Foundation pit supporting structure

Abstract

The utility model discloses a foundation pit supporting structure and relates to the technical field of foundation pit supporting, the bottom of a foundation pit can be reinforced by arranging a cemented soil reinforcing body and a concrete cushion layer at the bottom of the foundation pit, a groove is formed in the cemented soil reinforcing body, a reinforcing abutment is arranged in the groove, and the foundation pit supporting structure is formed. And then one end of the inclined throwing and supporting assembly is connected with the gravity type retaining wall, and the other end of the inclined throwing and supporting assembly is connected with the reinforcing abutment, so that force borne by the gravity type retaining wall can be transmitted to the concrete cushion layer and the cement soil reinforcing body through the reinforcing abutment, and the deformation resistance of the gravity type retaining wall is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of foundation pit support, in particular to a foundation pit support structure. BACKGROUND

[0002] In the construction, it is very important to monitor and control the deformation of the side wall of the foundation pit during the excavation of the foundation pit and the construction inside the foundation pit. As a construction technology with simple construction process, economy and easy-to-get materials, the gravity type cement-soil wall is widely used to control the deformation of the side wall of the shallow pit and the pit-in-pit.

[0003] Since the gravity type cement-soil wall only relies on its own weight to resist the lateral pressure of the soil body, the ability to control deformation is poor, especially for the foundation pit with large area and narrow size. After the lateral pressure of the side wall of the foundation pit causes the deformation of the gravity wall, the engineering pile in the pit, especially the prestressed pipe pile, may produce inclined deformation, which will cause a large amount of time cost loss and economic loss. CONTENT OF THE INVENTION

[0004] The embodiment of the present application provides a foundation pit support structure, which can solve the technical problem that the deformation of the gravity type cement-soil wall in the related art causes the inclined deformation of the engineering pile in the pit, especially the prestressed pipe pile.

[0005] In a first aspect, the embodiment of the present application provides a foundation pit support structure for cooperating with a foundation pit, comprising:

[0006] A gravity type retaining wall is used to be distributed along the circumference of the foundation pit, and the bottom of the gravity type retaining wall is inserted into the bottom of the foundation pit.

[0007] A cement-soil reinforcing body is used to be arranged below the bottom of the foundation pit, and the cement-soil reinforcing body is provided with a groove.

[0008] A reinforcing pier is partially arranged in the groove.

[0009] A concrete cushion layer is arranged on the upper surface of the cement-soil reinforcing body, and the concrete cushion layer is provided with a avoiding opening for the reinforcing pier to extend out of; and

[0010] An inclined throw support assembly is connected to one end of the gravity type retaining wall, and the other end of the inclined throw support assembly is connected to the reinforcing pier.

[0011] In some embodiments, when the gravity type retaining wall is arranged around the foundation pit, a notch is formed on the side of the gravity type retaining wall facing the foundation pit, a wooden board is arranged in the notch, and the lower edge of the wooden board is flush with the bottom of the foundation pit.

[0012] In some embodiments, one end of the inclined throw support assembly is fixedly connected to the gravity type retaining wall through the wooden board. In some embodiments, the other end of the inclined throw support assembly is fixedly connected to the reinforcing pier.

[0013] In some embodiments, the gravity retaining wall comprises a first side and a second side, the first side is arranged adjacent to the foundation pit and the second side is arranged away from the foundation pit when the gravity retaining wall is arranged around the foundation pit, and the first side and the second side are both inserted with the rod-shaped reinforcing members and extend to the lower side of the gravity retaining wall.

[0014] In some embodiments, the reinforcing pier is provided with a mounting groove, the diagonal bracing assembly comprises a first plate, a second plate and an I-beam, the first plate is connected with the gravity retaining wall, the second plate is arranged in the mounting groove, one end of the I-beam is connected with the first plate, and the other end of the I-beam is connected with the second plate.

[0015] In some embodiments, the reinforcing pier is inserted with a reinforcing member, and the other end of the reinforcing member is connected with the second plate.

[0016] In some embodiments, the supporting structure further comprises a supporting assembly, and the supporting assembly comprises:

[0017] a supporting plate comprising a bottom support and a pressing plate, the bottom support is arranged below the first plate to support the first plate, and the pressing plate is connected with the bottom support and abuts against the side of the first plate away from the gravity retaining wall;

[0018] a connecting plate fixedly arranged on the concrete cushion, the connecting plate is arranged at the side of the second plate facing the gravity retaining wall; and

[0019] a connecting rod, one end of the connecting rod is connected with the pressing plate, and the other end of the connecting rod is connected with the connecting plate.

[0020] In some embodiments, the reinforcing pier comprises a pier body and a plurality of reinforcing steel pipes, the reinforcing steel pipes comprise a first part inserted in the pier body and a second part inserted in the soil-cement reinforcing body, and the reinforcing steel pipes are distributed vertically.

[0021] In some embodiments, the plurality of reinforcing steel pipes comprises a first reinforcing steel pipe and a second reinforcing steel pipe, the bottom surface of the first reinforcing steel pipe is at the same horizontal plane as the bottom surface of the second reinforcing steel pipe, the length of the first reinforcing steel pipe is smaller than the length of the second reinforcing steel pipe, and the first reinforcing steel pipe is closer to the gravity retaining wall than the second reinforcing steel pipe.

[0022] In some embodiments, the upper end of the gravity retaining wall is provided with a concrete reinforcing steel plate.

[0023] The base pit supporting structure based on the embodiment of the application can reinforce the bottom of the base pit by arranging the cement soil reinforcing body and the concrete cushion layer at the bottom of the base pit, the groove is arranged on the cement soil reinforcing body, the reinforcing pier is arranged in the groove, one end of the inclined throw support assembly is connected with the gravity retaining wall, and the other end is connected with the reinforcing pier, so that the force borne by the gravity retaining wall can be transmitted to the concrete cushion layer and the cement soil reinforcing body through the reinforcing pier, thereby improving the deformation resistance of the gravity retaining wall. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0025] Figure 1 The structural schematic diagram of the base pit supporting structure provided by the embodiment of the present application is shown in the figure.

[0026] Figure 2 The structural schematic diagram of the base pit supporting structure provided by the embodiment of the present application is shown in the figure.

[0027] Figure 3 The structural schematic diagram of the base pit supporting structure provided by the embodiment of the present application is shown in the figure.

[0028] Figure 4 The structural schematic diagram of the reinforcing pier provided by the embodiment of the present application is shown in the figure.

[0029] Figure 5 The structural schematic diagram of the supporting assembly provided by the embodiment of the present application is shown in the figure.

[0030] Reference signs in the figure:

[0031] 100, gravity retaining wall; 110, rod-shaped reinforcing member;

[0032] 200, cement soil reinforcing body;

[0033] 300, reinforcing pier; 310, reinforcing member; 320, pier body; 330, reinforcing steel pipe;

[0034] 400, concrete cushion layer;

[0035] 500, inclined throw support assembly; 510, first plate part; 520, second plate part; 530, I-beam;

[0036] 600, wooden board;

[0037] 700, support assembly; 710, support plate; 720, connecting plate; 730, connecting rod;

[0038] 800, concrete reinforcing plate. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0040] Please refer to Figures 1-2 The present application provides a foundation pit supporting structure for cooperating with a foundation pit, comprising a gravity retaining wall 100, a cement soil reinforcing body 200, a reinforcing pier 300, a concrete cushion 400 and an inclined throwing supporting assembly 500.

[0041] The gravity retaining wall 100 (also referred to as a gravity cement soil wall) is distributed along the circumference of the foundation pit, and is generally formed by hole forming, grouting and simultaneous stirring and then molding, which can be achieved by a single-shaft mixer, a double-shaft mixer and a three-shaft mixer, etc.

[0042] The cement soil reinforcing body 200 is arranged below the bottom of the foundation pit and can be formed by grouting reinforcement method or cement mixing reinforcement method, i.e. by reinforcing the soil below the foundation pit to form a stable foundation pit.

[0043] After the gravity retaining wall 100 and the cement soil reinforcing body 200 are formed, the foundation pit is excavated, and the concrete cushion 400 is laid on the bottom of the foundation pit. It should be understood that when the concrete cushion 400 is laid, a groove is simultaneously excavated at the preset position of the reinforcing pier 300, and concrete is poured to form the reinforcing pier 300, so that the reinforcing pier 300 can finally be integrated with the concrete cushion 400 to form a structure.

[0044] In addition, a steel frame can be laid on the cement soil reinforcing body 200, and then concrete is poured to form the concrete cushion 400. By arranging the steel frame inside, the tensile capacity of the concrete structure is significantly improved, so that the concrete is not easy to break when bearing tensile force, i.e. the overall stiffness and stability of the concrete cushion 400 are improved, so that the structure can better bear external loads.

[0045] One end of the inclined throw support assembly 500 is connected with the gravity retaining wall 100, and the other end of the inclined throw support assembly 500 is connected with the reinforced pier 300, so that the lateral pressure of the gravity retaining wall 100 is conducted to the concrete cushion 400 and the reinforced pier 300 inside the foundation pit through the inclined throw support assembly 500. The horizontal resistance of the concrete cushion 400 and the vertical bearing capacity of the cement-soil reinforced body 200 are fully utilized, the problem of poor deformation control ability of the cement-soil gravity wall and the problem of limited use of the gravity cement-soil wall for the foundation pit with large area and long side length are solved, and the deformation control ability of the gravity cement-soil wall is improved.

[0046] In some embodiments, referring to Figure 2 , the gravity retaining wall 100 is formed with a notch towards the side of the foundation pit, and the notch is provided with a wooden board 600, the lower edge of the wooden board 600 is flush with the bottom of the foundation pit, and one end of the inclined throw support assembly 500 is fixedly connected with the gravity retaining wall 100 through the wooden board 600.

[0047] During the excavation of the foundation pit, the loose soil near the gravity retaining wall 100 needs to be cleaned to ensure that the inclined throw support assembly 500 can be fully connected with the gravity retaining wall 100, so as to facilitate the transmission of the lateral pressure of the gravity retaining wall 100 to the cement-soil reinforced body 200 and the concrete cushion 400.

[0048] It can be understood that, since the gravity retaining wall 100 is formed by punching holes in the pile body, there is a notch between adjacent pile bodies, and by filling the notch with a wooden board 600, the structural strength of the gravity retaining wall 100 can be increased, and the installation position of the inclined throw support assembly 500 can be provided.

[0049] In addition, when the gravity retaining wall 100 transmits the lateral pressure to the wooden board 600, the wooden board 600 will not affect the structural strength of the gravity retaining wall 100 due to its relatively small structural strength.

[0050] In some embodiments, referring to Figure 3 , the gravity retaining wall 100 includes opposite first and second sides, the first side is arranged adjacent to the foundation pit when the gravity retaining wall 100 is arranged around the foundation pit, the second side is arranged away from the foundation pit, and the first and second sides are both inserted with a rod-shaped reinforcing member 110 and extended to the lower side of the gravity retaining wall 100.

[0051] The whole gravity retaining wall 100 is annularly arranged around the foundation pit, which can not only prevent water but also prevent the foundation pit from collapsing. Therefore, in order to further strengthen the structural strength of the gravity retaining wall 100, a rod-shaped reinforcing member 110 can be inserted into the grouting soil after grouting is completed, so as to increase the structural strength of the gravity retaining wall 100. Since the gravity retaining wall 100 is subjected to lateral pressure, in the embodiment of the application, the rod-shaped reinforcing member 110 is arranged only on the first side close to the foundation pit and the second side opposite to the first side.

[0052] Specifically, the rod-shaped reinforcing member 110 can be a reinforcing bar, a steel pipe or the like rod-shaped reinforcing member 110 having a certain strength.

[0053] In some embodiments, referring to Figure 4 , the reinforcing pier 300 is provided with a mounting groove, the inclined throwing support assembly 500 includes a first plate portion 510, a second plate portion 520 and an I-beam 530, the first plate portion 510 is connected with the gravity retaining wall 100, the second plate portion 520 is arranged in the mounting groove, one end of the I-beam 530 is connected with the first plate portion 510, and the other end of the I-beam 530 is connected with the second plate portion 520.

[0054] The first plate portion 510 is a vertical plate, which ensures that the gravity retaining wall 100 is fully attached together. When the recess of the gravity retaining wall 100 is filled with a wooden board 600, the vertical plate and the wooden board 600 can be connected together by steel nails. The second plate portion 520 is a horizontal plate, which is arranged in the mounting groove and connected with the reinforcing pier 300. The horizontal plate has a large plane to stack the I-beam 530. The horizontal plate can also be attached to the reinforcing pier 300, which facilitates the transmission of force to the reinforcing pier 300, and then to the concrete cushion 400 and the gravity retaining wall 100.

[0055] The connection between the first plate portion 510 and the second plate portion 520 and the I-beam 530 can be welding or bolt connection, which is not limited here.

[0056] In order to increase the stability of the connection between the reinforcing pier 300 and the second plate portion 520, the lower end of the second plate portion 520 is connected with a reinforcing bar member 310. The reinforcing bar member 310 is provided with a plurality of reinforcing bar members 310, which are evenly distributed and inserted into the reinforcing pier 300, so as to ensure that the reinforcing pier 300 and the second plate portion 520 are tightly connected.

[0057] In the specific construction process, the reinforcing member 310 and the second plate part 520 can be welded together simultaneously or in advance when the reinforced pier 300 is being poured, and then the reinforcing member 310 is inserted into the reinforced pier 300 before the reinforced pier 300 is formed, so that the upper surface of the second plate part 520 is flush with the upper surface of the reinforced pier 300, and finally the reinforcing member 310, the reinforced pier 300 and the second plate part 520 form an integrated structure, thereby increasing the structural strength of the reinforced pier 300 and ensuring the close connection between the reinforced pier 300 and the second plate part 520.

[0058] It should be understood that the lateral pressure on the gravity retaining wall 100 is transmitted to the concrete cushion 400 and the cement-soil reinforced body 200 through the inclined bracing assembly 500, so the inclined bracing assembly 500 needs to have a certain structural strength, i.e. the first plate part 510, the second plate part 520 and the I-beam 530 need to have a certain volume and weight.

[0059] In the specific construction process, the second plate part 520 is first welded with the reinforcing member 310 and embedded with the reinforced pier 300, and then one end of the I-beam 530 is welded, and the other end of the I-beam 530 is connected, and the first plate part 510 needs to be hoisted first, and then the I-beam 530 is hoisted by the lifting tool to be welded with the first plate part 510 and the second plate part 520. In order to reduce the use of the lifting tool and reduce the construction difficulty, in another embodiment of the present application, please refer to Figure 5 , the supporting structure further comprises a supporting assembly 700, and the supporting assembly 700 comprises a supporting plate 710, a connecting plate 720 and a connecting rod 730.

[0060] Specifically, the supporting plate 710 comprises a bottom support and a pressing plate, the bottom support is arranged below the first plate part 510 for bearing the first plate part 510, and the pressing plate is connected with the bottom support and abuts against the side of the first plate part 510 away from the gravity retaining wall 100, i.e. a positioning groove is formed by the bottom support, the pressing plate and the gravity retaining wall 100, and the first plate part 510 can be hoisted into the positioning groove, so that the first plate part 510 does not need to be hoisted by the lifting tool all the time, i.e. only one lifting tool can realize the welding of the first plate part 510 and the I-beam 530, thereby reducing the construction difficulty.

[0061] The connecting plate 720 is fixedly installed on the concrete cushion 400, the connecting plate 720 is arranged in a spaced manner with the second plate part 520 and is located on a side of the second plate part 520 facing the gravity retaining wall 100, the connecting plate 720 can be connected through a pre-buried bolt to increase the connecting strength, and the two ends of the connecting rod 730 can be connected to the pressing plate and the connecting plate 720 respectively through a bolt or a welding manner, in this way, the support assembly 700 can not only position the first plate part 510 and reduce the construction difficulty, but also can pre-support through the support assembly 700, that is, when the diagonal bracing assembly 500 does not transmit the lateral pressure, the support plate 710, the connecting plate 720 and the connecting rod 730 can also transmit the lateral pressure in an auxiliary manner, so that the stability of the foundation pit is improved.

[0062] It needs to be understood that in the embodiment of the present application, the lateral pressure transmitted through the diagonal bracing assembly 500 is divided into vertical pressure and horizontal tension, the vertical pressure is transmitted to the cement-soil reinforced body 200 below the foundation pit through the reinforced pier 300, so that the cement-soil reinforced body 200 can stably bear the vertical pressure; the horizontal tension is transmitted to the cement-soil reinforced body 200 and the concrete cushion 400 through the reinforced pier 300, and also can stably bear the horizontal tension, so that the gravity retaining wall 100 can transmit part of the lateral pressure to the cement-soil reinforced body 200 and the concrete cushion 400 through the diagonal bracing assembly 500, so as to ensure the stability of the foundation pit.

[0063] In the above process, since the reinforced pier 300 is the primary receiving body of the lateral pressure from the gravity retaining wall 100, in order to ensure the stability, the reinforced pier 300 has a reinforcing member 310, and the reinforced pier 300 is also provided with a reinforcing steel pipe 330, specifically, the reinforced pier 300 includes a pier body 320 and a plurality of reinforcing steel pipes 330, the reinforcing steel pipe 330 includes a first part inserted into the pier body 320 and a second part inserted into the cement-soil reinforced body 200, and the reinforcing steel pipe 330 is distributed in a vertical direction.

[0064] Through the reinforcing steel pipe 330, the rigidity of the reinforced pier 300 can be significantly improved, so that the reinforced pier 300 can better resist deformation when subjected to lateral pressure, the reinforcing steel pipe 330 can share part of the load in the process of transmitting the lateral pressure, the stress condition of the reinforced pier 300 is reduced, and the load is transmitted to the adjacent cement-soil reinforced body 200, so as to enhance the cooperative working capacity of the whole structure.

[0065] Further, please refer to Figure 4, the plurality of reinforcing steel pipes 330 include a first reinforcing steel pipe and a second reinforcing steel pipe, a bottom surface of the first reinforcing steel pipe is in the same horizontal plane as a bottom surface of the second reinforcing steel pipe, a length of the first reinforcing steel pipe is less than a length of the second reinforcing steel pipe, and the first reinforcing steel pipe is closer to the gravity retaining wall 100 than the second reinforcing steel pipe.

[0066] The first reinforcing steel pipe is farther from the upper surface of the reinforcing pier 300 than the second reinforcing steel pipe, so the first reinforcing steel pipe is mainly subjected to a horizontal tensile force in the transverse direction, thereby providing shear resistance, and the second reinforcing steel pipe is mainly subjected to a horizontal force in the transverse direction and a vertical force in the vertical direction, the horizontal force in the transverse direction provides shear resistance, and the vertical force provides overturning resistance.

[0067] In the specific construction process, the first reinforcing steel pipe and the second reinforcing steel pipe are embedded in the grooves and into the cement-soil reinforced body 200, and the embedded depth is 1 meter. The first reinforcing steel pipe and the second reinforcing steel pipe not only increase the rigidity of the reinforcing pier 300, but also transmit the lateral pressure to the cement-soil reinforced body 200, thereby sharing part of the load, reducing the stress on the reinforcing pier 300, transmitting the stress to the adjacent cement-soil reinforced body 200, and enhancing the cooperative work capacity of the entire structure.

[0068] In another embodiment of the present application, referring to Figures 1-3 The upper end of the gravity retaining wall 100 is provided with a concrete reinforced steel reinforcing plate 800. The concrete reinforcing plate at the top serves as part of the wall body, thereby increasing the overall weight of the wall body and enhancing the overturning resistance of the retaining wall, thereby improving the stability of the retaining wall. When the soil exerts a lateral pressure on the retaining wall, the presence of the concrete reinforced steel reinforcing plate 800 makes the wall body less likely to overturn or slide.

[0069] The specific construction process can be that part of the rod-shaped reinforcing member 110 is inserted into the first side and the second side of the gravity retaining wall 100 and extends to the upper surface of the gravity retaining wall 100, then the reinforcing steel is bundled to form a steel frame on the part of the gravity retaining wall 100, and then the cement is poured to form the concrete reinforced steel reinforcing plate 800.

[0070] The embodiment of the present application also provides a construction method for implementing the above-mentioned foundation pit supporting structure, which comprises the following steps:

[0071] S1, performing cement mixing pile construction on the soil in the predetermined construction area to form the gravity retaining wall 100 with a first depth;

[0072] S2, cement mixing pile construction is performed on the soil body within the second depth of the area surrounded by the gravity retaining wall 100 to form the cement-soil reinforced body 200, the first depth is greater than the second depth;

[0073] S3, the soil within the second depth of the area surrounded by the gravity retaining wall is excavated to form a foundation pit;

[0074] S4, the groove is excavated on the surface of the cement-soil reinforced body 200, and the concrete is poured on the upper surface of the cement-soil reinforced body 200 to form the concrete cushion 400;

[0075] S5, the reinforced steel pipe 330 is driven into the groove, and the concrete is poured in the groove to form the reinforced pier 300;

[0076] S6, the bottom end of the inclined support assembly 500 is fixed with the reinforced pier 300, and the top end is fixed with the gravity retaining wall 100.

[0077] Through the above construction method, the lateral pressure of the gravity retaining wall 100 can be transmitted to the concrete cushion 400 and the cement-soil reinforced body 200 through the reinforced pier 300, thereby improving the anti-deformation ability of the gravity retaining wall 100 and improving the stability of the foundation pit.

[0078] It can be understood that the above steps do not have a strict order, and adjacent steps can also be performed synchronously.

[0079] In step S2, the rod-shaped reinforcing member 110 can be inserted into the gravity retaining wall 100 near the first side of the foundation pit, and the rod-shaped reinforcing member 110 can also be inserted into the second side opposite to the first side, thereby increasing the structural strength of the gravity retaining wall 100 and improving the anti-overturning ability.

[0080] The rod-shaped reinforcing member 110 can be partially inserted into the gravity retaining wall 100, leaving a section above the gravity retaining wall 100, which can be bundled with the steel bars to form a steel bar frame, and then the concrete is poured to form a concrete steel bar reinforced plate 800, which can increase the overall weight of the wall and enhance the ability of the retaining wall to resist overturning, thereby improving the stability.

[0081] Since the inclined throwing support assembly 500 comprises the first plate part 510, the second plate part 520 and the I-beam 530, in step S8, the steel bars are welded through the bottom of the second plate part 520 and inserted into the unformed reinforced pier 300 together with the second plate part 520, and in the subsequent steps, the I-beam 530 is welded together with the second plate part 520, so as to improve the tensile capacity and load capacity of the reinforced pier 300, and also make the second plate part 520 and the reinforced pier 300 stably connected together.

[0082] The same or similar reference signs in the drawings of the embodiments correspond to the same or similar components; in the description of the present application, it is understood that if the terms "upper", "lower", "left", "right" and the like indicate the orientation or positional relationship, it is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the terms describing the positional relationship in the drawings are only used for exemplary illustration, and cannot be understood as a limitation of the present patent, for those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0083] The above only describes the preferred embodiments of the present application and does not limit the present application, any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A foundation pit support structure for cooperation with a foundation pit, characterized by, The supporting structure comprises: a gravity retaining wall arranged around the foundation pit; a cement-soil reinforcement arranged below the bottom of the foundation pit, the cement-soil reinforcement being provided with a groove; a reinforcement pier arranged partially in the groove; a concrete cushion arranged on the upper surface of the cement-soil reinforcement, the concrete cushion being provided with a clearance for the reinforcement pier to extend out of; and an inclined throw support assembly, one end of the inclined throw support assembly being connected to the gravity retaining wall, and the other end of the inclined throw support assembly being connected to the reinforcement pier.

2. The excavation support structure of claim 1, wherein, When the gravity retaining wall is arranged around the foundation pit, a notch is formed on the side of the gravity retaining wall facing the foundation pit, and a wooden board is arranged in the notch, the lower edge of the wooden board being flush with the bottom of the foundation pit. The one end of the inclined throw support assembly is fixedly connected to the gravity retaining wall through the wooden board.

3. The excavation support structure of claim 1, wherein, The gravity retaining wall comprises opposite first and second sides, when the gravity retaining wall is arranged around the foundation pit, the first side is arranged adjacent to the foundation pit, and the second side is arranged away from the foundation pit, the first and second sides are both inserted with rod-shaped reinforcing members and extend to the lower side of the gravity retaining wall.

4. The excavation support structure of claim 1, wherein, The reinforcement pier is provided with a mounting groove, the inclined throw support assembly comprises a first plate, a second plate and an I-beam, the first plate is connected to the gravity retaining wall, the second plate is arranged in the mounting groove, one end of the I-beam is connected to the first plate, and the other end of the I-beam is connected to the second plate.

5. A foundation pit retaining structure according to claim 4, wherein A reinforcing member is inserted in the reinforcement pier, and the other end of the reinforcing member is connected to the second plate.

6. The excavation support structure of claim 4, wherein, The supporting structure further comprises a support assembly, the support assembly comprises: a support plate comprising a bottom support and a pressing plate, the bottom support is arranged below the first plate to support the first plate, the pressing plate is connected to the bottom support and abuts against the side of the first plate away from the gravity retaining wall; a connecting plate fixedly installed on the concrete cushion, the connecting plate is arranged in a spaced manner with the second plate and located on the side of the second plate facing the gravity retaining wall; and a connecting rod, one end of the connecting rod is connected to the pressing plate, and the other end of the connecting rod is connected to the connecting plate.

7. The excavation support structure of claim 1, wherein, The reinforcement pier comprises a pier body and a plurality of reinforcing steel pipes, the reinforcing steel pipes comprise a first part inserted in the pier body and a second part inserted in the cement-soil reinforcement, and the reinforcing steel pipes are arranged vertically.

8. A foundation pit retaining structure according to claim 7, wherein The plurality of reinforcing steel pipes comprise first and second reinforcing steel pipes, the bottom surfaces of the first and second reinforcing steel pipes are in the same horizontal plane, the length of the first reinforcing steel pipe is smaller than the length of the second reinforcing steel pipe, and the first reinforcing steel pipe is closer to the gravity retaining wall than the second reinforcing steel pipe.

9. The excavation support structure of claim 1, wherein, The upper end of the gravity retaining wall is provided with a concrete reinforcing plate.

Images