Steel spliced pipe for replacing pipe jacking device in emergency and corresponding pipe jacking construction method

Abstract

The invention relates to a steel spliced pipe for emergently replacing a pipe jacking device and a corresponding pipe jacking construction method. Each steel splicing pipe single body is formed by folding two single-piece pipes, each single-piece pipe is in a semicircular pipe shape, straight folded edges are arranged on the edges of the two sides of each single-piece pipe, semicircular folded edges are arranged on the edges of the two ends of each single-piece pipe, the straight folded edges which are folded mutually in the two single-piece pipes are fastened through fastening bolts, and the semicircular folded edges which are folded mutually in the two steel splicing pipe single bodies are fastened through fastening bolts. The construction method comprises the steps that in pipe jacking construction, short-footage excavation is conducted in the forward direction, two single pipes are conveyed to the space excavated at the front end to be spliced into a single steel splicing pipe and connected to the front end of an existing steel splicing pipe, after one or more steel splicing pipes are installed in the mode, a front-end working pipe is jacked into the arranged steel splicing pipe, the process continues to be conducted, and the construction process is completed. And finishing the setting of the working pipe. By the adoption of the pipe jacking device, pipe jacking operation can be continuously completed under the condition that conventional pipe jacking construction is blocked.

Description

Technical Field

[0001] The invention relates to a steel pipe assembly for an emergency replacement pipe jacking device and a corresponding pipe jacking construction method. Background Art

[0002] The pipe jacking technology can realize the laying of underground pipelines without ground excavation, so that the pipelines pass under existing objects such as ground buildings, underground pipelines and riverbeds. It not only has little impact on existing objects, but also can greatly reduce the intensity and scope of interference with social life on the ground. It is generally welcomed by people. However, this construction method is greatly affected by underground factors. When encountering sand and gravel formations such as collapse and rockfall, it is very easy to cause pipeline jamming and rupture, making it impossible for the pipe jacking construction to proceed smoothly. At present, the commonly used response method for formations prone to collapse is to implement jacking operations after grouting reinforcement, or to reselect the pipe jacking route to avoid formations prone to collapse. These treatment methods will inevitably lead to extended construction period and increased costs, especially when the pipe jacking construction has been jacked for a certain length and the pipe is stuck and cannot continue to be jacked. The loss caused by re-changing the pipe jacking route will be greater. Summary of the invention

[0003] In order to overcome the above-mentioned defects of the prior art, the present invention provides a steel pipe as an emergency alternative to a pipe jacking device and a pipe jacking construction method based on the steel pipe, so that the pipe jacking operation can be continued in some situations where conventional pipe jacking construction is obstructed.

[0004] The technical solution of the present invention is: a steel pipe for emergency replacement pipe jacking device, which is composed of one or more sections of steel pipe monomers (or single-section steel pipe), and the multiple sections of steel pipe monomers are connected in sequence along the axial direction. The steel pipe monomer is formed by two single-piece pipes (single-piece steel pipes) being matched together. The single-piece pipe (or the main part of the single-piece pipe) is in a semicircular tube shape (equivalent to cutting a circular pipe into two halves through its axis, and the shape of any half), both side edges (edges in the circumferential direction) are provided with straight folded edges (rectangular plane folded edges), and both end edges (edges in the axial direction) are provided with semicircular annular folded edges, and the straight folded edges that are matched (fitted) with each other in the two single-piece pipes (two single-piece pipes that are matched together to form the same steel pipe monomer) are fastened by fastening bolts, thereby realizing a fixed connection between the two single-piece pipes, and the semicircular annular folded edges that are matched with each other in the two steel pipe monomers (two steel pipe monomers connected to each other) are fastened by fastening bolts, thereby realizing a fixed connection between the two steel pipe monomers.

[0005] According to actual needs, sealing material (for example, conformable sealing gasket) may be provided between the mutually matched straight folded edges of two single-piece tubes (two single-piece tubes matched to form the same steel pipe unit), or no sealing material may be provided.

[0006] Any suitable existing technology can be used to realize the arrangement of the above-mentioned sealing material / sealing gasket. For example, a convex-concave structure for embedding / clamping the sealing material / sealing gasket can be arranged on the mating surface of the straight folded edge.

[0007] Preferably, the number of holes on the straight folding edge for setting fastening bolts is two and they are respectively located near the two ends of the straight folding edge.

[0008] The holes for setting fastening bolts on each straight folded edge are arranged in the same manner, that is, when any two single-piece tubes (in practice, single-piece tubes of the same specification) are matched with each other, the corresponding holes for setting fastening bolts on the two matched straight folded edges are aligned with each other.

[0009] According to actual needs, a sealing material (for example, a conformable sealing gasket) may be provided between the mutually matching semicircular annular folded edges of two steel pipe units (two steel pipe units connected to each other), or no sealing material may be provided.

[0010] The sealing material / sealing gasket may be arranged by any suitable existing technology. For example, a convex-concave structure for embedding / clamping the sealing material / sealing gasket may be arranged on the mating surface of the semicircular annular fold.

[0011] Preferably, the number of holes for setting fastening bolts on the semicircular annular fold is one and the hole is located in the middle (circumferential middle) of the semicircular annular fold.

[0012] The holes for setting the fastening bolts on each semicircular ring fold are arranged in the same manner, that is, when any two single-piece tubes (single-piece tubes of the same specification) are axially butted, the holes for setting the fastening bolts on the two semicircular ring folds that are matched together are aligned with each other.

[0013] Preferably, the folded edges (straight folded edges and semicircular folded edges) on the same single-piece tube are connected end to end, thereby forming a closed rib structure on the outer side of the single-piece tube (the straight folded edges and semicircular folded edges can both play a reinforcing role as ribs and can be used as ribs).

[0014] Optionally, the outer side of the monolithic tube is provided with or without an intermediate rib, and the intermediate rib is circumferentially located in the middle of the outer side of the monolithic tube, and the two ends (the two ends in the axial direction) are respectively connected to the semicircular annular folded edges of the corresponding ends to form an integral whole, so as to further improve the strength of the monolithic tube.

[0015] The heights (dimensions in the radial direction) of the straight flanges, the semicircular flanges and the intermediate ribs (if provided) are usually equal.

[0016] When an intermediate rib is provided, the holes for setting fastening bolts on the semicircular folding edge can be staggered with the intermediate rib and can be set on one side of the intermediate rib. After staggering, the positions of the holes for setting fastening bolts on the two semicircular folding edges at both ends of the monolithic tube should also be consistent, so that when the two monolithic tubes are axially butt-jointed, the holes for setting fastening bolts on the semicircular folding edges that fit each other between the two monolithic tubes are aligned with each other.

[0017] The monolithic tube can be made of steel plates, and the fixed connection method between the parts on the same monolithic tube can be integral pressure forming and welding.

[0018] A pipe jacking construction method based on steel pipes. During the pipe jacking construction, especially when the jacking of a working pipe is blocked, short-length excavation is performed in the forward direction according to the assembly requirements of the steel pipe monomer, and two single-piece pipes are delivered to (for example, transported to through the internal channel of the existing installed working pipe) the space excavated at the front end to be assembled into a single-section steel pipe (steel pipe monomer). In the case where there is an installed steel pipe at the rear side, the assembled single-section steel pipe is connected to the front end of the installed steel pipe. After one or more sections of the steel pipe are installed in this way, the front working pipe is pushed into the installed steel pipe, and the above process is continued until the working pipe is installed. The single-piece pipe is the single-piece pipe described in the steel pipe of the emergency replacement pipe jacking device disclosed in the present invention.

[0019] Furthermore, after the two monolithic pipes are delivered to the space excavated at the front end, the monolithic pipe located at the bottom after splicing is first set, and then the monolithic pipe located at the top is matched (fastened) to the monolithic pipe located at the bottom, so that the holes for setting fastening bolts on the mutually matched straight folded edges are aligned with each other, and the fastening bolts are passed through the mutually aligned holes for setting fastening bolts to fasten the corresponding straight folded edges together, thereby realizing the assembly of single-section steel spliced ​​pipes.

[0020] Preferably, in the process of setting the single-piece tube located below after splicing, filling is performed on the outer side of the single-piece tube located below according to actual needs to achieve positioning support for the single-piece tube located below and filling of the surrounding gaps. Furthermore, when there is a steel pipe that has been installed on the rear side, the two single-piece tubes in the assembled single-section steel pipe should be aligned with the two single-piece tubes on the steel pipe that has been installed on the rear side, respectively, so that the holes for setting fastening bolts on the semicircular annular folding edges that are matched with each other are aligned with each other, and the fastening bolts are passed through the aligned holes for setting fastening bolts, and the corresponding semicircular annular folding edges are fastened together, thereby realizing the connection of the spliced ​​single-section steel pipe at the front end of the installed steel pipe.

[0021] The beneficial effect of the present invention is that, when the working pipe cannot be directly pushed forward, the present invention can use manual excavation in the pipeline and install the steel pipe, and rely on the support of the steel pipe to continue to complete the subsequent construction of the pipe jacking work. Since the splicing of the steel pipe monomers only requires a short advance and a small range of excavation, and is supplemented by simple support means when necessary, it can effectively overcome the problems of the working pipe being stuck or broken due to poor geological conditions or long jacking distance, which hinder the pipe jacking construction, and avoid the losses caused by the inability to continue the construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of an underground pipeline (cross section) involved in the present invention; Figure 2 It is a schematic diagram of a monolithic tube (cross section) involved in the present invention; Figure 3 is a schematic diagram of a monolithic tube (side view) involved in the present invention; Figure 4 It is a schematic diagram of a steel pipe assembly (multiple sections, top view) involved in the present invention; Figure 5 It is a schematic diagram of a steel pipe assembly (multiple sections, side view) involved in the present invention; Figure 6 It is a schematic diagram of an underground pipeline (cross section) in another embodiment of the present invention. DETAILED DESCRIPTION

[0023] See also Figure 1-Figure 6 The single-section steel pipe 20 is composed of an upper single-piece pipe 21 and a lower single-piece pipe 22. The upper and lower single-piece pipes have the same structure and can use the same single-piece pipe.

[0024] The monolithic tube can usually be made of steel, and other suitable materials can also be used according to actual needs.

[0025] The main part of the monolithic tube can be regarded as a half piece cut out of a single section of steel tube along the axis, and folding edges are set on both side edges and both end edges. The folding edges set on both side edges are straight folding edges 24, which are used to connect two monolithic tubes in the same section of steel pipe, and the folding edges set on both end edges are semicircular folding edges 23, which are used for axial connection between adjacent single section steel pipes. At the same time, these folding edges also play the role of strengthening the ribs. Since the straight folding edges and the semicircular folding edges are connected end to end to form a closed (full circle) structure, stress concentration or weak links in anti-deformation are avoided, which is conducive to improving the overall strength of the monolithic tube.

[0026] If necessary, an intermediate rib 25 may be provided on the outer side of the monolithic tube. The intermediate rib is circumferentially located in the middle of the outer side of the monolithic tube, and its two ends (the two ends in the axial direction) are respectively connected to the semicircular annular folded edges of the corresponding ends to form an integral whole, so as to further improve the strength of the monolithic tube.

[0027] When an intermediate rib is provided, the holes for setting the fastening bolts on the semicircular folding edge can be staggered with the intermediate rib and set on one side of the intermediate rib. The positions of the holes for setting the fastening bolts on the two semicircular folding edges at both ends of the monolithic tube should correspond to each other, so that when the two monolithic tubes are axially butted, the holes for setting the fastening bolts on the semicircular folding edges that fit each other between the two monolithic tubes are aligned with each other.

[0028] For the convenience of on-site assembly, the number of holes 28 for setting fastening bolts on the semicircular fold is one and is located in the middle (circumferential middle) part of the semicircular fold; the number of holes for setting fastening bolts on the straight fold is two and are respectively located near the two ends of the straight fold.

[0029] The single-piece pipe can be welded and processed in the factory according to the design specifications and dimensions. For example, the inner diameter (the inner diameter of the steel pipe after splicing) is DN1000mm, the wall thickness is 3mm, the ribs (each folded edge and the middle rib, if any) are 50mm high, the processing length is 500mm per section, and the weight of each single-piece pipe is 25Kg.

[0030] After the two single-piece pipes are aligned up and down, the two sets of straight folded edges that are in contact with each other between the two single-piece pipes are fastened together by bolts 27 to form a single-section steel pipe (or steel pipe monomer).

[0031] A plurality of single-section steel pipes (steel pipe monomers) are axially connected in sequence to form a multi-section steel pipe with corresponding lengths.

[0032] During the assembly (connection) process of multi-section steel pipes, two single-piece pipes can be connected into a single-section steel pipe, and then the connected single-section steel pipe can be connected to the existing steel pipe (single section or multiple sections). Alternatively, a single-piece pipe can be connected to the corresponding position of the existing steel pipe (single section or multiple sections) first, and then another single-piece pipe can be connected.

[0033] The inner diameter of the single-piece pipe / single-section steel pipe is larger than the outer diameter of the working pipe (the pipe to be set up for pipe jacking construction, usually a reinforced concrete pipe, and can also be a pipe of other materials when appropriate) 10, and the length can be significantly smaller than the length of the working pipe unit to adapt to short-footage excavation.

[0034] In geological conditions prone to collapse, or when the already advanced pipe is long, it may be difficult / impossible to continue to advance the working pipe. When such a situation occurs, a steel pipe is used as the casing of the working pipe. With a short advance and small-scale excavation method, a forward hole (or channel) suitable for setting a single-section steel pipe is first opened (the forward direction of the working pipe that has been pushed in / the forward direction of the steel pipe that has been set, or the forward direction of the starting point). The single-section steel pipe is set in the forward hole and connected to the set steel pipe (if any) behind it. The single-section steel pipe is formed by matching two single-piece pipes. Since the size of the single-piece pipe is relatively small, it can be transported to the front end of the hole through the set working pipe. The steel pipe monomer is assembled in the opened front hole. The two single-piece pipes are matched up and down and connected into a single-section steel pipe by bolts. The assembled single-section steel pipe is connected to the existing steel pipe behind it (if there is a steel pipe behind it). However, when the first section of the steel pipe is set, there is no steel pipe behind it, and there is no connection with the steel pipe behind it. The steel pipe should be set in a position that allows the working pipe to be pushed into the steel pipe. Based on the convenience of operation and geological conditions, the working pipe can be pushed in after one section of steel pipe is set in the front direction, or after multiple sections of steel pipe are set in the front direction (for example, when the length of the front steel pipe reaches the length of a single section of working pipe). After assembling one or more sections of steel pipe in the front, push the working pipe into this / these steel pipes, and then continue to dig holes and set steel pipes in the front direction, thereby relying on the continuous extension of the steel pipes to continuously push in the working pipe until the laying of the working pipe is completed.

[0035] Usually, steel pipes are not required at the beginning of construction. After direct pipe jacking is blocked, steel pipes are installed at the front end of the working pipe that has been jacked. The subsequent operations of the pipe jacking construction can be continued with the help of steel pipes, so that the pipe jacking construction can be completed along the original route without changing or adjusting the route after being blocked. This greatly reduces the construction cost when direct pipe jacking is blocked, and the construction is convenient, the effect is good, and the construction period is guaranteed.

[0036] The present invention relates to a whole process of steel pipe splicing, which includes: single-piece pipe processing and manufacturing → single-piece pipe transportation to the construction site → single-piece pipe internal transportation → single-piece pipe positioning → bolt installation → foundation sand cushion layer laying → next stage cyclic construction.

[0037] The relevant operation methods are: 1) The single-piece pipe is transported to the construction site: The factory prepares the single-piece pipe according to the design specifications and transports the single-piece pipe in batches according to the construction progress. The loading and unloading should be directed by a dedicated person, and the pipe should be placed carefully during unloading to prevent damage and deformation of the assembled pipe, which will affect the subsequent installation.

[0038] Place wooden pads on the bottom of the transport vehicle and wooden blocks between each single-piece pipe to prevent the single-piece pipe from being damaged by strong collisions during transportation. Pay special attention to the protection of the ribs.

[0039] 2) Transporting the single-piece pipe in the pipe: Use an excavation trolley to transport the single-piece pipe along the set working pipeline to the front end. When the excavation at the front end meets the installation requirements, the excavation trolley can transport two single-piece pipes at a time.

[0040] When transporting in pipes, tie them to the trolley with straw ropes to avoid collision with surrounding pipes or falling off.

[0041] 3) Single-section pipe splicing: The steel pipe is connected to the working pipe by inner diameter butt joint. The steel pipe is assembled from bottom to top. The lower single-piece pipe is installed first. The area within 120° on the outside of the lower single-piece pipe is backfilled with medium-coarse sand, and then the upper single-piece pipe is installed. During the installation process, the position of the bolt holes between the upper and lower single-piece pipes should be adjusted at any time to ensure that the holes are centered and the bolts are installed.

[0042] 4) Front and rear connection: The two sections of steel pipes are connected with M12 bolts. Insert the bolts through the upper and lower screw holes and tighten them.

[0043] Usually, the mating surface 29 of the two monolithic tubes on the same steel pipe unit can be generally horizontal. When appropriate, it is preferred that the mating surface of the two monolithic tubes on the same steel pipe unit has an angle β relative to the horizontal plane, and the angle can be 0-45° (0≦β≦45°, when it is horizontal, it can be regarded as β=0), for example, 10°, 20° or 30°, to facilitate the bolt tightening operation.

[0044] The area within 120° outside the lower single-piece tube is backfilled with medium-coarse sand, and sandblasting is used to fill the space between the steel pipe and the working pipe to ensure that the space between the steel pipe and the working pipe is densely filled.

[0045] After the monolithic tube is in place, the hole alignment should be confirmed again before the bolts are installed to ensure that the holes of the upper and lower tubes are aligned. Each monolithic tube has 5 round bolt holes, 2 on each side and 1 on the top. After the hole positions are confirmed to be correct, install the M12 bolts. The bolt penetration direction should be consistent. First install the fastening bolts between the edge ribs (straight folded edges), then install the fastening bolts between the middle ribs (semi-circular folded edges). After installation, tighten with a bolt tightening wrench.

[0046] Once in place, sandblasting may be used to fill the gap 30 between the casing and the working tube.

[0047] The underground pipeline installed by the construction method of the present invention mainly consists of a working pipe and a casing, wherein the working pipe is formed by connecting multiple sections of working pipe monomers (usually reinforced concrete pipe monomers) 10 by a socket connection method, and the casing is a steel pipe of any emergency alternative jacking device disclosed in the present invention, which is sleeved on the outside of the working pipe.

[0048] Because under normal circumstances, at the beginning of construction, a conventional jacking method may be used to set a working pipe at a distance. Only when the direct jacking operation of the working pipe is blocked, it is necessary to set a steel pipe. Therefore, the casing composed of steel pipes is usually only located at the front of the working pipe, and the outer side of the rear part of the working pipe (the specific length depends on the actual situation) is not provided with a casing. Therefore, the casing and the rear part of the working pipe are set in the underground medium, and the front part of the working pipe is set in the casing.

[0049] Unless otherwise specified or when one preferred or optional technical means is a further limitation of another technical means, the preferred and optional technical means disclosed in the present invention can be arbitrarily combined to form several different specific implementation methods.

Claims

1. A steel pipe assembly for emergency replacement pipe jacking device, which is composed of one or more sections of steel pipe assembly monomers, and the multiple sections of steel pipe assembly monomers are connected in sequence along the axial direction, characterized in that The steel pipe monomer is formed by two single-piece pipes being matched together. The single-piece pipe is in a semicircular tube shape, with straight folded edges on both side edges and semicircular annular folded edges on both end edges. The straight folded edges matched together in the two single-piece pipes are fastened by fastening bolts, and the semicircular annular folded edges matched together in the two steel pipe monomers are fastened by fastening bolts.

2. The steel pipe as claimed in claim 1, characterized in that Sealing material may or may not be provided between the mutually facing straight folded edges of the two single-piece tubes.

3. The steel pipe as claimed in claim 1, characterized in that The number of holes for setting fastening bolts on the straight folding edge is two and they are respectively located near the two ends of the straight folding edge.

4. The steel pipe as claimed in claim 1, characterized in that Sealing material may or may not be provided between mutually facing semicircular annular folded edges of two steel pipe units.

5. The steel pipe as claimed in claim 1, characterized in that The number of holes for setting fastening bolts on the semicircular ring fold is one and the hole is located in the middle of the semicircular ring fold.

6. The steel pipe as claimed in claim 1, characterized in that The folded edges on the same single tube are connected end to end.

7. The steel pipe as claimed in claim 1, characterized in that The single-piece tube is made of steel plate.

8. A pipe jacking construction method based on steel pipe splicing, characterized in that During the pipe jacking construction, according to the assembly requirements of the steel pipe monomer, short advance excavation is carried out in the forward direction, and two single-piece pipes are sent to the space excavated at the front end and assembled into a single-section steel pipe. When there is an installed steel pipe at the rear side, the assembled single-section steel pipe is connected to the front end of the installed steel pipe. After one or more sections of steel pipes are installed in this way, the front working pipe is pushed into the installed steel pipe, and the above process is continued until the working pipe is set. The single-piece pipe is a single-piece pipe in the steel pipe of the emergency replacement pipe jacking device described in any one of claims 1-7.

9. The pipe jacking construction method according to claim 8, characterized in that After delivering the two monolithic tubes to the space excavated at the front end, first set the monolithic tube located at the bottom after splicing, and then match the monolithic tube located at the top to the monolithic tube located at the bottom, so that the holes for setting fastening bolts on the mutually matched straight folded edges are aligned with each other, and the fastening bolts are passed through the aligned holes for setting fastening bolts to fasten the corresponding straight folded edges together.

10. The pipe jacking construction method according to claim 9, characterized in that When there is a steel pipe installed in place on the rear side, the two single-piece tubes in the assembled single-section steel pipe should be aligned with the two single-piece tubes on the steel pipe installed in place on the rear side, respectively, so that the holes for setting fastening bolts on the semicircular annular folding edges that are opposite to each other are aligned with each other, and the fastening bolts are passed through the aligned holes for setting fastening bolts to fasten the corresponding semicircular annular folding edges together.

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