CN-121977114-A - Composite pipeline and construction method thereof

CN121977114ACN 121977114 ACN121977114 ACN 121977114ACN-121977114-A

Abstract

The invention discloses a composite pipeline and a construction method thereof, wherein the construction method comprises the following steps of lifting a glass fiber reinforced plastic pipe and lowering the glass fiber reinforced plastic pipe along the top opening of a concrete pipe; the method comprises the steps of measuring the sizes of a concrete pipe and a glass fiber reinforced plastic pipe, preparing a longitudinal support die and a circumferential support die through 3D printing, lowering the longitudinal support die into an annular gap between the concrete pipe and the glass fiber reinforced plastic pipe, fixedly connecting two ends of the longitudinal support die with different circumferential support dies, pouring a geopolymer layer precursor, removing the die after maintenance to obtain a first geopolymer filling layer, conveying the obtained product to a site operation well site for pushing construction, sequentially pushing the obtained product into a pre-excavated tunnel or hole, staggering the first geopolymer filling layers of adjacent composite pipes, pouring a second geopolymer after the pushing construction is completed, and maintaining to obtain a second geopolymer filling layer. The invention has high construction efficiency and can obtain the composite pipeline with permeation resistance, corrosion resistance, good integrity and good durability.

Inventors

XU HAOQING
YUAN SHAOPENG
JIN GUOLONG
LI HONGQIAO
WANG RUOCHEN
XU WENXUAN
WU WENJING
WANG YUYING

Assignees

江苏科技大学
中船第九设计研究院工程有限公司

Dates

Publication Date: 20260505
Application Date: 20251219

Claims (10)

1. The construction method of the composite pipeline is characterized by comprising the following steps of: firstly, lifting the glass fiber reinforced plastic pipe (1) and lowering the glass fiber reinforced plastic pipe along the top opening of the concrete pipe (2) to enable the glass fiber reinforced plastic pipe to be positioned in the inner cavity of the concrete pipe (2); measuring the sizes of a concrete pipe (2) and a glass fiber reinforced plastic pipe (1), and preparing a longitudinal support die (3) and a circumferential support die (4) through 3D printing; Thirdly, the pre-assembled longitudinal support mould (3) is axially lowered into an annular gap between the concrete pipe (2) and the glass reinforced plastic pipe (1), and two ends of the longitudinal support mould (3) are fixedly connected with different annular support moulds (4); Pouring a geopolymer layer precursor into an arc-shaped cavity between the longitudinal support die (3) and the longitudinal support die (3), the concrete pipe (2) and the glass fiber reinforced plastic pipe (1), curing, and removing the die to obtain a first geopolymer filling layer (5); Step five, conveying the objects obtained in the step four to the site operation well site of pushing construction, sequentially pushing the objects into pre-excavated tunnels or holes, and staggering first geopolymer filling layers (5) of adjacent composite pipelines; And step six, pouring a second-stage polymer after pushing construction is completed, filling a geopolymer layer precursor into an annular cavity formed by enclosing the concrete pipe (2), the glass fiber reinforced plastic pipe (1) and the first geopolymer filling layer (5), and curing to obtain a second geopolymer filling layer (6).
2. The construction method of the composite pipeline according to claim 1, wherein the geopolymer layer precursor comprises fly ash, slag, caustic soda flakes and water, and the mass ratio of the geopolymer layer precursor to the caustic soda flakes is 4:10:0.42-0.56:7-7.7.
3. The construction method of the composite pipeline according to claim 2, wherein the preparation method of the geopolymer layer precursor is characterized in that slag and fly ash are uniformly stirred by adopting a dry mixing method to form the precursor, flake alkali is dissolved in water to form an exciting agent, and finally the precursor and the exciting agent are mixed to prepare the geopolymer layer precursor.
4. The method for constructing a composite pipeline according to claim 1, wherein the permeability coefficient of the geopolymer layer precursor is less than 10 -7 cm/s when seawater is used as the percolate.
5. The construction method of the composite pipeline according to claim 1, wherein in the second step, the outer surface of the longitudinal supporting die (3) is completely attached to the concrete pipe (2) and the glass fiber reinforced plastic pipe (1).
6. The method for constructing a composite pipeline according to claim 1, wherein in the third step, vaseline is smeared on the surface of the annular supporting die (4) after the annular supporting die is fixedly connected with the longitudinal supporting die (3).
7. The construction method of the composite pipeline according to claim 1, wherein in the third step, the longitudinal supporting mold (3) comprises a plurality of vertically inserted sub supporting molds (31), connecting ports (311) for fixing the annular supporting molds (4) are arranged on the side surfaces of the sub supporting molds (31), a receiving block (312) is arranged on the top surface, a socket (313) is arranged on the bottom surface, the receiving block (312) is matched with the socket (313), and the height of the receiving block (312) is half of that of the sub supporting molds (31).
8. The method for constructing a composite pipeline according to claim 1, wherein in the fourth step, the arc length of the first geopolymer filling layer (5) is 1/6-1/4 of the circumference of the concrete pipe (2).
9. The construction method of the composite pipeline according to claim 1, wherein in the fourth step, the maintenance time is 24-36 hours.
10. A composite pipeline obtained by the construction method of the composite pipeline according to any one of claims 1-9 is characterized by comprising a glass fiber reinforced plastic pipe (1), a first geopolymer filling layer (5), a second geopolymer filling layer (6) and a concrete pipe (2), wherein the first geopolymer filling layer (5) and the second geopolymer filling layer (6) are enclosed into a hollow annular shape and are arranged between the glass fiber reinforced plastic pipe (1) and the concrete pipe (2), and a plurality of the composite pipelines are fixedly connected with each other through a plurality of the second geopolymer filling layers (6).

Description

Composite pipeline and construction method thereof Technical Field The invention belongs to a pipeline and a construction method thereof, in particular to a composite pipeline and a construction method thereof. Background The concrete pipeline is a common water taking and draining pipeline, but the inner wall of the concrete pipeline is rough, so that the transportation efficiency is reduced, the anti-seepage performance of the concrete pipeline is poor, seawater, polluted liquid and the like in the pipeline easily permeate into steel bars in the pipeline, the steel bars are corroded, the bonding performance between the steel bars and the concrete is affected, and the bearing capacity of the composite pipeline is reduced. Based on the above, glass fiber reinforced plastic lining concrete pipelines are generated, glass fiber reinforced plastic has excellent corrosion resistance, the inner wall is smooth, the transmission efficiency is high, and the composite pipeline still has some problems to be solved. The pipe jacking construction is a common pipeline construction method, belongs to non-excavation construction, performs jacking construction on a pipeline in a foundation pit through a specific pipe jacking device, has small influence on the ground environment, and effectively reduces the cost, but lacks a construction method suitable for pipe jacking construction of a composite pipeline at present. Patent publication number CN109538845A discloses a glass steel lining concrete pipe, set up the connecting piece between inlayer glass steel pipe and the outer concrete pipe, caused certain degree of difficulty for the pipeline construction, be connected with the bellmouth through the interface between the glass steel pipe, the concrete pipe in the outside is revealed to interface and bellmouth seam crossing by the transportation liquid, has adverse effect to pipeline durability. Patent publication number CN217482182U discloses a glass steel inside lining concrete pipe of flexonics, and its different tube coupling is connected also to adopt interface and bellmouth, is unfavorable for the going on of push pipe construction. In general, on the premise of meeting the anti-seepage use requirement of the existing composite pipeline, the durability and the constructability are required to be further improved, and the construction method is complicated. Disclosure of Invention The invention aims to overcome the defects in the prior art, and aims to provide a construction method of a composite pipeline with high construction efficiency. The technical scheme is that the construction method of the composite pipeline comprises the following steps: step one, lifting the glass fiber reinforced plastic pipe and lowering the glass fiber reinforced plastic pipe along the top opening of the concrete pipe to enable the glass fiber reinforced plastic pipe to be positioned in the inner cavity of the concrete pipe; Measuring the sizes of a concrete pipe and a glass fiber reinforced plastic pipe, and preparing a longitudinal support die and a circumferential support die through 3D printing; thirdly, the pre-assembled longitudinal support mould is axially lowered to an annular gap between the concrete pipe and the glass reinforced plastic pipe, and two ends of the longitudinal support mould are fixedly connected with different annular support moulds; Pouring a geopolymer layer precursor into the arc-shaped cavity between the longitudinal support die and the longitudinal support die, between the concrete pipe and the glass fiber reinforced plastic pipe, and removing the die after curing to obtain a first geopolymer filling layer; Step five, conveying the objects obtained in the step four to the site operation well site of pushing construction, sequentially pushing the objects into pre-excavated tunnels or holes, and mutually staggering first geopolymer filling layers of adjacent composite pipelines; and step six, pouring the polymer in the second stage after the pushing construction is completed, filling the precursor of the geopolymer layer into an annular cavity formed by enclosing the concrete pipe, the glass fiber reinforced plastic pipe and the first geopolymer filling layer, and curing to obtain the second geopolymer filling layer. Further, the geopolymer layer precursor comprises fly ash, slag, caustic soda flakes and water, and the mass ratio of the precursor to the caustic soda flakes is 4:10:0.42-0.56:7-7.7. Too little amount of caustic soda flakes can cause the reaction rate to slow down, delay the construction progress, too much amount of caustic soda flakes can cause the reaction to be too rapid, reduce construction and heterology. The preparation method of the precursor of the geopolymer layer comprises the steps of stirring slag and fly ash uniformly by adopting a dry mixing method to form a precursor, dissolving flake alkali into water to form an exciting agent, and finally mixing the precursor with the exciting agent t