Variable cross-section large-span tunnel rapid transition construction device and method

Abstract

This invention relates to the field of tunnel maintenance, and more particularly to a rapid transition construction device and method for large-span tunnels with variable cross-sections. The technical problem is that the water sprayed from the water pipe experiences uneven force on different areas of the tunnel, and the spray angle and range of the water spraying device are limited. The technical solution is: a rapid transition construction device for large-span tunnels with variable cross-sections, including a water truck, an electric telescopic rod I, and a bearing ring; the water truck has several water tanks, all of which are equipped with connecting pipes, and a pump is installed inside each tank; the electric telescopic rod I is installed on the water truck, and the telescopic part of the electric telescopic rod I is rotatably connected to a connecting block; the connecting block is rotatably connected to a bearing ring. This invention, by adding a hollow ring, a nozzle II, and a flexible buckle to the through-hole II of the water pipe II, allows the water flow to be sprayed onto the tunnel through the through-hole II. Due to the restriction of the flexible buckle, the impact force of the water flow is applied to the flexible buckle, causing the nozzle II to move upwards, thereby weakening the impact force of the water flow and preventing wear on the tunnel.

Description

Technical Field

[0001] This invention relates to the field of tunnel maintenance, and in particular to a rapid transition construction device and method for large-span tunnels with variable cross-sections. Background Technology

[0002] After the basic construction of the tunnel is completed, it needs to be maintained before it can be used. During the maintenance of the tunnel, the maintenance effect is achieved by manually holding a water hose to flush the tunnel, and at the same time, the maintenance work is carried out by using a water spraying device to flush the tunnel.

[0003] The following problems exist during tunnel maintenance;

[0004] During the maintenance of the tunnel by manually holding water pipes, the water sprayed from the pipes exerts uneven force on the areas of the tunnel being scourd, and the water sprayed from the pipes can easily damage the tunnel, thereby compromising the construction quality of the tunnel and requiring repairs to the damaged areas, which in turn affects the progress of the tunnel.

[0005] During the maintenance of tunnels using sprinkler systems, the limited spray angle and range of the sprinkler system restrict its effectiveness. Furthermore, the spray angle also limits the ability of the sprinkler system to achieve a flush spray pattern with the tunnel, resulting in the aforementioned problems persisting. Summary of the Invention

[0006] To overcome the shortcomings of uneven stress on tunnel scour caused by water jets from pipes and the limited spray angle and range of water spraying devices, this invention provides a rapid transition construction device and method for large-span tunnels with variable cross-sections.

[0007] The technical solution is as follows: A rapid transition construction device for a variable cross-section, large-span tunnel, comprising a water truck, an electric telescopic rod I, a bearing ring, and a water pipe I; the water truck has several water tanks, all of which are equipped with connecting pipes, and a pump is installed inside each water tank; the electric telescopic rod I is mounted on the water truck, and a connecting block is rotatably connected to the telescopic part of the electric telescopic rod I; the bearing ring is rotatably connected to the connecting block; the water pipe I is slidably connected to the bearing ring, and several through holes I are opened on the water pipe I; it also includes a water pipe II. Connecting seat, connecting column, and retractor; Water pipe I is slidably connected to water pipe II, and water pipe I is connected to water pipe II. Water pipe II has several through holes II. A connecting seat is fixed to the right side of water pipe I. A connecting seat is fixed to the left side of water pipe II. Each connecting seat is rotatably connected to a pulley. A connecting column is fixed to the left connecting seat, and the connecting column is fixed to water pipe II. A retractor is fixed to the right side of the waterwheel. A thin rope is wound on the retractor, and the other end of the thin rope passes through the right connecting seat and is fixed to the connecting column.

[0008] As an improvement to the above solution, all connecting seats are equipped with pulleys.

[0009] As an improvement to the above scheme, it also includes nozzle I and buffer ball I; each of the through holes I on the water pipe I is provided with a nozzle I; and each of the nozzles I is connected to several buffer balls I by ropes.

[0010] As an improvement to the above scheme, it also includes a mounting bracket I and a buffer ball II; each of the nozzles I is fixedly connected to a mounting bracket I; each mounting bracket I is slidably connected to a buffer ball II, and each buffer ball II is connected to a rope of the corresponding buffer ball I.

[0011] As an improvement to the above scheme, it also includes a hollow ring, nozzle II, and a flexible buckle; a hollow ring is fixedly connected to all the through holes II of the water pipe II; a nozzle II is slidably connected inside each of the hollow rings; and a flexible buckle is fixedly connected inside each of the nozzles II.

[0012] As an improvement to the above scheme, it also includes a push column and a pull bar; the waterwheel has a slot; the push column is slidably connected to the waterwheel, and the push column is fixed to the left side and the connecting seat through a connecting rope. The bottom of the push column has several protrusions; the protrusions are equipped with pull bars, one end of the pull bar is fixed to the electric telescopic rod I, and the other end of the pull bar is slidably connected to the waterwheel. A spring for resetting is provided at the slidable connection between the pull bar and the waterwheel, and the pull bar cooperates with the protrusions.

[0013] As an improvement to the above scheme, it also includes spring limit brackets; the right side of water pipe I is provided with several two-limit points; the right side of the connecting column is fixed with several two-spring limit brackets, and all the spring limit brackets cooperate with the corresponding limit points.

[0014] As an improvement to the above scheme, a positioning component is also included; the positioning component is installed on the waterwheel; the positioning component includes a mounting frame II, a rotating frame, an electric telescopic rod II, a positioning frame, and an electric tilting frame; the mounting frame II is fixedly connected to the waterwheel; the rotating frame is installed on the mounting frame II; the electric telescopic rod II is installed on the rotating frame; the positioning frame is fixedly connected to the telescopic part of the electric telescopic rod II; several electric tilting frames are fixedly connected to the electric telescopic rod II, and the telescopic parts of all electric tilting frames are rotatably connected to the positioning frame.

[0015] As an improvement to the above solution, the positioning component also includes a limiting post; the pushing post and the connecting block are jointly fixed to the limiting post, and a cylinder in the middle of the limiting post is slidably connected on the rotating frame.

[0016] As an improvement to the above scheme, a rapid transition construction method for a variable cross-section, long-span tunnel includes the following steps: Step 1: First, replenish sufficient water into the water tank of the water truck; Step 2: Control the electric telescopic rod I to extend to the designated height, and the bearing ring, water pipe I, water pipe II, connecting seat, and connecting column follow and move upward to the designated height, at which point the pulley presses on the tunnel; Step 3: Manually pull water pipe II out of water pipe I; Step 4: Start the pump in the water tank of the water truck to deliver water to water pipe I and water pipe II, and begin the tunnel maintenance work; Step 5: After the tunnel maintenance is completed, use the retractor to wind up the thin rope and pull the connecting column to the right, and water pipe II follows and returns to water pipe I.

[0017] Beneficial effects: This invention allows water to be sprayed onto the tunnel through the through-hole 2 on water pipe 2 by manually pulling water pipe 2 out from water pipe 1, thereby increasing the spray range on the tunnel and improving the efficiency of tunnel maintenance.

[0018] This invention uses a buffer ball I to block the water flow. When the rope connecting the buffer ball I starts to sway, the buffer ball I sways accordingly. The water flow is blocked by the buffer ball I, changing the position of the water jet and weakening the impact of the water flow on the tunnel. This reduces the wear and tear on the tunnel, keeping the wear within acceptable limits and avoiding any impact on the tunnel's construction quality.

[0019] This invention utilizes a buffer ball II mounted on a mounting frame I, which is fixedly connected to a rope connecting the buffer balls I. Furthermore, a height difference is established between all the buffer balls I. When water flows over the buffer balls I and II, they pull on each other via the connecting rope, causing their positions to continuously change, thus ensuring the buffer balls I and II effectively reduce the impact of the water flow.

[0020] This invention adds a hollow ring, a nozzle II, and a flexible buckle to the through hole II of the water pipe II. When water is sprayed from the through hole II of the water pipe II onto the tunnel, the impact force of the water flow is applied to the flexible buckle due to the restriction of the flexible buckle, which drives the nozzle II to move upward. This reduces the impact force of the water flow and avoids wear on the tunnel.

[0021] This invention utilizes an electric telescopic rod II to extend the positioning frame and an electric tilting frame. When the positioning frame contacts the connection between water pipe II and water pipe I, it pushes the connection, providing support. By adjusting the tilting angle of the electric tilting frame, the positioning frame begins to deform, adjusting it to a suitable curvature. This allows the positioning frame to better fit the connection between water pipe II and water pipe I, preventing any impact on tunnel maintenance.

[0022] This invention achieves this by setting a cylinder in the middle of the limiting column and slidingly connecting it to the rotating frame. When the pushing column is pushed out to the left and the electric telescopic rod I is pushed out to the upward, the rotating frame is driven to adjust its angle, so that the pushing column and the electric telescopic rod I are always 45 degrees apart from the rotating frame, ensuring that the support effect at the connection between water pipe II and water pipe I is not affected. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the rapid transition construction device for variable cross-section large-span tunnels disclosed in this invention.

[0024] Figure 2 This is a partial structural cross-sectional view of the rapid transition construction device for variable cross-section large-span tunnels disclosed in this invention.

[0025] Figure 3 This is a second partial structural cross-sectional view of the rapid transition construction device for variable cross-section large-span tunnels disclosed in this invention;

[0026] Figure 4 This is a schematic diagram of the nozzle I, mounting frame I, buffer ball I, buffer ball II, and spring limiting frame of the rapid transition construction device for large-span tunnels of the present invention;

[0027] Figure 5 This is a schematic diagram of the hollow ring, nozzle II, and soft buckle structure of the rapid transition construction device for large-span tunnels with variable cross-section disclosed in this invention.

[0028] Figure 6 This is a schematic diagram of the push column and pull bar of the rapid transition construction device for large-span tunnels with variable cross-section disclosed in this invention.

[0029] The labels in the diagram are as follows: 1-Waterwheel, 2-Electric telescopic rod I, 3-Bearing ring, 4-Water pipe I, 5-Water pipe II, 6-Connecting seat, 7-Connecting column, 8-Retractor, 101-Nozzle I, 102-Mounting frame I, 103-Buffer ball I, 104-Buffer ball II, 105-Spring limit frame, 110-Hollow ring, 111-Nozzle II, 112-Soft buckle, 201-Pushing column, 202-Pull bar, 210-Mounting frame II, 211-Rotating frame, 212-Electric telescopic rod II, 213-Positioning frame, 214-Electric tilting frame, 215-Limiting column, 1a-Empty groove, 2a-Connecting block, 4a-Limiting point, 6a-Pulley, 201a-Protrusion. Detailed Implementation

[0030] The above-described solution will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of this application. The implementation conditions used in the embodiments may be further adjusted according to the conditions of specific manufacturers, and the implementation conditions not specified are generally those in routine experiments.

[0031] Example 1

[0032] A rapid transition construction device for variable cross-section, long-span tunnels, such as... Figure 1-4 As shown, it includes a waterwheel 1, an electric telescopic rod I2, a bearing ring 3, and a water pipe I4; the waterwheel 1 has two water tanks, and all the water tanks are equipped with connecting pipes, and a pump is installed in the water tank; the electric telescopic rod I2 is installed on the waterwheel 1, and the telescopic part of the electric telescopic rod I2 is rotatably connected to a connecting block 2a; the connecting block 2a is rotatably connected to the bearing ring 3; the water pipe I4 is slidably connected to the bearing ring 3, and the water pipe I4 has several through holes I;

[0033] It also includes a water pipe II 5, a connecting seat 6, a connecting post 7, and a retractor 8; the water pipe I 4 is slidably connected to the water pipe II 5, the water pipe I 4 and the water pipe II 5 are connected, and the water pipe II 5 has several through holes II; the connecting seat 6 is fixedly connected to the right side of the water pipe I 4; the connecting seat 6 is fixedly connected to the left side of the water pipe II 5, and each of the connecting seats 6 is rotatably connected to a pulley 6a; the connecting post 7 is fixedly connected to the left connecting seat 6, and the connecting post 7 is fixedly connected to the water pipe II 5; the retractor 8 is fixedly connected to the right side of the waterwheel 1, and a thin rope is wound on the retractor 8, and the other end of the thin rope passes through the right connecting seat 6 and is fixedly connected to the connecting post 7.

[0034] All connecting seats 6 are equipped with pulleys 6a to maintain a suitable distance between water pipe I4, water pipe II5, and the tunnel.

[0035] Before using this invention, water is transported to the water tank of water truck 1 through a connecting pipe. When the water level in the water tank of water truck 1 reaches a designated position, the water supply is stopped, and the electric telescopic rod I2 is pushed out to a designated height. The bearing ring 3, water pipe I4, water pipe II5, connecting seat 6, and connecting column 7 then move upward to the designated height. At this time, the pulley 6a presses against the tunnel, causing the pulley 6a to roll on the tunnel, facilitating the spraying of water from water pipes I4 and II5 onto the tunnel. Simultaneously, the pulley 6a is used for positioning, ensuring that water pipes I4, II5, and the tunnel are aligned. A suitable distance is needed to better adjust the water pressure in water pipes I4 and II5, preventing water sprayed from I4 and II5 from damaging the tunnel. The water tank of water truck 1 is connected to water pipes I4 and II5 through an external pipeline. The pump in the water tank of water truck 1 is started to transport water to water pipes I4 and II5 to begin the tunnel maintenance work. After the water in the water tank of water truck 1 is transferred to water pipe II5, the water is transferred from through hole II of water pipe II5 to through hole I of water pipe I4. Then the water is sprayed out of through hole I of water pipe I4 onto the tunnel to carry out the tunnel maintenance work.

[0036] During tunnel maintenance, considering the limited spraying range of water pipe I4, which cannot evenly spray water onto the tunnel, thus affecting the efficiency of tunnel maintenance, the pump is stopped to deliver water. The electric telescopic rod I2 is then controlled to move the connected parts downwards. Water pipe II5 is then manually pulled out of water pipe I4, allowing water to spray onto the tunnel through the through hole II on water pipe II5. This increases the spraying range and improves the efficiency of tunnel maintenance. After the tunnel maintenance is completed, the retractor 8 rewinds the thin rope and pulls the connecting column 7 to the right, causing water pipe II5 to move back into water pipe I4.

[0037] Example 2

[0038] Based on Example 1, such as Figures 4-5 As shown, it also includes nozzle I101 and buffer ball I103; each of the through holes I on the water pipe I4 is provided with a nozzle I101; each of the nozzles I101 is connected to four buffer balls I103 by ropes.

[0039] It also includes mounting bracket I102 and buffer ball II104; each of the nozzles I101 is fixedly connected to a mounting bracket I102; each mounting bracket I102 is slidably connected to a buffer ball II104, and each buffer ball II104 is connected to a rope of the corresponding buffer ball I103.

[0040] There is a height difference between all the buffer balls I103, which allows the position of the buffer balls I103 to be continuously changed.

[0041] It also includes a hollow ring 110, a nozzle II 111, and a flexible buckle 112; a hollow ring 110 is fixedly connected to all the through holes II of the water pipe II 5; a nozzle II 111 is slidably connected inside each of the hollow rings 110; and a flexible buckle 112 is fixedly connected inside each of the nozzles II 111.

[0042] During tunnel maintenance, although adjusting the distance between water pipes I4 and II5 and the tunnel, and controlling the water pressure, can prevent water spray from damaging the tunnel, direct water spraying onto the tunnel can still cause wear and affect the tunnel's construction quality. Therefore, a nozzle I101 and a buffer ball I103 are used on water pipe I4. As the water is sprayed from water pipe I4 onto the tunnel, it passes through these two points. When passing through nozzle I101, the water forms a stream and continues to spray onto the tunnel. When the water stream passes through buffer ball I103, the buffer ball I103 blocks the water flow. The rope connecting buffer ball I103 begins to sway, and the buffer ball I103 sways accordingly. The water flow is blocked by the buffer ball I103, changing the spray position and weakening the impact of the water flow on the tunnel. This reduces wear and keeps the tunnel wear within acceptable limits, preventing any impact on the tunnel's construction quality.

[0043] Considering that after the buffer ball I103 blocks the water flow, when the impact of the water flow on the buffer ball I103 stabilizes, the position of the buffer ball I103 becomes fixed, and the effect of weakening the water flow is affected, at this time, the buffer ball II104 on the mounting bracket I102 is fixed to the rope connecting the buffer ball I103. At the same time, the height of all the buffer balls I103 is set to have a drop. When the water flow washes over the buffer balls I103 and the buffer ball II104, the buffer balls I103 and the buffer ball II104 pull each other through the connecting rope, and the positions of the buffer balls I103 and the buffer ball II104 will continuously change, ensuring the effect of the buffer balls I103 and the buffer ball II104 in weakening the impact of the water flow.

[0044] Considering that the water flow from water pipe II5 is not weakened after being pulled out of water pipe I4, and will still cause wear to the tunnel, a hollow ring 110, a nozzle II111, and a flexible buckle 112 are added to the through hole II of water pipe II5. When the water flow is sprayed from the through hole II of water pipe II5 onto the tunnel, the impact force of the water flow is applied to the flexible buckle 112 due to the restriction of the flexible buckle 112, which drives the nozzle II111 to move upward, thereby weakening the impact force of the water flow and avoiding wear to the tunnel.

[0045] Example 3

[0046] Based on Example 2, such as Figures 2-6As shown, it also includes a push column 201 and a pull bar 202; the waterwheel 1 has a slot 1a; the push column 201 is slidably connected to the waterwheel 1, and the push column 201 is fixed to the left side and the connecting seat 6 through a connecting rope. The bottom of the push column 201 is provided with several protrusions 201a; the pull bar 202 is provided in the protrusions 201a, one end of the pull bar 202 is fixedly connected to the electric telescopic rod I2, and the other end of the pull bar 202 is slidably connected to the waterwheel 1. A spring is provided at the slidable connection between the pull bar 202 and the waterwheel 1, and the pull bar 202 cooperates with the protrusions 201a.

[0047] It also includes a spring limit bracket 105; the right side of the water pipe I4 is provided with several two-limit points 4a; the right side of the connecting column 7 is fixed with several two-spring limit brackets 105, and all the spring limit brackets 105 cooperate with the corresponding limit points 4a.

[0048] It also includes a positioning assembly; the positioning assembly is installed on the waterwheel 1; the positioning assembly includes a mounting frame II 210, a rotating frame 211, an electric telescopic rod II 212, a positioning frame 213, and an electric tilting frame 214; the mounting frame II 210 is fixedly connected to the waterwheel 1; the rotating frame 211 is installed on the mounting frame II 210; the electric telescopic rod II 212 is installed on the rotating frame 211; the telescopic part of the electric telescopic rod II 212 is fixedly connected to the positioning frame 213, and the positioning frame 213 can deform; two electric tilting frames 214 are fixedly connected to the electric telescopic rod II 212, and the telescopic parts of all the electric tilting frames 214 are rotatably connected to the positioning frame 213.

[0049] The positioning component also includes a limiting post 215; the pushing post 201 and the connecting block 2a are jointly fixed to the limiting post 215, the limiting post 215 can be deformed, and a cylinder in the middle of the limiting post 215 is slidably connected on the rotating frame 211.

[0050] Considering that manually pulling water pipe II5 out of water pipe I4 during tunnel maintenance is too cumbersome, and also considering that after water pipe II5 is pulled out of water pipe I4, one end of water pipe II5 is unsupported, resulting in a large difference in the distance between water pipe II5 and the tunnel and the distance between water pipe I4 and the tunnel, the water sprayed from water pipes II5 and I4 will be affected and cannot be sprayed effectively onto the tunnel, when the electric telescopic rod I2 is pushed upward, the electric telescopic rod I2 pulls the pulling bar 202, which pushes the protrusion 201a, pushing the column 201 to the left, pushing the column 20... 1. The connecting seat 6 and water pipe II 5 on the left are pulled by the connecting rope. Due to the restriction of the spring limit frame 105, when the push column 201 pulls the water pipe II 5, the water pipe I 4 will slide to the left on the bearing ring 3. When the limit point 4a contacts the bearing ring 3, the spring limit frame 105 is pushed and begins to retract, and the water pipe II 5 is pulled out from the water pipe I 4. At the same time, the water pipe II 5 is pulled to the left by the push column 201, so that one end of the water pipe II 5 is supported. The difference between the distance between the water pipe II 5 and the tunnel and the distance between the water pipe I 4 and the tunnel is reduced, so as to avoid affecting the effect of water spraying out from the water pipe II 5 and the water pipe I 4.

[0051] When the retractor 8 winds up the thin rope and pulls the connecting column 7 to the right, the water pipe II 5 moves back into the water pipe I 4. When the spring limit bracket 105 moves to the limit position 4a, the spring limit bracket 105 is inserted into the limit position 4a again to restore the initial state and complete the reset.

[0052] Considering that although both ends of water pipe II5 and water pipe I4 are supported, after water pipe II5 is pulled out from water pipe I4, due to the overall length of water pipe II5 and water pipe I4, the connection point of water pipe II5 and water pipe I4 is unsupported and prone to sagging, which would affect the maintenance of the tunnel. Therefore, a positioning component is used to support the connection point of water pipe II5 and water pipe I4. First, the rotating frame 211 on the mounting frame II210 is manually adjusted so that it is positioned between the pushing column 201 and the electric telescopic rod I2, with the pushing column 201 and the electric telescopic rod I2 both 45 degrees apart from the rotating frame 211. Then... The positioning frame 213 and the electric tilting frame 214 move as the electric telescopic rod II212 is extended. When the positioning frame 213 contacts the connection between water pipe II5 and water pipe I4, the positioning frame 213 pushes the connection between water pipe II5 and water pipe I4, providing support to the connection. At the same time, the electric tilting frame 214 is rotated. By adjusting the tilting angle of the electric tilting frame 214, the positioning frame 213 begins to deform, adjusting the positioning frame 213 to a suitable curvature. The positioning frame 213 fits better with the connection between water pipe II5 and water pipe I4, avoiding any impact on tunnel maintenance.

[0053] Considering that manually adjusting the rotating frame 211 on the mounting bracket Ⅱ210 is too cumbersome and the adjustment angle is not precise enough, which would affect the support effect at the connection between water pipe Ⅱ5 and water pipe Ⅰ4, a limiting post 215 is set between the pushing post 201 and the connecting block 2a. At the same time, a cylinder is set in the middle of the limiting post 215 and slidably connected to the rotating frame 211. When the pushing post 201 is pushed to the left and the electric telescopic rod Ⅰ2 is pushed upward, the rotating frame 211 is driven to adjust its angle, so that the pushing post 201 and the electric telescopic rod Ⅰ2 are always 45 degrees apart from the rotating frame 211, ensuring that the support effect at the connection between water pipe Ⅱ5 and water pipe Ⅰ4 is not affected.

[0054] A rapid transition construction method for a variable cross-section, long-span tunnel includes the following steps;

[0055] Step 1: First, add enough water to the water tank of water truck 1;

[0056] Step 2: Control the electric telescopic rod I2 to extend to the specified height. The bearing ring 3, water pipe I 4, water pipe II 5, connecting seat 6 and connecting column 7 follow and move upward to the specified height. At this time, pulley 6a presses on the tunnel.

[0057] Step 3: Manually pull water pipe II5 out of water pipe I4;

[0058] Step 4: Start the pump in the water tank of water truck 1 to deliver water to water pipe I4 and water pipe II5 to begin the tunnel maintenance work;

[0059] Step 5: After the tunnel maintenance is completed, use the retractor 8 to wind up the thin rope and pull the connecting column 7 to the right. Water pipe II 5 will follow the movement and return to water pipe I 4.

[0060] The above embodiments are provided for those skilled in the art to implement or use the present invention. Those skilled in the art can make various modifications or changes to the above embodiments without departing from the inventive concept of the present invention. Therefore, the protection scope of the present invention is not limited to the above embodiments, but should be the maximum scope that conforms to the innovative features mentioned in the claims.

Claims

1. A rapid transition construction device for a large-span tunnel with variable cross-section, comprising a water truck (1), an electric telescopic rod I (2), a bearing ring (3), and a water pipe I (4); the water truck (1) has several water tanks, all of which are equipped with connecting pipes, and a pump is installed inside each water tank; the water truck (1) is equipped with an electric telescopic rod I (2), and the telescopic part of the electric telescopic rod I (2) is rotatably connected to a connecting block (2a); the connecting block (2a) is rotatably connected to a bearing ring (3); the bearing ring (3) is slidably connected to a water pipe I (4), and the water pipe I (4) has several through holes I; characterized in that, It also includes water pipe II (5), connecting seat (6), connecting column (7) and retractor (8); water pipe I (4) is slidably connected to water pipe II (5), water pipe I (4) is connected to water pipe II (5), and water pipe II (5) has several through holes II; connecting seat (6) is fixedly connected to the right side of water pipe I (4); connecting seat (6) is fixedly connected to the left side of water pipe II (5), and each connecting seat (6) is rotatably connected to a pulley (6a); connecting column (7) is fixedly connected to the left connecting seat (6), and connecting column (7) is fixedly connected to water pipe II (5); retractor (8) is fixedly connected to the right side of waterwheel (1), and a thin rope is wound on the retractor (8), and the other end of the thin rope passes through the right connecting seat (6) and is fixedly connected to the connecting column (7); It also includes nozzle I (101) and buffer ball I (103); each of the through holes I on the water pipe I (4) is provided with a nozzle I (101); each of the nozzles I (101) is connected to several buffer balls I (103) by ropes. It also includes mounting bracket I (102) and buffer ball II (104); each of the nozzles I (101) is fixedly connected to a mounting bracket I (102); each of the mounting brackets I (102) is slidably connected to a buffer ball II (104), and each of the buffer balls II (104) is connected to the rope of the corresponding buffer ball I (103); It also includes a hollow ring (110), a nozzle II (111) and a soft buckle (112); a hollow ring (110) is fixedly connected to all the through holes II of the water pipe II (5); a nozzle II (111) is slidably connected inside each of the hollow rings (110); a soft buckle (112) is fixedly connected inside each of the nozzles II (111).

2. The variable cross-section large-span tunnel rapid transition construction device according to claim 1, characterized in that, It also includes a push column (201) and a pull bar (202); the waterwheel (1) has a slot (1a); the push column (201) is slidably connected to the waterwheel (1), the push column (201) is fixed to the left side and the connecting seat (6) by a connecting rope, and the bottom of the push column (201) has several protrusions (201a); the protrusions (201a) are provided with a pull bar (202), one end of the pull bar (202) is fixed to the electric telescopic rod I (2), the other end of the pull bar (202) is slidably connected to the waterwheel (1), and the pull bar (202) and the waterwheel (1) are provided with a spring for resetting, and the pull bar (202) cooperates with the protrusions (201a).

3. The variable cross-section large-span tunnel rapid transition construction device according to claim 2, characterized in that, It also includes a spring limit bracket (105); the right side of the water pipe I (4) is provided with several two-position limit points (4a); the right side of the connecting column (7) is fixed with several two-position spring limit brackets (105), and all the spring limit brackets (105) are matched with the corresponding limit points (4a).

4. The rapid transition construction device for a variable cross-section, large-span tunnel according to claim 1, characterized in that, It also includes a positioning component; the waterwheel (1) is equipped with a positioning component; the positioning component includes a mounting frame II (210), a rotating frame (211), an electric telescopic rod II (212), a positioning frame (213) and an electric tilting frame (214); the waterwheel (1) is fixedly connected to the mounting frame II (210); the mounting frame II (211) is installed on the mounting frame II (210); the rotating frame II (211) is installed on the rotating frame (211); the telescopic part of the electric telescopic rod II (212) is fixedly connected to the positioning frame (213); several electric tilting frames (214) are fixedly connected to the electric telescopic rod II (212), and the telescopic parts of all the electric tilting frames (214) are rotatably connected to the positioning frame (213).

5. The variable cross-section large-span tunnel rapid transition construction device according to claim 4, characterized in that, The positioning assembly also includes a limiting post (215); the pushing post (201) and the connecting block (2a) are fixed together to the limiting post (215), and the limiting post (215) has a cylinder in the middle that is slidably connected on the rotating frame (211).

6. A variable cross-section large-span tunnel rapid transition construction method according to any one of claims 1-5, characterized in that, The process includes the following steps: Step 1: Add enough water to the water tank of the water truck (1); Step 2: Control the electric telescopic rod I (2) to push it out to the specified height, and the bearing ring (3), water pipe I (4), water pipe II (5), connecting seat (6) and connecting column (7) move upward to the specified height. At this time, the pulley (6a) presses on the tunnel; Step 3: Manually pull water pipe II (5) out of water pipe I (4); Step 4: Start the pump in the water tank of the water truck (1) to deliver water to water pipe I (4) and water pipe II (5) to start the tunnel maintenance work; Step 5: After the tunnel maintenance is completed, use the retractor (8) to rewind the thin rope and pull the connecting column (7) to the right. Water pipe II (5) moves back into water pipe I (4).

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