JP3967233B2 - Shield starter for branch line shield machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shield starter for a branch line shield machine suitable for constructing a branch tunnel that branches from a main tunnel.
[0002]
[Prior art]
In recent years, there have been an increasing number of cases of constructing a branch tunnel that branches from a main tunnel at a substantially right angle.
[0003]
A branch tunnel is constructed by arranging and setting a branch line shield machine at a branch position of the main tunnel constructed by the main line shield machine and excavating from the arrangement set position.
[0004]
For the branch line shield machine, a machine built-in type arranged in the main line shield machine and a segment built-in type built in the segment are known.
[0005]
[Problems to be solved by the invention]
The former machine built-in type that constructs a branch tunnel can be divided into an underground stem branch shield method and a right angle branch shield method.
[0006]
The outline of the structure of the main line shield machine used for the rhizome branch shield method is divided into three parts: front trunk, middle trunk, rear trunk, and tail. The middle torso has an outer and inner double skin plate structure. At the start of the branch line shield machine, it is a means to move only the outer skin plate to expose the start hole, and the length of the machine becomes longer than that of a normal main line shield machine by having a middle trunk. Have a problem.
[0007]
Further, the branch line shield machine used in the right angle branch shield method is, for example, a swivel bearing for turning, a cutter drive motor for driving a cutter disk, a shield jack for shield machine drilling, and the like with a main line shield machine. Therefore, there are problems such as the simultaneous construction of the main tunnel and the branch tunnel is not possible, and the branch tunnel work is restricted.
[0008]
On the other hand, in the latter type with a built-in segment, when assembling the branch line shield machine, the rear tail part of the main line shield machine has a double structure, leaving the outer tail frame at the branch position. Assemble the segments with cutters that make up the shield machine. Then, excavate the main shield shield machine to the extent that does not affect the start of the branch shield shield machine, and when the segment with the cutter appears on the ground, assemble the front trunk, then the rear trunk Become. Therefore, it takes time for assembly work, and for example, when assembling the shield machine in the horizontal direction, the work direction is horizontal, so that an unreasonable work posture is forced during assembly work, It was not desirable in terms of workability.
[0009]
Therefore, the present invention enables the construction of a branch tunnel from any part of 360 degrees with respect to a reliable seal property and a main line tunnel, and is also excellent in assembly and workability. The object is to provide a starting device.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, according to claim 1 of the present invention, a special segment for starting that is provided at a branching position of a main tunnel constituted by segments and that can be excavated is closely attached to the inside of the segment of the main tunnel. A cylindrical lining steel that is fixed and has an opening in a partial area of the special segment, and a rotating sleeve that is rotatably supported inside the lining steel and is provided with a starting well that faces the opening of the lining steel when rotating, A first seal member that seals between the lining steel and the rotating sleeve in a ring shape on both sides of the special segment area for starting, and a branch line shield provided at the starting well and assembled to the starting well A second seal member that elastically contacts the outer peripheral surface of the trunk of the excavator in a ring shape, and the rotating sleeve at a predetermined position. And a rotating sleeve drive means for rotating the said first, second sealing member is characterized that it is an expansion seal adjoining strong seal surface and bullets that expand from the reduced state.
[0011]
As a result, the rotating sleeve can be smoothly rotated, for example, by 360 degrees by the rotating sleeve driving means. For example, the axis of the excavator and the axis of the start-off port can be obtained by setting the direction of the starting well downward. alignment is facilitated, while being positioned in the correct position relative to the starting wellhead, Ru can be done easily assembling work without being forced to unnatural posture.
[0012]
On the other hand, if the rotary sleeve with the branch line shield machine installed at the start pit is rotated by a predetermined angle and then locked, the branch line shield machine is set at an appropriate position of 360 degrees with respect to the main tunnel. It becomes possible.
[0013]
In addition, the special segment is excavated when the branch line shield machine is started. At this time, the start well and the branch line shield are formed between the lining steel and the rotating sleeve on both sides by the first seal member. The gap between the peripheral body of the excavator is reliably sealed by the second sealing member, and the intrusion of muddy water or the like from the natural ground is reliably prevented .
[0015]
In addition, since a high sealing pressure is secured by strongly elastic contact with the sealing surface, it is possible to easily cope with the construction of a deep branch tunnel.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be specifically described with reference to FIGS. 1 to 11.
[0017]
FIG. 1 shows a schematic cutaway view of a shield starter 3 of a branch line shield propulsion device 1 according to the present invention.
[0018]
The shield starter 3 is arranged and set at a branch position of the main tunnel 5 constructed by a main shield excavator (not shown). As shown in FIG. 11, the main tunnel 5 is composed of segments 7, The segment at the branching position is a special segment 9 for starting that can be excavated. In the region of the special segment 9 for starting, a tubular lining steel 11 is assembled.
[0019]
The lining steel 11 has a shape in which the region of the special segment 9 is opened, and is closely fixed to the inner peripheral surface of the segment 7 constituting the main tunnel 5.
[0020]
In this case, it is preferable that the lining steel 11 is carried in a state of being divided into two parts from a shaft not shown in the figure and assembled into a cylindrical shape by fixing means such as welding at a branch position.
[0021]
A rotating sleeve 13 is assembled inside the lining steel 11, and the above-described branch line shield machine 1 is assembled to the start shaft 15 of the rotating sleeve 13.
[0022]
The rotary sleeve 13 is formed in a cylindrical shape when completed, but is divided into three parts, a first, a second, and a third divided sleeve 13a, 13b, and 13c, from the shaft not shown in the figure to the branch position. Is done. The first divided rotary sleeve 13a is provided with a start shaft 15, and in the vertical shaft (not shown), the start shaft 15 of the first divided sleeve 13a has a carriage (with a direction facing downward as shown in FIG. (Not shown). A front body portion 19 having a cutter disk 17 of the branch line shield machine 1 is assembled at the front end of the start shaft 15, and a drive motor 21 for driving the cutter disk 17 and a cutter disk 17 are provided in the front body portion 19. A stirrer 25 that stirs the inside of the cutter chamber 23 made behind, a drainage / feeder mud discharger 27, and the like are assembled, and in this state, they are conveyed and set at a branching position.
[0023]
The second and third divided rotary sleeves 13b and 13c are carried in after the branch position loading of the first divided rotary sleeve 13a is completed, and are formed in a cylindrical shape by fixing means such as welding at the branch position. .
[0024]
Both sides of the rotating sleeve 13 assembled in a cylindrical shape are rotatably supported with respect to the inner peripheral surface of the lining steel 11 by supporting means 29 such as guide rollers arranged at a predetermined interval.
[0025]
As shown in FIG. 11, the rotating sleeve 13 has mounting brackets 31 on both sides, and can be rotated 360 degrees by the rotating sleeve driving means 33. After completion of the rotation, the fixing pin 35 is fixed and locked at a predetermined rotational position.
[0026]
The rotary sleeve drive means 33 is a hydraulic jack type composed of a piston 37 and a cylinder 39, and the piston 37 is detachably attached to each attachment portion 41 of the support bracket 31.
[0027]
The cylinder 39 is attached to the segment 7 constituting the main line tunnel 5, and by extending the piston 37, a rotation amount corresponding to the extension stroke can be obtained.
[0028]
Therefore, by repeating the operation of removing the piston 37 at the rotation completion position where the rotation sleeve 13 has been rotated by a predetermined amount, reattaching the piston 37 to the attachment portion 41 of the support bracket 31 in a contracted state, and extending the piston 37, 360 degrees. It can be rotated.
[0029]
After the setting of the rotation angle of the rotation sleeve 13 is completed, the fixing pin 35 is formed with a lock hole that reaches from the inside of the rotation sleeve 13 to the lining steel 11 and the segment 7, and the fixing pin 35 is inserted into the lock hole, whereby the rotation sleeve 13 fixed lock states can be obtained.
[0030]
On the other hand, between the lining steel 11 and the rotating sleeve 13 at the peripheral edge portions on both sides of the special segment 9 for starting, a ring-shaped first seal member 43 for cutting face mud water pressure is also used for starting. Between the wellhead 15 and the outer peripheral surface 1a of the trunk portion of the branch line shield machine 1 is sealed by a ring-shaped second seal member 45 for starting and blocking.
[0031]
As shown in FIGS. 2 and 3, the first and second seal members 43 and 45 are made of rubber (natural or synthetic resin) in which nylon or polyester reinforcing fibers 47 are knitted in the center, and are in the form of strips. It is made into a shape, and both side portions have a shape in which a ring-shaped presser fitting 51 is provided via a reinforcing hard rubber 49. In this case, the left and right presser fittings 51 are fixedly supported on the outer peripheral surface of the rotating sleeve 13 by bolts 53 and nuts 55, for example, so that the doughnut-shaped cross section is disposed along the outer peripheral wall surface of the rotating sleeve 13. The first seal member 43 is also fixedly supported on the rim flange portion of the start pit 15 so that the doughnut-shaped second seal member having a bag-shaped cross section disposed along the rim of the start pit 15 is provided. 45 are configured.
[0032]
Therefore, as shown in FIG. 3, the first and second seal members 43 and 45 are in a reduced standby state (FIG. 3) when air or water is fed into the internal space from the supply pipe 57 by a supply device (not shown). 3 chain line) and the lining steel 11 (in the case of the 1st seal member 43) used as a seal surface, or the trunk | drum outer peripheral surface 1a (in the case of the 2nd seal member 45) of the branch line shield machine 1 are each elastically contacted strongly. The expansion seal can be switched to the expanded expanded seal operation state (solid line in FIG. 3).
[0033]
Next, the operation | movement which starts the branch line shield machine 1 from the shield starting apparatus 3 used as a branch position is demonstrated.
[0034]
First, as shown in FIG. 6, for example, an erector apparatus (not shown) for assembling a segment in the front body portion 19 in which the main drive motor 21, the stirring device 25, and the mud discharge device 27 are assembled. Assemble other auxiliary parts.
[0035]
At the time of assembling work at this branch position, the axis line x of the branch line shield machine 1 is in the vertical direction, so that it is easy to align the axis of the start well 15 with the correct position relative to the start hole 15. Assembling work can be easily performed in a positioned state without being forced into an unreasonable working posture .
[0036]
Next, the rotating sleeve 13 is rotated in the branch direction by the rotating sleeve driving means 33, and after the rotation angle setting is completed, the rotating sleeve 13 is fixedly locked by the fixing pin 35. Thereby, the branch line shield machine 1 is positioned toward the desired branch direction (FIG. 7).
[0037]
In this state, the first and second seal members 43 and 45 are expanded to secure the seals on both sides of the special segment 9 and the peripheral edge of the start pit 15.
[0038]
Next, after the folding jack 59 is assembled as shown in FIG. 7, the branch line shield machine 1 is started a little, and the tail front part 61 and the shield jack 63 are assembled as shown in FIG. At this time, the special segment 9 is excavated and opened, but a reliable sealing state is secured by the first seal member 43.
[0039]
Next, as shown in FIG. 9, after the branch line shield machine 1 is dug with the shield jack 63, the tail rear part 61 is assembled.
[0040]
Next, as shown in FIG. 10, the branch tunnel 67 is constructed by excavating the segment 65 while assembling it with an erector device (not shown).
[0041]
【The invention's effect】
As described above, according to the present invention , the branch line shield machine can be easily positioned at a desired branch position 360 degrees smoothly by the combination of the lining steel and the rotating sleeve. Also, when working at the branch position, by making the axis of the branch line shield machine up and down, alignment with the axis of the start well is easy, and in a state where it is positioned at the correct position with respect to the start well, In addition , the assembling work can be easily performed without being forced into an unreasonable working posture .
[0042]
The first, high sealing pressure that adjoining strongly bullets and second if Re sealing member is expanded sealing surface is possible to cope even with deep branch line boring to be ensured.
[Brief description of the drawings]
FIG. 1 is a schematic cut explanatory view of a shield starting device of a branch line shield machine according to the present invention.
FIG. 2 is a schematic explanatory view on one side of a seal member.
FIG. 3 is a schematic explanatory diagram of an operating state of a seal member.
FIG. 4 is a schematic cut explanatory view of a branch position of a main tunnel.
FIG. 5 is a schematic cut explanatory view of a branch position in which a branch line shield machine is assembled at the start pit of the first split rotary sleeve.
FIG. 6 is a schematic cut explanatory view in which a second rotary sleeve and a third split sleeve are assembled to the first split rotary sleeve at the branch position to form a cylindrical rotary sleeve.
FIG. 7 is a schematic cutting explanatory view in which a rotary sleeve assembled with a branch line shield machine is rotated 90 degrees.
FIG. 8 is a schematic cut explanatory diagram in which the branch line shield machine is slightly started.
FIG. 9 is a schematic cut explanatory view showing the assembled state of the tail rear part by further starting the branch line shield shield machine.
FIG. 10 is a schematic cutting explanatory diagram during excavation while assembling segments.
11 is a schematic sectional view taken along line AA in FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Branch line shield machine 5 Main line tunnel 7 Segment 9 Special segment 11 Lining steel 13 Rotating sleeve 15 Starting pit 33 Rotating sleeve drive means 43 1st seal member 45 2nd seal member

Claims (1)

A special segment for starting that can be excavated provided at a branch position of the main tunnel constituted by the segment, and a cylindrical lining steel that is closely fixed inside the segment of the main tunnel and in which a part of the special segment is opened, A rotating sleeve that is rotatably supported inside the lining steel and has a starting well that faces the opening of the lining steel when rotating, and the lining steel and the rotating sleeve on both sides of the special segment area for starting A first seal member that seals between the two in a ring shape, and a second seal member that is elastically contacted in a ring shape with the outer peripheral surface of the trunk portion of the branch line shield machine that is provided at the start pit and is assembled to the start pit When, and a rotary sleeve drive means for rotating said rotary sleeve to a predetermined position, the first, 2 the sealing member, the branch line shield machine shield starting device, characterized in that has an expansion seal adjoining strong seal surface and bullets that expand from the reduced state.

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