Construction method of ultra-long large-section pipe-in-pipe structure and auxiliary grouting device

Abstract

The invention relates to the technical field of municipal pipeline construction, in particular to a construction method of an ultra-long large-section pipe-in-pipe structure, which comprises the following steps: S1, excavating a working pit; s2, mounting a lining pipe; s3, grouting is conducted on a grouting gap between the lining pipe and the concrete pipeline; S31, single-end plugging is conducted on the grouting gap; s32, an auxiliary grouting device is installed; s33, the auxiliary grouting device crawl at a fixed distance; s34, self-plugging of the auxiliary grouting device is carried out; s35, grouting the partition cavity; s36, performing initial setting on the slurry; s37, the auxiliary grouting device crawl again at a fixed distance; s38, the steps S34 to S37 are repeated until the grouting gap is completely filled; s4, backfilling the working pit; the auxiliary grouting device climbs along the inner wall of the concrete pipeline at equal intervals, so that the grouting gap is conveniently divided into a plurality of partition cavities, the partition cavities are filled section by section, the situation that the grouting gap cannot be completely filled due to insufficient grouting pressure caused by the fact that the filling length of the grouting gap is too large is avoided, and the grouting quality of the ultra-long large-section pipe-in-pipe structure is improved.

Description

Technical Field

[0001] The present application relates to the technical field of municipal pipeline construction, and in particular to a construction method and an auxiliary grouting device for a pipe-in-pipe structure with an ultra-long cross-section. Background Art

[0002] As urban infrastructure construction continues to expand underground, the use of long-distance, large-diameter underground pipelines is increasing. Currently, underground pipelines mainly include corrugated pipe structures, concrete pipe structures, and pipe-in-pipe structures. The pipe-in-pipe structure is mainly used in drainage systems, integrated pipeline corridors, sponge city construction, and road underground pipeline network renovation.

[0003] The pipe-in-pipe structure in the prior art includes a concrete pipe and a multi-section liner pipe. The concrete pipe is buried underground, and the multi-section liner pipe is arranged inside the concrete pipe. The adjacent two sections of the liner pipe are welded by hot-melt welding at the joints with a hot-melt tape wrapped thereon, and the gap between the liner pipe and the concrete pipe is filled with cement slurry. During the construction of the pipe-in-pipe structure, first, the entire pipeline to be constructed is divided into multiple working sections, and a working pit is excavated in each working section to allow the concrete pipe to partially leak out. Then, the first section of the liner pipe is hoisted into the working pit, and the liner pipe is then Two steel bars are placed horizontally at the bottom of the concrete pipe as support for the liner pipe. The first section of the liner pipe is pushed into the concrete pipe and partially leaks out. The second section of the liner pipe is hoisted in, and the second section of the liner pipe is connected to the first section of the liner pipe and hot-melt welded. The above steps are repeated until all the liner pipes are in the concrete pipe. Then, both ends of the gap formed by the concrete pipe and the liner pipe are sealed with bricks, and grouting holes and slurry outlet holes are reserved. A single large-volume grouting is carried out into the gap between the concrete pipe and the liner pipe through the grouting holes and maintained. Finally, the working pit is backfilled.

[0004] When using the above-mentioned related pipe-in-pipe structure construction method, during the grouting process of the super-long and large-section pipe-in-pipe structure, due to the large length of the grouting gap in the pipe-in-pipe structure, when the grouting pressure is insufficient, the grouting gap of the pipe-in-pipe structure away from the grouting port cannot be completely filled, affecting the grouting quality of the super-long and large-section pipe-in-pipe structure. Summary of the Invention

[0005] In order to improve the grouting quality of an ultra-long and large cross-section pipe-in-pipe structure, the present application provides a construction method and an auxiliary grouting device for an ultra-long and large cross-section pipe-in-pipe structure.

[0006] In a first aspect, the present application provides a construction method for an ultra-long cross-section pipe-in-pipe structure, which adopts the following technical solution: A construction method for an ultra-long cross-section pipe-in-pipe structure, comprising the following steps: S1. Excavation of working pit: Excavate working pits at both ends of the concrete pipe to be constructed, and partially expose the concrete pipe; S2. Liner Pipe Installation: Lay a steel frame at the bottom of the concrete pipe and use it as support for the liner pipe. Hoist the liner pipe into the working pit and use a traction device to pull it into the concrete pipe cavity. S3. Grouting gap between lining pipe and concrete pipe: S31. Single-end plugging of grouting gap; S32. Auxiliary grouting device installation: The auxiliary grouting device is mounted on the inner liner, and the auxiliary grouting device is slidably abutted against the inner wall of the concrete pipe; S33. Auxiliary grouting device crawling at a fixed distance: The auxiliary grouting device crawls along the inner wall of the concrete pipe until the distance between the auxiliary grouting device and the grouting gap plugging end is 950cm-1050cm; S34. Auxiliary grouting device self-sealing: The airbag in the auxiliary grouting device expands, forming a partition cavity between the auxiliary grouting device and the sealing end of the grouting gap; S35. Grouting the partition cavity: Grouting is performed into the partition cavity through the grouting holes of the auxiliary grouting device until the slurry in the partition cavity flows out through the overflow holes of the auxiliary grouting device; S36. Initial setting of slurry; S37. The auxiliary grouting device crawls again at a fixed distance: The auxiliary grouting device crawls along the inner wall of the concrete pipe until the distance between the auxiliary grouting device and the primary setting slurry is 950cm-1050cm; S38. Repeat steps S34-S37 until the grouting gap is completely filled; S4. Backfill the working pit.

[0007] By adopting the above technical solution, first, a working pit is excavated at both ends of the concrete pipe to be constructed, and the concrete pipe is partially leaked; then, a steel frame is laid at the bottom of the concrete pipe, and the steel frame is used as a support for the inner lining pipe, and then the end of the inner lining pipe is placed on the steel frame, and the inner lining pipe is pulled into the inner cavity of the concrete pipe by a traction device; bricks and concrete are used to seal one end of the grouting gap, and an auxiliary grouting device is set on the inner lining pipe, and the auxiliary grouting device is adjusted so that the auxiliary grouting device and the inner lining pipe are aligned. The inner wall of the concrete pipe is slidably abutted, and the grouting pipe is installed. Then, the auxiliary grouting device is driven to crawl along the inner wall of the concrete pipe. When the distance from the grouting gap blocking end is 950cm-1050cm, the auxiliary grouting device is limited. The auxiliary grouting device is adjusted to expand the air bag of the auxiliary grouting device to form a partition cavity between the auxiliary grouting device and the grouting gap blocking end. The pressure pump is adjusted to grout into the partition cavity through the grouting hole until the slurry flows out along the overflow hole. The grouting is stopped and the pipe is static. The auxiliary grouting device is adjusted again to crawl along the inner wall of the concrete pipe until the distance between the auxiliary grouting device and the first slurry in the initial setting is 950cm-1050cm. The auxiliary grouting device is limited. The auxiliary grouting device is adjusted to expand the air bag of the auxiliary grouting device to form a partition cavity between the auxiliary grouting device and the sealing end of the grouting gap. The pressure pump is adjusted to grout into the partition cavity through the grouting hole until the slurry flows out along the overflow hole and stops. Grouting, wait until the slurry in the second partition cavity is in the initial setting state, repeat the above operation until the grouting gap is completely filled; finally, backfill the working pit; the designed construction method of the super-long cross-section pipe-in-pipe structure uses an auxiliary grouting device to crawl equidistantly along the inner wall of the concrete pipe, so as to facilitate the division of the grouting gap into multiple partition cavities, and realize the segmented filling of multiple partition cavities, avoiding the grouting gap from being unable to be completely filled due to insufficient grouting pressure due to the filling length of the grouting gap being too long, thereby improving the grouting quality of the super-long cross-section pipe-in-pipe structure.

[0008] Optionally, the steel skeleton includes multiple supporting parts and connecting parts connecting two adjacent supporting parts, and the multiple supporting parts are arranged in sequence along the length direction of the concrete pipe; the connecting part is fixedly connected to the supporting part, the connecting part is arranged along the length direction of the concrete pipe, and the connecting part is in contact with the inner lining pipe.

[0009] By adopting the above technical solution, the steel frame arranged in sections can be easily connected to the connecting parts through the supporting parts. At the same time, the support for the lining pipe is achieved, which makes it convenient to pull the lining pipe along the steel frame so that the lining pipe and the concrete pipe are in a concentric state; through the connecting parts, it is convenient to fix and connect two adjacent supporting parts.

[0010] Optionally, two connecting portions are provided between two adjacent supporting portions, and the two connecting portions are symmetrically distributed with respect to the supporting portions.

[0011] By adopting the above technical solution, the two connecting parts are designed to facilitate the guidance and limitation of the inner lining pipe in the traction state, prevent the inner lining pipe from falling off along the steel skeleton, and ensure that the inner lining pipe and the concrete pipe are in a concentric state.

[0012] Optionally, the S2 includes: S21. Welding and installation of steel frame; S22. Use a crane to hoist the first section of the short inner lining pipe into the working pit. The short inner lining pipe is a 200-300 cm long polyethylene spiral corrugated pipe. S23, the first section of the lining short pipe is pushed into the concrete pipe and partially leaks out; S24, hoisting in the next section of lining short pipe, butting the next section of lining short pipe against the previous section of lining short pipe and then performing heat-fusion welding; S25, using a traction device to pull the hot-melt welded liner short pipe into the concrete pipe, and causing the last section of the hot-melt welded liner short pipe to partially leak out; S26. Repeat steps S24-S25 until all the lining short pipes are pulled into the concrete pipe.

[0013] By adopting the above technical solution, first, the steel skeleton is welded and installed, and then the first section of the lining short pipe is hoisted into the working pit by a crane. The lining short pipe is a polyethylene spiral corrugated pipe with a length of 200-300 cm, and the first section of the lining short pipe is pushed into the concrete pipe along the steel skeleton, and the first section of the lining short pipe partially leaks out; then the next section of the lining short pipe is hoisted into the working pit, and the next section of the lining short pipe is butt-jointed with the previous section of the lining short pipe and then hot-melt welded; a traction device is used to pull the hot-melt-welded lining short pipe into the concrete pipe, and the last section of the lining short pipe partially leaks out, and the above steps are repeated until all the lining short pipes are pulled into the concrete pipe; the designed lining pipe installation steps facilitate the installation of the lining pipe and, at the same time, improve the installation accuracy of the lining pipe.

[0014] In a second aspect, the present application provides an auxiliary grouting device, which adopts the following technical solution: An auxiliary grouting device is used in a construction method of a pipe-in-pipe structure with an ultra-long cross-section, comprising an auxiliary support frame, multiple pulley mechanisms, and a sealing mechanism; The auxiliary support frame is sleeved on the inner lining pipe, and a notch is opened on the auxiliary support frame for the steel bar skeleton to pass through; The auxiliary support frame is provided with grouting holes for installing grouting pipes; The auxiliary support frame is provided with a grouting hole, and the grouting hole is arranged near the top of the concrete pipe; The pulley mechanism is installed on the auxiliary support frame, and the pulley mechanism is used to drive the auxiliary support frame to move along the axial direction of the concrete pipe; The sealing mechanism includes an inflation tube, an air bag and an air pump; The airbag is mounted on the auxiliary support frame, and the airbag is wound around the peripheral wall of the auxiliary support frame; The inflation tube is installed on the auxiliary support frame, and one end of the inflation tube is connected to the air bag, and the other end is connected to the air pump.

[0015] By adopting the above technical solution, first, the auxiliary support frame is sleeved on the inner lining pipe, and the notch of the auxiliary support frame is facing the steel skeleton; then, the pulley mechanism is adjusted to drive the pulley mechanism to slide along the inner wall of the concrete pipe, and when it moves to the sealing end of the gap between the auxiliary support frame and the grouting or the distance between the auxiliary support frame and the initial setting slurry meets the requirements, the auxiliary support frame self-locks and limits, and the air pump is adjusted to inflate the airbag, and the airbag expands until the airbag is tightly pressed against the inner wall of the concrete pipe and the outer wall of the inner lining pipe, thereby achieving the sealing of the gap between the auxiliary support frame and the concrete pipe; grouting is then injected into the inner cavity of the partition cavity through the grouting hole. As the slurry is continuously injected, the gas in the partition cavity is gradually discharged along the overflow hole until the slurry in the partition cavity is discharged along the overflow hole. The gas in the airbag is gradually discharged, and the pulley mechanism is adjusted to grout the next partition cavity. The designed auxiliary grouting device facilitates adjustment of the distance between the auxiliary support frame and the sealing end of the grouting gap or the distance between the auxiliary support frame and the initial setting slurry through the sliding auxiliary support frame, thereby realizing the segmented filling of multiple partition cavities, avoiding the grouting gap from being completely filled due to insufficient grouting pressure caused by the filling length of the grouting gap being too large, and improving the grouting quality of the pipe-in-pipe structure with ultra-long cross-section. At the same time, the sealing mechanism facilitates the sealing of the gaps between the auxiliary support frame and the concrete pipe and between the airbag and the outer wall of the liner pipe.

[0016] Optionally, the pulley mechanism includes a limiting ring, two guide rings, two sets of auxiliary support legs and an adjustment component; The limiting ring is coaxially fixed to the auxiliary support frame, and the limiting ring is located on the side of the blocking end of the auxiliary support frame away from the grouting gap; The two guide slip rings are coaxially sleeved on the limiting ring, and the guide slip rings slide along the axial direction of the limiting ring; The two groups of auxiliary support legs are respectively installed on the guide slip ring, and one end of the auxiliary support leg is rotatably connected to the guide slip ring; The adjusting assembly is mounted on the limiting ring, and the adjusting assembly drives the two groups of auxiliary supporting legs to move closer to or farther away from one end of the guide slip ring.

[0017] By adopting the above technical solution, the adjustment component is adjusted, and the adjustment component drives the two groups of auxiliary support legs to move away from one end of the guide slip ring or closer to each other. Since the auxiliary support legs are rotatably connected to the guide slip ring, the distance between the end of the auxiliary leg away from the guide slip ring and the limit ring changes; the designed pulley mechanism facilitates the adjustment of the distance between the end of the auxiliary support leg away from the guide slip ring and the limit ring, thereby facilitating the auxiliary grouting device to slide along the inner wall of concrete pipes of different diameters, thereby improving the applicability of the auxiliary grouting device.

[0018] Optionally, at least three auxiliary support legs are provided in each group.

[0019] By adopting the above technical solution, at least three auxiliary support legs are set in each group, which is convenient for supporting the limit ring and the guide ring, so that the limit ring and the concrete pipe are in a concentric state, thereby facilitating the auxiliary grouting device to slide along the inner wall of the concrete pipe.

[0020] Optionally, the adjustment assembly includes a drive motor, a bidirectional screw and a plurality of hinged rods; The bidirectional screw passes through the two guide slip rings, and the two guide slip rings are respectively threadedly connected to the positive thread section of the bidirectional screw and the negative thread section of the bidirectional screw; The driving motor is mounted on the limiting ring, and the output shaft of the driving motor is coaxially connected to the bidirectional screw; One end of the hinged rod is hinged to the limiting ring, and the other end is hinged to the auxiliary support leg.

[0021] By adopting the above technical solution, the driving motor is adjusted, and the output shaft of the driving motor drives the bidirectional screw to rotate, the bidirectional screw drives the guide slip rings to move closer or farther away from each other, and the guide slip rings drive the auxiliary support legs to move synchronously. Since one end of the hinged rod is hinged to the limit ring and the other end is hinged to the auxiliary support leg, the auxiliary support leg rotates along the hinge axis of the hinged rod and the auxiliary leg, thereby achieving the two groups of auxiliary support legs moving away from one end of the guide slip ring to move closer or farther away from each other; the designed adjustment component is convenient for applying force to the guide slip ring, so that the two guide slip rings move closer or farther away from each other, achieving synchronous rotation of the two groups of auxiliary support legs, and thereby achieving the distance adjustment between the end of the auxiliary leg away from the guide slip ring and the limit ring, thereby facilitating the sliding of the auxiliary grouting device along the inner wall of concrete pipes of different diameters.

[0022] Optionally, the auxiliary support leg includes an auxiliary support portion, a roller portion, a rotating shaft, a rotating motor and a linkage member; One end of the auxiliary support portion is rotatably connected to the guide slip ring, and the rotating shaft is rotatably connected to one end of the auxiliary support portion away from the guide slip ring; The roller portion is coaxially mounted on the rotating shaft; The rotating motor is mounted on the auxiliary support portion, and the rotating motor drives the rotating shaft to rotate through a linkage member.

[0023] By adopting the above technical solution, the rotating motor is adjusted, and the output shaft of the rotating motor drives the linkage part to move, the linkage part drives the rotating shaft to rotate, and the rotating shaft drives the roller part to rotate. Since the roller part slides tightly against the inner wall of the concrete pipe, the friction between the roller part and the inner wall of the concrete pipe causes the roller part to roll and slide along the inner wall of the concrete pipe; the designed auxiliary support leg facilitates driving the roller part to rotate, thereby realizing the rolling and sliding of the auxiliary grouting device along the inner wall of the concrete pipe.

[0024] Optionally, a limiting mechanism is also included, the limiting mechanism includes multiple groups of limiting components, the multiple groups of limiting components are evenly distributed along the circumferential direction of the auxiliary support frame, the limiting components include a limiting cylinder and an arc-shaped limiting plate, the limiting cylinder is installed on the auxiliary support frame, and the piston rod of the limiting cylinder is arranged along the radial direction of the auxiliary support frame, and the arc-shaped limiting plate is installed on the piston rod of the limiting cylinder.

[0025] By adopting the above technical solution, the limit cylinder is adjusted, and the piston rod of the limit cylinder drives the arc-shaped limit plate to move along the radial direction of the concrete pipe. When the arc-shaped limit plate is pressed against the inner wall of the concrete pipe, the auxiliary support frame is limited. The designed limit mechanism facilitates the limitation of the auxiliary support frame, thereby achieving the limitation of the auxiliary grouting device, improving the limitation accuracy of the auxiliary grouting device, and thus improving the grouting quality of the grouting gap.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. The designed construction method for the extra-long cross-section pipe-in-pipe structure uses an auxiliary grouting device that crawls evenly along the inner wall of the concrete pipe, facilitating the division of the grouting gap into multiple partition cavities. This allows for the segmented filling of multiple partition cavities, thus avoiding the incomplete filling of the grouting gap due to insufficient grouting pressure caused by excessive filling length of the grouting gap. This improves the grouting quality of the extra-long cross-section pipe-in-pipe structure. 2. The designed auxiliary grouting device, through the sliding auxiliary support frame, is convenient for adjusting the distance between the auxiliary support frame and the grouting gap sealing end or the auxiliary support frame and the initial setting slurry, so as to realize the segmented filling of multiple partition cavities and improve the grouting quality of the ultra-long long cross-section pipe-in-pipe structure; at the same time, the sealing mechanism facilitates the sealing of the gap between the auxiliary support frame and the concrete pipe and between the air bag and the outer wall of the inner liner pipe; the pulley mechanism facilitates the adjustment of the distance between the end of the auxiliary support leg away from the guide ring and the limit ring, thereby facilitating the sliding of the auxiliary grouting device along the inner wall of concrete pipes of different diameters, thereby improving the applicability of the auxiliary grouting device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic structural diagram of a steel skeleton in a construction method of a super-long cross-section tube-in-tube structure in Example 1 of the present application; Figure 2 This is a schematic diagram of the overall structure of the auxiliary grouting device in Example 1 of the present application; Figure 3 This is a schematic diagram of the overall structure of the auxiliary grouting device of Example 1 of the present application from another perspective; Figure 4 yes Figure 3 A magnified schematic diagram of part A; Figure 5 yes Figure 3 An enlarged schematic diagram of part B.

[0028] Explanation of the accompanying drawings: 01, inner lining pipe; 1, steel skeleton; 11, connecting part; 12, supporting part; 2, auxiliary support frame; 21, notch; 22, grouting hole; 23, overflow hole; 3, sealing mechanism; 31, air bag; 32, inflation tube; 33, air pump; 4, limiting mechanism; 41, limiting assembly; 411, limiting cylinder; 412, arc-shaped limiting plate; 5, pulley mechanism; 51, limiting ring; 511, first opening; 52, guide ring; 521, second opening; 53, auxiliary support leg; 531, auxiliary support part; 532, roller part; 533, rotating shaft; 534, linkage; 5341, driving bevel gear; 5342, driven bevel gear; 535, rotating motor; 54, adjusting assembly; 541, driving motor; 542, bidirectional screw; 543, articulated rod. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-5 This application is described in further detail.

[0030] In a first aspect, an embodiment of the present application discloses a construction method for an ultra-long and large cross-section pipe-in-pipe structure.

[0031] A construction method for an ultra-long cross-section pipe-in-pipe structure, comprising the following steps: S1. Excavation of working pit: Excavate working pits at both ends of the concrete pipe to be constructed, and partially expose the concrete pipe. In this embodiment, the height of the working pit is 220 cm, the width is 300 cm, and the length is 500 cm.

[0032] S2. Installing the liner 01: Lay a steel skeleton 1 at the bottom of the concrete pipe and use it as support for the liner 01. Hoist the liner 01 into the working pit and use a traction device to pull the liner 01 into the concrete pipe cavity. Reference Figure 1, the steel skeleton 1 includes a plurality of support portions 12 and a connecting portion 11 connecting two adjacent support portions 12, the plurality of support portions 12 are arranged in sequence along the length direction of the concrete pipe, and two connecting portions 11 are provided between two adjacent support portions 12, and the two connecting portions 11 are symmetrically distributed about the support portion 12, the connecting portion 11 is fixedly connected to the support portion 12, and, in this embodiment, the connecting portion 11 is provided near the top of the support portion 12 to facilitate stable support of the inner liner 01, the connecting portion 11 is provided along the length direction of the concrete pipe, and the connecting portion 11 is fitted with the inner liner 01, the length of the connecting portion 11 in this application can be 300cm, 400cm, or 500cm, as long as the fixed connection between the two adjacent support portions 12 is achieved and the inner liner 01 is stably supported, in this embodiment, the length of the connecting portion 11 is set to 400cm; S21, welding and installation of steel frame 1; S22. Use a crane to hoist the first section of the short inner lining pipe into the working pit. The short inner lining pipe is a 200-300 cm long polyethylene spiral corrugated pipe. S23. The first section of the lining short pipe is pushed into the concrete pipe and partially leaks out. The leaked length of the lining short pipe is 1 / 3 of the total length of the lining short pipe. S24, hoisting in the next section of lining short pipe, butting the next section of lining short pipe against the previous section of lining short pipe and then performing heat-fusion welding; S25. Use a traction device to pull the heat-melt-welded liner short pipe into the concrete pipe, and allow the last section of the heat-melt-welded liner short pipe to partially leak out. During the traction process, the liner short pipe is gradually pulled by opening a traction hole in the first liner short pipe, passing one end of a traction rope through the traction hole and tying it, and tying the other end to the traction device. S26. Repeat steps S24-S25 until all the lining short pipes are pulled into the concrete pipe.

[0033] S3. Grouting of the gap between the inner lining pipe 01 and the concrete pipe: S31. Single-end sealing of the grouting gap: Bricks are laid in the grouting gap. After the bricks are laid, concrete is applied to seal one end of the grouting gap. S32 auxiliary grouting device installation: the auxiliary grouting device is set on the inner liner 01, and the auxiliary grouting device of the plurality of roller portions 532 are sliding against the inner wall of the concrete pipe; S33. The auxiliary grouting device crawls along the inner wall of the concrete pipe until the distance between the auxiliary grouting device and the sealing end of the grouting gap is 950 cm to 1050 cm. In this embodiment, the distance between the auxiliary grouting device and the sealing end of the grouting gap is 1000 cm. The auxiliary grouting device self-locks in position. When the grouting position of the auxiliary grouting device and the support portion 12 are located in the same cross-section, the position of the auxiliary grouting device is adjusted so that the auxiliary grouting device and the support portion 12 are staggered to prevent interference between the auxiliary grouting device and the support portion 12. S34. Auxiliary grouting device self-sealing: The auxiliary grouting device 31 bulges, bulges to the inner wall of the concrete pipe and the outer wall of the liner 01 and the bladder 31, forming a partition cavity between the auxiliary grouting device and the sealing end of the grouting gap; S35. Grouting of the partition cavity: Grouting is performed through the grouting hole 22 of the auxiliary grouting device into the partition cavity until the slurry in the partition cavity flows out along the overflow hole 23 of the auxiliary grouting device. In this application, the grouting hole 22 is provided near the bottom of the concrete pipe, and the overflow hole 23 is provided near the bottom of the concrete pipe; S36. Initial setting of the slurry: In this embodiment, an early setting agent is added to the slurry to improve the setting efficiency of the slurry. In this embodiment, the initial setting time of the slurry is set to 90min-120min; S37. The auxiliary grouting device crawls again at a fixed distance: The auxiliary grouting device crawls along the inner wall of the concrete pipe until the distance between the auxiliary grouting device and the primary setting slurry is 950cm-1050cm; S38. Repeat steps S34-S37 until the grouting gap is completely filled. When grouting the last partition cavity, remove the auxiliary grouting device from the grouting gap, seal the other end of the grouting gap, and reserve a grouting hole 22 and a grouting hole 23 at the rear sealed end of the grouting gap. Grouting can be performed through the grouting hole 22 reserved at the rear sealed end of the grouting gap. S4. Backfilling the working pit: Clean the working pit and remove the accumulated water in the working pit, then compact and backfill it in layers.

[0034] In a second aspect, an embodiment of the present application discloses an auxiliary grouting device.

[0035] Reference Figure 2 and Figure 3 An auxiliary grouting device is used for the construction method of an ultra-long cross-section pipe-in-pipe structure, including an auxiliary support frame 2, a limiting mechanism 4, a sealing mechanism 3 and a pulley mechanism 5. The sealing mechanism 3, the limiting mechanism 4 and the pulley mechanism 5 are all installed on the auxiliary support frame 2, and the sealing mechanism 3, the limiting mechanism 4 and the pulley mechanism 5 are distributed in sequence along the axial direction of the auxiliary support frame 2.

[0036] Reference Figure 2and Figure 3 The auxiliary support frame 2 is sleeved on the inner lining pipe 01, and a notch 21 is provided on the auxiliary support frame 2 for the steel skeleton 1 to pass through. In this embodiment, the auxiliary support frame 2 is a circular frame plate, which is coaxially arranged with the concrete pipe, and the notch 21 is located at the bottom of the circular frame plate, so that the auxiliary support frame 2 can pass through the steel skeleton 1 during movement; the auxiliary support frame 2 is provided with a grouting hole 22 for installing a grouting pipe, and the grouting hole 22 is arranged near the bottom of the concrete pipe; the auxiliary support frame 2 is provided with an overflow hole 23, and the overflow hole 23 is arranged near the top of the concrete pipe; in addition, a battery, a camera, a signal transmitter and a display are installed on the auxiliary support frame 2, and the battery, camera, signal transmitter and display are electrically connected so that the camera can capture the image in the inner cavity of the concrete pipe, and convert the sound and light signals into electrical signals, and then transmit the electrical signals to the signal transmitter, and transmit them to the signal transmitter, and the signal transmitter then transmits the signals to the display, so that the staff can observe the image in the inner cavity of the concrete pipe in real time.

[0037] Reference Figure 3 and Figure 4 The sealing mechanism 3 includes an inflation tube 32, an airbag 31 and an air pump 33; a groove is provided on the peripheral wall of the auxiliary support frame 2, the airbag 31 is installed on the auxiliary support frame 2, and the airbag 31 is wrapped around the peripheral wall of the auxiliary support frame 2, and the airbag 31 is partially embedded in the groove, so as to facilitate the sealing of the gap between the auxiliary support frame 2 and the inner wall of the concrete pipe and the airbag 31 and the outer wall of the inner liner pipe 01; the inflation tube 32 is installed on the auxiliary support frame 2, and one end of the inflation tube 32 is connected to the airbag 31, and the other end is connected to the air pump 33, and the air pump 33 is installed on the auxiliary support frame 2, so as to facilitate the inflation and exhaust of the airbag 31.

[0038] Reference Figure 3 and Figure 4 The limiting mechanism 4 includes multiple groups of limiting components 41. In this application, the limiting components 41 can be three groups, four groups, or five groups, as long as the limiting of the auxiliary support frame 2 is achieved. In this embodiment, the limiting components 41 are set to three groups, and the three groups of limiting components 41 are evenly distributed along the circumferential direction of the auxiliary support frame 2; the limiting component 41 includes a limiting cylinder 411 and an arc-shaped limiting plate 412. The limiting cylinder 411 is installed on the auxiliary support frame 2, and the piston rod of the limiting cylinder 411 is set along the radial direction of the auxiliary support frame 2, and the arc-shaped limiting plate 412 is installed on the piston rod of the limiting cylinder 411. The arc-shaped limiting plate 412 is driven by the limiting cylinder 411 to press against the inner wall of the concrete pipe to achieve the limiting of the auxiliary support frame 2.

[0039] Reference Figure 3 and Figure 5, the pulley mechanism 5 is installed on the auxiliary support frame 2, and the pulley mechanism 5 is used to drive the auxiliary support frame 2 to move along the axial direction of the concrete pipe; the pulley mechanism 5 includes a limit ring 51, two guide sliding rings 52, two sets of auxiliary support legs 53 and an adjustment component 54, the limit ring 51 is coaxially fixed with the auxiliary support frame 2, and the limit ring 51 is located on the side of the sealing end of the auxiliary support frame 2 away from the grouting gap, the limit ring 51 is provided with a first opening 511 at the position opposite to the notch 21 to avoid interference between the limit ring 51 and the steel skeleton 1; the two guide sliding rings 52 are coaxially sleeved on the limit ring 51, and the two guide sliding rings 52 are fixed along the axial direction of the limit ring 51 The support frame 2 is provided with a plurality of support legs 53, each of which is provided with a plurality of support legs 53. The support legs 53 are connected to the support frame 2 by sliding. The circumferential direction of the slip ring 52 is uniformly distributed; the auxiliary support leg 53 includes an auxiliary support portion 531, a roller portion 532, a rotating shaft 533, a rotating motor 535 and a linkage 534. One end of the auxiliary support portion 531 is rotatably connected to the guide slip ring 52, and the rotating shaft 533 is rotatably connected to the end of the auxiliary support portion 531 away from the guide slip ring 52; the roller portion 532 is coaxially mounted on the rotating shaft 533. In this embodiment, the roller portion 532 and the rotating shaft 533 are key-connected to facilitate the synchronous rotation of the roller portion 532 and the rotating shaft 533; the rotating motor 535 is mounted on the auxiliary support portion 531, and the rotating motor 535 is connected to the linkage 534 through the linkage 5 34 drives the rotating shaft 533 to rotate. In this embodiment, the linkage member 534 includes a driving bevel gear 5341 and a driven bevel gear 5342. The driving bevel gear 5341 is keyed to the output shaft of the rotating motor 535, and the driven bevel gear 5342 is coaxially connected to one end of the auxiliary support portion 531 extending from the rotating shaft 533, so as to facilitate the synchronous rotation of the driven bevel gear 5342 and the rotating shaft 533, and the driving bevel gear 5341 is meshed with the driven bevel gear 5342; in addition, the distance between the two sets of auxiliary support legs 53 gradually increases from one end of the guide slip ring 52 to one end of the concrete pipe, so as to achieve stable support of the auxiliary grouting device.

[0040] Reference Figure 3 and Figure 5, the adjustment component 54 is installed on the limiting ring 51, and the adjustment component 54 drives the two sets of auxiliary support legs 53 away from one end of the guide slip ring 52 to move closer to or away from each other; the adjustment component 54 includes a driving motor 541, a bidirectional screw 542 and a plurality of hinged rods 543, the bidirectional screw 542 is set through the two guide slip rings 52, and the two guide slip rings 52 are respectively threadedly connected with the positive thread section of the bidirectional screw 542 and the reverse thread section of the bidirectional screw 542, and the two guide slip rings 52 are about the bidirectional screw 542. The center position is symmetrically arranged; the drive motor 541 is installed on the limit ring 51. In this embodiment, the drive motor 541 is fixed to the limit ring 51 by bolts, and the output shaft of the drive motor 541 is connected to the bidirectional screw 542, and the output shaft of the drive motor 541 is fixedly connected to the bidirectional screw 542 by a coupling; in this embodiment, the number of hinged rods 543 and auxiliary support parts 531 is arranged correspondingly, and one end of the hinged rod 543 is hinged to the limit ring 51, and the other end is hinged to the auxiliary support part 531.

[0041] In addition, a controller is also installed on the auxiliary support frame 2. The controller, display, rotating motor 535, driving motor 541, limit cylinder 411 and air pump 33 are electrically connected to facilitate staff to remotely control and observe the operating status of the auxiliary grouting device.

[0042] The implementation principle of the auxiliary grouting device of the embodiment of the present application is as follows: first, the auxiliary support frame 2 is sleeved on the inner lining pipe 01, and the notch 21 of the auxiliary support frame 2 is facing the steel skeleton 1; then, the driving motor 541 is adjusted, and the output shaft of the driving motor 541 drives the bidirectional screw 542 to rotate, and the bidirectional screw 542 drives the guide sliding ring 52 to move closer or farther away from each other, and the guide sliding ring 52 drives the auxiliary support leg 53 to move synchronously. Since one end of the hinged rod 543 is hinged to the limit ring 51, and the other end is hinged to the auxiliary support leg 53, the auxiliary leg 53 is moved along the hinged rod 543 and the auxiliary leg 53. The hinge shaft rotates until the roller part 532 abuts against the inner wall of the concrete pipe; then, the rotating motor 535 is adjusted, and the output shaft of the rotating motor 535 drives the active bevel gear 5341 to rotate. Since the active bevel gear 5341 is meshed with the driven bevel gear 5342, the active bevel gear 5341 drives the driven bevel gear 5342 to rotate, and the driven bevel gear 5342 drives the rotating shaft 533 to rotate, and the rotating shaft 533 drives the roller part 532 to rotate. Since the roller part 532 slides tightly against the inner wall of the concrete pipe, the roller part 532 is pressed against the inner wall of the concrete pipe. The friction between the walls causes the roller part 532 to roll and slide along the inner wall of the concrete pipe until the distance between the auxiliary support frame 2 and the grouting gap is blocked or the distance between the auxiliary support frame 2 and the initial setting slurry meets the requirements; then adjust the limit cylinder 411, and the piston rod of the limit cylinder 411 drives the arc limit plate 412 to move along the radial direction of the concrete pipe until the arc limit plate 412 is pressed against the inner wall of the concrete pipe, realizing the self-locking limit of the auxiliary support frame 2; then adjust the air pump 33, and the air pump 33 inflates the air bag 31, and the air bag 31 expands until the air bag 31 is in contact with the concrete The inner wall of the earth pipe and the air bag 31 are pressed against the outer wall of the inner liner pipe 01 to seal the gap between the auxiliary support frame 2 and the concrete pipe; then grouting is injected into the inner cavity of the partition cavity through the grouting hole 22. As the slurry is continuously injected, the gas in the partition cavity is gradually discharged along the overflow hole 23 until the slurry in the partition cavity flows out along the overflow hole and the partition cavity is filled. Then, it is kept still for a period of time until the slurry in the partition cavity is in an initial setting state; then, the air pump 33 is adjusted to gradually discharge the gas in the air bag 31, and the pulley mechanism 5 is adjusted to grout the next partition cavity.

[0043] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A construction method for an ultra-long cross-section pipe-in-pipe structure, characterized in that: The following steps are involved: S1. Excavation of working pit: Excavate working pits at both ends of the concrete pipe to be constructed, and partially expose the concrete pipe; S2. Installation of the liner (01): Lay a steel frame (1) at the bottom of the concrete pipe and use the steel frame (1) as a support for the liner (01). Hoist the liner (01) into the working pit and use a traction device to pull the liner (01) into the inner cavity of the concrete pipe. S3. Grouting gap between lining pipe (01) and concrete pipe: S31. Single-end plugging of grouting gap; S32. Installation of auxiliary grouting device: The auxiliary grouting device is mounted on the inner liner (01), and the auxiliary grouting device is slidably abutted against the inner wall of the concrete pipe; S33. Auxiliary grouting device crawling at a fixed distance: The auxiliary grouting device crawls along the inner wall of the concrete pipe until the distance between the auxiliary grouting device and the grouting gap plugging end is 950cm-1050cm; S34. Auxiliary grouting device self-sealing: the auxiliary grouting device airbag (31) bulges, so that the auxiliary grouting device and the grouting gap between the blocking end of the partition cavity is formed; S35. Grouting the partition cavity: Grouting the partition cavity through the grouting hole (22) of the auxiliary grouting device until the slurry in the partition cavity flows out along the overflow hole (23) of the auxiliary grouting device; S36. Initial setting of slurry; S37. The auxiliary grouting device crawls again at a fixed distance: The auxiliary grouting device crawls along the inner wall of the concrete pipe until the distance between the auxiliary grouting device and the primary setting slurry is 950cm-1050cm; S38. Repeat steps S34-S37 until the grouting gap is completely filled; S4. Backfill the working pit.

2. The construction method of the super-long cross-section pipe-in-pipe structure according to claim 1, characterized in that: The steel frame (1) comprises a plurality of support portions (12) and a connecting portion (11) connecting two adjacent support portions (12), wherein the plurality of support portions (12) are arranged in sequence along the length direction of the concrete pipe; the connecting portion (11) is fixedly connected to the support portions (12), the connecting portion (11) is arranged along the length direction of the concrete pipe, and the connecting portion (11) is in contact with the inner lining pipe (01).

3. The construction method of the super-long cross-section pipe-in-pipe structure according to claim 2, characterized in that: Two connecting portions (11) are provided between two adjacent supporting portions (12), and the two connecting portions (11) are symmetrically distributed with respect to the supporting portion (12).

4. The construction method of the super-long long cross-section pipe-in-pipe structure according to any one of claim 1, characterized in that: The S2 includes: S21, welding and installation of steel frame (1); S22. Use a crane to hoist the first section of the short inner lining pipe into the working pit. The short inner lining pipe is a 200-300 cm long polyethylene spiral corrugated pipe. S23, the first section of the lining short pipe is pushed into the concrete pipe and partially leaks out; S24, hoisting in the next section of lining short pipe, butting the next section of lining short pipe against the previous section of lining short pipe and then performing heat-fusion welding; S25, using a traction device to pull the hot-melt welded liner short pipe into the concrete pipe, and causing the last section of the hot-melt welded liner short pipe to partially leak out; S26. Repeat steps S24-S25 until all the lining short pipes are pulled into the concrete pipe.

5. An auxiliary grouting device for use in the construction method of the super-long cross-section pipe-in-pipe structure according to any one of claims 1 to 4, characterized in that: It comprises an auxiliary support frame (2), a pulley mechanism (5) and a sealing mechanism (3); The auxiliary support frame (2) is sleeved on the inner lining pipe (01), and a notch (21) for the steel bar skeleton (1) to pass through is provided on the auxiliary support frame (2); The auxiliary support frame (2) is provided with a grouting hole (22) for installing a grouting pipe; The auxiliary support frame (2) is provided with a grouting hole (23), and the grouting hole (23) is arranged close to the top of the concrete pipe; The pulley mechanism (5) is installed on the auxiliary support frame (2), and the pulley mechanism (5) is used to drive the auxiliary support frame (2) to move along the axial direction of the concrete pipe; The sealing mechanism (3) comprises an inflation tube (32), an air bag (31) and an air pump (33); The airbag (31) is installed on the auxiliary support frame (2), and the airbag (31) is arranged around the peripheral wall of the auxiliary support frame (2); The inflation tube (32) is installed on the auxiliary support frame (2), and one end of the inflation tube (32) is connected to the air bag (31), and the other end is connected to the air pump (33).

6. The auxiliary grouting device according to claim 5, characterized in that: The pulley mechanism (5) comprises a limiting ring (51), two guide sliding rings (52), two sets of auxiliary support legs (53) and an adjustment component (54); The limiting ring (51) is coaxially fixed to the auxiliary support frame (2), and the limiting ring (51) is located on the side of the blocking end of the auxiliary support frame (2) away from the grouting gap; The two guide slip rings (52) are coaxially sleeved on the limiting ring (51), and the guide slip rings (52) slide along the axial direction of the limiting ring (51); The two groups of auxiliary support legs (53) are respectively installed on the guide slip ring (52), and one end of the auxiliary support leg (53) is rotatably connected to the guide slip ring (52); The adjusting assembly (54) is mounted on the limiting ring (51), and the adjusting assembly (54) drives the two groups of auxiliary support legs (53) away from one end of the guide slip ring (52) to move closer to or away from each other.

7. The auxiliary grouting device according to claim 6, characterized in that: Each group of auxiliary supporting legs (53) is provided with at least three legs.

8. The auxiliary grouting device according to claim 6, characterized in that: The adjustment assembly (54) includes a driving motor (541), a bidirectional screw (542) and a plurality of hinged rods (543); The bidirectional screw (542) is arranged to pass through the two guide slip rings (52), and the two guide slip rings (52) are respectively threadedly connected to the positive thread section of the bidirectional screw (542) and the negative thread section of the bidirectional screw (542); The driving motor (541) is mounted on the limiting ring (51), and the output shaft of the driving motor (541) is coaxially connected to the bidirectional screw (542); One end of the hinged rod (543) is hinged to the limiting ring (51), and the other end is hinged to the auxiliary support leg (53).

9. The auxiliary grouting device according to claim 6, characterized in that: The auxiliary support leg (53) includes an auxiliary support portion (531), a roller portion (532), a rotating shaft (533), a rotating motor (535), and a linkage member (534); One end of the auxiliary support portion (531) is rotatably connected to the guide slip ring (52), and the rotating shaft (533) is rotatably connected to one end of the auxiliary support portion (531) away from the guide slip ring (52); The roller portion (532) is coaxially mounted on the rotating shaft (533); The rotating motor (535) is mounted on the auxiliary support portion (531), and the rotating motor (535) drives the rotating shaft (533) to rotate via a linkage member (534).

10. The auxiliary grouting device according to claim 5, characterized in that: The invention also includes a limiting mechanism (4), wherein the limiting mechanism (4) includes a plurality of limiting assemblies (41), and the plurality of limiting assemblies (41) are evenly distributed along the circumferential direction of the auxiliary support frame (2). The limiting assembly (41) includes a limiting cylinder (411) and an arc-shaped limiting plate (412). The limiting cylinder (411) is installed on the auxiliary support frame (2), and the piston rod of the limiting cylinder (411) is arranged along the radial direction of the auxiliary support frame (2), and the arc-shaped limiting plate (412) is installed on the piston rod of the limiting cylinder (411).

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