Tunnel top arch anchor rod grout stopping device

Abstract

The utility model relates to the technical field of tunnel construction, in particular to a tunnel top arch anchor rod grout stopping device which comprises a three-way pipe, a conical rubber pipe is inserted into an upper connector of the three-way pipe, and an annular inner sealing air bag and a steel pipe elbow are installed on a lower connector and a branch pipe connector of the three-way pipe respectively. According to the grouting stopping device for the top arch anchor rod of the tunnel, the construction mode that the top arch anchor rod is firstly inserted and then grouted is changed into the mode that the top arch anchor rod is firstly grouted and then inserted, the construction technology is simplified, and material consumption is reduced; therefore, the hidden danger that the three-way pipe or the anchor rod vibrates or the connection sealing between the anchor rod inserting end and the three-way pipe connecting end fails is eliminated.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel construction, in particular to a tunnel top arch anchor rod grouting device. Background Art

[0002] The construction of tunnel mortar anchor bolts is mainly divided into two construction processes: "grouting first and then bolt insertion" and "bolt insertion first and then grouting". The "grouting first and then bolt insertion" construction process is simple. For horizontal and downward-inclined anchor bolts, the slurry is not easy to flow out during grouting and bolt insertion, so the "grouting first and then bolt insertion" method is adopted; while for upward-inclined anchor bolts, especially anchor bolts in the tunnel top arch range, if the "grouting first and then bolt insertion" method is adopted, the slurry is easily disturbed during the bolt insertion process and flows out of the hole, resulting in incomplete grouting. Therefore, for anchor bolts in the tunnel top arch range, the "bolt insertion first and then grouting" method is generally adopted.

[0003] The construction process of "inserting rods first and then grouting" is relatively complicated, and consumes more exhaust pipes, gates, and orifice plugging materials. Due to the space limitation in the hole, the diameter of the grouting pipe and exhaust pipe is small, and the required mortar must be thin slurry, otherwise the grouting pipe and exhaust pipe are prone to blockage. Thin slurry is more likely to flow out of the hole, so it is necessary to use cementitious materials to strictly block the orifice before grouting. The water supply system of most pumped storage power stations uses the method of underground cavern engineering. The top arch anchor rods of underground cavern engineering basically adopt the method of "inserting rods first and then grouting". The process is relatively complicated, the material consumption is large, the construction time is long, and the construction investment is large. Therefore, it is of great significance to study a tunnel top arch anchor rod grouting device that can use the method of "grouting first and then inserting rods" in the top arch anchor rod. When the rod is inserted, the mortar will not flow out of the orifice to ensure the density of the anchor rod, reduce material consumption, and shorten the construction time.

[0004] Therefore, it is necessary to provide a new tunnel top arch anchor grouting device to solve the above technical problems. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a tunnel top arch anchor grouting device.

[0006] The tunnel top arch anchor grouting device provided by the utility model comprises a tee pipe, a conical rubber tube is inserted in the upper interface of the tee pipe, and an annular inner sealing air bag and a steel pipe elbow are respectively installed on the lower interface and the branch pipe interface of the tee pipe;

[0007] The outer ring wall of the annular inner sealed airbag is fixedly embedded in the annular groove opened in the inner tube wall of the lower interface, and the outer ring wall of the lower interface is provided with a threaded section, on which threaded rings and a pressurized airbag distributed up and down are installed, and the bottom of the pressurized airbag is connected to the annular inner sealed airbag through a plurality of annularly distributed conduits.

[0008] Preferably, the threaded ring is threadedly connected to the threaded section of the lower interface, and a rotatable ring is rotatably connected to the bottom of the threaded ring.

[0009] Preferably, a connecting flange A and a connecting flange B are respectively fixedly fitted on the lower interface of the tee pipe and the branch pipe interface.

[0010] Preferably, the lower surface of the rotatable ring is fixedly connected to the upper wall of the pressure air bag, and the lower wall of the pressure air bag is fixedly fitted on the upper disc wall of the connecting flange A. A rotating disc is rotatably connected to the bottom of the connecting flange A and is used to block the through cavity.

[0011] Preferably, a connecting flange C is installed on the steel pipe elbow, and the connecting flange C is fixedly connected to the connecting flange B on the branch pipe interface by bolts, and a rubber gasket is clamped between the connecting flange B and the connecting flange C.

[0012] Preferably, a slit is formed in the middle of the rubber gasket, and the slit in the middle of the rubber gasket is in a "rice" shape.

[0013] Preferably, a through hole for passing through the bolt is formed in the rubber gasket, and a tab is arranged on one side of the rubber gasket.

[0014] Compared with the related art, the tunnel crown bolt grout stopping device provided by the present utility model has the following beneficial effects:

[0015] The present utility model changes the construction method of "inserting the bolt first and then grouting" for the crown bolt to the method of "grouting first and then inserting the bolt", simplifies the construction process, and reduces the material consumption. Since the expanded annular inner sealing air bag is an elastic structure, the hidden danger of the connection seal failure between the vibration of the tee pipe or the bolt or the insertion end of the bolt and the connection end of the tee pipe is eliminated. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of a preferred embodiment of the tunnel crown bolt grout stopping device provided by the present utility model;

[0017] Figure 2 is Figure 1 a schematic cross-sectional structure diagram of the shown tee pipe;

[0018] Figure 3 is Figure 2 a schematic installation structure diagram of the shown rotating disc;

[0019] Figure 4 is Figure 1 a schematic structure diagram of the shown rubber gasket. DETAILED DESCRIPTION OF THE INVENTION

[0020] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0021] The specific implementation of the present utility model is described in detail below in conjunction with specific embodiments.

[0022] See also Figures 1 to 4 The utility model provides a tunnel top arch anchor rod grouting device in an embodiment, and the tunnel top arch anchor rod grouting device includes: a three-way pipe 1, an annular inner sealing air bag 2, a conical rubber tube 6 and a steel pipe elbow 7.

[0023] In the embodiments of the present invention, please refer to Figure 1 , Figure 2 and Figure 3 A conical rubber tube 6 is inserted into the upper interface 1a of the tee pipe 1, and a connecting flange A11 and a connecting flange B12 are fixedly engaged on the lower interface 1b and the branch pipe interface 1c of the tee pipe 1, and an annular inner sealing airbag 2 and a steel pipe elbow 7 are installed on the lower interface 1b and the branch pipe interface 1c of the tee pipe 1, respectively;

[0024] The outer ring wall of the annular inner sealed airbag 2 is fixedly engaged in the annular groove opened in the inner tube wall of the lower interface 1b, and the outer ring wall of the lower interface 1b is provided with a threaded section, on which are installed a threaded ring 4 and a pressurized airbag 3 distributed up and down, and the bottom of the pressurized airbag 3 is connected to the annular inner sealed airbag 2 through a number of annularly distributed conduits, the threaded ring 4 is threadedly connected to the threaded section of the lower interface 1b, and a rotating ring 41 is rotatably connected to the bottom of the threaded ring 4, the lower surface of the rotating ring 41 is fixedly connected to the upper wall of the pressurized airbag 3, and the lower wall of the pressurized airbag 3 is fixedly engaged on the upper disk wall of the connecting flange A11, and a rotating disk 5 rotatably connected and used to seal the through cavity is installed at the bottom of the connecting flange A11.

[0025] It should be noted that the operation of the tunnel top arch anchor grouting device is as follows:

[0026] 1) After the tunnel arch anchor hole is drilled and cleaned, the grouting pipe is inserted into the bottom of the hole and pulled back 10 cm to start grouting. The grouting pipe is slowly pulled out until the anchor hole is filled with mortar;

[0027] 2) Under the action of the viscosity of the mortar itself and the friction of the anchor hole wall, the undisturbed mortar after grouting will not flow out of the hole, and the rotating disk 5 is rotated so that the rotating disk 5 blocks the cavity of the connecting flange A11 below the tee pipe 1. At this time, the small-area end of the tapered rubber tube 6 is inserted into the hole. The tapered rubber tube 6 has a certain elasticity and can be tightly attached to the hole wall to prevent leakage;

[0028] 3) When inserting the anchor rod, after rotating the rotating disk 5 to expose the cavity opening of the connecting flange A11, immediately insert the anchor rod from the lower interface 1b at the lower end of the tee pipe 1. During the insertion process of the anchor rod, the mortar will be extruded and disturbed and overflow towards the hole opening. Rotate the threaded ring 4 to slide down along the threaded section and press the pressurizing airbag 3. Thus, after the pressurizing airbag 3 is compressed, the gas inside it flows towards the annular inner sealing airbag 2. Therefore, the annular inner sealing airbag 2 extends inwards and quickly fills the gap between the anchor rod and the pipe of the lower interface 1b of the tee pipe 1. Therefore, under the action of the annular inner sealing airbag 2, the mortar cannot flow out of the lower interface 1b at the bottom of the tee pipe 1 and can only flow out towards the branch pipe interface 1c in the tee pipe 1 and pass through the rubber gasket 8 between the connecting flange B12 and the connecting flange C71 and flow out to the steel pipe elbow 7;

[0029] 4) The steel pipe elbow 7 is connected to a soft rubber hose to collect the flowing mortar, which can be reused;

[0030] 5) The tail of the anchor rod is blocked by the grout stop device and cannot be fully inserted into the hole. At this time, use a short steel bar with the same diameter as the anchor rod to push the tail of the anchor rod into the hole;

[0031] 6) After the installation of the anchor rod is completed, at this time the mortar returns to the state of no extrusion and no disturbance again. At this time, slowly remove the grout stop device to install the next anchor rod;

[0032] It should be noted that: Since the expanded annular inner sealing airbag 2 is an elastic structure, it eliminates the hidden danger of the connection seal failure between the tee pipe 1 or the anchor rod due to vibration or the connection end between the insertion end of the anchor rod and the tee pipe 1.

[0033] In the embodiment of the present utility model, please refer to Figure 1 and Figure 4 , a connecting flange C71 is installed on the steel pipe elbow 7, and the connecting flange C71 is fixedly connected to the connecting flange B12 on the branch pipe interface 1c through bolts. A rubber gasket 8 is clamped between the connecting flange B12 and the connecting flange C71. A cut 81 is opened in the middle of the rubber gasket 8, and the cut 81 in the middle of the rubber gasket 8 is in a "cross" shape. Through holes for passing bolts are opened on the rubber gasket 8, and a tab 82 is arranged on one side of the rubber gasket 8 for facilitating the installation of the rubber gasket 8.

[0034] The above are only the embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. All equivalent structural or equivalent process transformations made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied to other related technical fields, are similarly included in the patent protection scope of the present utility model.

Claims

1. A tunnel top arch anchor grouting device, characterized in that: It includes a tee (1). A conical rubber tube (6) is inserted into the upper interface (1a) of the tee (1). An annular inner sealing airbag (2) and a steel pipe elbow (7) are respectively installed on the lower interface (1b) and the branch pipe interface (1c) of the tee (1). The outer wall of the outer ring of the annular inner sealing airbag (2) is fixedly fitted in an annular groove formed in the inner pipe wall of the lower interface (1b). A threaded section is provided on the outer wall of the lower interface (1b). A threaded ring (4) and a pressurizing airbag (3) are installed on the threaded section in an up-and-down distribution. The bottom of the pressurizing airbag (3) is communicated with the annular inner sealing airbag (2) through a plurality of annularly distributed conduits.

2. The tunnel top arch anchor grouting device according to claim 1 is characterized in that: The threaded ring (4) is threadedly connected to the threaded section of the lower interface (1b), and a rotatable ring (41) is rotatably connected to the bottom of the threaded ring (4).

3. The tunnel top arch anchor grouting device according to claim 2 is characterized in that: A connecting flange A (11) and a connecting flange B (12) are respectively fixedly fitted on the lower interface (1b) and the branch pipe interface (1c) of the tee (1).

4. The tunnel top arch anchor grouting device according to claim 3 is characterized in that: The lower surface of the rotatable ring (41) is fixedly connected to the upper wall of the pressurizing airbag (3). The lower wall of the pressurizing airbag (3) is fixedly fitted on the upper disc wall of the connecting flange A (11). A rotatable disc (5) is rotatably connected to the bottom of the connecting flange A (11) and is used to block the through cavity.

5. The tunnel top arch anchor grouting device according to claim 3 is characterized in that: A connecting flange C (71) is installed on the steel pipe elbow (7). The connecting flange C (71) is fixedly connected to the connecting flange B (12) on the branch pipe interface (1c) by bolts. A rubber gasket (8) is clamped between the connecting flange B (12) and the connecting flange C (71).

6. The tunnel top arch anchor grouting device according to claim 5 is characterized in that: A slit (81) is formed in the middle of the rubber gasket (8), and the slit (81) in the middle of the rubber gasket (8) is in a "rice" shape.

7. The tunnel top arch anchor grouting device according to claim 6 is characterized in that: Through holes for passing bolts are formed in the rubber gasket (8), and a tab (82) is provided on one side of the rubber gasket (8).

Images