Soft soil area cemented soil retaining wall foundation pit anti-sedimentation structure and construction method

Abstract

The invention discloses an anti-sedimentation structure for a foundation pit of a cemented soil retaining wall in a soft soil area and a construction method, and belongs to the field of anti-sedimentation of cemented soil retaining walls. The device comprises a shell, fixing bases are arranged on the two sides of the outer portion of the shell, movable inserting rods are arranged on one sides of the outer portions of the two fixing bases, and the front end and the rear end of the lower end of the interior of the shell are each provided with a row of supporting pieces. The problems that when an existing anti-sedimentation structure is supported through a spring and makes contact with soil through a supporting block, the horizontal position of the supporting block in the anti-sedimentation structure cannot be adjusted, and the installation position of the anti-sedimentation structure cannot be matched by adjusting the horizontal position of the supporting block are solved. Relative movement is generated through rotation of the threaded rod and the interior of the transmission ring, the supporting piece is driven to adjust the horizontal position after connection of the spring, and installation and adaptation of a soft soil area are achieved.

Description

Technical Field

[0001] The invention relates to the field of cement soil retaining wall anti-settlement, in particular to a cement soil retaining wall foundation pit anti-settlement structure in soft soil areas and a construction method. Background Art

[0002] Foundation pit anti-settlement structure refers to a series of engineering structures and measures designed in the foundation pit formed by underground excavation to prevent the bottom of the foundation pit or the surrounding soil from settling due to soil movement, groundwater changes or other geological factors. These structures may include underground continuous walls and support systems. The main purpose of these measures is to maintain the stability of the foundation pit and prevent safety problems caused by settlement or the impact on surrounding buildings, roads and underground pipelines.

[0003] A Chinese patent with publication number CN212926079U discloses a pipeline foundation pit anti-settlement structure, including connecting rod two, the lower part of which is sleeved with a spring one, the bottom end of the spring one is fixedly connected to the top of an adjacent limit plate one, the top of the spring one is fixed to the top inner wall of a receiving groove three, and a support block is provided. When the foundation pit settles, the support block at the settlement position moves downward under the action of the reaction force of the spring one. At this time, the spring one first pushes the limit plate one to move downward, thereby causing the limit plate one to push the connecting rod one to move downward, thereby causing the connecting rod one to push the support block to move downward, thereby allowing the support block to always be in contact with the bottom of the pit, thereby effectively reducing the bearing capacity of the insertion rod.

[0004] When the anti-settling structure of the above patent is supported by springs and the support blocks are in contact with the soil, the support blocks inside the anti-settling structure cannot be adjusted in horizontal position, and the installation position of the anti-settling structure cannot be adapted by adjusting the horizontal position of the support blocks. Summary of the invention

[0005] The purpose of the present invention is to provide a cement soil retaining wall foundation pit anti-settlement structure in soft soil areas and a construction method.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A cement soil retaining wall foundation pit anti-settlement structure in soft soil areas comprises an outer shell, both sides of the outer shell are provided with fixing seats, and one side of the outer sides of the two fixing seats is provided with a movable plug rod.

[0008] A row of support plates are arranged at both the front and rear ends of the lower end of the inner part of the shell, a movable rod is arranged in the middle of the upper ends of the two rows of support plates, a transmission plate is arranged on one side of the outer side of the movable rod, and a limit block is arranged on the top of the movable rod, the limit block is used to limit the limit downward amount of the transmission plate, and a spring is arranged between the transmission plate and the support plate;

[0009] The interior of the transmission sheet is connected to the external sliding slot of the movable rod, the two ends of the spring are respectively welded and fixed between the transmission sheet and the support sheet, a transmission ring is arranged in the middle of the transmission sheet, a threaded rod is arranged inside the transmission ring, and the outer part of the threaded rod is matched with the inner thread of the transmission ring, and a transmission disk rotatably arranged on the top of the shell is arranged on the top of the threaded rod;

[0010] An adjustment cavity is arranged outside the support sheet, and the adjustment cavity penetrates and extends to the upper and lower ends of the bottom of the shell;

[0011] First adapting grooves are provided on both sides of the interior of the housing, and a concave second adapting groove is provided at the lower end of each of the two first adapting grooves, and a mounting cavity is provided on one side of each of the second adapting grooves, and a fixing sheet is provided inside the mounting cavity;

[0012] An embedded block is arranged at the lower end of the fixing plate, and the embedded block is fixed to the shell by welding, and the lower end of the fixing plate penetrates the embedded block through an anti-sinking plate and extends to the lower end of the embedded block.

[0013] In the above solution, the outside of the fixing plate is connected to the internal sliding slot of the installation cavity;

[0014] The angle between the anti-sinking sheet and the insertion rod is forty-five degrees;

[0015] The two sides of the lower end of the outer part of the embedding block are recessed with a first adapting arc, and the lower end of the outer part of the anti-sinking plate is recessed with a second adapting arc.

[0016] In the above scheme, a lower support tube and an upper connecting rod are provided at the bottom of the support sheet, the upper connecting rod is fixed to the bottom surface of the support sheet, an inner expansion tube is installed in the lower support tube, an outer exploration port is provided on the side, an anchor body is horizontally installed in the outer exploration port, an outer expansion portion is provided on the inner expansion tube, and the outer expansion portion is used to push the anchor body out of the outer exploration port, and a one-way feeding structure is provided between the inner expansion tube and the lower support tube to limit the downward movement of the inner expansion tube;

[0017] The bottom of the upper connecting rod is inserted into the lower supporting tube, and a reverse stop structure is arranged between the two to limit the downward movement of the upper connecting rod.

[0018] In the above scheme, a limiting wedge groove 1 is provided on the outer side of the inner expansion cylinder, a limiting wedge groove 2 is provided on the outer side of the upper connecting rod, and an elastic locking pin 1 and an elastic locking pin 2 are provided on the side of the lower support cylinder. The limiting wedge groove 1 and the elastic locking pin 1 correspond and fit in position, and the limiting wedge groove 2 and the elastic locking pin 2 correspond and fit in position.

[0019] In the above scheme, the elastic locking pin 1 and the elastic locking pin 2 both include a fixing sleeve and a locking block that is slidably fitted in the fixing sleeve via an elastic body, and one end of the locking block extends to the outside of the fixing sleeve and fits with the corresponding limiting wedge groove;

[0020] Among them, the top depth of the limiting wedge groove 1 is greater than the bottom depth, and the top depth of the limiting wedge groove 2 is greater than the bottom depth.

[0021] In the above scheme, a connecting ring is sleeved on the outer side of the upper connecting rod, and the connecting ring and the upper connecting rod are fitted together inside and outside. A geotextile is clamped and installed on the connecting ring, and the geotextile is pre-buried in the backfill soil layer.

[0022] In the above scheme, a clamping groove is arranged on the inner side of the connecting ring, and an elastic connecting claw is matched in the clamping groove, and the elastic connecting claw is installed on the outer side of the upper connecting rod.

[0023] In the above scheme, the connecting ring includes a lower ring disk and an upper ring disk. The top of the lower ring disk is provided with an upper edge tube which is located in the center and extends upward and an anti-slip ring groove located on the outside of the upper edge tube. The bottom surface of the upper ring disk is provided with an annular bayonet, an anti-slip ring body located on the outside of the annular bayonet and an annular elastic pressure plate arranged on the outside of the anti-slip ring body. The annular bayonet and the upper edge tube are snap-fitted together, the anti-slip ring body is fitted in the anti-slip ring groove for fixing the geotextile, and the annular elastic pressure plate is used to press the geotextile before the anti-slip ring body is fitted with the anti-slip ring groove.

[0024] The construction method of the anti-settlement structure of the cement soil retaining wall foundation pit in the soft soil area comprises the following steps:

[0025] Step 1: Backfill soil

[0026] 11) Clean the base and level it, backfill the soil and level and compact it to obtain a backfill layer with a thickness of 10-15 cm;

[0027] 12) Lay the geotextile on the backfill layer, use the total station to mark the opening position on the geotextile, make openings at the opening positions, and make preliminary excavation at the opening positions. Install the connecting ring at the opening positions, first install the lower ring plate, which adopts a split structure, and then install the upper ring plate through the upper edge tube and the annular bayonet. At the same time, fix the geotextile between the anti-slip ring body and the anti-slip ring groove, and cover the upper ring plate with a plastic film;

[0028] 13) Backfill the earth on the geotextile and level and compact it;

[0029] 14) Repeat 11) to 13) to the designed elevation;

[0030] Step 2: Excavation and drilling

[0031] Use a total station to mark the hole location on the top surface of the backfill layer, drill holes at the hole location, and make preliminary excavation operations at the hole location, at least to the length of a lower support cylinder under the bottommost layer of geotextile;

[0032] Step 3: Installation of anti-settling structure

[0033] Align the lower support tube with the excavated hole, press the lower support tube downward, the inner expansion tube moves upward due to the obstruction of the bottom of the hole, and pushes the anchor body outward through the outer expansion part, extending outward from the outer exploration port and anchoring in the earthwork. At the same time, the elastic connecting claw enters the clamping groove to complete the connection between the connecting ring and the upper connecting rod. At this time, the plug rod extends from the fixing seat and is embedded in the foundation pit.

[0034] While the outer shell is being installed, the second adapter arc outside the anti-sinking plate moves toward the soil and tilts toward the embedded block, the anti-sinking plate passes through the embedded block and is embedded in the earth at the lower end of the embedded block. During the installation of the anti-sinking plate, the fixing plate at the upper end of the anti-sinking plate is embedded in the installation cavity on one side of the second adapter groove, and the fixing plate is penetrated by bolts and embedded into the inner shell to complete the fixation of the anti-sinking plate.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] After the two ends of the shell of the present invention are embedded in the foundation pit by means of insertion rods and the shell is fixed, the anti-sinking plate is inserted into the installation cavity by tilting and sliding. After being inserted into the installation cavity, the anti-sinking plate slides through the embedding block and embeds into the soft soil. The tilted anti-sinking plate can limit the soft soil at the lower embedding position to avoid the shell from being offset in position after it is installed and placed. The tilted anti-sinking plate can further adapt to the depression and protrusion of the soft soil, keeping the shell in a horizontal state to stably support the upper cement soil retaining wall, thereby improving the stability of the support.

[0037] The bottom of the shell of the present invention can adjust the initial support strength of the support sheet by adjusting the height of the transmission sheet, and cooperate with the internal spring and movable rod. The adaptive telescopic support structure is used in the area below the geotextile to achieve local support operations, so as to solve the problem of uneven settlement below the hardness. When local settlement occurs, the anchor body can be used to complete the local sinking of the earthwork when it sinks. After sinking, the lower support tube and the upper connecting rod are used to achieve effective support to avoid the settlement and cracks of the top structure. The geotextile can overall secure the soil layer above to prevent the earthwork below the shell from sinking at the bottom. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a stereoscopic diagram of the overall external structure of the present invention;

[0039] Figure 2It is a schematic diagram of the position relationship of the support sheet of the present invention;

[0040] Figure 3 A cross-sectional view of the internal structure of the housing of the present invention;

[0041] Figure 4 For the present invention Figure 3 A partial enlarged view of the middle A area;

[0042] Figure 5 For the present invention Figure 3 A partial enlarged view of the middle B area;

[0043] Figure 6 It is a schematic diagram of the position relationship of the transmission plate of the present invention;

[0044] Figure 7 It is a schematic diagram of the forces acting on the anti-settling sheet and the supporting sheet of the present invention when they bear soil;

[0045] Figure 8 This is the construction condition diagram of Example 2;

[0046] Fig. 9 for Figure 8 A partial enlarged view of point B in the middle;

[0047] Fig.10 for Fig. 9 The state diagram of the middle anti-slip ring groove and the anti-slip ring body when they are adapted;

[0048] Fig.11 for Figure 8 Position relationship diagram of the middle and lower support cylinder, upper connecting rod and inner expansion cylinder;

[0049] Fig.12 for Fig.11 A schematic diagram of the structure of the elastic locking pin;

[0050] Fig.13 It is a schematic diagram of the structure of the lower ring disk.

[0051] In the figure: 1, housing; 2, fixing seat; 3, plug rod; 4, transmission plate; 5, first adapter groove; 6, second adapter groove; 7, fixing plate; 8, embedding block; 9, first adapter arc; 10, anti-sinking plate; 11, second adapter arc; 12, supporting plate; 121, lower supporting cylinder; 122, upper connecting rod; 123, inner expansion cylinder; 124, outer probe; 125, anchor body; 126, inner expansion cylinder; 127, elastic locking pin 1; 1271, fixing sleeve; 1272, elastic body; 1273, locking block; 128. Elastic locking pin 2; 129. Connecting ring; 1291. Card-mounting groove; 1292. Elastic connecting claw; 1293. Lower ring plate; 12931. Upper tube; 12932. Anti-slip ring groove; 1294. Upper ring plate; 12941. Annular bayonet; 12942. Anti-slip ring body; 12943. Annular elastic pressure plate; 13. External expansion part; 14. Adjustment cavity; 15. Transmission sheet; 16. Installation cavity; 17. Movable rod; 18. Spring; 19. Transmission ring; 20. Threaded rod; 21. Geotextile. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] In order to solve the problem that when the existing anti-settling structure is supported by springs and the support blocks contact the soil, the support blocks inside the anti-settling structure cannot be adjusted in horizontal position, and the installation position of the anti-settling structure cannot be adapted by adjusting the horizontal position of the support blocks, this embodiment provides the following technical solutions:

[0054] Embodiment 1, as Figures 1 to 7 As shown, a cement soil retaining wall foundation pit anti-settlement structure in soft soil areas comprises an outer shell 1, both sides of the outer shell 1 are provided with fixing seats 2, and one side of the outer sides of the two fixing seats 2 is provided with movable insertion rods 3.

[0055] A row of support sheets 12 is disposed at both ends of the front and rear ends of the lower end of the housing 1, and a movable rod 17 is disposed in the middle of the upper ends of the two rows of support sheets 12. A transmission sheet 15 is disposed on one side of the outer side of the movable rod 17, and a limit block is disposed on the top of the movable rod 17. The limit block is used to limit the limit downward amount of the transmission sheet 15, and a spring 18 is disposed between the transmission sheet 15 and the support sheet 12;

[0056] The interior of the transmission sheet 15 is connected to the external sliding slot of the movable rod 17, and the two ends of the spring 18 are respectively welded and fixed between the transmission sheet 15 and the support sheet 12. A transmission ring 19 is provided in the middle of the transmission sheet 15, and a threaded rod 20 is provided inside the transmission ring 19, and the outer part of the threaded rod 20 is matched with the inner thread of the transmission ring 19, and the top of the threaded rod 20 is provided with a transmission plate 4 rotatably arranged on the top of the housing 1;

[0057] An adjustment cavity 14 is disposed outside the support sheet 12, and the adjustment cavity 14 penetrates and extends to the upper and lower ends of the bottom of the housing 1;

[0058] The housing 1 is provided with first adapting grooves 5 on both sides thereof, and the lower ends of the two first adapting grooves 5 are provided with recessed second adapting grooves 6, and one side of the second adapting grooves 6 is provided with a mounting cavity 16, and a fixing sheet 7 is provided inside the mounting cavity 16;

[0059] An embedding block 8 is disposed at the lower end of the fixing plate 7 , and the embedding block 8 is welded and fixed to the housing 1 . The lower end of the fixing plate 7 passes through the embedding block 8 through an anti-sinking plate 10 and extends to the lower end of the embedding block 8 .

[0060] The exterior of the fixing plate 7 is connected to the internal sliding slot of the mounting cavity 16;

[0061] The angle between the anti-sinking sheet 10 and the insertion rod 3 is forty-five degrees;

[0062] The first adapting arcs 9 are recessed on both sides of the lower end of the outer portion of the embedding block 8 , and the second adapting arcs 11 are recessed on the lower end of the outer portion of the anti-sinking plate 10 .

[0063] During implementation, the plug rod 3 is extended from the fixing seat 2 and embedded in the foundation pit to complete the installation of the shell 1. After installation, the spring 18 is pre-compressed by rotating the transmission plate 4, so that the support sheet 12 can be pressed on the earth below. When the lower soil layer settles unevenly, it will automatically compensate and enter the earth to support. The anti-sinking sheet 10 extends obliquely downward to the earth below to play an anchoring effect, avoid large-scale settlement problems at the bottom, and improve the overall stability of the installation of the shell 1.

[0064] Embodiment 2, based on the above embodiment, makes the following improvements:

[0065] like Figures 8 to 11As shown, the bottom of the support sheet 12 is provided with a lower support cylinder 121 and an upper connecting rod 122, the upper connecting rod 122 is fixed to the bottom surface of the support sheet 12, an inner expansion cylinder 123 is installed in the lower support cylinder 121, an outer probe 124 is provided on the side, an anchor body 125 is horizontally installed in the outer probe 124, an outer expansion portion 13 is provided on the inner expansion cylinder 126, the outer expansion portion 13 is used to push the anchor body 125 out of the outer probe 124, and a one-way feeding structure is provided between the inner expansion cylinder 126 and the lower support cylinder 121 to limit the downward movement of the inner expansion cylinder 126;

[0066] The bottom of the upper connecting rod 122 is inserted into the lower supporting tube 121 and a reverse stop structure is provided between the two to limit the upper connecting rod 122 from moving downward.

[0067] A limiting wedge groove 1 is provided on the outer side of the inner expansion cylinder 123, a limiting wedge groove 2 is provided on the outer side of the upper connecting rod 122, and an elastic locking pin 127 and an elastic locking pin 2 128 are provided on the side of the lower support cylinder 121. The limiting wedge groove 1 and the elastic locking pin 127 correspond and fit in position, and the limiting wedge groove 2 and the elastic locking pin 2 128 correspond and fit in position.

[0068] The elastic locking pin 127 and the elastic locking pin 2 128 both include a fixing sleeve 1271 and a locking block 1273 which is slidably matched in the fixing sleeve 1271 via an elastic body 1272, and one end of the locking block 1273 extends to the outside of the fixing sleeve 1271 and is matched with the corresponding limiting wedge groove;

[0069] Among them, the top depth of the limiting wedge groove 1 is greater than the bottom depth, and the top depth of the limiting wedge groove 2 is greater than the bottom depth.

[0070] A connecting ring 129 is sleeved on the outer side of the upper connecting rod 122. The connecting ring 129 and the upper connecting rod 122 are fitted together inside and outside. A geotextile 21 is clamped and installed on the connecting ring 129. The geotextile 21 is pre-buried in the backfill soil layer.

[0071] The inner side of the connecting ring 129 is provided with a clamping groove 1291 , and the clamping groove 1291 is equipped with an elastic connecting claw 1292 . The elastic connecting claw 1292 is installed on the outer side of the upper connecting rod 121 .

[0072] The connecting ring 129 comprises a lower ring disc 1293 and an upper ring disc 1294. The top of the lower ring disc 1293 is provided with an upper edge tube 12931 located in the center and extending upward and an anti-slip ring groove 12932 located on the outer side of the upper edge tube. The bottom surface of the upper ring disc 1294 is provided with an annular bayonet 12941, an anti-slip ring body 12942 located on the outer side of the annular bayonet 12941, and an annular elastic pressure plate 12943 arranged on the outer side of the anti-slip ring body 12942. The annular bayonet 12941 and the upper edge tube 12931 are provided. The anti-slip ring body 12942 is snap-fitted into the anti-slip ring groove 12932 from top to bottom to fix the geotextile 21. The anti-slip ring body 12942 is an annular structure with a figure-eight distribution in cross section and a certain elastic deformation. After fitting, the bottom of the anti-slip ring body 12942 will expand to both sides to fix the geotextile 21 in the anti-slip ring groove 12932 to achieve fitting operation. The annular elastic pressure plate 12943 is used to press the geotextile 21 before the anti-slip ring body 12942 fits with the anti-slip ring groove 12932.

[0073] During installation, the lower support tube 121 passes through the connecting ring 129 until it reaches the bottom of the lowest geotextile 21. The inner expansion tube 126 can be moved upwards during the downward pressure process, and the anchor body 125 can be extended and anchored in the earth through the outer expansion part 13. When uneven settlement occurs below the geotextile 21, the earth will drive the lower support tube 121 downwards, so that the lower support tube 121 can be re-coordinated with the upper connecting rod 122 to form a new support, thereby ensuring that the backfill layer on the geotextile 21 will not have settlement problems. After installation, the elastic connecting claw 1292 can be matched with the connecting ring 129 on the geotextile 21, so that the upper connecting rod 122 and the connecting ring 129 are adapted to form a whole.

[0074] A construction method for a cement soil retaining wall foundation pit anti-settlement structure in a soft soil area, comprising:

[0075] Step 1: Backfill soil

[0076] 11) Clean the base and level it, backfill the soil and level and compact it to obtain a backfill layer with a thickness of 10-15 cm;

[0077] 12) Lay the geotextile 21 on the backfill layer, mark the opening position on the geotextile 21 with a total station, make openings at the opening positions, and make preliminary excavation at the opening positions. Install the connecting ring 129 at the opening positions, first install the lower ring plate 1293, and the lower ring plate 1293 adopts a split structure, such as Fig.13 As shown, the upper ring disc 1294 is installed and fitted through the upper tube 12931 and the annular bayonet 12941, and the geotextile 21 is fixed between the anti-slip ring body 12942 and the anti-slip ring groove 12932, and the upper ring disc 1294 is covered with a plastic film;

[0078] 13) Backfill the earth on the geotextile 21 and level and compact it;

[0079] 14) Repeat 11) to 13) to the designed elevation;

[0080] Step 2: Excavation and drilling

[0081] The hole position is marked on the top surface of the backfill layer by using a total station, and a hole is drilled at the hole position, and a preliminary excavation operation is performed at the hole position, at least to the length of a lower support tube 121 below the bottommost layer of geotextile 21;

[0082] Step 3: Installation of anti-settling structure

[0083] Align the lower support tube 122 with the excavated hole, press the lower support tube 122 downward, and the inner expansion tube 123 moves upward due to the obstruction of the bottom of the hole, and pushes the anchor body 125 outward from the outer exploration port 124 through the outer expansion part 13 to be anchored in the earthwork, and at the same time, the elastic connecting claw 1292 enters the clamping groove 1291 to complete the connection between the connecting ring 129 and the upper connecting rod 122, and at this time, the insertion rod 3 extends from the fixing seat 2 and is embedded in the foundation pit;

[0084] While the outer shell 1 is being installed, the second adapter arc 11 outside the anti-sinking plate 10 moves toward the soil and tilts toward the embedding block 8, and the anti-sinking plate 10 penetrates the embedding block 8 and is embedded in the earth at the lower end of the embedding block 8. During the installation of the anti-sinking plate 10, the fixing plate 7 at the upper end of the anti-sinking plate 10 is embedded in the installation cavity 16 on one side of the second adapter groove 6, and the fixing plate 7 is penetrated by bolts and embedded in the inner shell 1 to complete the fixation of the anti-sinking plate 10.

[0085] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0086] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. A cement soil retaining wall foundation pit anti-settlement structure in soft soil areas, comprising a shell (1), both sides of the shell (1) are provided with fixed seats (2), and one side of the two fixed seats (2) is provided with a movable plug rod (3), characterized in that: A row of support plates (12) are arranged at both the front and rear ends of the lower end of the housing (1), a movable rod (17) is arranged in the middle of the upper ends of the two rows of support plates (12), a transmission plate (15) is arranged on one side outside the movable rod (17), and a limit block is arranged on the top of the movable rod (17), the limit block is used to limit the limit downward amount of the transmission plate (15), and a spring (18) is arranged between the transmission plate (15) and the support plate (12); The interior of the transmission sheet (15) is connected to the external sliding slot of the movable rod (17), and the two ends of the spring (18) are respectively welded and fixed between the transmission sheet (15) and the support sheet (12). A transmission ring (19) is arranged in the middle of the transmission sheet (15), and a threaded rod (20) is arranged inside the transmission ring (19), and the outside of the threaded rod (20) is matched with the internal thread of the transmission ring (19). A transmission disk (4) rotatably arranged on the top of the housing (1) is arranged at the top of the threaded rod (20); An adjustment cavity (14) is arranged outside the support sheet (12), and the adjustment cavity (14) penetrates and extends to the upper and lower ends of the bottom of the housing (1); Both sides of the housing (1) are provided with first adapting grooves (5), the lower ends of the two first adapting grooves (5) are provided with recessed second adapting grooves (6), one side of the second adapting grooves (6) is provided with a mounting cavity (16), and a fixing sheet (7) is provided inside the mounting cavity (16); An embedded block (8) is provided at the lower end of the fixing plate (7), and the embedded block (8) is fixed to the housing (1) by welding, and the lower end of the fixing plate (7) passes through the embedded block (8) through an anti-sinking plate (10) and extends to the lower end of the embedded block (8).

2. The anti-settlement structure of cement soil retaining wall foundation pit in soft soil area according to claim 1, characterized in that: The exterior of the fixing plate (7) is connected to the internal sliding groove of the mounting cavity (16); The angle between the anti-sinking sheet (10) and the insertion rod (3) is forty-five degrees; The first adapting arc (9) is provided in depressions on both sides of the lower end of the outer part of the embedding block (8), and the second adapting arc (11) is provided in depressions on the lower end of the outer part of the anti-sinking plate (10).

3. The anti-settlement structure of cement soil retaining wall foundation pit in soft soil area according to claim 1, characterized in that: The bottom of the support plate (12) is provided with a lower support tube (121) and an upper connecting rod (122), the upper connecting rod (122) is fixed to the bottom surface of the support plate (12), an inner expansion tube (123) is installed in the lower support tube (121), an outer probe (124) is provided on the side, an anchor body (125) is horizontally installed in the outer probe (124), an outer expansion portion (13) is provided on the inner expansion tube (126), the outer expansion portion (13) is used to push the anchor body (125) out of the outer probe (124), and a one-way feeding structure is provided between the inner expansion tube (126) and the lower support tube (121) to limit the downward movement of the inner expansion tube (126); The bottom of the upper connecting rod (122) is inserted into the lower supporting tube (121), and a reverse stop structure is provided between the two to limit the downward movement of the upper connecting rod (122).

4. The anti-settlement structure of cement soil retaining wall foundation pit in soft soil area according to claim 3, characterized in that: A limiting wedge groove 1 is arranged on the outer side of the inner expansion cylinder (123), a limiting wedge groove 2 is arranged on the outer side of the upper connecting rod (122), and an elastic locking pin 1 (127) and an elastic locking pin 2 (128) are arranged on the side of the lower support cylinder (122). The limiting wedge groove 1 and the elastic locking pin 1 (127) correspond in position and are adapted to each other, and the limiting wedge groove 2 and the elastic locking pin 2 (128) correspond in position and are adapted to each other.

5. The anti-settlement structure of cement soil retaining wall foundation pit in soft soil area according to claim 4, characterized in that: The elastic locking pin 1 (127) and the elastic locking pin 2 (128) both include a fixing sleeve (1271) and a locking block (1273) slidingly matched in the fixing sleeve (1271) via an elastic body (1272), one end of the locking block (1273) extending to the outside of the fixing sleeve (1271) and fitting with the corresponding limiting wedge groove; Among them, the top depth of the limiting wedge groove 1 is greater than the bottom depth, and the top depth of the limiting wedge groove 2 is greater than the bottom depth.

6. The anti-settlement structure of cement soil retaining wall foundation pit in soft soil area according to claim 5, characterized in that: A connecting ring (129) is sleeved on the outer side of the upper connecting rod (122), and the connecting ring (129) and the upper connecting rod (122) are fitted together inside and outside. A geotextile (21) is clamped and installed on the connecting ring (129), and the geotextile (21) is pre-buried in the backfill soil layer.

7. The anti-settlement structure of cement soil retaining wall foundation pit in soft soil area according to claim 6, characterized in that: The inner side of the connecting ring (129) is provided with a clamping groove (1291), and the clamping groove (1291) is equipped with an elastic connecting claw (1292), and the elastic connecting claw (1292) is installed on the outer side of the upper connecting rod (121).

8. The anti-settlement structure of cement soil retaining wall foundation pit in soft soil area according to claim 7, characterized in that: The connecting ring (129) comprises a lower ring disk (1293) and an upper ring disk (1294); the top of the lower ring disk (1293) is provided with an upper edge tube (12931) located in the center and extending upward and an anti-slip ring groove (12932) located outside the upper edge tube; the bottom surface of the upper ring disk (1294) is provided with an annular bayonet (12941), an anti-slip ring body (12942) located outside the annular bayonet (12941), and an anti-slip ring body (12942) located outside the annular bayonet (12941). The annular elastic pressure plate (12943) is arranged outside the anti-slip ring body (12942), and the annular bayonet (12941) and the upper edge tube (12931) are snap-fitted together. The anti-slip ring body (12942) is fitted into the anti-slip ring groove (12932) to fix the geotextile (21). The annular elastic pressure plate (12943) is used to press the geotextile (21) before the anti-slip ring body (12942) and the anti-slip ring groove (12932) are fitted together.

9. The construction method of a cement soil retaining wall foundation pit anti-settlement structure in soft soil area according to claim 8, characterized in that: The following steps are involved: Step 1: Backfill soil 11) Clean the base and level it, backfill the soil and level and compact it to obtain a backfill layer with a thickness of 10-15 cm; 12) Laying the geotextile (21) on the backfill layer, marking the opening position on the geotextile (21) by using a total station, drilling at the opening position, and making preliminary excavation at the opening position, installing the connecting ring (129) at the opening position, first installing the lower ring plate (1293), the lower ring plate (1293) adopts a split structure, and then installing the upper ring plate (1294) through the upper edge tube (12931) and the annular bayonet (12941), and at the same time, fixing the geotextile (21) between the anti-slip ring body (12942) and the anti-slip ring groove (12932), and covering the upper ring plate (1294) with a plastic film; 13) Backfill the earth on the geotextile (21) and level and compact it; 14) Repeat 11) to 13) to the designed elevation; Step 2: Excavation and drilling Using a total station to mark the hole opening position on the top surface of the backfill layer, drilling the hole at the hole opening position, and performing preliminary excavation work on the hole opening position, at least excavating to the length of a lower support tube (121) below the bottommost layer of geotextile (21); Step 3: Installation of anti-settling structure The lower support tube (122) is aligned with the excavated hole, and the lower support tube (122) is pressed downward. The inner expansion tube (123) moves upward due to the obstruction of the bottom of the hole, and the anchor body (125) is pushed outward through the outer expansion part (13) to extend outward from the outer exploration opening (124) and anchor in the earth. At the same time, the elastic connecting claw (1292) enters the clamping groove (1291), completing the connection between the connecting ring (129) and the upper connecting rod (122). At this time, the insertion rod (3) extends from the fixing seat (2) and is embedded in the foundation pit. While the housing (1) is being installed, the second adapting arc (11) outside the anti-sinking plate (10) moves toward the soil and tilts toward the embedding block (8), the anti-sinking plate (10) passes through the embedding block (8) and is embedded in the soil at the lower end of the embedding block (8), and during the installation of the anti-sinking plate (10), the fixing plate (7) at the upper end of the anti-sinking plate (10) is embedded in the installation cavity (16) on one side of the second adapting groove (6), and the fixing plate (10) is completed by passing the fixing plate (7) through the bolt and embedding it into the housing (1).

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