A positioning device for assisting in the installation of drainage pipes under the tunnel invert.

Abstract

This application provides a positioning device for assisting in the installation of drainage pipes under the invert of a tunnel. It includes a connecting base, with adjusting mechanisms on both sides of the top of the connecting base for adjusting the height of the water pipe. Each adjusting mechanism includes two grooves respectively located on both sides of the top of the connecting base. A T-shaped frame is installed inside each groove, and a disc is located on both sides of the T-shaped frame for adjusting the water pipe height. By implementing this adjusting mechanism, users can move the discs by pushing an operating lever to lift the support frame and the water pipe on it, adjusting the longitudinal slope of the water pipe. The operation is convenient and does not require replacing Z-shaped steel of different specifications. Furthermore, the rotation of the discs can also drive the vortex disc to rotate, thereby lowering the semi-circular groove and embedding it into the soil, facilitating the installation of the positioning device. The adjusting mechanism not only efficiently adjusts the water pipe height but can also be used for the positioning and installation of the positioning device, demonstrating strong functionality.

Description

Technical Field

[0001] This invention relates to the field of tunnel drainage pipe construction technology, and more specifically, to a positioning device for assisting in the installation of drainage pipes under the tunnel invert. Background Technology

[0002] For highway tunnels, the common drainage method involves setting up a central drainage ditch within the invert arch filling layer as the main drainage channel. However, because the central drainage ditch is located within the tunnel invert arch, it cannot drain water seeping from the bottom of the invert arch. If groundwater is abundant and well-developed around the tunnel, the accumulated water over the years can cause foundation subsidence, leading to cracks in the tunnel invert arch and secondary lining, posing a threat to the safety of highway operations. This is especially true when the tunnel passes through unfavorable geological sections such as the Badong Formation; if the water accumulated under the tunnel invert arch is not drained in time, it can easily lead to tunnel collapse and foundation subsidence.

[0003] According to project requirements, a water pipe needs to be added under the tunnel invert. This water pipe is prefabricated in the factory, with a length of 2m each. The pipe body is a corrosion-resistant reinforced concrete structure, and the upper half of the pipe body has evenly distributed seepage holes. After installation, it is wrapped with non-woven fabric, which can effectively collect seepage water. The existing water pipe positioning brackets mostly adjust the height of the bracket by replacing different specifications of Z-shaped steel, thereby adjusting the longitudinal slope of the pipe. However, adjusting by replacing different specifications of Z-shaped steel is not only inefficient, but also cannot guarantee the longitudinal slope of the pipe.

[0004] For example, the specification of the Chinese invention patent / utility model patent (application number: CN202220495856.0) for "a positioning bracket for building water supply pipes" states that existing water supply pipe positioning brackets are not convenient for height adjustment and cannot accurately connect to pipes; the above patent can corroborate the defects of the prior art.

[0005] Therefore, we have made improvements and proposed a positioning device to assist in the installation of drainage pipes under the tunnel invert. Summary of the Invention

[0006] The purpose of this invention is to address the current method of adjusting the slope of the pipeline by replacing Z-shaped steel of different specifications, which is not only inefficient but also fails to guarantee the longitudinal slope of the pipeline.

[0007] To achieve the above-mentioned objectives, the present invention provides a positioning device for assisting in the installation of drainage pipes under the tunnel invert arch, thereby improving the aforementioned problems.

[0008] The application is as follows:

[0009] The device includes a connecting base, with adjustment mechanisms for adjusting the height of the water pipe on both sides of the top of the connecting base. Each adjustment mechanism comprises two grooves on either side of the top of the connecting base, with a T-shaped frame inside each groove. Both sides of the T-shaped frame have discs for adjusting the water pipe height. By using these adjustment mechanisms, users can move the discs by pushing an operating lever to raise the support frame and the water pipe on it, adjusting the longitudinal slope of the water pipe. This is convenient and eliminates the need to replace Z-shaped steel of different specifications. Furthermore, the rotation of the discs can also drive the vortex disc to rotate, thereby lowering the semi-circular groove and embedding it into the soil, facilitating the installation of the positioning device. The adjustment mechanism not only efficiently adjusts the water pipe height but can also be used for the positioning and installation of the positioning device, making it highly functional.

[0010] As a preferred technical solution of this application, the adjustment mechanism further includes a first spring disposed in the slide groove, two operating rods are disposed inside the T-shaped frame, a second spring is disposed between the two operating rods, and a rotating wheel is disposed on the disc via a bearing.

[0011] As a preferred technical solution of this application, one end of the operating lever is fixedly connected to a gear, and a toothed groove for the gear to be inserted is opened in the middle of one side of the disc.

[0012] As a preferred technical solution of this application, a circular groove communicating with the tooth groove is opened in the middle of the disc. A movable frame is inserted and connected inside the circular groove. A threaded rod is threadedly connected to one end of the movable frame. A square rod is inserted and connected inside the threaded rod. One end of the square rod is fixedly connected to one side of the gear. By setting the square rod, the threaded rod and the tooth groove, when the gear is disengaged from the tooth groove, the square rod can drive the threaded rod to rotate, thereby adjusting the position of the movable frame and separating the positioning pin from the volute. When the gear is inserted into the tooth groove, the disc and the movable frame can rotate together with the gear, thereby facilitating the adjustment of the position of the movable frame and driving the disc to rotate.

[0013] As a preferred technical solution of this application, one end of the movable frame is connected to a connecting frame via a rotating shaft, and a positioning pin is inserted into the end of the connecting frame. A volute is fixedly connected to one side of the disc, and a plurality of slots for cooperating with the volute are provided on one side of the positioning pin. A plurality of semi-circular slots for limiting the positioning pin are provided on both the front and rear sides of the connecting seat. By setting the volute and the slots, the positioning pin can move up and down when the volute rotates, adjusting the position of the positioning pin, thereby facilitating the fixing of the connecting seat. After adjusting the position of the disc, the position of the positioning pin can be adjusted so that the positioning pin is inserted into the corresponding semi-circular slot, thereby fixing the position of the disc. It has strong functionality.

[0014] As a preferred technical solution of this application, the top of the connecting seat is provided with a support mechanism for supporting the water pipe. The support mechanism includes a support frame set on the top of the connecting seat. Two arc-shaped frames are slidably connected inside the support frame. A non-woven fabric pad for water absorption is set in the middle of the arc-shaped frame. Multiple drainage holes for drainage are opened at the bottom of the support frame. By setting the support mechanism, the support frame and the arc-shaped frames can support the water pipe well. Since the seepage hole of the water pipe is located above the circumference of the water pipe, the non-woven fabric pad on the arc-shaped frame can be moved to the position of the water hole of the water pipe by moving the arc-shaped frame, effectively collecting the seepage water without affecting the seepage efficiency of the seepage hole.

[0015] As a preferred technical solution of this application, the front and rear sides of the arc-shaped frame are provided with arc-shaped grooves, and one end of the front and rear sides of the support frame is connected to a magnetic roller located in the arc-shaped groove. By setting the magnetic roller, when the magnetic rollers move away from each other under the action of magnetic force, one end of the magnetic roller can abut against the side wall inside the arc-shaped frame, so as to fix the position of the arc-shaped frame under the action of static friction. When people press the magnetic rollers, one end of the two magnetic rollers can stick together, and then when the arc-shaped frame moves, the magnetic rollers can squeeze the non-woven pad to dehydrate it.

[0016] As a preferred technical solution of this application, a water storage tank is provided in the middle of the top of the connecting seat, and a spring telescopic rod is fixedly installed inside the water storage tank. The top of the spring telescopic rod is threadedly connected to the bottom of the support frame.

[0017] As a preferred technical solution of this application, a rectangular hole is provided in the middle of the bottom end of the connecting seat, and a positioning rod is inserted into the inside of the rectangular hole. Multiple positioning grooves are provided on both sides of the positioning rod. By setting the positioning rod, positioning grooves and positioning ring, people can rotate the positioning ring to insert it into the positioning grooves at different positions, thereby adjusting the distance between the two connecting seats to adapt to pipes of different lengths. Furthermore, by rotating the positioning ring so that the notch on the positioning ring faces the water storage tank, the water in the water storage tank can be discharged through the connecting groove without affecting the drainage efficiency. The positioning ring can be used to adjust the position of the connecting seat on the positioning rod and also to discharge water from the inside of the water storage tank, making it highly functional.

[0018] As a preferred technical solution of this application, the front and rear sides of the top of the rectangular hole are provided with connecting grooves that communicate with the inside of the water storage tank, and a positioning ring that cooperates with the positioning groove is sleeved inside the connecting groove. Attached Figure Description

[0019] Figure 1 A schematic diagram of the positioning device for installing the auxiliary tunnel invert drainage pipe provided in this application;

[0020] Figure 2A schematic diagram of the magnetic roller structure of the positioning device for installing the auxiliary tunnel invert drainage pipe provided in this application;

[0021] Figure 3 A schematic diagram of the arc-shaped frame structure of the positioning device for installing the drainage pipe under the auxiliary tunnel invert provided in this application;

[0022] Figure 4 A schematic diagram of the connecting seat structure of the positioning device for installing the auxiliary tunnel invert drainage pipe provided in this application;

[0023] Figure 5 Positioning device for installing auxiliary tunnel invert drainage pipe provided in this application Figure 1 Enlarged structural diagram at point A in the middle;

[0024] Figure 6 A cross-sectional structural schematic diagram of the connecting seat of the positioning device for installing the auxiliary tunnel invert drainage pipe provided in this application;

[0025] Figure 7 A schematic diagram of the disc structure of the positioning device for installing the auxiliary tunnel invert drainage pipe provided in this application;

[0026] Figure 8 A schematic cross-sectional view of the disc structure of the positioning device for installing the auxiliary tunnel invert drainage pipe provided in this application;

[0027] Figure 9 A schematic diagram of the operating rod structure of the positioning device for installing the auxiliary tunnel invert drainage pipe provided in this application;

[0028] Figure 10 A schematic diagram of the operating rod connection structure of the positioning device for installing the auxiliary tunnel invert drainage pipe provided in this application;

[0029] Figure 11 A schematic diagram of the bottom cross-sectional structure of the support frame for the positioning device for installing the drainage pipe under the auxiliary tunnel invert provided in this application.

[0030] The image shows:

[0031] 1. Connector;

[0032] 2. Support mechanism; 201. Support frame; 202. Drainage hole; 203. Arc-shaped frame; 204. Non-woven fabric pad; 205. Arc-shaped groove; 206. Magnetic roller; 207. Water storage tank; 208. Spring telescopic rod; 209. Connecting groove; 210. Positioning ring; 211. Positioning rod; 212. Positioning groove; 213. Rectangular hole;

[0033] 3. Adjustment mechanism; 301. Slide groove; 302. T-shaped frame; 303. First spring; 304. Operating lever; 305. Second spring; 306. Gear; 307. Disc; 308. Rotary wheel; 309. Tooth groove; 310. Circular groove; 311. Movable frame; 312. Threaded rod; 313. Square rod; 314. Positioning pin; 315. Slot; 316. Vortex disc; 317. Semicircular groove; 318. Connecting frame. Detailed Implementation

[0034] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0035] As described in the background section, adjusting the slope by replacing Z-shaped steel of different specifications is not only inefficient, but also cannot guarantee the longitudinal slope of the pipeline.

[0036] To address this technical problem, the present invention provides a positioning device for assisting in the installation of drainage pipes under the tunnel invert arch, which is used to efficiently adjust the longitudinal slope of the pipe.

[0037] For details, please refer to Figure 1 The positioning device for assisting in the installation of drainage pipes under the tunnel invert specifically includes:

[0038] The device includes a connecting seat 1, with adjusting mechanisms 3 on both sides of the top of the connecting seat 1 for adjusting the height of the water pipe. The adjusting mechanism 3 includes two sliding grooves 301 respectively located on both sides of the top of the connecting seat 1. A T-shaped frame 302 is installed inside the sliding groove 301. A disc 307 for adjusting the height of the water pipe is installed on both sides of the T-shaped frame 302. By setting the adjusting mechanism 3, people can push the operating rod 304 to move the disc 307 to lift the support frame 201 and the water pipe on it, and adjust the longitudinal slope of the water pipe. The operation is convenient and does not require the replacement of Z-shaped steel of different specifications. When the disc 307 rotates, it can also drive the vortex disc 316 to rotate, thereby driving the semi-circular groove 317 to descend and embed itself into the soil, which facilitates the installation of the positioning device. The adjusting mechanism 3 can not only efficiently adjust the height of the water pipe, but also be used for the positioning and installation of the positioning device, making it highly functional.

[0039] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0040] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0041] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0042] Example 1

[0043] Please refer to Figure 1 , Figure 7 , Figure 8 , Figure 9 and Figure 10 A positioning device for assisting in the installation of drainage pipes under the invert of a tunnel. The adjusting mechanism 3 also includes a first spring 303 set in a slide groove 301. Two operating rods 304 are set inside the T-shaped frame 302, and a second spring 305 is set between the two operating rods 304. A rotating wheel 308 is set on the disc 307 through a bearing. By setting the second spring 305, it is convenient for people to rotate the gear 306 and the disc 307, and at the same time, it is convenient for people to push the T-shaped frame 302 and the disc 307 to move. By setting the rotating wheel 308, when people rotate the operating rod 304 to drive the disc 307 to rotate, the rotating wheel 308 will not rotate, so that the weight of the support frame 1 and the water pipe will not affect the rotation of the disc 307 too much.

[0044] Please refer to Figure 1 , Figure 7 , Figure 8 , Figure 9 and Figure 10 A positioning device for assisting in the installation of drainage pipes under the invert of a tunnel. One end of the operating lever 304 is fixedly connected to a gear 306. A toothed groove 309 for the gear 306 to insert is provided in the middle of one side of the disc 307. By setting the toothed groove 309, after the gear 306 is inserted into the toothed groove 309, when the operating lever 304 is rotated, the gear 306 and the disc 307 can rotate together, thereby driving the vortex disc 316 to rotate and driving the positioning pin 314 to move up and down.

[0045] Example 2

[0046] The positioning device for installing the auxiliary tunnel invert drainage pipe provided in Example 1 has been further optimized, specifically, as follows: Figure 1 , Figure 7 , Figure 8 , Figure 9 and Figure 10As shown, a circular groove 310 communicating with a toothed groove 309 is provided in the middle of the disc 307. A movable frame 311 is inserted into the groove 310. A threaded rod 312 is threaded to one end of the movable frame 311. A square rod 313 is inserted into the threaded rod 312. One end of the square rod 313 is fixedly connected to one side of the gear 306. By setting the square rod 313, the threaded rod 312 and the toothed groove 309, when the gear 306 is disengaged from the toothed groove 309, the square rod 313 can drive the threaded rod 312 to rotate, thereby adjusting the position of the movable frame 311 and separating the positioning pin 314 from the volute disc 316. When the gear 306 is inserted into the toothed groove 309, the disc 307 and the movable frame 311 can rotate together with the gear 306, thereby facilitating the adjustment of the position of the movable frame 311 and driving the disc 307 to rotate.

[0047] Furthermore, such as Figure 1 , Figure 7 , Figure 8 , Figure 9 and Figure 10 As shown, one end of the movable frame 311 is connected to the connecting frame 318 via a pivot. The end of the connecting frame 318 is connected to a positioning pin 314. A volute 316 is fixedly connected to one side of the disc 307. Several slots 315 are provided on one side of the positioning pin 314 to cooperate with the volute 316. Several semi-circular grooves 317 for limiting the positioning pin 314 are provided on the front and rear sides of the connecting seat 1. By setting the volute 316 and the slots 315, the positioning pin 314 can move up and down when the volute 316 rotates, adjusting the position of the positioning pin 314, which facilitates the fixing of the connecting seat 1. After adjusting the position of the disc 307, the position of the positioning pin 314 is adjusted so that the positioning pin 314 is inserted into the corresponding semi-circular groove 317, which can fix the position of the disc 307. It has strong functionality.

[0048] Example 3

[0049] The positioning device for installing the auxiliary tunnel invert drainage pipe provided in Embodiment 1 or 2 is further optimized, specifically, as follows: Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 11As shown, the top of the connecting seat 1 is provided with a support mechanism 2 for supporting the water pipe. The support mechanism 2 includes a support frame 201 set on the top of the connecting seat 1. Two arc-shaped frames 203 are slidably connected inside the support frame 201. A non-woven fabric pad 204 for absorbing water is set in the middle of the arc-shaped frame 203. Multiple drainage holes 202 for draining water are opened at the bottom of the support frame 201. By setting the drainage holes 202, the water seeping out of the water pipe can drip into the water storage tank 207 after being absorbed and guided by the non-woven fabric pad, and finally discharged through the connecting groove 209 at the bottom of the connecting seat 1. By setting the support mechanism 2, the support frame 201 and the arc-shaped frame 203 can support the water pipe well. Since the water seepage hole of the water pipe is located above the circumference of the water pipe, by moving the arc-shaped frame 203, the non-woven fabric pad 204 on the arc-shaped frame 203 can be moved to the position of the water hole of the water pipe, effectively collecting the seepage water without affecting the seepage efficiency of the seepage hole.

[0050] Furthermore, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 11 As shown, arc-shaped grooves 205 are provided on both the front and rear sides of the arc-shaped frame 203. Magnetic rollers 206 located in the arc-shaped grooves 205 are inserted and connected to one end of the front and rear sides of the support frame 201. By setting up magnetic rollers 206, when the magnetic rollers 206 move away from each other under the action of magnetic force, one end of the magnetic roller 206 can abut against the inner side wall of the arc-shaped frame 203 to fix the position of the arc-shaped frame 203 under the action of static friction.

[0051] Furthermore, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 11 As shown, a water storage tank 207 is provided in the middle of the top of the connecting seat 1. A spring telescopic rod 208 is fixedly installed inside the water storage tank 207. The top of the spring telescopic rod 208 is threadedly connected to the bottom of the support frame 201. By setting the spring telescopic rod 208, the support frame 201 can move stably up and down on the top of the connecting seat 1 when the disc 307 moves.

[0052] Furthermore, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 11As shown, a rectangular hole 213 is provided in the middle of the bottom of the connecting seat 1. A positioning rod 211 is inserted into the rectangular hole 213. Multiple positioning grooves 212 are provided on both sides of the positioning rod 211. By setting the positioning rod 211, positioning grooves 212 and positioning ring 210, people can rotate the positioning ring 210 to insert it into the positioning grooves 212 at different positions, thereby adjusting the distance between the two connecting seats 1 to accommodate pipes of different lengths. Furthermore, by rotating the positioning ring 210 so that the notch on the positioning ring 210 faces the water storage tank 207, the water in the water storage tank 207 can be discharged through the connecting groove 209 without affecting the drainage efficiency. The positioning ring 210 can be used to adjust the position of the connecting seat 1 on the positioning rod 211 and to discharge the water inside the water storage tank 207, making it highly functional.

[0053] Furthermore, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 11 As shown, the front and rear sides of the top of the rectangular hole 213 are provided with connecting grooves 209 that communicate with the inside of the water storage tank 207. The connecting groove 209 is fitted with a positioning ring 210 that works with the positioning groove 212. By setting the positioning ring 210, when the notch on the positioning ring 210 is facing the positioning rod 211, the connecting seat 1 can be moved on the positioning rod 211. When the notch is facing upward, the water in the water storage tank 207 can be discharged through the connecting groove 209.

[0054] Example 4

[0055] The usage process of the positioning device for auxiliary tunnel invert drainage pipe installation provided by the present invention is as follows:

[0056] First, rotate the positioning ring 210 so that the notch faces the positioning rod 211. Adjust the distance between the two connecting seats 1 according to the length of the water pipe. After adjustment, rotate the positioning ring 210 so that the notch of the positioning ring 210 faces upward, so that the water in the water storage tank 207 can be discharged.

[0057] Press the magnetic roller 206 inward to make one end of the magnetic roller 206 fit together. Move the arc frame 203 so that the non-woven fabric pad 204 on the arc frame 203 can be moved to the position of the water seepage hole of the water pipe. Release the magnetic roller 206. Under the action of magnetic force, the two magnetic rollers 206 move in opposite directions. One end of the magnetic roller 206 fits together with one end inside the arc frame 203, fixing the arc frame 203.

[0058] When the height of the support frame 201 needs to be adjusted, rotate the operating lever 304 to rotate the square rod 313 and the threaded rod 312. The threaded rod 312 drives the movable frame 311 to move, causing the positioning pin 314 to separate from the volute disk 316. At this time, push the operating lever 304 to both sides to insert the gear 306 into the tooth groove 309. Pushing the operating lever 304 causes the disc 307 to move on the connecting seat 1, pushing the slide 301 to move longitudinally to adjust the height. After the adjustment is completed, move the operating lever 304 inward. Under the action of the second spring 305, the gear 306 and the disc 307 move together. Separate the tooth groove 309, rotate the operating lever 304 to adjust the position of the movable frame 311 so that the positioning pin 314 contacts the volute 316 and the positioning pin 314 enters the corresponding slot 315, restricting the movement of the disc 307. Insert the gear 306 into the tooth groove 309 again, rotate the operating lever 304, and the disc 307 and volute 316 rotate. The positioning pin 314 moves in the connecting frame 318 under the action of the semi-circular groove 317 and the volute 316. The bottom end of the positioning pin 314 is inserted into the soil, completing the positioning and installation of the connecting seat 1.

[0059] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0060] Obviously, the embodiments described above are merely some embodiments of the present invention, not all embodiments. The accompanying drawings show preferred embodiments of the present invention, but do not limit the patent scope of the present invention. The present invention can be implemented in many different forms; rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this invention.

Claims

1. A positioning device to assist installation of a tunnel invert underdrain, characterised in that, The utility model provides a water pipe height adjusting device, including the connecting seat (1), both sides of the top end of connecting seat (1) are provided with the adjusting mechanism (3) for adjusting water pipe height, the adjusting mechanism (3) includes two slide grooves (301) that are arranged respectively at both sides of the top end of connecting seat (1), the inside of slide groove (301) is provided with T-shaped frame (302), both sides of T-shaped frame (302) are provided with the disc (307) for adjusting water pipe height, The adjusting mechanism (3) further includes a first spring (303) disposed within the slide groove (301), the inside of the T-shaped frame (302) is provided with two operating rods (304), a second spring (305) is disposed between the two operating rods (304), a rotating wheel (308) is disposed on the disc (307) through a bearing, One end of the operating rod (304) is fixedly connected with a gear (306), a gear slot (309) is formed in the middle of one side of the disc (307) for inserting the gear (306), A circular groove (310) is formed in the middle of the disc (307) and communicates with the gear slot (309), an activity frame (311) is inserted into the inside of the circular groove (310), one end of the activity frame (311) is threadedly connected with a threaded rod (312), a square rod (313) is inserted into the inside of the threaded rod (312), and one end of the square rod (313) is fixedly connected with one side of the gear (306).

2. A positioning device to assist installation of a tunnel invert below drain according to claim 1, characterised in that, One end of the activity frame (311) is connected with a connecting frame (318) through a rotating shaft, the end of the connecting frame (318) is inserted with a positioning pin (314), one side of the disc (307) is fixedly connected with a vortex disc (316), a plurality of clamping grooves (315) are formed in one side of the positioning pin (314) and are matched with the vortex disc (316), a plurality of semicircular grooves (317) are formed in the front and back sides of the connecting seat (1) and are used for limiting the positioning pin (314).

3. A positioning device to assist installation of a tunnel invert below drain according to claim 2, characterised in that, The top of the connecting seat (1) is provided with a supporting mechanism (2) for supporting the water pipe, the supporting mechanism (2) includes a supporting frame (201) arranged on the top of the connecting seat (1), two arc-shaped frames (203) are slidingly connected in the inside of the supporting frame (201), a non-woven fabric pad (204) for water absorption is arranged in the middle of the arc-shaped frame (203), and a plurality of drainage holes (202) are formed in the bottom of the supporting frame (201) and are used for draining water.

4. A positioning device to assist installation of a tunnel invert below drain according to claim 3, wherein, Arc-shaped grooves (205) are formed in the front and back sides of the arc-shaped frame (203), and magnetic circular rollers (206) are inserted into the arc-shaped grooves (205) and are connected with one end of the front and back sides of the supporting frame (201).

5. A positioning device to assist installation of a tunnel invert below drain according to claim 4, wherein, A water storage groove (207) is formed in the middle of the top end of the connecting seat (1), a spring telescopic rod (208) is fixedly installed in the inside of the water storage groove (207), and the top end of the spring telescopic rod (208) is threadedly connected with the bottom end of the supporting frame (201).

6. A positioning device to assist installation of a tunnel invert below drain according to claim 5, wherein, The middle part of the bottom end of the connecting seat (1) is provided with a rectangular hole (213), and the inside of the rectangular hole (213) is connected with a positioning rod (211).

7. A positioning device to assist installation of a tunnel invert below drain according to claim 6, characterised in that, The front and back sides of the inside top end of the rectangular hole (213) are provided with a connecting groove (209) in communication with the inside of the water storage groove (207), and the inside of the connecting groove (209) is provided with a positioning ring (210) matched with the positioning groove (212).

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