JPH0495686A - Propulsion hume pipe joint structure and its formwork - Google Patents

Abstract

PURPOSE:To enable chamfering of a joint collar without making thin by having an expansion rubber, an anchor reinforced bar and a curl portion as well as a recess portion provided and fixed in combination with the joint collar to form the first recess portion in which the first rubber ring is arranged and the second recess portion in which the second rubber ring is arranged, on a spigot portion. CONSTITUTION:A Hume pipe 1 has a joint collar 2 fixed at one end E and a spigot portion P formed at the other end F. At one end E, an expansion rubber 3, an anchor reinforced bar 4 formed in springback and a curl portion 21 to embrace the expansion rubber 3 as well as a recess portion 22 to hold the anchor reinforced bar 4 are provided and fixed in combination with the joint collar 2. The spigot portion P has the first recess portion 5 and the second recess portion 6 formed. The first recess portion 5 has a rubber ring 51 arranged, while the second recess portion 6 has the second rubber ring 61 arranged. As a result, a high-cost material joint collar is realized by making the anchor reinforced bar of low-cost material.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a joint structure for a propulsion hume pipe and a formwork thereof.

[Conventional technology]

Conventional joint structures of this type of propulsion hume tube are described in Japanese Utility Model Publication No. 61-616 and Japanese Utility Model Publication No. 61-617.

[Problem to be solved by the invention]

However, in the conventional technology mentioned above, ■Since the anchor reinforcing bar and the joint collar are integrated by welding, the anchor reinforcing bar and the joint collar are made of the same material, and the material of the joint collar is synthetic resin etc. that cannot be welded. In this case, it is difficult to use anchor reinforcing bars.

Further, if the joint collar and the anchor reinforcing bar are made of different materials, such as stainless steel and iron, the materials change during welding, making it difficult to integrate them by welding.

Further, due to the nature of the work, welding work is mainly manual work, and welding requires special qualifications, which increases costs.

■The string-like water-expandable rubber is attached to any position by adhesive, and the ends are polymerized and the position cannot be specified, so the position may move slightly depending on the operator. There is a problem.

Further, if the adhesive part of the water-expandable rubber breaks, the adhesive remains on the surface of the rubber, and there is a problem that water cannot be stopped because water is not supplied to the expandable rubber.

■It is possible to eliminate the curling of the joint collar by integrating the hump tube and the joint collar, but there are still problems that have not been completely resolved. ■High-strength materials that can reduce the thickness of the joint collar Conventionally, when using materials, the edges were chamfered to improve jointability, but as the wall thickness of the joint collar becomes thinner, chamfering becomes impossible, or even if chamfering is done, the effect of chamfering is reduced. The problem is that it cannot be obtained.

[A means of promise to solve problems]

In order to achieve the above object, in the joint structure of the propulsion fume pipe of the present invention, a joint collar is fixed to the blade end in the tube axis direction, and a spigot part is formed at the other end of the propulsion fume pipe. In the joint structure, the blade end is provided with an expanding rubber, an anchor reinforcing bar formed in a springback manner, a curled part that holds the expanding rubber at the end, and a recessed part that holds the anchor reinforcing bar,
It is fixed in combination with a joint collar whose edge on the side of the insertion port is bent slightly outward, and the spigot part has a first recess that is inclined downward toward the back on the artificial side, and a first recess that extends inwardly from the recess. A second recess is formed, a first rubber ring is disposed in the first recess, and a second rubber ring is arranged in the second recess.

In addition, in the formwork of the propulsion fume pipe, an expansion rubber is attached to the curled part of the end, and an anchor reinforcing bar formed with springback is placed in the recessed part, and the joint collar is inserted while pressing the insertion side edge. It is placed in a formwork, and a leak-proof gasket is placed near the curled portion.

[Effect]

When forming the joint collar in the formwork 6, expandable rubber is attached to the curled part of the end, and an anchor reinforcing bar formed with springback is placed in the recessed part, and the joint collar is placed in the formwork while pressing the insertion side edge. A leak-proof gasket is placed near the curled portion and molded.

Furthermore, first and second rubber rings are adhered or placed in the first and second recesses at the other end of the joint collar.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings.

1 to 3FIII, the joint structure of the hume tube according to the present invention is as follows: the tube axis direction of the hume tube 1 - the blade end E
A joint collar 2 is fixed to the other end I of the hume pipe 1.
A spigot portion P is formed at P so as to have a smaller diameter than the joint collar 2.

The blade end E is provided with an inflatable rubber 3, an anchor reinforcing bar 4 formed in a springback manner, a curled part 21 that holds the inflatable rubber 3 at the end, and a recessed part 22 that holds the anchor reinforcing bar 4, and It is fixed in combination with a joint collar 2 whose insertion port side edge 23 is bent slightly outward.

The joint collar 2 is made of stainless steel, synthetic resin, iron, etc., and although the thickness is not particularly specified, a thickness of approximately 2 mm to 3 mm is used.

The expandable rubber 21 used has a circular cross-section or a cross-sectional shape similar to this.

The anchor reinforcing bar 4 is configured to tightly fit into the recess 22 of the joint collar 2 when installed in the recess 22, and the circumferential length of the anchor reinforcing bar 4 is set in advance according to the diameter of the recess 22.

Further, at the end of the joint collar 2, a curled part 21 is formed with a diameter that allows the expansion rubber 21 to fit tightly into it, and when the curled part 21 is processed, it is processed so that no material change occurs at the bent part. .

As shown in FIG. 3, the spigot part P has a first recess 5 with a reverse slope inclined downward toward the entrance and a second recess 6 inside the recess 5. has been done.

In addition, the first recess 5 has a bottom surface formed on the slope of the recess 5, and an upper entrance side formed with an inclined surface 52 slanting downward toward the prosthetic side so that the fitting collar 2 can be smoothly inserted into the first recess 5. The first rubber ring 51 is adhered or placed by a predetermined means.

A second rubber ring 61 is arranged in the second recess 6.

The first rubber ring 51 and the second rubber ring 61 may be solid as shown in FIG. 1, or may have a hollow hole 53 formed at the upper end as shown in FIG. Either one with a plurality of grooves provided therein is selected and used.

Furthermore, if a cushioning material 7 such as synthetic resin, hardened chips, or plywood is placed at the joint, damage to the joint can be prevented.

Furthermore, as shown in FIG.
1 and a formwork 84 forming the other end F are arranged, and the upper formwork 81 has an expansion rubber 3 attached to the curled part 21 of the end, and an anchor reinforcing bar 4 formed in a springback shape in the recessed part 22. , the joint collar is placed in a state where it presses the inclined insertion side edge 23, and the curled portion 2
A mortar leak-preventing gasket 85 is placed near 1.

The formworks 82 and 83 on both sides and the upper formwork 81 are assembled by tightening them with bolts 87 and nuts 88.

In addition, there is a leak-proof gasket 86 at the tip of the hump tube 1.
[Effects of the Invention] Since the present invention is configured as described above, it produces the following effects.

■Since the anchor reinforcing bars are installed using springback, there is no need to weld the joint collar and anchor reinforcing bars, and the joint collar and anchor reinforcing bars can be installed even if they are made of different materials.

As a result, it has become possible to use an expensive material for the joint collar and an inexpensive material for the anchor reinforcing bar.

Furthermore, anchor reinforcing bars can be easily attached to materials that cannot be welded together.

■ By attaching the water-expandable rubber to the curled portion of the end, it becomes possible to use the water-expandable rubber as a single piece as a ring, eliminating the conventional polymerization bond and improving water-stopping properties.

Further, since the curled portion is attached by the elastic repulsive force of the water-expandable rubber, no adhesive is required. Even if a break occurs between the joint collar and the inflatable rubber, the adhesive will not cover the surface of the inflatable rubber, so water will be supplied to the inflatable rubber and it will be able to perform its original water-stopping function.

■Because the end of the joint collar is formed into a curled shape,
More resistant to "turning" than conventional types. Another method is to bend the terminal at right angles to prevent it from curling up, but in this case, changes in the material and variations in material thickness tend to occur. Problems can be resolved.

■The insertion side edge of the joint collar is bent outward to form a trumpet shape, making it possible to easily join even joint collars made of thin materials.

■The first concave part is formed on the insertion opening side of the spigot part so that it slopes downward toward the back. Conventionally, the artificial side of the spigot part is downwardly downward, and when adhesive is applied to the insertion part of the rubber ring. When the adhesive is bonded before hardening, it acts as a lubricant, and the rubber ring slips, making it difficult to attach.However, in the present invention, the slope direction of the part is reversed, so the above problem is solved. resolved.

■When manufacturing humid pipes, the sloped part of the insertion side edge is pressed by the upper formwork, and the curled part is pressed against the formwork using the concave part as a fulcrum, which prevents mortar from entering and leaves the collar behind. No processing is required and manufacturing can be done more efficiently.

[Brief explanation of the drawing]

Figures 1 and 2 are cross-sectional views of the joint structure of the propulsion hume pipe, Figure 3 is a cross-sectional view of the main parts of the other end, Figure 4 is an explanatory view of the formwork, and Figures 5 and 6 are It is an explanatory view of a joint structure of a conventional example. Figure 1 Figure 2 Figure e Procedure amendment (voluntary) January 14, 1991

Claims (2)

[Claims] (1) In a joint structure for a propulsion fume tube in which a joint collar is fixed at one end in the tube axis direction and a spigot is formed at the other end, the one end is provided with expansion rubber and an anchor formed in a springback shape. A reinforcing bar and a curled part to hold the expansion rubber at the end are provided, as well as a recessed part to hold the anchor reinforcing bar,
It is fixed in combination with a joint collar whose edge on the insertion port side is bent slightly outward, and the spigot part has a first recess that is inclined downward toward the entrance side and a part that extends inward from the recess. A joint structure for a propulsion fume pipe, comprising a second recess, a first rubber ring disposed in the first recess, and a second rubber ring disposed in the second recess. (2) Attach an expansion rubber to the curled portion of the end, place an anchor reinforcing bar formed with springback in the recess, and press the insertion side edge to attach the joint collar according to claim 1 to the formwork. A formwork for a propulsion fume tube, the formwork comprising a leak-proof packing arranged near the curled part.