JP2521305Y2 - segment - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a segment used for forming a lining of a shield tunnel wall or a shaft retaining wall.

[0002]

2. Description of the Related Art Conventionally, a shield has been installed inside the pile,
The shield method is widely used for tunnel formation, in which the front face of the blade is excavated and moved forward, and the shield tunnel wall, which is the rear space, is rolled up with multiple segments of reinforced concrete. As a segment used here, it is possible today to suppress the expansion of the tunnel circumference and the opening of gaps between each segment due to internal water pressure in flood protection storage tunnels and underground river tunnels. There wasn't. As a countermeasure, secondary lining (reinforced concrete), steel pipes, and FRP pipes were used exclusively. The one having a concave groove along the whole line and the other surface having a convex groove along the whole line are used. According to this, for the external earth pressure and water pressure, by arranging each segment in a row by fitting the concave groove of one segment with the convex groove of the other segment, the lining of the tunnel wall is completed. A vertical shaft retaining wall can be formed.

[0003]

However, in such a conventional segment, the end portion of the concave mortise is liable to be chipped, and there is directionality when winding up. As described above, the mounting direction is restricted, so that there is a problem in that it is not easy to use.

The present invention has been made in view of the above-mentioned conventional problems, and does not impose restrictions on the handling directionality in the lining work, and causes chipping at each end of the hoso. An object of the present invention is to provide a segment that can be made harder and that can enhance the proof stress against internal pressure by interlocking adjacent ones.

[0005]

This invention has been made in view of the above-mentioned object, and its gist is to form a tunnel wall or a shaft earth retaining wall by connecting a plurality of joints to a joint surface. In the segment to be provided, a concave mortise is provided at the center of the pair of joint surfaces in the axial direction of the lining body, and convex mortises are provided at both ends following the central part, respectively. A first reinforcing plate is embedded, a second reinforcing plate is embedded in each of a pair of joint surfaces in the circumferential direction of the lining body, and the first connecting plate connects the first reinforcing plate and the second reinforcing plate. A segment is formed by embedding a member and embedding a second connecting member that connects the second reinforcing plates of the joint surfaces facing each other.

[0006]

In the segment according to the present invention, since the projections are provided at both ends provided on the joint surface, accidents such as chipping of the projections can be suppressed, and the projections can be located at the same position on the two joint surfaces. Since they are provided in a shape, the mounting direction is not restricted when they are laid, and the interlocking improves the proof stress against the internal pressure.

Further, the concave and convex surfaces are reinforced with a reinforcing plate made of a metal material, the reinforcing plate is embedded also in the joint surface in the circumferential direction of the lining body, and these reinforcing plates are connected by a connecting member. As a result, the resistance to the tensile stress acting on the segment is increased, and it can be used with high reliability for underground river walls that receive internal water pressure.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a segment as a precast concrete material having an interlocking end face shape, and here, it is formed in an arc shape for lining a tunnel. Reference numeral 2 denotes a recessed groove as shown in FIG. 2 which is formed in the center of the ring end surface which is a pair of joint surfaces in the axial direction of the lining body of the segment 1. Convex mortars as shown in FIG. 3 are formed on both ends of the mortise 2. Here, the width X of the concave groove 2 is twice the width Y of the convex groove 3, that is, X = 2Y.

Further, the concave groove 2 and the convex groove 3 are provided.
Are provided in a symmetrical manner as shown in FIG. 4 with respect to each pair of joint surfaces in the axial direction of the lining body of the segment 1 as described above, and are dimensioned and shaped so as to fit in close contact with each other. ing. In FIG. 1, 4 is a plurality of through bolt insertion holes provided in the joint surface of the segment 1, 5 is an erector metal fitting, 6 is a concrete injection port, 7 is an insert portion, and 8 is a bolt insertion portion. Further, a joint flat surface portion 9a which is continuously and flush formed is provided on one side of the concave groove 2 and the convex groove 3, and a seal groove 11 is continuously formed on the other side of the continuous flat surface. A seal joint surface 9b is provided. Furthermore, the seal groove 11 is also provided on the pair of joint surfaces in the circumferential direction of the lining body.

As shown in FIG. 4, in the segment 1 having the above-mentioned structure, the respective concave cavities 2 of the two other segments 1 adjacent to the joint surface are fitted into the concave cavities 2 thereof, and
The concave mortises of the above two segments 1 are assembled so as to be fitted into the convex mortises, and this forms the lining wall of the tunnel. Then, the concave groove 2 and the convex groove 3 of each adjacent segment 1 are connected to each other without being separated from each other. Further, the joint flat surface portion 9a which is continuously formed flush with the joint flat surface portion 9a of the other two adjacent segments 1 is a seal joint in which the seal groove 11 is continuously formed on the continuous flat surface. The surface 9b is brought into contact with the seal joint surfaces 9b of the other two adjacent segments 1 respectively, and when the seal groove 11 is filled with the seal material, intrusion of groundwater from the outside of the lining body can be prevented.

Therefore, as described above, in this invention, since the convex groove 3 is provided at both ends of the joint surface of the segment 1, even if the convex groove 3 interferes with another object, the convex groove 3 is not easily chipped. In addition, since the convex groove 3 and the concave groove 2 are provided symmetrically on both joint surfaces, there is no need to use nerves in the direction of the segment lining work, and the construction work efficiency can be improved. Become.

Although the arc-shaped segment has been described in the above embodiment, it can be used in a storage tunnel, an underground river wall, a retaining wall, etc. for flood prevention by forming it into a flat rectangular shape.

By the way, when the segment 1 as described above is used as an underground storage wall or an underground river wall, the inner space of the tunnel is expanded by receiving internal water pressure, and a tensile force is generated in the segment 1. However, although segment 1 is originally made of steel or reinforced concrete and can withstand tensile forces,
Only the tensile resistance of the joint bolt in the joint portion between each segment 1 and the shear resistance of the joint bolt between the rings, and the resistance strength was as small as about 10 to 20% of the main body portion, and it was in a state of almost no resistance. .

According to the present invention, the concave groove 2 and the convex groove 3 are alternately fitted to each other to prevent them from slipping. For example, one segment receives the internal water pressure and the force to separate at the joint portion. This force is transmitted to the side surface of the other adjacent segment as a compressive force to reinforce the concrete bearing portion and resist the tensile force, but in order to further enhance the shear resistance force, each hoso 2 , 3 are reinforced with a metal-based material, and as shown in FIG. As a result, the use as a storage tunnel wall for the above flood countermeasures can be realized with high reliability. In addition, such a concave groove 2
And the segment 1 having the convex groove 3 can be easily formed by using a mold. Cast iron segments can be similarly shaped.

Further, in the reinforced concrete segment, even when a tensile force acts on each segment due to internal water pressure as in a storage tunnel for flood protection, in order to improve the proof strength against this, a plurality of reinforcing plates and A reinforcing structure is provided by the connecting member. That is, the concave groove 2
In order to reinforce the continuous portion of the convex groove 3 and, as shown in FIG. 6, the continuous portion is provided with a keyed steel plate 15 having a shape conforming to the continuous portion, for example, as a first reinforcing plate, and prestressed. PC steel as a second connecting member for introduction 1
End plate 1 as a second reinforcing plate that supports 6 ends with nuts
7 are welded to each other via a connecting steel plate (which may be a large diameter reinforcing bar) 18 as a first connecting member. In these reinforcing structures, the force acting from the fitting portion due to the internal pressure is applied first as a force for pushing the hook-shaped steel plate 15, then transmitted from the connecting steel plate 18 to the end plate 17, and finally the PC steel 16
Acts to pull. Therefore, the tensile stress acting on the segment due to the internal pressure is supported so as to be canceled by the tensile proof stress of the PC steel 16.

Further, the above-described structure for the reinforced concrete segment can be applied to the steel segment. FIG. 7 shows an example of application to this steel segment. In the figure, 1A is a steel segment as a segment, and a wide groove groove 22 is previously formed separately from the seal groove 21 on the ring end surface of the main girder (flat steel) which is a pair of joint surfaces.

A total of four top plate-shaped convex hoppers 3A are attached by welding, one at each end of the mortise groove 22 and one at a distant position in the central portion. . Therefore, a concave groove 2A is formed between these convex grooves 3A, and the fitting surface of the convex groove 3A is formed in a tapered shape as required. Therefore, when the small segment 1A having the convex groove 3A and the concave groove 2A is joined to each other at the ring end surface, the convex groove 3A and the concave groove 2A are joined together.
Is a concave recess 2A of another steel segment 1A adjacent to it.
8 and the convex groove 3A, respectively, as shown in FIG. As a result, each of the mortises 2A and 3A presses against each other at their ends, so that they will resist tensile force after assembly.

[0018]

As described above, according to the present invention, the pair of joint surfaces are provided with the concave recesses at the central portions thereof and the both ends of the joint surfaces are provided with the convex recesses. In addition, since there is no restriction on the installation direction of the segment in the lining work of the tunnel wall, the efficiency of the laying work can be achieved, and the effect of notch chipping at the four corners of the segment is less likely to occur. Also, by providing a reinforcing structure with reinforcing plates and connecting members on the joint surface of each segment in the axial direction of the lining body and the circumferential direction of the lining body, even when receiving internal water pressure like a storage tunnel for flood protection. It becomes possible to withstand the tensile stress acting on each segment,
By interlocking the concave and convex grooves of each segment, it is possible to further improve the yield strength of the segment lining body.

[Brief description of drawings]

FIG. 1 is a perspective view showing a segment according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a segment taken along the line AA in FIG.

3 is a cross-sectional view showing a segment taken along line BB in FIG.

FIG. 4 is a front view showing a tunnel wall surface in which a plurality of segments in FIG. 1 are arranged side by side.

5 is a front view showing a reinforcing structure for a tunnel wall surface in FIG. 4. FIG.

FIG. 6 is a plan sectional view showing a segment according to another embodiment of the present invention.

FIG. 7 is a perspective view showing a steel segment according to an embodiment of the present invention.

8 is a front view before assembly showing the positional relationship of the steel segments in FIG. 7. FIG.

[Explanation of symbols]

 1,1A segment 2,2A concave phos 3,3A convex phos 9a joint plane part 9b seal joint surface 11 seal groove 15 steel plate (first reinforcing plate) 16 PC steel (second connecting member) 17 end plate (second) Reinforcing plate) 18 Steel plate for connection (first connecting member)

Claims (1)

(57) [Scope of utility model registration request] 1. In a segment, a plurality of which are continuously provided on a joint surface to form a tunnel wall, a shaft earth retaining wall, or the like, a concave groove is provided at the center of a pair of joint surfaces in the axial direction of the lining body, and Protruding mortises are provided at both ends following the central portion, a first reinforcing plate is embedded in a continuous portion of the concave cavities and convex mortars, and a second joint is provided on a pair of joint surfaces in the circumferential direction of the lining body. Embedding a reinforcing plate, embedding a first connecting member that connects the first reinforcing plate and the second reinforcing plate, and a second connection that connects the second reinforcing plates on the joint surface facing each other. A segment consisting of embedded members.