LU505275B1 - A REPAIR STRUCTURE AND A REPAIR METHOD FOR A GLASS FIBER REINFORCED PLASTIC PIPE - Google Patents

Abstract

The present invention discloses a repair structure for a glass fiber reinforced plastic pipe, comprising a pipe having a damaged part having a repair opening formed by cutting, and an inner reinforcing steel plate is provided on the inner wall of the pipe, and an outer reinforcing steel plate is provided on the outer wall of the pipe. An outer reinforcing steel plate is provided on the outer wall of the pipe, the inner reinforcing steel plate and the outer reinforcing steel plate are fixed to the pipe from both the inside and outside of the repair opening and bolted to the wall of the pipe to cover the repair opening, and a high polymer anti-seepage layer is provided between the inner reinforcing steel plate and the outer reinforcing steel plate, the high polymer anti-seepage layer closing the repair opening. The present invention also discloses a pipe repair method. Advantageous effects of the present invention: the repair structure has high strength and a low rate of secondary fracture; the toughness and seepage prevention performance of the polymer anti-seepage layer is good, and the seepage pressure can reach 1.0MPa, which meets the requirements of pipeline sealing; the use of local repair, which avoids the replacement of the entire damaged section of the pipe, for buried pipelines only need to be excavated locally near the damaged part, short construction period, fast construction speed.

Description

A repair structure and a repair method for a glass fiber reinforced LU505275

Plastic piping

Technical part

The present invention belongs to the technical field of underground pipeline maintenance and particularly relates to a repair structure and a

Repair procedure for a glass fiber reinforced plastic pipeline.

Technology in the background

FRP generally refers to the glass fiber or its products as

Reinforcing material reinforced plastic, known as glass fiber reinforced plastic, or known as FRP, specific light and hard, high mechanical strength,

Corrosion resistance and other advantages. Pipes made of glass fibre reinforced plastic as

Material are called GRP pipes, in addition to the inherent advantages of GRP

Materials, GRP pipes also have a smooth surface, low energy consumption for transportation, long life and many other advantages that have been recognized in recent years in

are widely used in municipal pipe networks and technical drainage structures.

GRP pipes are a rigid material, when subjected to impact or soil stress changes, local damage may occur, such as local fractures, cracks, etc., of which cracks are the most common.

If the GRP pipe is broken, the existing repair method is to replace the entire

section of the broken pipe and then lift the new pipe for replacement.

If the pipe is buried in the ground, the road surface must also be dug up to expose the entire damaged pipe. The disadvantages of this method are: even smaller damaged pipes are scrapped, new pipes must be laid, the labor required for excavation, the need to use large lifting machines, long

working hours, high costs and major ground disturbances. Therefore, there is an urgent need to

To solve the problem of difficult repair of damaged underground pipelines.

Content of the invention

Against this background, it is an object of the present invention to provide a structure for

Repair of a glass fibre reinforced plastic pipe.

The technical solution is as follows:

A repair structure for a glass fiber reinforced plastic pipe comprising a pipe having a damaged portion, the pipe having a repair opening which is cut and formed, the key being that the pipe is provided with an inner

Reinforcing steel plate is provided on the inner wall of the pipe, wherein the pipe is provided with an outer reinforcing steel plate on the outer wall of the pipe, wherein the inner

Reinforcing steel plate and outer reinforcing steel plate are fixed to the pipe from the inside and outside of the repair opening respectively and are bolted to the wall of the pipe to cover the repair opening;

The inner reinforcing steel plate and the outer reinforcing steel plate are provided with a polymer anti-seepage layer between them, and the polymer anti-seepage layer seals the repair opening.

A preferred technical solution is that the edges of the inner and outer reinforcing steel plates extend 15 to 25 cm beyond the boundary of the repair opening.

In a preferred technical solution, the inner and outer

Reinforcing steel plate curved plates adapted to the local pipe wall in which the repair opening is located.

The aim of the present invention No. 2 is to provide a method for repairing a glass fiber reinforced plastic pipe. The technical solution is as follows:

A method for repairing a glass fiber reinforced plastic pipe repaired as described above is characterized in that it is carried out in the following steps:

Step 1, Determine an approximate location of a damaged part of the pipe and

Carrying out a pipe cleaning at the site to determine the location and size of the damaged part of the pipe;

Step 2, Remove the wall of the pipe containing the damaged part to

To form a repair opening depending on the size of the damaged part;

Step 3, Sealing the repair opening from the inside by laminating and fixing the inner reinforcing steel plate to the inner wall of the pipe;

Step 4, spraying polymer at the site of the repair opening to form the polymer impermeable layer;

Step 5, Laminating and fixing the outer reinforcing steel plate to the outer wall of the pipe, covering the polymer impermeable layer from the outside.

A preferred technical solution is that both the inner and outer

Reinforcing steel plate must be screwed to the wall of the pipe.

In a preferred technical solution, in step 2 the damaged part is repaired with a

Cut out a boundary of 20 cm around the damaged part.

In a preferred technical solution, the damage form of the above-mentioned damaged part is a partial defect or a crack extending axially along the pipeline.

Compared with the existing technology, the beneficial effect of the present

Invention: the repair structure has high strength and low secondary fracture rate; the

Toughness and seepage resistance of the polymer anti-seepage layer is good, and the

Leachate pressure can reach 1.0 MPa, which meets the requirements for sealing the

Pipeline fulfilled; The use of local repair, which involves the replacement of the entire damaged

section of the pipeline, for buried pipelines only need to partially excavate near the damaged part, the project time is short, and the construction speed is fast.

Description of the attached drawings

Figure 1 shows a schematic representation of the repaired pipe;

Figure 2 is a schematic representation of the repaired structure with a view of the

cross-section of the pipe;

Figure 3 is a schematic representation of the damaged part of the GRP pipe, showing the

Cutting area and repair area are shown by dashed lines;

Figure 4 shows a schematic diagram of cutting to form a repair opening;

Figure 5 is a schematic representation of the repair opening after spraying the

Polymers to form a polymer-impermeable layer.

Detailed description

The present invention is described in more detail below in conjunction with embodiments and the accompanying drawings.

Embodiment 1

As shown in Figures 1 and 2, a repair structure for a glass fiber reinforcedb4/905275

Plastic pipe (FRP pipe) a pipe 1 with a cut out and formed

Repair opening 3, wherein the pipe 1 is provided with an inner reinforcing steel plate 6 at the

inner wall of the pipe 1 and with an outer reinforcing steel plate 4 on the outer wall of the

pipe 1. The inner reinforcing steel plate 6 and the outer reinforcing steel plate 4 are both curved plates adapted to fit into the local pipe wall of the

Repair opening 3. The inner reinforcing steel plate 6 and the outer

Reinforcing steel plate 4 are both from the inside and outside of the

Repair opening 3 is attached to the pipe 1 and screwed to the wall of the pipe to

Repair opening 3. The inner reinforcing steel plate 6 and the outer

Reinforcing steel plate 4 are provided with a polymeric impermeable layer 5 between them, which closes the repair opening 3. The edges of the inner reinforcing steel plate 6 and the outer reinforcing steel plate 4 extend 15 to 25 cm, preferably 20 cm, beyond the

Limits of repair opening 3.

After testing, the strength of the above repair structure is close to the

Strength of the wall body of the FRP pipe, and the seepage pressure can reach 1.0 MPa.

Embodiment 2

Method for repairing a glass fibre reinforced plastic pipe, applicable to a damaged part 2, in which the damage is in the form of a localised defect or a

crack extending axially along the pipe 1. The repair procedure is carried out in the following steps:

Step 1, Based on the leakage condition, a preliminary judgment is made to determine the approximate location of the damaged part 2 of the pipe 1, and the pipe is cleaned at this location to determine the location and size of the damaged part 2 of the

pipe 1 as shown in Figure 3;

Step 2, according to the size of the damaged part 2, cutting out the wall of the

pipe containing the damaged part 2, with a limit of 20 cm around the damaged part 2 for cutting out to form the repair opening 3, as shown in Figure 4;

Step 3, fixing the inner reinforcing steel plate 6 to the inner wall of the pipe 1 in a fit, closing the repair opening 3 from the inside;

Step 4, spraying a polymer onto the site of the repair opening 3 to form the polymer impermeable layer 5, as shown in Figure 5;

Step 5, fastening and fixing the outer reinforcing steel plate 4 to the outer wall of the pipe 1, covering the polymer impermeable layer 5 from the outside, the inner

Reinforcing steel plate 6 and the outer reinforcing steel plate 4 are aligned, both being bolted to the wall of the pipe 1, the bolts being circumferentially along the

Edges of the inner reinforcing steel plate 6 and the outer reinforcing steel plate 4 are distributed.

Finally, it should be noted that the above description is only a preferred

Embodiment of the present invention, and a person of ordinary skill in the art may make a variety of similar representations under the inspiration of the present invention and without violating the purposes and claims of the present

invention, and such transformations all fall within the scope of the present invention.

Claims (7)

Claims LU505275 1. A repair structure of a glass fiber reinforced plastic pipe comprising a pipe (1) in which a repair opening (3) is cut and formed, characterized in that: the pipe (1) is provided with an inner reinforcing steel plate (6) on the inner wall, and the pipe (1) is provided with an outer reinforcing steel plate (4) on the outer wall. The inner reinforcing steel plate (6) and the outer reinforcing steel plate (4) are attached to the pipe (1) from the inside and outside of the repair opening (3) respectively and bolted to the wall of the pipe to cover the repair opening (3); the inner reinforcing steel plate (6) and the outer reinforcing steel plate (4) are provided with a polymeric impermeable layer (5) between them, the polymeric impermeable layer (5) closing the repair opening (3). 2. A repair structure of a glass fiber reinforced plastic pipe according to claim 1, characterized in that the edges of the inner reinforcing steel plate (6) and the outer reinforcing steel plate (4) extend 15 to 25 cm beyond the boundary of the repair opening (3). 3. A repair structure of a FRP pipe according to claim 1 or 2, characterized in that: the inner reinforcing steel plate (6) and the outer reinforcing steel plate (4) are curved plates adapted to the local pipe wall where the repair opening (3) is located. 4. A method for repairing a glass fiber reinforced plastic pipe, the repair forming a repair structure according to any one of claims 1 to 3, characterized in that it is carried out in the following steps: step 1, determining the approximate location of the damaged part (2) of the pipe (1) and performing a pipe cleaning at this location to determine the location and size of the damaged part (2) of the pipe (1); step 2, according to the size of the damaged part (2), removing the wall of the pipe containing the damaged part (2) to form the repair opening (3); step 3, fixing the inner reinforcing steel plate (6) to the inner wall of the pipe (1), closing the repair opening (3) from the inside; step 4, spraying polymer onto the position of the repair opening (3) to form the polymer impermeable layer (5); Step 5, Fixing the outer reinforcing steel plate (4) to the outer wall of the pipe (1), covering the polymer impermeable layer (5) from the outside. 5. A method of repairing a GRP pipe according to claim 4, characterized in that: the inner reinforcing steel plate (6) and the outer reinforcing steel plate (4) are both bolted to the wall of the pipe (1). 6. A method for repairing a glass fiber reinforced plastic pipe according to claim 4, characterized in that in step 2 the damaged part (2) is cut out with a boundary of 20 cm around the damaged part (2). 7. A method for repairing a GRP pipe according to claim 4, characterized in that the damaged part (2) is in the form of a partial defect or a crack extending axially along the pipe (1).