JPH0826751B2 - Concrete segment - 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 used for constructing a shield tunnel or the like.

[0002]

2. Description of the Related Art Conventionally, a concrete segment of this type uses a so-called rebar cage, which is composed of a large-diameter main rebar and a small-diameter rebar, as a reinforcing aggregate disposed inside. Is common.

[0003]

However, in the conventional reinforced basket in the concrete segment, it is very troublesome to assemble a large number of rebars constituting the basket, and a large number of rebars are combined. Therefore, it cannot be said that the rigidity is high, and the reinforcing effect on the concrete segment is not always sufficiently exerted.

Also, the fixing of the joint fitting for connecting the concrete segments to the above-mentioned rebar cage is not strong because it is carried out through the anchor bars and the like, and the concrete segments cannot be firmly connected.

As described above, the conventional concrete segment has problems that the production work is complicated and expensive, and the strength of the segment itself and the connection strength between the segments are not sufficient.

The present invention was conceived in view of the above-mentioned circumstances, and the purpose thereof is concrete which can be easily manufactured and can be manufactured at low cost, and which can sufficiently secure the strength of the segment itself and the connection. To provide segments.

[0007]

In the concrete segment of the present invention, two main steel frames, in which flat steel beams arranged at intervals in parallel with each other in the vertical direction are fixed at both ends of a plurality of lattice members, are juxtaposed in close proximity. The two ends of the reinforcing steel frame assembly are connected in parallel with each other by band-shaped plates, and a plurality of reinforcing steel assemblies are integrally arranged in parallel by welding the fittings with holes for inserting the connection bolts inside the band-shaped plate. It is characterized by being buried in concrete.

Then, the concrete segment can be easily and inexpensively manufactured by a simple operation of setting the ready-made high-rigidity main steel frame which is the steel frame assembly with the joint fitting. Also, by strengthening with a strong high-rigidity main steel frame constructed by assembling two main steel frames with a band-shaped plate, the strength of the concrete segment is made sufficient and a joint that became a part of the high-rigidity main steel frame. Use metal fittings to firmly connect concrete segments together.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The concrete segment of the present invention will be described below with reference to the illustrated embodiments.

A concrete segment 1 (see FIGS. 1 and 2) has two main steel frames 2 and 2 arranged in parallel at a close position in parallel with each other, and both main steel frames 2 and 2 at both longitudinal ends.
By the strip-shaped plate 10 provided so as to connect the main steel frames 2 and 2 and the joint fitting 3 connected to the strip-shaped plate 10, the two main steel frames 2 and 2 are integrated for reinforcement. A plurality of steel frame assemblies 4 are arranged in parallel as reinforcing aggregates inside.

In the reinforcing steel frame assembly 4 of this embodiment, long flat steel beams 5 and 5 are connected by a plurality of lattice members 6 to form a substantially I-shaped cross section. Steel frames 2 and 2,
A strip plate 10 connecting the longitudinal ends of the two main steel frames 2 and 2.
And a joint fitting 5 connected to the strip plate 10 and integrated with both main steel frames 2 and 2. The joint fitting 5 may be connected to the inside of the strip plate 10 and may be connected to both main steel frames 2 and 2. Each of these steel materials is connected by welding. The strip plate 10 connects the two main steel frames 2 and 2 to each other to assemble the steel frame assembly 4 which is a high-rigidity main steel frame and reinforce the concrete around the joint fitting 5. The reference numeral 7 in FIG. 2 is a sheath tube for connection. In addition,
Reference numeral 9 is a block out for inserting a connecting bolt.

3 and 4 show another embodiment of the reinforcing steel frame assembly 4 in the concrete segment 1 of the present invention.

In the reinforcing steel frame assembly 4, the upper and lower flanges of I-shaped steel correspond to the flat steel beams 5 and 5, and the web of I-shaped steel having a plurality of through holes 8 in the longitudinal direction has a plurality of lattices. The I-type steel beam corresponds to the main steel frame 2. This I-shaped steel beam is made into a pair, and both ends thereof are connected and integrated by the strip plate 10 and the joint fitting 5.

If such a steel frame assembly 4 is manufactured in advance by welding, a plurality of the steel frame assemblies 4 can be set in parallel in a mold (not shown) to have sufficient strength. The concrete segment 1 secured in the above can be easily manufactured.

Moreover, since the joint fitting 3 is attached as a part of the reinforcing steel frame assembly 4, the concrete segments 1 can be reliably and firmly connected to each other.

[0016]

In the concrete segment according to the present invention, a steel frame assembly in which both ends of a pair of main steel frames are connected by strip-shaped plates and joint fittings 5 are integrally attached to both ends is used as a reinforcing aggregate internally. It is manufactured by arranging a plurality of pieces.

Therefore, the concrete segment can be easily and inexpensively manufactured by only setting the prefabricated steel frame assembly inside the mold. Also,
The strength of the concrete segment can be sufficiently secured by the steel frame assembly in which the two main steel frames are integrated. Further, since the joint fitting is a part of the reinforcing aggregate, the concrete segments can be firmly connected to each other.

[Brief description of drawings]

FIG. 1 is a schematic partial perspective view showing a concrete segment of the present invention.

FIG. 2 is an enlarged perspective view of an end portion of FIG.

FIG. 3 is a schematic partial perspective view showing another embodiment of the high-rigidity main steel frame in the concrete segment of the present invention.

4 is an enlarged perspective view of an end portion of FIG.

[Explanation of symbols]

1 ... Concrete segment, 2 ... Main steel frame, 3 ...
Joint fittings, 4 ... Steel frame assembly, 5 ... Flat steel beam, 6 ... Lattice material, 7 ... Sheath tube, 8 ... Through hole, 9 ... Blockout, 10 ... Strip plate.

Claims (1)

[Claims] 1. A pair of main steel frames, in which flat steel beams arranged at intervals in parallel with each other in the vertical direction are fixed at both ends of a plurality of lattice members, are juxtaposed at adjacent positions, and both ends thereof are connected by strip-shaped plates. Inside the strip-shaped plate, a plurality of reinforcing steel frame assemblies, which are integrated by welding joint fittings having holes for inserting connection bolts, are arranged in parallel and embedded in concrete. Concrete segment to be used.