JPH0571298U - Concrete fittings for concrete segments for tunnels - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a connecting member for a concrete segment for a tunnel, which can maintain the strength of butt ends and prevent intrusion of groundwater and the like into the tunnel. [Structure] A connecting metal fitting body 9 for attaching to each of the abutting ends 3 of a plurality of tunnel concrete segments 1 adjacent in the circumferential direction of a tunnel 15 is provided. A plurality of anchor bar attachment portions 10 and bolt insertion holes 12 for bolts 11 for connecting the connecting metal fitting bodies 9 of the adjacent concrete segments 1 are provided in the connecting metal fitting body 9 in the thickness direction of the concrete segment 1. It is provided. Anchor muscle attachment part 1
0 is arranged on both lateral sides of each of the bolt insertion holes 12,
The length of the connecting metal fitting body 9 in the thickness direction is set shorter than the thickness of the concrete segment 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is a metal fitting for a concrete segment for a tunnel, which is attached to each butt end of the concrete segment for connecting the plurality of concrete segments for the tunnel in the circumferential direction of the concrete segment. When connected to each other and attached to the inside of the tunnel in a shape that follows the inner wall of the tunnel, the bolts are used to connect the connecting metal fitting bodies so that the concrete segments can maintain the above shape against earth pressure. For the concrete fittings for tunnel concrete segments, which have multiple bolt insertion holes and anchor bars that secure the main body of the fitting to the concrete segment to increase the strength of the joint, Adjacent to each other in the circumferential direction of the tunnel A plurality of connecting metal fittings for attaching to each of the abutting ends of the concrete segments for tunnels are provided, and a plurality of anchor bar attaching portions for anchoring muscles for fixing the connecting metal body to the concrete segment are fixed to the connecting metal body. A connection fitting for a concrete segment for a tunnel, in which a plurality of bolt insertion holes for bolts for connecting the connection fitting bodies of the adjacent concrete segments are provided in the connection fitting body in the thickness direction of the concrete segment. Regarding

[0002]

[Prior Art]

 Conventionally, the above-mentioned metal fittings for a concrete segment for a tunnel have one of the plurality of anchor streak attachment parts located further on the outer peripheral side than the bolt insertion hole which is located on the outer peripheral side of the concrete segment. It was placed. Then, by arranging one of the anchor bar attaching portions in such a manner, the length of the connecting metal fitting body in the thickness direction was substantially the same as the thickness of the concrete segment.

[0003]

[Problems to be solved by the device]

 However, according to the above configuration, since the length in the thickness direction of the connecting metal fitting body is almost the same as the thickness of the concrete segment, one side surface in the thickness direction of the connecting metal fitting body is made of the concrete segment. Since it was exposed to the outer circumference, there was the drawback that groundwater could easily penetrate through the exposed area and penetrate into the tunnel. It is an object of the present invention to solve the above-mentioned conventional drawbacks and provide a metal fitting for a concrete segment for a tunnel, which can prevent intrusion of groundwater or the like into the tunnel.

[0004]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the connection fitting of the concrete segment for tunnel according to the present invention has the anchor bar attachment portions arranged on both lateral sides of each bolt insertion hole, and The length is set to be shorter than the thickness of the concrete segment, and the function and effect are as follows.

[0005]

[Action]

 In other words, since the length of the connecting metal fitting body in the thickness direction is set shorter than the thickness of the concrete segment, it is located on the outer peripheral side of the concrete segment on both sides of the connecting metal fitting body in the thickness direction. Faces can be placed within concrete segments. Then, with the connecting metal fitting body provided in the concrete segment in this manner, the connecting metal fitting bodies of adjacent concrete segments are butted against each other. If a groove for accommodating the waterproof seal is formed between the end surfaces on the side and the waterproof seal is arranged in the groove, even if groundwater enters between the concrete segments, the waterproof seal can Not only can groundwater be prevented from further entering, but groundwater can also be prevented from contacting the main fittings. As a result, it is possible to prevent the formation of a corroded portion due to contact with groundwater at the outer periphery or the abutting end of each adjacent concrete segment. In addition, since the anchor bar attachment parts for the anchor bars that prevent the connecting bracket body from falling off and are fixed to the concrete segment are located on both lateral sides of each of the bolt insertion holes, one of the anchor bar attachment parts is different from the conventional one. The number of anchor bar attachments is larger than that of the concrete segment which is located on the outer peripheral side of the bolt insertion hole which is located on the outer peripheral side of the concrete segment. The anchor support strength can be provided.

[0006]

[Effect of the device]

 Therefore, it is possible to prevent the formation of a corroded portion due to contact with groundwater at the outer periphery or the abutting end of each adjacent concrete segment, and at the same or higher anchor support strength than the conventional one. Therefore, it was possible to provide a concrete fitting for a concrete segment for a tunnel that can reliably prevent intrusion of groundwater into the tunnel while preventing the strength of the joint from decreasing.

[0007]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 4 shows a plurality of tunnel concrete segments 1 arranged on the inner circumferential surface of the tunnel in the circumferential direction and the axial direction of the tunnel. The concrete segment 1 is connected over the entire inner surface of the tunnel with the ends thereof abutting each other to form the inner wall of the tunnel.

As shown in FIG. 3, the concrete segment 1 for a tunnel has a segment body 2 formed in a curved plate shape according to the cross-sectional shape of the tunnel. The first and second butt ends 3 and 4 of the tunnel segment 1 adjacent to each other with respect to the segment main body 2 are respectively provided with a plurality of first and second connecting portions 5 and 6 for connecting the adjacent segment main body 2 to each other. It is provided individually.

As shown in FIG. 1, FIG. 2 and FIG. 3, the first connecting portion 5 is made of cast iron in a U-shape in a plan view in a plurality of openings S formed in the first butting end 3. A first connecting fitting 8 (an example of a connecting fitting for a concrete segment) is embedded and configured.

The first connecting metal fitting 8 is provided with a first connecting metal fitting body 9 (an example of the connecting metal fitting body) for attaching to the butt ends 3 of the concrete segments 1 adjacent to each other in the circumferential direction of the tunnel. The first connecting fitting body 9 is provided with a plurality of female threaded portions 10 (an example of anchor attachment portions) and bolt insertion holes 12 for the anchor bars 7 in the thickness direction of the concrete segment 1. Although three bolt insertion holes 12 are provided in FIG. 2, two bolt insertion holes 12 may be provided. The length of the first connecting fitting body 9 (an example of the connecting fitting body) in the thickness direction of the concrete segment 1 is set to be shorter than the thickness of the concrete segment 1. The anchor bars 7 are for fixing the first joint fitting body 9 to the concrete segment 1 so as not to come off. Further, the bolt insertion hole 12 is for inserting the bolt 11 for connecting the first connecting fitting main bodies 9 of the adjacent concrete segments 1 respectively. The female screw portions 10 are arranged on both lateral sides of the bolt insertion hole 12, respectively, and the anchor bar 7 is formed so as to be inclined in that direction so as to face the inner side of the tunnel in the concrete segment 1. There is. The plurality of female screw portions 10 and the bolt insertion holes 12 are provided in order to increase the strength of the connecting portion. That is, the first connecting portion 5 connects the adjacent concrete segments 1 to each other in a shape along the inner wall of the tunnel. If the concrete segments 1 are not firmly connected to each other, those concrete segments 1 are not Therefore, the above-mentioned shape may not be maintained, so the above-mentioned configuration is adopted.

Further, grooves 20 for accommodating the waterproof seals 21 are formed on the abutting end faces of the first connecting fittings 8 with respect to the adjacent concrete segments 1, at three locations in the thickness direction of the concrete segment 1, respectively. It is formed along the circumferential direction of the concrete segment 1.

As shown in FIGS. 3 and 4, the second connecting portion 6 has a plurality of openings S formed in the second abutting end portion 4 and a second connecting portion made of cast iron having a U-shape in a plan view. The metal fitting 13 is embedded and configured. The second connecting portion 6 has substantially the same structure as the first connecting portion 5, and the details thereof will be omitted, but the number of the female screw portion 10 and the bolt insertion hole 12 provided in the second connecting metal fitting body 14 are not described. Is less than the first connecting portion 5. This is because the second connecting portion 6 connects the concrete segments 1 that are already connected to each other in a shape along the inner wall of the tunnel in the axial direction of the tunnel, which means that the strength for maintaining the shape is improved. This is because it does not have to be taken into consideration as in the case of the first connecting portion 5.

To connect the concrete segments for tunnel 1 to each other, the bolts 11 are inserted through the bolt insertion holes 12 in both the first connection metal fitting bodies 9 that are butted against each other, and the nuts are screwed to the protruding tips of the bolts 11. By concluding and concluding. Further, before connecting in this manner, the groove 20 is filled with a waterproof seal 21 in advance.

As shown in FIGS. 5, 6 and 7, the key segment first connecting fitting 8 A embedded in the key segment 1 A is different from the first connecting fitting 8 in the position of the female screw portion 10. There is. That is, with respect to the bolt insertion hole 12 located on the outer peripheral side of the concrete segment 1, both female screw portions 10 arranged on both lateral sides of the concrete segment 1 are displaced in the thickness direction of the concrete segment 1. There is. As a result, as shown in the figure, even when the key segment 1A is connected to the adjacent concrete segment, it is possible to avoid the interference between the anchor muscles 7 in the thin wall portion. In addition, with respect to the bolt insertion hole 12 located on the inner peripheral side of the concrete segment 1, the female screw portions 10 arranged on both lateral sides thereof are not displaced. This is because the anchor bar 7 attached to this part is shorter than the anchor bar 7 attached to other parts, so the adhesion length cannot be taken, so both ends are processed with right and left screws, and both metal parts are connected. There is.

The abutting end surface of the first key segment connecting fitting 8A for the adjacent concrete segment 1 is formed as an inclined surface along the peripheral surface of the key segment 1A.

It should be noted that reference numerals are added to the claims of the utility model for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a connecting fitting in a connected state.

FIG. 2 is a perspective view of a connecting fitting.

[Fig. 3] Perspective view of a concrete segment

FIG. 4 is a diagram showing a connection state of concrete segments.

FIG. 5 is a cross-sectional view of the connecting fitting attached to the key segment.

FIG. 6 is a front view of a key segment connecting fitting.

FIG. 7 is a diagram showing an assembled state of key segments.

[Explanation of symbols]

 1 Tunnel 3 Butt end 7 Anchor bar 9 Connecting metal fitting body 10 Anchor bar attachment part 11 Bolt 12 Bolt insertion hole 15 Tunnel

Claims (1)

[Scope of utility model registration request] 1. A connecting metal fitting body (9) for attaching to each of the abutting ends (3) of a plurality of tunnel concrete segments (1) adjacent to each other in the circumferential direction of the tunnel.
And a plurality of anchor bar attachment portions (10) for anchor bars (7) that prevent the connecting metal fitting body (9) from falling off and are fixed to the concrete segment (1) are provided in the connecting metal fitting body (9) and are adjacent to each other. Bolt insertion holes (1) for bolts (11) for connecting the connecting metal fitting bodies (9) of the concrete segments (1) to each other.
2) is a connecting fitting for a concrete segment for a tunnel, wherein a plurality of connecting fittings are provided in the connecting fitting body (9) in the thickness direction of the concrete segment (1), both lateral sides of each of the bolt insertion holes (12). The anchor metal attachment part (10) is arranged in the connection part, and the length in the thickness direction of the connection fitting body (9) is set shorter than the thickness of the concrete segment (1). .