Steel pipe transportation and installation method and transportation tool for small-diameter diversion tunnel repair

Abstract

The application provides a steel pipe transportation installation method and tool for small-diameter water diversion tunnel repair. The transportation method specifically comprises the following steps: firstly, laying a transportation steel rail in an inverted arch area of a water diversion tunnel, then transporting steel pipe segments, respectively adding steel pipe transportation tools at both ends of the steel pipe segments, using a battery car to drive the steel pipe transportation tools to drive the steel pipe to stably move along the steel rail into a to-be-repaired area in the water diversion tunnel, and adjusting the height of the steel pipe segment by a jack during the transportation process; after the steel pipe segment is transported to the repair position, the steel pipe transportation tool is removed, longitudinal and staggered bench adjustment is performed by a forward and reverse wire rod, the staggered bench flatness of two steel pipe segments is adjusted by inserting a wedge into a 7-shaped connecting plate, and after the two steel pipe segments are welded and fixed, external grouting filling of the steel pipe is performed. The application uses a new transportation tool, solves long-distance transportation of steel pipes in narrow tunnels, and can well solve the problems of inconvenient steel pipe positioning, adjustment and installation due to limited space in the tunnel.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of water diversion tunnel repair, and particularly relates to a steel pipe transportation and installation method for small-diameter water diversion tunnel repair and a transportation tool. BACKGROUND

[0002] Small-section tunnels are often used in water conveyance projects. Smooth blasting is generally used for tunnel excavation, and different types of support such as reinforced concrete, net-spraying anchor and sprayed concrete support, and unlined support are used according to different geological conditions along the line. With the passage of time, some paths of the water diversion tunnel need to be repaired due to various reasons. The existing tunnel repair methods mainly include cast-in-place lining method and steel pipe lining method. In the cast-in-place lining method, construction materials and equipment are transported from the entrance of the tunnel to the construction site, and then the construction is carried out in the tunnel. This method requires a large space for construction, and some large equipment is also troublesome to transport. Due to the characteristics of small tunnel diameter, various cross-section forms and long water conveyance line of water conservancy projects, the construction site is limited due to the small tunnel diameter in the repair process using the cast-in-place lining method, and large equipment cannot enter. The various cross-section forms increase the transportation risk, and the long distance from the entrance of the tunnel to the construction site greatly reduces the construction efficiency. The repair progress of the water diversion tunnel is directly related to the water supply for the residents and factories. During the repair period, it is in the dry season, and the repair needs to be completed as soon as possible to restore the water supply function of the water diversion tunnel. Therefore, the construction period is required to be relatively strict.

[0003] Compared with the cast-in-place lining method, the steel pipe lining method is safer and can complete the construction task on schedule. However, in the construction process of the steel pipe lining method, the steel pipe lining method needs to be transported through a long section of road. The long-distance transportation of small-diameter tunnel steel pipes is also difficult, and the positioning and welding of the steel pipe in the tunnel are also difficult. During the repair process, the rock layer along the joint crack weathering, such as the existence of other tunnels under the water diversion tunnel, if the steel pipe positioning and welding are not accurate, and the filling behind the steel pipe wall is not dense, it may have a serious impact on the operation of the subway tunnel in the water supply project. Therefore, in order to enable the steel pipe lining method to be applied to the repair of small-diameter water diversion tunnels, the long-distance transportation and welding positioning of the steel pipe in the narrow tunnel need to be solved. SUMMARY

[0004] The present application provides a steel pipe transportation installation method and transportation tool for small-diameter water diversion tunnel repair, which uses a new transportation tool to quickly adjust the transportation height of the steel pipe at any time during transportation, smoothly passes through the small section by reducing the height, and conveniently transports and solves the problems of inconvenient steel pipe positioning, adjustment and installation in the limited tunnel site.

[0005] To solve the above technical problems, the present application provides a steel pipe transportation installation method for small-diameter water diversion tunnel repair, which specifically comprises the following steps:

[0006] S1: Laying transportation steel rails in the inverted arch area of the water diversion tunnel: first, determine the minimum hole diameter and boundary size of the water diversion tunnel before construction, and remove the concrete of the track laying range and backfill the concrete of the bare hole section, then lay the sleepers to level the track bottom surface, and finally install the transportation steel rails on the sleepers;

[0007] S2: Transportation of steel pipes for tunnel repair:

[0008] ① Steel pipe transportation is carried out in sections, and the length of each steel pipe section is 3-5 m; first, the first steel pipe section is hoisted to the laid steel rails at the hole, steel pipe transportation tools are installed at both ends of the steel pipe section, the walking wheels of the steel pipe transportation tools are matched with the transportation steel rails, a jack is installed on the steel pipe transportation tool, the height of the steel pipe is adjusted to the height suitable for the tunnel through the jack, and the steel pipe is fixed;

[0009] ② After the connection of the steel pipe transportation tool and the steel pipe section is completed, the steel pipe transportation tool is pushed by a battery car to drive the steel pipe to smoothly advance along the steel rails to the repair area in the water diversion tunnel; during transportation, when passing through a narrow section, the height of the steel pipe is adjusted through the jack to enable the steel pipe to smoothly pass through the narrow section area of the water diversion tunnel;

[0010] ③ After the steel pipe section is transported to the repair position, the steel pipe is adjusted to contact and fall into position with the steel rails through the jack, the jack is removed, the transportation tools at both ends of the steel pipe are separated from the steel pipe, the rear transportation tool is removed by the battery car, then a lifting ring is welded on the inside top of the steel pipe, the transportation tool at the front end of the steel pipe is moved to the inside of the steel pipe through the hoisting mechanism, and then moved to the rear end of the steel pipe along the inner wall of the steel pipe, and finally removed by the battery car;

[0011] ④ After the steel pipe section is transported to the repair position and the transportation tools at both ends are removed, the installation position of the steel pipe section is finely adjusted with or without a winch to accurately move to the repair position;

[0012] S3: repeat step S2 to transport the second section of steel pipe to the joint site with the first section of steel pipe, install the positive and negative wire pull rod in the two sections of steel pipe, adjust the longitudinal and staggered table through the positive and negative wire pull rod, when the two steel pipes are jointed, weld the 7-shaped connecting plate at the bottom of the staggered joint, and insert the wedge into the gap of the 7-shaped connecting plate to adjust the staggered flatness of the two sections of steel pipe, and then weld the two sections of steel pipe after the adjustment is completed;

[0013] S4: after the fixing of the steel pipe section is completed, the steel pipe is filled externally, a grouting flower pipe is embedded in the inner wall of the tunnel at the top of the steel pipe section before filling, and a head mold is used to block the two ends of the steel pipe section, and then the area between the outer wall of the steel pipe section and the inner wall of the tunnel is backfilled through the embedded grouting flower pipe; the grouting backfilling is carried out from the front of the steel pipe section away from the entrance, and the grouting backfilling is continued while the next section of steel pipe is transported according to the step S2;

[0014] S5: after the grouting backfilling in the step S4 is completed, the newly transported steel pipe section is spliced with the backfilled steel pipe section, and the step S4 is repeated to continue backfilling the newly transported steel pipe section, while the next section of steel pipe is transported;

[0015] S6: repeat the step S5 until the entire water diversion tunnel repair is completed.

[0016] The preferred technical scheme of the present application: in the step S1, the base surface is treated by manual breaking and mortar leveling before track installation, to ensure that the track installation base surface is flat, then the position of the sleeper is determined by measuring and placing points, and the depth of chiseling both sides of the line and chiseling is determined by using a line, to ensure that the channel steel sleeper is smoothly laid, after chiseling is completed, the base surface is cleaned and leveled by mortar, then the track bottom surface is leveled by laying steel plates or channel steel and I-beam, and finally the steel rail is installed.

[0017] The preferred technical scheme of the present application: the steel pipe transportation tool in the step S2 includes a support platform, a jack working platform, a steering fixed platform and a connecting plate, the bottom of the support platform is provided with a steel wheel matched with the tunnel inner transportation rail, the jack working platform is fixed on one end of the support platform adjacent to the steel pipe to be transported through a first support, the steering fixed platform is installed above the jack working platform through a second support, the connecting plate is fixed on the steering fixed platform through a lifting pivot, and the connecting plate extends into the steel pipe to be transported and is connected with the support plate welded with the inner wall of the steel pipe through a screw; a jack is installed on the jack working platform, the lifting end of the jack is in contact with the connecting plate, the connecting plate is lifted upward by the jack, at this time the connecting plate drives the steel pipe to be transported to lift upward, after reaching the predetermined position, the gap between the steering fixed platform and the connecting plate is tightly filled with a cushion block, and the jack is lowered, so that the assembly of the steel pipe and the transportation tool is completed; during transportation, when a narrow section is encountered, the connecting plate is adjusted to be higher through the jack, and the height of the steel pipe is adjusted to be able to smoothly pass through the tunnel area by taking out or adding the cushion block.

[0018] The preferred technical scheme of the present application: in the step S2, the hoist is used to assist in adjusting the transportation position of the steel pipe during transportation, and the specific process is as follows: first, the electric vehicle is used to push the steel pipe transportation tool to drive the steel pipe to move to a position 1-2 m away from the repaired area in the diversion tunnel, then the hoist is fixed on the tunnel floor in front of the steel pipe, the electric vehicle is stopped, the hoist is used to pull the front end of the steel pipe to drive the steel pipe to continue to move along the track to a position 30-50 cm away from the repaired area in the diversion tunnel, and then the pulling is stopped; the connecting bolt between the connecting plate of the front end and rear end transportation tool of the steel pipe and the inner wall support plate of the steel pipe is loosened, the jack is adjusted to be higher, the pad block of the plug pad is taken out, the jack is adjusted back, the lifting height of the jack is fully retracted, after the steel pipe is in contact with the steel rail and falls into position, the jack and the bolt are taken out, the front end transportation tool of the steel pipe is removed, then a lifting ring is welded on the steel pipe, and the front end transportation tool of the steel pipe is moved into the steel pipe in the falling position by using the chain hoist and the crowbar; after the hoist connected with the steel pipe continues to pull to the repaired area in the diversion tunnel, the rear end transportation tool of the steel pipe is removed, the electric vehicle is used to move away the rear end transportation tool of the steel pipe, and then the front end transportation tool of the steel pipe in the steel pipe is moved away.

[0019] The preferred technical scheme of the present application: in the step S3, the adjustment principle is from large to small, from top to bottom, and symmetrically; the positive and negative wire pull rod comprises two positive and negative wire screws welded on the inner walls of the two steel pipe sections and an adjusting sleeve connecting the two screws, a pry hole is arranged on the adjusting sleeve, and the pry hole is used to rotate the adjusting sleeve to pull the two steel pipe sections close to each other; the 7-shaped connecting plate is welded on the inner walls of the two steel pipe sections at two ends respectively, the wedge block is inserted into the gap, and the height of the two steel pipe sections is adjusted by knocking the wedge block.

[0020] The preferred technical scheme of the present application: in the step S4, high-strength non-shrinkage grouting material is used to fill the outside of the steel pipe section, the overall length of the steel pipe section filled for the first time is 10-12 m, and the grouting material and the grouting equipment are pulled to the repaired section before the steel pipe section is transported; the two steel pipe sections are transported and welded at the same time during each grouting backfilling, and the two steel pipe sections welded into one are spliced with the steel pipe section after the grouting backfilling is completed to perform the next grouting backfilling.

[0021] The preferred technical scheme of the present application: in the step S4, a 4-6 cm thick wooden plate is used as a sealing head mold for sealing, two circles of main ribs are arranged, the inner circle is connected with the steel pipe, the distance between the inner circle and the outer circle is 40-60 cm, and the outer circle is inclined to the steel pipe by using steel bars; the grouting flower pipe is made of steel pipe and has the same length as the length of the grouting steel pipe section, the grouting flower pipe is fixed on the tunnel rock wall by expansion bolts, the grouting flower pipe is arranged along the extension direction of the tunnel, and a row of grout outlets is arranged on the side of the grouting flower pipe adjacent to the steel pipe section.

[0022] In order to solve the above technical problems, the application also provides a steel pipe transportation tool for small-diameter water diversion tunnel repair, which comprises a support platform, a jack working platform, a steering fixed platform and a connecting plate, the bottom of the support platform is provided with steel wheels matched with the steel rails in the tunnel, the jack working platform is fixed on one end of the support platform adjacent to the steel pipe to be transported through a first support, the steering fixed platform is installed above the jack working platform through a second support, the connecting plate is fixed on the steering fixed platform through a lifting rotating shaft, and the connecting plate extends into the steel pipe to be transported and is connected with the steel pipe to be transported through a connecting member.

[0023] In the preferred technical solution of the application, the support platform is a square platform, the four corners of the bottom are respectively provided with steel wheels, and a connecting lug plate is arranged on the side of the first support away from the steel pipe to be transported; the width of the jack working platform is greater than the width of the steering fixed platform, jack supports are symmetrically arranged at the positions adjacent to the two ends of the jack working platform, and the lifting end of the jack is in contact with the connecting plate after the jack is installed on the jack support.

[0024] In the preferred technical solution of the application, the connecting member comprises a support plate welded on the inner wall of the steel pipe to be transported, the connecting plate is provided with corresponding bolt connection holes on the support plate, and the connecting plate is fixedly connected with the support plate through connecting bolts; the middle part of the steering fixed platform is provided with a circular support table, a rotating shaft insertion hole is arranged at the center position of the circular support table, the lifting rotating shaft is a metal shaft provided with an enlarged head at one end, and the length of the lifting rotating shaft is greater than the lifting height of the jack installed on the jack working platform; the connecting plate is provided with a rotating shaft insertion hole matched with the rotating shaft insertion hole of the circular support table, and when the connecting plate is placed on the steering fixed platform, the lifting rotating shaft is movably inserted into the rotating shaft insertion holes of the connecting plate and the circular support table; and after the jack is installed on the jack working platform, the jack drives the connecting plate to move up and down along the lifting rotating shaft, and a support pad is arranged between the connecting plate and the steering fixed platform during the lifting process.

[0025] The application has the following beneficial effects:

[0026] (1) The transportation tool in the application can be quickly assembled, disassembled and reused compared with the traditional transportation facilities, has high adaptability, can quickly adjust the transportation height of the steel pipe at any time during the transportation, can smoothly pass through the small section by reducing the height, can be conveniently transported and speed up the transportation speed after increasing the height in the large section, and has strong bearing capacity and can integrally transport the steel pipe with large diameter and large weight.

[0027] (2) The large-diameter steel pipe transportation tool in the application can integrally transport the steel pipe with large weight and large diameter, avoids the work of transporting the steel pipe into the tunnel after being divided into blocks and welding, reduces the welding work, and reduces the risk of welding quality defects.

[0028] (3) The application provides a diversion tunnel transportation track positioning control technology, according to different section forms, track leveling is carried out in the tunnel inverted arch range, and the leveling waterproof is selected according to local conditions, so that the transportation track of the steel pipe is smoothly completed, reliable guarantee is provided for the transportation of the steel pipe and material, the transportation steel rail is installed, and the transportation process risk is reduced.

[0029] (4) In the application, after the large-diameter steel pipe is transported to the repair position by the transportation tool, longitudinal and staggered table adjustment is carried out by using the forward and reverse wire pull rod, and staggered table flatness adjustment is carried out by using the 7-shaped plate and the wedge-shaped block, so that the precise positioning of the steel pipe is realized, a good foundation is provided for subsequent welding work, the overall quality and stability of welding are ensured, the difficulty of steel pipe positioning and adjustment caused by the limited space in the hole is solved, the labor and equipment investment are reduced, and the construction progress is accelerated.

[0030] (5) The application utilizes the steel pipe external filling technology in a narrow space, the steel pipe external filling adopts high-strength non-shrinkage grouting material backfilling, after the steel pipe is transported to the repair position by the transportation tool, the segmented steel pipe is welded into a whole body every 2-4 segments, a steel flower pipe is installed on the top of the tunnel, a row of grouting outlets is arranged at the bottom of the steel pipe, the steel flower pipe is fixed on the tunnel rock wall through the expansion bolt, and the grouting pipe is embedded for grouting material backfilling. By using the method, the steel pipe external filling is quickly completed, and the problems of large amount of concrete transportation, vibration, and pouring in the narrow diversion tunnel are solved. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a structural schematic view of the transportation tool in the application;

[0032] Figure 2 is a side view of the transportation tool in the application;

[0033] Figure 3 is a front view of the transportation tool in the application;

[0034] Figure 4 is an adjustment schematic view of the forward and reverse wire pull rod in the application;

[0035] Figure 5 is a staggered table leveling schematic view in the application;

[0036] Figure 6 is a head template schematic view in the application.

[0037] In the diagram: 1—Support platform, 2—Jack working platform, 200—Jack support, 3—Connecting plate, 4—Steel wheel, 5—First support, 6—Steel pipe to be transported, 7—Steering and fixing platform, 700—Circular support platform, 8—Second support, 9—Connecting component, 10—Connecting lug, 11—Lifting shaft; 12—Positive and negative threaded rod, 1200—Pry hole, 13—7-shaped connecting plate, 14—Wedge, 15—Grouting steel pipe, 16—First steel pipe section, 17—Second steel pipe section, 18—Main beam, 19—Tunnel. Specific Implementation

[0038] The present invention will be further described below with reference to the accompanying drawings and embodiments. Figures 1 to 6 All accompanying drawings are simplified versions of embodiments and are intended only to clearly and concisely illustrate the embodiments of the present invention. The technical solutions shown in the drawings below are specific solutions of embodiments of the present invention and are not intended to limit the scope of the claimed invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0039] The embodiment provides a long-distance, large-diameter steel pipe transportation device in the confined space of a water diversion tunnel, such as... Figure 1 and Figure 2 As shown, the transport device includes a support platform 1, a jack working platform 2, a steering and fixing platform 7, and a connecting plate 3. The support platform 1 is a square platform with steel wheels 4, matching the transport rails inside the tunnel, installed at the four corners of its bottom. The steel wheels have a diameter of 30cm and a wheel spacing of 970mm. A connecting lug 10 is provided on the side of the first support 5 away from the steel pipe 6 to be transported. The jack working platform 2 is fixed to the support platform 1 near the end of the steel pipe 6 to be transported via the first support 5. The steering and fixing platform 7 is installed above the jack working platform 2 via a second support 8. The width of the jack working platform 2 is greater than the width of the steering and fixing platform 7. Jack supports 200 are symmetrically installed near both ends of the jack working platform 2. After the jacks are installed on the jack supports 200, the lifting end of the jacks contacts the connecting plate 3. The second support 8 is located between the two jack supports 200.

[0040] The embodiment provides a long-distance, large-diameter steel pipe transportation device in the confined space of a water diversion tunnel, such as... Figure 1 and Figure 2As shown, the connecting plate 3 is fixed on the turning fixed platform 7 through the lifting rotating shaft 11, and extends into the steel pipe 6 to be transported and is connected with the steel pipe 6 to be transported through the connecting member 9. The connecting member 9 comprises a support plate welded on the inner wall of the steel pipe 6 to be transported, and the connecting plate 3 is provided with corresponding bolt connecting holes on the support plate and is fixedly connected with the support plate through connecting bolts. The middle part of the turning fixed platform 7 is provided with a circular support table 700, and a rotating shaft insertion hole is formed at the center position of the circular support table 700. The lifting rotating shaft 11 is a metal shaft provided with an enlarged head at one end, and the length of the lifting rotating shaft 11 is greater than the lifting height of the jack installed on the jack working platform 2. The connecting plate 3 is provided with a rotating shaft insertion hole matched with the rotating shaft insertion hole, and when the connecting plate 3 is placed on the turning fixed platform 7, the lifting rotating shaft 11 is movably inserted into the rotating shaft insertion holes of the connecting plate 3 and the circular support table 700. After the jack is installed on the jack working platform 2, the jack drives the connecting plate 3 to move up and down along the lifting rotating shaft 11, and during the lifting process, a supporting pad is arranged between the connecting plate 3 and the turning fixed platform 7.

[0041] The application is further described below in combination with an embodiment, and the embodiment is directed to the Minjiang Water Diversion Project in Fuqing City. The project is a large-scale water supply project that uses the water source of Wulongjiang in the south port of Minjiang River, sets up a pumping station to pump water, and transports water to Hongkuan Industrial Village, Yuanhong Industrial Development Zone, and Longgao and Jiangyin areas through water structures such as tunnels and pipelines. The tunnel has been in operation for a long time, and the selected repair section is the water diversion tunnel from Xiannan to Xindu, with a cross-sectional diameter of 4 m and a local cross-sectional diameter of only 3 m. According to the actual measurement, the net height is between 3.0 m and 3.2 m for 147 m, between 3.2 m and 3.4 m for 980 m, and above 3.4 m for 2870 m. The tunnel space is small, and the total length from the repair inlet and outlet to the repair position is 4 km. The repair adopts the scheme of installing a steel pipe in the tunnel and backfilling with high-strength non-shrinkage grouting material outside the pipe for repair and reinforcement. DN2800 steel plate lining is used, with a steel plate thickness of 20 mm. Backfilling is performed between the steel plate and the original tunnel lining. In order to speed up the repair progress, shorten the repair time, and reduce the impact of the Minjiang Water Diversion Project on water supply, combined with the construction conditions and convenient construction on site, high-strength non-shrinkage grouting material with a strength not less than C50 is used for backfilling. The steel pipe lining repair length is 76 m, and the transportation distance from the construction inlet and outlet to the repair section is 4 km. Due to the long transportation distance, the small diameter of the tunnel, and the large diameter of the steel pipe, the existing method cannot achieve transportation. Therefore, the transportation device in the application is used to transport the steel pipe.

[0042] The mode of the DN2800 steel pipe for repair is segmented (4m / segment, a total of 19 segments), the inner diameter of the steel pipe is 2.8m, the outer diameter is 2.84m, and the minimum cross section in the hole is 3.0m. The large-diameter steel pipe lining is processed in the factory and then transported to the site. The steel pipe is hoisted to the steel rail laid at the entrance of the hole by a 100t truck crane. The steel pipe is directly placed on the rail, with the lowest point of the lower arc surface being 7.8cm below the top surface of the rail and 6.2cm from the bottom surface of the rail. Then the transport tooling is installed at both ends of the steel pipe. The transport tooling and the steel pipe inner wall support plate are connected by bolts, which facilitates the disassembly and assembly of the tooling and realizes the turnover use. The specific construction process is as follows:

[0043] S1: Laying transport steel rails in the inverted arch area of the diversion tunnel: Before the implementation of the project, the original tunnel structure is various, which is divided into a diameter of 3.3m lining section, a diameter of 3m lining section, a bare hole section, and a stone collecting pit section. The lining section structure surface elevation in the same axis is higher than that of the bare hole section and the stone collecting pit section. It is planned to adopt the method of removing the concrete of the lining section track laying range and backfilling the concrete of the bare hole section (stone collecting pit section). Channel steel, steel strip, and I-beam are used as sleepers to level the track bottom surface to ensure that the track surface elevation is flat and meets the requirements of steel pipe transportation in the hole. Specifically, first, the track sleeper laying range is laid out according to the tunnel center line using a total station. The track surface elevation is determined by considering the tunnel bottom elevation. For the measured base surface that is higher, artificial and mechanical methods are used to remove it. For the measured base surface that is lower, C25 fine stone concrete is used for backfilling and leveling. Then the track installation is carried out.

[0044] Track installation of the diameter 3.3m lining section: 43kg / m steel rails are used, with a track gauge of 0.9m and a length of 1.2m of 14# channel steel as the diameter 3.3m two lining concrete section sleepers. The concrete removal height at the bottom of the track is 57mm, and the width is 173mm, ensuring that the total width reaches 1.2m. Then the points are measured and laid out, with one point every 20m, the positions of the sleepers are marked out at an interval of 1m, and the lines for removal and the depth of removal are determined by pulling the line. The width of each sleeper position is 15cm, ensuring the smooth laying of the channel steel sleeper. After the removal is completed, the base surface is cleaned and leveled with mortar, and finally the channel steel and steel rails are laid.

[0045] The bare hole section and the catch pit section have no secondary lining concrete. The track installation process is as follows: laying 1.5m long battery car sleepers as large-diameter secondary lining concrete sleepers; before laying, the uneven positions of the bottom plate are backfilled and leveled with 25 fine stone concrete, and for positions with a height difference of less than 2cm, a 1cm, 5mm and 3mm thick steel plate is placed under the I-steel sleeper to level it. Before construction, the points are measured and placed, one point every 20m, and a line is drawn, the position of the sleeper is marked at an interval of 1.5m, the width of the side chiseled is about 10cm, and the height is about 11cm.

[0046] The 3.0m diameter lining section uses steel strips as the track; before construction, first, the points are positioned, the width of the bottom chiseled is 1262mm, the height is 147mm, and the length of the chiseled is all areas with a lining diameter below 3.3m. After chiseling the concrete structure, a 3cm thick and 18cm wide steel strip is laid, and the outside of the steel strip is fixed with Φ20mm@1000mm reinforcement; before laying the steel strip, holes with a diameter of Φ22 are drilled at a distance of 3cm from the outside of the steel strip, with a spacing of 1000mm. After laying is completed, Φ20mm reinforcement is planted through the holes, with a planting depth of 10cm and an external allowance of 2cm.

[0047] S2: Transportation of steel pipes for repair in the tunnel; the steel pipes are transported in sections, with a length of 4m per section; the total weight of the steel pipe section, the inner support and the transportation tooling of the project is 6t, according to the site investigation, the distance from the excavation top to the center of the pipe is 14m, the vertical distance between the leg spacing of the 100t crane and the center of rotation is 3m, and the hoisting radius is 17m; the rated lifting capacity of the 100t truck crane with a rotating radius of 18m and an arm length of 30.4m is 11.2t, which meets the hoisting requirements. The 100t truck crane is used to sequentially hoist and place the steel pipe front-end transportation tooling, the steel pipe section, the steel pipe rear-end transportation tooling and the battery car (using a power-driven flat car), and the walking wheels of the steel pipe transportation tooling are matched with the transportation rails; the specific transportation process is as follows:

[0048] ①First, the first steel pipe section is hoisted and transported to the steel rails laid at the tunnel entrance, at this time the steel pipe is directly placed on the track, with the lowest point of the lower curved surface being 7.8cm below the top surface of the track and 6.2cm from the bottom surface of the track; steel pipe transportation tooling is installed at both ends of the first steel pipe section, the connecting plate of the steel pipe transportation tooling is connected with the inner wall support plate of the steel pipe section by bolts; and a jack is installed on the jack working platform, the jacking end of the jack is in contact with the connecting plate, the connecting plate is lifted upward by the jack, at this time the connecting plate drives the steel pipe section to lift upward, after reaching the predetermined position, the gap between the steering fixed platform and the connecting plate is tightly filled with shims, and the jack is adjusted to be lower, which completes the assembly of the steel pipe and the transportation tooling;

[0049] ② After the steel pipe transport tool is connected to the steel pipe section, the electric vehicle is used to push the steel pipe transport tool to move the steel pipe smoothly along the rail to a position 1-2m away from the area to be repaired in the water diversion tunnel. During the transport process, when encountering narrow sections, the connecting plate is raised by jacks, and the steel pipe is adjusted to a height that can pass smoothly through the tunnel area by removing or adding pads.

[0050] ③ Then, fix the winch on the tunnel floor in front of the steel pipe, stop the battery truck, and use the winch to pull the front transport fixture of the steel pipe to continue moving the steel pipe along the track to a distance of 30-50cm from the area to be repaired inside the water diversion tunnel, and stop dragging; loosen the connecting bolts between the connecting plates of the front and rear transport fixtures of the steel pipe and the support plate of the inner wall of the steel pipe, then raise the jack, remove the shim, and lower the jack back to fully retract the jack's lift. After the steel pipe contacts and settles in place with the rail, remove the jack and bolts, remove the front transport fixture of the steel pipe, and then weld the lifting ring on the steel pipe. Use a hand-operated hoist and a crowbar to move the front transport fixture of the steel pipe into the settled steel pipe; after the winch is connected to the steel pipe and continues to drag it to the area to be repaired inside the water diversion tunnel, remove the rear transport fixture of the steel pipe, use the battery truck to move the rear transport fixture of the steel pipe away first, and then move the front transport fixture of the steel pipe inside the steel pipe away.

[0051] ④ After the steel pipe section is transported to the repair location and the transport fixtures at both ends are removed, if it is in place accurately, no fine-tuning is required. If there is still an error, the installation position of the steel pipe section can be fine-tuned by using a winch to move it accurately to the repair location.

[0052] S3: Repeat step S2 to transport the second steel pipe section 17 to the joint with the first steel pipe section 16, such as... Figure 4 As shown, positive and negative threaded tie rods 12 are installed inside the two steel pipe sections. Longitudinal and misalignment adjustments are made using the positive and negative threaded tie rods 12. After the two steel pipes are joined; as... Figure 5 As shown, a 7-shaped connecting plate 13 is welded at the bottom staggered joint, and a wedge 14 is inserted into the gap of the 7-shaped connecting plate 13 to adjust the flatness of the misalignment of the two steel pipe sections. After adjustment, the two steel pipe sections are welded together. The adjustment principle is: from large to small, from top to bottom, and symmetrical. Figure 4 As shown, the positive and negative threaded pull rod 12 includes two positive and negative threaded rods welded to the inner walls of the two steel pipe sections and an adjusting sleeve connecting the two threaded rods. A pry hole 1200 is provided on the adjusting sleeve, and the two steel pipe sections are pulled closer by rotating the adjusting sleeve with a pry bar; Figure 5 As shown, the two ends of the 7-shaped connecting plate 13 are welded to the inner walls of the two steel pipe sections respectively. The wedge block 14 is inserted into the gap, and the elevation of the two steel pipe sections is adjusted by tapping the wedge block.

[0053] S4: After the steel pipe section is fixed, the steel pipe is filled outside; before the steel pipe is transported, the grouting material and equipment are pulled to the repair section, and the experience of mixing, pouring and setting time of the grouting material is summarized; the expansion bolts are implanted and the rail and the steel rail intersection is welded firmly to ensure that the rail guide table does not deform when the steel pipe and the trolley are dragged. A 5cm thick wood board is used as a sealing head mold to seal, as shown in Figure 6 The main rib 18 uses two Φ25 steel bars side by side, a total of two circles inside and outside, the inner circle is connected with the steel pipe by the Φ25 steel bar head, and the interval is 50cm. The outer circle is inclined to the steel pipe by Φ25 steel bar, and the interval is 50cm. The grouting material backfill adopts a steel flower pipe form, three Φ80mm grouting steel flower pipes 15 are installed at the top, the length is 12m, a row of Φ50mm grouting outlets is set at the bottom of the steel pipe, the interval is 1m, before the steel pipe with a diameter of 2.8m is in place, the steel flower pipe is fixed on the tunnel 19 rock wall through the expansion bolt, and the grouting pipe is embedded to backfill the grouting material. The specific grouting process is as follows:

[0054] The first pouring selects three steel pipe sections with a total length of 12m as a grouting material backfill section and a test section. After the three steel pipe sections are transported and fixed, the two ends are sealed after welding, and the grouting backfill is carried out on the opposite side; at the same time of welding the first three steel pipe sections, the subsequent pipe sections are transported into the hole (2 sections per day, 4m per section), transported to about 3m away from the front grouting, then welded, after the front grouting is completed, the two sections are spliced by the winch and the front section, then welded and grouted, and the subsequent construction is carried out in this order. If the transportation conditions in the tunnel allow, the length of a single pipe section can be appropriately lengthened, the total construction period can be compressed, and the pressure of tunnel repair progress can be reduced.

[0055] S5: Repeat the above steps until all steel pipe sections are transported, positioned and installed to complete the repair work of the diversion tunnel.

[0056] The method in the application greatly reduces the cost in the repair process of the diversion tunnel in the above construction project, mainly reflected in: first, the whole large-diameter steel pipe is transported by using the track and the transportation tool, after the steel pipe is processed outside the field, it is quickly transported in whole sections to the designated repair position, thereby avoiding the welding of the large-diameter steel pipe after being divided into blocks and then assembled into sections, improving the safety, saving the time, reducing the equipment and labor costs, the processed transportation tool can be reused, and the material consumption is saved; the steel pipe positioning between the sections is quickly realized by using the forward and reverse wire pull rod, the 7-shaped plate and the wedge block, thereby reducing the equipment cost; after the whole steel pipe and the grouting pipe reserved on the wall top are used, the steel pipe wall is filled once, thereby saving the material transportation mechanical cost and the labor cost in the hole. In summary, the main economic benefit analysis of the above repair construction method is as follows: the total cost is saved by 2.179 million yuan (labor cost 994,000 yuan, material and equipment cost 395,000 yuan, management cost 774,000 yuan, and other cost 16,000 yuan).

[0057] In addition, the above construction method successfully solves the repair of long-distance, small-section water diversion tunnel steel pipe lining reconstruction, and the repair quality is excellent, without damage and water leakage, and obtains high evaluation from Fuzhou Water Quality Supervision Station, Fuzhou Metro, design, supervision and people in the industry of Tiejian, shortens the owner's water supply time by 35 days, successfully ensures the normal production and living water of Fuqing and Pingtan. Moreover, the whole construction process has the characteristics of classic energy saving, environmental protection, green and low carbon, and the environmental protection benefit is obvious. The guide rail and transportation tool adopted in the construction process can be recycled after the construction is completed, saving the use of steel materials, and the energy saving benefit is significant.

[0058] The above construction method is successfully applied to the repair project of Xia'nan to Xingju water diversion tunnel of Minjiang Water Diversion Project in Fuqing City, and the problem of steel pipe transportation and lining reconstruction repair in the tunnel with variable and narrow section is solved in time by using the technology. The method is safe and reliable in construction, and can greatly save time cost. The transportation tool equipment proposed by the technology has strong reconstruction performance, can be designed and processed according to different sizes, different weights of components and complex transportation environment, and can be popularized.

[0059] The above is only one embodiment of the present application, which is described in detail, but it cannot be understood as a limitation on the scope of the present application. It should be noted that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A method for transporting and installing steel pipes for repairing small-diameter water diversion tunnels, characterized in that, The method specifically includes the following steps: S1: Laying transport rails in the invert arch area of ​​the water diversion tunnel: First, determine the minimum diameter and boundary dimensions of the water diversion tunnel before construction, and remove the concrete in the track laying area and backfill the bare section with concrete. Then, lay sleepers to level the bottom surface of the track, and finally install the transport rails on the sleepers. S2: Transportation of steel pipes used for tunnel repair: ① The steel pipes are transported in sections, each section being 3-5 meters long. First, the first section is hoisted onto the rails laid at the tunnel entrance. Steel pipe transport fixtures are then installed at both ends of the section. These fixtures include a support platform, a jack working platform, a steering and fixing platform, and a connecting plate. The bottom of the support platform is equipped with steel wheels that match the transport rails inside the tunnel. The jack working platform is fixed to the end of the support platform adjacent to the steel pipe to be transported via a first support. The steering and fixing platform is installed on the jack via a second support. Above the jacking platform, the connecting plate is fixed to the steering platform via a lifting shaft, and extends into the steel pipe to be transported. It is connected to the support plate welded to the inner wall of the steel pipe section via a spiral. A jack is installed on the jacking platform, with the lifting end of the jack in contact with the connecting plate. The jack is used to lift the connecting plate upward, which in turn lifts the steel pipe upward. After reaching the predetermined position, a shim is used to fill the gap between the steering platform and the connecting plate. The jack is then lowered, thus completing the assembly of the steel pipe and the transport tooling. ② After the steel pipe transport equipment is connected to the steel pipe section, the electric vehicle is used to push the steel pipe transport equipment to move the steel pipe smoothly along the rail to the repair area inside the water diversion tunnel. During the transport process, when passing through narrow sections, the height of the steel pipe is adjusted by jacks so that the steel pipe can pass through the narrow section area of ​​the water diversion tunnel smoothly. Specifically, the connecting plate is raised by jacks, and the steel pipe is adjusted to a height that can pass through the tunnel area smoothly by removing or adding shims. ③ Use an electric cart to push the steel pipe transport fixture to move the steel pipe to a position 1-2 meters away from the area to be repaired inside the water diversion tunnel. Then, fix a winch on the tunnel floor in front of the steel pipe, stop the electric cart, and use the winch to pull the front transport fixture of the steel pipe to continue moving the steel pipe along the track to a position 30-50 cm away from the area to be repaired inside the water diversion tunnel. Stop dragging; loosen the connecting bolts between the connecting plates of the front and rear transport fixtures and the inner wall support plate of the steel pipe, then raise the jack and remove the gasket. Place a pad, adjust the jack to fully retract its lifting height, and once the steel pipe has contacted and settled with the rail, remove the jack and bolts, dismantle the transport fixture at the front end of the steel pipe, then weld a lifting ring onto the steel pipe. Using a hand-operated hoist and a crowbar, move the transport fixture at the front end of the steel pipe into the settled steel pipe. Continue to drag the steel pipe to the repair area inside the water diversion tunnel using a winch, then dismantle the transport fixture at the rear end of the steel pipe. Use an electric vehicle to first remove the transport fixture at the rear end of the steel pipe, and then remove the transport fixture at the front end of the steel pipe from inside the steel pipe. ④ After the steel pipe section is transported to the repair location and the transport fixtures at both ends are removed, the installation position of the steel pipe section is finely adjusted with or without the use of a winch to accurately move it to the location to be repaired. S3: Repeat step S2 to transport the second steel pipe section to the joint with the first steel pipe section. Install positive and negative threaded tie rods in the two steel pipe sections and adjust the longitudinal direction and misalignment using the positive and negative threaded tie rods. After the two steel pipes are joined, weld a 7-shaped connecting plate at the bottom misalignment and insert wedges into the gap of the 7-shaped connecting plate to adjust the misalignment flatness of the two steel pipe sections. After the adjustment is completed, weld the two steel pipe sections together. S4: After the steel pipe section is fixed, the outside of the steel pipe is filled. Before filling, grouting pipes are pre-embedded in the inner wall of the tunnel at the top of the steel pipe section, and end caps are used to seal both ends of the steel pipe section. Then, the area between the outer wall of the steel pipe section and the inner wall of the tunnel is backfilled through the pre-embedded grouting pipes. Grouting and backfilling are carried out from the front of the steel pipe section away from the tunnel entrance, and the next steel pipe section is transported according to step S2 while grouting and backfilling are being carried out. S5: After the grouting and backfilling in step S4 are completed, the newly transported steel pipe segment is spliced ​​with the backfilled steel pipe segment, and step S4 is repeated to continue backfilling the newly transported steel pipe segment, while the next steel pipe segment is transported. S6: Repeat step S5 until the entire water diversion tunnel is repaired.

2. The method for transporting and installing steel pipes for repairing small-diameter water diversion tunnels according to claim 1, characterized in that: In step S1, before the track is installed, the base surface is treated by manual demolition and mortar leveling to ensure that the track installation base surface is flat. Then, the position of the sleeper is determined by measuring and marking points, and the chiseling lines are used to determine the chiseling lines on both sides and the chiseling depth to ensure that the channel steel sleepers are laid smoothly. After the chiseling is completed, the base surface is cleaned and leveled with mortar. Then, steel plates or channel steel and I-beams are laid to level the bottom surface of the track. Finally, the rails are installed.

3. The method for transporting and installing steel pipes for repairing small-diameter water diversion tunnels according to claim 1, characterized in that: The adjustment principle in step S3 is: from large to small, from top to bottom, and symmetrical. The positive and negative threaded rods include two positive and negative threaded rods welded to the inner walls of the two steel pipe sections and an adjusting sleeve connecting the two threaded rods. The adjusting sleeve has a pry hole. The two steel pipe sections are pulled closer by rotating the adjusting sleeve with a pry bar. The two ends of the 7-shaped connecting plate are welded to the inner walls of the two steel pipe sections respectively. The wedge is inserted into the gap, and the elevation of the two steel pipe sections is adjusted by tapping the wedge.

4. The method for transporting and installing steel pipes for repairing small-diameter water diversion tunnels according to claim 1, characterized in that: In step S4, high-strength, non-shrink grout is used to fill the outside of the steel pipe section. The overall length of the steel pipe section to be grouted for the first time is 10-12m. Before transporting the steel pipe section, the grout and grouting equipment are brought to the front of the repair section. Two steel pipe sections are transported and welded at the same time as each grouting and backfilling. After the grouting and backfilling is completed, the two welded steel pipe sections are spliced ​​with the grouting and backfilling steel pipe section and then the next grouting and backfilling is carried out.

5. A method for transporting and installing steel pipes for repairing small-diameter water diversion tunnels according to claim 1, characterized in that: In step S4, a 4-6cm thick wooden board is used as a sealing mold for sealing. Two main ribs are set up, with the inner ring connected to the steel pipe at a spacing of 40-60cm, and the outer ring diagonally pulled to the steel pipe with steel bars. The grouting perforated pipe is made of steel pipe with the same length as the grouting steel pipe section. The grouting perforated pipe is fixed to the tunnel rock wall with expansion bolts. The grouting perforated pipe is laid along the extension direction of the tunnel, and a grout discharge port is set on the side of the grouting perforated pipe adjacent to the steel pipe section.

6. A steel pipe transport fixture for repairing small-diameter water diversion tunnels, characterized in that: The transport fixture is used to transport steel pipes in the steel pipe transport and installation method for repairing small-diameter water diversion tunnels as described in any one of claims 1 to 5. The transport fixture includes a support platform (1), a jack working platform (2), a turning and fixing platform (7), and a connecting plate (3). The bottom of the support platform (1) is provided with steel wheels (4) that match the transport rails inside the tunnel. The jack working platform (2) is fixed to one end of the support platform (1) near the steel pipe (6) to be transported by a first support (5). The turning and fixing platform (7) is installed above the jack working platform (2) by a second support (8). The connecting plate (3) is fixed to the turning and fixing platform (7) by a lifting shaft (11), and the connecting plate (3) extends into the steel pipe (6) to be transported and is connected to the steel pipe (6) to be transported by a connecting member (9). The connecting member (9) includes a support plate welded to the inner wall of the steel pipe (6) to be transported. The connecting plate (3) is a support plate with corresponding bolt connection holes. The connecting plate (3) is fixedly connected to the support plate by connecting bolts. The steering fixed platform (7) has a circular support platform (700) in the middle and a rotating shaft insertion hole is opened at the center of the circular support platform (700). The lifting rotating shaft (8) is a metal shaft with an enlarged head at one end. Its length is greater than the lifting height of the jack installed on the jack working platform (2). The connecting plate (3) has a rotating shaft insertion hole that matches the rotating shaft insertion hole. When the connecting plate (3) is placed on the steering fixed platform (7), it is movably inserted into the rotating shaft insertion hole of the connecting plate (3) and the circular support platform (700) through the lifting rotating shaft (11). After the jack is installed on the jack working platform (2), the jack drives the connecting plate (3) to move up and down along the lifting rotating shaft (11). During the lifting process, a support pad is provided between the connecting plate (3) and the steering fixed platform (7).

7. A steel pipe transport fixture for repairing small-diameter water diversion tunnels according to claim 6, characterized in that: The support platform (1) is a square platform with steel wheels (4) installed at the four corners of the bottom. A connecting ear plate (10) is provided on the side of the first support (5) away from the steel pipe (6) to be transported. The width of the jack working platform (2) is greater than the width of the turning fixed platform (7). Jack supports (200) are symmetrically installed at the two ends of the jack working platform (2). After the jack is installed on the jack support (200), the lifting end of the jack contacts the connecting plate (3). The second support (8) is located between the two jack supports (200).

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