JP2002195460A - Coupler for connection - Google Patents

Abstract

PROBLEM TO BE SOLVED: To not only easily dismount a pipe buried in the ground connected to a connection part, but also use the pipe over a long period in an excellent state of preventing a deformation and damage, and further dispense with accu rate cutting of an end of the pipe buried in the ground. SOLUTION: A coupling for connection comprises: a fixed side cylindrical member 4 fixed in a state of being penetrated to a connection part 1; and a disengagement preventing cylindrical member 7 provided with a threaded engagement part 5 threadedly engaged and integrated with the pipe buried in the ground inserted into the fixed side cylindrical member 4, and an abut part 6 for preventing the disengaging of a pipe 3 buried in the ground by abutting to an end at the connection part of the fixed side cylindrical member 4 after thread engaging of the threaded engagement part 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting joint for connecting a spiral underground pipe in which convex portions and concave portions are alternately located in a pipe axis direction at a connecting portion such as a handhole or a manhole. About.

[0002]

2. Description of the Related Art As a conventional connection joint, for example, the one shown in FIGS. 9 and 10 is used. It is fixed to the through-hole 21A of the connecting portion 21 by a mortar or the like to form a receiving port side joint 22, and is screwed and fixed to one end of an underground pipe 24 in which a sealing material 23 is externally fitted. A connection joint is constituted by an insertion-side joint 25 that forms an insertion hole that is locked and fixed simply by being inserted into the side joint 22. 26 shown in FIG.
2 is a packing provided in the inside 2, and 27 is a retaining ring for entering and locking and fixing a concave portion 25 </ b> A formed on the outer surface of the outlet side joint 25.

[0003]

The connection joint can be completed by simply inserting the inlet joint 25 into the receptacle joint 22, but only by pulling the underground pipe 24. In this case, the retaining ring 27 locked in the concave portion 25A cannot be easily unlocked.
It was difficult to remove the underground pipe 24 from No. 1.
Also, once the connection joint is locked and fixed, there is no flexibility in the direction of the pipe axis, so that when a large tensile force or a large compressive force acts on the underground pipe 24, Absorption occurs due to expansion and contraction of the pipe 24, but the degree of absorption is also limited, and in some cases, the underground pipe 24 and the connection joint may be damaged. Further, the insertion-side end of the underground pipe 24 must be cut with high precision in accordance with the locking position of the connection joint, which is troublesome. In addition, since the receiving end of the outlet-side joint 25 in the connected state is located outside the connecting portion 21, when a large force acts on the underground pipe from a direction orthogonal to the pipe axis direction, Of the portions of the receiving-side joint 22, the receiving-side end of the inlet-side joint 25 comes into contact with the inner surface of a portion that is separated from the connection portion 21, and the connecting joint is bent or crushed at that portion. Trouble sometimes occurred.

SUMMARY OF THE INVENTION In view of the above situation, the present invention seeks to solve the problem not only in that the underground pipe connected to the connection portion can be easily removed, but also that it is free from deformation or damage for a long period of time. It is an object of the present invention to provide a connection joint that can be used in a proper state and that does not require cutting the end of an underground pipe accurately.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a spiral underground in which convex portions and concave portions are alternately located in a connection direction of a handhole, a manhole, or the like in a tube axis direction. A connection-side joint for connecting a buried pipe, the fixed-side tubular body being fixed in a state penetrating the connection portion, and capable of inserting an end of the underground pipe, A threaded portion that is screwed and integrated with the underground pipe inserted into the tubular body, and abuts against a connection portion side end of the fixed-side tubular body after the threaded portion is threaded. A connection joint was formed from the retaining tubular body having a contact portion for retaining the underground pipe. When connecting the underground pipe to the connection part, insert one end of the underground pipe into the fixed side cylindrical body fixed to the connection part, and then remove the underground pipe from the inside of the connection part. Rotating the body in one direction to the underground pipe inserted in the fixed side tubular body and screwing it together, the retaining tubular body and the underground pipe are integrated, and the underground pipe is The work of connecting to the connection section is terminated. Accordingly, the underground pipe can be detached from the connection joint by rotating the retaining tubular body in a direction opposite to the above direction and releasing the screw from the underground pipe. Further, by setting the contact portion of the retaining tubular member screwed to the underground pipe so as not to contact the connection portion side end of the fixed tubular member, the clearance distance is set. Only the underground pipe can move in the pipe axis direction,
There is an advantage that it can be used favorably even in places where land subsidence and earthquakes are frequent. Further, it is not necessary to cut the underground pipe accurately so that the connection side end of the underground pipe coincides with the connection side end of the fixed tubular body. In addition, since one end of the underground pipe is inserted into the fixed cylindrical body fixed in a state penetrating the connection portion, a large force is applied to the underground pipe from a direction perpendicular to the pipe axis direction. When acted upon, the high forces can be caught by a sturdy connection.

A plurality of cutting positions for adjusting the length of the fixed-side cylindrical body by cutting the outer surface of the fixed-side cylindrical body in accordance with the thickness of the connecting portion are provided so as to be visible. It can be cut immediately at a cutting position that matches the thickness of the wall of the connection portion.

[0007] By forming an annular cut-out recess at one or more locations in the center axis direction of the outer surface of the fixed-side tubular body, it can be cut immediately at a cutting position suitable for the thickness of the wall of the connection portion. In addition to this, the cutting blade immediately before cutting can be brought into contact with the notch concave portion to quickly perform positioning of the cutting blade.

In the case where the connecting portion is made of concrete and the fixed-side tubular body is made of a synthetic resin such as polyethylene, the connecting portion has a size larger than the outer diameter of the fixed-side tubular body. Forming a through-hole, filling the gap formed between the through-hole and the fixed-side tubular body in a state where one end of the fixed-side tubular body is inserted into the through-hole, and fixing the gap by filling with an adhesive,
An outer surface of the fixed-side tubular body corresponding to the through-hole is provided with a water-swellable sealing material. By fixing the fixed cylindrical body to the through hole of the connection portion with the adhesive as described above, it is possible to reliably avoid water leakage due to cracks and cracks when using mortar or the like. When the connecting portion is made of concrete, an adhesive having high freshness with concrete such as epoxy resin is used as the adhesive, and the adhesive is a fixed-side tubular body made of synthetic resin such as polyethylene. Since it has poor adhesiveness with water, by providing a water-swellable sealing material, a gap is generated between the adhesive and the fixed-side tubular body, and if water enters the gap, Also, the moisture can be absorbed by the water-swellable sealing material to prevent the penetration of moisture into the connection portion.

The retaining tubular body is screwed into the underground pipe, and the inner surface of the connection-side end of the retaining tubular body becomes wider outward toward the end. In this case, a cable or the like passed from the underground pipe to the connection portion can smoothly pass through the connection portion side end of the retaining tubular member without being damaged.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a circular (or square) through hole formed in a concrete connection portion 1 such as a handhole or manhole (only one is shown in the figure, but two or more are shown). The underground pipe 3 is connected to 1A via a joint 2 for connection. In the figure, the underground pipe 3 is connected to the side wall of the connecting portion 1, but may be connected to the bottom wall or the top wall.

The underground pipe 3 is made of a synthetic resin such as polyethylene so as to have flexibility and elasticity to some extent, and as shown in FIGS. Are formed in a spiral shape in which the convex portion 3A and the concave portion 3B which protrudes in a semicircular shape are alternately positioned in the tube axis direction, but the convex portion 3A and the concave portion 3B have a semi-circular shape. In addition to the circular shape, the shape may be any shape such as a square, a triangle, an ellipse, and a trapezoid.

Each member of the connection joint 2 is also made of a synthetic resin such as polyethylene similarly to the underground pipe 3, and
As shown in FIGS. 4 (a) and 4 (b), the fixed side has a dimension capable of penetrating through the through hole 1A of the connection part 1 and is capable of inserting the end of the underground pipe 3 freely. A tubular body 4, a threaded portion 5 which is screwed and integrated with the inside of the underground pipe 3 inserted into the fixed tubular body 4, and a fixed side barrel after the threaded portion 5 is threaded. A donut plate-shaped contact portion 6 is formed integrally with a donut plate-shaped contact portion 6 that contacts the end of the body 4 on the connection portion side to prevent the underground pipe 3 from coming off. The screwing portion 5 is formed of a spiral projecting piece projecting from the outer surface of the retaining tubular body 7, that is, a portion smaller than the space 3C formed on the inner surface of the convex portion 3A of the underground pipe 3. Thereby, the screwing operation of the retaining tubular body 7 to the underground pipe 3 can be easily performed with a small force, but the space 3C
May be completely buried in the connection joint 2
Is not limited to that shown in the drawing.

As shown in FIGS. 1 and 2, the inner surface 7A of the connection-side end of the retaining tubular member 7 is formed into a curved surface that expands outward toward the end, and is buried underground. When a cable is passed through the inside of the pipe 3 to the inside of the connecting portion 1, there is an advantage that the curved portion 7A can smoothly guide the cable without damaging the cable.

The fixed-side tubular body 4 has a trumpet-shaped portion 4B which is expanded outward at one end of a tubular main body 4A having a circular cross section (which may be square or any other shape). The outer diameter of the outermost edge of the portion 4B is larger than the diameter of the through hole 1A.
Even if a large pulling force acts on the fixed-side tubular body 4 fixed by the above, the fixed-side tubular body 4 is prevented from coming out to the outside. (A cylindrical shape or the like).

In the outer surface of the main body 4A, annular cut recesses 4C, 2C (one or three or more) are provided at an appropriate distance from the end opposite to the flared portion 4B. 4D is formed, and by cutting the specific notch concave portion 4C or 4D according to the thickness of the wall of the connection portion 1, the fixed side cylindrical body 4 does not protrude greatly from the connection portion 1. , And the amount of protrusion is made substantially the same. For example, if the wall thickness is 150-190
In the case of mm, as shown in FIG. 1, the notches 4C and 4D are used without cutting, and the thickness of the wall is 1 mm.
In the case of 10 to 150 mm, as shown in FIG. 5, the notch concave portion 4D is cut and used. When the thickness of the wall is 30 to 110 mm, as shown in FIG. By cutting and using the concave portion 4C for use,
While using a single fixed-side tubular body 4, the fixed-side tubular body 4 having three kinds of dimensions (lengths) is produced by cutting the notch concave portions 4C or 4D according to the thickness of the wall. can do. The notches 4C, 4D
Is formed in a V-shape as shown in FIG. 3 and may be U-shaped, and the depth thereof is shallow (for example, 0.5 mm) such that the cutting blade can enter and be positioned. Even if it is set to such a size, it is sufficiently possible to visually recognize them, but by forming the concave portions 4C and 4D, a large convex portion does not protrude inward from the inner surface of the fixed side cylindrical body 4. It doesn't matter. The notch recesses 4C, 4D
Alternatively, the cutting position may be given by magic or the like.

A rectangular (square or triangular) projecting radially outward with an appropriate interval in the outer peripheral direction is provided at a portion of the outer surface of the fixed side cylindrical body 4 near the flared portion 4B. , Etc.), a large number of protrusions 4T can be formed to increase the area of adhesion to the adhesive 8 and to prevent the fixed side cylindrical body 4 from rotating and to remove Although the stopping effect can be achieved at the same time,
It is not necessary. In addition to the protrusions 4T, the surface of the fixed-side cylindrical body 4 may be subjected to unevenness processing for enhancing adhesiveness. A recess 4E is formed in the outer surface of the fixed-side tubular body 4 at a position closer to the flared portion 4B than substantially at the center in the tube axis direction, thereby increasing the shape-retaining strength of the fixed-side tubular body 4. In addition to the effects, when the underground pipe 3 with the water-absorbing and expandable sealing material 10 described later is inserted into the fixed-side tubular body 4, the sealing material 10 is received and the ground to the fixed-side tubular body 4 is received. Although a stopper effect for preventing the positioning of the middle buried pipe 3 and the movement of the buried pipe 3 to the connecting portion 1 side can be exhibited, it is not always necessary. In addition, a ring-shaped water-swellable sealing member 9 made of a water-swellable rubber can be held between the recess 4E and the protrusion 4T on the outer surface of the fixed-side cylindrical body 4. An annular concave portion 4F is formed, and the adhesiveness between the adhesive and the fixed-side tubular body 4 is poor, a gap is generated between the two, and even when moisture passes through the gap, the moisture is absorbed. Although the moisture is prevented from entering the connection portion 1 by absorbing and expanding the expandable sealing material 9, the surface of the fixed side cylindrical body 4 is subjected to unevenness processing as described above. By forming the surface of the fixed-side cylindrical body 4 on an uneven surface (rough surface that is not smooth), the water-swellable sealing material 9 can be omitted.

A joint 2 for connection is provided in the through hole 1A of the connection portion 1.
The process of connecting the underground pipe 3 via the above will be described with reference to FIG. First, the fixed-side cylindrical body 4 is inserted into the through-hole 1A formed in the connection part 1 from the inside of the connection part 1 in the factory or on-site, and the outer surface of the fixed-side cylindrical body 4 and the through-hole 1A of the connection part 1 are inserted.
Is filled with an adhesive 8 and fixed. Next, the underground pipe 3 in which the water-absorbing and expanding sealing material 10 is externally fitted to the convex portion 3A at a predetermined position is inserted into the fixed-side tubular body 4 from outside the connection portion 1. At this time, the insertion of the underground pipe 3 into the fixed-side tubular body 4 is completed by the contact of the sealing material 10 with the concave portion 4E, and the insertion-side tip of the underground pipe 3 and the fixed-side pipe 3 The connecting portion side end of the shape 4 is aligned in the vertical direction. By making it in such a uniform state, there is an advantage that even if a large force acts on the underground pipe 3 from a direction perpendicular to the pipe axis direction, it can be avoided satisfactorily. It is not necessary. After this, the connection 1
Then, the retaining tubular body 7 is screwed into the underground pipe 3 from the inside to complete the retaining process and terminate the connection work. As shown in FIG. 1, the retaining cylindrical member is formed so that a gap S is generated between the contact portion 6 of the retaining cylindrical member 7 and the connection-side end of the fixed-side cylindrical member 4. When the underground pipe 3 is screwed in, the underground pipe 3 moves by the gap S when the tensile force acts on the underground pipe 3 in a place where there is a lot of land subsidence or an earthquake. However, when unnecessary, as shown in FIG. 7, the contact portion 6 of the retaining tubular member 7 and the fixed-side tubular member 4 can be absorbed.
May be set in a state of contact with the end portion on the connection portion side.

The outer fitting position of the water-swellable sealing material 10 with respect to the underground pipe 3 is set at the position shown in FIG. Although it is preferable that the portion and the connection-side end of the fixed-side tubular body 4 can be aligned in the up-down direction, it is preferable that the position of the sealing material 10 be set to a position other than the position shown in the drawing. Good. For example, a sealing material is adhered and fixed to the surface of the contact portion 6 of the retaining tubular member 7 on the fixed side tubular member 4 side, and this sealing material is pressed against the end face of the fixed tubular member 4 at the connection portion side to seal the portion. When the underground pipe 3 is pushed into the connection portion 1 for some reason, a gap is generated between the sealing material and the connection-side end face of the fixed-side tubular body 4 so that the sealing is performed. However, if the sealing material 10 is externally fitted to the underground pipe 3 as described above, there is an advantage that even if the underground pipe 3 moves to some extent, it cannot be sealed. Further, although the retaining tubular body 7 is screwed inside the underground pipe 3, the retaining tubular body 7 may be screwed outside the underground pipe 3. In this case, the inside of the underground pipe 3 can be made flat, and there is an advantage that when the wire passes through the underground pipe 3, it can be smoothly performed without being caught.

[0019]

According to the first aspect, the retaining tubular body is screwed to the underground pipe inserted into the fixed tubular body fixed in a state penetrating the connecting portion. Thereby, the retaining tubular member is released from the screw engagement, and the underground pipe can be easily removed from the connection joint. Also, by setting the contact portion of the retaining tubular member screwed to the underground pipe so as not to contact the connecting portion side end portion of the fixed tubular member, only the clearance distance is provided. The underground pipe can move in the axial direction of the pipe, and can be used in a good condition without deformation or damage even in a place where land subsidence or an earthquake occurs frequently. Also, if the retaining tubular body can be screwed into the underground pipe, the connecting portion side end of the underground pipe should coincide with the connecting portion side end of the fixed tubular body. It is not necessary to cut the underground pipe accurately, which is advantageous in terms of construction. In addition, since one end of the underground pipe is inserted into the fixed cylindrical body fixed in a state penetrating the connection portion, a large force is applied to the underground pipe from a direction perpendicular to the pipe axis direction. When acted, the large force can be received by the strong connection, and can be used in a good condition without deformation or damage for a long time, which is advantageous in terms of durability.

According to the second aspect, a plurality of cutting positions for adjusting the length of the fixed-side tubular body by cutting according to the thickness of the connecting portion can be visually recognized on the outer surface of the fixed-side tubular body. In this case, the cutting can be performed immediately at a cutting position that matches the thickness of the wall of the connecting portion, and the cost can be reduced by using a mold in common.

According to the third aspect, by forming an annular notch recess at one or a plurality of locations on the outer surface of the fixed-side cylindrical body in the center axis direction, a cutting position suitable for the thickness of the wall of the connection portion is provided. In addition to being able to cut immediately,
The positioning of the cutting blade can be quickly performed by contacting the cutting blade immediately before the cutting with the notch concave portion, and the cutting time can be reduced.

According to the fourth aspect, the fixed-side tubular body is fixed to the through-hole of the connecting portion with an adhesive, so that water leakage due to cracks and cracks when mortar or the like is used is reliably avoided. , And can be configured without water leakage for a long period of time. In addition, an adhesive having a high degree of freshness with concrete, such as epoxy resin, is used as the adhesive, and this adhesive has poor adhesion to the fixed-side tubular body made of a synthetic resin such as polyethylene. Therefore, by providing a water-swellable sealing material, a gap is generated between the adhesive and the fixed-side cylindrical body, and even if water enters the gap, the water is absorbed and expanded. The sealing material absorbs and can prevent the intrusion of moisture into the connection portion, which is not a problem.

According to the fifth aspect, the retaining tubular body is screwed inside the underground pipe, and the inner surface of the connecting portion side end of the retaining tubular body expands outward toward the end. By forming on the curved surface that becomes, the cable etc. passed from the underground pipe to the connection part can be smoothly passed without damaging the inner surface of the connection part side end of the retaining tubular body,
An exclusive member, a so-called bell mouth, can be dispensed with.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a state where an underground pipe is connected to a connection portion having a thick wall via a connection joint.

FIG. 2 is an exploded side view in which only an upper half of an underground pipe and a connection joint are shown in cross section.

FIG. 3 is a side view of a fixed-side tubular body.

FIG. 4 shows a fixed side tubular body, (a) is a sectional view thereof,
(B) is a sectional view taken along line II in (a).

FIG. 5 is a cross-sectional view showing a state where an underground pipe is connected to a connection portion having a solid wall via a connection joint.

FIG. 6 is a cross-sectional view showing a state where an underground pipe is connected to a connection portion having a thin wall via a connection joint.

FIG. 7 is a cross-sectional view showing a state in which the retaining tubular member in FIG. 1 is completely screwed.

FIG. 8 is an explanatory diagram showing a state immediately before connecting an underground pipe to a connection portion.

FIG. 9 is a cross-sectional view showing a state where an underground pipe is connected to a connection portion via a conventional connection joint.

FIG. 10 is a cross-sectional view showing a state immediately before connecting an underground pipe to a connection portion via a conventional connection joint.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Connection part 1A Through-hole 2 Pipe connection joint 3 Underground pipe 3A Convex part 3B Concave part 3C Space 4 Fixed side cylindrical body 4A Body part 4B Wrap-shaped part 4C, 4D, 4E, 4F Concave part 4T Projection part 5 Screw Part 6 Contact part 7 Retaining tubular body 7A Inner surface 8 Adhesive 9,10 Water expansion packing 21 Connection part 21A Through hole 22 Receptacle side joint 23 Sealing material 24 Underground pipe 25 Entrance side joint 25A Recess 26 Packing 27 Retaining ring S Clearance

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F16L 33/28 H02G 9/06 B H02G 1/06 311 F16L 33/00 B 9/06

Claims (5)

[Claims] 1. A connection joint for connecting a spiral buried underground pipe in which convex parts and concave parts are alternately positioned in a pipe axis direction at a connecting part such as a handhole or a manhole. A fixed-side tubular body that is fixed in a state penetrating through the portion and into which the end of the underground pipe can be inserted, and is screwed and integrated with the underground pipe inserted into the fixed-side tubular body. And a contact portion that contacts the end of the fixed-side tubular body on the connection portion side after screwing of the screw portion to prevent the underground pipe from coming off. A connection joint comprising a retaining tubular body provided. 2. A plurality of cutting positions for adjusting the length of the fixed-side cylindrical body by cutting the outer surface of the fixed-side cylindrical body in accordance with the thickness of the connecting portion are provided so as to be visible. The connection joint according to claim 1. 3. The connecting joint according to claim 1, wherein an annular cut-out recess is formed at one or a plurality of locations on the outer surface of the fixed-side tubular body in the central axis direction. 4. When the connecting portion is made of concrete and the fixed-side tubular body is made of a synthetic resin such as polyethylene, the connecting portion is larger than the outer diameter of the fixed-side tubular body. A through hole having a dimension is formed, and a gap formed between the through hole and the fixed side cylindrical body is filled with an adhesive in a state where one end of the fixed side cylindrical body is inserted into the through hole and fixed. The connection joint according to claim 1, wherein a water-absorbing and expanding sealing material is provided on an outer surface of the fixed-side tubular body corresponding to the through-hole. 5. A structure in which the retaining tubular body is screwed into the underground pipe, and the inner surface of the connection-side end of the retaining tubular body becomes wider toward the end. The connection joint according to claim 1, wherein the connection joint is formed on a curved surface.