JP3408723B2 - Excavation method of different diameter tunnel - Google Patents

Description

BACKGROUND OF THE INVENTION [0001] [Technical Field of the Invention The present invention relates to drilling method for drilling a different diameter tunnel. 2. Description of the Related Art Conventionally, when a tunnel is excavated and only a part in the middle is excavated with a large diameter, a shaft is constructed in front of the part excavated with the large diameter, and the tunnel is excavated. Excavation was performed with a small-diameter shield machine, and another large-diameter shield machine was placed in the shaft, and a large-diameter tunnel was excavated from the shaft. [0003] According to the above-mentioned conventional excavation method, it is necessary to construct a shaft, and there is a problem that the construction cost is high and the construction period is long. [0004] Therefore, the present invention is to different diameter tunnel, i.e. the diameter in the middle excavating different tunnels, different diameter tunnel to obtain achieving reduction and shortening the construction period of the construction cost
The purpose of the present invention is to provide an excavation method. In order to solve the above-mentioned problems, a method of excavating a tunnel having a different diameter according to the present invention is provided at a front portion of a shield body so as to be rotatable and movable in a front-rear direction by a moving device. Connected to an annular hood member slidably provided in the front-rear direction on the outer peripheral portion of the shield main body by the retracting device, and a partition body forming a pressure chamber at a front portion of the shield main body. Using a shield machine equipped with a filled backing material injection pipe, and excavating a tunnel with a large diameter using a cutter head provided at the front of the shield body. After that, the cutter head is retracted rearward, and then the hood member provided on the outer peripheral portion of the shield main body is made to protrude forward, and then the backing material is injected from the pressure chamber to the outside, and then the small diameter of After the other shield machine that has excavated the tunnel is located in the hood member protruding from the shield body of the shield machine, the backing material is injected from the pressure chamber to the ground side in the other shield machine. To improve the ground, and then to form the outer shells of both shield machine
With leaving Plates and said hood member to dismantle both the shield machine, formed between the skin plate in <br/> skin plate and the hood member or large diameter side of the shield machine in the other shield machine This is a method of excavating a tunnel with a different diameter by closing the annular gap to be formed with an annular plate. According to the above-mentioned excavation method, when joining tunnels having different diameters, an annular hood member is provided on a shield body side of a shield machine for excavating a large-diameter tunnel so as to be able to move back and forth in the front-rear direction. At the same time, after moving another shield excavator for excavating a small-diameter tunnel to a position in front of the large-diameter shield excavator in the hood member, leaving both skin plates and the hood member of both shield bodies, By dismantling the excavator,
It is possible to excavate a different diameter tunnel easily and quickly. Further, when joining tunnels of different diameters, after excavating a large-diameter tunnel, the cutter head is retracted with respect to the shield main body, so that a small-diameter shield excavator can enter deeply. Can and therefore
The two shield excavators can be easily located at very close distances. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method of excavating a tunnel of a different diameter by a shield machine for excavating a tunnel of a different diameter according to an embodiment of the present invention will be described below with reference to FIGS. First, a shield machine for excavating a tunnel having a different diameter will be described with reference to FIGS. The shield machine for excavating a tunnel having a different diameter in the present embodiment is for excavating a tunnel having a large diameter, and this large diameter tunnel and a small diameter tunnel having a smaller diameter can be easily and quickly joined. To be able to do it. It should be noted that the reference diameter for distinguishing between the small diameter and the large diameter is not specially determined, but merely for convenience of distinguishing tunnels having different diameters.
Only the terms large diameter and small diameter are used. That is, as shown in FIGS. 1 and 2,
The shield drilling machine 1 for a large diameter has a cylindrical main body 14 interposed between a large-diameter shield main body 11 and a partition wall 13 for forming a pressure chamber 12 provided at a front portion of the shield main body 11. A large-diameter cutter head 15 supported rotatably and movably in the front-rear direction, and a rotation driving device (for example, a hydraulic motor or the like) arranged in the shield main body 11 to rotate the cutter head 15. 16), a moving hydraulic cylinder (an example of a moving device) 17 that is also arranged in the shield main body 11 and moves the cutter head 15 in the front-rear direction, and a skin plate that constitutes an outer peripheral portion of the shield main body 11 A hood member 18 formed of an annular plate and slidably disposed in the front-rear direction on the outer peripheral surface of the hood 11a, and the hood portion provided on the inner surface of the shield body 11 18 is composed of front and rear (an example of projecting and retracting device) Hydraulic cylinders for retraction out makes extending and retracting in the direction 19.. The distal end of the rod portion 19a of the hydraulic cylinder 19 is inserted into a hole 11b formed in the skin plate 11a of the shield main body 11 to be connected to the hood member 18 and to be connected to the cylinder main body. 1
9b is supported inside the skin plate 11a.
A copy cutter device 20 is arranged on the outer peripheral portion of the cutter head 11. Further, a mud feed pipe 21 for supplying muddy water into the pressure chamber 12 is connected to an upper portion of the partition body 13 on the shield main body 11 side, and a pressure chamber 1 is provided to a lower portion thereof.
A drain pipe 22 for discharging the slurry-like earth and sand in 2 is connected, and further, a backing material injection pipe 23 is connected. Next, a method of excavating a tunnel of a different diameter by the shield machine will be described with reference to FIGS. In this description, the shield machine 1
When excavating a large-diameter tunnel and excavating a small-diameter tunnel using a normal shield excavator (other shield excavator) without a hood member, and joining these two tunnels to excavate a different-diameter tunnel Will be described. In FIGS. 3 to 5, hatching indicating a cross section is omitted. First, as shown in FIG. 3, after the excavation by the large-diameter shield excavator 1 is completed, the copy cutter device 20 provided on the cutter head 15 is retracted.
Then, through the mud feeding pipe 21 and the drain pipe 22, the pressure chamber 1
2 to supply high-concentration mud (in this case, the drainage pipe 22
High mud is supplied from). Next, as shown in FIG. 4, the cutter head 15 is moved by the moving hydraulic cylinder 17 to the shield body 1.
1 (shown by an arrow a), the hood member 18 is made to protrude toward the ground side (shown by an arrow b) by an evacuation hydraulic cylinder 19, and the backing material injection pipe 2
From 3, a backing material (indicated by hatching with a cross in the drawing) is injected into the pressure chamber 12 and into the front ground side to solidify the ground. Next, as shown in FIG. 5, the shield excavator 2 excavated from the opposite side is connected to the hood member 18.
After stopping at the front position of the cutter head 15 on the side of the large-diameter shield excavator 1, the cutter head 4 provided at the front of the shield body 3 of the small-diameter shield excavator 2,
That is, the backing material is injected from the backing material injection pipe (not shown) to the outside to further solidify the ground at the peripheral portion (indicated by hatching with crosses). As shown in FIG. 6, when the ground around the opposing portions of the shield excavators 1 and 2 is solidified, the skin plates 11a and 3a of the shield bodies 11 and 3 and the hood member 18 are left. By dismantling the shield excavators 1 and 2 and closing the gap between the hood member 18 (or the skin plate 11) and the skin plate 3a with the annular plate 5, the two tunnels 6 and 7 having different diameters can be connected to each other. Can be joined. That is, unlike the related art, a tunnel with a different diameter can be easily and quickly excavated without providing a shaft. As described above, the excavation of the tunnel of the different diameter according to the present invention is carried out.
According to the shaving method, when joining tunnels having different diameters to each other, an annular hood member is provided on the shield body side of a shield machine for excavating a tunnel having a large diameter so as to be able to move back and forth in the front-rear direction, and a small diameter is provided. After moving the other shield excavator for excavating the tunnel to the front position of the large-diameter shield excavator in the hood member, disassembling both shield excavators while leaving the skin plate and the hood member of both shield bodies. By doing so, a different diameter tunnel can be easily (quickly) excavated (constructed) without using a shaft as in the related art. Further, when joining tunnels of different diameters, after excavating a large-diameter tunnel, the cutter head is retracted with respect to the shield body, so that a small-diameter shield excavator can enter deeply. Can and therefore
Position with a very close distance both shield machine between Te
Since capable of, Ki out to minimize the amount of Urakomi material to be injected into the natural ground, further hood member retraction of the cutter head
Because it is projected into the entry part, it can be easily projected
it can.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall sectional view of a large-diameter shield excavator according to an embodiment of the present invention. FIG. 2 is a view as viewed in the direction of arrows AA in FIG. 1; FIG. 3 is a cross-sectional view illustrating an excavation work of the different diameter tunnel in the embodiment. FIG. 4 is a cross-sectional view for explaining an excavation operation of the different-diameter tunnel in the embodiment. FIG. 5 is a cross-sectional view for explaining an excavation operation of the different-diameter tunnel in the embodiment. FIG. 6 is a cross-sectional view for explaining an excavation work of the different diameter tunnel in the embodiment. [Description of Signs] 1 Large-diameter shield excavator 2 Small-diameter shield excavator 3 Shield body 3a Skin plate 4 Cutter head 5 Ring plate 6, 7 Tunnel 11 Shield body 11a Skin plate 11b Hole 12 Pressure chamber 15 Cutter head 17 Hydraulic cylinder for moving 18 Hood member 19 Hydraulic cylinder for going in and out 21 Mud pipe 22 Mud drain pipe 23 Backing material injection pipe

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Yuji Tanaka               3-28 Nishikujo 5-chome, Konohana-ku, Osaka-shi, Osaka               No. Within Hitachi Zosen Corporation (72) Inventor Yuichi Nakamura               3-28 Nishikujo 5-chome, Konohana-ku, Osaka-shi, Osaka               No. Within Hitachi Zosen Corporation

Claims (1)

(57) [Claims 1] A cutter head rotatably provided at a front portion of a shield main body and movably provided in a front-rear direction by a moving device, and a cutter head provided by a retractable device. A shield excavator having an annular hood member provided slidably in the front-rear direction on the outer peripheral portion, and an injection pipe of a backing material connected to a partition wall forming a pressure chamber at a front portion of the shield body. A method for excavating a tunnel with a different diameter using a cutter head provided at the front of the shield body, after excavating a large-diameter tunnel, retracting the cutter head backward, After projecting the hood member provided on the outer periphery of the main body to the front, the backing material is injected from the pressure chamber to the outside, and then the other shield excavator that has excavated a small-diameter tunnel is the shield excavator. of After it positioned in the hood member protruded from Rudo body, outside in the other shield machine, soil improved by injecting the earth mountain a Urakomizai from the pressure chamber, then the both shield machine Each skin that forms a shell
Rate and with dismantling the two shield machine, leaving the hood member, formed between the skin plate in love <br/> down plate and the hood member or large diameter side of the shield machine in the other shield machine An excavation method for a tunnel with a different diameter, wherein the tunnel with a different diameter is excavated by closing an annular gap to be formed with an annular plate.