Tunnel lining pre-buried grouting pipe with check function

Abstract

The utility model discloses a tunnel lining preburied grouting pipe with check function relates to grouting pipe technical field, including grouting unit, grouting unit: including outer tube, inner tube, piston and spring, and the outer tube end is provided with grouting head, and the grouting head end is provided with the through -hole for the grout, and the inner tube is installed in the outer tube inside, and the inner tube is provided with the grout inlet, and the piston is slidably installed in the inner tube inside, and the piston and the inner tube inner wall are sliding seal, and the piston is connected with the spring, and the inner tube is provided with the grout hole for the communication inner tube and outer tube. When grouting, the slurry enters the piston position, and the pressure slurry piston pushes and moves downward, makes the grout hole and grout inlet intercommunication, and the slurry passes through the grout hole and is discharged from the grouting head and completes grouting, and when the slurry backflow, the piston top loses the pressure, and the spring rebound drives the piston to move upward, and the piston and the limiting body abut, cut off the grout hole and grout inlet access, can realize the effect of preventing the slurry backflow.

Description

Technical Field

[0001] This utility model relates to the field of grouting pipe technology, and in particular to a pre-embedded grouting pipe for tunnel lining with a backstop function. Background Technology

[0002] The grouting pipes in the pre-embedded grouting pipe system are used for permanent sealing of construction joints, cold joints, pipe seepage cracks, and gaps between the floor and walls in concrete. Grouting pipes are generally installed between the joints of new and old concrete. When water seeps into the joint, it can be sealed by injecting grout through PVC ports on the surface. Existing grouting pipes generally lack a backflow prevention function, and after grouting is completed, backflow is prone to occur, causing cement grout to overflow. This affects the grouting effect, wastes resources, and increases subsequent cleaning work. This application addresses these shortcomings. Utility Model Content

[0003] This utility model discloses a pre-embedded grouting pipe for tunnel lining with a backflow prevention function, which can prevent grout backflow after grouting is stopped, ensure the grouting effect, and avoid increasing the amount of subsequent cleaning work.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A tunnel lining pre-embedded grouting pipe with a backflow prevention function includes a grouting unit. The grouting unit includes an outer cylinder, an inner cylinder, a piston, and a spring. The outer cylinder is provided with a grouting head at its end, and the grouting head is provided with a through hole for grout discharge at its end. The inner cylinder is installed inside the outer cylinder and is provided with a grout inlet. The piston is slidably installed inside the inner cylinder, and the piston and the inner wall of the inner cylinder are in a sliding seal. The piston is connected to the spring. The inner cylinder has an outlet hole for connecting the inner cylinder and the outer cylinder. In the non-grouting state, the spring supports the piston, and the grout inlet and outlet hole are in a non-conductive state under the blocking effect of the piston, achieving a backflow prevention effect. In the grouting state, the piston overcomes the elastic force of the spring and moves to make the grout inlet and outlet hole conductive.

[0006] According to one embodiment of the present invention, the grouting unit further includes a guide rod connected to the piston. The guide rod is slidably connected to the inner cylinder and serves to guide the piston, so that the piston slides stably.

[0007] According to one embodiment of the present invention, the inner wall of the outer cylinder is provided with a slurry outlet groove that communicates with the slurry outlet hole. The slurry passes through the slurry outlet hole and the slurry outlet groove, and is finally squeezed out through the slurry injection head. This structure is suitable for the contact fit between the inner wall of the outer cylinder and the outer surface of the inner cylinder. In the absence of a slurry outlet groove, the outer diameter of the outer cylinder can be increased at least in the part of the slurry outlet hole, so that there is a gap between the inner wall of the outer cylinder and the outer surface of the inner cylinder, which facilitates slurry discharge.

[0008] According to one embodiment of the present invention, the tunnel lining pre-embedded grouting pipe with backstop function further includes an extension unit. The extension unit includes an extension pipe, which is installed in the inner cylinder and connected to the inner cylinder. The extension pipe can move relative to the inner cylinder, and one end of the extension pipe extends out from the grout inlet.

[0009] The extension pipe allows for adjustment of the grout inlet position, enabling the device to adapt to a wider range of grouting environments.

[0010] According to one embodiment of the present invention, the extension tube is equipped with a connecting hook, and the inner cylinder is connected to a ring body for engaging with the connecting hook. When adjusting the length of the extension tube, the connecting hook is disengaged from the ring body.

[0011] According to one embodiment of the present invention, the spring is disposed at the bottom of the piston and is fixedly installed with the bottom of the inner wall of the inner cylinder.

[0012] According to one embodiment of the present invention, the inner cylinder is equipped with a limiting body, which is used to limit the maximum distance of the piston from the slurry outlet.

[0013] According to one embodiment of the present invention, several groups of slurry outlet holes are provided and are evenly distributed along the axial and / or circumferential direction of the inner cylinder.

[0014] According to one embodiment of the present invention, the outer cylinder and the inner cylinder are fixedly connected (e.g., welded) or combined connected (e.g., bolted, threaded, etc.).

[0015] The tunnel lining pre-embedded grouting pipe with anti-backflow function provided by this utility model has the following beneficial effects: During grouting, the grout enters the piston position, and the pressure grout piston is pushed downward, so that the grout outlet and the grout inlet are connected. The grout flows from the grout outlet through the grout outlet groove and is discharged from the grouting head to complete the grouting. When the grout flows back, the top of the piston loses pressure, the spring rebounds and drives the piston to move upward. The piston abuts against the limiting body, cutting off the passage between the grout outlet and the grout inlet, thus achieving the function of preventing grout backflow, thereby ensuring the grouting effect, avoiding grout backflow that leads to waste, and avoiding the increase in the amount of subsequent cleaning work required due to grout backflow. Attached Figure Description

[0016] Figure 1 A schematic diagram of the overall structure of the pre-embedded grouting pipe for tunnel lining with anti-reverse function;

[0017] Figure 2 A schematic diagram of the cross-sectional structure of the grouting pipe pre-embedded in the tunnel lining with backstop function.

[0018] Figure 3 A cross-sectional schematic diagram of the pre-embedded grouting pipe for tunnel lining with backstop function from another perspective.

[0019] Figure 4 For the present utility model Figure 3 Enlarged structural diagram at point A in the middle.

[0020] In the diagram: 100, grouting unit; 200, extension unit; 101, outer cylinder; 102, grouting head; 103, inner cylinder; 104, piston; 105, guide rod; 106, spring; 107, grout outlet hole; 108, sliding sleeve; 109, grout outlet groove; 110, grout inlet; 111, grout outlet channel; 201, extension pipe; 202, connecting hook; 203, ring body; 204, limiting body. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] Reference Figures 1-4 A tunnel lining pre-embedded grouting pipe with backstop function includes a grouting unit 100 and an extension unit 200:

[0024] The grouting unit 100 includes an outer cylinder 101, with a grouting head 102 fixedly installed on one side of the outer cylinder 101 for grouting. An inner cylinder 103 is fixedly installed on the inner wall of the outer cylinder 101, and the inner cylinder 103 has a grout inlet 110. A piston 104 is slidably installed inside the inner cylinder 103, and a guide rod 105 is fixedly installed at the bottom of the piston 104. The guide rod 105 and the inner cylinder 103 are slidably engaged by a sliding sleeve 108 or a linear bearing, etc. When the bottom of the rod 105 extends, it can directly enter the outer cylinder 101, or a cylinder can be installed at the bottom of the inner cylinder 103 to isolate the bottom of the guide rod 105 from the inside of the outer cylinder 101. The guide rod 105 stabilizes the horizontal position of the piston 104 and prevents it from tilting. A spring 106 is installed at the bottom of the piston 104 to provide a rebound force to the piston 104. The spring 106 is fixedly installed on the inner wall of the inner cylinder 103 to stabilize the position of the spring 106.

[0025] The inner cylinder 103 has a slurry outlet hole 107 inside, and the outer cylinder 101 has a slurry outlet groove 109 inside that communicates with the slurry outlet hole 107. The slurry passes through the slurry outlet hole 107 and the slurry outlet groove 109, and is finally squeezed out through the slurry injection head 102.

[0026] Multiple grout outlet grooves 111 are provided at the grouting head 102, which can facilitate the uniform extrusion of grout.

[0027] A limiting body 204 is installed in the inner cylinder 103. The limiting body 204 is used to limit the maximum distance of the piston 104 away from the slurry outlet 107. The limiting body 204 limits the highest position of the piston 104 to prevent the spring 106 from rebounding excessively. When the extension tube 200 is installed, the lowest position of the extension tube 201 is also limited to prevent the extension tube 201 from contacting the piston 104.

[0028] When the extension unit 200 is not installed, slurry is injected through the slurry inlet 110.

[0029] When grouting is first performed, the grout enters the piston 104 position. The pressure grout piston 104 is pushed downward, so that the grout outlet 107 is connected to the grout inlet 110. The grout is discharged from the grout outlet 107 through the grout outlet groove 109 and discharged from the grouting head 102 to complete the grouting. When the grout flows back, the top of the piston 104 loses pressure, and the spring 106 rebounds, causing the piston 104 to move upward. The piston 104 abuts against the limiting body 204, cutting off the passage between the grout outlet 107 and the grout inlet 110, thus achieving the function of preventing grout backflow.

[0030] The extension unit 200 includes an extension tube 201. A connecting hook 202 is fixedly installed on the outer wall of the extension tube 201, and a ring 203 is fixedly installed on the outer wall of the inner cylinder 103. One end of the connecting hook 202 is connected to the ring 203 in a hook-like manner. The hook-like connection facilitates the overall transportation during the transportation process. After the connecting hook 202 and the ring 203 are disassembled, the extension tube 201 can be pulled out to extend and adjust the slurry inlet 110.

[0031] The extension tube 201 is slidably installed on the inner wall of the inner cylinder 103. The bottom of the extension tube 201 is connected to the inner cylinder 103. Through the extension and contraction of the extension tube 201, the device can adapt to more grouting environments.

[0032] Extension pipe 201 is an optional component. When grouting can be performed normally using the grout inlet 110 of the inner cylinder 103, extension pipe 201 does not need to be installed.

[0033] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Substitutions may include replacements for some structures, devices, or method steps, or they may be complete technical solutions. Equivalent substitutions or modifications made based on the technical solution and inventive concept of this utility model should all be covered within the scope of protection of this utility model.

Claims

1. A tunnel lining pre-embedded grouting pipe with anti-reverse function, comprising a grouting unit (100), characterized in that: Grouting unit (100): includes an outer cylinder (101), an inner cylinder (103), a piston (104), and a spring (106). The outer cylinder (101) is provided with a grouting head (102) at its end. The inner cylinder (103) is installed inside the outer cylinder (101). The inner cylinder (103) is provided with a grout inlet (110). The piston (104) is slidably installed inside the inner cylinder (103). The piston (104) is connected to the spring (106). The inner cylinder (103) is provided with a grout outlet (107) for connecting the inner cylinder (103) and the outer cylinder (101). In the non-grouting state, the grout inlet (110) and the grout outlet (107) are not connected due to the blocking effect of the piston (104). In the grouting state, the piston (104) overcomes the elastic force of the spring (106) and makes the grout inlet (110) and the grout outlet (107) connected.

2. The tunnel lining pre-embedded grouting pipe with anti-reverse function according to claim 1, characterized in that: The grouting unit (100) also includes a guide rod (105) connected to the piston (104), and the guide rod (105) is slidably connected to the inner cylinder (103).

3. The tunnel lining pre-embedded grouting pipe with anti-reverse function according to claim 1, characterized in that: The inner wall of the outer cylinder (101) is provided with a slurry outlet groove (109) that is connected to the slurry outlet hole (107).

4. The tunnel lining pre-embedded grouting pipe with anti-reverse function according to any one of claims 1-3, characterized in that: The tunnel lining pre-embedded grouting pipe with anti-reverse function also includes an extension unit (200), the extension unit (200) includes an extension pipe (201), the extension pipe (201) is installed in the inner cylinder (103) and connected to the inner cylinder (103), the extension pipe (201) can move relative to the inner cylinder (103), and one end of the extension pipe (201) extends out from the grout inlet (110).

5. The tunnel lining pre-embedded grouting pipe with anti-reverse function according to claim 4, characterized in that: The extension tube (201) is equipped with a connecting hook (202), and the inner cylinder (103) is connected to a ring body (203) for engaging with the connecting hook (202).

6. The tunnel lining pre-embedded grouting pipe with anti-reverse function according to claim 4, characterized in that: The spring (106) is located at the bottom of the piston (104) and is fixedly installed at the bottom of the inner wall of the inner cylinder (103).

7. The tunnel lining pre-embedded grouting pipe with anti-reverse function according to claim 6, characterized in that: The inner cylinder (103) is equipped with a limiting body (204) for limiting the maximum distance of the piston (104) from the slurry outlet (107).

8. The tunnel lining pre-embedded grouting pipe with anti-reverse function according to claim 1, characterized in that: Several sets of slurry outlet holes (107) are provided and are evenly distributed along the axial and / or circumferential direction of the inner cylinder (103).

9. The tunnel lining pre-embedded grouting pipe with anti-reverse function according to claim 1, characterized in that: The outer cylinder (101) and the inner cylinder (103) are fixedly connected or combined.

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