JPH07103786B2 - Segment joint structure - Google Patents

Description

The present invention relates to a joint structure for a segment used in a tunnel shield construction method.

(Prior Art) Conventionally, there are straight bolt joints, bent bolt joints, and the like as segment joints provided for fastening segment pieces, and these are performed by bolt fastening.

(Problems to be Solved by the Invention) The number of bolts, positions, etc. in the bolt joint are determined in consideration of prestress, bending moment, tensile stress, etc., but the bolt penetrates the joint member forming the joint surface. However, the fastening position is limited, and it is difficult to improve the bending strength.

That is, the bending strength of the joint portion is the strength of the joint member multiplied by the distance from the bolt to the bending center (joint member / outer edge), but the bolt penetrates the central portion of the joint surface and -Since it is difficult to provide it at the outer edge or in the vicinity thereof, it is difficult to increase the distance to the bending center and it is difficult to increase the bending strength.

Further, in the case of a bolt joint, the construction cost is high because the number of man-hours for bolt fastening work is large and time-consuming.

The present invention prevents the separation of the segment piece in the circumferential direction by connecting the segment beams by fitting the male and female claw portions and the concave-convex engaging portions provided on the segment joint portion, and further, the problems of the conventional art. An object of the present invention is to provide a joint structure for a segment in which all the points can be solved.

(Means for Solving the Problem) A specific configuration for solving the problem in the present invention is a joint structure of a segment that joins circumferential end portions of adjacent segments in the circumferential direction in a joint structure 4A of one segment 1.
Includes the engaging portion PQ having a concave-convex shape in the middle portion in the radial direction, and the engaging portion PQ.
Male and female nail parts MA and WA on the inner and outer peripheral sides of PQ are formed,
The fitting portion 4B of the other segment 1 is brought into surface contact with the fitting portion 4A of the one segment 1 while being axially displaced, and then axially aligned so that the engaging portion PQ
And the engaged portion QP that engages with each other to fix the radial relative positions of the segments 1 and 1, and engages with the male and female pawl portions MA and WA, respectively, to fix the circumferential relative position of the segments 1 and 1. Male and female nail part M
B and WB are formed respectively.

(Working) The joint portion 4A of one segment 1 is brought into surface contact with the joint portion 4B of the segment 1 circumferentially adjacent thereto in the state of being displaced in the width direction, and the axial position is aligned. When the segment 1 on the joining side is slid in the axial direction, the engaging portion PQ and the engaged portion QP in the radial middle portion are engaged,
It will not move inward and outward in the radial direction, and it will be possible to counter the shearing force, and at the same time, the male and female pawls MA, WA and the male and female pawls MB, WB on the inner and outer peripheral sides of the engaging part PQ and the engaged part QP. Are engaged with each other to fix the relative positions of the joint portions 4A and 4B in the circumferential direction, so that the bending moment can be counteracted.

(Example) Hereinafter, the Example of this invention is described based on drawing.

In the first embodiment shown in FIGS. 1 to 4, 1 is a segment used as an A-type segment (standard segment) and a B-type segment (key adjacent segment), and in the circumferential direction together with the K-type segment 2 shown in FIG. Assembled side by side to form one piece of the segment ring.

The segment 1 forms a box-shaped frame body 7 with joint portions 4 forming joint surfaces 3 at both ends in the circumferential direction, main girder portions 5 at both ends in the axial direction, and a skin plate 6 forming an inner peripheral surface. It is formed by filling concrete 8 in the frame 7,
Reinforcing bars may be embedded in the frame body 7.

The main girder portion 5 is formed with a plurality of through holes 9 such as bolts for forming an inter-ring joint structure at a constant pitch in the circumferential direction. Instead of the hole 9, a pin or a hook for a pin-hoso joint may be provided.

The joint portions 4 at both ends in the circumferential direction of the segment 1 have a male-female inverted shape, and one joint portion 4A of the segment 1 has a shape capable of engaging with the other joint portion 4B of the segment 1 adjacent thereto. There is.

On the joint surface 3A of the one joint portion 4A, the male pawl portion MA is provided on the outer peripheral surface 11 side.
However, female claws WA are axially separated from each other on the inner peripheral surface 12 side.
It is formed point by point. The male claw portion MA has a recess a, a protrusion b, and a tapered surface c located between them.
The female claw portion WA has a projection d that projects radially inward from the inner peripheral surface 12 and a taper surface e on the back surface thereof.

Further, on the joint surface 3A, a convex portion PA and a concave portion QA, which serve as the concave and convex engaging portions PQ, are formed on both sides in the axial direction of the middle portion in the radial direction.

The joint surface 3B of the other joint portion 4B is substantially male-female symmetrical with the one joint surface 3A, and is fitted on the outer peripheral side with the male pawl portion MA.
A claw portion WB having a convex portion g protruding via the depression f and a tapered surface h on the back surface thereof is formed, and a depression k formed by a protrusion j projecting radially inward on the inner peripheral side and A male claw portion MB having a tapered surface 1 is formed.

Further, convex-concave portions PB, QB as concave-convex engaged portions QP that are fitted to face the concave-convex portions PA, QA of the joint surface 3A are formed in the radial intermediate portion of the joint surface 3B. The two female nail parts WB
One of these is a long female claw WB whose axial length is about twice that of the other
The length of the long female claw portion WBL is formed to be longer than the sum of the axial lengths of the male claw portion MA and the convex portion PB engaging with the L female claw portion WBL.

The tapered surfaces c, e, h, l of the joint portions 4A, 4B are inclined in substantially the same direction with respect to the joint surfaces 3A, 3B, and have a taper in the axial direction.

The inner and outer radial surfaces of the engaging portion PQ and the engaged portion QP are the joint surfaces 3A and 3B.
Although it may be at right angles or inclined with respect to, a taper angle is provided in the axial direction like the tapered surfaces c, e, h, l.

That is, the joint portions 4A and 4B are displaced in the axial direction by the length of the uneven portion PB, and are displaced in the radial direction by the height of the protrusion b, and are abutted to each other, and the joint surfaces 3A and 3B are brought into surface contact (see FIG. 1). move in α direction),
The joint side of the segment 1 slides in the radial direction (β direction in Fig. 1) so as to align in the radial direction, and the male claw portions MA, MB are engaged with the female claw portions WA, WB to form an uneven shape. Engagement part PQ and engaged part QP
When the segment 1 is aligned in the radial direction and then the segment 1 is slid in the axial direction (γ direction in FIG. 1), all male and female pawls M and W are engaged at regular positions, and the segments 1 and 1 are circumferentially aligned. The relative position is fixed, and at the same time, the engaging portion PQ and the engaged portion QP are engaged to fix the radial relative position of the segments 1 and 1, and the tapered surfaces c, The taper surfaces of e, h, l and the concavo-convex parts P, Q are taper-joined to form the diameter parts 4A, 4B of both segments 1, 1.
Eliminate backlash.

The K-shaped segment 2 shown in Fig. 5 has joint portions 4B at both ends in the circumferential direction.
Of the B-shaped segment 1 ', which is opposed to each other on both sides thereof. The B-type segment 1'may be the same as the segment 1 shown in FIG. 1, but the K-type segment 2 may be used to ensure the key function of the K-type segment 2.
The joining surfaces 3A and 3B for joining the B-shaped segment 1'and the B-shaped segment 1'may be inclined with respect to the radial direction of the segment.

The second embodiment shown in FIG. 6 shows a steel or cast segment that is not filled with concrete. In the case of a steel segment, a box-shaped frame 7 is formed by welding a steel plate or using a shaped steel. Are formed, and uneven portions are formed on the front surface and the back surface side of the steel plates forming the joint portions 4A and 4B having the joint surfaces 3 at both ends in the circumferential direction.

One joint portion 4A has an outer peripheral male pawl portion MA formed by welding an L joint member to the steel plate surface, an inner peripheral female pawl portion WA formed by notching the steel plate rear surface, and the diameter of the steel plate surface. A horned agent is welded to a midway portion of the direction to form a convex portion PA and a notch portion to form a concave portion QA.

The other joint portion 4B has a shape in which the joint portion 4A is inverted inward and outward in the radial direction, and has an outer peripheral side female pawl portion WB, an inner peripheral side male pawl portion MB, and uneven portions PB, Q.
B is formed respectively, and moves in the α direction (circumferential direction) to move the joint surface 3
After the A and 3B are brought into surface contact with each other, the joint portions 4A and 4B are joined by locating in the β direction (radial direction) and aligning in the γ direction (axial direction).

One of the two female claws WA, WB of each joint 4A, 4B is a long female claw WAL, WBL, and both joints 4A, 4B are the inner and outer peripheral surfaces 11 of the segment. I don't have the luck of projecting from 12.

The third embodiment shown in FIG. 7 shows a segment made of reinforced concrete, and an L-shaped metal fitting 14 for forming male claw portions MA, MB of joints 4A, 4B on concrete 8 which mainly constitutes segment 1.
And a U-shaped metal fitting 15 forming the female claws WA, WB and a flat metal fitting 16 having a hole forming the pin groove 9 are embedded, and the recess Q and the projection P of the engaging tool PQ and the engaged part QP are formed. Is made of concrete itself.

In the third embodiment as well, as in the first and second embodiments, the segment 1 is sequentially moved in the α direction, the β direction and the γ direction for alignment to join the two segments.
The concave portion Q and the convex portion P may also be formed of metal fittings.

In the first to third embodiments, the long female claw portions WAL and WBL are formed, and the joint portions 4A and 4B are displaced from the radial direction by β.
The long female jaw WA
If the rear sides of L and WBL are left open to the joint surfaces 3A and 3B, the male claw portions MA and MB engaging with them will move only the circumferentially opposed movements of the joint portions 4A and 4B, and the female claw portion WA, It is possible to face WB in the axial direction. This is embodied in the fourth and fifth embodiments.

In the fourth embodiment shown in FIGS. 8 and 9, the segment 1 is made of steel or a casting mold, and the outer peripheral side male pawl portion MA and the inner peripheral side female pawl portion WA are provided in the joint portion 4A at one end in the circumferential direction. The recess QA of the midway engaging portion PQ is formed over the entire length in the axial direction at three axial positions, and the outer peripheral side female pawl portion WB and the inner peripheral side male pawl portion MB are formed in the joint portion 4B at the other end in the circumferential direction. Is formed, and the part to be engaged QP
Is formed over the entire length in the axial direction.

The male claw portions MA, MB of the respective joint portions 4A, 4B are the same as those in the above-mentioned embodiments, but the female portions WA, WB are adjacent to the portions engaging with the male claw portions MA, MB and have substantially the same length. It has an insertion portion 17, and the insertion portion 17 has a shape that can be inserted and removed by moving the male claw portions MA and MB opposite to each other in the circumferential direction.

Therefore, in the fourth embodiment, the two segments 1 are axially displaced by the length of the male claw portion M and are moved in the α direction from the state where the radial positions are aligned to bring the joint surfaces 3A and 3B into surface contact with each other. The male claw portion M is inserted into the insertion portion 17 by the above, the unevenness QA and the convex portion PB are tentatively fitted, and then slide in the γ direction (axial direction) to perform axial alignment, The portion M engages with the female claw portion W from the insertion portion 17, and the concave portion QA and the convex portion PB are completely fitted.

In the fourth embodiment, the concave portion Q is formed in the joint portion 4B and the convex portion P is formed.
Are formed on the joint 4A respectively, and the male and female claws M and W are formed in the axial direction 2
Alternatively, it may be formed at four or more locations.

FIGS. 10 and 11 show the cast segment of the fifth embodiment, the shape of the joint portion 4 is the same as that of the fourth embodiment, and the female claw portion W and the insertion portion 17 do not communicate with the inside of the segment. , It is formed in a hollow shape.

In the second to fifth embodiments, as in the first embodiment, the engagement of the portion corresponding to the protrusion b, j of the male claw M and the portion corresponding to the depression f, k of the female claw W is It has a taper surface in the axial direction so that it can be engaged by taper. The engaging part PQ and the engaged part QP.
The engagement may be straight engagement or taper engagement.

12 to 15 show a sixth embodiment, which is applicable to segments made of concrete, cast, steel or the like.

In the joint portion 4A of the segment 1 of the sixth embodiment, the convex portion PA and the concave portion QA which become the concave-convex engaging portions PQ are formed in the radial intermediate portion of the joint surface 3A, and the convex portion PA and the concave portion QA are different from each other. A segment 20 extends from the axially outer end of the segment to the center side and overlaps at the center side to form a step 20 between the convex PA and the center side end.

The joint part 4B has a plane symmetry shape with the joint part 4A, and has a convex portion PB and a concave portion.
It has an engaged QP consisting of QB, the concave portion QB faces the convex portion PA,
When the convex portion PB is opposed to the concave portion QA and the joint surfaces 3A and 3B are brought into surface contact while being displaced in the axial direction, the engaged portion QP engages with the engaging portion PQ at the incomplete position, When you align the directions,
The engaging portion PQ and the engaged portion QP are completely engaged, and their step portions 20
Engage in face-to-face contact with each other to fix the radial position of both segments 1, 1 and prevent separation in the circumferential direction.

The end faces of the respective projections P and the recesses Q on the axial center side of the segments are inclined surfaces 21 and 22, and are configured so that the circumferential coupling is further enhanced by the axial pressing force.

In each of the convex portions P, the width S in the segment radial direction has a joint surface 3A, 3
Although it is straight on the B side, on the tip side it is a straight line that is parallel to the segment axis direction from the inclined surface 21 to the middle, and it is a divergent shape from the middle part to the outer end, and this diverging part is the male part. It is a claw M. That is,
Male claws MA and MB projecting inward and outward from the axially outer ends of the convex portions PA and PB, respectively.

Correspondingly, the width of each recess Q in the segment radial direction is straight on the joint surfaces 3A, 3B side, but on the back side the inclined surface 22 is formed.
A straight line from the middle to the middle is parallel to the axial direction of the segment, and a female claw portion W is formed in a divergent shape from the middle part to the outer end part. That is, female claws WA and WB protruding inward and outward are formed at the axially outer ends of the recesses QP and QB, respectively.

In other words, the outer end of the convex portion P has a dovetail shape, and a pair of male claw portions M is continuously formed on the inner and outer peripheral sides, and the outer end of the concave portion Q has a dovetail groove shape and has an inner and outer peripheral portion. A pair of female claws W are continuously formed on the side, and the male and female claws M and W are engaged by axial alignment of the segments.

The male and female claw portions M and W may be only one of the inner and outer peripheral sides of the convex portion P and the concave portion Q. The male and female claws M and W have a joint surface 3 in the axial direction.
Since it also tapers in the direction away from the circumference,
By engaging in axial alignment, the two segments 1,1 provide a circumferentially and radial-tight coupling.

(Effect of the Invention) According to the present invention described in detail above, the adjacent segments 1, 1
By axially aligning the joint portions 4A, 4B of the above and then engaging and engaging, the assembling work can be performed easily and easily, and the construction cost can be reduced. Since the male and female claws M, W on the inner and outer circumferences of the joint surfaces 4A, 4B occlude, the distance from the bending center can be made larger than that by bolt fastening, and the bending strength can be improved, or the girder of the joint 4 The height can be reduced, and the concave and convex engaging parts PQ
Since the engaged portion QP is also engaged, the shear strength can be secured.

[Brief description of drawings]

1 to 4 show a first embodiment of the present invention. FIG. 1 is an exploded perspective view of an A-type segment, FIG. 2 is a side view of a joint portion, and FIG. 3 is a sectional side view of a segment. FIG. 4 is a front view of the joint portion 4A, and FIG. 5 is BK used in the first embodiment.
FIG. 6 is a side view showing the joint portion of the mold segment, FIG. 6 is an exploded perspective view showing the second embodiment, FIG. 7 is an exploded perspective view showing the third embodiment, and FIGS. 8 and 9 are the fourth embodiment. Exploded perspective view and exploded sectional view, FIGS. 10 and 11 are perspective views of one joint part showing the fifth embodiment and sectional views of the joint part, and FIGS. 12 to 15 show the sixth embodiment. 12 is an exploded perspective view, FIG. 13 is an exploded sectional view, and FIGS. 14 and 15 are a front view and a side view of the joint portion 4A. 1 ... Segment, 3 ... Joining surface, 4 ... Joint, 11 ...
... outer peripheral surface, 12 ... inner peripheral surface, W ... female claw portion, M ... male claw portion, P ... convex portion, Q ... recessed portion, PQ ... engaging portion, QP ... engaged portion .

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tsutomu Aiba 3-3-2 Nihombashi Muromachi, Chuo-ku, Tokyo Inside Kubota Iron Works Co., Ltd. (56) Reference JP-A-59-41515 (JP, A)

Claims (1)

[Claims] 1. In a joint structure of a segment for joining circumferential ends of adjacent segments in the circumferential direction, a joint portion (4A) of one segment (1) has an uneven engagement at a midway portion in the radial direction. Part (PQ) and male and female pawl parts (MA) (WA) on the inner and outer peripheral sides of the engaging part (PQ) are respectively formed, and the joint part (4B) of the other segment (1) is The joint portion (4A) of one segment (1) is brought into surface contact in a state of being displaced in the axial direction, and then axially aligned to engage with the engaging portion (PQ) and thereby the segment (1).
An engaged portion (QP) for fixing the radial relative position of (1),
Male and female claws (MB) (WB) that engage with the one male and female claws (MA) (WA) and fix the circumferential relative positions of the segments (1) (1) are formed respectively. The joint structure of the segment.