JP3453690B2 - Composite segment joint structure - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a segment used for lining a shield tunnel, and more particularly to a joint structure of a synthetic segment obtained by synthesizing (integrating) steel and concrete. About. 2. Description of the Related Art Conventionally, as a joint structure of a composite segment (called "NM segment") in which a steel frame surrounding four sides with H-shaped steel is filled with unreinforced or RC-structured concrete. There were two types: (1) Type not using pin connection As shown in FIG.
Forming the fitting step portions 3 and 4 having a cross section,
Simply match 4 For details, see JP-A-4-33019.
No. 7 is described. (2) Pin connection type As shown in FIGS. 24 and 25, in addition to the fitting structure shown in FIG. 23, a plate-like female joint 5 provided on one steel frame 1 between segments is provided. Into the plurality of holes 6 of the other steel frame 1
A plurality of connection pins 7 which are male joints provided in the first and second connectors are fitted. [0005] However, although the joint structure of (1) is simple in structure, there is no portion that can bear the tensile force between the segments, and the ring as a ring is formed only by the attachment effect of the staggered set. Because of the rigidity, the segments become thick and uneconomical. [0006] In the joint structure (2), the axial tensile force and the bending tensile force can be shared, so that the load on the segment body is reduced and the segment thickness can be reduced as compared with the joint structure (1). However, due to restrictions on the pin arrangement, it is possible to provide only a joint strength of about 20% of the strength of the segment body. In addition, under the condition that large internal water pressure acts, it will be expected to be the soaking effect,
Considering the heavy burden on the segment body,
The segment thickness must be increased. SUMMARY OF THE INVENTION In view of the above problems in the prior art, it is an object of the present invention to significantly improve the tensile rigidity and bending rigidity of a joint without using a special joint fitting, and to improve the segment body. Not only can it be thinner,
It is an object of the present invention to provide a joint structure of a synthetic segment that can improve segment assembling accuracy, water stoppage at a joint portion, and workability of joint construction. [0008] A joint structure according to the present invention is characterized in that:
In a synthetic segment in which concrete is filled in a frame of a steel frame having a shaped cross section and an outward fitting portion and an inward fitting portion provided on a flange of the steel frame are fitted to each other, an outward fitting portion is provided. Was formed integrally with the flange as a J-shaped cross section with a convex portion at the tip and a concave portion following the same, and the inward fitting portion was formed on the flange as an inverted J-shaped cross section with a convex portion at the distal end and a concave portion following the concave portion. In addition to being formed integrally, the outer tip corner of the projection of the outward fitting part and the inner tip corner of the projection of the inward fitting part are rounded, and the outward fitting part is correspondingly formed. The rounded corners of the concave part and the concave part of the inward fitting part are rounded, and the convex part of the outward fitting part and the concave part of the inward fitting part are fitted without any gap. The concave part of the direction fitting part and the convex part of the inward fitting part fit without gap, and the flanges of the steel frame Characterized by being adapted to continuously face with flush. According to the present invention, the fitting portion having the J-shaped cross section provided on the flange of the steel frame and the fitting portion having the inverted J-shaped cross section are fitted without any gap, so that they are engaged with each other with their separation restricted. ,
A joint structure having high tensile stiffness and bending stiffness and high water-stopping properties is obtained. Next, an embodiment of the present invention will be described in detail with reference to the drawings. 1 and 2 show a joint structure according to a first embodiment of the present invention. In the two composite segments 10 shown here, a steel skin plate 12 is arranged on one of inner and outer surfaces (an outer surface in the figure) of an H-shaped steel frame 11 surrounding four sides, and one surface is opened. A concrete-filled space is formed, and its opening is temporarily closed with a cover plate (not shown) to fill the concrete-filled space with concrete 13, and after the concrete is hardened, the cover plate is removed.
As shown in FIG. 3, the entirety of one composite segment 10 is partially simplified, and as a whole, the plane is a rectangle that is long in the tunnel circumferential direction, but is curved in and out of the tunnel (thickness direction). Hereinafter, when this synthetic segment 10 is to be distinguished from other types of synthetic segments, “A-type segment 1
0A ". FIGS. 1 and 2 show only one long-sided steel frame 11 of one of the two composite segments 10, but one long-sided steel frame 11 of each of the composite segments 10.
An outward fitting portion 17 having a J-shaped cross section and an inward fitting portion 18 having an inverted J-shaped cross section are integrally formed on the inner and outer flanges 14 and 15, and the inner and outer flanges 14 and 15 on the other long side are formed. , Reverse J
Inward fitting part 19 of J-shaped section and outward fitting part 2 of J-shaped section
0 are integrally formed. These fitting portions serve as joints between rings between the two composite segments 10 and are symmetrical between the two composite segments 10. That is, the outwardly fitting portion 17 having a J-shaped cross section
Reference numeral 20 denotes convex portions 23 and 28 at the tip and concave portions 21 and
26 faces the outside of the composite segment 10, and the inward fitting portions 18 and 19 of the inverted J-shaped cross section have the convex portions 24 and 27 and the concave portions 22.5 at the distal ends facing the inside of the composite segment 10.
As shown in an enlarged view of the outer flange 14 in FIG. 4, in order to facilitate fitting and prevent breakage, the outer tip corner of the convex portion 23 of the outward fitting portion 17 and the inward fitting portion are formed. 19
Are rounded (the ridge line of the cross section is a curve) with the inner tip corner of the convex portion 27, and the corner of the concave portion 21 of the outward fitting portion 17 and the concave portion 25 of the inward fitting portion 19 are correspondingly provided. The corners are rounded. In the other portions, the ridge lines of the cross sections of both the convex portions and the concave portions are straight. The outward fitting portion 20 and the inward fitting portion 18 have a similar relationship. Although not shown, the flanges 14a and 15a of the steel frame 11a on the short side of the composite segment 10 are also provided with a fitting portion serving as an inter-segment joint in the same manner as the above-described inter-ring joint. Joining of the ring-to-ring joint having the above structure is performed as follows. As shown in FIG. 4, the composite segment 10 to be installed is pushed straight toward the composite segment 10 of the installed ring as shown by the arrow, and the fitting portion 1 of the flanges 14 and 15 of the former segment is pushed.
7 and 18 are brought into engagement with the fitting portions 19 and 20 of the flanges 14 and 15 of the latter segment. The flanges 14 and 15 are made of steel, and the fitting portions 17 to 20 have concave portions 21 and 22.2.
5 and 26, as shown in FIG.
8 and the projections 27.2 of the fitting portions 19 and 20
8 instantaneously warp to the opposite sides, and the warp is restored, so that the former convex portion is pushed into the latter concave portion as shown in FIG. 6, and at the same time, the latter convex portion is fitted to the former concave portion. And press fit. This fitted state is maintained by the weight of the segments, the protrusions and recesses fit together without gaps, and the flanges of the steel frame are flush with each other on the inner and outer surfaces. Thereafter, the space formed between the steel frames 11 of the rings is filled with a solidifying filler 29 such as mortar as shown in FIG. On the other hand, with regard to the inter-segment joint, the combined segment 10 to be installed is staggered in the tunnel axial direction with respect to the already-installed combined segment 10, and one end of the fitting portion of both is joined. Fit while sliding straight. After this, the steel frame 1 between the segments
The space formed between 1a and 11a is filled with a filler such as mortar. According to the joint structure between rings and between segments, the outwardly fitting portion having a J-shaped cross section and the inwardly fitting portion having an inverted J-shaped cross section mesh between the rings and between the segments. Regarding the joint between rings, it does not come off in both the inside and outside directions of the tunnel and the axial direction of the tunnel,
In addition, the inter-segment joint does not come off in the inside and outside of the tunnel and in the circumferential direction of the tunnel. Since such joints are provided on the inner and outer flanges of the steel frames 11 and 11a of the composite segment 10, a joint structure having high tensile rigidity and bending rigidity and high segment assembly accuracy is obtained. FIG. 7 shows an A-type joint in which both the ring-to-ring joint and the segment-to-segment joint have a fitting structure of the outward fitting portion having the J-shaped cross section and the inward fitting portion having the inverted J-shaped cross section as described above. An example of assembling the segment 10A is shown. In this case, one end of the steel frame 11a on the short side of the A-type segment 10A to be installed is aligned with the other end of the steel frame 11a of the installed A-type segment 10A, and a joint J between these A-type segments is formed. While slidingly fitting the outward fitting portion of the cross section and the inward fitting portion of the inverted J shape section, push the A-shaped segment 10A to be installed, and the outward direction of the J-shaped section serving as a joint between the rings. The fitting portion and the inward fitting portion having the inverted J-shaped cross section are pushed and fitted to the inward fitting portion having the inverted J-shaped cross section and the outward fitting portion having the J-shaped cross section of the installed segment. Next, FIGS. 8 to 13 show a case where the joining of the inter-segment joints of the A-type segments 10A is made easier than in the above-described example. FIG.
0 is the position of the line aa in FIG. 8, FIG. 11 is the position of the line bb in FIG.
2 is an enlarged cross section taken along line cc in FIG. 9, and FIG. 13 is an enlarged cross section taken along line dd in FIG. The fitting portion of the steel frame 11 on the long side serving as the inter-ring joint is similar to the outward fitting portion having the J-shaped cross section as in the above-described example.
Although the fitting sections 30 and 31 of the steel frame 11a on the short side that becomes the inter-segment joint have an inward fitting section having a shaped cross section, the fitting sections 30 and 31 have a simple L section and an inverted L section. In this case, as shown in FIG. 8, the joining between the segments is performed while the A-type segment 10A to be installed is staggered in the tunnel axial direction with respect to the installed A-type segment 10A. L-shaped section 3
Then, the former segment is slid in the axial direction of the tunnel with respect to the latter segment simply after the 0 and the fitting portion 31 having the inverted L-shaped cross section are simply butted. Steel frame 1 on the short side of both segments
When the total length of 1a matches as shown in FIG. 9, between the rings, the fitting portion of the J-shaped cross section and the fitting portion of the inverted J-shaped cross section are pushed into each other and engaged with each other as in the above example. As shown in FIG. 12, one end of each of the fitting portions 17 and 20 of the J-shaped cross section of the inner and outer flanges of each segment and one end of the fitting portions 18 and 19 of the inverted J-shaped cross section slide between the segments. The flanges of the steel frame are fitted and meshed with each other, and the inner and outer surfaces of the steel frame are flush with each other, including the meshed fitting portions. As for the joint between the segments, it is sufficient that only the girder portion as the ring structure is connected, so there is no problem with such a structure. FIGS. 14 to 19 show that a composite segment (B-type segment) 10B having one short side as the hypotenuse is shown in FIG.
An example is shown in which a trapezoidal composite segment (K-shaped segment) 10K is inserted and fitted. In the joint between the segments of the K-shaped segment 10K, the fitting portions 34 and 35 (a portions in FIG. 15) of the steel frames 32 and 33 on both sides in the tunnel axial direction have a J-shaped cross section and an inverted J shape as shown in FIG. The cross-sections of the steel frames 36 and 37 on both sides in the circumferential direction of the tunnel
9 (portion b in FIG. 15) has an L-shaped cross section and an inverted L-shaped cross section as shown in FIG. B-type segment 10B
As shown in FIG. 18, the fitting portions 41 and 42 of the steel frames 40 on both sides in the tunnel axial direction have an inverted J-shaped cross section and a J-shaped cross section, as shown in FIG. The fitting portions 44 and 45 of the steel frames 43 on both sides in the circumferential direction of the tunnel are also J
It has a J-shaped section and an inverted J-shaped section. Therefore, the K-shaped segment 10K and the B-shaped segment 10B are the same as the K-shaped segment 10K shown in FIG.
In a portion a of K, as shown in FIG. 18, the fitting portions 34 and 42 of the J-shaped cross section and the fitting portions 35 and 41 of the inverted J-shaped cross section are slidably engaged with each other, and the K-shaped segment 10K Part b
As shown in FIG. 19, the fitting portion 38 having the L-shaped cross section and the fitting portion 39 having the inverted L-shaped cross section slide with the fitting portion 44 having the inverted J-shaped cross section and the fitting portion 45 having the J-shaped cross section. Dynamic fit. FIG. 20 shows an example in which only a trapezoidal K-shaped segment 10K is used.
This is the same as the structure shown in FIG. 21 and 22 show the order of assembling the segments in this case, with the segments without hatching preceding and the segments following hatching subsequent. As described above, according to the present invention, the outward fitting portion having the J-shaped cross section and the inward fitting portion having the inverted J-shaped cross section provided on the flange of the steel frame are mutually connected. The convex and concave portions are fitted together without any gaps, and the meshing condition restricts the separation from each other.
In addition, since the flanges of the steel frame are continuous with each other on the inner and outer surfaces, including both the engaged portions, a joint structure having high tensile stiffness and bending stiffness and high water stopping property can be obtained. Further, not only can the thickness of the segment body be reduced, but also the accuracy of assembling the segment and the workability of joint construction can be improved. The outer tip corner of the convex part of the outward fitting part and the inner tip corner of the convex part of the inward fitting part are rounded, and correspondingly, the concave part of the outward fitting part is rounded. Since the corners and the corners of the concave portion of the inward fitting portion are also rounded, the fitting can be performed easily and the breakage at the time of fitting can be prevented.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing a joint state of a joint structure according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of the same state before bonding. FIG. 3 is a perspective view of one composite segment. FIG. 4 shows a joint between a J-shaped cross section and a reverse J in a joint between rings.
It is sectional drawing which shows the state before fitting of the fitting part of a cross section. FIG. 5 is a cross-sectional view of the same fitting process. FIG. 6 is a sectional view after fitting. FIG. 7 is a plan view showing an example of assembling the A-type segment. 8 to 13 show an example of assembling the A-type segment different from FIG. 7, and FIG. 8 is a plan view before assembling. FIG. 9 is a plan view after assembly. FIG. 10 is an enlarged sectional view taken along line aa of FIG. 11 is an enlarged sectional view taken along line bb of FIG. 8; FIG. 12 is an enlarged sectional view taken along line cc of FIG. 9; FIG. 13 is an enlarged cross section taken along line dd of FIG. 9; 14 to 19 show an example of assembling a K-shaped segment, and FIG. 14 is a plan view before assembling. FIG. 15 is a plan view of a K-shaped segment. FIG. 16 is a sectional view of an inter-ring joint portion of a K-shaped segment. FIG. 17 is a sectional view of an inter-segment joint portion of a K-shaped segment. FIG. 18 is a cross-sectional view of the fitted state of the joint between rings. FIG. 19 is a sectional view of a fitting state of the inter-segment joint. FIG. 20 is a plan view of an example of assembly using only K-shaped segments. FIG. 21 is a front view showing the assembling order of the above. FIG. 22 is a side view of the same. FIG. 23 is a sectional view of a conventional example that does not rely on pin connection. FIG. 24 is a sectional view of a conventional example by pin connection. FIG. 25 is an enlarged sectional view taken along line AA of FIG. 24; [Description of References] 11 Steel frame 14/15 Flange 17/20 Outward fitting part 18/19 Inward fitting part 21/22/25/26 Concave part 23/24/27/28 Convex part

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Kiyotaka Suda               2-5-8 Kitaaoyama, Minato-ku, Tokyo Stock               In company                (56) References JP-A-4-330197 (JP, A)                 Shokai Sho 59-163699 (JP, U)                 Actual opening Hei 7-12598 (JP, U)

Claims (1)

(57) [Claims 1] A concrete frame is filled in a steel frame having an H-shaped cross section, and an outward fitting portion and an inward fitting portion provided on a flange of the steel frame. In the synthetic segment that fits each other, the outward fitting portion is formed integrally with the flange as a J-shaped cross section formed by a convex portion at the tip and a concave portion following the convex portion. The flange is formed integrally with the flange as an inverted J-shaped cross section formed by a convex part at the tip and a concave part following the convex part of the convex part of the outward fitting part and the convex part of the inward fitting part. The inner tip corner is rounded, and correspondingly, the corner of the recess of the outward fitting portion and the corner of the recess of the inward fitting portion are also rounded. And the concave portion of the inward fitting portion are fitted without any gap, and the concave portion of the outward fitting portion and the inner portion are not fitted. Joint structure of the synthetic segments and the convex portion of the feeder fitting portion fitted without clearance, the flange between the steel frame is such that a continuous inner and outer both surfaces flush, characterized by.