Recyclable foundation pit fender post structure based on soft soil layer prestress

Abstract

The recoverable foundation pit fender post structure based on the soft soil layer prestress comprises multiple sets of supporting piles and steel sheet piles symmetrically arranged on the two sides of the multiple sets of supporting piles, reinforcing steel pipes are inserted into the supporting piles, and a capping beam is jointly arranged above the two sets of steel sheet piles and the multiple sets of reinforcing steel pipes; four fixing grooves are formed in the upper portion of the coping beam, a U-shaped plate is connected into the two transversely-formed fixing grooves, and the bottom of the U-shaped plate extends to the position below the coping beam and is fixedly connected with an upper positioning plate. Four limiting grooves are further formed in the upper portion of the coping beam, side steel plates are arranged in the limiting grooves in a sliding mode, and the bottoms of the side steel plates penetrate through the coping beam and the upper positioning plate. The steel sheet piles on the side edges of the foundation pit are prevented from deforming in the modes of upper pressing limiting, middle net-shaped limiting and bottom inserting limiting of the foundation pit, the deformation resistance strength of the steel sheet piles is improved, and the collapse risk of the foundation pit is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of foundation pit excavation support, and more particularly to a recyclable foundation pit retaining pile structure based on prestressed soft soil layer. Background Art

[0002] Traditional foundation pit support structures often use horizontal bracing, which means that horizontal bracing is set between two opposite pit walls. The construction of the horizontal bracing is carried out simultaneously with earth excavation. During the excavation process, the horizontal bracing is used to support the support structures on both sides, which can ensure the stability of the foundation pit. It is widely used in foundation pit support. However, the horizontal bracing occupies the internal space of the foundation pit, restricting the movement of excavation equipment. At the same time, the construction speed of the horizontal bracing is slow and the construction period is long, which affects the construction progress inside the foundation pit.

[0003] Later, steel sheet piles were used to limit the side walls of the foundation pit to speed up the construction progress inside the foundation pit. However, as the foundation pit became deeper, the steel sheet piles were often deformed by the fluidity of the soft soil layer and the groundwater, and bulged toward one side of the foundation pit, posing a risk of collapse. It was impossible to use the foundation pit retaining pile structure to press and limit the upper part of the foundation pit. The middle mesh limit and the bottom insert limit method were used to avoid deformation of the steel sheet piles on the side of the foundation pit, improve their anti-deformation strength, and reduce the risk of foundation pit collapse.

[0004] At the same time, it is also impossible to recycle the structure on the retaining piles after the foundation pit excavation is completed. For this purpose, a solution is now provided. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a recyclable foundation pit retaining pile structure based on prestressing of soft soil layer.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a recyclable foundation pit retaining pile structure based on prestressing of soft soil layer, comprising multiple groups of supporting piles and steel sheet piles symmetrically arranged on both sides of the multiple groups of supporting piles, wherein reinforced steel pipes are inserted into the interior of the supporting piles, and a top pressure beam is commonly arranged above the two groups of steel sheet piles and the multiple groups of reinforced steel pipes, wherein four fixing grooves are opened above the top pressure beam, and U-shaped plates are connected to two of the transversely arranged fixing grooves, and the bottom of the U-shaped plate extends to the bottom of the top pressure beam and is fixedly connected to an upper positioning plate;

[0007] Four limiting grooves are also provided above the top pressure beam, and side steel plates are slidingly arranged inside the limiting grooves. The bottom of the side steel plates passes through the top pressure beam and the upper positioning plate, and the bottoms of the two side steel plates arranged horizontally are commonly connected to the lower positioning plate. The upper positioning plate and the lower positioning plate are both arranged to fit the outer wall of the steel sheet pile.

[0008] Furthermore, the two U-shaped plates are connected by a bidirectional threaded rod, and both sides of the bidirectional threaded rod are rotatably connected to the top pressure beam through a mounting plate, and a second handle is provided at the end of the bidirectional threaded rod.

[0009] Furthermore, the lower positioning plate is symmetrically provided with two mounting grooves on the side wall close to the steel sheet pile, and a movable roller is rotatably provided inside the mounting groove. The movable roller is transmission-coordinated with the side wall of the steel sheet pile, and the upper positioning plate is fixedly connected to the side steel plate by a fixed threaded rod.

[0010] Furthermore, the side walls opposite to each other of the side steel plates are each provided with a plurality of connection holes arranged in an array, and a connection piece is provided between two connection holes located on the same horizontal line.

[0011] Furthermore, the connecting part includes connecting steel column one, connecting steel column two and connecting steel column three, the connecting steel column one is slidingly matched with one end of the connecting steel column two, the other end of the connecting steel column two is fixedly connected to the connecting steel column three, and the connecting steel column one and the connecting steel column two are both threadedly connected to their corresponding connecting holes.

[0012] Furthermore, a plurality of pairs of raised plates are fixedly provided on the side wall of the lower positioning plate away from the steel sheet piles, and a limiting axis is fixedly provided between a pair of the raised plates.

[0013] Furthermore, a support plate is fixedly provided on the outer side of the limiting shaft, a positioning rod is vertically threadedly connected above the support plate, and a handle 1 is fixedly provided above the positioning rod.

[0014] Among them, the reinforcement steps of the foundation pit retaining pile structure for the steel sheet pile are as follows:

[0015] Top pressing reinforcement: Control the rotation of the bidirectional threaded rod, so that the two U-shaped plates drive the upper positioning plate to close to the side wall of the steel sheet pile, and press the upper part of the steel sheet pile to limit the position;

[0016] Middle mesh reinforcement: Control the rotation of the fixed threaded rod, move the side steel plate downward to the specified position, and then fix the side steel plate with the fixed threaded rod. Connect the ends of the connecting steel column 2 and the connecting steel column 1 to the corresponding connection holes respectively. Through multiple groups of connectors arranged horizontally and the side steel plates arranged longitudinally, a mesh-type limit is formed on the side wall of the foundation pit;

[0017] Bottom insertion reinforcement: After the side steel plate moves downward to the specified position, point the positioning rod on the lower positioning plate toward the upper surface of the foundation pit, then turn the control handle to insert the positioning rod into the upper surface of the foundation pit to reinforce and stabilize the position of the lower positioning plate.

[0018] The technical effects and advantages of the present invention are as follows:

[0019] The present invention relates to a device for fixing the upper and lower ends of the steel sheet piles by controlling the rotation of the two-way threaded rod, so that the two U-shaped plates drive the upper positioning plate to be close to the side walls of the steel sheet pile, and the upper and lower ends of the steel sheet piles are pressed and limited, and the fixed threaded rod is controlled to rotate, and after the side steel plate is moved downward to the specified position, the end portions of the connecting steel column second and the end portions of the connecting steel column one are respectively connected to the corresponding connecting holes, through the multiple sets of connecting pieces arranged horizontally and the side steel plates arranged longitudinally to form a mesh type limit for the side walls of the foundation pit. After the side steel plate moves downward to the specified position, the positioning rod on the lower positioning plate is directed to the upper surface of the foundation pit, and the handle is controlled to rotate to insert the positioning rod into the upper surface of the foundation pit, thereby reinforcing and stabilizing the position of the lower positioning plate. This device avoids deformation of the steel sheet piles on the side of the foundation pit by pressing and limiting the upper part of the foundation pit, mesh-type limiting in the middle, and inserting and limiting at the bottom, thereby improving its anti-deformation strength and reducing the risk of foundation pit collapse.

[0020] 2. The present invention removes the lower positioning plate from above the side steel plate by loosening the bolts above the lower positioning plate, and after loosening the fixing threaded rod, completes the removal of the side steel plate, loosens the bolts at the connection between the upper positioning plate and the U-shaped plate, and completes the disassembly of the upper positioning plate. At the same time, the positioning rod can be disassembled when the lower positioning plate is recycled, and the structure on the guard pile can be recycled to improve resource utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is the appearance diagram of the overall structure when the foundation pit in the present invention is dug.

[0022] Figure 2 It is a three-dimensional diagram of the overall structure of the enclosure assembly in the present invention.

[0023] Figure 3 This is the overall structural appearance of the foundation pit in the present invention when it is just excavated.

[0024] Figure 4 This is a three-dimensional diagram of the overall structure of the enclosure assembly in the initial position of the present invention.

[0025] Figure 5 It is a three-dimensional diagram of the structure above the middle pressure top beam of the present invention.

[0026] Figure 6 It is a three-dimensional diagram of the lower positioning plate and the movable roller in the present invention.

[0027] Figure 7 This is a three-dimensional diagram of the appearance of the connecting piece in the present invention.

[0028] Figure 8 It is a three-dimensional diagram of the overall structure of the positioning member in the present invention.

[0029] The accompanying drawings are marked as follows: 1. Support pile; 2. Steel sheet pile; 3. Reinforced steel pipe; 4. Top beam; 5. Fixing groove; 6. U-shaped plate; 7. Bidirectional threaded rod; 8. Lower positioning plate; 9. Side steel plate; 10. Fixed threaded rod; 11. Connecting hole; 12. Upper positioning plate; 13. Moving roller; 14. Connecting steel column one; 15. Connecting steel column three; 16. Support plate; 17. Raised plate; 18. Limiting shaft; 19. Positioning rod; 20. Handle one; 21. Handle two; 22. Connecting steel column two. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0031] Example 1: Please refer to Figures 1-8 As shown, in the prior art, as the foundation pit is dug deeper, the steel sheet pile 2 will be deformed by the fluidity of soft soil and groundwater, and will bulge toward one side of the foundation pit. This problem can be solved by the following solution:

[0032] In this embodiment, the recyclable foundation pit retaining pile structure based on prestressing of soft soil layer includes multiple groups of supporting piles 1 and steel sheet piles 2 symmetrically arranged on both sides of the multiple groups of supporting piles 1. Reinforced steel pipes 3 are inserted into the interior of the supporting piles 1. A top pressure beam 4 is commonly arranged above the two groups of steel sheet piles 2 and the multiple groups of reinforced steel pipes 3. Four fixing grooves 5 are opened above the top pressure beam 4. Two transversely arranged fixing grooves 5 are connected with U-shaped plates 6. The bottom of the U-shaped plate 6 extends to the bottom of the top pressure beam 4 and is fixedly connected with an upper positioning plate 12.

[0033] It should be explained that before the excavation of the foundation pit, the cement soil support piles 1 are constructed at a certain distance behind the foundation pit edge. During this process, in order to enhance the shear, bending and deformation resistance of the support piles 1, the reinforcing steel pipes 3 are vertically inserted into the support piles 1. At the same time, a certain length of the top of the reinforcing steel pipes 3 is reserved to be exposed outside the support piles 1. There are two rows of these pipes.

[0034] See also Figure 1-Figure 5 As shown, the two U-shaped plates 6 are connected by a bidirectional threaded rod 7, and both sides of the bidirectional threaded rod 7 are rotatably connected to the top beam 4 through a mounting plate, and a handle 21 is provided at the end of the bidirectional threaded rod 7;

[0035] It should be explained that: the two-way threaded rod 7 is controlled to rotate, and the two U-shaped plates 6 are limited by the fixing groove 5 and move closer to each other until the two U-shaped plates 6 drive the upper positioning plate 12 to cling to the side wall of the steel sheet pile 2, thereby preliminarily limiting the upper side of the steel sheet pile 2;

[0036] At the same time, when the steel sheet pile 2 is installed in the slot, the position of the steel sheet pile 2 is higher than the top of the support pile 1 and lower than the top of the reinforcing steel pipe 3;

[0037] When installing the top beam 4, the bottom of the top beam 4 is in contact with the top of the steel sheet pile 2, and the top beam 4 passes through the top of the multiple reinforced steel pipes 3 to limit the top beam 4 and ensure the stability of the top beam 4 during installation;

[0038] See also Figure 1-Figure 5 and Figure 6 As shown, four limiting grooves are further provided above the top pressure beam 4, and side steel plates 9 are slidably provided inside the limiting grooves. The bottoms of the side steel plates 9 pass through the top pressure beam 4 and the upper positioning plate 12, and the bottoms of the two transversely arranged side steel plates 9 are commonly connected to the lower positioning plate 8. The upper positioning plate 12 and the lower positioning plate 8 are both fitted with the outer wall of the steel sheet pile 2;

[0039] The two U-shaped plates 6 move closer to each other, driving the upper positioning plate 12, the side steel plates 9 and the lower positioning plate 8 to simultaneously cling to the outer wall of the steel sheet pile 2. The two side steel plates 9 on the same side limit the steel sheet pile 2 in the longitudinal direction.

[0040] See also Figure 1-Figure 5 and Figure 6 As shown, two mounting grooves are symmetrically provided on the side wall of the lower positioning plate 8 close to the steel sheet pile 2. Moving rollers 13 are rotatably provided inside the mounting grooves. The moving rollers 13 are in transmission cooperation with the side wall of the steel sheet pile 2. The upper limit plate and the side steel plate 9 are fixedly connected by a fixed threaded rod 10.

[0041] According to the depth of the foundation pit, adjust the distance that the side steel plate 9 moves downward, that is, the bottom of the lower positioning plate 8 is 20cm-50cm away from the upper surface of the foundation pit. After adjusting the position of the side steel plate 9, fix the side steel plate 9 by fixing the threaded rod 10. Then, install the connecting piece horizontally inside the corresponding connecting hole 11 to limit the steel sheet pile 2 horizontally. In conjunction with the longitudinal limit of the side steel plate 9, a mesh-type limit fixation is formed on the middle part of the steel sheet pile 2 to prevent the steel sheet pile 2 from deformation.

[0042] See also Figure 1-Figure 5 and Figure 6 As shown, the side walls opposite to the side steel plate 9 are each provided with a plurality of connection holes 11 arranged in an array, and a connection piece is provided between two connection holes 11 located on the same horizontal line;

[0043] See also Figure 1-Figure 2 and Figure 7 As shown, the connecting piece includes a connecting steel column 14, a connecting steel column 22 and a connecting steel column 3 15. The connecting steel column 14 is slidably matched with one end of the connecting steel column 22, and the other end of the connecting steel column 22 is fixedly connected to the connecting steel column 3 15. The connecting steel column 14 and the connecting steel column 2 22 are both threadedly connected to their corresponding connecting holes 11.

[0044] See also Figure 1-Figure 2 and Figure 8 As shown, a plurality of pairs of raised plates 17 are fixedly provided on the side wall of the lower positioning plate 8 away from the steel sheet pile 2, a limit shaft 18 is fixedly provided between a pair of raised plates 17, a support plate 16 is fixedly provided on the outside of the limit shaft 18, a positioning rod 19 is vertically threadedly connected above the support plate 16, and a handle 20 is fixedly provided above the positioning rod 19; the positioning rod 19 on the lower positioning plate 8 is directed toward the upper surface of the foundation pit, and then the handle 20 is controlled to rotate to insert the positioning rod 19 into the upper surface of the foundation pit, thereby further reinforcing the position of the lower positioning plate 8;

[0045] In this embodiment, the steel sheet piles 2 on the side of the foundation pit are prevented from deformation by means of upper pressure limiting, middle mesh limiting and bottom insertion limiting, thereby improving their anti-deformation strength and reducing the risk of foundation pit collapse.

[0046] The second embodiment addresses the problem that the structure on the retaining piles cannot be recycled after the foundation pit is excavated;

[0047] In this embodiment, after the excavation of the foundation pit is completed, the bolts above the lower positioning plate 8 are loosened, and the lower positioning plate 8 is removed from above the side steel plate 9. After loosening the fixing threaded rod 10, the side steel plate 9 is removed, and the bolts at the connection between the upper positioning plate 12 and the U-shaped plate 6 are loosened to complete the disassembly of the upper positioning plate 12. At the same time, when the lower positioning plate 8 is recovered, the disassembly of the positioning rod 19 can be completed, and the structure on the retaining pile can be recycled;

[0048] Working principle:

[0049] Construction of support piles 1: Level the site, measure and stake out, determine the positions of each support pile 1 and steel sheet pile 2, drill and slot according to the positions of support piles 1 and steel sheet piles 2, prepare slurry according to the site strength requirements, and spray the drilled holes to form support piles 1. During the pouring of support piles 1, pre-embed the reinforcing steel pipe 3 to its center and install the steel sheet piles 2 into the slots to form a preliminary retaining structure;

[0050] Install the top beam 4: Pass the bottom of the two groups of U-shaped plates 6 fixed by the two-way threaded rods 7 through the fixing grooves 5 and extend them to the bottom of the top beam 4. Fix the upper positioning plate 12 to the bottom of the two U-shaped plates 6 with bolts. Then, install the top beam 4 above the two steel sheet piles 2. After the top beam 4 passes through the multiple groups of reinforced steel pipes 3, control the handle 21 to rotate, driving the two-way threaded rods 7 to rotate, so that the two upper positioning plates 12 are close to the outer wall of the steel sheet pile 2, pressing the upper part of the steel sheet pile 2 to limit the position;

[0051] Install the side steel plates 9: Next, pass the bottom of the side steel plates 9 through the limiting slots on the top beam 4 and the upper positioning plate 12 in sequence, and fix the lower positioning plate 8 to the bottom of the two side steel plates 9 on the same side by bolts, so that the lower positioning plate 8 also fits tightly with the side wall of the steel sheet pile 2, and fix the side steel plates 9 on the upper positioning plate 12 by fixing the threaded rods 10;

[0052] Excavation of foundation pit: Excavate the foundation pit according to actual needs. As the foundation pit gets deeper and deeper, the steel sheet pile 2 will be deformed by the fluidity of soft soil and groundwater, and bulge to one side of the foundation pit. At this time, in order to avoid such phenomenon, the fixed threaded rod 10 is controlled to rotate, and the side steel plate 9 is moved downward. The side steel plate 9 is fixed and limited again by multiple sets of fixed threaded rods 10, and the two ends of the connecting piece are respectively connected to the connecting hole 11. The side wall of the foundation pit is limited in a mesh manner by the multiple sets of connecting pieces arranged horizontally and the side steel plates 9 arranged vertically, so as to avoid the side wall of the steel sheet pile 2 from being deformed.

[0053] By placing the positioning rod 19 on the lower positioning plate 8 toward the upper surface of the foundation pit and then controlling the handle 20 to rotate, the positioning rod 19 is inserted into the upper surface of the foundation pit, thereby further reinforcing the position of the lower positioning plate 8 and improving the anti-deformation strength of the steel sheet pile 2;

[0054] According to the above method, the enclosure treatment of other side walls of the foundation pit is completed.

[0055] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A recyclable foundation pit retaining pile structure based on prestressing of soft soil layers, comprising a plurality of groups of retaining piles (1) and steel sheet piles (2) symmetrically arranged on both sides of the plurality of groups of retaining piles (1), characterized in that: A reinforced steel pipe (3) is inserted into the interior of the support pile (1); a top pressure beam (4) is provided above the two groups of steel sheet piles (2) and the plurality of groups of reinforced steel pipes (3); four fixing grooves (5) are provided above the top pressure beam (4); two transversely arranged fixing grooves (5) are connected to a U-shaped plate (6); the bottom of the U-shaped plate (6) extends to the bottom of the top pressure beam (4) and is fixedly connected to an upper positioning plate (12); Four limiting grooves are also provided above the top pressure beam (4), and side steel plates (9) are slidably provided inside the limiting grooves. The bottom of the side steel plates (9) passes through the top pressure beam (4) and the upper positioning plate (12), and the bottoms of the two side steel plates (9) arranged transversely are commonly connected to a lower positioning plate (8). The upper positioning plate (12) and the lower positioning plate (8) are both arranged to fit the outer wall of the steel sheet pile (2).

2. The recyclable foundation pit retaining pile structure based on prestressing of soft soil layer according to claim 1 is characterized by: The two U-shaped plates (6) are connected via a bidirectional threaded rod (7), and both sides of the bidirectional threaded rod (7) are rotatably connected to the top beam (4) via a mounting plate. A second handle (21) is provided at the end of the bidirectional threaded rod (7).

3. The recyclable foundation pit retaining pile structure based on prestressing of soft soil layer according to claim 2 is characterized by: The lower positioning plate (8) is symmetrically provided with two mounting grooves on the side wall close to the steel sheet pile (2), and a movable roller (13) is rotatably provided inside the mounting groove. The movable roller (13) is transmission-coordinated with the side wall of the steel sheet pile (2), and the upper positioning plate (12) is fixedly connected to the side steel plate (9) by a fixed threaded rod (10).

4. The recyclable foundation pit retaining pile structure based on prestressing of soft soil layer according to claim 3 is characterized by: The side walls opposite to each other of the side steel plates (9) are each provided with a plurality of connection holes (11) arranged in an array, and a connection piece is provided between two connection holes (11) located on the same horizontal line.

5. The recyclable foundation pit retaining pile structure based on prestressing of soft soil layer according to claim 4 is characterized in that: The connecting member includes a connecting steel column one (14), a connecting steel column two (22) and a connecting steel column three (15), wherein the connecting steel column one (14) is slidably matched with one end of the connecting steel column two (22), and the other end of the connecting steel column two (22) is fixedly connected to the connecting steel column three (15), and the connecting steel column one (14) and the connecting steel column two (22) are both threadedly connected to their corresponding connecting holes (11).

6. The recyclable foundation pit retaining pile structure based on prestressing of soft soil layer according to claim 5 is characterized in that: A plurality of pairs of raised plates (17) are fixedly provided on the side wall of the lower positioning plate (8) away from the steel sheet pile (2), and a limiting axis (18) is fixedly provided between a pair of the raised plates (17).

7. The recyclable foundation pit retaining pile structure based on prestressing of soft soil layer according to claim 6 is characterized in that: A support plate (16) is fixedly provided on the outer side of the limiting shaft (18), a positioning rod (19) is vertically threadedly connected above the support plate (16), and a handle (20) is fixedly provided above the positioning rod (19).

8. The recyclable foundation pit retaining pile structure based on prestressing of soft soil layer according to any one of claims 1 to 7, characterized in that: The reinforcement steps of the foundation pit retaining pile structure for the steel sheet pile (2) are as follows: Top pressing reinforcement: controlling the rotation of the bidirectional threaded rod (7) to allow the two U-shaped plates (6) to drive the upper positioning plate (12) to be close to the side wall of the steel sheet pile (2), and to press the upper part of the steel sheet pile (2) to limit the position; Middle mesh reinforcement: Control the rotation of the fixed threaded rod (10), move the side steel plate (9) downward to the specified position, and then fix the side steel plate (9) through the fixed threaded rod (10), connect the end of the connecting steel column 2 (22) and the end of the connecting steel column 1 (14) to the corresponding connecting holes (11), and form a mesh-type limit on the side wall of the foundation pit through multiple groups of connecting parts arranged horizontally and the side steel plates (9) arranged vertically; Bottom insertion reinforcement: After the side steel plate (9) moves downward to the specified position, the positioning rod (19) on the lower positioning plate (8) is facing the upper surface of the foundation pit, and then the handle (20) is controlled to rotate to insert the positioning rod (19) into the upper surface of the foundation pit to reinforce and stabilize the position of the lower positioning plate (8).

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