JP3649530B2 - Vertical shaft shield machine and tunnel excavation method using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shaft shield machine that digs downward by a shield method, in particular, an intermediate support system in which a cutter is supported by a drive unit at an intermediate part between a radial center part and an outer peripheral part, and The present invention relates to a bulkhead type shaft shield excavator provided with a bulkhead that isolates the inside of a shield body from ambient water, and a tunnel excavation method using the same.
[0002]
[Prior art]
Examples of known techniques relating to a method for recovering an intermediate support type and bulkhead type shaft shield excavator that excavates downward by a shield construction method after completion of the shaft excavation include the following.
(1) JP-A-6-58075
In this known technique, after disassembling and collecting each component on the bulkhead, water is poured into the shaft to submerge the shield, and the cutter head part and its peripheral part are separated underwater using a remote control mechanism. The head part is lifted with a crane and recovered to the ground.
[0003]
(2) JP-A-6-185284
This known technique uses a cutter holding device to cut the inner periphery of the cutter from the outer periphery of the cutter, and then operates the hydraulic jack to lift the cutter drive unit including the inner periphery of the cutter and its upper equipment, and secure it below it. By placing the bottom slab concrete in the created space, recovery is performed without using an auxiliary method and with the inside of the shield maintained in the atmosphere.
[0004]
[Problems to be solved by the invention]
However, the following problems exist in the above known technique.
That is, in the prior art (1), since the inside of the shield is submerged, it is necessary for the worker to retreat from the inside of the shield to perform remote operation, and there is a problem that it is difficult to improve workability during the collection operation. .
Further, in the known technique (2), since concrete is placed and sealed against groundwater pressure, there is no problem as in the above (1), but waterproofing is performed only by the placed concrete. There has been a problem that it is difficult to improve the waterproof reliability by reducing the occurrence of so-called panel swelling, etc., in which concrete expands after placing.
[0005]
An object of the present invention is to provide a shaft shield excavator and a tunnel excavation method using the shaft shield excavator that can improve workability at the time of recovery work and can improve waterproof reliability against groundwater pressure after excavation machine recovery.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, a shield main body disposed in a shaft, a cutter provided below the shield main body for excavating a face in the shaft, and at least a part of the shield main body. A cutter drive unit that is provided and supports the cutter and drives the cutter; the shield body includes a partition that isolates the shield body from ambient water, and the cutter is in a radial direction of the cutter. In the shaft shield machine supported by the cutter drive unit in the middle part between the center part and the outer peripheral part, provided in a penetrating part that penetrates the cutter drive unit among the partition walls, the shaft shield machine of the shaft shield machine During the excavation work, the penetrating part is sealed and the penetrating part is permanently closed after the excavation work of the shaft shield machine is completed. And the cutter drive unit includes a rotation drive mechanism that generates a rotational force for rotating the cutter, and a plurality of support members respectively connected to an intermediate part of the cutter. A rotation transmission mechanism that transmits a rotational force from the cutter to the cutter, a vertical drive mechanism that moves at least a support member of the rotation transmission mechanism relative to the partition, and a case that houses at least a part of the rotation transmission mechanism; And the case is separable above and below the seal mechanism, so that at least a part of the cutter drive unit can be used after the excavation work of the shaft shield excavator is completed. A shaft shield excavator characterized in that it can be divided above and below the seal mechanism is provided.
That is, during the excavation work of the shaft, in the cutter drive unit disposed in the shield body in the shaft, the rotational force of the rotation mechanism is transmitted to the cutter via the rotation transmission mechanism connected to the cutter intermediate portion, thereby shielding the shield. A cutter provided below is rotated to excavate the face in the shaft. At this time, since the cutter driving unit is provided through a partition wall that isolates the inside of the shield body from the surrounding water, a sealing mechanism that seals the through portion of the partition wall is provided.
Then, after the excavation work for a predetermined distance is completed, the seal mechanism permanently blocks the penetrating portion, and further divides at least a part of the cutter driving unit above and below the seal mechanism. In order to make this possible, for example, the following structure is adopted.
In other words, the case that houses at least a part of the rotation transmission mechanism has, for example, a two-part structure of an upper part that houses the bearing and pinion and a lower part, and these are coupled by bolts. Thereby, by loosening the bolt, it is possible to easily divide it up and down above the seal mechanism, for example, at a position near the lower end of the bearing. Still further, for example, if a substantially annular cutter ring whose bottom end is fixed to the support member and the bearing are fixed by bolts, these can be easily divided into upper and lower parts by loosening and removing the bolts. Therefore, in this case, the entire cutter driving unit can be easily divided into upper and lower parts above the sealing mechanism.
Thereby, since it is possible to perform a recovery operation by the worker for each component member above the partition wall including a part of the relatively expensive cutter driving unit while preventing the intrusion of the surrounding water, it is necessary to submerge the inside of the shield. The workability is improved compared to the case, and the occurrence of swelling of the panel is reduced compared to the case where waterproofing is performed only by the placed concrete, so that the reliability of waterproofing against the groundwater pressure after recovery can be improved. it can.
[0007]
Preferably, in the shaft shield machine, the rotation drive mechanism is a motor that generates a rotational force; the rotation transmission mechanism includes the plurality of support members and a substantially lower end fixed to the plurality of support members. A ring-shaped cutter ring; a bearing whose lower end is fixed to the cutter ring; and a pinion that meshes with a gear provided on the bearing and is mounted on the motor; Is an upper / lower jack whose one end is fixed to the case; and the case can be divided into an upper part for housing the bearing and pinion and a lower part for housing at least the upper part of the support member. Thus, there is provided a shaft shield machine characterized in that the upper part and the lower part are connected to each other by bolting. .
[0008]
More preferably, in the shaft shield machine, there is provided a shaft shield machine characterized in that a bearing provided in the rotation transmission mechanism and the cutter ring are coupled to each other by bolting. .
[0009]
More preferably, in order to achieve the above object, in the tunnel excavation method including a step of recovering at least a part of the constituent members of the shaft shield machine from the shaft after completion of excavation work, The bolts connecting the upper part and the lower part are removed to divide them, and the bolts connecting the bearing and the cutter ring are removed to release these connections. A first procedure that separates the main portion that includes the upper portion and the bearing and is not positioned below the first portion and the lower portion that includes the lower portion and the cutter ring that is not positioned above the first portion, and the first procedure is separated. After separating the main part of the cutter driving part from the shield main body wall surrounding the main part, the main part of the cutter driving part is Ri tunneling method characterized by a second step of recovering outside pit is provided by raising.
That is, in the first procedure, the bolts connecting the upper and lower parts of the case and the bearing and cutter ring are removed to release these connections, and the cutter drive unit is not positioned below the release position. By separating the main part and the lower part that is not located above the release position, it is only necessary to remove the bolt, so that the parting work is much easier than when cutting or the like is required. be able to. In the second procedure, the main part separated in the first procedure is separated from the wall surface of the shield body surrounding the main part, and then lifted and recovered outside the shaft, so that it is equipped with a motor or the like and is the most expensive. The main part of a cutter drive unit can be collected. In addition, since the space between the cutter ring and the partition wall penetrating portion remaining below can be permanently closed while withstanding the face water pressure by the sealing mechanism, the remaining lower portion contributes as a seal of the partition wall, The cutter can be left as a shaft bottom structure.
[0010]
More preferably, the main part of the cutter driving unit recovered to the outside of the shaft by the tunnel excavation method, a horizontal shaft shield body arranged in the horizontal shaft, and a face in the horizontal shaft provided in the direction of the horizontal tunnel shield body It is mounted on a horizontal shaft shield machine equipped with a horizontal shaft cutter to be excavated, and the horizontal shaft cutter is driven by a horizontal shaft cutter drive unit including a main part of the mounted cutter drive unit, thereby excavating the horizontal shaft. A tunnel excavation method is provided.
Thereby, cost reduction can be aimed at by reusing the collect | recovered main part as a horizontal shaft cutter drive part.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. An embodiment of the present invention will be described with reference to FIGS. In this embodiment, after excavation of the shaft is completed using the shaft shield excavator, the excavation method is implemented in which the main part of the cutter drive unit is collected and diverted as a part of the cutter drive unit of the horizontal shaft shield machine. It is a form.
(1) Structure of shaft shield machine
FIG. 1 is a side sectional view showing the overall structure of the shaft shield machine 500 according to this embodiment.
In FIG. 1, the shaft shield machine 500 according to the present embodiment is entirely suspended from the upper portion of the shaft 508 via unillustrated suspension means (eg, wire, jack, etc.). A cylindrical shield main body 541 disposed in the main body 508, a cutter 501 provided below the shield main body 541, that is, the lowermost part of the vertical shaft shield machine 500, and excavating the face 507 in the vertical shaft 508, and most of the main shield body A cutter driving unit 502 that drives the cutter 501 provided at 541, and a shield jack 520 that is provided on the outer peripheral portion of the shield main body 541 and presses the shield main body 541 downward. The shield main body 541 is moved in the digging direction (downward in the figure). Provided in the shield propulsion unit 503 to be propelled and the shield body 541, A segment assembling portion 504 having an erector 521 for assembling a segment 505 that applies a reaction force for causing the jack jack 520 to exert a pressing force downward, and two earth and sand suctions for sucking and discharging mud and sand excavated by the cutter 501 It has piping 506-a and 506-b.
[0012]
The shield body 541 includes a partition wall 509 that isolates the inside of the shield body 541 from the surrounding water. The partition wall 509 separates the inside of the shaft 508 from the face 507. In addition, the erector 521 is attached to a constituent member 502 </ b> A corresponding to the outer wall portion of the cutter driving unit 502.
[0013]
One end of each of the earth and sand suction pipes 506-a and 506-b opens near the lower surface of the cutter spoke 501B to form suction ports 519-a and 519-b. Further, intermediate portions of the earth and sand suction pipes 506-a and 506-b are collected and bundled in the center shaft 522 near the center axis of the cutter 501, and are arranged so as to penetrate the vicinity of the center of the partition wall 509. A branch pipe 533-a and a branch pipe 533-b (not shown) are branched below the swivel joint 523. The branch pipes 533-a and 533-b include valves 534-a and A valve 534-b (not shown) is provided.
The mud discharged by these earth and sand suction pipes 506-a and 506-b is performed in the following water supply / drainage system.
That is, water is sent from a water tank (not shown) provided above the shaft 508 to the face 507 via the water pipe 516. At this time, the face 507 is 0.2 kgf / cm at the groundwater level. ² The vertical position of the water tank is determined so that the water pressure is increased. Mud water including excavated sediment from the face 507 is sucked into the sediment suction pipes 506-a and 506-b from the suction ports 519-a and 519-b provided at one end of the sediment suction pipes 506-a and 506-b. Is done. The other ends of the earth and sand suction pipes 506-a and 506-b are connected to the corresponding upper pipes 556-a and 556-b via the swivel joint 523, and are installed on the shaft 508 separately and independently. The three suction pumps (not shown) are connected. The swivel joint 523 is a kind of rotary joint, and smoothly guides muddy water from the earth and sand suction pipes 506-a and 50b rotating together with the cutter 501 to the upper pipes 556-a and 556-b fixed to the structure, respectively. It has a function. The muddy water sucked up by these suction pumps is treated by a muddy water treatment facility (not shown) provided on the vertical shaft 508 and then guided to the water tank, and is returned to the face 507 by the water supply pipe 516 again.
[0014]
The cutter 501 is provided with a cutter bit (not shown) on a cutter spoke 501B having a shape inclined downward toward the center in the radial direction. Further, the cutter 501 is suspended vertically by a cutter vertical jack 530 provided in the cutter driving unit 502 and is driven by the rotational force of the cutter driving motor 512. A side sectional view showing the detailed structure of the cutter driving unit 502 is shown in FIG.
2 and 1, the cutter 501 is intermediately supported by a plurality of, for example, six cutter arms 510 at an intermediate portion 501C between the central portion and the outer peripheral portion in the radial direction, and has one substantially annular cutter ring 540. It is attached to the bearing 513 via A gear 515 is cut on the outer peripheral side of the bearing 513, and a pinion 514 mounted on the cutter drive motor 512 is engaged with the gear 515. The cutter ring 540, the bearing 513, and the cutter drive motor 512 are installed on a cutter sliding member 511 (shown by a shaded portion in FIG. 2), and slide up and down by a cutter vertical jack 530.
Further, a groove 543 that engages with the protrusion 542 on the shield main body 541 side is cut in the outer peripheral portion of the cutter sliding member 511, and a reaction force due to the rotation of the cutter 501 is transmitted to the shield main body 541 (the groove that engages with the protrusion 542). 543 has a plurality of places on the entire circumference, for example, four places). Further, a cutter 501 rotating seal 532 for attaching a seal between the cutter ring 540 and the sliding member 511 is attached to the cutter arm 510 side of the cutter ring 540, and the outer periphery of the cutter sliding member 511 on the face 507 side. Is attached with a sliding member seal 531 for sealing between the cutter sliding member 511 and the wall surfaces 535 and 536 near the penetrating portion 537.
[0015]
The sliding member 511 has a structure that can be divided into an upper part 511U that accommodates the bearing 513 and the pinion 515 and a lower part 511L that accommodates at least the upper part of the cutter ring 540. The upper part 511U and the lower part 511L are divided into two parts. They are coupled to each other by bolts 549. Further, the cutter ring 540 and the bearing 513 are coupled by bolting with a bolt 554. That is, the cutter driving unit 502 can be easily divided into upper and lower parts above the sliding member seal 531.
[0016]
(2) Shaft excavation
Next, the excavation operation in the shaft shield excavator 500 having the above-described configuration will be described below.
As a force applied in the vertical direction with respect to the whole shaft shield machine 500, the whole is suspended from the upper part of the shaft 508 via a suspension means (not shown), and an upward suspension force is applied. Further, the water pressure corresponding to the shield cross-sectional area is applied upward. Moreover, the whole weight of the shaft shield machine 500 is applied downward. On the other hand, as the force applied to the vertical movement of the cutter 501, the donut-shaped horizontal cross-section integral hydraulic lifting force under the cutter sliding member 511 acts upward.
Therefore, first, in the vicinity of the ground surface where the upward hydraulic lifting force applied to the cutter 501 is small, the weight of the cutter 501 is reduced by the upward suspension force by the suspension means, and only a part of the own weight is added. Excavation is carried out downward while rotating the cutter 501 while adjusting the pressing force to the natural ground to be the optimum size for excavation. FIG. 1 shows a state in which the cutter 501 is at the upper limit position that is the uppermost position during such normal excavation, and excavation is performed downward from this position. At this time, since the cutter driving unit 502 is provided so as to penetrate the partition wall 509, the sealing of the penetrating portion 537 is performed by the sliding member seal 531.
In this way, while suspending the cutter 501 with the cutter upper and lower jacks 530, after excavating the distance of the cutter 501, the cutter 501 is lifted with the cutter upper and lower jacks 530, and the shield that suspends the shield by the amount dug by the cutter 501. The means is extended, and the shield body 541 is propelled by the entire weight.
Then, the segment 505 is assembled by the erector 521 when the shield body 541 is propelled for a predetermined distance.
[0017]
The above procedure is repeated for excavation, but the water pressure applied to the partition wall 509 from below increases as the underground water pressure increases as the excavation progresses, making it impossible to propel it downward due to the shield's own weight. At that time, propulsion by the shield jack 520 is performed.
That is, after excavating the distance that is the cutter 501, the cutter 501 is lifted by the cutter upper and lower jacks 530, and the shield main body 541 is propelled by the shield jack 520 that is dug down by the cutter 501. Similarly to the above, the segment 505 is assembled by the erector 521 when the shield body 541 is propelled for a predetermined distance.
[0018]
When the water pressure applied to the cutter 501 from below reaches a certain depth and becomes greater than the cutter's own weight, during excavation, (hydraulic lifting force)-(cutter's own weight) + (cutter's sliding resistance force) ) Excavation is performed by rotating the cutter 501 while pressing the cutter 501 against the front face of the face 507 with the cutter upper and lower jacks 530 with a thrust equal to + (optimum load). That is, since the hydraulic lifting force becomes larger than the cutter's own weight and the cutter floats, excavation is performed while pressing the cutter against the ground with the optimum load by the cutter upper / lower jack 530. Here, the optimum load is a load most suitable for the cutter 501 to excavate efficiently. At this time, the torque of the cutter 501 changes finely depending on the pressing force of the cutter 501 against the face 507 and the soiling condition, so the stroke amount of the cutter upper and lower jacks 530 is adjusted while watching the torque change as well as the change in the thrust of the cutter 501. . Thereby, the excavation load of the cutter 501 can be adjusted, and excavation can be performed in a state where the optimum thrust is always applied.
[0019]
(3) Recovery of the main part of the cutter drive
Next, the procedure of the collection operation in the shaft shield excavator 500 after completion of the predetermined shaft excavation operation, which is one of the main parts of the present embodiment, will be described.
When all the excavation operations described above are completed, the state shown in FIG. 1 is obtained. Then, the erector 521 and the shield jack 520 disposed near the outer periphery of the shield body 541 are removed. Then, the upper water supply pipe 516 is removed from the valve 544 (see FIG. 1). The state after the removal is shown in FIG.
[0020]
Next, a solidifying material is injected into the water supply pipe 516 through the valve 544, and a solidifying material is injected into the earth and sand suction pipe 506-a, b through the valves 534-a, b. This state is shown in FIG. As a result, the water supply pipe 516 and the earth and sand suction pipes 506-a and b are filled with the solidification material and solidified, and it is possible to prevent earth and sand, muddy water, and the like from below the partition 509 from flowing upward from the partition 509. . And after solidifying the earth and sand suction piping 506-a, b, the installation bolt (not shown) under the swivel joint 523 is removed.
[0021]
Next, the bolt 549 connecting the upper portion 511U and the lower portion 511L of the sliding member 511 is removed, and further the bolt 554 connecting the bearing 513 and the cutter ring 540 is removed. In this way, since it is only necessary to remove the bolt, it can be divided very easily. At this time, as shown in FIG. 5, the wall surface of the shield body 541 surrounding the outer periphery of the cutter upper / lower jack 530 and the cutter drive motor 512 is cut.
[0022]
Thereafter, a part of the cutter driving unit 502 (the cutter driving motor 512, the bearing 513, the pinion 514, the gear 515, the upper part 511U of the cutter sliding member 511, and the upper and lower jack jacks 530) above the dividing position is lifted up outside the shaft 508. To collect. As a result, the main part of the cutter drive unit 502, which is the most expensive, is collected, the cutter rotation seal 532 remaining below is contributed to the seal of the partition wall 509, and the lower cutter 501 is left as a shaft 508 bottom structure. Let Further, as described above, the swivel joint 523 from which the mounting bolt has already been removed is lifted and recovered outside the shaft 508. This procedure is shown in FIG.
[0023]
(4) Structure of horizontal shaft shield machine
Next, FIG. 7 is a longitudinal sectional view showing the structure of the horizontal shaft mud shield shield machine in which the main part of the cutter drive unit 502 of the shaft shield machine 500 collected in (3) above is diverted (described later). .
[0024]
In FIG. 7, the horizontal shaft shield machine 200 according to the present embodiment is, roughly speaking, a cylindrical shield body 241 disposed in a horizontal shaft (not shown), and the shield body 241 in the forward direction (in FIG. 7). (Left side), that is, the cutter 201 provided at the foremost portion of the horizontal shaft shield machine 200 and excavating the face in the horizontal shaft, the cutter drive unit 202 that is provided in the shield main body 241 and drives the cutter 201, and the shield main body 241 Provided with a shield jack 220 that pushes the shield body 241 forward, and is provided on the shield body 241 and pushes the shield jack 220 forward. The element for assembling the segment 205 that gives a reaction force to apply a force And a segment assembly 204 which includes a coater 221.
[0025]
The shield body 241 includes a partition wall 209 that isolates the inside of the shield body 241 from the surrounding water. In other words, the partition wall 209 separates the inside of the horizontal shaft and the face.
The horizontal shaft shield machine 200 includes a cutter chamber 244 provided on the back surface of the cutter 201, and a sediment suction pipe 206 that sucks the sediment excavated by the cutter 201 and discharges it as muddy water. A suction port 206 a provided at the front end portion of 206 is opened in the cutter chamber 244. In addition, a preliminary suction port 206b used when the suction port 206a is closed is provided above the suction port 206a in the cutter chamber 244. The rear end of the earth and sand suction pipe 206 is connected to a suction pump (not shown). The muddy water sucked up by the suction pump is finally processed by a muddy water treatment facility (not shown) provided outside the horizontal shaft, and then provided at the tip of the water supply pipe 216 via the water supply pipe 216. The water supply port 216a is returned to the cutter chamber 244 again.
[0026]
Further, the cutter 201 is supported by a cutter front / rear jack 230 provided in the cutter driving unit 202 so as to be movable back and forth, and is driven by the rotational force of the cutter driving motor 212. FIG. 8 is a longitudinal sectional view showing the detailed structure of such a cutter driving unit 202.
8 and 7, the cutter 201 is intermediately supported by a plurality of (for example, six) cutter arms 210 in an intermediate portion 201C between the central portion in the radial direction and the outer peripheral portion. Thereby, especially in the large diameter, the deflection of the cutter 201 is less likely to occur than the center shaft method supported at the cutter central portion and the outer periphery support method supported at the cutter outer peripheral portion, which is advantageous in terms of strength. The cutter 201 is attached to the bearing 213 via a substantially annular cutter ring 240. A gear 215 is cut on the outer peripheral side of the bearing 213, and a pinion 214 attached to the cutter drive motor 212 is engaged with the gear 215. The cutter ring 240, the bearing 213, and the cutter drive motor 212 are installed on a cutter sliding member 211 (shown by a shaded portion in FIG. 8), and slide back and forth by a cutter front and rear jack 230.
Further, a groove 243 that engages with the protrusion 242 on the shield body 241 side is cut in the outer peripheral portion of the cutter sliding member 211, and a reaction force due to the rotation of the cutter 201 is transmitted to the shield body 241 (a groove that engages with the protrusion 242. 243 is a plurality of places on the entire circumference, for example, 4 places). Further, a seal 232 for rotating the cutter 201 for sealing between the cutter ring 240 and the sliding member 211 is attached to the cutter arm 210 side of the cutter ring 240, and the face side of the cutter sliding member 211 (FIG. 8). A seal 231 that seals between the cutter sliding member 211 and the shield main body 241 is attached to the middle left).
(5) Drilling of the horizontal shaft
Next, the excavation operation in the horizontal tunnel shield machine 200 having the above-described configuration will be described below.
As a force applied in the front-rear direction (left-right direction in FIG. 7) with respect to the entire horizontal tunnel shield machine 200, the water pressure corresponding to the shield cross-sectional area is applied rearward. On the other hand, as the force applied for the forward and backward movement of the cutter 201, the water pressure corresponding to the donut-shaped vertical sectional area S (see FIG. 8) at the front of the cutter sliding member 211 acts backward.
Therefore, first, the cutter 201 is excavated forward while rotating the cutter 201 while adjusting the pressing force of the cutter 201 to the natural ground with the jack 230 before and after the cutter 201 so as to have an optimum magnitude for excavation. That is, excavation is performed by rotating the cutter 201 while pressing the cutter 201 against the front surface of the face with the jack 230 before and after the cutter with a thrust equal to (water pressure) + (sliding resistance of the cutter) + (optimum load). That is, excavation is performed while pressing the cutter against the natural ground with the optimum load with the jack 230 before and after the cutter. Here, the optimum load is a load most suitable for the cutter to excavate efficiently. At this time, since the torque of the cutter 201 changes finely depending on the pressing force of the cutter 201 against the face and the soiling condition, the stroke amount of the front and rear jacks 230 of the cutter is adjusted while watching the torque change as well as the change of the thrust of the cutter 201.
In this way, while the cutter 201 is moved forward by the cutter front and rear jack 230, after excavating the distance of the cutter 201, the cutter 201 is moved backward by the cutter front and rear jack 230, and the amount of the digging by the cutter 201 is increased by the shield jack 220. The shield body 241 is propelled.
Then, when the shield body 241 propels for a predetermined distance, the segment 205 is assembled by the erector 221.
Repeat the above procedure, and continue to dig.
In such a horizontal shaft shield machine 200, the cutter drive motor 212, the bearing 213, and the like are moved back and forth with respect to the partition wall 209 by the cutter front and rear jack 230 provided in the cutter drive unit 202, By excavating the cutter 201, the pressing force / attraction force of the front / rear jack 230 of the cutter can be freely changed according to the magnitude of the water pressure applied to the partition wall 209, the forward advance amount of the cutter 201 can be adjusted, and the pressing force of the cutter 201 can be adjusted. It is possible to easily and accurately control the thrust force most suitable for excavation on the face. In addition, when the cutter 201 is pressed too much against the face and the frictional force becomes large or the back-filled injection solution circulates toward the face, making the cutter 201 difficult to rotate, the cutter 201 is inserted into the partition wall by the front and rear jacks 230. By retreating with respect to 209, the cutter 201 can be easily returned to the normal rotation state.
In addition, as described above, the pressing force of the cutter 201 against the face can be controlled easily and with high accuracy by the front and rear jacks 230, so that the equipment torque of the cutter 201 can be reduced, and the excavation can be efficiently performed with the pressing force that matches the natural ground. effective.
[0027]
(6) Assembly of horizontal shaft shield machine
Next, the main part of the cutter driving unit 2 of the shaft shield excavator 500 recovered in the above (3), which is one of the main parts of the present embodiment, is diverted to the horizontal shaft shield having the structure of the above (4). The procedure for assembling the excavator 200 will be described with reference to FIGS.
The horizontal shaft shield machine 200 is first assembled in a vertical orientation, for example, in a factory. That is, first, as shown in FIG. 9, in the structure described in (4) above, a cylindrical shield body 241 is placed on the mount 250, and the shield jack 221 and A partition wall 209 having a penetrating portion 237, a suction port 206a and a preliminary suction port 206b for earth and sand suction pipes 206 (described later) provided in the partition wall 209, a water supply port 216a for a water supply pipe 216 (described later), a cutter slide A portion corresponding to the lower portion of the moving member 211, a cutter ring 240 housed in the portion, a cutter arm 210 fixed to the lower end of the cutter ring 240, and a cutter 201 intermediately supported by the cutter arm 210 It is attached.
[0028]
Thereafter, as shown in FIG. 10, most of the cutter drive unit 502 of the shaft shield machine 500 (cutter drive motor 512, bearing 513, pinion 514, gear 515, cutter sliding member 511) recovered in (3) above. The upper part 511U and the cutter upper and lower jacks 530) are hung down into the shield main body 241, and these are inserted into the penetration part 237 of the partition wall 209 and fixed as shown in FIG. In other words, the cutter drive motor 512, the bearing 513, the pinion 514, the gear 515, the upper part 511U of the cutter sliding member, and the cutter upper and lower jacks 530 of the shaft shield excavator 500 are respectively connected to the horizontal shaft shield excavator 200. The cutter drive motor 212, the bearing 213, the pinion 214, the gear 215, the upper part of the cutter sliding member 211, and the cutter up / down jack 230 are used as they are (see FIG. 8).
[0029]
Thereafter, the cutter arm 210 and the bearing 213 are fixed, and the upper and lower portions of the cutter sliding member are fixed. Further, the other components constituting the horizontal shield shield machine 200, that is, the erector 221 for assembling the segment, the suction port The earth and sand suction pipe 206 connected to 206a, the water supply pipe 216 connected to the water supply port 216a, etc. (see FIG. 7 and FIG. 8) are sequentially assembled to complete the horizontal tunnel shield machine 200. It is inserted and rotated laterally at a predetermined position, and the state shown in FIG.
In the above, all the recovered parts of the cutter driving unit 502, that is, the cutter driving motor 512, the bearing 513, the pinion 514, the gear 515, the upper part 511U of the cutter sliding member, and the cutter upper and lower jacks 530 are connected to the horizontal shaft. Although diverted to shield machine 200, it is not limited to this. That is, although not particularly illustrated, when applied to a horizontal shaft shield machine that does not perform back and forth movement with a cutter longitudinal jack, the cutter vertical jack 530 is removed in the factory, and the cutter drive motor 512, bearing 513, pinion 514, gear Only 515 and the upper part 511U of the cutter sliding member need only be suspended and diverted in the shield body 241.
[0030]
According to the present embodiment configured as described above, since the concrete can be easily placed on the outside of the partition wall 509, the sinking of the cutter 501 can be easily prevented. The blockage of 537 is permanently secured. Therefore, a worker can perform a recovery operation above the partition wall 509, thereby improving workability and improving waterproof reliability against groundwater pressure after recovery. At this time, since the heavy bulkhead 509 and the upper structure play the role of a steel frame, there is no concern about concrete swelling and the reliability can be further improved.
Further, even when the concrete is placed inside the partition wall 509 to further ensure waterproofing, water does not enter the partition wall 509, so that the waterproofing is performed only with the cast concrete. It is not necessary to use hard special concrete, and normal concrete is sufficient.
[0031]
In addition to this, there is an effect that the cutter driving unit 502 can be disassembled and recovered by a very simple method of removing the bolts 549 and 554.
[0032]
In addition, in the said embodiment, although the horizontal tunnel shield machine was assembled in the vertical direction in the factory, it is not restricted to this, For example, you may assemble on the spot. In this case, the same effect is obtained.
[0033]
【The invention's effect】
According to the present invention, an operator can perform a recovery operation on each component member above the partition wall including a part of the relatively expensive cutter driving unit while preventing the surrounding water from entering, so that the inside of the shield is submerged. Workability is improved compared to when it is necessary, and the occurrence of blistering is reduced compared to when waterproofing is performed using only the cast concrete, improving the waterproof reliability against groundwater pressure after recovery. can do.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing an overall structure of a shaft shield machine 500 according to an embodiment of the present invention.
2 is a side sectional view showing a detailed structure of a cutter driving unit shown in FIG.
FIG. 3 is a view showing a state where an erector, a shield jack, and a part of a water pipe are removed from the recovery work of the shaft shield machine shown in FIG. 1;
4 is a view showing a state in which a solidifying material is injected into the water supply pipe and the earth and sand suction pipe after the procedure shown in FIG. 3;
FIG. 5 is a view showing a state in which the cutter upper and lower jacks and the outer periphery of the cutter drive motor have been cut after the procedure shown in FIG. 4;
6 is a diagram showing a procedure for recovering most of the cutter drive unit and the swivel joint after the procedure shown in FIG. 5;
FIG. 7 is a longitudinal sectional view showing the overall structure of a horizontal shaft shield machine.
8 is a longitudinal sectional view showing a detailed structure of a cutter driving unit shown in FIG.
FIG. 9 is a longitudinal sectional view showing one of the procedures for assembling the horizontal shaft shield machine shown in FIG. 7;
10 is a longitudinal sectional view showing one of the procedures for assembling the horizontal shaft shield machine shown in FIG. 7. FIG.
11 is a longitudinal sectional view showing one of the procedures for assembling the horizontal shaft shield machine shown in FIG. 7. FIG.
[Explanation of symbols]
200 Horizontal tunnel shield machine
201 cutter
201C Middle part
202 Cutter drive unit
203 Shield Promotion Department
204 Segment Assembly Department
206 Sediment suction pipe
209 Bulkhead
210 Cutter arm
211 Cutter sliding member
212 Cutter drive motor
213 Bearing
214 Pinion
215 gear
216 water pipe
220 Shield Jack
221 Electa
230 Jack before and after the cutter
240 Cutter Ring
241 Shield body
244 Cutter chamber
245 Tail seal
500 shaft shield machine
501 cutter
501C Middle part
502 Cutter drive unit
503 Shield Promotion Department
504 Segment assembly
506a, b Sediment suction pipe
507 face
508 shaft
509 Bulkhead
510 Cutter arm
511 Cutter sliding member (case)
512 Cutter drive motor
513 Bearing
514 pinion
515 gear
516 water pipe
519-a, b inlet
520 Shield Jack
521 Electa
523 Swivel joint
530 Cutter upper and lower jacks
531 Seal for sliding member (seal mechanism)
533-a, b Branch pipe
534-a, b Valve
535 Wall near the penetration
536 Wall near the penetration
537 penetration
540 Cutter Ring
541 Shield body
549 volts
554 volts

Claims (5)

A shield main body disposed in the shaft, a cutter provided below the shield main body for excavating a face in the shaft, and a cutter for supporting at least a part of the shield main body and driving the cutter The shield body includes a partition that isolates the inside of the shield body from the surrounding water, and the cutter is disposed at an intermediate portion between a radial center portion and an outer peripheral portion of the cutter. In the shaft shield machine supported by the drive unit,
The partition is provided in a penetrating part that penetrates the cutter driving unit, and seals the penetrating part during the excavation work of the shaft shield excavator, and the penetrating part after the excavation work of the shaft shield excavator is completed. Having a sealing mechanism for permanently closing
The cutter drive unit includes a rotation drive mechanism that generates a rotation force for rotating the cutter, and a plurality of support members respectively connected to an intermediate portion of the cutter, and transmits the rotation force from the rotation drive mechanism to the cutter. A rotation transmission mechanism, a vertical drive mechanism that moves at least a support member of the rotation transmission mechanism relative to the partition wall, and a case that houses at least a part of the rotation transmission mechanism. However, since it can be divided above and below the seal mechanism, at least a part of the cutter drive unit is located above the seal mechanism after the excavation work of the shaft shield machine. Vertical shaft shield machine characterized by being configured to be severable below. 2. The shaft shield excavator according to claim 1, wherein the rotation drive mechanism is a motor that generates a rotational force; the rotation transmission mechanism is fixed to the plurality of support members and the plurality of support members near the lower ends. A substantially annular cutter ring, a bearing whose lower end is fixed to the cutter ring, and a pinion that meshes with a gear provided on the bearing and is attached to the motor; The mechanism is an upper and lower jack whose one end is fixed to the case; and the case can be divided into an upper part for accommodating the bearing and the pinion and a lower part for accommodating at least the upper part of the support member. A shaft shield tunneling machine characterized in that the upper part and the lower part are connected to each other by bolting. 3. The shaft shield machine according to claim 2, wherein the bearing provided in the rotation transmission mechanism and the cutter ring are coupled to each other by bolting. In a tunnel excavation method including a step of recovering at least a part of the constituent members of the shaft shield machine according to claim 3 to the outside of the shaft after excavation work of the shaft,
After the excavation work of the shaft is completed, the bolts that connect the upper part and the lower part of the case are removed and divided, and the bolts that connect the bearing and the cutter ring are removed. And the cutter driving part is separated into a main part that includes the upper part and the bearing and is not positioned below, and a lower part that includes the lower part and the cutter ring and is not positioned above the first part. Procedure and
The second procedure of separating the main part of the cutter driving part separated in the first procedure from the wall surface of the shield body surrounding the main part and then lifting the main part of the cutter driving part and collecting it outside the shaft. When,
A tunnel excavation method characterized by comprising: The main part of the cutter drive part recovered to the outside of the shaft by the tunnel excavation method according to claim 4, a horizontal shaft shield body arranged in the horizontal shaft, and a face in the horizontal shaft provided in the direction of the horizontal tunnel shield body It is attached to a horizontal shaft shield machine equipped with a horizontal shaft cutter to be excavated, and the horizontal shaft cutter is driven by a horizontal shaft cutter drive unit including a main part of the mounted cutter drive unit, thereby excavating the horizontal shaft. A tunnel excavation method characterized by performing.

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