CN110701408A

CN110701408A - Sealing method for water pipeline without water interruption for ladder opening

Info

Publication number: CN110701408A
Application number: CN201910970244.5A
Authority: CN
Inventors: 钱兴平; 王子珩; 范世朋; 梅雪冰
Original assignee: SHANGHAI YOUWEI ENGINEERING DESIGN Co Ltd
Current assignee: SHANGHAI YOUWEI ENGINEERING DESIGN Co Ltd
Priority date: 2019-10-12
Filing date: 2019-10-12
Publication date: 2020-01-17

Abstract

The invention discloses a sealing method for a water pipeline water cut-off ladder, which comprises the following steps of ① soaking cut glass fiber felt cloth with resin condensate, ② winding the glass fiber felt cloth coated with the resin condensate and tightly attaching the glass fiber felt cloth to the outer wall of the water pipeline to form a felt cylinder, ③ heating by ultraviolet light to preliminarily cure the felt cylinder, ④ folding a half sleeve ladder outside the felt cylinder and welding a groove on the half sleeve ladder, ⑤ standing, and mounting a gate valve and a hole opener to perform next operation on the water pipeline after secondary complete curing is completed.

Description

Sealing method for water pipeline without water interruption for ladder opening

Technical Field

The invention relates to the field of municipal water supply pipeline construction, in particular to a sealing method for a water pressure pipeline without water cut-off.

Background

With the continuous improvement of urban water supply systems, people have higher and higher requirements on the quality, quantity and continuity of water supplied by tap water. Therefore, the water cut-off time caused by construction cannot be too long, and therefore, a water-free ladder-opening technology is developed in long-term practice.

At present, the steps of the ladder-opening technology without water interruption are as follows: firstly, the half ladder is folded on a water supply pipeline, and two splicing seams are welded by electric welding. Filling hemp between sleeve and water supply pipe earlier, the reuse asbestos cement is clogged, after reaching the compactness requirement, watering maintenance, place several days after, when the cement solidification reaches certain intensity installation gate valve, at the ware of digging a hole of valve opposite side installation, can open the ladder.

The hemp thread and asbestos cement which are adopted for the water-cut-off ladder seal the gap between the sleeve and the pipeline, so that the problems of long construction period, easy water leakage of the pipeline and the like exist.

Disclosure of Invention

Due to the technical problems in the prior art, the application provides a sealing method for a water pipeline without water cut-off, and aims to solve the problems that in the prior art, the construction period is long and the pipeline is prone to water leakage.

In order to achieve the technical purpose, the following technical scheme is adopted in the application:

a sealing method for a water pipeline without breaking water comprises the following steps of ① soaking cut glass fiber felt cloth with resin condensate, ② winding the glass fiber felt cloth coated with the resin condensate and enabling the glass fiber felt cloth to be tightly attached to the outer wall of the water pipeline to form a felt cylinder, ③ heating with ultraviolet light to enable the felt cylinder to be primarily cured, ④ folding a half sleeve ladder outside the felt cylinder and welding a groove on the half sleeve ladder, ⑤ standing, installing a gate valve and a hole opener to conduct the next operation on the water pipeline after secondary curing is completed.

Preferably, the length of the cut glass fiber felt cloth is about 3.5 times of the outer diameter of the pipeline, and the width of the glass fiber felt cloth is consistent with the length of the half sleeve ladder.

Preferably, the glass fiber mat is a glass fiber mat comprising woven and co-woven glass fibers.

Preferably, the resin condensate is a mixed solution of a resin and the curing agent, and the resin has good miscibility with water and is compatible with the glass fiber felt.

Preferably, the resin is a polyester resin, an epoxy resin or a vinyl ester resin.

Preferably, a cobalt-containing compound or an organic peroxide is added as a catalyst to the resin condensate.

Preferably, the glass fiber mat is closely attached to an outer wall of the water passage pipe, and a tip end of the glass fiber mat overlaps with the starting end above the water passage pipe.

Due to the adoption of the technical scheme, the application has the advantages of wide application range and simplicity in operation, the construction period is greatly shortened, and the water leakage phenomenon cannot be caused.

Drawings

Fig. 1 is a schematic flow chart of the present application.

Detailed Description

The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.

Referring to the flow chart shown in fig. 1, the sealing method for a water pipeline without water cut-off mainly includes the following steps: the cut glass fiber mat 1 is impregnated with a resin condensate. The length of the cut glass fiber felt cloth 1 is about 3.5 times of the outer diameter of the pipeline, and the width of the glass fiber felt cloth is equivalent to the length of the half sleeve ladder 3. After the soaking is finished, winding and tightly adhering the glass fiber felt cloth 1 coated with the resin condensate to the outer wall of the water pipeline 2 to form a felt cylinder. The felt cylinder should be closely attached to the original pipeline, and the felt cloth should not have obvious phenomena of protrusion, depression, hollowing and the like. The glass fiber felt is tightly attached to the outer wall of the water pipeline, and the tail end of the glass fiber felt is overlapped with the starting end above the water pipeline. And then heating by adopting ultraviolet light to preliminarily cure the felt cylinder. Folding the half sleeve ladder 3 outside the felt cylinder, and welding a groove 31 on the half sleeve ladder 3 through electric welding. And standing until the secondary complete curing meets the strength requirement, and mounting a gate valve and a hole drilling machine to perform the next operation on the water pipeline.

Wherein Table 1.1 is the performance requirements of the felt after the felt has been completely cured

The glass fiber mat 1 of the present application is a glass fiber mat containing woven and co-woven glass fibers, capable of carrying resin condensate and withstanding installation pressure. The resin condensate is a mixed solution of resin and the curing agent, and the resin has good miscibility with water and is compatible with the glass fiber felt cloth. The resin is typically a polyester resin, an epoxy resin or a vinyl ester resin. In addition, a cobalt-containing compound or an organic peroxide may be added as a catalyst to the resin condensate to shorten the curing time.

Compare in prior art, the beneficial effect of this application lies in:

(1) the resin condensate has good miscibility with water, the slurry is automatically dispersed and emulsified after meeting water, and immediately carries out polymerization reaction, the curing time can be adjusted through the proportion, the induced curing time (namely, the mixed liquid of the resin and the curing agent is subjected to polymerization reaction under the climatic conditions of certain temperature, humidity and the like according to different proportions, and the curing time is long) is 30-120 min, the controllability is strong, the cement is originally adopted for curing and maintaining, at least several days are needed, the next step of working procedure can be carried out in time, and the construction period is greatly reduced.

(2) The resin is solidified to carry out polymerization reaction to form a high molecular compound, the material strength is high, the glass fiber felt cloth soaked by the resin can bear the internal water pressure of up to 1.0MPa after being solidified, and the glass fiber felt cloth is durable and practical, has the advantages of corrosion resistance and wear resistance, and can prevent the problem of pipeline leakage. In the prior art, hemp threads are filled between the half sleeve ladder and the water pipeline and then the half sleeve ladder is filled with asbestos cement to fill the space, so that water leakage is easy to occur.

(3) The epoxy resin material that this application adopted can reach the food level, does not worry the pollution to water supply pipe quality of water. However, in the prior art, the tiny asbestos fiber is easy to permeate into the pipeline, and when the asbestos is inhaled into the lung of a human body, lung diseases such as lung cancer are easily induced after the 20-40 year latent period.

(4) The application scope is wide, is suitable for the water pipeline of standard pipe diameter and nonstandard pipe diameter, easy operation.

The above-described embodiments are merely illustrative of the present invention and are not intended to limit the scope of the present invention. All equivalent changes and modifications of the invention that may occur to those skilled in the art are intended to be covered by the appended claims.

Claims

1. A sealing method for a water pipeline without water cut is characterized by comprising the following steps:

① soaking the cut glass fiber felt cloth with resin condensate;

② winding the glass fiber felt coated with the resin condensate and tightly attaching the glass fiber felt to the outer wall of the water pipeline to form a felt cylinder;

③ heating with ultraviolet light to make the felt cylinder solidify preliminarily;

④ folding the half sleeve ladder outside the felt cylinder and welding the groove on the half sleeve ladder;

⑤ standing, and installing a gate valve and a hole opener to perform the next operation on the water pipeline after the secondary complete solidification is completed.

2. The method as claimed in claim 1, wherein the length of the cut glass fiber felt is about 3.5 times of the outer diameter of the pipeline, and the width of the cut glass fiber felt is the same as the length of the half casing ladder.

3. A sealing method for a water pipe without water break as claimed in claim 1 or 2, wherein said glass fiber felt is a glass fiber mat comprising woven and mixed woven glass fibers.

4. The method as claimed in claim 1, wherein the resin condensate is a mixture of a resin having good miscibility with water and being compatible with the glass fiber mat and the curing agent.

5. A method of sealing a water pipeline without breaking a water ladder as claimed in claim 4, wherein said resin is polyester resin, epoxy resin or vinyl ester resin.

6. A method as claimed in claim 5, wherein a cobalt-containing compound or an organic peroxide is added as a catalyst to the resin condensate.

7. The method as claimed in claim 1, wherein the glass fiber felt is closely attached to an outer wall of the water passage pipe, and a tip end of the glass fiber felt overlaps the starting end above the water passage pipe.