JPH0579169U - Hose for placing ready-mixed concrete - Google Patents

Abstract

(57) [Summary] [Purpose] At the same time, it is possible to easily connect two or more ready-mixed concrete hoses at the construction site, and at the same time, local wear due to deformation of the end on the discharge side and reinforcement from the end surface. We provide a hose for pouring ready-mixed concrete with no wires protruding. [Structure] A hose body 1 made of rubber or plastic having a reinforcing wire 4 spirally wound inside, and an inner peripheral surface, an outer peripheral surface and an end surface of the end portion which are attached to both ends of the hose body 1 are integrally formed. A metal ring 10 composed of an inner ring 11 and an outer ring 12 that cover the inner surface of the hose body 1, and the outer peripheral surface of the outer ring 12 forms a step from the outer peripheral surface of the hose body 1 and projects outwardly for raw concrete casting. hose. With the victor joint 14 fastened on the outer periphery of the metal ring 10, two or more ready-mixed concrete hoses can be easily connected.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a hose for placing ready-mixed concrete, which is connected to the tip of a transfer steel pipe for pumping ready-mixed concrete by using a concrete pump and used for discharging the ready-mixed concrete to a place for placing.

[0002]

[Prior Art]

 During construction work and civil engineering work, when placing ready-mixed concrete, the concrete pump is used to pump the ready-mixed concrete through a transfer steel pipe such as a boom to near the placement site, and at the placement site, a flexible hose that can be flexed lightly and freely is transferred. In many cases, a fresh concrete is placed while connecting to a steel pipe and the operator holding and moving this placing hose.

Such a raw concrete casting hose is made of rubber or plastic, and usually has an inner diameter of about 75 to 200 mm and a length of about 1 to 10 m. Fig. 3 shows an example of a conventional rubber hose for placing ready-mixed concrete. The hose body 1 is mainly composed of an inner rubber layer 2 and an outer rubber layer 3, and a reinforcing wire 4 made of a piano wire or SWB steel or the like is spirally wound between the two, so that the hose body 1 can be pressed against the pressure of ready-mixed concrete. I can bear it.

Further, generally, as shown in FIG. 3, a fiber interlocking cord 5 in which nylon or polyester yarn is knitted in a comb shape is wound around each side or one side of the reinforcing wire 4 in one layer or in plural layers. There are many ready-mixed concrete placing hoses whose outer periphery is fixed by a single fiber cord 6 wound between reinforcing wires 4.

Incidentally, in these conventional ready-mixed concrete placing hoses as well, a joint fitting for connection was attached to the end portion on the side to be connected to the transfer steel pipe. As shown in FIG. 3, the conventional joint fitting has an outer cylinder sleeve fitting 8 in which the inner cylinder insert fitting 7 fitted in the inner peripheral surface of the connection side end of the hose body 1 is expanded and inserted in the outer peripheral surface. The hose body 1 is sandwiched between the inner cylindrical insert fitting 7 and the annular projecting portion 9 provided on the outer periphery of the connecting side end of the inner tubular insert fitting 7 and the annular projecting portion of the transfer steel pipe. By fastening the joint, a hose for placing ready-mixed concrete is connected to the transfer steel pipe.

However, in the conventional ready-mixed concrete placing hose, it is desirable that the end on the opposite side (ready-mixed concrete discharge side) is lightweight so that the operator can hold it in his hand and move it. No fittings were attached to the ends. Therefore, the conventional ready-mixed concrete placing hoses could not be connected to each other.

Therefore, there is no problem when placing the ready-mixed concrete with a radius of about the length of the hose for placing the ready-mixed concrete around the connection point with the transfer steel pipe, but when placing the ready-mixed concrete at a farther place, the transfer is performed. There was no choice but to add steel pipes, and in this case the handling steel pipes themselves were heavy and not easy to handle.

Further, since the ready-mixed concrete placing hose has a built-in reinforcing wire, it is flexible, and therefore, while the placing work is performed while holding the discharge side end portion in the hand or tying it with a rope. In addition, the discharge side end, which is originally circular, is easily deformed into an elliptical shape or a triangular shape, and the deformed and protruding part is pulled around on concrete or the like at the site of the installation, causing local wear. There was a drawback.

Further, the pulsation of the ready-mixed concrete discharged causes the whole hose for placing the ready-mixed concrete to expand or contract or vibrate, but since the end portion on the discharge side is not protected by being exposed as described above, the reinforcing wire provided inside is It often came out from the end face of the discharge side end. Using a hose with the tip of the reinforcing wire protruding from the end surface is extremely dangerous in terms of work.Therefore, when the reinforcing wire jumps out, stop the placement work and cut the protruding wire with a clipper. Otherwise, it was necessary to replace the ready-mixed concrete placing hose.

[0010]

[Problems to be solved by the device]

 In view of the above conventional circumstances, the present invention aims to make it possible to easily connect two or more ready-mixed concrete hoses at the pouring site instead of connecting the transfer steel pipe when the pouring place is moved to a distance. At the same time, the purpose of the present invention is to provide a ready-mixed concrete hose that can be used with peace of mind for a longer period than before by eliminating local wear due to deformation of the end on the discharge side and protrusion of reinforcing wire from the end surface. ..

[0011]

[Means for Solving the Problems]

 In order to achieve the above object, in a hose for placing raw concrete of the present invention, a hose body made of rubber or plastic having a reinforcing wire wound in a spiral shape inside, and a hose body attached to both ends of the hose body. A metal ring consisting of an inner ring that covers the inner peripheral surface of the inner part and an outer ring that covers the outer peripheral surface of the inner ring, and the collar and / or the outer ring of the outer ring protruding outward from the edge of the hose body end side of the inner ring. The end surface of the hose body is integrally covered with a flange protruding inward from the end edge of the hose body, and the outer peripheral surface of the outer ring forms a step from the outer peripheral surface of the hose body and projects outward. It is characterized by

The hose body may have the same length, inner diameter, structure, etc. as long as a reinforcing wire made of a piano wire or SWB steel is spirally wound inside. For example, the structure of the hose body is a single fiber cord in which one or more layers of fiber blind cords such as nylon and polyester are wrapped around each side or one side of the reinforcing wire inside and the outer circumference is wrapped between the reinforcing wires. The structure may be fixed by.

[0013]

[Action]

 As shown in FIG. 1, the hose for pouring fresh concrete of the present invention has a metal ring 10 composed of an inner ring 11 and an outer ring 12 attached to both ends of the hose body 1, and The end portion of the hose body 1 is almost or completely covered by the collar portion 13 of the metal ring 10. That is, in the metal ring 10 of FIG. 1, both the inner ring 11 and the outer ring 12 have a flange portion 13, and both the flange portions 13 form a unit and completely cover the end portion of the hose body 1 without a gap. ing. However, the collar portion 13 may be provided only on the edge of either the inner ring 11 or the outer ring 12.

The material of the metal ring 10 is preferably made of iron such as BA class of STKM steel, but there is no particular problem as long as it is made of metal having rigidity. In addition, the method of attaching the metal ring 10 to the end portion of the hose body 1 is to insert the inner ring 11 into the inner peripheral surface of the end portion and the outer ring 12 into the outer peripheral surface thereof, and expand the inner ring 11 The most preferable method is to make the inner diameter of the hose match the inner diameter of the hose so that the hose body 1 is held between the outer ring 12 and the outer ring 12, but other methods can also be used.

As described above, since the metallic ring 10 having rigidity is attached to both ends of the raw concrete casting hose of the present invention so as to cover the end faces, not only the connection side with the transfer steel pipe but also the raw concrete The end on the discharge side is hardly worn, and the reinforcing wire 4 embedded in the hose can be prevented from jumping out from the end face. Therefore, the life time of the ready-mixed concrete casting hose of the present invention is much longer than that of the conventional hose before it becomes unusable.

Further, the ready-mixed concrete placing hose of the present invention can easily connect the ready-mixed concrete placing hoses to each other by using a known victoric joint. That is, as shown in FIG. 2, the ends of the two ready-mixed concrete hoses are opposed to each other, and a rubber ring 15 having a special shape is provided on the outer peripheral surface of the metal ring 10 attached to each of the opposed ends. After fitting, the housing 16 divided into two parts is covered from above, and the divided parts of the housing 16 are fastened with bolts and nuts.

A feature of the victoric joint such as the victoric joint 14 shown in FIG. 2 is that the outer ring 12 of the metal ring 10 projects to the outside of the outer peripheral surface of the hose body 1 and the housing 16. The gap between the pipe and the hose connected to each other is absorbed by the gap between the pipe and the hose and / or the gap between the two ready-mixed concrete hoses (the gap between the metal rings 10 facing each other). The point is that stable airtightness can always be maintained.

Although the raw concrete pouring hose expands and contracts and bends due to pulsation, it is generally flexible and the end on the discharge side is open, so there is little effect on the connection part, but in addition to these expansions and bends The above characteristics of the Victaulic type joint are important because there is also the effect of bending due to movement. Therefore, in order to exert the expansion / contraction and flexure absorption effects of the Victaulic type joint, as shown in FIG. 2, the outer peripheral surface of the outer ring 12 forms a step from the outer peripheral surface of the hose body 1 and projects outward. It is necessary. Further, the outer ring 12 has an outer shape and a width which are of course adapted to the victor type joint to be used.

The metal ring according to the present invention has a simple structure and is inferior in pressure resistance as compared with the conventional general joint fitting as shown in FIG. Since the hose for use is on the open end side, the internal pressure is low, about 5 kgf / cm ² or less, so it will not come off from the hose body even when it is used in the state of being connected by a victor joint. In addition, the metal ring has a simple structure and is lightweight, so that it does not hinder the handling at the time of placing.

[0020]

【Example】

 The rubber hose for pouring fresh concrete shown in FIG. 1 was manufactured as described below. That is, an inner rubber layer 2 made of abrasion-resistant natural rubber and having a thickness of 3 mm is provided on the mandrel, and a reinforcing wire 4 made of SW-8 having a thickness of 2.6 mm is spirally formed on the outer periphery of the inner rubber layer 2. Wrapped around. After providing an intermediate rubber layer made of natural rubber having a thickness of 1 mm between the reinforcing wires 4, a nylon fiber blind cord 5 is spirally wound, and a monofilament cord 6 made of a nylon thread is wound on the spirally wound cord. It was wound between 4 and the single fiber cord 6 was pressed. Finally, apply a 2 mm thick outer rubber layer 3 made of natural rubber, put the whole in a vulcanization can and vulcanize it under normal conditions, then pull out the mandrel and pull out the 8 m long hose body 1 with an inner diameter of 90 mm. Got

On the other hand, as the metal ring 10, an inner ring 11 and an outer ring 12 made of STKM 13A were manufactured. The inner ring 11 has an inner diameter of 86 mm and an outer diameter of 90 mm, and has a flange portion 13 protruding outwardly by a width of 5 mm from one edge of a cylinder having a length of 20 mm, and the outer ring 12 has an inner diameter of 106 mm, an outer diameter of 110 mm and a length of 16 mm. It has a collar portion 13 protruding inward from the one end edge of the cylinder by a width of 4 mm. The inner ring 11 is inserted into the inner peripheral surfaces of both ends of the hose body 1 and the outer ring 12 is inserted into the outer peripheral surface of the hose body 1, and the inner diameter of the inner ring 11 is matched with the inner diameter (90 mm) of the hose body 1. The metal rings 10 were fixed to both ends of the hose body 1 by expanding the diameter up to.

The ends of the two ready-mixed concrete hoses thus obtained are made to face each other, and as shown in FIG. 2, the S-1 type Victoria joint 14 ( It was connected by making a conclusion with Nippon Vitric Co., Ltd.). That is, after the rubber ring 15 was fitted on the outer ring 12 of the metal ring 10, the housing 16 divided into two was covered from above, and the divided portions of the housing 16 were fastened with bolts and nuts, respectively.

Out of the two connected raw concrete casting hoses, the unconnected end of one hose was connected to the transfer steel pipe using a victor joint as in the above. Using a normal piston type pump, 65 m ³ / hr of raw concrete was placed at a pressure of 30 kgf / cm ² , but there was no problem with the pressure resistance of the two connected raw concrete placing hoses, and it was very easy to use. It was

[0024]

[Effect of the device]

 According to the present invention, two or more of the ready-mixed concrete placing hoses can be simply connected to each other by a simple means, and further, local wear due to the deformation of the discharge side end of the ready-mixed concrete placing hose or from the end surface. Since the reinforcement wire can be prevented from protruding, it is possible to provide a hose for placing ready-mixed concrete that can be used with confidence for a longer period than before.

[Brief description of drawings]

FIG. 1 is a side view showing a specific example of a fresh concrete placing hose of the present invention, showing an upper half in cross section.

FIG. 2 is a cross-sectional view showing a state in which two ready-mixed concrete placing hoses of the present invention are connected by a victor joint.

FIG. 3 is a cross-sectional view showing a conventional ready-mixed concrete placing hose.

[Explanation of symbols]

 1 Hose Main Body 2 Inner Rubber Layer 3 Outer Rubber Layer 4 Reinforcing Wire 5 Fiber Braid Cord 6 Single Fiber Cord 7 Inner Cylinder Insert Metal Fitting 8 Outer Cylinder Sleeve Metal Fitting 9 Annular Projection 10 Metal Ring 11 Inner Ring 12 Outer Ring 13 Collar 14 Victory joint 15 Rubber ring 16 Housing

Claims (2)

[Scope of utility model registration request] 1. A rubber or plastic hose body having a reinforcing wire spirally wound inside, and an inner ring and an outer peripheral surface which are attached to both ends of the hose body and cover an inner peripheral surface of the end. A metal ring made of an outer ring, and a collar portion protruding outward from an end edge of the inner ring on the hose body end side and / or a collar portion protruding inward from an end edge of the outer ring on the hose body end side. The integrally molded hose is formed so as to integrally cover the end surface of the hose body, and the outer peripheral surface of the outer ring forms a step from the outer peripheral surface of the hose body to project outward. 2. The raw concrete casting hose according to claim 1 is made to have its end portions opposed to each other, and a victoric joint is fastened to the outer peripheral surface of a metal ring attached to each of the opposed end portions, whereby 2 The hose for placing ready-mixed concrete according to claim 1, wherein two or more books can be connected to each other.