Bias pressure tunnel second lining anti-disengaging construction device with formwork

Abstract

The invention relates to the technical field of tunnel secondary lining arch formwork grouting, in particular to a bias tunnel secondary lining anti-disengaging formwork construction device which comprises a base, a supporting frame, a pipe retreating mechanism and clamping mechanisms, the supporting frame is fixed to the base, a tunnel secondary lining is arranged on the supporting frame, and the clamping mechanisms are arranged on the two sides of the supporting frame. A reciprocating linkage structure and a rotating structure in the pipe retreating mechanism are used for converting pipe retreating linear motion into rotating motion, mechanical self-synchronization of clamping and rotating is achieved, the time sequence difference of a hydraulic system and a servo system is eliminated, the requirements for hydraulic pressure calibration and gear clearance adjustment are canceled through an automatic one-way clamping structure in the clamping mechanism, and the clamping efficiency is improved. According to the scheme, the maintenance time consumption and the failure rate are greatly reduced, independent driving equipment is reduced through mechanical linkage, power consumption is reduced, meanwhile, the problem of void rate rebound caused by slurry spiral residues is solved, and the bottleneck of a split type framework in precision, reliability and adaptability is broken through through an inherent linkage mechanism.

Description

Technical Field

[0001] This application relates to the technical field of grouting with formwork for the arch part of the secondary lining of tunnels, and in particular to a formwork construction device for preventing voids in the secondary lining of a bias-pressure tunnel. Background Art

[0002] The problems of voids and quality defects in the secondary lining of tunnels are still relatively common problems in current secondary lining construction. From the statistical data of quality inspection and examination during the construction process of past tunnel projects, as well as the defect problems in the quality inspection and acceptance at the completion of the project, there are more voids and cavities in the arch part and the arch waist of the secondary lining. Some of the problems are relatively serious, posing potential safety hazards to the designed structure and having a greater impact on the operation safety of railways, highways, and municipal roads. It has always been a concern for railway, highway, and municipal road construction units, railway bureaus, highway bureaus, and the General Administration of Quality Supervision, Inspection and Quarantine of China Railway Corporation.

[0003] Currently, in order to address the characteristics of uneven load distribution in bias-pressure tunnels, special equipment has been designed. Its core function is to synchronously implement grouting with formwork during the pouring of secondary lining concrete, effectively preventing the phenomenon of voids at the arch crown. That is, a grouting pipe is arranged along the arch axis on the arch crown of the secondary lining. When grouting and backfilling, slurry is injected into the grouting pipe while the grouting pipe is pulled outwards.

[0004] In related technologies, since the concrete will solidify as time goes by during the pouring of the secondary lining, firmly adhering the prefabricated grouting pipe on its arch crown, resulting in the inability to pull out the grouting pipe outwards during grouting and backfilling. Therefore, the grouting pipe also needs to be equipped with an additional construction device to drive it to rotate to a certain extent while performing longitudinal pipe withdrawal. Although this device can quickly perform longitudinal pipe withdrawal and prevent adhesion between the concrete and the grouting pipe, in the current device, its rotation and clamping mostly adopt a split design. That is, the clamping mechanism relies on the linear propulsion of a hydraulic cylinder, and the rotation action is achieved through gear transmission. The kinematic coupling between the two can only be achieved through electronic control programming, lacking an inherent linkage mechanism at the mechanical level. Moreover, the response time of the hydraulic valve is not synchronized with the acceleration time of the servo motor, resulting in a position deviation at the initial stage of movement, and it is more complex during maintenance. It is necessary to regularly calibrate the hydraulic pressure and the gear meshing clearance, and each maintenance takes a long time, affecting the work efficiency. Summary of the Invention

[0005] In order to solve the problem that the clamping and rotating pipe-withdrawal structures of the existing construction device can only be achieved through electronic control programming and lack an inherent linkage mechanism at the mechanical level, this application provides a formwork construction device for preventing voids in the secondary lining of a bias-pressure tunnel.

[0006] The formwork construction device for preventing voids in the secondary lining of a bias-pressure tunnel provided by this application adopts the following technical solutions: A formwork construction device for preventing voids in the secondary lining of a bias-pressure tunnel, comprising: A base, on which a support frame is fixed; The pipe retracting mechanism is used to drive the grouting pipe to retract longitudinally during the construction of the secondary lining of the tunnel. The secondary lining of the tunnel is arranged on the support frame. The pipe retracting mechanism includes a supporting plate, a linkage pipe and a docking plate. A strip-shaped notch is arranged on the support frame. The supporting plate is slidably clamped in the strip-shaped notch. The linkage pipe is rotatably connected to the top of the supporting plate. The docking plate is coaxially fixed to one end of the linkage pipe. The clamping mechanism is used to clamp the grouting pipe. The clamping mechanism is arranged on both sides of the support frame. The clamping mechanism includes a first docking cylinder, a second docking cylinder, an installation cavity, a chuck and a clamping block. The first docking cylinder is fixed to one end of the support frame. One end of the second docking cylinder is coaxially fixed to the docking plate. The installation cavities are respectively arranged inside the first docking cylinder and the second docking cylinder. The chuck is slidably connected in the installation cavity, and through holes are arranged through the side wall of the chuck. The clamping block is slidably clamped in the through holes and partially rolls against the inner wall of the installation cavity.

[0007] By adopting the above technical solutions, the reciprocating linkage structure and the rotating structure in the pipe retracting mechanism are used to convert the linear movement of pipe retraction into a rotating movement, realizing the mechanical self-synchronization of clamping and rotation, eliminating the timing difference of the hydraulic and servo systems. And the automatic one-way clamping structure in the clamping mechanism cancels the requirements for hydraulic pressure calibration and gear clearance adjustment, greatly reducing the maintenance time and failure rate. And the mechanical linkage reduces the independent driving equipment, reduces the power consumption, and at the same time avoids the problem of the rebound of the void ratio caused by the spiral residue of the slurry. This solution breaks through the bottleneck of the split architecture in terms of accuracy, reliability and adaptability through the inherent linkage mechanism.

[0008] Optionally, the pipe retracting mechanism further includes a driven rod, a driving rod and a servo motor. One ends of the driven rod and the driving rod are rotatably connected to each other and are both located at the bottom of the support frame. The other end of the driven rod is rotatably connected to the supporting plate. The other end of the driving rod is coaxially fixed to the servo motor. The servo motor is fixed on the base.

[0009] By adopting the above technical solutions, the servo motor directly drives the driving rod, and the gap existing in the traditional gear transmission is eliminated through rigid transmission, improving the displacement accuracy of the supporting plate. And the double-rod layout integrates the driving unit at the bottom of the support frame, saving installation space compared with the split hydraulic / gear structure, and is particularly suitable for narrow tunnel environments. The servo motor is rigidly fixed to the base, avoiding the vibration offset of the traditional transmission chain.

[0010] Optionally, the pipe retracting mechanism further includes a dial rod, a limit seat and a chute. The dial rod is fixed to the side wall of the linkage pipe at the end far from the docking plate. The limit seat is fixed on the support frame and is in an arc structure. The chute is arranged on the inner wall of the limit seat. One end of the dial rod is slidably clamped in the chute.

[0011] By adopting the above technical solution, the lever is restricted by the physical constraint of the chute, so that the linear tube retraction action of the linkage tube is forcibly converted into a rotation at a predetermined angle, eliminating the angle cumulative error of the traditional electric control system.

[0012] Optionally, the chute is composed of two sections in combination, one section is a linear structure and the other section is a spiral structure.

[0013] By adopting the above technical solution, the axial stability of the lever is ensured by using the linear notch in the initial movement stage of the lever, and then the linear movement is converted into a rotational movement by using the spiral notch, so that the grouting pipe can deflect, avoiding the forced tearing due to the adhesion between the grouting pipe and the concrete, resulting in the fracture and damage of the grouting pipe.

[0014] Optionally, one end of the inner wall of the installation cavity and the chuck part are both in a conical structure and cooperate with each other.

[0015] By adopting the above technical solution, by using the cooperation of the conical structures of the inner wall of the installation cavity and the chuck, the clamping block is displaced under the axial pressure and the grouting pipe is automatically clamped and locked, avoiding the need to use a cylinder drive in the traditional structure, which is simple, efficient and practical, and can complete adaptive clamping and is applicable to a wide range.

[0016] Optionally, the clamping mechanism further includes a guide cylinder, the guide cylinder is coaxially fixed at one end of the chuck close to the inside of the installation cavity and is slidably connected in the installation cavity.

[0017] By adopting the above technical solution, the displacement direction of the chuck is guided and positioned by the guide cylinder to prevent it from shifting in the installation cavity.

[0018] Optionally, a return spring is sleeved outside the guide cylinder, one end of the return spring abuts against the chuck, and the other end abuts against the inside of the installation cavity.

[0019] By adopting the above technical solution, the elastic force of the return spring is used to push the chuck to quickly reset, so that the clamping block can quickly abut against the inner wall of the installation cavity and move axially, thereby realizing the function of quickly clamping the grouting pipe.

[0020] Optionally, a nut is threadedly connected to one end of the second docking cylinder away from the chuck, and one end of the return spring inside the second docking cylinder abuts against the nut.

[0021] By adopting the above technical solution, the nut is used to limit the return spring, and at the same time, by using the threaded connection, the depth of the nut inside the installation cavity can be adjusted, thereby adjusting the compression amount of the return spring and realizing the quick adjustment of the elastic force of the return spring.

[0022] Optionally, a hoop is rotatably sleeved outside the second docking cylinder, and a slider is also slidably clamped in a strip-shaped notch on the support frame, and the hoop is fixed on the slider.

[0023] By adopting the above technical solution, the second docking cylinder is limited and supported by the hoop and the slider, so as to avoid deformation of one end of the linkage pipe due to excessive force.

[0024] Optionally, the abutting end of the lever against the chute is a spherical structure, and lubricating grease is applied in the chute.

[0025] By adopting the above technical solution, the axis deflection angle that can be compensated by the spherical contact surface is utilized to avoid jamming, and the dynamic friction coefficient and wear rate are reduced by using the lubricating grease.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: Utilize the reciprocating linkage structure and the rotating structure in the pipe retracting mechanism to convert the linear motion of pipe retracting into rotational motion, realize the mechanical self-synchronization of clamping and rotation, eliminate the timing difference of the hydraulic and servo systems, and cancel the requirements for hydraulic pressure calibration and gear clearance adjustment through the automatic one-way clamping structure in the clamping mechanism, greatly reducing the maintenance time and failure rate, and reducing the power consumption by reducing the independent drive devices through mechanical linkage. At the same time, avoid the problem of the rebound of the void ratio caused by the residual slurry helix. This solution breaks through the bottleneck of the split architecture in terms of accuracy, reliability and adaptability through the inherent linkage mechanism; Utilize the servo motor to directly drive the driving rod, eliminate the clearance existing in the traditional gear drive through rigid transmission, improve the displacement accuracy of the supporting plate, and integrate the driving unit at the bottom of the support frame with the double-rod layout, saving installation space compared with the split hydraulic / gear structure, especially suitable for narrow tunnel environments. The servo motor is rigidly fixed to the base to avoid the vibration and offset of the traditional transmission chain; Utilize the cooperation of the tapered structure of the inner wall of the installation cavity and the chuck to make the clamping block displace under the axial pressure, and automatically clamp and lock the grouting pipe, avoiding the need to use the cylinder drive in the traditional structure, which is simple, efficient and practical, and can complete adaptive clamping, with a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic external structure diagram of a bias tunnel secondary lining anti-void belt form construction device in this embodiment.

[0028] Figure 2 is a schematic diagram of the support frame and its overall connection structure in this embodiment.

[0029] Figure 3 is a schematic diagram of the pipe retracting mechanism structure in this embodiment.

[0030] Figure 4It is a schematic diagram of the linkage pipe and its connection structure in this embodiment.

[0031] Figure 5 It is a schematic sectional structure diagram of the limit seat in this embodiment.

[0032] Figure 6 It is a schematic diagram of the clamping mechanism structure in this embodiment.

[0033] Explanation of reference numerals: 1. Base; 2. Support frame; 3. Pipe withdrawal mechanism; 31. Support plate; 32. Linkage pipe; 33. Docking plate; 34. Driven rod; 35. Driving rod; 36. Servo motor; 37. Pushing rod; 38. Limit seat; 39. Chute; 4. Clamping mechanism; 41. First docking cylinder; 42. Second docking cylinder; 43. Installation cavity; 44. Chuck; 45. Clamping block; 46. Guide cylinder; 47. Return spring; 48. Nut; 49. Hoop; 410. Slide block. Detailed implementation manners

[0034] The following is a further detailed description of the present application in conjunction with the attached Figure 1-6 drawings.

[0035] The embodiment of the present application discloses a bias tunnel secondary lining anti-void formwork construction device.

[0036] It should be noted that in the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0037] Refer to Figure 1 and Figure 2, a bias tunnel secondary lining anti-cavitation construction device with formwork, comprising a base 1, a support frame 2, a pipe withdrawal mechanism 3 and a clamping mechanism 4. The support frame 2 is fixed on the base 1, the tunnel secondary lining is arranged on the support frame 2, the clamping mechanism 4 is arranged on both sides of the support frame 2. By using the reciprocating linkage structure and the rotating structure in the pipe withdrawal mechanism 3, the linear motion of pipe withdrawal is converted into rotational motion, realizing the mechanical self-synchronization of clamping and rotation, eliminating the timing difference of the hydraulic and servo systems. And by using the automatic one-way clamping structure in the clamping mechanism 4, the requirements for hydraulic pressure calibration and gear clearance adjustment are cancelled, greatly reducing the maintenance time and failure rate. And by mechanical linkage, the number of independent driving devices is reduced, the power consumption is reduced, and at the same time, the problem of the rebound of the cavitation rate caused by the residual slurry helix is avoided. This solution breaks through the bottlenecks of the split architecture in terms of accuracy, reliability and adaptability through the inherent linkage mechanism.

[0038] Refer to Figure 3 and Figure 4 , specifically, the pipe withdrawal mechanism 3 includes a supporting plate 31, a linkage pipe 32, a docking plate 33, a driven rod 34, a driving rod 35 and a servo motor 36. The servo motor 36 directly drives the driving rod 35, and the gap existing in the traditional gear transmission is eliminated through rigid transmission, improving the displacement accuracy of the supporting plate 31. And the double-rod layout integrates the driving unit at the bottom of the support frame 2, saving installation space compared with the split hydraulic / gear structure, and is especially suitable for narrow tunnel environments. The servo motor 36 is rigidly fixed to the base 1, avoiding the vibration offset of the traditional transmission chain.

[0039] A strip-shaped notch is arranged on the support frame 2, the supporting plate 31 is slidably clamped in the strip-shaped notch, the linkage pipe 32 is rotatably connected to the top of the supporting plate 31, the docking plate 33 is coaxially fixed to one end of the linkage pipe 32, one ends of the driven rod 34 and the driving rod 35 are rotatably connected to each other and are both located at the bottom of the support frame 2, the other end of the driven rod 34 is rotatably connected to the supporting plate 31, and the other end of the driving rod 35 is coaxially fixed to the servo motor 36. The servo motor 36 is fixed on the base 1.

[0040] In the embodiment of the present application regarding the clamping mechanism 4, the clamping mechanism 4 includes a first docking cylinder 41, a second docking cylinder 42, an installation cavity 43, a chuck 44 and a clamping block 45. The first docking cylinder 41 is fixed to one end of the support frame 2, one end of the second docking cylinder 42 is coaxially fixed to the docking plate 33, the installation cavities 43 are respectively arranged inside the first docking cylinder 41 and the second docking cylinder 42, the chuck 44 is slidably connected in the installation cavity 43, and through holes are formed through the side wall of the chuck 44, the clamping blocks 45 are slidably clamped in the through holes and partially roll against the inner wall of the installation cavity 43.

[0041] In the embodiment of the present application, the pipe withdrawing mechanism 3 further includes a lever 37, a limit seat 38 and a chute 39. The lever 37 is physically restricted by the chute 39, so that the linear pipe withdrawing movement of the linkage pipe 32 is forcibly converted into a rotation at a predetermined angle, eliminating the angle cumulative error of the traditional electric control system.

[0042] Specifically, the lever 37 is fixed on the side wall of one end of the linkage pipe 32 far from the docking plate 33. The limit seat 38 is fixed on the support frame 2 and has an arc-shaped structure. The chute 39 is arranged on the inner wall of the limit seat 38, and one end of the lever 37 is slidably clamped in the chute 39.

[0043] Refer to Figure 5 , specifically, in the embodiment of the present application, regarding the chute 39, the chute 39 is composed of two sections. One section is a linear structure, and the other section is a spiral structure. The linear notch is used to ensure the axial stability of the lever 37 in the initial movement stage, and then the spiral notch is used to convert the linear movement into a rotational movement, so that the grouting pipe can deflect, avoiding the forced tearing caused by the adhesion of the grouting pipe to the concrete and resulting in the fracture and damage of the grouting pipe.

[0044] In the embodiment of the present application, one end of the inner wall of the installation cavity 43 and a part of the chuck 44 are both in a conical structure, and the two cooperate with each other. By using the conical structure of the inner wall of the installation cavity 43 and the chuck 44, the clamping block 45 is displaced under the axial pressure and automatically clamps and locks the grouting pipe, avoiding the need to use a cylinder drive in the traditional structure, which is simple, efficient and practical, and can complete self-adaptive clamping and is applicable to a wide range.

[0045] Refer to Figure 6 , specifically, the clamping mechanism 4 further includes a guide cylinder 46. The guide cylinder 46 is coaxially fixed at one end of the chuck 44 close to the inside of the installation cavity 43 and is slidably connected in the installation cavity 43. A return spring 47 is sleeved outside the guide cylinder 46. One end of the return spring 47 abuts against the chuck 44, and the other end abuts against the inside of the installation cavity 43. The displacement direction of the chuck 44 is guided and positioned by the guide cylinder 46 to prevent it from shifting in the installation cavity 43, and the elastic force of the return spring 47 is used to push the chuck 44 to quickly reset, so that the clamping block 45 can quickly abut against the inner wall of the installation cavity 43 and move axially, thereby realizing the quick clamping function for the grouting pipe.

[0046] In the embodiment of the present application, a nut 48 is threadedly connected to one end of the second docking cylinder 42 far from the chuck 44. One end of the return spring 47 inside the second docking cylinder 42 abuts against the nut 48. The nut 48 is used to limit the return spring 47, and at the same time, by using the threaded connection, the depth of the nut 48 inside the installation cavity 43 can be adjusted, thereby adjusting the compression amount of the return spring 47 and realizing the quick adjustment of the elastic force of the return spring 47.

[0047] A hoop 49 is rotatably sleeved outside the second docking cylinder 42. A slider 410 is also slidably clamped in the strip-shaped notch on the support frame 2. The hoop 49 is fixed on the slider 410 to limit and support the second docking cylinder 42, so as to prevent one end of the linkage pipe 32 from being deformed due to excessive force.

[0048] Specifically, the abutting end of the lever 37 against the chute 39 is a spherical structure, and lubricating grease is applied in the chute 39. The spherical contact surface can compensate for the axis deflection angle to avoid jamming, and the lubricating grease is used to reduce the dynamic friction coefficient and wear rate.

[0049] The implementation principle of the bias tunnel secondary lining anti-separation formwork construction device in the embodiment of the present application is as follows: First, the base 1 is fixed on one side of the trolley. During construction, first, grouting is carried out through the grouting pipe, and one end of the grouting pipe passes through the first docking cylinder 41, the linkage pipe 32 and the second docking cylinder 42. Then, the servo motor 36 is started to drive the linkage of the driven rod 34 and the driving rod 35, so as to drive the supporting plate 31 to reciprocate on the support frame 2. When withdrawing the pipe, the chuck 44 in the first docking cylinder 41 moves towards the conical surface away from the installation cavity 43, and the chuck 44 in the second docking cylinder 42 moves towards the conical surface close to the installation cavity 43. At this time, the clamping block 45 abuts against the grouting pipe under the extrusion force of the conical surface and clamps it, and the pipe withdrawal is completed through the movement of the linkage pipe 32. At the same time of withdrawing the pipe, the lever 37 slides in the chute 39 and drives the grouting pipe to rotate.

[0050] The above are all the preferred embodiments of the present application, and the protection scope of the present application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A formwork construction device for preventing the bias tunnel secondary lining from becoming void, characterized in that, Comprising: A base (1) with a support frame (2) fixed thereon; A pipe withdrawing mechanism (3) for driving the grouting pipe to longitudinally withdraw during the construction of the secondary lining of the tunnel. The secondary lining of the tunnel is arranged on the support frame (2). The pipe withdrawing mechanism (3) includes a supporting plate (31), a linkage pipe (32) and a docking plate (33). A strip-shaped notch is arranged on the support frame (2), and the supporting plate (31) is slidably clamped in the strip-shaped notch. The linkage pipe (32) is rotatably connected to the top of the supporting plate (31), and the docking plate (33) is coaxially fixed to one end of the linkage pipe (32); A clamping mechanism (4) for clamping the grouting pipe. The clamping mechanism (4) is arranged on both sides of the support frame (2). The clamping mechanism (4) includes a first docking cylinder (41), a second docking cylinder (42), an installation cavity (43), a chuck (44) and a clamping block (45). The first docking cylinder (41) is fixed to one end of the support frame (2), one end of the second docking cylinder (42) is coaxially fixed to the docking plate (33), the installation cavities (43) are respectively arranged inside the first docking cylinder (41) and the second docking cylinder (42), the chuck (44) is slidably connected in the installation cavity (43), and through holes are arranged through the side wall of the chuck (44). The clamping block (45) is slidably clamped in the through holes and partially rolls against the inner wall of the installation cavity (43).

2. The construction device for preventing the bias tunnel secondary lining from being voided with formwork according to claim 1, wherein, The pipe withdrawing mechanism (3) further includes a driven rod (34), a driving rod (35) and a servo motor (36). One ends of the driven rod (34) and the driving rod (35) are rotatably connected to each other and are both located at the bottom of the support frame (2). The other end of the driven rod (34) is rotatably connected to the supporting plate (31), and the other end of the driving rod (35) is coaxially fixed to the servo motor (36). The servo motor (36) is fixed to the base (1).

3. The construction device for preventing void formation in the secondary lining of a bias tunnel with formwork according to claim 2, characterized in that, The pipe withdrawing mechanism (3) further includes a dial rod (37), a limit seat (38) and a sliding groove (39). The dial rod (37) is fixed to the side wall of one end of the linkage pipe (32) far from the docking plate (33). The limit seat (38) is fixed to the support frame (2) and is in an arc structure. The sliding groove (39) is arranged on the inner wall of the limit seat (38), and one end of the dial rod (37) is slidably clamped in the sliding groove (39).

4. A construction device for preventing the void between the bias tunnel secondary lining and the formwork according to claim 3, characterized in that, The sliding groove (39) is composed of two sections. One section is a linear structure and the other section is a spiral structure.

5. The construction device for preventing the void between the bias tunnel secondary lining and the formwork according to claim 1, characterized in that, One end of the inner wall of the installation cavity (43) and a part of the chuck (44) are both in a conical structure and cooperate with each other.

6. The construction device for preventing the void between the secondary lining of a bias tunnel and the formwork according to claim 1, characterized in that, The clamping mechanism (4) further includes a guiding cylinder (46). The guiding cylinder (46) is coaxially fixed to one end of the chuck (44) close to the inside of the installation cavity (43) and is slidably connected in the installation cavity (43).

7. A construction device for preventing the void between the secondary lining of a bias tunnel and the formwork according to claim 6, characterized in that A return spring (47) is sleeved outside the guiding cylinder (46). One end of the return spring (47) abuts against the chuck (44), and the other end abuts against the inside of the installation cavity (43).

8. A construction device for preventing the void between the secondary lining of a bias tunnel and the formwork according to claim 7, characterized in that, One end of the second docking cylinder (42) far from the chuck (44) is threadedly connected with a nut (48), and one end of the return spring (47) inside the second docking cylinder (42) abuts against the nut (48).

9. The construction device with formwork for preventing void formation in the secondary lining of a bias tunnel according to claim 1, wherein, A hoop (49) is rotatably sleeved outside the second docking cylinder (42), and a slider (410) is also slidably clamped in a strip-shaped notch on the support frame (2), and the hoop (49) is fixed on the slider (410).

10. A construction device for preventing the voiding of the secondary lining of a bias-pressure tunnel with formwork according to claim 3, characterized in that, The abutting end of the lever (37) against the chute (39) is of a spherical structure, and lubricating grease is applied in the chute (39).

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