JP3286798B2 - Widening construction method of shield machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for widening a shield excavator used for enlarging a tunnel section by a shield excavator having a widening function.

[0002]

2. Description of the Related Art The shield method has been used in road tunnels typified by the Tokyo Bay Crossing Road due to the progress of closed shield technology, the enlargement of the section, the increase in depth, and the development of the compound section method. Is planned as a reality.

However, when a road tunnel is constructed by a shield method, a method of partially enlarging the tunnel cross section is required to solve the problem that an emergency parking zone must be installed. In reality, the technology cannot sufficiently cope with a partial enlargement of the tunnel cross section.

[0004] For this reason, as shown in FIG. 2, the left and right main shields 4, which are rotatably mounted on the front part of the shield frame 3, are attached to the left and right main cutters 1 and the center sub-cutter 2. The shield frame 3 is divided into a side shield frame body 3a and a central shield frame body 3b at upper and lower portions parallel to the axis of the main cutter 1; There has been proposed a multiple shield excavator 6 that is superposed so as to be able to slide a predetermined amount in the left-right direction.

[0005] With such a multiple shield excavator 6,
When constructing a road tunnel, while the shield frame 3 is reduced in width, the main cutters 1 of the left and right main shield parts 4 are used to excavate the upper and lower (up and down) main road sections,
A general part can be constructed by excavating the connecting part of the upper and lower road main lines with the sub-cutter 2 of the central sub-shield part 5, while a copy cutter protruding from the outer peripheral part of the main cutter 1 ( (Not shown), the side of the face is dug out to secure the widened space of the shield frame 3, and then the main shield 4 is moved away from the sub-shield 5 by the widened jack (not shown). By excavating the shield frame 3 with the shield frame 3 widened, the tunnel cross section can be enlarged.

[0006]

However, in the case of the shield machine 6 described above, the fact is that a smooth widening construction technique has not been established. That is, the shield machine 6
When constructing a road tunnel using, as described above,
In order to widen the shield frame 3, it is necessary to dug the side of the face with a copy cutter to secure the widening space. However, in order to install an emergency parking zone, it is about 2.5m to the tunnel main line. Since the widening amount of is required,
It is difficult to dug this width at a time with a copy cutter. Also, even if the tunnel can be dug at once, a problem arises in how to connect the main tunnel portion and the widened portion.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method for widening a shield excavator that can be dug without difficulty by a copy cutter and that segments can be duly connected without difficulty.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a shield excavation in which a shield frame is divided into a central shield frame body and left and right side shield frame bodies so as to be able to widen in the left-right direction. In the widening construction method of the shield machine where the widening part is constructed in the middle of the tunnel main part using a machine, in advance, at the position before the widening part, to connect the tunnel main part and the widening part Plan a sloping part that gradually expands from the main part of the tunnel to the widened part and forms a slanting direction as a whole.When the front end of the shield machine reaches the slid part, the tunnel main part is Excavation setting amount obtained by dividing the amount of widening to the widening part by the unit amount equivalent to the width of the tunnel lining segment and dividing by the length of the rubbing part , Excavating only the unit amount while excavating the side face of the face, and then further increasing the amount of extra digging by the copy cutter by the above-mentioned extra digging amount and digging the unit amount again. This process was repeatedly performed until entering the rubbing portion, and then the shield frame was maintained in the parallel state of the left and right side shield frame bodies by the set amount of the excavation until the front end of the shield machine reached the widening portion. The widening process of widening as it is and the extra digging process per unit amount of digging while digging with a copy cutter are alternately performed, and then the entire length of the shield digging machine enters the widening portion through the slicing part. Until then, the above-mentioned shield frame widening process, and with this widening, the amount of extra digging by the copy cutter is reduced by the set amount of extra digging, and The excavation process is performed alternately, and when the entire length of the shield excavator has passed the rubbing portion, the above-mentioned excavation is completed, and the widening portion is formed by performing the excavation while maintaining the widening state of the shield frame constant. The method shall be a widening construction method for shield machine that is characterized by construction.

[0009]

[Function] The shield frame is gradually widened so that the shield frame is kept parallel to the left and right side shield frames each time the unit is excavated by a unit amount while excavating so as to follow the planned oblique rubbing portion. Therefore, a large amount of widening can be obtained without difficulty. In addition, since the unit amount of excavation corresponds to the width of the segment, it is possible to sequentially assemble segments having a larger diameter, and it is possible to smoothly connect between the main tunnel portion and the widened portion.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. A shield excavator 6 having the same structure as that shown in FIG. 2 is used to form a widened portion 8 on one side of a tunnel main line 7. The following shows the case where

In order to connect the main tunnel portion 7 and the widening portion 8 to a position before the expected position of the widening portion 8, the tunnel gradually expands from the main tunnel portion 7 to the widening portion 8, and as a whole an oblique direction. Plan the rubbing part 9 to be formed in
Excessive digging to be increased each time a unit amount (distance) corresponding to the width of the tunnel lining segment 10 is excavated based on the amount of widening from the main tunnel portion 7 to the widening portion 8 and the length of the sloping portion 9. Try to find the set amount. First, as shown by the solid line, when the front end of the shield machine 6 reaches the rubbing portion 9, the above calculation is performed from the outer peripheral portion of the main cutter 1 (see FIG. 2) located on the side where the widening portion 8 is to be constructed. The copy cutter is protruded by the set amount of extra digging, and the copy cutter is dug by the unit amount corresponding to the width of the tunnel lining segment 10 while digging the side surface of the face by the extra digging amount. To do. Next, the amount of extra excavation by the copy cutter is further increased by the set amount of extra excavation so that the shield excavator 6 is excavated by a unit amount again, and this process is repeated a required number of times, as indicated by a thick two-dot chain line. The entire length of the shield machine 6 is made to enter the rubbing portion 9. Here, the extra digging amount that is increased each time the unit is excavated is d, the width of the widening from the main tunnel portion 7 to the widening portion 8, the length of the slicing portion 9, the width of the segment 10 (= unit Assuming that (amount) is w, it can be obtained as (d × w) / l. By the way,
Assuming that d is 2.5 m, l is 60 m, and w is 1 m, 0.0
42 m.

As described above, when the shield machine 6 enters the rubbing portion 9, as shown by a thin two-dot chain line, the shield frame 3 is divided into left and right side shield frame bodies 3a (FIG. 2).
After the width is increased by the set amount of the above-mentioned excavation while maintaining the parallel state of (Ref.), The unit is excavated by the unit amount while excavating with the same amount of the above-mentioned excavation in the state. By alternately repeating such a widening process and an extra excavation process per unit amount, the shield excavator 6 is excavated so as to be along the rubbing portion 9 as shown by a thick dashed line and a thin dashed line, thereby forming a tunnel cross section. Try to expand gradually.

When the front end of the shield excavator 6 reaches the widening portion 8 as shown by a thin broken line by the above-described widening excavation, a widening step of widening the shield frame 3 by the same amount of extra excavation as described above, Contrary to the time of entry into the rubbing portion 9 with the widening of the copy cutter, the excess digging process of reducing the relative digging amount by the set amount of digging and excavating per unit amount is performed alternately. As shown by the thick broken line, the entire length of the shield machine 6 is allowed to pass through the rubbing portion 9, and when the entire length of the shield machine 6 enters the widening portion 8, the excavation is terminated at that point, and thereafter, the shield frame The widening section 8 is constructed by excavating while keeping the widening state of 3 constant.

In the above, the step of excavating per unit amount while excavating the side face of the face with the set amount of extra excavation is repeated by the copy cutter until the entire length of the shield excavator enters the rubbing portion 9. Each time the shield frame 3 is excavated in a unit amount so that an unreasonable load is not applied to the
Is expanded while maintaining the parallel state of the left and right side shield frame bodies, so that the propulsion reaction force during over-digging can be stably received by the segment 10, resulting in a unit amount of Even if the amount of extra digging per unit is small, a large widening amount can be finally obtained without difficulty.
In addition, since the unit amount of the excavation is the width of the segment 10, the segment 10 having a slightly larger diameter can be assembled, and the connection from the main tunnel portion 7 to the widened portion 8 can be smoothly connected. it can.

It should be noted that the present invention is not limited to only the above-described embodiment, and it goes without saying that various changes can be made without departing from the spirit of the present invention.

[0017]

As described above, according to the method for widening a shield machine according to the present invention, the shield frame can be divided into a central shield frame body and left and right side shield frame bodies so that the width can be widened in the left-right direction. In the method of widening the shield machine, the widening section is constructed in the middle of the tunnel main section using the shielded machine that has been constructed, the tunnel main section and the widening section are connected in advance to a position before the widening section. In order to join, plan a grading part gradually expanding from the tunnel main line part to the widening part and forming it in an oblique direction as a whole, at the time when the front end of the shield machine reaches the rubbing part, by a copy cutter, The amount obtained by multiplying the amount of widening from the main tunnel section to the widening section by the unit amount equivalent to the width of the tunnel lining segment is divided by the length of the rubbed section. With the set amount, the cutting face side is dug by the unit amount while excavating, and then the dug amount by the copy cutter is further increased by the above-mentioned set amount, and the unit amount is dug again, and the shielding is performed. This process is repeated until the entire length of the excavator enters the rubbing portion, and then, until the front end of the shield excavator reaches the widening portion, the shield frame is paralleled by the left and right side shield frame bodies by the set amount of the above-mentioned excavation. The widening process for widening while maintaining the state and the extra digging process per unit amount, which digs while digging with a copy cutter, are performed alternately, and after that, the entire length of the shield digging machine passes through the slicing part and widens. Until entering the part, the above-mentioned shield frame widening process, and the unit that excavates by reducing the amount of extra digging by the copy cutter by the extra digging amount according to this widening By alternately performing the perforation excavation process per hit, when the entire length of the shield excavator has passed the rubbing part, the above excavation is completed, and the excavation is performed while maintaining the widened state of the shield frame constant Since the widening section is constructed, it is possible to carry out extra excavation without imposing an excessive load on the copy cutter, and to allow the segment to receive the propulsive reaction force stably, resulting in a large widening. Since the unit volume during the propulsion was set to the width of the segment, segments with different diameters were sequentially assembled to smoothly connect the boundary between the main tunnel section and the widening section. The effect is excellent.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing one embodiment of a method for widening a shield machine according to the present invention.

FIG. 2 is a schematic view showing an example of a shield machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 3 Shield frame 3a Side shield frame body 3b Central shield frame body 6 Shield excavator 7 Tunnel main line part 8 Widening part 9 Glue part 10 Tunnel lining segment

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Jun Sasaki 4-12-20 Nihonbashi Honcho, Chuo-ku, Tokyo Sato Industry Co., Ltd. Headquarters (72) Inventor Shigeo Fujii 11-1 Kitahamacho, Chita City, Aichi Prefecture Ishikawajima Harima Heavy Industries, Ltd. Aichi Factory (56) References JP-A-4-47094 (JP, A) JP-A-4-285291 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) ) E21D 9/06 301 E21D 9/08

Claims (1)

(57) [Claims] 1. A widening part is constructed in the middle of a tunnel main line part by using a shield excavator which divides a shield frame into a central shield frame body and left and right side shield frame bodies and is capable of widening in a horizontal direction. In the widening construction method of the shield machine, in advance, in front of the widening portion, in order to connect the main tunnel portion and widening portion of the tunnel, gradually widening from the main tunnel portion to the widening portion, as a whole oblique When the front end of the shield machine reaches the rubbing part, the width of the tunnel lining segment is increased by the copy cutter with respect to the amount of widening from the main tunnel part to the widening part. Excessive digging amount obtained by dividing the value obtained by multiplying the unit amount equivalent to the length of the rubbing part, and excavating only the unit amount while digging the side part of the face, Then, the dug amount by the copy cutter is further increased by the set amount of the above dug, the unit is dug again, and the process is repeated until the entire length of the shield excavator enters the rubbing portion. Until the front end of the machine reaches the widening section, a widening process to widen the shield frame by the set amount of the above-mentioned excavation while maintaining the parallel state of the left and right side shield frame bodies, and a unit to excavate while dug by a copy cutter Alternately excavating process per amount and then, until the entire length of the shield excavator enters the widening portion passing through the slicing part, and by using the copy cutter in accordance with this widening process of the shield frame and this widening The amount of extra digging is reduced by the extra digging amount, and the excavation process per unit quantity is performed alternately. Ri attached portion terminates the excess digging at the time of passing through a widening method of applying the shield machine, which comprises applying a widened part by causing the excavation to maintain the widened state of the shielding frame constant.