JP3162348B2 - Steel segment and shield tunnel excavation method for tunnel lining - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shielded tunnel excavation method, and more particularly to a shielded excavation method suitable for excavating a small-diameter tunnel, and a steel segment for tunnel lining used in the method.

[0002]

2. Description of the Related Art Conventionally, in constructing a pipeline system such as a sewer, if the pipeline has a small diameter, it is economical to bury a pipe body in a trench cut out from the ground. In the case of large-diameter pipelines, the amount of excavation of earth and sand increases, which greatly affects the traffic on the ground. .

[0003] By the way, the ground in an urban area or the like where the construction of such a pipeline network is necessary is often insufficient in strength, and a large-diameter pipeline serving as a trunk line is constructed by a shield tunnel excavation method. Was normal. However, the shield tunnel excavation method has a problem that when the diameter of the tunnel is 2 m or less, the workability of lining in a narrow tunnel is reduced, and the excavation speed is limited.

[0004]

SUMMARY OF THE INVENTION According to the present invention, when constructing a small-diameter tunnel having a diameter of 2 m or less, the tunnel can be efficiently constructed without limiting the excavation speed. It is an object of the present invention to provide a new shield tunnel excavation method, and to provide a new steel segment for tunnel lining used for carrying out such a shield tunnel excavation method.

[0005]

According to the present invention, a steel segment for tunnel lining is provided on an inner surface of a cylindrical body formed of a steel plate.
A plurality of beam members parallel to the axis are provided rotationally symmetric with respect to the axis and at substantially equal intervals, and an annular reinforcing member formed of an arcuate rib member orthogonal to the beam member is provided along the inner periphery of the cylindrical body. It is characterized by having.

Further, the shield tunnel excavation method using the steel segment for tunnel lining according to the present invention comprises:
In performing excavation and lining of a tunnel in the ground using a shielded excavator, a substantially rectangular steel plate is wound and rolled in an excavator rear space formed by propelling the shielded excavator. A plurality of beam members parallel to the longitudinal direction are introduced into the inner surface of the split tubular steel plate at a substantially equal interval including a position of the opposite end of the cut . An expansion device is introduced into the inner space, the outer diameter of the segment member is made to match the outer diameter of the tunnel lining body, and the opposite ends of the split are joined to form a cylinder. An annular reinforcing member formed by assembling a plurality of arc-shaped rib members along a circumference is provided to form a steel segment according to claim 1, and the steel segment is connected to an adjacent existing segment, and then the shield type excavator is provided. To promote drilling , Followed by those characterized by repeating the series of steps described above.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The shield tunnel excavation method of the present invention will be described below in detail with reference to the drawings. Figure 1
FIG. 4 shows the state of the tunnel during the execution of the shield tunnel excavation method of the present invention. Reference numeral 3 denotes a shield tunnel excavator that excavates the tunnel 2 in the ground 1.
Reference numeral 1 denotes an excavation unit provided with an excavator, a jack 32, and the like.
A segment assembling section 34 is connected to the rear of the excavating section 31 via a flexible connecting section 33, so that the excavating direction can be corrected.

Reference numeral 4 denotes a steel segment of the present invention, which is a unit constituting a lining portion of the wall surface of the tunnel 2. The steel segment 4 includes a cylindrical body 41 made of a steel plate and having a substantially circular cross section. A plurality of beam members 4 which are rotationally symmetrical with respect to the axis and are provided at substantially equal intervals on the inner surface of the cylindrical body 41 are parallel to the axis.
2 and an arc-shaped rib material 4 orthogonal to the beam material 42.
3a and 43b, and a plurality of annular reinforcing members 43 provided along the inner periphery of the cylindrical body 41.

Such a steel segment 4 is provided in the rear space of the tunnel excavator 3, particularly in the space centered on the segment assembling section 34, with the segment member 4 a and the arc-shaped rib material 43.
a and 43b. As shown in FIG. 5, the segment member 4a used here is provided with a plurality of beam members 42 on the inner surface of a cut tubular steel plate 40 obtained by winding a substantially rectangular steel plate by, for example, welding or bolting.
Are provided in parallel at substantially equal intervals. The opposite ends of the slits to be joined when shaping into a cylindrical shape and the opening end positions and intermediate positions where the arc-shaped rib members 43a, 43b... Are to be attached are respectively provided with fastening members 4c such as bolts. Mounting holes 40a, and if necessary, concrete injection holes 40b for ready-mixed concrete filling the gap between the steel segment 4 and the ground 1 may be provided.

Such a segment member 4a is prepared in a factory according to the shape of the tunnel to be installed, and is carried to the assembly site. The segment member 4a carried into the segment assembling section 34 is shown in FIG. An expansion device such as the hydraulic press 5 is introduced into the center of the segment member 4a, and the plurality of telescopic arms 51 are extended uniformly. Then since the segment member 4a is shaped into a cylindrical shape to expand, as shown in FIG. 7, of the opposing ends of the cut-split
The other opposing end is outside the beam material 42 attached to the side
Since they overlap with each other , the sealing member 4b is sandwiched between the two opposing ends , and connected with a fastening member 4c such as a bolt to form the cylindrical body 41b.
Is obtained.

As shown in FIG. 8, a cylindrical body 41 having a plurality of beam members 42 fixed to the inner surface is obtained. Here, the hydraulic press 5 is removed from the cylindrical body 41. Subsequently, a plurality of annular reinforcing members 43 are provided on the inner side surface of the cylindrical body 41 along the inner circumference so as to be orthogonal to the beam member 42 by using a fastening member 4c such as a bolt. As the annular reinforcing member 43, an annular rib member 43a for reinforcing the opening end of the cylindrical body 41 as shown in FIG. 9 and a central portion of the cylindrical body 41 as shown in FIG. Can be cited as an example, but the present invention is not limited to this.

As described above, the steel segment 4 assembled by fixing the beam member 42 and the annular reinforcing member 43 to the inner surface of the cylindrical body 41 is press-bonded to the existing steel segment 4 using the jack 32. The annular reinforcing members 43 attached to the respective open end portions are brought into close contact with each other with the sealing member 4d interposed therebetween, and then connected by using a fastening member 4c such as a bolt as shown in FIG. The assembly and installation of the steel segment 4 are completed.

Thereafter, if necessary, a track for carrying out the excavated earth and sand and carrying in materials is extended into the newly constructed steel segment 4, and excavation of the ground in front of the tunnel excavator 3 and earth and sand are performed. And the like, and the tunnel excavator 3 is propelled using the jack 32, the auxiliary beam 35, and the like. After the steel segment 4 has been dug by about one length in this manner, the internal space of the excavation part 31, the flexible connection part 33, and the segment assembly part 34 of the tunnel excavator 3 is cleaned, and The segment member 4a is carried in, the assembly of the steel segment 4 is repeated in the same manner as described above, and the construction of the tunnel is advanced.

After the segment assembly 34 of the tunnel excavator 3 is separated from the position of the steel segment 4 thus installed, if necessary, the steel is inserted through a concrete injection hole 40b provided in the steel segment 4. By injecting ready-mixed concrete into the gap between the steel segment 4 and the ground 1 or installing a formwork or the like inside the steel segment 4 to fill the space between the steel segment 4 and the formwork with ready-mixed concrete. Thus, a tunnel having a tough lining can be completed.

[0015]

According to the shield tunnel excavation method of the present invention, a segment member or an arc-shaped rib material manufactured at a factory using a steel plate is carried into the tunnel, and the steel segment assembled on site is used for the tunnel. Because the lining is used, the lining work can be performed very efficiently even in a narrow space in a small-diameter tunnel. The ratio of the required time can be greatly reduced, which has the effect of shortening the construction period and reducing the construction cost.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a tunnel near a shield-type excavator before a steel segment for tunnel lining is installed in a shield-type tunnel excavation method of the present invention.

FIG. 2 is a cross-sectional view of a tunnel near a shield type excavator when a segment member for tunnel lining is carried in the shield type tunnel excavation method of the present invention.

FIG. 3 is a cross-sectional view of a tunnel near a shield-type excavator when a segment member is elongated and shaped into a cylindrical body in a shield-type tunnel excavation method of the present invention.

FIG. 4 is a diagram showing a state in which a steel segment for tunnel lining is completed in the shield tunnel excavation method of the present invention.
It is sectional drawing of the tunnel near a shield type excavator.

FIG. 5 is an external perspective view of a segment member which is a material for assembling the steel segment for tunnel lining according to the present invention.

FIG. 6 is an external perspective view of a hydraulic press for extending a segment member that is a material for assembling the steel segment for tunnel lining according to the present invention.

FIG. 7 is an external perspective view of a cylindrical body obtained by shaping a segment member, which is a material for assembling a steel segment for a tunnel lining according to the present invention, in which a joining portion is enlarged.

FIG. 8 is a partial external perspective view of a cylindrical body obtained by shaping a segment member which is a material for assembling a steel segment for tunnel lining according to the present invention.

9 is an external perspective view of an arcuate rib material used for assembling the steel segment for tunnel lining according to the present invention, which is used for an annular reinforcing member for an opening of a cylindrical body, and FIG. (B) is a diagram showing the outside. It is an external appearance perspective view of a segment member.

FIG. 10 is an external perspective view of an arcuate rib material used for assembling the steel segment for tunnel lining according to the present invention, which is used for an annular reinforcing member for a central position of a cylindrical body.

FIG. 11 is a partial external perspective view showing a part of a structure in which adjacent ones of the steel segments for tunnel lining of the present invention are connected to each other.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ground 2 Tunnel 3 Tunnel excavator 31 Excavation part 32 Jack 33 Flexible connection part 34 Segment assembling part 35 Auxiliary beam 4 Steel segment 4a Segment member 4b Seal member 4c Fastening member 4d Seal member 40 Split tubular steel plate 40a Mounting hole 40b Concrete injection hole 41 Cylindrical body 42 Beam material 43 Annular reinforcing member 43a Arc-shaped rib material 43b Arc-shaped rib material 5 Hydraulic press 51 Telescopic arm

Claims (7)

(57) [Claims] 1. A plurality of beam members parallel to an axis are provided on the inner side surface of a cylindrical body formed of a steel plate at rotationally symmetrical and substantially equal intervals with respect to the axis, and are constituted by arcuate rib members orthogonal to the beam members. A steel segment for tunnel lining, characterized in that said annular reinforcing member is provided along the inner periphery of said tubular body. 2. The steel segment for tunnel lining according to claim 1, wherein a plurality of the annular reinforcing members are sequentially provided along a length of the cylindrical body. 3. The tunnel lining according to claim 1, wherein the annular reinforcing member is provided at an open end of the cylindrical body.
Steel segment of. 4. When excavating and lining a tunnel in the ground using a shield type excavator, a substantially rectangular steel plate is formed in a rear space of the excavator formed by propelling the shield type excavator. A plurality of beam members parallel to the length direction on the inner surface of the cylindrical steel plate
The segment members provided at substantially equal intervals including the end position are introduced, and then the expansion device is introduced into the inner space of the segment member so that the outer diameter of the segment member matches the outer diameter of the tunnel lining body. claim together by combining the opposite ends of said cut-split shaped into the cylindrical body, further provided with an annular reinforcing member made by assembling a plurality of arcuate ribs material along the inner periphery of the tubular member
Forming a steel segment according to 1 above, joining the steel segment with an adjacent existing segment, and then propelling the shield type excavator to perform excavation, and subsequently repeating the above series of steps. The shield tunnel excavation method. 5. The shield tunnel excavation method according to claim 4, wherein opposing ends of the segment members are connected via a seal member. 6. The steel segment is connected to an adjacent existing segment via a sealing member.
Shield tunnel excavation method described in 1. 7. The shield tunnel excavation method according to claim 4, wherein the steel segment and the reinforced concrete cast on the inner surface thereof form an integrated lining body.