Resistance reduction device for tube push bench adopting first-well and second-tube method

Abstract

The utility model discloses a resistance reduction device for a tube push bench in a well-first and tube-second method, which solves the problem that the frictional resistance is increased when the tube push bench passes through an inspection well in the prior art. The resistance reduction device of the tube push bench in the first-well and second-tube method comprises a supporting seat, at least one roll shaft assembly is arranged on the supporting seat, each roll shaft assembly comprises a horizontally-arranged bottom roll shaft and two symmetrically-arranged side roll shafts, and the side roll shafts and the bottom roll shaft form an arc-shaped roll shaft set or a U-shaped roll shaft set. According to the utility model, through the arc-shaped roll shaft group or the U-shaped roll shaft group formed by the side roll shafts and the bottom roll shaft, the resistance when the jacking pipe passes through the inspection well is reduced, and meanwhile, the pipe jacking machine can accurately pass through the reserved hole. According to the utility model, the bottom rolling shaft and the side rolling shafts are combined, so that the jacking resistance can be reduced while the pipe jacking machine is twisted, and the pipe jacking construction efficiency is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pipe jacking construction, in particular to a resistance reducing device for a pipe jacking machine using the well-first-then-pipe method. Background Art

[0002] The municipal pipelines in the core section of the city were built earlier, and various municipal pipelines in the shallow underground space are approaching the period of comprehensive renewal. In recent years, accidents such as urban waterlogging, pipeline bursting, and road collapse caused by pipeline corrosion and aging have occurred frequently. The supply-side demand for direct buried pipelines to make up for shortcomings is becoming increasingly urgent. At the same time, with the increasing attention paid to traffic requirements and green environmental protection concepts, the open excavation method is no longer suitable for the current situation in the city. Pipe jacking construction has gradually become the mainstream technology for urban underground pipelines. Pipe jacking construction can effectively avoid conflicts with existing upper pipelines due to its flexible cross-section selection and large burial depth. It only needs to set up corresponding working wells, receiving wells, intermediate inspection wells, etc. in a small area, which can meet the needs of long-distance underground pipeline construction.

[0003] In the construction of municipal pipelines, inspection wells (horse wells) need to be built. The construction period of inspection wells (horse wells) constructed by traditional construction methods is long, and it also affects the surrounding conditions. At the same time, settlement and deviation are prone to occur in the inspection wells during the construction process, which leads to seepage. At the same time, the gap between the pipeline and the inspection well (horse well) is not sealed enough, which is prone to leakage and has low waterproof performance.

[0004] In view of the above problems, in the prior art, a Chinese patent with publication number CN209924089U proposes a jacking well device for pipeline construction, including a foundation pit hole, a steel casing, a prefabricated jacking well, a butt joint and an ordinary pipe joint. The site requirements of the device are greatly reduced, and only the site required for a bored pile is required, and the construction period is short. Since the pipeline is repaired first and then the well is made, the total construction period of the jacking pipe will be increased. When the jacking pipe method is used for pipeline renewal, the side wall friction resistance increases sharply due to the "lower head" of the jacking main machine under the action of gravity when the jacking main machine is constructed. At the same time, the existing auxiliary equipment cannot be fully recycled, resulting in a waste of resources. The Chinese patent with publication number CN204163178U proposes a jacking pipe interval combined inspection well, including a wellbore and a well chamber structure, and a cover plate is arranged between the wellbore and the well chamber structure. The device has strong anti-seepage ability and a safe and reliable structure, but does not solve the problem of the sharp increase in friction resistance when the jacking pipe passes through the inspection well.

[0005] In addition, the Chinese patent with the publication number CN212670774U proposes a riding well device suitable for narrow construction conditions in urban areas, including a wellbore, a first connecting pipe is arranged on both sides of the bottom of the wellbore, a second connecting pipe is arranged at one end of the first connecting pipe, a connecting sleeve is connected to the outer side of the connection between the first connecting pipe and the second connecting pipe, a notch is provided on the outer surface of the connecting sleeve, and fixed blocks are fixedly connected at both ends of the notch, a bolt is provided on one side of one of the fixed blocks, one end of the bolt passes through the two fixed blocks respectively, an annular limiting groove is provided on the outer surface of the first connecting pipe and the second connecting pipe, and an annular limiting block is fixedly connected at both ends of the inner surface of the connecting sleeve. The device improves the connection stability, uses bolts for reinforcement, avoids the problem of cracking, and reduces the occupation of the construction site. At the same time, it does not solve the problem of sharp increase in friction resistance when the top pipe passes through the inspection well. Utility Model Content

[0006] In view of the deficiencies in the above-mentioned background technology, the utility model proposes a resistance reducing device for a pipe jacking machine using the well-first-then-pipe method, which solves the problem of increased friction resistance when the pipe jacking machine passes through an inspection well in the prior art.

[0007] The technical solution of the utility model is achieved as follows: a drag reduction device for a pipe jacking machine using the well-first-pipe-later method comprises a support seat, on which is provided at least one roller assembly, the roller assembly comprising a horizontally arranged bottom roller and two symmetrically arranged side rollers, the side rollers and the bottom roller forming an arc roller group or a U-shaped roller group.

[0008] As a preferred embodiment, the support seat includes two symmetrically arranged frames, an upper support frame is provided on the upper part of the frame, an inclined support frame is provided on the corresponding side of the two frames, a side roller is provided between the upper support frame and the corresponding inclined support frame; a bottom roller is provided between the lower parts of the two corresponding inclined support frames on the two frames.

[0009] As a preferred solution, the diagonal support frame and the side rollers and bottom rollers are located on the same arc surface; the side rollers and bottom rollers are rollers with arc-shaped longitudinal sections, so as to provide stable rolling support for the pipe jacking machine and reduce friction resistance.

[0010] As a preferred embodiment, the frame includes a vertical frame and a base frame. The corresponding ends of the base frames of the two frames are provided with connecting flanges, and the two corresponding connecting flanges are connected by bolts to achieve a detachable connection between the two frames. The outer periphery of the base frame is provided with bottom threaded holes, which can be used to cooperate with the threaded holes on the inner wall of the prefabricated inspection well to fix the frame.

[0011] As a preferred solution, the vertical frame and the bottom frame are vertically arranged to form an inverted T-shaped frame or an L-shaped frame to improve the overall stability; a reinforcing rod is provided between the vertical frame and the bottom frame to improve the overall support strength. Preferably, the upper support frame is a U-shaped frame or an E-shaped frame to stably support the side rollers.

[0012] As a preferred solution, one end of the diagonal support frame is hinged on the support seat, and the other end is connected to a telescopic drive member, one end of the side roller is hinged to the upper support frame, and the other end is hinged to the corresponding diagonal support frame. The telescopic drive member can be a telescopic cylinder.

[0013] As a preferred solution, the lower parts of the two corresponding diagonal support frames on the two frames are provided with telescopic shafts, and the bottom roller shafts are rotatably arranged on the telescopic shafts. The telescopic shafts are matched with different bottom roller shafts to adjust the support curvature and adapt to the construction of different pipe jacking machines.

[0014] As a preferred embodiment, the drag reduction device of the pipe jacking machine using the well-first-then-pipe method also includes a prefabricated inspection well, which is provided with reserved openings and reserved grouting holes. When the support seat is located in the prefabricated inspection well, the bottom roller corresponds to the reserved openings.

[0015] The beneficial effects of the utility model are as follows: the utility model reduces the resistance of the jacking pipe when passing through the inspection well by forming an arc roller group or a U-shaped roller group by the side rollers and the bottom rollers, and enables the jacking machine to accurately pass through the reserved opening. The utility model utilizes the combination of the bottom roller and the side roller to ensure that the jacking machine can reduce the jacking resistance while twisting, further improving the efficiency of jacking construction. The resistance reduction device of the jacking machine of the well-first-then-pipe method of the utility model has a simple equipment structure, and the support frame and the base are connected by flanges, so that they can be quickly disassembled and passed through inspection wells of smaller sizes, and can be recycled at the same time. After simple processing, it is suitable for inspection wells of different sizes and has good economy. The utility model can adapt to jacking machines of different diameters by adjusting the curve rate of the side rollers and the bottom rollers, thereby fully improving the applicability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 This is a schematic diagram of a circular chassis structure adopted in the utility model.

[0018] Figure 2 This is a schematic diagram of a rectangular chassis structure adopted in the utility model.

[0019] Figure 3 This is a schematic diagram of the structure of the utility model in Example 3.

[0020] Figure 4 This is a schematic diagram of the utility model in a prefabricated inspection well. DETAILED DESCRIPTION

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

[0022] like Figure 1 As shown, embodiment 1, a drag reduction device for a pipe jacking machine using the well-first-then-pipe method, includes a support seat 14, which is the main supporting structure. The support seat 14 is provided with at least one roller assembly, and the number of roller assemblies is set according to needs to ensure that the pipe jacking machine can smoothly and stably enter the drag reduction device. As a preferred solution, two or three roller assemblies are provided on the support seat 14, and three roller assemblies are taken as an example in the figure; the three roller assemblies are arranged in parallel. The roller assembly includes a horizontally arranged bottom roller 7 and two symmetrically arranged side rollers 8, and the side rollers 8 are located on both sides of the bottom roller 7, so that the side rollers 8 and the bottom roller 7 form an arc roller group or a U-shaped roller group; adapted to the circular shell of the pipe jacking machine.

[0023] During the actual construction process, the pipe jacking machine passes through the inspection well and the drag reduction device. The drag reduction device is placed as a whole in the inspection well. After adjusting the installation height, the support seat is fixed. When the main machine of the pipe jacking machine comes out of the reserved hole, the main machine of the pipe jacking machine first contacts the bottom roller. Since the bottom roller is a curve, an upward component of force will be generated on the main machine under the action of the jacking force, thereby reducing the influence of the self-weight of the main machine of the pipe jacking machine, and at the same time, the friction between the pipe jacking machine and the side wall of the inspection well will also be reduced; at the same time, the side roller will also limit the deviation of the pipe jacking machine, ensuring that the pipe jacking machine can accurately enter the reserved hole on the other side of the inspection well, thereby improving the construction of the pipe jacking machine.

[0024] like Figure 3As shown, Example 2 is a drag reduction device for a pipe jacking machine using the well-first-then-pipe method. On the basis of Example 1, the support seat 14 described in this embodiment includes two symmetrically arranged frames, and two detachable frames are used to form the support seat, so that the device can be recycled and reused. At the same time, the frame provides an installation position for the bottom roller and the side roller, and the bottom roller and the side roller can be removed from the support frame. An upper support frame 1 is provided on the upper part of the frame, and the upper support frame can be fixed to the upper part of the frame by welding or bolting, providing an upper connection for the side roller 8. An inclined support frame 3 is provided on the corresponding side of the two frames, that is, an inclined support frame is provided on the inner side of the frame, and the inclined support frame is inclined to fix the side roller 8, and its height and inclination angle can be adjusted according to the diameter of the pipe jacking machine. A side roller 8 is provided between the upper support frame 1 and the corresponding diagonal support frame 3 to ensure the stability of the side roller. The side roller 8 is used to limit the displacement of the position of the pipe jacking machine caused by the twisting and rolling of the pipe jacking machine; and it can be removed from the support frame 1 and the side roller diagonal support frame 3. A bottom roller 7 is provided between the lower parts of the two corresponding diagonal support frames 3 on the two frames. The bottom roller 7 prevents the pipe jacking machine from "lowering its head" due to gravity, which causes the friction force of pushing to increase. The device can be removed from the support frame. It is necessary to ensure that the lowest position of its upper curve is slightly higher than the bottom of the inspection well bottom plate 11 close to the reserved hole 13. After the pipe jacking machine passes through the reserved hole and contacts the curve roller of the bottom roller 7, an upward component force will be generated under the action of the pushing force to offset the influence of the self-weight of the pipe jacking machine, and at the same time, the pipe jacking machine will be able to enter the device normally.

[0025] As an implementation method, the diagonal support frame 3, the side rollers 8, and the bottom rollers 7 are located on the same arc surface, so that they can support the pipe jacking machine at the same time, thereby improving the stability of the support. The side rollers 8 and the bottom rollers 7 are both rollers with arc-shaped longitudinal sections; according to the specifications of the pipe jacking machine, the curve slope of the rollers can be adjusted by replacing the side rollers 8 and the bottom rollers 7 of different specifications.

[0026] As an embodiment, the frame includes a vertical frame 141 and a bottom frame 4; the vertical frame 141 and the bottom frame 4 are vertically arranged to form an inverted T-shaped frame or an L-shaped frame; to improve the stability of the frame, wherein the bottom frame can be semicircular or rectangular, and can be selected according to the situation of the prefabricated inspection well. The bottom frame structure is not limited to circular or rectangular, and can be adjusted according to the shape of the inspection well bottom plate 11, and is as consistent as possible with the shape of the inspection well bottom plate 11. A reinforcing rod 2 is provided between the vertical frame 141 and the bottom frame 4; to improve the overall strength and stability of the frame. A connecting flange 5 is provided at the corresponding end of the bottom frame 4 of the two frames, and the corresponding two connecting flanges 5 are connected by bolts to realize the detachable connection of the frame, and the connecting flange 5 serves as a connecting and fixing device for the two parts of the base. After the top pipe construction is completed, the top pipe in the inspection well is removed, and then the support frame 1 can be disassembled through the connecting flange 5 on the bottom frame 4, and the bolts between the bottom frame 4 and the bottom surface 11 of the inspection well are removed, and then the inspection well can be easily moved out. The outer periphery of the bottom frame 4 is provided with a plurality of bottom threaded holes 6; the bottom threaded holes cooperate with the connection holes provided on the prefabricated inspection well and are fixed by bolts. The upper support frame 1 is a U-shaped frame or an E-shaped frame, and a U-shaped frame includes two connection ends on which two side rollers 8 can be installed at the same time; an E-shaped frame includes three connection ends on which three side rollers 8 can be installed at the same time; the connection ends extend out of the vertical frame 141, so that the side rollers 8 can contact the outer wall of the pipe jacking machine, provide stable rolling support for it, and reduce the side friction resistance.

[0027] like Figure 3 As shown, Example 3 is a drag reduction device for a pipe jacking machine using the well-first-then-pipe method. Based on Example 1, this example proposes an implementation scheme, in which one end of the diagonal support frame 3 is hinged on the support seat 14, and the other end is connected to a telescopic drive member 15. The telescopic drive member 15 can be a telescopic oil cylinder or a gas cylinder; one end of the telescopic oil cylinder is hinged on one side of the diagonal support frame, and the other end is fixed on the base frame. Under the action of the telescopic oil cylinder, the diagonal support frame can swing around the hinge point to change the slope of the diagonal support frame to adapt to pipe jacking machines of different diameters. At the same time, one end of the side roller shaft 8 is hinged to the upper support frame 1, and the other end is hinged to the corresponding diagonal support frame 3. When the diagonal support frame swings, the side roller shaft swings accordingly to make its slope consistent, and at the same time, the pipe jacking machine is stably supported.

[0028] As an implementation scheme, the lower parts of the two corresponding diagonal support frames 3 on the two frames are provided with telescopic shafts 71, and the bottom roller shaft 7 is rotatably set on the telescopic shaft 71. The telescopic shaft can adopt the existing telescopic rod, or the optical shaft and the hole can be matched. The optical shaft moves relative to the hole set on the frame to adjust the extended length to achieve the purpose of telescoping. When the optical shaft is extended to a suitable length, it is fixed with bolts and other fixings. The curve slope of the bottom roller shaft is adjusted by matching the telescopic shaft with roller shafts of different specifications to adapt to the outer diameters of different pipe jacking machines.

[0029] like Figure 4 As shown, Example 4: The drag reduction device of the pipe jacking machine using the well-first-then-pipe method, when applied to the well-first-then-pipe method construction, also includes a prefabricated inspection well 10, and the prefabricated inspection well 10 can be composed of multiple inspection well pipe sections. The prefabricated inspection well 10 is provided with an inspection well cover 9 on the upper part, which is installed on the top of the inspection well to protect the underground pipelines and prevent debris and personnel from falling in; the prefabricated inspection well 10 is provided with an inspection well floor plate 11 at the bottom; the inspection well floor plate 11 is used to close the bottom of the inspection well and to fix the base. The prefabricated inspection well 10 is provided with a reserved opening 13 and a reserved grouting hole 12, and the reserved grouting hole 12 is used for later grouting to fill the gap between the pipe segment and the soil. When the support seat 14 is located in the prefabricated inspection well 10, the bottom roller 7 corresponds to the reserved opening 13; the reserved opening 13 is for facilitating the passage of the pipe jacking machine. The bottom roller 7 ensures that the lowest position of its upper curve is slightly higher than the bottom of the inspection well bottom plate 11 close to the reserved hole 13 to prevent the jacking friction from increasing due to the "head down" caused by gravity.

[0030] During construction, the drag reduction device is placed in the inspection well, and the base is fixed after adjusting the installation height. When the main unit of the pipe jacking machine comes out of the reserved hole, the main unit of the pipe jacking machine first contacts the bottom roller. Since the bottom roller is a curved surface, an upward component of force will be generated on the main unit under the action of the jacking force, thereby reducing the influence of the main unit's own weight, and also reducing the friction between the pipe jacking machine and the side wall of the inspection well; at the same time, the side rollers will also limit the deviation of the pipe jacking machine, ensuring that the pipe jacking machine can accurately enter the reserved hole on the other side of the inspection well.

[0031] The utility model reduces the resistance of the pipe jacking machine passing through the inspection well by installing a drag reduction device in the inspection well, and can ensure that the pipe jacking machine can smoothly pass through the reserved hole of the inspection well. The equipment occupies a small area, can be disassembled and passed through a wellhead of a smaller size, and can be recycled, which is economical.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A drag reduction device for a pipe jacking machine using the well-first-pipe-later method, characterized in that: The invention comprises a support seat (14), wherein at least one roller assembly is arranged on the support seat (14), wherein the roller assembly comprises a horizontally arranged bottom roller (7) and two symmetrically arranged side rollers (8), wherein the side rollers (8) and the bottom roller (7) form an arc-shaped roller assembly or a U-shaped roller assembly.

2. The drag reduction device for a pipe jacking machine using the well-first-pipe-last method according to claim 1 is characterized in that: The support seat (14) comprises two symmetrically arranged frames, wherein an upper support frame (1) is provided on the upper part of the frame, and an oblique support frame (3) is provided on the corresponding side of the two frames, and a side roller shaft (8) is provided between the upper support frame (1) and the corresponding oblique support frame (3); and a bottom roller shaft (7) is provided between the lower parts of the two corresponding oblique support frames (3) on the two frames.

3. The drag reduction device of the pipe jacking machine of the well-first-pipe-last method according to claim 2 is characterized in that: The diagonal support frame (3) and the side roller shaft (8) and the bottom roller shaft (7) are located on the same arc-shaped surface; the side roller shaft (8) and the bottom roller shaft (7) are roller shafts with arc-shaped longitudinal sections.

4. The drag reducing device for a pipe jacking machine using the well-first-pipe-last method according to claim 2 or 3, characterized in that: The frame body comprises a vertical frame (141) and a bottom frame (4), wherein corresponding ends of the bottom frames (4) of the two frame bodies are provided with connecting flanges (5), the two corresponding connecting flanges (5) are connected by bolts, and the outer periphery of the bottom frame (4) is provided with bottom threaded holes (6).

5. The drag reduction device for a pipe jacking machine using the well-first-pipe-last method according to claim 4 is characterized in that: The vertical frame (141) and the bottom frame (4) are arranged vertically to form an inverted T-shaped frame or an L-shaped frame; a reinforcing rod (2) is provided between the vertical frame (141) and the bottom frame (4).

6. The drag reduction device for a pipe jacking machine using the well-first-pipe-last method according to claim 2 or 5, characterized in that: The upper support frame (1) is a U-shaped frame or an E-shaped frame.

7. The drag reduction device for a pipe jacking machine using the well-first-pipe-last method according to claim 2 is characterized in that: One end of the diagonal support frame (3) is hinged on the support seat (14), and the other end is connected to the telescopic driving member (15); one end of the side roller shaft (8) is hinged to the upper support frame (1), and the other end is hinged to the corresponding diagonal support frame (3).

8. The drag reducing device for a pipe jacking machine using the well-first-pipe-last method according to claim 7 is characterized in that: The telescopic driving member (15) is a telescopic oil cylinder.

9. The drag reducing device for a pipe jacking machine using the well-first-pipe-last method according to claim 2 or 8, characterized in that: A telescopic shaft (71) is provided at the lower part of the two corresponding diagonal support frames (3) on the two frame bodies, and the bottom roller shaft (7) is rotatably arranged on the telescopic shaft (71).

10. The drag reducing device for a pipe jacking machine using the well-first-pipe-last method according to claim 1, characterized in that: It also includes a prefabricated inspection well (10), on which a reserved opening (13) and a reserved grouting hole (12) are provided. When the support seat (14) is located in the prefabricated inspection well (10), the bottom roller (7) corresponds to the reserved opening (13).

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