JPH01223215A - Tube body for grouting - Google Patents

Abstract

PURPOSE:To prevent the remaining of air and breezing water by accommodating a steel member into a tube body having projections in the circumferential direction and longitudinal direction and inserting said tube body into a hole and pouring mortar, etc., in the fixation of anchors, etc. CONSTITUTION:A spiral-shaped circumferential projection 2 is formed in the circumferential direction onto a tube body 1 made of synthetic resin, metal, etc., and a continuous ridge-shaped projection 3 is formed in the longitudinal direction. A pulling steel member P is accommodated inside the tube body 1 and inserted into a hole drill under the ground, and fixation is carried out by pouring mortar from the top edge of an injection pipe having a thin diameter which is inserted into the innermost part of the tube body 1. Therefore, the air and breezing water in the tube are pushed out through the ridge-shaped projection 3, and remaining is prevented.

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> With the structure of the known grout tube, the air and breathing water inside cannot be sufficiently discharged when the mortar poured into the tube rises.

For example, if the hole is vertical, there will be less problem because the mortar will rise from below and the air and breathing water inside will be pushed up sequentially along the annular zone.

However, in reality, construction is often done diagonally.
Depending on the conditions, it may be constructed horizontally or even upwards.

In this case, if the grout is pushed out from the inside, the air and breathing water W luitance inside the grout tube A will be stored on the upper side of the annular band B and come out to the outside, as shown in Figure 4. row (can't do it)

As a result, even if a pipe body having a shape with a large resistance is used, a large number of air pockets and breathing water pockets remain, which leads to a decrease in strength.

<Objectives of the Present Invention> The present invention has been made in order to improve the drawbacks of the conventional techniques as described above, and an object of the present invention is to provide a grouting tube as described below.

<A> A grouting tube that can sufficiently take the frictional resistance between the tube and the mortar. A grout tube that can be discharged to the outside <Structure of the present invention> Next, an embodiment of the present invention will be described in connection with the construction of an anchor, but it is of course applicable to the construction of other structures as well. .

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

<Opening> Structure of Tube (FIG. 1) The tube 1 of the present invention is a cylindrical body 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.

The tubular body 1 has a structure in which a circumferential protrusion 2 in the circumferential direction and a sieve-like protrusion 3 in the longitudinal direction are protruded.

<C> Circumferential protrusion 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 it 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 even with a protrusion that is not continuous in a spiral shape and is constructed by arranging a large number of independent flange-like protrusions in parallel in each circumferential direction.

Furthermore, the objective can be achieved in the same manner even if a large number of protrusions are provided protrudingly in a gear-like manner that is not continuous 360 degrees in the circumferential direction, that is, discontinuously.

<2> Phloem-like projection One or more continuous projections are continuously provided as the cribriform projection 3 in parallel with the longitudinal direction of the tube body 1 .

This sieve-like projection 3 acts as a passage for exhaust and drainage.

Therefore, the starting end of the cribriform process 3 starts near the inner end of the tubular body 1.

The terminal end of the cribriform projection 3 is continuously open to the inlet side end of the tube body 1.

<Detailed description of the present invention> Next, the usage status will be explained.

<A> Mortar injection A tensile steel material P is stored inside the tube l, and mortar, cement paste (hereinafter referred to as "mortar"), etc. are injected inside.

Mortar is injected by inserting a small-diameter injection pipe to the innermost part of the tubular body 1 and discharging mortar from its tip.

Therefore, the mortar starts to be poured from the innermost part of the tube body 1 and gradually advances toward the hole side.

The same applies even when mortar is directly injected using the tube body 1 of the present invention without using an injection pipe.

<Mouth> Posture of the tube body When pouring mortar into the tube body 1, the posture in which the tube body 1 is laid down is important in order to expel air and water.

That is, in the case of the tube body 1 of the present invention, a plurality of cribriform projections 3
It is important to always position one of them facing upward.

However, when a large number of cribriform projections 3 are formed, there is no need to be very careful.

<C> Exhaust and Drainage As the mortar progresses, the air and water inside the pipe body 1 as a whole are discharged toward the entrance side of the pipe body 1.

However, as explained in the section on the problems of the prior art, the air and water that have accumulated deep inside the circumferential protrusion 2 cannot be discharged ((especially the air and water that remains above it are prevented from rising, so they remain as they are). It will remain.

However, the tubular body 1 of the present invention has a sieve-like projection 3 continuous in the longitudinal direction, which is located on the upper side.

Therefore, air and water do not accumulate deep inside the circumferential protrusion 2.

The water is sequentially pushed out through the sieve-like protrusion 3 serving as an exhaust passage and a drainage passage, and is sequentially discharged from the inlet side end of the tube body 1.

<Effects of the Present Invention> As described above, the present invention has a corrugated shape that has a large resistance to the surroundings, and solves the problems of drainage and exhaust, which are likely to be disadvantages of the corrugated shape.

Therefore, the following effects can be expected.

(A) Since a large number of circumferential protrusions are formed to protrude from the circumferential surface of the tube, a sufficiently large frictional resistance with mortar etc. can be obtained.

<Mouth> A sieve-like protrusion that serves as an exhaust passage and a drainage passage that continues in the longitudinal direction is provided over the entire length of the pipe body.

Therefore, air and breathing water that tend to accumulate on the upper side of the circumferential protrusion during mortar pouring can be completely discharged.

<C> Although the method for constructing anchors has been explained above as an example, it can also be used to introduce prestress into structures such as bridges, nuclear reactors, sewage treatment tanks, and building structures.

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]

Figure 1.2 Side view of the tube body of the present invention. Figure 2: Its end view Figure 3: Illustration of conventional construction method Figure 4: Illustration of problems with conventional construction methods Yoshikatsu Osawa

Claims (1)

[Claims] (1) A tube body for injecting mortar etc. placed around a steel material, which has multiple stages of circumferential protrusions in the circumferential direction of the tube body, and at least one continuous protrusion in the longitudinal direction of the tube body. Grout tube with a single peak-like protrusion