CN114215071B - SMW construction method pile supporting structure based on water-rich deep foundation pit and construction method thereof - Google Patents

Abstract

The application relates to a pile supporting structure based on an SMW construction method and a construction method thereof, wherein the main scheme is the pile supporting structure based on the SMW construction method and comprises a plurality of cement stirring piles which are sequentially and linearly overlapped, and each two cement stirring piles are correspondingly provided with an H-shaped steel; the H-shaped steel is provided with an unreeling type steel skeleton, and when the unreeling type steel skeleton is in an unreeling state, the unreeling type steel skeleton is located in a cement mixing pile between every two adjacent H-shaped steels. This application places a roll of formula steel skeleton through setting to effectively provide the reinforcement skeleton for the cement stirring stake that is located in the middle of, thereby make whole supporting construction have the advantage that the construction degree of difficulty is little and good structural strength concurrently.

Description

SMW construction method pile supporting structure based on water-rich deep foundation pit and construction method thereof

Technical Field

The application relates to the field of foundation pit supporting technology, in particular to an SMW construction method pile supporting structure based on a water-rich deep foundation pit and a construction method of the SMW construction method pile supporting structure.

Background

The SMW method pile is characterized in that a multi-shaft type drilling and digging stirrer is used for drilling and digging to a certain depth on site, cement series reinforcers are sprayed at a drill bit and are repeatedly mixed and stirred with foundation soil, overlapping construction is adopted among construction units, then H-shaped steel or steel plates are inserted into a cement soil mixture body before hardening to serve as stress reinforcement materials until cement is hardened, and a continuous, complete and seamless underground wall body with certain strength and rigidity is formed.

The SMW construction method pile has the advantages of reducing construction cost, enhancing enterprise competitiveness, being suitable for building a conservation-oriented society and developing the demand of circular economy, reducing pollution and the like.

The existing H-shaped steel is inserted in two modes, one mode is a close insertion mode, namely one pile position is correspondingly inserted into one H-shaped steel, and the other mode is an insertion-jumping mode, namely after one H-shaped steel is inserted, another H-shaped steel is inserted into an empty pile position.

In view of the above related technologies, the inventor believes that although the dense-insertion type pile can greatly improve the structural strength of the retaining wall formed by the pile in the SMW construction method, the number of H-shaped steel is large, and the construction difficulty is high; although the number of the H-shaped steel is small and the construction is simplified, the strength of the formed retaining wall structure is not as high as that of the closely-inserted retaining wall structure; therefore, an SMW-process pile which combines the advantages of the above two methods is urgently needed.

Disclosure of Invention

In order to give consideration to the advantages of low construction difficulty and good structural strength, the application provides a SMW construction method pile supporting structure based on a water-rich deep foundation pit and a construction method thereof.

The application provides a SMW worker method stake supporting construction based on rich water deep basal pit adopts following technical scheme:

a pile supporting structure based on an SMW construction method for a water-rich deep foundation pit comprises a plurality of cement mixing piles which are sequentially and linearly overlapped, wherein every two cement mixing piles are correspondingly provided with an H-shaped steel; the H-shaped steel is provided with an unreeling type steel skeleton, and when the unreeling type steel skeleton is in an unreeling state, the unreeling type steel skeleton is located in a cement mixing pile between every two adjacent H-shaped steels.

By adopting the technical scheme, under the condition of one-jump one-plug mode, the construction difficulty is effectively reduced, and the rolled steel skeleton is arranged to effectively provide a reinforcing skeleton for the cement mixing pile positioned in the middle, so that the integral supporting structure has the advantages of small construction difficulty and good structural strength; and the unwinding type steel skeleton in the winding state is of a winding structure, so that the unwinding type steel skeleton has less resistance in the process of inserting the cement mixing pile along with the H-shaped steel, and the H-shaped steel can be conveniently inserted.

Optionally, the unreeling type steel skeleton comprises a plurality of steel sheets, the steel sheets are arranged along the length direction of the H-shaped steel, the long side edges of the two adjacent steel sheets are hinged to each other, a first sleeve is fixed on the steel sheet at the head end of the unreeling type steel skeleton, a connecting rod is arranged on the steel sheet at the tail end of the unreeling type steel skeleton, the H-shaped steel is provided with an unreeling shaft along the length direction of the H-shaped steel, and the first sleeve is rotatably sleeved outside the unreeling shaft.

Through adopting above-mentioned technical scheme, after H shaped steel inserted the cement mixing stake, through driving the connecting rod to the tail end that drives the formula steel skeleton of unreeling moves towards adjacent H shaped steel direction, thereby unreels the formula steel skeleton of unreeling with the rolling state and is straight state.

Optionally, the number of the unreeling type steel frameworks of the H-shaped steel is two, and the two unreeling type steel frameworks are respectively in lap joint with the unreeling type steel frameworks close to the H-shaped steel on one side; when the tail ends of the two unreeling type steel frameworks are overlapped, the connecting rod of the unreeling type steel framework is connected with the adjacent part of the unreeling type steel framework through the connecting piece.

By adopting the technical scheme and the lap joint mode, the two unreeling type steel frameworks form a closed structure so as to effectively improve the blocking capability of the retaining wall structure; secondly, the mutual bearing capacity of adjacent H shaped steel can be improved to the looks overlap joint to improve holistic bearing side pressure ability.

Optionally, the front and the back of the unreeling type steel skeleton are both pasted with PTFE films.

By adopting the technical scheme, firstly, the PTFE film has low friction coefficient and can be used as an antifriction material so as to facilitate the later-stage extraction of the unreeling type steel skeleton; secondly, the PTFE film is matched with the unreeling type steel skeleton to form a water retaining structure, so that the water resistance of the retaining wall structure is improved.

Optionally, a second sleeve is fixed to the steel sheet at the tail end of the unreeling type steel skeleton, the connecting rod is rotatably connected with the second sleeve, a ratchet mechanism which only allows the connecting rod to rotate anticlockwise in the overlooking plane is arranged between the connecting rod and the second sleeve, the connecting piece comprises a plurality of convex claws fixed on the outer wall of the connecting rod, the length of each convex claw is larger than the thickness of the steel sheet, and when the tail ends of two unreeling type steel skeletons are lapped, each convex claw extends into a hinge gap formed between the long side edges of two adjacent steel sheets.

Through adopting the above-mentioned technical scheme, when two tail ends that unreel formula steel skeleton overlap joint mutually, anticlockwise rotation connecting rod, rotate with driving the convex claw, and the convex claw rotates and must touch the steel sheet surface of adjacent formula steel skeleton that unreels, and because unreel formula steel skeleton is articulated flexible structure, consequently this steel sheet dodges adaptability, go into the articulated clearance department between the adjacent steel sheet until the convex claw card, the connecting rod is the displacement once more this moment, tighten and unreel formula steel skeleton, thereby inject the convex claw position, thereby accomplish two connections of unreeling formula steel skeleton, thereby greatly improved the common atress ability of adjacent H shaped steel, thereby improve holistic bearing pressure ability.

Optionally, when the tail ends of the two steel frames are overlapped, the steel sheets of the two steel frames are parallel, and an included angle is formed between the parallel line of the steel sheets and the arrangement direction line of each cement mixing pile.

By adopting the technical scheme, when the retaining wall structure is subjected to lateral pressure of soil, the lateral pressure of the soil divides the inclined plane of the inclined unreeling type steel skeleton into two component forces, so that the lateral pressure bearing capacity of the unreeling type steel skeleton is improved in a phase-changing manner.

Optionally, a first notch is formed in the outer wall of the unreeling shaft, a plurality of second notches are formed in the inner peripheral wall of the first sleeve, the second notches are evenly distributed along the circumference of the first sleeve, a bayonet is formed by the first notch and any one of the second notches, and a clamping block is clamped in the bayonet.

Through adopting above-mentioned technical scheme, through the cooperation of fixture block and bayonet socket, can realize unreeling the spool and the relative fixed between the first sleeve to consolidate unreeling formula steel skeleton.

The application also provides a construction method of the SMW construction method pile supporting structure based on the water-rich deep foundation pit, which adopts the following technical scheme:

a construction method of an SMW construction method pile supporting structure based on a water-rich deep foundation pit comprises the following steps:

s1, preparing for construction;

s2, excavating a guide channel;

s3, constructing a cement mixing pile;

s4, H-shaped steel construction: inserting H-shaped steel into the corresponding cement mixing pile in a one-to-one insertion and jumping mode, then driving a connecting rod on an unreeling type steel skeleton on the H-shaped steel to move towards the direction of the adjacent H-shaped steel through unreeling equipment until the unreeling type steel skeleton is in a completely unreeling state, and connecting two unreeling type steel skeletons through connecting pieces;

and S5, constructing the crown beam.

Optionally, the unreeling device comprises a base and two hydraulic cylinders respectively corresponding to the unreeling type steel framework, the base is provided with a matching groove for downwards sleeving the upper end of the H-shaped steel, the hydraulic cylinders are horizontally arranged, the cylinder bodies of the hydraulic cylinders are provided with rotating shafts rotatably connected with the base, and the base is provided with a direction adjusting assembly for adjusting the direction of the hydraulic cylinders; the telescopic end of the hydraulic cylinder is fixed with a supporting rod, and the end part of the supporting rod is provided with a holding claw for holding the connecting rod.

Through adopting above-mentioned technical scheme, remove through hydraulic mode drive connecting rod, it is comparatively accurate and rapid to through transferring to the subassembly, adjust the flexible direction of pneumatic cylinder, in order to ensure that two unreel the direction of unreeling of formula steel skeleton and parallel, so that the follow-up connection of connecting piece is fixed.

Optionally, the direction adjusting assembly comprises a servo motor fixed on the base, a lead screw is arranged at the output end of the servo motor, a sliding block is connected to the lead screw in a threaded manner, the sliding block is connected with the base in a sliding manner, a round block is fixed on the sliding block, and the round block is connected with the cylinder body of the hydraulic cylinder in a sliding manner along the length direction of the hydraulic cylinder.

Through adopting above-mentioned technical scheme, through the screw drive to the position of accurate control slider, thereby carry out accurate adjustment to the cylinder body swing angle of pneumatic cylinder.

In summary, the present application includes at least one of the following beneficial technical effects:

the unreeling type steel skeleton is arranged to effectively provide a reinforcing skeleton for the cement mixing pile located in the middle, so that the integral supporting structure has the advantages of low construction difficulty and good structural strength;

through setting up the PTFE membrane, the pulling out of the formula steel skeleton that unreels of not only the later stage of being convenient for, PTFE membrane collocation unreels the formula steel skeleton in order to form water retaining structure moreover to improve retaining wall structure's waterproof nature.

Drawings

Fig. 1 is a schematic view of the overall structure of the SMW-method pile support structure of example 1.

Fig. 2 is a plan view of the SMW-method pile support structure according to embodiment 1, showing a positional relationship between H-section steel and an unreeled steel skeleton.

Fig. 3 is a schematic view of an overall structure of the unreeling type steel skeleton of embodiment 1.

Fig. 4 is a partially enlarged view of a point a in fig. 3.

Fig. 5 is a partially enlarged view at B in fig. 3.

Fig. 6 is a partially enlarged view at C in fig. 2.

Fig. 7 is a block flow chart of a construction method of the SMW-method pile support structure according to embodiment 1.

Fig. 8 is a schematic structural diagram of the unwinding apparatus in embodiment 1.

Fig. 9 is a schematic view of another view angle of the unwinding apparatus of embodiment 1.

Fig. 10 is a partial schematic view for showing the unreeling type steel skeleton according to embodiment 2.

Fig. 11 is a plan view of the unreeling shaft of embodiment 3.

Description of the reference numerals: 1. an unreeling type steel framework; 10. stirring the piles with cement; 11. a steel sheet; 111. a hinged lever; 112. a hinge sleeve; 12. a first sleeve; 121. a second notch; 122. a clamping block; 13. a second sleeve; 14. a connecting rod; 15. a ratchet mechanism; 16. a convex claw; 17. a PTFE membrane; 20. h-shaped steel; 201. a web; 202. an upper flange; 203. a lower flange; 204. unwinding the reel; 205. a first notch; 21. a base body; 211. a mating groove; 22. a hydraulic cylinder; 23. a rotating shaft; 221. a strut; 222. clamping a claw; 223. a chute; 30. a crown beam; 31. a servo motor; 32. a screw rod; 33. a slider; 34. a slide rail; 35. and (7) round blocks.

Detailed Description

The present application is described in further detail below with reference to figures 1-11.

Embodiment 1 of the application discloses an SMW worker method stake supporting construction based on rich water deep basal pit.

Referring to fig. 1, the SMW construction method pile supporting structure based on the water-rich deep foundation pit includes a plurality of cement mixing piles 10 which are linearly arranged, two adjacent cement mixing piles 10 are mutually overlapped, each two cement mixing piles 10 are correspondingly provided with one H-shaped steel 20, that is, the H-shaped steel 20 is vertically inserted into the cement mixing piles 10 in a jump-and-insert manner, and the exposed ends of the H-shaped steel 20 are reinforced and connected by a crown beam 30 which is formed by pouring concrete.

As shown in FIG. 2, the H-shaped steel 20 comprises a web 201 and an upper flange 202 and a lower flange 203 which are respectively connected to two sides of the web 201, unwinding shafts 204 are respectively fixed at an inner right angle between the web 201 and the upper flange 202 and an inner right angle between the web 201 and the lower flange 203, the unwinding shafts 204 are arranged along the length direction of the H-shaped steel 20, and the two unwinding shafts 204 are respectively located at two sides of the web 201.

As shown in fig. 3 and 4, the H-shaped steel 20 is provided with two unreeling type steel frames 1, and the unreeling type steel frames 1 are arranged in one-to-one correspondence with the unreeling shafts 204; the unreeling type steel skeleton 1 comprises a plurality of steel sheets 11, the steel sheets 11 are arranged along the length direction of the H-shaped steel 20, and the long side edges of two adjacent steel sheets 11 are hinged with each other, specifically, the long side edge of one steel sheet 11 is fixed with a hinged rod 111, the long side edge of the other steel sheet 11 is fixed with a hinged sleeve 112, and the hinged rod 111 and the hinged sleeve 112 are connected in a rotating manner along a vertical axis.

A first sleeve 12 is fixed on the steel sheet 11 at the head end of the unreeling type steel skeleton 1, and the first sleeve 12 is sleeved on the unreeling shaft 204 from the lower end of the unreeling shaft 204, namely, the unreeling shaft 204 can move upwards to be separated from the first sleeve 12; a second sleeve 13 is fixed on a steel sheet 11 at the tail end of the unreeling type steel skeleton 1, and a connecting rod 14 penetrates through the second sleeve 13 in a rotating mode.

When the H-shaped steel 20 is inserted into the cement mixing pile 10, the connecting rod 14 is driven to move linearly, so that the two opposite unreeling type steel frameworks 1 of the two adjacent H-shaped steel 20 are unreeled oppositely, the tail ends of the two unreeling type steel frameworks 1 are in parallel lap joint, and then the connecting rod 14 of the unreeling type steel framework 1 is connected with the adjacent parts of the two unreeling type steel frameworks 1 through the connecting piece, so that the two unreeling type steel frameworks 1 are connected and fixed, and the soil lateral pressure resistance of the integral retaining wall structure is improved.

As shown in fig. 5 and 6, a ratchet mechanism 15 is provided between the connecting rod 14 and the second sleeve 13, and the ratchet mechanism 15 is configured to allow the connecting rod 14 to rotate counterclockwise only in a top view; the connecting piece comprises a plurality of convex claws 16, each convex claw 16 is arranged at intervals along the length direction of the connecting rod 14, the length of each convex claw 16 is larger than the thickness of each steel sheet 11, and each convex claw 16 is used for being clamped into a hinge gap between every two adjacent steel sheets 11.

Embodiment 1 also discloses a construction method of a SMW-method pile support structure based on a water-rich deep foundation pit, as shown in fig. 7, including the steps of:

s1, construction preparation, which comprises the following steps:

s1.1, surveying construction conditions, geological conditions and surrounding environment conditions including transport routes of mechanical equipment and materials, construction sites, operation spaces and conditions of underground obstacles.

S1.2, leveling the field, removing hard objects and underground obstacles on the surface layer of the construction area of the mixing pile, pumping water when unfavorable geological conditions such as open shore, dark pond or low-lying land are met, dredging, backfilling plain soil and tamping in layers.

S1.3, releasing the outer contour line of the underground structure of the building, and then performing pile position lofting.

S2, excavating a guide channel: and excavating a guide ditch according to the axis of the stirring wall.

S3, constructing a cement mixing pile 10: and (3) adopting a triaxial cement mixing pile 10 machine, and constructing the cement mixing pile 10 by a sleeve-joint one-hole method.

The concrete cement dosage and the water cement ratio are determined by combining indexes such as soil conditions, mechanical properties and the like through field tests, and specifically, the cement strength grade is P.042.5 grade, when the soil conditions are cohesive soil, the cement is more than or equal to 360kg/m ^3, the bentonite is 0 to 5kg/m ^3, and the water cement ratio is 1.5 to 2.0; when the soil condition is sandy soil, the cement is more than or equal to 325kg/m ^3, the bentonite is 5 to 10kg/m ^3, and the water-cement ratio is 1.5 to 2.0; when the soil texture condition is gravelly sand, the cement is more than or equal to 290kg/m ^3, the bentonite is 5 to 15kg/m ^3, and the water cement ratio is 1.5 to 2.0.

The water-cement ratio is set to a small value on the premise that the H-shaped steel 20 can be inserted into place by means of self weight and necessary auxiliary equipment. In the case of particularly weak soil such as fill soil and mucky soil, and in the case of relatively hard sandy soil and gravel soil, the amount of cement used is suitably increased when the rate of penetration is relatively slow.

S4, construction of the H-shaped steel 20: the H-shaped steel 20 is subjected to antifriction treatment in advance, and the antifriction treatment is mainly realized by coating antifriction agents.

Installing the unwinding type steel skeleton 1: put a formula of book steel skeleton 1 and be the rolling form, then from up the cover to putting on the spool 204 down with first sleeve 12, through first sleeve 12 and the cooperation of cup jointing of putting spool 204 promptly to the completion is put a formula of book steel skeleton 1 and H shaped steel 20 and is connected, then through tying up the rope, in order to unreel formula steel skeleton 1 and to unreel the upper end of spool 204 and fix once more, take place with the condition that a formula of book steel skeleton 1 dropped downwards in the in-process that reduces to lift H shaped steel 20.

The H-shaped steel 20 is inserted into the corresponding cement mixing pile 10 by one-to-one insertion by the self weight of the H-shaped steel 20 or by a certain external force (pile-feeding hammer).

And then the connecting rod 14 on the unreeling type steel skeleton 1 on the H-shaped steel 20 is driven to move towards the direction of the adjacent H-shaped steel 20 by the unreeling device.

Specifically, as shown in fig. 8 and 9, the unwinding device includes a base 21 and two hydraulic cylinders 22 corresponding to the unwinding type steel frame 1, the base 21 is provided with a matching groove 211 for being sleeved into the upper end of the H-shaped steel 20, that is, the base 21 and the H-shaped steel 20 can be connected through the matching groove 211, the hydraulic cylinders 22 are horizontally arranged, the cylinder bodies of the hydraulic cylinders 22 are provided with vertically arranged rotating shafts 23, and the hydraulic cylinders 22 are rotatably connected with the base 21 through the rotating shafts 23.

Two supporting rods 221 are fixed at the telescopic end of the hydraulic cylinder 22, the supporting rods 221 are parallel to the telescopic direction of the hydraulic cylinder 22, holding claws 222 are fixed at the end portions of the supporting rods 221, the holding claws 222 are U-shaped, and the holding claws 222 are used for holding the upper portions of the connecting rods 14 in a surrounding mode.

The base body 21 is further provided with a direction adjusting component for adjusting the direction of the hydraulic cylinder 22 so as to ensure that the telescopic motion of the hydraulic cylinder 22 can drive two adjacent unreeling type steel frameworks 1 to be mutually in parallel lap joint; transfer to subassembly including being fixed in the servo motor 31 of pedestal 21 upper surface, servo motor 31's output shaft is fixed with lead screw 32, lead screw 32 has the contained angle with pneumatic cylinder 22's axis, lead screw 32 threaded connection has slider 33, pedestal 21 upper surface is equipped with slide rail 34, slider 33 slides with slide rail 34 and is connected, slider 33 upper portion is fixed with round block 35, the spout 223 has been seted up to the lower surface of the cylinder body of pneumatic cylinder 22, the spout 223 sets up along pneumatic cylinder 22 length direction, round block 35 slides with spout 223 and is connected.

The specific unreeling process is as follows: the stretching direction of the hydraulic cylinder 22 is preliminarily determined through the direction-adjusting component, then the stretching end of the hydraulic cylinder 22 stretches out slowly, the connecting rod 14 is driven to move towards the direction of the adjacent H-shaped steel 20 through the matching of the holding claw 222 and the connecting rod 14, the unreeling type steel skeleton 1 in the reeling state is gradually unreeled to be in a straight state, when the unreeling type steel skeleton 1 is close to be completely straight and tightened, the connecting rod 14 is rotated anticlockwise, the convex claw 16 is clamped into the hinging gap of the adjacent steel sheet 11, and then the hydraulic cylinder 22 continues to be used for completely straight and tightening the unreeling type steel skeleton 1.

S5, construction of the crown beam 30: the crown beam 30 is reinforced, and then concrete is poured to form the crown beam 30.

The implementation principle of the embodiment 1 is as follows: under the condition of jumping one and inserting one mode, effectively reduce the construction degree of difficulty, and place a formula steel skeleton 1 through setting to effectively provide the reinforcement skeleton for the cement mixing pile 10 that is located in the middle of, thereby make whole supporting construction have the advantage that the construction degree of difficulty is little and good structural strength concurrently.

In addition, the two unreeling type steel frameworks 1 form a closed structure by adopting a lap joint mode, so that the blocking capability of the retaining wall structure is effectively improved; secondly, the mutual overlapping can improve the common stress capacity of the adjacent H-shaped steel 20, thereby improving the overall bearing pressure capacity.

In embodiment 2, as shown in fig. 10, a PTFE film 17 is attached to both the front and back surfaces of the unreeling type steel skeleton 1, which is different from embodiment 1.

Firstly, the PTFE film 17 has a low friction coefficient and can be used as an antifriction material, so that the unreeling type steel skeleton 1 can be pulled out in the later period; secondly, the PTFE film 17 is matched with the unreeling type steel skeleton 1 to form a water retaining structure, so that the water resistance of the retaining wall structure is improved.

Embodiment 3 is different from embodiment 1 in that, as shown in fig. 11, a first notch 205 is formed in an outer wall of the unwinding shaft 204, a cross section of the first notch 205 is trapezoidal, and an opening of the first notch 205 is larger than a bottom surface of the first notch 205; the inner peripheral wall of the first sleeve 12 is provided with a plurality of second notches 121, each second notch 121 is uniformly distributed along the circumference of the first sleeve 12, the cross section of each second notch 121 is trapezoidal, and the opening of each second notch 121 is larger than the bottom surface of each second notch 121.

After two adjacent unreeling type steel skeleton 1 overlap joint and fixed connection each other, one of them second breach 121 of first sleeve 12 will rotate to the position of close first breach 205, and the bayonet socket is constituteed to first breach 205 and second breach 121 this moment, then toward bayonet socket inside card income fixture block 122, utilize fixture block 122 to realize first sleeve 12 promptly and the stopping of unreeling axle 204 soon to be connected, in order to ensure to put the soil lateral pressure that rolling type steel skeleton 1 received and can transmit to H shaped steel 20 on, thereby improve overall structure's common bearing capacity.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: equivalent changes in structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (8)

1. The utility model provides a SMW worker method stake supporting construction based on rich water deep basal pit, includes many linear lapped cement mixing stake (10) in proper order, per two cement mixing stake (10) correspond and set up an H shaped steel (20), its characterized in that: the H-shaped steel (20) is provided with a unreeling type steel skeleton (1), and when the unreeling type steel skeleton (1) is in an unreeling state, the unreeling type steel skeleton (1) is positioned in the cement mixing pile (10) between every two adjacent H-shaped steels (20); the unwinding type steel skeleton (1) comprises a plurality of steel sheets (11), the steel sheets (11) are arranged along the length direction of the H-shaped steel (20), the long side edges of two adjacent steel sheets (11) are hinged to each other, a first sleeve (12) is fixed on the steel sheet (11) at the head end of the unwinding type steel skeleton (1), a connecting rod (14) is arranged on the steel sheet (11) at the tail end of the unwinding type steel skeleton (1), an unwinding shaft (204) is arranged along the length direction of the H-shaped steel (20), and the first sleeve (12) is rotatably sleeved on the outer side of the unwinding shaft (204); the number of the unreeling type steel frames (1) of the H-shaped steel (20) is two, and the two unreeling type steel frames (1) are respectively in lap joint with the unreeling type steel frames (1) close to the H-shaped steel (20) on one side; when the tail ends of the two unreeling type steel frameworks (1) are overlapped, the connecting rod (14) of the unreeling type steel framework (1) is connected with the adjacent part of the unreeling type steel framework (1) through a connecting piece.

2. The SMW construction method pile supporting structure based on the water-rich deep foundation pit as claimed in claim 1, wherein: the front and the back of the unreeling type steel skeleton (1) are adhered with PTFE films (17).

3. The SMW construction method pile supporting structure based on the water-rich deep foundation pit as claimed in claim 1, wherein: the steel sheet (11) that are located unreel formula steel skeleton (1) the tail end is fixed with second sleeve (13), connecting rod (14) with second sleeve (13) rotate to be connected, just connecting rod (14) with be equipped with between second sleeve (13) and only allow connecting rod (14) in overlooking in-plane anticlockwise pivoted ratchet (15), the connecting piece includes a plurality of being fixed in claw (16) of connecting rod (14) outer wall, the length of claw (16) is greater than the thickness of steel sheet (11), when two tail ends of putting formula steel skeleton (1) overlap joint mutually, claw (16) stretch into the articulated clearance department that forms between the long side of two adjacent steel sheets (11).

4. The SMW construction method pile supporting structure based on the water-rich deep foundation pit as claimed in claim 1, wherein: when the tail ends of the two steel placing and rolling type steel frameworks (1) are overlapped, the steel sheets (11) of the two steel placing and rolling type steel frameworks (1) are parallel, and an included angle is formed between a parallel line of the steel sheets (11) and a distribution direction line of each cement stirring pile (10).

5. The SMW construction method pile supporting structure based on the water-rich deep foundation pit as claimed in claim 1, wherein: first breach (205) have been seted up to the outer wall of unreeling axle (204), a plurality of second breach (121) have been seted up to the internal perisporium of first sleeve (12), and each second breach (121) evenly arranges along the circumference of first sleeve (12), first breach (205) and arbitrary one second breach (121) constitute the bayonet socket, the bayonet socket is connect to have fixture block (122) in the bayonet socket.

6. A construction method of the SMW construction method pile supporting structure based on the water-rich deep foundation pit according to claim 1, characterized by comprising the following steps: the method comprises the following steps:

s1, preparing for construction;

s2, excavating a guide channel;

s3, constructing a cement mixing pile (10);

s4, construction of the H-shaped steel (20): inserting H-shaped steel (20) into a corresponding cement mixing pile (10) in a one-in-one-out mode, then driving a connecting rod (14) on a unreeling type steel skeleton (1) on the H-shaped steel (20) to move towards the direction of the adjacent H-shaped steel (20) through unreeling equipment until the unreeling type steel skeleton (1) is in a completely unreeled state, and connecting two unreeling type steel skeletons (1) through connecting pieces;

s5, constructing the crown beam (30).

7. The construction method of the SMW construction method pile supporting structure based on the water-rich deep foundation pit as claimed in claim 6, wherein: the unwinding equipment comprises a base body (21) and two hydraulic cylinders (22) which respectively correspond to the unwinding type steel skeleton (1), wherein the base body (21) is provided with a matching groove (211) for downwards sleeving the upper end of the H-shaped steel (20), the hydraulic cylinders (22) are horizontally arranged, the cylinder bodies of the hydraulic cylinders (22) are provided with rotating shafts (23) which are rotatably connected with the base body (21), and the base body (21) is provided with a direction adjusting assembly for adjusting the direction of the hydraulic cylinders (22); the telescopic end of the hydraulic cylinder (22) is fixed with a support rod (221), and the end part of the support rod (221) is provided with a holding claw (222) for holding the connecting rod (14).

8. The construction method of the SMW construction method pile supporting structure based on the water-rich deep foundation pit as claimed in claim 7, wherein: transfer to the subassembly including being fixed in servo motor (31) on pedestal (21), the output of servo motor (31) is equipped with lead screw (32), lead screw (32) threaded connection has slider (33), slider (33) with pedestal (21) slide and connect, slider (33) are fixed with disk (35), disk (35) with the length direction of pneumatic cylinder (22) is followed to the cylinder body of pneumatic cylinder (22) slides and is connected.

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