Automatic closing non-return device of pipe jacking grouting hole and grouting method

Abstract

The invention discloses an automatic closing non-return device of a pipe jacking grouting hole and a grouting method, and belongs to the technical field of pipe jacking construction corollary equipment. The automatic closing non-return device comprises a device body, a plurality of sets of grouting channels are formed in the device body, and each set of grouting channel has a non-return backflow function; a valve clack assembly is assembled at the output end of the device body, the valve clack assembly is of a hinged structure and is matched with an elastic reset piece, the valve clack assembly automatically rebounds and covers the grouting hole when no grout pressure effect exists, and sealing and plugging of the grouting hole are achieved. According to the grouting method, operation is completed through pipeline planning and assembling, high-pressure grouting and automatic non-return plugging. The device is high in anti-backflow capacity, reliable in sealing, suitable for complex geology, free of external power, compact in structure and long in service life, and effectively solves the problems that a traditional device is prone to blockage and backflow.

Description

Technical Field

[0001] This invention belongs to the technical field of supporting equipment for pipe jacking construction, specifically relating to an automatic closing and anti-reverse device for grouting holes in pipe jacking and a grouting method. Background Technology

[0002] Pipe jacking, as a core technology for trenchless pipeline laying, requires the injection of lubricating grout through grouting holes in pipe sections during construction to reduce friction between the pipe wall and the soil. Existing grouting hole closure methods have significant drawbacks: Traditional one-way check valves or rubber valves rely on slurry pressure to open and springs or their own elasticity to close. In complex geological conditions rich in mud, sand and pebbles, they are prone to clogging and jamming, and cannot close effectively. When the grouting pressure is unstable or stops, the stratum mud, water and sand are easy to backflow into the grouting pipeline and pipe section, causing pipeline blockage and equipment damage; The lack of an active sealing mechanism results in low sealing reliability, which seriously affects construction efficiency and equipment safety. Summary of the Invention

[0003] To address the technical problems existing in the background art, the present invention provides an automatic shut-off and anti-reverse device for grouting holes in jacking pipes and a grouting method.

[0004] This invention is achieved using the following technical solution: an automatic shut-off and anti-reverse device for grouting holes in jacking pipes, comprising: The device body has a connection end at one end and an output end at the other end; Several sets of grouting channels are uniformly and independently opened in the device body along the axial direction; each set of grouting channels has the function of preventing backflow. The valve assembly is assembled at the output end; the valve assembly has a hinged structure and, in conjunction with an elastic reset component, automatically rebounds and closes when there is no grout pressure, thereby achieving sealing of the grouting hole.

[0005] In a further embodiment, the connecting end is provided with a threaded structure to achieve a rotary sealing connection between the device body and the grouting pipeline.

[0006] In a further embodiment, the grouting channel includes: The main channel has its first and last ends connected to the connection end and the output end, respectively. Multiple meandering channels are staggered and connected to the main channel to form a zigzag flow channel with multiple turning points; the zigzag flow channel converges at each turning point along the direction from the connection end to the output end; and branches at each turning point along the direction from the output end to the connection end.

[0007] In a further embodiment, the valve disc assembly includes: Four sets of valve discs, each with its side edge rotatably connected to the output end of the device body via a hinged connection structure. The four sets of valve discs are evenly distributed circumferentially along the end face of the output end of the device body, forming a circular sealing surface that matches the grouting hole.

[0008] In a further embodiment, the elastic reset member includes: The embedded parts are embedded and fixed in the preset installation positions inside the device body, and the embedded parts and the device body form a stable integrated structure. The embedded base is detachably adapted and assembled with the embedded part. A high-strength spring, one end of which is fixedly connected to a pre-set connection point on the inner wall of the valve disc, and the other end is connected to a pre-embedded seat.

[0009] In a further embodiment, the number of grouting channels is even.

[0010] In a further embodiment, the inner diameter of the main channel is larger than the inner diameter of the detour channel.

[0011] In a further embodiment, each set of valve discs is an arc-shaped plate structure that is recessed towards the connection end of the device body.

[0012] A grouting method, using an automatic shut-off check device for the grouting hole of the jacking pipe as described above, includes the following steps: Based on the grouting volume requirements, pipe section length, and grouting uniformity requirements of the pipe jacking construction, and combined with the permeability characteristics of the stratum soil, the number and route planning of grouting pipelines are determined; each grouting pipeline is equipped with an automatic shut-off check device, and the connection end of the device body is sealed to the grouting pipeline through a threaded structure, and the output end is aligned and fitted with the preset grouting hole of the pipe jacking. Start the grouting pump, pressurize the lubricating slurry and introduce it into the device body. The slurry enters each group of grouting channels through the connection end and flows in the forward direction along the turn-type flow channel formed by the main channel and the detour channel. Under the action of pressure, it pushes open the valve assembly at the output end, causing the four groups of valves to rotate outward and open around the hinge connection structure, injecting the slurry. After grouting is completed, the grouting pump and grouting pipeline valves are closed. When the grout pressure disappears, the high-strength spring in the elastic reset component releases the reset tension, driving the four sets of valve discs to converge towards the center synchronously. They automatically rebound and close to form a circular sealing surface, sealing the grouting hole. At the same time, the folding flow channel of the grouting channel inhibits the reverse flow of grout through the convergence-branching structure, realizing the backflow prevention function.

[0013] The beneficial effects of the present invention are as follows: The automatic shut-off check device provided by the present invention relies on the backflow prevention structure of the grouting channel to suppress the reverse flow of grout, completely solving the problem of shut-off failure caused by debris blockage in traditional devices. Its backflow prevention capability far exceeds that of traditional one-way valves. At the same time, the force of the reverse fluid can help to press the valve disc, and with the reset pull of the high-strength spring, the grouting hole can be tightly sealed without additional driving force. This effectively avoids pipeline blockage and equipment damage caused by backflow of mud, water and sand from the stratum. The sealing effect is far superior to that of traditional one-way check valves or rubber valves.

[0014] The automatic shut-off check device of the present invention is not sensitive to particulate matter such as mud, sand and fine pebbles in the slurry, and can be stably applied to pipe jacking projects with complex geological conditions and high mud and sand content. It solves the problem of traditional devices being prone to jamming and failure under complex working conditions, and has a wider range of applications.

[0015] The grouting channel has no moving parts, making it structurally stable, wear-resistant, corrosion-resistant, and long-lasting. The working environment of the valve disc is optimized, reducing the risk of malfunctions such as debris blockage and wear, significantly lowering the overall failure rate of the device, and ensuring strong long-term stability.

[0016] The device is equipped with an even array of grouting channels, and the grout inlet and outlet are widened. The main channel is thickened. This ensures that the grout flow rate is not reduced, and the grout can evenly cover the outer wall of the jacking pipe. This reduces the problem of uneven jacking resistance caused by insufficient lubrication in some areas and improves construction efficiency.

[0017] The overall structure is compact and requires no external drive such as electricity or hydraulics. It relies entirely on fluid pressure and mechanical structure to automatically complete the opening and closing action, avoiding the safety hazards that external drive equipment may cause in underground closed construction environments. At the same time, it saves energy consumption and is in line with the concept of green construction.

[0018] Finally, the grouting pipe connection point adopts a threaded structure, which can be quickly rotated and tightened with conventional grouting pipes without the need for special tools; the elastic reset component cooperates with the pre-embedded part through a detachable pre-embedded seat, and the valve disc core component does not need to be disassembled when replacing the high-strength spring, simplifying the maintenance process and reducing construction and operation and maintenance costs. Attached Figure Description

[0019] Figure 1 This is a structural diagram of an automatic shut-off check device for a grouting hole in a jacking pipe according to Embodiment 1.

[0020] Figure 2 This is a cross-sectional view of the grouting channel in Example 1.

[0021] Figure 3 This is a structural diagram of the valve disc assembly in Example 1.

[0022] Figure 4 This is a disassembled diagram of the valve disc assembly in Example 1.

[0023] Figure 5 This is a cross-sectional view of the elastic reset member of Embodiment 1.

[0024] Figure 6 This is a schematic diagram of the jacking pipe configuration in Example 2.

[0025] Figures 1 to 6 The components are labeled as follows: device body 1, jacking pipe 2, grouting channel 101, valve disc 102, threaded structure 103, elastic reset component 104, main channel 101-a, detour channel 101-b, embedded component 104-a, embedded seat 104-b, and high-strength spring 104-c. Detailed Implementation

[0026] The present invention will now be further described with reference to the accompanying drawings and embodiments.

[0027] Example 1 like Figure 1 As shown in the figure, this embodiment discloses an automatic shut-off and anti-reverse device for the grouting hole of the jacking pipe 2, which is adapted to the conventional grouting pipeline in the construction of the jacking pipe 2. It can realize smooth grout delivery during the grouting process and automatic anti-reverse sealing after grouting. The specific structure, assembly and usage are as follows: The automatic shut-off check device in this embodiment uses a tubular device body 1 as the supporting structure. One end of the device body 1 is the connecting end and the other end is the output end. The overall structure is compact and adaptable to the grouting hole installation space on the jacking pipe 2 section. It can be directly embedded into the preset installation position or fixed to the end face of the grouting hole.

[0028] A valve assembly is installed at the output end of the device body 1. The valve assembly is a hinged structure and, together with the elastic reset member 104, automatically rebounds and closes when there is no grout pressure, thereby achieving the sealing and plugging of the grouting hole.

[0029] In this embodiment, the device body 1 is provided with several sets of grouting channels 101 along the axial direction, and the several sets of grouting channels 101 are spatially independent, and each set of grouting channels 101 has the function of preventing backflow.

[0030] Furthermore, the connecting end, as the connection structure with the grouting pipeline, is provided with a threaded structure 103, which is used to achieve a sealed connection with the conventional grouting pipe by rotating and tightening. No special adapter tools are required, the assembly is convenient and the connection is stable, and it can effectively avoid the problem of grout leakage during high-pressure grouting.

[0031] To achieve the requirements of smooth forward grout delivery and efficient reverse backflow prevention during the grouting process, while ensuring that the grouting volume meets the lubrication and drag reduction requirements of the pipe jacking 2 construction, the grouting channel 101 described in this embodiment is as follows: Figure 2 As shown, it includes: The main channel 101-a has its first end connected to the internal cavity of the device body 1, and its tail end extends to the output end face to form a slurry outlet.

[0032] Multiple meandering channels 101-b are evenly distributed in an alternating pattern and are fully connected to the main channel 101-a, forming a zigzag flow channel with multiple turning points. The zigzag flow channel converges at each turning point along the direction from the connection end to the output end; and branches at each turning point along the direction from the output end to the connection end.

[0033] The layout of the bend-type flow channel described in this embodiment has a clear directional adaptation: along the forward flow direction of the slurry from the connection end to the output end, the bend points are arranged in a gradient convergence pattern, and the slurry dispersed into the main channel 101-a and the detour channel 101-b gradually converges towards the outlet during the flow process, reducing energy loss caused by fluid collisions and achieving concentrated and smooth slurry output. Along the reverse flow direction of the slurry from the output end to the connection end, the bend points are arranged in a branching pattern, and the reverse-flowing slurry is divided into multiple branches at the bend points. Each branch needs to change its flow direction multiple times to pass through the flow channel, significantly increasing the frictional resistance and local resistance of the reverse flow.

[0034] To balance grout delivery efficiency and backflow prevention reliability during the grouting process, the inner diameter of the main channel 101-a in this embodiment is larger than that of the detour channel 101-b. This is achieved through a differentiated flow channel inner diameter structure: the main channel 101-a, as the core channel for grout delivery, has a larger inner diameter to ensure rapid and smooth passage of high-pressure grout, meeting the grouting volume requirements for pipe wall lubrication during pipe jacking construction; the detour channel 101-b, as an auxiliary flow channel and key backflow prevention structure, has a smaller inner diameter and a branched arrangement of the turning flow channel, further increasing friction resistance when the grout flows in the opposite direction, making it difficult for the reverse grout to form effective flow. Simultaneously, it works synergistically with the main channel 101-a to enhance the unidirectional flow characteristics of the flow channel, avoiding the weakened backflow prevention effect caused by consistent channel inner diameters without affecting the forward grouting efficiency. The folding structure of the flow channel can prevent impurities such as mud, sand and small pebbles in the strata from entering the device, reducing the wear and jamming of the valve disc 102 hinge structure and the elastic reset member 104 caused by impurities. At the same time, it avoids the channel blockage from affecting the backflow prevention effect, and is suitable for the use needs of complex geological conditions.

[0035] This structure gives the grouting channel 101 wear-resistant and corrosion-resistant properties, with no easily damaged moving parts, which greatly improves the service life and reliability of the channel and completely solves the problems of closure failure and backflow of mud and water in the formation caused by debris blockage in traditional devices.

[0036] In a further embodiment, the detour channel 101-b described in this embodiment may be eight groups, circumferentially distributed at equal intervals within the device body 1.

[0037] The output end of the device body 1 is equipped with a hinged valve assembly. The valve assembly works in conjunction with the elastic reset member 104 to achieve automatic springback closing after grouting.

[0038] like Figure 3 As shown, the valve assembly includes four sets of valve discs 102. The side edge of each set of valve discs 102 is rotatably connected to the end face of the output end of the device body 1 through a high-strength hinge connection structure. The hinge connection structure adopts an embedded structure, which is completely embedded in the preset groove of the output end of the device body 1. The groove and the shape of the hinge connection structure are precisely matched. After assembly, the hinge connection structure and the end face of the output end form a flush surface without protrusions or gaps, thus structurally preventing slurry leakage and impurities from entering the hinge part. Figure 3 To highlight the hinged connection structure, the embedded aspect was not shown; it was only for structural purposes.

[0039] Furthermore, the four sets of valve discs 102 are evenly distributed circumferentially along the output end face, naturally forming a circular sealing surface that precisely matches the diameter of the grouting hole in the jacking pipe 2. Each set of valve discs 102 is an arc-shaped plate structure that is recessed towards the connection end of the device body 1.

[0040] The structural optimization meets the following requirements: Firstly, it adapts to the fluid direction of the grout outlet of the grouting channel 101, enabling the high-pressure grout to efficiently push the valve disc 102 open, reducing energy loss in grout flow; secondly, when closed, the arc-shaped surface of the valve disc 102 can tightly fit with the end face of the output end and the edges of adjacent valve discs 102, achieving positioning in conjunction with the embedded hinge connection structure. After the four sets of valve discs 102 converge synchronously, they form a complete and gapless sealing surface, completely avoiding sealing dead angles. At the same time, the embedded design prevents the hinge connection from being exposed to the outside and being eroded by mud, sand, and grout, thus affecting the sealing performance and further improving the overall sealing reliability of the device.

[0041] To ensure timely and reliable sealing of the output end of the device body 1 after grouting, preventing backflow of mud, water, and sand from the stratum, and to adapt to the stress requirements of the valve assembly, ensuring the synchronicity and sealing of the rebound closing. Figure 5 As shown, the elastic reset member 104 described in this embodiment includes: The embedded part 104-a is made of corrosion-resistant alloy material and is embedded and fixed in the preset installation position inside the device body 1. It forms a stable integrated structure with the device body 1 by casting or welding, providing a stable installation benchmark for elastic reset and ensuring that no displacement or shaking occurs when subjected to force.

[0042] The embedded base 104-b is adapted to the embedded part 104-a via bolts or a snap-fit ​​detachable structure. The embedded base 104-b is provided with a slot or threaded interface that aligns with the high-strength spring 104-c, enabling quick positioning and fixing of the spring. The high-strength spring 104-c is made of high-strength alloy spring steel. Its elasticity parameters are set according to requirements to ensure that it can be easily pushed open by high-pressure grout and can quickly release sufficient reset tension after the grout pressure disappears. One end of the high-strength spring 104-c is fixedly connected to the middle position of each group of valves 102 (such as by welding or full-fit fixing with hanging holes and hooks) to ensure stable and loose tension transmission; the other end is detachably connected to the assembly structure of the pre-embedded seat 104-b. Through the stable assembly of the pre-embedded part 104-a and the pre-embedded seat 104-b, the high-strength spring 104-c always maintains the preset tension. After grouting is completed, it can instantly drive the four groups of valves 102 to converge synchronously towards the center, realizing timely sealing of the output end. Combined with the anti-reverse function of the grouting channel 101, it forms double protection.

[0043] Example 2 This embodiment discloses a grouting method. This method uses an automatic shut-off and anti-reverse device for the grouting hole of the aforementioned pipe jacking 2, which is suitable for pipe jacking 2 construction scenarios with high mud and sand content and complex geological conditions. It can achieve smooth grouting and reliable anti-reverse sealing. The specific steps are as follows: Based on the grouting volume requirements of pipe jacking 2 construction, the length of pipe jacking 2 sections, and the requirements for grout uniformity, and considering the permeability characteristics of the stratum soil, the number and route planning of grouting pipelines are determined; ensuring that the grouting can fully cover the outer wall of pipe jacking 2, avoiding excessive jacking resistance due to insufficient local lubrication, such as... Figure 6 As shown, in this embodiment, four grouting pipelines are configured for the jacking pipe 2, and corresponding automatic shut-off check devices are installed.

[0044] Each grouting pipeline is equipped with an automatic shut-off check device. The connection end of the device body 1 is sealed to the grouting pipeline through the threaded structure 103, and the output end is aligned and fitted with the preset grouting hole of the jacking pipe 2. The grouting pump is started, and the lubricating grout is pressurized and introduced into the main body 1 of the device. The grout enters each group of grouting channels 101 through the connecting end and flows in the forward direction along the turn-type flow channel formed by the main channel 101-a and the detour channel 101-b. Under the action of pressure, the valve assembly at the output end is opened, causing the four groups of valves 102 to rotate outward around the hinge connection structure and open, injecting grout. The grout flows in the forward direction along the turn-type flow channel formed by the main channel 101-a and the detour channel 101-b of each group of grouting channels 101. The main channel 101-a is thickened to ensure the grout flow efficiency, and the detour channel 101-b is staggered and connected with the main channel 101-a to form a multi-bend structure. Under the high pressure of the grout, the valve assembly at the output end of the fluid continuously pushes the valve, causing the four sets of arc-shaped inwardly recessed valves 102 to rotate outward synchronously around the embedded hinge connection structure. The grout is evenly injected into the space between the outer wall of the jacking pipe 2 and the stratum soil through the flow channel formed by the valves 102, forming a lubricating and drag-reducing layer.

[0045] After grouting is completed, the grouting pump and grouting pipeline valves are closed. When the grout pressure disappears, the high-strength spring 104-c in the elastic reset component 104 releases the reset tension, driving the four sets of valve discs 102 to converge towards the center synchronously, automatically rebounding and closing to form a circular sealing surface, sealing the grouting hole. At the same time, the folding flow channel of the grouting channel 101 suppresses the reverse flow of grout through the convergence-branching structure, realizing the backflow prevention function.

[0046] The mechanical seal of valve disc 102 forms a double protection, effectively preventing mud, water and sand in the stratum from flowing back into the grouting pipeline and the inside of the device body 1, ensuring the cleanliness and safety of the equipment and pipeline, and completing this grouting operation.

[0047] It should be noted that when the high-strength spring 104-c loses its elasticity, is damaged, or needs to be adapted to different grouting pressures, first disconnect the connection between the device body 1 and the grouting pipeline, separate the embedded seat 104-b and the embedded part 104-a, and release the connection between the old high-strength spring 104-c and the embedded seat 104-b; retain the fixed connection between the old spring and the valve disc 102 and remove the old spring, replace it with a new high-strength spring 104-c that meets the elasticity requirements, keep one end of the new spring fixedly connected to the valve disc 102, and connect the other end to the embedded seat 104-b, then assemble and fix the embedded seat 104-b and the embedded part 104-a, and finally reconnect the device body 1 and the grouting pipeline.

Claims

1. An automatic closing and reverse stopping device for a pipe jacking grouting hole, characterized in that, The utility model relates to a kind of automatic closing and reverse flow stopping device for pipe jacking construction, including: Device body, one end is connected end, the other end is output end; Several groups of grouting channels are evenly and independently opened in the device body along the axial direction;Each group of grouting channels has a reverse flow stopping function; Valve assembly is assembled in the output end;Valve assembly is hinged structure, cooperate elastic reset piece, automatically rebound and cover when there is no grout pressure, realize the sealing of grouting hole.

2. The automatic closing and reverse stopping device for pipe jacking grouting hole according to claim 1, characterized in that, The connected end is provided with a screw structure for realizing the rotary sealing connection of the device body and the grouting pipeline.

3. The automatic closing and reverse stopping device for pipe jacking grouting hole according to claim 1, characterized in that, The grouting channel includes: The first end and the tail end of the main channel are connected to the connected end and the output end respectively; Multiple detours are distributed in a staggered manner and connected to the main channel, forming a folded flow channel with multiple turning points;The folded flow channel is arranged in a converging manner at each turning point in the direction from the connected end to the output end;In the direction from the output end to the connected end, it is arranged in a diverging manner at each turning point.

4. The automatic closing and reverse stopping device for pipe jacking grouting hole according to claim 1, characterized in that, The valve assembly includes: Four groups of valves, the side edges of each group of valves are rotatably connected to the output end of the device body through a hinge connection structure, and the four groups of valves are evenly distributed along the circumferential direction of the output end of the device body, forming a circular sealing surface that fits the grouting hole.

5. The automatic closing and reverse stopping device for pipe jacking grouting hole according to claim 1, characterized in that, The elastic reset piece includes: Pre-embedded part, corresponding to embedded and fixed in the internal preset installation position of the device body, the pre-embedded part and the device body form a stable integrated structure; Pre-embedded seat, which is detachably fitted with the pre-embedded part; High-strength spring, one end of which is fixedly connected with the inner wall of the valve and the other end is connected with the pre-embedded seat.

6. The automatic closing and reverse stopping device for pipe jacking grouting hole according to claim 1, characterized in that, The grouting channel is even.

7. The automatic closing and reverse stopping device for pipe jacking grouting hole according to claim 1, characterized in that, The inner diameter of the main channel is larger than that of the detour channel.

8. The automatic closing and reverse stopping device for pipe jacking grouting hole according to claim 4, characterized in that, Each group of valves is a circular arc-shaped and concave plate structure towards the connected end of the device body.

9. A method of grouting using the automatic closing reverse-stopping device of the pipe jacking grouting hole according to any one of claims 1 to 8, characterized in that, The steps include: According to the grouting amount requirement of pipe jacking construction, the pipe jacking pipe length and the uniformity requirement of grouting, combined with the permeability of stratum soil, determine the number and path planning of grouting pipeline;Each grouting pipeline is equipped with an automatic closing and reverse flow stopping device, the connected end of the device body is sealed and connected with the grouting pipeline through the screw structure, and the output end is aligned and attached with the preset grouting hole of the pipe jacking; Start the grouting pump, pressurize the lubricating grout and enter the device body, the grout flows along the folded flow channel formed by the main channel and the detour channel in the positive direction, opens the valve assembly at the output end under pressure, and makes the four groups of valves rotate outward and open around the hinge connection structure, and grouting is injected; After grouting is completed, the grouting pump and the grouting pipeline valve are closed, the high-strength spring in the elastic reset piece releases the reset tension, drives the four groups of valves to gather towards the center synchronously, automatically rebounds and covers to form a circular sealing surface, seals the grouting hole;At the same time, the folded flow channel of the grouting channel inhibits the reverse flow of grout through the converging-diverging structure, realizes the reverse flow stopping function.

Images