JPH0437998Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a water-stopping structure for civil engineering segments for waterproofing the joint surfaces of civil engineering segments.

The shield tunnel construction method is used to construct tunnels excavated underground in urban areas, and as shown in Figure 1, the shield tunnel construction method consists of a large number of unitized segments.
A, 1B, 1C, . . . are tightly spliced in both the longitudinal direction a and the circumferential direction b of the tunnel, and are lined on the peripheral wall of the tunnel.

Thus, the joint joint surface between the flanges 2 and 3 at both ends along the circumferential direction b of each segment 1A, 1B, and 1C, and the flanges 4 and 5 at both ends along the length direction a.
It is necessary to keep the joint joint surfaces between the tunnels watertight in order to prevent spring water from leaking into the mine from the mine ground, and for this reason, each joint surface mentioned above is interposed with a water-stop joint material. Here, the conventional joint material 6 will be specifically explained with reference to FIGS. 1 and 2.

Flange 2 of each segment 1A, 1B, 1C...
A strip-shaped mounting groove 4a (FIG. 2) extending completely in the longitudinal direction is recessed in the middle part of the outer wall surface of each of the flange 4 in the width direction.
A band-shaped joint material 6 made of an elastic material such as rubber is fixed, and the surface of the joint material 6 protrudes from the outer surface of each flange 2, 4.

Thus, the flanges 2 and 3 of both segments 1A and 1C are tightened with three connecting bolts 7, and the flanges 4 and 5 of both segments 1A and 1B are
For example, when the fixing nut 8 is tightened as shown in FIG. 2, the joint material 6 is compressed by the tightening margin t, and the joint material 6 is The outer surface is adapted to be pressed against the outer surface of the flange 5 due to repulsive elasticity, thereby making the joint joint surface watertight and waterproof.

By the way, according to such a conventional joint material 6, the thickness of the joint material 6 must be made thick enough to take into account the tightening margin t, and since the joint material 6 largely protrudes from the flange 4 surface, it is difficult to perform construction. When joining the joint, a great deal of effort is required to tighten the nut 8, and there is also the problem that the protruding edge of the joint material 6 gets caught and easily falls off from the mounting groove 4a. Because of this, there were problems such as water leakage due to a decrease in elasticity when the joints expanded due to ground movement after construction, etc.

The present invention was devised to solve the above-mentioned problems, and the purpose of the present invention is to create a segment for civil engineering work that has good workability during construction and provides reliable watertightness. The purpose is to provide a water-stop structure.

As a means to achieve this objective, the present invention provides that a large number of segments 1 forming the inner wall surface of a tunnel or the like are connected to connecting bolts 7 and fixing nuts 8.
In a water-stopping structure for the joint surfaces of segments for civil engineering work, which are connected by joining, one wall surface of the joint surfaces of the segments is a flat surface and the other wall surface is completely penetrated in the longitudinal direction. A mounting groove is formed, and a base portion 11a of the joint material 11 is provided in the mounting area, and a rib-like protrusion 11b extending in the longitudinal direction is integrally formed on one side of a band-like base portion 11a made of a water-expandable material. In the state before expansion, the joint material 11 is
The thickness of the base plate portion 11a is approximately equal to the depth of the mounting groove, the protrusion 11b protrudes from the upper surface of the mounting groove, and its cross-sectional area is formed to be equal to or smaller than the cross-sectional area of the mounting groove. It features a water-stop structure for the civil engineering segment. Hereinafter, the present invention will be explained based on an illustrated embodiment.

FIG. 3 shows that between the joint surfaces of the flange 9 of the segment 1D and the flange 10 of the segment 1E, a wide joint material 11 and a narrow joint material 12 of the equal-shaped example are installed. It shows the cross-sectional shape of joint joints interposed in two rows, and each joint material 1
1 and 12 are mounting grooves 10a of the flange 10, respectively.
10b, details of the joint material 11 (the same applies to the joint material 12) will be described below with reference to FIGS. 4 to 6.

The joint material 11 is made of a water-swellable material, such as a material obtained by mixing and vulcanizing a superabsorbent resin and synthetic rubber, and the synthetic rubber has a crystalline area of 5 to 10% at room temperature. (or a glassy region) is used.

As shown in FIG. 5, the shape of the joint material 11 is as follows:
Two rib-like protrusions 11b each having a substantially semicircular cross section are arranged side by side and formed in a raised manner.

Note that the thickness of the base plate portion 11a of the joint material 11 is approximately the same as the depth of the mounting groove 10a, and therefore, the surface of the base plate portion 11a is approximately flush with the flange 10 surface and the top of the protrusion 11b. The height is formed to a height that sufficiently overhangs the surface of the flange 10, taking into account the tightening margin, and in the state shown in FIGS. 3 and 4 when the fixing nut 8 of the coupling bolt 7 is tightened,
The top of each protrusion 11b is compressed by the tightening margin,
It has similar repulsion elasticity and is in close contact with the 9 sides of the flange. Moreover, the cross-sectional area of the joint material 11 is formed to be equal to or smaller than the cross-sectional area of the attachment groove 10a.

According to the joint material 11 (the same applies to the joint material 12) of the embodiment configured in this way, the thickness of the substrate portion 11a is thin, so there is an advantage that material can be saved. Since it is almost flush, there is no risk of it falling off from the mounting groove 10a during joint joining work, and when tightening the nut 8, it simply compresses with the top of the protrusion 1b.
Since the wall thickness is deformed and stored in the mounting groove 10a, it can be easily fastened.

By the way, with water-stopping materials that use simple water-swellable rubber, if you increase the thickness to improve the initial water-stopping property immediately after construction, the workability will decrease; on the other hand, if you take workability into consideration and reduce the thickness In particular, water-swellable rubber has a lower expansion rate with salt water than with fresh water, so if seawater springs onto the construction site, water may leak as well. I had an easy problem. However, this joint material 1
1, the joint material 11 has sufficient watertightness even in the initial stage due to the close contact of the protrusions 11b, and in addition, in the water-containing state of the joint material after construction, as shown in FIG.
The entire joint material 11 follows and adheres to the flat joint surface of the flange 9 due to the expansion force exerted by the moisture W, so even if the joint expands, there is no reduction in adhesion, ensuring watertightness. can be maintained.

In addition, the joint material of the present invention has its cross-sectional shape set appropriately and rationally in accordance with the construction conditions, taking into consideration the following design elements, such as the 16 different shapes shown in Figure 7. .

(a) Substrate The shape is preferably rectangular, trapezoidal, oblique trapezoid, etc. As for the thickness, increasing the thickness improves watertightness but reduces workability. For example, the roundness of the segment deteriorates. This can lead to a decrease in the strength of the wall thickness due to the underlying causes, and a rope elongation phenomenon in the tunnel length due to the intervention of joint thickness.
On the other hand, if the substrate portion is too thin, the opposite result will occur.

(b) Number of rows of protrusions Two rows is preferred; one row provides excellent compressibility and non-shedding properties, but poor watertightness; three rows contradicts this.

(c) The shape of the protrusion can be any shape such as arc, triangle, rectangle, trapezoid, oblique trapezoid, etc. Equal or symmetrical shapes are not necessarily required, and the height of the protrusion depends on the base part of the joint material. Thickness 5~
3000% (preferably 20-150%), the width of the protrusion is
Although there is no particular limit, it is preferable that the width of the base part of the joint material is 10 to 40%, and the cross-sectional area of the protrusion is 2 to 200% (preferably 5 to 200%) of the cross-sectional area of the base part. If it is too small, the compressibility and non-shedding properties will be poor,
On the other hand, if it is too large, watertightness will decrease.

As described above, according to the present invention, when the joint material 11 is fixed in the segment mounting groove and is transported and fastened, etc., the base portion 11a of the joint material 11 is almost accommodated in the mounting groove, and the mounting groove Since only the protrusions 11b protrude from the upper surface of the joint material 11, there is no accident of the joint material 11 falling off or being damaged, and the workability is improved. Furthermore, at the conclusion and subsequent initial water stoppage stage,
The top of the protrusion 11b is easily compressed and deformed, and the deformed wall thickness moves into the gap between the mounting grooves, so that sufficient adhesion is obtained during fastening, making it possible to form a perfectly circular tunnel with no gaps between segments. At the same time, a sufficient initial water stop effect can be obtained. Further, after installation, due to the expansion action of the joint material 11, the joint surfaces that are in close contact with each other due to the above-mentioned easy tightening are completely and permanently watertight. Further, since the interference portion of the joint material 11 is formed by a protrusion, the use of a relatively expensive water-swellable material can be minimized.

As described above, the present invention is economical and easy to construct, and also enables the formation of a perfectly circular tunnel with no gaps between segments, as well as initial water stoppage and subsequent permanent water stoppage. It has the excellent effect of allowing all of these to be carried out completely.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a tunnel segment and a conventional joint material interposed in a joint of the same segment, FIG. 2 is a cross-sectional view taken along the - line in FIG. 1, and FIG.
The figure is a cross-sectional view of a water-stop structure for a segment for civil engineering work showing an embodiment of the present invention. , FIG. 6 is a perspective view of the joint material shown in FIG. 4, FIG. 6 is an operational view of FIG. 4, and FIG. 7 is a schematic diagram of the cross-sectional shape of the joint material showing other 16 types of embodiments. 1D, 1E... Segment, 9, 10... Flange forming the joint surface, 11, 12... Joint material, 11
a...Substrate portion, 11b...Protrusion.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A joint surface of segments for civil engineering work, in which a large number of segments 1 forming the inner wall surface of a tunnel, etc. are joined by connecting bolts 7 and fixing nuts 8. In the water-stop structure, one wall surface of the joint surface of the segment is a flat surface, and the other wall surface is formed with a mounting groove extending completely in the longitudinal direction, and the mounting groove has a water-swellable material. A joint material 11 in which rib-like protrusions 11b extending in the longitudinal direction are integrally formed on one side of a strip-shaped substrate portion 11a made of a material.
A base plate portion 11a is provided, and the joint material 11 is such that, in its unexpanded state, the thickness of the base plate portion 11a is approximately equal to the depth of the mounting groove, and the protrusion 11b protrudes from the upper surface of the mounting groove. and a water stop structure for a segment for civil engineering work, characterized in that its cross-sectional area is equal to or smaller than the cross-sectional area of a mounting groove. 2 The height of the protrusion of the joint material is 20 times the thickness of the board.
~150%, the width of the protrusion is 10~40% of the width of the board part,
A water-stop structure for a segment for civil engineering work according to claim 1, wherein the cross-sectional area of the protrusion is 5 to 200% of the cross-sectional area of the base plate.