JPS6375295A - Grout hole of concrete structure - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention "Field of Industrial Application" The present invention is provided in, for example, concrete segments, box culverts, humid pipes, etc., and is mainly used as a hole for filling with backfilling material or attaching a hanging fitting. It concerns grout holes in concrete structures.

``Prior Art'' The shield method or propulsion method has been generally applied as an effective means of constructing tunnels. In this type of construction method, cement milk and other materials are grouted to fill the gaps between the concrete structure and the ground. A grout hole is formed in the center of the object and extends through its thickness.

Conventionally, this grout hole was formed by embedding a steel pipe with a female thread formed in the inner layer at one end for screwing a hanging fitting, socket, etc., and by welding anchor bars to the outer periphery of the vibrator, the pipe could be removed. Generally, a water stop plug or the like is screwed onto the female thread to seal the grout hole.

"Problems to be Solved by the Invention" The present invention attempts to solve the following problems in the prior art described above.

■ Conventional grout holes are through-holes that penetrate through the thickness of a concrete structure, so the grout material injected into the grout hole is ejected directly into the ground through this grout hole. Other mountains around the grout hole will be excavated due to this.

■ In places where there is a strong backflow of muddy water caused by groundwater that collects behind concrete structures, grouting work after removing the water stopper plug is troublesome and work efficiency is poor.

■ When attaching a hanging metal fitting to a grout pole, a special socket is required to make the hanging metal fitting into an external fitting structure, which is difficult to work with and is likely to cause damage due to stress being concentrated on the socket.

Therefore, according to the present invention, grouting material can be injected without drilling other holes, and backflow of muddy water can be minimized during grouting work. The purpose of the present invention is to provide a grout hole for concrete structures that eliminates the need for grout holes and improves workability and reliability.

"Means for Solving the Problems" The present invention provides a grout hole that communicates with the inner and outer surfaces of a concrete structure with a double pipe structure consisting of an inner pipe and an outer pipe,
and the inner tube is configured to be movable in the axial direction relative to the outer tube,
A valve is provided at the outer end of the inner tube to open and close the outer end opening of the outer tube by moving the inner tube in the axial direction, and a valve is provided near the valve of the inner tube to open and close the opening at the outer end of the inner tube. It is characterized by having a side opening that opens only when moving.

"Function" In a grout hole having such a configuration, when the inner pipe is moved in the axial direction, the grout hole is opened and closed depending on the relationship between the valve and the side opening. In addition, the so-called exit side of the grout hole has a side opening like this, and the grout material discharged from here flows out along the outer surface of the concrete structure and flows into the gap between the concrete structure and the ground. Since the grout hole is filled with grout, other surrounding mountains facing the grout hole will not be excavated by the injection of grout material.

"Embodiment" Hereinafter, one embodiment of the present invention will be described with reference to the drawings. Fig. 1 shows a cross-sectional view of the main part of a grout hole to which the present invention is applied. The grout hole 3 is a valve for opening and closing the grout hole 2.

Next, to explain these in detail, when the concrete structure l is a segment used for constructing a tunnel or the like, the entire concrete structure l is formed in the shape of an arcuate plate curved toward the inner surface la side with a certain curvature, A joint fitting (not shown) having a bolt fastening structure is embedded in the surrounding joint surface.

The grout hole 2 has a cylindrical inner pipe 4 and an outer pipe 5.
It has a double tube structure consisting of. The outer tube 5 is a structure l
It is fixed to, for example, an anchor muscle, and a female screw 5a is formed on the entire inner circumferential surface thereof, and further,
An annular flange plate 6 is provided on the outer periphery of the end of the outer tube 5 on the outer surface lb side of the structure l. A ring-shaped packing 6a is attached to the surface of the flange plate 6 (the surface on the outer surface 1b side).

A male thread 4a is formed on the outer circumferential surface of the inner tube 4 to be screwed into the female thread 5a of the outer tube 5, so that when the inner tube 4 is rotated around its axis, the outer tube 5 In contrast, it is configured to be movable in the axial direction.

The length of the inner tube 4 is approximately equal to the thickness T of the structure 1, but the outer tube 5 is formed shorter than that. That is,
A cylindrical recess 7 having a larger diameter than the outer tube 5 and coaxial with the outer tube 5 is formed on the inner surface la side of the structure 1. is formed with a short length. Therefore, one of the inner tubes 4 has a configuration in which the inner end side of the male thread 4a is exposed within the recess 7.

At the outer end of the inner pipe 4, that is, at the end facing the outer surface 1b of the structure 1, the above-mentioned valve 3 is provided to close the outer end opening of the inner pipe 4.
is provided. In the embodiment, the valve 3 is formed into a disk shape having approximately the same diameter as the flange plate 6, and when the inner tube 4 moves toward the inner end thereof, the valve 3 is overlapped with the opening edge of the outer tube 5. is configured to be sealed via a gasket 6a. In addition, the inner tube 4 is provided with a side opening 9 in the tube wall near the valve 3, and opens only when the inner tube 4 moves toward the outer end as shown by the imaginary line in the figure. A grout hole communicating with the inner and outer surfaces of the structure 1 is formed in the structure 1. The side openings 9 are provided at least in two locations facing each other, and if necessary, in about four locations at equal intervals. Incidentally, an internal thread 10 is provided on the inner circumferential surface of the inner end of the inner tube 4 for screwing in a grout injection pipe. In the figure, 11 indicates a hanging fitting.

When filling a grout hole with such a configuration, the inner tube 4 is rotated to project toward the valve 3 as shown by the imaginary line in the figure, and the side opening 9 is opened. Then, in this state, if the injection pipe (not shown) is screwed into the inner pipe 4 and installed, and the grout material is discharged,
The grouting material is applied from inside the inner tube 4 to the outer surface lb through the side opening 9.
Discharge to the side. In this case, since the side opening 9 opens laterally, the grouting material is applied to the outer surface 1b of the structure 1.
is discharged along the Therefore, the ground is not excavated by the grout material discharged from the grout hole. Furthermore, since the movement of the inner pipe 4 is restricted in this state, its position will not change due to grout pressure etc. during filling with grout material, and as a result, the grout hole 2 can be moved without disturbing the ground. The grout material can be filled widely and evenly around the area.

Here, if the location is where there is a strong backflow of muddy water caused by underground water etc. that collects at the back of the structure l, first screw the injection pipe into the inner pipe 4 and attach it, and then rotate the inner pipe 4. By projecting the plug toward the valve 3 side as shown by the imaginary line, it is possible to completely prevent muddy water from flowing back after the plug is removed.

On the other hand, when suspending the structure 1, if the inner tube 4 is positioned as shown by the solid line in the figure, the male thread 4a on the outer circumference of the inner end will be exposed in the recess 7. The hanging fitting 11 can be screwed and attached to this exposed portion. Therefore, there is no need for a dedicated socket for mounting the hanging fitting 2, and workability is improved accordingly.

In addition, in the embodiment, an example was shown in which the inner tube 4 was screwed to the outer tube 5 so that the inner tube 4 could be moved by a required predetermined amount in the axial direction.
It is sufficient that the grout hole can be opened and closed by moving the inner tube in the axial direction, and the inner tube and the outer tube are not limited to the above-mentioned screw connection means.

In addition, 1. In the embodiment, the explanation was mainly given to the grout hole structure of concrete segment l, but the present invention can also be applied to concrete structures having other grout hole structures such as humid pipes, and similar effects can be obtained. However, as a concrete structure, it is not limited only to concrete segments.

"Effects of the Invention" As explained above, in the present invention, a grout hole communicating with the inner and outer surfaces of a concrete structure has a double pipe structure consisting of an inner pipe and an outer pipe, and the inner pipe is connected to the outer pipe. A valve is provided on the outer end side of the surface inner tube to open and close an opening on the outer end side of the outer tube by moving the inner tube in the axial direction. Since the structure has a side opening near the inner pipe that opens only when moving toward the outer end of the inner pipe, it is possible to effectively prevent digging into the ground when pouring grout, and also to prevent the presence of the valve. This makes it easier to prevent the backflow of muddy water, etc., which improves work efficiency.In addition, hanging fittings can be attached directly, making it possible to eliminate the need for sockets, which were previously required. play.

[Brief explanation of the drawing]

The figure is a sectional view of essential parts showing one embodiment of the present invention. l... Concrete structure, la...
Inner surface, 1b... Outer surface, 2... Grout hole, 3... Valve, 4... Inner pipe, 4a.
...Male thread, 5...Outer tube, 5a...
...Female thread, 6...Temporary flange, 6a...
...Packskin, 7...Recess, 9...Side opening, 11...Hanging metal fittings.

Claims (1)

[Claims] The grout hole communicating with the inner and outer surfaces of the concrete structure has a double pipe structure consisting of an inner pipe and an outer pipe, and the inner pipe is configured to be movable in the axial direction with respect to the outer pipe, and the outer end of the inner pipe A side surface is provided with a valve that can open and close the opening on the outer end side of the outer tube when the inner tube moves in the axial direction, and a side surface of the inner tube that opens only when the inner tube moves toward the outer end is provided near the valve. A grout hole in a concrete structure with an opening.