JPH06108464A - Pipe body for grouting - Google Patents

Abstract

PURPOSE:To restrain expansion and contraction of a spiral protuberance, and to join a front end cap or a trumpet sheath pipe easily and certainly. CONSTITUTION:A pipe body positioned around steel materials for injecting mortar or the like is made up of a spiral protuberance 1, made up in a plurality of stages in the circumferential direction of the pipe body, straight-line grooves 2 formed continuously in the longitudinal direction of the pipe body and is having the bottom diameter the smaller than the outer diameter on trough parts 12 of the aforementioned protubernace, and reinforcing materials embedded in straight lines on thick parts on the bottoms of the grooves. The reinforcing materials are buried continuously or disconnectedly along ridge parts 11 of the spiral protuberance. The reinforcing materials 3 are further buried spirally along the trough parts of the spiral protuberance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grout tube used for anchoring anchors or introducing prestress to a structure.

[0002]

2. Description of the Related Art There is known a method in which a tensile steel material is inserted into a hole drilled in the ground, and mortar or the like is injected into the hole after or before the insertion to fix the tip portion of the steel material.
In that case, instead of inserting the tensile steel material directly into the hole, a method has been developed in which the surrounding area is covered with a tube body made of steel or synthetic resin. Fig. 4 shows Japanese Patent Application No. Sho 63-73.
It is an invention according to No. 110, and is a tube for grout used in the above-mentioned construction method. In the case of the present invention, the circumferential protrusion b is attached to the tubular body a.
And a linear protrusion d in which a reinforcing material c is embedded linearly. Here, the circumferential protrusion b has an effect of increasing the frictional resistance with the grout filled in the hole, and the reinforcing material c causes the circumferential protrusion b to stretch and crack or deform when tensioned. It has an effect of suppressing the phenomenon caused by the resistance.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
There are the following problems. That is, the grout tube is generally open at both ends or one end.
Therefore, it is necessary to join a member such as a tip cap or a trumpet sheath tube to the tip end side or the tail end side of the tubular body in order to secure water blocking performance. Therefore, for a spiral tube body, a tip cap or the like having a similar spiral joint portion is used, and by screwing it in, a highly water-proof joint can be achieved. However, the one having the linear projection d as described above has a drawback that the linear projection d becomes a hindrance, screw connection is not possible, and special processing is required to secure the waterproofness. . For example, there is a means of securing the waterproof property by fitting the tip cap inside the sheath tube. In this case, a straight portion is provided at the joint portion of the tip cap with the sheath tube. Special processing such as installation is required. Therefore, there is a drawback in that such special processing requires labor and costs are increased.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and can suppress the expansion and contraction of the spiral projections, and further, existing tip caps, trumpet sheath tubes, etc. It is an object of the present invention to provide a tube body for grout which can easily and surely join together. That is, the present invention is a pipe body for pouring mortar or the like located around a steel material, wherein a spiral protrusion formed in a plurality of stages in the circumferential direction of the pipe body and a continuous pipe in the longitudinal direction of the pipe body. Formed by a linear groove having a bottom outer diameter equal to or smaller than the valley outer diameter of the protrusion, and a reinforcing material linearly embedded in the bottom thick portion of the groove. It is a pipe for.
In addition, the reinforcing material is embedded in a spiral shape continuously or intermittently along the peaks of the spiral protrusion, and further, the reinforcing material is embedded in a spiral shape along the valley portion of the spiral protrusion. Is a tube for grout.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The embodiment of the present invention is used as an anchor.
The construction will be described as an example, but it goes without saying that it can be similarly used for construction of other structures. <B> Structure of tubular body The tubular body is a tubular body formed of a known material such as synthetic resin, metal, aramid fiber, carbon fiber, and glass fiber.
The tubular body is provided with a spiral projection 1 in the circumferential direction and a linear groove 2 in the axial direction.

<B> Spiral projections A large number of spiral projections 1 are provided in the circumferential direction of the tubular body. The spiral protrusion 1 is composed of a mountain portion 11 and a valley portion 12, and may be formed over the entire length from the tip to the tail end of the tubular body, or may be formed in a part thereof.

<C> Linear Grooves One or a plurality of linear grooves 2 are provided as recesses continuously in the axial direction of the entire length of the tubular body. The bottom thick portion 21 of the linear groove 2
Is equal to the outer diameter of the valley 12 of the spiral protrusion 1,
It is formed smaller than that. By providing the linear groove 2 in this way, the spiral projection 1 becomes discontinuous.

<D> Linear Reinforcing Material In the thick wall portion 21 of the linear groove 2, a linear reinforcing material 3 is embedded in the axial direction over the entire length of the tubular body. The embedding of the reinforcing material 3 is performed when the tubular body is formed in advance, when the bottom thick portion 2 is formed.
It is embedded in 1. As the material of the reinforcing material 3, a wire material such as steel material or high strength fiber material such as carbon fiber is used. When burying the linear reinforcing material 3, the bottom thick portion 21 of the linear groove 2 may be formed thicker.

<V> Spiral Reinforcing Material As shown in FIG. 2, the spiral reinforcing material 4 is embedded in the mountain portion 11 of the spiral protrusion 1. This reinforcing material 4 may be provided intermittently only on the mountain portion 11, or may be bent and embedded in the thickness of the linear groove 2 and continuously provided. Further, as shown in FIG. 3, also in the valley portion 12 of the spiral protrusion 1, the reinforcing material 5 continuous in a spiral shape is embedded. The material and the embedding method of these reinforcing materials 4 and 5 are the same as those of the reinforcing material 3.

[0010]

Since the present invention is as described above, the following effects can be obtained. <A> The tubular body of the present invention is configured by embedding the linear reinforcing material in the groove instead of embedding it in the protrusion as in the conventional case. Therefore, a screw-like spiral protrusion is formed on the peripheral surface of the pipe body, and can be screwed to a member such as the tip cap or the trumpet sheath pipe. Therefore, it has a versatility that the water tightness can be secured by the screw connection and that the existing tip cap or the like that does not require special processing can be used. Therefore, the joining work becomes easy, and the cost can be reduced.

<B> Even when a tensile force is applied to the tensile steel material, the elongation and deformation of the tubular body can be suppressed to a minimum by the resistance force of the high-strength reinforcing material in a straight state. Therefore, it is possible to prevent cracks from occurring in the tube itself and the inner and outer grout materials, and improve the yield strength of the tensile steel material.

<C> In addition to the effect of the linear reinforcing material, the mountain reinforcing material can prevent the tube mountain portion from being crushed by the compressive force from the surroundings. In addition, the trough reinforcing material can prevent expansion damage of the tubular trough due to internal grout injection pressure or the like.

<D> Since the expansion and deformation of the pipe body can be suppressed to a minimum by embedding the reinforcing material, it becomes possible to inject the grout material with a large injection pressure. Therefore, a solid and high-strength grout can be obtained. Furthermore, since the grout can be applied with solid and high strength, it is possible to prevent the occurrence of cracks.

<E> Since a large number of spiral projections are formed on the circumferential surface of the tubular body, it is possible to obtain a sufficiently large frictional resistance against mortar and the like.

<F> In the above description, the anchor construction method has been described as an example, but it can also be used when introducing prestress to a structure such as a bridge, a nuclear reactor or an oil tank. Further, it can be used when constructing a structure using general rebar instead of the prestressed structure.

[Brief description of drawings]

FIG. 1 is a sectional perspective view of a tube body for grout of the present invention.

[Figure 2] Cross section of mountain

[Fig. 3] Cross section of the valley

FIG. 4 is an explanatory diagram of a conventional technique.

Claims (3)

[Claims] 1. A pipe body for pouring mortar or the like around a steel material, comprising: spiral protrusions formed in a plurality of stages in the circumferential direction of the pipe body, and continuous in the longitudinal direction of the pipe body. A tube body for grout, which is formed by a linear groove having a bottom outer diameter that is equal to or smaller than a valley outer diameter of the protrusion, and a reinforcing material that is linearly embedded in a thick wall portion at the bottom of the groove. 2. The grout tube according to claim 1, wherein a reinforcing material is embedded in a spiral shape continuously or intermittently along the ridges of the spiral protrusions. 3. The grout tube according to claim 1, wherein a reinforcing material is embedded in a spiral shape along a valley portion of the spiral protrusion.