Deep foundation pit support system and construction method

Abstract

The present application belongs to the technical field of building foundation pit construction, especially relates to a deep foundation pit support system and a construction method, and relates to a soil retaining plate for retaining and supporting the inner wall of a foundation pit. The side of the soil retaining plate away from the inner wall of the foundation pit is provided with a support frame, which comprises a containing part fixedly connected with the support frame; a telescopic part in sliding cooperation with the containing part, which can extend or contract towards the soil retaining plate; an ejection part in sliding cooperation with the telescopic part, which is used for supporting and ejecting the soil retaining plate; and a limiting part installed on the telescopic part, which is used for limiting and fastening the ejection part. The telescopic part in the containing part is driven to eject towards the soil retaining plate, and after abutting against the soil retaining plate, the abutting position is formed with a fixed-point support, thereby realizing the reinforcing and supporting effect on the local area of the foundation pit.

Description

Technical Field

[0001] This invention belongs to the field of foundation pit construction technology, and particularly relates to a deep foundation pit support system and construction method. Background Technology

[0002] With the continuous advancement of urbanization and the increase in urban building density, construction areas often involve complex geological conditions and dense surrounding pipelines and buildings, making foundation pit excavation prone to safety risks such as collapse and settlement. Therefore, deep foundation pit support construction has become a crucial link in ensuring project safety and the stability of the surrounding environment during the construction process, thus creating a demand for appropriate reinforcement and stability of the support system.

[0003] Existing deep foundation pit support systems typically achieve initial soil retention through the collaboration of retaining plates and support frames, with the reinforcement and support system of the foundation pit being specifically implemented by the support structure. For example, Chinese patent CN218204441U discloses a deep foundation pit support system, which consists of a support structure composed of components such as a pressing plate, a sliding plate, a hinge, and a force-applying plate. By driving the pressing plate, the sliding plate is displaced, causing the sliding plate and the hinge to move together, causing the force-applying plate, which is fixed to the hinge, to abut against the side of the retaining plate, thereby achieving a certain degree of reinforcement and support effect in the local area where the force-applying plate and the retaining plate abut.

[0004] However, the existing local support reinforcement methods still have obvious shortcomings: their support structure can only form contact with the retaining plate through local contact points, and cannot apply a comprehensive and uniform overall lateral support force to the retaining plate. The local support mode not only causes the force on the retaining plate to be concentrated in a limited contact area, but also makes it difficult to form a coordinated reinforcement effect across the entire area due to the dispersed local support, thus limiting the overall bearing capacity and structural stability of the support system. Summary of the Invention

[0005] The purpose of this invention is to provide a deep foundation pit support system and construction method, which can improve the reinforcement stability and the load-bearing capacity of the support system.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A deep foundation pit support system includes a retaining plate for retaining soil on the inner wall of the foundation pit, wherein a support frame is provided on the side of the retaining plate opposite to the inner wall of the foundation pit, comprising: A receiving element, which is fixedly connected to a support frame; The telescopic component is slidably engaged with the receiving component, and the telescopic component can extend or retract toward the retaining plate; The ejector component is slidably engaged with the telescopic component and is used to eject and support the retaining plate. A limiting member is installed on the telescopic member and is used to limit and fasten the ejector member. When the receiving member drives the telescopic member to extend toward the retaining plate, and the telescopic member abuts against the retaining plate, the ejector member is used to apply a lateral supporting force to the retaining plate as a whole.

[0007] Preferably, the accommodating member has a first cavity inside, and a first assembly opening is provided through one side wall of the first cavity along its own thickness direction. The first assembly opening is used for the telescopic member to pass through and be sleeved on the outside of the telescopic member, so that the telescopic member can slide along the extension direction of the first cavity.

[0008] Preferably, a first transmission pipe is provided on the side wall of the first cavity away from the first assembly port, and a second transmission pipe is provided on the side wall of the first cavity close to the first assembly port. Both the first transmission pipe and the second transmission pipe are used to transmit fluid media. When the first transmission pipe is supplied with fluid medium, the telescopic component is driven to extend toward the retaining plate; when the second transmission pipe is supplied with fluid medium, the telescopic component is driven to retract away from the retaining plate.

[0009] Preferably, the telescopic component includes a telescopic rod and a support rod, one end of the telescopic rod is fixedly connected to the side wall of the middle part of the support rod, and the axis of the telescopic rod is perpendicular to the axis of the support rod; The telescopic rod slides in conjunction with the receiving component, and the bearing rod can abut against the retaining plate.

[0010] Preferably, the telescopic rod has a second cavity inside, and the bearing rod has a third cavity inside, with the second cavity and the third cavity communicating with each other; The second cavity is provided with a first transmission port, and the side walls of the telescopic rod and the bearing rod are both provided with a third transmission pipe that is connected to each other. Both the first transmission port and the third transmission pipe are used to transmit fluid media. When the fluid medium is input into the third transmission pipe, the ejector is driven to provide lateral support to the retaining plate.

[0011] Preferably, the telescopic rod has an integrally formed raised groove on the outer side of the accommodating member, the outer wall of the raised groove is in contact with the inner wall of the accommodating member, and the raised groove is used to limit the sliding engagement of the telescopic rod inside the accommodating member.

[0012] Preferably, the side end of the bearing rod is provided with a second assembly port, which is used for the insertion of the top-out component.

[0013] Preferably, the ejector includes an ejector rod, which is slidably fitted inside the second assembly opening along the bearing rod. One end of the ejector rod is fixedly connected to an ejector block, which is used to apply lateral support force to the entire retaining plate.

[0014] Preferably, the limiting member includes a limiting seat, and the limiting seat is rotatably connected to an adjusting rod; When the limiting seat is installed on the side of the telescopic member close to the ejector, the adjusting rod is used to limit and fasten the ejector.

[0015] The present invention also proposes a construction method applicable to the above-mentioned deep foundation pit support system, comprising the following steps: S1. Level the construction site, carry out surveying and setting out work to ensure the excavation range and boundaries of the foundation pit; S2. Along the marked position of the excavation boundary of the foundation pit, vertically insert the retaining plate one by one to the preset depth; S3. Excavate the foundation pit in layers according to the design plan, and check the stress state of the retaining plate simultaneously during the excavation process; S4. Install the support frame at the preset points on the side of the retaining plate away from the foundation pit. S5. Install the receiving component on the support frame, and drive the telescopic component to extend along the direction of the retaining plate through the receiving component to form a fixed-point support force; S6. Subsequently, the ejector on the telescopic member ejects laterally along the retaining plate and extends to the end of the pit, thereby applying lateral support force to the retaining plate and forming an extension of the overall support. S7. The limiting member is used to limit and tighten the ejection position of the ejector to prevent the ejector from retracting and to ensure the lateral support of the support system is stable.

[0016] In summary, the technical effects and advantages of this invention are as follows: 1. The present invention pushes the telescopic component inside the drive housing toward the retaining plate. After the telescopic component abuts against the retaining plate, it forms a fixed-point support at the abutment position, thereby achieving the reinforcement and support effect on the local area of ​​the foundation pit.

[0017] 2. In this invention, after the telescopic component comes into contact with the retaining plate, the push-out component built into the telescopic component extends to both ends of the foundation pit along a direction perpendicular to the axis of the telescopic component, thereby applying lateral support force to the retaining plate, realizing the extension from fixed-point support to overall support, and significantly improving the overall bearing capacity and structural stability of the support system. Attached Figure Description

[0018] Figure 1 This is a flowchart of the construction method in this invention; Figure 2 This is a schematic diagram of the overall structure of the present invention; Figure 3This is an exploded view of the overall structure in this invention; Figure 4 This is a schematic diagram of the structure of the accommodating member, telescopic member, ejector member, and limiting member in this invention; Figure 5 This is a schematic diagram of the accommodating component structure in the present invention; Figure 6 This is a schematic diagram of the accommodating and telescopic components in this invention; Figure 7 This is a schematic diagram of the telescopic component structure in this invention; Figure 8 This is a schematic diagram of the telescopic component and the third transmission pipe in this invention; Figure 9 for Figure 8 Enlarged schematic diagram marked A; Figure 10 for Figure 8 Enlarged diagram marked B; Figure 11 This is a schematic diagram of the telescopic component and the ejector component in this invention; Figure 12 This is a schematic diagram of the ejector and limiting components in this invention.

[0019] In the diagram: 1. Excavation pit; 2. Retaining plate; 3. Support frame; 4. Receiving component; 41. First cavity; 42. First assembly port; 43. First transmission pipe; 44. Second transmission pipe; 45. Maintenance valve; 5. Telescopic component; 51. Telescopic rod; 511. Second cavity; 512. First transmission port; 513. Third transmission pipe; 514. First protrusion groove; 515. Limiting groove; 516. Second transmission port; 52. Bearing rod; 521. Third cavity; 522. Second assembly port; 523. Second protrusion groove; 524. Third transmission port; 6. Ejector component; 61. Ejector rod; 62. Ejector block; 611. Adjustment groove; 7. Limiting component; 71. Limiting seat; 72. Adjusting rod. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] like Figures 2-12As shown, a deep foundation pit support system includes retaining plates 2 for retaining soil on the inner wall of the foundation pit 1. The retaining plates 2 are rectangular flat plates with tongue-and-groove joints along their edges. Adjacent retaining plates 2 are connected by these joints to form a continuous retaining wall. A support frame 3 is provided on the side of the retaining plate 2 facing away from the inner wall of the foundation pit 1. The support frame 3 has a frame-like three-dimensional structure, formed by horizontal main beams, longitudinal secondary beams, and diagonal support rods, and includes: The receiving component 4 is a hollow three-dimensional structure. The bottom or top of the receiving component 4 is fixedly connected to the crossbeam of the support frame 3 by bolts.

[0022] The telescopic component 5 is a multi-segment rod-shaped combination structure. The axis of the telescopic component 5 is coaxial with that of the housing component 4. The internal cavities of the telescopic component 5 and the housing component 4 slide together along the axis. The telescopic component 5 can extend or retract in the direction of the retaining plate 2, and the axis always remains coincident during the extension and retraction process.

[0023] The ejector 6 and the telescopic member 5 slide together in the horizontal direction. After the ejector 6 extends, it can cover the lateral area of ​​the retaining plate 2 to form a surface covering support.

[0024] The limiting member 7 can be selectively installed in the preset installation position of the receiving member 4 or the telescopic member 5. When the limiting member 7 is installed in the receiving member 4, it achieves the limiting and fastening of the telescopic member 5 by engaging with the limiting structure of the telescopic member 5. When the limiting member 7 is installed in the telescopic member 5, it achieves the limiting and fastening of the ejector 6 by engaging with the adjusting groove 611 of the ejector 6.

[0025] When the receiving member 4 drives the telescopic member 5 to extend towards the retaining plate 2, until the telescopic member 5 abuts against the side of the retaining plate 2, the ejector 6 then pushes out horizontally to the side of the retaining plate 2, thereby applying a uniformly distributed support force to the overall side of the retaining plate 2.

[0026] like Figures 4-6 As shown, the accommodating member 4 has a first cavity 41 inside. The first cavity 41 is a cavity structure extending along the axis of the accommodating member 4. A first assembly port 42 is opened through one side wall of the first cavity 41 along its own thickness direction. The first assembly port 42 is located at the center of the end wall of the accommodating member 4 near the retaining plate 2. The diameter of the port is adapted to the outer wall size of the telescopic member 5, and is used for the telescopic member 5 to pass through and be sleeved on the outside of the telescopic member 5 so that the telescopic member 5 can slide along the extension direction of the first cavity 41.

[0027] A first transmission pipe 43 is provided on the side wall of the first cavity 41 away from the first assembly port 42. The first transmission pipe 43 penetrates vertically through the center of the side wall of the first cavity 41 away from the first assembly port 42. A second transmission pipe 44 is provided on the side wall of the first cavity 41 near the first assembly port 42. The second transmission pipe 44 penetrates the side wall of the first cavity 41 near the first assembly port 42.

[0028] Specifically, the openings of the first transmission pipe 43 and the second transmission pipe 44 both face the inside of the first cavity 41. The first transmission pipe 43 and the second transmission pipe 44 ensure that when the fluid medium is input, it can act on the end of the telescopic member 5 to form a driving force.

[0029] It is worth mentioning that when the first transmission pipe 43 inputs fluid medium, the fluid pressure can drive the telescopic member 5 to extend towards the retaining plate 2. During this process, the second transmission pipe 44 is simultaneously in the fluid medium output state. When the second transmission pipe 44 inputs fluid medium, the fluid pressure can drive the telescopic member 5 to retract away from the retaining plate 2. At this time, the first transmission pipe 43 switches to the fluid medium output state.

[0030] A maintenance valve 45 is fixedly connected to the outer wall of the accommodating component 4. The maintenance valve 45 is fixed to the outer wall of the accommodating component 4 and is connected to the inside of the first cavity 41. It is used for subsequent inspection, replacement and pressure regulation of the fluid medium inside the accommodating component 4.

[0031] like Figures 5-8 As shown, the telescopic component 5 includes a telescopic rod 51 and a bearing rod 52. One end of the telescopic rod 51 is fixedly connected to the side wall of the middle part of the bearing rod 52 by welding. The axis of the telescopic rod 51 is perpendicular to the axis of the bearing rod 52, forming a T-shaped force-bearing structure.

[0032] The telescopic rod 51 is slidably fitted with the receiving part 4. The outer diameter of the telescopic rod 51 is adapted to the inner diameter of the first cavity 41. The bearing rod 52 can abut against the retaining plate 2. The end face of the bearing rod 52 that contacts the retaining plate 2 is flattened to ensure a tight fit.

[0033] The telescopic rod 51 has a second cavity 511 inside, which extends through the telescopic rod 51 along its axial direction. The bearing rod 52 has a third cavity 521 inside, which extends through the bearing rod 52 along its axial direction. The second cavity 511 and the third cavity 521 are connected.

[0034] The second cavity 511 and the third cavity 521 are seamlessly connected at the connection node of the telescopic rod 51 and the bearing rod 52 through an internal connecting channel, ensuring smooth flow of the fluid medium, and the ejector 6 slides along the extension direction of the third cavity 521.

[0035] Specifically, the telescopic rod 51 is provided with a first transmission port 512. The first transmission port 512 is located at the center of the end face of the telescopic rod 51 near the receiving member 4. The first transmission port 512 is adapted to the internal channel of the first cavity 41. When the telescopic rod 51 slides in the receiving member 4, the first transmission port 512 always maintains the state of fluid medium flow with the inside of the first cavity 41.

[0036] Both the telescopic rod 51 and the support rod 52 have a third transmission pipe 513 connected to each other on their side walls. One end of the third transmission pipe 513 is fixedly connected to the side wall of the telescopic rod 51, and the other end extends to the side wall of the support rod 52. The internal channel of the third transmission pipe 513 is connected to both the second cavity 511 and the third cavity 521, forming a complete fluid transmission path. The fluid medium in the first cavity 41 and the second cavity 511 can flow through the first transmission port 512.

[0037] It should be noted that when the first transmission port 512 is input with fluid medium, the fluid pressure can drive the ejector 6 to provide lateral support to the retaining plate 2. During this process, the third transmission pipe 513 is simultaneously in the fluid medium output state. When the third transmission pipe 513 is input with fluid medium, the fluid pressure can drive the ejector 6 to retract in the direction away from the retaining plate 2. At this time, the first transmission port 512 switches to the fluid medium output state.

[0038] like Figures 8-10 As shown, the telescopic rod 51 has a first protruding groove 514 integrally formed on the outer wall side near the receiving part 4. The protrusion height of the first protruding groove 514 is adapted to the inner wall of the receiving part 4. The first protruding groove 514 is an annular protruding groove structure. One side of the first protruding groove 514 is close to the bottom of the outer wall of the telescopic rod 51. The outer wall of the first protruding groove 514 fits against the inner wall of the receiving part 4. The first protruding groove 514 is used for sliding cooperation of the telescopic rod 51 inside the receiving part 4.

[0039] The outer wall of the first protrusion groove 514 is provided with a sealing gasket. The sealing gasket can cover the contact surface between the first protrusion groove 514 and the inner wall of the accommodating member 4 to prevent fluid medium leakage.

[0040] A limiting groove 515 is fixedly connected to the outer side of the telescopic rod 51. The limiting groove 515 is used to guide and limit the sliding fit of the telescopic rod 51 inside the receiving part 4, limiting the maximum axial stroke of the telescopic rod 51. One side of the limiting groove 515 can abut against the first assembly port 42, and the other side of the limiting groove 515 is close to the first protrusion groove 514. The width of the limiting groove 515 is slightly larger than the first assembly port 42.

[0041] Specifically, when the telescopic rod 51 extends to its maximum stroke, the side wall of the limiting groove 515 near the first assembly port 42 can tightly abut against the end face of the first assembly port 42 to prevent the telescopic rod 51 from coming out of the first cavity 41.

[0042] A second transmission port 516 is provided in the middle of the limiting groove 515. One end of the second transmission port 516 is connected to the internal channel of the third transmission pipe 513, and the other end of the second transmission port 516 extends through the inner wall of the telescopic rod 51. The second transmission port 516 can transmit the fluid medium of the third transmission pipe 513 to the inside of the first cavity 41, and the second transmission pipe 44 realizes the input or output of the fluid medium.

[0043] The side end of the support rod 52 is provided with a second mounting port 522. The second mounting port 522 is opened at the center of the end of the support rod 52 away from the telescopic rod 51. The second mounting port 522 is adapted to the outer diameter of the ejector 6.

[0044] A sealing gasket is embedded in the inner wall of the second assembly port 522. The sealing gasket fits between the inner wall of the second assembly port 522 and the outer wall of the ejector 6, which can fill the gap between the two, effectively block the leakage path of the fluid medium inside the third cavity 521, and reduce friction loss when the ejector 6 slides and extends, so as to avoid the transmission of driving force of the ejector 6 due to medium leakage.

[0045] The third cavity 521 has a second protrusion groove 523 inside, which is close to the second assembly port 522.

[0046] A third transmission port 524 is provided between the second assembly port 522 and the second protrusion groove 523. The third transmission port 524 is opened on the end face of the second protrusion groove 523 near the second assembly port 522. The third transmission port 524 is connected to the internal channel of the third transmission pipe 513. The third transmission port 524 can transmit the fluid medium of the third transmission pipe 513 to the inside of the third cavity 521, providing driving force for the sliding of the ejector 6.

[0047] like Figures 11-12 As shown, the ejector 6 includes an ejector rod 61. The outer wall of the ejector rod 61 is fitted with a sealing gasket on the inner wall of the third cavity 521. The ejector rod 61 passes through the second assembly port 522 and slides along the inside of the bearing rod 52.

[0048] One end of the ejector rod 61 is fixedly connected to an ejector block 62. The ejector block 62 is fixedly connected to the end of the ejector rod 61 by welding. The ejector block 62 is used to apply lateral support force to the entire retaining plate 2. The ejector block 62 is a rectangular block structure. The end face of the ejector rod 61 is flattened to ensure full contact with the outer wall of the retaining plate 2. The area of ​​the ejector block 62 is adapted to the local stress surface of the retaining plate 2, so that the driving force of the ejector rod 61 can be evenly transmitted to the retaining plate 2.

[0049] Specifically, the outer wall of the ejector rod 61 is provided with an adjustment groove 611. The adjustment groove 611 is a groove structure opened along the outer wall of the ejector rod 61. The groove shape of the adjustment groove 611 is adapted to the end of the limiting member 7 to ensure that the limiting member 7 can be inserted and form a stable limit.

[0050] The limiting component 7 includes a limiting seat 71, which is a block structure. An adjusting rod 72 is rotatably connected to the limiting seat 71. A threaded hole adapted to the adjusting rod 72 is opened inside the limiting seat 71. The adjusting rod 72 passes through the threaded hole and forms a rotatable connection structure with the limiting seat 71 through a threaded engagement.

[0051] In this embodiment, when the limiting seat 71 is fixedly installed on the outer wall of the bearing rod 52 near the second assembly port 522, one end of the adjusting rod 72 can extend to the inner side of the limiting seat 71. The adjusting rod 72 is screwed so that its end is engaged with the adjusting groove 611 of the ejector rod 61. The threaded locking force forms a limiting fastening, thereby fixing the position of the ejector rod 61.

[0052] Furthermore, the limiting seat 71 can be installed on the receiving member 4. When the limiting seat 71 is fixedly installed on the outer wall of the receiving member 4 near the first assembly port 42, one end of the adjusting rod 72 can extend to the inner side of the limiting seat 71. Tighten the adjusting rod 72 so that its end is engaged with the telescopic rod 51. The limiting fastening is formed by the threaded locking force, and the position of the telescopic rod 51 is fixed.

[0053] like Figures 1-12 As shown, this section details the construction method and steps using the deep foundation pit support system of the present invention: S1. Level the construction site, carry out surveying and setting out work to ensure the excavation range and boundaries of foundation pit 1.

[0054] S2. Along the excavation boundary of the foundation pit 1, vertically insert the retaining plate 2 one by one to the preset depth. The insertion direction of the retaining plate 2 is perpendicular to the ground. The lower part of the retaining plate 2 is embedded in the underground soil, and the upper part protrudes from the ground at a certain height. Adjacent retaining plates 2 are connected by tongue and groove splicing.

[0055] S3. The foundation pit 1 is excavated in a layered and progressive manner to avoid soil instability caused by excavating too deeply at once. The stress state of the retaining plate 2 is checked simultaneously during the excavation process.

[0056] S4. On the side of the retaining plate 2 away from the pit 1, install the support frame 3 at the preset points. The preset points are the connection positions of the side of the retaining plate 2 away from the pit 1 and the subsequent installation of the receiving component 4.

[0057] S5. First, install the receiving component 4 on the support frame 3. During installation, ensure that the output end of the receiving component 4 is aligned with the connection end of the telescopic component 5, and at the same time ensure that the output end of the receiving component 4 faces the bearing surface of the retaining plate 2. Then, the fluid medium is delivered into the first cavity 41 through the first transmission pipe 43 of the receiving component 4. Under the continuous action of the medium pressure, the telescopic component 5 is pushed out smoothly towards the retaining plate 2, so that the telescopic component 5 and the retaining plate 2 form a stable fixed-point support.

[0058] S6. Further, the fluid medium is input into the second cavity 511 and the third cavity 521 through the first transmission port 512 of the telescopic member 5. Driven by the medium pressure, the ejector 6 extends directionally along the tangential direction of the wall surface of the retaining plate 2 until the ejector 6 extends to the preset support position at the end of the pit 1. Through the tight contact between the ejector 6 and the wall surface of the retaining plate 2, the ejector 6 applies a lateral support force to the retaining plate 2 evenly, thereby realizing the dynamic extension of the support range from local contact to full coverage at the end of the pit 1, and finally forming a continuous and reliable lateral support system.

[0059] S7. Subsequently, the limiting member 7 limits and tightens the ejection positions of the ejector 6 and the telescopic member 5 respectively. The threaded fastening prevents the ejector 6 and the telescopic member 5 from retracting under stress, ensuring that the lateral support of the entire support system remains stable.

[0060] It should be noted that after the support operation is completed, the second transmission pipe 44 of the accommodating member 4 switches to the fluid medium input state. The fluid medium is continuously injected into the first cavity 41 through the second transmission pipe 44. At the same time, the second transmission port 516 simultaneously starts the fluid transmission function, transmitting the fluid medium input by the second transmission pipe 44 along the third transmission pipe 513 to the third transmission port 524, and then introducing it into the third cavity 521 through the third transmission port 524. Driven by the reverse fluid pressure, the ejector 6 retracts along the extension direction of the third cavity 521 in the direction away from the retaining plate 2 until the ejector 6 retracts into the third cavity 521, and the retraction operation of the ejector 6 is completed.

[0061] When the ejector 6 retracts into place, the fluid medium continuously input by the second transmission pipe 44 forms a sufficient reverse thrust inside the first cavity 41. This thrust drives the telescopic member 5 to reset in the direction away from the retaining plate 2. The telescopic member 5 retracts into the first cavity 41, completing the overall reset action.

[0062] At the same time, during the retraction of the ejector 6 and the resetting of the telescopic component 5, the fluid medium originally used to provide support force in the second cavity 511 and the third cavity 521 are synchronously switched to the output state. The fluid medium is discharged through the first transmission port 512, flows into the first cavity 41 through the communication channel between the first transmission port 512 and the first cavity 41, and is centrally output through the first transmission pipe 43 to complete the resetting of the entire support system.

[0063] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A deep foundation pit support system, comprising a retaining plate for retaining soil on the inner wall of the foundation pit, wherein a support frame is provided on the side of the retaining plate opposite to the inner wall of the foundation pit, characterized in that, include: A receiving element, which is fixedly connected to a support frame; The telescopic component is slidably engaged with the receiving component, and the telescopic component can extend or retract toward the retaining plate; The ejector component is slidably engaged with the telescopic component and is used to eject and support the retaining plate. A limiting member is installed on the telescopic member and is used to limit and fasten the ejector member. When the receiving member drives the telescopic member to extend toward the retaining plate, and the telescopic member abuts against the retaining plate, the ejector member is used to apply a lateral supporting force to the retaining plate as a whole.

2. The deep foundation pit support system according to claim 1, characterized in that, The accommodating member has a first cavity inside, and a first assembly opening is provided through one side wall of the first cavity along its own thickness direction. The first assembly opening is used for the telescopic member to pass through and be sleeved on the outside of the telescopic member, so that the telescopic member can slide along the extension direction of the first cavity.

3. The deep foundation pit support system according to claim 2, characterized in that, The first cavity is provided with a first transmission pipe on the side wall away from the first assembly port, and a second transmission pipe is provided on the side wall of the first cavity close to the first assembly port. Both the first transmission pipe and the second transmission pipe are used to transmit fluid media. When the first transmission pipe is supplied with fluid medium, the telescopic component is driven to extend toward the retaining plate; when the second transmission pipe is supplied with fluid medium, the telescopic component is driven to retract away from the retaining plate.

4. The deep foundation pit support system according to claim 1, characterized in that, The telescopic component includes a telescopic rod and a load-bearing rod. One end of the telescopic rod is fixedly connected to the side wall of the middle part of the load-bearing rod, and the axis of the telescopic rod is perpendicular to the axis of the load-bearing rod. The telescopic rod slides in conjunction with the receiving component, and the bearing rod can abut against the retaining plate.

5. A deep foundation pit support system according to claim 4, characterized in that, The telescopic rod has a second cavity inside, and the bearing rod has a third cavity inside, with the second cavity and the third cavity connected together; The second cavity is provided with a first transmission port, and the side walls of the telescopic rod and the bearing rod are both provided with a third transmission pipe that is connected to each other. Both the first transmission port and the third transmission pipe are used to transmit fluid media. When the fluid medium is input into the third transmission pipe, the ejector is driven to provide lateral support to the retaining plate.

6. A deep foundation pit support system according to claim 4, characterized in that, The telescopic rod has an integrally formed raised groove on the outer side of the accommodating part. The outer wall of the raised groove fits against the inner wall of the accommodating part. The raised groove is used to limit the sliding fit of the telescopic rod inside the accommodating part.

7. A deep foundation pit support system according to claim 4, characterized in that, The side end of the bearing rod is provided with a second assembly port, which is used for the insertion of the ejector component.

8. A deep foundation pit support system according to claim 1 or 7, characterized in that, The ejector includes an ejector rod, which is slidably fitted inside the second assembly opening along the bearing rod. One end of the ejector rod is fixedly connected to an ejector block, which is used to apply lateral support force to the entire retaining plate.

9. A deep foundation pit support system according to claim 1, characterized in that, The limiting component includes a limiting seat, and the limiting seat is rotatably connected to an adjusting rod; When the limiting seat is installed on the side of the telescopic member close to the ejector, the adjusting rod is used to limit and fasten the ejector.

10. A construction method applicable to the deep foundation pit support system according to any one of claims 1-9, characterized in that, The steps include the following: S1. Level the construction site, carry out surveying and setting out work to ensure the excavation range and boundaries of the foundation pit; S2. Along the marked position of the excavation boundary of the foundation pit, vertically insert the retaining plate one by one to the preset depth; S3. Excavate the foundation pit in layers according to the design plan, and check the stress state of the retaining plate simultaneously during the excavation process; S4. Install the support frame at the preset points on the side of the retaining plate away from the foundation pit. S5. Install the receiving component on the support frame, and drive the telescopic component to extend along the direction of the retaining plate through the receiving component to form a fixed-point support force; S6. Subsequently, the ejector on the telescopic member ejects laterally along the retaining plate and extends to the end of the pit, thereby applying lateral support force to the retaining plate and forming an extension of the overall support. S7. The limiting member is used to limit and tighten the ejection position of the ejector to prevent the ejector from retracting and to ensure the lateral support of the support system is stable.

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