JP4371603B2 - Semi shield excavator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an excavator used in a propulsion method for forming underground pipes by propelling buried pipes and sequentially laying them.
[0002]
[Prior art]
Conventionally, a semi-shield excavator is known as an excavator for excavation for constructing an underground conduit by a propulsion method.
[0003]
In order to build an underground pipe line to a reach shaft using this type of conventional semi-shielded excavator, the cutter device provided in front of the excavator body is rotated, and the propulsion device installed in the start shaft is used to The rear pipe of the excavator body is pressed to penetrate into the ground, and then the underground pipe is constructed by sequentially connecting and propelling the buried pipe to the excavator body.
[0004]
This conventional semi-shielded excavator is recovered from the reaching shaft after reaching the reaching shaft.
[0005]
However, the construction period for constructing this reach shaft is long, and the labor is also great. Therefore, there is a problem that the cost is increased. In addition, when a reaching shaft cannot be installed, there is a problem that it is unavoidable to take measures such as burying and killing an expensive excavator. In addition, there is a problem that it is impossible to recover the aircraft to the start shaft side once again, or to re-enter the aircraft into the underground conduit that has already been laid, such as when a ground condition that makes it difficult to dig .
[0006]
As another conventional technique, there is an excavator for excavation disclosed in JP-A-11-210375. As shown in FIG. 15 (a), the excavator for excavation 50 described in this publication includes cylindrical skin plates 51, 52 arranged in front and back, and excavation provided in these skin plates 51, 52. The machine main body 60 and a cutter arm 53 that is rotatably attached to a front portion of the machine main body 60 via a partition wall board 54 are configured. A plurality of rings 55, 56, and 57 are detachably attached to the inner surfaces of the skin plates 51 and 52. Further, the excavator main body 60 is configured to be disassembled into parts having a size that can be taken out through a manhole (reach shaft) except at least the cutter arm 53 and the partition board 54, and the excavator main body 60 includes the plurality of excavator main bodies 60. Removably attached to the rings 55, 56, and 57. In addition, a connection jack 58, 58 for connecting the front and rear skin plates 51, 52 includes a ring 56 attached to the rear end of the front skin plate 51 and a ring 57 attached to the front end of the rear skin plate 52. It is attached detachably so as to straddle.
[0007]
The recovery operation of the conventional excavator 50 configured as described above is performed as follows. That is, as shown in FIG. 15A, the tip of the excavating propulsion device 50 that has reached the manhole (reach shaft) 70 is fixed in a state of protruding into the manhole (reach shaft) 70. Next, as shown in FIG. 15 (b), the cutter arm 53 is fused to a size that can be recovered from the manhole (reach shaft) 70, and the excavator body 60 is disassembled. Then, the cutter arm 53, the gear box 61, the speed reducer 62, the electric motor 63, the discharge pipes 64 and 65, the connection jack 58, the gold cage 66, and the like are sequentially collected from the inside of the manhole (reach shaft) 70.
[0008]
According to this conventional excavator 50 for excavation, most of the airframe can be reused from the manhole (reach shaft) 70 without constructing a recovery shaft before the manhole (reach shaft) 70. Since it can be recovered, it is described in the publication that it has the advantage that the construction period can be shortened and the cost can be reduced.
[0009]
However, this conventional excavator for excavation 50 still requires a manhole (reach shaft) 70 to collect the fuselage, and has the same problems as the above-described conventional technology. Also, when recovering the airframe, the cutter arm must be blown out or disassembled as described above. On the other hand, when the airframe is reused, the cutter arm and airframe components must be removed. Since it must be assembled, there is a problem that it is troublesome and inefficient.
[0010]
As another prior art, there is a small-diameter propulsion device disclosed in Japanese Patent Laid-Open No. 2000-303779 that has already been proposed by the present applicant. As shown in FIG. 16, this conventional small-diameter propulsion device 100 has an outer cylinder 101 having an outer diameter substantially the same as the outer diameter of the buried pipe 150 and connected to the tip of the buried pipe 150, A rear cylinder 102b is inserted into the cylinder 101, and includes a front conduit 102 having a connection / separation mechanism 130, and a cutter head 105 rotatably attached to the front portion of the front conduit 102 and having an expansion / contraction mechanism 120. ing. The connection / separation mechanism 130 includes an engagement member 133 having an engagement groove 132 fixed to the inner periphery of the rear portion of the outer cylinder 101, and a propulsive force transmission that is attached to the rear portion of the rear barrel 102b and is expanded and contracted in the radial direction. Members 130a and 130b, and the thrust transmission members 130a and 130b are expanded in diameter and engaged with the engaging grooves 132 of the engaging member 133, whereby the outer cylinder 101 and the leading conduit 102 are connected. In addition, the outer cylinder 101 and the leading conduit 102 are configured to be free by reducing the diameter of the propulsive force transmission members 130a and 130b and releasing the engagement. In the expansion / contraction mechanism 120, a slide case 122 slidable in the tunnel axis direction is fitted to a shaft member 121 fixed to the center of the cutter head 105, and a link member 123 is interposed in the slide case 122. The disc cutter 124 is connected, and the disc cutter 124 is expanded and contracted by sliding the slide case 122 in the direction of the tunnel axis by the screw shaft 125.
[0011]
In the conventional small-diameter excavator 100 configured as described above, the expansion / contraction mechanism 120 expands the outer diameter of the cutter head 105 to be substantially the same as the outer diameter of the buried pipe 150, and The separation mechanism 130 connects the front conduit 102 and the outer tube 101, and imparts a propulsive force to the outer tube 101, so that the propulsive force is transmitted to the front conduit 102, and the embedded tube 150 is sequentially placed behind the outer tube 101. A predetermined number of buried pipes 150 are connected and laid. On the other hand, after the laying operation of the buried pipe 150 is completed, or when the laying work of the buried pipe 150 is interrupted and the leading conduit 102 is pulled back, the expansion / contraction mechanism 120 causes the outer diameter of the cutter head 105 to be changed to the inner diameter of the buried pipe 150. When the leading conduit 102 is retracted and the pulling force is applied to the leading conduit 102 after the coupling / separating mechanism 130 releases the coupling between the leading conduit 102 and the outer cylinder 101, the leading conduit 102 is Without interfering with the outer cylinder 101 and the buried pipe 150, the outer cylinder 101 and the buried pipe 150 are collected to the start shaft side. On the other hand, the leading conduit 102 in which the cutter head 105 is reduced in diameter is inserted into the outer cylinder 101 through the buried pipe 150 that has already been laid, and the leading conduit 102 and the outer cylinder 101 are coupled by the connecting / separating mechanism 130. At the same time, after expanding the diameter of the cutter head 105 by the expansion / contraction mechanism 120, if a propulsive force is applied to the tip conduit 102, the laying operation of the embedded pipe 150 can be performed again. The direction correction during the propulsion is performed by swinging the bent portion 104 provided at the connection portion between the front barrel 102a and the rear barrel 102b of the front conduit 102.
[0012]
According to this conventional small-diameter excavator 100, after the buried pipe 150 is laid, the leading conduit 102 can be easily recovered to the start shaft side by passing through the buried pipe 150 in a reusable state. In addition, there is an advantage that the first conduit 102 once collected on the start shaft side can be again put into the buried pipe 150 and easily re-excavated.
[0013]
[Problems to be solved by the invention]
However, the structure disclosed in Japanese Patent Laid-Open No. 2000-303779 has a larger diameter than a small-diameter propulsion machine, and is difficult to apply as it is to a semi-shielded excavator having a different structure. As one of the reasons, in the structure shown in Japanese Patent Laid-Open No. 2000-303779, the leading conduit 102 having the bent portion 104 is attached so as to protrude from the front end of the embedded tube 150. When there is a difference in the outer diameter with the buried pipe 150, a gap is formed between the cutter head 105 and the buried pipe 150 in the outer periphery of the main body of the tip conduit 102 with the natural ground, and the excavation diameter is small. This is because this gap, which is not so much of a problem, becomes a factor causing problems such as depression of natural ground as the diameter increases. If the bent portion 104 is not provided, the length of the aircraft is shortened, and the problems described above can be alleviated. However, in this case, the propulsion direction cannot be corrected. Furthermore, the leading conduit 102 shown in this Japanese Patent Laid-Open No. 2000-30779 is applicable only to a specific pipe diameter, and when a construction with a different pipe diameter occurs, a different size is set accordingly. There is a problem in that it is necessary to use the first conduit 102.
[0014]
The present invention has been made in view of such a problem, and can recover the airframe to the start shaft side in an easily and reusable state through the laid pipe without a reaching shaft. , Once recovered to the start shaft side, the aircraft can be re-introduced into the buried pipe for easy re-digging, and can be applied to different buried pipe diameters for accurate and smooth direction correction. The object is to provide a semi-shielded excavator that is made possible.
[0015]
[Means for solving the problems and actions / effects]
In order to achieve the above object, a semi-shielded excavator according to the first invention comprises:
A semi-shield excavator used in the propulsion method of forming underground pipes by propelling buried pipes and laying them in order,
An excavator body inserted in the buried pipe and disposed at the tip of the buried pipe, a cutter head supported on the front part of the excavator body and driven to rotate, and along the circumferential direction of the excavator body A plurality of gripper mechanisms arranged,
The cutter head has an expansion / contraction means for expanding the outer diameter so that the outer diameter is substantially the same as the outer diameter of the buried pipe, and reducing the outer diameter to be smaller than the inner diameter of the buried pipe, The gripper mechanism has a shoe that engages with the inner surface of the buried pipe, and the shoe is configured to be freely crimped / released to the inner surface of the buried pipe by the diameter expanding / reducing operation of the gripper mechanism. It is characterized by.
[0016]
According to the present invention, the cutter head is made approximately the same diameter as the outer diameter of the buried pipe by the expanding / contracting means, and the shoe is pressed against the inner surface of the buried pipe by the diameter expanding operation of the gripper mechanism. When the machine main body is fixed to the buried pipe and the buried pipe is propelled, excavation with the same diameter as the outer diameter of the buried pipe is carried out, and the laying work of the buried pipe is smooth. It is effective to be performed. The cutter head is made smaller in diameter than the inner diameter of the buried pipe by the expansion / contraction means, and the shoe is released from the inner surface of the buried pipe by the diameter reducing operation of each gripper mechanism, so that the excavator body is free. After that, when a pulling back force is applied to the excavator main body toward the start shaft side, the airframe is pulled back to the start shaft side through the buried pipe, so there is no need to construct a recovery shaft for the airframe, In addition, even if the underground shaft cannot be constructed due to circumstances of the laying location of the buried pipe, there is no underground shaft in the first place, even when it is joined to an existing structure, or even in the case of a ground condition that is difficult to dig The aircraft can be easily and reusably collected on the start shaft side, and the construction period can be shortened and the cost can be reduced. In addition, a pushing force opposite to the pullback force is applied to the machine body once collected on the start shaft side, and the machine body is arranged at a predetermined position at the tip of the buried pipe, and the cutter head is moved by the expansion / contraction means. The outer diameter of the buried pipe is approximately the same as that of the buried pipe, and the shoe is pressed against the inner surface of the buried pipe by the diameter expanding operation of each gripper mechanism, and the excavator body is fixed, so that the excavator body can be easily re-digged. be able to.
[0017]
According to the present invention, the cutter head can be expanded or contracted by the expansion / contraction means, and the excavator body is connected to the buried pipe via the shoe by the expansion / contraction operation of each gripper mechanism. Therefore, there is an effect that versatility that can be adapted to different buried pipe diameters can be obtained. Further, by controlling the diameter expansion / reduction operation of each gripper mechanism, the direction of the cutter head or the position in the diagonal direction is controlled via the excavator body, so that the correction of the excavation direction is possible. In addition, since the direction correction is performed by the cutter head that is arranged at the most advanced part during excavation, the responsiveness is good and an accurate and smooth direction correction can be achieved. In addition, after excavation by the cutter head, unnecessary gaps are not generated between the natural ground and the aircraft, so that problems such as depression of the natural ground are not caused. Furthermore, since the buried pipe is used as a body part (skin plate) of the excavator, the manufacturing cost of the machine body can be reduced.
[0018]
In the first invention, it is preferable that the excavator main body and the shoe have moving means for relatively moving along the axial direction of the buried pipe (second invention). In this way, when the shoe is crimped to the inner surface of the buried pipe by the diameter expanding operation of the gripper mechanism, the excavator body can be moved forward or backward with respect to the buried pipe by the moving means, In other words, the cutter head can be moved forward or backward with respect to the buried pipe. Therefore, when this excavator is used for joining to an existing structure or the like, the buried pipe can be pushed in until it comes into contact with the existing structure, and the joining can be easily performed. In the unlikely event that the propulsion direction cannot be smoothly corrected as described in the first aspect of the invention, as described above, the cutter head is controlled by controlling the diameter expansion / reduction operation of each gripper mechanism. By moving the cutter head forward and backward by the moving means and excavating in a desired direction in advance, and then making the buried pipe follow the excavated place. The direction can be corrected more easily and accurately. Further, when the cutter head is advanced by the moving means so that an opening is formed between the rear end of the cutter head and the tip of the buried pipe, the outer periphery of the cutter head It is possible to remove the excavation slip that tends to be removed through the opening, and it is possible to prevent the outer periphery of the cutter head from being worn. On the other hand, if the cutter head is moved backward by the moving means from this state and the gap between the rear end of the cutter head and the front end of the buried pipe is closed, it is possible to prevent the face from collapsing during a long-term stop.
[0019]
In the first invention or the second invention, the plurality of gripper mechanisms arranged in a plurality of groups are preferably composed of at least two groups capable of holding the excavator body in groups (third invention). . If it does in this way, the body can be moved by self-running along the axial direction of the buried pipe by cooperating with the movement means, while holding the excavator main body alternately in the group unit.
[0020]
In the third invention, the gripper mechanism relatively moves the support jack for pressing and releasing the shoe on the inner surface of the buried pipe, the excavator body and the shoe along the axial direction of the buried pipe. Preferably, the moving means is configured to relatively move the excavator body and the shoe by the cooperation of the support jack and the thrust jack (fourth). invention). In this case, after the cutter head is reduced in diameter so that the outer diameter of the cutter head is smaller than the inner diameter of the buried pipe, the support jack of the gripper mechanism in one of the groups is contracted. The gripper mechanism shoe and the buried pipe in this group are released from the crimping, and the support jack and the thrust jack of the gripper mechanism in this group are extended in synchronization to move the shoe backward. After that, the support jack can be extended to press the shoe against the inner surface of the buried pipe to hold the excavator body. Similarly, after the shoe of the gripper mechanism in the other group among the groups is moved rearward, the shoe can be pressed against the inner surface of the buried pipe to hold the excavator body. Next, the excavator body can be moved rearward by contracting the support jack and the thrust jack of the gripper mechanism in both groups while being synchronized. Therefore, by repeating such an operation, the airframe can be self-propelled and collected on the start shaft side. Further, in the self-propelled operation just described, if the movement direction of each shoe of each group is set to the front and the support jack and the thrust jack of the gripper mechanism in both groups are extended while being synchronized, It is also possible to run it and place it at the tip of the buried pipe.
[0021]
In the second invention, the excavator body has a main beam extending along the axial direction of the buried pipe, and a sliding frame that is slidable with respect to the main beam is provided on the main beam. A support jack and a parallel link, one end of which is attached to the sliding frame and crimped / released to the inner surface of the buried pipe, and the excavator body and the shoe are connected in the axial direction of the buried pipe. And the gripper mechanism is configured to include the support jack and the parallel link, and the moving means is configured to extend and retract the thrust jack. And the shoe are preferably moved relative to each other (fifth invention). In this way, the excavator body and the cutter head can be moved back and forth along the axial direction of the buried pipe by moving only the thrust jack without moving the thrust jack and the support jack in synchronization. The control of each jack can be made very easy and simple.
[0022]
In each of the above inventions, it is preferable that an expansion / contraction seal means for sealing between the outer periphery of the excavator body and the inner surface of the buried pipe is provided at the front portion of the excavator body (Sixth invention). ). In this way, the sealing means expands and contracts following the behavior of the excavator body, so that the space between the outer periphery of the excavator body and the inner surface of the buried pipe is reliably sealed and self-propelled. Even when the airframe is recovered by applying a pulling force or by applying a pulling force, the seal is not damaged. Moreover, according to this seal, since a certain amount of relative movement between the buried pipe and the excavator is allowed, the direction correcting operation by the above-described gripper mechanism becomes smooth.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Next, specific embodiments of the semi-shield excavator according to the present invention will be described with reference to the drawings.
[0024]
FIG. 1 shows a schematic cross-sectional view of a main part of a semi-shield excavator according to the first embodiment of the present invention. Further, FIG. 2 shows a view seen from the P direction in FIG.
[0025]
The semi-shield excavator 1 of the present embodiment is inserted into the buried pipe 15 and is supported by the excavator main body 2 disposed at the tip of the buried pipe 15 and the front part of the excavator main body 2 and is rotationally driven. And a cutter head 3 capable of expanding and contracting, and a plurality of grippers 31, 32, 41, 42 arranged along the circumferential direction to fix and hold the excavator body 2 in the buried pipe 15. (Corresponding to the gripper mechanism in the present invention) and disposed in a start shaft (not shown), propelling the buried pipe 15 and applying a propulsive force to the excavator main body 2 through the grippers 31, 32, 41, 42 And a propulsion device (not shown). Note that a steel pipe is used as the buried pipe 15.
[0026]
The excavator main body 2 has a substantially rectangular cylindrical cross section and extends rearward (rightward in FIG. 1) along the axis of the buried pipe 15, and is fixed to the front end portion of the main beam 4. A cutter head support 5 that rotatably supports the head 3 and a soil discharge device (not shown) that has a feeding / drainage pipe and discharges excavated earth and sand to the downstream side. Yes.
[0027]
Sealing means 6 is provided at the front portion of the excavator body 2, and the space between the outer periphery of the excavator body 2 and the inner surface of the buried pipe 15 is sealed to prevent inflow of water, earth and sand, etc. to the rear. Yes. That is, the cutter head support 5 is provided with a partition wall 7 for partitioning the interior of the buried pipe 15, and the seal member 9 is fixed to a cylindrical outer ring 8 fixed to the outer periphery of the partition wall 7. The gap between the outer ring 8 and the buried pipe 15 is sealed to prevent the inflow of water, earth and sand, etc. to the rear. Here, the seal member 9 employs a rubber tube-type water-stop seal that can be expanded and contracted, so that it can be reliably sealed following the behavior of the excavator body 2.
[0028]
The cutter head 3 has a substantially cross shape when viewed from the front, and a ring-like member (not shown) is fixed to the outer periphery of each cutter head spoke 3 d extending in the radial direction from the center portion, and is attached to the cutter head support 5. It is driven by a cutter head driving device (not shown) so that it can rotate with respect to the excavator body 2. A plurality of excavation blades 3c are provided on the front surface of the cutter head 3, and are used for excavation of natural ground. Further, an expansion / contraction mechanism 3a (corresponding to the expansion / contraction means of the present invention) for expanding / contracting the outer diameter of the cutter head 3 is provided on the outer peripheral portion of each cutter head spoke 3d. The expansion / contraction mechanism 3a includes an overcutter 3b for over-digging, and a jack (not shown) for driving the overcutter 3b. The overcutter 3b expands and contracts so that the overcutter 3b is connected to the outer periphery of the cutter head spoke 3d. It is comprised so that it may appear and disappear in the radial direction. In the cutter head 3, the diameter of the cutter head 3 is set to be substantially the same as the outer diameter of the buried pipe 15 in the expanded diameter state in which the over cutter 3b protrudes, and in the reduced diameter state in which the over cutter 3b is stored. The outer diameter is made smaller than the inner diameter of the buried pipe 15. Thus, by making the cutter head 3 in the expanded diameter state, excavation can be performed with a diameter substantially the same as the outer diameter of the buried pipe 15, and by making the cutter head 3 in a reduced diameter state, the cutter head 3 is The inside of the buried pipe 15 can be passed.
[0029]
The plurality of grippers 31, 32, 41, and 42 are attached to the rear of the main beam 4 so as to be substantially at the same position in the front-rear direction, which is the propulsion direction, and at equal intervals in the circumferential direction. ing. These grippers 31, 32, 41, 42 are grouped into a first gripper group 30 and a second gripper group 40 so that the entire semi-shield excavator 1 can be held against the buried pipe 15 in groups. Has been.
[0030]
The first gripper group 30 includes a gripper (hereinafter referred to as “upper gripper”) 31 disposed on the upper side of the main beam 4 in FIG. 2 and a lower side of the main beam 4 at a position symmetrical to the upper gripper 31. And a gripper 32 (hereinafter referred to as a “lower gripper”).
[0031]
The upper gripper 31 includes a shoe 33 having a curved surface that engages with the inner surface of the buried pipe 15, four support jacks 34 that mainly apply radial thrust to the shoe 33, and the shoe 33. It comprises two thrust jacks 35 that apply thrust in the front-rear direction, which is mainly the propulsion direction. In the upper gripper 31, the back surface of the shoe 33 and the rear portion of the main beam 4 are connected by the four support jacks 34 so as to form a parallel link mechanism. The two rows of support jacks 34 tilted to the right in FIG. 1 are arranged in parallel, and as shown in FIG. 2, the support jacks 34 are arranged in two rows as viewed from the rear. ing. Thus, the shoe 33 can be expanded and contracted in the radial direction, and the shoe 33 can be reciprocated in the front-rear direction (propulsion direction) with respect to the main beam 4.
[0032]
Further, the front end portion of the shoe 33 and the back surface of the partition wall 7 are connected by the two thrust jacks 35. These thrust jacks 35 are arranged in a substantially square shape in FIG. It is a lattice arrangement that crosses the direction extension line. Thus, the extension of the thrust jack 35 causes the shoe 33 to reciprocate in the front-rear direction (propulsion direction) with respect to the main beam 4 (excavator main body 2), and the reaction force of the excavation torque via the thrust jack 35. Is transmitted to the shoe 33 so that stable excavation work is performed.
[0033]
In the upper gripper 31, the shoe 33 is moved to the main beam by the synchronization of the support jacks 34 and the thrust jacks 35, that is, the operation of expanding and contracting the four support jacks 34 and the two thrust jacks 35 appropriately. 4 (excavator main body 2) can be moved back and forth (corresponding to the moving means in the present invention), the shoe 33 can be moved in the radial direction, and the shoe 33 can be crimped to and released from the inner surface of the buried tube 15. Has been.
[0034]
The lower gripper 32 has the same structure as the upper gripper 31 and is disposed below the main beam 4 at a position symmetrical to the upper gripper 31 as described above.
[0035]
The second gripper group 40 is arranged on the right side of the main beam 4 at a position symmetrical to the left gripper 41 and a gripper (hereinafter referred to as “left gripper”) 41 arranged on the left side of the main beam 4 in FIG. Gripper (hereinafter referred to as “right gripper”) 42.
[0036]
Each of the left gripper 41 and the right gripper 42 has a shoe 43 having a curved surface that engages with the inner surface of the buried tube 15 and four supports that mainly apply radial thrust to the shoe 43. A jack 44 and two thrust jacks 45 that mainly apply a thrust in the front-rear direction, which is a propulsion direction, to the shoe 43, and has the same structure as the upper gripper 31; The shoe 43 is moved back and forth with respect to the main beam 4 (excavator body 2) by appropriately synchronizing and extending the two thrust jacks 45 (corresponding to the moving means in the present invention), or the shoe. 43 is moved in the radial direction so that the shoe 43 can be crimped to and released from the inner surface of the buried tube 15.
[0037]
FIG. 3 is a view for explaining the forward / backward operation of the cutter head of the semi-shielded excavator according to the present embodiment. FIG. 4 is a diagram for explaining the swing operation of the cutter head, and FIG. 5 is a diagram for explaining the offset operation of the cutter head.
[0038]
In the semi-shielded excavator 1 of this embodiment, the extension of each jack so that the thrust jacks 35, 45 and the support jacks 34, 44 in the upper, lower, left, and right grippers 31, 32, 41, 42 move in synchronization with each other. For example, as shown in FIG. 3, each thrust jack 35 is held while the excavator main body 2 is held in the buried pipe 15 by the upper, lower, left, and right grippers 31, 32, 41, 42. , 45, the support jacks 34, 44 are expanded and contracted in synchronism with the expansion / contraction operation, whereby a forward / reverse operation for moving the cutter head 3 forward or backward is performed. By this forward / backward operation, the buried pipe 15 can be pushed in until the cutter head 3 is stopped just before the existing structure until it comes into contact with the existing structure, so that the joining can be easily performed. .
[0039]
Further, as shown in FIG. 4, the sealing means 6 is provided by extending and retracting the support jacks 34 and 44 while holding the excavator body 2 on the buried pipe 15 with the upper, lower, left and right grippers 31, 32, 41, 42. In order to allow the rear part of the main beam 4 to swing up and down and left and right diagonally with the front part of the excavator body 2 being supported as a fulcrum, Further, by extending and contracting the thrust jacks 35 and 45 so that the cutter head 3 and the buried pipe 15 do not interfere with each other, the cutter head 3 is swung vertically and horizontally around the center of the cutter head support 5 (this book In the embodiment, the swing angle θ is set to about 1 °.), And a swing operation is performed to turn the front surface of the cutter head 3 in a desired direction.
[0040]
Further, as shown in FIG. 5, the excavator main body 2 is held by the support jacks 34, 44 while the excavator main body 2 is held in the buried pipe 15 by the upper, lower, left, and right grippers 31, 32, 41, 42. Each thrust jack 35 is moved parallel to the axis of the buried pipe 15 to allow the excavator main body 2 to behave in accordance with the parallel movement operation, and so that the cutter head 3 and the buried pipe 15 do not interfere with each other. , 45 is expanded and contracted to move the axis of the cutter head 3 obliquely up, down, left and right with respect to the axis of the buried pipe 15 and to perform an offset operation to decenter the cutter head 3 in a desired direction. .
[0041]
In order to lay the buried pipe 15 using the semi-shielded excavator 1 configured as described above, first, the upper, lower, left and right grippers 31, 32, 41, 42 are reduced in diameter so as to be smaller than the inner diameter of the buried pipe 15. . Next, the semi-shield excavator 1 is inserted from the tip of the buried pipe 15 until the front surface of the cutter head 3 protrudes from the tip of the buried pipe 15 by a predetermined amount. Next, the cutter 3 is expanded by projecting the overcutter 3b until the outer diameter of the embedded tube 15 becomes substantially the same as the outer diameter of the embedded tube 15, and the upper, lower, left, and right grippers are expanded so as to crimp the inner surface of the embedded tube 15. The excavator body 2 is fixed and held on the buried pipe 15 by the grippers 31, 32, 41 and 42. Then, the cutter head 3 is rotated to excavate the natural ground, and the rear end portion of the buried pipe 15 is pressed by a propulsion device (not shown) installed in the start shaft, and the buried pipe 15 is Intrude into. In this way, excavation work is performed, and thereafter, new buried pipes are sequentially connected and the excavation work is repeated to lay a predetermined number of buried pipes. Note that during the excavation work, excavation sludge or the like excavated by the cutter head 3 is discharged to the downstream side by a soil removal device (not shown).
[0042]
During the excavation work, excavation is preferably performed such that an opening is formed between the rear end of the cutter head 3 and the front end of the buried pipe 15 by the forward / backward operation of the cutter head 3 described above. It is an aspect. In this way, excavation gap that tends to be in a compacted state at the outer periphery of the cutter head 3 can be discharged through the opening, and wear of the outer periphery of the cutter head 3 can be prevented. When the excavation work is stopped for a long period of time, the face can be prevented from collapsing by closing the opening.
[0043]
Further, when the excavation direction is corrected during the excavation work, the embedded pipe 15 is propelled with the cutter head 3 oriented in a desired direction by the above-described swinging operation of the cutter head 3. As a result, excavation is performed in the desired direction by the cutter head 3, the buried pipe 15 is guided in the excavation direction, and the subsequent buried pipe is also guided in that direction to correct the direction. Is called. Thus, since the direction correction is performed by swinging the cutter head 3 protruding from the tip of the embedded pipe 15, the responsiveness of the direction correction is good and the direction correction is smoothly performed.
[0044]
When smooth direction correction is difficult to perform with this direction correction method, the propulsion of the buried pipe 15 is temporarily stopped, and the cutter head 3 is swung in the desired direction by the swing operation of the cutter head 3 described above. In this way, the cutter head 3 is moved forward and backward to form a partial excavation path along a desired direction in front of the cutter head 3. Next, when the buried pipe 15 is propelled, the buried pipe 15 is guided into the partial excavation path and penetrated. Thereafter, the excavation direction is corrected by repeating this operation. In this way, a partial excavation path excavated in the desired excavation direction is formed, and the buried pipe is inserted into the partial excavation path to correct the direction, so that the direction can be corrected more reliably and smoothly. it can.
[0045]
As another direction correction method in the semi-shielded excavator 1, there is a method of propelling the cutter head 3 eccentrically in a desired direction by the offset operation of the cutter head 3 described above. According to this direction correction method, excavation is performed in the eccentric direction, and the buried pipe 15 connected to the semi-shielded excavator 1 is guided in the excavation direction, and the subsequent buried pipe follows. The direction is corrected by being guided in the direction. Since the direction correction is performed by decentering the cutter head 3 positioned at the head of the embedded tube 15 with respect to the axis of the embedded tube 15 in this manner, the direction correction method by the swing operation of the cutter head 3 described above is the same. In addition, the responsiveness of the direction correction is good and the direction correction is performed smoothly.
[0046]
In the case where it is difficult to smoothly correct the direction by another direction correction method, the propulsion of the buried pipe 15 is temporarily stopped, and the cutter head 3 is eccentric in a desired direction by the offset operation of the cutter head 3 described above. As described above, the cutter head 3 is moved forward and backward to form a partial excavation path along a desired direction in front of the cutter head 3. Next, when the buried pipe 15 is propelled, the buried pipe 15 is guided into the partial excavation path and penetrated. Thereafter, the excavation direction is corrected by repeating this operation. In this way, a partial excavation path excavated in the desired excavation direction is formed, and the direction correction is performed by inserting the buried pipe into the partial excavation path, so that the direction correction can be performed more reliably and smoothly. it can.
[0047]
When the laying operation of the buried pipe 15 is completed and the semishield excavator 1 is recovered to the start shaft side, or when the semi pipe excavator 1 is interrupted and the semi shield excavator 1 is recovered to the start shaft side The overcutter 3b protruding from the cutter head 3 is retracted toward the center in the radial direction so that the outer diameter of the cutter head 3 is smaller than the inner diameter of the buried pipe 15. Next, the upper, lower, left and right grippers 31, 32, 41, 42 are reduced in diameter to release the crimping with the buried pipe 15. Thereafter, when a pulling force is applied to the excavator body 2, the semi-shield excavator 1 is pulled back and collected at the start shaft.
[0048]
In the present embodiment, there is a self-propelled collection method in which the semi-shield excavator 1 is self-propelled and the semi-shield excavator 1 is collected at the start shaft other than the above-described collection method. Next, the collection method by this self-propelled will be described.
[0049]
The figure for demonstrating the self-propelled operation | movement of the semi shield excavator 1 of this embodiment is shown by FIG.
[0050]
First, (A) as shown in FIG. 6A, the outer cutter 3b protruding from the cutter head 3 is retracted toward the center in the radial direction so that the outer diameter of the cutter head 3 is smaller than the inner diameter of the buried pipe 15. Reduce so that. Next, (B) as shown in FIG. 6B, the right and left grippers 41, 42 are reduced in diameter, the pressure bonding between each shoe 43 and the embedded tube 15 is released, and the position of each shoe 43 is moved backward. Let After the movement, the shoes 43 of the left and right grippers 41 and 42 are again pressed against the inner surface of the buried pipe 15 to be crimped. Next, (C) as shown in FIG. 6C, the upper and lower grippers 31, 32 are reduced in diameter, and the pressure bonding between each shoe 33 and the buried tube 15 is released to move the position of each shoe 33 rearward. Let After the movement, the shoes 33 of the grippers 31 and 32 are again pressed against the inner surface of the buried pipe 15 to be crimped. (D) As shown in FIG. 6D, the excavator body 2 is moved rearward by the contraction operation of the thrust jacks 35 and 45. Thereafter, by repeating (B) to (D), the semi-shield excavator 1 is allowed to self-propel to the start shaft, and the semi-shield excavator 1 is recovered at the start shaft. In the self-running operation just described, if the direction of movement of the shoes 33 and 43 is the front, and the support jacks 34 and 44 and the thrust jacks 35 and 45 are extended while being synchronized, It can also be arranged at the tip of the buried pipe 15.
[0051]
When re-introducing the semi-shield excavator 1 recovered by each of the above-described recovery methods and restarting excavation, or when introducing the semi-shield excavator 1 into an already laid pipe and excavating Cuts the cutter head 3 and the upper, lower, left and right grippers 31, 32, 41, 42 and applies a pushing force to the excavator body 2, or allows the semishield excavator 1 to self-propell to perform semishield excavation. The machine 1 is arranged at a predetermined position of the tip of the buried pipe 15, and the upper, lower, left and right grippers 31, 32, 41, 42 are expanded in diameter, and the excavator body 2 is fixedly held on the buried pipe 15. Then, the laying operation can be performed again by propelling the buried pipe 15 with a propulsion device (not shown) arranged in the start shaft.
[0052]
According to the present embodiment, since the excavation with the diameter substantially the same as the outer diameter of the buried pipe 15 is performed by the cutter head 3, there is an effect that the buried pipe 15 can be smoothly promoted. Moreover, even if there is no reaching shaft, the semi-shield excavator 1 can be easily recovered to the start shaft side in a reusable state. Further, the cutter head 3 can be expanded and contracted by the expansion / contraction mechanism 3a, and the excavator body 2 is connected to the excavator main body 2 via the shoes 33, 43 by the expansion / contraction operation of the upper / lower / left / right grippers 31, 32, 41, 42. Since it is fixed to the buried pipe 15 or is in a free state, there is an effect that versatility that can adapt to different buried pipe diameters can be obtained. It should be noted that the change in diameter to such an extent that it cannot be followed even by the inflatable / shrinkable seal member 9 can be dealt with by modifying a few parts such as the partition wall 7 and the seal member 9. .
[0053]
Next, a second embodiment of the semi-shield excavator according to the present invention will be described with reference to the drawings. In the present embodiment, parts that are the same as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
[0054]
FIG. 7 shows a schematic cross-sectional configuration diagram of a main part of a semi-shield excavator according to the second embodiment of the present invention. Further, FIG. 8 shows a diagram viewed from the Q direction in FIG.
[0055]
The semi-shield excavator 1A of the present embodiment employs a main beam 4A that is shorter in the axial direction of the buried pipe 15 than the main beam 4 in the previous first embodiment. , 32A, 41A, 42A, the thrust jacks 35A, 45A are connected to the rear rear side of the shoes 33A, 43A from the partition wall 7 or the cutter head support 5, and only the left and right thrust jacks 45A are arranged in a lattice. Except for this, the configuration is the same as that of the first embodiment.
[0056]
According to the semi-shielded excavator 1A of the present embodiment configured as described above, it is possible to obtain the same operational effects as those of the first embodiment, and it is possible to shorten the length of the machine and achieve compactness. .
[0057]
Next, a third embodiment according to the present invention will be described. In the present embodiment, parts that are the same as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
[0058]
FIG. 9 shows a cross-sectional configuration diagram of a main part of a semi-shield excavator according to the third embodiment of the present invention. Also, FIG. 10 shows a view seen from the R direction in FIG.
[0059]
In the semi-shielded excavator 1B of the present embodiment, the cutter head support 5 in the excavator body 2B extends rearward (rightward in FIG. 9) along the axis of the buried pipe 15, and becomes shorter in the front-rear direction, which is the propulsion direction. A rectangular frame-like main beam 4B is provided with a sliding frame 22 similar to the main beam 4B and slightly larger, and a sliding plate 23 is interposed between the outer periphery of the main beam 4B and the sliding frame 22. The sliding frame 22 is inserted so as to be slidable with respect to the main beam 4B.
[0060]
A plurality of grippers 31B, 32B, 41B, and 42B are attached to the sliding frame 22, and these grippers 31B, 32B, 41B, and 42B are located at substantially the same position in the front-rear direction that is the propulsion direction. Further, they are arranged vertically and horizontally in FIG. 10 so as to be equally spaced in the circumferential direction.
[0061]
Among the plurality of grippers 31B, 32B, 41B, and 42B, the grippers 31B and 32B arranged above and below the sliding frame 22 each have a curved surface that engages with the inner surface of the embedded tube 15. The two support jacks 34B for applying a thrust in the radial direction to the shoe 33B, the two thrust jacks 35B for applying the thrust in the front-rear direction as the propulsion direction to the excavator body 2B, and the sliding frame 22 The four links 36 connected to the back surface of the shoe 33B from the left and right of the front part and the right and left of the rear part are provided.
[0062]
Of the plurality of grippers 31B, 32B, 41B, 42B, the grippers 41B, 42B arranged on the left and right sides of the sliding frame 22 have the same structure as the grippers 31B, 32B arranged above and below, respectively, and are embedded. A shoe 43B having a curved surface that engages with the inner surface of the pipe 15, two support jacks 44B that apply radial thrust to the shoe 43B, and a longitudinal direction that is a propulsion direction for the excavator body 2B Two thrust jacks 45B for imparting thrust, and four links 46 connected to the back of the shoe 43B from the left and right of the front portion and the left and right of the rear portion of the sliding frame 22, respectively. ing.
[0063]
The support jacks 34B and 44B are attached in a state where they are tilted slightly forward from the center of the shoes 33B and 43B from the rear end of the sliding frame. Thus, the shoes 33B and 43B are expanded and contracted in the radial direction by expansion and contraction of the support jacks 34B and 44B. The rear end portions of the shoes 33B and 43B and the back surface of the partition wall 7 are connected by the thrust jacks 35B and 45B. The thrust jacks 35B and 45B are connected to the support jacks 34B and 44B and the respective support jacks 34B and 44B. In FIG. 10, a substantially C-shaped arrangement is arranged so as to be located outside the links 36 and 46, in other words, a lattice arrangement that crosses the extension line in each expansion / contraction direction. Thus, while contributing to the shortening of the machine length, the reaction force of the excavation torque is transmitted to the shoes 33B and 43B via these thrust jacks 35B and 45B, so that stable excavation work is performed.
[0064]
In this way, the shoes 33B, 43B in the upper, lower, left and right grippers 31B, 32B, 41B, 42B are pressure-bonded to the inner surface of the buried pipe 15, and the excavator body 2B through the sliding frame 22 with these grippers 31B, 32B, 41B, 42B. When the thrust jacks 35B and 45B are stretched and contracted at the same time in a state where they are fixed and held in the buried pipe 15, the excavator body 2B is slid back and forth via the sliding frame 22 to move the cutter head 3 back and forth. Have been able to. Further, when performing the forward / backward movement operation, it is not necessary to synchronize the thrust jacks 35B, 45B and the support jacks 34B, 44B, and only the thrust jacks 35B, 45B are expanded and contracted, so that the excavator body 2B and the cutter head are expanded. Since 3 can be moved back and forth, simplification of control is achieved as compared with the first and second embodiments.
[0065]
Similarly to the first and second embodiments, the excavator body 2B is held in the buried pipe 15 by the upper, lower, left and right grippers 31B, 32B, 41B, and 42B, and the support jacks 34B and 44B are extended and retracted. By moving the excavator main body 2B in parallel with the axis of the buried pipe 15, the axis of the cutter head 3 is translated vertically and horizontally with respect to the axis of the buried pipe 15, and the cutter head 3 is moved in a desired direction. An offset operation for eccentricity can be performed.
[0066]
According to the semi-shielded excavator 1B of the present embodiment configured as described above, the direction correction method by the swinging motion of the cutter head 3 and the recovery by self-running that are possible in the first and second embodiments. Except that the method is not possible, it is possible to obtain the same operational effects as those of the first and second embodiments, and the support jacks 34B and 44B as compared with the first and second embodiments. In addition, the configuration of the control system of the thrust jacks 35B and 45B can be made very simple.
[0067]
In each of the above embodiments, each of the previous embodiments can be applied by applying a cutter head having another expansion / contraction mechanism or a cutter head having another expansion / contraction mechanism instead of the cutter head 3 having the expansion / contraction mechanism 3a described above. It is possible to obtain the same effect as the above. Hereinafter, a cutter head provided with these other expansion / contraction mechanisms and a cutter head provided with other expansion / contraction mechanisms will be described with reference to FIGS. 11 and 12. FIG. In addition, about the part which is common in each previous embodiment, the same code | symbol shall be attached | subjected to a figure, and the detailed description is abbreviate | omitted.
[0068]
FIG. 11 is an explanatory view of a cutter head provided with another expansion / contraction mechanism. The state diagram (a) in which the outer diameter of the cutter head is substantially the same as the outer diameter of the buried pipe and the cutter head are shown. A state diagram (b) in which the outer diameter is smaller than the inner diameter of the buried pipe is shown.
[0069]
The cutter head 3 ′ in the present embodiment has a plurality of (four) brackets 81 projecting from the tip of the cutter head shaft 80 supported by the cutter head support 5 at equal intervals along the circumferential direction. 81, the base end portion of the cutter head spoke 3'd is pivotally supported, and the back surface of each cutter head spoke 3'd and the cutter head shaft 80 are connected by a jack 82. The head spoke 3 ′ d is configured to swing around the pivot shaft 83 in the front-rear direction which is the propulsion direction.
[0070]
When the laying operation of the buried pipe 15 is performed in the cutter head 3 ′ configured as described above, as shown in FIG. The diameter is substantially the same as the outer diameter of the buried pipe 15. On the other hand, when the airframe is pulled back to the start shaft side, each of the cutter head spokes 3d ′ is contracted as shown in FIG. 11B by contracting each jack 82 from the state shown in FIG. Is inclined toward the cutter head shaft 80 so that the outer diameter of the cutter head 3 ′ is smaller than the inner diameter of the buried pipe 15. Further, in this cutter head 3 ′, it is possible to cope with buried pipes having different diameters by changing the tilt angle of the cutter head spoke 3d ′.
[0071]
FIG. 12 is an explanatory view of a cutter head provided with still another expansion / contraction mechanism. A state diagram (a) where the cutter head spoke is raised and a state diagram (b) where the cutter head spoke is folded are shown. Each is shown.
[0072]
The cutter head 3 ″ in the present embodiment includes a plurality of brackets 85 (four) projecting at equal intervals along the circumferential direction at the tip of the cutter head shaft 84 supported by the cutter head support 5, The cutter head spoke 3 "d and the cutter head spoke 3" d, which are pivotally mounted around the pivot shaft 86 in the front-rear direction, which is the propulsion direction, are pivotally supported on both side walls of the bracket 85. And a fixing member 87 for maintaining an upright state extending so as to extend in the radial direction.
[0073]
The bracket 85 has a U-shaped cross section, and in a state where the cutter head spoke 3 "d stands, the rear surface of the base end portion of the cutter head spoke 3" d abuts against the end wall 85a of the bracket 85, The cutter head spoke 3 "d is prevented from tilting backward from its standing state.
[0074]
The cutter head spoke 3 "d has a structure in which the length in the longitudinal direction is adjusted by inserting / removing the spacer 88. Thus, by adjusting the length of each cutter head spoke 3" d, the cutter head 3 "d" is adjusted. The outer diameter of “can be made substantially the same as the outer diameter of the buried pipe 15.
[0075]
The fixing member 87 is detachably attached so as to connect the back surface of the cutter head spoke 3 "d and the cutter head shaft 84 so that the cutter head spoke 3" d standing so as to extend in the radial direction does not tilt forward. It is attached freely.
[0076]
In the cutter head 3 "constructed as described above, when the laying operation of the buried pipe 15 is performed, each cutter head spoke 3" d stands up along the radial direction as shown in FIG. 12 (a). The standing state is maintained by the fixing member 87, and the length of each cutter head spoke 3 "d is adjusted by inserting and removing the spacer 88 so that the outer diameter of the cutter head 3" is the outer diameter of the buried pipe 15. And approximately the same diameter. On the other hand, when the airframe is pulled back to the start shaft side, as shown in FIG. 12B, the fixing member 87 is removed so that each cutter head spoke 3 "d is along the axial direction of the buried pipe 15. The cutter head 3 "is tilted forward and folded so that the cutter head 3" can pass through the buried pipe 15.
[0077]
In each of the above embodiments, the case where the buried pipe 15 is a steel pipe has been described. However, the present invention is not limited to this, and a fume pipe or other pipe may be used.
[0078]
Further, in each of the above embodiments, including the case where the buried pipe 15 is made of a steel pipe, the buried pipe 15 is made of reinforced concrete such as a fume pipe or a material that is relatively easily worn. As shown in FIG. 13, it is preferable to attach a ring-shaped protective metal fitting 89 that externally fits the distal end portion of the buried pipe 15. By doing so, the tip of the buried pipe 15 is protected by the protective fitting 89, and wear of the tip during propulsion can be reliably prevented.
[0079]
In each of the above-described embodiments, an example of adopting a muddy water system provided with a soil discharging means composed of a sending / sludge pipe as an excavation / soil discharging system is shown, but not limited thereto, a screw conveyor and a vacuum soil discharging means are provided. It is also possible to adopt the mud pressure system provided.
[0080]
As shown in FIGS. 14A and 14B, the semi-shielded excavator 1, 1A, 1B in each of the above embodiments has a wheel 91 rotatably provided, and the wheel 91 is pulled out in the radial direction. A plurality of guide devices 90 configured to be retractable are mounted, and the guide devices 90 are arranged at suitable positions for balancing the machine body, and the wheels 91 of the respective guide devices 90 are appropriately attached to the inner surface of the buried pipe 15. It is possible to facilitate the recovery of the aircraft by constructing it so as to support the aircraft. At this time, as for the arrangement of the guide device 90 in the circumferential direction, for example, as shown in FIG. 14 (a), the guide device can support the machine body by stretching a plurality of wheels 91 downward. 14 may be arranged, and as shown in FIG. 14 (b), the guide device 90 is arranged so that the machine body is always located at the substantially central portion of the embedded pipe 15 by being radially radiated by a plurality of wheels 91. You may do it. In the former case, the aircraft can be transported very smoothly in the horizontal shaft and the shaft shaft, and in the latter case, in the horizontal shaft, the shaft shaft and the shaft shaft. It can be recovered remarkably easily.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view of a main part of a semi-shielded excavator according to a first embodiment of the present invention.
FIG. 2 is a diagram viewed from a P direction in FIG.
FIG. 3 is a view for explaining the forward / backward operation of the cutter head of the semi-shielded excavator according to the first embodiment, and is a diagram (a) showing a standard state and an operation state diagram (b). is there.
FIGS. 4A and 4B are diagrams for explaining the swinging motion of the cutter head of the semi-shielded excavator according to the first embodiment. FIG. 4A is a diagram illustrating a standard state, and FIG. is there.
FIGS. 5A and 5B are diagrams for explaining the offset operation of the cutter head of the semi-shielded excavator according to the first embodiment, and are a diagram (a) showing a standard state and an operation state diagram (b). .
6A and 6B are diagrams for explaining a self-running operation of the semi-shielded excavator according to the first embodiment. FIG.
FIG. 7 is a schematic cross-sectional view of a main part of a semi-shielded excavator according to a second embodiment of the present invention, a side view (a) and a plan view (b).
FIG. 8 is a diagram viewed from the Q direction in FIG.
FIG. 9 is a schematic cross-sectional view of a main part of a semi-shielded excavator according to a third embodiment of the present invention.
FIG. 10 is a diagram viewed from the R direction in FIG. 9;
FIG. 11 is an explanatory view of a cutter head provided with another expansion / contraction mechanism. FIG. 11 (a) is a state diagram in which the outer diameter of the cutter head is substantially the same as the outer diameter of the buried pipe; FIG. 3 is a state diagram in which the diameter is smaller than the inner diameter of the buried pipe.
FIG. 12 is an explanatory view of a cutter head provided with still another expansion / contraction mechanism, a state diagram in which the cutter head spoke is raised (a) and a state diagram in which the cutter head spoke is folded (b). .
FIG. 13 is a state diagram in which a protective fitting is attached to the buried pipe.
FIGS. 14A and 14B are schematic views for explaining the arrangement of the guide devices in the circumferential direction.
FIG. 15 is a schematic configuration diagram (a) of a conventional propulsion excavator and a state diagram (b) of airframe recovery.
FIG. 16 is a longitudinal sectional view of a leading conduit of a conventional small bore propulsion device.
[Explanation of symbols]
1,1A, 1B Semi shield excavator
2,2A, 2B Excavator body
3,3'3 "cutter head
3a Scale mechanism
4,4A, 4B Main beam
6 Sealing means
9 Seal member
15 buried pipe
30, 30A first gripper group
31, 31A, 32B Upper gripper
32, 32A, 32B Lower gripper
33, 33A, 33B shoe
34, 34A, 34B Support jack
35, 35A, 35B Thrust jack
40, 40A second gripper group
41, 41A, 41B Left gripper
42, 42A, 42B Right gripper
43, 43A, 43B Shoe
44, 44A, 44B Support jack
45, 45A, 45B Thrust jack

Claims (6)

A semi-shield excavator used in the propulsion method of forming underground pipes by propelling buried pipes and laying them in order,
An excavator body inserted in the buried pipe and disposed at the tip of the buried pipe, a cutter head supported on the front part of the excavator body and driven to rotate, and along the circumferential direction of the excavator body A plurality of gripper mechanisms arranged,
The cutter head has an expansion / contraction means for expanding the outer diameter so that the outer diameter is substantially the same as the outer diameter of the buried pipe, and reducing the outer diameter to be smaller than the inner diameter of the buried pipe, The gripper mechanism has a shoe that engages with the inner surface of the buried pipe, and the shoe is configured to be freely crimped / released to the inner surface of the buried pipe by the diameter expanding / reducing operation of the gripper mechanism. A semi-shielded excavator. The semi-shield excavator according to claim 1, further comprising a moving unit that relatively moves the excavator body and the shoe along the axial direction of the buried pipe. The semi-shielded excavator according to claim 1 or 2, wherein the plurality of gripper mechanisms are arranged in at least two groups capable of holding the excavator body in groups. The gripper mechanism includes a support jack for crimping and releasing the shoe on the inner surface of the buried pipe, and a thrust jack for relatively moving the excavator body and the shoe along the axial direction of the buried pipe; The semi-shielded excavator according to claim 3, wherein the moving means moves the excavator body and the shoe relative to each other by the cooperation of the support jack and the thrust jack. The excavator main body has a main beam extending along the axial direction of the buried pipe, and a sliding frame that is slidable with respect to the main beam is attached to the main beam, and one end is A support jack and a parallel link attached to a sliding frame for pressing and releasing the shoe on the inner surface of the buried pipe, and the excavator body and the shoe are relatively moved along the axial direction of the buried pipe. And the gripper mechanism includes the support jack and the parallel link, and the moving means moves the excavator body and the shoe relative to each other by the expansion and contraction of the thrust jack. The semi-shielded excavator according to claim 2, wherein the excavator is moved. The semi-inflatable / shrinkable sealing means according to any one of claims 1 to 5, wherein a front-end portion of the excavator body is provided with an inflatable / shrinkable sealing means for sealing between an outer peripheral portion of the excavator body and an inner surface of the buried pipe. Shield excavator.

Images