Pipe laying and installation method for the closure section of large-diameter PCCP water pipelines

Abstract

The present application relates to a method for installing the closing section of a large-diameter PCCP water pipeline, and particularly to a method for arranging and installing the closing section of a large-diameter PCCP water pipeline; it includes a closing opening, a front pipeline, a rear pipeline, a front track, a rear track, and an access road. Both the front pipeline and the rear pipeline are straight pipelines. The front pipeline and the rear pipeline are arranged at an angle, and there is a gap at the intersection of the front pipeline and the rear pipeline to form a closing opening. By implementing the above technical solution, in the present application, the inflection point of the pipeline is selected as the closing opening, and at the port of the front track, an extended or deflected method is adopted to form a deflected track that bypasses the port of the rear pipeline. With the cooperation of the access road and the descending slope, the pipe transport vehicle can be backed into the descending slope, and the gantry crane can unload the pipes to install the complete front pipeline; since the closing pipes are fabricated in sections, only a small-tonnage truck crane is needed to complete the closing installation during closing, saving construction costs.

Description

Technical Field

[0001] The present application relates to a method for installing a closing section of a large-diameter PCCP water pipeline, and more particularly to a closing section structure and pipe laying installation method of a large-diameter PCCP water pipeline. Background Art

[0002] In order to improve the installation progress of large-diameter PCCP water pipeline projects, the same pipeline is usually installed simultaneously on multiple working faces, and closing pipes (steel pipe fittings) are set at the connection between adjacent working faces. When a gantry is used for installation, the number of PCCPs installed at the closing point is limited due to the height, width and length of the gantry. As a result, it is necessary to rent a large-tonnage crane separately to install PCCP and close the steel pipe fittings during closing.

[0003] A large-diameter PCCP weighs about 50 tons per section (taking DN3400 as an example). Due to the geographical environment of the installation working surface, when using a crawler crane for installation, considering safety, at least 280 tons are required, the rental fee is about 300,000 yuan / month, and the site fee is about 100,000 yuan / time, which is quite expensive. In order to save costs, a gantry is usually used for installation.

[0004] The pipeline closing section is usually a straight section. Due to the position of the gantry during installation, a large length is reserved at the closing point, which makes it impossible to install 2 to 3 sections of PCCP according to the pipe layout table. As a result, a large-tonnage crane needs to be rented separately during closing, which increases the construction cost. Summary of the invention

[0005] The purpose of this application is to propose a large-diameter PCCP water pipeline closing section structure and pipe laying and installation method that reduces construction costs.

[0006] One of the technical solutions of the present application is achieved as follows: a large-diameter PCCP water pipeline closing section structure, which includes a closing mouth, a front pipeline, a rear pipeline, a front track, a rear track and an accompanying road; the front pipeline and the rear pipeline are both straight pipelines, the front pipeline and the rear pipeline are arranged at an angle and a gap is left at the intersection of the front pipeline and the rear pipeline to form a closing mouth; the front track is distributed on both sides of the front pipeline along the axis of the front pipeline, and the rear track is distributed on both sides of the rear pipeline along the axis of the rear pipeline; an accompanying road corresponding to the rear pipeline is provided on the back side of the bending angle formed by the front pipeline and the rear pipeline; the front track is located at one end of the closing mouth and is connected to a deflection track that is offset to one side of the accompanying road and can bypass the rear end pipeline port; the accompanying road is connected to a descending slope that can reduce the height and connect to the deflection track.

[0007] Furthermore, the bending angle formed by the front-end pipeline and the rear-end pipeline is 177 degrees to 100 degrees.

[0008] Further, when the bending angle formed by the front pipeline and the rear pipeline is less than or equal to 140 degrees, the deflection track is an integral type, and the deflection track is connected to the front track and arranged at an angle.

[0009] Further, when the bending angle formed by the front pipeline and the rear pipeline is greater than 140 degrees, the deflection track is a segmented type, and adjacent segments of the deflection track are arranged at an angle.

[0010] Further, the accompanying pipeline is parallel to the rear pipeline. The front pipeline includes multiple sections of butt-connected PCCP pipes, and the distance between the accompanying pipeline and the rear pipeline is not less than twice the length of one section of PCCP pipe.

[0011] Further, it also includes a closing pipe. The closing pipe includes an elbow and an extension straight pipe. The elbow includes a left straight pipe, a left butt pipe, a right butt pipe, and a right straight pipe; the inner diameters of the left straight pipe, the left butt pipe, the right butt pipe, and the right straight pipe are all the same, and the outer diameters of the left straight pipe, the left butt pipe, the right butt pipe, and the right straight pipe are all the same; the cross-section of the left butt pipe along the central plane is a right trapezoid, and the port of the left butt pipe corresponding to the right-angled waist of the right trapezoid is fixedly connected to the left straight pipe by circumferential welding; the structure of the right butt pipe is symmetric to the left butt pipe in left and right, and the port of the left butt pipe corresponding to the oblique waist of the right trapezoid is spot-welded to the port of the right butt pipe corresponding to the oblique waist of the right trapezoid.

[0012] The second technical solution of this application is implemented as follows: A pipe laying and installation method for the closure section of a large-diameter PCCP water transmission pipeline. The closure section of the large-diameter PCCP water transmission pipeline includes a closure opening, a front pipeline, a rear pipeline, a front track, a rear track, and an access road; both the front pipeline and the rear pipeline are straight pipelines, the front pipeline and the rear pipeline are arranged at an angle, and there is a gap at the intersection of the front pipeline and the rear pipeline to form a closure opening; the front track is distributed on both sides of the front pipeline along the axis of the front pipeline, and the rear track is distributed on both sides of the rear pipeline along the axis of the rear pipeline; an access road corresponding to the rear pipeline is provided on the back of the bending angle formed by the front pipeline and the rear pipeline; the front track is connected to one end of the closure opening and is offset to the side of the access road and can bypass the port of the rear pipeline to form a deflection track; the access road is connected to a downhill slope that can lower the height and connect to the deflection track; The method includes the following steps: The first step: Select the position of the closure pipe in the pipeline, and use the pipeline inflection point as the closure section; The second step: Reserve a closure opening for installing the closure pipe; The third step: Lay the front track forward along the reserved closure opening and lay the rear track backward; The fourth step: Erect a gantry through the rear track, and sequentially install PCCP pipes in the direction towards or away from the closure opening to form the rear pipeline; The fifth step: Erect a gantry through the front track, and sequentially install PCCP pipes in the direction towards the reserved closure opening, and reserve the last one or two PCCP pipe sections; The sixth step: At the closure opening, extend and offset the front track so that the formed deflection track bypasses the port of the rear pipeline; The seventh step: On the back of one side of the bending angle formed by the front pipeline and the rear pipeline, build an access road corresponding to the rear pipeline, and then build a downhill slope connecting the access road and the deflection track; The pipe transport vehicle enters the deflection track by driving into the downhill slope through the access road, and the gantry unloads the pipe and installs the last reserved one or two PCCP pipes to form the front pipeline; The eighth step: Use a truck crane to install the closure pipe at the closure opening for closure.

[0013] Further, when the bending angle formed by the front pipeline and the rear pipeline is greater than 100 degrees and less than or equal to 140 degrees, the deflection track is of an integral type, and the deflection track is connected to the front track and is arranged at an angle.

[0014] Further, when the bending angle formed by the front pipeline and the rear pipeline is greater than 140 degrees and less than 177 degrees, the deflection track is of a segmented type, and adjacent segments of the deflection track are arranged at an angle.

[0015] Due to the implementation of the above technical solution, in this application, by selecting the inflection point of the pipeline as the closure opening, and taking the method of extending or deflecting at the port of the front track to form a deflection track that bypasses the port of the rear pipeline, and cooperating with the access road and the downhill slope, the pipe transport vehicle can drive into the downhill slope, and the gantry unloads the pipe to install the complete front pipeline; because the closure pipe is made in sections, only a small-tonnage truck crane is needed to complete the closure installation during closure, saving construction costs. Description of the Drawings

[0016] The specific structure of this application is given by the following drawings and embodiments:

[0017] Figure 1 It is a schematic diagram of the structure of this application;

[0018] Figure 2 It is a schematic diagram of the structure of the curved pipe part in the closed pipe in this application.

[0019] Legend: 1. Left straight pipe, 2. Left butt-joined pipe, 3. Right butt-joined pipe, 4. Right straight pipe, 5. Closing mouth, 6. Front pipeline, 7. Rear pipeline, 8. Front track, 9. Rear track, 10. Accompanying road, 11. Deflection track, 12. Descending slope, 13. Lengthening straight pipe, A. Bending angle formed by the front pipeline and the rear pipeline. DETAILED DESCRIPTION

[0020] The present application is not limited to the following embodiments, and the specific implementation method can be determined according to the technical solution of the present application and actual conditions.

[0021] Embodiment 1, as Figures 1 to 2 As shown, the closing section structure of the large-diameter PCCP water pipeline includes a closing opening 5, a front pipeline 6, a rear pipeline 7, a front track 8, a rear track 9 and an accompanying road 10; the front pipeline 6 and the rear pipeline 7 are both straight pipelines, the front pipeline 6 and the rear pipeline 7 are arranged at an angle, and a gap is left at the intersection of the front pipeline 6 and the rear pipeline 7 to form a closing opening 5; the front track 8 is distributed on both sides of the front pipeline 6 along the axis of the front pipeline 6, and the rear track 9 is distributed on both sides of the rear pipeline 7 along the axis of the rear pipeline 7; an accompanying road 10 corresponding to the rear pipeline 7 is provided on the back side of the bending angle A formed by the front pipeline and the rear pipeline; the front track 8 is located at one end of the closing opening 5 and is connected to a deflection track 11 that is offset to one side of the accompanying road 10 and can bypass the port of the rear pipeline 7; the accompanying road 10 is connected to a descending slope 12 that can reduce the height and connect to the deflection track 11.

[0022] The present application selects the turning point of the pipeline as the closing mouth 5, first sets up a gantry through the rear end track 9, and installs the complete rear end pipeline 7 normally through the gantry; sets up the gantry through the front end track 8, and installs the PCCP pipes in sequence toward the reserved closing mouth 5 until the last one or two PCCP pipe sections. At this time, due to the angle limitation, the pipe transport vehicle installed with the PCCP pipe cannot enter the track, and the front end track 8 is extended and offset to form a deflection track 11 that can bypass the port of the rear end pipeline 7; the pipe transport vehicle pours into the descending slope 12 through the accompanying road 10 and enters the middle of the deflection track 11, and the gantry unloads the pipes and installs the last one or two reserved PCCP pipe sections to form a complete front end pipeline 6.

[0023] Since the closing pipe weighs about 10 tons and is fabricated in sections, only a small-tonnage truck crane is required to complete the closing and installation finally, which saves the construction cost.

[0024] As Figure 1 shown, the bending angle A formed by the front pipeline and the rear pipeline refers to the angle of bending assuming that the front pipeline 6 and the rear pipeline 7 are respectively extended and connected, that is, the bending angle of the closing pipe.

[0025] As Figure 1 shown, the bending angle A formed by the front pipeline and the rear pipeline is from 177 degrees to 100 degrees.

[0026] As Figure 1 shown, when the bending angle A formed by the front pipeline and the rear pipeline is less than or equal to 140 degrees, the deflection track 11 is of an integral type, and the deflection track 11 is connected to the front track 8 and arranged at an angle.

[0027] At this time, the front pipeline 6 and the rear pipeline 7 are bent greatly, and there is more space to facilitate the deflection track 11 to give way to the rear pipeline 7; only the angle needs to be adjusted when the deflection track 11 is butt-connected to the front track 8.

[0028] As Figure 1 shown, when the bending angle A formed by the front pipeline and the rear pipeline is greater than 140 degrees, the deflection track 11 is of a segmented type, and adjacent segments of the deflection track 11 are arranged at an angle.

[0029] At this time, the front pipeline 6 and the rear pipeline 7 are bent slightly, and there is no space to facilitate the deflection track 11 to give way to the rear pipeline 7; the deflection track 11 needs to be adjusted at a large angle and offset; in order to prevent the gantry from not advancing smoothly on the track, the deflection track 11 is fabricated in segments, and the length of each segment is 1 to 2 meters. In this way, through the structural method of multi-segment adjustment and small-angle adjustment for each segment, it is conducive to the stable and safe advancement of the gantry.

[0030] As Figure 1 shown, the access road 10 is distributed in parallel with the rear pipeline 7. The front pipeline 6 includes multiple sections of butt-connected PCCP pipes. The distance between the access road 10 and the rear pipeline 7 is not less than twice the length of one section of PCCP pipe.

[0031] It is conducive to the pipe transport vehicle to reverse into the descending slope 12 and enter the deflection track 11. The access road 10 can also continue to extend along the direction of the front pipeline, facilitating the travel of the pipe transport vehicle.

[0032] As Figure 2As shown in the figure, it further includes a closing pipe, and the closing pipe includes an elbow and an extension straight pipe 13. The elbow includes a left straight pipe 1, a left docking pipe 2, a right docking pipe 3, and a right straight pipe 4 that are connected in sequence. The inner diameters of the left straight pipe 1, the left docking pipe 2, the right docking pipe 3, and the right straight pipe 4 are all the same, and the outer diameters of the left straight pipe 1, the left docking pipe 2, the right docking pipe 3, and the right straight pipe 4 are all the same. The cross-section of the left docking pipe 2 along the central plane is a right trapezoid, and the port of the left docking pipe 2 corresponding to the right-angled waist of the right trapezoid is fixedly connected to the left straight pipe 1 by circumferential welding. The structure of the right docking pipe 3 is symmetric to the left and right of the structure of the left docking pipe 2, and the port of the left docking pipe 2 corresponding to the oblique waist of the right trapezoid is spot-welded to the port of the right docking pipe 3 corresponding to the oblique waist of the right trapezoid.

[0033] The cross-section of the left docking pipe 22 along the central plane is a right trapezoid, which can ensure that the axes of the left straight pipe 11 and the left docking pipe 22 coincide. The structure of the right docking pipe 33 is symmetric to the left and right of the structure of the left docking pipe 22, which can ensure that the axes of the right straight pipe 43 and the right docking pipe 34 coincide. Therefore, the included angle between the axis of the left docking pipe 22 and the axis of the right docking pipe 33 is the angle of the elbow to be measured. The spot welding connection between the left docking pipe 22 and the right docking pipe 33 can realize the early prediction and effective control of the angle during the manufacturing process of the angled pipe fittings, avoiding angle deviation and material loss. The extension straight pipe 13 is measured, cut on-site according to the actual length, and finally welded.

[0034] Embodiment 2, a method for laying and installing the closing section of a large-diameter PCCP water pipeline, includes the first step: select the position of the closing pipe in the pipeline, and use the inflection point of the pipeline as the closing section; the second step: reserve a closing opening 5 for installing the closing pipe; the third step: lay a front track 8 forward along the reserved closing opening 5 and lay a rear track 9 backward; the fourth step: erect a gantry through the rear track 9, and sequentially install PCCP pipes in the direction towards or away from the closing opening 5 to form a rear pipeline 7; the fifth step: erect a gantry through the front track 8, and sequentially install PCCP pipes in the direction towards the reserved closing opening 5, and reserve the last one or two PCCP pipe sections; the sixth step: at the closing opening 5, extend and offset the front track 8 so that the formed deflection track 11 bypasses the port of the rear pipeline 7; the seventh step: on the back of one side of the bending angle A formed by the front pipeline and the rear pipeline, build an access road 10 corresponding to the rear pipeline 7, and then build a descending slope 12 connecting the access road 10 and the deflection track 11. The pipe transport vehicle enters the deflection track 11 by driving into the descending slope 12 through the access road 10, and the gantry unloads the pipe and installs the last reserved one or two PCCP pipes to form a front pipeline 6; the eighth step: use a truck crane to install the closing pipe at the closing opening 5 for closing.

[0035] The method of the present application can successfully install the PCCP required for the pipe string, only leaving the closing position for the steel pipe fittings. When closing, a small-tonnage truck crane can be hired to achieve the closing of the pipeline, saving construction costs; it is applicable to the installation and closing of pipes of other materials and specifications, with a wide range of applications, and can be further promoted and applied.

[0036] As Figures 1 to 2 shown, when the bending angle A formed by the front pipeline and the rear pipeline is greater than 100 degrees and less than or equal to 140 degrees, the deflection track 11 is a whole-section type, and the deflection track 11 is connected to the front track 8 and arranged at an angle.

[0037] As Figures 1 to 2 shown, when the bending angle A formed by the front pipeline and the rear pipeline is greater than 140 degrees and less than 177 degrees, the deflection track 11 is a segmented type, and the adjacent segments of the deflection track 11 are arranged at an angle.

[0038] In this article, "up", "down", "front", "back", "left", "right", etc. are only used to represent the relative position relationship between relevant parts, rather than limiting the absolute positions of these relevant parts.

[0039] The above technical features constitute the embodiments of the present application, which have strong adaptability and implementation effects. Non-essential technical features can be added or reduced according to actual needs to meet the needs of different situations.

Claims

1. A method for laying and installing a large-diameter PCCP water pipeline closure section, characterized in that: The large-diameter PCCP water transmission pipeline closing section includes a closing opening, a front pipeline, a rear pipeline, a front track, a rear track, and an access road; both the front pipeline and the rear pipeline are straight pipelines, the front pipeline and the rear pipeline are arranged at an angle, and there is a gap at the intersection of the front pipeline and the rear pipeline to form a closing opening; the front track is distributed on both sides of the front pipeline along the axis of the front pipeline, and the rear track is distributed on both sides of the rear pipeline along the axis of the rear pipeline; an access road corresponding to the rear pipeline is provided on the back of the bending angle formed by the front pipeline and the rear pipeline; at one end of the closing opening, the front track is connected with a deflection track that deflects towards the access road side and can bypass the port of the rear pipeline; the access road is connected with a downhill slope that can lower the height and connect to the deflection track; it includes the following steps: Step 1: Select the position of the closing pipe in the pipeline, and take the pipeline inflection point as the closing section; Step 2: Reserve a closing opening for installing the closing pipe; Step 3: Lay the front track forward along the reserved closing opening and lay the rear track backward; Step 4: Erect a gantry through the rear track, and sequentially install PCCP pipes towards or away from the closing opening direction to form the rear pipeline; Step 5: Erect a gantry through the front track, and sequentially install PCCP pipes towards the reserved closing opening direction, and reserve the last one or two PCCP pipe sections; Step 6: At the closing opening, extend and deflect the front track so that the formed deflection track bypasses the port of the rear pipeline; Step 7: On the back of one side of the bending angle formed by the front pipeline and the rear pipeline, build an access road corresponding to the rear pipeline, and then build a downhill slope connecting the access road and the deflection track; the pipe transport vehicle enters the deflection track through the access road and into the downhill slope, and the gantry unloads the pipe and installs the last reserved one or two PCCP pipes to form the front pipeline; Step 8: Use a truck crane to install the closing pipe at the closing opening for closing; 2. The pipe laying and installation method for the closure section of a large-diameter PCCP water transmission pipeline according to claim 1, wherein: When the bending angle formed by the front pipeline and the rear pipeline is greater than 100 degrees and less than or equal to 140 degrees, the deflection track is a whole-section type, and the deflection track is connected to the front track and arranged at an angle; 3. The pipe laying and installation method for the closure section of the large-diameter PCCP water transmission pipeline according to claim 1, characterized in that: When the bending angle formed by the front pipeline and the rear pipeline is greater than 140 degrees and less than 177 degrees, the deflection track is a segmented type, and the adjacent segments of the deflection track are arranged at an angle; 4. The installation method of the large-diameter PCCP water conveyance pipeline closing section according to claim 1 or 2 or 3, characterized in that: The access road is parallel to the rear pipeline, the front pipeline includes multiple PCCP pipes connected in butt joints, and the distance between the access road and the rear pipeline is not less than twice the length of one PCCP pipe section.

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