JPS5854316B2 - Synthetic resin branch joint for buried piping - Google Patents

Description

Detailed Description of the Invention The present invention provides a resin tube in which a synthetic resin material is used alone or in the inner or outer layer, or a layer consisting of a resin material and a fiber material as a reinforced plastic layer alone or in combination with other fillers. This relates to the configuration of branch pipes that are stacked on top of each other and are applied to buried pipes.

Conventionally, resin pipes as described above have been used as sewage pipes, drainage pipes for agricultural chemicals, or buried pipes in the chemical industry.

In addition, branch pipes are formed in these buried pipes, or pipes using branch pipe joints are used, but these resin pipes are more flexible than iron pipes or concrete pipes.

Therefore, deflection occurs due to earth pressure and pressure from passing vehicles, and in particular, in branch pipes, this deflection becomes concentrated at the root of the branch as deformation pressure such as tension or compression force, which often causes breakage.

Therefore, it was necessary to construct a special reinforcing means featuring only branch pipes.

However, branch parts made of steel plates are not only expensive, but even when coated with a corrosion-resistant material, they are still inferior to those made of resin, making it impossible to obtain sufficient corrosion resistance for the pipe as a whole.

Therefore, it is desired that the branch pipe portion be made of the same material as the other pipe materials constituting the pipe line, and that it also have the strength to withstand the external pressures described above.

To satisfy these requirements, the thickness of the root attachment part of the branch pipe is made thicker than the thickness of the other pipe bodies, or the branch part is covered with reinforcing material from the outer periphery. However, the former is a means of reinforcing only the base of the branch pipe, and the deformation pressure as described above is concentrated in the weak part, and the reinforcing means is used to reinforce the straight pipe part rather than the base of the branch pipe. The border is more likely to be damaged.

Therefore, reinforcement to increase the wall thickness must be applied to the circumferential surface of the branch portion of the branch pipe, which inevitably becomes expensive.

In addition, the latter method of embedding reinforcing bars can only be used in branch pipes molded with reinforced plastic layers, and the processing is labor-intensive and expensive.

The present invention has been made with attention to these points, and its gist is to cover the peripheral part of the branch part thickly with a layer of mortar to integrally reinforce it, and to strengthen the outer edge of the joint between the reinforcing mortar material and the pipe body. In each case, an elastic material is arranged to buffer the bending and prevent damage.

The present invention will be explained below based on the drawings, which illustrate a T-shaped pipe in which the branch pipe is branched from a straight pipe in a direction perpendicular to g.
The following explanation will be made regarding a T-shaped tube, but it can be similarly applied to branched tubes such as a Y-shaped tube and a cross tube.

FIG. 1 is a side view partially cut away to explain the structure and deflection of a conventional branch pipe. The figure shows a composite tube made up of .

That is, the branch pipe 1 is composed of a straight pipe part 2 and a branch pipe part 8 integrally formed therein. The branch joint pipe forming the port 5 will be described.

In some cases, the straight pipe part 2 and the branch pipe part 3 are integrally formed in the branch pipe, but the straight pipe part 2 and the branch pipe part 3 are sometimes formed integrally. 1, and the present invention is particularly suitable for reinforcing this joint to form a branch pipe.

In Fig. 1, when external pressure is applied to the branch pipe 1 as shown by the arrow A, the branch pipe part 3 has a resistance force in that direction, but the straight pipe part 2 is bent as shown by the dashed line B, and this tension is absorbed. As described above, this will act on the attachment base I of the branch pipe portion 8, resulting in damage.

In addition, generally, a reinforced plastic branch part has a uniform wall thickness throughout and is a flexible pipe, so the straight pipe part may be deformed by as much as 5% due to the above-mentioned earth pressure or vehicle passing pressure.

However, the attachment base T of the branch pipe portion 3 cannot follow these deformations and is damaged.

In order to prevent these problems, an attempt has been made to reinforce the peripheral part of the branch part 1 with a mortar material 8 such as resin mortar or concrete, as shown in FIG.

That is, a split mold was used, the above-mentioned filler was applied, and reinforcing reinforcing bars 9 were buried as necessary to form a mortar layer.

In this attempt, the root part 7 of the branch pipe 3 and the vicinity of both sides of the straight pipe part 2 are firmly fixed together with mortar material 8 to reduce flexibility and prevent damage to the branch pipe attachment part as described above. This could be completely prevented, and by making the wall thickness of the branch pipe part 3 and the straight pipe part 2 the same, it could be used without using a special thick part or reinforcing bar at the base of the branch pipe installation. On the other hand, the pipe bodies were sometimes damaged at the joints between the mortar material 8 and each pipe.

That is, the outer edge of the joint between the mortar material 8 and the pipe body, particularly the straight pipe part 2, shown at 10 in FIG. Joint outer edge 1
At 0, shear failure occurred.

The present invention has been studied to prevent such shear damage, and as described above, an elastic material is interposed at the outer edge of the joint between the reinforcing mortar material 8 and the pipe body. It is designed to disperse concentrated loads acting on the parts and provide flexibility to prevent shear damage.

The present invention will be described in detail below based on FIGS. 3, 4, and 5, which are shown as examples of the present invention.

FIG. 3 is a side view in which the present invention is applied to the T-tube shown in the above-described example, with a portion thereof being interrupted.

FIG. 4 is a sectional view taken along section line 4--4 in FIG. 3 in the direction of the arrow.

In these figures, 1L12 and 13 are elastic materials, and the elastic materials are made of rubber, synthetic resin, foamed polystyrene, or the like.

However, these elastic materials are used with a suitable thickness, but in the case of relatively dense materials such as rubber materials and synthetic resin materials, the thickness is 10 to 2.
0mrlL1 These sponge-like ones are 10-5
0 mountain was appropriate.

Furthermore, if these elastic materials are too long in the tube axis direction and reduce the bonding area between the fixed mortar material 8 and the branch pipe section 3, the reinforcing effect of the mortar material 8 will be reduced; If the amount buried in the fixed mortar material 8 is small, it will cause concentrated stress, and the determination of its length is also important.

Therefore, when we examined the axial length of the elastic material itself, it was 100 to 3001. was appropriate.

In addition, since these elastic materials are sometimes forced to be replaced, it is preferable to arrange them so as to protrude from the outer surface of the mortar material 8 as shown in the figure, and the length of the projection is 10 to 30 mm.
It is preferable that i<m.

It is preferable that these elastic materials be formed into a ring, but if it is difficult to fit them due to the socket forming part, etc., they can be held as a sheet material by wrapping it around a predetermined position with wire or by pasting it with adhesive. , mortar material 8 is applied.

In addition, although the elastic material is shown as having a rectangular cross section, it may be made of an elastic material that is thinner in the part located deep in the mortar material 8 and gradually thickens toward the exposed side, and this is preferable depending on the type of pipe. Sometimes.

In FIG. 5, a branch pipe section 3 is installed in a straight pipe section 2, and an adhesive layer 14 is formed on the installed section.

The branch pipe section 3 planted in this manner is more easily damaged than the branch pipe section 3 illustrated in FIG. 1, and is extremely vulnerable to external pressure as shown by arrow A.

Therefore, the present invention is particularly effective for branch parts that are simply joined in this way.

FIG. 6 is a view corresponding to the previous FIG. 3 in which the present invention is applied to the branch pipe section illustrated in FIG. Although it is used in the same manner as above, the one in which the branch pipe section 3 is implanted has less resistance to external pressure and internal pressure moving in the pulling direction and pushing direction than the one illustrated in FIG. 1 above.

Therefore, it may be desirable to provide means for tightly joining the eight layers of mortar material on the outer periphery of the branch pipe section 3 in which the present invention is used.

FIG. 6 shows one example of this, in which continuous or discontinuous protrusions 15 are formed on the outer circumferential surface of the mortar-embedded branch pipe portion 30.

These protrusions 15 may be integrally formed during molding of the branch pipe portion 3, or may be attached after molding, and of course may be mere protrusions.

In this way, the synthetic resin branch joint for buried piping of the present invention not only strengthens the straight pipe of the branch pipe and the surrounding area where the branch pipe is attached by thickly covering it with mortar material, but also strengthens the straight pipe of the branch pipe and the surrounding area where the branch pipe is attached. Since elastic cushioning material is placed on each outer edge of the joint, this branch is held extremely firmly.
Even if the pipe body undergoes bending deformation, the cushioning material buffers and disperses the shear and concentrated load at the boundary with the reinforcing mortar part, and acts to partially apply the bending of the pipe to the mortar material, thereby causing the pipe body to deform. Damage could have been prevented.

[Brief explanation of the drawing]

FIG. 1 is a side view illustrating a conventional branching section, with a part cut away. FIG. 2 is an improved explanatory diagram of FIG. 1, and is shown in the same manner as FIG. 1. 3 is a partially cutaway side view of the present invention applied to the one in FIG. Side view showing another example, No. 6
The figure is a diagram corresponding to FIG. 3 in which the present invention is applied to the one in FIG. 5. 1... Branch part, 2... Straight pipe part, 3...
...Branch pipe section, 4...Socket, 5...
・Inlet, 6... Connecting pipe, T... Mounting base, 8... Mortar material, 9... Reinforcing bar,
10... Joint outer edge, 11, 12, 13...
...Elastic material, 14...Adhesive layer, 15...
...Protrusions.

Claims (1)

[Claims] 1. In a synthetic resin branch joint for buried piping in which a branch pipe is formed in an appropriate direction relative to the straight pipe part, the straight pipe of the branch pipe and the area around the attachment of the branch pipe are covered with a mortar layer and reinforced integrally. A synthetic resin branch joint for buried piping, characterized in that an elastic material is arranged at each outer edge of the joint between the reinforcing mortar material and the pipe body.