JPH10299959A - Earthquake resistant piping joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cushion external force at the time of an earthquake and prevent the damage of a pipe joint part by fitting both end parts of an expansion joint pipe between the respective joint end parts of relative piping, and fittingly inserting and fastening the end part of a prestressing bar wound around a piping end part, to a bearing plate block disposed at the end part outer periphery of the expansion joint pipe. SOLUTION: A resin adhesive 6 is applied to the outer peripheral surface of the respective joint end parts of relative piping 1, 1, and both end parts of expansion joint pipe 2 of bellows shape are fitted thereto. Bearing plate blocks 3 are arranged and bonded to the end part outer peripheral surface of the expansion joint pipe 2, and both end linear parts of a prestressing bar 4 wound around the end part of the expansion joint pipe 2 are passed through the bearing plate block 3. A nut 5 is thread- fastened to the end part thread part of the prestressing bar 4 and tightened to lead in prestress and to fasten the expansion joint pipe 2 to the piping 1. Looseness after execution of work is prevented, and external force is absorbed by the deforming ability of the expansion joint pipe 2 to bending moment in an optional direction and axial force acting upon a piping structure at the time of an earthquake or the like so as to prevent the damage of the piping 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earthquake-resistant piping joint used for underground and above-ground piping such as gas, water, oil, drainage, and the like.

[0002]

2. Description of the Related Art In conventional pipe joints of this type, pipes to be joined are joined by flange joints.

[0003]

As described above, since the conventional pipe joint is rigidly connected by the flange joint, an excessive strain and force are generated in the joint part during an earthquake, and there is a fear that the pipe may be damaged. The present invention has been proposed in view of the problems of the prior art described above, and an object of the present invention is to provide an earthquake-resistant pipe joint that buffers external force during an earthquake and prevents damage to the pipe joint. .

[0004]

In order to achieve the above object, an anti-seismic pipe joint according to the present invention is provided by applying an adhesive to the outer peripheral surface of each joint end of the opposing pipe to form a V-shaped pipe in the longitudinal direction. Along with fitting both ends of the expansion joint pipe in which the folds of the cross section are connected, a supporting plate block is arranged on the outer periphery of the expansion joint pipe,
Tightening PC wound around the pipe end on the supporting block
It is configured by inserting and fastening the ends of steel bars to introduce prestress.

[0005]

BRIEF DESCRIPTION OF THE DRAWINGS The invention will now be described with reference to the drawings, which illustrate a preferred embodiment of the invention. Reference numeral 1 denotes a pair of opposed pipes, each of which is coated with a resin adhesive 6 on the outer peripheral surface of each joint end of the pipe 1 and has a bellows-like shape in which a fold having a V-shaped cross section is formed in the longitudinal direction and is continuously provided. A support plate block 3 in which both ends of an expansion joint pipe 2 are fitted, and an inner peripheral surface of the expansion joint pipe 2 is formed in an arc shape having the same curvature as the pipe 1.
Are placed and adhered, and the straight ends of both ends of the PC steel rod 4 wound around the end of the joint pipe 2 penetrate the support plate block 3, and the nut 5 is screwed into the end thread part of the PC steel rod 4. The expansion joint pipe 2 is fastened to the pipe 1 by screwing and tightening to introduce prestress.

Therefore, the joint portion of the pipe 1 is not loosened after the installation 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 joint pipe, d is the outer diameter of the pipe to be joined,
GP is the gap between the joint pipe and the pipe to be joined before tightening, which is the minimum value necessary for insertion of the joint pipe. Since the illustrated example is configured as described above, the width of the V-shaped cross-section fold in the expansion joint pipe 2 is reduced with respect to the compressive force acting on the pipe joint, and the tensile force is reduced with respect to the tensile force. By expanding the width of the fold, the compressive force is absorbed by expansion and contraction of the expansion joint tube 2.

With respect to the bending moment acting on the pipe joint, the width of the V-shaped cross-section on the tension side of the joint pipe 2 expands, and the width of the V-shaped cross-section on the compression side increases. Is contracted, the edge stress of the bending moment is absorbed. At this time, by making the pipe made of stainless steel, utilizing the characteristics of the stainless steel, it is excellent in the draw adaptability for tightly joining the tightening joint and the corrosion resistance as the joint.

If the pipe needs to be replaced, the nut 5
The intended purpose can be easily achieved by removing the pipe joint part of the pipe 1 and the expansion joint pipe 2 by loosening.
Further, the pipe joint structure is applied to underground and above-ground pipes such as gas, water, oil, drainage, etc., is also applied to a curved joint, and can be used as an expansion joint of a pipe structure.

[0009]

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 opposing pipe,
Increases the adhesion between the pipe and the joint pipe, prevents leakage of substances in the pipe, fits both ends of an expansion joint pipe in which V-shaped cross-section folds are arranged in the longitudinal direction, and A supporting block is arranged on the outer circumference of the pipe, and the end of the PC steel rod wound around the end of the joint pipe is inserted and fastened to each supporting block to introduce a prestress, thereby causing an earthquake. At this time, the external force is absorbed by the deformation capability of the expansion joint pipe having the V-shaped cross-section folds against the axial force acting on the pipe structure and the bending moment in an arbitrary direction, thereby preventing damage to the pipe. .

[0010] Even when the pipe needs to be replaced, it can be easily replaced by removing the joint.
Furthermore, since the joint portion is prestressed through a PC steel bar and the expansion joint tube is fastened to the end of the pipe, the joint portion does not loosen after construction.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of an earthquake-resistant piping joint according to 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)

[Claims] An adhesive is applied to the outer peripheral surface of each joint end of the opposed pipes, and both ends of an expansion joint pipe having V-shaped cross-section folds connected in the longitudinal direction are fitted together, A support plate block is arranged on the outer periphery of the expansion joint pipe, and the end of the tightening PC steel rod wound around the pipe end is inserted and fastened to the support block to introduce prestress. A seismic piping joint characterized by the following: