JPH079149B2 - Underground annular wall segment for excavation and grout backfill injection method using it - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a segment of an annular wall body installed on an underground excavation and a method for injecting grout around the annular wall body.

[0002]

Conventionally, at the time of underground excavation, and the excavation of the simultaneous Urakomi Me injection device of grout in equipped with a shield excavator, the outer surface and excavation anti-installation annular wall in excavation anti-Chikabe I was injecting grout in between. The annular wall body is composed of a plurality of segments connected in the circumferential direction, and each of the segments forming the annular wall body is provided with a grout hole. This grout hole serves as a hole for fixing the transportation device and the segment hanging jig of the erector, and also secondary injection (injection from the inner side of the excavation pit to the outer surface of the annular wall and the ground wall of the excavation pit). Was used as an injection hole to perform.

[0003]

However, in the above-mentioned conventional segment, the grout hole is pre-opened through the segment, and the opening hole is closed.
Since the structure is closed by the plug, there is a problem that water leaks through the gap between the grout hole and the plug screw .

Further , as described above, the grout hole is
Since it penetrates to the outer surface of the
Outer side opening of each grout hole while the milling machine is in progress
Shield excavator tail seal grease (prevention
Water grease will get caught and worn away,
It is uneconomical as the consumption of grease increases.
In addition, it is troublesome to replenish the tail seal grease.
It was. Furthermore, the tail seal is a grout hole
The outer surface of the grout hole while passing through the outer opening of the
The concave part of the side opening end face becomes a weak point of the tail seal action, and
The fact that it becomes an intrusion route into the anti-inner side of the filling material
It was convenient.

Therefore, in view of the above-mentioned circumstances, the present invention is directed to the inside of the mine such as water leakage from the grout hole before the secondary injection .
The challenge is to prevent intrusion and to allow grout to be easily injected from this grout hole during secondary injection, and further reduce the amount of tail seal grease used.
At the same time, the backfill material invades from the tail seal part.
The purpose is not to.

[0006]

Means for Solving the Problems The present invention has been made in consideration of the problems described above, an annular grout between the Chikabe installed in the ground excavation anti is injected Me Urakomi wall of a segment, to provide a segment of the excavation for underground annular wall characterized by having a Gurautoho le over the closed <br/> busy been thickness direction integrally segment outer surface is in the flush, the It solves the problem.

[0007]

In the present invention, the grouthole segment
Since the outer surface side is flush and is closed integrally ,
Leakage <br/> is no Rutotomoni from the grout hole to anti-internal water leakage or grout, the tail at the time of the progress of the shield excavator
Make sure that the recesses in the
Since it is not provided on the surface, unnecessary tail seal grease
The tail seal does not get caught in the recess.
Unnecessary to provide recesses that would be weak points
So improve the tail seal performance. Then, when necessary, the closed grout hole can be opened to inject the grout toward the outer surface side of the annular wall body.

[0008]

EXAMPLES Next, the present invention will be described in detail with reference to the examples shown in FIGS. In the figure, reference numeral 1 denotes a segment of an annular wall body 2. By connecting the segments 1 in a plurality of circumferential directions, an annular wall body 2 is formed. By connecting a plurality of annular wall bodies 2, a tubular body in the ground is formed. Can be configured.

As shown in FIG. 1, the segment 1 has an arc shape corresponding to the diameter of the annular wall body 2. A grout hole 3 is located in the center of the grout hole 3 in the thickness direction. As shown in FIG. 5, in the grout hole 3, the outer surface side of the segment 1 is flush with the constituent material of the segment (that is, concrete), and the cylindrical body 4 is embedded so as to be closed thinly and integrally. It is provided by opening the inner surface side of the segment 1 of the tubular body 4. Also, the opening of the grout hole 3 (the inner surface side of the segment)
Is detachably covered by the plug 5.

On the other hand, a connecting fitting 7 is embedded in each of the four joining end surfaces 6 of the segment 1 so as to expose one surface, and a bolt hole located on the exposed surface of the connecting fitting 7 is a segment suspending member. Hole 8 for fixing and connecting tools
And is not penetrated in the thickness direction of the segment.

While constructing the annular wall body 2 composed of the segment 1 having the above structure for excavation, excavation is performed by injecting (temporarily injecting) grout into the outer periphery thereof. In this temporary injection, the grout hole 3 is blocked, so the grout leaks.
Or water leakage does not occur. When the secondary injection is performed, the plug 5 is removed and the closed portion 3a of the grout hole 3 is inward.
It is opened by breaking it from, and grout is injected into the outer peripheral side of the annular wall body.

An annular wall body consisting of a segment having a thickness of 200 mm and a closed portion of the grout hole having a thickness of 30 mm;
200mm thickness with conventional grouting holes
The leakage was compared by using an annular wall consisting of the segment of. As a result, water leakage was confirmed from the grout holes in the conventional annular wall body, but there was no water leakage in the annular wall body having the unopened grout holes. Moreover, it was confirmed that the opening work of the grout hole could be easily performed by using a reinforcing bar and a hammer, and the grout could be injected in the same manner as the conventional type.

[0013]

As described above, according to the present invention,
Segment of the annular wall body Gurafudo is Note <br/> entering Me Urakomi between Chikabe installed in the ground excavation anti the segment outer surface side
A grout ho that is flush with the surface and is integrally closed
When the need arises , the grout hole of the annular wall body using this segment is opened, and the annular wall body and the underground excavation ground excavation ground are pierced from the grout hole. Since the grout is injected between the wall and the back, water leak before the secondary injection of the grout and the anti-inner side of the primary injected grout
It is possible to surely prevent the leakage to the. And grou
Since it is closed before opening the toe hole,
It is not that Lucille grease is caught, the amount of that can significantly reduce, also from the tail seal part underground
The back-filling material does not infiltrate , and it has excellent practical effects.

[Brief description of drawings]

FIG. 1 is an explanatory view showing one embodiment of a segment according to the present invention from the end face side in a half-faced reinforcing bar state.

FIG. 2 is an explanatory view showing one embodiment of a segment from the side surface side in a half-faced reinforcing bar state.

FIG. 3 is an explanatory view showing an annular wall body composed of segments of one embodiment from the end face side.

FIG. 4 is an explanatory view showing an annular wall body made of segments of one embodiment from the side surface side.

FIG. 5 is an explanatory diagram showing a grout hole in one embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Segment 2 ... Annular wall body 3 ... Grout hole 3a ... Closure part 4 ... Cylindrical body 5 ... Plug 6 ... Joining end surface 7 ... Connecting metal fitting 8 ... Hole for connection

Claims (2)

[Claims] 1. A segment of the annular wall body grout is injected Me Urakomi between Chikabe installed in the ground excavation anti,
Segments excavation for underground annular wall, characterized in that the segment outer surface has a Gurautoho le over the thickness direction which is closed together with the flush. 2. A plurality of segments according to claim 1 are connected to each other to provide an annular wall body extending along the inner circumference of the underground excavation and piercing the closed portion of the grout hole of the segment from the inside.
Open Te, grout Urakomi Me implantation method characterized by injecting Me Urakomi grout between the annular wall and underground excavation anti Chikabe from the grout holes.