Composite supporting structure close to structure bearing platform foundation pit in deep and thick silt layer

Abstract

The utility model relates to a deep and thick silt layer close structure bearing platform foundation pit composite supporting structure which comprises an inner support, a connecting piece is welded to the top of the inner support, a steel sheet pile is welded to the inner wall of the connecting piece, a bracket is welded to the bottom of the inner support, and the side, away from the inner support, of the bracket is welded to the side face of the steel sheet pile. An extrusion device is arranged on the side face of the steel sheet pile and comprises an L-shaped fixing plate, the side face of the L-shaped fixing plate is fixedly connected to the side face of the steel sheet pile, and an electric telescopic rod is fixedly connected to the inner wall of the L-shaped fixing plate. The supporting structure solves the problems that if the supporting structure encounters loose soil during installation, the fixing and supporting capacity of the loose soil on the supporting structure is poor, displacement, inclination or damage of the supporting structure are possibly caused, and normal use and bearing capacity of the supporting structure are affected, and therefore the effect of stably installing the supporting structure is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of supporting structures, and in particular relates to a composite supporting structure for a foundation pit of a cap adjacent to a structure in a thick silt layer. Background Art

[0002] When excavating the foundation pit of the pedestal under the thick silt layer near the structure, the silt at the bottom of the foundation pit will produce a large unbalanced earth pressure under the gravity of the nearby structure, and it is easy to cause base uplift. In order to ensure the safety and economy of the foundation pit construction near the structure, effective measures need to be taken to reduce the settlement and horizontal displacement of the structure and the soil beside the foundation pit during the construction of the foundation pit.

[0003] Patent CN113668553A with patent announcement number discloses a composite support structure for a foundation pit adjacent to a building, including a front row of piles and a rear row of piles, wherein the front row of piles and the rear row of piles are respectively arranged on one side of the engineering piles at the bottom of the building, and a half-slope pile is arranged on the upper part of the rear row of piles, a rear row of pile top crown beam is fixed on one side of the half-slope pile, a fixing piece is arranged on one side of the rear row of pile top crown beam, the fixing piece passes through the half-slope pile and a fixing structure is arranged at the end, the fixing structure is fixed to the rear row of piles, and a front row of pile top crown beam is arranged on the upper part of the front row of piles. The invention has good structural integrity, very large rigidity and strength, and can control the deformation of the foundation pit within a very small range. Therefore, the foundation pit project adjacent to the building has a support structure with high strength and rigidity, which is not only suitable for the support of deep foundation pits of more than eight meters, but also can control the deformation of the foundation pit within an allowable range, thereby ensuring the safety of the building on the pit top.

[0004] However, the current support structure has the following problems:

[0005] For the excavation of the foundation pit of the pedestal under the thick silt layer adjacent to the structure, the silt at the bottom of the foundation pit produces a large unbalanced earth pressure under the gravity of the adjacent structure, and is prone to base uplift. The loose soil has poor fixation and support capabilities for the support structure, which may cause the support structure to shift, tilt or be damaged, affecting its normal use and bearing capacity. Therefore, we proposed a composite support structure for the foundation pit of the pedestal adjacent to the structure in the thick silt layer. Utility Model Content

[0006] The purpose of the utility model is to provide a composite support structure for a foundation pit of a structure adjacent to a thick silt layer, which can solve the problem in the related technology that if the support structure encounters loose soil during installation, the loose soil has poor fixing and supporting capabilities for the support structure, which may cause the support structure to shift, tilt or be damaged, affecting its normal use and bearing capacity.

[0007] The technical solution adopted by the utility model is as follows:

[0008] A composite supporting structure for a foundation pit of a structure adjacent to a thick silt layer comprises an inner support, a connecting piece welded on the top of the inner support, a steel sheet pile welded on the inner wall of the connecting piece, a corbel welded on the bottom of the inner support, a side of the corbel away from the inner support is welded on the side of the steel sheet pile, an extrusion device is arranged on the side of the steel sheet pile, the extrusion device comprises an L-shaped fixing plate, the side of the L-shaped fixing plate is fixedly connected to the side of the steel sheet pile, an electric telescopic rod is fixedly connected to the inner wall of the L-shaped fixing plate, a moving block is fixedly connected to the telescopic end of the electric telescopic rod, an arc-shaped spring piece is fixedly connected to the bottom of the moving block, a supporting block is fixedly connected to the bottom of the arc-shaped spring piece, a track groove is opened on the side of the steel sheet pile, a U-shaped block is slidably connected to the inner wall of the track groove, and an extrusion plate is fixedly connected to the inner wall of the U-shaped block.

[0009] The side surface of the extrusion plate contacts the side surface of the steel sheet pile, and the extrusion plate is located on the displacement track of the arc surface of the arc-shaped spring piece.

[0010] The L-shaped fixing plate is located above the extrusion plate, and the moving block is located on the side of the extrusion plate.

[0011] An auxiliary device is provided at the bottom of the moving block, and the auxiliary device includes a hinged rod, one end of the hinged rod is hinged at the bottom of the moving block, the other end of the hinged rod is hinged with a knocking rod, a sliding block is fixedly connected to the side of the knocking rod, and a sliding groove is provided on the side of the steel sheet pile for sliding connection of the sliding block.

[0012] The arc-shaped spring piece is located on the displacement track of the knocking rod, and the sliding groove is located on the side of the arc-shaped spring piece.

[0013] The knocking rod is located between the moving block and the supporting block, and the side surface of the hinged rod is in contact with the side surface of the steel sheet pile.

[0014] The technical effects achieved by the utility model are:

[0015] The utility model arranges the extrusion device so that the electric telescopic rod, the moving block, the arc-shaped spring piece, the track groove, the U-shaped block and the extrusion plate cooperate with each other, so that the deformed part of the arc-shaped spring piece pushes the extrusion plate to move in the track groove through the U-shaped block, so that the extrusion plate squeezes the loose soil, thereby increasing the density of the soil and the stability of the structure, and being able to more effectively bear the load from the foundation pit and the supporting structure.

[0016] The utility model arranges an auxiliary device to coordinate the hinged rod, the knocking rod, the arc-shaped spring piece and the extrusion plate, so that the movement of the knocking rod will knock the arc-shaped spring piece, thereby transmitting the vibration force to the extrusion plate through the arc-shaped spring piece, so that the extrusion plate vibrates when extruding soil, which can accelerate the soil extrusion process and make the extrusion effect more uniform and thorough, so as to achieve the soil density required by the design in a shorter time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the utility model as a whole;

[0018] Figure 2 It is a schematic diagram of the structure of the steel sheet pile of the utility model;

[0019] Figure 3 It is a schematic diagram of the structure of the arc-shaped spring piece of the utility model;

[0020] Figure 4 This utility model Figure 3 Schematic diagram of the structure at A in the middle;

[0021] Figure 5 This utility model Figure 3 Schematic diagram of the structure at position B in FIG.

[0022] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0023] 1. Inner support; 2. Connecting piece; 3. Steel sheet pile; 4. Corbel; 5. Extrusion device; 6. Auxiliary device; 51. L-shaped fixing plate; 52. Electric telescopic rod; 53. Moving block; 54. Arc-shaped spring piece; 55. Support block; 56. Track groove; 57. U-shaped block; 58. Extrusion plate; 61. Articulated rod; 62. Knocking rod; 63. Sliding block; 64. Sliding groove. DETAILED DESCRIPTION

[0024] In order to make the purpose and advantages of the utility model more clear, the utility model is specifically described in combination with the following embodiments. It should be understood that the following text is only used to describe one or several specific implementations of the utility model, and does not strictly limit the protection scope of the specific request of the utility model.

[0025] like Figure 1-5As shown, a composite support structure for a foundation pit of a structure with a thick silt layer adjacent to the foundation, comprises an inner support 1, a connector 2 is welded on the top of the inner support 1, a steel sheet pile 3 is welded on the inner wall of the connector 2, a corbel 4 is welded on the bottom of the inner support 1, and the side of the corbel 4 away from the inner support 1 is welded to the side of the steel sheet pile 3, the corbel 4 can further fix the steel sheet pile 3 and the inner support 1, and an extrusion device 5 is arranged on the side of the steel sheet pile 3, the extrusion device 5 comprises an L-shaped fixing plate 51, the side of the L-shaped fixing plate 51 is fixedly connected to the side of the steel sheet pile 3, the inner wall of the L-shaped fixing plate 51 is fixedly connected to an electric telescopic rod 52, and the telescopic end of the electric telescopic rod 52 is fixedly connected to a moving block 53, The movement of the moving block 53 will squeeze the arc-shaped spring piece 54, and the arc-shaped spring piece 54 will be deformed after being squeezed. The bottom of the moving block 53 is fixedly connected with the arc-shaped spring piece 54, and the bottom of the arc-shaped spring piece 54 is fixedly connected with the supporting block 55. The deformed part of the arc-shaped spring piece 54 will push the extrusion plate 58 to move in the track groove 56 through the U-shaped block 57. The side of the steel sheet pile 3 is provided with a track groove 56, and the inner wall of the track groove 56 is slidably connected with the U-shaped block 57. The inner wall of the U-shaped block 57 is fixedly connected with the extrusion plate 58. The extrusion plate 58 squeezes the loose soil, thereby increasing the density of the soil and the stability of the structure, and can more effectively withstand the load from the foundation pit and the supporting structure.

[0026] The side of the extrusion plate 58 contacts the side of the steel sheet pile 3, and the extrusion plate 58 is located on the displacement trajectory of the arc surface of the arc spring piece 54. In this way, the arc spring piece 54 can push the extrusion plate 58 during the deformation process, thereby achieving the effect of moving the extrusion plate 58.

[0027] The L-shaped fixing plate 51 is located above the pressing plate 58 , and the moving block 53 is located on the side of the pressing plate 58 .

[0028] According to the above structure, when the supporting structure is placed inside the foundation pit, loose soil may be encountered. The loose soil has poor fixing and supporting capabilities for the supporting structure, which may cause displacement, tilting or damage to the supporting structure, affecting its normal use and bearing capacity. Therefore, the electric telescopic rod 52 is started, and the telescopic end of the electric telescopic rod 52 pushes the moving block 53. The moving block 53 moves due to the thrust. The movement of the moving block 53 squeezes the arc-shaped spring piece 54. The arc-shaped spring piece 54 is deformed after being squeezed. The deformed part of the arc-shaped spring piece 54 pushes the extrusion plate 58 to move in the track groove 56 through the U-shaped block 57, so that the extrusion plate 58 squeezes the loose soil, thereby increasing the density of the soil and the stability of the structure, and being able to more effectively withstand the load from the foundation pit and the supporting structure.

[0029] like Figure 1-5As shown, an auxiliary device 6 is provided at the bottom of the moving block 53, and the auxiliary device 6 includes a hinged rod 61, one end of which is hinged at the bottom of the moving block 53, and the moving block 53 will push the knocking rod 62 to move through the hinged rod 61, and the other end of the hinged rod 61 is hinged with the knocking rod 62, and the movement of the knocking rod 62 will knock the arc-shaped spring piece 54, so as to transmit the vibration force to the extrusion plate 58 through the arc-shaped spring piece 54, and the side of the knocking rod 62 is fixedly connected with a slider 63, and the side of the steel sheet pile 3 is provided with a slide groove 64 for sliding connection with the slider 63, and the slide groove 64 is used to limit the moving range of the knocking rod 62.

[0030] The arc-shaped spring piece 54 is located on the displacement track of the knocking rod 62 . The knocking rod 62 knocks the arc-shaped spring piece 54 , and transmits the vibration force to the extrusion plate 58 through the arc-shaped spring piece 54 . The slide groove 64 is located on the side of the arc-shaped spring piece 54 .

[0031] The knocking rod 62 is located between the moving block 53 and the supporting block 55 , and the side surface of the hinge rod 61 is in contact with the side surface of the steel sheet pile 3 .

[0032] According to the above structure, the movement of the moving block 53 will push the knocking rod 62 to move through the hinged rod 61, and the movement of the knocking rod 62 will knock the arc-shaped spring piece 54, so that the vibration force is transmitted to the extrusion plate 58 through the arc-shaped spring piece 54, so that the extrusion plate 58 vibrates when extruding the soil, which can accelerate the soil extrusion process and make the extrusion effect more uniform and thorough, so as to achieve the designed soil density in a shorter time.

[0033] The above are only preferred embodiments of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be considered as the scope of protection of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to conventional means in the art unless otherwise specified or limited.

Claims

1. A composite support structure for a foundation pit of a structure adjacent to a thick silt layer, comprising an inner support (1), a connecting piece (2) welded to the top of the inner support (1), a steel sheet pile (3) welded to the inner wall of the connecting piece (2), a bracket (4) welded to the bottom of the inner support (1), and a side of the bracket (4) away from the inner support (1) is welded to the side of the steel sheet pile (3), characterized in that: A squeezing device (5) is provided on the side of the steel sheet pile (3), and the squeezing device (5) comprises an L-shaped fixing plate (51), the side of the L-shaped fixing plate (51) is fixedly connected to the side of the steel sheet pile (3), the inner wall of the L-shaped fixing plate (51) is fixedly connected to an electric telescopic rod (52), the telescopic end of the electric telescopic rod (52) is fixedly connected to a moving block (53), the bottom of the moving block (53) is fixedly connected to an arc-shaped spring sheet (54), the bottom of the arc-shaped spring sheet (54) is fixedly connected to a supporting block (55), and a track groove (56) is provided on the side of the steel sheet pile (3), the inner wall of the track groove (56) is slidably connected to a U-shaped block (57), and the inner wall of the U-shaped block (57) is fixedly connected to a squeezing plate (58).

2. The composite support structure for foundation pit of a structure adjacent to a thick silt layer according to claim 1 is characterized by: The side surface of the extrusion plate (58) contacts the side surface of the steel sheet pile (3), and the extrusion plate (58) is located on the displacement track of the arc surface of the arc-shaped spring sheet (54).

3. The composite support structure for foundation pit of a building foundation adjacent to a thick silt layer according to claim 2 is characterized by: The L-shaped fixing plate (51) is located above the extrusion plate (58), and the moving block (53) is located on the side of the extrusion plate (58).

4. The composite support structure for foundation pit of a structure adjacent to a thick silt layer according to claim 3 is characterized by: An auxiliary device (6) is provided at the bottom of the moving block (53), and the auxiliary device (6) comprises a hinged rod (61), one end of the hinged rod (61) is hinged to the bottom of the moving block (53), the other end of the hinged rod (61) is hinged to a knocking rod (62), a side of the knocking rod (62) is fixedly connected to a sliding block (63), and a side of the steel sheet pile (3) is provided with a sliding groove (64) for sliding connection of the sliding block (63).

5. The composite supporting structure for foundation pit of a structure adjacent to a thick silt layer according to claim 4 is characterized by: The arc-shaped spring piece (54) is located on the displacement track of the knocking rod (62), and the sliding groove (64) is located on the side of the arc-shaped spring piece (54).

6. The composite support structure for foundation pit of a structure adjacent to a thick silt layer according to claim 5 is characterized by: The knocking rod (62) is located between the moving block (53) and the supporting block (55), and the side surface of the hinged rod (61) is in contact with the side surface of the steel sheet pile (3).

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