JPH0646076B2 - Propulsion fume pipe joint structure and its formwork - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a joint structure for a propulsion fume pipe and its formwork.

[Conventional technology]

The conventional joint structure of this type of fume pipe for propulsion is described in JP-B-61-616 and JP-B-61-617.

[Problems to be Solved by the Invention]

However, in the above-mentioned conventional technique, since the anchor reinforcing bar and the joint collar are integrated by welding, the anchor reinforcing bar and the joint collar are formed of the same material, and the joint collar is made of synthetic resin or the like and cannot be welded. Has a problem that it is difficult to use anchor rebar.

Further, when the materials of the joint collar and the anchor rebar are different, such as stainless steel and iron, the materials are changed by welding, and it is difficult to integrate them by welding.

Further, there is a problem that the welding work mainly involves a manual work part due to the nature of the work, and the welding is costly because a special qualification is required.

Since the string-shaped water-expandable rubber is attached to an arbitrary position by adhesion, its end portion is polymerized and the attaching position cannot be specified, so that there is a problem that the attaching position is slightly moved by an operator.

Further, when the adhesive portion of the water-expanded rubber is broken, the adhesive remains on the surface of the rubber, and water cannot be supplied to the expanded rubber to stop water.

Although it is possible to eliminate the curling of the joint collar by integrating the fume pipe and the joint collar, there is a problem that it has not been completely eliminated.

When a high-strength material that can reduce the thickness of the joint collar is used, the edges were conventionally chamfered to improve the bondability. There is a problem in that it becomes possible, or even if chamfering, the effect of chamfering cannot be obtained.

[Means for Solving the Problems]

In order to achieve the above object, in the joint structure of the propulsion fume pipe in the present invention, the joint structure of the propulsion fume pipe in which the joint collar is fixed at one end in the pipe axial direction and the spigot portion is formed at the other end. In the above, the one end portion is provided with an expansion rubber, an anchor rebar formed in a spring back, and a curl portion for holding the expansion rubber is provided at a terminal and a recess for holding the anchor rebar is provided,
In addition, the insertion opening side edge is fixed in combination with a joint collar that is bent slightly outward, and the spigot portion is provided with a first concave portion that is inclined downward toward the inlet side and an inner side of the concave portion. A second recess is formed, a first rubber ring is disposed in the first recess, and a second rubber ring is disposed in the second recess.

Further, in the form of the propulsion fume pipe, the expansion rubber is attached to the curl portion of the terminal, the anchor rebar formed in the spring back is arranged in the recess, and the joint collar is pressed in a state of pressing the insertion side edge. It is arranged in a mold and a leak-proof packing is arranged near the curl portion.

[Action]

When molding the mold, the joint collar is mounted with expansion rubber on the curl part of the end, and the anchor rebar formed in the spring back is placed in the recess, and the joint collar is used as the mold while pressing the insertion side edge. It is molded by arranging it and arranging a leakproof packing near the curl portion.

In addition, the first and second rubber rings are bonded or arranged 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 3, the joint structure of the fume pipe according to the present invention has a joint collar 2 fixed to one end E of the fume pipe 1 in the axial direction of the tube, and to the other end F of the fume pipe 1. Has a spigot portion P formed by reducing the diameter of the joint collar 2.

The one end E is provided with an expansion rubber 3, an anchor rebar 4 formed in a springback, a curl portion 21 for holding the expansion rubber 3 at a terminal, and a recess 22 for holding the anchor rebar 4 is provided and inserted. It is fixed in combination with the joint collar 2 in which the mouth-side edge 23 is bent slightly outward.

The joint collar 2 is made of stainless steel, synthetic resin, iron or the like, and the thickness thereof is not particularly specified, but a thickness of about 2 mm to 3 mm is used.

The expansive rubber 3 has a circular cross section or a cross sectional shape similar thereto.

The anchor rebar 4 is configured to fit tightly in the recess 22 when mounted in the recess 22 of the joint collar 2, and the circumferential length of the anchor rebar 4 is preset according to the diameter of the recess 22.

Further, the end of the joint collar 2 is formed with a curl portion 21 having a diameter that allows the expansion rubber 3 to be tightly fitted, and when the curl portion 21 is processed, a material is not changed in a bent portion. .

As shown in FIG. 3, in the spigot portion P, a first concave portion 5 having a reverse slope inclined toward the inner side toward the entrance side and a second concave portion 6 inside the concave portion 5 are formed. Has been done.

Further, in the first concave portion 5, a bottom surface is formed in a slope of the concave portion 5, and an upper surface inlet side is formed with an inclined surface 52 downward toward the inlet side so that it can be smoothly inserted into the joint collar 2. The first rubber ring 51 is adhered or arranged 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 are solid ones shown in FIG. 1 or ones having hollow holes 53 formed to have elasticity as shown in FIG. Any of those provided with a plurality of grooves is selected and used.

Further, if a cushion material 7 such as a synthetic resin, a solidified chip, or plywood is arranged at the joint, damage to the joint can be prevented.

Further, in the formwork at the time of manufacturing the fume tube, as shown in FIG. 4, the formworks 82 and 83 on both sides, the upper formwork 81, and the formwork 84 forming the other end F are arranged. The expansion rubber 3 is attached to the curl portion 21 of the end of the mold 81, and
The anchor rebar 4 formed in the spring back is arranged on the spring 22, the joint collar is arranged in a state of pressing the inclined insertion side edge 23, and the mortar leak-proof packing 85 is arranged near the curl portion 21. ing.

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

A leak-proof packing 86 is arranged at the tip of the fume tube 1 to prevent the mortar from leaking.

〔The invention's effect〕

Since the present invention is configured as described above, it has the following effects.

Since the anchor rebar is attached using springback, welding between the joint collar and the anchor rebar is not necessary, and it is possible to install even the dissimilar material between the joint collar and the anchor rebar.

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

In addition, the anchor rebars can be easily attached even if the materials cannot be welded together.

By attaching the water-expandable rubber to the curl portion of the terminal, the water-expandable rubber can be used as an integral ring, and the water-proof property can be improved by eliminating the conventional polymer bonding.

Further, since the curl portion is attached by the elastic repulsion force of the water-expanded rubber, no adhesive is required. Even if an edge break occurs between the joint collar and the expanded rubber, the adhesive does not cover the surface of the expanded rubber, so that water is supplied to the expanded rubber and the original water blocking function can be exhibited.

Because the end of the joint collar is curled,
Stronger than the conventional type. In addition, there is also a method of bending the terminal at a right angle to prevent "turning", but in this case it is easy to change the material and variation in the thickness of the material, but by forming it in a curl shape, these The problem can be solved.

Since the insertion side edge of the joint collar is bent outward and formed into a trumpet shape, even a joint collar made of a thin material can be easily joined.

Since the first recessed part is formed on the insertion port side of the spigot part so that it slopes downward, it has a structure that the entrance side is conventionally lowered. The agent acts as a lubricant when joined before curing, and the rubber ring slipped, making it difficult to insert. However, the present invention solves the above problems because the gradient direction of the portion is opposite. .

When manufacturing the fume tube, the inclined part of the insertion side edge is pressed by the upper mold and the curl is pressed against the mold with the concave part as a fulcrum and adheres closely to it, so that mortar can be prevented from entering and post-treatment of the collar can be performed. In addition to being unnecessary, manufacturing can be performed efficiently.

[Brief description of drawings]

1 and 2 are cross-sectional views of a joint structure of a fume pipe for propulsion, FIG. 3 is a cross-sectional view of a main part of the other end, FIG. 4 is an explanatory view of a form, FIG. 5 and FIG. It is explanatory drawing of the joint structure of a prior art example.

Claims (2)

[Claims] 1. A joint collar is fixed to one end of the pipe in the axial direction,
In the joint structure of the propulsion fume pipe in which the spigot portion is formed at the other end portion, the expansion rubber, the anchor rebar formed in the spring back, and the curl portion for holding the expansion rubber at the end are provided at the one end portion. Providing a recess to hold the anchor rebar,
In addition, the insertion opening side edge is fixed in combination with a joint collar that is bent slightly outward, and the spigot portion is provided with a first concave portion that is inclined downward toward the inlet side and an inner side of the concave portion. A propulsion fume pipe joint structure comprising a second recess, a first rubber ring disposed in the first recess, and a second rubber ring disposed in the second recess. 2. The joint collar according to claim 1, wherein expansion rubber is attached to the curl portion of the terminal, an anchor rebar formed in a spring back is arranged in the recess, and the insertion side edge is pressed. A propulsion fume tube formwork which is placed in a formwork and has leak-proof packing near the curl portion.