A detection device and method for preventing the back of a tunnel waterproofing board from falling out

Abstract

The present invention discloses a detection device and a detection method for preventing the back of a tunnel waterproofing board from being emptied. The waterproofing board is arranged between the initial support and the secondary lining. The detection device comprises a detection feedback body and a signal receiver. The detection feedback body is fixed on the initial support and connected to the signal receiver through a wire. The signal receiver is installed on a mobile stand. The detection method comprises: step 1: performing cross-section detection before hanging the waterproofing board, marking the positions of the initial support shotcrete depressions one by one, and numbering them; step 2: installing the pressure strain gauge at the deepest part of each depression, and burying a grouting pipe horizontally in each depression along the tunnel axis direction; step 3: during the process of hanging the waterproofing board, pressing the waterproofing board at each depression, stopping when the signal indicator light is on, and performing secondary lining and concrete pouring; step 4: observing the working condition of the signal indicator light corresponding to each depression during the concrete pouring process.

Description

Technical Field

[0001] The invention belongs to the technical field of tunnel engineering, and in particular relates to a detection device and a detection method for preventing the back of a tunnel waterproofing plate from being emptied. Background Art

[0002] During the quality inspection of the secondary lining of the tunnel, voids are often detected behind the lining, which will affect the integrity and stress state of the composite lining. Field verification found that the voids on both sides of the tunnel side walls are basically behind the waterproof board, which is caused by the lack of close contact between the waterproof board and the initial support.

[0003] There are three types of voids in the arch of a tunnel. One is that the cavity appears between the waterproof board and the secondary lining concrete due to incomplete concrete pouring. Another type is caused by the loose fit between the waterproof board and the initial support. The third type is that there are voids among the secondary lining concrete, the waterproof board and the initial support. The voids between the waterproof board and the initial support are mainly caused by poor control of the looseness of the waterproof board. The voids between the lining and the waterproof board mainly exist in the arch and are caused by incomplete concrete pouring. Grouting backfilling is usually used to deal with the voids. However, the waterproof board must be destroyed when grouting backfills the voids between the waterproof board and the initial support, which often causes water leakage in the secondary lining. A detection method is proposed to prevent voids behind the tunnel lining.

[0004] It is very important to maintain the looseness of the waterproof board during the laying process of the tunnel. If the waterproof board is too loose, wrinkles will easily form. If it is too tight, the depression pit of the initial support of the tunnel cannot be filled by the waterproof board. Therefore, the looseness of the tunnel waterproof board will affect the integrity of the composite lining, which requires a detection device that can detect whether the waterproof board can just fill the depression pit of the initial support. The present invention can timely detect the looseness of the tunnel waterproof board, which can save the later detection period and expenses. Summary of the invention

[0005] In view of the existing problems, the present invention provides a detection device for predicting the void behind the tunnel waterproofing board, which can replace the traditional method of mainly destroying the waterproofing board for grouting backfilling, thereby saving construction time and financial resources.

[0006] The technical solution adopted by the present invention is:

[0007] A detection device for preventing the back of a tunnel waterproofing plate from being emptied, wherein the waterproofing plate is arranged between an initial support and a secondary lining, and the detection device comprises a detection feedback body and a signal receiver, wherein the detection feedback body is fixed on the initial support and connected to the signal receiver via a wire, and is used to transmit a signal indicating that the waterproofing plate is in close contact with the initial support, and the signal receiver is installed on a mobile stand.

[0008] Preferably, the detection feedback body is a pressure strain gauge, which is fixed at the deepest part of the depression pit of the primary lining support. After the pressure strain gauge is deformed, the signal is transmitted to the signal receiver through a wire, and the wire is fixed with a self-adhesive wire buckle.

[0009] Preferably, the signal receiver includes a shell, on which a signal indicator light corresponding to the detection feedback body is embedded, a signal conversion module, a signal amplifier and a power supply module are arranged inside the shell, the pressure strain gauge is connected to the input end of the signal converter, the output end of the signal converter is connected to the input end of the signal amplifier, the output end of the signal amplifier is connected to the signal indicator light, and a power switch connected to the internal power supply module is arranged at the upper end of the shell, and the power supply module supplies power to the signal conversion module, the signal amplifier and the signal indicator light.

[0010] Preferably, the mobile platform comprises a base, a sleeve, an inner rod, a fixed platform, a fixed frame and a hydraulic telescopic rod, the sleeve is installed on the base, the lower end of the inner rod is installed inside the sleeve and can move up and down along the sleeve, the upper end of the inner rod is fixedly connected to the bottom of the fixed platform, the fixed frame is fixed to the fixed platform by bolts, the signal receiver is limited on the fixed frame, one end of the hydraulic telescopic rod is connected to the side wall of the sleeve, and the other end of the hydraulic telescopic rod is connected to the side wall of the inner rod, and a universal wheel is provided at the bottom of the base.

[0011] Preferably, the fixing frame includes a "C"-shaped fixing plate, a rear frame, a pad, a fixing block, a guide rod, a connecting rod, a connecting plate, a rack, a gear, a support rod and a traction block. The left and right side walls of the "C"-shaped fixing plate are provided with detour edges distributed along its contour. The rear frame is arranged at the rear end of the "C"-shaped fixing plate, the pad is arranged at the front end of the "C"-shaped fixing plate, the pad is a "U"-shaped structure, the connecting rod is installed on the two side ends of the pad, the front side wall of the "C"-shaped fixing plate is provided with an adapter groove matching the two side ends of the pad, the rear of the adapter groove is provided with a through hole, and two connecting rods are provided, which are respectively installed in the through holes. The rack is provided with a plurality of connecting rods, each of which is provided with a plurality of connecting rods, and the plurality of connecting rods are ...

[0012] The guide rod is installed on the bottom surface of the pad, and the lower end of the guide rod passes through the fixed platform and extends into the fixed cavity of the fixed block. Two fixed blocks are provided and both are installed on the bottom surface of the fixed platform. The guide rod is provided with a first stopper and a second stopper, the first stopper is located in the fixed cavity, and the second stopper is located outside the fixed block. The guide rod is also provided with a compression spring, and the compression spring is located between the first stopper and the inner bottom wall of the fixed cavity.

[0013] Preferably, it also includes a grouting pipe, which is horizontally buried in the sunken pit along the tunnel axis and arranged side by side with the detection feedback body, and the grouting pipe is fixed to the inner wall of the tunnel by an adjustable pipe clamp without drilling.

[0014] Preferably, the punch-free adjustable pipe clamp comprises a mounting plate, an adhesive layer, a right clamping block, a left limit block and an arc-shaped pipe clamp, the adhesive layer is adhered to the lower surface of the mounting plate, the right clamping block and the left limit block are symmetrically arranged on the upper surface of the mounting plate, the upper curved inner surface of the right clamping block is provided with a slide groove, the arc-shaped pipe clamp is installed in the slide groove, teeth are provided on the outer wall of the arc-shaped pipe clamp, and the upper curved inner surface of the left limit block is provided with a tooth groove matching the teeth; the mounting plate is also provided with a fixing block, the fixing block is located on the left side of the left limit block, a cavity is provided inside the fixing block, a movable rod is provided in the cavity, one end of the movable rod is provided with a guide block, the other end of the movable rod extends from an opening provided on the side wall of the fixing block and is connected to the outer straight arm of the left limit block, and a compression spring is provided on the movable rod between the left limit block and the fixing block;

[0015] The inner wall of the cavity is provided with one or two layers of buffer parts distributed along the circumferential direction thereof, and the buffer part is an annular structure formed by a plurality of rubber strips centripetally surrounding the inner wall of the cavity, and the end of the buffer part is in a constricted shape and is in close contact with the wall of the movable rod;

[0016] The upper end surface of the right clamping block is movably connected with a spring connector, the end of the spring connector is provided with a lock buckle, and one end of the arc-shaped pipe clamp is provided with a connecting ring connected with the lock buckle.

[0017] A detection method for preventing the back of a tunnel waterproofing board from being emptied of a detection device, characterized in that the detection method comprises the following steps:

[0018] Step 1: Perform cross-section inspection before installing the waterproof board, mark the locations of the initial shotcrete pits one by one, number them, and install the signal receiver on the fixing frame;

[0019] Step 2: Install the pressure strain gauge at the deepest part of each pit, connect it to the signal receiver through a wire, and bury a grouting pipe horizontally in each pit along the tunnel axis;

[0020] Step 3: During the installation of the waterproof board, press the waterproof board at each depression. When the signal indicator light comes on, stop and pour the concrete for the secondary lining.

[0021] Step 4: During the concrete pouring process, observe the working condition of the signal indicator lights corresponding to each pit.

[0022] Preferably, in the above step 2, the number of the pressure strain gauge is consistent with the number of the initial support pit, and is connected to the interface of the signal indicator light with the same number on the signal receiver.

[0023] Preferably, in the above step 4, when the secondary lining is poured with concrete, the waterproof board at the initial support depression pit will be squeezed and contact the pressure strain gauge in the depression pit, and the corresponding indicator light on the signal receiver will light up; if the signal indicator light is not on, it will still not light up after strengthening the tampering. After the concrete pouring is completed, the grouting backfill will be carried out in time through the pre-buried grouting pipe to make it dense.

[0024] Beneficial effects of the present invention:

[0025] The detection device of the present invention includes a pressure strain gauge and a signal receiver. The circuit in the signal receiver includes a power module, a signal amplifier, a signal conversion module and a signal indicator light. When the secondary lining is poured with concrete, the waterproof board is squeezed to the deepest part of the initial support pit, so that it contacts the pressure strain gauge. At this time, the pressure strain gauge will deform to generate resistance, and the resistance will be converted into an electrical signal through the signal conversion module, thereby generating a weak electrical signal. This weak electrical signal is then amplified by the signal amplification circuit to light up the small light bulb on the signal receiver. By installing a pressure strain gauge in the initial support pit, the degree of close contact between the waterproof board and the initial support can be detected when the secondary lining of the tunnel is poured with concrete, so that the integrity of the composite lining is stronger, the quality is higher, and the safety is more reliable.

[0026] The detection device of the present invention comprises a mobile stand. The signal receiver is mounted on the mobile stand, which is not only convenient for fixing but also for adjusting the height and also for moving the position, thereby improving the installation speed and use flexibility of the signal receiver.

[0027] The detection device of the present invention also includes a punch-free adjustable pipe clamp. Fixing the grouting pipe on the punch-free adjustable pipe clamp is not only simple to operate but also firmly fixed, thereby improving the stability of grouting of the grouting pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 A diagram showing the installation position of a detection device for preventing the back of a tunnel waterproofing board from being emptied in a tunnel cross section according to the present invention;

[0030] Figure 2 It is a diagram of the installation position of a detection device for preventing the back of a tunnel waterproofing board from being emptied in a longitudinal section of a tunnel according to the present invention;

[0031] Figure 3 A simplified diagram of a detection device for preventing the back of a tunnel waterproofing board from being emptied of air according to the present invention;

[0032] Figure 4 A schematic diagram of a self-adhesive wire buckle of a wire laying and fixing device of the present invention;

[0033] Figure 5 A schematic diagram of an adjustable pipe clamp without drilling for a grouting pipe arrangement and fixing device according to the present invention;

[0034] Figure 6 for Figure 5 Sectional view at point A;

[0035] Figure 7 The structural diagram of the signal receiver installed on the mobile stand;

[0036] Figure 8 This is the structural diagram of the mobile stand;

[0037] Fig. 9 for Figure 8 Sectional view at B in the middle;

[0038] Fig.10 is a side view of the fixing frame;

[0039] Fig.11 is a side sectional view of the fixing frame;

[0040] Fig.12 is a front view of the fixing frame;

[0041] Fig.13 is a rear side cross-sectional view of the fixing frame;

[0042] Fig.14 is a top view of the fixing frame;

[0043] Fig.15 It is a combined view of the pad, connecting rod and connecting plate;

[0044] Fig.16 A construction flow chart of a detection method for preventing the back of a tunnel waterproofing board from being emptied of air;

[0045] Component number description

[0046] 1- initial support; 2- waterproof board; 3- secondary lining; 4- pressure strain gauge; 5- conductor; 6- signal receiver; 7- signal indicator light; 8- power switch; 9- sunken pit; 10- grouting pipe; 11- self-adhesive wire buckle; 12- punch-free adjustable pipe clamp; 1201- mounting plate; 1202- adhesive layer; 1203- right clamp block; 1204- arc pipe clamp; 1205- left limit block; 1206- fixed block; 13- tooth groove; 14- tooth; 15- connecting ring; 16- spring connector; 17- movable rod; 18- compression spring; 19- cavity; 20- buffer; 21- "C "-shaped fixing plate; 2101-adapting groove; 2102-perforation; 2103-limiting cavity; 2104-guide groove; 2105-circumventing edge; 22-fixing platform; 23-inner rod; 24-sleeve; 25-hydraulic telescopic rod; 26-fixing block; 2601-fixing cavity; 27-guide rod; 28-pad; 29-rear frame; 30-connecting rod; 31-support rod; 32-rack; 33-gear; 34-traction block; 35-support rod; 36-rubber pad; 37-connecting plate; 38-first block; 39-second block; 40-compression spring; 42-suction cup; 43-base; 44-universal wheel. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0048] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] During the quality inspection of the secondary lining of a tunnel, voids are often detected behind the lining. Field verification has found that the voids on both sides of the tunnel side walls are basically behind the waterproof board, which is caused by the lack of close contact between the waterproof board and the initial support. There are three types of voids in the tunnel arch. One is that the concrete is not fully poured, resulting in a cavity between the waterproof board and the secondary lining concrete. One is caused by the lack of close contact between the waterproof board and the initial support. The third type is that there are voids between the secondary lining concrete, the waterproof board, and the initial support. The voids between the waterproof board and the initial support are mainly caused by poor control of the looseness of the waterproof board. The voids between the lining and the waterproof board mainly exist in the arch, which is caused by incomplete concrete pouring. Grouting backfilling is usually used to deal with the voids. However, the waterproof board must be destroyed when grouting backfills the voids between the waterproof board and the initial support, which often causes water leakage in the secondary lining. In order to prevent the voids behind the tunnel lining, a detection device and a detection method for preventing voids behind the tunnel waterproof board are proposed.

[0050] like Figures 1 to 3 As shown, the present invention provides a detection device for preventing the back of a tunnel waterproofing board from being emptied, the detection device comprises a detection feedback body and a signal receiver 6, and the detection feedback body is connected to the signal receiver 6 via a wire 5. Figure 4 As shown, the wire 5 is fixed by a self-adhesive wire buckle 11. Figure 7 As shown, the signal receiver is installed on a mobile stand.

[0051] Specifically, the detection feedback body is a pressure strain gauge 4 and there are several of them. Each pressure strain gauge 4 is fixed at the deepest part of the corresponding depression pit 9 on the primary lining support 1, and is used to transmit a signal to the signal receiver 6 whether the waterproof board 2 is in close contact with the initial support 1 when the secondary lining 3 is poured with concrete.

[0052] The pressure strain gauge 4 is fixed by strong glue. First, the deepest part of the depression 9 of the primary lining support 1 is polished and cleaned, and then strong glue is applied on the back of the pressure strain gauge 4 and pasted on the treated area.

[0053] During the construction process, the signal receiver is generally placed on the ground, but it seriously affects the construction and poses a safety hazard. Based on this, the present invention designs a mobile stand, and the signal receiver is installed on the mobile stand. The operation is simple, and the safety of the use of the signal receiver is improved, which is convenient for later operation. The signal receiver 6 includes a shell, and a signal indicator light 7 corresponding to the detection feedback body is embedded in the shell. A signal conversion module, a signal amplifier and a power module are arranged inside the shell. The pressure strain gauge 4 is connected to the input end of the signal converter, and the output end of the signal converter is connected to the input end of the signal amplifier. The output end of the signal amplifier is connected to the signal indicator light 7. A power switch 8 connected to the internal power module is arranged on the upper end of the shell, and the power module supplies power to the signal conversion module, the signal amplifier and the signal indicator light.

[0054] like Figure 7 As shown, the mobile platform includes a base 43, a sleeve 24, an inner rod 23, a fixed platform 22, a fixed frame and a hydraulic telescopic rod 25. The sleeve 24 is installed on the base 43. The lower end of the inner rod 23 is installed inside the sleeve 24 and can move up and down along the sleeve 24. The upper end is fixedly connected to the bottom of the fixed platform 22. The fixed frame is fixed to the fixed platform 22 by bolts. The signal receiver 6 is limited on the fixed frame. One end of the hydraulic telescopic rod 25 is connected to the side wall of the sleeve 24, and the other end is connected to the side wall of the inner rod 23. The bottom of the base 43 is provided with a universal wheel 44. It is convenient to move the signal receiver 6 and adjust the height of the signal receiver 6. Thereby improving the flexibility of adjusting the signal receiver 6.

[0055] like Figure 8-15As shown, the fixing frame includes a "C"-shaped fixing plate 21, a rear frame 29, a pad 28, a fixing block 26, a guide rod 27, a connecting rod 30, a connecting plate 37, a rack 32, a gear 33, a support rod 31 and a traction block 34. The rear frame 29 is arranged at the rear end of the "C"-shaped fixing plate 21, and the pad 28 is arranged at the front end of the "C"-shaped fixing plate 21. The pad 28 is a "U"-shaped structure. The connecting rod 30 is installed on both side ends of the pad 28. The front side wall of the "C"-shaped fixing plate 21 is provided with an adapter groove 2101 that matches the two side ends of the pad 28. The rear of the adapter groove 2101 is provided with a through hole 2102. The connecting rod 30 is provided with two, which are respectively installed in the through hole 2102 and penetrate through The two connecting rods 30 are connected through a connecting plate 37. One end of the rack 32 is arranged on the connecting plate 37 and meshes with the gear 33 above. The gear 33 is arranged on the support rod 31. A bearing is also arranged between the inner wall of the gear 33 and the support rod 31. The two ends of the support rod 31 are respectively mounted on the side walls of the rear frame 29. The other end of the rack 32 passes through the rear side wall of the "C"-shaped fixing plate 21 to the limiting cavity 2103 inside it, and its end is connected to the traction block 34. The front and rear sides of the limiting cavity 2103 are respectively provided with guide grooves 2104. The guide grooves 2104 are provided with support rods 35. One end of the support rod 35 is connected to the traction block 34. Rubber pads 36 are arranged on both sides of the support rod 35. The rubber pads 36 are trapezoidal in structure and are installed along the two side walls of the guide grooves 2104.

[0056] The guide rod 27 is installed on the bottom surface of the pad 38, and the lower end of the guide rod 27 passes through the fixed platform 22 and extends into the fixed cavity 2601 of the fixed block 26. The fixed block 26 is provided with two and both are installed on the bottom surface of the fixed platform 22. The guide rod 27 is provided with a first stopper 37 and a second stopper 39. The first stopper 38 is located in the fixed cavity 2601, and the second stopper 39 is located outside the fixed block 26. The guide rod 27 is also provided with a compression spring 40, and the compression spring 40 is located between the first stopper 28 and the inner bottom wall of the fixed cavity 2601.

[0057] In this embodiment, the left and right side walls of the “C”-shaped fixing plate 21 are provided with detour edges 2105 distributed along the contour thereof, which are used to limit the left and right positions of the signal receiver 6 , thereby improving the stability of the signal receiver 6 .

[0058] In this embodiment, a plurality of suction cups 42 are provided on the front side wall of the “C”-shaped fixing plate 21 . The suction cups 42 are located between the two adapting grooves 2101 and are used to limit the signal receiver 6 .

[0059] During the installation of the signal receiver 6, the pad 28 is first pressed downward, and the guide rod 27 moves downward along the fixed cavity 2601 and compresses the compression spring 40. At the same time, under the action of the pad 28, the connecting rod 30 is driven to move downward, and the rack 32 above the connecting rod 30 rotates around the gear 33. The traction block 34 at the other end of the traction rack 32 moves along the limit cavity 2103, and the support rods on both sides of the traction block 34 move in the guide groove 2104. The rubber pad 36 in the guide groove 2104 squeezes the support rod, and as the support rod 35 moves upward, its squeezing force is greater. The height of the pad 28 is limited by the compression spring 4. and the rubber pad 36, so as to ensure that the signal receiver 6 is limited, and at the same time, the damage caused by the persistent squeezing of the signal receiver 6 by the pad 28 under the compression spring 40 can be avoided.

[0060] In the above process, the pressure strain gauge 4, the power module, the signal conversion module, the signal receiver and the signal indicator light 7 form a normally open circuit, at which time the signal indicator light is off. When the pressure strain gauge 4 is deformed, a closed circuit will be formed, and the signal indicator light 7 will light up.

[0061] like Figure 2 As shown, a grouting pipe 10 is buried horizontally in the concave pit 9 on each initial support 1 along the tunnel axis and arranged side by side with the detection feedback body; the grouting pipe 10 is fixed at a designated position by a punch-free adjustable pipe clamp 12. Figure 5 and 6 shown.

[0062] The above-mentioned punch-free adjustable pipe clamp 12 comprises a mounting plate 1201, an adhesive layer 1202, a right clamping block 1203, a left limit block 1205 and an arc-shaped pipe clamp 1204, wherein the adhesive layer 1202 is adhered to the lower surface of the mounting plate 1201, the right clamping block 1203 and the left limit block 1205 are symmetrically arranged on the upper surface of the mounting plate 1201, the upper curved inner surface of the right clamping block 1203 is provided with a slide groove, the arc-shaped pipe clamp 1204 is installed in the slide groove, the outer wall of the arc-shaped pipe clamp 1204 is provided with teeth 14, and the upper curved inner surface of the left limit block 1205 is provided with a There is a tooth groove 13 that matches the tooth 14; a fixed block 1206 is also provided on the mounting plate 1201, and the fixed block 1206 is located on the left side of the left limit block 1205. A cavity 19 is provided inside the fixed block 1206, and a movable rod 17 is provided in the cavity 19. A guide block (not shown in the figure) is provided at one end of the movable rod 17, and the other end thereof extends from an opening provided on the side wall of the fixed block 1206 and is connected to the outer straight arm of the left limit block 1205. A compression spring 18 is provided on the movable rod 17 between the left limit block 1205 and the fixed block 1206.

[0063] The upper end surface of the right clamping block 1203 is movably connected with a spring connector 16, a lock buckle is provided at the end of the spring connector 16, and a connecting ring 15 connected with the lock buckle is provided on one end of the arc-shaped pipe clamp 1204.

[0064] In this embodiment, the arc-shaped pipe clamp 1204 can slide relatively along the slide groove. When the grouting pipe 10 is clamped inside the arc-shaped pipe clamp 1204, the end of the arc-shaped pipe clamp 1204 can be manually pulled to connect the lock buckle on the spring connector 16 with the connecting ring 15; then, after pushing the left limit block 1205, the tooth groove 13 on the curved inner surface thereof matches with the tooth teeth 14 on the outer wall of the arc-shaped pipe clamp 1204, thereby realizing the relative fixation of the arc-shaped pipe clamp 1204 and limiting the grouting pipe 10 inside the arc-shaped pipe clamp 1204. The overall structure is easy to use and has high stability.

[0065] Secondly, one or two layers of buffer parts 20 are arranged on the inner wall of the cavity 19 along its circumferential direction. The buffer part 20 is an annular structure formed by a plurality of rubber strips surrounding the center. The end of the buffer part 20 is in a constricted shape and is close to the wall of the movable rod 17.

[0066] In addition, the grouting pipe in this embodiment can also be used as an exhaust pipe.

[0067] In addition, the present invention also provides a detection method for preventing the back of the tunnel waterproofing board from being emptied. Fig.16 As shown, the detection method comprises the following steps:

[0068] Step 1: Perform cross-section inspection before hanging the waterproof board 2, mark the positions of the initial shotcrete pits 9 one by one, number them, and install the signal receiver 6 on the fixing frame;

[0069] Step 2: Install the pressure strain gauge 4 at the deepest part of each depression 9, connect it to the signal receiver 6 through the wire 5, and bury the grouting pipe 10 horizontally in each depression 9 along the tunnel axis direction;

[0070] Step 3: During the installation of the waterproof board 2, the waterproof board 2 is pressed at each depression 9, and the process stops when the signal indicator light 7 is on, and the secondary lining 3 is poured with concrete;

[0071] Step 4: During the process of pouring concrete, observe the working condition of the signal indicator light 7 corresponding to each depression 9.

[0072] In the above step 2, the number of the pressure strain gauge 4 is consistent with the number of the depression pit 9 of the initial support 1, and is connected to the interface of the signal indicator light with the same number on the signal receiver 6.

[0073] In the above step 3, during the process of hanging the waterproof board 2, the waterproof board is manually pressed at each depression 9 until the strain gauge indicator light 7 lights up. On the one hand, the working effect of the strain gauge is detected, and on the other hand, the looseness of the waterproof board is determined to prevent the waterproof board from being too tight or too loose, causing the waterproof board to not be effectively attached to the sprayed concrete surface.

[0074] In the above step 4, pay attention to observe the working condition of the indicator light of each depression pit 9 during the concrete pouring process. If each light is on, it means that the waterproof board 2 is well attached to the initial support. If the light is not on when the concrete is poured into a depression pit, it is necessary to strengthen the tamping or find out the reason. If it is still not on after taking measures, after the concrete pouring is completed, grouting backfilling should be carried out in time through the pre-buried grouting pipe to make it dense.

[0075] The present invention solves the problem of predicting the void behind the tunnel waterproofing board, and can replace the traditional method of destroying the waterproofing board for grouting backfilling. It has a simple structure, low cost, simple operation, and is easy to master. It can predict the void behind the tunnel waterproofing board in advance, avoiding the need for grouting due to void behind the tunnel waterproofing board in the later stage, while reducing the construction cost and ensuring the construction period; the structural design is reasonable, the conception is ingenious and novel, breaking the traditional method, greatly enriching the tunnel construction detection equipment, and has extremely wide promotion value.

[0076] The above description is only used to illustrate the technical solution of the present invention rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in this field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. A detection device for preventing the back of a tunnel waterproofing board from being emptied, wherein the waterproofing board is arranged between the initial support and the secondary lining, and is characterized in that: The detection device includes a detection feedback body and a signal receiver. The detection feedback body is fixed on the initial support and connected to the signal receiver through a wire to transmit a signal that the waterproof board is in close contact with the initial support. The signal receiver is installed on a mobile stand. The detection feedback body is a pressure strain gauge, which is fixed at the deepest part of the initial support pit. After the pressure strain gauge is deformed, the signal is transmitted to the signal receiver through a wire. The signal receiver includes a shell, and a signal indicator light corresponding to the detection feedback body is embedded in the shell. A signal conversion module, a signal amplifier and a power supply module are arranged inside the shell. The pressure strain gauge is connected to the input end of the signal converter, the output end of the signal converter is connected to the input end of the signal amplifier, and the output end of the signal amplifier is connected to the signal indicator light. A power switch connected to the internal power supply module is arranged at the upper end of the shell, and the power supply module supplies power to the signal conversion module, the signal amplifier and the signal indicator light. The mobile platform comprises a base, a sleeve, an inner rod, a fixed platform, a fixed frame and a hydraulic telescopic rod, wherein the sleeve is mounted on the base, the lower end of the inner rod is mounted inside the sleeve and can move up and down along the sleeve, and the upper end thereof is fixedly connected to the bottom of the fixed platform, the fixed frame is fixed to the fixed platform by bolts, the signal receiver is limited on the fixed frame, one end of the hydraulic telescopic rod is connected to the side wall of the sleeve, and the other end thereof is connected to the side wall of the inner rod, and a universal wheel is arranged at the bottom of the base; The fixing frame includes a "C"-shaped fixing plate, a rear frame, a pad, a fixing block, a guide rod, a connecting rod, a connecting plate, a rack, a gear, a support rod and a traction block. The left and right side walls of the "C"-shaped fixing plate are provided with detour edges distributed along its contour. The rear frame is arranged at the rear end of the "C"-shaped fixing plate, and the pad is arranged at the front end of the "C"-shaped fixing plate. The pad is a "U"-shaped structure. The connecting rod is installed on the two side ends of the pad. The front side wall of the "C"-shaped fixing plate is provided with an adapter groove that matches the two side ends of the pad. A through hole is arranged at the rear of the adapter groove. Two connecting rods are provided, which are respectively installed in the through holes and The rack extends through the rear side wall of the "C"-shaped fixing plate, the two connecting rods are connected through a connecting plate, one end of the rack is arranged on the connecting plate and meshes with the gear above, the gear is arranged on the support rod, the two ends of the support rod are respectively mounted on the side walls of the rear frame, the other end of the rack extends from the rear side wall of the "C"-shaped fixing plate to the limiting cavity inside the plate, and the end thereof is connected to the traction block, the front and rear sides of the limiting cavity are respectively provided with guide grooves, the guide grooves are provided with rubber pads and support rods, the rubber pads are in a trapezoidal structure and are mounted along the two side walls of the guide grooves, the support rods are located in the rubber pads, and one end of the support rods is connected to the traction block; The guide rod is installed on the bottom surface of the pad, the lower end of the guide rod passes through the fixed platform and extends into the fixed cavity of the fixed block, two fixed blocks are provided and both are installed on the bottom surface of the fixed platform, the guide rod is provided with a first stopper and a second stopper, the second stopper is located in the fixed cavity, the first stopper is located outside the fixed block, and the guide rod is also provided with a compression spring, and the compression spring is located between the second stopper and the inner bottom wall of the fixed cavity; The installation process of the signal receiver includes: first, the pad is pressed downward, the guide rod moves downward along the fixed cavity and compresses the compression spring, and at the same time, under the action of the pad, the connecting rod is driven to move downward, the rack above the connecting rod rotates around the gear, and the traction block at the other end of the traction rack moves along the limit cavity, and the support rods on both sides of the traction block move in the guide groove, and the rubber pad in the guide groove squeezes the support rod, and as the support rod moves upward, its squeezing force is greater, and the height of the pad is limited by the compression spring and the rubber pad; It also includes a grouting pipe, which is horizontally buried in the sunken pit along the tunnel axis and arranged side by side with the detection feedback body, and the grouting pipe is fixed to the inner wall of the tunnel by an adjustable pipe clamp without drilling; The punch-free adjustable pipe clamp comprises a mounting plate, an adhesive layer, a right clamping block, a left limit block and an arc-shaped pipe clamp, the adhesive layer is adhered to the lower surface of the mounting plate, the right clamping block and the left limit block are symmetrically arranged on the upper surface of the mounting plate, the upper curved inner surface of the right clamping block is provided with a slide groove, the arc-shaped pipe clamp is installed in the slide groove, teeth are provided on the outer wall of the arc-shaped pipe clamp, and the upper curved inner surface of the left limit block is provided with a tooth groove matching the teeth; a fixing block is also provided on the mounting plate, the fixing block is located on the left side of the left limit block, a cavity is provided inside the fixing block, a movable rod is provided in the cavity, one end of the movable rod is provided with a guide block, the other end of the guide block extends from an opening provided on the side wall of the fixing block and is connected to the outer side wall of the left limit block, and a compression spring is provided on the movable rod between the left limit block and the fixing block; The inner wall of the cavity is provided with one or two layers of buffer parts distributed along the circumferential direction thereof, and the buffer part is an annular structure formed by a plurality of rubber strips surrounding the center, and the end thereof is in a constricted shape and is closely attached to the wall of the movable rod; The upper end surface of the right clamping block is movably connected with a spring connector, the end of the spring connector is provided with a lock buckle, and one end of the arc-shaped pipe clamp is provided with a connecting ring connected with the lock buckle.

2. A detection device for preventing the back of a tunnel waterproofing board from being emptied according to claim 1, characterized in that: The wire is fixed by a self-adhesive wire buckle.

3. A detection method for preventing the back of a tunnel waterproofing board from being emptied, using a detection device for preventing the back of a tunnel waterproofing board from being emptied according to any one of claims 1 to 2, characterized in that: The detection method comprises the following steps: Step 1: Perform cross-section inspection before installing the waterproof board, mark the locations of the initial support shotcrete pits one by one, number them, and install the signal receiver on the fixed frame; Step 2: Install the pressure strain gauge at the deepest part of each pit, connect it to the signal receiver through a wire, and bury a grouting pipe horizontally in each pit along the tunnel axis; Step 3: During the installation of the waterproof board, press the waterproof board at each depression. When the signal indicator light comes on, stop and pour the secondary lining concrete. Step 4: During the concrete pouring process, observe the working condition of the signal indicator lights corresponding to each pit.

4. A detection method for preventing the back of a tunnel waterproofing board from being emptied according to claim 3, characterized in that: In the above step 2, the number of the pressure strain gauge is consistent with the number of the initial support pit, and is connected to the interface of the signal indicator light with the same number on the signal receiver.

5. A detection method for preventing the back of a tunnel waterproofing board from being emptied according to claim 3, characterized in that: In the above step 4, when the secondary lining is poured with concrete, the waterproof board at the initial support depression pit will be squeezed and contact the pressure strain gauge in the depression pit, and the corresponding indicator light on the signal receiver will light up; if the signal indicator light is not on and still does not light up after strengthening, after the concrete pouring is completed, grouting backfilling is carried out in time through the pre-buried grouting pipe to make it dense.

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