JP3349096B2 - Segment ring-to-ring seismic joint and segment using this - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a segment-to-ring seismic joint for use in a shield method or the like and a segment using the same. The “segment” in the present invention has a broad concept including a concrete block.

[0002]

2. Description of the Related Art In a shield method, as a support or a primary lining of an excavation pit, a method is employed in which a required number of segments are assembled in an annular shape along the inner peripheral surface of the excavation pit and excavation is advanced. Piece-to-piece joint end faces are formed at both ends of each of the segments assembled in an annular shape, and piece-to-piece joints for connecting the segments in the circumferential direction are provided on the piece-to-piece joint end faces.

FIGS. 4A and 4B show an example of a conventional ring-to-ring joint 2 in a segment 1. FIG. The inter-ring joint 2 is a joint for assembling the next segment 1 joined to one end of the annularly assembled segment 1 in the longitudinal direction, and includes a male joint 4 provided on one segment 1. And a female joint 4 'provided on the mating segment 1 which is joined in the length direction.

The male joint 4 has a box-shaped housing 6 opened on the inner surface fixed to a corner formed by one of the inter-ring connecting end surfaces 5 of the segment 1 and the inner surface. A joint bolt 8 is inserted into a hole 7 provided on the surface, and the joint bolt 8 is inserted into a hole 7 'of a similar housing 6' of the mating segment 1, and the housing 6 '
The inside is fixed by a nut 8 '. When the secondary lining is not applied after the assembly of the segment 1, the mortar is filled in the housings 6, 6 '.

[0005] In the figure, reference numeral 9 denotes a piece-to-piece joint.

[0006]

In the conventional ring-to-ring joint 2 as described above, when the segments 1 are assembled together, the nut 8 'is prevented from rotating in the housing 6' of the female joint 4 '. It is necessary to perform the turning operation of the joint bolt 8 in the housing 6 of the male joint 4, but it is necessary to insert a tool into the narrow housings 6, 6 'to stop or perform the turning operation. Had a bad problem.

At the time of manufacturing the segment 1,
Each housing 6, 6 'must be filled with suitable padding to prevent concrete from entering the interior,
Further, when the secondary lining is not performed after the assembly at the work site, the work of filling the mortar into the housings 6 and 6 'is necessary as described above, which causes a reduction in the production efficiency and the construction efficiency.

Further, the above-mentioned mortar filling, 2
Even if the housings 6 and 6 'are closed by the application of the next lining, it is difficult to finish the housing completely, and it is difficult to avoid a slight recess of the housings 6 and 6'.

[0009] On the other hand, if an earthquake or ground deformation affects the tunnel constructed by the segments after the construction, there is a possibility that the inter-ring joint 2 may be broken in the above-mentioned conventional joint structure.

It is therefore an object of the present invention to provide a joint between rings that is hardly affected by an earthquake or the like and a segment using the joint, while improving the efficiency of assembling the segments.

[0011]

In order to solve the above-mentioned problems, an inter-ring joint according to the present invention comprises a male joint at one end of each inter-ring joint of two adjacent segments and a female joint at the other end. In the inter-ring joint of the segment provided, the male joint is provided with a screw shaft portion at the tip of a joint fitting protruding from the inter-ring coupling end face of the one segment,
An annular boss portion of the anchor member is loosely fitted to the screw shaft portion, and the boss portion is tightened by a nut via an elastic washer, and a tip end portion of the anchor member is formed longer than the shaft portion. A plurality of slits are provided over a required range in the length direction from the tip of the anchor joint to form a plurality of anchor legs, the female joint is provided with a projection on the bottom surface of the cylindrical body that receives the anchor member and the fitting hardware, The outer diameter of the projection is the same as or slightly larger than the inner diameter of the plurality of anchor legs, and has a gap between the projection and the inner surface of the cylindrical body into which the anchor leg is forcibly fitted. The tensile force acting on the coupling end between the rings is absorbed by compressively deforming the elastic washer between the anchor member and the nut. One in which the.

A structure in which frictional irregularities are formed on the outer surface of the anchor leg, or a structure in which friction irregularities pressed against the outer peripheral surface of the joint fitting are formed on the inner peripheral surface of the cylindrical body. it can.

[0013] In order to solve the above-mentioned problems, a segment according to the present invention is provided with a male joint at one inter-ring joint end of a segment body and a female joint at the other inter-ring joint end. In the segment, the male joint is provided with a screw shaft at the tip of a joint fitting protruding from the inter-ring joint end face of the one segment, and the annular boss of the anchor member is loosely fitted to the screw shaft. , Tighten the boss with a nut via an elastic washer,
The distal end portion of the anchor member is formed longer than the shaft portion, and a plurality of slits are formed over a required range in the length direction from the distal end of the anchor member to form a plurality of anchor legs. A projection is provided on the bottom surface of the cylinder for receiving the anchor member and the fitting hardware, and the outer diameter of the projection is the same as or slightly larger than the inner diameter of the plurality of anchor legs, and The anchor leg is formed in such a size as to have a gap into which the anchor leg is forcibly fitted, and the tensile force acting on the coupling end between the rings is caused by the elasticity between the anchor member and the nut. The washer is compressed and deformed to absorb the washer.

It is to be noted that a configuration in which frictional irregularities are formed on the outer surface of the anchor leg, and a configuration in which frictional irregularities pressed against the outer peripheral surface of the joint fitting are formed on the inner peripheral surface of the cylindrical body. be able to.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to FIG.
3 will be described based on the segment for the siludo method shown in FIG.

As shown in FIG. 1, each of the segments 10 is assembled in an annular shape by abutting the inter-piece connecting surfaces 11 formed at both ends in the circumferential direction, and furthermore, the same segments 10 are arranged in the longitudinal direction. Then, these inter-ring connecting surfaces 20 are joined to each other by an inter-ring joint 12.

The above-mentioned inter-ring joint 12 is constituted by a male joint 13 and a female joint 13 '. In the case of the segment 10 shown in FIG.
Is provided.

Each of the segments 10 includes a segment body 14 made of reinforced concrete, the male joint 13 partially exposed at one of the inter-ring connecting surfaces 20, and the above-mentioned male joint 13 partially exposed at the other inter-ring connecting surface 20. And a female joint 13 '. Further, a male joint 31 and a female joint 31 ′ constituting the inter-piece joint 30 are provided on the inter-piece coupling surface 11, respectively.

The male joint 13 is, as shown in FIG.
At one inter-ring coupling surface 20, a bottomed screw cylinder 15 is fixed to a reinforcing bar 16 and buried in the segment body 14.
A fitting hardware 17 is screwed to the bottomed screw cylinder 15,
The joint hardware 17 protrudes from the inter-ring coupling surface 20.

In the above-mentioned joint hardware 17, a screw portion 18 is formed at the rear portion of the shaft portion 19 to be screwed to the bottomed screw cylinder 15, and a small-diameter screw shaft portion 21 is formed at the center of the front end of the shaft portion 19. It is formed. A step portion 19 'is formed in the middle of the shaft portion 19, and a tip end side of the step portion 19' has a slightly smaller diameter.

A boss 23 of an anchor member 22 having the same diameter as the distal end of the shaft 19 is loosely fitted to the screw shaft 21 with a required gap. An elastic washer 24 is fitted on the boss 23 and further tightened with a nut 25, thereby tightening the boss 23 via the elastic washer 24.

The anchor member 22 is formed to be longer than the screw shaft 21 and is formed with four slits 26 extending from its tip to the boss 23 so that four anchor legs 27 are provided integrally with the boss 23. Can be Each anchor leg 2
Reference numeral 7 is formed closer to the outer periphery of the boss 23, and a step 23 'to which the elastic washer 24 contacts is provided inside the anchor leg 27 thereof. Further, a saw-tooth unevenness 28 is formed on the outer surface of the distal end portion of each anchor leg 27.

The elastic washer 24 is made of high-strength, low-rigidity plastic, and a conventionally known seismic washer is used (Japanese Patent Publication 3-5).
No. 6323, Japanese Patent Publication No. 5-39396).

Next, the female joint 13 'provided on the inter-ring connecting surface 20 opposite to the segment 10 provided with the male joint 13 and the mating segment 10 having the same structure as the female joint 13' are provided.
As shown in FIG. 2, the female joint 13 ′ provided on the inter-ring coupling surface 20 is fixed to the reinforcing bar 16 and
4, a tubular body 29, a closing lid 32 screwed to the bottom surface thereof, and a projection 33 projecting from the inner surface of the closing lid 32.

The above-mentioned projections 33 are provided on the respective anchor legs 2.
7 is formed in the shape of a column having the same diameter as or slightly larger than the inner diameter of the projection 7, and the gap between the outer peripheral surface of the projection 33 and the inner peripheral surface of the cylindrical body 29 is forcibly fitted by the anchor leg 27. It is set to the size that is. The tip of the projection 33 is formed in a spherical shape as shown in the figure, and in some cases, a conical surface. In addition, a screw groove 34 is formed on the inner peripheral surface of the inlet portion of the cylindrical body 29, and the inner diameter of the screw groove 34 is set to a size that can be forcibly fitted to the large diameter portion of the shaft portion 19. .

The inter-ring joint 12 and the segment 10 using the same according to the embodiment are as described above. When the segment 10 is formed, the reinforcing bar 1 is placed in a separate mold.
After the male joint 13 and the female joint 13 ′ of the inter-ring joint 12 and the male joint 31 and the female joint 31 ′ of the inter-piece joint 30 are fixed to a part of the reinforcing bar 16,
A molding method of casting concrete is used.

At the construction site of the shield method, a required number of segments 10 are connected by a piece-to-piece joint 30 while being arranged in an annular shape as shown in FIG. To join.

The coupling between the ring joints 12 is performed by connecting each male joint 13 of the segment 10 and the female joint 1 of the mating segment 10.
After aligning the core of 3 ', push it in with the shield jack installed for the shield method. Then, the anchor member 22 of the male joint 13 enters the inside of the cylindrical body 29, the anchor leg 27 of the male member 13 abuts against the tip of the projection 33 and separates in four directions, between the projection 33 and the inner peripheral surface of the cylindrical body 29. It is forcibly inserted. At the same time, the unevenness 28 cuts into the inner peripheral surface of the cylindrical body 29 to generate a large frictional resistance. The large-diameter portion of the shaft portion 19 is also forcibly fitted into the thread groove 34 of the cylindrical body 29, and also generates a large frictional force in this portion (see FIG. 3).

As described above, the male joint 13 and the female joint 1
3 ′, and in the tunnel where the segments 10 are sequentially connected in the longitudinal direction, when a tensile force acts on the inter-ring connection surface 20 due to an earthquake, ground deformation, or the like, the male joint 1
A nut 25 integral with the joint hardware 17 on the third side and the female joint 1
Boss 2 of anchor member 22 integral with 3'-side tubular body 29
By the third step, the elastic washer 24 is compressed and deformed to absorb its tensile force, thereby preventing the inter-ring joint 12 from being broken. Also, the joint hardware 17 opposes the shearing force acting on the inter-ring joint surface 20.

Since the compressive force acting on the inter-ring connecting surface 20 acts on the end face of the segment body 14, it is opposed by the strength of the segment body 14.

Although the above embodiment has been described with reference to the shield method segment, the present invention relates to the segment 1 method.
It can also be applied to the connection of concrete blocks such as 0.

[0032]

As described above, according to the present invention, the inter-ring joint surfaces of the two segments are butted, and the male joint of the inter-ring joint is forcibly fitted to the female joint.
In other words, the segments can be connected in the longitudinal direction by a one-touch operation, and no recess is formed on the inner surface of the segment, so that it is not necessary to close the recess, and the construction efficiency can be significantly improved. .

Further, since the elastic washer is interposed in the inter-ring joint, the tensile force due to an earthquake or the like can be easily absorbed to prevent the destruction of the inter-ring joint.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an assembled state of a segment according to an embodiment.

FIG. 2 is a partial cross-sectional view before the connection in the above.

FIG. 3 is a partial cross-sectional view after connection according to the first embodiment;

4A is a partially exploded perspective view of a conventional example. FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Segment 11 Joint surface between pieces 12 Joint between rings 13 Male joint 13 'Female joint 14 Segment body 15 Bottom threaded tube 16 Reinforcing bar 17 Joint hardware 18 Screw portion 19 Shaft portion 19' Step portion 20 Ring joint surface 21 Screw shaft portion 22 Anchor Member 23 Boss 23 'Step 24 Elastic Washer 25 Nut 26 Slit 27 Anchor Leg 28 Irregularity 29 Cylindrical Body 30 Piece Joint 31 Male Joint 31' Female Joint 32 Closure Lid 33 Projection 34 Screw Groove

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tsuyoshi Miyahara 961 Toendo, Aichigawa-cho, Aichi-gun, Shiga Prefecture Inside Kurimoto Concrete Industry Co., Ltd. 47 at address 373 (56) References JP-A-2-176097 (JP, A) JP-A-10-102992 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E21D 11 / 04

Claims (6)

(57) [Claims] 1. An inter-ring joint of a segment comprising a male joint at one of the coupling ends of each ring of two adjacent segments and a female joint at the other, wherein the male joint is provided between the rings of the one segment. A screw shaft portion is provided at the tip of a joint fitting protruding from the coupling end surface, and an annular boss portion of an anchor member is loosely fitted to the screw shaft portion, and the boss portion is tightened with a nut via an elastic washer. The distal end portion of the anchor member is formed to be longer than the shaft portion, and a plurality of slits are formed by providing a plurality of slits over a required range in the length direction from the distal end of the anchor member. A projection is provided on the bottom surface of the cylindrical body for receiving the anchor member and the fitting hardware, and the outer diameter of the projection is the same as or slightly larger than the inner diameter formed by the plurality of anchor legs, and And the inner diameter surface of the cylindrical body is formed in such a size as to have a gap into which the anchor leg is forcibly fitted. The tensile force acting on the inter-ring coupling end portion is provided by the anchor member and the nut. A seismic joint between rings of segments, wherein the elastic washer is compressed and deformed to absorb the elastic washer. 2. The joint between rings of a segment according to claim 1, wherein irregularities for friction are formed on an outer surface of said anchor leg. 3. The segment-to-ring seismic joint according to claim 1, wherein an irregular surface for friction pressed against an outer peripheral surface of the joint fitting is formed on an inner peripheral surface of the cylindrical body. . 4. A segment in which a male joint is provided at one inter-ring joint end of a segment body and a female joint is provided at the other inter-ring joint end, wherein the male joint is an inter-ring joint of the one segment. A screw shaft is provided at the tip of a joint fitting protruding from an end face, and an annular boss of an anchor member is loosely fitted to the screw shaft, and the boss is tightened with a nut via an elastic washer, and the anchor is fixed. The distal end portion of the member is formed longer than the shaft portion, a plurality of slits are provided over a required range in the length direction from the distal end of the anchor member, and a plurality of anchor legs are formed. A projection is provided on the bottom surface of the cylindrical body for receiving the anchor member and the fitting hardware, and an outer diameter of the projection is equal to or slightly larger than an inner diameter formed by the plurality of anchor legs, and And the inner diameter surface of the cylindrical body is formed in a size having a gap into which the anchor leg is forcibly fitted. The tensile force acting on the coupling end between the rings is provided by the anchor member and the nut. A segment that absorbs the elastic washer by compressively deforming the elastic washer. 5. The segment according to claim 4, wherein irregularities for friction are formed on the outer surface of the anchor leg. 6. The segment according to claim 4, wherein an uneven surface for friction pressed against an outer circumferential surface of the joint fitting is formed on an inner circumferential surface of the cylindrical body.