Slurry pipeline extending device for slurry shield construction

Abstract

The invention belongs to the technical field of shield construction, and particularly relates to a slurry pipeline extension device for slurry shield construction, which comprises an extension assembly, a driving assembly, a flange kit and an oil cup, the extension assembly is used for allowing slurry to pass through; the extension assembly comprises an outer pipe and an inner pipe; the driving assembly is used for driving the extension assembly to do telescopic motion; the flange kit is used for sealing the crack; the flange kit is arranged at the grease smearing end, and a sealing cavity is formed between the flange kit and the inner pipe; an oil coating piece and an auxiliary material are arranged in the sealing cavity; the oil cup is used for adding lubricating oil into the crack; wherein the oil coating piece is a graphite packing, and the auxiliary material is a polytetrafluoroethylene packing; the at least one polytetrafluoroethylene packing is closer to the slurry permeation end than the graphite packing; when the inner pipe slides relative to the outer pipe, the graphite packing smears grease on the outer side wall of the inner pipe, the graphite packing absorbs and fixes lubricating oil through holes formed by weaving of the graphite packing, and the grease can still be continuously released after an oil film is damaged by muddy water, so that the oil supplementing period is prolonged, and the oil consumption is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of shield construction, and in particular relates to a mud pipeline extension device used for mud-water shield construction. Background Art

[0002] As a commonly used excavation mechanism in tunnel engineering, the slurry shield machine has the advantages of fast speed, high precision in controlling surface settlement, and little interference with the soil around the excavation surface. It is now widely used in excavation operations of tunnels with high water pressure, shallow overburden, and unstable strata. The slurry shield machine needs to cooperate with the mud pipeline to discharge slag. The mud pipeline includes the shield machine pipeline end and the tunnel pipeline end that are connected to each other. The shield machine pipeline end is installed on the shield machine and continues to move forward with the excavation operation of the shield machine. The tunnel pipeline end is installed on the inner wall of the tunnel segment and is fixed in position. When the shield machine is excavating, as the distance between the two pipeline ends continues to increase, a pipeline extension device needs to be inserted to ensure the normal discharge of mud. There are three main types of pipeline extension devices: piston-type mud pipe extension device, vertical hose extension mud pipe extension device, and horizontal hose extension mud pipe extension device. Among them, the piston-type mud pipe extension device includes a double straight pipe, which is connected by sliding between an outer pipe and an inner pipe to complete the forward pushing of the old mud pipeline and the plug-in connection of the new pipeline, thereby completing the extension construction of the entire mud pipeline.

[0003] In order to improve the sliding efficiency between the inner and outer tubes and reduce the wear of the tube wall, lubricating oil is usually added to the gap between the inner and outer tubes to form a lubricating oil film. However, muddy water can easily penetrate into the gap, destroy the oil film system and affect the lubrication effect, so it is necessary to constantly replenish the lubricating oil. In the prior art, the spraying method is used for replenishment. This method will spray a large amount of lubricating oil to cover the outer wall of the inner tube, and the amount of spraying often follows the principle of more rather than less, which results in a large amount of oil consumption and easily leads to a waste of resources. Summary of the invention

[0004] The purpose of the present invention is to provide a mud pipeline extension device for mud-water shield construction, aiming to solve the technical problem of large lubricating oil consumption of mud pipeline piston extension devices in the prior art.

[0005] To achieve the above-mentioned purpose, an embodiment of the present invention provides a mud pipeline extension device for mud-water shield construction, comprising an extension component, a drive component, a flange kit, and an oil cup; the extension component is used to allow mud to pass through; the extension component comprises an outer tube and an inner tube; one end of the inner tube is slidably plugged into the outer tube, and the other end of the inner tube extends out of the outer tube; a gap is provided between the outer tube and the inner tube, and the gap is provided with a mud infiltration end and a grease application end connected to each other; the drive component is used to drive the telescopic movement of the extension component; the two ends of the drive component are respectively fixedly connected to the outer tube and the inner tube; the flange kit is used to seal the gap; the flange The kit is arranged at the grease application end and a sealing cavity is provided between the kit and the inner tube; an oil-applying part and auxiliary materials are provided in the sealing cavity; the oil-applying part and the auxiliary materials are both in contact with the outer wall of the inner tube; the oil-applying part is used to absorb and apply lubricating oil, and the auxiliary materials are used to seal so that mud will not seep out; the oil cup is used to add lubricating oil to the gap; a connecting hole is provided on the outer wall of the flange kit that penetrates the sealing cavity, and the oil outlet of the oil cup passes through the connecting hole to extend into the sealing cavity; the oil cup is airtightly connected to the connecting hole, and the oil outlet is arranged beside the oil-applying part; wherein the oil-applying part is set as graphite packing, and the auxiliary materials are set as polytetrafluoroethylene packing; at least one polytetrafluoroethylene packing is closer to the mud infiltration end than the graphite packing.

[0006] Preferably, the flange kit includes a flange main ring and a flange mating ring; the inner side wall of the flange main ring is recessed with a limiting groove, one end of the limiting groove extends to the outer side wall of the flange main ring to form an opening; the first end of the flange mating ring is inserted into the limiting groove through the opening; the inner side wall of the limiting groove and the outer side wall of the first end of the flange mating ring are arranged to form a sealing cavity.

[0007] Preferably, the flange main ring is provided with a main ring connecting portion beside the opening, and the second end of the flange matching ring is provided with a matching ring connecting portion, and the main ring connecting portion and the matching ring connecting portion are fixedly connected by bolts and nuts.

[0008] Preferably, a plurality of spacer rings are arranged in the sealing cavity along the axial direction of the flange set at intervals; the spacer rings divide the sealing cavity into a plurality of packing areas in the axial direction, and the graphite packings and the polytetrafluoroethylene packings are placed in the plurality of packing areas in a one-to-one correspondence.

[0009] Preferably, a plurality of graphite packings and a plurality of polytetrafluoroethylene packings are provided, and the graphite packings and polytetrafluoroethylene packings are alternately arranged in a plurality of packing areas.

[0010] Preferably, a limiting member is provided in the sealing cavity, and the position of the limiting member corresponds to the connecting hole for fixing the oil outlet of the oil cup.

[0011] Preferably, the driving assembly comprises a guide structure; the guide structure is connected to the extension assembly to constrain the sliding direction and sliding distance of the inner tube.

[0012] Preferably, the guide rod structure is configured as a telescopic rod; the telescopic rod comprises an outer cylinder and an inner cylinder which are slidably connected to each other; one of the outer cylinder and the inner cylinder is fixedly connected to the outer tube, and the other of the outer cylinder and the inner cylinder is fixedly connected to the inner tube; the telescopic direction of the telescopic rod is parallel to the telescopic direction of the driving cylinder.

[0013] Preferably, there are two or more driving cylinders and guide structures; a plurality of driving cylinders and a plurality of guide structures are arranged equidistantly along the circumference of the extension component; and the driving cylinders and guide structures are arranged alternately.

[0014] Compared with the prior art, the above one or more technical solutions in the mud pipeline extension device for mud water shield construction provided by the embodiment of the present invention have at least one of the following technical effects: the lubricating oil in the oil cup enters the sealing cavity through the oil outlet and contacts with the graphite packing. When the inner tube slides relative to the outer tube, the graphite packing applies the grease to the outer wall of the inner tube; compared with the method of directly spraying the lubricating oil, the graphite packing absorbs and fixes the lubricating oil through the pores formed by its own weaving, and can continue to release the grease after the oil film is damaged by mud and water, so as to extend the oil replenishment cycle and reduce the oil consumption; in addition, the graphite packing can spread the lubricating oil on the outer wall of the inner tube, so that the lubricating oil adheres evenly, and has a better lubricating effect on the sliding of the inner tube; at least one polytetrafluoroethylene packing is provided on the side of the graphite packing close to the mud infiltration end, and the polytetrafluoroethylene packing blocks the mud and water from infiltrating the graphite packing through its own hydrophobic properties and weaving structure, so as to protect the newly formed oil film system of the graphite packing and reduce the loss and waste of lubricating oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is an axial cross-sectional view of the present invention.

[0016] Figure 2 It is a structural view of the gap of the present invention.

[0017] Figure 3 for Figure 1 Enlarged schematic diagram of circle A in the middle.

[0018] Figure 4 It is a radial cross-sectional view of the present invention.

[0019] Figure 5 A structural view of the oriented structure.

[0020] In the figure:

[0021] 1. Extension assembly; 11. Outer tube; 12. Inner tube; 121. Plug end; 122. Connecting end; 13. Crack; 131. Mud infiltration end; 132. Grease application end;

[0022] 2. Driving assembly; 21. Driving cylinder; 22. Guide structure; 221. Outer cylinder; 222. Inner cylinder;

[0023] 3. Flange kit; 31. Flange main ring; 311. Limiting groove; 312. Main ring connecting part; 32. Flange matching ring; 321. Matching ring connecting part; 33. Sealing cavity; 331. Spacer ring; 332. Packing area; 333. Oil-coated parts; 334. Auxiliary materials; 34. Connecting hole; 341. Oil cup; 342. Limiting parts. DETAILED DESCRIPTION

[0024] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0025] In the description of the embodiments of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0027] In the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0028] Embodiment 1

[0029] The present invention is a slurry pipeline extension device for slurry shield construction, referring to Figure 1 and Figure 2, installed in the mud pipeline of the mud-water shield construction, including an extension component 1 and a driving component 2; the extension component 1 is used to allow the mud to pass through, and includes an outer tube 11 and an inner tube 12, one end of the inner tube 12 is set as a plug-in end 121 and is slidably plugged and connected to the outer tube 11, and the other end of the inner tube 12 is used as a connecting end 122 to extend out of the outer tube 11; in the gap 13 between the inner tube 12 and the outer tube 11, the plug-in end 121 of the inner tube 12 is a mud infiltration end 131, and the mud can easily pass through the mud infiltration end 131 from the flow channel into the gap 13; in the gap 13, the connecting end 122 of the inner tube 12 is a grease application end 132, and grease is applied to the grease application end 132 Apply it on the outer wall of the inner tube 12; one end of the outer tube 11 close to the mud infiltration end 131, and the connecting end 122 of the inner tube 12 are respectively connected to the two mud pipeline connecting ports, so that the mud can flow through the extension component 1; the driving component 2 includes a driving cylinder 21 for driving the extension component 1 to move telescopically, the fixed end of the driving cylinder 21 is fixedly connected to the outer tube 11, and the output end of the driving cylinder 21 is fixedly connected to the connecting end 122 of the inner tube 12; the driving cylinder 21 converts hydraulic energy into mechanical energy to drive the relative sliding of the inner tube 12 and the outer tube 11. This structure is a prior art that can be directly obtained by technicians in this field and will not be described in detail here.

[0030] refer to Figure 1 and Figure 3A flange kit 3 is provided on the outer tube 11, and the flange kit 3 is used to seal the gap 13; the flange kit 3 is provided at the grease application end 132; a sealing cavity 33 is provided between the inner wall of the flange kit 3 and the outer wall of the inner tube 12, and an oil-applying part 333 and an auxiliary material 334 are arranged in the sealing cavity 33; the oil-applying part 333 is provided as a graphite packing, and the auxiliary material 334 is provided as a polytetrafluoroethylene packing; both the graphite packing and the polytetrafluoroethylene packing are in contact with the outer wall of the inner tube 12, the graphite packing is used to absorb the lubricating oil and apply the lubricating oil to the outer wall of the inner tube 12, and the polytetrafluoroethylene packing is used to block the mud to seal the gap 13; when the graphite packing and the polytetrafluoroethylene packing are provided as one or more, at least one polytetrafluoroethylene packing is closer to the mud infiltration end 131 than the graphite packing, so that the mud is not easy to seep out from the gap 13 to the graphite packing; the graphite packing is a sealing material woven by graphite wire, and is mostly used for sealing to prevent liquid leakage. Graphite wire has oleophilic properties and can achieve lubrication by adsorbing and fixing grease molecules. Its lubrication effect can be enhanced by adding alkyl sulfonic acid or molybdenum disulfide. However, in the prior art, the lubrication properties of graphite packing are only convenient for use as dynamic sealing materials to seal the relative sliding of two adjacent structures, and have not been used in research on optimizing lubricant consumption. In addition, PTFE packing woven from pure PTFE fiber, a hydrophobic material, has a good barrier effect on liquids and is also mostly used as a sealing material, which can be used as a reference. The present invention conducts the following comparative test on the lubricating oil consumption of the outer wall of the inner tube 12: the initial addition amount and type of lubricating oil, the length of the mud infiltration end 131, the residence time of mud water in the extension component 1, and the substances and concentrations of mud water are controlled to remain unchanged; in experiment 1, the oil coating part 333 is not used, but the lubricating oil is directly sprayed at the oil outlet; in experiment 2, polytetrafluoroethylene packing is used as the oil coating part 333; and in experiment 3, graphite packing is used as the oil coating part 333; by detecting the same detection point with an oil film thickness meter, it is found that the lubricating oil consumption is experiment 1>experiment 2>experiment 3; by detecting multiple detection points with an oil film thickness meter, it is found that the coating uniformity of the outer wall of the inner tube 12 is experiment 3>experiment 2>experiment 1; that is, by using graphite packing as the oil coating part 333, compared with the method of directly spraying lubricating oil at the oil outlet, a more uniform oil film can be formed on the outer wall of the inner tube 12, and a lower oil consumption can be consumed. The graphite packing can be set as high-pressure flexible expanded graphite packing; with PTFE packing as auxiliary material 334, mud is not easy to pass through the pores of PTFE packing or be absorbed and penetrate into the graphite packing, so that the newly formed oil film system at the grease coating end is not easily destroyed by mud and water. In addition, PTFE packing can assist the graphite packing to evenly apply the lubricating oil to facilitate the sliding of the inner tube.

[0031] refer to Figure 3The outer wall of the flange set 3 is provided with a connecting hole 34 that penetrates into the sealing cavity 33, and the oil outlet of the oil cup 341 passes through the connecting hole 34 to extend into the sealing cavity 33; the oil cup 341 is tightly connected to the connecting hole 34 by bolts, snap fasteners, welding or other connection methods, so that the lubricating oil is not easy to leak out; the oil outlet of the oil cup 341 is arranged beside the graphite packing, so that the lubricating oil can be absorbed by the graphite packing after flowing out from the oil outlet.

[0032] Embodiment 2

[0033] Compared with the first embodiment, the difference is: Figure 3 The flange kit 3 includes a flange main ring 31 and a flange matching ring 32; the inner side wall of the flange main ring 31 is recessed with a limiting groove 311, and one end of the limiting groove 311 extends to the outer side wall of the flange main ring 31 to form an opening; the first end of the flange matching ring 32 passes through the opening and is inserted into the limiting groove 311; the inner side wall of the limiting groove 311 and the outer side wall of the first end of the flange matching ring 32 are surrounded to form the sealing cavity 33; the flange main ring 31 is provided with a main ring connecting portion 312 beside the opening, and the second end of the flange matching ring 32 is provided with a matching ring connecting portion 321, and the main ring connecting portion 312 and the matching ring connecting portion 321 are fixedly connected by bolts and nuts; tightening the bolts can reduce the distance between the flange matching ring 32 and the flange main ring 31, reduce the width of the sealing cavity 33, and compress the graphite packing and the polytetrafluoroethylene packing, so that the graphite packing and the polytetrafluoroethylene packing are not easy to loosen and fall off.

[0034] Embodiment 3

[0035] Compared with the first embodiment, the difference is: Figure 3 A plurality of spacer rings 331 are arranged in the sealing cavity 33 along the axial direction of the flange set 3; the spacer rings 331 divide the sealing cavity 33 into a plurality of packing areas 332 in the axial direction, and the graphite packings and the polytetrafluoroethylene packings are placed in the plurality of packing areas 332 in a one-to-one correspondence; the spacer rings 331 are used to limit the graphite packings and the polytetrafluoroethylene packings. When the flange matching ring 32 is pressed against the flange main ring 31, the spacer rings 331 can squeeze the graphite packings and the polytetrafluoroethylene packings to reduce the gap in the packing area 332, so that the mud is not easy to penetrate through the gap and penetrate into the sealing cavity 33. There are a plurality of graphite packings and polytetrafluoroethylene packings, which are staggered in the packing areas 332, i.e., a polytetrafluoroethylene packing is provided next to each graphite packing, and a graphite packing is provided next to each polytetrafluoroethylene packing. The graphite packings cooperate with each other to apply lubricating oil to the outer wall of the inner tube 12. At the same time, the mud in the gap 13 is blocked by the polytetrafluoroethylene packings layer by layer and is not easy to penetrate into the graphite packings.

[0036] A limiting member 342 is disposed in the sealing cavity 33 , and the position of the limiting member 342 corresponds to the connecting hole 34 for fixing the oil outlet of the oil cup 341 ; the limiting member 342 can be configured as a clamping ring or buckle structure sleeved on the outer wall of the oil cup 341 .

[0037] Embodiment 4

[0038] Compared with the first embodiment, the difference is: Figure 2 and Figure 5 The driving component 2 includes a guide structure 22, which is connected to the extension component 1 to constrain the sliding direction and sliding distance of the inner tube 12; the guide rod structure is set as a telescopic rod, including an outer cylinder 221 and an inner cylinder 222 that are slidably connected to each other; one of the outer cylinder 221 and the inner cylinder 222 is fixedly connected to the outer tube 11, and the other of the outer cylinder 221 and the inner cylinder 222 is fixedly connected to the connecting end 122 of the inner tube 12; the telescopic direction of the telescopic rod is parallel to the telescopic direction of the driving cylinder 21.

[0039] refer to Figure 4 , two or more driving cylinders 21 and guide structures 22 can be provided; a plurality of driving cylinders 21 are arranged equidistantly along the circumference of the extension component 1, and a plurality of guide structures 22 are arranged equidistantly along the circumference of the extension component 1, so that the extension component 1 is not easy to slip during telescopic movement; the driving cylinders 21 and the guide structures 22 are arranged alternately; for example: when two driving cylinders 21 and two guide structures 22 are provided, the two driving cylinders 21 are symmetrically arranged at the top and bottom of the extension component 1, respectively, and the two guide structures 22 are symmetrically arranged at the left and right sides of the extension component 1, respectively, so that the telescopic movement of the extension component 1 is more stable.

[0040] The rest of this embodiment is the same as the first embodiment. The features not explained in this embodiment are all based on the explanations in the first embodiment and will not be described in detail here.

[0041] The above content is a further detailed description of the present invention in combination with specific preferred implementation methods, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, without departing from the concept of the present invention, its architecture can be flexible and can derive a series of products. Just making a few simple deductions or substitutions should be regarded as belonging to the scope of patent protection of the present invention determined by the submitted claims.

Claims

1. A slurry pipeline extension device for slurry shield construction, characterized in that: include: An extension assembly is used to allow mud to pass through; the extension assembly includes an outer tube and an inner tube; one end of the inner tube is slidably plugged with the outer tube, and the other end of the inner tube extends out of the outer tube; a gap is provided between the outer tube and the inner tube, and the gap is provided with a mud infiltration end and a grease application end connected to each other; the mud infiltration end is connected to a mud flow channel; A driving assembly, used to drive the telescopic movement of the extension assembly; two ends of the driving assembly are fixedly connected to the outer tube and the inner tube respectively; A flange kit is used to seal the gap; the flange kit is arranged at the grease application end and a sealing cavity is arranged between the inner tube; an oiling piece and auxiliary materials are arranged in the sealing cavity; the oiling piece and the auxiliary materials are both in contact with the outer wall of the inner tube; the oiling piece is used to absorb and apply lubricating oil, and the auxiliary materials are used to block mud; and An oil cup is used to add lubricating oil to the gap; the outer wall of the flange set is provided with a connecting hole penetrating to the sealing cavity, and the oil outlet of the oil cup passes through the connecting hole to extend into the sealing cavity; the oil cup is tightly connected to the connecting hole, and the oil outlet is arranged beside the oiling member; Wherein, the oil-coated part is a graphite packing, and the auxiliary material is a polytetrafluoroethylene packing; at least one of the polytetrafluoroethylene packings is closer to the mud infiltration end than the graphite packing.

2. The slurry pipeline extension device for slurry shield construction according to claim 1 is characterized in that: The flange kit includes a flange main ring and a flange mating ring; a limiting groove is recessed on the inner side wall of the flange main ring, and one end of the limiting groove extends to the outer side wall of the flange main ring to form an opening; the first end of the flange mating ring passes through the opening and is inserted into the limiting groove; the inner side wall of the limiting groove and the outer side wall of the first end of the flange mating ring are arranged to form the sealing cavity.

3. The slurry pipeline extension device for slurry shield construction according to claim 2 is characterized in that: The flange main ring is provided with a main ring connecting portion beside the opening, and the second end of the flange matching ring is provided with a matching ring connecting portion, and the main ring connecting portion and the matching ring connecting portion are fixedly connected by bolts and nuts.

4. The slurry pipeline extension device for slurry shield construction according to claim 1 is characterized in that: A plurality of spacer rings are arranged in the sealing cavity along the axial direction of the flange set at intervals; the spacer rings divide the sealing cavity into a plurality of packing areas in the axial direction, and the graphite packings and the polytetrafluoroethylene packings are placed in the plurality of packing areas in a one-to-one correspondence.

5. The slurry pipeline extension device for slurry shield construction according to claim 4 is characterized in that: A plurality of the graphite packings and the polytetrafluoroethylene packings are provided, and the graphite packings and the polytetrafluoroethylene packings are arranged alternately in a plurality of the packing areas.

6. The slurry pipeline extension device for slurry shield construction according to claim 1 is characterized in that: A limiting member is provided in the sealing cavity, and the position of the limiting member corresponds to the connecting hole so as to fix the oil outlet of the oil cup.

7. The slurry pipeline extension device for slurry shield construction according to claim 1 is characterized in that: The driving assembly includes a guide structure; the guide structure is connected to the extension assembly to constrain the sliding direction and sliding distance of the inner tube.

8. The slurry pipeline extension device for slurry shield construction according to claim 7 is characterized in that: The guide rod structure is configured as a telescopic rod; the telescopic rod comprises an outer cylinder and an inner cylinder which are slidably connected to each other; one of the outer cylinder and the inner cylinder is fixedly connected to the outer tube, and the other of the outer cylinder and the inner cylinder is fixedly connected to the inner tube; the telescopic direction of the telescopic rod is parallel to the telescopic direction of the driving cylinder.

9. The slurry pipeline extension device for slurry shield construction according to claim 1 is characterized in that: There are two or more driving cylinders and guide structures; a plurality of the driving cylinders and a plurality of the guide structures are arranged equidistantly along the circumference of the extension component; the driving cylinders and the guide structures are arranged alternately.

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