A tunnel earth pressure cell auxiliary installation device

Abstract

This invention discloses an auxiliary installation device for tunnel earth pressure cells, including an earth pressure cell fixing device positioned between a steel arch and the tunnel arch, and a line protection device laid on the steel arch. The earth pressure cell fixing device uses easily adjustable screws to rotate and fix the earth pressure cell. The rotation device can be used to adjust the angle of the fixing device, making the earth pressure cell fit more closely to the excavation profile. The telescopic device can adjust the height of the device, suitable for situations where the tunnel excavation profile is uneven under over- or under-excavation. The fixing device is suitable for the initial support steel arch structure, and the steel arch and the fixing device are rotated and fixed by screws. This invention focuses on the installation and protection of tunnel earth pressure cells and lines. The fixing device installs the earth pressure cell by mechanically fixing it with nuts. It adopts an integrated assembly to protect the instrument and lines, which is easy to operate and suitable for areas with complex excavation profiles. It reduces the damage to the earth pressure cell and lines during construction and ensures the accuracy of measurement results.

Description

Technical Field

[0001] This invention relates to the field of tunnel engineering technology, specifically to an auxiliary installation device for a tunnel earth pressure box. Background Technology

[0002] With the development of highway transportation and the expansion of tunnel construction, the mining method, as a traditional method of tunnel excavation, generally adopts an initial support and secondary lining structure as the support system. During the initial support process, after excavation, the surrounding rock undergoes stress release and deformation. The deformation pressure test data of the surrounding rock is often used as an important basis for measuring the stability of the surrounding rock and determining the timing of subsequent construction procedures. In construction, earth pressure cells are typically used to measure the stress parameters of the tunnel surrounding rock to evaluate the deformation trend, degree, and stability of the tunnel surrounding rock.

[0003] However, there are no dedicated installation and protection instruments for earth pressure cells and their wiring. Currently, the earth pressure cell is generally fixed with a welded steel frame, and then the structure is welded to a steel arch frame. However, this method has limitations. First, the welded steel frame is too heavy, making it difficult to operate. Second, the fixed height and angle of the steel frame are unsuitable for tunnels with uneven excavation contours. Third, the welding method of fixing to the steel arch frame is unusable in gas-bearing tunnels. This results in low reliability of earth pressure cell measurement results, posing a potential threat to the tunnel. The earth pressure cell instrument wiring is generally directly exposed to the air. During the initial spraying of concrete for support, the wiring is easily broken, causing the buried instrument to be unable to read data, resulting in wasted measurement points. Both of these factors combined limit the earth pressure cell measurement method, leading to doubts about the accuracy of the measurement results and affecting subsequent tunnel excavation analysis. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention provides an auxiliary installation device for tunnel earth pressure cells, which makes the installation of earth pressure cells simpler and more secure and reliable; the measuring instrument circuit is protected by a full-process protection device to avoid the impact or damage during construction, ensuring the reliability of earth pressure cell measurement data.

[0005] This invention is achieved through the following technical solution:

[0006] An auxiliary installation device for a tunnel earth pressure box includes an earth pressure box fixing device and a line protection device. The earth pressure box fixing device is set between a steel arch frame and the tunnel arch, and the line protection device is laid on the steel arch frame in a conformal manner.

[0007] The earth pressure cell fixing device includes a fixing box, a rotating device, a lifting and adjusting device, and a fixing device. The fixing box is connected to the upper end of the lifting and adjusting device through the rotating device, and the lower end of the lifting and adjusting device is connected to the fixing device. The fixing device is fixedly connected to the steel arch frame. The earth pressure cell is embedded in the fixing box and abuts against the tunnel arch. The wiring of the earth pressure cell passes through the wiring protection device and is connected to the measuring instrument.

[0008] Preferably, the fixing box includes a box body, a pressing device, and a tail circuit protection box;

[0009] The top of the box is provided with a fixed cavity, in which the earth pressure box is embedded. The top pressure device is set on the side wall of the box to apply pressure to the side wall of the earth pressure box. The tail line protection box is symmetrically arranged with the top pressure device. The tail line protection box is connected to the fixed cavity through a line groove. The tail line of the earth pressure box passes through the line groove, the tail line protection box and the line protection device in sequence to connect with the measuring instrument.

[0010] Preferably, the pressing device includes a screw rod and a rubber pad layer;

[0011] The side wall of the box is provided with a threaded hole, and a screw rod is fitted into the threaded hole. The end of the screw rod is connected to a rubber pad, which is used to apply pressure to the side wall of the earth pressure box.

[0012] Preferably, the lifting adjustment device includes a locking device, and an internal telescopic rod and an external support rod coaxially sleeved together;

[0013] The lower end of the external support rod is fixedly connected to the fixing device, the upper end of the internal telescopic rod is connected to the rotating device, and the locking device is set at the upper end of the external support rod for axial positioning of the internal telescopic rod.

[0014] Preferably, there are two lifting adjustment devices, which are arranged at a lateral interval along the tunnel, and the two lifting adjustment devices are connected to the fixed box through a rotating device.

[0015] Preferably, the rotating device includes two spaced-apart fixed plates, which are located at the bottom of the box and are rotatably connected to the upper end of the internal telescopic rod.

[0016] Preferably, the fixing device includes a base body, a through slot on the side wall of the base body for engaging with the flange plate of the steel arch frame, and a pressing device at the bottom of the base body.

[0017] Preferably, the line protection device includes a rubber hose, a tee pipe, a main channel pipe, and a bent tee pipe;

[0018] The rubber hose is fixed on the lifting and adjusting device. The upper end of the rubber hose is connected to the fixed box, and the lower end of the rubber hose is connected to the tee pipe. The two ends of the tee pipe are respectively connected to the main channel pipe. The main channel pipe is connected to the bend pipe. The bend pipe is set at the end of the steel arch frame. The tee pipe and the main channel pipe are respectively fixed to the steel arch frame by pipe fixers.

[0019] Preferably, the rubber hose is fixed to the lifting and adjusting device by a hose fixing clamp, and the tee pipe and the main channel pipe are respectively fixed to the steel arch frame by pipe fixing devices.

[0020] Preferably, the steel arch frame is provided with multiple earth pressure box fixing devices at intervals.

[0021] Compared with the prior art, the present invention has the following beneficial technical effects:

[0022] This invention provides an auxiliary installation device for a tunnel earth pressure cell. By combining a screw rod and a knob within a fixed box to form an easily adjustable screw, clockwise rotation of the knob secures the earth pressure cell, solving the problems of difficulty in fixing the earth pressure cell, its tendency to detach, and inaccurate measurement data. Secondly, a telescopic device controls the sliding of the internal telescopic rod to adjust to a suitable height. A rotating device then rotates the upper fixed box to a suitable angle, ensuring the earth pressure cell surface is tightly fitted to the excavated rock contour. This solves the problem of existing devices being unable to adjust height, limiting their use and making them inconvenient in areas with uneven excavation contours, thus improving the reliability and survival rate of earth pressure cell measurement data. Furthermore, the fixing device connects to a steel arch frame. Clockwise rotation of the easily adjustable screw rod and knob mechanically fixes the entire structure to the steel arch frame, solving the problems of complex construction operations and difficulty in fixing the earth pressure cell auxiliary installation device using existing welding methods. Finally, the line protection device is an assembled structure. Through the assembly of various pipes and pipe fasteners, the earth pressure cell instrument line is protected from the fixed box all the way to the outlet of the curved tee pipe for reading. Furthermore, the overall structure is modular and not limited by the curvature of the steel arch frame, making it highly adaptable.

[0023] Furthermore, the fixing box is equipped with a tail wiring protection box, which focuses on protecting the vulnerable position where the earth pressure box body is connected to the wiring.

[0024] Furthermore, a certain distance is left between the contact point between the rotating device and the internal telescopic tube to facilitate the rotation of the upper fixed box.

[0025] Furthermore, the telescopic device and the fixing device are divided into left and right side structures. The height of the left and right sides of the telescopic device can be adjusted to adapt to the curved steel arch frame, and then the fixing device is rotated and fixed.

[0026] Furthermore, after the device is installed, the instrument wiring enters the tee pipe through a rubber hose. All pipes are assembled into a complete instrument wiring protection device to prevent sprayed concrete from breaking the wiring and to improve the integrity of the earth pressure cell data at the measuring points. Attached Figure Description

[0027] Figure 1 This is an overall layout diagram of the earth pressure box auxiliary installation device of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of the earth pressure box auxiliary installation device of the present invention;

[0029] Figure 3 This is a side view of the earth pressure box auxiliary installation device of the present invention;

[0030] Figure 4 This is a top view of the fixing box of the present invention;

[0031] Figure 5 This is a schematic diagram of the tee pipe and the main channel pipe in this invention;

[0032] Figure 6 This is a schematic diagram of the curved tube structure in this invention;

[0033] Figure 7 This is a schematic diagram of the pipe fixation device structure in this invention;

[0034] Figure 8 This is a side view of the pipe fixator in this invention;

[0035] Figure 9 This is a schematic diagram of the hose fixing clamp structure in this invention;

[0036] Figure 10 This is a side view of the hose fixing clamp of the present invention.

[0037] In the diagram: 1. Fixing box; 2. Rotating device; 3. Lifting and adjusting device; 4. Hose clamp; 5. Fixing base; 6. Rubber hose; 7. Tee pipe; 8. Main channel pipe; 9. Bend pipe; 10. Pipe clamp; 11. Earth pressure box; 12. Steel arch frame; 101. Rotating knob; 102. Screw rod; 103. Rubber pad; 104. Wiring trough; 105. Tail wiring protection box; 106. Outlet hole; 201. Screw; 202. Nut; 203. Fixing plate. Knob 301, screw rod 302; fastener 303; internal telescopic rod 304; external support rod 305; left clamp 401; right clamp 402; fastener 403; upper fixing plate 501; lower fixing plate 502; screw rod 504; knob 505; wiring lead hole 701; pipe connector 901; pipe 903; knob 1003; screw rod 1004; rubber pad 1005; fixing plate 1006. Detailed Implementation

[0038] The present invention will now be described in further detail with reference to the accompanying drawings. These descriptions are intended to explain the invention and not to limit it.

[0039] See Figure 1-10 An auxiliary installation device for a tunnel earth pressure box includes an earth pressure box fixing device and a line protection device.

[0040] The earth pressure box fixing device is set between the steel arch frame and the tunnel arch. The earth pressure box fixing device includes a fixing box 1, a rotating device 2, a lifting and adjusting device 3, and a fixing device 5. The fixing box 1 is connected to the upper end of the lifting and adjusting device 3 through the rotating device. The lower end of the lifting and adjusting device 3 is connected to the fixing device 5. The fixing device 5 is fixedly connected to the steel arch frame. The earth pressure box is embedded in the fixing box 1 and abuts against the tunnel arch. The line protection device is laid on the steel arch frame 12. The line of the earth pressure box passes through the line protection device and is connected to the measuring instrument.

[0041] The fixed box 1 includes a box body, a top pressing device, and a tail wire protection box 105. A fixed cavity is provided on the top of the box body, and the earth pressure box is embedded in the fixed cavity. The top pressing device is provided on the side wall of the box body to apply pressure to the side wall of the earth pressure box. The tail wire protection box 105 is symmetrically arranged with the top pressing device and is located on the other side of the box body. The tail wire protection box 105 is connected to the fixed cavity through a wire groove 104. The tail wire of the earth pressure box passes through the wire groove 104, the tail wire protection box 105, and the wire protection device in sequence to connect with the measuring instrument.

[0042] The top pressure device includes a rotary knob 101, a screw rod 102, and a rubber pad 103. A threaded hole is provided on the side wall of the housing, and the screw rod 102 is fitted into the threaded hole. One end of the screw rod 102 is connected to the rotary knob 101, and the other end is connected to the rubber pad 103. The rubber pad 103 is used to apply pressure to the side wall of the earth pressure box, fixing it in the housing. The rubber pad 103 prevents the contact point between the earth pressure box and the screw rod from being squeezed and damaged. To ensure that the earth pressure box is securely fixed and its surface contacts the outline of the excavated surrounding rock, the fixing box needs to be larger than the pre-selected earth pressure box in the initial design, and its height is slightly lower than the earth pressure box.

[0043] The rotating device 2 includes two spaced-apart fixed plates 203. The fixed plates 203 are connected to the top of the lifting adjustment device 3 and are located at the bottom of the box. The fixed plates 203 and the lifting adjustment device 3 are rotatably connected by screws 201 and nuts 202. Since screws and nuts are used for mechanical fixation, the angle of the fixed box is adjusted by screws and nuts to adapt to the tunnel contour, and the structure is rotated and fixed by rotating the nuts clockwise.

[0044] The lifting adjustment device 3 includes a locking device, and an internal telescopic rod 304 and an external support rod 305 coaxially sleeved. The lower end of the external support rod 305 is fixedly connected to the fixing device 5, and the upper end of the internal telescopic rod 304 is rotatably connected to the fixing plate 203. The locking device is set at the upper end of the external support rod 305 and is used to axially position the internal telescopic rod 304. The fixing plate 203 is rotatably connected to the upper end of the internal telescopic rod 304.

[0045] The locking device includes a knob 301, a screw rod 302, and a fastener 303. The fastener 303 is located at the upper end of the external support rod 305. The screw rod 302 is radially arranged on the fastener 303. One end of the screw rod 302 passes through the external support rod 305 and abuts against the side wall of the internal telescopic rod 304. The knob 301 is connected to the other end of the screw rod 302 and is located outside the fastener 303.

[0046] The lifting adjustment device 3 consists of two devices arranged laterally along the tunnel. The two lifting adjustment devices 3 are respectively connected to two hinge seats. The angle of the earth pressure box can be adjusted by the length of the two telescopic rods, so that the earth pressure box abuts against the tunnel roof.

[0047] The fixing device 5 includes a base body, and a through slot is provided on the side wall of the base body. The slot is used to engage with the flange plate of the steel arch frame. The top and bottom of the slot form an upper fixing plate 501 and a lower fixing plate 502. A screw rod 504 is provided on the lower fixing plate 502. The upper end of the screw rod 504 extends into the slot, and the lower end of the screw rod 504 is connected to a knob 505.

[0048] The line protection device includes a rubber hose 6, a tee pipe 7, a main channel pipe 8, and a bent tee pipe 9. The rubber hose 6 is fixed to the lifting and adjusting device 3 by a hose fixing clamp 4. The upper end of the rubber hose 6 is connected to the tail line protection box 105 through the outlet hole 106. The lower end of the rubber hose 6 is connected to the tee pipe 7. The two ends of the tee pipe 7 are respectively connected to the main channel pipe 8. The main channel pipe 8 is connected to the bent pipe 9. The bent pipe 9 is set at the end of the steel arch frame. The tee pipe 7 and the main channel pipe 8 are respectively fixed to the steel arch frame by pipe fixing devices 10. The earth pressure box line passes through the rubber hose 6, the tee pipe 7, the main channel pipe 8, and the bent pipe 9 in sequence and is then connected to the measuring instrument. The inlet end of the tee pipe 7 is provided with a line lead hole 701. The two outlet ends of the tee pipe 7 are connected to the main channel pipe 8 through threaded sleeves. The bend pipe 9 includes a pipe connector 901 and a pipe 903. The pipe 903 is a right-angle pipe. One end of it is connected to the main channel pipe 8 through the pipe connector 901, and the other end is the line outlet. The measuring instrument line is transferred from the outside of the steel arch frame to the inside of the steel arch frame through the right-angle pipe.

[0049] The hose fixing clamp 4 includes a left clamp 401, a right clamp 402, and a locking element 403. The left clamp 401 and the right clamp 402 are symmetrically arranged, and both the left clamp 401 and the right clamp 402 are provided with arc-shaped grooves. The left clamp 401 and the right clamp are wrapped around the external support rod 305 through the arc-shaped grooves. The two ends of the left clamp 401 and the right clamp 402 are connected by fasteners 403 respectively. The rubber hose is located in the arc-shaped groove. Multiple hose fixing clamps 4 are provided on the external support rod 305 from top to bottom, so that the rubber hose is fixed on the outer wall of the external support rod 305.

[0050] The pipe fastener 10 includes two symmetrically arranged fixing bodies. Each fixing body includes a pipe fixing part, a fixing plate 1006, and a fastening device. The pipe fixing part is provided with an arc-shaped groove. The lower end of the pipe fixing part is connected to the fixing plate 1006. The end of the fixing plate 1006 is provided with a C-shaped slot for locking onto the flange plate of the steel arch frame 12. A screw rod 1004 is provided at the bottom of the slot. One end of the screw rod 1004 is located in the slot and is provided with a rubber pad 1005. The other end of the screw rod 1004 is connected to a knob 1003. The two fixing bodies are symmetrically arranged on both sides of the pipe to form a clamp structure. The pipe fixing part is connected by bolts 1001 and nuts 1002.

[0051] The earth pressure cell is a pressure sensor that measures earth pressure, specifically a steel wire sensor or a cartridge sensor, and is usually circular in shape.

[0052] Example 1

[0053] In this embodiment, the tunnel adopts a three-stage excavation method. The initial support generally consists of a steel arch frame and shotcrete. The earth pressure box auxiliary installation device is fixed on the initial support steel arch frame. The fixing method of the earth pressure box auxiliary installation device is as follows:

[0054] First, place the earth pressure box 11 in the fixed box 1, and mechanically fasten the earth pressure box by rotating the knob 101. When placing the earth pressure box 11, the tail lead wire enters the upper closed tail line protection box 105 through the line groove 104, and enters the rubber hose 6 and line protection device through the wire outlet hole 106.

[0055] Adjust the height of the telescopic device until the internal telescopic rod is at a suitable height. Then, rotate the screw clockwise to fix the internal telescopic rod 304.

[0056] Place one side of the steel arch flange into the slot in the fixing device 5, rotate the screw clockwise, and the screw rod 504 and knob 505 move upward until they contact the steel arch for mechanical fixing.

[0057] For tunnels with irregular excavation contours, after installation, the earth pressure box 11 is adjusted to conform to the tunnel contour by using the rotating device 2. The specific fixing method is as follows: the upper part of the internal telescopic rod 304 is placed in the middle of the fixing plate 203 and mechanically fixed by screws 201 and nuts 202. The nuts on both sides are rotated counterclockwise to move outwards, loosening the structure. After adjusting the angle of the fixing box 1 to fit the tunnel contour, the nuts are rotated clockwise to fix the structure. The earth pressure box installation is now complete.

[0058] After the earth pressure cell fixing device is fixed, select the distance from the outlet hole 106 to the side lead hole 701 of the tee pipe 7, according to the height of the fixing device, and fix the hose 6 to the external support rod 302 with hose fixing clamps 4. The hose fixing clamps 4 are set every 20cm. If the extension height of the internal telescopic pipe 3044 is greater than 20cm, the rubber hose 6 also needs to be fixed, depending on the height of the earth pressure cell fixing device. The lines of each measuring point enter the main channel pipe 8 through the tee pipe 7, and each pipe is fixed to the back of the steel arch frame by the pipe fixing device 10. The line reading is taken from the outlet of the curved tee pipe 9.

[0059] The tunnel was excavated using a three-stage method. After the upper stage was excavated and the steel arch frame was erected, an earth pressure box was installed at the top of the arch, and the instrument wiring was extended to the side via spliced ​​pipes. The instruments and pipes were installed in the order of the left arch shoulder and then the right arch shoulder.

[0060] After the steps in the tunnel were excavated, instruments and pipelines were installed in the middle of the steel arch frames on the left and right side walls according to the actual construction progress.

[0061] After the tunnel's lower steps were excavated and steel arch frames were erected, instruments and pipelines were installed at the middle of the arch feet on both the left and right sides, according to the actual construction progress.

[0062] After the tunnel invert is excavated, instruments are installed at the middle position of the bottom of the invert, and instruments are installed on the steel arch frames on both sides of the invert according to the construction excavation sequence.

[0063] At each excavation stage, the instrument reading position is different. After taking the reading at the outlet of the bend pipe 9, the bend tee pipe 9 can be removed and replaced with the main channel pipe 8 in its original position. After the instrument line is rolled up, it is placed inside the main channel pipe 8. As the step method continues to excavate, the remaining pipes are gradually assembled and the line is extended until the next reading position is reached, until the measurement of this section is completed.

[0064] This invention provides an auxiliary installation device for tunnel earth pressure cells, comprising two parts: an earth pressure cell fixing device and a line protection device. The earth pressure cell fixing device includes a main body, a rotating device, a telescopic device, and a base fixing device. The fixing device uses easily adjustable screws to rotate and fix the earth pressure cell. The rotating device can be used to adjust the angle of the fixing device, making the earth pressure cell fit more closely to the excavation profile. The telescopic device can adjust the height of the device, suitable for situations with uneven tunnel excavation profiles under over- or under-excavation conditions. The base fixing device is suitable for initial support steel arch structures, using screws to rotate and fix the steel arch to the fixing device. The instrument lead protection device mainly includes a rubber hose, a tee pipe, a main channel pipe, and a final bent tee pipe, used to connect and protect the instrument lines. This invention focuses on the installation and protection of tunnel earth pressure cells and lines. The fixing device installs the earth pressure cell using mechanical fixing with nuts, employing an integrated assembly to protect the instruments and lines. It is easy to operate, suitable for areas with complex excavation profiles, reduces damage to the earth pressure cell and lines during construction, and ensures the accuracy of measurement results.

[0065] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. An auxiliary installation device for a tunnel earth pressure cell, characterized in that, It includes a soil pressure box fixing device and a line protection device. The soil pressure box fixing device is set between the steel arch frame and the tunnel arch, and the line protection device is laid on the steel arch frame (12) according to the shape. The earth pressure box fixing device includes a fixing box (1), a rotating device (2), a lifting adjustment device (3) and a fixing device (5). The fixing box (1) is connected to the upper end of the lifting adjustment device (3) through the rotating device. The lower end of the lifting adjustment device (3) is connected to the fixing device (5). The fixing device (5) is fixedly connected to the steel arch frame. The earth pressure box is embedded in the fixing box (1) and abuts against the tunnel arch. The earth pressure box's wiring passes through the wiring protection device and is connected to the measuring instrument. The line protection device includes a rubber hose (6), a tee pipe (7), a main channel pipe (8), and a curved tee pipe (9); The rubber hose (6) is fixed on the lifting adjustment device (3). The upper end of the rubber hose (6) is connected to the fixed box (1). The lower end of the rubber hose (6) is connected to the three-way pipe (7). The two ends of the three-way pipe (7) are respectively connected to the main channel pipe (8). The main channel pipe (8) is connected to the curved three-way pipe (9). The curved three-way pipe (9) is set at the end of the steel arch frame. The three-way pipe (7) and the main channel pipe (8) are respectively fixed on the steel arch frame by the pipe fixer (10). The rubber hose (6) is fixed to the lifting adjustment device (3) by the hose fixing clamp (4), and the three-way pipe (7) and the main channel pipe (8) are respectively fixed to the steel arch frame by the pipe fixing device (10).

2. The tunnel earth pressure cell auxiliary installation device according to claim 1, characterized in that, The fixing box (1) includes a box body, a pressing device and a tail line protection box (105); The top of the box body is provided with a fixed cavity, the earth pressure box is embedded in the fixed cavity, the top pressure device is set on the side wall of the box body, and is used to apply pressure to the side wall of the earth pressure box. The tail line protection box (105) is symmetrically arranged with the top pressure device. The tail line protection box (105) is connected to the fixed cavity through the line groove (104). The tail line of the earth pressure box passes through the line groove (104), the tail line protection box (105) and the line protection device in sequence and is connected to the measuring instrument.

3. The tunnel earth pressure cell auxiliary installation device according to claim 2, characterized in that, The top-pressing device includes a screw rod (102) and a rubber pad layer (103); The side wall of the box is provided with a threaded hole, and a screw rod (102) is fitted in the threaded hole. The end of the screw rod (102) is connected to a rubber pad (103), which is used to apply pressure to the side wall of the earth pressure box.

4. The tunnel earth pressure cell auxiliary installation device according to claim 1, characterized in that, The lifting adjustment device (3) includes a locking device, and an internal telescopic rod (304) and an external support rod (305) coaxially sleeved. The lower end of the external support rod (305) is fixed to the fixing device (5), the upper end of the internal telescopic rod (304) is connected to the rotating device, and the locking device is set at the upper end of the external support rod (305) for axial positioning of the internal telescopic rod (304).

5. The tunnel earth pressure cell auxiliary installation device according to claim 4, characterized in that, There are two lifting adjustment devices (3), which are arranged at a lateral interval along the tunnel. The two lifting adjustment devices (3) are connected to the fixed box through a rotating device.

6. The tunnel earth pressure cell auxiliary installation device according to claim 4, characterized in that, The rotating device (2) includes two spaced-apart fixed plates (203), which are located at the bottom of the box and are rotatably connected to the upper end of the internal telescopic rod (304).

7. The tunnel earth pressure cell auxiliary installation device according to claim 1, characterized in that, The fixing device (5) includes a base body, and a through slot is provided on the side wall of the base body for engaging with the flange plate of the steel arch frame. A pressing device is provided at the bottom of the base body.

8. The tunnel earth pressure cell auxiliary installation device according to claim 1, characterized in that, Multiple earth pressure box fixing devices are installed at intervals on the steel arch frame.

Images