JP4166389B2 - Segment fixing device, segment and segment fixing structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fixing device for a segment used when a plurality of segments arranged in an annular shape are joined together by a PC steel material, a segment having the fixing device, and fixing of the segment and another segment by a PC steel material Concerning structure.
[0002]
[Prior art]
When a tunnel is constructed by connecting a plurality of segments in an annular shape by a shield method, as shown in FIG. 5, the PC steel material P is inserted into the sheath tubes 4 and 15 embedded in the segments Sb and Sz, and the tension is fixed. As a result, the bonding strength between the segments Sb and Sz is increased, and the water-stopping property, workability, durability, and the like are improved.
[0003]
In order to implement the fixing structure of this segment, some fixing device is necessary to fix both ends of the PC steel material P inserted into the sheath tubes 4 and 15 and keep the PC steel material P in a tension state. As shown in FIGS. 5 and 6, the pipe member 21 for inserting the PC steel material P into the first sheath tube 4 of the segment Sb and the end portion of the PC steel material P coming out of the last sheath tube 4 of the segment Sb are received. A casting fixing device B in which the pipe member 22 is integrally formed in an X shape is used.
Reference numeral 24 denotes a hydraulic jack that pulls and tensions the PC steel P.
[0004]
[Problems to be solved by the invention]
The above-mentioned conventional segment fixing device B is made of a casting and requires a mold as described above. Therefore, it takes time and effort to manufacture, and it can be manufactured in a variety of types suitable for different segments such as thickness. Hard to do. Therefore, the segment Sb using the fixing device B and the fixing structure of the segment using the segment Sb are problematic.
[0005]
An object of the present invention is to eliminate the above-described conventional problems, and an object thereof is to provide a segment fixing device, a segment, and a segment fixing structure capable of reducing the cost.
Another object of the present invention is to provide a segment fixing device, a segment, and a segment fixing structure that are robust and have excellent durability.
[0006]
[Means for Solving the Problems]
In order to achieve at least one of the above objects, the invention according to claim 1 is directed to a fixing block having two fixing surfaces in a V shape, and at least two sets of through holes in the two fixing surfaces. Opened and arranged side by side in the width direction of the fixing block, a guide frame is fixed to one fixing surface side of the bottom of the fixing block in contact with one through hole, and the other fixing of the bottom of the fixing block is fixed. On the surface side, another guide frame is fixed in contact with the other through hole, and a reinforcing member that receives a torsional force generated between the two sets of through holes is welded between the fixing block and the guide frame. It was.
[0007]
With this means, a simple fixing block having a shape having a through hole and a simple guide frame having the same shape are manufactured, and the fixing device is completed only by fixing the guide frame to the fixing block by welding or the like. In this way, a mold is not required and the manufacturing is relatively easy. Moreover, since the dimensions are flexible when the fixing block and the guide frame are assembled, it can be widely used for various types of segments having different thicknesses. .
Further, in this configuration, when prestress is applied to the PC steel material, the reinforcing member receives a torsional force (rotational force) generated between the two through holes arranged side by side to prevent deformation.
[0008]
In the segment fixing device according to claim 1, it is preferable that the fixing block has a configuration in which two fixing plates arranged in a V shape are integrally coupled by a coupling member (claim 2).
In this configuration, the fixed plate and the coupling member have a relatively small shape, and it is possible to effectively use a piece of steel plate or the like. Further, the concrete filled in the gap between the two fixed plates increases the compressive strength between the fixed plates.
[0009]
3. The segment fixing device according to claim 1, wherein each guide frame is preferably curved in a concave arc shape on the top side of the fixing block.
In this configuration, the guide frame is adapted to the shape of the inner peripheral surface of the segment, and the introduction of the PC steel material into the through hole and the derivation of the PC steel material from the through hole are facilitated.
[0011]
According to a fourth aspect of the present invention, there is provided the segment fixing device according to any one of the first to third aspects, wherein an intermediate portion between one joining surface and the other joining surface of the arcuately curved segment body in the bending direction. In addition, the guide frames are welded and embedded in the rebars of the segment body, with each through-hole substantially aligned with the curve direction of the segment body and the top of the fixing block placed on the inner peripheral surface side of the segment body. A sheath tube is embedded between one through hole of the block and one joint surface of the segment body, with the inner end communicating with the through hole and the outer end opened to one joint surface of the segment body. Between the other through hole of the fixing block and the other joining surface of the segment body, another sheath tube is connected to the through hole at the inner end and the outer end is opened to the other joining surface of the segment body. So it has a structure that was buried. With this means, it is possible to obtain a segment using a fixing device that is easy to handle and inexpensive.
[0012]
According to a fifth aspect of the present invention, the segment according to the fourth aspect is annularly formed by bringing the joint surfaces into contact with each other together with one or more segments in which the sheath tube is embedded in the segment body and communicating the sheath tubes with each other. Each segment is inserted into a sheath tube communicated with each other from the through hole of the fixing block, and one end thereof is fixed to one fixing surface and the other end is fastened to the other fixing surface in a tensioned state. It was set as the structure fixed integrally with PC steel materials. By this means, it is possible to obtain a segment fixing structure with good workability and low cost.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the accompanying drawings.
1 to 4 show an embodiment of the present invention. In these figures, symbols Sa and Sz are segments.
[0014]
The segment Sa is formed by providing a fixing device A and a sheath tube 4 on a segment main body 1 made of concrete in which a reinforcing bar 2 is embedded and curved in an arc shape.
[0015]
The fixing device A includes a fixing block 8 in which two fixing plates 6 having through holes 6a and 6b are arranged in a V shape and are integrally coupled by a plurality (four in the drawing) of coupling members 7. A pair of guide frames 9 is used. The through holes 6a and 6b are opened on the fixing surface 6c of the fixing plate 6. The positions of the two sets of through holes 6a and 6b facing each other are in the width direction of the fixing block 8 (the vertical direction in FIG. 1, FIG. 2). In the direction perpendicular to the paper surface).
[0016]
Each guide frame 9 is divided into two sets of through holes 6 a, 6 b, 6 a, 6 b, and the base end 9 a is in contact with the through holes 6 a at the bottom of the fixing block 8, that is, below the fixing plate 6. It is provided by welding. The guide frame 9 introduces the PC steel material P into the through holes 6a and 6b and guides the PC steel material P taken out from the through holes 6b and 6a to the outside, and its cross-sectional shape is a channel shape opened upward. It is curved in a concave arc shape upward, that is, on the top side of the fixing block 8.
[0017]
A triangular reinforcing member 11 is welded between the fixed plate 6 and the guide frame 9. This reinforcing member 11 prevents torsional deformation of the fixing block 8 due to tension of the PC steel P inserted through the through holes 6a, 6b, 6a, 6b.
[0018]
In the fixing device A having the above-described configuration, the upper portion of the fixing plate 6 that is the top of the fixing block 8 and the free end 9b of the guide frame 9 are segmented at the intermediate position between the curved joint surfaces 1a and 1a of the segment body 1. The guide frame 9 is welded to the reinforcing bar 2 in a state where the inner end 4a of the sheath tube 4 is inserted into the through holes 6a and 6b that are substantially aligned with the inner peripheral surface of the main body 1 and aligned with the bending direction of the segment main body 1. Thus, the segment body 1 is provided integrally with the segment body 1, and the segment body 1 and the sheath tube 4 constitute the segment Sa.
[0019]
The sheath tube 4 has an inner end 4a inserted between the fixing plate 6 of the fixing block 8 and the joint surface 1a of the segment body 1 in the through holes 6a and 6b of the fixing plates 6 and 6, and the outer end. 4 b is opened in the joint surface 1 a and embedded in the segment body 1. The inner end 4a of the sheath tube 4 is usually welded to the fixed plate 6, but may not be welded.
[0020]
As is well known, the segment body 1 is formed by pouring ready-mixed concrete into a mold. For this reason, the fresh concrete inevitably enters the gap C between the fixing plates 6 and 6 of the fixing block 8 as shown in FIG. 2 and solidifies as it is, and the compressive strength of the fixing block 8 is strengthened.
[0021]
Similar to the conventional segment Sb (FIGS. 5 and 6), the segment Sa configured as described above is used for the construction of the tunnel wall T together with the segment Sz, for example, as shown in FIG. The segment Sz is formed by embedding a sheath tube 15 in the segment main body 1 with both ends thereof opened in the joint surface 1a.
[0022]
The tunnel wall T shown in FIG. 4 has an annular shape in which one segment Sa according to the present invention and the existing four segments Sz are brought into contact with each other and the sheath tubes 4 and 15 are in communication with each other. The PC steel material P is inserted into the sheath tubes 4 and 15 from the one through holes 6a and 6b and taken out from the other through holes 6b and 6a to the inner peripheral side of the segment Sa. By applying prestress with a tensioning device 24 (FIG. 5) or the like, both ends of the PC steel P are fixed to the fixing plates 6c and 6c of the fixing block 8 with necessary fixing tools, so that the segments are integrally bonded and fixed. Has been built. For the PC steel material P, a strand of PC steel is usually used. After completion of fixing, generally, the guide frame 9 is filled with mortar and finished.
[0023]
The fixing device A, the segment Sa, and the fixing structure configured as described above have the following effects.
(A) Since the fixing block 8 of the fixing device A has a structure in which the fixing plates 6 and 6 are integrally coupled by the coupling member 7, it can be manufactured at a low cost by using a piece of steel plate or the like.
(B) Since the structural members such as the fixing plate 6 and the coupling member 7 are assembled by coupling means such as welding, the size and shape are flexible. Different types of segments can be handled.
[0024]
(C) Since the gap C is formed between the fixed plates 6 and 6, the compressive strength of the fixing block 8 is reasonably increased by the concrete that has entered the gap C.
(D) Since the guide frame 9 of the fixing device A is formed in a concave arc shape on the top side of the fixing block 8, the insertion work of the PC steel material P into the through holes 6 a and 6 b and the through hole of the PC steel material P The lead-out work from 6b, 6a and the tension work of the PC steel material P can be performed smoothly.
[0025]
(E) In the segment fixing structure, the connection between the segments Sb and Sz is strengthened by the prestress applied to the PC steel P, and the bonding of the bonding surfaces 1a and 1a is difficult to loosen. Even if water pressure acting outward is applied, water leakage is prevented.
(F) Since the reinforcing member 11 is provided between the fixing block 8 and the guide frame 9, torsional deformation of the fixing block 8 when the PC steel material P is prestressed is prevented.
(G) Since the fixing device A can be manufactured at a low cost, the cost of the segment Sa using the fixing device and the fixing structure using the segment Sa is generally reduced.
[0026]
In the illustrated fixing structure, only one PC steel P is used, but two or more PC steels P may be used. In this case, one fixing device in which the fixing block 8 is provided with a set of through holes 6a, 6b and guide frames 9 corresponding to the number of PC steel materials P used, or a segment Sa including a plurality of fixing devices A is used. It is done. Needless to say, the number of sheath tubes 4 and 15 of each segment Sa and Sz is also increased. Although the tunnel wall T in FIG. 4 is constructed by five segments, the number of segments used may be smaller or larger.
[0027]
The fixing block 8 can be manufactured by one member having a substantially triangular shape. At this time, each set of the through holes 6a and 6b becomes one through hole. The shape of the guide frame 9 is not limited to that shown in the figure, and in some cases, the reinforcing bar 2 may be welded to the fixing block 8.
[0028]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a segment fixing device, a segment, and a segment fixing structure that are low in cost and robust and excellent in durability.
[Brief description of the drawings]
FIG. 1 is a plan view of a segment main part showing an embodiment of a segment fixing device and a segment using the same according to the present invention.
FIG. 2 is a cross-sectional view taken along line (II-II) in FIG.
3 is a cross-sectional view taken along line (III-III) in FIG.
FIG. 4 is a diagram showing an embodiment of a segment fixing structure according to the present invention.
FIG. 5 is a diagram showing a conventional fixing structure of a segment.
FIG. 6 is an external view of a conventional segment fixing device.
[Explanation of symbols]
A Fixing device P PC steel material Sa, Sz Segment T Tunnel wall body C Clearance 1 Segment body 1a Joint surface 2 Reinforcing bar 4 Sheath tube 4a Inner end 4b Outer end 6 Fixing plate 6a, 6b Through hole 6c Fixed surface 7 Coupling member 8 Fixing block 9 Guide frame 9a Base end 9b Free end 11 Reinforcing member

Claims (5)

At least two sets of through holes are formed in the fixing block in which two fixing surfaces are provided in a V shape, and are formed side by side in the width direction of the fixing block.
On one fixed surface side of the bottom of the fixing block, a guide frame is fixed in contact with one through hole,
On the other fixed surface side of the bottom of the fixing block, another guide frame is fixed in contact with the other through hole ,
A segment fixing device, wherein a reinforcing member receiving a torsional force generated between two sets of through holes is welded between a fixing block and a guide frame .   2. The segment fixing device according to claim 1, wherein the fixing block has a structure in which two fixing plates arranged in a V shape are integrally connected by a connecting member.   3. The segment fixing device according to claim 1, wherein each guide frame is curved in a concave arc shape on the top side of the fixing block. The segment fixing device according to any one of claims 1 to 3 , wherein each of the through holes is formed in an intermediate portion between one joining surface and the other joining surface in the bending direction of the segment body curved in an arc shape. The guide frames are embedded in the rebars of the segment main body, with the top of the fixing block arranged on the inner peripheral surface side of the segment main body.
Between one through hole of the fixing block and one joint surface of the segment body, a sheath tube is embedded with the inner end communicating with the through hole and the outer end opened to one joint surface of the segment body,
Also, another sheath tube is connected between the other through hole of the fixing block and the other joint surface of the segment body, and the inner end communicates with the through hole and the outer end is opened to the other joint surface of the segment body. A segment characterized by being buried. The segment according to claim 4 is provided in an annular shape by bringing the joint surfaces into contact with each other together with one or more segments in which the sheath tube is embedded in the segment body, and the sheath tubes communicate with each other.
Each of the segments is made of a PC steel material that is inserted into a sheath tube communicated with each other from a through-hole of the fixing block and has one end fixed to one fixing surface and the other end fastened to the other fixing surface in a tension state. A segment fixing structure characterized by being integrally fixed.

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