JP2568353Y2 - Concrete segment and segment joint structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete segment such as concrete, ductile or a composite of concrete and steel, and a joint structure of the segment.

[0002]

2. Description of the Related Art Concrete-based segments are superior in durability and rigidity to steel segments, and are used in large and medium-diameter tunnels. As for the concrete system segment, the joint surface of the peripheral edge is formed in a plane,
A bolt box is recessed around the inner periphery of the segment. In general, since the segments are designed as a ring body having uniform rigidity, the presence of the joint is a structural weak point. To compensate for this weakness, the joints are arranged in a staggered manner.
For waterproofing the joint surface of the segment, a rubber-based sealing material is attached to the joint surface, and for waterproofing the fastening bolt, bolt packing or caulking is applied.

[0003]

[Problems to be solved by the present invention] The above-mentioned conventional segment connection technology has the following problems. <B> In addition to the high installation cost of the bolt box, the reinforcing bar at the location where the box is installed is damaged, resulting in a weak point in strength.
In addition, there is still anxiety about the water stopping effect at the joints of the segments. <B> The connecting portion of the segment is extremely weak against a bending moment such that the outside of the segment becomes tensile. <C> At present, while the automation of tunnel construction is progressing, bolt fastening work in a narrow bolt box is not suitable for mechanization, and it still relies on manual labor of workers. For this reason, in order to automate tunnel construction, there is a demand for a proposal of a technology capable of automating segment connection work.

[0004]

[Purpose of the present invention] The present invention has been made in view of the above points. The purpose of the present invention is to eliminate the need for a conventional bolt box, to improve the water stoppage of the joint portion, and to improve the marketability of the segment. It is an object of the present invention to provide a sealed segment and a connecting structure of the segments that have improved strength and rigidity. Still another object of the present invention is to provide a shield segment and a segment connection structure suitable for mechanization of a segment connection operation.

[0005]

SUMMARY OF THE INVENTION In the present invention, a curved flat concrete segment is stepped at a constant width on an outer peripheral surface near both ends in the circumferential direction of the segment to form a pair of outward facing shelves. A continuous joint surface is formed from both ends in the circumferential direction of each outward shelf surface, and a plurality of bolt insertion holes are opened through the inner peripheral surface of the segment and the outward shelf surface. Further, in the present invention, in a curved flat concrete segment, the inner peripheral surface near both ends in the circumferential direction of the segment is stepped at a fixed width to form a pair of inward shelves, and the circumference of each inward shelf. A joint surface is formed from both ends in the direction, and a plurality of screw holes are formed facing the inward shelf surface. Also, in the present invention, in a curved flat concrete segment, the inner peripheral surface near one end in the circumferential direction of the segment is stepped at a fixed width to have an inward shelf surface and the outer periphery near the other end in the inner peripheral direction of the segment. An outward shelf surface stepped at a constant width is provided on the surface, a continuous joint surface is formed from each circumferential end of the inward shelf surface, and a plurality of screw holes are opened facing the inward shelf surface. A continuous joint surface is formed from both ends in the circumferential direction of the outward shelf surface, and a plurality of bolt insertion holes are opened through the inner peripheral surface of the segment and the outward shelf surface. The present invention is, respectively in the joint structure of the segment to be bolted against the joint surface of the segments opposite, and stage cut in the middle to form a joint surface respectively corresponding segments facing each s
Forming an outward shelf surface and an inward shelf surface, abutting the segments so that the opposing shelf surfaces and respective joint surfaces are in contact with each other,
Holes and is provided through a segment in the circumferential surface and the outwardly facing ledge surface
A bolt is screwed into a screw hole provided on the inward shelf surface to fasten the two segments.

[0006]

Embodiment 1 The present invention will be described below with reference to the drawings.

<A> Segment FIG. 1 is an overall perspective view of a shield tunnel. The shield tunnel has a plurality of segment rings S1, S2, S
3 ... Each segment ring S1, S2,
S3 ... K segment 1 to be inserted at the end of assembly
0 and two types of flat plate segments 20 and 30 are provided. Each of the segments 10, 20, 30 is composed of reinforced concrete, ductile, a composite of steel and concrete, and the like. When mechanically assembling each of the segments 10, 20, and 30, each segment 1
A hanging hand tool (not shown) is provided inside 0, 20, and 30,
Alternatively, a backing agent injection hole is opened if necessary.

<B> K Segment As shown in FIG. 2, the K segment 10 is formed by cutting the outer peripheral surfaces near both ends in the circumferential direction at a constant width into steps of an outward shelf surface 11 and from both ends of the outward shelf surface 11 respectively. A continuous joint surface 12, 12 is formed. Further, the K segment 10 is provided with a plurality of bolt holes 13 penetrating the segment inner peripheral surface and the outward shelf surface 11. The bolt hole 13 is formed in a direction perpendicular to the outward shelf surface 11.

<C> Flat Plate Segment The flat plate segment 20 is formed by cutting the outer peripheral surface near one end in the circumferential direction and the inner peripheral surface near the other end into a constant width in the same manner as the K segment 10, with the outward shelf surface 21 and the outer shelf surface 21. An inward shelf surface 22 is formed, and at the end of each shelf surface 21, 22, a continuous radial joint surface 23, 23 is formed toward the inner and outer surface of the segment. A plurality of bolt holes 24 are formed between the inner peripheral surface of the segment and the outward shelf surface 21, and a plurality of nuts 25 are embedded in the inward shelf surface 22 at the same intervals as the bolt holes 24. As shown in an enlarged manner in FIG. 3, the nut 25 is connected to a resistance plate 26 integrally or fixed to a reinforcing bar arranged in a segment in order to prevent the nut 25 from coming off. The flat plate segment 30 shown in FIGS. 1 and 2 has a pair of inward shelves 31 by step cutting on the outer peripheral surface near both ends in the circumferential direction.
31 is a segment of the type forming each inward shelves 3
Radiation joint surfaces 32, 32 are formed from the ends of 1, 31 toward the inner and outer surfaces of the segment. A pair of inward shelves 3
A plurality of nuts 33 are embedded in 1 and 31. These segments 10, 20, 30 are angled such that when assembled in a ring shape, the entire surface is continuously in contact between the respective shelf surfaces 11, 21, 22, 31 and between the joint surfaces 12, 23, 32. And area are set. In addition, in order to prevent water from stopping at the joints, rubber sealing members 40 are attached to the respective shelf surfaces 11, 21, 22, 31 and the respective joint surfaces 12, 23, 32.

[0010]

Next, a method of assembling the segment ring will be described.

<A> Assembly of flat plate segment As shown in FIG. 2, the inside 1, the segments 10, 20, 30 of the tail portion of the shield machine (not shown) are carried. The flat plate segment 20 having a pair of inward shelves 31, 31 is installed upward by an unillustrated erector device. Next, FIG.
The flat plate segment 20 is attached to each end of the flat plate segment 30 as shown in FIG. As a result, both segments 20, 3
Joint 0 position of Ryotanamen 2 1, 3 1 and the radiation coupling surfaces 23 and 32 each bolt with the flush contact hole 24 and the nut 33 as shown in FIG. 3 are matched. A bolt 50 is screwed into the nut 33 from the inside of the flat plate segment 20 so that both segments
20 and 30 are connected. Fastening operation of the bolt 50 is different as to fasten the bolt towards substantially parallel to the circumferential surface of the conventional flat segment, the segment in the circumferential surface and Tanamen 21,3
Since the bolt 50 can be screwed into the hole 24 provided through the hole 1 and fastened , the fastening operation of the bolt 50 can be mechanized. Hereinafter, the flat plate segment 20 is similarly assembled.

<B> Assembling the K segment Finally, the K segment 10 is placed between the ends of the flat plate segment 20.
To complete the assembly of the segment ring S.

<C> Characteristics of seam The joint according to the present invention has improved water stopping performance as compared with a conventional bolt box type joint. The reason why the water stoppage is improved is that the joint surface area of the segments is increased, the joint surface is bent, and a large number of seal materials can be installed. In addition, the joint of the present invention has improved bending strength and shear strength in comparison with the conventional joint. That is, the bending moment generally acts on the edge of the segment as a fulcrum. In the present invention, since the arm length from the fulcrum to the mounting position of the connecting bolt is longer than before, the physical strength against the bending moment is improved. Conventionally, regarding the shearing force of the connecting portion, the joining surface of the segments is a plane facing the center of the segment, and the frictional force between these planes and the shear strength of the bolt have been expected. In the present invention, in addition to this, the shelves support the shearing force in the direction of pressing the joint surface of the segments, and the tensile strength of the bolt against the shearing force in the direction separating the joint surface of the segments. Support.

[0014]

[Embodiment 2] In the above embodiment, the K segment 1 has the same width. However, the K segment has a single taper ring or a double taper type having different widths before and after a segment used for construction of a curved portion. It is also possible to apply to. In the case of the present embodiment, in order to use the tapered K segment for assembling the straight line portion of the tunnel, it is necessary to taper the joint of the flat plate segments so as to complement the taper angle of the K segment. is there.

[0015]

[Embodiment 3] In Embodiment 1, each segment 10, 20, 30
Has been described in which the circumferential joining ends of the segment rings are stepped and joined, but the segment rings S1, S2, S3
The joint structure of the first embodiment may be applied to the joint surface between... That is, in this embodiment, each segment 10, 2
By stepping the entire periphery of 0 and 30, not only the assembling work of one segment ring S but also the segment ring S
The connection between them can also be automatically bolted from the inside of the segment.

[0016]

As described above, according to the present invention, a portion to be joined of a segment is cut off, and bolts can be screwed from the inside of the segment in a direction crossing the shelf surface of the segment. The following effects can be obtained. <B> Segment shelf surface from inside the segment ring
Can be bolted in the cross direction of the bolt, so that the bolt fastening operation can be mechanized without relying on the manual operation of the operator as in the related art. <B> Since the contact area of the segments is increased, a high water stopping effect can be expected. <C> The conventional bolt box becomes unnecessary. For this reason, it is possible to avoid the loss of the reinforcing bar arranged in the segment, to design a segment having higher rigidity, and to reduce the manufacturing cost of the segment by the amount of the bolt box. <D> Can be applied to any segment.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a shield tunnel.

FIG. 2 is a cross-sectional view of a segment ring showing an assembled state.

FIG. 3 is an enlarged cross-sectional view of a joint portion of a segment.

Claims (4)

(57) [Scope of request for utility model registration] 1. A plate-shaped Concrete segments curved, a pair of outwardly facing ledge surfaces to stage cut at a constant width on the outer peripheral surface near the both ends in the circumferential direction of the segment, the circumferential direction of each outwardly shelf surface A concrete-based segment, wherein a continuous joint surface is formed from each end of the segment, and a plurality of bolt insertion holes are formed through the inner peripheral surface and the outward shelf surface of the segment. 2. A curved plate-shaped Concrete segments, a pair of inwardly facing ledge surfaces to stage cut in the inner peripheral surface near the both ends in the circumferential direction of the segment at a constant width, the circumference of the inward shelf surface A concrete segment comprising a joint surface which is continuous from both ends in the direction, and a plurality of screw holes are formed facing the inward shelf surface. 3. The curved plate-shaped Concrete segments, the inner direction ledge surface segment with the stage cut at a predetermined width on the inner peripheral surface near the circumferential end of the segment inner circumferential direction of the vicinity of the other end provided an outward ledge surface on the outer peripheral surface and Ri stage switching at a constant width, the joint surface of both ends or we each continuous with the circumferential direction of the inwardly facing ledge surface
Forming, said inward facing shelf surface opened a plurality of threaded holes, the joint surface each continuously from circumferential ends of the outer direction ledge surface
Forming a plurality of bolts through the inside of the segments circumferential surface and outward ledge surface
A concrete segment, characterized by having a through hole . 4. A joint structure for a segment in which joint surfaces of opposing segments are abutted and bolted to each other, wherein the joint surfaces of the opposing segments are stepped into corresponding shapes, respectively, and an outward shelf surface and an inward shelf are provided in the middle, respectively. A surface is formed , the segments are abutted to each other, and the opposing shelves and joint surfaces are brought into contact with each other, and the holes provided through the inner peripheral surface of the segment and the outward shelves and the screw holes provided on the inward shelves A joint structure for a segment, wherein a bolt is screwed together to fasten the two segments.