JP3253263B2 - Steel 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 steel segment, and more particularly, to a steel segment capable of easily removing a vertical rib for transmitting thrust and a skin plate from a steel frame for connecting single tunnels. Things.

[0002]

2. Description of the Related Art In recent years, as a new construction method for constructing a tunnel having a large cross-sectional area, a tunnel shell is excavated in advance by a plurality of single shield machines, and then, the excavated single tunnels are interconnected. In addition, there is a construction in which a tunnel shell body is constructed, and earth and sand in the tunnel shell body are excavated to construct a tunnel having a large cross-sectional area.

Hereinafter, this tunnel construction method will be described in detail with reference to the drawings. FIG. 6 is a front view showing a connecting steel segment for a single tunnel, and FIGS. 7 to 11 are process diagrams showing a tunnel building method using the segments of FIG. 6, and FIG. 7 is a cross-section showing a single tunnel building process. Figure,
FIG. 8 is a cross-sectional view showing a connecting process between the single tunnels, and FIG.
FIG. 1 is a cross-sectional view showing a construction process of a tunnel outer shell body, and FIG.
0 is a cross-sectional view showing a process of excavating earth and sand in a tunnel shell body, and FIG. 11 is a cross-sectional view showing a final process.

[0004] First, after the shaft is constructed, as shown in FIG.
A single shield machine is excavated to construct a plurality of single tunnels 1 constituting an outer shell portion serving as a tunnel body. As shown in FIG. 6, each single tunnel 1 is constructed by a connected steel segment 3 formed by connecting a plurality of steel segments 2 in a rectangular tube shape. Inside the connecting steel segment 3, a middle pillar 4 for reinforcement is stretched. The steel segment 2 is formed by fixing a skin plate to a steel frame composed of a main girder and a joint plate, similarly to a conventional steel segment described later. The steel segments 2 other than the corner portions are all formed in a flat plate shape. In addition, 2
A is the last key segment to be constructed.

Next, after the construction of the adjacent single tunnel 1 is completed, as shown in FIG. 8, the unexcavated portion (S) of the unexcavated portion (S) left between the adjacent single tunnels 1 is excavated. Then, the connecting portion 5 is constructed by arranging reinforcing bars and placing concrete in this excavated portion.

Next, after the connecting portion 5 is constructed in this manner, concrete is poured into each connected steel segment 3 to construct a tunnel shell 6 as shown in FIG.

Next, after the tunnel outer shell body 6 is constructed in this way, as shown in FIG. 10, earth and sand 7 in the tunnel outer shell body 6 are excavated by an ordinary excavator. Then, after excavating the earth and sand 7 in the tunnel outer shell body 6 in this way, the inner members 8 such as the inner wall, the intermediate floor slab, and the partition wall are constructed in the tunnel outer shell body 6. Thus, a tunnel with a large cross section is constructed.

[0008]

In the tunnel construction method described above, the unexcavated portion (S) remaining between the single tunnels 1 is excavated, and the excavated portion is provided with reinforcement and concrete placement. In order to construct the connection part 5, it is necessary to remove the vertical rib and the skin plate fixed to the steel segment 2 corresponding to the unexcavated part (S) from the steel frame.

However, the conventional steel segment 9 shown in FIG. 12 has a skin plate 11 and a plurality of vertical ribs 10.
Are fixed to the steel frame 14 composed of the main girder 12 and the joint plate 13 by welding, so that the vertical ribs 10 and the skin plate 11 are made of steel unless melted by a torch or cut by a cutter. It cannot be separated from the frame 14.

Therefore, the vertical rib 10 and the skin plate 1
Removal of 1 requires a great deal of time and effort. For this reason, it has been desired to develop a steel segment capable of easily removing the vertical rib and the skin plate from the steel frame, but such a segment has not yet been proposed.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a steel segment from which a vertical rib for transmitting thrust and a skin plate can be easily removed from a steel frame.

[0012]

The invention according to claim 1 is a steel frame having a pair of parallel main girders and a pair of parallel joint plates assembled at right angles to each other, and one of the steel frames. A skin plate detachably attached to a surface of the joint plate , and a plurality of thrust transmitting members for detachably attaching a jack thrust, the joint plate being detachably attached between the main girders,
Between them, an intermediate girder is fixed in parallel with the main girder, and the thrust
The transmission member has two vertical ribs, and the two vertical ribs have an opening degree.
It has a connecting bracket for connecting
And the thrust transmitting member includes one of the main girder and the intermediate girder.
And between the other of the main girder and the intermediate girder,
Attached facing each other across the intermediate girder,
The closed end of the thrust transmitting member is in contact with the main girder,
The open end of the thrust transmitting member is characterized by being in contact with the intermediate girder .

[0013] The invention according to claim 2 is the thrust transmitting unit.
The material has a support plate for supporting the skin plate
It is characterized by being fixed .

According to a third aspect of the present invention, the connection fitting is provided.
Is a connecting screw inserted between one ends of the two vertical ribs.
And a nut screwed into the connection screw with the vertical rib interposed therebetween
Those having a particular characteristic consisting of.

[0015] The invention according to claim 4 , wherein the skin plate includes a holding plate abutting on the steel frame and the lower surface of the skin plate, a bolt penetrating the skin plate and the holding plate, and the bolt And a nut that is screwed into the steel frame so as to be detachably attached to the steel frame.

[0016]

Next, an embodiment of a steel segment according to the present invention will be described with reference to the drawings.

FIG. 1 is a plan view showing the steel segment of the present invention, FIG. 2 is a rear view showing the steel segment of the present invention, FIG. 3 is a front view showing the steel segment of the present invention,
4 is a sectional view taken along line AA of FIG. 3, and FIG. 5 is a partially enlarged view of FIG.

1 to 4, reference numeral 15 denotes a steel frame. The steel frame 15 is formed by assembling a pair of parallel main girders 16 having joint bolt holes 16A and a pair of parallel joint plates 17 having joint bolt holes 17A at right angles.
And an intermediate girder 18 fixed in parallel with the main girder 16 between central portions of the girder.

Reference numeral 19 denotes a skin plate which is detachably attached to one surface of the steel frame 15 by a fastener 20 (see FIG. 5). The skin plate 19 is divided into two parts by the middle girder 18. The stopper 20 includes a holding plate 21 that is in contact with the lower surfaces of the steel frame 15 and the skin plate 18, a bolt 22 that penetrates the skin plate 19 and the holding plate 21, and a nut 23 that is screwed to the bolt 22. ing.

According to the fastener 20 configured as described above, the skin plate 18 is placed on the steel frame 15, the holding plate 21 is put on the steel frame 15, and the bolt 22 is tightened. 18 can be fixed to the steel frame 15. On the other hand, if the holding plate 21 is removed from the bolt 22 by turning the nut 23, the skin plate 18 can be removed from the steel frame 15.

Reference numeral 24 denotes a plurality of thrust transmitting members for transmitting the jack thrust to the downstream segment. The thrust transmitting member 24 includes two vertical ribs 25 and two vertical ribs 2.
And a connection fitting 26 for connecting the reference numerals 5 in a C-shape. The connection fitting 26 includes a connection screw 27 inserted between one ends of the two vertical ribs 25 and a nut 28 screwed to the connection screw 27 with the vertical rib 25 interposed therebetween. The opening of the two vertical ribs 25 can be freely adjusted by adjusting the position of the nut 28.

The thrust transmitting member 24 has the intermediate girder 18 sandwiched between one (A) of the main girder 16 and the intermediate girder 18 and between the other (B) of the main girder 16 and the intermediate girder 18. They are mounted facing each other. Thrust transmission member 24
Is in contact with the main girder 16, and the open end of the thrust transmitting member 24 is in contact with the intermediate girder 18.

The thrust transmitting member 2 configured as described above
According to No. 4, by shortening the distance between the nuts 28 of the connecting fitting 26 and reducing the opening of the two vertical ribs 25,
Since the two vertical ribs 25 bite between the main girder 16 and the intermediate girder 18, the thrust transmitting member 24 can be firmly fixed to the steel frame 15. On the other hand, by increasing the distance between the nuts 28 of the connection fitting 26 and increasing the opening of the two vertical ribs 25, the two vertical ribs 25
Therefore, the thrust transmitting member 24 can be removed from the steel frame 15.

When a reaction force from a shield machine (excavator) is applied to the thrust transmitting member 24 during tunnel excavation, a force for expanding the two vertical ribs 25 acts on the thrust transmitting member 24. The spread of the vertical ribs 25 is prevented.

Reference numeral 29 denotes an L-shaped support plate fixed to each of the vertical ribs 25. The L-shaped support plate is mounted on and supports the skin plate 18 so as not to deform the skin plate 18. Reference numeral 30 denotes a ridge for positioning the thrust transmitting member 24 fixed to the inner surface of the main girder 16.

The thrust transmitting member 24 is not limited to the above-described structure as long as it has sufficient strength and can be easily attached to and detached from the steel frame 15. The steel segment described above is the key segment 2A in the connected steel segment shown in FIG. 6, but is the same as the other segment.

According to the steel segment of the present invention configured as described above, as shown in FIG. 8, in the step of connecting between the single tunnels, the nut 23 of the stopper 20 is turned and the pressing plate 21 is turned. Can be easily removed from the inside of the steel frame 15 by extracting from the bolt 22. Also, the nut 2 of the connection fitting 26
By turning 8 to widen the opening of the two vertical ribs 25, the thrust transmitting member 24 can be easily removed from the inside of the steel frame 15. Therefore, it is possible to easily excavate the unexcavated portion of the earth and sand left between the single tunnels, and to arrange the connecting portion by arranging reinforcement and placing concrete in the excavated portion.

[0028]

As described above, according to the present invention, there is provided a useful effect that the vertical ribs for transmitting thrust and the skin plate can be easily removed from the steel frame.

[Brief description of the drawings]

FIG. 1 is a plan view showing a steel segment of the present invention.

FIG. 2 is a rear view showing the steel segment of the present invention.

FIG. 3 is a front view showing a steel segment of the present invention.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a partially enlarged view of FIG. 4;

FIG. 6 is a front view showing a connecting steel segment for a single tunnel.

FIG. 7 is a cross-sectional view showing a construction process of a single tunnel.

FIG. 8 is a cross-sectional view showing a connecting step between the single tunnels.

FIG. 9 is a cross-sectional view illustrating a step of constructing a tunnel outer shell body.

FIG. 10 is a cross-sectional view showing a process of excavating earth and sand in a tunnel shell body.

FIG. 11 is a sectional view showing a final step.

FIG. 12 is a perspective view showing a conventional steel segment.

[Explanation of symbols]

 1: Single tunnel 2: Steel segment 3: Connecting segment 4: Middle pillar 5: Connection part 6: Tunnel shell body 7: Earth and sand 8: Internal member 9: Conventional steel segment 10: Vertical rib 11: Skin plate 12 : Main girder 13: Joint plate 14: Steel frame 15: Steel frame 16: Main girder 16A: Joint bolt hole 17: Joint plate 17A: Joint bolt hole 18: Intermediate girder 19: Skin plate 20: Clamp 21: Holder Plate 22: Bolt 23: Nut 24: Thrust transmission member 25: Vertical rib 26: Connection fitting 27: Connection screw 28: Nut 29: Support plate 30: Positioning ridge

──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Yukinobu Sasaki 4-51 Otacho, Naka-ku, Yokohama-shi, Kanagawa Prefecture, Kashima Construction Co., Ltd.Yokohama Branch Inside Light Steel Co., Ltd. (72) Inventor Toshinori Ueno 6100 Sankejiri, Kumagaya-shi, Saitama Japan Steel Pipe Light Steel Co., Ltd. (56) References JP-A-9-268896 (JP, A) JP-A-2-136499 ( JP, A) Hikaru Hira 1-147098 (JP, U) Jiko 45-64432 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) E21D 11/15 E21D 11/04

Claims (4)

(57) [Claims] 1. A steel frame having a pair of parallel main girders and a pair of joint plates parallel to each other, and a skin plate removably attached to one surface of the steel frame. A plurality of thrust transmitting members for transmitting jack thrust, which are detachably attached between the main girders,
An intermediate girder is fixed between the joint plates in parallel with the main girder.
The thrust transmitting member includes two vertical ribs and the two
Connection for connecting vertical ribs in a C-shape with adjustable opening
And the thrust transmitting member is one of the main girders.
And the intermediate girder, and the other of the main girder and the intermediate girder
With the girder, facing each other with the intermediate girder in between.
And the closed end of the thrust transmitting member abuts on the main girder.
And the open end of the thrust transmitting member abuts on the intermediate girder.
A steel segment characterized by being made. Wherein the thrust transmission member, and a supporting plate for supporting the skin plate is fixed, the steel segment according to claim 1, wherein. 3. The connection fitting comprises a connection screw inserted between one ends of the two vertical ribs, and a nut screwed into the connection screw with the vertical rib interposed therebetween. The steel segment according to claim 1 . 4. The skin plate includes: a holding plate abutting on the steel frame and the lower surface of the skin plate; a bolt penetrating the skin plate and the holding plate; and a nut screwed to the bolt. The steel segment according to any one of claims 1 to 3 , wherein the steel segment is detachably attached to the steel frame by a metal stopper.