Double-liquid grouting shield tail small oil cylinder grouting head structure

Abstract

The utility model relates to the technical field of shield tunneling machine grouting, in particular to a double-fluid grouting shield tail small oil cylinder grouting head structure which comprises a shield tail, a fluid pipe A, a small oil cylinder, a fluid pipe B, a flushing pipe, a piston, a grouting head and two sets of seals. The small oil cylinder extends out of the grouting head at the front end to block a channel between the shield tail and a soil body gap, a sealing cavity is formed to achieve the backwashing function, washing water is injected through the washing pipe, then backwashing is conducted on the A liquid pipe and the B liquid pipe, the grouting head adopts the combination of a conical surface and a step surface at a double-liquid slurry outlet, and therefore backwashing is achieved. Better sealing performance, stronger wear resistance and wider application range are achieved; a good sealing effect can be achieved in medium fluid control under different working conditions of high temperature, high pressure, large flow, easy scaling and easy blocking.

Description

Technical Field

[0001] The utility model relates to the technical field of shield machine grouting, in particular to a grouting head structure of a double-fluid grouting shield tail small oil cylinder. Background Art

[0002] During the construction process of a shield machine, grouting operations are required. Currently, the traditional grouting system is single-fluid grouting. To improve the grouting efficiency, it is optimized to double-fluid grouting, and the grouting operation is carried out through the grouting head of the double-fluid pipe grouting shield tail small oil cylinder.

[0003] However, in the aforementioned prior art, the sealing performance between the grouting head and the double-fluid slurry outlet is not good, and it is easily damaged, affecting the use. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a grouting head structure of a double-fluid grouting shield tail small oil cylinder, which solves the problems in the prior art that the sealing performance between the grouting head and the double-fluid slurry outlet is not good, and it is easily damaged, affecting the use.

[0005] To achieve the above purpose, the utility model provides a grouting head structure of a double-fluid grouting shield tail small oil cylinder, which includes a shield tail, an A-fluid pipe, a small oil cylinder, a B-fluid pipe, a flushing pipe, a piston, a grouting head, and two groups of seals. The A-fluid pipe and the B-fluid pipe are both arranged inside the shield tail, and the A-fluid pipe is communicated with the B-fluid pipe. A sliding pipe sleeve is arranged inside the shield tail, and the small oil cylinder and the grouting head are both arranged inside the sliding pipe sleeve. The piston is arranged at the output end of the small oil cylinder. The sliding pipe sleeve is communicated with the A-fluid pipe and the B-fluid pipe. The shield tail has a stepped surface and a conical surface, and the grouting head is mutually adapted to the stepped surface and the conical surface. The two groups of seals are sequentially arranged at both ends of the piston, and an end face seal is arranged on the stepped surface of the grouting head. The flushing pipe is arranged inside the shield tail, and the flushing pipe is communicated with the B-fluid pipe.

[0006] Among them, the grouting head structure of the double-fluid grouting shield tail small oil cylinder further includes a limit switch, and the limit switch is arranged on the small oil cylinder.

[0007] Among them, the grouting head structure of the double-fluid grouting shield tail small oil cylinder further includes a PLC controller, and the PLC controller is arranged on the small oil cylinder.

[0008] Among them, the grouting head structure of the double-fluid grouting shield tail small oil cylinder further includes a one-way valve, and the one-way valve is arranged on the flushing pipe.

[0009] Among them, the small oil cylinder is located at one end of the grouting head away from the stepped surface.

[0010] A double-fluid grouting shield tail small oil cylinder grouting head structure of the present utility model. The grouting head at the front end where the small oil cylinder extends blocks the channel between the shield tail and the gap of the soil body, forming a sealed cavity to realize the backwashing function, avoiding the leakage of flushing water. Flushing water is injected through the flushing pipe, and then the A liquid pipe and the B liquid pipe are backwashed. Therefore, compared with the prior art, the combination of the conical surface and the stepped surface adopted by the grouting head at the double-fluid slurry outlet has better sealing performance, stronger wear resistance and a wider application range; it can achieve good sealing effect in the control of medium fluids under different working conditions of high temperature, high pressure, large flow rate, easy scaling and easy blockage. Brief Description of the Drawings

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art.

[0012] Figure 1 It is a schematic structural diagram of the whole of the present utility model.

[0013] Figure 2 It is of the present utility model Figure 1 Enlarged partial structural view at position A.

[0014] 1 - Shield tail, 2 - A liquid pipe, 3 - Small oil cylinder, 4 - B liquid pipe, 5 - Flushing pipe, 6 - Grouting head, 7 - Seal, 8 - Sliding bushing, 9 - Stepped surface, 10 - Piston, 11 - Conical surface, 12 - Limit switch, 13 - PLC controller, 14 - Check valve. Detailed Embodiment

[0015] The following will describe in detail the embodiments of the present utility model. The examples of the embodiments are shown in the drawings. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present utility model, and should not be construed as a limitation to the present utility model.

[0016] Please refer to Figure 1 and Figure 2, the present utility model provides a double - liquid grouting shield tail small oil cylinder grouting head structure, including a shield tail 1, an A - liquid pipe 2, a small oil cylinder 3, a B - liquid pipe 4, a flushing pipe 5, a piston 10, a grouting head 6 and two groups of seals 7. The A - liquid pipe 2 and the B - liquid pipe 4 are both arranged inside the shield tail 1. The A - liquid pipe 2 is communicated with the B - liquid pipe 4. The shield tail 1 is internally provided with a sliding sleeve 8. The small oil cylinder 3 and the grouting head 6 are both arranged inside the sliding sleeve 8. The piston 10 is arranged at the output end of the small oil cylinder 3. The sliding sleeve 10 is communicated with the A - liquid pipe 2 and the B - liquid pipe 4. The shield tail 1 has a stepped surface 9 and a conical surface 11. The grouting head 6 is mutually adapted to the stepped surface 9 and the conical surface 11. The two groups of seals 7 are sequentially arranged at both ends of the piston 10. An end face seal is arranged on the stepped surface 9 of the grouting head 6. The flushing pipe 5 is arranged inside the shield tail 1. The flushing pipe 5 is communicated with the B - liquid pipe 4.

[0017] In this embodiment, the double - liquid grouting system of the shield tail 1 is usually equipped with components such as a double - liquid grouting pump, a synchronous double - liquid grouting pipe and the small oil cylinder 3 for grouting the shield tail 1. The synchronous grouting pipe is precisely arranged at the shield tail 1 part of the shield machine. The double - liquid slurry is transported into the A - liquid pipe 2 and the B - liquid pipe 4 through the double - liquid grouting pump arranged on the shield machine. The output end of the small oil cylinder 3 is connected to the piston 10, and the piston 10 is connected to the grouting head 6, so as to drive the grouting head 6 to move. When the grouting head 6 is worn, the grouting head 6 can be separately disassembled and replaced. The material of the grouting head is metal.

[0018] During grouting: First, the small oil cylinder 3 moves the piston 10 and the grouting head 6 to the left of A, opens A and B, and then injects slurry through A and B to form a mixed slurry. At this time, the small oil cylinder 3 starts again, and the piston 10 pushes the grouting head 6 to be adapted to the stepped surface 9 and the conical surface 11 to complete the grouting operation. The combination seal of the conical surface 11 and the stepped surface 9 adopted by the grouting head 6 at the double - liquid slurry outlet has better sealing performance, stronger wear resistance and a wider application range.

[0019] After grouting is completed, there is still double - liquid slurry remaining in the A - liquid pipe 2 and the B - liquid pipe 4. If it is not cleaned in time within a certain period, it will solidify and block, thus affecting the construction progress. At this time, the A - liquid pipe 2 and the B - liquid pipe 4 are cleaned. Before cleaning, the grouting head 6 fills the gap between the soil body and the shield tail 1, and at the same time relies on the seal 7 for end - face sealing to form a sealed cavity to realize the back - flushing function and avoid water seepage. Then, high - pressure water is injected through the flushing pipe 5 to conduct back - flushing on the A - liquid pipe 2 and the B - liquid pipe 4 at the same time.

[0020] In addition, a travel detector is built into the small oil cylinder 3, which can sense the specific position of the piston 10 moving. After the position is correct, the operations of grouting or backwashing can be carried out, thereby improving the accuracy and efficiency.

[0021] Furthermore, the double-fluid grouting shield tail small oil cylinder grouting head structure further includes a limit switch 12, and the limit switch 12 is arranged on the small oil cylinder 3.

[0022] In this embodiment, the limit switch 12 can feedback whether the telescoping is in place. After the telescoping is in place, the limit of the extended end of the small oil cylinder 3 is carried out through the limit switch 12.

[0023] Furthermore, the double-fluid grouting shield tail small oil cylinder grouting head structure further includes a PLC controller 13, and the PLC controller 13 is arranged on the small oil cylinder 3.

[0024] In this embodiment, it is controlled through the upper control panel, and the instruction is sent to the PLC controller 13, thereby controlling the operation of the small oil cylinder 3.

[0025] Furthermore, the double-fluid grouting shield tail small oil cylinder grouting head structure further includes a check valve 14, and the check valve 14 is arranged on the flushing pipe 5.

[0026] In this embodiment, the check valve 14 can close the flushing pipe 5 and the B liquid pipe 4, so that the flushing pipe 5 and the B liquid pipe 4 are not communicated with the A liquid pipe 2.

[0027] Furthermore, the small oil cylinder is located at one end of the grouting head away from the step surface 9.

[0028] The above-disclosed are only one or more preferred embodiments of the present application, and the scope of rights of the present application cannot be limited thereby. Those of ordinary skill in the art can understand all or part of the processes of implementing the above embodiments, and the equivalent changes made according to the claims of the present application still fall within the scope covered by the present application.

Claims

1. A grouting head structure of a double-fluid grouting shield tail small oil cylinder, characterized in that it includes a shield tail, an A liquid pipe, a small oil cylinder, a B liquid pipe, a flushing pipe, a piston, a grouting head, and two sets of seals. The A liquid pipe and the B liquid pipe are both arranged inside the shield tail. The A liquid pipe is communicated with the B liquid pipe. A sliding pipe sleeve is arranged inside the shield tail. The small oil cylinder and the grouting head are both arranged inside the sliding pipe sleeve. The piston is arranged at the output end of the small oil cylinder. The grouting head is installed on the piston. The sliding pipe sleeve is communicated with the A liquid pipe and the B liquid pipe. The shield tail has a stepped surface and a conical surface. The grouting head is adapted to the stepped surface and the conical surface respectively. The two sets of seals are sequentially arranged at both ends of the piston. An end face seal is arranged on the stepped surface of the grouting head. The flushing pipe is arranged inside the shield tail. The flushing pipe is communicated with the B liquid pipe.

2. The grouting head structure of the double-fluid grouting shield tail small oil cylinder according to claim 1, characterized in that the grouting head structure of the double-fluid grouting shield tail small oil cylinder further includes a limit switch, and the limit switch is arranged on the small oil cylinder.

3. The grouting head structure of the double-fluid grouting shield tail small oil cylinder according to claim 2, characterized in that the grouting head structure of the double-fluid grouting shield tail small oil cylinder further includes a PLC controller, and the PLC controller is arranged on the small oil cylinder.

4. The grouting head structure of the double-fluid grouting shield tail small oil cylinder according to claim 3, characterized in that the grouting head structure of the double-fluid grouting shield tail small oil cylinder further includes a one-way valve, and the one-way valve is arranged on the flushing pipe.

5. The grouting head structure of the double-fluid grouting shield tail small oil cylinder according to claim 4, characterized in that the small oil cylinder is located at one end of the grouting head away from the stepped surface.

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