JPH03255297A - Reinforcement of existing pipe - Google Patents

Abstract

PURPOSE:To reinforce an existing pipe without cutting the pipe by using a rubber elastic tape, a split cover member, and a member for connecting the split cover members, winding the tape round an existing pipe, covering a split cover member and connecting and holding the same by a connecting member. CONSTITUTION:In the reinforcement of a specified portion of an existing pipe 4 using a tape 1, a split cover member 2 and a connecting member, the tape 1 is formed by rubber elastic body and wound round a reinforced portion 4a of the existing pipe 4 from outside. The split cover member 2 comprises a pair of half cover members 20 respectively having a semi-cylindrical portion 40, and is adapted to cover the existing pipe 4 from above the tape 1. The connecting member 3 is shaped according to the chain portion 20a, 20b of the split cover member 2 and is adapted to engage with the chain portions to connect and hold the split cover member 2. Accordingly, the reinforcing and repairing work can be easily conducted without cutting the pipe.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a construction method for reinforcing or repairing a predetermined portion of an existing water supply pipe or the like.

[Conventional technology]

For example, water is supplied to each household through water pipes branched from main water pipes buried in roads and the like. In that case, a polyvinyl chloride pipe (hereinafter referred to as a PVC pipe) is used as the water supply pipe, and a stop valve for each household is usually provided downstream of the pipe. These stop valves (sometimes part of the water pipe)
Not only in the case of damage or breakdown, but also in other cases, replacement or repair is performed as necessary. You will need to water it. When it becomes necessary to shut off the water, conventionally, as shown in FIG. The water was stopped by crimping the area B1 with the crimping machine C, and the water stop valve was replaced in this state. At that time, when a water supply pipe made of PVC pipe is crimped as described above, the crimped part B will buckle, which may cause damage to the pipe opening when working at low temperatures or on old pipes. Even if such damage does not occur, buckling significantly reduces the strength, so it is necessary to reinforce the buckled portion. Therefore, in the past, in order to reinforce the buckling portion B1, a cylindrical tube was constructed, in which both ends were used as water supply pipe connections, and cap nuts D, D, D, etc. for fastening were attached to the connection parts, respectively. A reinforcing joint was attached to the buckled portion B1.

[Problem to be solved by the invention]

However, in the conventional reinforcing method as described above, when attaching the reinforcing joint to the buckled part B of the water supply pipe B, the buckling part C is first crimped to insert the joint into the water supply pipe B. the downstream pipe section B2 of section B,) must be cut;
Moreover, after installing the reinforcing joint, it is necessary to separately repair the cut water supply pipe portion B2. Therefore, in the past, reinforcement work for this type of water supply pipe required relatively much effort, and relatively wide trenches had to be excavated along the water supply pipe in order to carry out cutting and repair work as described above. There were problems such as having to work in small spaces, and further problems such as being unable to work in narrow spaces. In addition, instead of stopping the water by crimping as described above, a technique is sometimes used that freezes the area where the water should be stopped, but this technique is used because it will not freeze if there is even a small amount of water flowing inside the pipe. There are problems in that the scope is limited and a qualification to handle high-pressure gas for freezing is required. The present invention addresses the above-mentioned problems regarding reinforcing existing pipes, and aims to provide a method for reinforcing existing pipes that can easily reinforce or repair required portions of existing pipes without cutting the pipes. purpose.

[Means to solve the problem]

In order to achieve the above object, the existing pipe reinforcement method of the present invention is characterized by being configured as follows. That is, when reinforcing a predetermined portion of an existing pipe, a tape made of a rubber-like elastic material, a split cover member that can be split along the axial direction, and the split cover members are joined together and fastened.
First, the tape is wrapped or adhered to a predetermined portion of the existing pipe using a fastening member to hold the pipe, and then a predetermined portion of the existing pipe is covered with a split cover member from above the tape to form a mating state. After that, the combined divided cover members are fastened and held by the fastening member.

[For production]

According to the above configuration, since the split cover member is splittable along the axial direction, the tape made of rubber-like elastic material is wrapped or bonded around the predetermined portion of the existing pipe to be reinforced, and then the tape is The predetermined portion can be easily covered from above, that is, from the outside, by being sandwiched between the divided cover members. Then, in this state, by fastening the split cover member or the fastening member, a predetermined portion of the existing pipe is reinforced by the cover member covered from the outside. In this case, since the tape made of the rubber-like elastic body interposed between the split cover member and the existing pipe functions as a packing, the space between the split cover member and the existing pipe is reliably sealed. This allows reinforcement and repair of existing pipes without having to cut them.

【Example】

The present invention will be explained in detail below. In this embodiment, a tape 1 as shown in FIG. 1, a divided cover member 2 as shown in FIG. 2, and a fastening member 3 for the cover member as shown in FIG. 3 are used. The tape 1 is made of a rubber-like elastic body,
It can be wrapped or bonded from the outside around a portion 4a of the existing pipe 4 to be reinforced (for example, a crimped/restored portion; hereinafter referred to as the reinforced portion). Further, the divided cover member 2 is constituted by a pair of half-split cover members 20 and 20, each having a semi-cylindrical portion 20a. These half-split cover members 20.20 are provided with tapered flanges 20b, 20b on the outside of semi-cylindrical portions 20a, 20a along the axial direction, and one of the flanges 20b. This surface is a mating surface 20b1, and the other surface is an inclined surface 20b2 that is inclined in the axial direction with respect to the mating surface 20b1. When the mating surfaces 20b of these half-split cover members 20.20 are aligned with each other, the existing pipe 4
A cylindrical portion having an inner diameter slightly larger than an outer diameter is formed. On the other hand, the fastening member 3 has a groove 3a corresponding to the shape of the flange portions 20b, 20b of the split cover member 2 in a mated state.
It has a configuration in which the cylindrical part is formed in the longitudinal direction. This groove 3a has a pair of surfaces 3b and 3c facing each other in the groove width direction.
are inclined in opposite directions, so that the groove width becomes wider from one end to the other end. When the wide end of the groove is inserted from a predetermined direction into the flanges 20b, 20b in the mated state and slid in the longitudinal direction, the fastening member 3 is inserted into the flanges 20b, 20b.
The split cover member 2 can be tightened and held in the mating direction by engaging with the split cover member 2 (see FIGS. 4 to 6). Incidentally, on the nursery school side, the inclined surface 20b2 of the flange 20b and the pair of surfaces 3b and 3c forming the groove 3a of the fastening member 3 are made smooth, but may be changed as necessary. For example, small wavy irregularities may be formed on the surface. In this way, loosening of the fastening member 3 attached to the collar portions 20b, 20b in the mated state can be reliably prevented. Moreover, as shown in FIGS. 8 and 9, the cover member 2
By providing a groove 20d120d between the inclined surface 20b of the collar portion 20b and the semi-cylindrical portion 20a, and providing grooves 3d and 3d adjacent to the corresponding inclined surfaces 3b and 3c of the fastening member 3, If the fastening member 3 comes off from the flange 20b<
<It's okay to do that. Therefore, in the construction method of the present invention using the above-mentioned members, first, the tape I is wrapped or adhered to the reinforced portion 4a of the existing pipe 4, as shown in FIG. Then,
By sandwiching the part to which the tape 1 is attached between the semi-cylindrical parts 20a, 20a of the pair of half-split cover members 20.20, and aligning them with each other, the fourth
As shown in the figure, the reinforced portion 4a of the existing pipe 4 is covered with the split cover member 2 from the outside of the tape 1. At this time, a packing material may be interposed between the mating portions of the half-split cover members 20 and 20, if necessary. Next, the flange 2 of the divided cover member 2 in the mated state is
By inserting the fastening member 3 into the grooves 0b and 20b from the wide end side of the groove and sliding it in the engagement direction shown by the arrow a in FIG. 4 and tightening it, the split cover member 2 is closed as shown in FIG. are held in a predetermined alignment. According to the above configuration, the split cover member 2 is composed of a pair of half-split cover members 20.20 divided along the axial direction, and the half-split cover members 20.20 can be easily connected by the fastening member 3. Since the tape 1 made of a rubber-like elastic material is wrapped or adhered to the reinforcing portion 4a of the existing pipe 4, the divided cover member 2 can be fastened and held in the aligned state from the outside of the tape portion. The divided cover members 2 can be easily attached to each other, and the fastening members 3 can securely fasten and hold the split cover members 2 in the mated state so that they do not separate. In this case, even if the split cover 2 is tightened relatively strongly with the fastening member 3, the existing pipe 4 will not be damaged because the tape 1 acts as a resilient packing. In this way, the reinforced portion 4a of the existing pipe 4 is covered with the split cover member 2 from the outside via the tape 1, and is reinforced by the tape 1 and the split cover member 2. . In addition, after reinforcing in this way, the split cover member 2
By functioning as a sealing material, the tape 1 interposed between the reinforced part 4a and the split cover member 2 and the existing pipe 4
This ensures that there is no water leakage at this reinforced part. Furthermore, especially in this embodiment, as a means for fastening and holding the divided cover members 2 in the mated state, a structure is adopted in which the ends of the fastening members 3 are inserted and slid into the flanges 20b, 20b of the cover members 2. Therefore, the divided cover member 2 can be fastened extremely easily compared to the case where ordinary fastening means such as bolts are used, and this kind of fastening work can be performed without using tools such as bolt tightening tools. I can do it. Incidentally, instead of the divided cover member 2 shown in FIG. 2, a divided cover member 2' as shown in FIG. 7 may be used. This split cover member 2' includes a pair of half-split cover members 20
One side of '20' is connected to each other by a pivot pin 21', and both halves of the cover member 20 are connected around the pin 21'.
It has a configuration that allows '20' to be opened on both sides. In this case, on the ward side, the side 2 located on the opposite side of the pivot pin 21'
0b' and fastened with bolts 22', it goes without saying that the same structure as the flange 20b shown in FIG. 2 may be adopted for the side part 20b'.

【Effect of the invention】

As described above, according to the reinforcing method for existing pipes of the present invention, when repairing the part to be reinforced such as the crimped/restored part of the existing pipe, the part to be reinforced can be easily reinforced and repaired without cutting the pipe. I can do it. This not only makes it possible to perform reinforcement and repair work on existing pipes even in relatively narrow spaces, but also greatly improves the workability of this type of reinforcement work.

[Brief explanation of drawings]

Figures 1 to 6 show an embodiment of the present invention. Figure 1 is a front view showing the state in which the tape used in the embodiment is wrapped around an existing pipe, and Figure 2 is a state in which the split cover member is separated. 3 is a perspective view of the fastening member, FIG. 4 is a front view showing the state in which the fastening member is attached to the flange of the split cover member, and FIG. 5 is a side view showing the state in which the split cover member is fastened. , and FIG. 6 is a cross-sectional view taken along the line ■--■ in FIG. Also,
FIG. 7 is a side view showing a split cover member used in another embodiment of the present invention, and FIGS. 8 and 9 respectively show a split cover member and a fastening member used in still another embodiment of the present invention. FIG. Moreover, FIG. 10 is a front view showing an example of a conventional reinforcement method using a reinforcement joint. DESCRIPTION OF SYMBOLS 1... Tape, 2... Divided cover member, 3... Fastening member, 4... Existing pipe.

Claims (1)

[Claims] (1) When reinforcing a predetermined portion of an existing pipe, the tape made of rubber-like elastic material, the split cover member that can be split along the axial direction, and the split cover member are fastened together.
First, the tape is wrapped or adhered to a predetermined portion of the existing pipe using a fastening member to hold the pipe, and then a predetermined portion of the existing pipe is covered with a split cover member from above the tape to form a mating state. A reinforcing construction method for an existing pipe, characterized in that the divided cover members in the combined state are then fastened and held by the fastening member.