JPS6149478B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a shield segment that eliminates the need for filling a backfill material between the outer circumferential surface side and the ground when forming tunnels, culverts, underground passages, etc. (simply referred to as tunnels, etc.); The present invention relates to a shield construction method using the segments.

In shield construction methods for tunnels, etc., when segments are assembled and installed in an excavated hole, the outer circumferential surface of the tunnel and the ground are The space between the two is usually filled with a backfilling material such as cement or mortar.

However, filling with this backfilling material is laborious and poses problems in terms of manpower and work progress, and there are also problems in that spaces are left behind after filling, making it impossible to achieve the desired purpose. Ta.

In order to solve this kind of problem, the present invention provides segments in which the outer peripheral surface of the segment body is lined with a water-absorbing slow-expanding material, and a shield construction method that only requires assembling the segments to form a tunnel or the like. The purpose of this invention is to provide a method that eliminates the need to fill the space between the segment and the ground with a backfilling material.

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is the segment body;
Constructed of concrete, reinforced concrete, steel, or a combination of these. The shape of the segment body 1 consists of segment pieces such as tunnels having an appropriate shape such as circular, square, polygonal, etc., and FIG. 1 shows a segment for a circular tunnel.

The outer peripheral surface of the segment body 1 is lined with a water-absorbing slowly expanding material 2. The slowly expanding material 2 may be made of any material as long as it absorbs water and expands slowly. Examples include chromic acid lignin, acrylic salts, urethane, cellulose, and the like. As a commercially available product, there is "Pile Lock" (manufactured by Nihon Kagaku Toyo Co., Ltd.), which is based on synthetic resin and contains inorganic materials, cellulose, etc., and this product can be used after 3 hours of soaking in water. Approximately 20% after 24 hours after it begins to swell.
It has the property of swelling twice as much. The slow-expanding material 2 may be attached to the segment body 1 by mechanical fastening using bolts, nuts, or plates, or if the segment body 1 is made of steel, it may be air-dried after application. Alternatively, it may be by baking.

A sheet 3 is placed on the outer peripheral surface of the slowly expanding material 2 to prevent the expanding material 2 from absorbing moisture in the air and expanding until it is assembled on site. This sheet 3 only needs to be impermeable to water; for example, a vinyl sheet 3 is suitable for use.

Next, a shield construction method for forming a tunnel or the like using the expandable material lining segment will be explained.

First, an expanding material lining segment is prepared in which the outer circumferential surface of the segment body 1 is lined with a water-absorbing slowly expanding material 2 in advance. Next, remove the vinyl sheet 3 at the site and place it in an annular shape inside the excavation hole.
and assemble it in the axial direction. In this assembly, the space between the segment assembly and the ground is not filled with backfilling material such as cement or mortar, as is the case in the past. However, since the water-absorbing slow-expanding material 2 faces the outer peripheral surface of the segment assembly, the slow-expanding material 2 absorbs moisture from the ground 4 and expands slowly, and eventually the segment assembly The space between the ground and the ground 4 is completely filled as shown in FIG. 2, and the formation of the tunnel etc. is completed.

Therefore, when using the expandable material lining segment according to the present invention and the shield construction method using the segment, the following various effects can be obtained.

First, it is possible to eliminate the need for filling a backfill material between the segment assembly and the ground during on-site assembly of the shield segments. Therefore, not only can the human power required for filling the backfilling material be eliminated, but also the work time can be shortened by eliminating the waiting time associated with the removal of the backfilling material filling process and the solidification of the backfilling material. .

In addition, since the intumescent material is stretched over the entire outer periphery of the segment and completely fills the space between it and the ground, there is no unfilled space remaining, and the intumescent material is more moist than the ground. Because it absorbs
It is possible to effectively stabilize the ground, prevent the collapse of the ground, and prevent subsidence of the ground surface.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of one embodiment of the inflatable material lining segment of the present invention, and FIG. 2 is a cross-sectional view of a tunnel or the like formed using the inflatable material lining segment. 1...Segment main body, 2...Slow expansion material, 3
...sheet, for example vinyl sheet, 4...earth.

Claims (1)

[Scope of Claims] 1. An expansion material lining segment characterized in that a water-absorbing slowly expanding material is lined on the outer peripheral surface side of a segment main body that is a constituent member of the shield segment. 2 An expanding material lining segment in which the outer circumferential surface of the segment body is lined with a water-absorbing slow-expanding material in advance, without filling a backfilling material between the segment and the ground on the outer circumferential surface thereof. , a shield construction method using expandable material lining segments that are assembled to form a tunnel or the like.