Tunnel secondary lining concrete pouring method

Abstract

The invention provides a tunnel secondary lining concrete pouring method. The method is completed through a tunnel secondary lining concrete pouring mold. The method specifically comprises the following steps: A, pouring a first section of a tunnel secondary lining; b, the end, away from the connecting bases, of the bottom formwork of the moving trolley is in lap joint with the poured tunnel second lining segment, and two connecting shafts are connected to the connecting bases located at the two ends of the circumferential direction of the bottom formwork; c, forming a local cavity of the tunnel secondary lining; d, pouring; e, displacement of the end template sheet; c to D are repeated, and a second tunnel secondary lining section part in the same tunnel secondary lining section is poured; c to E are repeated, and pouring of the second lining connection section of the tunnel is completed; and the steps from B to E are repeated, and pouring of all the tunnel second lining connection sections is completed. The end formwork has the advantage that the end formwork does not need to be built for the second time, and the problem that an existing pouring tunnel secondary lining end formwork needs to be built on site every time, and time is wasted is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tunnel construction, and particularly relates to a tunnel secondary lining concrete pouring method. BACKGROUND

[0002] In tunnel engineering construction, the secondary lining is a reinforced concrete structure, and concrete pouring is an important construction link. Therefore, a formwork trolley needs to be erected and arranged, and a bottom formwork is built on the formwork trolley. The bottom formwork is used for forming an inner circumferential surface of the tunnel secondary lining. An arc-shaped waterproof plate is laid on the inner circumferential surface of the tunnel bottom lining. One end of the bottom formwork is connected to the secondary lining that has been poured to achieve plugging, and the other end needs to be plugged by using an end formwork to close the concrete pouring space. At present, the end formwork is mostly manually spliced on site by using wooden strips, plastic strips and other materials. The installation and disassembly process of the end formwork is complicated, and a large amount of time and manpower is consumed, which reduces the construction efficiency. The current steel end formwork is a fixed structure, and there are gaps of different sizes between the edges of the end formwork and the waterproof plates on the surface of the tunnel bottom lining, and there are also gaps between the end formwork and the water stop belts in the local inner part of the tunnel secondary lining, which causes the phenomenon of concrete leakage during concrete pouring. SUMMARY

[0003] The first object of the present application aims to provide a tunnel secondary lining concrete pouring method without the need for secondary construction of a parting, which solves the problem of time-consuming on-site construction of the existing tunnel secondary lining end formwork each time.

[0004] The second object of the present application aims to further provide a tunnel secondary lining concrete pouring method that will not leak concrete during pouring, which solves the problem of concrete leakage of the existing tunnel secondary lining end formwork.

[0005] To achieve the above objectives, the present invention employs the following technology: a method for pouring concrete for tunnel secondary lining, characterized in that it is accomplished using a tunnel secondary lining concrete pouring mold. The tunnel secondary lining concrete pouring mold includes a template trolley, a waterstop, end template pieces, a bottom template set on the template trolley, and a connecting seat set at one end of the bottom template. The bottom template is used to form the inner circumferential surface of the tunnel secondary lining. An arc-shaped waterproof membrane is laid on the inner circumferential surface of the tunnel bottom lining. The end template pieces include an inner end plate, a middle end plate, an outer end plate, and two sets of crossbar assemblies distributed circumferentially along the bottom template. The inner end plate, middle end plate, and outer end plate are radially distributed along the bottom template. The inner end plate is provided with an inner end plate connecting ear. The system includes: an inner end plate with a connecting hole, which has a threaded hole penetrating the surface of the inner end plate connecting lug, and an inner end plate locking bolt internally threaded into the threaded hole; a middle end plate with a connecting lug, which has a connecting hole, and a threaded hole penetrating the surface of the connecting lug, and a threaded hole threaded into the threaded hole ... Plate locking bolts; the crossbar assembly includes a connecting shaft and two sets of end plate connecting ears distributed along the extension direction of the connecting shaft. The end plate connecting ears are fixed on the connecting seat. Each set of end plate connecting ears includes two end plate connecting ears distributed perpendicular to the connecting shaft direction. The end plate connecting ears are provided with connecting ear through holes. The rotating shaft passes through both the connecting shaft and the two connecting ear through holes of one set of end plate connecting ears. The anti-rotation screw passes through both the connecting shaft and the two connecting ear through holes of the other set of end plate connecting ears and is then connected together with the anti-loosening nut. The connecting shaft passes through the inner end plate connecting hole, the middle end plate connecting hole, and the outer end plate connecting hole. The locking bolts of the end plate, the middle end plate, and the outer end plate all abut against the connecting shaft. The inner end plate and the middle end plate clamp the waterstop, and the outer end plate abuts against the waterproof plate. The process of pouring the tunnel secondary lining is as follows: A. Pouring preparation: After pouring the first section of the tunnel secondary lining, connect multiple connecting seats with end plate connecting ears distributed along the circumference of the bottom formwork to the end face of the bottom formwork; B. Trolley positioning: Move the trolley to the end of the bottom formwork away from the connecting seat and overlap it on the poured tunnel secondary lining section, so that the two connecting shafts are connected to the connecting seats located at both ends of the bottom formwork circumferentially.C. Forming the local cavity of the second lining of the tunnel: rotating the connecting shaft to the inner end plate to lap on the end face of the bottom mold plate or the connecting seat, making the outer end plate and the waterproof plate seal and abut together, tightening the anti-loose nut after wearing the anti-rotation screw, so as to prevent the connecting shaft from rotating, the end mold plate, the bottom mold plate, the tunnel bottom lining and the poured second lining of the tunnel form the local cavity of the second lining of the tunnel; D. Pouring: pouring concrete in the local cavity of the second lining of the tunnel to form a local part of the second lining of the tunnel; E. Moving the end mold plate: removing the connecting shaft and connecting it to the connecting seat adjacent to the poured local part of the second lining of the tunnel, repeating C to D to pour the second local part of the second lining of the tunnel in the same tunnel; repeating C to E to complete the pouring of a second lining section of the tunnel; repeating B to E to complete the pouring of all second lining sections of the tunnel.

[0006] As a preferred, the inner end plate and the outer end plate lap together. It can adapt to the change of radial size.

[0007] As a preferred, the inner end plate is provided with a storage through hole distributed in the up-down direction, and the storage through hole is provided with a transparent isolation plate at one end of the connecting shaft, and the isolation plate separates a storage hole in the storage through hole. When pouring, the pouring height of the concrete is observed through the isolation plate.

[0008] As a preferred, the storage through hole is provided with a small diameter section at one end of the connecting shaft to form a support step, and the isolation plate is supported on the support step. The isolation plate can be removed and installed in the storage hole. The side of the isolation plate away from the small diameter section can be covered with a transparent protective film. After pouring, the concrete flowing into the storage hole is removed by pushing the isolation plate away from the support step, then the protective film is peeled off and a new protective film is covered, and the isolation plate is reinstalled in the storage through hole. The isolation plate can still be clearly observed when reused.

[0009] As a preferred, the storage hole stores phenolphthalein powder. When the pouring height reaches the storage hole, the concrete will turn red when it contacts the phenolphthalein powder. It can more conveniently and reliably observe the concrete.

[0010] As a preferred, the bottom mold plate is provided with a connecting seat at one end, and the connecting seat is provided with a guide slot distributed in the circumferential direction of the bottom mold plate, and the two ends of the guide slot are provided with a barb slot, the connecting seat includes a connecting plate outside the guide slot and a clamping strip penetrating into the two barb slots at both ends, the clamping strip is threadedly connected with a clamping screw, the clamping screw penetrates into the connecting plate, the head of the clamping bolt drives the connecting plate to cooperate with the clamping strip to clamp the slot wall of the barb slot, and the end plate part connecting ear is connected to the connecting plate. After pouring in one position, loosen the clamping screw, then move the connecting seat to the desired position along the guide slot, and then lock the clamping screw to fix the connecting seat. Only one connecting seat is needed to complete the pouring of the entire second lining of the tunnel.

[0011] As preferred, the clamping strip is provided with a supporting ball for supporting on the bottom wall of the guide groove. The moving of the connecting seat is labor-saving.

[0012] As preferred, the outer end plate is provided with a self-adaptive sealing structure for sealing the outer end plate and the waterproof plate together, the self-adaptive sealing structure comprises an arc-shaped elastic sealing strip, an elastic connecting sleeve for sealing and connecting the elastic sealing strip and the outer end plate together, and a plurality of cylinder bodies arranged in the outer end plate, a piston is sealingly connected in the cylinder body and slides in the cylinder body, the piston is connected with the elastic sealing strip through a piston rod, the piston rod passes through the elastic connecting sleeve, the elastic sealing strip is pressed on the waterproof plate through the piston rod, the diameter of the circle where the elastic sealing strip is located is greater than the diameter of the circle where the waterproof plate is located, the piston separates the cylinder body into a rod cavity and a rodless cavity, and all the piston rods are distributed along the circumference of the waterproof plate. The outer end plate can be reliably sealed together with the waterproof plate when the curvature of the inner circumferential surface of the tunnel bottom lining is different. The second object is achieved.

[0013] As preferred, the side surface of the elastic sealing strip in contact with the waterproof plate is provided with an elastic sealing layer, the rod cavity of all the cylinder bodies is in communication with a first fluid inlet and outlet, and the rodless cavity is in communication with a second fluid inlet and outlet. The sealing reliability can be improved. When sealing, the fluid in the rod cavity flows out through the first fluid inlet and outlet by inputting the fluid with pressure through the second fluid inlet. When unsealing and removing the outer end plate, the fluid in the rod cavity flows out through the second fluid inlet and outlet by inputting the fluid with pressure through the first fluid inlet.

[0014] As preferred, all the cylinder bodies are distributed along the radial direction of the bottom mold plate, one end of the rod cavity is provided with an avoidance channel for the piston rod to pass through, and the piston rod is sealingly connected with the end wall away from the piston end of the avoidance channel. In a limited space, the piston area in each cylinder is large, so that each cylinder can bear a large force.

[0015] Beneficial effects: when used twice, the end mold plate does not need to be newly built, which saves time and labor; the sealing effect is good, the mortar is not easy to leak, and the concrete pouring position can be conveniently mixed. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The process flowchart of the application;

[0017] Figure 2 The three-dimensional structure schematic diagram of the tunnel secondary lining concrete pouring mold in the embodiment one of the application;

[0018] Figure 3 For Figure 2 the local enlarged schematic diagram;

[0019] Figure 4is a schematic view of the cross section of the inner end plate;

[0020] Figure 5 is a schematic view of the side of the tunnel lining concrete pouring mold in embodiment two of the present application;

[0021] Figure 6 is a schematic view of the cross section of the inner end plate; Figure 5

[0022] Figure 7 is a schematic view of the cross section of the inner end plate; Figure 6

[0023] Figure 8 is a schematic view of the cross section of the inner end plate; Figure 6

[0024] In the figure: base mold plate 1, waterproof plate 2, water stop 3, end mold plate 4, connecting seat 5, inner end plate 6, middle end plate 7, outer end plate 8, inner end plate connecting lug 10, inner end plate locking bolt 11, middle end plate locking bolt 13, outer end plate connecting lug 14, outer end plate locking bolt 15, connecting shaft 16, end plate connecting lug 17, rotating shaft 18, rotation stopping screw 19, anti-loosening nut 20, storage through hole 21, isolation plate 22, storage hole 23, support step 24, protective film 25, guide groove 26, barb groove 27, connecting plate 28, clamping strip 29, clamping screw 30, support rolling ball 31, self-adapting sealing structure 32, elastic sealing strip 33, elastic connecting sleeve 34, cylinder 35, piston 36, piston rod 37, rod cavity 38, rodless cavity 39, elastic sealing layer 40, first fluid inlet and outlet 41, second fluid inlet and outlet 42, avoidance channel 43. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0026] Embodiment one, see Figures 1 to 4 ​​​The utility model provides a kind of tunnel secondary lining concrete pouring method, is completed by tunnel secondary lining concrete pouring mould.The tunnel secondary lining concrete pouring includes formwork trolley and the bottom formwork 1 being arranged on formwork trolley, and the bottom formwork is used to form the inner circumferential surface of tunnel secondary lining.Arc-shaped waterproof board 2 (only part is shown in the drawing) is laid on the inner circumferential surface of tunnel bottom lining.It also includes waterstop 3 (also only part is shown in the drawing), end formwork piece 4 and connecting seat 5 being arranged in the bottom formwork one end.The connecting seat can be set multiple or one movable on the end surface of bottom formwork.The end formwork piece includes inner end plate 6, middle end plate 7, outer end plate 8 and two groups of crossbar assembly distributed along the circumference of bottom formwork.The inner end plate, middle end plate and outer end plate are distributed along the radial direction of bottom formwork;The inner end plate is provided with inner end plate part connecting lug 10, and the inner end plate part connecting lug is provided with inner end plate part connecting hole, and the inner end plate part connecting hole is provided with inner end plate part screw hole penetrating the surface of inner end plate part connecting lug, and the inner end plate part screw hole is screwed with inner end plate part locking bolt 11;The middle end plate is provided with middle end plate part connecting lug 12, and the middle end plate part connecting lug is provided with middle end plate part connecting hole, and the middle end plate part connecting hole is provided with middle end plate part screw hole penetrating the surface of middle end plate part connecting lug, and the middle end plate part screw hole is screwed with middle end plate part locking bolt 13;The outer end plate is provided with outer end plate part connecting lug 14, and the outer end plate part connecting lug is provided with outer end plate part connecting hole, and the outer end plate part connecting hole is provided with outer end plate part screw hole penetrating the surface of outer end plate part connecting lug, and the outer end plate part screw hole is screwed with outer end plate part locking bolt 15;The crossbar assembly includes connecting shaft 16 and two groups of end head plate part connecting lug 17 distributed along the extension direction of connecting shaft, and the end head plate part connecting lug is fixed on connecting seat, and the same group of end head plate part connecting lug includes two end head plate part connecting lugs distributed perpendicularly to the direction of connecting shaft, and the end head plate part connecting lug is provided with connecting lug part through hole, and the rotating shaft 18 is simultaneously arranged in the two connecting lug part through holes of connecting shaft and a group of end head plate part connecting lug, and the stop screw 19 is simultaneously arranged in the two connecting lug part through holes of connecting shaft and another group of end head plate part connecting lug after being arranged, and then the same stop nut 20 is connected together, the connecting shaft is simultaneously arranged in the inner end plate part connecting hole, the middle end plate part connecting hole and the outer end plate part connecting hole, and the inner end plate part locking bolt, the middle end plate part locking bolt and the outer end plate part locking bolt all abut on the connecting shaft, and the inner end plate and the middle end plate clamp the waterstop, and the outer end plate abuts on the waterproof board.The process for pouring the second lining of the tunnel comprises the following steps: A, connecting a plurality of connecting seats with end plate connecting ears distributed along the circumference of the bottom formwork on the end face of the bottom formwork after pouring the first section of the second lining of the tunnel; B, moving the trolley to the end of the bottom formwork away from the connecting seat and overlapping the trolley on the poured section of the second lining of the tunnel, so that the two connecting shafts are connected to the connecting seats located at the circumferential ends of the bottom formwork; C, forming a local cavity of the second lining of the tunnel: rotating the connecting shaft around the rotating shaft to overlap the inner end plate on the end face of the bottom formwork or the connecting seat, so that the outer end plate and the waterproof plate are sealed and abutted together, the anti-rotation screw is tightened, and the anti-removal nut is locked, so as to prevent the connecting shaft from rotating, and the end formwork plate, the bottom formwork, the tunnel bottom lining and the poured section of the second lining of the tunnel form a local cavity of the second lining of the tunnel; D, pouring concrete in the local cavity of the second lining of the tunnel to form a local section of the second lining of the tunnel; E, removing the connecting shaft and connecting it to the connecting seat adjacent to the poured local section of the second lining of the tunnel, repeating steps C to D to pour a second local section of the second lining of the tunnel in the same section of the second lining of the tunnel; repeating steps C to E to complete the pouring of one section of the second lining of the tunnel; and repeating steps B to E to complete the pouring of all sections of the second lining of the tunnel.

[0027] The inner end plate and the outer end plate overlap together. The inner end plate is provided with a storage through hole 21 distributed in the up-down direction, and the storage through hole is provided with a transparent isolation plate 22 at one end of the connecting shaft, which isolates a storage hole 23 in the storage through hole. The storage through hole is provided with a small diameter section at one end of the connecting shaft to form a support step 24, and the isolation plate is supported on the support step. The isolation plate is detachably installed in the storage hole, and the side of the isolation plate away from the small diameter section is covered with a transparent protective film 25. The storage hole stores phenolphthalein powder.

[0028] Example two, the difference from example one is:

[0029] Reference Figures 5 to 8The end of the connecting seat of the bottom template is provided with a guide groove 26 distributed along the circumference of the bottom template, both ends of the guide groove in the width direction are provided with a barb groove 27, the connecting seat includes a connecting plate 28 outside the guide groove and a clamping strip 29 penetrating through both ends of the barb groove, the clamping strip is screw-connected with a clamping screw 30, the clamping screw penetrates through the connecting plate, the head of the clamping bolt drives the connecting plate to cooperate with the clamping strip to clamp the groove wall of the barb groove, and the end plate part connecting lug is connected to the connecting plate. The clamping strip is provided with a supporting ball 31 for supporting on the bottom wall of the guide groove. The outer end plate is provided with a self-adapting sealing structure 32 for sealing the outer end plate and the waterproof plate together, the self-adapting sealing structure includes an elastic sealing strip 33 with an arc structure, an elastic connecting sleeve 34 for sealingly connecting the elastic sealing strip and the outer end plate together, and a plurality of cylinder bodies 35 arranged in the outer end plate, a piston 36 is slidingly and sealingly connected in the cylinder body, the piston is connected with the elastic sealing strip through a piston rod 37, the piston rod penetrates through the elastic connecting sleeve, the elastic sealing strip is pressed on the waterproof plate through the piston rod, the diameter of the circle where the elastic sealing strip is located is greater than the diameter of the circle where the waterproof plate is located, the piston separates the cylinder body into a rod cavity 38 and a rodless cavity 39, and all the piston rods are distributed along the circumference of the waterproof plate. An elastic sealing layer 40 is arranged on the side surface of the elastic sealing strip in contact with the waterproof plate, the rod cavities of all the cylinder bodies are communicated with a first fluid inlet and outlet 41, and the rodless cavities are communicated with a second fluid inlet and outlet 42. All the cylinder bodies are distributed along the radial direction of the bottom template, one end of the rod cavity is provided with an avoiding channel 43 for the piston rod to pass through, and the piston rod is sealingly connected with the end wall of the avoiding channel away from the piston.

[0030] It should be noted that the relational terms herein such as first and second and the like are used solely to distinguish one entity or action from another, without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises... " does not, without more limitations, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the recited element.

[0031] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A method for pouring concrete for a second lining of a tunnel, characterized in that, The tunnel second lining concrete pouring mold is completed by a tunnel second lining concrete pouring mold, which comprises a formwork trolley, a water stop belt, an end formwork sheet, a bottom formwork arranged on the formwork trolley and a connecting seat arranged at one end of the bottom formwork, the bottom formwork is used for forming an inner circumferential surface of the tunnel second lining, an arc-shaped waterproof plate is arranged on the inner circumferential surface of the tunnel bottom lining, the end formwork sheet comprises an inner end plate, a middle end plate, an outer end plate and two groups of crosspiece assemblies distributed along the circumference of the bottom formwork, the inner end plate, the middle end plate and the outer end plate are distributed along the radial direction of the bottom formwork, the inner end plate is provided with an inner end plate connecting lug, the inner end plate connecting lug is provided with an inner end plate connecting hole, the inner end plate connecting hole is provided with an inner end plate threaded hole penetrating through the surface of the inner end plate connecting lug, and an inner end plate locking bolt is threadedly connected in the inner end plate threaded hole, the middle end plate is provided with a middle end plate connecting lug, the middle end plate connecting lug is provided with a middle end plate connecting hole, the middle end plate connecting hole is provided with a middle end plate threaded hole penetrating through the surface of the middle end plate connecting lug, and a middle end plate locking bolt is threadedly connected in the middle end plate threaded hole, the outer end plate is provided with an outer end plate connecting lug, the outer end plate connecting lug is provided with an outer end plate connecting hole, the outer end plate connecting hole is provided with an outer end plate threaded hole penetrating through the surface of the outer end plate connecting lug, and an outer end plate locking bolt is threadedly connected in the outer end plate threaded hole, the crosspiece assembly comprises a connecting shaft and two groups of end head plate connecting lugs distributed along the extension direction of the connecting shaft, the end head plate connecting lug is fixed on the connecting seat, the same group of end head plate connecting lugs comprises two end head plate connecting lugs distributed along the direction perpendicular to the connecting shaft, the end head plate connecting lug is provided with a connecting lug through hole, the connecting shaft is simultaneously arranged in the two connecting lug through holes of the two groups of end head plate connecting lugs, a rotation-stopping screw is simultaneously arranged in the two connecting lug through holes of the other group of end head plate connecting lugs, and the rotation-stopping screw is connected to a nut together after being separated, the connecting shaft is simultaneously arranged in the inner end plate connecting hole, the middle end plate connecting hole and the outer end plate connecting hole, the inner end plate locking bolt, the middle end plate locking bolt and the outer end plate locking bolt are all abutted on the connecting shaft, the inner end plate and the middle end plate clamp the water stop belt, and the outer end plate is abutted on the waterproof plate, the process of pouring the tunnel second lining comprises the following steps: A, pouring preparation: pouring the first section of the tunnel second lining, connecting a plurality of connecting seats provided with end head plate connecting lugs and distributed along the circumference of the bottom formwork on the end surface of the bottom formwork; B, trolley positioning: moving the trolley to the end of the bottom formwork away from the connecting seat and overlapping the poured tunnel second lining section, so that the two connecting shafts are connected to the connecting seats located at the two ends of the bottom formwork in the circumferential direction. C, forming a partial cavity of the second lining of the tunnel: rotating the connecting shaft to the inner end plate to lap on the end face of the bottom mold plate or the connecting seat, making the outer end plate and the waterproof plate seal and abut together, tightening the anti-loose nut after threading the anti-rotation screw, so as to prevent the connecting shaft from rotating, the end mold plate, the bottom mold plate, the tunnel bottom lining and the poured tunnel second lining form a partial cavity of the tunnel second lining; D, pouring: pouring concrete in the partial cavity of the tunnel second lining to form a partial segment of the tunnel second lining after solidification; E, end mold plate displacement: remove the connecting shaft and connect it to the connecting seat adjacent to the poured partial segment of the tunnel second lining, repeat C to D, pour the second partial segment of the tunnel second lining in the same tunnel second lining segment; repeat C to E to complete the pouring of a tunnel second lining segment; repeat B to E to complete the pouring of all tunnel second lining segments.

2. The method for pouring the second lining concrete of a tunnel according to claim 1, characterized in that, The middle end plate and the outer end plate are lapped together.

3. A method of pouring a second lining of a tunnel according to claim 1 or 2, characterized in that, The inner end plate is provided with a storage through hole distributed in the up-down direction, and the storage through hole is provided with a transparent isolation plate at one end of the connecting shaft, and the isolation plate isolates a storage hole in the storage through hole.

4. The method of claim 3, wherein the second lining concrete is poured in a tunnel, and The storage through hole is provided with a small diameter section at one end of the connecting shaft to form a support step, the isolation plate is supported on the support step, the isolation plate is installed in the storage hole, the isolation plate is supported on the support step, the isolation plate is installed in the storage hole, and the isolation plate is supported on the support step.

5. The method of claim 3, wherein the second lining concrete is poured in a tunnel, and The storage hole stores phenolphthalein powder; when the pouring height reaches the storage hole, the concrete contacts the phenolphthalein powder and turns red.

6. A method of pouring a second lining of a tunnel according to claim 1 or 2, characterized in that, The end of the bottom mold plate provided with the connecting seat is provided with a guide groove distributed in the circumferential direction of the bottom mold plate, both ends of the guide groove in the width direction are provided with a barb groove, the connecting seat includes a connecting plate outside the guide groove and a clamping strip threaded in both barb grooves, the clamping strip is threadedly connected with a clamping screw, the clamping screw is threaded on the connecting plate, the head of the clamping bolt drives the connecting plate to clamp the groove wall of the barb groove with the clamping strip, and the end plate part connecting ear is connected to the connecting plate; after pouring in one part, loosen the clamping screw, then move the connecting seat to the desired position along the guide sliding groove, and then lock the clamping screw to fix the connecting seat.

7. A method of pouring a second lining of a tunnel according to claim 6, characterized in that, The clamping strip is provided with a support ball for supporting on the bottom wall of the guide groove.

8. The method of claim 1, wherein the method further comprises: The outer end plate is provided with a self-adaptive sealing structure for sealing the outer end plate and the waterproof plate together, the self-adaptive sealing structure includes an elastic sealing strip with an arc structure, an elastic connecting sleeve for sealing and connecting the elastic sealing strip and the outer end plate together, and a plurality of cylinder bodies arranged in the outer end plate, the cylinder body is slidably connected with a piston, the piston is connected with the elastic sealing strip through a piston rod, the piston rod is threaded in the elastic connecting sleeve, the elastic sealing strip is pressed on the waterproof plate through the piston rod, the diameter of the circle where the elastic sealing strip is located is greater than the diameter of the circle where the waterproof plate is located, the piston separates the cylinder body into a rod cavity and a rodless cavity, and all the piston rods are distributed in the circumferential direction of the waterproof plate.

9. The method of claim 8, wherein the second lining concrete is poured in a tunnel, and The side surface of the elastic sealing strip in contact with the waterproof plate is provided with an elastic sealing layer, all the rod cavities of the cylinder bodies are communicated with the first fluid inlet and outlet, and the rodless cavities are communicated with the second fluid inlet and outlet.

10. A method of pouring a second lining of a tunnel according to claim 8 or 9, characterized in that, All the cylinder bodies are distributed along the radial direction of the bottom mold plate, one end of the rod cavity is provided with an avoiding channel for the piston rod, and the piston rod is sealingly connected with the end wall away from the piston end of the avoiding channel.

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