JP4079816B2 - Tunnel construction method and shield machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tunnel construction method and a shield machine, and more particularly to a tunnel construction method in which a main tunnel and a widening tunnel are constructed and joined in parallel, and a shield machine.
[0002]
[Prior art]
In a road tunnel, it is necessary to provide an emergency parking zone for a vehicle every predetermined distance. This emergency parking zone forms a parking space on the side of the main road, and is formed in a widening tunnel constructed along a part of the longitudinal direction of the tunnel.
[0003]
Conventionally, when constructing a widening tunnel along a part of the longitudinal direction of the tunnel, first the main tunnel that forms the main road is excavated and constructed by a shield machine, and then the main tunnel is constructed by a shield excavator for widening. A widening tunnel was constructed by excavating radially outward. For example, Patent Document 1 discloses such a widening excavator. However, since this method requires two steps to construct a tunnel, there are disadvantages that the cost is high and the construction period is prolonged.
[0004]
[Patent Document 1]
Japanese Examined Patent Publication No. 62-1073
[Problems to be solved by the invention]
Accordingly, as shown in FIG. 6, the present inventor newly developed a shield tunneling machine 52 capable of constructing the main tunnel 50 and the widening tunnel 51 in parallel, and the main tunnel 50 constructed using the shield tunneling machine 52 and the widening tunnel. A technique for joining the tunnel 51 is under development.
[0006]
In this tunnel construction method, it is necessary to construct the main tunnel 50 and the widening tunnel 51 close to each other, but the widening tunnel 51 is assembled at a position spaced forward from the main tunnel 50, so Depending on the conditions, there is a problem that the widening tunnel 51 may move in the soil before reaching the assembly position of the main tunnel 50 and be separated from the main tunnel 50. When the widening tunnel 51 is joined to the main tunnel 50, it is necessary to fix the widening tunnel 51 to the main tunnel 50 and ensure water stoppage between the tunnels 50 and 51. However, a technique for performing such work has been established. There was a problem that not.
[0007]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems, and to construct a main tunnel and a widening tunnel close to each other, fix the widening tunnel to the main tunnel, and secure a water stop between the tunnels and a shield. It is to provide an excavator.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention excavates a main tunnel hole with a cutter in front of a shield machine, and stretches a segment on the inner wall of the main tunnel hole at the rear part of the shield frame of the shield machine to form the main tunnel. constructs, are projected a widening cutter radially outward from the peripheral surface of the shield frame during excavation of the shield machine, excavating expansion width tunnel hole on the side of the main gallery bore at its widened cutter, from the shield frame The widening shield frame protrudes into the widening tunnel hole, and then the main tunnel hole is drilled with the main cutter while the widening tunnel hole is drilled along the main tunnel hole with the widening cutter, and the widening segment is assembled within the widening shield frame. assemble the segments within the rear of the shield frame with constructing the widened tunnel building a main tunnel, thereafter, the Width tunnel drawn to the main tunnel is obtained so as to connect to each other.
[0009]
Then, the foreign matter interposed between the widening tunnel and the main tunnel may be sucked and removed into the main tunnel, and the widening tunnel is attracted to the main tunnel by earth pressure applied to the outside of the widening tunnel.
[0010]
Further, after the widening tunnels attracted to the main tunnel, it may be such that consolidated them in quotation volts.
[0011]
The widening tunnel is constructed in a cylindrical shape having a substantially arc-shaped cross section along the outer periphery of the main tunnel, and has elastic sealing members at both ends of the portion joined to the main tunnel, and between the sealing members The foreign matter between the inner surface of the widening tunnel and the outer surface of the main tunnel is sucked into the main tunnel and earth pressure is applied to the outer periphery of the widening tunnel to attract the widening tunnel to the main tunnel, and then the inner peripheral side of the widening tunnel and the main tunnel It is good to conclude with a quotation bolt .
[0012]
A shield body having a main cutter at a front portion in the excavation direction and having a main segment assembly portion for extending a segment in a main tunnel hole excavated at a rear portion in the excavation direction; and the main cutter and the main segment assembly portion, A widening cutter provided on the side of the shield main body between the main tunnel hole so as to be able to protrude and retract outward in the radial direction, and a rear side of the widening cutter provided on the rear side of the widening cutter. A widening segment assembly section for assembling a widening segment in a widening tunnel hole excavated by the widening cutter, and an outer wall of the shield body connecting the widening segment assembly section and the main segment assembly section. And a guide means for guiding the widened segment to the main tunnel side.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[0014]
As shown in FIG. 1, the shield machine 1 has a main cutter 2 at the front part in the excavation direction and extends a segment 4 constituting the main tunnel 33 in the main tunnel hole 3 excavated at the rear part in the excavation direction. A shield body 6 having a main segment assembly portion 5 and a widened tunnel hole along a side portion of the main tunnel hole 3 provided in a side portion of the shield body 6 so as to be able to protrude and retract radially outward and excavated by the main cutter 2. A widening cutter 8 for excavating 7, and a widening segment assembly 10 for assembling the widening segment 9 in the widening tunnel hole 7 provided behind the widening cutter 8 and excavated by the widening cutter 8. ing.
[0015]
The main cutter 2 is rotatably provided on the bulkhead 11 of the shield body 6, and includes a plurality of spokes 12 extending radially outward from the center of rotation and a number of cutter bits provided on each of the spokes 12. 13 and a copy cutter 14 provided at the outer end of the spoke 12 so as to be able to protrude and retract radially outward. The bulkhead 11 is provided with a cutter driving motor 15 for rotationally driving the main cutter 2.
[0016]
The main segment assembly portion 5 is provided with an erector (not shown).
[0017]
The shield body 6 has a shield frame 16 which is formed in a circular cross section and forms an outer shell.
[0018]
The widening cutter 8 is provided at a position between the main cutter 2 and the main segment assembly portion 5 and is housed in a guide portion 17 formed in the shield body 6 so as to be radially slidable in a radially slidable manner. The slide portion 18, a swing body 20 having a spherical sealing surface 19 provided so as to be swingable about the vertical axis on the slide portion 18, and a cutter body 21 provided rotatably on the swing body 20. Between the slide part 18 and the shield body 6, a cylinder 22 is provided as an actuator for sliding the slide part 18 in the radial direction. In addition, a cylinder 23 serving as an actuator for swinging the swinging body 20 around the vertical axis is provided between the slide unit 18 and the swinging body 20.
[0019]
The widened segment assembly portion 10 includes a widened shield frame 24 that is provided in the shield body 6 so as to be able to project and retract radially outward, and for securing a space for assembling the widened segment 9 on the radially outer side of the shield body 6.
[0020]
The widened shield frame 24 is disposed between the widened cutter 8 and the main segment assembly portion 5, and includes a front end wall portion 25 that defines a front end when projecting radially outward from the shield body 6, and a front end wall And a peripheral wall portion 26 extending rearward from the outer edge of the portion 25. The widening shield frame 24 has an open work space facing rearward in the excavation direction and projects into the widening tunnel hole 7 excavated by the widening cutter 8.
[0021]
Further, a sealing member (not shown) is provided between the widened shield frame 24 and the shield frame 16 so that water does not enter the machine from between the frames 24 and 16. The widened shield frame 24 is provided with a jack 27 for pressing the assembled widened segment 9 backward. The rear end portion of the widened shield frame 24 is connected with the widened segment 9 and the widened shield frame 24. A tail seal 28 for stopping water is provided.
[0022]
In the widened shield frame 24, a widened segment assembly device 29 for assembling the widened segment 9 is provided.
[0023]
As shown in FIGS. 1 and 2, the wide segment assembling device 29 includes a guide rail 30 provided in the wide shield frame 24 so as to extend in the machine width direction, and a running portion 31 provided on the guide rail 30 so as to be able to run. And a grip portion 32 that is provided on the traveling portion 31 so as to be movable back and forth and grips the widened segment 9 in a freely detachable manner.
[0024]
As shown in FIG. 3A, the widened segment 9 is formed in a closed loop shape, and is a cylinder that has a substantially arc-shaped cross section along the outer peripheral portion of the main tunnel 33 by being overlapped and connected in the excavation direction. A body-shaped widening tunnel 34 is constructed. The widened segment 9 has a fitting portion 35 formed in a shape along the outer peripheral shape of the shield body 6 and the main tunnel 33.
[0025]
The fitting portion 35 is formed in an arc shape having substantially the same curvature as the shield body 6 and the main tunnel 33, and has a guided portion 37 engaged with a guide means 36 described later on the outer periphery. The guided portion 37 includes a guide groove 38 extending along the axis, and accommodates the guide means 36 so as to be slidable back and forth. A plurality of guide grooves 38 are formed in the fitting portion 35 so as to be spaced apart in the circumferential direction, and are engaged with the guide means 36 at a plurality of locations separated in the circumferential direction.
[0026]
Further, a bolt hole (not shown) for inserting a reference bolt (not shown) is formed in the fitting portion 35 so as to extend in the radial direction, and is a pressure-bonded and joined to the main tunnel 33 for elasticity. A member 39 is provided. Specifically, the seal member 39 is provided at the upper end edge and the lower end edge of the fitting portion 35 so as to extend from the front end to the rear end of the fitting portion 35 and project toward the main tunnel 33 side. ing.
[0027]
The shield body 6 has guide means 36 for guiding the assembled widened segment 9 to the main tunnel 33 side along the outer wall of the shield main body 6 connecting the widened segment assembly portion 10 and the main segment assembly portion 5. Is provided.
[0028]
Specifically, the guide means 36 is configured by providing the shield frame 16 with a protrusion 40 protruding radially outward. The protrusions 40 are formed in a shape that fits in the guide grooves 38 of the widened segment 9, and are provided in multiple upper and lower stages so as to fit in the respective guide grooves 38 that are separated in the circumferential direction.
[0029]
As shown in FIG. 3B, the protrusions 40 are formed to have substantially the same dimensions in the front-rear direction and the circumferential direction so as not to affect the control in the excavation direction when only the main tunnel 33 is constructed. A plurality of them are arranged along the axis.
[0030]
Next, the tunnel construction method is described.
[0031]
When the widening tunnel 34 is constructed along the main tunnel 33, the widening cutter 8 that is completely accommodated in the shield body 6 is gradually driven while the shield tunneling machine 1 is excavated and the main tunnel 33 is constructed. And projecting outward in the radial direction to tilt the excavation surface of the widening cutter 8 forward. Then, the widening shield frame 24 is gradually protruded radially outward according to the protruding amount of the widening cutter 8. The main tunnel 33 is constructed by stretching the segment 4 on the inner wall of the main tunnel hole 3 excavated by the main cutter 2.
[0032]
When the widening cutter 8 and the widening shield frame 24 protrude by a predetermined amount, the widening segment 9 starts to be stretched on the inner wall of the widening tunnel hole 7 excavated by the widening cutter 8.
[0033]
In the extending operation of the widening segment 9, first, the lid member 41 for closing the rear end of the widening tunnel 34 is pushed backward by the jack 27, and the widening segment assembly device 29 assembles the widening segment 9 on the front side of the lid member 41. And the operation | work which assembles the new widening segment 9 on the front side of the existing widening segment 9 according to the amount of excavation of the shield main body 6 is repeated sequentially.
[0034]
When the widened segment 9 goes outside the widened shield frame 24, the projection 40 provided on the shield frame 16 enters the guide groove 38 of the widened segment 9, and the widened segment 9 extends along the shield main body 6 and behind the shield main body 6. Guide to slide to For this reason, the widening tunnel 34 can be accurately constructed at a position along the main tunnel 33.
[0035]
Then, when the shield machine 1 is dug and passes by the side of the widening tunnel 34 formed by assembling the widening segment 9, the widening tunnel 34 is brought close to the main tunnel 33 constructed behind the shield machine 1.
[0036]
When the widening tunnel 34 and the main tunnel 33 are brought close to each other in a predetermined positional relationship in this way, as shown in FIG. 4, foreign matter interposed between the tunnels 33, 34 from the grout hole 42 formed in the main tunnel 33. (Muddy water or residual soil) 43 is sucked toward the main tunnel 33 to draw the widening tunnel 34 toward the main tunnel 33. When the sealing member 39 of the widening tunnel 34 comes into contact with the main tunnel 33, a negative pressure is generated between the tunnels 33 and 34, and the sealing member 39 is pressed against the main tunnel 33 by the surrounding earth pressure.
[0037]
Thereafter, as shown in FIG. 5, the reference bolt 46 is inserted into the bolt hole 44 formed in the widened segment 9 and the bolt hole 45 formed in the segment 4 to engage the main tunnel 33 and the widened tunnel 34. The widening tunnel 34 is further pulled and fixed to the main tunnel 33 by fastening the quotation bolt 46.
[0038]
Then, the widening tunnel 34 is connected to the main tunnel 33 in order from the rear side while the front widening segment 9 is sequentially fixed to the main tunnel 33 in the same procedure.
[0039]
The tunnels 33 and 34 are connected to each other by opening a portion where the main tunnel 33 and the widening tunnel 34 overlap between the upper and lower sealing members 39 and joining the main tunnel 33 and the widening tunnel 34 by welding or the like.
[0040]
In this way, the main tunnel 33 is constructed by stretching the segment 4 on the inner wall of the main tunnel hole 3 excavated by the shield machine 1, and the widening cutter 8 protrudes radially outward from the side of the shield machine 1. Then, the widened tunnel hole 7 is excavated along the side of the main tunnel hole 3, the widened segment 9 is stretched on the inner wall of the excavated widened tunnel hole 7, and the widened tunnel 34 is constructed. Since the main tunnel 33 is attracted to the main tunnel 33 and connected to each other, the widening tunnel 34 can be fixed to the main tunnel 33, and water stoppage between the tunnels 33 and 34 can be secured.
[0041]
Further, since the foreign matter 43 interposed between the widening tunnel 34 and the main tunnel 33 is sucked toward the main tunnel 33 and the widening tunnel 34 is drawn to the main tunnel 33, the widening tunnel 34 can be easily drawn to the main tunnel 33. it can.
[0042]
Since the widening tunnel 34 and the main tunnel 33 are engaged with the reference bolt 46 and the reference bolt 46 is fastened, the widening tunnel 34 is drawn and connected to the main tunnel 33, so that the main tunnel 33 is easily and reliably connected. The widening tunnel 34 can be fixed to the main tunnel 33 at an accurate position.
[0043]
In addition, the widening tunnel 34 is constructed in a cylindrical shape having a substantially arc-shaped cross section along the outer peripheral portion of the main tunnel 33, and is provided with a sealing member 39 having elasticity at a portion joined to the main tunnel 33. The water stop can be easily ensured by pulling and adhering to the main tunnel 33.
[0044]
The shield is provided with guide means 36 provided along the outer wall of the shield body 6 connecting the widened segment assembly portion 10 and the main segment assembly portion 5, and for guiding the assembled widened segment 9 to the main tunnel 33 side. Since the digging machine 1 is configured, the main tunnel 33 and the widening tunnel 34 can be constructed close to each other.
[0045]
The seal members 39 are provided at both upper and lower ends of the fitting portion 35. However, the present invention is not limited to this, and a seal member (not shown) extending along the mesh along the fitting portion 35 may be provided. Good. In this case, the segment 4 may be provided with a grout hole 42 for each area surrounded by the seal member. Even if a part of the widened segment 9 is cut open, a negative pressure state can be maintained in other areas that are not cut open, and the widened tunnel 34 can be pressed against the main tunnel 33.
[0046]
Further, the guide groove 38 is provided in the widened segment 9, and the projection 40 is provided as the guide means 36 in the shield body 6. Conversely, the protrusion 40 is provided in the widened segment, and the guide groove 38 is provided as the guide means in the shield body. May be.
[0047]
The grout hole 42 is formed in the main tunnel 33 and the foreign matter 43 interposed between the tunnels 33 and 34 is sucked to the main tunnel 33 side. However, the grout hole 42 is formed in the widening tunnel 34 and the foreign matter 43 is removed. It is good also as what is attracted | sucked to the widening tunnel 34 side.
[0048]
【The invention's effect】
In short, according to the present invention, the following excellent effects can be obtained.
(1) The main tunnel and the widening tunnel can be constructed close to each other.
(2) A widening tunnel can be fixed to the main tunnel, and water can be secured between the tunnels.
[Brief description of the drawings]
FIG. 1 is a plan sectional view of a shield machine showing a preferred embodiment of the present invention.
2 is a cross-sectional view taken along line II-II in FIG.
3A is a front sectional view of the guiding means, and FIG. 3B is a side view of the guiding means.
FIG. 4 is an explanatory front view of a state in which foreign matter interposed between the widening tunnel and the main tunnel is sucked to the main tunnel side.
FIG. 5 is an explanatory front view of a state in which the widening tunnel and the main tunnel are drawn together with a reference bolt.
FIG. 6 is a schematic explanatory diagram of a shield machine under development.
[Explanation of symbols]
1 Shield machine 2 Main cutter 3 Main tunnel hole 4 Segment 5 Main segment assembly 6 Shield body 7 Wide tunnel hole 8 Wide cutter 9 Wide segment (segment)
DESCRIPTION OF SYMBOLS 10 Widening segment assembly part 33 Main tunnel 34 Widening tunnel 36 Guide means 39 Seal member 43 Foreign material 46 Quote bolt

Claims (5)

The main tunnel hole is excavated with the cutter in front of the shield machine, and the main tunnel is constructed by stretching a segment on the inner wall of the main tunnel hole at the rear of the shield frame of the shield machine, while the shield machine is in progress circumferential surface radially outward of the shield frame is projected to widening cutter, the at widening cutter drilling expansion width tunnel hole on the side of the main tunnel hole, is protruded a widened shielding frame from the shield frame widening tunnel hole, Thereafter, the main tunnel hole is excavated with the main cutter, the widened tunnel hole is excavated along the main tunnel hole with the widened cutter, the widened segment is assembled in the widened shield frame, and the rear shield frame is constructed. assembling segments to build the main tunnel in the inner, attract Thereafter, the widening tunnel main tunnel Tunnel construction method of being characterized in that so as to connect to each other. Claim, characterized in that draw foreign matter interposed between the widening tunnel and main tunnels is removed by suction in the main tunnel, a widening tunnel earth pressure acting on the outside of the widened tunnel main tunnel 1 The tunnel construction method described. It said after the widening tunnels attracted to the main tunnel, the tunnel construction method of these claims 1 or 2, wherein was set to be consolidated in quotation volts. The widening tunnel is constructed in a cylindrical shape having a substantially arc-shaped cross section along the outer periphery of the main tunnel, and has elastic sealing members at both ends of a portion joined to the main tunnel, and the widening tunnel between the sealing members The foreign matter between the inner surface and the outer surface of the main tunnel is sucked into the main tunnel and earth pressure is applied to the outer periphery of the widening tunnel to draw the widening tunnel into the main tunnel, and then the inner peripheral side of the widening tunnel and the main tunnel are cited. 4. The tunnel construction method according to claim 3 , wherein the tunnel is fastened with bolts .   A shield body having a main cutter at the front portion in the excavation direction and having a main segment assembly portion for extending a segment in the main tunnel hole excavated at the rear portion in the excavation direction; and between the main cutter and the main segment assembly portion A widening cutter provided on the side of the shield body so as to be able to protrude and retract radially outward from the main body, and a widening cutter for excavating the widening tunnel hole along the side of the main tunneling hole, and the widening cutter provided behind the widening cutter. The widened segment assembly section for assembling to widen the widened segment in the widened tunnel hole excavated by, and the shield body outer wall connecting the widened segment assembly section and the main segment assembly section, and assembled. A shield machine having guide means for guiding the widened segment to the main tunnel side.

Images