JPH01247699A - Tube body for grout - Google Patents

Abstract

PURPOSE:To suppress expansion and deformation, prevent the occurrence of cracks, and improve the yield strength of a tension steel by forming peripheral projections and ridge-shaped projections on a tube body for grout used for the underground installation of the tension steel and arranging reinforcing materials. CONSTITUTION:When an anchor is to be installed, a tension steel P is stored in a tube body 1 for grout, it is inserted into a hole dug in the ground, mortar or the like is injected to the inside and outside of the tube body 1 before or after it. Many peripheral projections 2 are protruded spirally or in a collar shape in the circumferential direction on the outside of this tube body 1, one or multiple continuous linear ridge-shaped projections 3... are protruded in the lengthy direction. Multiple reinforcing materials 4... are linearly buried on wall bodies 31 of the ridge-shaped projections 3... over the whole length of the tube body 1. The firm resistance against the strong tensile force can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a grouting tube used for fixing anchors or introducing prestress into structures.

<Prior Art> A method is known in which a tensile steel material is inserted into a hole drilled underground, and mortar or the like is injected into the hole after or before insertion to fix the tip of the steel material.

In this case, instead of directly inserting the tensile steel material into the hole, a method has been developed in which the periphery of the tensile steel material is covered with a tube made of steel or synthetic resin.

However, since the surface of a normal pipe has a small coefficient of friction, the resistance to fixation of the tensile steel material becomes small.

Therefore, as shown in Fig. 3, on the surface of the grouting tube A,
A construction method has been developed in which an annular band B is provided protruding in the circumferential direction to increase resistance.

<Problems with the Prior Art> As described above, the grout tube A provided with the conventional annular body B can certainly increase the anchoring resistance of the tensile steel material.

However, when tensile force or large grout injection pressure is applied, especially when applying tensile force, it is undeniable that elongation and deformation will occur in grout tube A, which is formed only from annular body B. do not have.

At 11 degrees Celsius, the grout tube A provided with the annular body B has a large fixing resistance, so if it stretches or deforms, it will damage the tube itself and the grout material inside and outside! The rack does not occur.

In particular, as shown in FIG. 3, cracks C are likely to occur near the free length of the tensile steel material.

As a result, the effect as a rust preventive film is lost, and a problem arises in the yield strength of the tensile copper material.

・Purpose of the present invention> The present invention was made in order to improve the shortcomings of the prior art such as Kitami, and it is possible to sufficiently take frictional resistance with mortar etc., and when tensile force etc. An object of the present invention is to provide a grouting tube that can prevent the occurrence of cracks.

Structure of the Present Invention> Next, embodiments of the present invention will be described using the construction of an anchor as an example, but it goes without saying that the present invention can be similarly utilized in the construction of other structures.

<A> Overall structure A PC steel wire, for example, as the tensile steel material P is stored inside the grouting tube 1, inserted into the hole, and mortar etc. are applied to the inside and outside of the tube 1 before or after insertion. The method of injecting is similar to the construction method of conventional anchors.

<Opening> Structure of Tube (FIG. 1) The tube 1 of the present invention is a cylinder made of known materials such as synthetic resin, metal, aramid fiber, carbon fiber, and glass fiber.

One end (inner end) of this tubular body 1 is configured to be closed or open, and the other end (inlet end) is open.

A circumferential protrusion 2 in the circumferential direction and a peak-shaped protrusion 3 in the longitudinal direction are protruded from the tube body 1.

Kuha〉Circumferential protrusion (Fig. 1.2) A large number of circumferential protrusions 2 protrude in the circumferential direction of the tube body 1.

This circumferential protrusion 2 may be formed on the entire tube body 1 from the back end to the inlet end, or may be formed only on half or a part of the tube body 1.

The circumferential projection 2 shown in FIG. 1 is a continuous spiral projection.

However, the object of the present invention can be achieved by arranging a large number of flange-like protrusions in parallel in each circumferential direction in an independent state and forming protrusions that are not continuous in a spiral shape.

Further, the same objective can be achieved even when a large number of protrusions are provided in a gear-like manner so as not to be continuous 360 degrees in the circumferential direction, that is, discontinuously.

2) Ridge-like projection (Fig. 1.2) Parallel to the longitudinal direction of the tube 1, over the entire length of the tube 1,
One or more continuous linear protrusions are protrudingly provided as peak-like protrusions 3.

<E> Reinforcing material (FIG. 2) A plurality of reinforcing materials 4 are buried in a straight line within the wall 31 of the peak-like projection 3 over the entire length of the tube body 1.

The reinforcing material 4 is embedded in the wall 31 of the peak-like projection 3 in advance when the tube body 1 is formed.

This reinforcing material 4 is made of a high-strength fiber material or wire material such as carbon fiber.

Therefore, even when a tensile force or the like is applied to the tensile waste material P, the elongation and deformation of the tube body 1 can be suppressed to a minimum due to the resistance force of the high-strength reinforcing material 4 in a straight line state.

Now, if we consider a case where a reinforcing material is embedded into the wall along the irregularities of the circumferential projection 2 without protruding the peak-like projection 3, in this case the reinforcing material will be in a straight line. Instead, it becomes uneven and wavy.

Therefore, when a tensile force is applied to the reinforcing material, a force is exerted on the reinforcing material to return it from a wavy shape to a straight line, but it is not possible to obtain sufficient resistance against the tensile force or the like.

That is, since the reinforcing material exhibits resistance against tensile force etc. only when it is in a straight line, when the reinforcing material is embedded along the unevenness of the circumferential protrusion 2, the This means that the effect of suppressing elongation and deformation is extremely low.

Also, when the reinforcing material tries to return from a corrugated state to a straight state,
Since the reinforcing material buried in the convex portion tends to move in the axial direction of the tube body 1, depending on the magnitude of the tensile force, it is possible that the tube body l and internal grout may be damaged and cracks may occur.

From the above, it can be seen that the present invention, in which the reinforcing material 4 can be embedded in a straight line, can exhibit sufficient resistance against tensile force and the like.

<Effects of the Present Invention> Since the present invention is as described above, the following effects can be expected.

B) Conventional grout tubes formed only from annular bodies may elongate or deform when tensile force is applied to them.

As a result, cracks are likely to occur in the pipe body itself and the grout materials inside and outside, and the effect as a rust preventive film is lost, causing problems in the yield strength of the tensile steel material.

In contrast, the present invention provides linear peak-like protrusions that extend in the longitudinal direction over the entire length of the tubular body on which the circumferential protrusions are formed, and embeds a reinforcing material linearly within the wall of the protrusions. It was composed of

Therefore, even when a tensile force or the like is applied, the elongation and deformation of the tube can be suppressed to a minimum due to the resistance of the high-strength reinforcing material.

Therefore, it is possible to prevent cracks from occurring in the tubular body itself and the inner and outer grout materials, and to increase the yield strength of the tensile steel material.

<Port> By embedding reinforcing material, elongation and deformation of the tube can be suppressed to a minimum, making it possible to inject grout with high injection pressure.

Therefore, a grout that is dense and has high strength can be obtained.

Furthermore, since the grout can be applied densely and with high strength, it is possible to prevent the occurrence of cracks.

<C> Since a large number of circumferential protrusions are formed to protrude from the circumferential surface of the tubular body, a sufficiently large frictional resistance with mortar etc. can be obtained.

The above explanation has been given using the anchor construction method as an example, but it can also be used to introduce prestress into structures such as bridges, nuclear reactors, and oil tanks.

Furthermore, it can be used not only for prestressed structures but also for construction of structures using general reinforcing bars.

[Brief explanation of the drawing]

1st N: Side view of the tube body of the present invention Figure 2: Its end view. Figure 3: Illustration of conventional construction method

Claims (1)

[Claims] (1) A tube body placed around steel material for injecting mortar, etc., with circumferential protrusions formed in multiple stages in the circumferential direction of the tube body and continuously formed in the longitudinal direction of the tube body. A tubular body for grouting, characterized by comprising a linear peak-like projection and a reinforcing material embedded linearly within the wall of the peak-like projection.