JP2987319B2 - Grout hole in concrete segment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grout hole of a concrete segment for tunnel lining.

[0002]

2. Description of the Related Art A grout injection hole for backfilling a concrete segment is required for tunnel lining, and a female screw tube for screwing a suspending fitting used at the time of assembling is provided substantially at the center of the segment. The female screw tube forms a grout hole which also serves as a grout injection hole for backfilling.

[0003] In the conventional concrete segment, a steel pipe is exclusively used as a female screw pipe, and a steel pipe in which a thread is formed on an inner surface and an anchor bar is welded to an outer surface is buried in the concrete segment to form a grout hole. I have.

[0004]

In a conventional grout hole formed by burying a steel pipe, (1) it is necessary to weld an anchor bar to the steel pipe in order to improve the adhesion between the steel pipe and concrete, which is troublesome. (2) Steel pipes are easily corroded and rust is generated. (3) Electric corrosion is easily generated in the steel pipe by electricity. There is such a problem.

The present invention has been made to solve these problems.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a female threaded pipe is provided with a threaded synthetic resin pipe having a thread corresponding to the inner face not only on the inner face but also on the outer face .
Attach a synthetic resin stopper to one end of the synthetic resin pipe by screwing
Attach a synthetic resin megaphone at the other end
Thus, a synthetic resin assembly is formed, and the synthetic resin assembly is buried in a concrete segment to form a grout hole.

That is, the present invention relates to a " screw having a multi-start thread
A thread is formed on the inner surface so that the outer surface corresponds to the thread on the inner surface.
Formed to form threads slightly larger in diameter than the threads
Threaded Synthetic Resin Tube with Threads of Nearly Constant Thickness
Attach a synthetic resin stopper to one end of
Synthetic resin set with resin-made megaphone attached by fitting
Three-dimensional, synthetic resin stopper is inside the concrete segment
Side of the concrete segment in the thickness direction
A grout hole for a concrete segment, which is buried along and forms a cavity having a female screw tube . ". By embedding the threaded synthetic resin pipe of the present invention to form a female thread pipe, (1) the thread is exposed as it is on the outer surface of the female thread pipe, and concrete is filled into the irregularities of the thread. Therefore, a sufficient adhesive force between the female screw pipe and the concrete is secured, and the use of the anchor bar is unnecessary. Moreover, the threaded portion of the female screw tube is reinforced by the hardened concrete. (2) Female thread tube and Megaho
Since both of the plastics are made of synthetic resin , there is no concern about rust or electrolytic corrosion. The effect is brought about.

However, since the thread of the synthetic resin pipe is not so sharp, there is a concern that the screwing force may be insufficient with a normal single thread. Therefore, it is necessary to use two to four threads.

[0009] One end attached by screwing the plastic plug in (inner surface side of concrete segment) of screws threaded plastic pipe in the present invention, the synthetic resin megaphone-like material on the other end (the outer surface side of the concrete segments) A synthetic resin assembly is made by fitting, and the assembly is buried along the thickness direction of the concrete segment to form a grout hole .

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows an example of a synthetic resin molded article which is buried in a concrete segment to form a grout hole according to the present invention. FIG. 1 (a) is a perspective view of an example of a synthetic resin pipe having a thread, and FIG. b) is a perspective view of an example of a synthetic resin stopper,
(C) is a perspective view of an example of a synthetic resin megaphone, (d)
FIG. 4 is a cross-sectional view of an example of an attachment portion of a synthetic resin megaphone-like object to a threaded synthetic resin tube.

FIG. 2 is a sectional view of an example in which the assembly of the synthetic resin molded products shown in FIG. 1 is buried along the thickness direction of the concrete segment to form a grout hole.

In this example, the threaded synthetic resin tube 1 is composed of a threaded portion 3 of a triple-threaded screw having a thread formed spirally from one of thread start points 2a, 2b, 2c at one end, and a circular tube portion and a conical portion subsequent thereto. 5, a convex portion 4 is provided on the outer surface of the circular tube portion, and the conical portion 5 is formed in a shape cut into a cross shape.

The synthetic resin stopper 6 is formed of a disk 6a and a threaded portion 6b of a triple thread.

The synthetic resin megaphone 7 is formed into a diverging megaphone shape, and a concave groove 7a is provided on the inner surface of the base.

Using these three types of synthetic resin molded products, a synthetic resin stopper 6 is screwed into the threaded synthetic resin tube 1, and a concave groove 7a of the synthetic resin megaphone 7 is threaded. A synthetic resin assembly is made by fitting the protrusions 4 on the outer surface of the cylindrical portion of the resin tube 1.

In manufacturing the concrete segment 10,
This assembly is buried approximately in the center of the concrete segment 10 along the thickness direction. In this embedding, usually, both ends of the assembly are designed to be covered with thin concretes 8 and 9 instead of being exposed on the surface of the concrete segment 10. It may be embedded so as to be exposed. Further, a thin mortar may be used instead of the thin concretes 8 and 9.

The formed grout hole is used as follows.

(1) In assembling the concrete segment, after removing the thin concrete 8 on the inner surface side, the synthetic resin stopper 6 is turned and removed, and the tip of the assembling hanger is screwed into the trace. After the assembling is completed and the assembling hanger is removed, the synthetic resin stopper 6 is screwed again. However, if the backfill material is to be injected immediately after assembly, leave it removed.

(2) The plug 6 made of synthetic resin is removed, the impact is applied to the thin concrete 9 on the outer surface side with an appropriate tool to break the concrete, and the backfill material is injected. Each cross-cut piece of the conical portion 5 of the threaded synthetic resin tube 1 prevents backflow of the backfill material, and the synthetic resin megaphone-like material 7 functions to facilitate smooth filling of the backfill material.

[0021]

The present invention has the above-described structure and has the following effects.

(1) The screw thread is exposed as it is on the outer surface of the female screw pipe, and concrete is filled in the unevenness of the screw thread, so that a sufficient adhesive force between the female screw pipe and the concrete is ensured and the anchor is secured. The use of muscle is not required. Moreover,
The thread of the female thread tube is reinforced by hardened concrete.

(2) The female screw tube and the megaphone-like material are
Since it is made of a synthetic resin , there is no need to worry about rust or electrolytic corrosion.

[Brief description of the drawings]

FIG. 1 shows an example of a synthetic resin molded product embedded in a concrete segment to form a grout hole;
(A) is a perspective view of an example of a synthetic resin tube with a thread, (b) is a perspective view of an example of a synthetic resin stopper, (c) is a perspective view of an example of a synthetic resin megaphone, and (d) is a perspective view. It is sectional drawing of the example of the attachment part of the synthetic resin megaphone-like thing to the synthetic resin pipe with a thread.

FIG. 2 is a cross-sectional view of an example in which a grout hole is formed by embedding an assembly of synthetic resin molded products along the thickness direction of a concrete segment.

[Explanation of symbols]

1 ... Synthetic resin tube with thread, 2a, 2b, 2c ... Thread start point, 3 ... thread part, 4 ... convex ridge, 5 ... conical part, 6 ... synthetic resin stopper, 6a ... ... disk, 6b ... thread part, 7 ... megaphone made of synthetic resin, 7a ... concave groove, 8
...... Inner side thin concrete, 9 ... Outer side thin concrete, 10 ... Concrete segment.

Claims (1)

(57) [Claims] An inner surface forms a thread of a multi-start thread, and an outer surface
Is slightly larger than the inner thread corresponding to the inner thread
An approximately constant thickness thread formed to form a thread with a diameter
Attached by screwing at one end to plastic stoppers threaded synthetic resin tube with a di-ridges, attached by fitting synthetic resin megaphone-like material on the other end, a synthetic resin assembly, synthetic resin
So that the stopper is on the inside of the concrete segment,
A grout hole for a concrete segment, which is embedded along the thickness direction of the concrete segment to form a cavity having a female screw tube.