JPH10266790A - Segment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cause a segment to form simple structure as sufficient strength is ensured and to facilitate joining. SOLUTION: A frame body comprises a skin plate 4 arranged on the outer peripheral side; a main beam plate 5 disposed on the side part of the skin plate 4; and a joint plate 6 disposed at the end part of the skin plate 4. Hole parts 11 for joining obliquely communicated with each other are formed in a main beam plate 5 and a joint plate 6. An obliquely communicated insert nut 12 is arranged in one of the hole parts 11 for joining and an obliquely communicated sheath pipe 13 is arranged in the other. The hole part of the sheath pipe 13 forms a bolt insertion hole 13a opened to a recessed part 14 formed on the inner surface side of concrete 3. The bolt 15 for joining is inserted in the bolt insertion hole 13a and joined in a screwed-in state with the inseft nut 12 and by the fastening force thereof, the segments 1 are joined with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a segment that forms a cylindrical wall in the axial direction of a drilled hole by connecting a plurality of pieces to each other.

[0002]

2. Description of the Related Art As a method for constructing a tunnel, a so-called shield method is generally used, in which a cylindrical wall is formed by assembling arc segments on the inner surface side of a digging hole. That is, while excavating the ground with a shield excavator, the arc-shaped segments are joined circumferentially and axially in the excavation hole to construct a cylindrical wall. And as a segment used in this kind of shield method, for example,
Concrete and steel are known.

[0003]

By the way, as a segment used for a tunnel or the like, a segment having a simplified structure while securing sufficient strength and a circumferential direction and an axis for the purpose of cost reduction, shortening of construction period, and the like. There is a need for segments that can be easily joined in any direction.

[0004] The present invention has been made in view of the above circumstances, has a sufficient strength and a simple structure,
Another object is to provide a segment that can be easily joined.

[0005]

In order to achieve the above object, the segments according to claim 1 are connected circumferentially,
A segment that forms a cylindrical wall in the excavation hole by being further connected in the axial direction, wherein the segment is a box-shaped frame having an inner surface opened, and is cast into the frame. Frame, the frame body is provided with a skin plate provided on the outer peripheral side, main girder plates provided on both sides of the skin plate, and joint plates provided on both ends of the skin plate. In the joint portion between the main girder plate and the joint plate, when the main girder plates to be joined or the joint plates are brought into contact with each other, a joint hole communicating with each other is formed. And, on one inner surface of the main girder plate or the joint plate, an insert nut communicating with the joining hole portion is fixed by being inclined toward the outer peripheral side,
On the other inner surface side of the main girder plate or the joint plate, a bolt insertion hole communicating with the joining hole is formed in the same inclined direction as the insert nut, and the bolt insertion hole is formed on the inner surface of the segment. An opening is formed in the concave portion, and a bolt is inserted from the concave portion into the bolt insertion hole and screwed into the insert nut, whereby the segments are fastened and fixed.

A segment according to a second aspect is the segment according to the first aspect, in which the main girder plates or the joint plates have a direction orthogonal to the main girder plates or the joint plates at the joint. To, a joining hole having a diameter that allows the bolt disposed obliquely to be sufficiently inserted is formed,
The inner surface of the main girder plate or the joint plate is provided with the insert nut and the bolt insertion hole via a plate covering the joining hole, and these plates communicate with the insert nut or the bolt insertion hole. Do
A hole having a slightly larger diameter than the bolt is formed.

A third aspect of the present invention is the segment according to the first aspect, wherein the main girder plates or the joint plates have a direction perpendicular to the main girder plates or the joint plates at the joint. The joint hole having an outer diameter through which the bolts arranged diagonally can be sufficiently inserted is formed, and the inner surface of the main girder plate or the joint plate has a diameter that covers the joint hole. And, a cylinder having a through hole through which the bolt can be inserted is fixed, and one of the cylinders has
The insert nut is fixed, and the other side of the cylinder is
The through hole is a bolt insertion hole opened in the recess.

According to a fourth aspect of the present invention, in the segment according to the third aspect, the cylindrical body is obtained by obliquely cutting an intermediate portion of a cylindrical body whose both end surfaces are perpendicular to the axis. It is characterized by being formed.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a preferred embodiment of the present invention. In FIG.
Is a segment constituting a cylindrical wall. These segments 1 are composed of a frame 2 made of a steel plate,
And the concrete 3 cast inside. The frame 2 includes a skin plate 4 provided on the outer peripheral side.
And a main girder plate 5 arranged on the side of the skin plate 4
And a joint plate 6 disposed at an end of the skin plate 4. A plurality of ribs 7 are provided between the main girder plates 5.

[0010] These ribs 7 are arranged on the inner peripheral side of the main girder plate 5, so that a gap S is formed between the ribs 7 and the skin plate 4. The concrete 3 is cast into the frame 2 including the gap S. The inner surface of the frame 2 is coated with an adhesive so that the frame 2 can be reliably integrated with the concrete 3 cast in the frame 2.

Next, a joining structure for joining the above segments 1 will be described. As shown in FIG. 2, the main girder plate 5 and the joint plate 6 constituting the segment 1 include:
A plurality of joining holes 11 communicating with each other are formed. The joining hole 11 is formed obliquely along the insertion direction of a joining bolt 15 described later. And, on one side of the inner surfaces of the main girder plate 5 and the joint plate 6,
Insert nut 1 so as to communicate with joining hole 11
2 are provided obliquely, and these insert nuts 12 are embedded and fixed in the concrete 3.

The other side of the inner surfaces of the main girder plate 5 and the joint plate 6 is connected to the respective joining holes 11 so as to communicate with each other.
Sheath pipes 13 are provided obliquely and are provided. These sheath pipes 13 are buried in the concrete 3, and the ends thereof are opened by concave portions 14 formed in the concrete 3. The hole of the sheath tube 13 is a bolt insertion hole 13a. That is, in a state in which the main girder plates 5 or the joint plates 6 of the segments 1 to be joined to each other are brought into contact with each other, and the joining holes 11 are mutually connected,
Bolt insertion hole 1 of sheath tube 13 opened in recess 14
When the bolt 15 is inserted into the insert nut 3a and the bolt 15 is screwed into the insert nut 12, the segments 1 are fastened and fixed to each other by the bolt 15 to be joined.

As described above, according to the segment 1 of the above embodiment, the skin plate 4 provided on the outer periphery
High strength due to a simple structure in which concrete 3 is cast into frame 2 comprising main girder plates 5 provided on both sides of skin plate 4 and joint plates 5 provided on both ends of skin plate 4. Segmentation.
Also, a concave portion 14 formed on the inner surface of one segment 1
By inserting the bolt 15 through the bolt insertion hole 13a opened in the hole and screwing it into the insert nut 12 of another segment 1, the segments 1 can be extremely easily fastened and fixed by the bolt 15, It is possible to simplify the joining operation between them. That is, the cylindrical wall can be assembled very easily by joining the segments 1 in the circumferential direction and the axial direction, and the construction period of the cylindrical wall can be shortened.

Since the concrete 3 is cast into the steel frame 2 provided with the ribs 7 with a gap S between the skin plate 4 and the concrete 3, the cast concrete 3 is integrated. Thus, the strength of the segment 1 can be significantly improved by the integrated concrete 3.

Next, another example of the joint structure between the segments 1 having the above structure will be described with reference to the drawings. In the joint structure shown in FIG. 3, the insert nut 12, the main girder plate 5, and the joint plate 6
A connection plate 21 is provided between the first and second inner surfaces. A hole 22 having a diameter slightly larger than the outer diameter of the bolt 15 is formed in the connection plate 21, and the hole 22 communicates with the insert nut 12 and the sheath tube 13. Further, in this joint structure, the joint holes 11 formed in the main girder plates 5 or the joint plates 6 to be joined to each other are formed orthogonal to each other, and the diameter of the joint holes 11 is equal to that of the joint bolt 15. The size is such that it can be inserted obliquely. In addition, the connection plate 21
The holes 22 of the connection plate 21 are vertically displaced along the inclination of the bolts 15.

According to the above-described joining structure, the connecting plate 21 having the hole 22 through which the connecting bolt 15 is inserted is interposed on the inner surface of the main girder plate 5 or the joint plate 6. The diameter of the connection holes 11 communicating with each other or the joint plates 6 can be increased within a range covered by the connection plate 21. That is, in the above example, since the sheath tube 13 and the insert nut 12 are directly connected to the inner surface of the main girder plate 5 or the joint plate 6 so as to communicate with the connection hole 11, the joining hole 1
1 is formed obliquely and its diameter is made as small as possible.
Alternatively, a gap is not generated between the joint surface between the inner surface of the joint plate 6 and the sheath tube 13 and the insert nut 12,
Although the poured concrete was prevented from entering, the use of the connection plate 21 allows the connection hole 11 to be enlarged within the range covered by the connection plate 21 as described above. Connection hole 1
1 can be formed perpendicular to the main girder plate 5 or the joint plate 6. Therefore, as compared with the case where the connecting hole 11 is formed obliquely, the processing can be facilitated, and the cost of the segment 1 can be reduced.

The connecting structure shown in FIG. 4 uses thick cylinders 31 and 32, and these thick cylinders 31, 3
2 is fixed to the inner surface of the main girder plate 5 or the joint plate 6, respectively. Then, the insert nut 12 is fixed via the cylinder 31, and the cylinder 32 is connected to the sheath tube 1.
3, and the hole is a bolt insertion hole 32a. These cylindrical bodies 31 and 32 are formed such that the end faces to be joined to the inner surface of the main girder plate 5 or the joint plate 6 are formed obliquely. By doing, these cylindrical bodies 31,
32 is attached so as to be inclined along the insertion direction of the bolt 15. As shown in FIG. 5, a thick cylinder 33 whose both ends are vertical surfaces perpendicular to the axis is simply cut diagonally at a predetermined position to form a cylindrical body having an inclined end surface. 31, 32 can be formed.

According to the above-described joining structure, the thick-walled cylinders 31 and 32 having inclined end surfaces are fixed to the inner surfaces of the main girder plate 5 or the joint plate 6, respectively. The diameter of the connecting hole 11 communicated with the plates 6 can be increased within a range covered by the outer diameter of the cylindrical bodies 31 and 32. Thereby, similarly to the structure using the connection plate 21, the connection hole 11 can be formed perpendicular to the main girder plate 5 or the joint plate 6. Therefore, as compared with the case where the connecting hole 11 is formed obliquely, the processing can be facilitated, and the cost of the segment 1 can be reduced.

The end surface of the cylinder 31 to which the insert nut 12 is attached is a surface orthogonal to the direction in which the bolt 15 is inserted, so that the joining end surface of the insert nut 12 to the cylinder 32 is inclined. Processing can be omitted, and as a result, a commercially available insert nut 12 having a vertical end surface can be used, and the cost can be further reduced.

[0020]

As described above, according to the segment of the present invention, the following effects can be obtained. According to the segment described in claim 1, the frame body includes a skin plate provided on the outer peripheral side, main girder plates provided on both sides of the skin plate, and joint plates provided on both ends of the skin plate. A segment having high strength can be formed by a simple structure in which concrete is cast. Also, by inserting a bolt from a bolt insertion hole opened in a concave portion formed on the inner surface of one segment and screwing it into an insert nut of the other segment,
The segments can be extremely easily fastened and fixed with bolts, and the joining work between the segments can be simplified.

According to the second aspect of the present invention, a joint hole is formed in each of the main girder plates or the joint plates in a direction orthogonal to the main girder plate or the joint plate. A plate with a hole through which the bolt is inserted so as to cover it, that is, a joining hole is formed diagonally in the main girder plate or the joint plate in accordance with the inclination of the joining bolt. Since there is no need to perform this, it is possible to facilitate the processing of the segments, and thereby to reduce the cost of the segments.

According to the third aspect of the present invention, the joining holes are formed in the main girder plates or the joint plates in a direction orthogonal to the main girder plates or the joint plates. , A structure having a cylindrical body having a through hole through which a bolt is inserted, that is, a joining hole is formed obliquely in the main girder plate or the joint plate in accordance with the inclination of the joining bolt. Since there is no need, it is possible to facilitate the processing of the segment, thereby reducing the cost of the segment.

According to the fourth aspect of the present invention, since the cylindrical body obtained by cutting the intermediate portion of the cylindrical body obliquely is attached to the main girder plate or the joint plate, respectively, the segment is manufactured. Cost can be reduced. In addition, since the end of the cylindrical body to which the insert nut is joined is perpendicular to the axis, it is not necessary to perform a process of inclining the end surface of the insert nut. A commercially available product having a vertical end surface can be used, and the cost can be further reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating the configuration and structure of a segment according to an embodiment of the present invention, as viewed from the inner surface side of a cylindrical wall.

FIG. 2 is a cross-sectional view of a joint explaining a joint structure between segments according to the embodiment of the present invention.

FIG. 3 is a cross-sectional view of a joint for explaining another joint structure between segments according to the embodiment of the present invention.

FIG. 4 is a cross-sectional view of a joining portion for explaining another joining structure of segments according to the embodiment of the present invention.

FIG. 5 is a cross-sectional view of a cylindrical body illustrating a cylindrical body used for a joint between segments according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Segment 2 Frame 3 Concrete 4 Skin plate 5 Main girder plate 6 Joint plate 11 Joint hole 12 Insert nut 13a, 32a Bolt insertion hole 14 Depression 15 Bolt 21 Connection plate (plate) 22 Hole 31, 32 Cylindrical body 33 Cylindrical body

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masanori Wakabayashi 1-12-1 Yurakucho, Chiyoda-ku, Tokyo Inside Ishikawajima Building Materials Industry Co., Ltd. No. 1 Inside Taisei Corporation (72) Inventor Yoshinori Nishida 1-25-1, Nishi Shinjuku, Shinjuku-ku, Tokyo Inside Taisei Corporation (72) Inventor Osamu Kaji 1-25-1, Nishi-Shinjuku, Shinjuku-ku, Tokyo Taisei Corporation (72) Inventor Satoshi Teramoto Inside Taisei Corporation

Claims (4)

[Claims] 1. A segment that is connected in the circumferential direction and is further connected in the axial direction to form a cylindrical wall in an excavation hole, wherein the segment is formed in a box shape with an open inner surface. Frame, and concrete poured into the frame, wherein the frame is a skin plate provided on the outer peripheral side, main girder plates provided on both sides of the skin plate, When the main girder plates and the joint plates are brought into contact with each other at the joints between the main girder plates and the joint plates, the joint plates are provided at both ends of the skin plate. To
A joint hole communicating with each other is formed, and an insert nut communicating with the joint hole is fixed to one inner surface of the main girder plate or the joint plate by being inclined toward the outer peripheral side, and the main girder plate or On the other inner surface side of the joint plate, a bolt insertion hole communicating with the joining hole is formed in the same inclined direction as the insert nut, and the bolt insertion hole is opened by a concave portion formed on the inner surface of the segment. The segments are fastened and fixed by inserting a bolt from the recess into the bolt insertion hole and screwing the bolt into the insert nut. 2. The bolts, which are arranged obliquely in a direction orthogonal to the main girder plates or the joint plates, between the main girder plates or the joint plates at the joint portion can be sufficiently inserted. An inner diameter of the main girder plate or the joint plate is provided with the insert nut and the bolt insertion hole via a plate that covers the bonding hole portion. Communicating with the insert nut or the bolt insertion hole,
The segment according to claim 1, wherein a hole having a diameter slightly larger than that of the bolt is formed. 3. The bolts, which are obliquely arranged in the direction perpendicular to the main girder plates or the joint plates, can be sufficiently inserted between the main girder plates or the joint plates at the joint portion. The main girder plate or the joint plate has an outer diameter that covers the bonding hole, and a through hole through which the bolt can be inserted is formed on the inner surface of the main girder plate or the joint plate. A cylindrical body is fixed, and the insert nut is fixed to one of the cylindrical bodies, and the other of the cylindrical body has a through hole formed as a bolt insertion hole opened in the concave portion. The segment of claim 1. 4. The segment according to claim 3, wherein the cylindrical body is formed by obliquely cutting an intermediate portion of the cylindrical body whose both end surfaces are vertical surfaces perpendicular to the axis. .