Soil deformation control device based on bladder expansion

Abstract

The present invention belongs to the technical field of underground construction, and discloses a soil deformation control device based on bladder expansion, including a stress measuring device, an upper fixed plate and a lower fixed plate with adjustable spacing, a bladder outer membrane, and a control unit. The stress measuring device is used to measure the stress value in the soil to be corrected, and a plurality of connecting rod assemblies distributed in a circumference are arranged between the upper fixed plate and the lower fixed plate. When the two are close, the connecting rod assemblies expand outward; the bladder outer membrane is covered outside the plurality of connecting rod assemblies and is made of elastic material; the control unit is used to adjust the spacing between the upper fixed plate and the lower fixed plate according to the stress value measured by the stress measuring device, until the stress value in the soil to be corrected reaches a preset stress value. The stress measuring device can feedback the deformation required for the bladder outer membrane when correcting the soil, and the control unit can adjust the deformation of the plurality of connecting rod assemblies according to the actual supporting force required for the soil to be corrected. The plurality of connecting rod assemblies can support the bladder outer membrane to prevent the shape of the bladder outer membrane from being out of control.

Description

Technical Field

[0001] The invention relates to the technical field of underground construction, and in particular to a soil deformation control device based on bladder expansion. Background Art

[0002] The deformation of tunnels and foundation pits can cause great harm. With the development of cities, there are more and more underground buildings, underground space resources are becoming increasingly scarce, and the requirements for soil deformation control are becoming increasingly high. As an emerging method for active deformation control of tunnels and foundation pits, the bladder expansion technology has high control efficiency and low cost. For example, if a tunnel or foundation pit soil is sunken somewhere, it is necessary to set a bladder on the back of the sunken place. After the bladder expands, the sunken soil can be pushed back to its original position.

[0003] In the bladder expansion technology, hydraulic cementitious materials such as mortar or air-hardening cementitious materials are often used to expand the outer membrane of the bladder. This technology has the following defects: (1) The volume of the bladder is consistent with the grouting volume. Once the grouting solidifies, the outer shape cannot be changed, and the shape of the bladder cannot be changed either, and cannot be corrected or adjusted; (2) Even if the bladder is made of flexible materials such as rubber, the shape of the bladder may be out of control; (3) Since the hydraulic cementitious materials or air-hardening cementitious materials in the bladder have a short curing time, the expansion of the bladder cannot be changed in real time according to engineering requirements. Summary of the invention

[0004] The object of the present invention is to provide a soil deformation control device based on bladder expansion, which can control the deformation degree of the bladder according to the actual supporting force required for correcting the soil deformation, thereby avoiding the phenomenon of the bladder shape being out of control.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A soil deformation control device based on bladder expansion is provided, comprising:

[0007] A stress measuring device, buried in the soil body to be corrected, for measuring the stress value in the soil body to be corrected;

[0008] An upper fixing plate and a lower fixing plate with adjustable spacing, a plurality of connecting rod assemblies distributed in a circumference are arranged between the upper fixing plate and the lower fixing plate, each of the connecting rod assemblies comprises a plurality of connecting rods hinged in sequence, the uppermost connecting rod in each of the connecting rod assemblies is hinged to the upper fixing plate, and the lowermost connecting rod is hinged to the lower fixing plate, and when the upper fixing plate and the lower fixing plate are close to each other, the connecting rod assemblies expand outwards;

[0009] The outer membrane of the bladder is covered outside the plurality of connecting rod assemblies, and the outer membrane of the bladder is made of elastic material;

[0010] A control unit is used to adjust the distance between the upper fixing plate and the lower fixing plate according to the stress value measured by the stress measuring device until the stress value in the soil body to be corrected reaches a preset stress value.

[0011] As a preferred solution of the soil deformation control device based on bladder expansion provided by the present invention, an adjustment component is arranged between the upper fixed plate and the lower fixed plate, and the adjustment component includes a sleeve and an adjustment rod telescopically arranged in the sleeve, and the distance between the upper fixed plate and the lower fixed plate is adjusted by adjusting the distance that the adjustment rod extends out of the sleeve.

[0012] As a preferred solution of the soil deformation control device based on bladder expansion provided by the present invention, the casing is a threaded casing, the adjusting rod is a screw, the threaded casing is connected to the side of the lower fixed plate facing the upper fixed plate, the lower end of the screw is threaded in the threaded casing, and a control rod is provided at the upper end, the control rod is rotatably penetrated through the upper fixed plate, and an axial limiting structure is provided between the control rod and the upper fixed plate.

[0013] As a preferred solution of the soil deformation control device based on bladder expansion provided by the present invention, the axial limiting structure includes a bearing, the control rod is inserted into the inner ring of the bearing, and the upper fixing plate is sleeved on the outer ring of the bearing.

[0014] As a preferred solution of the soil deformation control device based on bladder expansion provided by the present invention, the control rod is a hollow structure, the upper end of the screw rod is coaxially penetrated into the control rod, and the control rod is connected to the inner cavity of the outer membrane of the bladder so as to inject grout into the inner cavity of the outer membrane of the bladder through the control rod.

[0015] As a preferred solution of the soil deformation control device based on bladder expansion provided by the present invention, the upper end of the control rod is connected to an upper grouting port, and the lower end is connected to a lower grouting port, and the lower grouting port is connected to the inner cavity of the outer membrane of the bladder.

[0016] As a preferred solution of the soil deformation control device based on bladder expansion provided by the present invention, it also includes a temporary sealing structure.

[0017] The temporary sealing structure comprises a temporary sealing sleeve, the lower end of which is connected to the upper end of the control rod, the upper grouting port is arranged at the upper end of the temporary sealing sleeve, and a temporary sealing material can be filled into the temporary sealing sleeve through the upper grouting port, and the temporary sealing material comprises foam or cement; or

[0018] The temporary sealing structure includes a diaphragm detachably covered on the upper grouting port.

[0019] As a preferred solution of the soil deformation control device based on bladder expansion provided by the present invention, the temporary sealing structure includes a temporary sealing sleeve, and a burr structure is arranged inside the temporary sealing sleeve, and the burr structure is used to adhere to the temporary sealing material.

[0020] As a preferred solution of the soil deformation control device based on bladder expansion provided by the present invention, a plurality of the connecting rod assemblies are arranged at equal intervals, and each of the connecting rod assemblies includes three connecting rods hinged in sequence.

[0021] As a preferred solution of the soil deformation control device based on bladder expansion provided by the present invention, the outer membrane of the bladder is a rubber membrane.

[0022] Beneficial effects of the present invention:

[0023] The present invention provides a soil deformation control device based on bladder expansion, which can measure the stress value in the soil to be corrected through a stress measuring device, and transmit the stress value to a control unit, and the control unit adjusts the spacing between the upper fixing plate and the lower fixing plate according to the stress value measured by the stress measuring device, so that the upper fixing plate and the lower fixing plate are close to each other, and the connecting rod assembly located between the upper fixing plate and the lower fixing plate expands outward, thereby driving the outer membrane of the bladder covered outside the plurality of connecting rod assemblies to expand and become larger, until the outer membrane of the bladder contacts and squeezes the soil to be corrected, during which the stress measuring device monitors the stress value in the soil to be corrected in real time, and when the stress value reaches a preset stress value, the upper fixing plate and the lower fixing plate can be stopped from being driven close to each other. That is, the stress measuring device is used to feedback the deformation required for the outer membrane of the bladder when correcting the soil, and the control unit can adjust the deformation amount of the plurality of connecting rod assemblies according to the actual supporting force required for the soil to be corrected, so that the outer membrane of the bladder expands to an appropriate degree, and the plurality of connecting rod assemblies can support the outer membrane of the bladder, so as to avoid the phenomenon of the outer membrane of the bladder losing control. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of the soil deformation control device provided by a specific embodiment of the present invention when the outer membrane of the bladder is not expanded;

[0025] Figure 2 is an internal schematic diagram of a soil deformation control device provided in a specific embodiment of the present invention;

[0026] Figure 3 It is a schematic diagram of the connecting rod assembly provided by a specific embodiment of the present invention when expanding outward.

[0027] In the figure:

[0028] 1. Stress measuring device; 2. Upper fixing plate; 3. Lower fixing plate; 4. Connecting rod assembly; 5. Outer membrane of bladder; 7. Upper grouting port; 8. Lower grouting port; 9. Temporary sealing sleeve; 10. Control circuit;

[0029] 61. threaded sleeve; 62. screw; 63. control rod;

[0030] 41. Connecting rod. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0032] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0035] like Figure 1 , Figure 2 as well as Figure 3 As shown, this embodiment provides a soil deformation control device based on bladder expansion, including a stress measuring device 1, an upper fixing plate 2 and a lower fixing plate 3 with adjustable spacing, a bladder outer membrane 5 and a control unit.

[0036] The stress measuring device 1 is buried in the soil to be corrected, and is used to measure the stress value in the soil to be corrected; a plurality of connecting rod assemblies 4 distributed in a circumference are arranged between the upper fixing plate 2 and the lower fixing plate 3, and each connecting rod assembly 4 includes a plurality of connecting rods 41 hinged in sequence, and the uppermost connecting rod 41 of each connecting rod assembly 4 is hinged to the upper fixing plate 2, and the lowermost connecting rod 41 is hinged to the lower fixing plate 3. When the upper fixing plate 2 and the lower fixing plate 3 are close to each other, the connecting rod assembly 4 expands outward. The outer membrane of the bladder 5 is covered outside the plurality of connecting rod assemblies 4, and the outer membrane of the bladder 5 is made of elastic material and can expand and deform. Taking one of the connecting rod assemblies 4 as an example, when the upper fixing plate 2 and the lower fixing plate 3 are close to each other, the uppermost connecting rod 41 rotates relative to the upper fixing plate 2 in a direction away from the center of the outer membrane 5 of the bladder, and the lowermost connecting rod 41 rotates relative to the lower fixing plate 3 in a direction away from the center of the outer membrane 5 of the bladder, and at the same time, the connecting rods 41 also rotate relative to each other, so that the connecting rod assembly 4 expands and deforms outwards, thereby opening the outer membrane 5 of the bladder. The control unit is used to adjust the distance between the upper fixing plate 2 and the lower fixing plate 3 according to the stress value measured by the stress measuring device 1 until the stress value in the soil body to be corrected reaches a preset stress value.

[0037] The soil deformation control device based on bladder expansion provided in this embodiment can measure the stress value in the soil to be corrected through the stress measuring device 1, and transmit the stress value to the control unit. The control unit adjusts the distance between the upper fixing plate 2 and the lower fixing plate 3 according to the stress value measured by the stress measuring device 1, so that the upper fixing plate 2 and the lower fixing plate 3 are close to each other, and the connecting rod assembly 4 located between the upper fixing plate 2 and the lower fixing plate 3 expands outward, thereby driving the outer membrane of the bladder 5 covering the outside of the multiple connecting rod assemblies 4 to expand and become larger until the outer membrane of the bladder 5 contacts and squeezes the soil to be corrected. During this period, the stress measuring device 1 monitors the stress value in the soil to be corrected in real time. When the stress value reaches the preset stress value, the upper fixing plate 2 and the lower fixing plate 3 can be stopped from being driven close to each other. That is, the stress measuring device 1 is used to feedback the required deformation of the outer membrane of the bladder 5 when correcting the soil. The control unit can adjust the deformation of the multiple connecting rod assemblies 4 according to the actual supporting force required by the soil to be corrected, so that the outer membrane of the bladder 5 can expand to an appropriate degree. The multiple connecting rod assemblies 4 can support the outer membrane of the bladder 5 to avoid the phenomenon of the outer membrane of the bladder 5 being out of control.

[0038] In this embodiment, the outer membrane 5 of the bladder can be made of a rubber membrane, which has a large elastic deformation capacity, a high load-bearing capacity, and is not easily damaged by expansion. Alternatively, the outer membrane 5 of the bladder can also be made of other flexible materials with a strong load-bearing capacity.

[0039] See also Figure 1 The soil deformation control device also includes a control circuit 10, and the stress measuring device 1 and the control unit are both arranged on the control circuit 10.

[0040] An adjustment component is provided between the upper fixing plate 2 and the lower fixing plate 3, and the adjustment component is used to adjust the distance between the upper fixing plate 2 and the lower fixing plate 3. Specifically, the adjustment component includes a sleeve and an adjustment rod telescopically arranged in the sleeve, and the distance between the upper fixing plate 2 and the lower fixing plate 3 is adjusted by adjusting the distance that the adjustment rod extends out of the sleeve, which is convenient to operate and easy to implement.

[0041] Specifically in this embodiment, see Figure 2 and Figure 3 The sleeve is a threaded sleeve 61, and the adjusting rod is a screw 62. The threaded sleeve 61 is connected to the side of the lower fixing plate 3 facing the upper fixing plate 2. The lower end of the screw 62 is screwed into the threaded sleeve 61, and the upper end is provided with a control rod 63. The control rod 63 is rotatably arranged in the upper fixing plate 2, and an axial limiting structure is arranged between the control rod 63 and the upper fixing plate 2. Since the lower end of the control rod 63 is connected to the screw 62, the screw 62 can be driven to rotate in the threaded sleeve 61 by rotating the control rod 63, so that the screw 62 is screwed into the threaded sleeve 61 more, so that the upper fixing plate 2 moves down to approach the lower fixing plate 3, and the multiple connecting rod assemblies 4 expand and deform outward to open the outer membrane of the capsule 5. In this process, the control rod 63 rotates relative to the upper fixing plate 2. When the control rod 63 moves down driven by the screw 62, the upper fixing plate 2 moves down accordingly due to the action of the axial limiting structure. That is, when the control rod 63 rotates, the upper fixing plate 2 does not rotate accordingly, but the upper fixing plate 2 moves downward along with the control rod 63 to get closer to the lower fixing plate 3 .

[0042] Preferably, the axial limiting structure includes a bearing, the control rod 63 is inserted into the inner ring of the bearing, and the upper fixed plate 2 is sleeved on the outer ring of the bearing. By providing the bearing, the control rod 63 can be rotated relative to the upper fixed plate 2, and the friction resistance when the control rod 63 rotates relative to the upper fixed plate 2 can be reduced. At the same time, the bearing can also play an axial limiting role to avoid axial displacement between the upper fixed plate 2 and the control rod 63.

[0043] In this embodiment, the control rod 63 is a hollow structure, and the upper end of the screw 62 is coaxially arranged in the control rod 63. When the control rod 63 drives the screw 62 to rotate, the two rotate coaxially to avoid eccentric rotation. The control rod 63 is connected to the inner cavity of the outer membrane 5 of the bladder, so that grouting is performed into the inner cavity of the outer membrane 5 of the bladder through the control rod 63. The grouting material can be cement mortar, etc., which can play a role in stabilizing and supporting the deformed soil after solidification, and prevent the soil from deforming again after correction. Further, the upper end of the control rod 63 is connected to the upper grouting port 7, and the lower end is connected to the lower grouting port 8, and the lower grouting port 8 is connected to the inner cavity of the outer membrane 5 of the bladder. Slurry is injected through the upper grouting port 7, and the slurry enters the inner cavity of the outer membrane 5 of the bladder through the upper grouting port 7, the inner cavity of the control rod 63 and the lower grouting port 8 in turn.

[0044] During the expansion of the outer membrane 5 of the bladder, in order to prevent foreign matter from entering the inner cavity of the outer membrane 5 of the bladder through the upper grouting port 7, the position of the upper grouting port 7 can be temporarily sealed by a temporary sealing structure. Figure 2 and Figure 3 The temporary sealing structure includes a temporary sealing sleeve 9, the lower end of which is connected to the upper end of the control rod 63 and communicated with the inner cavity of the control rod 63, and the upper grouting port 7 is arranged at the upper end of the temporary sealing sleeve 9 and communicated with the inner cavity of the temporary sealing sleeve 9, and the temporary sealing material can be filled into the temporary sealing sleeve 9 through the upper grouting port 7, and the temporary sealing material includes foam or cement. The foam or cement filled in the temporary sealing sleeve 9 can play a sealing and protective role to prevent foreign matter from entering the outer membrane 5 of the capsule.

[0045] Furthermore, a burr structure is provided in the temporary sealing sleeve 9, and the burr structure is used to stick the temporary plugging material. The burr structure in the temporary sealing sleeve 9 makes the inner wall of the temporary sealing sleeve 9 rough and uneven, and can stick to the foam or cement filled in its inner wall to prevent the foam or cement from falling into the control rod 63.

[0046] In other embodiments, the temporary sealing structure may also include a membrane detachably covered on the upper grouting port 7, and the membrane can prevent foreign matter from entering the outer membrane 5 of the bladder through the upper grouting port 7. Exemplarily, the membrane may be a plastic film.

[0047] See also Figure 2 and Figure 3 In this embodiment, a plurality of connecting rod assemblies 4 are arranged at equal intervals and distributed in a circumference. When the upper fixing plate 2 approaches the lower fixing plate 3, the plurality of connecting rod assemblies 4 simultaneously expand and deform outward to open the outer membrane of the cystic body 5. Furthermore, each connecting rod assembly 4 includes three connecting rods 41 hinged in sequence, and the arrangement is reasonable. If there are too many connecting rods 41, some of the connecting rods 41 may rotate inwards and fail to support the outer membrane of the cystic body 5 when the upper fixing plate 2 approaches the lower fixing plate 3. Among the three connecting rods 41 of each connecting rod assembly 4, the lengths of the upper connecting rod 41 and the lower connecting rod 41 are equal, so that the plurality of connecting rod assemblies 4 are always in a vertically symmetrical structure when supporting the deformation of the outer membrane of the cystic body 5, ensuring that the outer membrane of the cystic body 5 is in a good shape.

[0048] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A soil deformation control device based on bladder expansion, characterized in that: include: A stress measuring device (1) is buried in the soil body to be corrected and is used to measure the stress value in the soil body to be corrected; An upper fixing plate (2) and a lower fixing plate (3) with adjustable spacing, a plurality of connecting rod assemblies (4) distributed in a circumference are arranged between the upper fixing plate (2) and the lower fixing plate (3), each of the connecting rod assemblies (4) comprises a plurality of connecting rods (41) hinged in sequence, the uppermost connecting rod (41) in each of the connecting rod assemblies (4) being hinged to the upper fixing plate (2), and the lowermost connecting rod (41) being hinged to the lower fixing plate (3), and when the upper fixing plate (2) and the lower fixing plate (3) are brought close to each other, the connecting rod assemblies (4) expand outwards; The outer membrane of the bladder (5) is covered on the outside of the plurality of connecting rod assemblies (4), and the outer membrane of the bladder (5) is made of elastic material; A control unit, used for adjusting the distance between the upper fixing plate (2) and the lower fixing plate (3) according to the stress value measured by the stress measuring device (1), until the stress value in the soil body to be corrected reaches a preset stress value; An adjustment component is provided between the upper fixing plate (2) and the lower fixing plate (3), the adjustment component comprising a sleeve and an adjustment rod telescopically arranged in the sleeve, and the distance between the upper fixing plate (2) and the lower fixing plate (3) is adjusted by adjusting the distance that the adjustment rod extends out of the sleeve; The sleeve is a threaded sleeve (61), and the adjusting rod is a screw (62). The threaded sleeve (61) is connected to a side of the lower fixing plate (3) facing the upper fixing plate (2). The lower end of the screw (62) is screwed into the threaded sleeve (61), and a control rod (63) is provided at the upper end. The control rod (63) is rotatably inserted into the upper fixing plate (2), and an axial limiting structure is provided between the control rod (63) and the upper fixing plate (2). The control rod (63) is a hollow structure. The upper end of the screw rod (62) is coaxially inserted into the control rod (63). The control rod (63) is connected to the inner cavity of the outer membrane of the bladder (5) so that grouting can be performed into the inner cavity of the outer membrane of the bladder (5) through the control rod (63).

2. The soil deformation control device based on bladder expansion according to claim 1 is characterized in that: The axial limiting structure comprises a bearing, the control rod (63) is inserted into the inner ring of the bearing, and the upper fixing plate (2) is sleeved on the outer ring of the bearing.

3. The soil deformation control device based on bladder expansion according to claim 1 is characterized in that: The upper end of the control rod (63) is connected to an upper grouting port (7), and the lower end is connected to a lower grouting port (8), and the lower grouting port (8) is in communication with the inner cavity of the outer membrane (5) of the bladder.

4. The soil deformation control device based on bladder expansion according to claim 3 is characterized in that: Also includes temporary closed structures, The temporary sealing structure comprises a temporary sealing sleeve (9), the lower end of the temporary sealing sleeve (9) is connected to the upper end of the control rod (63), the upper grouting port (7) is arranged at the upper end of the temporary sealing sleeve (9), and a temporary sealing material can be filled into the temporary sealing sleeve (9) through the upper grouting port (7), and the temporary sealing material comprises foam or cement; or, The temporary sealing structure comprises a diaphragm detachably covered on the upper grouting port (7).

5. The soil deformation control device based on bladder expansion according to claim 4 is characterized in that: The temporary sealing structure comprises a temporary sealing sleeve (9), wherein a burr structure is arranged inside the temporary sealing sleeve (9), and the burr structure is used for adhering the temporary sealing material.

6. The soil deformation control device based on bladder expansion according to any one of claims 1 to 5, characterized in that: The plurality of connecting rod assemblies (4) are arranged at equal intervals, and each connecting rod assembly (4) comprises three connecting rods (41) hinged in sequence.

7. The soil deformation control device based on bladder expansion according to any one of claims 1 to 5, characterized in that: The outer membrane of the bladder (5) is a rubber membrane.

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