A shield tunnel earth pressure box fixing device and installation method

Abstract

The present invention relates to the field of tunnel engineering technology, and specifically to a shield tunnel earth pressure box fixing device; the adopted technical scheme is: a shield tunnel earth pressure box fixing device, including an earth pressure box fixing device body and a mounting seat, the mounting seat is used to install the earth pressure box, the bottom end of the mounting seat is provided with a support rod, the support rod is covered with a fixed base, and the position of the fixed base in the length direction of the support rod is adjustable; the mounting seat is installed in the grouting body behind the segment wall when in use, so that the upper end of the earth pressure box is close to the tunnel surrounding rock; the fixed base is inserted into the shield segment when in use, and is fixedly connected to the shield segment. After the shield segment and the grouting body behind the segment wall are constructed, the present invention can avoid damage to the earth pressure box caused by grouting and avoid grouting affecting the accuracy of earth pressure box measurement.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel engineering, and in particular to a shield tunnel earth pressure box fixing device and an installation method. Background Art

[0002] Shield tunnel construction has the advantages of fast excavation speed, good construction quality, small disturbance to surrounding rock, and no impact on ground transportation and facilities. In recent years, it has been widely used in tunnel construction in industries such as water conservancy and hydropower, rail transportation, railways, and highways. Due to the complex geological conditions of tunnel engineering, it is greatly affected by fault fracture zones, groundwater, and surrounding rock types, and the requirements for surrounding rock deformation control are extremely high. During construction, instruments such as earth pressure cells, rebar meters, and strain gauges are usually used to measure parameters such as stress and strain of tunnel surrounding rocks to evaluate the deformation trend, degree, and stability of tunnel surrounding rocks.

[0003] At present, the implementation plan of the earth pressure box fixture of the shield tunnel is: make the top of the earth pressure box fixture flush with the outer wall of the prefabricated shield segment, then weld the earth pressure box fixture to the steel bars in the shield segment, temporarily seal the top of the earth pressure box fixture, and finally cast the shield segment in the shield segment template. This fixed installation method mainly has the following problems: First, the earth pressure box installed in the shield segment is easy to fall off or even damaged; second, the earth pressure box is not in direct contact with the tunnel surrounding rock, but indirectly contacts the tunnel surrounding rock through the grouting body behind the segment wall, resulting in large errors in the measurement data; and when the grouting filling behind the shield segment wall is incomplete, the grouting body and the earth pressure box will be in uneven contact or the pea gravel will be in point-to-point contact with the earth pressure box measuring surface, causing the measurement data error to further increase; third, the grouting pressure behind the shield segment wall is relatively large, and the earth pressure box is easily damaged during grouting; fourth, after the grouting slurry hardens, it is easy for the earth pressure box, the earth pressure box fixing device, the shield segment, and the hardened grouting body to form a whole, so that the earth pressure box no longer has the function of measuring earth pressure. Summary of the invention

[0004] In view of the technical problems that the existing earth pressure boxes in shield tunnels are easy to fall off, easy to be damaged, have large measurement errors and are easy to fail, the present invention provides a fixing device for earth pressure boxes in shield tunnels, which can ensure that the earth pressure boxes are firmly and reliably installed, avoid grouting behind the shield segment wall affecting the measurement results of the pressure boxes or causing damage, and ensure that the data measured by the pressure boxes are reliable and accurate.

[0005] The present invention is achieved through the following technical solutions:

[0006] A shield tunnel earth pressure box fixing device comprises an earth pressure box fixing device body and a mounting seat, wherein the mounting seat is used to install the earth pressure box, a support rod is provided at the bottom end of the mounting seat, a fixing base is provided on the outer sleeve of the support rod, and the position of the fixing base in the length direction of the support rod is adjustable; when in use, the mounting seat is installed in a grouting body behind a segment wall so that the upper end of the earth pressure box is close to the tunnel surrounding rock; when in use, the fixing base is inserted into a shield segment and fixedly connected to the shield segment.

[0007] After the shield segment and the grouting body behind the segment wall are constructed, the present invention fixes the earth pressure box through the earth pressure box fixing device body; the fixing base of the fixing device is fixedly connected to the shield segment, and the position of the fixing base in the length direction of the support rod at the lower end of the mounting seat is adjustable, so that the earth pressure box and the tunnel surrounding rock are in direct contact with each other according to the set initial pressure. It can avoid grouting from causing damage to the earth pressure box and avoid grouting from affecting the accuracy of earth pressure box measurement. Therefore, the error of the earth pressure box measurement result is small, and the monitoring result can accurately reflect the earth pressure of the tunnel surrounding rock.

[0008] Furthermore, the fixed base is provided with grouting holes through it, and the grouting holes are used to grout the space between the fixed base and the mounting seat. Concrete is poured through the grouting holes to completely fill the gap between the earth pressure box fixing device body and the shield segment and the grouting body behind the segment, forming a mounting hole grouting body that is tightly bonded to the shield segment and the grouting body behind the segment, thereby ensuring the integrity of the shield segment and the grouting body behind the segment wall.

[0009] Furthermore, a slurry-stopping ring is fixed to the bottom end of the mounting seat, and the slurry-stopping ring is used to prevent slurry from entering the mounting seat to protect the soil pressure box.

[0010] Preferably, the support rod is a screw rod, the fixed base is provided with a through hole, and the support rod is inserted into the through hole. The position of the fixed base is adjusted by the screw rod, so that the position adjustment of the fixed base is simple and convenient, and the adjustment linearity is good.

[0011] As a specific implementation of the position adjustment of the fixed base: the support rod is sleeved with an inner nut and an outer nut, and the inner nut and the outer nut are used to adjust the position of the fixed base in the length direction of the support rod. Furthermore, it also includes a mounting sleeve, which is inserted into the shield segment when in use and is fixedly connected to the shield segment; the mounting sleeve is a threaded tube, and the outer side wall of the fixed base is provided with an external thread that matches the mounting sleeve, and the mounting sleeve is threadedly connected to the fixed base when in use.

[0012] Preferably, a mounting nut is also fixed to the bottom of the fixed base, the mounting nut is concentrically arranged with the through hole, and the minor diameter of the mounting nut is larger than the outer diameter of the outer nut, so as to facilitate the adjustment of the position of the fixed base.

[0013] Furthermore, the mounting seat is in the shape of a concave disk, and a rubber ring is fixed in the mounting seat, and the rubber ring is used to fix the earth pressure box. The earth pressure box is fixed by the rubber ring, and the position of the earth pressure box in the mounting seat can be changed while being fixed, so as to protect the earth pressure box.

[0014] Preferably, the support rod is a hollow rod, the bottom of the mounting seat is provided with a threading hole, the threading hole is connected to the support rod cavity; the bottom of the mounting seat is provided with a threading groove, the threading groove is connected to the threading hole, the support rod cavity, the threading hole and the threading groove are used to lay the cable of the earth pressure box. The cable of the earth pressure box can be passed directly through the support rod, which can protect the cable and does not need to add other structures to pass the cable.

[0015] The present invention also provides a method for installing the above-mentioned shield tunnel earth pressure box fixing device, comprising the following steps:

[0016] Assembling the earth pressure cell fixture body and fixing the earth pressure cell on the earth pressure cell fixture body;

[0017] The installation sleeve is fixedly connected to the steel bars in the shield segment, both ends of the installation sleeve are sealed, and then the shield segment is cast in the shield segment template;

[0018] Install shield segments and inject grout into the gap between the shield segments and the tunnel surrounding rock to form a grouting body behind the segment wall;

[0019] The end plug in the installation casing is taken out, and an installation channel is drilled in the grouting body behind the segment wall through the installation casing, the installation channel is drilled to the tunnel surrounding rock, and the tunnel surrounding rock at the end of the installation channel is ground flat;

[0020] Install the earth pressure box fixture body in the installation channel, connect the earth pressure box cable to the reading instrument, and judge whether the earth pressure box is in full contact with the tunnel surrounding rock by observing the data changes of the reading instrument, and then fix the fixing base to the installation sleeve;

[0021] Grouting is performed into the installation sleeve and the installation channel to complete the fixed installation of the earth pressure box.

[0022] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0023] 1. The support rod at the bottom of the mounting seat is covered with a fixed base, and the position of the fixed base in the length direction of the support rod is adjustable; the mounting seat is installed in the grouting body behind the segment wall when in use, so that the upper end of the earth pressure box is close to the tunnel surrounding rock; the fixed base is inserted into the shield segment when in use and is fixedly connected to the shield segment. After the shield segment and the grouting body behind the segment wall are constructed, the earth pressure box is fixed by the earth pressure box fixing device body, the fixed base of the fixing device body is fixedly connected to the shield segment, and the position of the fixed base in the length direction of the support rod at the lower end of the mounting seat is adjustable, so that the earth pressure box is in direct contact with the tunnel surrounding rock according to the set initial pressure. It can avoid grouting from damaging the earth pressure box and avoiding grouting from affecting the accuracy of earth pressure box measurement. Therefore, the error of the earth pressure box measurement result is small, and the monitoring result can accurately reflect the earth pressure of the tunnel surrounding rock.

[0024] 2. The grout stop ring can prevent the grout injected after the device is installed from overflowing to the earth pressure box and the tunnel surrounding rock, affecting the measurement effect of the earth pressure box.

[0025] 3. The device is equipped with wire grooves and wire holes, which can pass the cables directly through the support rods without adding other structures to pass the cables.

[0026] 4. The device is fixed in the installation sleeve through a fixed base, has sufficient operating space and is easy to install.

[0027] 5. After the device is installed, pour concrete into the installation sleeve and installation channel through the grouting hole to completely fill the gap, forming an installation hole grouting body that is tightly bonded to the installation sleeve and installation channel. This repairs the integrity of the shield segment and the grouting body behind the segment wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0029] Figure 1 It is a schematic structural diagram of the earth pressure box fixing device of the present invention;

[0030] Figure 2 It is a top view schematic diagram of the earth pressure box fixing device of the present invention;

[0031] Figure 3 It is a schematic diagram of the installation of the earth pressure box fixing device of the present invention.

[0032] Marks and corresponding parts names in the attached drawings:

[0033] 1-soil pressure box fixing device body, 2-shield segment, 3-grouting body behind the segment wall, 4-tunnel surrounding rock, 5-grouting body of the mounting hole, 6-mounting seat, 7-threading hole, 8-threading groove, 9-rubber ring, 10-step, 11-fixing ring, 12-stop grouting ring, 13-support rod, 14-fixing base, 15-inner nut, 16-mounting nut, 17-stop grouting pad, 18-grouting hole, 19-outer nut, 20-through hole, 21-soil pressure box, 22-cable, 23-mounting sleeve, 24-mounting channel. DETAILED DESCRIPTION

[0034] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0035] Example

[0036] A shield tunnel earth pressure box fixing device comprises an earth pressure box fixing device body 1 and a mounting seat 6, wherein the mounting seat 6 is used to install an earth pressure box 21. The earth pressure box 21 is a pressure sensor for measuring earth pressure, which is usually a steel string type, ink cartridge type or other sensor, and is usually circular in shape. In the embodiment, the mounting seat 6 is made into a disc shape. A support rod 13 is provided at the bottom end of the mounting seat 6, and a fixed base 14 is provided on the outer sleeve of the support rod 13. The position of the fixed base 14 in the length direction of the support rod 13 is adjustable; the fixed base 14 can be threadedly connected to the support rod 13, pinned or other means to achieve the adjustable position of the fixed base 14 in the length direction of the support rod 13. When in use, the mounting seat 6 is installed in the grouting body 3 behind the segment wall, so that the upper end of the earth pressure box 21 is close to the tunnel surrounding rock 4; when in use, the fixed base 14 is inserted into the shield segment 2 and fixedly connected to the shield segment 2.

[0037] It should be noted that the shield segment 2 is the main assembly component of the shield construction and the innermost barrier of the tunnel. It is responsible for resisting soil pressure, groundwater pressure and some special loads. Generally, multiple shield segments 2 are spliced ​​into a closed ring in the tunnel. After the shield segments 2 are assembled, there is a gap between the outer side of the shield segment 2 and the soil. The gap needs to be filled by grouting behind the segment wall to prevent the shield segment 2 and the soil from settling. After the slurry solidifies and is cured, it becomes a complete grouting body. In this embodiment, the grouting body is called the grouting body 3 behind the segment wall.

[0038] In this embodiment, after the shield segment 2 and the grouting body 3 behind the segment wall are constructed, the earth pressure box 21 is fixed by the earth pressure box fixing device body 1; the fixing base 14 of the fixing device body is fixedly connected to the shield segment 2, and the position of the fixing base 14 in the length direction of the support rod 13 at the lower end of the mounting seat 6 is adjustable, so that the earth pressure box 21 is in direct contact with the tunnel surrounding rock 4 according to the set initial pressure. It can avoid grouting from causing damage to the earth pressure box 21 and avoid grouting from affecting the accuracy of the measurement of the earth pressure box 21. Therefore, the measurement result error of the earth pressure box 21 is small, and the monitoring result can accurately reflect the earth pressure of the tunnel surrounding rock.

[0039] Furthermore, the fixed base 14 is provided with a grouting hole 18, and the grouting hole 18 is used to grout the space between the fixed base 14 and the mounting base 6. Concrete is poured through the grouting hole 18 to completely fill the gap between the earth pressure box fixing device body 1 and the shield segment 2 and the grouting body 3 behind the segment, forming a mounting hole grouting body 5 that is tightly bonded to the shield segment 2 and the grouting body 3 behind the segment, ensuring the integrity of the shield segment 2 and the grouting body 3 behind the segment wall, and ensuring the structural strength and stability of the tunnel.

[0040] Furthermore, a grout-stopping ring 12 is fixed to the bottom of the mounting seat 6, and the grout-stopping ring 12 is used to prevent grout from entering the mounting seat 6, so as to protect the earth pressure box 21 and ensure the accuracy of the measurement result of the earth pressure box 21. In this embodiment, the following method is used for fixing: a step 10 is provided at the bottom of the mounting seat 6, a threaded hole is provided in the middle of the step 10, and the grout-stopping ring 12 is sleeved outside the step 10; then a fixing ring 11 is screwed to the bottom of the step 10 to fix the grout-stopping ring 12. It can be understood that the outer diameter of the fixing ring 11 is smaller than the outer diameter of the grout-stopping ring 12, and the inner diameter of the fixing ring 11 is larger than the inner diameter of the grout-stopping ring 12.

[0041] In order to ensure the reliability of the stop ring 12 and reduce the resistance when installing the earth pressure box fixture body 1, the stop ring 12 has a hollow conical cross section, with both ends being horizontal planes, and the lower outer diameter is larger than the upper outer diameter. The stop ring 12 is generally made of rubber material, such as EPDM rubber, polytetrafluororubber, etc.

[0042] Preferably, the support rod 13 is a screw rod, and the fixed base 14 is provided with a through hole 20. It can be understood that the through hole 20 is concentrically arranged with the fixed base 14, and the support rod 13 is passed through the through hole 20. The position of the fixed base 14 is adjusted by the screw rod, so that the position adjustment of the fixed base 14 is simple and convenient, and the adjustment linearity is good.

[0043] As a specific implementation of the position adjustment of the fixed base 14: the support rod 13 is sleeved with an inner nut 15 and an outer nut 19, and the inner nut 15 and the outer nut 19 are used to adjust the position of the fixed base 14 in the length direction of the support rod 13. Specifically, the inner nut 15 is used to limit the position of the fixed base 14 to the mounting seat 6, and the outer nut 19 is used to fix the solid base 14.

[0044] Furthermore, it also includes an installation sleeve 23, which is inserted into the shield segment 2 when in use and fixedly connected to the shield segment 2, that is, the earth pressure box fixing device body 1 is fixed by the installation sleeve 23. Specifically, the installation sleeve 23 is a threaded tube, and the outer side wall of the fixing base 14 is provided with an external thread adapted to the installation sleeve 23, and the installation sleeve 23 is threadedly connected to the fixing base 14 when in use.

[0045] Preferably, a mounting nut 16 is also fixed to the bottom of the fixed base 14 , and the mounting nut 16 is concentrically arranged with the through hole 20 . The minor diameter of the mounting nut 16 is larger than the outer diameter of the outer nut 19 , so as to facilitate the adjustment of the position of the fixed base 14 .

[0046] Further, the mounting seat 6 is in the shape of a concave disk, and a rubber ring 9 is fixed in the mounting seat 6, and the rubber ring 9 is used to fix the earth pressure box 21. The earth pressure box 21 is fixed by the rubber ring 9, and the position of the earth pressure box 21 in the mounting seat 6 can be changed while being fixed, so as to protect the earth pressure box 21.

[0047] Preferably, the support rod 13 is a hollow rod, the bottom of the mounting seat 6 is provided with a threading hole 7, the threading hole 7 is communicated with the cavity of the support rod 13; the bottom of the mounting seat 6 is provided with a threading groove 8, the threading groove 8 is communicated with the threading hole 7, the cavity of the support rod 13, the threading hole 7, and the threading groove 8 are used to lay the cable 22 of the earth pressure box 21. The cable 22 of the earth pressure box 21 can be directly passed through the support rod 13, which can protect the cable, and no other structure needs to be added to pass the cable 22.

[0048] In order to prevent the rubber ring 9 from squeezing the cable 22 of the soil pressure box 21 and damaging the cable 22, the rubber ring 9 is a C-shaped rubber ring; or a groove is provided in the rubber ring 9, and the groove or the notch is aligned with the threading groove 8 when in use.

[0049] The installation method of this embodiment includes the following steps:

[0050] 1. Assemble the earth pressure box fixture body 1 and fix the earth pressure box on the earth pressure box fixture body 1:

[0051] Lead the cable 22 of the earth pressure box 21 into the cavity of the support rod 21 through the threading groove 8 and the threading hole 7 and pass it out;

[0052] Place the earth pressure box 21 into the mounting seat 6, and place the rubber ring 9 into the gap between the earth pressure box 21 and the inner wall of the mounting seat 6 to fix the earth pressure box 21;

[0053] Put the stop ring 12 on the outside of the step 10, and then tighten the fixing ring 11 and the step 10 to fix the stop ring 12;

[0054] Screw the inner nut 15 into any position of the support rod 13, then put the fixed base 14 on the outside of the support rod 13 through the through hole 20, then put the stop slurry pad 17 on the outside of the support rod 13, and screw the outer nut 19 into the support rod 13, that is, the fixed base 14 and the stop slurry pad 19 are located between the inner nut 15 and the outer nut 19.

[0055] 2. The installation sleeve 23 is fixedly connected to the steel bars in the shield segment 2, and the two ends of the installation sleeve 23 are sealed with end plugs, and then the shield segment 2 is cast in the shield segment 2 template.

[0056] 3. Install the shield segment 2: After the shield machine advances to the monitoring section, install the shield segment 2 to form a shield pipe, and then inject grout into the gap between the shield segment 2 and the tunnel surrounding rock 4 to form a grouting body 3 behind the segment wall.

[0057] 4. Drilling and installation channel 24:

[0058] After the grouting body 3 behind the segment wall is finally set, the end plug in the installation sleeve 23 is taken out;

[0059] Install a small drilling machine, and use the installation casing 23 to drill the installation channel 24 in the grouting body 3 behind the segment wall until the tunnel surrounding rock 4, that is, drill the installation channel 24 in the grouting body 3 behind the segment wall through the installation casing 23;

[0060] The installation channel 24 is drilled to the tunnel surrounding rock 4, and the diameter of the installation channel 24 is larger than the outer diameter of the fixing ring 11 and smaller than the outer diameter of the stop ring 12;

[0061] After the installation channel 24 is drilled, the tunnel surrounding rock 4 at the end of the installation channel 24 is ground flat with a bottom-of-hole flattening drill bit;

[0062] The installation channel 24, the installation sleeve 23 and the tunnel surrounding rock at the end of the installation channel 24 are cleaned.

[0063] 5. Install and fix the earth pressure cell fixture body 1:

[0064] The earth pressure box fixture body 1 is installed in the installation channel 24, and the cable 22 of the earth pressure box 21 is connected to the reading instrument. By observing the data changes of the reading instrument, it is determined whether the earth pressure box 21 is in full contact with the tunnel surrounding rock 4;

[0065] Then the fixing base 14 is fixedly connected to the mounting sleeve 23 .

[0066] 6. Pour concrete from the grouting hole 18 into the mounting sleeve 23 and the mounting channel 24 to completely fill the gap, forming a mounting hole grouting 5 that is tightly bonded to the earth pressure box fixture body 1, the mounting sleeve 23, and the mounting channel 24, and completing the fixed installation of the earth pressure box 21.

[0067] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A shield tunnel earth pressure box fixing device, comprising an earth pressure box fixing device body (1) and a mounting seat (6), wherein the mounting seat (6) is used to install an earth pressure box (21), characterized in that: A support rod (13) is provided at the bottom end of the mounting seat (6), a fixed base (14) is provided on the outer cover of the support rod (13), and the position of the fixed base (14) in the length direction of the support rod (13) is adjustable; It also includes an installation sleeve (23), wherein the installation sleeve (23) is fixedly connected to the steel bars of the shield segment (2) before the shield segment (2) is cast, and end plugs are used to seal both ends of the installation sleeve (23), so as to be fixedly connected to the shield segment (2) after the shield segment (2) is cast; The installation sleeve (23) is a threaded tube, and the outer wall of the fixed base (14) is provided with an external thread that matches the installation sleeve (23). When in use, the installation sleeve (23) is threadedly connected to the fixed base (14), and the fixed base (14) is fixedly connected to the shield segment (2) through the installation sleeve (23); After the grouting body is formed behind the wall of the segment, an installation channel (24) is drilled through the installation sleeve (23) to the tunnel surrounding rock (4), and the installation seat (6) is installed in the installation channel (24) so ​​that the upper end of the earth pressure box (21) is close to the tunnel surrounding rock (4); The fixed base (14) is provided with a grouting hole (18) extending therethrough, and the grouting hole (18) is used to inject grout into the space between the fixed base (14) and the mounting seat (6); The support rod (13) is a screw rod, the fixed base (14) is provided with a through hole (20), and the support rod (13) is inserted into the through hole (20); The support rod (13) is sleeved with an inner nut (15) and an outer nut (19); the inner nut (15) is located on a side of the fixed base (14) facing the mounting seat (6); the outer nut (19) is located on a side of the fixed base (14) away from the mounting seat (6); the inner nut (15) and the outer nut (19) are used to adjust the position of the fixed base (14) in the length direction of the support rod (13); A mounting nut (16) is also fixed to the bottom of the fixed base (14), the mounting nut (16) is arranged concentrically with the through hole (20), and the minor diameter of the mounting nut (16) is larger than the outer diameter of the outer nut (19); The mounting seat (6) is in the shape of a concave disk, and a rubber ring (9) is fixed inside the mounting seat (6), and the rubber ring (9) is used to fix the soil pressure box (21).

2. The shield tunnel earth pressure box fixing device according to claim 1 is characterized in that: A slurry-stopping ring (12) is also fixed to the bottom end of the mounting seat (6), and the slurry-stopping ring (12) is used to prevent slurry from entering the mounting seat (6).

3. The shield tunnel earth pressure box fixing device according to claim 1 is characterized in that: The support rod (13) is a hollow rod. A threading hole (7) is provided at the bottom of the mounting seat (6), and the threading hole (7) is communicated with the cavity of the support rod (13). A threading groove (8) is provided at the bottom of the mounting seat (6), and the threading groove (8) is communicated with the threading hole (7). The cavity of the support rod (13), the threading hole (7), and the threading groove (8) are used for laying cables (22) of the earth pressure box (21).

4. A method for installing an earth pressure cell in a shield tunnel, characterized in that: The method comprises the shield tunnel earth pressure box fixing device according to any one of claims 1 to 3, and the method comprises the following steps: Assembling the earth pressure cell fixture body and fixing the earth pressure cell on the earth pressure cell fixture body; The installation sleeve is fixedly connected to the steel bars in the shield segment, both ends of the installation sleeve are sealed, and then the shield segment is cast in the shield segment template; Install shield segments and inject grout into the gap between the shield segments and the tunnel surrounding rock to form a grouting body behind the segment wall; The end plug in the installation casing is taken out, and an installation channel is drilled in the grouting body behind the segment wall through the installation casing, and the installation channel is drilled to the surrounding rock of the tunnel; Install the earth pressure cell fixture body in the installation channel and fix it to the installation sleeve; Grouting is performed into the installation sleeve and the installation channel to complete the fixed installation of the earth pressure box.

5. The method for installing the earth pressure cell of a shield tunnel according to claim 4, characterized in that: When installing the earth pressure box fixture, connect the cable of the earth pressure box to the reading instrument, and judge whether the earth pressure box is in full contact with the tunnel surrounding rock by observing the changes in the data of the reading instrument.

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