WO2014012305A1 - 一种修复大直径混凝土供水管道的方法 - Google Patents

一种修复大直径混凝土供水管道的方法 Download PDF

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Publication number
WO2014012305A1
WO2014012305A1 PCT/CN2012/083362 CN2012083362W WO2014012305A1 WO 2014012305 A1 WO2014012305 A1 WO 2014012305A1 CN 2012083362 W CN2012083362 W CN 2012083362W WO 2014012305 A1 WO2014012305 A1 WO 2014012305A1
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WIPO (PCT)
Prior art keywords
steel liner
water supply
supply pipe
concrete water
diameter
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PCT/CN2012/083362
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English (en)
French (fr)
Inventor
陈先明
王宗敏
张雪峰
丁家仁
王永平
刘宣进
Original Assignee
中国长江三峡集团公司
中国水利电力对外公司
中建工业设备安装有限公司
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Application filed by 中国长江三峡集团公司, 中国水利电力对外公司, 中建工业设备安装有限公司 filed Critical 中国长江三峡集团公司
Publication of WO2014012305A1 publication Critical patent/WO2014012305A1/zh
Priority to PH12014501780A priority Critical patent/PH12014501780A1/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
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
    • F16L55/162—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe
    • F16L55/1645—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a sealing material being introduced inside the pipe by means of a tool moving in the pipe
    • F16L55/16455—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a sealing material being introduced inside the pipe by means of a tool moving in the pipe a part of the tool defining, together with the inner wall of the pipe, an enclosed space into which sealing material is injected
    • 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
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
    • F16L55/162—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe
    • F16L55/165—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a pipe or flexible liner being inserted in the damaged section
    • F16L55/1652—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a pipe or flexible liner being inserted in the damaged section the flexible liner being pulled into the damaged section

Definitions

  • the invention relates to a method for repairing leakage of concrete pipes, in particular to a method for repairing large-diameter concrete water supply pipes in water conservancy and hydropower projects.
  • the concrete water supply pipeline After a certain period of operation, the concrete water supply pipeline will have different degrees of water leakage due to various reasons, which will have certain impact on the quality of water supply. When the water leakage is serious, the water supply safety may be seriously threatened and must be repaired.
  • the commonly used concrete water supply pipe repair methods usually include a traditional lining method, a lining method, a composite material lining method, and a coating method.
  • the traditional lining method also called intubation method, is the earliest used non-excavation underground pipeline repair method, which is suitable for the repair of various underground pipelines.
  • the new pipe may be a continuous long pipe which is pre-butt welded by a polyethylene pipe, or may be a short plastic pipe or a glass pipe of one section, and is respectively sent to the old pipe after the working pit is connected.
  • the advantage of the traditional lining method is that it is simple and easy to operate, and the construction cost is low; the main disadvantage is that the over-flow section loss of the pipeline after repair is large.
  • the interlining method is to temporarily reduce the diameter of the inner liner into the pipeline to be repaired, and then restore the diameter of the inner liner to form a close fit with the old pipe.
  • the method has the advantages of no need for grouting, fast construction speed, small loss of cross-flow section, adaptable to curved tube with large curvature radius, long-distance repair, few joints or even no; can be used in excavation work pits or people Construction is carried out in the well.
  • the disadvantage is that the pipe joints need to be excavated; the structural damage of the old pipes will lead to construction difficulties; the different methods have different technical requirements for the operators.
  • the composite material lining method is to transport the hose material to the site, use the pressure of water and air to turn the material over to the pipe and make it close to the inner wall of the pipe, and heat it by hot water, steam, spray or ultraviolet light.
  • the method has the advantages of fast construction speed, no joint, smooth surface and good fluidity; can adapt to non-circular cross section, curved pipe section and small deformation; can use existing human well or a small amount of excavation as an entrance There is no annular space between the old and new pipes, and the new pipe has the functions of anti-corrosion and anti-seepage.
  • the disadvantages are: special construction equipment is required, the quality of the workers is high; the project scale is small, the cost is high; during construction, the penetration of groundwater must be controlled, and the liner needs to bear the pressure together with the old pipe.
  • the above repair method mainly focuses on repairing the water supply pipeline below 2 meters in diameter. Due to the large diameter of the large diameter water supply pipeline, the repair material needs to withstand the pressure and the construction environment is complicated, and there is almost no mature repair method. Due to the limitation of environmental conditions, the above methods often have poor repairing effect, short durability, slow repair speed, and high repair and maintenance costs.
  • the technical problem to be solved by the invention is to provide a method for repairing a large-diameter concrete water supply pipeline, which can solve the problem of repairing a large-diameter concrete water supply pipeline, which is convenient in construction, durable, low in cost, safe and reliable.
  • the technical solution adopted by the present invention is: a method for repairing a large-diameter concrete water supply pipe, firstly, a water leakage condition inspection of a large-diameter concrete water supply pipe is performed, and the concrete surface of the pipe to be repaired is chiseled and decontaminated. Selecting a large-diameter concrete water supply pipe to excavate the working pit at an appropriate position.
  • the function of the excavation work pit is to facilitate the entry of personnel, equipment and materials.
  • the method comprises the following steps:
  • a plurality of steel liner segments are welded and formed into steel bushings by section, and the steel liner is fixed to the pipe wall of the large-diameter concrete water supply pipe;
  • step (3) is that after the steel liner is installed for a certain length of length, the inner support is installed in the steel liner to reinforce the steel liner, and a plurality of grouting holes and a plurality of drainage vents are formed on the steel liner.
  • the steel liner end is sealed and a plurality of grouting observation holes are left, and a step of removing the inner support is added between step (4) and step (5).
  • the steel liner section is a thin-walled steel liner section having a wall thickness of 6-9 mm, and the diameter of the steel liner section is 40 to 60 mm smaller than the diameter of the large-diameter concrete water supply pipeline, preferably 50 mm, which is sufficient for grouting. Space.
  • the steel liner is fixed to the pipe wall of the large-diameter concrete water supply pipe by the expansion bolt.
  • the longitudinal seam edges of the steel-lined pipe joints overlap to form a structure with a changeable diameter.
  • the diameter can be contracted to facilitate the transportation inside the pipe.
  • the inner and outer surfaces of the steel-lined pipe joints are rust-proof and corrosion-proof, and the steel-lined pipes are welded by sections. At the same time, the longitudinal seam is welded.
  • a plurality of grouting holes are opened at the bottom of the steel liner, and a plurality of drain and exhaust holes are opened at the top of the steel liner.
  • step (4) the non-shrinkage cement mortar used for the stage grouting is performed.
  • the invention provides a method for repairing a large-diameter concrete water supply pipe. Since a welded steel pipe is used instead of a concrete pipe over-flow, although a small amount of over-flow section is reduced, However, the over-flow rough filter is greatly reduced, the flow rate is increased, and the large-diameter concrete pipe is more obvious.
  • the steel liner is durable and safe and reliable: the purpose of long-term maintenance-free use after repair is ensured, and the safe water supply is guaranteed.
  • Figure 1 is a repair process diagram of the present invention
  • Figure 2 is a cross-sectional view taken along line A-A of Figure 1;
  • Figure 3 is a structural view of a large-diameter concrete water supply pipe repaired by the method of the present invention
  • Figure 4 is a schematic view showing the structure of a steel liner pipe joint of the present invention.
  • a method for repairing a large-diameter concrete water supply pipeline firstly stops the large-diameter concrete water supply pipeline 1-1, passes through the inspection hole and enters the pipeline, performs detailed inspection on the water leakage condition, determines the repaired portion, and formulates a repair plan;
  • the excavation work pit 3-1 the specific size of the work pit 3-1 to meet the steel liner section 2 -1 hoisting and transportation shall prevail; and the inner wall of the pipeline to be repaired on the large-diameter concrete water supply pipe 1-1 shall be chiseled, rinsed with feng shui, and pretreated in concentrated or obvious water leakage parts (using a plugging agent or The grouting method seals the water leakage, and the water pipe is buried in the large water leakage part to guide the water into the steel lining pipe. After the segment grouting is completed, the grouting is timely sealed.
  • the method consists of the following steps:
  • the steel liner section 2-1 is rolled, the wall thickness of the steel liner section 2-1 is 6-9 mm, and the diameter of the steel liner section 2-1 is 1-1 than that of the large diameter concrete water supply pipeline.
  • the diameter is 40 ⁇ 60mm, preferably 50mm, and the steel liner 2-1 is derusted and treated.
  • the rust and anti-corrosion treatment is anti-corrosion primer for steel inner liner 2-1 inner wall anti-corrosion primer, steel liner Section 2-1 outer wall anti-corrosion coating cement mortar;
  • a plurality of grouting holes 3-4 are opened at the bottom of the steel liner 1-2, a plurality of drainage vents 3-5 are opened at the top of the steel liner 1-2, and the grouting pipes 3-6 are installed, and the connection is injected.
  • Slurry equipment 3-7; use cement water glass mortar 3-8 to seal the end and leave a plurality of grouting observation holes 3-9, the distribution of grouting observation holes 3-9 should be no less than 5 layers (bottom 1, 6 in the middle, 6 in the top, 1 in the top), in order to observe the rising of the grouting slurry in time, so that the concentration of the slurry can be adjusted at any time to ensure the grouting effect;
  • the water test is carried out in sections or once to check the repair effect.
  • a method for repairing a large-diameter concrete water supply pipeline firstly stops the large-diameter concrete water supply pipeline 1-1, passes through the inspection hole and enters the pipeline, performs detailed inspection on the water leakage condition, determines the repaired portion, and formulates a repair plan;
  • the excavation work pit 3-1 the specific size of the work pit 3-1 to meet the steel liner section 2 -1 hoisting and transportation shall prevail; and the inner wall of the pipeline to be repaired on the large-diameter concrete water supply pipe 1-1 shall be chiseled, rinsed with feng shui, and pretreated in concentrated or obvious water leakage parts (using a plugging agent or The grouting method seals the water leakage, and the water pipe is buried in the large water leakage part to lead the water into the steel liner. After the stage grouting is completed, the grouting is timely sealed.
  • the method consists of the following steps:
  • the steel liner section 2-1 is rolled, the wall thickness of the steel liner section 2-1 is 6-9 mm, and the diameter of the steel liner section 2-1 is 1-1 than that of the large diameter concrete water supply pipeline.
  • the diameter is 40 ⁇ 60mm, preferably 50mm, and the steel liner 2-1 is derusted and treated.
  • the rust and anti-corrosion treatment is anti-corrosion primer for steel inner liner 2-1 inner wall anti-corrosion primer, steel liner Section 2-1 outer wall anti-corrosion coating cement mortar;
  • the cement water glass mortar 3-8 is used to seal the end and the plurality of grouting observation holes 3-9 are left, and the distribution of the grouting observation holes 3-9 should be no less than 5 layers (bottom 1 and middle 3) 6 layers, 1 at the top), in order to observe the rising of the grouting slurry in time, so that the slurry concentration can be adjusted at any time to ensure the grouting effect;
  • the water test is carried out in sections or once to check the repair effect.
  • the steel liner is durable, safe and reliable: After the repair, the purpose of long-term maintenance-free use is achieved, and the safe water supply is guaranteed.
  • the repair effect is good
  • the installed steel liner can withstand a certain pressure, can ensure that the dripping does not leak, and quickly restore the function.
  • the steel liner section is designed to change the diameter of the structure, which facilitates the transportation of the steel liner section in the large-diameter concrete water supply pipeline.
  • the steel liner is fixed in the large-diameter concrete water supply pipe through the expansion bolt, which ensures that the gap between the steel liner and the large-diameter concrete water supply pipe is relatively uniform, which is beneficial to the subsequent grouting step.
  • the grouting hole is opened at the bottom of the steel liner, and the exhaust and drainage holes are opened at the top, which is beneficial to ensure full filling, effective elimination of air and accumulated water behind the wall, and improved grouting compactness.

Abstract

一种修复大直径混凝土供水管道的方法，首先对大直径混凝土供水管道（1-1）进行漏水情况检查，将拟修复管段的混凝土表面凿毛并去污，分段开挖工作坑（3-1），该方法包括以下步骤：（1）将多个钢衬管节（2-1）置于大直径混凝土供水管道（1-1）内；（2）将多个钢衬管节（2-1）逐节安装焊接组成钢衬管（1-2），将钢衬管（1-2）固定于大直径混凝土供水管道（1-1）的管壁；（3）在钢衬管（1-2）上开设多个注浆孔（3-4）和多个排水排气孔（3-5），对钢衬管（1-2）端头进行封堵并留设多个注浆观察孔（3-9）；（4）分段注浆；（5）封堵工作坑（3-1），进行通水试验检查修复效果。上述方法施工方便、经久耐用、成本低廉、安全可靠。

Description

一种修复大直径混凝土供水管道的方法 技术领域
本发明涉及一种混凝土管道漏水的修复方法，尤其是一种在水利水电工程中修复大直径混凝土供水管道的方法。
背景技术
混凝土供水管道在运行一定时间后，由于种种原因均出现不同程度的漏水现象，对供水质量带来一定的影响；漏水严重时，还可能严重威胁供水安全，必须进行修补。目前，常用的混凝土供水管道修补方法通常有传统内衬法、穿插内衬法、复合材料翻转内衬法及涂敷法等。
传统的内衬法，也叫插管法，是使用得最早的一种非开挖地下管道修复方法，适用于各种地下管道的修复。施工时，将一根直径稍小的新管直接插入或拉入旧管内，然后向新旧管之间的环形灌浆，予以固结。新管可以是由聚乙烯管预先对接焊而成的连续长管，也可以是一节一节的短塑料管、玻璃钢管，在工作坑连接后分别送人旧管内。传统内衬法的优点是简单易行、施工成本低；其主要缺点是修复后管道的过流断面损失较大。
穿插内衬法是将内衬管暂时缩径后插入待修复管道内，再将内衬管直径复原后从而与旧管形成紧密的配合。该方法的优点是：不需灌浆，施工速度快；过流断面损失很小；可适应较大曲率半径弯管；可长距离修复，接头少，甚至没有；可在开挖的工作坑或人井内进行施工。缺点是：支管接头需开挖进行；旧管的结构破坏会导致施工困难；不同的方法对操作人员技术要求不同。
复合材料翻转内衬法是将软管材料运到工地现场，利用水和空气的压力把材料翻转送至管道并使其紧贴于管道内壁，通过热水、蒸气、喷淋或紫外线加热的方法使树脂材料固化，在旧管内形成一根高强度的内衬树脂新管的方法。该方法的优点是：施工速度快；没有接头、表面光滑、流动性好；可适应非圆形断面、弯曲的管段和有小变形的地方；可利用现有的人井或少量开挖作为入口；新旧管之间没有环形空间、新管具有防腐、抗渗的功能。缺点是：需特殊的施工设备，对工人的素质要求高；工程规模小时，成本较高；施工时，必须控制地下水的渗透，衬管需与旧管一起承受压力。
上述修复方法主要以修复2米直径以下供水管道为主，大直径供水管道由于直径大，修复材料需承受压力大，施工环境复杂，几乎没有成熟的修复方法。而受环境条件的限制，采用上述方法往往修补效果不佳，耐久性不长，修复速度慢，修复维护成本过高。
发明内容
本发明所要解决的技术问题是提供一种修复大直径混凝土供水管道的方法，可以解决大直径混凝土供水管道的修复问题，施工方便、经久耐用、成本低廉、安全可靠。
为解决上述技术问题，本发明所采用的技术方案是：一种修复大直径混凝土供水管道的方法，首先对大直径混凝土供水管道进行漏水情况检查，将拟修复管段的混凝土表面凿毛并去污，选择大直径混凝土供水管道上适当位置分段开挖工作坑，开挖工作坑的作用是方便人员、设备、材料进入，该方法包括以下步骤：
(1)将直径略小于大直径混凝土供水管道直径的多个钢衬管节经工作坑置于大直径混凝土供水管道内；
(2)将多个钢衬管节逐节安装焊接组成钢衬管，将钢衬管固定于大直径混凝土供水管道的管壁；
(3)在钢衬管上开设多个注浆孔和多个排水排气孔，对钢衬管端头进行封堵并留设多个注浆观察孔；
(4)对大直径混凝土供水管道与钢衬管之间的空隙进行分段注浆；
(5)封堵工作坑，进行通水试验检查修复效果。
步骤（3）的优选方案为，在钢衬管安装一定段长后，在钢衬管内安装内支撑以加固钢衬管，在钢衬管上开设多个注浆孔和多个排水排气孔，对钢衬管端头进行封堵并留设多个注浆观察孔，在步骤（4）和步骤（5）之间增加拆除内支撑的步骤。
步骤（1）中，钢衬管节为壁厚6-9mm的薄壁钢衬管节，钢衬管节的直径比大直径混凝土供水管道的直径小40～60mm，优选为50mm，为灌浆留足一定的空间。
步骤（2）中，通过膨胀螺栓将钢衬管固定于大直径混凝土供水管道的管壁。
钢衬管节的纵缝边缘交叠形成可改变直径的结构，直径可以收缩，便于管内运输，钢衬管节的内表面和外表面进行除锈防腐，逐节安装焊接成钢衬管时，同时对纵缝进行焊接。
步骤（3）中，多个注浆孔开设在钢衬管底部，多个排水排气孔开设在钢衬管顶部。
步骤（4）中，进行分段注浆采用的无收缩水泥砂浆。
本发明提供的一种修复大直径混凝土供水管道的方法,由于采用安装焊接的钢衬管代替混凝土管道过流，虽然减少了少量过流断面， 但大大减少了过流糙滤，提高了流速，对大直径混凝土管道更加明显，钢衬管经久耐用，安全可靠： 修复后达到长期免维护使用的目的，安全供水有保障。
附图概述
下面结合附图和实施例对本发明作进一步说明：
图1为本发明的修复工艺图；
图2为图1的A-A向剖视图；
图3为采用本发明方法修复后的大直径混凝土供水管道的结构图；
图4为本发明钢衬管节的结构示意图。
实施方式
实施例一
一种修复大直径混凝土供水管道的方法，首先将大直径混凝土供水管道1-1停水后，通过检查孔进入管道内，对漏水情况进行详细检查，确定修复部位，制订修复方案；
再选择大直径混凝土供水管道1-1上适当的位置（兼顾交通运输、注浆等因素）分段开挖工作坑3-1，工作坑3-1的具体尺寸以能够满足钢衬管节2-1的吊装和运输为准；并对大直径混凝土供水管道1-1上拟修复管道的内壁进行凿毛处理，用风水冲洗干净，在集中或明显漏水部位进行预处理（采用堵漏剂或注浆法封堵漏水，对较大漏水部位埋设导水管将水引至钢衬管内，在分段灌浆完成后，及时注浆封堵）。
该方法由以下步骤组成：
（1）在钢管加工车间卷制钢衬管节2-1，钢衬管节2-1的壁厚为6～9mm，钢衬管节2-1的直径比大直径混凝土供水管道1-1的直径小40～60mm，优选为50mm，并对钢衬管节2-1进行除锈防腐处理，除锈防腐处理为对钢衬管节2-1内壁防腐刷防锈底漆，钢衬管节2-1外壁防腐涂刷水泥砂浆；
（2）用起吊设备把钢衬管节2-1放置在工作坑3-1内,利用无轨运输装置3-2运至安装地点，逐节进行校园对接、焊接制成钢衬管1-2，将钢衬管1-2用膨胀螺栓1-3与固定于大直径混凝土供水管道1-1的管壁，并对焊缝进行无损检测；
（3）在钢衬管1-2底部开设多个注浆孔3-4，在钢衬管1-2顶部开设多个排水排气孔3-5，安装注浆管3-6，连接注浆设备3-7；采用水泥水玻璃砂浆3-8对端头进行封堵并留设多个注浆观察孔3-9，注浆观察孔3-9的分布应不少于5层（底部1个、中部3层6个、顶部1个），以便及时观察注浆浆液上升情况，便于随时调整浆液浓度，确保注浆效果；
（4）利用注浆设备3-7对大直径混凝土供水管道1-1与钢衬管1-2之间的空隙进行分段灌注不收缩水泥砂浆，控制注浆压力，在确保钢衬管1-2不变形的前提下，尽可能注浆饱满；待强一周后进行锤击检查，在空鼓部位开孔补充注浆；
（5）清理管道，对钢衬管1-2进行防腐处理，在钢衬管1-2内部喷涂无毒防腐涂料；
（6）利用钢筋混凝土封堵工作坑3-1；
（7）视修复情况分段或一次进行通水试验以检查修复效果。
实施例二
一种修复大直径混凝土供水管道的方法，首先将大直径混凝土供水管道1-1停水后，通过检查孔进入管道内，对漏水情况进行详细检查，确定修复部位，制订修复方案；
再选择大直径混凝土供水管道1-1上适当的位置（兼顾交通运输、注浆等因素）分段开挖工作坑3-1，工作坑3-1的具体尺寸以能够满足钢衬管节2-1的吊装和运输为准；并对大直径混凝土供水管道1-1上拟修复管道的内壁进行凿毛处理，用风水冲洗干净，在集中或明显漏水部位进行预处理（采用堵漏剂或注浆法封堵漏水，对较大漏水部位埋设导水管将水引至钢衬管内，在分段注浆完成后，及时注浆封堵）。
该方法由以下步骤组成：
（1）在钢管加工车间卷制钢衬管节2-1，钢衬管节2-1的壁厚为6～9mm，钢衬管节2-1的直径比大直径混凝土供水管道1-1的直径小40～60mm，优选为50mm，并对钢衬管节2-1进行除锈防腐处理，除锈防腐处理为对钢衬管节2-1内壁防腐刷防锈底漆，钢衬管节2-1外壁防腐涂刷水泥砂浆；
（2）用起吊设备把钢衬管节2-1放置在工作坑3-1内,利用无轨运输装置3-2运至安装地点，逐节进行校园对接、焊接制成钢衬管1-2，将钢衬管1-2用膨胀螺栓1-3与固定于大直径混凝土供水管道1-1的管壁，并对焊缝进行无损检测；
（3）安装一定段长的钢衬管1-2（其长度根据试验情况确定，原则上一般不超过50米）后，在钢衬管1-2内安装内支撑3-3加固，在钢衬管1-2底部开设多个注浆孔3-4，在钢衬管1-2顶部开设多个排水排气孔3-5，安装注浆管3-6，连接注浆设备3-7；采用水泥水玻璃砂浆3-8对端头进行封堵并留设多个注浆观察孔3-9，注浆观察孔3-9的分布应不少于5层（底部1个、中部3层6个、顶部1个），以便及时观察注浆浆液上升情况，便于随时调整浆液浓度，确保注浆效果；
（4）利用注浆设备3-7对大直径混凝土供水管道1-1与钢衬管1-2之间的空隙进行分段灌注不收缩水泥砂浆，控制注浆压力，在确保钢衬管1-2不变形的前提下，尽可能注浆饱满；待强一周后进行锤击检查，在空鼓部位开孔补充注浆；
（5）清理管道，拆除内支撑3-3，对钢衬管1-2进行防腐，在钢衬管1-2内部喷涂无毒防腐涂料1-5；
（6）利用钢筋混凝土封堵工作坑3-1。
（7）视修复情况分段或一次进行通水试验以检查修复效果。
工业实用性
本发明的有益效果如下：
1 、由于采用安装焊接的钢衬管代替混凝土管道过流，虽然减少了少量过流断面，
但大大减少了过流糙滤，提高了流速，对大直径混凝土管道更加明显，钢衬管经久耐用，安全可靠： 修复后达到长期免维护使用的目的，安全供水有保障。
2 、施工方便，修复速度快：适用于不同的环境条件，技术含量低，施工速度、质量有保证；成本低廉，经济实用：采用常规的施工材料和施工工艺，无化学污染，修复维护费用低。
3 、修复效果好，安装的钢衬管能够承受一定的压力，可以保证滴水不漏，快速恢复功能。
4 、钢衬管节设计成可改变直径的结构，方便了钢衬管节在大直径混凝土供水管道内的运输。
5 、通过膨胀螺栓将钢衬管固定于大直径混凝土供水管道内，保证了钢衬管与大直径混凝土供水管道之间的缝隙相对均匀，有利于后续的灌浆步骤。
6 、在钢衬管内安装内支撑以加固钢衬管，可使得钢衬管能够抵抗注浆压力，确保了施工效果。
7 、在钢衬管底部开设注浆孔，在顶部开设排气、排水孔，有利于保证注浆饱满，壁后空气及积水有效排除，提高了注浆密实度。
8 、利用注浆设备灌注无收缩水泥砂浆，除对混凝土管道进行加固补强外，还能提高结实率，并有效消减了空鼓现象。

Claims (9)

  1. 一种修复大直径混凝土供水管道的方法，首先对大直径混凝土供水管道（1-1）
    进行漏水情况检查，将拟修复管段的混凝土表面凿毛并去污，选择大直径混凝土供水管道（1-1）上适当位置分段开挖工作坑（3-1），其特征在于该方法包括以下步骤：
    （1）将直径略小于大直径混凝土供水管道（1-1）直径的多个钢衬管节（2-1）经工作坑（3-1）置于大直径混凝土供水管道（1-1）内；
    （2）将多个钢衬管节（2-1）逐节安装焊接组成钢衬管（1-2），将钢衬管（1-2）固定于大直径混凝土供水管道（1-1）的管壁；
    （3）在钢衬管（1-2）上开设多个注浆孔（3-4）和多个排水排气孔（3-5），对钢衬管（1-2）端头进行封堵并留设多个注浆观察孔(3-9)；
    （4）对大直径混凝土供水管道（1-1）与钢衬管（1-2）之间的空隙进行分段注浆；
    （5）封堵工作坑（3-1），进行通水试验检查修复效果。
  2. 根据权利要求1所述的一种修复大直径混凝土供水管道的方法，其特征在于：步骤（3）中，钢衬管（1-2）安装一定段长后，在钢衬管（1-2）内安装内支撑（3-3）以加固钢衬管（1-2），在钢衬管（1-2）上开设多个注浆孔（3-4）和多个排水排气孔（3-5），对钢衬管（1-2）端头进行封堵并留设多个注浆观察孔(3-9)。
  3. 根据权利要求2所述的一种修复大直径混凝土供水管道的方法，其特征在于：在步骤（4）和步骤（5）之间增加拆除内支撑（3-3）的步骤。
  4. 根据权利要求1或2所述的一种修复大直径混凝土供水管道的方法，其特征在于：钢衬管节（2-1）为壁厚6-9mm的薄壁钢衬管节，钢衬管节（2-1）的直径比大直径混凝土供水管道（1-1）的直径小40～60mm。
  5. 根据权利要求1或2所述的一种修复大直径混凝土供水管道的方法，其特征在于：步骤（2）中，通过膨胀螺栓（1-3）将钢衬管（1-2）固定于大直径混凝土供水管道（1-1）的管壁。
  6. 根据权利要求1或2所述的一种修复大直径混凝土供水管道的方法，其特征在于：钢衬管节（2-1）的纵缝（2-2）边缘交叠形成可改变直径的结构，逐节安装焊接成钢衬管（1-2）时，同时对纵缝（2-2）进行焊接。
  7. 根据权利要求1或2所述的一种修复大直径混凝土供水管道的方法，其特征在于：钢衬管节（2-1）的内表面和外表面进行除锈防腐。
  8. 根据权利要求1或2所述的一种修复大直径混凝土供水管道的方法，其特征在于：步骤（3）中，在钢衬管（1-2）底部开设多个注浆孔（3-4），在钢衬管（1-2）顶部开设多个排水排气孔（3-5）。
  9. 根据权利要求1或2所述的一种修复大直径混凝土供水管道的方法，其特征在于：步骤（4）中，进行分段注浆采用的无收缩水泥砂浆。
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