CN115110366B - Municipal soft soil roadbed anti-sedimentation structure and construction method thereof - Google Patents

Abstract

The utility model relates to a municipal administration weak soil roadbed subsides prevention structure and construction method thereof belongs to the technical field of roadbed construction, it includes the mainboard, subplate and locating lever, the foundation ditch inner wall setting is hugged closely to the mainboard, the holding tank has been seted up on the inside lateral wall of mainboard towards the foundation ditch, the subplate is accomodate in the holding tank, the subplate rotates with the mainboard and is connected, when subplate and mainboard are perpendicular, subplate bottom surface and holding tank cell wall butt, locating lever one end inserts behind penetrating the mainboard and inlays in normal roadbed, this application has when weak soil roadbed produces subsidence trend, subplate and locating lever all atress, normal roadbed is to the subsidence of weak soil roadbed play the effect of resisting to weak soil roadbed this moment, thereby reach the effect that weak soil roadbed and normal roadbed juncture produced the wrong platform phenomenon.

Description

Municipal soft soil roadbed anti-sedimentation structure and construction method thereof

Technical Field

The application relates to the technical field of roadbed construction, in particular to a municipal soft soil roadbed anti-sedimentation structure and a construction method thereof.

Background

The soft soil roadbed refers to a common roadbed in a special area. Special design processing is required. Soft soil has the characteristics of large water content, poor permeability, low natural strength, high compressibility and the like. If the critical height is exceeded, the foundation is destabilized.

The anti-sedimentation construction of the soft soil roadbed can excavate soft soil silt, then fill sand and stone and the like in a foundation pit formed by excavation, backfill plain soil and tamp the soil in sequence, and finally seal the top by concrete. And concrete piles are inserted and fixed in the backfilled areas, so that the compressive capacity of the roadbed is enhanced, and sedimentation is resisted.

The anti-sedimentation measure on the soft soil roadbed is only aimed at the excavation area of the foundation pit, and the inventor considers that: after the soft soil roadbed is wholly settled, dislocation is generated between the soft soil roadbed and the adjacent normal roadbed, the traffic of vehicles is seriously influenced, and settlement prevention measures at the junction of the soft soil roadbed and the normal roadbed are needed to be solved.

Disclosure of Invention

In order to resist the phenomenon of dislocation at the junction of a soft soil roadbed and a normal roadbed and resist the settlement of the soft soil roadbed, the application provides a municipal soft soil roadbed settlement-preventing structure and a construction method thereof.

In a first aspect, the application provides a municipal soft soil roadbed anti-sedimentation structure, which adopts the following technical scheme:

the utility model provides a municipal administration weak soil roadbed prevents subsiding structure, includes mainboard, subplate and locating lever, and the foundation ditch inner wall setting is hugged closely to the mainboard, has seted up the holding tank on the inside lateral wall of mainboard orientation foundation ditch, and the subplate is accomodate in the holding tank, and the subplate rotates with the mainboard to be connected, and when subplate and mainboard were perpendicular, subplate bottom surface and holding tank cell wall butt, and locating lever one end inserts behind running through the mainboard and inlays in normal roadbed.

Through adopting above-mentioned technical scheme, the subplate rotates and accomodates in the holding tank, reduce the influence to foundation ditch backfill in the foundation ditch is backfilled, after the layer tamp of backfilling finishes, rotate the subplate to horizontality and with backfill layer top surface butt, the mainboard can also play the effect of strut to the foundation ditch in the time of backfilling, after the backfill finishes, the subplate is wrapped up by backfill area completely, the locating lever inserts in normal road bed, soft soil road bed and normal road bed have formed the connection through the mainboard promptly, subplate and locating lever, when soft soil road bed produced subsidence trend, subplate and locating lever all atress, normal road bed is to the subsidence of soft soil road bed play the effect of resisting soft soil road bed this moment to the production of wrong platform phenomenon of normal road bed juncture.

Optionally, the auxiliary plate is rotationally connected with the main plate and is also slidingly connected with the main plate, and the sliding direction is along the direction approaching to or far from the bottom of the foundation pit; the main board is provided with a plurality of inserting holes, adjacent inserting holes are formed at intervals along the sliding direction of the auxiliary board, and one end of the positioning rod penetrates through the inserting holes.

Through adopting above-mentioned technical scheme, the subplate can be relative mainboard gliding setting mode simultaneously, when being convenient for deal with the layering and backfill, every layer of different backfill height, through adjusting the position of subplate in vertical direction, still can guarantee the perpendicular mainboard of subplate and tamp the back backfill layer top butt after, reaches the effect of the abundant parcel subplate of final whole backfill region, and can fully bear the weight of under the subplate horizontality.

Optionally, a supporting rod is fixed at the end of the positioning rod, and the supporting rod is positioned at one end of the positioning rod far away from the normal roadbed; after the locating rod penetrates through the main board, one end of the supporting rod is abutted against the main board, and the other end of the supporting rod is abutted against the auxiliary board.

Through adopting above-mentioned technical scheme, the existence of bracing piece, cooperation mainboard and subplate form stable triangle-shaped structure, when the foundation ditch pit wall produced the trend towards the inside upset of foundation ditch, can carry out effectual support to the mainboard through bracing piece and subplate, promotes the stability of foundation ditch pit wall.

Optionally, be provided with the inserted block on the mainboard, the inserted block is located the mainboard and deviates from on the lateral wall of holding tank, and the perpendicular mainboard setting of inserted block, inserted block one end and mainboard fixed connection, the other end inserts and inlays inside normal road bed.

Through adopting above-mentioned technical scheme, the setting of inserted block makes the mainboard more firm with the fixed of normal road bed, and simultaneously when soft soil road bed upwards sled moved the mainboard through the subplate, the inserted block can also play the effect of resisting soft soil road bed subsidence.

Optionally, through-hole and rectangular hole have been seted up on the mainboard, and two have all been seted up to through-hole and rectangular hole, and the through-hole is opened through mainboard two relative lateral walls along subplate slip direction, and rectangular hole is located the holding tank cell wall, and rectangular hole is seted up along subplate slip direction, and the axis of rotation tip of subplate and mainboard is inserted and is inlayed in corresponding rectangular downthehole, and rectangular hole and through-hole intercommunication.

Through adopting above-mentioned technical scheme, the seting up of through-hole makes the through-hole on whole vertical direction after the mainboard stack on the same vertical direction can communicate, pours concrete in to the through-hole, and the axis of rotation of subplate and mainboard can be fixed to the concrete to stability after subplate and mainboard location has further been guaranteed.

Optionally, the main board is provided with a clamping groove, the inserting blocks and the clamping groove are distributed at two ends of the same main board, and the connecting line of the inserting blocks and the clamping groove is the sliding direction of the auxiliary board relative to the main board; adjacent main boards are connected end to end along the vertical direction, and the clamping grooves of the main boards positioned above are inserted on the inserting blocks of the main boards positioned below, and the through holes of the adjacent main boards are communicated end to end.

Through adopting above-mentioned technical scheme, the seting up of draw-in groove can guarantee in vertical direction, and adjacent mainboard head and tail insert the back adjacent through-hole can accurate butt joint to be convenient for pour the concrete to the through-hole in the end.

Optionally, be provided with inserted bar and gag lever post on the mainboard, the perpendicular mainboard setting of inserted bar, insert behind the inserted bar one end penetration inlay hole and inlay in normal road bed, the inserted bar other end and gag lever post fixed connection, gag lever post and mainboard towards the lateral wall butt of foundation ditch and be located the holding tank inside.

Through adopting above-mentioned technical scheme, the setting of inserted bar has further strengthened the firm in connection degree of mainboard and normal road bed, avoids the phenomenon that the mainboard dropped from the foundation ditch pit wall, has also strengthened the anti subsidence ability to soft soil road bed.

Optionally, be provided with the batten on the mainboard, the batten covers on rectangular hole, is provided with the extension subassembly on the gag lever post, and the extension subassembly is used for the effective length of extension gag lever post to support the batten tightly on the holding tank cell wall.

Through adopting above-mentioned technical scheme, the setting of batten has avoided too much backfill or backfilled rubble to fall into in the through-hole from rectangular downthehole, has guaranteed to follow-up smooth of pouring concrete in the through-hole, has avoided the phenomenon of jam in the through-hole.

Optionally, extension subassembly includes extension pipe, spring and dials the strip, along self length direction on the extension pipe, breach and displacement hole have been seted up, breach directly opens extension pipe one end tip, displacement hole is seted up along extension pipe length direction and adjacent breach setting, the spring is located extension pipe inside, spring one end and extension pipe inner wall fixed connection, the other end and dials strip fixed connection, dial the perpendicular extension pipe setting of strip, it is outside to be located the extension pipe after the tip that dials the strip kept away from the spring runs through the displacement hole, the extension pipe is kept away from breach one end and wood strip butt, the gag lever post tip inserts in the breach with dial strip closely butt.

Through adopting above-mentioned technical scheme, the extension subassembly has overcome the limited defect of gag lever post length, places through convenient joint, can strengthen the length of gag lever post fast to reach the effect to the batten support tightly, saved workman operating time.

In a second aspect, the application provides a construction method of a municipal soft soil roadbed anti-sedimentation structure, which adopts the following technical scheme:

a construction method of a municipal soft soil roadbed anti-sedimentation structure comprises the following steps:

s1, digging out raw soil, cleaning a substrate, and backfilling;

s2, backfilling the backfilling area in a layered manner, namely fixing the main board on the pit wall of the foundation pit, then backfilling and tamping, rotating the auxiliary board to be in a horizontal state after tamping is finished, and sliding the auxiliary board to be in abutting connection with the top surface of the backfilling layer;

s3, selecting a wood strip with a proper length from local materials, covering the wood strip on the strip hole, and mounting an extension assembly on the limiting rod to enable the wood strip to be abutted with the groove wall of the accommodating groove;

s4, backfilling the bottom of the foundation pit in an upward layered manner sequentially, and fixedly splicing the adjacent main boards from head to tail along the vertical direction to form a row of anti-sedimentation structures;

s5, arranging a plurality of rows of anti-sedimentation structures at intervals along the horizontal length direction of the foundation pit.

Through adopting above-mentioned technical scheme, the layering is backfilled and is tamped can guarantee the backfill quality, can also install mainboard and subplate simultaneously, and the whole installation operation of mainboard and subplate is simple and convenient, until after the back is backfilled at last, when the road bed concrete placement, carries out concrete placement in the mainboard simultaneously, accords with whole construction process, and the selection local material of batten, the control of length go up the workman manual break can, has guaranteed whole construction period.

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

1. the main board, the auxiliary board and the positioning rod are arranged to connect the normal roadbed with the soft soil roadbed, when the soft soil roadbed has a sedimentation trend, the soft soil roadbed presses the auxiliary board, the auxiliary board transmits force to the normal roadbed through the main board and the positioning rod, and the normal roadbed resists the upward tilting trend of the positioning rod, so as to resist the sedimentation of the soft soil roadbed;

2. the sliding mode of the auxiliary plate can be better suitable for the thickness of backfill layers of different layered backfill layers, so that the auxiliary plate can be fully abutted to the top of the tamped backfill layer;

3. the setting of extension subassembly can be the gag lever post fully adapts to the holding tank of equidimension not, can provide stable support to the stuff.

Drawings

FIG. 1 is a schematic view of a structure of an embodiment of the present application in use inside a foundation pit;

FIG. 2 is a schematic view of a partial structure after concealing a foundation pit and concealing a portion of the batten and extension member;

FIG. 3 is a schematic view showing a part of the structure of the card slot;

fig. 4 is a schematic view of a portion of a structure embodying an extension assembly.

Reference numerals illustrate: 1. a main board; 11. a receiving groove; 12. inserting and embedding holes; 13. inserting blocks; 14. a clamping groove; 15. a through hole; 16. a slit hole; 2. a sub-plate; 3. a positioning rod; 31. a support rod; 4. a rod; 41. a limit rod; 5. wood strips; 6. an extension assembly; 61. an extension tube; 62. a spring; 63. a poking bar; 7. a notch; 8. and a displacement hole.

Detailed Description

The present application is described in further detail below in conjunction with figures 1-4.

The embodiment of the application discloses municipal administration weak soil roadbed prevents subsiding structure.

For convenience in describing the embodiment now under the settlement structure application state, refer to fig. 1, a municipal soft soil roadbed settlement structure includes mainboard 1, subplate 2 and locating lever 3, mainboard 1 hugs closely the foundation pit wall, mainboard 1 is fixed with the foundation pit wall, subplate 2 and mainboard 1 rotate and are connected, and subplate 2 can slide on mainboard 1 simultaneously, the slip direction slides along vertical direction, subplate 2 rotates to the horizontality and is fixed with backfill, locating lever 3 inserts behind penetrating mainboard 1 in normal roadbed, when soft soil roadbed produced the trend of sinking, soft soil roadbed applys decurrent pressure to subplate 2, subplate 2 passes through mainboard 1 with the force transmission and gives locating lever 3, locating lever 3 produces the trend of upwarping, normal roadbed produces the antagonism to the perk of locating lever 3, thereby finally reach the effect of resisting soft soil roadbed subsidence.

Referring to fig. 1 and 2, a main board 1 is provided with a containing groove 11, an inserting hole 12, a through hole 15 and a strip hole 16, the containing groove 11 is positioned on the side wall of the main board 1 facing the interior of the foundation pit, the containing groove 11 is arranged along the vertical direction and penetrates through the two side walls of the main board 1 along the vertical direction, a plurality of inserting holes 12 are arranged, adjacent inserting holes 12 are arranged at intervals along the vertical direction, and the inserting holes 12 are positioned on the wall of the containing groove 11 facing the interior of the foundation pit; two through holes 15 and strip holes 16 are all offered, strip holes 16 are located on two opposite vertical cell walls of holding tank 11, strip holes 16 are offered along vertical direction, through holes 15 are distributed on two sides of holding tank 11, through holes 15 are offered along vertical direction and run through mainboard 1, through holes 15 communicate with strip holes 16 that are close to simultaneously, subplate 2 is located holding tank 11, subplate 2 bottom and mainboard 1 rotate and are connected, the axis of rotation level sets up, the tip of axis of rotation runs through strip holes 16 and then goes deep into in through hole 15.

Referring to fig. 2 and 3, the main board 1 is provided with an insert 13 and a clamping groove 14, the insert 13 is located on the side wall of the main board 1, which is opposite to the normal roadbed, one end of the insert 13 is fixedly connected with the main board 1, the other end of the insert 13 is inserted into the normal roadbed, the insert 13 is horizontally arranged, the top of the insert 13 protrudes out of the top end face of the main board 1, the bottom end face of the insert 13 is obliquely arranged, the oblique direction is upwards inclined along the direction away from the main board 1, the clamping groove 14 is formed at the bottom end of the main board 1, the clamping groove 14 and the insert 13 are located in the same vertical plane, a plurality of clamping grooves 14 are arranged along the vertical direction of the main board 1 and are mutually connected end to end, namely, the clamping groove 14 of the upper main board 1 is inserted into the insert 13 of the lower main board 1, and at the moment, the through holes 15 of the adjacent main boards 1 in the vertical direction are mutually communicated.

Referring to fig. 2 and 3, one end of the positioning rod 3 penetrates through the embedded hole 12 and then goes deep into the normal roadbed, the other end of the positioning rod is fixed with the supporting rod 31, one end of the supporting rod 31 is abutted with the main board 1, and the other end of the supporting rod is abutted with the auxiliary board 2, namely, the main board 1, the auxiliary board 2 and the supporting rod 31 form a stable right triangle structure. The positioning rod 3 is arranged perpendicular to the support rod 31. The mainboard 1 is further provided with a plug rod 4 and a wood strip 5, the plug rod 4 is horizontally arranged, one end of the plug rod 4 penetrates through the embedded hole 12 and is fixedly connected with a normal roadbed, the plug rod 4 is located above the locating rod 3, the other end of the plug rod 4 is fixedly provided with a limiting rod 41, the limiting rod 41 is located in the accommodating groove 11 and is in butt joint with the accommodating groove 11 opposite to the groove wall of the interior of the foundation pit, the end part of the limiting rod 41 is provided with an extension assembly 6, the wood strip 5 is placed on the strip hole 16, and the extension assembly 6 butts the wood strip 5 on the groove wall of the accommodating groove 11.

Referring to fig. 2 and 4, the extension assembly 6 includes an extension tube 61, a spring 62 and a pulling strip 63, a notch 7 and a displacement hole 8 are formed in the extension tube 61 along the length direction of the extension tube 61, the notch 7 is formed along the direction of the extension tube 61, and simultaneously one end of the extension tube 61 is opened, the displacement hole 8 is formed along the length direction of the extension tube 61 and is adjacent to the notch 7, the pulling strip 63 is vertically arranged in the extension tube 61, one end of the pulling strip 63 is strip-shaped, the other end of the pulling strip 63 is disc-shaped, one disc-shaped end of the pulling strip 63 is located in the extension tube 61, one end of the pulling strip 63 is located outside the extension tube 61 after penetrating the displacement hole 8, the spring 62 is located inside the extension tube 61, one end of the spring 62 is fixedly connected with the inner wall of the extension tube 61, the other end of the pulling strip 63 is fixedly connected with one end side wall of the pulling strip 63, one end of the extension tube 61 is far away from the notch 7 and is abutted against the wood strip 5, and the end of the limiting rod 41 is inserted into the notch 7 and tightly abutted against one disc-shaped end side wall of the pulling strip 63.

The embodiment of the application also discloses a construction method of the municipal soft soil roadbed anti-sedimentation structure.

The method comprises the following steps:

referring to fig. 1, S1, the original soil is excavated, the substrate is cleaned, and backfill is performed.

Referring to fig. 1 and 2, S2, backfilling the backfill area in layers, wherein the lower layer is backfilled by a rubble, the upper layer is backfilled by a rubble, and then the upper layer is backfilled and tamped by plain soil, and the plain soil backfill area is still backfilled in layers and tamped; the main board 1 is fixedly inserted on the pit wall of a foundation pit through the insertion block 13, backfilling and tamping are carried out, the auxiliary board 2 is rotated to be in a horizontal state after the tamping is finished, the auxiliary board 2 is slid to be abutted with the top surface of a backfill layer, and then the positioning rod 3 and the insertion rod 4 penetrate through the main board 1 and are inserted in a normal roadbed.

Referring to fig. 2 and 4, S3, selecting a wood strip 5 with a proper length from local materials, manually breaking the wood strip 5 with an improper length, covering the wood strip 5 on the strip hole 16, and mounting an extension assembly 6 on the limiting rod 41 to enable the wood strip 5 to be abutted with the groove wall of the accommodating groove 11; when the extension assembly 6 is installed, the poking bar 63 is poked to compress the spring 62, then the extension tube 61 is placed between the end part of the limiting rod 41 and the batten 5 through the notch 7, the poking bar 63 is loosened, the spring 62 rebounds at the moment, the poking bar 63 is abutted against the end part of the limiting rod 41, the force exerted by the spring 62 is applied in the horizontal direction, and the rest structure of the extension tube 61 after the notch 7 is removed from the end part of the extension tube 61 in the vertical direction forms limiting with the limiting rod 41.

Referring to fig. 2 and 3, S4, backfilling is sequentially performed from the bottom of the foundation pit to the upper layer, and adjacent main boards 1 are spliced and fixed from head to tail in the vertical direction to form a row of anti-sedimentation structures, and the clamping grooves 14 of the upper main board 1 are inserted and embedded on the top of the inserting blocks 13 of the lower main board 1 during splicing;

s5, arranging a plurality of rows of anti-sedimentation structures at intervals along the horizontal length direction of the foundation pit, and pouring concrete into the through holes 15 after the backfilling of the foundation pit is completed.

The embodiments of the present invention are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in this way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.

Claims (7)

1. A municipal administration weak soil roadbed prevents subsiding structure, its characterized in that: the foundation pit comprises a main plate (1), an auxiliary plate (2) and a positioning rod (3), wherein the main plate (1) is tightly attached to the inner wall of a foundation pit, a containing groove (11) is formed in the side wall, facing the inside of the foundation pit, of the main plate (1), the auxiliary plate (2) is contained in the containing groove (11), the auxiliary plate (2) is rotationally connected with the main plate (1), when the auxiliary plate (2) is perpendicular to the main plate (1), the bottom surface of the auxiliary plate (2) is abutted to the groove wall of the containing groove (11), and one end of the positioning rod (3) penetrates through the main plate (1) and is embedded in a normal roadbed; the auxiliary plate (2) is rotationally connected with the main plate (1) and is also in sliding connection, and the sliding direction is along the direction approaching to or far from the bottom of the foundation pit; the main board (1) is provided with a plurality of inserting holes (12), a plurality of adjacent inserting holes (12) are arranged at intervals along the sliding direction of the auxiliary board (2), and one end of the positioning rod (3) penetrates through the inserting holes (12); the main board (1) is provided with an inserting block (13), the inserting block (13) is positioned on the side wall of the main board (1) deviating from the accommodating groove (11), the inserting block (13) is perpendicular to the main board (1), one end of the inserting block (13) is fixedly connected with the main board (1), and the other end of the inserting block is inserted into the normal roadbed; through-hole (15) and rectangular hole (16) have been seted up on mainboard (1), two have all been seted up to through-hole (15) and rectangular hole (16), through-hole (15) are opened two relative lateral walls of mainboard (1) along subplate (2) slip direction, rectangular hole (16) are located holding tank (11) cell wall, rectangular hole (16) are seted up along subplate (2) slip direction, rotation axis tip of subplate (2) and mainboard (1) is inserted and is inlayed in corresponding rectangular hole (16), and rectangular hole (16) and through-hole (15) intercommunication.

2. The municipal soft soil subgrade anti-sedimentation structure according to claim 1, wherein: the end part of the positioning rod (3) is fixed with a supporting rod (31), and the supporting rod (31) is positioned at one end of the positioning rod (3) far away from a normal roadbed; after the positioning rod (3) penetrates through the main board (1), one end of the supporting rod (31) is abutted against the main board (1), and the other end is abutted against the auxiliary board (2).

3. The municipal soft soil subgrade anti-sedimentation structure according to claim 1, wherein: the main board (1) is provided with clamping grooves (14), the inserting blocks (13) and the clamping grooves (14) are distributed at two ends of the same main board (1), and the connecting line of the inserting blocks (13) and the clamping grooves (14) is the sliding direction of the auxiliary board (2) relative to the main board (1); adjacent main boards (1) are connected end to end along the vertical direction, clamping grooves (14) of the main boards (1) above are inserted on inserting blocks (13) of the main boards (1) below Fang Zhuban, and through holes (15) of the adjacent main boards (1) are communicated end to end.

4. The municipal soft soil subgrade anti-sedimentation structure according to claim 1, wherein: be provided with inserted bar (4) and gag lever post (41) on mainboard (1), inserted bar (4) perpendicular mainboard (1) set up, insert behind inserted bar (4) one end through inlay hole (12) and inlay in normal road bed, inserted bar (4) other end and gag lever post (41) fixed connection, gag lever post (41) and mainboard (1) are towards the lateral wall butt of foundation ditch and are located holding tank (11) inside.

5. The municipal soft soil subgrade anti-sedimentation structure according to claim 4, wherein: be provided with batten (5) on mainboard (1), batten (5) cover on rectangular hole (16), be provided with extension subassembly (6) on gag lever post (41), extension subassembly (6) are used for the effective length of extension gag lever post (41) to support batten (5) tightly on holding tank (11) cell wall.

6. The municipal soft soil subgrade anti-sedimentation structure according to claim 5, wherein: extension subassembly (6) are including extension pipe (61), spring (62) and dialling strip (63), notch (7) and displacement hole (8) have been seted up along self length direction on extension pipe (61), notch (7) directly open extension pipe (61) one end tip, displacement hole (8) are seted up along extension pipe (61) length direction and adjacent notch (7) set up, spring (62) are located extension pipe (61) inside, spring (62) one end and extension pipe (61) inner wall fixed connection, the other end and dialling strip (63) fixed connection, dialling strip (63) perpendicular extension pipe (61) set up, be located extension pipe (61) outside after the tip of dialling strip (63) keeping away from spring (62) runs through displacement hole (8), extension pipe (61) are kept away from notch (7) one end and are in butt with wood strip (5), gag lever post (41) tip inserts and inlays in notch (7) and dials strip (63) closely in butt.

7. The municipal soft soil subgrade anti-settling structure according to claim 6, wherein: the construction method comprises the following steps:

s1, digging out raw soil, cleaning a substrate, and backfilling;

s2, backfilling the backfilling area in a layered manner, firstly fixing the main board (1) on the pit wall of the foundation pit, then backfilling and tamping, rotating the auxiliary board (2) to be in a horizontal state after tamping is finished, and sliding the auxiliary board (2) to be in butt joint with the top surface of the backfilling layer;

s3, selecting a wood strip (5) with a proper length from local materials, covering the wood strip (5) on the strip hole (16), and mounting an extension assembly (6) on the limiting rod (41) to enable the wood strip (5) to be abutted with the groove wall of the accommodating groove (11);

s4, backfilling the bottom of the foundation pit in an upward layered manner sequentially, and splicing and fixing the adjacent main boards (1) from head to tail along the vertical direction to form a row of anti-sedimentation structures;

s5, arranging a plurality of rows of anti-sedimentation structures at intervals along the horizontal length direction of the foundation pit.