JPH06235298A - Segment - Google Patents

Abstract

PURPOSE:To manufacture a steel segment having high strength at low cost by forming a frame body by a steel material such as an existing H-type steel, welding a steel plate onto the upper surface, and attachably and detachably providing a strut on the steel material. CONSTITUTION:A frame body 3 is formed by a steel material 2 such as an existing H-type steel, I-type steel, channel steel, or circular steel pipe having a plurality of reinforcements, and a steel plate 4 is welded and mounted onto one surface thereof. Struts 8, 8 are attachably and detachably mounted vertically to the steel material 2. Further, bolt insert holes 3a, 3a are provided on the flange 5b of the steel material 2, so that segments 1 can be mutually bonded through lengthy bolts. Thus, a segment usable for the cover of a large sectional tunnel without using a timbering can be manufactured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a segment used in a shield construction method.

[0002]

2. Description of the Related Art Generally, a segment shown in FIG. 14 is often used as a segment used in a shield construction method. In this segment 20, a steel plate 40 is welded to a flat frame body 30, and reinforcing ribs 50 are formed on the inner surface of the segment plate 20 by welding. Then, the segment 20 is lined on the inner surface of the tunnel while being joined with bolts as the shield machine advances.

[0003]

However, in the above segment, the formation of the frame body, the joining of the frame body and the plate, and the attachment of the reinforcing ribs are all performed by welding, so that it takes time and labor to process. There was a drawback that the processing cost was high. Also, in this segment, the joint of the frame will open due to earth pressure, so increase the thickness of the frame and plate,
Alternatively, it is necessary to increase the strength of the segment by increasing the number of reinforcing ribs, which causes a problem of higher cost. The present invention has been made in view of the above problems, and an object of the present invention is to manufacture a segment that is cheaper and stronger than conventional ones.

[0004]

Means for Solving the Problems The segment of the present invention for achieving the above object consists in that a plate is welded to one surface of a frame body made of steel material having a plurality of reinforcing materials. The reinforcing material is a shaped steel or circular steel pipe, and the columns are detachably attached in the vertical direction of the steel material.

[0005]

[Operation] The frame body is made of ready-made H-shaped steel, I-shaped steel, shaped steel such as groove-shaped steel, or circular steel pipe, and a plate is attached to one surface of the frame to manufacture an inexpensive and strong segment. can do. Further, since the pillar is detachably provided on the steel material, earth pressure can be received by the pillar, so that the pillar can be used for lining a tunnel having a large cross section.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the segment according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a perspective view of a segment 1, which includes a ready-made H-shaped steel material 2 and a frame body 3.
And a steel plate 4 is welded to the outer surface of the steel plate 2. A pillar 8 is detachably erected on the steel material 2 and a bolt insertion hole 3a is formed in the frame body 3. .

The frame 3 includes two end steel materials 5 along the long side of the steel plate 4, an intermediate steel material 6 between the end steel materials 5, and side plates 7 at the end portions of the steel materials. It is composed by. The end steel material 5 is welded to the steel plate 4 with the web 5a parallel to each other, whereby the flange 5b becomes a double reinforcing material, and the reinforcing material has a bolt insertion hole 3a for joining. It is penetrated.

On the other hand, the intermediate steel material 6 is slightly larger than the end steel material 5 and is welded in a state where the web 6a is orthogonal to the steel plate opposite to the end steel material 5 so that the strength of the segment 1 is increased. Grows larger. Then, columns 8 are detachably bolted to the intermediate steel material 6 at arbitrary intervals. The columns 8 support a load when the segment 1 is lined in a large cross section tunnel, and are removed when the segment 1 is transported and assembled at the time of line construction. The intermediate steel material 6 can be welded with the webs 6a parallel to each other as in the case of the end steel material 5.

FIG. 5 shows another embodiment,
This is a segment 1 in which the frame body 3 is entirely made of H-shaped steel. By thus providing the H-shaped steel on both the long side and the short side, the strength of the segment 1 can be further increased.

Further, the steel material 2 is not limited to the H-section steel as described above, but may be formed of I-section steel or groove-section steel. Further, the shape is not limited to the above-mentioned shaped steel, but is also shown in FIG.
And as shown in (2), the rectangular steel pipe 9 and the circular steel pipe 10
It can also be formed by.

Next, a method of constructing an underground structure using this segment 1 will be described with reference to FIGS. 7 to 13. First, as shown in FIG. 7, a rectangular shield machine 1
A plurality of 1 are joined to form a combination machine 12 of a predetermined size.

This shield machine 11 is shown in FIGS.
As shown in FIG. 3, the excavation cutter 13 includes a pair of drum cutters 13a for excavating a face on a rotating drum surface, and a ring cutter 13b between the drum cutters 13a, thereby excavating a tunnel having a rectangular cross section. To do. Therefore, as shown in FIG. 9, the tunnel machine 14 having a rectangular cross section is excavated by the combination machine 12 in which a plurality of shield machines 11 are joined.

Then, the combination machine 12 excavates tunnels 14 as shown in FIG. 10 at appropriate intervals, connects them to construct an outer peripheral tunnel 15, and further excavates an inner peripheral portion thereof. By this, an underground structure is constructed. Further, the nine tunnels 14 of the outer peripheral tunnel 15 can be constructed at a stretch by simultaneously excavating the nine combination excavators 12, but in the present embodiment, they are constructed in the order of.

Then, the segments 1 are sequentially lined on the inner surface of the tunnel excavated by the excavation of the combination excavator 12. These segments 1 are, as shown in FIG.
The long bolts 3b inserted into the bolt insertion holes 3a of the shaped steel flange 5b are joined to each other, and the joining portion is filled with the sealing material 1a.

Further, columns 8 are assembled at appropriate intervals between the intermediate steel members of the segment 1 covered on the ceiling surface and the bottom surface of the tunnel 14. It is assumed that the column 8 is detached from the segment when the segment 1 is transported and is assembled when the segment is lined.

The junction of these tunnels 14 is shown in FIG.
As shown in FIG. 3, while excavating the gap portion 18 while hanging the mountain stopper steel plate 17 on the upper surface between the tunnels 14,
A PC steel wire 19 is laid between the tunnels 14, and the PC steel wire 19 is placed in the gap portion 18 for the concrete 1.
After 6 has been cast, tension is fixed and the joint is made.
This allows the shaped steels to be joined to each other to increase the tension, so that the yield strength of the joined portion can be improved.

After the outer peripheral tunnel 15 is constructed, the inner peripheral portion 15a of the outer peripheral tunnel 15 is excavated to construct an underground structure as shown in FIG.
Therefore, these outer peripheral tunnels 15 are used for railways, roads, and other common grooves, and the inner peripheral portion 15a is used for underground parking lots, underground malls, and the like.

[0018]

EFFECTS OF THE INVENTION By making a segment by welding a plate to one surface of a frame body made of a shaped steel such as H-shaped steel or a steel pipe and detachably attaching a pillar to the shaped steel or the like, the strength of existing materials can be improved. Can be manufactured at a large size and at low cost, and can be used for lining a large-section tunnel without using a supporting structure.

Since the width of one ring can be increased by making the steel material into a rectangular cross section, the shield excavation distance can be extended once and an extra cross section is not excavated.

Since the segments are joined through the plurality of reinforcing members, a relatively uniform tightening force can be introduced to the joining surface, and the water stopping performance can be improved.

The use of round steel pipe fills the joints between the segments with backfill material, thus improving the watertightness of the completed tunnel.

A steel material having a circular cross section has a larger section modulus than that of a flat plate and is excellent in load-carrying performance and is less likely to be deformed.

When the secondary winding concrete is carried out, the secondary injection can be carried out by utilizing the steel material having the circular cross section, which is effective for filling the voids.

[Brief description of drawings]

FIG. 1 is a perspective view of a segment.

FIG. 2 is a plan view of a segment.

FIG. 3 is a side view of a segment.

FIG. 4 is a sectional view of a segment.

FIG. 5 is a plan view showing another embodiment of the segment.

FIG. 6 (1) and (2) are cross-sectional views of a segment showing another embodiment.

FIG. 7 is a front view of the shield machine.

FIG. 8 is a sectional view of a shield machine.

FIG. 9 is a front view of a combined shield machine which is a combination of shield machines.

FIG. 10 is a cross-sectional view of an outer peripheral tunnel.

FIG. 11 is a cross-sectional view showing a joined state of segments.

FIG. 12 is an enlarged sectional view of a tunnel.

FIG. 13 is a cross-sectional view showing a joined state of a gap portion of each tunnel.

FIG. 14 is a perspective view of a conventional segment.

[Explanation of symbols]

 1 Segment 2 Steel Material 3 Frame 3a Bolt Insertion Hole 4 Steel Plate 5 End Steel Material 6 Middle Steel Material 7 Side Plate 8 Strut

Claims (2)

[Claims] 1. A segment characterized in that a plate is welded to one surface of a frame made of steel having a plurality of reinforcing members, and a column is detachably attached in a vertical direction of the steel. 2. The segment, wherein the reinforcing material is a shaped steel or a steel pipe.