Construction method for underground pipeline penetrating through railway line

Abstract

The construction method comprises the following steps that S1, a groove is excavated beside the railway line, a bottom plate is fixed to the inner bottom wall of the groove, a first vertical plate is fixed to the top of the bottom plate, a supporting mechanism is arranged, and a special hoisting tool is adopted to be inserted into the two ends of a to-be-hoisted jacking pipe for hoisting; s2, a jacking assembly used for pushing the jacking pipe hoisted to the supporting mechanism forwards is arranged on the first vertical plate, a front end pipe matched with the jacking pipe in an inserted mode is arranged at the front end of the jacking pipe, and a drill bit used for jacking pipe construction tunneling is arranged at the end of the front end pipe; and S3, a driving piece and a jacking assembly of the drill bit are started, so that the jacking pipe and the front end pipe advance and gradually stretch into the underground of the railway line, before the jacking pipe is submerged into the underground of the railway line, the special hoisting tool continues to be adopted for hoisting the next jacking pipe, and the operation in the S2 is repeated. According to the method, the mode that a rope is used for sleeving the outer side of the to-be-hoisted jacking pipe for hoisting in the traditional technology is changed, and the efficiency of underground pipeline jacking construction is improved.

Description

Technical Field

[0001] The invention relates to the technical field of underground pipeline construction, and in particular to a method for constructing an underground pipeline crossing a railway line. Background Art

[0002] Pipelines are the main equipment for transporting gas and liquid. As people's requirements for the environment become higher and higher, most modern pipelines are laid underground. In the construction process of underground pipelines, excavation and burial are usually used for construction. However, in the construction process of underground pipelines crossing railway lines, especially in some industrial and mining enterprises where there are many pipelines crossing railway lines, the traditional excavation and burial construction methods conflict with railway transportation, and the construction period is strictly limited. In addition, the demolition and restoration of railway tracks increase the construction cost, which is not conducive to the normal production and cost control of enterprises. Therefore, the jacking construction method has become a new underground pipeline installation method.

[0003] During the construction of underground pipe jacking, workers usually use lifting tools to install the pipe jacking into the trench for pipeline construction, and use the pipe jacking tool to push the pipe forward, so that the front end of the pipe gradually moves underground under the action of the front end drill bit. In the above process, the lifting tool is usually lifted by putting a rope on the outer wall of the pipe jacking. This lifting method is more troublesome when removing the rope on the pipe jacking later, and the rope is easy to get stuck between the bottom of the pipe jacking and the pipe support in the trench. Therefore, it is necessary to improve the design of the lifting tool for the pipe jacking. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a method for constructing an underground pipeline crossing a railway line.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions: A method for constructing an underground pipeline crossing a railway line, comprising the following steps:

[0006] S1. Dig a trench beside the railway line, fix a bottom plate on the bottom wall of the trench, fix a first vertical plate on the top of the bottom plate and set a supporting mechanism for supporting the top pipe to be hoisted, insert two ends of the top pipe to be hoisted with a special hoisting tool and hoist it;

[0007] S2, a jacking assembly for pushing the jacking pipe hung on the supporting mechanism forward is arranged on the first vertical plate, a front end pipe for plugging and matching with the jacking pipe is arranged at the front end of the jacking pipe, and a drill bit for jacking construction and excavation is arranged at the end of the front end pipe;

[0008] S3, start the driving part and jacking assembly of the drill bit to make the jacking pipe and the front end pipe move forward and gradually extend into the underground of the railway line. Before the jacking pipe is immersed in the underground of the railway line, continue to use special lifting tools to lift the next jacking pipe, and repeat the operation of S2 until the underground pipeline installation work crossing the railway line is completed.

[0009] By adopting the above technical solution, special lifting tools are inserted into both ends of the top pipe to be lifted for lifting, which changes the traditional technology of using ropes to be put on the outside of the top pipe to be lifted for lifting, avoids the tedious operation of removing the lifting ropes in the later stage, and is conducive to improving the efficiency of underground pipeline jacking construction.

[0010] Furthermore, the special hoisting tool comprises a mounting plate, a connecting rod is fixed at a position near both ends of the mounting plate at the bottom of the mounting plate, a clamping assembly is arranged on the connecting rods on both sides of the mounting plate, the clamping assemblies on both sides cooperate and clamp the two ends of the top pipe to be hoisted, and the clamping assembly comprises a mounting block fixed to the lower end of the connecting rod and a fixing block fixed to the bottom of the mounting block;

[0011] A plurality of lifting rings are fixed on the top of the mounting plate, the cross section of the fixing block is U-shaped, the notch of the fixing block faces downward, the clamping assembly also includes a clamping block movably mounted in the notch of the fixing block, and a driving assembly for driving the clamping block to rotate is jointly mounted on the mounting plate and the fixing block, so that the top of the clamping block cooperates with the bottom of the mounting block and clamps the end of the top pipe to be hoisted.

[0012] By adopting the above technical solution, the driving assembly can drive the clamping block to rotate, so that the clamping blocks at both ends rotate, and the clamping blocks on both sides respectively cooperate with the fixed blocks on both sides and clamp the ends of the top pipe to be hoisted, so as to hoist the top pipe to be hoisted, thereby improving the hoisting efficiency.

[0013] Furthermore, the sides of the fixing blocks on both sides that are close to each other are respectively fitted with the two end surfaces of the top pipe to be hoisted, the bottom of the mounting block is provided with an upper arc surface that cooperates with the top of the top pipe to be hoisted, and the top of the clamping block is provided with a lower arc surface that cooperates with the inner surface of the top pipe to be hoisted.

[0014] By adopting the above technical solution, the upper arc surface cooperates with the lower arc surface to increase the contact area between the top pipe to be hoisted and the fixing block and the clamping block, thereby improving the stability of the top pipe to be hoisted during the hoisting process.

[0015] Furthermore, the driving assembly includes an upper movable plate arranged below the mounting plate, a cylinder fixed to the mounting plate and used to drive the upper movable plate to rise and fall, a vertical rack fixed to the bottom of the upper movable plate near its end, a first rod fixed to the side wall of the fixing block away from the side of the top pipe to be hoisted, a transmission gear rotatably mounted on the first rod and meshed with the vertical rack, a driven gear rotatably mounted in the notch of the fixing block and meshed with the transmission gear, and a second rod fixedly sleeved on the rotating shaft of the driven gear, wherein the second rod is fixed to the clamping block;

[0016] The vertical rack, the first rod body, the transmission gear, the driven gear and the second rod body are each provided with two and symmetrically distributed on both sides of the upper movable plate, and are respectively used to drive the clamping blocks on both sides of the upper movable plate to rotate.

[0017] By adopting the above technical solution, when the top pipe to be hoisted is to be hoisted, the staff only first fits the side of the fixed blocks on both sides close to each other with the two end surfaces of the top pipe to be hoisted, and then drives the upper movable plate to rise through the cylinder, and the upper movable plate drives the transmission gear to rotate through the vertical rack, so that the driven gear and the second rod body rotate, and then the clamping block gradually rotates from a vertical state to a horizontal state, until the clamping block cooperates with the mounting block and clamps the end of the top pipe to be hoisted, so as to hoist the top pipe to be hoisted. After the hoisting is completed, the cylinder pushes the upper movable plate down after working, so that the vertical rack drives the transmission gear to rotate, thereby driving the driven gear and the second rod body to rotate, so that the second rod body drives the clamping block to gradually open to a vertical state, and the clamping block gradually releases the top pipe to be hoisted, so that the top pipe to be hoisted is supported by the support mechanism.

[0018] Furthermore, rubber sheets are attached to and fixed on both the upper arc surface and the lower arc surface.

[0019] By adopting the above technical solution, the rubber sheet is made of rubber material and has good elasticity, which plays a good protective role on the fixing block and the clamping block and reduces clamping damage.

[0020] Furthermore, two second vertical plates parallel to each other are fixed on the top of the base plate, and the supporting mechanism includes a supporting assembly and a power assembly. The supporting assembly is provided with two groups and is symmetrically arranged, and each group of the supporting assemblies includes a lower movable plate located between the second vertical plates, a mounting seat fixed to the top of the lower movable plate, and a roller rotatably installed on the top of the mounting seat. There are multiple groups of mounting seats and rollers on the lower movable plate, and the power assembly is used to drive the two groups of lower movable plates to move closer to or away from each other, and the two groups of rollers cooperate to provide active support to both sides of the bottom of the top pipe to be hoisted.

[0021] Furthermore, the power assembly includes a bidirectional threaded rod rotatably installed between the two second vertical plates, a guide rod fixed between the two second vertical plates, and a motor fixed to one of the second vertical plates and used to drive the bidirectional threaded rod, the bidirectional threaded rod is provided with two sections of threads with equal pitch and opposite rotation direction, the lower movable plate is symmetrically distributed on the two sections of threads of the bidirectional threaded rod and threadedly connected, and the guide rod passes through the two lower movable plates and slides together.

[0022] By adopting the above technical solution, the motor drives the bidirectional threaded rod to rotate after working. Since the lower movable plate is threadedly connected with the bidirectional threaded rod and slidingly cooperates with the guide rod, the two lower movable plates are moved closer to or away from each other, so that the rollers on both sides cooperate and support the bottom of the lifting jacking pipe. During the lifting process, the jacking pipe may be skewed, and the rollers on both sides can cooperate to straighten the pipeline so that the jacking pipe keeps the axis consistent with the front pipeline.

[0023] Furthermore, the jacking assembly includes a jack fixed on the first vertical plate and a jacking block fixed on the output end of the jack. The jacking assembly is provided with multiple groups and is evenly distributed about the axis of the jacking pipe to be hoisted.

[0024] By adopting the above technical solution, the jack drives the top block to move after working, so that the top block acts on the top pipe, so as to complete the construction operation of the top pipe.

[0025] In summary, the present invention has the following beneficial effects:

[0026] 1. In this application, a special lifting tool is inserted into both ends of the top pipe to be lifted for lifting, which changes the traditional method of using a rope to be put on the outside of the top pipe to be lifted for lifting, and eliminates the cumbersome operation of removing the lifting rope in the later stage, which is conducive to improving the efficiency of underground pipeline jacking construction;

[0027] 2. In the present application, the driving assembly can drive the clamping block to rotate, so that the clamping blocks at both ends rotate, and the clamping blocks on both sides respectively cooperate with the fixed blocks on both sides and clamp the ends of the top pipe to be hoisted, thereby hoisting the top pipe to be hoisted, thereby improving the hoisting efficiency;

[0028] 3. In the present application, the upper arc surface cooperates with the lower arc surface to increase the contact area between the top pipe to be hoisted and the fixing block and the clamping block, thereby improving the stability of the top pipe to be hoisted during the hoisting process. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic diagram of the overall structure of an embodiment of the present invention;

[0030] Figure 2 is a schematic diagram of the structure of an embodiment of the present invention for highlighting a driving component;

[0031] Figure 3 is a structural schematic diagram of an embodiment of the present invention for highlighting a support mechanism;

[0032] Figure 4 It is a schematic diagram of the structure of an embodiment of the present invention for highlighting the driving assembly when driving the clamping block to clamp the jacking pipe;

[0033] Figure 5 It is a schematic diagram of the structure of an embodiment of the present invention for highlighting the driving assembly when driving the clamping block to release the jacking pipe.

[0034] In the figure: 1, bottom plate; 2, first vertical plate; 3, top pipe to be hoisted; 4, supporting mechanism; 41, supporting assembly; 411, lower movable plate; 412, mounting seat; 413, roller; 42, power assembly; 421, bidirectional threaded rod; 422, guide rod; 423, motor; 5, second vertical plate; 6, jacking assembly; 61, jack; 62, top block; 7, mounting plate; 71, connecting rod; 72, lifting ring; 8, clamping assembly; 81, mounting block; 811, upper arc surface; 82, fixing block; 83, clamping block; 831, lower arc surface; 9, driving assembly; 91, upper movable plate; 92, cylinder; 93, vertical rack; 94, first rod body; 95, transmission gear; 96, driven gear; 97, second rod body. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application; obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application without making creative work are within the scope of protection of the present application.

[0036] like Figure 1-5 As shown, the embodiment of the present application discloses a method for constructing an underground pipeline crossing a railway line, comprising the following steps:

[0037] S1. Dig a trench beside the railway line, fix a bottom plate 1 on the bottom wall of the trench, fix a first vertical plate 2 on the top of the bottom plate 1 and set a support mechanism 4 for supporting the top pipe 3 to be hoisted, insert the two ends of the top pipe 3 to be hoisted with a special hoisting tool and hoist it;

[0038] S2, a jacking assembly 6 for pushing the jacking pipe hung on the supporting mechanism 4 forward is arranged on the first vertical plate 2, a front end pipe for plugging and matching with the jacking pipe is arranged at the front end of the jacking pipe, and a drill bit for jacking construction and excavation is arranged at the end of the front end pipe;

[0039] S3, start the driving part of the drill bit and the jacking assembly 6, so that the jacking pipe and the front end pipe move forward and gradually extend into the underground of the railway line. Before the jacking pipe is immersed in the underground of the railway line, continue to use special lifting tools to lift the next jacking pipe, and repeat the operation of S2 until the underground pipeline installation work crossing the railway line is completed.

[0040] Special lifting tools are inserted into both ends of the top pipe 3 to be lifted for lifting, which changes the traditional technology of using ropes to be put on the outside of the top pipe 3 to be lifted for lifting, eliminates the tedious operation of removing the lifting ropes in the later stage, and is conducive to improving the efficiency of underground pipeline jacking construction.

[0041] The special lifting tool includes a mounting plate 7, connecting rods 71 ​​are fixed at positions near the two ends of the mounting plate 7 at the bottom of the mounting plate 7, clamping assemblies 8 are arranged on the connecting rods 71 ​​on both sides of the mounting plate 7, the clamping assemblies 8 on both sides cooperate and clamp the two ends of the top pipe 3 to be lifted, the clamping assembly 8 includes a mounting block 81 fixed to the lower end of the connecting rod 71 and a fixing block 82 fixed to the bottom of the mounting block 81; a plurality of lifting rings 72 are fixed to the top of the mounting plate 7, the cross-section of the fixing block 82 is U-shaped, and the notch of the fixing block 82 faces downward, the clamping assembly 8 also includes a clamping block 83 movably installed in the notch of the fixing block 82, and a driving assembly 9 for driving the clamping block 83 to rotate is jointly installed on the mounting plate 7 and the fixing block 82, so that the top of the clamping block 83 cooperates with the bottom of the mounting block 81 and clamps the end of the top pipe 3 to be lifted.

[0042] The driving assembly 9 can drive the clamping block 83 to rotate, so that the clamping blocks 83 at both ends rotate, and the clamping blocks 83 on both sides respectively cooperate with the fixing blocks 82 on both sides and clamp the ends of the top pipe 3 to be hoisted, thereby hoisting the top pipe to be hoisted, thereby improving the hoisting efficiency.

[0043] The sides of the fixing blocks 82 on both sides that are close to each other are respectively fitted with the two end surfaces of the top pipe 3 to be hoisted, and the bottom of the mounting block 81 is provided with an upper arc surface 811 that matches with the top of the top pipe 3 to be hoisted, and the top of the clamping block 83 is provided with a lower arc surface 831 that matches with the inner surface of the top pipe 3 to be hoisted. The upper arc surface 821 cooperates with the lower arc surface 831 to increase the contact area between the top pipe 3 to be hoisted and the fixing block 82 and the clamping block 83, thereby improving the stability of the top pipe 3 to be hoisted during the hoisting process.

[0044] The driving assembly 9 includes an upper movable plate 91 arranged below the mounting plate 7, a cylinder 92 fixed on the mounting plate 7 and used to drive the upper movable plate 91 to rise and fall, a vertical rack 93 fixed at a position near the end of the bottom of the upper movable plate 91, a first rod 94 fixed on the side wall of the fixed block 82 away from the side of the top pipe 3 to be hoisted, a transmission gear 95 rotatably mounted on the first rod 94 and meshing with the vertical rack 93, a driven gear 96 rotatably mounted in the notch of the fixed block 82 and meshing with the transmission gear 95, and a second rod 97 fixedly sleeved on the rotating shaft of the driven gear 96, and the second rod 97 is fixed to the clamping block 83; the vertical rack 93, the first rod 94, the transmission gear 95, the driven gear 96 and the second rod 97 are each provided with two and symmetrically distributed on both sides of the upper movable plate 91, respectively used to drive the clamping blocks 83 on both sides of the upper movable plate 91 to rotate.

[0045] When the top pipe 3 to be hoisted is to be hoisted, the staff only first fits the side of the fixed blocks 82 on both sides close to each other with the two end surfaces of the top pipe 3 to be hoisted, and then drives the upper movable plate 91 to rise through the cylinder 92, and the upper movable plate 91 drives the transmission gear 95 to rotate through the vertical rack 93, so that the driven gear 96 and the second rod 97 rotate, and then the clamping block 83 gradually rotates from the vertical state to the horizontal state, until the clamping block 83 cooperates with the mounting block 81 and clamps the end of the top pipe 3 to be hoisted, so as to hoist the top pipe 3 to be hoisted. After the hoisting is completed, the cylinder 92 pushes the upper movable plate 91 downward after working, so that the vertical rack 93 drives the transmission gear 95 to rotate, thereby driving the driven gear 96 and the second rod 97 to rotate, so that the second rod 97 drives the clamping block 83 to gradually open to the vertical state, and the clamping block 83 gradually releases the top pipe 3 to be hoisted, so that the top pipe 3 to be hoisted is supported by the support mechanism 4.

[0046] A rubber sheet (not shown) is attached and fixed to the upper arc surface 821 and the lower arc surface 831. The rubber sheet is made of rubber material and has good elasticity, which plays a good protective role on the fixing block 82 and the clamping block 83 and reduces clamping damage.

[0047] Two second vertical plates 5 parallel to each other are fixed on the top of the base plate 1. The support mechanism 4 includes a support assembly 41 and a power assembly 42. The support assembly 41 is provided with two groups and is symmetrically arranged. Each group of support assemblies 41 includes a lower movable plate 411 located between the second vertical plates 5, a mounting seat 412 fixed to the top of the lower movable plate 411, and a roller 413 rotatably installed on the top of the mounting seat 412. There are multiple groups of mounting seats 412 and rollers 413 on the lower movable plate 411. The power assembly 42 is used to drive the two groups of lower movable plates 411 to move closer to or away from each other. The two groups of rollers 413 cooperate and provide active support to the two sides of the bottom of the top pipe 3 to be hoisted. The power assembly 42 includes a bidirectional threaded rod 421 rotatably installed between the two second vertical plates 5, a guide rod 422 fixed between the two second vertical plates 5, and a motor 423 fixed on one of the second vertical plates 5 and used to drive the bidirectional threaded rod 421. The bidirectional threaded rod 421 is provided with two sections of threads with equal pitches and opposite rotation directions. The lower movable plate 411 is symmetrically distributed on the two sections of the threads of the bidirectional threaded rod 421 and is threadedly connected. The guide rod 422 passes through the two lower movable plates 411 and slides together.

[0048] After the motor 423 starts working, it drives the bidirectional threaded rod 421 to rotate. Since the lower movable plate 411 is threadedly connected to the bidirectional threaded rod 421 and slides with the guide rod 422, the two lower movable plates 411 are moved closer to or farther away from each other, so that the rollers 413 on both sides cooperate and support the bottom of the lifting jacking pipe 3. During the lifting process, the jacking pipe may be skewed. The rollers 413 on both sides can cooperate to straighten the pipeline so that the jacking pipe keeps the axis consistent with the front pipeline.

[0049] In this embodiment, the jacking assembly 6 includes a jack 61 fixed on the first vertical plate 2 and a jacking block 62 fixed to the output end of the jack 61. The jacking assembly 6 is provided with multiple groups and is evenly distributed about the axis of the jacking pipe 3 to be hoisted.

[0050] The principle of use of a method for constructing an underground pipeline crossing a railway line in this embodiment is as follows: a special lifting tool is inserted into both ends of a top pipe 3 to be lifted for lifting, which changes the traditional method of using a rope to be looped around the outside of the top pipe 3 to be lifted for lifting, thereby eliminating the tedious operation of removing the lifting rope in the later stage, and is beneficial to improving the efficiency of underground pipeline jacking construction.

[0051] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A method for constructing an underground pipeline crossing a railway line, characterized in that: The steps include: S1. A trench is excavated beside a railway line, a bottom plate (1) is fixed on the bottom wall of the trench, a first vertical plate (2) is fixed on the top of the bottom plate (1), and a supporting mechanism (4) for supporting a top pipe (3) to be hoisted is provided, and a special hoisting tool is used to insert both ends of the top pipe (3) to be hoisted and hoist it; S2, a jacking assembly (6) for pushing the jacking pipe hung on the support mechanism (4) forward is arranged on the first vertical plate (2), a front end pipe for plugging and matching with the jacking pipe is arranged at the front end of the jacking pipe, and a drill bit for jacking construction and excavation is arranged at the end of the front end pipe; S3, start the driving part of the drill bit and the jacking assembly (6), so that the jacking pipe and the front pipe move forward and gradually extend into the underground of the railway line. Before the jacking pipe is immersed in the underground of the railway line, continue to use special lifting tools to lift the next jacking pipe, and repeat the operation of S2 until the underground pipeline installation work crossing the railway line is completed.

2. The method for constructing an underground pipeline crossing a railway line according to claim 1, characterized in that: The special hoisting tool comprises a mounting plate (7), a connecting rod (71) is fixed at a position near the two ends of the mounting plate (7) at the bottom of the mounting plate (7), a clamping assembly (8) is arranged on the connecting rods (71) on both sides of the mounting plate (7), the clamping assemblies (8) on both sides cooperate to clamp the two ends of the top pipe (3) to be hoisted, and the clamping assembly (8) comprises a mounting block (81) fixed to the lower end of the connecting rod (71) and a fixing block (82) fixed to the bottom of the mounting block (81); A plurality of lifting rings (72) are fixed on the top of the mounting plate (7); the cross section of the fixing block (82) is U-shaped, and the notch of the fixing block (82) faces downward; the clamping assembly (8) further comprises a clamping block (83) movably mounted in the notch of the fixing block (82); a driving assembly (9) for driving the clamping block (83) to rotate is mounted on the mounting plate (7) and the fixing block (82) so that the top of the clamping block (83) cooperates with the bottom of the mounting block (81) and clamps the end of the top pipe (3) to be hoisted.

3. The method for constructing an underground pipeline crossing a railway line according to claim 2, characterized in that: The sides of the fixing blocks (82) on both sides that are close to each other are respectively fitted with the two end surfaces of the top pipe (3) to be hoisted, the bottom of the mounting block (81) is provided with an upper arc surface (811) that matches with the top of the top pipe (3) to be hoisted, and the top of the clamping block (83) is provided with a lower arc surface (831) that matches with the inner surface of the top pipe (3) to be hoisted.

4. The method for constructing an underground pipeline crossing a railway line according to claim 3, characterized in that: The driving assembly (9) comprises an upper movable plate (91) arranged below the mounting plate (7), a cylinder (92) fixed on the mounting plate (7) and used for driving the upper movable plate (91) to move up and down, a vertical rack (93) fixed at a position near the bottom of the upper movable plate (91) and close to its end, a first rod (94) fixed on a side wall of a fixing block (82) away from a side of the top pipe (3) to be hoisted, a transmission gear (95) rotatably mounted on the first rod (94) and meshing with the vertical rack (93), a driven gear (96) rotatably mounted in a notch of the fixing block (82) and meshing with the transmission gear (95), and a second rod (97) fixedly sleeved on a rotating shaft of the driven gear (96), wherein the second rod (97) is fixed to the clamping block (83); The vertical rack (93), the first rod (94), the transmission gear (95), the driven gear (96) and the second rod (97) are each provided with two and symmetrically distributed on both sides of the upper movable plate (91), and are respectively used to drive the clamping blocks (83) on both sides of the upper movable plate (91) to rotate.

5. The method for constructing an underground pipeline crossing a railway line according to claim 4, characterized in that: Rubber sheets are attached to and fixed on both the upper arc surface (821) and the lower arc surface (831).

6. The method for constructing an underground pipeline crossing a railway line according to claim 4, characterized in that: Two second vertical plates (5) parallel to each other are fixed on the top of the bottom plate (1); the support mechanism (4) comprises a support assembly (41) and a power assembly (42); the support assembly (41) is provided with two groups and is symmetrically arranged; each group of the support assembly (41) comprises a lower movable plate (411) located between the second vertical plates (5), a mounting seat (412) fixed on the top of the lower movable plate (411), and a roller (413) rotatably mounted on the top of the mounting seat (412); the mounting seat (412) and the roller (413) on the lower movable plate (411) are provided in multiple groups; the power assembly (42) is used to drive the two groups of lower movable plates (411) to move closer to or farther from each other; the two groups of rollers (413) cooperate to movably support the bottom sides of the top pipe (3) to be hoisted.

7. The method for constructing an underground pipeline crossing a railway line according to claim 6, characterized in that: The power assembly (42) comprises a bidirectional threaded rod (421) rotatably mounted between the two second vertical plates (5), a guide rod (422) fixed between the two second vertical plates (5), and a motor (423) fixed on one of the second vertical plates (5) and used to drive the bidirectional threaded rod (421); the bidirectional threaded rod (421) is provided with two sections of threads with equal pitch and opposite rotation directions; the lower movable plate (411) is symmetrically distributed on the two sections of threads of the bidirectional threaded rod (421) and is threadedly connected; the guide rod (422) passes through the two lower movable plates (411) and is slidably fitted.

8. The method for constructing an underground pipeline crossing a railway line according to claim 6, characterized in that: The jacking assembly (6) comprises a jack (61) fixed on the first vertical plate (2) and a jacking block (62) fixed on the output end of the jack (61). The jacking assembly (6) is provided with a plurality of groups and is evenly distributed about the axis of the jacking pipe (3) to be hoisted.

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