Method for installing curved section of lining steel pipe water diversion tunnel

Abstract

The present application relates to a kind of lining steel pipe water diversion tunnel curve section installation method, comprising the following steps: conveyor belt controls the turnover of lining steel pipe and welds stiffening ring;Lining steel pipe both ends built-in flange ring installs inner bracing type steel;Adjacent lining steel pipe is connected using assembly type limiting plate and assembly type limiting block butt joint;Three-piece circle group welding operation is carried out;From bottom to top, pour lining steel pipe outer package concrete by compartment.This application has the beneficial effect that: through the built-in drive of horizontal assembly jig frame, the synchronous rotation of lining steel pipe is realized, and the limiting arm of elastic opening and closing is set, the loading and unloading efficiency of lining steel pipe is improved, and the horizontal assembly jig frame can control the interval flexibly based on track, the overall installation efficiency is higher, the time is less, the traditional vertical assembly mode of steel pipe outer belt stiffening ring is changed, and has strong practical value.

Description

Technical Field

[0001] This invention belongs to the field of water conservancy engineering, and in particular relates to a method for installing curved sections of water diversion tunnels with inner steel pipe lining. Background Technology

[0002] In recent years, with the improvement of my country's industrial and agricultural production levels and the development of the national economy, water conservancy projects have achieved tremendous success. Meanwhile, with the application of tunnel boring machine (TBM) technology in long-distance water pipelines, the processing, transportation, and assembly techniques of large-diameter steel lining pipes for tunnels have become particularly crucial.

[0003] In terms of the processing and fabrication of inner lining steel pipes, traditional processes employ a vertical construction method with stiffening rings, which is slow, costly, and prone to welding quality problems, severely impacting the construction period. In recent years, some scholars have proposed a horizontal processing method for steel pipes, but the overall horizontal jig is clearly insufficient in terms of stability, flexibility, and mobility. In addition, regarding the transportation of inner lining steel pipes, existing technologies typically utilize fixed umbrella-shaped steel internal supports to address the deformation of steel pipes during transportation. On-site length measurement, structural welding, and subsequent cutting significantly affect overall construction efficiency. Finally, in terms of assembling inner lining steel pipes, especially when the diameter of the inner lining steel pipes is large or the gap between the tunnel and the inner lining steel pipes is small, the transportation and assembly of inner lining steel pipes in long-distance tunnels is more difficult and risky. Currently, there is no good construction technology for handling joints in curved sections and sections with changing diameters.

[0004] In view of this, there is an urgent need to invent a method for installing water diversion tunnels with steel-lined pipes that is fast, accurate, and economically and technically efficient. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method for installing a curved section of a water diversion tunnel with an inner steel pipe lining.

[0006] This method for installing steel-lined water diversion tunnels on curved sections includes the following steps:

[0007] S1. Open the limiting arm of the horizontal assembly jig, hoist the inner steel pipe onto the conveyor belt of the horizontal assembly jig, and the conveyor belt controls the rotation of the inner steel pipe and welds the stiffening ring.

[0008] S2. The inner lining steel pipe has built-in flange rings at both ends to install the inner support steel, and all the adjustable struts on the inner support steel are in contact with the inner wall of the inner lining steel pipe.

[0009] S3. After the inner lining steel pipe is hoisted into the starting shaft, the transfer trolley is used to climb the pipe and adjust its position. Adjacent inner lining steel pipes are connected by prefabricated limit plates and prefabricated limit blocks.

[0010] S4. For the inner lining steel pipe in the variable diameter section, three pieces are joined together and welded. Electric hoists are installed on the top and both sides of the reinforced concrete pipe segment to carry out the three-piece joining and welding operation.

[0011] S5. Pour concrete into sections from bottom to top, lining the steel pipes with the outer layer of concrete.

[0012] Preferably, in step S1, the horizontal assembly jig includes a built-in drive motor, a conveyor belt, and a limiting arm. The built-in drive motors are symmetrically arranged and connected by the conveyor belt. A limiting base and an elastic base are symmetrically arranged on the top. A limiting arm is connected to the limiting base. The limiting arm is equipped with rollers and ring buckles. The limiting arm is connected to the elastic base through an adapter arm. The limiting arm of the horizontal assembly jig is opened, and the inner lining steel pipe is hoisted onto the conveyor belt of the horizontal assembly jig. An auxiliary limiting rope is installed through the ring buckle. Then, a stiffening ring is welded. The conveyor belt is electrically controlled to realize the flipping welding of the inner lining steel pipe. After the welding of multiple stiffening rings is completed, the inner lining steel pipe is carried away by a mobile trolley.

[0013] Preferably, in step S1, a track is provided on the construction ground, and two horizontal assembly jigs are installed on the track at intervals. The distance between two longitudinally adjacent sets of horizontal assembly jigs is adjusted according to the length of the inner steel pipe.

[0014] Preferably, in step S2, two sets of strut supports are symmetrically arranged on the upper and lower sides of the inner supporting steel. The strut supports are connected to adjustable struts, and the ends of the adjustable struts are equipped with rubber pads. All the adjustable struts on the inner supporting steel abut against the inner wall of the inner lining steel pipe. All the adjustable struts and the inner supporting steel have equal included angles. After the inner supporting steel is installed, the inner lining steel pipe is transported to the construction site by a transport vehicle.

[0015] As a preferred option, in step S3, the inner lining steel pipe of the curved section is pre-set with a bidirectional wedge shape according to different conditions. After the inner lining steel pipe is hoisted into the launching shaft, it is transported and installed section by section towards the receiving shaft by a transfer trolley. The transfer trolley is symmetrically equipped with four sets of wheels on the left and right. The middle part of the transfer trolley is located inside the inner lining steel pipe, and the front and rear parts extend from both ends of the inner lining steel pipe. The front part of the transfer trolley has a set of guide wheels and a set of auxiliary wheels, and the rear part has two sets of auxiliary wheels.

[0016] Preferably, in step S3, the surface of the transfer trolley is provided with two transverse slide rails, and each transverse slide rail is symmetrically provided with hydraulic uprights. The top of the hydraulic uprights is provided with follower wheel sets, which are connected by transverse connecting rods. The follower wheel sets abut against the inner wall of the top of the inner lining steel pipe to support the inner lining steel pipe. When the hydraulic uprights move along the transverse slide rails, the inner lining steel pipe moves laterally. The inner lining steel pipe in the tunnel is climbed and its position adjusted by the transfer trolley.

[0017] Preferably, in step S3, the inner lining steel pipes inside the tunnel are connected by prefabricated limiting plates and prefabricated limiting blocks. The two prefabricated limiting plates are vertically welded with limiting plate bases. The spacing between the prefabricated limiting plates is the same as the width of the prefabricated limiting blocks. The limiting plate bases are fixed to the top of the built-in flange ring at the tail end of the installed inner lining steel pipe by anchor bolts. The prefabricated limiting blocks are fixed to the top of the built-in flange ring at the first section of the inner lining steel pipe to be installed by anchor bolts. After the two sections of inner lining steel pipes are connected, the prefabricated limiting blocks are inserted between the prefabricated limiting plates.

[0018] As a preferred option, in step S4, the inner lining steel pipe in the variable diameter section is assembled and welded in three pieces. The inner lining steel pipe is divided into three pieces: the bottom inner lining pipe piece, the upper left inner lining pipe piece, and the upper right inner lining pipe piece. Anchor points are set in advance in the reinforced concrete pipe piece. Electric hoists are installed on the top and both sides of the reinforced concrete pipe piece through the anchor points. The bottom inner lining pipe piece, the upper left inner lining pipe piece, and the upper right inner lining pipe piece are assembled and welded in sequence using three electric hoists and a temporary operating trolley.

[0019] As a preferred option, in step S5, the concrete covering the inner steel pipe is poured in three layers in sections, with each section consisting of four to six sections of the inner steel pipe. A quick-closing mesh is used as the template for the section pouring, and grouting holes are provided at the top and the waistline positions on both sides of the inner steel pipe.

[0020] Preferably, in step S5, a ballast trolley is installed inside the inner steel pipe before pouring concrete, and a ballast water-filled bag is installed on the ballast trolley.

[0021] The beneficial effects of this invention are:

[0022] 1) This invention develops a horizontal, high-efficiency installation technology for steel pipe stiffening rings. The horizontal assembly jig incorporates a built-in drive motor to achieve synchronous rotation of the inner steel pipe, and features a flexible, opening / closing limit arm to improve the loading and unloading efficiency of the inner steel pipe. Furthermore, the horizontal assembly jig allows for flexible spacing control based on the track, resulting in higher overall installation efficiency and less time consumption. This invention changes the traditional vertical assembly mode of steel pipes with external stiffening rings and has significant practical value.

[0023] 2) This invention developed a transportation and assembly technology for curved sections of inner-lined steel pipes. A prefabricated internal support steel composite adjustable strut structural system was adopted to replace the traditional fixed welded umbrella-shaped internal support, improving on-site construction efficiency.

[0024] 3) This invention uses a transfer platform wheel set and hydraulic uprights to adjust the assembly gap of the steel pipe lining in the curved section, realize pipe climbing and position adjustment, and solve the problem of installation efficiency of large-diameter steel pipes in curved tunnels.

[0025] 4) This invention developed a quick-closing formwork technology for segmented and phased concrete pouring. Using quick-closing formwork as segmented templates, concrete is poured in phases, and a counterweight trolley effectively prevents the internal support steel pipes from floating, thus better controlling the quality of the concrete and shortening the construction period for filling the concrete. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the horizontal assembly frame structure in this invention;

[0027] Figure 2 This is a schematic diagram of the horizontal assembly frame structure after hoisting the inner steel pipe in this invention;

[0028] Figure 3 This is a top view of the horizontal assembly frame structure system in this invention;

[0029] Figure 4 This is a schematic diagram of the internally supported steel structure in this invention;

[0030] Figure 5 This is a schematic diagram of the operation of the transfer trolley in this invention;

[0031] Figure 6 In this invention Figure 5 AA cross-section view;

[0032] Figure 7 This is a schematic diagram of the tunnel curved section transfer trolley climbing pipe in this invention;

[0033] Figure 8 This is a schematic diagram of the connection of the inner lining steel pipes in the curved section of the tunnel in this invention;

[0034] Figure 9 This is a schematic diagram of the installation position of the assembled limiting block in this invention;

[0035] Figure 10 This is a schematic diagram of the installation position of the prefabricated limiting plate in this invention;

[0036] Figure 11 This is a schematic diagram of the installation of the electric hoist with special nodes in this invention;

[0037] Figure 12 This is a schematic diagram of the operation of the ballast trolley in this invention;

[0038] Figure 13 This is a schematic diagram of the installation location of the quick-closing mesh in this invention.

[0039] In the diagram: 1-Ring buckle; 2-Roller; 3-Limiting base; 4-Limiting arm; 5-Adapter arm; 6-Elastic base; 7-Horizontal assembly frame; 8-Built-in drive motor; 9-Conveyor belt; 10-Railway; 11-Inner steel pipe lining; 12-Auxiliary limiting rope; 13-Connecting bolt hole; 14-Inner support steel; 15-Anchor bolt; 16-Support rod support; 17-Adjustable support rod; 18-Rubber pad; 19-Assembled limiting block; 20-Transfer trolley; 21-Guide wheel assembly; 22-Auxiliary wheel assembly; 23-Hydraulic 24-Upright pole; 25-Following wheel assembly; 26-Transverse slide rail; 27-Transverse connecting rod; 28-Assembled limit plate; 29-Installed inner steel pipe; 30-Limit plate base; 31-Anchor point; 32-Top electric hoist; 33-Reinforced concrete segment; 34-Side electric hoist; 35-Temporary operating trolley; 36-First concrete pour; 37-Second concrete pour; 38-Grouting hole; 39-Balancing trolley; 40-Balancing water-filled bladder; 41-Quick and easy-to-close mesh. Detailed Implementation

[0040] The present invention will be further described below with reference to embodiments. The description of the embodiments below is only for the purpose of helping to understand the present invention. It should be noted that those skilled in the art can make several modifications to the present invention without departing from the principle of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0041] Example 1

[0042] As one example, this construction method for the curved section of a water diversion tunnel lined with steel pipes includes the following steps:

[0043] S1. Assembly of horizontal stiffening ring for inner steel pipe 11: After the longitudinal seam welding of the steel pipe coil is completed, the limiting arm 4 of the horizontal assembly jig 7 is opened with manual assistance, and the inner steel pipe 11 is hoisted onto the conveyor belt 9 of the horizontal assembly jig 7. The auxiliary limiting rope 12 is installed through the ring buckle 1, and then the stiffening ring is welded. During the welding process, the conveyor belt 9 can be electrically controlled to realize the flipping welding of the inner steel pipe 11. After the welding of multiple stiffening rings is completed, the inner steel pipe 11 is carried away by a mobile trolley.

[0044] S2. Transfer of inner steel pipe 11 to construction site: Before the transfer of inner steel pipe 11, inner support steel 14 is installed at the prefabrication site using built-in flange rings at both ends. All adjustable support rods 17 set on inner support steel 14 are made to abut against the inner wall of inner steel pipe 11, and the included angle between all adjustable support rods 17 and inner support steel 14 is equal. After the inner support steel 14 is installed, the steel inner lining pipe is transferred to the construction site by transport vehicle.

[0045] S3. Transfer and installation of inner lining steel pipe 11 in curved section of tunnel: The inner lining steel pipe 11 in curved section is pre-set with a bidirectional wedge shape according to different conditions. After the inner lining steel pipe 11 is hoisted into the starting shaft, it is transported and installed section by section to the receiving shaft by the transfer trolley 20. The inner lining steel pipe 11 in the tunnel is climbed and its position is adjusted by the transfer trolley 20, and high-precision docking connection is achieved by the prefabricated limit plate 27 and limit block.

[0046] S4. Special node inner lining steel pipe 11 segmented circular assembly welding: For the inner lining steel pipe 11 in the variable diameter section, three segments are segmented circular assembly welding. Anchor points 30 are set in advance in the reinforced concrete pipe segment 32 of the tunnel. Electric hoists are installed at the top and sides of the tunnel through the anchor points 30. The bottom inner lining pipe segment, the upper left inner lining pipe segment and the upper right inner lining pipe segment are segmented circular assembly welding operation in sequence using three electric hoists and temporary operating trolley 34.

[0047] S5. Segmented and phased pouring of outer concrete: The outer concrete of the inner steel pipe 11 is poured in three layers in segments, with each segment consisting of four to six sections of the inner steel pipe 11. Quick-closing mesh 41 is used as the segmented pouring template. Before pouring the concrete, a counterweight trolley 39 is set up inside the inner steel pipe 11 to prevent the steel pipe from floating.

[0048] Example 2

[0049] As another embodiment, this second embodiment proposes a more specific method for installing the curved section of a water diversion tunnel with an inner steel pipe lining, based on the first embodiment:

[0050] like Figure 1 , Figure 2 As shown, in step S1, the horizontal assembly frame 7 is mainly composed of a built-in drive motor 8, a conveyor belt 9 and a limiting arm 4. The built-in drive motor 8 is symmetrically arranged and connected by the conveyor belt 9. A limiting base 3 and an elastic base 6 are symmetrically arranged on the top. The limiting base 3 is connected to the limiting arm 4. The limiting arm 4 is equipped with a roller 2 and a ring buckle 1. The limiting arm 4 is connected to the elastic base 6 through a transition arm 5.

[0051] like Figure 3 As shown, every two horizontal assembly jigs 7 are installed on the track 10 at intervals, and the spacing can be adjusted according to the length of the inner steel pipe 11.

[0052] like Figure 4 As shown, in step S2, two sets of strut supports 16 are symmetrically arranged on the upper and lower sides of the inner support steel 14. The strut supports 16 are connected to adjustable struts 17, and rubber pads 18 are provided at the ends of the adjustable struts 17.

[0053] like Figure 5As shown, in step S3, the transfer trolley 20 is symmetrically arranged with four sets of wheels on the left and right sides. The front part has a set of guide wheels 21 and a set of auxiliary wheels 22, and the rear part has two sets of auxiliary wheels 22. The surface of the transfer trolley 20 is provided with two transverse slide rails 25.

[0054] like Figure 6 As shown, each transverse slide rail 25 is symmetrically provided with hydraulic uprights 23, and each hydraulic upright 23 is provided with a follower wheel set 24 at the top. The follower wheel sets 24 are connected by transverse connecting rods 26.

[0055] like Figure 10 As shown, the prefabricated limiting plate 27 is vertically welded to the limiting plate base 29, with the spacing being the same as the width of the prefabricated limiting block 19. The limiting plate base 29 is fixed to the top of the built-in flange ring of the installed inner support steel pipe by anchor bolts 15.

[0056] like Figure 9 As shown, the prefabricated limiting block 19 is set on the inner support steel pipe to be installed. The inside is a hollow threaded structure, and it is fixed to the top of the built-in flange ring by anchor bolts 15.

[0057] like Figure 12 As shown, in step S5, grouting holes 38 are provided at the top and both sides of the inner steel pipe 11.

[0058] The ballast trolley 39 is equipped with a ballast water-filled bladder 40.

[0059] It should be noted that the parts in this embodiment that are the same as or similar to those in Embodiment 1 can be referred to each other, and will not be repeated in this application.

[0060] Example 3

[0061] As another embodiment, this third embodiment is proposed based on embodiments one and two, such as... Figures 3 to 13 As shown, this installation system for the curved section of a water diversion tunnel with an inner steel pipe includes: an inner steel pipe 11 and a transport trolley 20 for climbing the pipe inside the tunnel and for assisting in the docking of the inner steel pipe 11.

[0062] Both ends of the inner steel pipe 11 are fitted with inner support steel sections 14 via flanges. The inner support steel sections 14 abut against the inner wall of the inner steel pipe 11 via adjustable support rods 17. Two sets of support rod supports 16 are symmetrically arranged on the upper and lower sides of the inner support steel sections 14. The support rod supports 16 are connected to adjustable support rods 17. The ends of the adjustable support rods 17 are equipped with rubber gaskets 18. All the adjustable support rods 17 on the inner support steel sections 14 abut against the inner wall of the inner steel pipe 11, and the included angle between all the adjustable support rods 17 and the inner support steel sections 14 is equal.

[0063] The transfer trolley 20 is equipped with wheel sets at its bottom and two transverse slide rails 25 on its surface. Hydraulic uprights 23 are mounted on the transverse slide rails 25 to support the inner steel pipe 11. The inner steel pipe 11 moves laterally as the hydraulic uprights 23 move along the transverse slide rails 25. Specifically, the transfer trolley 20 has four sets of wheels symmetrically arranged on its left and right sides. The middle of the transfer trolley 20 is located inside the inner steel pipe 11, with the front and rear sections extending from both ends of the inner steel pipe 11. The front of the transfer trolley 20 has one set of guide wheels 21 and one set of auxiliary wheels 22, and the rear has two sets of auxiliary wheels 22. The transfer trolley 20 has two transverse slide rails 25 on its surface, and hydraulic uprights 23 are symmetrically arranged on each transverse slide rail 25. Follower wheels 24 are mounted on the top of the hydraulic uprights 23, and the follower wheels 24 are connected by transverse connecting rods 26. The follower wheels 24 abut against the inner wall of the top of the inner steel pipe 11.

[0064] Prefabricated limiting plates 27 and prefabricated limiting blocks 19 are respectively installed on the flanges fixed at both ends of the inner lining steel pipe 11. Adjacent inner lining steel pipes 11 are connected by inserting the prefabricated limiting plates 27 and prefabricated limiting blocks 19.

[0065] Two prefabricated limiting plates 27 are vertically welded to a limiting plate base 29. The distance between the two prefabricated limiting plates 27 is the same as the width of the prefabricated limiting block 19. The limiting plate base 29 is fixed to the top of the built-in flange ring at the tail end of the installed inner lining steel pipe 28 by anchor bolts 15. The prefabricated limiting block 19 is fixed to the top of the built-in flange ring at the first section of the inner lining steel pipe 11 to be installed by anchor bolts 15. After the two sections of inner lining steel pipe 11 are joined together, the prefabricated limiting block 19 is inserted between the prefabricated limiting plates 27.

[0066] Example 4

[0067] As another embodiment, this embodiment four proposes a more specific installation system for the curved section of the water diversion tunnel with inner steel pipe, based on embodiment three, and also includes a horizontal assembly jig 7 for flipping the inner steel pipe 11 to weld the stiffening ring.

[0068] like Figure 1 and Figure 2As shown, a track 10 is provided on the construction ground. Two horizontal assembly jigs 7 are installed on the track 10 at intervals to adjust the spacing between two longitudinally adjacent sets of horizontal assembly jigs 7 and the corresponding length of the inner steel pipe 11. The horizontal assembly jig 7 includes a built-in drive motor 8, a conveyor belt 9, and a limiting arm 4. The built-in drive motors 8 are symmetrically arranged on both sides and connected by the conveyor belt 9. The top of the horizontal assembly jig 7 is symmetrically provided with a limiting base 3 and an elastic base 6. The limiting base 3 is connected to the limiting arm 4. The limiting arm 4 is provided with a roller 2 and a ring buckle 1. The limiting arm 4 is connected to the elastic base 6 through a transition arm 5. The inner steel pipe 11 is placed on the conveyor belt 9 of the horizontal assembly jig 7. An auxiliary limiting rope 12 is installed between the ring buckles 1. When the conveyor belt 9 rotates, the inner steel pipe 11 flips.

[0069] like Figures 9 to 13 As shown, when the inner lining steel pipe 11 is located in the variable diameter section, the inner lining steel pipe 11 is divided into three parts: the bottom inner lining pipe segment, the upper left inner lining pipe segment, and the upper right inner lining pipe segment. Anchor points 30 are set on the top and both sides of the reinforced concrete pipe segment 32 of the variable diameter section tunnel. Electric hoists are installed on the top and both sides of the reinforced concrete pipe segment 32 through the anchor points 30. A temporary operating trolley 34 is provided inside the reinforced concrete pipe segment 32 for the assembly and welding of the bottom inner lining pipe segment, the upper left inner lining pipe segment, and the upper right inner lining pipe segment.

[0070] The concrete encasing of the inner steel pipe 11 from bottom to top includes the first concrete pour 35, the second concrete pour 36, and the third concrete pour 37. The length of each section during the concrete encasing pour is four to six sections of the inner steel pipe 11. The two ends of the section are made of quick-closing mesh 41 as the pouring template. Grouting holes 38 are opened at the top and the waistline positions on both sides of the inner steel pipe 11. A counterweight trolley 39 is installed inside the inner steel pipe 11, and a counterweight water-filled bag 40 is installed on the counterweight trolley 39 to prevent the inner steel pipe 11 from floating.

[0071] It should be noted that the parts in this embodiment that are the same as or similar to those in Embodiment 3 can be referred to each other, and will not be repeated in this application.

[0072] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

Claims

1. A method for installing a curved section of a water diversion tunnel with an inner steel pipe lining, characterized in that, Includes the following steps: S1. Open the limiting arm of the horizontal assembly jig and hoist the inner lining steel pipe onto the conveyor belt of the horizontal assembly jig. The conveyor belt controls the rotation of the inner lining steel pipe and welds the stiffening ring. The horizontal assembly jig includes a built-in drive motor, a conveyor belt, and a limiting arm. The built-in drive motor is symmetrically arranged and connected to the conveyor belt. A limiting base and an elastic base are symmetrically arranged on the top. A limiting arm is connected to the limiting base. The limiting arm is equipped with rollers and ring buckles. The limiting arm is connected to the elastic base through an adapter arm. Open the limiting arm of the horizontal assembly jig and hoist the inner lining steel pipe onto the conveyor belt of the horizontal assembly jig. Install the auxiliary limiting rope through the ring buckle. Then weld the stiffening ring. The electric control of the conveyor belt realizes the rotation and welding of the inner lining steel pipe. After the welding of multiple stiffening rings is completed, use a mobile trolley to carry the inner lining steel pipe away. S2. The inner lining steel pipe is fitted with flange rings at both ends to install the inner support steel. All adjustable struts on the inner support steel are in contact with the inner wall of the inner lining steel pipe. The inner support steel is symmetrically equipped with two sets of strut supports, and the strut supports are connected to adjustable struts. The ends of the adjustable struts are equipped with rubber gaskets. All adjustable struts on the inner support steel are in contact with the inner wall of the inner lining steel pipe. The included angle between all adjustable struts and the inner support steel is equal. After the inner support steel is installed, the inner lining steel pipe is transported to the construction site by a transport vehicle. S3. After the inner lining steel pipe is hoisted into the launching shaft, a transfer trolley is used to climb the pipe and adjust its position. Adjacent inner lining steel pipes are connected using prefabricated limiting plates and blocks. The curved sections of the inner lining steel pipe are pre-set with a bidirectional wedge shape according to different conditions. After the inner lining steel pipe is hoisted into the launching shaft, it is transported and installed segment by segment towards the receiving shaft using the transfer trolley. The transfer trolley has four sets of wheels symmetrically arranged on the left and right sides. The middle of the transfer trolley is located inside the inner lining steel pipe, with the front and rear sections extending from both ends of the inner lining steel pipe. The front of the transfer trolley has one set of guide wheels and one set of auxiliary wheels, while the rear has two sets of auxiliary wheels. The surface of the transfer trolley is equipped with two transverse slide rails, each with a hydraulic upright symmetrically arranged on the left and right sides. Follower wheels are installed at the top of the hydraulic uprights. The follower wheel sets are connected by a transverse connecting rod. The follower wheel sets abut against the top inner wall of the inner lining steel pipe to support the inner lining steel pipe. When the hydraulic upright moves along the transverse slide rail, the inner lining steel pipe moves laterally. The inner lining steel pipe in the tunnel is climbed and its position adjusted by a transfer trolley. The inner lining steel pipe in the tunnel is connected by assembled limit plates and assembled limit blocks. The two assembled limit plates are vertically welded with limit plate bases. The spacing between the assembled limit plates is the same as the width of the assembled limit blocks. The limit plate bases are fixed to the top of the built-in flange ring at the tail end of the installed inner lining steel pipe by anchor bolts. The assembled limit blocks are fixed to the top of the built-in flange ring at the first section of the inner lining steel pipe to be installed by anchor bolts. After the two sections of inner lining steel pipe are connected, the assembled limit blocks are inserted between the assembled limit plates. S4. For the inner lining steel pipe in the variable diameter section, three pieces are joined together and welded. Electric hoists are installed on the top and both sides of the reinforced concrete pipe segment to carry out the three-piece joining and welding operation. S5. Pour concrete into sections from bottom to top, lining the steel pipes with the outer layer of concrete.

2. The method for installing a curved section of a water diversion tunnel with an inner steel pipe lining according to claim 1, characterized in that, In step S1, a track is provided on the construction ground, and two horizontal assembly jigs are installed on the track at intervals. The distance between two adjacent sets of horizontal assembly jigs in the longitudinal direction is adjusted according to the length of the inner steel pipe.

3. The method for installing a curved section of a water diversion tunnel with an inner steel pipe lining according to claim 1, characterized in that, In step S4, the inner lining steel pipe in the variable diameter section is assembled and welded in three pieces. The inner lining steel pipe is divided into three pieces: the bottom inner lining pipe piece, the upper left inner lining pipe piece, and the upper right inner lining pipe piece. Anchor points are set in advance in the reinforced concrete pipe piece. Electric hoists are installed on the top and both sides of the reinforced concrete pipe piece through the anchor points. The bottom inner lining pipe piece, the upper left inner lining pipe piece, and the upper right inner lining pipe piece are assembled and welded in sequence using three electric hoists and a temporary operating trolley.

4. The method for installing a curved section of a water diversion tunnel with an inner steel pipe lining according to claim 1, characterized in that, In step S5, the concrete surrounding the inner steel pipe is poured in three layers in sections, with each section consisting of four to six sections of the inner steel pipe. Quick-closing mesh is used as the formwork for each section. Grouting holes are provided at the top and both sides of the inner steel pipe.

5. The method for installing a curved section of a water diversion tunnel with an inner steel pipe lining according to claim 1, characterized in that, In step S5, a ballast trolley is installed inside the inner steel pipe before pouring concrete, and a ballast water-filled bag is installed on the ballast trolley.

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