JP3927109B2 - segment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a segment having a joint for joining segments to each other with a single touch, and more particularly to a segment (segment piece) used when a tunnel is constructed by a shield method.
[0002]
[Prior art]
In the shield method, the outer shell (shield) is excavated while preventing the earth and sand in front of the tunnel, and at the same time, the outer shell is pushed forward, and in parallel with this, the segments are assembled into a ring shape at the rear of the outer shell, and the ring segments are assembled. A tunnel inner wall (lining) is formed by successively building in the tunnel axis direction. To push out the outer shell, there is a large force of several hundred tons to several thousand tons, but the segment receives the reaction force and feeds the outer shell forward with a jack.
[0003]
FIG. 14 is a partially broken perspective view of a shield tunnel under construction. 1 is a shield machine, 1a is a cylindrical steel outer shell, 1b is a cutter head of an excavator, 2 is a segment ring, 2a is a segment, 3 Is a shield jack. The shield machine 1 is arranged at the head position of the tunnel under construction, and the shield machine has an outer casing 1a formed in a cylindrical shape. A cutter head 1b for excavating the ground is provided at the front part of the outer casing 1a, and a plurality of shield jacks 3 are mounted on the inner periphery of the rear part of the outer casing 1a. Each jack is selectively mounted on the front end of the segment in such a way that a reaction force can be determined. An erector (not shown) for assembling the segment is provided in the rear space 4 in the outer casing 1a so as to receive the segment 2a from the conveying device (not shown), hold it, and rotate and position it. A tunnel made of a segment ring 2 is constructed and formed in a cylindrical shape behind the shield outer casing 1a. In the shield tunnel, segments 2a each formed in an arc shape are connected in the circumferential direction to form a segment ring 2, and the segment ring 2 is already built in the tunnel axial direction as the shield machine 1 advances. Constructed by adding to the segment ring.
[0004]
That is, an arc-shaped segment (segment piece) 2a having a predetermined width is assembled in a ring shape to form one segment ring 2, and every time the shield excavation advances by one ring, the tunnel of the segment ring already built Segments are built in the form of adding new segment rings in the direction of travel. Therefore, the outer shell 1a of the shield machine moves forward in a form that seeks a reaction force at the front end of the latest segment ring, and as the shield machine 1 moves forward, a tunnel composed of segment rings is built behind it.
[0005]
The segment 2a includes a concrete segment, a steel segment, a steel-concrete composite segment, etc., depending on the material. In the case of using a concrete segment as a segment, in order to fasten adjacent segments, conventionally, a box-shaped depression called a bolt box and a bolt hole for joining are provided in the segment, and bolt fastening is performed using these. Segment joints to be performed were common (Japanese Patent Laid-Open No. 10-153095).
However, there is a problem that the bolt fastening is troublesome, so recently, in order to mechanize the segment assembly, a new segment is pressed against the already built segment and the jack 3 of the shield machine 1 is used. In addition, there is known a joining method using a one-touch type inter-segment joint that can be fastened by a propulsion reaction force (see Japanese Patent No. 3213814).
[0006]
15 and 16 are enlarged cross-sectional views of a conventional one-touch type segment joint portion. FIG. 15 shows a state before joining, and FIG. 16 shows a state after joining. 2a1 and 2a2 are segments constituting adjacent segment rings. In this conventional one-touch joint metal fitting, a male metal piece 5 is protruded and fixed to one segment 2a1 side of a segment to be joined, a female metal piece 6 is formed on the other segment 2a2 side, and a recess 7 is formed so as to form a recess 7. It is attached in the form of embedding in the concrete 8, and the male and female hardware 5 and 6 are fastened by the pushing force by the machine. That is, male metal 5 and female metal 6 are embedded in the surfaces to be joined to each other adjacent segments 2a1 and 2a2 in the tunnel axis direction, and the inner diameter of female metal 6 is slightly smaller than the outer diameter of male metal 5. The male metal 5 is pushed into the female metal 6 by using the force of the jack 3 of the shield machine 1, and the newly built segment 2a1 is joined to the already built segment 2a2.
[0007]
When the male metal member 5 and the female metal member 6 of the inter-ring joint are engaged, a slight shift occurs in the position and the direction of the shaft center, but the polyethylene foam 9 absorbs the shift. For this reason, both are correctly fastened without destroying the concrete of the segment. Moreover, since the powder coating is given to the outer surface of the male metal object 5, it fits smoothly with respect to the joint surface of the female metal object 6, and both closely_contact | adhere closely. And even if the friction by the crimping | compression-bonding fastening of a male and female hardware arises, the corrosion resistance of a metal surface is ensured. In addition, 10 is a concrete, 10 is a gasket for water stop provided in a strip shape on the contact surface.
[Patent Document 1]
JP 10-153095 [Patent Document 2]
Patent No. 3213814 [0008]
[Problems to be solved by the invention]
FIG. 17 is an enlarged perspective view of a conventional segment. In the conventional segment 2a, the male metal object 5 protrudes from the joining end face, and the segment is transported and stored in this protruding state. However, if the male metal object 5 is transported and stored in a protruding state, there is a risk of damage to the male metal object 5 or the segment concrete in which the male metal object 5 is embedded due to a collision, catching, etc. There was a problem that required as much space as possible.
From the above, the object of the present invention is to avoid the risk of damage to hardware and segments without impairing the merit of this type of segment that can be joined with one touch using the mechanical force of the shield machine, And it is to be able to save space.
[0009]
[Means for Solving the Problems]
The present invention is a segment that joins segments by pushing a male metal object that protrudes and is fixed to an end surface to be joined of a segment into an open hollow portion of a female metal object embedded in an end surface to be joined to another segment. A male metal object can be attached to the segment body, an insert member provided with a coupling means for coupling the male metal object is embedded in the segment main body, and a coupling part for coupling the coupling means to the male metal object is provided. The connecting means and the connecting portion are constituted by screws, and an engaging portion of a screw fastening tool is provided on the male metal object to constitute a segment. According to this segment, it is possible to eliminate the possibility that the male metal object does not protrude from the segment joining end surface during conveyance or storage, and the male metal object is damaged during conveyance or storage, or the concrete segment is damaged. This eliminates the need for space for transportation or storage. Moreover, a male metal object can be easily attached to the insert member on site by using a screw, and workability can be improved.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
(A) First Embodiment FIG. 1 is an explanatory view of a joining method of segments of the present invention having a one-touch type joint structure, and FIG. 2 is a sectional view of the segments of the first embodiment of the present invention.
As shown in FIG. 1, joint portions are formed on four side surfaces (joint surfaces) 311 to 314 in the tunnel axis direction and the tunnel circumferential direction of the segments 2a1 and 2a2. Among these, a known quick joint is provided at the joint portion of the segment adjacent in the circumferential direction, but the illustration and description are omitted because it is not related to the present invention. One-touch type joints are used for the joint portions of the segments 2a1 and 2a2 adjacent in the tunnel axis direction. That is, a plurality of (three sets in the figure) one-touch joint portions are provided on the joint surfaces 311 and 312 of the segments 2a1 and 2a2, and the male portions 321 to 323 in the joint portion of one segment 2a1 are connected to the other segment 2a2. Both of them are joined by being crimped and fastened to the female parts 331 to 333 in the joint part.
[0012]
Each of the segments (segment pieces) 2a1 and 2a2 has a concrete segment main body 35 formed in an arc shape curved in a direction intersecting with the paper surface in FIG. 2, and one joint surface 312 of the segment main body 35 in the tunnel axis direction. Male portions 321 to 323 are formed on the other joint surface 311, and female portions 331 to 333 are formed on the other joint surface 311. That is, in the illustrated example, three male portions 321 to 323 and three female portions 331 to 333 are provided on both end surfaces in the tunnel axis direction of one segment.
As shown in FIG. 2, the male parts 321 to 323 are composed of an insert 32a embedded in the concrete constituting the main body part 35 of the segment and a male metal piece 32b which can be attached to the insert. The insert 32a includes an insert main body portion 32a-1 and a wedge-shaped anchor portion 32a-2. The main body portion 32a-1 is formed with a female screw 32a-3 for connecting a male metal object 32b. A male screw formed on the male hardware 32b is screwed together.
[0013]
The male metal piece 32b has a shape as shown in the enlarged perspective view of FIG. 3 and the enlarged sectional view of FIG. That is, powder coating is applied to the outer surface on the distal end side of the cap portion 32b-1, a chamfered portion 32b-2 is formed at a predetermined position on the base portion side of the cap portion, and a further proximal end side of the chamfered portion is a support portion. 32b-3 is provided. The support portion 32b-3 is provided with a male screw 32b-4 that is screwed with the screw 32a-3 of the insert 32a. The cap 32b-1 is filled with a filler 32b-5 from the upper hole.
To connect the male metal piece 32b to the insert 32a, as shown in the AA arrow view of FIG. 5, the male metal chamfered portion 32b-2 is held and rotated by a screw tightening tool 41 such as a hexagon wrench or pipe wrench. Thus, the male hardware 32b can be easily connected to the insert 32a.
That is, the insert 32a is embedded in a predetermined depth position of the hole, and the support 32b-3 is embedded in the insert hole, and the male metal object 32b is connected to the insert 32a with a screw to be fixed to the segment body 35. . As for the screw, either the insert 32a or the male metal piece 32b may be a male screw and any of them may be a female screw.
[0014]
Moreover, female fittings 33 constituting the female portion 331 to 333 is as shown in FIG. 2, the anchor side from the joint surface 31 ₁ of the segment in the concrete forming the main body portion 35 of the segment in the form obtained by projecting a predetermined length fraction It is provided in an embedded form.
The female hardware 33 is a hollow body in which a main body portion 33a formed of a metal pipe member and a wedge-shaped anchor portion 33b in which a screw portion is formed on a shaft core portion are integrated by friction welding and one side is opened. The portion 33c is included. On the outer periphery of the main body 33a, the polyethylene foam 33d absorbs the shift when a slight shift occurs in the position and the direction of the axis when engaging with the male metal of the segment adjacent in the tunnel axis direction. Further, the female metal object 33 into which the male metal object 32b is pushed is provided with a predetermined thickness so as to exhibit a buffering function when deformed so as to swell slightly in the radial direction.
[0015]
The screw 33e of the anchor support portion 33b is used as a jig mounting screw and reaches the hollow portion 33c. When manufacturing the segment, the female hardware is positioned and fixed to the segment manufacturing form by screwing the bolt of the jig into the screw 33e from the opening side of the female hardware as will be described later.
[0016]
In order to manufacture the segment having the above joint structure, as shown in FIG. 6, a predetermined number of male inserts 32a are provided on one end face in the tunnel axial direction of the mold 41, and the same number of female hardware 33 is provided on the other end. And female hardware are set in the same position and axial direction. At this time, as shown in FIG. 7, the positioning bolt 51 of the positioning / fixing jig 50 is screwed into the female screw 32a-1 of the insert 32a via the presser plate 52 and set in the mold 41. Further, the positioning bolt 61 of the positioning / fixing jig 60 is screwed into the screw 33e of the female hardware 33 through the presser plate 62 and set to the mold 41. As described above, the insert 32a and the female hardware 33 can be accurately and easily positioned and set on the mold 41.
[0017]
If concrete is placed in the concrete placement space 42 of the mold 41 as shown by the arrows in FIG. 6 with all the inserts 32a and all the female hardware 33 attached to the mold 41, the required number is obtained as shown in FIG. The segment body 35 in which the insert 32a and the female hardware 33 are embedded is completed.
In the segment of the present invention manufactured as described above, the insert 32a and the female metal piece 33 are fixed to the concrete with the frictional force of the anchor portions 32a-2 and 33b. For this reason, it is possible to perform segment joining with a one-touch joint without causing local stress in the concrete constituting the segment at the time of segment joining after connecting the male metal piece 32b to the insert 32a or after segment joining. . That is, with the polyethylene foam 33d provided around the pipe-shaped main body of the female metal piece 33, the anchor portions 32a-2 and 33b can absorb the deviation of the axial center from the male metal piece 32 and be deep from the segment end surface. Since it is firmly fixed, the segments can be appropriately joined together simply by mechanically pushing them with a shield jack.
[0018]
When the segment formed as described above is built in the shield tunnel, the male metal piece 32b is connected to the insert 32a of the newly built segment 2a1 with a screw as shown in FIG. Thereafter, the male part 32b of the new segment 2a1 is pushed into the female part (female metal part) 33 of the built-in segment 2a2 by using the pushing force of the shield jack. At this time, since the inner diameter of the female metal piece 33 is formed to be slightly smaller than the outer shape of the male metal piece 32b, the adjacent segments can be surely and firmly joined and integrated by inserting the male metal piece 32b.
[0019]
According to the segment of the first embodiment, the segment main body and the male metal can be separated, and the male metal is attached to the segment main body at the time of joining, so that the male metal does not protrude from the segment joining end surface during transportation or storage, There is no longer any risk that the male metal will be damaged during transport or storage, or that the concrete segment will be damaged. In addition, since there are no protrusions, the space required for transportation or storage can be saved. In addition, according to the segment of the first embodiment, the male metal object can be easily mounted on site by the male metal connecting means (for example, a screw) provided in the insert member, and the segment joining work is performed by the shield machine. Since it can be performed with one touch using the mechanical power of, it is possible to improve workability.
[0020]
-Modification As a modification of the first embodiment, as shown in FIG. 9, an insert 32a whose end face is arranged on a joining end face of a segment may be used. As yet another modification, as shown in FIG. 10, the anchor portions 32a-2 and 33b may be formed of deformed reinforcing bars instead of wedges, and threaded portions may be formed at the ends thereof. As another modification, as shown in FIGS. 11 and 12, the anchor portions 32a-2 and 33b may have an appropriate shape that is easy to process, and as shown in FIG. The distal end side may be formed so as to enter the base 32b-5 of the male hardware 32b.
In the illustrated example, only the male hardware is attached to the segment using the insert. However, the insert may be used to attach both male and female hardware.
[0021]
(B) Second Embodiment FIG. 13 is an explanatory diagram of a second embodiment of the present invention.
In the second embodiment, the segments 2a ₁ and 2a ₂ are formed by embedding the same female metal piece 33 in both end faces 31 ₁ and 31 ₂ to be joined (in the tunnel axis direction). The female metal piece 33 of the second embodiment may have the same configuration as the female metal piece of the first embodiment, but in the second embodiment, the anchor portion 33b is replaced by a bolt support portion 33b-1 and an anchor bolt 33b-2. It is composed. The segment of the second embodiment can be manufactured by the same method as that of the first embodiment.
[0022]
For joining the segments 2a ₁ and 2a ₂ , a male and female hardware 80 that is a rod-shaped metal lump is prepared, and this male and female hardware 80 is inserted into the female hardware 33 and 33 to be joined of the segments 2a ₁ and 2a _2. Done. The male and female hardware 80 is shaped so that both ends of the male hardware 32b of the first embodiment are provided at both ends, and an annular water-stopping material (gasket or water expansion rubber) 81 is provided near the center in the length direction. It has been.
When joining the segments 2a ₁ and 2a ₂ , one end of the male and female hardware 80 is pushed into the open hollow portion 33c of the female hardware 33 of _one segment 2a ₁ to form a male part, and the male and female hardware 80 should be joined The other segment 2a ₂ is pushed into the open hollow portion 33c of the female metal piece 33 to join the segments together. In the male and female hardware 80 of the second embodiment, an annular water-stopping material 81 made of a gasket or water-expanded rubber or the like is wound around the center in the longitudinal direction. It is possible to prevent water from entering the hollow portion of the metal object.
[0023]
According to the segment of the second embodiment, the segment main body and the male and female hardware can be separated, and the male and female hardware is attached to the segment main body at the time of joining, so that the hardware does not protrude from the segment joining end face during transportation or storage. There is no longer a risk that the hardware will be damaged during transportation or storage, or the concrete segment will be damaged. In addition, since there are no protrusions, the space required for transportation or storage can be saved. In addition, according to the segment of the second embodiment, male and female hardware can be easily installed on site, and the segment joining work can be performed with one touch using the mechanical force of the shield machine. Workability can be improved.
[0024]
【The invention's effect】
As described above, according to the present invention, a male metal object can be attached to the segment main body, an insert member provided with a connecting means for connecting the male metal object is embedded in the segment main body, and the male metal object is connected to the connecting means. Since the segment is formed by providing the connecting portion, the male metal object does not protrude from the segment joining end face during transportation or storage, and the male metal object is not damaged during the transportation or storage, or the concrete segment is not damaged. In addition, since there are no protrusions, the space required for transportation or storage can be saved.
Further, according to the present invention, the male hardware can be easily attached on site by the male hardware connecting means (for example, a screw) provided on the insert member, and the segment joining operation can reduce the mechanical force of the shield machine. Since it can be used with one touch, workability can be improved.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a method for joining segments of the present invention having a one-touch joint structure.
FIG. 2 is a sectional view of a segment of the first embodiment of the present invention.
FIG. 3 is an enlarged perspective view of a male metal object.
FIG. 4 is an enlarged cross-sectional view of a male metal object.
FIG. 5 is an AA arrow view.
FIG. 6 is a first explanatory view of a method for manufacturing a segment.
FIG. 7 is a second explanatory view of the segment manufacturing method.
FIG. 8 is a perspective view of a segment body.
FIG. 9 is a first modification of the first embodiment.
FIG. 10 is a second modification of the first embodiment.
FIG. 11 is a third modification of the first embodiment.
FIG. 12 is a fourth modification of the first embodiment.
FIG. 13 is an explanatory diagram of a second embodiment of the present invention.
FIG. 14 is a partially broken perspective view of a shield tunnel under construction.
FIG. 15 is an enlarged cross-sectional view (before joining) of a conventional one-touch type segment joint portion.
FIG. 16 is an enlarged cross-sectional view (after joining) of a conventional one-touch type segment joint portion.
FIG. 17 is an enlarged perspective view of a conventional segment.
[Explanation of symbols]
2a1, 2a2 Segment 35 Segment body 32a Insert
32a-2 Anchor part 32b Male hardware
32b-1 Cap
32b-2 Chamfer 33 Female hardware
33b Anchor part

Claims (1)

In the segment that joins the segments by pushing the male metal that protrudes and is fixed to the end surface to be joined of the segment into the opening hollow part of the female metal object embedded in the end surface to be joined of the other segment,
A male hardware can be attached to the segment body,
In the segment body, an insert member provided with a connecting means for connecting the male metal object is embedded,
Provide a connecting part to connect the connecting means to the male hardware ,
The connecting means and the connecting portion are configured by screws, and an engaging portion of a screw fastening tool is provided on the male metal object.
A segment characterized by that.

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