JP3819103B2 - segment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
This invention relates to the segment which comprises a cylindrical wall body in the axial direction of a digging hole by connecting two or more mutually.
[0002]
[Prior art]
As a method for constructing a tunnel, a so-called shield method is generally used in which a circular wall segment is assembled by assembling arc segments on the inner surface side of a drilling hole. That is, while excavating the ground with the shield excavator, the arcuate segments are joined in the circumferential direction and the axial direction in the excavation hole to construct the cylindrical wall body.
As a segment used in this type of shield method, for example, concrete or steel is known.
[0003]
[Problems to be solved by the invention]
By the way, as a segment used for a tunnel or the like, there are a segment with a simplified structure and a segment that can be easily joined in the circumferential direction and the axial direction while ensuring sufficient strength for the purpose of cost reduction, shortening the construction period, etc. Requested.
[0004]
The present invention has been made in view of the above circumstances, and has an object to provide a segment that is sufficiently strong and has a simple structure and that can be easily joined.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the segment according to claim 1 is a segment that is connected in the circumferential direction and further connected in the axial direction to form a cylindrical wall body in the excavation hole, A frame formed in a box shape whose inner surface is opened, and concrete placed in the frame, the frame including a skin plate provided on the outer peripheral side, and both sides of the skin plate A main girder plate provided at both ends of the skin plate, and joint plates provided at both ends of the skin plate. When the two or the joint plates are brought into contact with each other, the main girder plates or the joint plates are disposed obliquely in the direction perpendicular to the main girder plate or the joint plate at the joint. Bolts can be fully inserted Formed joint holes of diameter, on one inner surface of the main girders or joint plate, insert nut in communication with the joining hole portion is fixed is inclined toward the outer peripheral side, the main girder or joint On the other inner surface side of the plate, a bolt insertion hole communicating with the joining hole is formed in the same inclination direction as the insert nut, and the bolt insertion hole is opened by a recess formed on the inner surface of the segment. A plate covering the joining hole formed on the inner surface of the main girder plate or the joint plate, which is in communication with the insert nut or the bolt insertion hole and is formed with a hole having a slightly larger diameter than the bolt; or wherein said bolt can be inserted through holes are formed cylindrical body have an outer diameter that covers the bonding holes are provided, by inserting the bolt from the recess to the bolt insertion hole, wherein the insert By screwing to Tonatto, it is characterized in that each other's segments are fastened.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the segments of the embodiment of the present invention will be described with reference to the drawings.
In FIG. 1, the code | symbol 1 is a segment which comprises a cylindrical wall body. These segments 1 are composed of a frame body 2 made of a steel plate and a concrete 3 placed inside the frame body 2.
The frame 2 includes a skin plate 4 provided on the outer peripheral side, a main girder plate 5 provided on a side portion of the skin plate 4, and a joint plate 6 provided on an end portion of the skin plate 4. A plurality of ribs 7 are provided between the main beam plates 5.
[0010]
These ribs 7 are arranged on the inner peripheral side of the main girder plate 5, and therefore a gap S is formed between the ribs 7 and the skin plate 4. And the concrete 3 is cast in the frame 2 containing this clearance gap S part.
Note that an adhesive material is applied to the inner surface of the frame body 2 so as to be surely integrated with the concrete 3 placed in the frame body 2.
[0011]
Next, a joining structure for joining the segments 1 to each other will be described.
As shown in FIG. 2, the main girder plate 5 and the joint plate 6 constituting the segment 1 are formed with a plurality of joining holes 11 communicating with each other.
In addition, the hole 11 for joining is formed diagonally along the insertion direction of the bolt 15 for joining mentioned later.
An insert nut 12 is disposed obliquely on the inner surfaces of the main girder plate 5 and the joint plate 6 so as to communicate with the joining hole 11 on one side thereof. Is embedded and fixed in the concrete 3.
[0012]
Further, on the other side of the inner surfaces of the main girder plate 5 and the joint plate 6, sheath tubes 13 are provided obliquely so as to communicate with the respective joining hole portions 11. Is embedded in the concrete 3 and the end thereof is opened by a recess 14 formed in the concrete 3. The hole portion of the sheath tube 13 is a bolt insertion hole 13a.
That is, the sheath tube 13 opened in the recess 14 in a state where the main girder plates 5 or the joint plates 6 of the segments 1 to be joined are brought into contact with each other and the joining hole portions 11 are in communication with each other. When the bolt 15 is inserted into the bolt insertion hole 13 a 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.
[0013]
As described above, according to the segment 1 of the above embodiment, the skin plate 4 provided on the outer peripheral side, the main girder plate 5 provided on both sides of the skin plate 4, and the both ends of the skin plate 4 are provided. The segment can be made high in strength by a simple structure in which the concrete 3 is placed in the frame 2 composed of the joint plate 5 formed. Further, by inserting a bolt 15 from a bolt insertion hole 13a opened in a recess 14 formed in the inner surface of one segment 1 and screwing it into the insert nut 12 of the other segment 1, the segment 1 can be very easily obtained. They can be fastened and fixed together with the bolts 15, and the joining operation of the segments 1 can be simplified.
That is, the cylindrical wall body can be assembled by joining the segments 1 in the circumferential direction and the axial direction very easily, and the work period of the cylindrical wall body can be shortened.
[0014]
In addition, since the concrete 3 is cast in the steel frame 2 having the ribs 7 with the gap S between the skin plate 4, the cast concrete 3 can be integrated. The strength of the segment 1 can be greatly improved by the integrated concrete 3.
[0015]
Next, another example of the joining structure of the segments 1 having the above structure will be described with reference to the drawings.
In the joining structure shown in FIG. 3, a connecting plate 21 is provided between the insert nut 12 and the inner surfaces of the main girder plate 5 and the joint plate 6.
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.
Moreover, in this joining structure, the hole 11 for joining formed in the main girder plates 5 mutually joined or the joint boards 6 mutually is formed orthogonally, and the diameter is the bolt 15 for joining. The size can be inserted diagonally.
Further, the connecting plate 21 is provided so as to be shifted up and down, whereby the hole portions 22 of the connecting plate 21 are shifted up and down along the inclination of the bolt 15.
[0016]
And according to said joining structure, since the connection plate 21 which has the hole 22 by which the connection volt | bolt 15 is penetrated was interposed in the inner surface of the main girder plate 5 or the coupling plate 6, the main girder plates 5 or the joint The diameter of the connecting hole 11 communicating with the plates 6 can be increased within the range covered by the connecting 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 connecting hole portion 11, the connecting hole portion 11. The concrete is infiltrated by forming a slanted shape and making the diameter as small as possible so that there is no gap between the inner face of the main girder plate 5 or the joint plate 6 and the sheath tube 13 and the insert nut 12. However, by using the connecting plate 21, as described above, the connecting hole 11 can be enlarged within the range covered by the connecting plate 21, and thereby the connecting hole 11 can be enlarged. Can be formed perpendicular to the main beam plate 5 or the joint plate 6. Therefore, 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.
[0017]
Further, the connection structure shown in FIG. 4 uses thick-walled cylinders 31, 32, and these thick-walled cylinders 31, 32 are fixed to the inner surfaces of the main girder plate 5 or the joint plate 6. ing.
Then, the insert nut 12 is fixed via the cylindrical body 31, and the cylindrical body 32 is used as a substitute for the sheath tube 13, and the hole portion is a bolt insertion hole 32a.
These cylindrical bodies 31 and 32 are formed such that end surfaces joined to the inner surface of the main girder plate 5 or the joint plate 6 are formed obliquely, and the inclined end surfaces are fixed to the inner surfaces of the main girder plate 5 or the joint plate 6, respectively. By doing so, these cylindrical bodies 31 and 32 are attached in a state inclined along the insertion direction of the bolt 15.
As shown in FIG. 5, the cylindrical body whose end face is inclined by simply cutting the thick cylindrical body 33 whose both ends are perpendicular surfaces perpendicular to the axis at a predetermined position. 31, 32 can be formed.
[0018]
And according to said joining structure, since the thick cylinders 31 and 32 with which the end surface was inclined were each fixed to the inner surface of the main girder board 5 or the joint board 6, each main girder board 5 or between the joint boards 6 It is possible to increase the diameter of the connecting hole 11 communicated with the cylinder 11 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 orthogonal to the main beam plate 5 or the joint plate 6. Therefore, 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.
[0019]
Moreover, since the end surface of the cylindrical body 31 to which the insert nut 12 is attached is a surface orthogonal to the insertion direction of the bolt 15, it is not necessary to incline the joint end surface of the insert nut 12 to the cylindrical body 32. As a result, a commercially available insert nut 12 having a vertical end surface can be used as the insert nut 12, and further cost reduction can be achieved.
[0020]
【The invention's effect】
As described above, according to the segment of the present invention, the following effects can be obtained.
According to the segment of claim 1, a frame body comprising 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. It is possible to obtain a high-strength segment by a simple structure in which concrete is cast. Also, the bolts are inserted from the bolt insertion holes opened in the recesses formed on the inner surface of one segment and screwed into the insert nuts of the other segments, so that the segments are fastened and fixed with bolts very easily. It is possible to simplify the joining operation between the segments.
Further, a hole for inserting a bolt is formed in the main girder plates or between the coupling plates so as to form a bonding hole in a direction orthogonal to the main girder plate or the coupling plate. Since the structure is provided with a plate in which a portion is formed, or the structure is provided with a cylindrical body having a through-hole through which a bolt is inserted, the connecting hole is connected to the main girder plate or the joint plate. Since it is not necessary to form it obliquely in accordance with the inclination of the segment, it is possible to facilitate the processing of the segment, thereby reducing the cost of the segment.
[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 body.
FIG. 2 is a cross-sectional view of a joint location for explaining a joint structure between segments according to an embodiment of the present invention.
FIG. 3 is a cross-sectional view of a joint portion for explaining another joint structure between segments according to the embodiment of the present invention.
FIG. 4 is a cross-sectional view of a joint location for explaining another joint structure between segments according to the embodiment of the present invention.
FIG. 5 is a cross-sectional view of a cylindrical body for explaining a cylindrical body used in a joint portion between segments according to an embodiment of the present invention.
[Explanation 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 Recess 15 Bolt 21 Connecting Plate (Plate)
22 holes 31, 32 cylinder 33 cylinder

Claims (1)

A segment that forms a cylindrical wall body in the excavation hole by being connected in the circumferential direction and further connected in the axial direction,
The segment is composed of a frame formed in a box shape whose inner surface side is opened, and concrete placed in the frame,
The frame includes a skin plate provided on the outer peripheral side, a main girder plate provided on both sides of the skin plate, and joint plates provided on both ends of the skin plate,
When the main girder plates and the joint plates are brought into contact with each other, when the main girder plates or the joint plates are brought into contact with each other, In the direction orthogonal to the main girder plate or the joint plate, a bonding hole having a diameter through which a bolt arranged obliquely can be sufficiently inserted is formed,
On one inner surface of the main girder plate or joint plate, an insert nut communicating with the joining hole is inclined and fixed toward the outer peripheral side, and on the other inner surface side of the main girder plate or joint plate, A bolt insertion hole communicating with the joining hole is formed in the same inclination direction as the insert nut, and the bolt insertion hole is opened by a recess formed in the inner surface of the segment,
A plate that covers the joint hole formed on the inner surface of the main girder plate or the joint plate and that is in communication with the insert nut or the bolt insertion hole and has a slightly larger diameter hole than the bolt; or A cylindrical body having an outer diameter covering the joining hole and having a through-hole into which the bolt can be inserted is provided;
A segment in which the segments are fastened and fixed by inserting the bolt from the recess into the bolt insertion hole and screwing the bolt into the insert nut.

Images