Device for releasing buoyancy of bottom plate of underground structure

Abstract

The utility model relates to the technical field of foundation pit engineering, in particular to a device for releasing buoyancy of a bottom plate of an underground structure, which is mounted on the inner side of the bottom of an enclosure structure and comprises a ring beam, the periphery of the ring beam is attached to the inner side face of the enclosure structure, and a plurality of water seepage pipes are mounted in an opening in the inner side of the ring beam; wherein the ring beam is of a hollow structure, the water seepage pipe is communicated with the hollow structure, at least one water conveying pipe is communicated with the upper portion of the ring beam, the ring beam is adopted for supporting the bottom of the inner side of the enclosure structure, deformation of the enclosure structure can be effectively prevented, and meanwhile when the pressure in a foundation pit is too large, the water seepage pipe is not prone to deformation. As the water conveying pipe, the ring beam and the water seepage pipe are sequentially communicated, liquid in the foundation pit can be transferred to the ground surface to be discharged, the bottom deformation of the enclosure structure is limited, meanwhile, pressure relief can be conducted on the bottom of the foundation pit, buoyancy of a foundation floor when the underground water level rises is released, pressure balance of a soil body and a building foundation is maintained, and energy conservation and environmental protection are achieved.

Description

Technical Field

[0001] This utility model relates to the field of foundation pit engineering technology, and in particular to a device for releasing the buoyancy of the bottom plate of an underground structure. Background Technology

[0002] In geotechnical engineering, particularly in foundation pit engineering, soil excavation leads to the release of stress in the ground at the pit bottom, resulting in uneven rebound deformation. As the excavation depth increases, the difference in soil surface height between the inside and outside of the pit continuously widens. The resulting load, along with various ground overloads, causes the soil outside the retaining wall to move into the pit. This process leads to upward plastic bulging at the bottom of the pit and the formation of a large plastic zone around the pit, causing ground settlement.

[0003] After the foundation pit is excavated, the bottom of the diaphragm wall will experience displacement and deformation under the action of lateral water and soil pressure. The soil on the inner and outer sides of the corners of the wall will also undergo plastic deformation, resulting in soil heave. The rebound at the bottom of the pit is distributed in an arch shape, with the maximum and minimum rebound located at the center of the foundation pit and near the retaining wall, respectively.

[0004] In soft plastic geological engineering, foundation heave is particularly common. This is mainly due to excessive groundwater pressure, which causes the retaining system to exert buoyancy on the soil at the bottom of the pit, leading to foundation heave. In water-rich areas, rainfall can raise the groundwater level, further increasing groundwater pressure. To prevent foundation heave and shear cracking of existing building foundations, current methods mainly include dewatering, foundation reinforcement, and grouting to reduce water pressure within the engineering area.

[0005] However, existing operating methods have many inconveniences and cannot achieve integrated operation of the foundation pit retaining structure and drainage. This not only affects the efficiency of the project but also increases project costs and safety hazards. Utility Model Content

[0006] The purpose of this invention is to address the aforementioned shortcomings in the existing technology by proposing a device for releasing the buoyancy of the foundation slab of an underground structure.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] Design a device to release the buoyancy of the bottom slab of an underground structure. The device is installed on the inner side of the bottom of the retaining structure and includes a ring beam. The outer periphery of the ring beam is attached to the inner side of the retaining structure, and several seepage pipes are installed in the inner opening of the ring beam.

[0009] The ring beam is a hollow structure, the seepage pipe is connected to the hollow structure, and at least one water supply pipe is connected above the ring beam. The top end of the water supply pipe extends to the ground surface and is connected to a pump.

[0010] Furthermore, it also includes a protective structure installed in the opening of the ring beam, the protective structure protecting both sides of the seepage pipe.

[0011] Furthermore, the protective structure includes two grid plates, which are respectively attached to the upper and lower sides of the seepage pipe;

[0012] A connecting structure is provided between the two of the grating plates.

[0013] Furthermore, the connection structure includes a plurality of guide posts fixed on the lower grating plate, and holes adapted to the guide posts are provided on the end face of the upper grating plate.

[0014] The top of the guide post is provided with a deformation opening along the radial direction, and the guide post is also provided with claws on both sides of the deformation opening.

[0015] Furthermore, a support frame is fixedly installed on the top of the ring beam, and the support frame is sleeved on the outside of the water supply pipe.

[0016] The support frame is composed of multiple tubular components, each of which has an inwardly recessed portion at its bottom that matches its upper opening.

[0017] Furthermore, a fixing plate is fixedly installed on the inner side of the retracted part, and the middle of the fixing plate has a through hole for the water pipe to pass through. Positioning glass beads are embedded on both sides of the fixing plate, and the telescopic ends of the positioning glass beads pass through the retracted part and the outer pipe.

[0018] Furthermore, several pressure sensors are installed at the bottom of the ring beam, and these pressure sensors are connected to an external control unit via wires.

[0019] The present invention proposes a device for releasing the buoyancy of the bottom slab of an underground structure. The beneficial effects are as follows: By using a ring beam to support the inner bottom of the retaining structure, the deformation of the retaining structure can be effectively prevented. At the same time, when the pressure in the foundation pit is too high, a water supply pipe can be pumped out through a pump. Since the water supply pipe, the ring beam, and the seepage pipe are connected in sequence, the liquid in the foundation pit can be transferred to the surface for discharge. While limiting the deformation of the retaining structure, the pressure at the bottom of the foundation pit can be relieved, the buoyancy of the bottom slab can be released, and the soil arching phenomenon can be prevented. In turn, the pressure balance between the soil and the building foundation is maintained, which is green, energy-saving, and environmentally friendly. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the installation of the ring beam of this utility model in the enclosure structure;

[0021] Figure 2 This is a schematic diagram of the ring beam structure of this utility model;

[0022] Figure 3 This is a schematic diagram of the protective structure of this utility model;

[0023] Figure 4 This is a schematic diagram of the pipe fitting structure of this utility model;

[0024] Figure 5 This is a schematic diagram of the fixing plate structure of this utility model;

[0025] Figure 6 This is a schematic diagram of the pressure sensor structure of this utility model.

[0026] In the diagram: 1. Enclosure structure; 2. Ring beam; 3. Drainage pipe; 4. Water supply pipe; 5. Protective structure; 51. Grating plate; 52. Guide post; 53. Deformation opening; 54. Claw; 6. Support frame; 61. Pipe fitting; 62. Recessed part; 63. Fixing plate; 64. Positioning glass bead; 65. Through hole; 7. Pressure sensor. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0028] Reference Figure 1-6 In one embodiment of this utility model, a device for releasing the buoyancy of the bottom slab of an underground structure is disclosed. The device is installed on the inner side of the bottom of the retaining structure 1. Specifically, the device includes a ring beam 2. In this embodiment, the ring beam 2 is set as a reinforced concrete hollow ring beam. It is attached to the inner side of the retaining structure 1 to limit the deformation of the bottom of the foundation pit enclosure and subsequent water conveyance. The outer periphery of the ring beam 2 is attached to the inner side of the retaining structure 1. A plurality of seepage pipes 3 are installed in the inner opening of the ring beam 2. A plurality of water inlet holes are opened on the outer periphery of the seepage pipes 3 so that water can enter the interior of the ring beam 2 along the seepage pipes 3.

[0029] The ring beam 2 is a hollow structure, and the seepage pipe 3 is connected to the hollow structure. At least one water supply pipe 4 is connected above the ring beam 2. The top end of the water supply pipe 4 extends to the ground surface and is connected to a pump. In this preferred embodiment, two water supply pipes 4 are provided.

[0030] In other words, in this embodiment, by using the ring beam 2 to support the inner bottom of the retaining structure 1, the deformation of the retaining structure 1 can be effectively prevented. At the same time, when the pressure in the foundation pit is too high, the water supply pipe 4 can be pumped out through the pump. Since the water supply pipe 4, the ring beam 2, and the seepage pipe 3 are connected in sequence, the liquid in the foundation pit can be transferred to the ground surface for discharge. While limiting the deformation of the retaining structure, the pressure at the bottom of the foundation pit can be relieved, the buoyancy of the bottom plate can be released, and the soil arching phenomenon can be prevented. In turn, the pressure balance between the soil and the building foundation can be maintained. The pumped groundwater can be treated and stored in a reservoir for use in urban greening and other aspects, which is green, energy-saving and environmentally friendly.

[0031] In addition, the pressure mentioned in this embodiment is detected by pressure sensor 7. Specifically, several pressure sensors 7 are also installed at the bottom of the ring beam 2. The pressure sensors 7 are connected to an external control unit through wires. The control unit is used to display the detection value of the pressure sensor 7 so as to open the pump for drainage in a timely manner.

[0032] In some embodiments, the present invention further includes a protective structure 5 installed in the opening of the ring beam 2, the protective structure 5 protecting both sides of the seepage pipe 3.

[0033] Optionally, the protective structure 5 in this embodiment includes two grid plates 51, which are respectively attached to the upper and lower sides of the seepage pipe 3. By protecting the two sides of the seepage pipe 3 with the two grid plates 51, large stones can be prevented from blocking the water inlet hole of the seepage pipe 3, so as to ensure the stability of pressure relief.

[0034] A connecting structure is provided between the two of the grid plates 51.

[0035] Based on the above embodiments, the connection structure in this embodiment includes a plurality of guide posts 52 fixed on the lower grid plate 51, and holes adapted to the guide posts 52 are opened on the end face of the upper grid plate 51.

[0036] The top of the guide post 52 is provided with a deformation opening 53 in the radial direction, and the guide post 52 is also provided with claws 54 on both sides of the deformation opening 53.

[0037] When the protective structure 5 needs to be installed, first install the two grid plates 51 on both sides of the seepage pipe 3. Then, align the hole on the upper grid plate 51 with the guide post 52 and press it in. During this process, the claws 54 on the top of the guide post 52 first deform and retract into the hole, and then reset and stop on the upper side of the upper grid plate 51 during subsequent movement. This can achieve the installation of the two grid plates 51. Of course, the guide post 52 described in this embodiment should be set as an elastic element, such as a silicone element. Conversely, when the grid plate 51 needs to be disassembled for cleaning, press the two claws 54 to deform and retract them, and then separate the two grid plates 51.

[0038] In some embodiments, a support frame 6 is fixedly installed on the top of the ring beam 2 in this invention. The support frame 6 is sleeved on the outside of the water supply pipe 4 and is used to protect the water supply pipe 4.

[0039] The support frame 6 is composed of multiple pipe fittings 61. The bottom of each pipe fitting 61 has an inwardly recessed portion 62 that matches its upper opening. Of course, in order to connect the water supply pipe 4 according to the foundation pit conditions, the water supply pipe 4 in this embodiment can also be spliced ​​in multiple sections. The sections can be connected by water pipe joints. This method is a conventional method for those skilled in the art and will not be described in detail here.

[0040] It should be noted that, in this embodiment, a fixing plate 63 is fixedly installed on the inner side of the retractable part 62. The middle part of the fixing plate 63 has a through hole 65 for the water pipe 4 to pass through. Positioning glass beads 64 are embedded on both sides of the fixing plate 63. The telescopic ends of the positioning glass beads 64 pass through the retractable part 62 and the outer pipe 61.

[0041] In other words, in this embodiment, multiple pipe fittings 61 are spliced ​​together, which can be freely assembled according to the height of the pit. During assembly, multiple pipe fittings 61 are sequentially sleeved on the outside of the water supply pipe 4. The water supply pipe 4 can be constrained by the through hole 65 on the fixing plate 63 inside the pipe fitting 61 to ensure the installation stability of the water supply pipe 4. Then, the inward portion 62 of the upper pipe fitting 61 can be inserted into the upper part of the lower pipe fitting 61. The positioning glass beads 64 on the fixing plate 63 are inserted through the outside of the lower pipe fitting 61 to connect the upper and lower pipe fittings 61.

[0042] Of course, in order to assemble the bottommost pipe 61, a connecting pipe can also be pre-fixed at the top of the ring beam 2. This connecting pipe is used to connect the upper pipe 61. Of course, holes should also be opened on both sides of the reserved pipe, and the upper pipe 61 can be matched with the holes by positioning glass beads 64.

[0043] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A device for releasing the buoyancy of the bottom slab of an underground structure, the device being installed on the inner side of the bottom of the enclosure structure (1), characterized in that, Includes a ring beam (2), the outer periphery of which is attached to the inner side of the enclosure structure (1), and several drainage pipes (3) are installed in the inner opening of the ring beam (2); The ring beam (2) is a hollow structure, the seepage pipe (3) is connected to the hollow structure, and at least one water supply pipe (4) is connected above the ring beam (2). The top of the water supply pipe (4) extends to the ground surface and is connected to a pump.

2. The device for releasing the buoyancy of the foundation slab of an underground structure according to claim 1, characterized in that: It also includes a protective structure (5) installed in the opening of the ring beam (2), the protective structure (5) protecting both sides of the seepage pipe (3).

3. The device for releasing the buoyancy of the foundation slab of an underground structure according to claim 2, characterized in that: The protective structure (5) includes two grid plates (51), which are respectively attached to the upper and lower sides of the seepage pipe (3); A connecting structure is provided between the two of the grid plates (51).

4. The device for releasing the buoyancy of the foundation slab of an underground structure according to claim 3, characterized in that: The connection structure includes a plurality of guide posts (52) fixed on the lower grid plate (51), and the upper grid plate (51) has holes on its end face that are adapted to the guide posts (52); The top of the guide post (52) is provided with a deformation opening (53) in the radial direction, and the guide post (52) is also provided with claws (54) on both sides of the deformation opening (53).

5. The device for releasing the buoyancy of the foundation slab of an underground structure according to claim 1, characterized in that: A support frame (6) is fixedly installed on the top of the ring beam (2), and the support frame (6) is sleeved on the outside of the water pipe (4); The support frame (6) is composed of multiple tubes (61), and the bottom of each tube (61) has an inwardly recessed portion (62) that matches its upper opening.

6. The device for releasing the buoyancy of the foundation slab of an underground structure according to claim 5, characterized in that: A fixing plate (63) is fixedly installed on the inner side of the inner portion (62). The middle part of the fixing plate (63) has a through hole (65) for the water pipe (4) to pass through. Positioning glass beads (64) are embedded on both sides of the fixing plate (63). The telescopic ends of the positioning glass beads (64) pass through the inner portion (62) and the outer pipe fitting (61).

7. A device for releasing the buoyancy of the foundation slab of an underground structure according to any one of claims 1-6, characterized in that: Several pressure sensors (7) are also installed at the bottom of the ring beam (2), and the pressure sensors (7) are connected to an external control unit via wires.

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