A pile-sheet retaining wall with pressure relief plate

Abstract

The present invention relates to the field of building technology, and in particular to a pile-sheet retaining wall with a pressure relief plate, which includes a plurality of pile-column assemblies, a plurality of sheet walls, a crown beam, and a pressure relief plate; this structure is not affected by geological conditions and foundation bearing capacity, and can be applied to situations where the proposed retaining wall is close to existing buildings and the stratum is mainly composed of soil layers with low bearing capacity, such as fill, and can also be used as the outer wall of an underground courtyard. The crown beam connects and fixes a plurality of bottom piles together, thereby improving the stability of the bottom piles. The pressure relief plate can be set at the crown beam or above the crown beam according to the actual terrain. The pressure relief plate can reduce the horizontal deformation of the top of the sheet wall on the one hand, and can also reduce the lateral pressure and bending moment of the lower pile body on the other hand, thereby meeting the needs of engineering economy. When there are many surrounding underground structures or obstacles or it is impossible to carry out anchor-type pile-sheet wall construction, this type of pile-sheet wall with a pressure relief plate can be selected.

Description

Technical Field

[0001] The invention relates to the technical field of construction, in particular to a pile-plate type retaining wall with a pressure relief plate. Background Art

[0002] Retaining walls are structures that support roadbed fill or hillside soil and prevent fill or soil from deforming and becoming unstable. At present, retaining walls are mainly divided into gravity retaining walls and light structure retaining walls according to the load-bearing method.

[0003] Characteristics of gravity retaining wall: Gravity retaining wall has a relatively large cross section, and its structure volume and weight are relatively large, which often causes a large foundation compressive stress. Therefore, its height on soft soil foundation is often limited by the bearing capacity of the foundation and cannot be built too high; on rock foundation, although it is not limited by the bearing capacity of the foundation, it will consume too much material if built too high, which is not economical. Therefore, gravity retaining wall is suitable for low walls, areas with good geological conditions and stone materials.

[0004] Lightweight retaining walls are mainly divided into cantilever retaining walls and buttress retaining walls. Lightweight retaining walls have a small cross-section and rely mainly on the backfill on the wall bottom plate to maintain their own stability under the action of soil pressure. Cantilever retaining walls are generally more advantageous when the wall height is about 6m, while buttress retaining walls are generally more economical when the wall height is greater than 9-15m.

[0005] However, when the proposed retaining wall is close to the building and the ground is mainly fill, the retaining wall foundation size and base bearing capacity are limited, and the above retaining wall is generally difficult to apply. Summary of the invention

[0006] The object of the present invention is to provide a pile-plate retaining wall with a pressure relief plate to solve the above-mentioned technical problems existing in the prior art.

[0007] In order to solve the above technical problems, the pile-plate retaining wall with a pressure relief plate provided by the present invention comprises a plurality of pile-column assemblies arranged in sequence at intervals, a plurality of plate walls, a crown beam and a pressure relief plate; the pile-column assembly comprises a pillar whose upper end is located above the ground and a bottom pile located below the ground; a plurality of the plate walls are respectively located between two adjacent pillars and fixed to the pillars; the crown beam is horizontally arranged and fixed to the tops of a plurality of the bottom piles; the bottom of the pillar extends below the ground and is fixed to the crown beam; the pressure relief plate is horizontally arranged on the back side of the plate wall and fixed to the crown beam or the plate wall.

[0008] Furthermore, the cross section of the pillar is square or rectangular, and the cross section of the bottom pile is circular.

[0009] Furthermore, the cross-sections of the pillar and the bottom pile are both rectangular.

[0010] Furthermore, the vertical center line of the pillar coincides with the vertical center line of the bottom pile.

[0011] Furthermore, the wall surface of the board wall is flush with an end of the support column away from the back of the board wall.

[0012] Furthermore, the bottom end of the board wall is flush with the bottom end of the support column.

[0013] The pile-plate retaining wall with pressure relief plate provided by the present invention is mainly used for the reinforcement of permanent slopes, and can also be used for temporary slope support for foundation pit excavation. It is applicable to the support of road cuttings and embankments in general areas, flooded areas and earthquake areas, as well as the support engineering of special roadbeds such as landslides. Compared with the retaining wall in the prior art, this structure is not affected by geological conditions and foundation bearing capacity. When it is close to the existing building and the compaction degree of the fertilizer trough backfill is not enough, it is not affected. It can be applied to the situation where the proposed retaining wall is close to the existing building and the stratum is mainly composed of soil layers with low bearing capacity such as backfill. It can also be used as the outer wall of the underground courtyard. The crown beam connects and fixes multiple bottom piles together, thereby improving the stability of the bottom piles. The pressure relief plate can be set at the crown beam or above the crown beam (i.e., connected to the plate wall) according to the actual terrain. The pressure relief plate can reduce the horizontal deformation of the top of the plate wall on the one hand, and can also reduce the lateral pressure and bending moment of the lower pile body on the other hand, meeting the needs of engineering economy. When there are many surrounding underground structures or obstacles or anchor-type pile-sheet wall construction is not possible, this type of pile-sheet wall with pressure relief plates can be selected.

[0014] More preferably, the bottom piles include steel pipe piles and corbels;

[0015] The side wall of the steel pipe pile is provided with a through hole connecting the inside and outside of the steel pipe pile cavity;

[0016] The bracket can be slidably extended from the tube cavity and inserted into the through hole.

[0017] During construction, after the steel pipe piles are in place, the actuator is used to push the end of the corbel from the tube cavity of the steel pipe pile, forcing the corbel to extend out of the steel pipe pile from the through hole, thereby forming a corbel structure connecting the steel pipe pile and the existing building foundation. Alternatively, the corbel structure serves as a stiffening rib to increase the connection strength between the bottom pile and the soil layer, thereby increasing the supporting capacity of the bottom pile. It is also easy to construct, less destructive, and low cost.

[0018] Furthermore, it comprises a corbel assembly, which comprises two or more corbels spaced apart in the circumferential direction of the tube cavity; the corbel assembly can be inserted into the tube cavity of the steel pipe pile in an axially sliding manner.

[0019] Furthermore, in the same corbel assembly, the rear ends of two or more corbels are hingedly connected to each other; the front ends of the corbels are inserted into the through holes from inside the tube cavity to outside the tube cavity;

[0020] Alternatively, the corbel assembly further comprises a connecting seat, and the rear end of the corbel is hingedly connected to the connecting seat.

[0021] Furthermore, a plurality of the corbel assemblies are arranged at intervals in the tube cavity of the steel pipe pile, and adjacent corbel assemblies are connected by an intermediate connecting rod.

[0022] Furthermore, it also includes a torsion spring, which is sleeved on the hinge shaft at the rear end of the corbel. When the torsion spring is in a working state, it tends to force the corbel to open outward in the radial direction.

[0023] The torsion spring is provided to facilitate the quick installation of the corbel assembly, that is, the corbel assembly is inserted into the tube cavity from one end of the steel pipe pile. When the corbel moves to the set through-hole position, the torsion spring can force the front end of the corbel to automatically insert into the through-hole. When multiple corbel assemblies are provided in the axial direction, the through-holes can be blocked in advance during the installation process. When all the corbel assemblies are moved to the vicinity of the corresponding through-holes, the blockages are removed. By synchronously moving the corbel assemblies up and down, all the corbels on multiple corbel assemblies can be inserted into the corresponding through-holes at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A schematic structural diagram of a pile-plate retaining wall with a pressure relief plate provided in an embodiment of the present invention;

[0026] Figure 2 A schematic diagram of the structure of the bottom pile and the pillar provided in an embodiment of the present invention;

[0027] Figure 3 A schematic structural diagram of a bottom pile and a support column provided in another embodiment of the present invention.

[0028] Figure 4 This is a schematic diagram of the steel pipe pile structure in Example 2 of the present invention;

[0029] Figure 5 The working principle diagram of the steel pipe pile in Example 2;

[0030] Figure 6 for Figure 4 The structural schematic diagram of the bracket assembly shown;

[0031] Figure 7 for Figure 6 A transverse cross-sectional view of the corbel assembly is shown;

[0032] Figure 8 A schematic structural diagram of a steel pipe pile structure provided in Example 3 of the present invention;

[0033] Fig. 9 for Figure 8 A partial enlarged diagram of the middle part;

[0034] Fig.10 for Fig. 9 The enlarged view of the part at B in the middle;

[0035] Fig.11 This is a schematic diagram of the structure at the moment when the support plate falls off;

[0036] Fig.12 This is a schematic structural diagram of the steel pipe pile structure provided in Example 4 of the present invention. DETAILED DESCRIPTION

[0037] The technical solution of the present invention will be described clearly and completely below 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 creative work are within the scope of protection of the present invention.

[0038] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] The present invention is further explained below in conjunction with specific implementation modes.

[0041] Example 1

[0042] like Figures 1 to 3As shown, the pile-plate retaining wall with a pressure relief plate provided in this embodiment includes a plurality of pile-column assemblies arranged in sequence at intervals, a plurality of plate walls 3, a crown beam 4 and a pressure relief plate 5; the pile-column assembly includes a pillar 2 whose upper end is located above the ground and a bottom pile 1 located below the ground; a plurality of plate walls 3 are respectively located between two adjacent pillars 2 and fixed to the pillars 2; the crown beam 4 is horizontally arranged and fixed to the tops of the plurality of bottom piles 1; the bottom of the pillar 2 extends below the ground and is fixed to the crown beam 4; the pressure relief plate 5 is horizontally arranged on the back side of the plate wall 3 and is fixed to the crown beam 4 or the plate wall 3.

[0043] The pile-plate retaining wall with pressure relief plates provided by the present invention includes pile columns, plate walls 3, pressure relief plates 5, etc., and retaining plates are arranged between the piles to stabilize the retaining structure of the soil body. It is mainly used for the reinforcement of permanent slopes, and can also be used for temporary slope support in foundation pit excavation. It is applicable to the support of road cuts and embankments in general areas, flooded areas and earthquake areas, as well as the support projects of special roadbeds such as landslides. Compared with the retaining walls in the prior art, this structure is not affected by geological conditions and foundation bearing capacity. When it is close to the existing building 6 and the compaction degree of the fertilizer trough backfill is not enough, it is not affected. It can be used in the case where the retaining wall to be built is close to the existing building 6 and the stratum is mainly composed of soil layers with low bearing capacity such as backfill. It can also be used as the outer wall of the underground courtyard. The crown beam 4 connects and fixes multiple bottom piles 1 together, thereby improving the stability of the bottom piles 1. The pressure relief plate 5 can be set at the crown beam 4 or above the crown beam 4 (i.e. connected to the board wall 3) according to the actual terrain. The pressure relief plate 5 can reduce the maximum bending moment value of the pile column load section and reduce the horizontal deformation value of the top of the board wall 3, thereby optimizing the cross-sectional size of the pile column and extending the length of the load section of the pile-board retaining wall without anchor cables. When there are many surrounding underground structures or obstacles or it is impossible to construct an anchor-type pile-board wall, this type of pile-board wall with a pressure relief plate can be selected.

[0044] The optimal position of the pressure relief plate pile wall of the present invention is recommended to be h1 = 0.58-1.0H. A small value is used when the foundation anchoring conditions are good, and a large value is used when the foundation anchoring conditions are poor. The board length is determined mainly by considering two factors. First, the unloading plate should have a certain effect, otherwise its advantages cannot be reflected. It is recommended that the anti-tilting bending moment formed by the unloading plate reaches 20% of the bending moment at the top of the pile; secondly, the unloading plate should not be too long. If the length of the unloading plate exceeds the rupture angle or the soil pressure of the unloading plate is too large to form a similar fixed support under the plate, it will be meaningless to continue to increase the length of the plate.

[0045] Preferably, if Figure 3 As shown, the cross section of the pillar 2 is square or rectangular, and the cross section of the bottom pile 1 is circular, which can be applied to a variety of mechanical hole-forming construction processes, such as impact drilling, rotary drilling, etc. Generally, mechanical hole-forming construction processes can be used in the case of water, and mechanical hole-forming or manual hole-digging construction processes can be used in the case of no water. Or, Figure 2As shown, the cross-sections of the pillars 2 and the bottom piles 1 are both rectangular, which can be applied to projects where waterless strata can be implemented by manual drilling.

[0046] The vertical center line of the support 2 coincides with the vertical center line of the bottom pile 1, so that the bottom pile 1 and the support 2 are fixed firmly and stably.

[0047] The wall surface of the board wall 3 is flush with the end of the support 2 away from the wall back of the board wall 3, that is, the flush surface is away from the building, which is convenient for decoration and setting of external ladders, etc.

[0048] The bottom end of the board wall 3 is flush with the bottom end of the support 2 , that is, the bottom of the board wall 3 extends below the ground, thereby enhancing the stability of the board wall 3 .

[0049] Example 2

[0050] This embodiment is basically the same as Embodiment 1, except that the bottom pile in this embodiment is a steel pipe pile structure.

[0051] like Figure 4-8 As shown, the bottom pile includes: a steel pipe pile 110 and a corbel 121; a through hole 112 connecting the inside and outside of the steel pipe pile cavity 111 is set on the side wall of the steel pipe pile 110; the corbel 121 extends from the cavity 111 through the through hole 112 to support the foundation of the existing building 6 from below.

[0052] In this embodiment, the corbel 121 can be inserted into the through hole 112 by sliding out from the tube cavity 111. The present invention has a simple structure and is easy to use. After the steel pipe pile 110 is arranged in place, the actuator 130 is used to push the end of the corbel 121 from the tube cavity 111 of the steel pipe pile 110, forcing the corbel 121 to extend out of the steel pipe pile 110 from the through hole 112, thereby forming a corbel 121 structure connecting the steel pipe pile 110 and the foundation, and is easy to construct, less destructive, and low in cost.

[0053] More preferably, the present embodiment includes a corbel assembly 120 , which includes two or more corbels 121 spaced apart from each other in the circumferential direction of the lumen 111 ; the corbel assembly 120 can be axially slidably inserted into the lumen 111 of the steel pipe pile 110 .

[0054] Reference Figure 6 and 7 As shown, in the same corbel assembly 120, the rear ends of two or more corbels 121 are hingedly connected to each other; the front end of the corbel 121 is inserted into the through hole 112 from the inside of the lumen 111 to the outside of the lumen 111; or, the corbel assembly 120 also includes a connecting seat, and the rear end of the corbel 121 is hingedly connected to the connecting seat.

[0055] Before the steel pipe pile 110 is arranged to a set depth, the corbel 121 is retracted into the through hole 112 in the radial direction of the steel pipe pile 110. That is, the front end of the corbel 121 does not extend out of the through hole 112, so that the steel pipe pile 110 can be smoothly inserted into the foundation. In the same corbel assembly 120, a plurality of corbels 121 are evenly arranged in the circumferential direction. For example, in this embodiment, the angle between the two corbels 121 is 180 degrees.

[0056] More preferably, the corbel assembly 120 further comprises a torsion spring, which is sleeved on a hinge shaft at the rear end of the corbel 121. The torsion spring tends to force the corbel 121 to open outward in the radial direction when in working state.

[0057] The torsion spring is provided to facilitate the quick installation of the corbel assembly 120, that is, the corbel assembly 120 is inserted into the tube cavity 111 from one end of the steel pipe pile 110. When the corbel 121 moves to the set position of the through hole 112, the torsion spring can force the front end of the corbel 121 to automatically insert into the through hole 112. When multiple corbel assemblies 120 are provided in the axial direction, the through hole 112 can be blocked in advance during the installation process. When all the corbel assemblies 120 move to the vicinity of the corresponding through hole 112, the blockage is removed. By synchronously moving the corbel assemblies 120 up and down, all the corbels 121 on the multiple corbel assemblies 120 can be inserted into the corresponding through hole 112 at the same time.

[0058] A limit latch 122 is provided on the bracket 121. When the bracket 121 rotates, the limit latch 122 touches the actuator 130, and the bracket assembly 120 is unfolded, and the bracket 121 extends through the hole to a set position.

[0059] The corbel assembly 120 preferably includes 2-6 corbels 121. The central axis of the through hole 112 forms an angle of 30-85° with the central axis of the steel pipe pile 110, so as to smoothly guide the front end of the corbel 121 to be inserted into the through hole 112. On the projection plane containing the central axis of the steel pipe pile 110, the distance between the upper vertex and the lower low point of the projection of the through hole 112 is greater than the diameter of the corbel 121, so that the corbel 121 can be perpendicular to the steel pipe pile 110 after being extended into place, or the corbel 121 can be arranged horizontally.

[0060] Preferably, the corbel 121 is extended and arranged at the bottom of the building foundation. The corbel 121 pop-up device of the present invention is located inside the micro steel pile, and is used to connect the bottom end of the foundation with the foundation and expand the grouting radius around the pile. Before the grouting construction, the corbel 121 hidden in the pipe diameter is driven and compressed to extend outward by the actuator 130. In the later high-pressure construction, a relatively complete cement-soil consolidation body can be effectively formed, and the extended corbel 121 extends into the surrounding concrete consolidation body to strengthen the connection between the steel pipe pile 110 and the concrete consolidation body, effectively improving the end bearing force and the pile bearing capacity. The extended corbel 121 can effectively support the concrete layer and the internal shock-absorbing foundation structure, and effectively transmit force.

[0061] The steel pipe pile 110 can be used in conjunction with grouting to form a composite pile foundation with a rigid core surrounded by concrete on the outside. This pile foundation has an outer diameter that is 100% to 200% larger than that of a simple steel pipe pile 110, and the foundation can directly transmit force to the micro steel pipe pile 110 through the micro pile bracket 121 device, and the steel pile is also directly stressed, so that the steel pile and the foundation will not be damaged at the junction.

[0062] Example 3

[0063] The structure of this embodiment is basically the same as that of embodiment 2, except that:

[0064] like Figure 8-11 As shown, in this embodiment, one or more corbel assemblies 120 are arranged at intervals in the tube cavity 111 of the steel pipe pile 110; when multiple corbel assemblies 120 are arranged, adjacent corbel assemblies 120 are connected by an intermediate connecting rod 152. The corbel assemblies 120 are inserted into the nearby foundation without supporting a foundation such as a concrete layer, which can also effectively increase the bearing capacity of the pile.

[0065] A compression spring 160 is provided in the tubular cavity 111 and at the bottom of the corbel assembly 120 at the lowest end. Both ends of the compression spring 160 are connected to the corbel assembly 120 at the lowest end and the steel pipe pile 110. When the compression spring 160 is compressed, it tends to force the corbel assembly 120 to move upward, thereby preventing the corbel 121 from extending out of the through hole 112.

[0066] Before the steel pipe pile 110 is inserted into the foundation and set at the position, the compression spring 160 can prevent the bracket assembly 120 from moving downward by its own elastic force, so that all the brackets 121 can be retracted into the through hole 112. When the steel pipe pile 110 is arranged in place, the actuator 130 such as the force transmission rod presses all the bracket assemblies 120 from top to bottom to overcome the elastic force of the compression spring 160 and move downward, and the brackets 121 gradually extend out of the through hole 112 to form the bracket 121 support structure of the pile body.

[0067] And also includes a support plate 140 , which is arranged in the tube cavity 111 and fixedly connected to the inner wall of the tube cavity 111 , and the bottom of the compression spring 160 rests on the support plate 140 .

[0068] It is more preferred based on the above technical solution, as Fig. 9 and 11 As shown, the support plate 140 is temporarily fixedly connected to the inner wall of the tubular cavity 111 by connecting ribs 141. When the actuator 130 is used to press all the corbel assemblies 120 from top to bottom to overcome the elastic force of the compression spring 160 and move downward, the compression spring 160 is compressed to the limit position and the front end of the corbel 121 extends out of the through hole 112 to the set extension distance, the connecting ribs 141 break, the support plate 140 is separated from the inner wall of the tubular cavity 111 (preferably the support plate 140 falls to the bottom of the tubular cavity 111 or separates from the steel pipe pile 110), and the compression spring 160 is released and fully unfolded, and no longer tends to force the corbel assembly 120 to move upward.

[0069] A top plate 151 is slidably provided in the lumen 111 and above the uppermost corbel assembly 120, and the top plate 151 is connected to the uppermost corbel assembly 120 via an intermediate connecting member 153 such as a connecting rod, and the actuator 130 pushes the corbel assembly 120 downward via the top plate 151; a bottom plate 150 is slidably provided in the lumen 111 and below the lowermost corbel assembly 120, and the bottom plate 150 is connected to the lowermost corbel assembly 120 via an intermediate connecting member 153 such as a connecting rod, and the top of the compression spring 160 rests against the bottom plate 150.

[0070] like Fig.10 As shown, a guide groove 113 is provided in the tube cavity 111 along the axial direction of the steel pipe pile 110 , and a guide key 154 cooperating with the guide groove 113 is provided on the bottom plate 150 and / or the top plate 151 .

[0071] More preferably, the bottom plate 150 and / or the top plate 151 are provided with a limiting structure for limiting the position of the corbel assembly 120 in the axial direction. The limiting structure includes an upper limiting structure for limiting the corbel 121 to be in a ready state before extending out of the through hole 112; and a lower limiting structure for limiting the corbel 121 to remain in a working state after extending out of the through hole 112. Fig.10As shown, the limiting structure includes: a limiting pin 155 and a limiting hole 114; an upper limiting hole 114 and a lower limiting hole 114 are arranged in the tubular cavity 111; the limiting pin 155 can be radially telescopically arranged in the mounting hole on the bottom plate 150 or the top plate 151; the limiting hole 114 is arranged on the travel path of the limiting pin 155, and a spring is arranged in the mounting hole, which tends to force the limiting pin 155 to extend out of the mounting hole and extend into the limiting hole 114.

[0072] The upper limit structure can be used to temporarily fix the bracket assembly, and combined with the compression spring, it can ensure that the bracket is extended through the hole in advance before the pile body is installed in place. The lower limit structure can ensure that the bracket remains extended after being extended to avoid retreating under external interference.

[0073] Example 4

[0074] The structure of this embodiment is basically the same as that of embodiment 2 or 3, except that:

[0075] Reference Fig.12 As shown, the corbel 121 is provided with a through hole 123. When the corbel 121 extends out of the steel pipe pile 110 through the through hole 112, the through hole 123 connects the inside and outside of the steel pipe pile 110. The steel bar 124 is inserted from the inner cavity of the steel pipe pile 110 from top to bottom, and the top of the steel bar 124 extends out from the through hole 123 and is inserted into the surrounding soil layer. When concrete is injected into the steel pipe pile 110, part of the concrete flows out from the through hole and wraps the steel bar 124 outside the steel pipe pile 110. After the concrete solidifies, an anchoring structure is formed, which greatly increases its bearing capacity. It is particularly suitable for construction under soft geological conditions, and is simple and less destructive.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pile-sheet retaining wall with a pressure relief plate, characterized in that: It includes a plurality of pile-column assemblies, a plurality of plate walls, a cap beam and a pressure relief plate arranged in sequence at intervals; The pile assembly includes a support column with an upper end located above the ground and a bottom pile located below the ground; a plurality of the plate walls are respectively located between two adjacent support columns and fixed to the support columns; The crown beam is horizontally arranged and fixed to the tops of the plurality of bottom piles; the bottom of the support column extends below the ground and is fixed to the crown beam; the pressure relief plate is horizontally arranged on the back side of the board wall and is fixed to the crown beam or the board wall; The bottom piles include steel pipe piles and corbels; The side wall of the steel pipe pile is provided with a through hole connecting the inside and outside of the steel pipe pile cavity; The bracket can be slidably extended from the tube cavity and inserted into the through hole; The corbel assembly comprises two or more corbels spaced apart in the circumferential direction of the tube cavity; the corbel assembly can be inserted into the tube cavity of the steel pipe pile in an axially slidable manner; A plurality of corbel assemblies are arranged at intervals in the lumen of the steel pipe pile; adjacent corbel assemblies are connected by an intermediate connecting rod; A compression spring is arranged in the tube cavity and at the bottom of the corbel assembly at the lowest end, and both ends of the compression spring are connected to the corbel assembly at the lowest end and the steel pipe pile. After being compressed, the compression spring tends to force the corbel assembly to move upward, thereby preventing the corbel from extending out of the through hole; and also includes a support plate, the bottom of the compression spring rests on the support plate; The support plate is temporarily fixed to the inner wall of the lumen by connecting ribs. When the actuator is used to press all the corbel assemblies from top to bottom to overcome the elastic force of the compression spring and move downward, the compression spring is compressed to the limit position and the front end of the corbel extends through the hole to the set extension distance, the connecting ribs break, the support plate is separated from the inner wall of the lumen, and the compression spring is released and fully unfolded, and no longer tends to force the corbel assembly to move upward.

2. The pile-sheet retaining wall with a pressure relief plate according to claim 1, characterized in that: The cross section of the pillar is square or rectangular, and the cross section of the bottom pile is circular.

3. The pile-sheet retaining wall with a pressure relief plate according to claim 1, characterized in that: The cross sections of the pillar and the bottom pile are both rectangular.

4. The pile-sheet retaining wall with a pressure relief plate according to claim 1, characterized in that: The vertical center line of the pillar coincides with the vertical center line of the bottom pile.

5. The pile-sheet retaining wall with a pressure relief plate according to claim 1, characterized in that: The wall surface of the board wall is flush with an end of the support column away from the wall back of the board wall.

6. The pile-sheet retaining wall with a pressure relief plate according to claim 1, characterized in that: The bottom end of the panel wall is flush with the bottom end of the support column.

7. The pile-sheet retaining wall with a pressure relief plate according to claim 1, characterized in that: In the same corbel assembly, the rear ends of two or more corbels are hingedly connected to each other; the front ends of the corbels are inserted into the through holes from the inside of the tube cavity to the outside of the tube cavity; Alternatively, the corbel assembly further comprises a connecting seat, and the rear end of the corbel is hingedly connected to the connecting seat.

8. The pile-sheet retaining wall with a pressure relief plate according to claim 1, characterized in that: It also includes a torsion spring, which is sleeved on the hinge shaft at the rear end of the corbel. When the torsion spring is in a working state, it tends to force the corbel to open outward in the radial direction.

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