Water stop device for pipe jacking

Abstract

The utility model discloses a water stop device for pipe jacking, the structure mainly comprises a steel ring plate, a water stop ring, a steel compression ring, a fixed ring pipe and an elastic connecting piece, the water stop ring is clamped between the steel ring plate and the steel compression ring, the two ends of the elastic connecting piece are respectively and elastically connected with the water stop ring and the fixed ring pipe arranged in a drill hole, and the elastic connecting piece is connected with the steel compression ring. The elastic connecting piece generates pulling acting force on the water stop ring, so that the water stop ring is bent, the mutual extrusion acting force between the jacking pipe and the water stop ring is reduced, the mutual friction effect between the jacking pipe and the water stop ring is reduced, friction borne by the water stop ring is reduced, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of pipe jacking water stopping, in particular to a water stopping device for pipe jacking. Background Art

[0002] When carrying out the construction of municipal water conservancy projects, if it is necessary to install drainage pipes in sensitive areas such as highways, rivers or underground pipelines, in order to avoid damaging the ground and thus affecting ground traffic and causing damage to the surrounding environment, jacking technology is usually used for construction. When carrying out jacking construction, a working well will be dug at the starting end of the borehole, and then drilling and other operations will be carried out in the working well. A drilling rig is required to guide the drilling, and then one end of the jacking pipe is connected to a thruster. The jacking pipe is gradually pushed into the borehole by the thruster, and a sealing device is set at the starting mouth of the borehole to prevent thixotropic mud and mud from overflowing from the starting mouth of the borehole.

[0003] In the prior art, the sealing device is usually composed of an embedded steel ring plate, a rubber water stop ring and a steel pressure ring. The embedded steel ring plate is arranged on the wall of the drilled hole, and the rubber water stop ring is clamped between the embedded steel ring plate and the steel pressure ring. The rubber water stop ring is pressed against the outer wall of the jacking pipe to seal the starting hole of the drilled hole. However, since the rubber water stop ring is always in a pressed state with the outer wall of the jacking pipe, friction occurs between the rubber water stop ring and the jacking pipe. If the friction force is large or the time is long, the service life of the rubber water stop ring will be reduced, thereby reducing the water stopping effect, and further affecting the stable progress of the jacking pipe construction.

[0004] Therefore, there is an urgent need for a water-stopping device that can reduce the friction between the jacking pipe and the water-stopping device while stopping water during jacking pipe construction, thereby increasing the service life. Utility Model Content

[0005] The utility model aims to provide a water-stopping device for a jacking pipe, which is used to improve the technical problem of a short service life of the water-stopping device caused by friction between the jacking pipe and the water-stopping device.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A water-stop device for a jacking pipe comprises a steel ring plate, a water-stop ring and a steel pressure ring, wherein the steel ring plate is arranged on the wall of a drilled hole, and the water-stop ring is clamped between the steel ring plate and the steel pressure ring. The invention is characterized in that it also comprises a fixed ring tube and an elastic connecting piece, wherein the fixed ring tube is coaxially arranged in the drilled hole, a gap is provided between the inner wall of the fixed ring tube and the outer wall of the jacking pipe, and two ends of the elastic connecting piece are respectively connected to the water-stop ring and the fixed ring tube.

[0008] Among them, the water stop ring and the fixed ring pipe arranged in the drill hole are elastically connected through an elastic connecting piece. The elastic connecting piece generates a pulling force on the water stop ring, causing the water stop ring to bend, thereby reducing the mutual squeezing force between the top pipe and the water stop ring, thereby reducing the mutual friction between the top pipe and the water stop ring, reducing the friction on the water stop ring, and thus improving the service life.

[0009] In some embodiments, a plurality of connection blocks are sequentially spaced apart in the circumferential direction of the inner wall of the fixed ring tube, the elastic connection member includes a plurality of sub-connections, and the plurality of connection blocks are respectively connected to the water stop ring through the plurality of sub-connections.

[0010] In some embodiments, a pressure relief pipe is also included, which passes through the connecting block, the pipe body of the fixed ring pipe and the wall of the drilled hole, and two pipe openings of the pressure relief pipe are respectively arranged on the upper side of the connecting block and the hole opening of the drilled hole.

[0011] In some embodiments, a collecting piece is further included, and the collecting piece is connected to the pressure relief pipe.

[0012] In some embodiments, the pressure relief pipe is provided with a filter element, and the filter element is arranged in the pressure relief pipe and close to the connecting block.

[0013] In some embodiments, a plurality of guide members are sequentially arranged on the inner wall of the fixed ring tube in the axial and circumferential directions, and the plurality of guide members are all against the outer wall of the top tube.

[0014] In some embodiments, the guide member includes a guide block and an elastic buffer member, the guide block is arranged on the inner wall of the fixed ring tube, and the elastic buffer member is arranged at an end of the guide block away from the fixed ring tube.

[0015] Compared with the prior art, the advantages of the utility model are:

[0016] In the utility model, the water stop ring and the fixed ring pipe arranged in the drill hole are elastically connected by an elastic connecting piece. The elastic connecting piece generates a pulling force on the water stop ring, causing the water stop ring to bend, thereby reducing the mutual squeezing force between the top pipe and the water stop ring, thereby reducing the mutual friction between the top pipe and the water stop ring, reducing the friction suffered by the water stop ring, and thus improving the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1A schematic cross-sectional view of a water-stopping device for a jacking pipe according to an embodiment of the present application abutting against the jacking pipe;

[0019] Figure 2 This is a schematic diagram of the connection between a steel ring plate, a water stop ring and a steel pressure ring of a water stop device for a jacking pipe in an embodiment of the present application;

[0020] Figure 3 This is a schematic diagram of the connection between a fixed ring pipe, a connecting block and a guide member of a water-stopping device for a jacking pipe according to an embodiment of the present application;

[0021] Figure 4 A schematic diagram of a fixed ring pipe of a water-stopping device for pipe jacking according to an embodiment of the present application;

[0022] Figure 5 For the embodiments of this application Figure 1 An enlarged schematic diagram of the part marked A;

[0023] Figure 6 For the embodiments of this application Figure 1 An enlarged schematic diagram of the part marked with B;

[0024] Reference numerals:

[0025] 100-Steel Ring Plate,

[0026] 200-Water stop ring,

[0027] 300-Steel Press Ring,

[0028] 400-fixed ring pipe, 410-connection block,

[0029] 500-Drilling,

[0030] 600-Top pipe,

[0031] 700-elastic connector, 710-sub-connector,

[0032] 800-pressure relief pipe, 810-filter, 820-switch valve,

[0033] 900 - Collection Pieces,

[0034] 1000-guide member, 1100-guide block, 1200-elastic buffer member, 1210-buffer plate, 1220-buffer spring. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of 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.

[0036] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0037] In the description of the present utility model, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the utility model product is usually placed when used. It is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model.

[0038] In addition, the terms “first”, “second”, “third”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0039] In addition, the terms "horizontal", "vertical", "overhanging", etc. do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0040] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", "connection", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0042] It should be understood that in the prior art, during pipe jacking construction, sealing devices are usually used at the starting ends of the pipe jacking and the borehole to seal and stop water, thereby preventing the trigger cement and mud in the borehole from overflowing into the working well, resulting in the inability to construct normally. The sealing device is usually composed of a pre-buried steel ring plate, a rubber water stop ring and a steel pressure ring. The rubber water stop ring is against the outer wall of the pipe jacking, thereby forming a relatively sealed space between the rubber water stop ring and the outer wall of the pipe jacking, so that the trigger cement and mud in the borehole cannot overflow. Since the rubber water stop ring is always in a tight state with the outer wall of the pipe jacking, there is a large friction between the rubber water stop ring and the pipe jacking. If the friction force is large or the time is long, the rubber water stop ring will be damaged, thereby reducing the service life of the rubber water stop ring, thereby reducing the water stopping effect, and affecting the stable progress of the pipe jacking construction.

[0043] In order to improve the above problems, the present embodiment provides a water-stopping device for a jacking pipe 600, comprising a steel ring plate 100, a water-stopping ring 200 and a steel pressure ring 300. When the jacking pipe 600 is constructed, the water-stopping device is used to seal and water-stop the starting end of the borehole 500, while reducing the friction between the jacking pipe 600 and the water-stopping ring 200, thereby increasing the service life of the water-stopping device.

[0044] In this embodiment, Figure 1 and Figure 2 As shown, the steel ring plate 100 is arranged on the outer wall at the hole opening of the borehole 500 and is coaxially arranged with the borehole 500. Specifically, the steel ring plate 100 is embedded in the outer wall of the hole opening of the borehole 500, and the water stop ring 200 is clamped between the steel ring plate 100 and the steel pressure ring 300. In addition, the steel ring plate 100, the water stop ring 200 and the steel pressure ring 300 are connected by bolts, and the bolt connection points are arranged in sequence at intervals along the circumference of the steel ring plate 100, so as to ensure the stable connection between the steel ring plate 100, the water stop ring 200 and the steel pressure ring 300. After installation and fixation, the contact surface between the embedded steel ring plate 300 and the wall (concrete wall) of the borehole 500 is sealed with cement mortar to stop water.

[0045] Since the use of the steel pressure ring 300, the water stop ring 200 and the steel pressure ring 300 as a sealing device is prior art, they are not described in detail in this embodiment.

[0046] In this embodiment, Figure 1 and Figure 2As shown, the fixed ring tube 400 is arranged in the borehole 500, and the fixed ring tube 400 is coaxially arranged with the steel ring plate 100. Specifically, one end of the fixed ring tube 400 is connected to the side of the steel ring plate 100 away from the water stop ring 200. When the top pipe 600 passes through the fixed ring tube 400, there is a gap between the top pipe 600 and the fixed ring tube 400, thereby ensuring that no friction occurs between the top pipe 600 and the fixed ring tube 400. In addition, the setting of the fixed ring tube 400 provides a certain supporting force for the hole of the borehole 500, so that the structure such as the soil layer at the hole of the borehole 500 is stable and not prone to collapse, deformation and the like.

[0047] like Figure 1 and Figure 4 As shown, a plurality of connecting blocks 410 are provided on the inner wall of the fixed ring tube 400. Specifically, the plurality of connecting blocks 410 are arranged in sequence and spaced apart along the circumference of the fixed ring tube 400. There are gaps between the plurality of connecting blocks 410 and the inner wall of the top tube 600, and the gap between the connecting blocks 410 and the outer wall of the top tube 600 is smaller than the gap between the fixed ring tube 400 and the outer wall of the top tube 600.

[0048] Among them, Figure 1 As shown, the elastic connector 700 includes a plurality of sub-connectors 710, one ends of the plurality of sub-connectors 710 are respectively connected to the plurality of connection blocks 410, the other ends of the plurality of sub-connectors 710 are connected to a side of the water stop ring 200 away from the steel pressure ring 300, and the plurality of sub-connectors 710 are connected to one end of the water stop ring 200 close to the top pipe 600. Specifically, the sub-connectors 710 may adopt connecting springs, rubber ropes and other components. In this embodiment, the sub-connectors 710 adopt connecting springs.

[0049] It should be understood that when the top pipe 600 enters the borehole 500, the top pipe 600 squeezes the bottom end of the water stop ring 200, the water stop ring 200 bends, and the bent bottom end of the water stop ring 200 is against the outer wall of the top pipe 600 due to its own bending stress and other reasons, thereby causing the water stop ring 200 to exert a greater pressure on the outer wall of the top pipe 600. Therefore, when the top pipe 600 continues to enter the borehole 500, friction occurs between the outer wall of the top pipe 600 and the water stop ring 200, and the magnitude of the friction force is affected by the magnitude of the pressure exerted by the water stop ring 200 on the top pipe 600.

[0050] The water stop ring 200 is damaged due to the long-term friction of the top pipe 600, thereby reducing the life of the water stop ring 200. Moreover, the greater the friction force on the water stop ring 200, the lower the service life.

[0051] Therefore, in this embodiment, if Figure 1As shown, when the connecting block 410 is connected to the water stop ring 200, the sub-connector 710 is in an extended state, wherein, since the water stop ring 200 is made of rubber material and the sub-connector 710 is in an extended state, the sub-connector 710 will pull the bottom end of the water stop ring 200 to bend, thereby causing an angle between the bottom end of the water stop ring 200 and the vertical direction. At this time, when the top pipe 600 enters the borehole 500, the outer wall of the top pipe 600 abuts against the bottom end of the water stop ring 200. Since the water stop ring 200 is pulled by the sub-connector 710 and then bent, the force acting on the water stop ring 200 due to the squeezing of the top pipe 600 by the top pipe 600 is reduced, thereby reducing the pressure between the water stop ring 200 and the top pipe 600, thereby reducing the friction between the water stop ring 200 and the top pipe 600, thereby increasing the service life of the water stop ring 200.

[0052] Among them, the force of the spring used in the sub-connector 710 can be selected according to the degree to which the sub-connector 710 needs to pull the water stop ring 200 to bend, that is, while keeping the water stop ring 200 against the outer wall of the top pipe 600, the force between the water stop ring 200 and the outer wall of the top pipe 600 is low.

[0053] At the same time, when the jacking pipe 600 enters the borehole 500, due to the triggering of cement and mud squeezing, the water stop ring 200 is prone to change its bending direction from toward the inside of the borehole 500 to toward the opening of the borehole 500, which in turn causes the water stop ring 200 to be everted, making it impossible to perform water stopping operation or the water stopping effect is low. In this embodiment, the sub-connector 710 is connected to the water stop ring 200. When the cement and mud are triggered to squeeze the water stop ring 200, the sub-connector 710 has an opposite force on the water stop ring 200 as the triggering cement and mud on the water stop ring 200, thereby making it difficult for the water stop ring 200 to be everted, thereby improving the water stopping effect of the water stop ring 200.

[0054] In some embodiments, Figure 1 and Figure 6 As shown, the water-stopping device also includes a pressure relief pipe 800, which is arranged on the connecting block 410, the pipe body of the fixed ring pipe 400 and the wall of the borehole 500. Specifically, the inlet and outlet of the pressure relief pipe 800 are respectively arranged on the connecting block 410 and the wall of the borehole 500. When the drilling rig just starts to drill the hole 500, if the pressure in the borehole 500 is relatively large, part of the pressure in the borehole 500 can be released through the pressure relief pipe, thereby avoiding the phenomenon of reverse thrust of the drilling rig.

[0055] At the same time, the outlet of the pressure relief pipe 800 is arranged on the wall of the borehole 500, and at the upper end of the wall, so that objects such as triggered cement and mud are affected by their own gravity when passing through the pressure relief pipe 800, so that the speed is slower, thereby avoiding excessive outflow of triggered cement and mud from the pressure relief pipe 800, thereby affecting normal construction.

[0056] In some embodiments, Figure 1 and Figure 6 As shown, the water-stopping device further includes a collecting member 900. The collecting member 900 may be in a polygonal structure such as a cylinder or a rectangle. In the present embodiment, the collecting member 900 is in a cylindrical shape.

[0057] The collecting piece 900 is connected to the pressure relief pipe 800 through a pipe. When the mud and trigger cement in the borehole 500 flow out through the pressure relief pipe, they can be recycled through the collecting piece 900, thereby saving costs. A conveying pump is provided between the collecting piece 900 and the pressure relief pipe 800, which is used to convey the trigger cement and mud in the pressure relief pipe 800 into the collecting piece 900.

[0058] Among them, the pressure relief pipe 800 has a switch valve 820, which is used to control the opening and closing of the pressure relief pipe 800, so that the pressure relief pipe 800 is opened and closed within a fixed time, avoiding the pressure relief pipe 800 being always open, which causes a large amount of cement and mud to flow out, thereby affecting the smooth implementation of the jacking pipe 600 construction.

[0059] In some embodiments, Figure 1 and Figure 6 As shown, a filter element 810 is provided in the pressure relief pipe 800, wherein the filter element 810 is arranged in the pressure relief pipe 800 and is arranged close to the connecting block 410. The filter element 810 can adopt a filter net, a filter grate and other structures. In this embodiment, the filter element 810 adopts a filter grate, and the filter aperture of the filter grate is not greater than 50 mm, so that some larger particles such as gravel, mud and sand in the borehole 500 cannot pass through the pressure relief pipe 800, thereby preventing larger particles such as gravel, mud and sand from generating a large impact under the action of pressure, thereby causing damage to the equipment or pipeline.

[0060] At the same time, it can also block the triggering cement and mud, thereby reducing the flow rate of the triggering cement and mud, and avoiding excessive overflow of the triggering cement and mud sand.

[0061] In some embodiments, Figure 1 , Figure 3 and Figure 5 As shown, a plurality of guide members 1000 are disposed on the inner wall of the fixed ring tube 400 . Specifically, the guide members 1000 are sequentially spaced along the circumferential direction and radial direction of the inner wall of the fixed ring tube 400 .

[0062] Among them, the guide member 1000 includes a guide block 1100 and an elastic buffer member 1200, and the guide block 1100 is arranged in sequence along the circumference and circumferential direction of the fixed ring tube 400. The guide block 1100 is arranged at one end of the tube body of the fixed ring tube 400, and is arranged away from the connecting block 410 and the sub-connector 710. Among them, an elastic buffer member 1200 is provided at one end of the guide block 1100 away from the tube body of the fixed ring tube 400, and the elastic buffer member 1200 includes a buffer plate 1210 and a buffer spring 1220, and the buffer plate 1210 and the guide block 1100 are connected by the buffer spring 1220.

[0063] Among them, the guide block 1100 can adopt a rectangular body, a cylindrical body or other structures. In this embodiment, the guide block 1100 adopts a rectangular body, and the guide block 1100 is adapted to the inner wall of the fixed ring tube 400. The shape of the buffer plate 1210 is adapted to the guide block 1100, and the side facing the top pipe 600 is adapted to the top pipe 600, so that the buffer plate 1210 can be against the top pipe 600.

[0064] There are multiple buffer springs 1220. In the present embodiment, there are four buffer springs 1220. The four buffer springs 1220 are respectively arranged between the guide block 1100 and the buffer plate 1210, and the four buffer springs 1220 are respectively arranged at the four corners of the guide block 1100. When the top pipe 600 enters the bore hole 500, the buffer plate 1210 abuts against the outer wall of the top pipe 600, thereby stabilizing the position of the top pipe 600. At the same time, the buffer springs 1220 can also reduce the effects of vibration and other forces on the guide member 1000 when the top pipe 600 enters the bore hole 500, thereby preventing the guide member 1000 from being damaged by the large force of the top pipe 600.

[0065] The design of the buffer spring 1220 enables the guide member 1000 to be suitable for manufacturing errors such as undulations or grooves at different positions on the surface of the top pipe 600.

[0066] The plurality of guide members 1000 and the plurality of connection blocks 410 are arranged at staggered intervals along the circumference of the tube body of the fixed ring tube 400 , thereby partially blocking the triggering cement and silt, thereby preventing the water stop ring 200 from being subjected to a large force.

Claims

1. A water-stop device for a jacking pipe, comprising a steel ring plate (100), a water-stop ring (200) and a plurality of steel pressure rings (300), wherein the steel ring plate (100) is arranged on the wall of a borehole (500), and the water-stop ring (200) is sandwiched between the steel ring plate (100) and the steel pressure ring (300), characterized in that: Also includes: A fixed ring tube (400) is coaxially arranged in the borehole (500), and a gap is provided between the inner wall of the fixed ring tube (400) and the outer wall of the top tube (600); and An elastic connecting member (700) has two ends respectively connected to the water stop ring (200) and the fixed ring tube (400).

2. The water stopping device for pipe jacking according to claim 1, characterized in that: A plurality of connection blocks (410) are sequentially spaced apart in the circumferential direction of the inner wall of the fixed ring tube (400); the elastic connection member (700) comprises a plurality of sub-connection members (710); and the plurality of connection blocks (410) are respectively connected to the water stop ring (200) via the plurality of sub-connection members (710).

3. The water stopping device for pipe jacking according to claim 2, characterized in that: It also includes a pressure relief pipe (800), the pressure relief pipe (800) passing through the connecting block (410), the pipe body of the fixed ring pipe (400) and the wall of the borehole (500), and the two pipe openings of the pressure relief pipe (800) are respectively arranged on the upper sides of the openings of the connecting block (410) and the borehole (500).

4. The water stopping device for pipe jacking according to claim 3, characterized in that: It also includes a collecting piece (900), wherein the collecting piece (900) is in communication with the pressure relief pipe (800).

5. The water stopping device for pipe jacking according to claim 3, characterized in that: The pressure relief pipe (800) is provided with a filter element (810), and the filter element (810) is arranged in the pressure relief pipe (800) and close to the connection block (410).

6. The water stopping device for pipe jacking according to claim 1, characterized in that: The inner wall of the fixed ring tube (400) is provided with a plurality of guide members (1000) in sequence and at intervals along the axial direction and the circumferential direction, and the plurality of guide members (1000) are all in contact with the outer wall of the top tube (600).

7. The water stopping device for pipe jacking according to claim 6, characterized in that: The guide member (1000) comprises a guide block (1100) and an elastic buffer member (1200); the guide block (1100) is arranged on the inner wall of the fixed ring tube (400); and the elastic buffer member (1200) is arranged at an end of the guide block (1100) that faces away from the fixed ring tube (400).

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