Backflow prevention device for post-grouting pipeline

Abstract

The utility model relates to the technical field of grouting pipelines, and discloses a backflow prevention device for a post-grouting pipeline, which comprises a pipe body, a grouting port is arranged at the upper end of the pipe body, a grout outlet is arranged at the lower end of the outer wall of the pipe body, a moving block is slidably connected to the lower end of the inner wall of the pipe body, and a circular groove is arranged at the bottom of the moving block. The top of the inner wall of the circular groove is fixedly connected with a spring, the lower end of the spring is fixedly connected with the bottom of the inner wall of the pipe body, and the top of the moving block is fixedly connected with a connecting block. According to the backflow preventing device for the post-grouting pipeline, when grouting is stopped, the moving block can move upwards under the action of the spring, the moving block drives the baffle to move upwards through the connecting block while moving upwards, and through the arrangement, the backflow preventing device has the advantages that after grouting of the grouting pipeline is stopped, the baffle can move to the position above a grout outlet under the action of the spring, and therefore the backflow preventing effect is achieved. Therefore, a good sealing effect on the grouting pipeline is achieved, the situation that cement grout flows back is effectively prevented, the backflow control efficiency is high, and the cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of grouting pipelines, in particular to a backflow prevention device for a post-grouting pipeline. Background Art

[0002] At present, post-grouting technology of bored piles is used in construction projects to strengthen the bearing capacity of the original bored pile ends and the pile body, and effectively control the settlement of the upper building. The post-grouting process uses the method of pre-burying the grouting pipe into the bored pile, and then using high-pressure grouting to perform grouting operations after the pile body reaches a certain strength;

[0003] However, during the post-grouting construction, due to the grouting pressure, the slurry penetrates into the pile or the soil at the pile end. When the grouting is stopped, the cement slurry diffuses unevenly under pressureless conditions. After grouting, the slurry is prone to backflow and cannot cover a large area, thus affecting the grouting effect.

[0004] In order to solve the above problems, the present application proposes a backflow prevention device for a post-grouting pipeline. Utility Model Content

[0005] The utility model aims to provide a backflow prevention device for a post-grouting pipeline, which is mainly used to solve the problem that when the existing grouting pipeline stops grouting, slurry is easy to flow back, a large area cannot be covered, and the grouting effect is affected.

[0006] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0007] A backflow prevention device for a post-grouting pipeline comprises a pipe body, a grouting port is provided at the upper end of the pipe body, a slurry outlet is provided at the lower end of the outer wall of the pipe body, a moving block is slidably connected to the lower end of the inner wall of the pipe body, a circular groove is provided at the bottom of the moving block, a spring is fixedly connected to the top of the inner wall of the circular groove, the lower end of the spring is fixedly connected to the bottom of the inner wall of the pipe body, the top of the moving block is fixedly connected to a connecting block, and the top of the connecting block is fixedly connected to a baffle.

[0008] The working principle and beneficial effects of the utility model:

[0009] 1. Working principle: When the grouting pipe is used, the pipe body is pre-buried in the bored pile, and the grouting port at the upper end of the pipe body is connected to the grouting machine. The slurry can be poured into the pipe body by high-pressure grouting. At this time, the slurry can push the baffle to move downward. After the baffle moves to the bottom of the slurry outlet, the slurry can be discharged through the slurry outlet. When the grouting is stopped, the spring will push the moving block to move upward. When the baffle moves to the top of the slurry outlet, it can play a better sealing role on the grouting pipe, thereby effectively preventing the slurry from flowing back and affecting the grouting effect.

[0010] 2. Beneficial effect: When grouting is stopped, the moving block will move upward under the action of the spring. While the moving block moves upward, it drives the baffle to move upward through the connecting block. The advantage of this arrangement is that after the grouting is stopped, the baffle will move to the top of the slurry outlet under the action of the spring, thereby having a better sealing effect on the grouting pipe, thereby effectively preventing the cement slurry from flowing back. This not only has high reflux control efficiency but also has low cost.

[0011] Preferably, there are multiple slurry outlets, and the slurry outlets are evenly distributed on the pipe body in a circular array. By setting the number of slurry outlets on the pipe body to be multiple, the grouting efficiency of the cement slurry can be effectively improved during grouting operations, thereby making the grouting efficiency of the grouting pipe higher.

[0012] Preferably, a fixing ring is fixedly connected to the inner wall of the tube body above the slurry outlet, and a sealing ring is fixedly connected to the bottom of the fixing ring. Through the fixing ring arranged on the inner wall of the tube body, when the baffle moves to above the slurry outlet, the fixing ring can block the baffle, thereby playing a better fixing effect on the baffle. Through the sealing ring arranged at the bottom of the fixing ring, the sealing ring can be made of rubber material. When the baffle is tightly pressed against the sealing ring at the bottom of the fixing ring, not only can the sealing of the grouting pipe be improved, thereby further reducing the backflow, but also the baffle can be better protected, thereby effectively extending the service life of the grouting pipe.

[0013] Preferably, the number of circular grooves at the bottom of the moving block is not less than four, and the circular grooves are equidistantly distributed in a circular array at the bottom of the moving block. By setting the number of circular grooves at the bottom of the moving block to be not less than four, and providing springs inside the circular grooves, the springs can exert a greater thrust on the moving block when the grouting pipe stops grouting, so that the baffle has a better sealing effect on the grouting pipe, thereby further reducing the backflow of the grouting pipe.

[0014] Preferably, the bottom of the moving block is not higher than the bottom of the slurry outlet. By setting the bottom of the moving block to be no higher than the bottom of the slurry outlet, the cement paddle can be effectively prevented from entering the bottom of the tube body and affecting the spring, thereby effectively ensuring the normal operation of the device.

[0015] Preferably, the corner of the top of the fixing ring away from the inner wall of the tube body is chamfered. By setting one side of the top of the fixing ring as a chamfer, a large amount of cement slurry can be effectively prevented from accumulating on the fixing ring and affecting the slurry discharge efficiency of the grouting pipe.

[0016] Preferably, the cross-section of the connecting block is set to an isosceles trapezoid. By setting the cross-section of the connecting block to an isosceles trapezoid, not only can the moving block drive the baffle to move with higher stability, but also a large amount of cement slurry can be effectively prevented from accumulating on the moving block, thereby making the grouting pipe more stable during grouting operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the grouting pipeline of the utility model;

[0018] Figure 2 It is a partially enlarged cross-sectional structural schematic diagram of the grouting pipeline of the utility model;

[0019] Figure 3 It is a schematic diagram of the overall structure of the moving block, the connecting block and the baffle of the utility model.

[0020] In the figure: 1, pipe body; 2, grouting port; 3, moving block; 4, circular groove; 5, spring; 6, connecting block; 7, baffle; 8, fixing ring; 9, sealing ring; 10, slurry outlet. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] See also Figure 1-3A backflow prevention device for a post-grouting pipeline comprises a pipe body 1, a grouting port 2 is provided at the upper end of the pipe body 1, when the grouting pipeline is used, the pipe body 1 is pre-buried in a bored pile, the grouting port 2 at the upper end of the pipe body 1 is connected to a grouting machine, grouting can be poured into the pipe body 1 by high-pressure grouting, a slurry outlet 10 is provided at the lower end of the outer wall of the pipe body 1, slurry can be discharged through the slurry outlet 10, the number of the slurry outlets 10 is multiple, and the slurry outlets 10 are evenly distributed on the pipe body 1 in a circular array, which can effectively improve the slurry discharge efficiency of cement slurry, thereby making the grouting efficiency of the grouting pipeline higher, the lower end of the inner wall of the pipe body 1 is slidably connected with a moving block 3, the bottom of the moving block 3 is provided with a There are circular grooves 4, and the number of circular grooves 4 at the bottom of the moving block 3 is not less than four, and the circular grooves 4 are equidistantly distributed in a circular array at the bottom of the moving block 3. The top of the inner wall of the circular groove 4 is fixedly connected with a spring 5, and the lower end of the spring 5 is fixedly connected to the bottom of the inner wall of the tube body 1. The bottom of the moving block 3 is not higher than the bottom of the slurry outlet 10, which can effectively prevent the cement blade from entering the bottom of the tube body 1 and affecting the spring 5, thereby effectively ensuring the normal operation of the device. The top of the moving block 3 is fixedly connected with a connecting block 6, and the top of the connecting block 6 is fixedly connected with a baffle 7. The grouting machine injects slurry into the inside of the tube body 1 by high-pressure grouting. At this time, the slurry can push the baffle 7 to move downward and squeeze the spring at the same time. 5 makes it in a compressed state, and after the baffle 7 moves to the bottom of the slurry outlet 10, the slurry can be discharged through the slurry outlet 10. When the grouting is stopped, the spring 5 will push the moving block 3 to move upward. When the baffle 7 moves to the top of the slurry outlet 10, it can play a better sealing role on the grouting pipeline, thereby effectively preventing the slurry from flowing back and affecting the grouting effect. The cross section of the connecting block 6 is an isosceles trapezoidal setting, which not only makes the moving block 3 more stable when driving the baffle 7 to move, but also effectively prevents a large amount of cement slurry from accumulating on the moving block 3, thereby making the grouting pipeline more stable during the grouting operation. The inner wall of the pipe body 1 is located above the slurry outlet 10 and is fixedly connected with a fixing ring 8 When the baffle 7 moves to above the slurry outlet 10, the fixing ring 8 can block the baffle 7, thereby playing a better fixing effect on the baffle 7. The corner of the top of the fixing ring 8 away from the inner wall of the pipe body 1 is chamfered, which can effectively prevent a large amount of cement slurry from accumulating on the fixing ring 8 and affecting the slurry outlet efficiency of the grouting pipeline. The bottom of the fixing ring 8 is fixedly connected with a sealing ring 9, and the sealing ring 9 can be made of rubber material. When the baffle 7 is tightly pressed against the sealing ring 9 at the bottom of the fixing ring 8, not only can the sealing of the grouting pipeline be better, thereby further reducing the backflow, but also the baffle 7 can be better protected, thereby effectively extending the service life of the grouting pipeline.

[0023] From the above, it can be seen that the specific implementation of the utility model is as follows:

[0024] When the grouting pipe is in use, the pipe body 1 is pre-buried in the bored pile, and the grouting port 2 at the upper end of the pipe body 1 is connected to the grouting machine. The slurry can be poured into the pipe body 1 by high-pressure grouting. At this time, the slurry can push the baffle 7 to move downward, and at the same time squeeze the spring 5 to put it in a compressed state. After the baffle 7 moves below the slurry outlet 10, the slurry can be discharged through the slurry outlet 10. When the grouting is stopped, the spring 5 will push the moving block 3 to move upward. When the baffle 7 moves to be tightly against the fixing ring 8 inside the pipe body 1, it can play a better sealing role on the grouting pipe, thereby effectively preventing the slurry from flowing back and affecting the grouting effect.

[0025] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A backflow prevention device for a post-grouting pipeline, comprising a pipe body (1), characterized in that: A grouting port (2) is provided at the upper end of the tube body (1), a grouting port (10) is provided at the lower end of the outer wall of the tube body (1), a moving block (3) is slidably connected to the lower end of the inner wall of the tube body (1), a circular groove (4) is provided at the bottom of the moving block (3), a spring (5) is fixedly connected to the top of the inner wall of the circular groove (4), the lower end of the spring (5) is fixedly connected to the bottom of the inner wall of the tube body (1), the top of the moving block (3) is fixedly connected to a connecting block (6), and the top of the connecting block (6) is fixedly connected to a baffle (7).

2. A backflow prevention device for post-grouting pipeline according to claim 1, characterized in that: There are a plurality of slurry outlets (10), and the slurry outlets (10) are distributed on the pipe body (1) in a circular array at equal intervals.

3. The backflow prevention device for post-grouting pipeline according to claim 1 is characterized in that: A fixing ring (8) is fixedly connected to the inner wall of the tube body (1) above the slurry outlet (10), and a sealing ring (9) is fixedly connected to the bottom of the fixing ring (8).

4. The backflow prevention device for post-grouting pipeline according to claim 1, characterized in that: The number of the circular grooves (4) at the bottom of the moving block (3) is not less than four, and the circular grooves (4) are distributed at equal distances at the bottom of the moving block (3) in a circular array.

5. The backflow prevention device for post-grouting pipeline according to claim 1, characterized in that: The bottom of the moving block (3) is not higher than the bottom of the pulp outlet (10).

6. The backflow prevention device for post-grouting pipeline according to claim 3, characterized in that: The corner of the top of the fixing ring (8) away from the inner wall of the tube body (1) is chamfered.

7. The backflow prevention device for post-grouting pipeline according to claim 1, characterized in that: The cross section of the connecting block (6) is arranged in an isosceles trapezoidal shape.

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