Supporting system for circular foundation pit

Abstract

The invention provides a supporting system for a circular foundation pit, comprising: a plurality of arc-shaped supporting beams which are arc-shaped section steel, the arc-shaped supporting beams forming a supporting ring, the supporting ring being located on the inner side of a circular diaphragm wall; the multiple hydraulic connector boxes are correspondingly arranged at the joints of the adjacent arc supporting beams, and each hydraulic connector box is correspondingly connected with the arc supporting beams on the two sides; the gap liner layer is arranged between the supporting circular ring and the circular diaphragm wall; and the hydraulic pump station is in communication connection with the hydraulic joint box and is communicated through a hydraulic pipeline. The supporting system for the circular foundation pit can provide stable and reliable support for the circular foundation pit, has the characteristic of intelligence, can achieve real-time remote monitoring and unattended automatic adjustment, and further has the advantages of being short in construction period and easy to disassemble.

Description

Technical Field

[0001] The present invention relates to the technical field of foundation pit engineering, and particularly to a support system for a circular foundation pit. Background Art

[0002] At present, in foundation pit engineering, especially in the construction of circular foundation pits, the support system is a key part to ensure the stability of the foundation pit. Traditional support forms mostly adopt reinforced concrete inner ring beams or lining wall supports, etc. These support forms have many inconveniences in construction. First of all, the construction period of reinforced concrete supports is long, and the next step of construction cannot be carried out until the concrete reaches the designed strength, which undoubtedly increases the construction period. Secondly, after the foundation pit bottom slab is poured, the reinforced concrete support is often difficult to disassemble, bringing difficulties to the subsequent structure backfilling. Moreover, the traditional support forms are not timely enough in monitoring and responding to the deformation of the foundation pit, and cannot adjust the support force in real time according to the actual deformation of the foundation pit, which may affect the stability of the foundation pit. Summary of the Invention

[0003] In order to solve the above problems, the present invention aims to provide a support system for a circular foundation pit.

[0004] To achieve the above object, the present invention provides a support system for a circular foundation pit, including: an arc support beam, which is an arc-shaped section steel, and a plurality of arc support beams form a support ring, and the support ring is located inside the circular diaphragm wall; a hydraulic joint box, which is a plurality of, corresponding to the joints of adjacent arc support beams, and each hydraulic joint box is correspondingly connected to the arc support beams on both sides; a gap cushion layer, which is arranged between the support ring and the circular diaphragm wall; a hydraulic pump station, which is communicatively connected to the hydraulic joint box and is connected through a hydraulic pipeline.

[0005] Further, in the support system for a circular foundation pit provided by the present invention, it may also have the following characteristics: the hydraulic joint box includes a box shell, and a two-way hydraulic cylinder is arranged inside the box shell. The two-way hydraulic cylinder has two piston rods with opposite directions, and the ends of the two piston rods are both fixed with top plates, and the two top plates are respectively connected and fixed to the arc support beams on both sides through bolts.

[0006] Further, in the support system for a circular foundation pit provided by the present invention, it may also have the following characteristics: the box shell is a steel plate shell structure, the box shell is an arc-shaped cavity, and the cross-sectional shape of the box shell is rectangular.

[0007] Further, in the support system for a circular foundation pit provided by the present invention, it may also have the following characteristics: there are four hydraulic joint boxes, which are arranged in an annular array; the arc support beams are in four sections, and the structure and size of each section are the same.

[0008] Furthermore, in the support system for circular foundation pits provided by the present invention, the following features may also be included: The hydraulic joint box is also provided with a pressure sensor and a displacement sensor. The pressure sensor is used to monitor the pressure value at the top plate, and the displacement sensor is used to monitor the displacement value of the top plate.

[0009] Furthermore, in the support system for circular foundation pits provided by the present invention, the following features may also be included: The hydraulic pump station is provided with: a signal receiving module for receiving signals from the pressure sensor and the displacement sensor; a signal processing module for processing the signals of the signal receiving module; a set value storage module storing a pressure set value and a displacement set value; a judgment module for judging whether the monitored pressure value is less than the pressure set value and whether the monitored displacement value is less than the displacement set value; an instruction generation module for generating a compensation instruction when the judgment module determines that the monitored pressure value is less than the pressure set value or the monitored displacement value is less than the displacement set value; a signal output module for outputting a compensation instruction signal to the hydraulic joint box, and the controller of the double-acting hydraulic cylinder controls the cylinder to work to compensate the axial force or stroke.

[0010] Furthermore, in the support system for circular foundation pits provided by the present invention, the following features may also be included: The gap cushion layer is a cork layer or a rubber layer.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. In the support system for circular foundation pits of the present invention, a socket connection is formed between the arc support beam and the joint box, constituting a support ring, which can adapt to the characteristics of circular diaphragm walls, achieve uniform support, and improve the support effect.

[0013] 2. In the support system for circular foundation pits of the present invention, the setting of the gap cushion layer not only ensures the close fit between the support ring and the circular diaphragm wall, but also can generate a radial thrust on the circular diaphragm wall when the diameter of the support ring increases, and through the strong friction force with the circular diaphragm wall, the support ring can stably play its role.

[0014] 3. In the support system for circular foundation pits of the present invention, through the built-in sensors and the control system of the hydraulic pump station, real-time remote monitoring and unattended automatic adjustment of the support ring are realized, featuring intelligence and automation.

[0015] 4. In the support system for circular foundation pits of the present invention, the internal clearance of the support ring is large, providing a larger working surface compared to traditional cross braces and corner braces, facilitating construction such as excavation and backfilling within the circular foundation pit.

[0016] 5. The support system for circular foundation pits of the present invention is convenient and fast to install and disassemble. It can be quickly assembled and disassembled according to the engineering needs, reducing the construction difficulty and cost and improving the construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the support system for circular foundation pits in an embodiment of the present invention;

[0018] Figure 2 is a schematic connection diagram of the hydraulic joint box and the arc support beam in an embodiment of the present invention;

[0019] Figure 3 is a schematic structural diagram of the housing of the hydraulic joint box in an embodiment of the present invention;

[0020] Figure 4 is a block diagram of the control system of the hydraulic pump station in an embodiment of the present invention;

[0021] Figure 5 is a schematic diagram of the support principle of the support system for circular foundation pits in an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the following embodiments will specifically describe the technical solutions of the present invention in conjunction with the drawings.

[0023] See Figure 1 , this embodiment provides a support system for circular foundation pits, including an arc support beam 4, a hydraulic joint box 2, a gap cushion layer 3, and a hydraulic pump station 7.

[0024] The arc support beam 4 is an arc-shaped section steel. A plurality of arc support beams 4 form a support ring. The support ring is located inside the circular diaphragm wall 1. The support ring is the main load-bearing structure, and the section steel material ensures that it has sufficient strength and stiffness to withstand the load generated by the excavation of the circular foundation pit. The diameter of the support ring is customized according to the diameter of the circular foundation pit to ensure that the support ring fits tightly with the circular diaphragm wall and realizes uniform support.

[0025] There are a plurality of hydraulic joint boxes 2, which are correspondingly arranged at the joints of adjacent arc support beams 4, and each hydraulic joint box 2 is correspondingly connected to the arc support beams 4 on both sides. See Figure 1 , preferably, there are four hydraulic joint boxes 2, which are arranged in a circular array.

[0026] See Figure 2 , the hydraulic joint box 2 includes a housing 21, and a two-way hydraulic cylinder 22 is arranged inside the housing 21. The housing 21 is a steel plate housing structure. See Figure 3, the housing 21 is an overall arc-shaped cavity, and the cross-sectional shape of the housing 21 (such as Figure 3 the S shown) is rectangular. Through grooves are provided on the left and right side surfaces of the housing 21 for the arc support beam 4 to pass through. The double-acting hydraulic cylinder 22 has two piston rods with opposite directions, and top plates 23 are fixed to the ends of both piston rods. The two top plates 23 are respectively connected and fixed to the arc support beams 4 on both sides through bolts 24.

[0027] An insertion connection is formed between the arc support beam 4 and the hydraulic joint box 2. Refer to Figure 5 , when the piston rod of the double-acting hydraulic cylinder 22 pushes or contracts, the arc support beam 4 moves along a circular arc trajectory, so that the contour of the support ring is always constrained to be circular. When the piston rod of the double-acting hydraulic cylinder 22 pushes and extends, the contour of the support ring is as shown in Figure 5 a in; when the piston rod of the double-acting hydraulic cylinder 22 contracts, the contour of the support ring is as shown in Figure 5 b in. The radius of the support ring in the extended state is R1, the radius of the support ring in the contracted state is R2, and the difference between R1 and R2 is d.

[0028] The gap cushion layer 3 is arranged between the support ring and the circular diaphragm wall 1. The gap cushion layer 3 is a cork layer or a rubber layer. The gap cushion layer 3 is used to ensure the effective transmission of the support force and increase the friction with the diaphragm wall. It has the characteristics of high elastic modulus and high wear resistance, so that the support ring can resist its own gravity only by the friction force with the diaphragm wall.

[0029] Refer to Figure 1 , the hydraulic pump station 7 is connected to the double-acting hydraulic cylinder 22 in the hydraulic joint box 2 through the communication cable 5 and communicated through the hydraulic pipeline 6. The communication cable 5 includes multiple communication lines connecting adjacent hydraulic joint boxes 2 and a communication bus connecting the hydraulic joint box 2 and the hydraulic pump station 7. The hydraulic pipeline 6 is four, connecting the hydraulic pump station 7 and the four hydraulic joint boxes 2. The hydraulic pump station 7 is connected to an external power supply.

[0030] A pressure sensor and a displacement sensor are also arranged in the hydraulic joint box 2. The pressure sensor is used to monitor the pressure value at the top plate, and the displacement sensor is used to monitor the displacement value of the top plate.

[0031] The hydraulic pump station is provided with a control system. Refer to Figure 4 , this control system includes a signal receiving module 101, a signal processing module 102, a set value storage module 103, a judgment module 104, an instruction generation module 105, and a signal output module 106.

[0032] The signal receiving module 101 is used to receive the signals from the pressure sensor and the displacement sensor. The signal processing module 102 is used to process the signals of the signal receiving module 101, including conventional signal processing procedures such as analog-to-digital conversion, filtering, and signal amplification. The set value storage module 103 stores the pressure set value and the displacement set value. The judgment module 104 is used to judge whether the monitored pressure value is less than the pressure set value and whether the monitored displacement value is less than the displacement set value. When the judgment module 104 judges that the monitored pressure value is less than the pressure set value or the monitored displacement value is less than the displacement set value, the instruction generation module 105 generates a compensation instruction, which is used to control the compensation axial force or stroke so that the pressure value at the roof equals the pressure set value and the displacement value of the roof equals the displacement set value. The signal output module 106 outputs the compensation instruction signal to the hydraulic joint box, and the controller of the bidirectional hydraulic cylinder controls the operation of the cylinder to compensate the axial force or stroke. By adjusting the axial force or stroke of the bidirectional hydraulic cylinder, the support ring can be adjusted to meet the stability requirements of the circular foundation pit.

[0033] The above embodiments are only the preferred embodiments of the present invention and are not used to limit the protection scope of the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A support system for a circular foundation pit, characterized in that: include: The arc support beam is an arc segment steel, and a plurality of the arc support beams form a support ring, and the support ring is located on the inner side of the circular ground connecting wall; There are multiple hydraulic joint boxes, which are arranged correspondingly at the connection points of the adjacent arc support beams, and each hydraulic joint box is connected to the arc support beams on both sides; A gap lining layer is arranged between the supporting ring and the circular ground connecting wall; The hydraulic pump station is communicatively connected with the hydraulic joint box and communicated with the hydraulic pipeline.

2. The support system for a circular foundation pit according to claim 1, characterized in that: in, The hydraulic joint box includes a box shell, in which a bidirectional hydraulic cylinder is arranged. The bidirectional hydraulic cylinder has two piston rods in opposite directions. Top plates are fixed to the ends of the two piston rods. The two top plates are respectively connected and fixed to the arc support beams on both sides by bolts.

3. The support system for a circular foundation pit according to claim 2, characterized in that: in, The box shell is a steel plate shell structure, the box shell is an arc-shaped cavity, and the cross-section of the box shell is rectangular.

4. The support system for a circular foundation pit according to claims 1 to 3, characterized in that: in, There are four hydraulic joint boxes, which are arranged in a circular array; The arc support beam is divided into four sections, and each section has the same structure and size.

5. The support system for a circular foundation pit according to claim 2, characterized in that: in, The hydraulic joint box is also provided with a pressure sensor and a displacement sensor. The pressure sensor is used to monitor the pressure value at the top plate. The displacement sensor is used to monitor the displacement value of the top plate.

6. The support system for a circular foundation pit according to claim 5, Features: Wherein, the hydraulic pump station is provided with: A signal receiving module, used for receiving signals from the pressure sensor and the displacement sensor; A signal processing module, used for processing the signal of the signal receiving module; A set value storage module stores pressure set values ​​and displacement set values; A judgment module, used to judge whether the monitored pressure value is less than the pressure setting value, and judge whether the monitored displacement value is less than the displacement setting value; An instruction generating module, which generates a compensation instruction when the judging module judges that the monitored pressure value is less than the pressure setting value or the monitored displacement value is less than the displacement setting value; The signal output module outputs a compensation command signal to the hydraulic joint box, and the controller of the bidirectional hydraulic cylinder controls the cylinder to compensate for the axial force or stroke.

7. The support system for a circular foundation pit according to claim 1, characterized in that: in, The gap lining layer is a cork layer or a rubber layer.

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