state, the rotating radius of the rotary knife is D1. After the rotating knife rotates in reverse, it can contact the second stopper to form a contracted state. In the contracted state, the rotating radius of the rotating knife is D1. is D2, where D1>D2.

2 . The combined pile drill rod according to claim 1 , wherein the rotary cutters in each rotary cutter group are on the same horizontal plane. 3 .

3. A combined pile drill pipe according to claim 1, characterized in that, a square groove is provided at the edge of the support seat, and the square groove is provided with a first side wall and a second side wall, and the first side The wall forms a first stopper, the second side wall forms a second stopper, and the rotary knife is rotated and arranged in the center of the square groove through a rotating shaft.

4 . The combined pile drill pipe according to claim 1 , wherein the first stopper and the second stopper are welded and fixed on the upper surface of the support base. 5 .

5 . The combined pile drill pipe according to claim 1 , wherein the drill pipe is hollow, and the liquid outlet is communicated with the inside of the drill pipe. 6 .

6 . The combined pile drill rod according to claim 1 , wherein the support seat and the rod body are welded and fixed. 7 .

7. A drilling tool, characterized in that it comprises the combined pile drill pipe according to any one of claims 1-6.

8 . The drilling tool according to claim 8 , wherein the drill pipe is connected to a grouting pump. 9 .

9. a composite pile manufacturing method, is characterized in that, adopts a kind of composite pile drill pipe described in any one of claim 1-6, comprises following process:

centering the drill pipe at the pile position, and transporting cement slurry into the drill pipe;

The drill pipe is rotated forward to drill and sink. Under the action of the soil layer drilling reaction force, the rotary cutter contacts and fixes the first gear after forward rotation. At this time, the peripheral cement-soil pile under construction The diameter keeps D1 unchanged;

After the construction reaches the bottom of the peripheral cement-soil pile, the drill pipe is rotated in the reverse direction. Under the action of the drilling reaction force of the soil layer, the rotary knife can contact and fix the second gear after the reverse rotation. The equivalent diameter of the rod is D2, where D1>D2, and at the same time, the soil diagenetic agent is transported into the drill pipe;

Finally, the drill pipe is continuously raised and removed from the borehole to complete the construction of the cement-soil hard core composite pile.

10 . The method for manufacturing a composite pile according to claim 9 , wherein after the drill pipe is removed from the borehole, the fabricated cement-soil hard core composite pile is inserted into the reinforcement cage. 11 .