JP2004324256A - Shield machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shield machine which enables construction of a greatly curved tunnel and directional correction to be easily performed while the tunnel is driven, and can be easily recovered to the side of a starting shaft without being dismantled after excavation, in a shield method wherein a following pipe is buried along with the excavation of the tunnel. <P>SOLUTION: An outer shell of the shield machine A has a double structure which is composed of an inner cylinder 1 equipped with an excavating means etc., and an outer cylinder 2 covering the inner cylinder 1; the inner and outer cylinders 1 and 2 are split into front drum parts 1A and 2A and rear drum parts 1B and 2B via buckling parts 3 and 5; four-side inner peripheral surfaces of the drum parts 1A and 1B of the inner cylinder 1 are coupled together by a direction correcting jack 9 so that the drum parts 1A and 2A of the inner and outer cylinders 1 and 2 can be concurrently bent in the same direction from the buckling parts 3 and 4 with respect to the drum parts 1B and 2B by the operation of the jack 9; and a diameter of a cutter head 12 can be made smaller than an inside diameter of the outer cylinder 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a shield excavator in which a pipe is buried while excavating a tunnel to a predetermined length in the ground, and then removed and collected backward through the pipe.
[0002]
[Prior art]
In the shield work for forming a pipeline in the ground, a shield excavator is excavated from the starting shaft side toward the reaching shaft, and every time a tunnel of a certain length is excavated, the shield excavator is followed by the shield excavator for a fixed length. Long buried pipes are sequentially added to form a pipeline, and a shield excavator that has reached the reaching shaft is usually recovered from the inside of the reaching shaft to the ground, but an existing person on the reaching side If the arrival shaft is not provided due to the presence of holes, etc., after excavation, the shield excavator must be dismantled and removed to the starting shaft side through the tunnel and collected. There is a problem that the work requires remarkable labor and labor.
[0003]
For this reason, a shield excavator is inserted and fixed in the head buried pipe, and the cutter head of the shield digger protruding forward from the opening end of the head buried pipe is buried on the starting shaft side while rotating. By pushing the pipe, the shield excavator is excavated to excavate the tunnel, and every time a certain length of tunnel is excavated, a buried pipe is sequentially added to form a pipeline, and then, after excavation is completed, After reducing the cutter head to be smaller than the inner diameter of the buried pipe and releasing the fixation of the shield excavator to the first buried pipe, retreat to the starting shaft through the pipeline without dismantling the shield excavator, 2. Description of the Related Art Recovery from a starting shaft to the ground side is performed (for example, see Patent Document 1).
[0004]
[Patent Document 1]
JP-A-3-267497 (pages 2 to 5, FIG. 1)
[0005]
[Problems to be solved by the invention]
However, in the structure in which the shield excavator is inserted into the buried pipe as described above, the shield excavator cannot be configured so that the curved excavator can be constructed by using the shield excavator as a middle-bend type, and the range of use is limited. There are points. Further, it is disclosed that the joint between the first buried pipe and the next buried pipe can be bent so that the direction can be corrected. Excavation of the ground must be increased, and it is difficult to construct a largely bent curved tunnel because it is not possible to obtain a small angle of refraction in spite of increasing the extra excavation.
[0006]
Further, when the joint of the buried pipe is allowed to be bent as described above, the entire length of the shield excavator is limited to a short length that can be inserted into the buried pipe, so that the structure of the equipment disposed inside is limited. There is a problem that there is a possibility that the influence may occur.
[0007]
The present invention has been made in view of such problems, and an object of the present invention is to make it possible to easily construct and correct the direction of a largely curved curved tunnel during tunnel excavation, and to make a pipeline after tunnel excavation. It is an object of the present invention to provide a shield excavator that can be removed and recovered backward through the inside.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a shield excavator according to the present invention has a shield excavator having an outer shell formed in a double structure of an outer cylinder and an inner cylinder. After excavating a tunnel of a predetermined length, the inner cylinder provided with excavation means such as a cutter head can be removed rearward with the outer cylinder remaining as a guide while the outer cylinder is left. In the shielded excavator, the inner and outer cylinders are each divided into front and rear body parts via a bendable bent part, and the front end facing surfaces of the front body parts of these inner and outer cylinders are slidably joined to each other. Further, several places between the front and rear body parts of the inner cylinder are connected at predetermined intervals in the circumferential direction by direction correction jacks, and the front body part of the inner and outer cylinders is rear body part by the operation of these direction correction jacks. From each bent part Sometimes it is configured so as to refract in the same direction.
[0009]
In the shield excavator configured as described above, the invention according to claim 2 is characterized in that the outer end of the outer cylinder has an inwardly inclined end surface that is inclined obliquely inward from the inner peripheral surface of the outer cylinder toward the inside. The locking member is provided integrally, while the front end of the inner cylinder is provided integrally with an inner locking member having an outwardly inclined end face that is inclined obliquely inward from the outer peripheral surface side of the inner cylinder toward the inside. The outwardly sloping end surface of the inner locking member is formed in a joint portion which is detachably engaged with and locked to the inwardly sloping end surface of the outer locking member from the rear side. The outer diameter of the cutter head of the main body can be reduced until it becomes smaller than the inner diameter of the outer cylinder, and the inner cylinder rear body and the outer cylinder rear body can be freely attached to and detached from the inner cylinder rear body. Characterized in that a gripper is connected to the gripper.
[0010]
Further, the invention according to claim 3 is characterized in that a front end of a pulling rod is connected to a rear body of the inner cylinder.
[0011]
[Action]
At the time of direction correction or construction of a curved tunnel, when the direction correction jack connecting the front and rear body parts of the inner cylinder of the shield excavator equipped with the excavation means such as the cutter head is actuated, The front body of the inner cylinder is bent from the bent portion in accordance with the operation amount of the direction correcting jack. At this time, the refraction of the inner cylinder front trunk portion is transmitted to the outer cylinder front trunk portion via a joint between the front end outer peripheral surface side and the front end inner peripheral surface side of the outer cylinder front trunk portion, and the front of the outer cylinder is The trunk also bends in the same direction at the same time with respect to the rear trunk.
[0012]
As a structure of such a joint portion between the front end portions of the front and rear portions of the inner and outer cylinders, the invention described in claim 2 integrally provides an outer locking member having an inwardly inclined end surface on the inner peripheral surface of the front end of the outer cylinder. On the other hand, an inner locking member having an outwardly inclined end surface is integrally provided on the outer peripheral surface of the front end of the inner cylinder, and the outwardly inclined end surface of the inner locking member is set to the inwardly inclined end surface of the outer locking member. Slidably abuts and locks on the inner cylinder. Therefore, when the front body of the inner cylinder is bent from the center bend with respect to the rear body, The locking member causes the outer locking member of the outer cylinder front body to bend in the same direction from the bent portion with respect to the rear cylinder of the outer cylinder, so that direction correction and curve tunneling during excavation can be easily performed. .
[0013]
In addition, every time a fixed length tunnel is excavated by a shield excavator, a fixed length of buried pipe is sequentially connected to the outer cylinder while being propelled and buried in the tunnel. When the rear end is pushed forward, the propulsion force is applied from the foremost buried pipe to the rear trunk of the outer pipe, from the rear trunk of the outer pipe to the rear trunk of the inner pipe via the gripper, and from the rear trunk of the inner pipe to the direction correcting jack. Through the inner pipe front body portion, the outer sloping end surface of the inner locking member of the inner tube front body portion to the inward sloping end surface of the outer locking member of the outer tube front body portion, and the shield excavation is performed. The entire machine excavates.
[0014]
Next, when collecting the shield excavator while leaving the outer cylinder after the tunnel excavation of the predetermined length, the cutter head is reduced so as to have a smaller diameter than the inner diameter of the outer cylinder, and the rear body of the inner and outer pipes is gripped by the gripper. After the connection is released, when the inner cylinder is pulled rearward by a pulling rod or the like, an outwardly inclined end surface of an inner locking member integrally provided at a front end of the inner cylinder is integrally provided at a front end of the outer cylinder. The shield excavator can be removed to the starting shaft side and recovered in a state where the outer cylinder is left in the ground away from the outwardly inclined end face of the inner locking member and left behind.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, a specific embodiment of the present invention will be described with reference to the drawings. The shield excavator A covers the outer shell of the inner cylinder 1 made of a steel pipe and the outer peripheral surface of the inner cylinder 1 at a small interval. The inner and outer cylinders 1 and 2 are divided into a front body 1A and 2A and a rear body 1B and 2B, respectively. The divided portions, that is, the rear end portions of the front body portions 1A and 2A and the front end portions of the rear body portions 1B and 2B are connected to each other via bent portions 3 and 4 which are refractible to each other. In this case, the center bent portion 3 connecting the front and rear body portions 1A and 1B of the inner cylinder 1 is positioned closer to the front side than the center bent portion 4 connecting the front and rear body portions 2A and 2B of the outer tube 2 to each other. So that the front body portions 1A, 2A can be smoothly and simultaneously refracted through the bent portions 3, 4 without contacting the front body portions 1A, 2A with the rear body portions 2A, 2B. .
[0016]
The middle bent portions 3 and 4 are formed in the shape of an arc of the rear body portions 1B and 2B of the inner and outer cylinders 1 and 2 on the inner peripheral surface of the front end portions 1A and 2A of the inner and outer cylinders 1 and 2 via a sealing material 20. As shown in FIG. 3, the front end outer peripheral surface of the inner cylinder 1 is slidably contacted with the inner peripheral surface of the front and rear body portions 1 </ b> A and 1 </ b> B. Direction-correcting jacks 5, 5, 5, 5 whose front and rear ends are respectively connected to the rear end of the inner peripheral surface of the front trunk 1A and the front end of the rear trunk 1B via 3 are provided.
[0017]
That is, the front ends of the rods of these direction correcting jacks 5 are formed on the four sides of the rear surface of the disk-shaped rear partition wall 11 having the outer peripheral surface integrally fixed to the inner peripheral surface of the rear end portion of the front body 1A of the inner cylinder 1. The rear end is connected to a bracket 23 projecting from the inner peripheral surface of the front end of the rear barrel 1B of the inner cylinder 1 by a pin 22 that is rotatably connected to a projecting piece 21 projecting rearward. It is rotatably connected by a pin 24. When the arbitrary direction correcting jack 5 is extended, the center bent portions 3, 4 center on the front end pivot pin 22 of the direction correcting jack 5 diametrically opposed to the direction correcting jack 5 in the inner cylinder 1. It is configured to be refracted as. In addition, while the arbitrary direction correcting jack 5 is extended by a fixed amount, the direction correcting jack 5 and the direction correcting jack 5 diametrically opposed to the inner cylinder 1 are contracted by the same amount, so that the center bent portions 3 and 4 are bent. May be refracted.
[0018]
In addition, slide shoes 6, 6 having a fixed height are integrally provided at least on the lower peripheral surface of the front and rear portions of the outer peripheral surface of the rear trunk portion 1B of the inner cylinder 1, and the top surface of the slide shoes 6, 6 is attached to the outer cylinder The inner peripheral surface of the rear trunk portion 2B is slidably supported in the front-rear direction, and a gap equal to the height of the slide shoe 6 is provided between the inner and outer cylinders 1 and 2.
[0019]
Further, the front end facing surfaces of the front body portions 1A and 2A of the inner and outer cylinders 1 and 2, ie, the front end outer peripheral surface of the front body portion 1A of the inner cylinder 1 and the front end inner peripheral surface of the front body portion 2A of the outer cylinder 2 Are slidably joined to each other. Specifically, at the front end of the front body 2A of the outer cylinder 2, the outer peripheral surface is formed flush with the outer peripheral surface of the outer cylinder 2 and the inner peripheral surface 8a is formed at the inner peripheral surface of the front body 2A of the outer cylinder 2. An annular outer locking member 8 protruding inward by a certain thickness from the outside is integrally fixed, and the rear end surface of the outer locking member 8 is formed on the inner peripheral surface of the front body portion 2A of the outer cylinder 2. Is formed on an inwardly inclined end face 8b which is inclined forward and inward from the inside.
[0020]
On the other hand, at the front end of the front body portion 1A of the inner cylinder 1, the rear half of the outer peripheral surface is formed flush with the outer peripheral surface of the inner cylinder 1, and the front half is formed on the outer peripheral surface 7a having a smaller diameter than the rear half. And an inner locking member 7 having the outer peripheral surface 7a slidably joined to the inner peripheral surface 8a of the outer locking member 8 of the outer cylinder 2 via a seal member 25, and integrally fixed thereto. Further, between the rear end of the outer peripheral surface 7a of the inner locking member 7 and the front end of the outer peripheral surface of the rear half, an outwardly inclined end surface 7b inclined obliquely inward from the outer peripheral surface side is formed. The outwardly inclined end face 7b is brought into contact with and locked to the inwardly inclined end face 8b from the rear side, so that they are slidably engaged with each other.
[0021]
Also, as shown in FIG. 3, grippers 9, 9 composed of hydraulic jacks are arranged and fixed in the rear part of the rear body part 1B of the inner cylinder 1 in the vertical direction or the left and right directions, as shown in FIG. The outer cylinder 2 is opposed to the end face of the rod body 9a through a through-hole 1C which penetrates the rod body 9a having a circular cross section of the gripper 9 to the rear part of the rear body part 1B of the inner cylinder 1 over the inner and outer peripheral surfaces. It is fitted in a circular recess 2C provided in the rear inner peripheral surface of the body 2B so as to be freely detachable, and the rear body 1B, 2B of the inner and outer cylinders 1, 2 cannot be deviated in the circumferential direction, the radial direction, and the length direction. Connected and fixed to.
[0022]
Further, as shown in FIGS. 4 and 5, a rolling prevention member 29 is protruded rearward on the outer peripheral portion of the rear partition wall 11 in the front body portion 1A of the inner cylinder 1, and the rolling prevention member 29 is moved inside. Inserted between stopper pieces 30, 30 protruding from both sides of the inner peripheral surface of the front end of the rear trunk portion 1 </ b> B of the cylinder 1, both sides of the anti-rolling member 29 are inserted into the opposing faces of these stopper pieces 30, 30. The abutment prevents the front trunk portion 1A from rolling with respect to the rear trunk portion 1B.
[0023]
The shield excavator A has a cutter head 12 protruding forward from an opening at the front end of the inner cylinder 1, and a rotation center shaft portion 13 of the cutter head 12 is stretched to the front of the inner cylinder 1. The cutter head 12 is rotatably supported at the center of the partition wall 14, and is configured to rotate the cutter head 12 via the meshing gear 16 by a motor 15 mounted on the rear surface of the rear partition wall 11.
[0024]
As shown in FIGS. 1 and 2, the cutter head 12 has a plurality of cutter heads (four in FIG. 1) each having a length shorter than the inner diameter of the inner cylinder 1 from the front end of the rotation center shaft portion 13 toward the outer diameter direction. The hollow spokes 12a are radially projected, and the outer ends of the adjacent hollow spokes 12a, 12a are integrally connected by an outer peripheral ring portion 12b. An arm member 12c having a plurality of cutter bits 17a projecting therefrom and having a cutter bit 17b projecting from the front or outer end face thereof is provided in the hollow spoke portion 12a. From the inner and outer radial directions. The arm members 12c having the cutter bits 17b protruding from the front surface and the arm members 12c having the cutter bits 17b protruding from the outer end are alternately arranged.
[0025]
In a state where each arm member 12c is projected from the outer end of the hollow spoke portion 12a, the outer diameter of the cutter head 12 set between the outer ends of the hollow spoke portions 12a, 12a arranged in the diametrical direction becomes larger. When the arm member 12c is immersed in the hollow spoke portion 12a, the outer diameter of the cutter head 12 is smaller than the inner diameter of the outer cylinder 2 when the arm member 12c is immersed in the hollow spoke portion 12a. , Is configured to be equal to or smaller than the inner diameter of the inner cylinder 1.
[0026]
The means for causing the arm member 12c to protrude and retract from the outer end opening of the hollow spoke portion 12a is provided by disposing a jack 18 in the hollow spoke portion 12a and integrally connecting the rod end to the inner end surface of the arm member 12c. A center bit 17c is provided on the front surface of the rotation center shaft portion 13 of the cutter head 12.
[0027]
The space between the rear surface of the cutter head 12 and the front surface of the front partition wall 14 configured as described above is formed in a sediment chamber 10 in which sediment excavated by the cutter head 12 is temporarily stored. The excavated earth and sand is discharged backward from the chamber 10 through a discharge pipe 19. Further, muddy water is supplied into the hollow of the rotation center shaft portion 13 of the cutter head 12 through a muddy water injection pipe 26, and the muddy water is discharged from the front end face of the rotation center shaft portion 13 toward the face, and excavated by the cutter head 12. The sediment thus obtained is taken into the sediment chamber 10 together with the muddy water, the sedimentary chamber is maintained at a constant muddy water pressure to prevent collapse of the face, and the excavated sediment is stirred with the muddy water and discharged through the above-mentioned discharging pipe 19. ing.
[0028]
Further, the muddy water injection pipe 26 is connected to and communicates with the center of the rear end of the rear barrel 1B of the inner cylinder 1, and a hollow for introducing muddy water into the hollow of the rotation center shaft 13 of the cutter head 12. A pipe 27 is provided. The rear end of the hollow pipe 27 is closed by an end plate 28, and the end plate 28 is used to pull out the inner cylinder 1 from the outer cylinder 2 of the shield excavator A backward. The front end of the pull-out rod 18 is detachably connected. The pulling rod 18 is not limited to the hollow tube 27 but may be connected to an appropriate position on the rear end side of the inner cylinder 1.
[0029]
A front end of a tube 1D having a control panel and the like installed therein is detachably connected to a rear end of the rear trunk portion 1B of the inner cylinder 1. The tubular body 1D is formed to have the same outer diameter as the rear trunk portion 1B and protrudes rearward from the rear end of the rear trunk portion 2B of the outer cylinder 2.
[0030]
Next, the operation of the shield excavator A configured as described above will be described. First, in order to mount the inner cylinder 1 in the outer cylinder 2 of the shield excavator A, the outer excavator A of the shield excavator A needs to be mounted. The front body 1A of the inner cylinder 1 is inserted from the rear end of the rear body 2B of the outer cylinder 2 with the diameter reduced to be smaller than the inner diameter of the outer cylinder 2 and the gripper 9 contracted. When the front end of the front body 1A of the inner cylinder 1 reaches the front end of the front body 2A of the outer cylinder 2, the outer periphery of the inner locking member 7 provided integrally with the front end of the front body 1A of the inner cylinder 1 The surface 7a is slidably fitted to the inner peripheral surface 8a of the outer locking member 8 provided integrally with the front end of the front trunk portion 2A of the outer cylinder 2 via a sealing material 25, and the inner locking member 7 The outwardly inclined end surface 7b abuts and engages with the inwardly inclined end surface 8b of the outer locking member 8 to prevent the inner cylinder 1 from moving further forward. The grippers 9, 9 disposed inside the rear trunk portion 1B of the inner cylinder 1 form circular recesses 2C, 2C formed on the inner peripheral surface of the rear trunk portion 2B of the outer cylinder 2. Reach
[0031]
In this state, the grippers 9 are opposed to the circular recesses 2C and 2C, respectively, and the rod body 9a of the gripper 9 is extended and its end is fitted and locked in the circular recess 2C. The inner cylinder 1 is mounted in the outer cylinder 2 by connecting and fixing the rear trunk portions 1B, 2B to each other in a circumferential direction, a radial direction, and a longitudinal direction so as not to be deviated. At the time of mounting, the excavating means such as the cutter head 12 and the motor 15, and also the earth discharging pipe 19 and the direction correcting jack 5 are removed from the inner cylinder 1, and the inner cylinder 1 is inserted into the outer cylinder 2. The shield excavator A may be configured by incorporating a drilling means or the like into the inner cylinder 1 after the inner locking member 7 is inserted into the outer locking member 8 until the inner locking member 7 contacts and engages with the outer locking member 8.
[0032]
The shield excavator A configured as described above is installed in the starting shaft B, and the arm member 12c projects from the outer end opening of each hollow spoke portion 12a of the cutter head 12 to reduce the outer diameter of the cutter head 12 to the outer cylinder 2. The cutter head 12 is rotated in a state where the diameter of the cutter head 12 is increased to be equal to or slightly larger than the outer diameter of the starting shaft B, and the cutter head 12 is pushed forward by a propulsion means C such as a propulsion jack provided in the rear portion of the starting shaft B. Dig through the tunnel.
[0033]
When the shield excavator A propells the ground from the starting shaft B into the ground, the front end of the buried pipe D made of a fixed length fume pipe or steel pipe is connected to the rear end of the rear trunk 2B of the outer cylinder 2, The rear end of the buried pipe D is pushed forward by the propulsion means C, and the shield excavator A is further excavated along the tunnel planning line in a state where the buried pipe D follows the outer cylinder 2 of the shield excavator A.
[0034]
The propulsive force of the propulsion means C is first transmitted from the buried pipe C to the rear trunk 2B of the outer pipe 2 of the shield excavator A following this buried pipe C, and then transmitted from the outer pipe rear trunk 2B. The power is transmitted to the rear body 1B of the inner tube 1 via the gripper 9, and further transmitted from the rear body 1B of the inner tube to the front body 1A of the inner tube via the direction correcting jack 5 and the front body of the inner tube. Inward of the outer locking member 8 fixed to the front end of the outer tube 2 joined to the outwardly inclined end face 7b via the outwardly inclined end face 7b of the inner locking member 7 fixed to the front end of the portion 1A. The power is transmitted to the inclined end face 8b, and the inner and outer tubes 1, 2 are simultaneously and integrally propelled. That is, the shield excavator A excavates by the propulsive force of the propulsion means C.
[0035]
Then, every time a tunnel of a fixed length is excavated by the shield excavator A, the buried pipe D is sequentially pushed forward while being added on the starting shaft side to form a pipeline as shown in FIG. In addition, the earth and sand excavated by the cutter head 12 of the shield excavator A is discharged from the earth and sand chamber 10 to the starting shaft B through the earth discharging pipe 19.
[0036]
During tunnel excavation, if the planned tunnel for forming the pipeline is curved, or if it is necessary to correct the direction, the gap between the front and rear body portions 1A, 1B of the inner cylinder 1 of the shield excavator A is established. By operating a predetermined direction correcting jack 5 among the four direction correcting jacks 5 connected to each other, the directions of the front trunks 1A, 2A of the inner and outer cylinders 1, 2 of the shield excavator A are changed to the rear trunks 1B, 2B. Orient to the planned curve tunnel or to the direction you want to correct.
[0037]
For example, as shown in FIG. 7, when it is desired to change the direction to the right, the right direction correcting jack 5 is inactivated and the left direction correcting jack 5 is extended, so that the front body 1A of the inner cylinder 1 is extended. Is bent rightward from the center bent portion 3 with respect to the rear trunk portion 1B. The angle of refraction can be adjusted to be large or small by the amount of extension of the left direction correcting jack 5. When the front body portion 1A of the inner cylinder 1 attempts to bend rightward from the center bent portion 3 with respect to the rear body portion 1B, the outer cylinder 2 covering the outer peripheral surface of the inner cylinder 1 with a gap therebetween. 2A, the inner peripheral surface 8a of the outer locking member 8 fixed to the front end thereof is attached to the outer peripheral surface 7a of the inner locking member 7 fixed to the front end of the front body 1A of the inner cylinder 1. Because of the sliding contact, the outer locking member 8 is pressed rightward by the inner locking member 7, so that the front body 2 </ b> A of the outer cylinder 2 is separated from the rear bent part 4 by the rear body 2 </ b> B. It bends in the same direction as the front body 1A of the inner cylinder 1 at the same time, so that the direction correction and the construction of the curved tunnel during excavation can be performed easily and accurately.
[0038]
In order to easily bend the front body portions 1A, 2A with respect to the rear body portions 1B, 2B of the inner and outer tubes 1, 2, the arm member 12c is further removed from the hollow spoke portion 12a of the cutter head 12 by the outer diameter of the outer tube 2. The outer periphery of the face is dug out by protruding outward.
[0039]
Next, after excavating a tunnel of a predetermined length by the shield excavator A, when removing and recovering the shield excavator A while leaving the outer cylinder 2 underground, first, the arm member 12c of the cutter head 12 is hollowed. The outer diameter of the cutter head 12 is made smaller than the inner diameter of the outer locking member 8 fixed to the front end of the outer cylinder 2 by being immersed in the spoke portion 12a, and the rod body 9a of the gripper 9 is contracted. The connection between the rear trunk portions 1B and 2B of the inner and outer cylinders 1 and 2 is thereby released. Further, a pulling rod 18 is connected to the rear end of the inner cylinder 1.
[0040]
Thereafter, when the pulling rod 18 is pulled rearward, the outwardly inclined end face 7b of the inner locking member 7 fixed to the front end of the inner cylinder 1 is fixed to the outer locking surface fixed to the front end of the outer cylinder 2. A longitudinal slide in which the member 8 is disengaged from the inwardly inclined end surface 8b and is separated rearward from the inwardly inclined end surface 8b, and the inner cylinder 1 projects from the lower peripheral surface of the front and rear portions of the outer peripheral surface of the body 1B thereafter. The shoes 6, 6 are moved rearward while sliding on the inner peripheral surface of the rear trunk portion 2B of the outer cylinder 2, and are collected in the starting shaft B through the pipeline by the buried pipe D. In this way, the entire shield excavator except the outer pipe 2, that is, the inner cylinder 1 provided with the excavating means and the like is placed in the starting shaft B while the outer tube 2 is left in the ground. It is to be collected and removed from the ground. When the shield excavator A is collected, the ground in front of the cutter head may be solidified by injecting a chemical solution or the like.
[0041]
【The invention's effect】
As described above, according to the shield excavator of the present invention, the outer shell of the shield excavator has a double structure of an outer cylinder and an inner cylinder, and these inner and outer cylinders are respectively bent via refractible middle bent portions. It is divided into front and rear body parts, and the front end opposing surfaces of the front body part of the inner cylinder are slidably joined to each other. Further, several places between the front and rear body parts of the inner cylinder are circumferentially spaced at predetermined intervals. Because the direction correction jack is connected to the inner cylinder front body, the inner cylinder front body can be easily moved from the middle bend according to the amount of operation of the direction correction jack by operating the direction correction jack. In addition to being able to bend, the refraction of the inner cylinder front body portion is directly transmitted to the outer cylinder front body portion via a joint between the front end outer peripheral surface side and the front end inner peripheral surface side of the outer cylinder front body portion. The front body of the outer cylinder can also be easily bent in the same direction with respect to the rear body at the same time. . Therefore, the direction of the shield excavator during excavation and the construction of a curved tunnel by the shield excavator can be accurately and efficiently performed.
[0042]
According to the second aspect of the present invention, an outer locking member having an inwardly sloping end surface is integrally provided on the inner peripheral surface of the front end of the outer cylinder, while an outwardly inclined member is provided on the outer peripheral surface of the front end of the inner cylinder. An inner locking member having an end surface is integrally provided, and an outwardly inclined end surface of the inner locking member is slidably abutted against and locked to an inwardly inclined end surface of the outer locking member. If the front barrel of the inner cylinder is bent from the bent portion with respect to the rear barrel by the operation of the direction correcting jack, the outer locking member of the outer cylinder front body is provided by the inner locking member of the inner cylinder front body. Can be smoothly refracted in the same direction from the center bent portion with respect to the outer cylinder rear trunk portion.
[0043]
Further, the outer diameter of the cutter head can be reduced until the outer diameter of the cutter head becomes smaller than the inner diameter of the outer cylinder, and the inner cylinder rear body and the outer cylinder rear body are detachably attached to the inner cylinder rear body. Since it is equipped with a gripper that freely connects, every time a tunnel of a certain length is excavated by a shield excavator, when burying pipes of a certain length are sequentially connected to the outer cylinder while propelling and burying in the tunnel, By pushing the rear end of the buried pipe by the propulsion jack from the starting shaft side, the propulsion force is applied to the buried pipe, the back body of the outer pipe, the gripper, the back body of the inner pipe, the direction correcting jack, the front body of the inner pipe, The inner and outer pipes are sequentially transmitted to the outwardly inclined end face of the inner locking member of the inner pipe front body part and the inwardly inclined end face of the outer locking member of the outer pipe front body part, and the inner and outer pipes are forwardly and backwardly bent through the bent part. That the entire shield excavator is excavated Can.
[0044]
In addition, after the tunnel excavation of a predetermined length, when collecting the shield excavator while leaving the outer cylinder, the cutter head is reduced to a diameter smaller than the inner diameter of the outer cylinder, and the rear body of the inner and outer pipes is gripped by the gripper. After the connection is released, when the inner cylinder is pulled rearward by a pulling rod or the like, an outwardly inclined end surface of an inner locking member integrally provided at a front end of the inner cylinder is integrally provided at a front end of the outer cylinder. The shield excavator can be easily and reliably removed and recovered to the starting shaft without dismantling the shield excavator while leaving the outer cylinder in the ground away from the outwardly inclined end face of the inner locking member.
[Brief description of the drawings]
FIG. 1 is a simplified longitudinal side view of the entire shield excavator,
FIG. 2 is a front view of the cutter head,
FIG. 3 is a simplified longitudinal rear view showing a gripper and a direction correcting jack portion in a rear trunk portion;
FIG. 4 is a cross-sectional view of a rolling prevention member,
FIG. 5 is a longitudinal side view thereof,
FIG. 6 is a simplified longitudinal side view showing a state in which a conduit is formed;
FIG. 7 is a simplified plan view showing a state where a front trunk is bent.
[Explanation of symbols]
A shield excavator
1 inner cylinder
1A, 1B Front and rear torso
2 outer cylinder
2A, 2B Front and rear torso
3, 4 Bent section
5 direction correction jack
7, 8 Internal / external locking member
9 Gripper
12 cutter head

Claims (3)

The shield excavator has an outer shell formed in a double structure of an outer cylinder and an inner cylinder, and after excavating a tunnel of a predetermined length by the shield excavator, the inner periphery of the outer cylinder is left in a state where the outer cylinder is left. In a shield excavator in which the inner cylinder provided with excavating means such as a cutter head using a surface as a guide is configured to be able to be removed rearward, the inner and outer cylinders each have a front and rear body portion via a bendable bent portion. And the front end facing surfaces of the front trunks of these inner and outer cylinders are slidably joined to each other, and furthermore, several places between the front and rear trunks of the inner cylinder are circumferentially oriented at predetermined intervals. The front and rear barrels of the inner and outer cylinders are simultaneously bent in the same direction from the respective bent portions by operating these direction correcting jacks. And shield excavator. At the front end of the outer cylinder, an outer locking member having an inwardly inclined end surface inclined obliquely forward toward the inside from the inner peripheral surface of the outer cylinder is integrally provided, while at the front end of the inner cylinder, An inner locking member having an outwardly inclined end surface inclined obliquely forward toward the inside from the outer peripheral surface side of the cylinder is integrally provided, and the outwardly inclined end surface of the inner locking member is set to the outer locking member. It is formed on the joint that is abutted and locked to the inwardly inclined end face from the rear side so that it can be disengaged and locked, and furthermore, it is possible to reduce the outer diameter of the cutter head until it becomes smaller than the inner diameter of the outer cylinder The shield excavator according to claim 1, wherein a gripper for detachably connecting the inner cylinder rear body and the outer cylinder rear body is mounted in the inner cylinder rear body. . The shielded excavator according to claim 1 or 2, wherein a front end of a drawing rod is connected to a rear trunk portion of the inner cylinder.

Images