CN112984214A - Large-diameter PCCP (prestressed concrete cylinder pipe) water pipeline closure section framework and pipe distribution installation method - Google Patents

Large-diameter PCCP (prestressed concrete cylinder pipe) water pipeline closure section framework and pipe distribution installation method Download PDF

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CN112984214A
CN112984214A CN202110163128.XA CN202110163128A CN112984214A CN 112984214 A CN112984214 A CN 112984214A CN 202110163128 A CN202110163128 A CN 202110163128A CN 112984214 A CN112984214 A CN 112984214A
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pipeline
pipe
end pipeline
closing
track
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李建生
侯方
王淼
车刚
徐永军
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Xinjiang Guo Tong Pipeline Co ltd
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Xinjiang Guo Tong Pipeline Co ltd
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Priority to CN202110163128.XA priority Critical patent/CN112984214A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
    • F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
    • F16L1/028—Laying or reclaiming pipes on land, e.g. above the ground in the ground
    • F16L1/036—Laying or reclaiming pipes on land, e.g. above the ground in the ground the pipes being composed of sections of short length
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
    • F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
    • F16L1/06—Accessories therefor, e.g. anchors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
    • F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
    • F16L1/06—Accessories therefor, e.g. anchors
    • F16L1/09—Accessories therefor, e.g. anchors for bringing two tubular members closer to each other

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sewage (AREA)

Abstract

本申请涉及一种大口径PCCP输水管线合拢段安装构造及安装方法，尤其涉及一种大口径PCCP输水管线合拢段架构及布管安装方法；其包括依合拢口、前端管线、后端管线、前端轨道、后端轨道和伴行路；前端管线与后端管线均为直线管线，前端管线与后端管线呈夹角布置且前端管线与后端管线在交汇处留有缺口从而形成合拢口。由于实施上述技术方案，本申请通过选择管线的拐点处为合拢口，在前端轨道端口采取延长或偏转的办法形成绕过后端管线端口的偏转轨道，配合伴行路及下降坡，运管车可倒入下降坡，龙门架卸管安装完整的前端管线；因合拢管分节制作，合拢时只需小吨位汽车吊便能完成合拢安装，节省了施工成本。

Figure 202110163128

The present application relates to an installation structure and an installation method for a closed section of a large-diameter PCCP water transmission pipeline, in particular to a closed section structure and a pipe layout installation method of a large-diameter PCCP water transmission pipeline; , Front-end track, back-end track and accompanying road; the front-end pipeline and the back-end pipeline are straight pipelines, the front-end pipeline and the back-end pipeline are arranged at an angle, and the front-end pipeline and the back-end pipeline leave a gap at the intersection to form a closing port. Due to the implementation of the above technical solutions, the present application selects the inflection point of the pipeline as the closing port, and adopts the method of extending or deflecting the front-end track port to form a deflection track that bypasses the rear-end pipeline port. With the accompanying road and descending slope, the pipe transport vehicle can be reversed. When entering the descending slope, the gantry is unloaded to install the complete front-end pipeline; because the closing pipe is made in sections, only a small tonnage truck crane can complete the closing and installation when closing, which saves the construction cost.

Figure 202110163128

Description

Large-diameter PCCP (prestressed concrete cylinder pipe) water pipeline closure section framework and pipe distribution installation method
Technical Field
The application relates to a large-diameter PCCP water conveying pipeline closure section installation structure and an installation method, in particular to a large-diameter PCCP water conveying pipeline closure section framework and a pipe distribution installation method.
Background
In order to improve the engineering installation progress of the large-diameter PCCP water conveying pipeline, the same pipeline is usually installed by adopting a plurality of working faces at the same time, a closure pipe (steel pipe fitting) is arranged at the joint of the adjacent working faces, when the portal frame is adopted for installation, the height, the width and the length of the closure part of the portal frame are influenced, the number of the PCCPs installed at the tube distribution of the closure part is limited, and a large-tonnage crane is required to be rented for PCCP installation and steel pipe fitting closure during closure.
The large-caliber PCCP is single-section and weighs about 50 tons (taking DN3400 as an example), is influenced by the geographical environment of an installation working face, and when the large-caliber PCCP is installed by adopting the crawler crane, the safety is considered, at least more than 280 tons are needed, the rent is about 30 ten thousand per month, the entrance fee is about 10 ten thousand per time, and the cost is higher. In order to save costs, a gantry is usually used for installation.
The pipeline closure section is usually selected from straight line sections, the portal frame is influenced by the position during installation, the reserved length of the closure part is large, so that 2-3 sections of PCCPs cannot be installed in a pipe arrangement mode according to a pipe arrangement meter, a large-tonnage crane needs to be rented independently during closure, and the construction cost is increased.
Disclosure of Invention
The application aims to provide a large-caliber PCCP water conveying pipeline closure section framework capable of reducing construction cost and a pipe distribution installation method.
One of the technical solutions of the present application is implemented as follows: the large-caliber PCCP water conveying pipeline closure section framework comprises a closure opening, a front end pipeline, a rear end pipeline, a front end rail, a rear end rail and an accompanying road; the front end pipeline and the rear end pipeline are both linear pipelines, the front end pipeline and the rear end pipeline are arranged in an included angle, and a gap is reserved at the junction of the front end pipeline and the rear end pipeline so as to form a folding port; the front end tracks are distributed on two sides of the front end pipeline along the axis of the front end pipeline, and the rear end tracks are distributed on two sides of the rear end pipeline along the axis of the rear end pipeline; the back of a bending angle formed by the front end pipeline and the rear end pipeline is provided with an accompanying road corresponding to the rear end pipeline; one end of the front end track, which is positioned at the folding port, is connected with a deflection track which deflects to one side of the accompanying road and can bypass the pipeline port at the rear end; the accompanying road is connected with a descending slope which can descend the height and is connected to the deflecting track.
Furthermore, the bending angle formed by the front end pipeline and the rear end pipeline is 177-100 degrees.
Furthermore, when the bending angle formed by the front end pipeline and the rear end pipeline is less than or equal to 140 degrees, the deflection track is in a whole-segment type, and the deflection track is connected with the front end track and arranged in an included angle mode.
Furthermore, when the bending angle formed by the front end pipeline and the rear end pipeline is larger than 140 degrees, the deflection tracks are in a sectional type, and the deflection tracks of adjacent sections are arranged in an included angle.
Furthermore, the accompanying path and the rear end pipeline are distributed in parallel, the front end pipeline comprises a plurality of sections of PCCP pipes which are connected in a butt joint mode, and the distance between the accompanying path and the rear end pipeline is not less than twice the length of one section of PCCP pipe.
The folding pipe comprises an elbow and a length-adjusting straight pipe, wherein the elbow comprises a left straight pipe, a left butt joint pipe, a right butt joint pipe and a right straight pipe; the inner diameters of the left straight pipe, the left butt joint pipe, the right butt joint pipe and the right straight pipe are all consistent, and the outer diameters of the left straight pipe, the left butt joint pipe, the right butt joint pipe and the right straight pipe are all consistent; the section of the left butt joint pipe along the central plane is in a right trapezoid shape, and the port of the left butt joint pipe corresponding to the right-angled waist of the right trapezoid shape is fixedly connected with the left straight pipe through girth welding; the structure of the right butt joint pipe is bilaterally symmetrical to that of the left butt joint pipe, and the port of the left butt joint pipe corresponding to the oblique waist of the right trapezoid is connected with the port of the right butt joint pipe corresponding to the oblique waist of the right trapezoid in a spot welding manner.
The second technical scheme of the application is realized as follows: the large-caliber PCCP water conveying pipeline folding section pipe distribution installation method comprises the following steps: the first step is as follows: selecting the position of a folded pipe in the pipeline, and taking the inflection point of the pipeline as a folded section; the second step is that: reserving a folding opening for installing a folding pipe; the third step: paving a front end track forwards along the reserved folding opening, and paving a rear end track backwards; the fourth step: erecting a portal frame through a rear-end rail, and sequentially installing PCCP pipes towards or away from the direction of the closure opening to form a rear-end pipeline; the fifth step: erecting a portal frame through a front end rail, sequentially installing PCCP pipes towards the direction of a reserved folding opening, and reserving the last to two sections of PCCP pipe joints; and a sixth step: at the closure, the front end track is lengthened and deviated, so that the formed deflection track bypasses the rear end pipeline port; the seventh step: building an accompanying road corresponding to the rear-end pipeline on the back of one side of a bending angle formed by the front-end pipeline and the rear-end pipeline, and then building a descending slope connecting the accompanying road and the deflection track; the pipe transporting vehicle is poured into a descending slope through a accompanying road so as to enter a deflection track, and one to two sections of PCCP pipes reserved finally are installed on the gantry unloading pipe to form a front-end pipeline; eighth step: and (5) installing the folding pipe at the folding opening by using a truck crane for folding.
Furthermore, when the bending angle formed by the front end pipeline and the rear end pipeline is larger than 100 degrees and smaller than or equal to 140 degrees, the deflection track is in a whole-segment type, and the deflection track is connected with the front end track and arranged in an included angle mode.
Furthermore, when the bending angle formed by the front end pipeline and the rear end pipeline is larger than 140 degrees and smaller than 177 degrees, the deflection tracks are in a sectional type, and the deflection tracks of adjacent sections are arranged in an included angle.
Due to the implementation of the technical scheme, the turning point of the pipeline is selected to be the folding port, the deflection track bypassing the port of the rear-end pipeline is formed at the port of the front-end track by adopting an extension or deflection method, the accompanying road and the descending slope are matched, the pipe carrier can be poured into the descending slope, and the portal frame is unloaded to install the complete front-end pipeline; because the folding pipe is manufactured in sections, the folding installation can be completed only by a small-tonnage truck crane during folding, and the construction cost is saved.
Drawings
The specific structure of the application is given by the following figures and examples:
FIG. 1 is a schematic structural diagram of the present application;
fig. 2 is a schematic view of the structure of a bent pipe portion in a folded pipe according to the present application.
Legend: 1. the device comprises a left straight pipe, 2 a left butt joint pipe, 3 a right butt joint pipe, 4 a right straight pipe, 5 a folding port, 6 a front end pipeline, 7 a rear end pipeline, 8 a front end rail, 9 a rear end rail, 10 a accompanying road, 11 a deflection rail, 12 a descending slope straight pipe, 13 an extension straight pipe, and A a bending angle formed by the front end pipeline and the rear end pipeline.
Detailed Description
The present application is not limited to the following examples, and specific implementations may be determined according to the technical solutions and practical situations of the present application.
Embodiment 1, as shown in fig. 1 to 2, a large-caliber PCCP water pipeline closure structure includes a closure opening 5, a front end pipeline 6, a rear end pipeline 7, a front end rail 8, a rear end rail 9 and a accompanying road 10; the front end pipeline 6 and the rear end pipeline 7 are both linear pipelines, the front end pipeline 6 and the rear end pipeline 7 are arranged in an included angle, and a gap is reserved at the intersection of the front end pipeline 6 and the rear end pipeline 7 so as to form a folding opening 5; the front end rails 8 are distributed on two sides of the front end pipeline 6 along the axis of the front end pipeline 6, and the rear end rails 9 are distributed on two sides of the rear end pipeline 7 along the axis of the rear end pipeline 7; the back of a bending angle A formed by the front end pipeline and the rear end pipeline is provided with an accompanying road 10 corresponding to the rear end pipeline 7; one end of the front end track 8, which is positioned at the folding port 5, is connected with a deflection track 11 which is deflected to one side of the accompanying road 10 and can bypass the port of the rear end pipeline 7; the accompanying road 10 is connected to a descending slope 12 which can lower the level and is connected to the deflecting rail 11.
According to the method, a folding port 5 is arranged at the corner of the pipeline, a portal frame is erected through a rear-end track 9, and a complete rear-end pipeline 7 is normally installed through the portal frame; erecting a portal frame through a front end track 8, sequentially installing PCCP pipes towards the reserved folding port 5 until the last one to two PCCP pipe joints, wherein at the moment, due to angle limitation, a pipe transporting vehicle installed on the PCCP pipes cannot enter the track, and the front end track 8 is extended and deflected to form a deflection track 11 capable of bypassing the port of a rear end pipeline 7; the pipe transporting vehicle is poured into a descending slope 12 through a accompanying road 10 so as to enter the middle part of a deflection track 11, and one to two sections of PCCP pipes reserved finally are installed on a gantry unloading pipe to form a complete front-end pipeline 6.
The folded pipe is about 10 tons in weight and is manufactured in sections; therefore, the folding installation can be finished only by a small-tonnage truck crane, and the construction cost is saved.
As shown in fig. 1, a bending angle a formed by the front end pipeline and the rear end pipeline refers to an angle at which the front end pipeline 6 and the rear end pipeline 7 are respectively extended and connected to each other and then bent, that is, a bending angle of the folded pipe.
As shown in fig. 1, the bending angle a formed by the front end pipeline and the rear end pipeline is 177 to 100 degrees.
As shown in fig. 1, when the bending angle a formed by the front end pipeline and the rear end pipeline is less than or equal to 140 degrees, the deflecting rail 11 is of a whole segment type, and the deflecting rail 11 is connected with the front end rail 8 and arranged at an included angle.
At the moment, the front end pipeline 6 and the rear end pipeline 7 are bent greatly, so that a larger space is provided for the deflection track 11 to leave the rear end pipeline 7; the angle can be adjusted only when the deflection track 11 is connected with the front end track 8 in a butt joint mode.
As shown in fig. 1, when the bending angle a formed by the front end pipeline and the rear end pipeline is greater than 140 degrees, the deflection tracks 11 are in a sectional type, and the deflection tracks 11 of adjacent sections are arranged in an included angle.
At the moment, the front end pipeline 6 and the rear end pipeline 7 are bent little, and no space is available for the deflection track 11 to leave the rear end pipeline 7; the deflection track 11 needs to be adjusted by a large angle and deflected; in order to prevent the portal frame from being capable of smoothly and stably travelling on the track, the deflection track 11 is made into a sectional type, the length of each section is 1-2 meters, and therefore the portal frame can smoothly and safely travel through a structural mode of multi-section adjustment and small-angle adjustment of each section.
As shown in fig. 1, the accompanying path 10 is arranged in parallel with the rear pipeline 7, the front pipeline 6 comprises a plurality of PCCP pipes connected in a butt joint mode, and the distance between the accompanying path 10 and the rear pipeline 7 is not less than twice the length of one PCCP pipe.
The pipe transportation vehicle can be poured into the descending slope 12 to enter the deflection track 11. The accompanying road 10 can be extended continuously along the pipeline direction at the front end, so that the pipe carrier can conveniently move.
As shown in fig. 2, the folding pipe comprises an elbow and a length-adjustable straight pipe 13, wherein the elbow comprises a left straight pipe 1, a left butt joint pipe 2, a right butt joint pipe 3 and a right straight pipe 4 which are connected in sequence; the inner diameters of the left straight pipe 1, the left butt joint pipe 2, the right butt joint pipe 3 and the right straight pipe 4 are all consistent, and the outer diameters of the left straight pipe 1, the left butt joint pipe 2, the right butt joint pipe 3 and the right straight pipe 4 are all consistent; the section of the left butt joint pipe 2 along the central plane is a right trapezoid, and the port of the left butt joint pipe 2 corresponding to the right-angled waist of the right trapezoid is fixedly connected with the left straight pipe 1 through girth welding; the structure of the right butt joint pipe 3 is bilaterally symmetrical to that of the left butt joint pipe 2, and the port of the left butt joint pipe 2 corresponding to the oblique waist of the right trapezoid is connected with the port of the right butt joint pipe 3 corresponding to the oblique waist of the right trapezoid in a spot welding manner.
The section of the left butt joint pipe 22 along the central plane is in a right trapezoid shape, so that the axes of the left straight pipe 11 and the left butt joint pipe 22 can be ensured to be overlapped; the structure of the right butt joint pipe 33 is bilaterally symmetrical to that of the left butt joint pipe 22; the axes of the right straight pipe 43 and the right butt joint pipe 34 can be ensured to be coincident; therefore, the included angle between the axis of the left butt joint pipe 22 and the axis of the right butt joint pipe 33 is the angle of the elbow to be measured. The spot welding connection of the left butt joint pipe 22 and the right butt joint pipe 33 can realize the advanced prejudgment and effective control of the angle in the manufacturing process of the pipe fitting with the angle; avoiding the angular deviation and the material loss. The length-adjusting straight pipe 13 is measured, cut and finally welded on site according to the actual length.
Embodiment 2, a method for installing a large-caliber PCCP water conveying pipeline in a pipe arrangement manner at a closure section comprises the following steps: selecting the position of a folded pipe in the pipeline, and taking the inflection point of the pipeline as a folded section; the second step is that: reserving a folding opening 5 for installing a folding pipe; the third step: a front end rail 8 is laid forwards along the reserved folding opening 5, and a rear end rail 9 is laid backwards; the fourth step: erecting a portal frame through a rear end rail 9, and sequentially installing PCCP pipes towards or away from the direction of the folding opening 5 to form a rear end pipeline 7; the fifth step: erecting a portal frame through a front end rail 8, sequentially installing PCCP pipes towards the reserved folding opening 5 direction, and reserving the last to two sections of PCCP pipe joints; and a sixth step: at the folding port 5, the front end track 8 is lengthened and shifted, so that the formed deflection track 11 bypasses the port of the rear end pipeline 7; the seventh step: on the back of one side of a bending angle A formed by the front end pipeline and the rear end pipeline, an accompanying road 10 corresponding to the rear end pipeline 7 is built, and then a descending slope 12 connecting the accompanying road 10 and a deflection track 11 is built; the pipe transporting vehicle is poured into a descending slope 12 through a accompanying road 10 so as to enter a deflection track 11, and one to two sections of PCCP pipes reserved finally are installed on a gantry unloading pipe to form a front-end pipeline 6; eighth step: and (5) installing the folding pipe on the folding opening 5 by using a truck crane for folding.
By adopting the method, the PCCP required by the calandria can be smoothly installed, the folding position of the steel pipe fitting is reserved, and the pipeline folding can be realized by hiring a small-tonnage truck crane during folding, so that the construction cost is saved; the method is tested and applied in the installation of PCCP (prestressed concrete cylinder pipe) pipelines of national major hydraulic engineering water pipeline engineering, and has a good effect. Meanwhile, the method is suitable for mounting and folding pipes made of other materials and specifications, has wide application range and can be further popularized and applied.
As shown in fig. 1 to 2, when the bending angle a formed by the front end pipeline and the rear end pipeline is greater than 100 degrees and less than or equal to 140 degrees, the deflecting rail 11 is a whole segment type, and the deflecting rail 11 is connected with the front end rail 8 and arranged at an included angle.
As shown in fig. 1 to 2, when the bending angle a formed by the front end pipeline and the rear end pipeline is greater than 140 degrees and less than 177 degrees, the deflecting rail 11 is in a sectional type, and the deflecting rails 11 of adjacent sections are arranged at an included angle.
In this document, "upper", "lower", "front", "rear", "left", "right", and the like are used only to indicate relative positional relationships between relevant portions, and do not limit absolute positions of the relevant portions.
The technical characteristics form the embodiment of the application, the embodiment has strong adaptability and implementation effect, and unnecessary technical characteristics can be increased or decreased according to actual needs to meet the needs of different situations.

Claims (9)

1.一种大口径PCCP输水管线合拢段架构，其特征在于：包括合拢口、前端管线、后端管线、前端轨道、后端轨道和伴行路；前端管线与后端管线均为直线管线，前端管线与后端管线呈夹角布置且前端管线与后端管线在交汇处留有缺口从而形成合拢口；前端轨道沿着前端管线的轴线分布于前端管线的两侧，后端轨道沿着后端管线的轴线分布于后端管线的两侧；在前端管线与后端管线形成的折弯角的背面设有与后端管线相应的伴行路；前端轨道位于合拢口的一端连接有向伴行路一侧偏移并能绕过后端管线端口的偏转轨道；伴行路连接有可将高度下降并连接至偏转轨道的下降坡。1. a large-diameter PCCP water pipeline closing section structure, is characterized in that: comprise closing mouth, front-end pipeline, back-end pipeline, front-end rail, back-end rail and accompanying road; Front-end pipeline and back-end pipeline are straight pipelines, The front-end pipeline and the rear-end pipeline are arranged at an angle, and a gap is left at the intersection between the front-end pipeline and the rear-end pipeline to form a closing opening; the front-end rails are distributed on both sides of the front-end pipeline along the axis of the front-end pipeline, and the rear-end The axis of the end pipeline is distributed on both sides of the rear pipeline; the back of the bending angle formed by the front pipeline and the rear pipeline is provided with an accompanying road corresponding to the rear pipeline; one end of the front track located at the closing port is connected with a directional accompanying road A deflected track that is offset on one side and can bypass the rear end line port; the accompanying road is connected with a descending ramp that lowers the height and connects to the deflected track. 2.根据权利要求1所述的大口径PCCP输水管线合拢段架构，其特征在于：前端管线与后端管线形成的折弯角为177度至100度。2 . The large-diameter PCCP water pipeline closing section structure according to claim 1 , wherein the bending angle formed by the front-end pipeline and the rear-end pipeline is 177 degrees to 100 degrees. 3 . 3.根据权利要求2所述的大口径PCCP输水管线合拢段架构，其特征在于：当前端管线与后端管线形成的折弯角小于等于140度时，偏转轨道为整段式，偏转轨道与前端轨道相连并呈夹角布置。3. The large-diameter PCCP water pipeline closing section structure according to claim 2, characterized in that: when the bending angle formed by the front-end pipeline and the rear-end pipeline is less than or equal to 140 degrees, the deflection track is a whole-section type, and the deflection track Connected to the front rail and arranged at an angle. 4.根据权利要求2所述的大口径PCCP输水管线合拢段架构，其特征在于：当前端管线与后端管线形成的折弯角大于140度时，偏转轨道为分段式，相邻段的偏转轨道呈夹角布置。4. The large-diameter PCCP water pipeline closing section structure according to claim 2, characterized in that: when the bending angle formed by the front-end pipeline and the rear-end pipeline is greater than 140 degrees, the deflection track is segmented, and adjacent sections The deflection tracks are arranged at an angle. 5.根据权利要求1或2或3或4所述的大口径PCCP输水管线合拢段架构，其特征在于：伴行路与后端管线平行分布，前端管线包括多节对接相连PCCP管，伴行路与后端管线的间距不小于一节PCCP管长度的两倍。5. according to claim 1 or 2 or 3 or 4 described large-diameter PCCP water conveyance pipeline closing section structure, it is characterized in that: accompanying road and back-end pipeline are distributed in parallel, and front-end pipeline comprises multi-section butt-connected PCCP pipe, accompanying road The distance from the back-end pipeline is not less than twice the length of a PCCP pipe. 6.根据权利要求1或2或3或4所述的大口径PCCP输水管线合拢段架构，其特征在于：还包括合拢管，合拢管包括弯头和调长直管，弯头包括左直管、左对接管、右对接管和右直管；左直管、左对接管、右对接管和右直管的内径全部一致，左直管、左对接管、右对接管和右直管的外径全部一致；左对接管沿着中心面的截面为直角梯形，直角梯形的直角腰对应的左对接管的端口与左直管通过环缝焊接固定相连；右对接管的结构与左对接管的结构左右对称，直角梯形的斜腰对应的左对接管的端口与直角梯形的斜腰对应的右对接管的端口点焊相连。6. The large-diameter PCCP water pipeline closing section structure according to claim 1 or 2 or 3 or 4, characterized in that: it also comprises a closing pipe, the closing pipe comprises an elbow and a length-adjusting straight pipe, and the elbow comprises a left straight pipe. pipe, left butt pipe, right butt pipe and right straight pipe; the inner diameters of the left straight pipe, left butt pipe, right butt pipe and right straight pipe are all the same, and the left straight pipe, left butt pipe, right butt pipe and right straight pipe The outer diameters are all the same; the cross-section of the left butt pipe along the center plane is a right-angled trapezoid, and the port of the left butt pipe corresponding to the right-angle waist of the right-angled trapezoid is fixedly connected with the left straight pipe by circumferential seam welding; the structure of the right butt pipe is connected with the left butt pipe The structure of the right-angled trapezoid is symmetrical on the left and right, and the port of the left butt pipe corresponding to the oblique waist of the right-angled trapezoid is connected with the port of the right butt pipe corresponding to the oblique waist of the right-angle trapezoid by spot welding. 7.一种大口径PCCP输水管线合拢段布管安装方法，其特征在于包括下述步骤：7. A large-diameter PCCP water pipeline closing section pipe layout installation method is characterized in that comprising the following steps: 第一步：选择管线中合拢管的位置，将管线拐点处作为合拢段；Step 1: Select the position of the folded pipe in the pipeline, and take the inflection point of the pipeline as the folded segment; 第二步：预留用于安装合拢管的合拢口；Step 2: Reserve the closing port for installing the closing tube; 第三步：沿着预留的合拢口向前铺设前端轨道，向后铺设后端轨道；Step 3: Lay the front track forward along the reserved closing opening, and lay the rear track backward; 第四步：通过后端轨道架设龙门架，朝向或者背离合拢口方向顺次安装PCCP管，形成后端管线；Step 4: Set up a gantry through the rear track, and install PCCP pipes in sequence toward or away from the closing and closing ports to form a rear-end pipeline; 第五步：通过前端轨道架设龙门架，朝向预留的合拢口方向顺次安装PCCP管，预留最后一至两节PCCP管管节；Step 5: Set up a gantry through the front track, install the PCCP pipes in sequence toward the reserved closing port, and reserve the last one or two PCCP pipe sections; 第六步：在合拢口处，将前端轨道延长并偏移，令形成的偏转轨道绕过后端管线端口；Step 6: At the closing port, extend and offset the front-end track, so that the formed deflection track bypasses the rear-end pipeline port; 第七步：在前端管线与后端管线形成的折弯角一侧的背面，修建与后端管线相应的伴行路，再修建连接伴行路和偏转轨道的下降坡；运管车通过伴行路倒入下降坡从而进入偏转轨道，龙门架卸管安装最后预留的一至两节PCCP管，组成前端管线；Step 7: On the back side of the bending angle formed by the front-end pipeline and the rear-end pipeline, build an accompanying road corresponding to the rear-end pipeline, and then build a descending slope connecting the accompanying road and the deflection track; Enter the descending slope to enter the deflection track, and install the last reserved one to two PCCP pipes to form the front-end pipeline; 第八步：利用汽车吊将合拢管安装在合拢口，进行合拢。The eighth step: use the car crane to install the closing tube on the closing mouth and close it. 8.根据权利要求7所述的大口径PCCP输水管线合拢段布管安装方法，其特征在于：当前端管线与后端管线形成的折弯角大于100度并小于等于140度时，偏转轨道为整段式，偏转轨道与前端轨道相连并呈夹角布置。8 . The installation method of large-diameter PCCP water transmission pipeline closing section according to claim 7 , wherein: when the bending angle formed by the front-end pipeline and the rear-end pipeline is greater than 100 degrees and less than or equal to 140 degrees, the deflection track For the whole section, the deflection track is connected with the front track and arranged at an included angle. 9.根据权利要求7所述的大口径PCCP输水管线合拢段布管安装方法，其特征在于：当前端管线与后端管线形成的折弯角大于140度并小于177度时，偏转轨道为分段式，相邻段的偏转轨道呈夹角布置。9. The installation method for the closing section of the large-diameter PCCP water transmission pipeline according to claim 7, characterized in that: when the bending angle formed by the front-end pipeline and the rear-end pipeline is greater than 140 degrees and less than 177 degrees, the deflection track is Segmented, the deflection tracks of adjacent segments are arranged at an angle.
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