JP3084657B2 - Seismic pipe fittings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to gas, water, oil,
The present invention relates to an earthquake-resistant piping joint applied to underground and above-ground piping for guiding drainage and the like.

[0002]

2. Description of the Related Art Conventionally, a pipe joint of this type is rigidly connected to a pipe to be connected by a flange.

[0003]

Conventionally, as described above, since a pipe joint is rigidly connected to a pipe to be connected by a flange, excessive strain and force are generated in the joint during an earthquake, and There was a risk of damage.

The present invention has been made in view of the above problems, and has as its object to provide an axial force acting on a piping structure during an earthquake or the like and a bending moment in an arbitrary direction to deform an expansion joint pipe. It is an object of the present invention to provide a seismic pipe joint which can prevent damage to the pipe, facilitate replacement of the pipe, and does not loosen the expansion joint pipe after being tightened to the pipe.

[0005]

In order to achieve the above-mentioned object, an earthquake-resistant pipe joint according to the present invention applies an adhesive to the outer peripheral surface of each joint end of the opposed pipes, and applies V to the longitudinal direction. A pleated shape in which a fold having a U-shaped cross section is bent and connected at both ends of a bellows-shaped expansion joint pipe, and an inner peripheral surface is formed on the outer peripheral surface of the expansion joint pipe in an arc shape having the same curvature as the pipe. A pressure plate block is arranged and bonded, and both ends of a PC steel rod wound around the end of the expansion joint pipe penetrate the support plate block,
A prestress is introduced by screwing and tightening a nut on the end thread portion of the PC steel rod.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an earthquake-resistant pipe joint according to the present invention will be described with reference to an embodiment shown in FIGS. Reference numeral 1 denotes a pair of opposed pipes, each of which is coated with a resin adhesive 6 on an outer peripheral surface of a joint end portion of each of the pipes 1 and has a bellows shape in which a V-shaped cross-section fold is formed in a longitudinal direction and is continuously provided. Both ends of the expansion joint pipe 2 are fitted together, and a support plate block 3 whose inner peripheral surface is formed in an arc shape having the same curvature as the pipe 1 is arranged and adhered to the outer peripheral surface of the expansion joint pipe 2. The straight portions at both ends of the PC steel rod 4 wound around the end of the joint pipe 2 penetrate the support plate block 3 and
A nut 5 is screwed and tightened on the end thread portion of the C steel rod 4 to introduce prestress, and the expansion joint pipe 2 is tightened to the pipe 1.

Therefore, the joint portion of the pipe 1 is not loosened after the construction by introducing the prestress with the PC steel rod 4. In the figure, L is the interval between the pipes 1 and 1, D is the inner diameter of the joint of the expansion joint pipe 2, d is the outer diameter of the pipe 1 to be joined, and GP is the joint with the expansion joint pipe 2 before tightening. Piping 1
The gap GP is a minimum value necessary for insertion of the expansion joint pipe 2.

Since the earthquake-resistant pipe joint of the present invention is configured as described above, the width of the V-shaped cross-section fold of the expansion joint pipe 2 is reduced with respect to the compressive force acting on the pipe joint. , And absorbs the tensile force by expanding the width of the V-shaped cross-section of the expansion joint tube 2. Further, with respect to the bending moment acting on the pipe joint, while the width of the V-shaped cross-section fold on the tension side of the expansion joint pipe 2 expands,
Absorption is achieved by reducing the width of the V-shaped cross-section fold on the compression side.

At this time, the pipe is made of stainless steel, so that the characteristics of the stainless steel are utilized to provide excellent draw adaptability for tightly joining the joints, and excellent corrosion resistance as a joint. When the pipe 1 needs to be replaced, the nut 5 is loosened and the expansion joint pipe 2 is removed from the pipe 1. The earthquake-resistant piping joint of the present invention is used for gas, water, oil,
It is applied to underground and above-ground piping that guides drainage and the like, but can also be used as expansion joints for pipe structures.

[0010]

According to the seismic pipe joint of the present invention, an adhesive is applied to the outer peripheral surface of each joint end of the pipes facing each other as described above, and a fold having a V-shaped cross section is formed and connected in the longitudinal direction. Since both ends of the bellows-shaped expansion joint pipe are fitted, the adhesion between the pipe and the expansion joint pipe can be increased, and leakage of the substance in the pipe can be prevented. In addition, on the outer peripheral surface of the expansion joint pipe, a supporting plate block having an inner peripheral surface formed in the shape of an arc having the same curvature as the pipe is arranged and adhered, and both ends of the PC steel rod wound on the end of the expansion joint pipe have straight portions. Into the supporting plate block, screw a nut on the end thread of the PC steel rod, tighten and tighten the prestress, and tighten the expansion joint pipe to the pipe. The acting axial force and bending moment in any direction can be absorbed by deformation of the expansion joint pipe,
Piping damage can be prevented.

[0011] When it is necessary to replace the piping,
The nut can be loosened and the expansion joint pipe can be removed from the pipe, so that the pipe can be easily replaced. In addition, as described above, a support plate block having an inner peripheral surface formed in an arc shape having the same curvature as the pipe is arranged on the outer peripheral surface of the expansion joint pipe, adhered thereto, and a PC steel rod wound around the end of the expansion joint pipe. The straight ends of both ends penetrated the support plate block, and nuts were screwed and tightened on the end threaded portions of the PC steel rod to introduce prestress, and the expansion joint pipe was tightened to the pipe. No loosening of the tube.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of an earthquake-resistant piping joint of the present invention.

FIG. 2 is a vertical sectional side view of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Piping 2 Expansion joint pipe 3 Support plate block 4 PC steel bar 5 Nut 6 Adhesive

Claims (1)

(57) [Claims] 1. An adhesive is applied to an outer peripheral surface of each joint end of a facing pipe, and a fold having a V-shaped cross-section is bent in a longitudinal direction, and both ends of a bellows-shaped expansion joint pipe connected to each other are fitted. A supporting plate block having an inner peripheral surface formed in an arc shape having the same curvature as that of the pipe is arranged and bonded to the outer peripheral surface of the expansion joint pipe, adhered, and a PC steel rod wound around an end of the expansion joint pipe. Characterized in that a prestress is introduced by penetrating the straight portions at both ends of the supporting plate block and screwing and tightening a nut to an end thread portion of the PC steel rod.