JP4040174B2 - segment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
This invention relates to the segment which comprises a cylindrical wall body by being connected with multiple circumferential directions and an axial direction along the inner surface of an excavation hole.
[0002]
[Prior art]
At present, a so-called shield method is generally used as a method for constructing a tunnel, in which a cylindrical wall body is constructed by connecting a plurality of arc-shaped segments on the inner surface side of an excavation hole.
As a segment used for this shield method, for example, concrete, steel, or a combination of steel and concrete is known, and these are connected by fastening each other's joint end faces with bolts, nuts, etc. Is done.
[0003]
[Problems to be solved by the invention]
By the way, when the cylindrical wall body constituted by connecting a plurality of segments by a shield method is used not only for external pressure such as ground pressure but also for a water channel or the like, the inner water pressure causes the segment to particularly move in the circumferential direction. Because a large tensile force is applied in the vicinity of the joint part, the thickness of the segment has been increased to increase the strength. However, increasing the thickness in this way increases the cost of the segment and increases the weight and transportation. There was a problem that the construction work was hindered.
[0004]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a segment that can secure sufficient strength against tensile force and has a simplified structure for cost reduction.
[0005]
[Means for Solving the Problems]
A segment according to the present invention is a circular arc segment that forms a cylindrical wall body by being connected in a circumferential direction and an axial direction along the inner surface of a drilling hole, and has a box shape with an inner peripheral side opened. and formed frame body consists of a Da設been concrete the frame body, the frame body includes a skin plate provided on the outer peripheral side, the axis of the wellbore have been arranged on the periphery of the skin plate a main girder that forms the joining end faces of the adjacent segments in the direction, and also coupling plate forming a joining end face of the segments adjacent to each other in the circumferential direction of the skin plate periphery the wellbore have been arranged in the It consists of vertical ribs for reinforcement arranged between the main girder plates, and the concrete is cast in the frame leaving spaces at both ends in the circumferential direction of the excavation holes, and the main girder is placed in the space the skin play between plates A longitudinal rib for coupling means reinforcement is arranged in a direction substantially orthogonal to, each comprise a reinforcing plate which connects the the該継hand means reinforcing longitudinal ribs the joint plate, the adjacent segment, the joint plates are The joint means reinforcing vertical ribs are connected to each other by linear bolts and nuts, and a taper washer is interposed between the joint means reinforcing vertical ribs and the nut to join in the circumferential direction. The space is a placement space in which concrete is placed after the segments are connected to each other .
As a result, the joint plate is reinforced by the vertical ribs for reinforcing the joint means and the reinforcing plate, and the frame body is integrated by the concrete cast in the placement space after the segments are connected. The vicinity of the portion is increased in strength.
In addition, since the joint means reinforcing vertical ribs are connected to each other by the linear bolt and nut and the taper washer is interposed between the joint means reinforcing vertical rib and the nut, the segments have increased strength in the vicinity of the joint portion. As a result, the strength of the entire segment, particularly in the vicinity of the joint portion in the circumferential direction, is greatly enhanced.
[0006]
Further, in the segment according to claim 2, the joint means reinforcing vertical ribs in the segment according to claim 1 are connected to each other by a linear bolt and nut, and a taper washer is provided between the joint means reinforcing vertical rib and the nut. Instead of the configuration that interposes, the joint means reinforcing vertical ribs are connected by bolts and nuts that are curved along the arc of the frame, so that, as in the invention according to claim 1, the segments are The connection is made in a state where the strength in the vicinity of the joint portion is increased, and the strength of the entire segment, particularly in the vicinity of the joint portion in the circumferential direction, is greatly enhanced.
[0007]
The joint means reinforcing vertical rib according to claim 3 is characterized in that its cross section is substantially L-shaped or substantially T-shaped.
Therefore, the strength of the joint means reinforcing vertical rib itself is ensured, and therefore the strength of the segment, particularly in the vicinity of the joint portion in the circumferential direction, is greatly enhanced. Moreover, reliable integration with the concrete to be placed in the placement space is achieved by the shape.
[0008]
The segment according to claim 4, wherein a tensile material is arranged in the frame along the arc.
The tensile material according to claim 5 is characterized in that it is constituted by both or at least one of reinforcing bars and steel plates assembled in a lattice shape.
Therefore, the tensile material according to the fourth and fifth aspects enhances the strength of the entire segment, particularly the strength against the tensile force in the circumferential direction.
[0009]
The tensile material according to claim 6 is disposed in the placement space of an adjacent segment, with both end portions in the circumferential direction of the excavation hole or one of the end portions protruding from a joining end surface in the circumferential direction. It is characterized by that.
Therefore, when connecting the segments in the circumferential direction of the excavation hole, the tensile material of both of the adjacent segments or one of the segments straddles the joint portion of the segments and reaches the placement space of the adjacent segments, Since the tensile material is continuously arranged at the joints between the segments, the segments to be joined together by the concrete placed in the placement space are integrated with high strength, especially in the circumferential direction. The strength in the vicinity of the portion is further increased.
[0010]
The segment according to claim 7, wherein the main girder plate or the joint plate to be joined to each other is provided with a female thread portion on one side thereof, a bolt hole is formed on the other side, and the bolt hole is inserted into the bolt hole. The main girder plates or the joint plates are fastened and fixed by bolts screwed into the female thread portion.
Therefore, the segments can be connected by a simple operation of bolting from one segment, and a bolt box for performing the connection operation is not required in the portion provided with the female screw portion.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The following is a description of an embodiment of a segment according to the present invention.
In FIG. 1, the code | symbol 1 is a segment which comprises a cylindrical wall body. These segments 1 have an arcuate plate shape, and are synthetic segments composed of a frame body 2 made of a steel plate and a concrete 3 placed in the frame body 2.
As shown in FIGS. 2 and 3, the frame body 2 has a box shape with an inner peripheral side opened, and is disposed on the skin plate 4 provided on the outer peripheral side and the periphery of the skin plate 4. A main girder plate 5 that forms a joint end surface with the segment 1 adjacent in the axial direction of the excavation hole, and a joint end surface that is disposed on the periphery of the skin plate 4 and is adjacent to the segment 1 adjacent in the circumferential direction of the excavation hole. The joint plate 6 is composed of a plurality of reinforcing vertical ribs 7 disposed between the main beam plates 5.
[0012]
As shown in FIG. 4, the main girder plate 5 is provided with a female screw portion 8 in the middle portion thereof and a bolt hole 9 in the vicinity of both end portions, and the female screw portion 8 is formed in the main girder plate 5. It consists of a cap nut 11 welded to the inner surface of the main girder plate 5 in communication with the formed through-hole 10.
Then, the bolt 12 is inserted into the bolt hole 9 provided in the main girder plate 5 of the segment 1 and is fastened to the female thread portion 8 of the segment 1 adjacent in the axial direction of the excavation hole, thereby adjacent to the axial direction of the excavation hole. Matching segments 1 are joined together.
Further, as shown in FIGS. 2 and 3, in the frame body 2, a tension member 15 constituted by a reinforcing bar 13 assembled in a lattice shape and a steel plate 14 arranged along the main beam plate 5. Is provided.
[0013]
In the frame 2, before the segments 1 are connected to each other, the concrete 3 is placed in advance by leaving a space at both ends in the circumferential direction. The concrete 3 is further driven after the segments 1 are connected to each other. The placement space 16 is provided.
In the placement space 16, the vertical ribs 17 for reinforcing joint means having a substantially L-shaped cross section are arranged between the main girders 5, and in the vicinity of both ends of the vertical ribs 17 for reinforcing joint means, A reinforcing plate 18 for connecting and reinforcing the joint means reinforcing vertical rib 17 and the joint plate 6 is disposed.
As shown in FIG. 5, in the vicinity of both ends of the joint means reinforcing vertical ribs 17, bolt holes 19 are respectively provided outside the portion to which the reinforcing plate 18 is attached, and both ends of the joint plate 6. In the vicinity, insertion holes 20 for connecting the segments 1 in the circumferential direction are provided.
As shown in FIG. 6, when the excavation holes of the segments 1 are connected in the circumferential direction, the joint means reinforcing vertical ribs 17 of the adjacent segments 1 are connected to the bolts 21 inserted through the bolt holes 19 and the insertion holes 20. These are fastened and fixed by a connecting member 24 comprising a nut 22 screwed onto the bolt 21.
A taper washer 23 is provided between the nut 22 and the joint means reinforcing vertical rib 17 to eliminate the difference in angle of the contact portion between the joint means reinforcing vertical rib 17 and the nut 22.
After the segments 1 are connected to each other, the concrete 3 is placed in the placement space 16 and the joint means reinforcing vertical ribs 17 are integrated with the frame body 2. 3, the segment 1 is integrated.
[0014]
Next, the construction of the cylindrical wall body by the segment 1 configured as described above will be described.
First, as shown in FIG. 1, the segments 1 are connected to each other in a zigzag manner, and the screw holes 8 and the bolt holes 9 are connected to each other. Are in contact with each other, and in this state, the bolts 12 are inserted through the bolt holes 9 and screwed into the female screw portions 8, and the main girder plates 5 are fastened and fixed together.
[0015]
The connection of the segment 1 in the circumferential direction of the excavation hole is made by bringing the joint plates 6 of the segments 1 to be connected into contact with each other and forming the insertion hole 20 formed in each joint plate 6 and the vertical rib 17 for reinforcing the joint means. A straight bolt 21 constituting the connecting member 24 is inserted into the bolt hole 19, and nuts 22 are fastened to both ends of the bolt 21 with a taper washer 23 interposed therebetween. This is done by fastening 17 together.
[0016]
Thereafter, the concrete 3 is placed in the placement space 16, and the bolts 12 and the joint means reinforcing vertical ribs 17 are integrated with the frame body 2 by the concrete 3.
[0017]
As described above, according to the segment 1 of the above embodiment, the joint means reinforcing vertical rib 17 and the joint plate 6 are reinforced by securing a strength and integrating with the concrete 3 by forming a substantially L shape. The joint means reinforcing longitudinal ribs 17 which are firmly reinforced with each other by the plate 18 and are connected to the frame 2 by the reinforcing plate 18 and the concrete 3 are connected to the circumferential direction of the excavation hole of the segment 1. Since it is performed by connecting, the intensity | strength of the junction part vicinity especially in the circumferential direction is reinforce | strengthened significantly. As a result, the thickness of the segment 1 is increased to increase the thickness in order to maintain the strength of the segment 1 and the cost is not increased. Since the structure is simplified while maintaining sufficient strength, the manufacturing cost can be reduced.
Further, the strength of the entire segment 1, particularly the strength against the tensile force in the circumferential direction, can be increased by the tensile material 15 disposed in the frame 2.
Further, since the excavation hole of the segment 1 is connected to the axial direction of the excavation hole by the main girder plate 5, it can be performed by a simple operation of fastening with the bolt 12 inserted through the bolt hole 9 to the screw portion 8. Work can be done easily and quickly. Further, since the bolt box for performing the connecting work is not required on the side where the female thread portion 8 is provided, the labor required for filling the bolt box with mortar or the like can be reduced.
[0018]
In the above embodiment, the example in which the tensile material 15 is composed of the reinforcing bar 13 and the steel plate 14 is used. However, the present invention is not limited to this, and as shown in FIGS. You may comprise only either. Moreover, in the said embodiment, although the reinforcing bar 13 was distribute | arranged to the inner peripheral side of the steel plate 14, any of these may be distribute | arranged to the inner peripheral side.
Moreover, in the said embodiment, although the shape of the said joint means reinforcement vertical rib 17 was made into the cross-sectional substantially L shape, it is not restricted to this, As shown in FIG. Absent.
Moreover, in the said embodiment, in order to connect more reliably and firmly at the time of the connection to the circumferential direction of the excavation hole of the segments 1, it arises in the contact part of the vertical rib 17 for joint means reinforcement, and the nut 22. FIG. Although the example which eliminated the difference in angle with the taper washer 23 was used, without being limited to this, the attachment angle to the frame body 2 of the vertical rib 17 for joint means reinforcement can be adjusted, as shown in FIG. You may eliminate the difference of this angle using the volt | bolt 21 curved along the circular arc of the frame 2. FIG.
Moreover, in the said embodiment, the connection to the circumferential direction of the excavation hole of the segments 1 is carried out with the bolt hole 19 formed in the mutual joint means reinforcement vertical rib 17, and the insertion hole 20 formed in the joint board 6. Although the example in which the joint means reinforcing vertical rib 17 is fastened and fixed by the connecting member 24 inserted into the joint member 24 is used, the present invention is not limited to this, and the height of the joint plate 6 is lowered as shown in FIG. You may make it pass the volt | bolt 21 on the board 6. FIG.
Further, in the above-described segment 1 in which the height of the joint plate 6 is lowered, as shown in FIG. 12, the end portion of the tensile material 15 is projected from the joining end surface in the circumferential direction of the excavation hole of the segment 1, When connecting the excavation holes in the circumferential direction, they are wrapped in the placement space 16 of the adjacent segment 1 across the joint portion, and these tensions are applied by the concrete 3 placed in the placement space 16 after the connection. The material 15 and the segments 1 may be integrated to increase the strength of the joining portion in the circumferential direction of the segment 1 and the vicinity of the joining portion.
In addition, in FIG. 12, although the mode which protruded the reinforcing bar 13 as the tension | tensile_strength material 15 distribute | arranged to the protrusion state was shown, it is not restricted to this, Only the steel plate 14 or the reinforcing bar 13 and the steel plate 14 are protruded together. You can wrap it.
Further, as the bolts 21 constituting the connecting member 24, screw-reinforcing bars or the like may be used, and screw holes are formed in the joint means reinforcing vertical ribs 17 instead of the bolt holes 19, and bolts are formed in these screw holes. 21 may be screwed together to connect the segments 1 to each other.
Moreover, in the said embodiment, although the example which used the cap nut 11 welded to the inner surface of the main beam board 5 in the state connected to the through-hole 10 as the internal thread part 8 was shown, it is not restricted to this. As shown in FIGS. 13 and 14, members 25 and 26 formed with female threads may be welded to the main girder plate 5 to form a female thread portion 8.
The number and position of the vertical ribs 7 can be arbitrarily selected.
[0019]
【The invention's effect】
According to the segment of the present invention, the following effects can be obtained. According to the segment of claim 1, the joint plate is reinforced by the vertical ribs for reinforcing the joint means and the reinforcing plate, and after the segments are connected, the concrete is placed in the placement space and the frame is integrated. As a result, the strength of the segment, particularly in the vicinity of the joint in the circumferential direction of the excavation hole, can be greatly increased, and the thickness is increased to ensure the strength of the segment. It can be a segment with a simplified structure that can sufficiently withstand internal water pressure without increasing and hindering transportation and construction work.
Moreover, the connection of the segments in the circumferential direction of the excavation holes is performed by connecting the vertical ribs for reinforcing the joint means, which are firmly integrated with the frame body by the reinforcing plate and concrete, with the linear bolts and nuts. Therefore, the segments are connected in a state in which the strength in the vicinity of the joint portion is increased, and the strength of the frame, particularly the strength in the vicinity of the joint portion in the circumferential direction of the excavation hole, is greatly enhanced.
[0020]
According to the segment of claim 2, the connection of the segment in the circumferential direction of the excavation hole is made by joining the reinforcing means and the vertical ribs for reinforcing the joint means firmly integrated with the frame by the concrete into the arc of the frame. Since it is done by connecting with bolts and nuts that curve along , the segments are connected with increased strength in the vicinity of the joint, and the strength of the frame, especially in the vicinity of the joint in the circumferential direction of the drilling hole The strength of is greatly enhanced.
[0021]
The joint means reinforcing vertical ribs according to claim 3 have a substantially L-shaped or substantially T-shaped cross section, whereby the strength of the joint means reinforcing vertical ribs itself is ensured, and depending on the shape of the vertical ribs. Reliable integration with the concrete placed in the installation space is achieved, and the strength of the frame, particularly the strength in the vicinity of the joint portion in the circumferential direction, is greatly enhanced.
[0022]
According to the segment of the said 4th and 5th, the intensity | strength with respect to the tensile force in the circumferential direction can be raised with the tension | tensile_strength material arrange | positioned along the circular arc in the frame body.
[0023]
According to the tensile material of claim 6, when connecting the segments in the circumferential direction of the excavation hole, both of the segments adjacent to the circumferential direction of the excavation hole or the tensile material of one segment are joined portions of the segments. Straddles the adjacent segment placement space, the tension material is continuously arranged at the joint between the segments, and the segments to be joined together by the concrete placed in the placement space are high. Because it is integrated with strength, it is possible to construct a cylindrical wall body that is integrated in the circumferential direction and has a significantly increased strength against internal water pressure and tensile force without providing a complicated structure or increasing the thickness. Possible segments.
[0024]
According to the segment of claim 7, a thread portion provided on one of the main girder plates or joint plates to be joined to each other, a bolt hole formed on the other, and a female thread portion inserted into the bolt hole Since the main girder plates or the joint plates are fastened and fixed by the bolts screwed to each other, the adjacent segments can be connected to each other by a simple operation of bolting from one segment. And can be done quickly.
In addition, since the bolt box for performing the connecting work is not required at the location where the female thread portion is provided in the frame body, the filling work such as mortar into the bolt box can be reduced, and the construction work Since the structure of the segment is simplified, the manufacturing cost can be 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 body.
FIG. 2 is a cross-sectional view of the segment for explaining the configuration and structure of the segment according to the embodiment of the present invention.
FIG. 3 is a vertical sectional view of a segment for explaining the configuration and structure of the segment according to the embodiment of the present invention.
FIG. 4 is a plan sectional view of a connecting portion for explaining an operation for connecting the excavation holes in the axial direction between the segments according to the embodiment of the present invention.
FIG. 5 is a perspective view of the segment for explaining the structure of the segment according to the embodiment of the present invention.
FIG. 6 is a cross-sectional view of a joining portion for explaining the state of connection between the excavation holes in the circumferential direction of the segments and the structure thereof according to the embodiment of the present invention.
FIG. 7 is a longitudinal sectional view for explaining an example of arrangement of tensile members in a segment according to an embodiment of the present invention.
FIG. 8 is a longitudinal sectional view of a segment for explaining an example of the arrangement of tensile members in the segment according to the embodiment of the present invention.
FIG. 9 is a perspective view of the segment for explaining an example of the shape of the joint means reinforcing vertical rib in the segment according to the embodiment of the present invention.
FIG. 10 is a cross-sectional view of a connecting portion for explaining an example of a shape and a connecting state of a bolt constituting a connecting member in a circumferential direction of a segment excavation hole in the segment according to the embodiment of the present invention.
FIG. 11 is a cross-sectional view of a connecting portion for explaining an example of a shape of a joint plate in a segment according to an embodiment of the present invention, a connecting state of a segment in a circumferential direction of a drilling hole, and a structure thereof;
FIG. 12 is a cross-sectional view of a connecting portion for explaining an example of a shape of a tensile member in a segment according to an embodiment of the present invention, a connecting state of a segment in a circumferential direction of a drilling hole, and a structure thereof;
FIG. 13 is a cross-sectional plan view of a connecting portion for explaining an example of the configuration of a female thread portion provided on a main girder plate in a segment according to an embodiment of the present invention.
FIG. 14 is a cross-sectional plan view of a connecting portion for explaining an example of the structure of a female thread portion provided on a main girder plate in a segment 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 7 Vertical rib 8 Female thread part 9 Bolt hole 11 Cap nut 13 Reinforcement 14 Steel plate 15 Tensile material 16 Placing space 17 Vertical rib 18 for joint means reinforcement Plate 19 Bolt hole 20 Insertion hole 21 Bolt 22 Nut 24 Connecting member 25, 26 Member in which internal thread is formed

Claims (7)

A circular arc segment that forms a cylindrical wall body by being connected in the circumferential direction and the axial direction along the inner surface of the excavation hole,
It consists of a frame formed in a box shape with an inner peripheral side opened, and concrete placed in the frame,
The frame includes a main girder plate that forms a joint end surface between a skin plate provided on the outer peripheral side and a segment that is disposed on a peripheral edge of the skin plate and is adjacent to the axial direction of the excavation hole; and the joint plate which has been provided on the periphery to form the joining end faces of the adjacent segments in a circumferential direction of the wellbore, and consists of a longitudinal reinforcing ribs arranged between the adjacent the main girder,
In the frame body, the concrete is cast leaving a space at both ends in the circumferential direction of the excavation hole, and the joint is arranged in the space between the main girders in a direction substantially orthogonal to the skin plate. A means reinforcing vertical rib, and a reinforcing plate for connecting the joint reinforcing vertical rib and the joint plate, respectively.
The adjacent segments are configured such that the joint plates are brought into contact with each other, the joint means reinforcing vertical ribs are connected to each other by a linear bolt and nut, and a taper washer is provided between the joint means reinforcing vertical rib and the nut. Is joined in the circumferential direction by interposing
The space is a placement space in which concrete is placed after the segments are connected to each other . Instead of a configuration in which the joint means reinforcing vertical ribs in the segment according to claim 1 are connected by a linear bolt and nut, and a taper washer is interposed between the joint means reinforcing vertical rib and the nut, The segment according to claim 1, wherein the joint means reinforcing vertical ribs are connected to each other by a bolt and a nut that are curved along the arc of the frame body 2 . The segment according to claim 1 or 2, wherein the joint means reinforcing vertical rib has a substantially L-shaped or T-shaped cross section. The segment according to claim 1, 2, or 3, wherein a tensile material is disposed along the arc in the frame. The segment according to claim 4, wherein the tensile material is constituted by both or at least one of reinforcing bars and steel plates assembled in a lattice shape. The tensile material is disposed in the placement space of an adjacent segment, with both end portions in the circumferential direction of the excavation hole or one of the end portions protruding from a joining end surface in the circumferential direction. The segment according to claim 4 or 5. The main girder plate or the joint plate to be joined to each other is provided with a female screw portion on one side, a bolt hole is formed on the other side, and a bolt inserted into the bolt hole and screwed to the female screw portion. The segment according to any one of claims 1, 2, 3, 4, 5 or 6, wherein the main beam plates or the joint plates are fastened and fixed.

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