A tunnel secondary lining anti-cavitation longitudinal pipe withdrawal type molded grouting rotating device

Abstract

The invention discloses a tunnel secondary lining anti-emptying longitudinal pipe-retracting type molded grouting rotating device, which relates to the technical field of molded grouting of the second lining arch of the tunnel. In view of the problem that the concrete will solidify with the extension of time when pouring the second lining, the grouting pipe prefabricated on the arch will be firmly adhered, resulting in the problem that the grouting pipe cannot be pulled out when grouting backfilling. The invention adopts a rotating mechanism and a clamping mechanism, the rotating part of the rotating mechanism is fixedly connected with the clamping mechanism, and the rotating part of the rotating mechanism can drive the clamping mechanism to rotate when rotating; the rotating mechanism is a hollow structure, and the grouting pipe can be inserted into the rotating mechanism and the clamping mechanism and clamped by the clamping mechanism. The design is reasonable, the structure is ingenious, the operation is convenient, and it is easy to assemble and overhaul. It can realize the rotation of the grouting pipe very conveniently. Because it adopts hydraulic control, the clamping force and the rotation torque are large enough to meet the needs on site. In addition, such a structure will not affect the pipeline winding problem caused by the rotation of the clamping cylinder.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel secondary lining arch grouting with mold, and in particular to a tunnel secondary lining anti-emptying longitudinal pipe-retracting type tunnel secondary lining grouting with mold rotating device. Background Art

[0002] The quality defects of the tunnel secondary lining, such as hollowing and cavitation, are still common problems in the current secondary lining construction. According to the statistics of defects in the quality inspection and examination of the tunnel construction process and the quality inspection and acceptance of the completed project, there are many problems of hollowing and cavitation in the arch and waist of the secondary lining, and some of the problems are quite serious, which cause hidden dangers to the design structure and have a great impact on the operational safety of railways, highways and municipal roads. They have always been the focus of the railway, highway and municipal road construction units, railway bureaus, highway bureaus and the Quality Supervision and Administration Bureau of China Railway Corporation.

[0003] The main reasons for the voids and cavities in the arch and waist of the tunnel secondary lining are: (1) Due to poor working performance such as concrete fluidity and workability, the concrete does not flow well after being pumped into the arch formwork of the secondary lining trolley, resulting in partial failure to fill. (2) During the vibration process of the trolley arch formwork attached vibrator, the arch concrete may continue to sink and become void. (3) The designed longitudinal slope of the tunnel will cause the arch concrete to flow from the high end to the low end, which may easily cause the high end to not be filled. (4) When the concrete is capped, factors such as blockage of the pumping pipe and untimely concrete supply will cause the concrete entering the formwork to be close to initial setting and its fluidity is blocked, which may cause partial failure to fill.

[0004] The radial grouting of the RPC pipe with formwork for the second lining arch is a new technology promoted in the domestic railway tunnel construction in recent years. Before pouring concrete, the RPC grouting pipe is installed on the grouting pipe hole reserved at the center line of the trolley arch template. The pipe mouth is cut with a "cross" groove and pushed to the waterproof board and the initial support surface. The outer diameter of the pipe is 36mm and the inner diameter is 15mm. When the second lining concrete is capped and poured, it can also be judged whether the part is filled with concrete by whether the RPC pipe mouth overflows. The arch grouting with formwork is completed within 3-6 hours after the arch concrete capping is completed. Generally, 4 holes are arranged longitudinally on the 12m long second lining trolley. If the current hole is grouting, the adjacent hole is used as an exhaust hole. If the grouting pressure exceeds 1.0MPa or the adjacent hole overflows, it can be replaced with the next hole for grouting until all holes are grouted or overflowed. The grouting material with formwork can be purchased from the market as a finished micro-expansion mixture mortar, which can achieve the same strength as concrete. For specific content, please refer to the utility model patent: CN207297034U, tunnel secondary lining concrete arch backfill grouting device.

[0005] The problems with the above technical solution are: (1) Generally, a 12m trolley is equipped with 4 RPC grouting pipe holes, and the holes are arranged at intervals. Construction experience and radar detection have found that the voids and cavities in the arch concrete are irregular, and the void points may not be exactly at the grouting hole positions. Grouting may not be able to fill all the voids in the arch. (2) The grouting pipe holes and the adjacent exhaust pipe holes may not be spatially connected. Grouting and discharging the gas in the closed space is only an ideal condition. Therefore, even if the grouting pressure is reached, it may not be truly filled. (3) Radar non-destructive testing shows that this grouting process still cannot ensure that all the voids in the arch can be filled with grouting.

[0006] In order to solve the above problems, we developed a new method: a grouting pipe is set on the top of the secondary lining along the axial direction of the arch. During the grouting backfilling, the grouting pipe is pulled out while injecting slurry into the grouting pipe. However, as the concrete solidifies over time during the pouring of the secondary lining, the grouting pipe prefabricated on the top of the arch is firmly adhered, resulting in the grouting pipe being unable to be pulled out during the grouting backfilling. Summary of the invention

[0007] In order to solve the problem that the grouting pipe is stuck due to the solidification of concrete and cannot be pulled out, the present invention adopts the following technical solution:

[0008] A tunnel secondary lining anti-emptying longitudinal pipe withdrawal type molded grouting rotating device, characterized in that it comprises a rotating mechanism and a clamping mechanism, the rotating part of the rotating mechanism is fixedly connected to the clamping mechanism, and the rotating part of the rotating mechanism can drive the clamping mechanism to rotate when rotating;

[0009] The rotating mechanism is a hollow structure, and the grouting pipe can be inserted into the rotating mechanism and the clamping mechanism and clamped by the clamping mechanism.

[0010] Preferably, the rotating mechanism is a swing hydraulic cylinder, a pneumatic cylinder or an electric cylinder, and its rotating part can rotate to a certain angle;

[0011] A rotating flange is fixedly provided on the rotating part of the rotating mechanism, and the rotating flange is a hollow annular structure;

[0012] The clamping mechanism comprises a clamping fixed block, a guide rod, a movable clamping block and a clamping cylinder;

[0013] A fixing block flange is fixedly provided on one side of the clamping fixing block, and is in a hollow annular structure;

[0014] The fixed block flange matches the rotating flange, and the two are fixed to each other by bolts;

[0015] A fixed clamp block is fixedly arranged on one side of the fixed block flange, which is a U-shaped structure; a guide rod fixing ear is fixedly arranged on both sides of the fixed clamp block, and the guide rods are respectively inserted and fixed in the two guide rod fixing ears;

[0016] The lower end of the guide rod is fixedly connected with the clamping cylinder;

[0017] The movable clamping block is slidably arranged on the guide rod, and the movable clamping block is in a U-shaped structure and can be matched with the fixed clamping block;

[0018] The bottom of the movable clamping block is fixedly connected to the piston rod of the clamping cylinder, and the movable clamping block can be driven to move along the guide rod by the extension and retraction of the piston rod of the clamping cylinder.

[0019] Preferably, a fixing block flange center hole is opened at the center of the fixing block flange, and the diameter of the fixing block flange center hole is larger than the diameter of the clamped grouting pipe.

[0020] Preferably, symmetrical isosceles trapezoidal grooves are respectively formed at the centers of the fixed clamping block and the movable clamping block.

[0021] Preferably, the guide rod is a stepped cylindrical structure with steps at both ends and a smooth rod in the middle, and an external thread is provided at the bottom of the guide rod, and the bottom of the guide rod is connected to the clamping cylinder through a thread;

[0022] The top of the guide rod is inserted into the guide rod fixing ear and is fixedly connected by a nut.

[0023] Preferably, it further comprises a base, and the rotating mechanism is fixed on the base.

[0024] Preferably, the swing hydraulic cylinder is a hollow swing hydraulic cylinder that can rotate 60°.

[0025] Preferably, the clamping cylinder is a linear hydraulic cylinder, a linear pneumatic cylinder or a linear electric cylinder.

[0026] The beneficial effects of adopting this preferred technical solution include:

[0027] It has reasonable design, ingenious structure, high efficiency, good stability, easy operation, and convenient assembly and maintenance. It can easily realize the rotation of the grouting pipe. Because it adopts hydraulic control, the clamping force and rotational torque are large enough to meet the needs of the site. In addition, such a structure will not affect the problem of pipeline entanglement caused by the rotation of the clamping cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is the overall structural diagram of the present invention;

[0029] Figure 2 is a three-dimensional diagram of the clamping mechanism of the present invention;

[0030] Figure 3 is a front view of the clamping mechanism of the present invention;

[0031] Figure 4It is a left side view of the clamping mechanism of the present invention;

[0032] Figure 5 is a top view of the clamping mechanism of the present invention;

[0033] Figure 6 is a three-dimensional diagram of the clamping and fixing block of the present invention;

[0034] Figure 7 This is a front view of the clamping and fixing block of the present invention;

[0035] Figure 8 It is a left side view of the clamping and fixing block of the present invention;

[0036] Fig. 9 It is a schematic diagram of the tunnel secondary lining anti-emptying longitudinal pipe-withdrawing molded grouting rotating device after it is inserted into the grouting pipe. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the implementation mode of the present application clearer, the following will be combined with the implementation mode of the present application. Figures 1 to 9 , the technical solutions in the embodiments of the present application are clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the application for which protection is sought, but merely represents selected embodiments of the present application.

[0038] like Figure 1 As shown, a tunnel secondary lining anti-emptying longitudinal pipe-retracting molded grouting rotating device comprises a rotating mechanism 10 and a clamping mechanism 11.

[0039] The rotating mechanism 10 can be implemented by a rotating hydraulic cylinder, a swinging hydraulic cylinder, a rotating air cylinder or an electric cylinder, etc., and can even be implemented by a rotary reducer. The clamping mechanism 11 can be implemented by a clamping module of a manipulator structure or by a hydraulic cylinder, an air cylinder, etc., in short, the purpose is to clamp the grouting pipe 2.

[0040] The rotating part of the rotating mechanism 10 is fixedly connected to the clamping mechanism 11. When the rotating part of the rotating mechanism 10 rotates, it can drive the clamping mechanism 11 to rotate. The rotating mechanism 10 is a hollow structure, and the grouting pipe 2 can be inserted into the rotating mechanism 10 and the clamping mechanism 11 and clamped by the clamping mechanism 11.

[0041] Specifically, Figure 1As shown, the rotating mechanism 10 adopts a hollow swing hydraulic cylinder that rotates 60 degrees per rotation. The rotating part of the swing hydraulic cylinder is fixedly provided with a rotating flange 100, which is a hollow annular structure.

[0042] like Figures 2 to 8 As shown, the clamping mechanism 11 includes a clamping fixed block 110 , a guide rod 111 , a movable clamping block 112 and a clamping cylinder 113 .

[0043] Among them, a fixing block flange 1100 is fixedly provided on one side of the clamping fixing block 110. The fixing block flange 1100 is a hollow ring structure, and the fixing block flange 1100 matches with the rotating flange 100. The two are fixedly connected to each other by bolts.

[0044] like Figure 7 As shown, a fixing block flange center hole 1103 is opened at the center of the fixing block flange 1100, and the diameter of the fixing block flange center hole 1103 is larger than the diameter of the clamped grouting pipe 2.

[0045] like Figures 6-8 As shown, a fixed clamping block 1101 is fixedly arranged on one side of the fixing block flange 1100, which has a U-shaped structure and protrudes from one side of the fixing block flange 1100. The U-shaped fixed clamping block 1101 is arranged outside the central hole 1103 of the fixing block flange.

[0046] A guide rod fixing ear 1102 is fixed or integrally provided on both sides of the fixed clamp block 1101 , one on each side, and a guide rod 111 is passed through and fixed in each of the two guide rod fixing ears 1102 .

[0047] Both ends of the guide rod 111 are provided with steps, the middle part is a step cylindrical rod structure of a polished rod, the bottom of the guide rod 111 is provided with an external thread, and the bottom of the guide rod 111 is threadedly connected to the clamping cylinder 113. The top of the guide rod 111 is inserted into the guide rod fixing ear 1102 and fixedly connected by a nut.

[0048] The smooth rod part of the guide rod 111 is slidably provided with a movable clamping block 112, which is in a U-shaped structure and can match the fixed clamping block 1101. Both ends of the movable clamping block 112 are also provided with guide rod holes, and the guide rod 111 is inserted into the guide rod holes.

[0049] The bottom of the movable clamp block 112 is threadedly fixedly connected with the piston rod of the clamp cylinder 113. The clamp cylinder 113 is a linear hydraulic cylinder, a linear air cylinder or a linear electric cylinder. The movable clamp block 112 can be driven to move along the guide rod 111 by the extension and contraction of the piston rod of the clamp cylinder 113.

[0050] Symmetrical isosceles trapezoidal grooves are respectively provided at the centers of the fixed clamping block 1101 and the movable clamping block 112. Figure 3As shown, when the movable clamping block 112 moves upward and contacts the fixed clamping block 1101 , the waist-shaped trapezoidal grooves of the two can firmly clamp the grouting pipe 2 .

[0051] In addition, in order to fix the entire rotating mechanism 10 and the clamping mechanism 11 for easy installation and transportation, as shown in FIG. Figure 1 As shown, a base 12 is also provided, and the rotating mechanism 10 is fixed on the base 12. It should be noted that the base 12 should be made into a step shape, and the rotating mechanism 10 is fixedly installed on the step, so that the clamping mechanism 11 can be prevented from interfering with the base 12 during rotation.

[0052] When working, Fig. 9 As shown, the grouting pipe 2 is pre-buried on the second lining vault and the second lining concrete has not yet solidified, a tunnel secondary lining anti-emptying longitudinal pipe withdrawal type molded grouting rotating device is lifted onto a trolley and aligned with the grouting pipe and fixed, and then the clamping part is passed through the grouting pipe 2. Next:

[0053] 1. Control the piston rod of the clamping cylinder 113 to extend outward, and the piston rod drives the movable clamping block 112 to move toward the fixed clamping block 1101, thereby clamping the grouting pipe 2;

[0054] 2. After clamping the grouting pipe 2, control the rotating mechanism 10 to rotate 60°, and the grouting pipe 2 also rotates 60°;

[0055] 3. Control the piston rod of the clamping cylinder 113 to retract inward, and the piston rod drives the movable clamp block 112 to move in the opposite direction of the fixed clamp block 1101, thereby loosening the grouting pipe 2;

[0056] 4. Control the rotating mechanism 10 to rotate 60° in the opposite direction;

[0057] 5. Repeat steps 1 to 4. Repeat the cycle to achieve the rotation of the grouting pipe 2 and prevent the grouting pipe 2 from being fixed due to the solidification of concrete.

[0058] Through the above-mentioned device, the rotation of the grouting pipe 2 can be achieved very conveniently. Because it adopts hydraulic control, the clamping force and rotational torque are very large, which are sufficient to meet the needs of the site. In addition, such a structure will not affect the problem of pipeline entanglement caused by the rotation of the clamping cylinder 113.

Claims

1. A tunnel secondary lining anti-emptying longitudinal pipe withdrawal type molded grouting rotating device, characterized in that: It comprises a rotating mechanism (10) and a clamping mechanism (11), wherein the rotating part of the rotating mechanism (10) is fixedly connected to the clamping mechanism (11), and when the rotating part of the rotating mechanism (10) rotates, the clamping mechanism (11) can be driven to rotate; The rotating mechanism (10) is a hollow structure, and the grouting pipe (2) can be inserted into the rotating mechanism (10) and the clamping mechanism (11), and clamped by the clamping mechanism (11); The rotating mechanism (10) is a swing hydraulic cylinder, a pneumatic cylinder or an electric cylinder, and its rotating part can rotate to a certain angle; A rotating flange (100) is fixedly arranged on the rotating part of the rotating mechanism (10), and the rotating flange (100) is a hollow annular structure; The clamping mechanism (11) comprises a clamping fixed block (110), a guide rod (111), a movable clamping block (112) and a clamping cylinder (113); A fixing block flange (1100) is fixedly provided on one side of the clamping fixing block (110) and is in a hollow annular structure; The fixed block flange (1100) matches the rotating flange (100), and the two are fixed to each other by bolts; A fixed clamping block (1101) is fixedly arranged on one side of the fixed block flange (1100), and the fixed clamping block (1101) is in a U-shaped structure; a guide rod fixing ear (1102) is fixedly arranged on both sides of the fixed clamping block (1101), and the guide rods (111) are respectively inserted and fixed in the two guide rod fixing ears (1102); The lower end of the guide rod (111) is fixedly connected to the clamping cylinder (113); The movable clamping block (112) is slidably arranged on the guide rod (111), and the movable clamping block (112) is in a U-shaped structure and can be matched with the fixed clamping block (1101); The bottom of the movable clamping block (112) is fixedly connected to the piston rod of the clamping cylinder (113), and the movable clamping block (112) can be driven to move along the guide rod (111) by the extension and retraction of the piston rod of the clamping cylinder (113).

2. According to claim 1, a tunnel secondary lining anti-emptying longitudinal pipe withdrawal type molded grouting rotating device is characterized in that: A fixing block flange center hole (1103) is provided at the center of the fixing block flange (1100), and the diameter of the fixing block flange center hole (1103) is larger than the diameter of the clamped grouting pipe (2).

3. According to claim 2, a tunnel secondary lining anti-emptying longitudinal pipe withdrawal type molded grouting rotating device is characterized in that: Symmetrical isosceles trapezoidal grooves are respectively provided at the centers of the fixed clamping block (1101) and the movable clamping block (112).

4. According to claim 3, a tunnel secondary lining anti-emptying longitudinal pipe withdrawal type molded grouting rotating device is characterized in that: The guide rod (111) is a stepped cylindrical structure with steps at both ends and a smooth rod in the middle. The bottom of the guide rod (111) is provided with an external thread, and the bottom of the guide rod (111) is connected to the clamping cylinder (113) through a thread. The top of the guide rod (111) is inserted into the guide rod fixing ear (1102) and fixedly connected by a nut.

5. According to claim 4, a tunnel secondary lining anti-emptying longitudinal pipe withdrawal type molded grouting rotating device is characterized in that: It also comprises a base (12), and the rotating mechanism (10) is fixed on the base (12).

6. The tunnel secondary lining anti-emptying longitudinal pipe-retracting type molded grouting rotating device according to claim 1 is characterized by: The swing hydraulic cylinder is a hollow swing hydraulic cylinder that can rotate 60 degrees.

7. The tunnel secondary lining anti-emptying longitudinal pipe-retracting type molded grouting rotating device according to claim 1 is characterized by: The clamping cylinder (113) is a linear hydraulic cylinder, a linear air cylinder or a linear electric cylinder.

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