JP3311324B2 - Bifurcated start method of double shield type shield machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of branching and starting a double shielded shield machine, and in particular, separates each shield machine sequentially from a spacer sandwiched between a plurality of shield machines and allows the shield machine to independently excavate. It relates to a branch start method.

[0002]

2. Description of the Related Art Conventionally, when two tunnels adjacent to each other vertically or horizontally are excavated by a shield method, for example, as described in Japanese Patent No. 2895057, usually two tunnels are excavated.
In many cases, a double shield excavator in which shield excavators of the machine are arranged vertically or horizontally is used.

In Japanese Patent No. 2895057, a connecting mechanism is provided for connecting the trunk members of adjacent shield machines via spacers and connecting pins, and a through-hole is formed in the connecting pin of the connecting mechanism to form a shield excavator. A shielded excavator in which at least one of an electric cable and a hydraulic passage forming body included in a drive control system for the same is arranged via the through hole is described. In this double-shielded excavator, when disconnecting the connecting pin from the spacer on the front side of the trunk member, first remove the nut member from the connecting pin, pull out the connecting pin, and form a communication hole communicating with both shield excavating machines. I do. Next, after closing the communication holes from the inside of each shield machine, respectively, the fixing of the spacer by the plurality of bolts is released.

[0004] In the case of using this type of multiple shield excavator to excavate a sewer, for example, from the downstream side to the upstream side, the excavation is interrupted during the excavation, and each shield excavator is sequentially separated to start branching. Let it. When a subway is shield-excavated, for example, a plurality of shield excavators are connected in parallel at a station and excavated, and at a portion other than the station, each shield excavator is separated and branched and started.

[0005]

[Problems to be Solved by the Invention] Japanese Patent No. 289505
In the double-shielded machine of No. 7, in the preparation stage of branch excavation, although the fixed relationship between each shield machine and the spacer is released, a gap is formed between the shield machine and the spacer to separate them. No such method is specifically described. If the shield excavator is to be branched and started independently without forming this gap, a large frictional force acts between the shield excavator and the spacer, and the vehicle cannot be started smoothly or cannot be started in a desired excavation direction. . In addition, the body member is greatly damaged. After each shield excavator branches and starts, the spacer will remain in the ground, but it is necessary to form a gap between the shield excavator and the spacer that finally branches off and separate and then start branching. The spacer is driven by the shield machine, and the shape of the tunnel may be lost or the vehicle may not be able to start in the desired machine direction. SUMMARY OF THE INVENTION An object of the present invention is to form a gap between a spacer of a coupling mechanism that connects adjacent shield excavators and a shield excavator while maintaining water-blocking, and to enable separation of a double-shielded excavator. It is to provide a starting method.

[0006]

According to a first aspect of the present invention, there is provided a method for branching and starting a double-shielded machine, comprising: a spacer sandwiched between a plurality of shield machines; a connecting pin for inserting the spacer; The tunnel is excavated by a multiple shield excavator that connects a plurality of shield excavators in parallel by a coupling mechanism with a pedestal that supports the end of the connection pin with A step of removing a connecting pin of each connecting mechanism and communicating a connecting pin hole extending between a pair of pedestals and a spacer, and connecting the spacer to each other. A reaction force seat that closes the pin hole
And welded to spacer, along with assembling the jack means pair from both sides of the connection pin hole in the opposite form these 1
A second step of sealing both end portions of the connection pin hole in a watertight manner by a pair of jack means, and a reaction force receiving seat by one jack means in a shield machine on one side of the spacer.
How to isolate the spacer from the one side shield machine
A third step of separating the shield excavator on one side from the spacer by pressing the shield excavator on the one side, and a fourth step of branching and starting the shield excavator on the one side.

In a state in which a plurality of shield excavators are connected in parallel by a connection mechanism, these shield excavators can be integrally shielded and excavated in a plurality of adjacent tunnels in parallel. When switching each shield excavator to a single excavation, the excavation is interrupted when the branch excavation point is reached, and a plurality of shield excavators are sequentially branched and started in the first to fourth steps. In the first step, the connecting pin of each connecting mechanism is removed to connect the connecting pin hole, and in the next second step, the connecting pin hole of the spacer is removed.
Reaction force seat is welded to the spacer, only assembling a pair of jacking means from both sides of the connecting pin hole, these jacks hand closing
Because sealing the end portions of the consolidated pin holes in a watertight manner by the step,
Water and earth and sand can be prevented from entering each shield machine from the connection pin hole.

[0008] In the third step, to one of the jack means
The spacer on one side of the spacer through the reaction force receiving seat
Press toward isolating the excavator, whereas the side of the shield machine is separated from the spacer, then Ru one side of the shield machine is branched start smoothly to a desired excavation direction in the fourth step. Since the vehicle starts to branch off from the spacer, a large frictional force does not act between the spacer and the spacer, and the trunk member is not damaged.

According to a second aspect of the present invention, there is provided the branching and starting method for a double-type shield excavator according to the first aspect of the present invention, further comprising the other jack means in the shield excavator on the other side of the spacer.
Seal the spacer on the other side through the reaction force receiving seat
A fifth step of separating the shield machine from the spacer by pushing the shield machine away from the excavator, and a sixth step of branching and starting the shield machine on the other side. Things. In the fifth step, the spacer is moved forward through the reaction force receiving seat by the other jack means.
Pressing away from the shield machine on the other side separates the shield machine on the other side from the spacer,
The other side of the shield machine Ru branches start smoothly to a desired excavation direction in the sixth step. At this time, the spacer remains in the ground.

According to a third aspect of the present invention, there is provided the method of the second aspect, wherein the multiple-type shield excavator includes a pair of shield excavators including a front coupling mechanism and a rear coupling mechanism. And the excavator is connected with the By connecting a pair of shield machines with a front connection mechanism and a rear connection mechanism, two tunnels can be dug in parallel. Hereinafter, by performing the first to sixth steps sequentially, each shield machine can be branched and started.

[0011] branch starting method of the double continuous type shield machine according to claim 4 is the invention according to claim 2 or 3, Te second step smell, spacer reaction force seat for closing the connecting pin hole of the spacer And jack bolts are respectively used as the two jack means, and the tips of both jack bolts are brought into contact with a reaction force receiving seat. When the reaction bolt is welded to the spacer and the jack bolt of one of the jack means is pushed in from the inside of the shield excavator by a predetermined stroke in the subsequent third step, the shield excavator on the one side receives the spacer. Separated by a predetermined stroke.

According to a fifth aspect of the present invention, there is provided the method of the fourth aspect, wherein the tip of the jack bolt of one jack means is provided after the third step and before the fourth step. The jack bolt is spaced apart from the reaction force receiving seat, and the base end portion of the jack bolt is welded to one of the pedestals in a watertight manner. Therefore, the shield excavator on one side can be smoothly branched and started in a desired excavation direction, and the water stopping performance of the shield excavator can be kept high.

According to a sixth aspect of the present invention, in the method of the fourth aspect, after the fifth step and before the sixth step, the tip portion of the jack bolt of the other jack means is changed. The jack bolt is separated from the reaction force seat, and the base end portion of the jack bolt is welded to the other pedestal in a watertight manner. Therefore, the shield excavator on the other side can be smoothly branched and started in a desired excavation direction, and the water stopping performance of the shield excavator can be kept high.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. This embodiment is an example of a case where the present invention is applied to a double shield excavator in which two muddy shield excavators are vertically arranged. However, the following description includes the description of the branch excavation method of the double shield excavator. Note that the front, rear, left and right in the excavation direction will be described as front, rear, left and right. As shown in FIG.
The continuous shield excavator 1 comprises a first shield excavator 2 and a second shield excavator 3 which are vertically arranged side by side. These first and second shield excavators 2 and 3 can be separated by a coupling mechanism 4. It is connected to.

First, the first shield machine 2 will be described. As shown in FIG. 1, the first shield machine 2
Cutter head 5, body member 6, head rotation support mechanism 7,
It has a head rotation driving mechanism 8, a plurality of shield jacks 9, a plurality of center-folding jacks 10, an erector device 11, a feeding and discharging equipment 12, and the like. The body member 6 has a front body 13 and a rear body 15 connected to the front body 13 through a bent part 14, and a main body frame 17 including a partition wall 16 is joined to a front end portion of the front body 13. Have been. Excavated soil excavated by the cutter head 5 is collected in a chamber 18 surrounded by the partition wall 16, the front body 13, and the cutter head 5.
The tip of the water supply pipe of the sludge discharge facility 12 reaches the upper end of the chamber, and the tip of the sludge pipe of the sludge discharge facility 12 reaches the lower end of the chamber 18.

The head rotation support mechanism 7 will be described. The head rotation support mechanism 7 has a ring member 19 fixed near the outer peripheral portion of the rear surface of the cutter head 5, and the ring member 19 is attached to the main body frame 17 via a bearing. It is rotatably supported. The partition 16 is provided with a swivel joint 20 for supplying hydraulic pressure to a hydraulic cylinder or the like of the cutter head 5. Note that a tail grout seal 21 is provided at the rear end of the rear trunk 15.

The head rotation drive mechanism 8 will be described. The head rotation drive mechanism 8 has a plurality of hydraulic motors 23 fixed to a ring-shaped member 22 of the main body frame 17 and is fixed to an output portion of each of these hydraulic motors 23. The plurality of pinion gears are meshed with a ring gear 24 fixed to the rear end of the ring member 19. The shield jack 9 will be described. A ring frame 25 is fixed to the inner surface of the rear end of the center bent portion 14, and a plurality of shield jacks 9 are arranged on the ring frame 25 at appropriate circumferential intervals and are arranged rearward. It is fixed toward. A spreader is pin-connected to the distal end of the rod of each shield jack 9 via an eccentric fitting, and the spreader pushes the front end of the segment S backward, whereby the thrust of the first shield excavator 2 is obtained.

The erector device 11 will be described. The erector device 11 comprises a rotating frame 26 rotatably supported by a rear body 15 via a plurality of rotating supports, and a plurality of rotating frames 26 for rotating the rotating frame 26. A hydraulic motor 27,
It has an erector main body 28 mounted on the rotating frame 26 and the like. In addition, both ends of each half-folded jack 10 are connected to the main body frame 17 and the ring frame 25.

Next, the second shield machine 3 will be described. However, the second shield machine 3 has a structure substantially similar to that of the first shield machine 2 and will be described briefly.
As shown in FIG. 1, the second shield machine 3 includes a cutter head 30, a body member 31, a head rotation support mechanism 32, a head rotation drive mechanism 33, a plurality of shield jacks 34,
It has a plurality of half-folded jacks 35, an erecta device 36, a feeding and discharging equipment 37, and the like. The cutter head 30 is arranged so as to be shifted slightly rearward from the cutter head 5 of the first shield excavator 2 when the shield excavators 2 and 3 are connected.

The body member 31 includes a front body 38 and the front body 38.
And a main body frame 41 including a partition wall 40 is joined to a front end portion of the front body 38. The upper end and lower end of the chamber reach the water supply pipe of the sludge feed / drainage equipment 37 and the end of the sludge pipe.
The head rotation support mechanism 32 includes a ring member 42, and the ring member 42 is connected to the main body frame 41 via a bearing.
It is supported rotatably. Head rotation drive mechanism 33
Has a plurality of hydraulic motors, and a plurality of pinion gears respectively fixed to the output portions of these hydraulic motors are meshed with a ring gear.

A plurality of shield jacks 34 are disposed on the ring frame 43 at appropriate intervals in the circumferential direction and fixed rearward, and a spreader is attached to the tip of the rod of each shield jack 34 via an eccentric fitting. Pin-connected. The erector device 36 includes a rotating frame rotatably supported on the rear trunk 39 via a plurality of rotating supports, a plurality of hydraulic motors, an erector body, and the like.

Next, the connecting mechanism 4 will be described. FIG.
As shown in FIG. 3, the connecting mechanism 4 includes a front connecting mechanism 50 and a rear connecting mechanism 51, and as shown in FIG. ,
38, and the rear trunks 15, 39 of the shield excavators 2, 3 are coupled to each other by a rear coupling mechanism 51.

The front connection mechanism 50 will be described. As shown in FIGS. 2, 4 and 5, the front connection mechanism 50 includes a spacer 52, a connection pin 53, and pedestals 54 and 55. The spacer 52 includes a first spacer 52a on the first shield machine 2 side and a second spacer 52b on the second shield machine 3 side, and these first and second spacers 52a, 52
2b are sandwiched between the shield machines 2 and 3 which are opposed to each other with the flat portions facing each other and are provided from the front end portions of the front trunks 13 and 38 to the rear end portions. . The connecting pin 53 includes first and second spacers 52a and 52b.
The pedestals 54 and 55 are connected to the nut members 5 in the front body 13 by connecting the distal ends of the connecting pins 53 inserted from the inside of the front body 38.
6 and the lock nut 57 can be fastened and supported.

The concave curved surface 58 on the upper side of the first spacer 52a and the concave curved surface 59 on the lower side of the second spacer 52b abut on the outer peripheral surfaces of the front barrels 13 and 38, respectively. The left and right ends of the two spacers 52a, 52b are releasably fastened from the inside of the front bodies 13, 38 by a plurality of upper, lower, left and right bolts 60, respectively.

In the vicinity of the outer ends of the concave curved surfaces 58, 59 of the first and second spacers 52a, 52b, annular grooves are formed outside the left and right bolts 60, respectively. 61 and 62 are mounted. Annular grooves are also formed near the inner ends of the concave curved surfaces 58, 59, and seal members 63, 64 are mounted in the respective annular grooves. First
Sliding seal members 65 and 66 are also provided on the side of the spacer 52a that is in contact with the second spacer 52b.

As shown in FIG. 2, FIG. 4 and FIG.
The front end face is formed into a ring-shaped member 22 at the lower end portion of the inner surface of the front body and the upper end portion of the inner surface of the front body 38 (the shield excavator 3 side is not shown).
The pedestals 54 and 55 are welded and joined, respectively, and the pedestal 54 is formed with a long hole 54a having a long axis in the left-right direction and a short axis in the front-rear direction. A member 56 is provided so as to cover the elongated hole 54a. Pedestal 55
Is formed with a hole 55a into which the connecting pin 53 can be inserted.
When the connecting pin 53 is removed from the front connecting mechanism 50, the connecting pin hole 67 communicates with the pair of pedestals 54, 55 and the spacer 52.

Next, the rear connecting mechanism 51 will be described. As shown in FIGS. 3 and 6, the rear connecting mechanism 51 includes a spacer 70, a pair of left and right connecting pins 71, and a pair of upper and lower pedestals 7.
2 is provided. The spacer 70 is sandwiched between the shield machines 2 and 3 that are brought close to each other, and is provided over substantially the entire length from the front end to the rear end of the rear trunks 15 and 39. The pair of connecting pins 71 pass through the spacer 70, and the pair of pedestals 72 can connect and support the distal ends of the pair of connecting pins 71 inserted from the inside of the rear body 15 by the flange member 73 in the rear body 39. It is. By the way, a pair of connecting pins 71
In the through hole of the left connecting pin 71, a connection oil passage 74 included in the drive control system is provided, and in the through hole of the right connection pin 71, the through hole is provided for the drive control system. An included electrical cable 75 is provided.

The upper concave curved surface and the lower concave curved surface of the spacer 70 are formed so as to abut along the outer peripheral surfaces of the rear trunks 15 and 39, respectively. Bolts can be fastened from inside the rear bodies 15, 39, respectively. When the connecting mechanism 51 is connected, blind plugs 76 are attached from inside the rear trunks 15 and 39, respectively. Note that reference numerals 77 to 82 indicate seal members.

As shown in FIGS. 3 and 6, a vertically symmetrical pedestal 72 having a front end surface in contact with the ring frames 25 and 43 is provided at the lower end portion on the inner surface of the rear trunk 15 and the upper end portion on the inner surface of the rear trunk 39.
Are welded, respectively, and a pair of left and right vertical connecting pin holes 83 formed over the rear trunks 15 and 39, the spacer 70, and the pair of pedestals 72 are provided with a pair of coupling pins 71 of the rear trunk 15. The pair of connecting pins 71 are inserted from the inside, and the distal ends of the pair of connecting pins 71 can be connected and supported in the rear body 39 by the flange member 73. When the pair of connecting pins 71 are removed from the rear connecting mechanism 51, the connecting pin holes 83 communicate with the pair of pedestals 72 and the spacer 70.

Next, a jack mechanism for separating the shield machines 2 and 3 from the spacers 52 and 70 will be described. As shown in FIGS. 11 to 14, a pair of jack mechanisms 84 and 85 are formed in the connection pin holes 67 and 83 after the respective connection pins 53 and 71 of the front connection mechanism 50 and the rear connection mechanism 51 are removed. , 86, 87 can be assembled oppositely from both upper and lower sides.

First, a pair of jack mechanisms 84 on the front side,
The jack mechanism 84 on the upper side of the jack mechanism 85 will be described. As shown in FIGS.
4 includes a mounting seat 88 that can be fitted into the elongated hole 54a of the pedestal 54 from the inside of the front body 13, and a jack bolt 89 that is mounted on the mounting seat 88 in a vertical direction and that can be moved and adjusted. A reaction force receiving portion 90 for closing the connection pin hole 83 of the spacer 52 is welded to the second spacer 52b. Bolt 60 of the first spacer 5
2a, and by operating the jack mechanism 84,
The first shield machine 2 is separated from the spacer 52.

Next, the lower jack mechanism 85 will be described. As shown in FIGS.
5 is a mounting seat 91 that can be welded to the step of the pedestal 55,
A jack bolt 92 is attached to the mounting seat 91 in the vertical direction and is adjustable in movement. Reaction force seat 9
0 is welded to the second spacer 52b, and the tip of a jack bolt 92 is brought into contact with the reaction force receiving seat 90 so that a plurality of bolts 60 are inserted from inside the front body 38 into the second spacer 52b.
And by operating the jack mechanism 85, the second
The shield machine 3 is separated from the spacer 52.

Next, a pair of rear jack mechanisms 86, 8 are provided.
7, the jack mechanism 86 can be inserted into a pair of left and right connection pin holes 83 of the upper pedestal 72 from the inside of the rear body 15 as shown in FIG. 12. The vehicle includes a pair of mounting seats 93 and jack bolts 94 which are mounted on the mounting seats 93 in a vertical direction and whose movement can be adjusted. The reaction force receivers 96 for closing the respective connection pin holes 83 of the spacer 70 are welded to the spacers 70, respectively, and then the ends of the jack bolts 94 are brought into contact with the respective reaction force receivers 96. A plurality of bolts 95 are removed from the spacer 70 from the
By operating the first shield machine 2 with the spacer 7
Separate from zero. Note that the lower jack mechanism 87 has substantially the same structure as the upper jack mechanism 86, and a description thereof will be omitted. However, when the first shield machine 2 starts to branch off, the tip of the lower jack bolt is positioned at the reaction force seat 9.
6, the lower jack bolts can receive the thrust force acting on the spacer 70 in the thrust direction.

The above-described twin shield excavator 2,
The operation of No. 3 will be described. In a state where the adjacent shield excavators 2 and 3 are connected in parallel by the coupling mechanism 4, as shown in FIG. 1, both shield excavators 2 and 3 are integrally shielded and excavated. The tunnel can be dug in parallel. At this time, since the electric cable 75 is provided in the through hole of the right connecting pin 71 of the rear connecting mechanism 51, the electric cable 7 is provided.
5, the control panels (not shown) of the shield excavators 2, 3 are connected, and a control signal for synchronizing the shield excavation of the shield excavators 2, 3 can be transmitted. The operation of both shield machines 2 and 3 can be performed collectively on any one of the operation panels 3.

Since a connection oil passage 74 is provided in a through hole of the left connection pin 71 of the rear connection mechanism 51, a supply oil passage of a hydraulic circuit (not shown) of both shield excavators 2 and 3 is provided. The connection is made by the connection oil passage 74, and the hydraulic pressure for synchronously operating the shield jacks 9, 34 of the shield excavators 2, 3 can be transmitted and adjusted to the same pressure.

When the shield excavators 2 and 3 are to be switched to a single excavation, the excavation is interrupted when the branch excavation point is reached, and the first and second shield excavators 2 and 3 are switched through the following steps. We start branching sequentially. That is, in the first step, as shown in FIG. 4 and FIG.
The nut member 56 is partially cut to partially open the long hole 54a to the upper portion, and the first spacer 52a and the second spacer 52 are used from inside the front body 13 by using the long hole 54a (work hole).
b is integrally welded. Next, as shown in FIG. 7, the connection pin 53 is removed, and the connection pin hole 67 extending between the pair of pedestals 54 and 55 and the spacer 52 is communicated.

In the rear connecting mechanism 51, as shown in FIG. 6, the electric cable 75 and the connecting fitting of the connecting oil passage 74 are removed from the through holes of the connecting pins 71, and the blind plug 7 is removed.
6 is removed, and a water stop washer 97 and a bolt 95 are attached. Next, as shown in FIG. 8, each connecting pin 71 is removed, and a connecting pin hole 83 extending between the pair of pedestals 72 and the spacer 70 is communicated.

Next, in the second step, the front connecting mechanism 5
In the case of 0, as shown in FIG. 9, the reaction force receiving seat 90 for closing the connecting pin hole 67 of the spacer 52 is welded to the second spacer 52b. Next, as shown in FIG. 11, mounting seats 88 of a pair of jack mechanisms 84 and 85 from both sides of the connecting pin hole 67.
The mounting seats 88, 91 are water-tightly welded to the pedestals 54, 55. Since the jack bolts 89 and 92 are mounted on the mounting seats 88 and 91 in advance, both ends of the connecting pin hole 67 are sealed watertight at the time of completion of the water stop welding.

In the rear connecting mechanism 51, as shown in FIG. 10, a pair of reaction force receiving seats 96 for closing the respective connecting pin holes 83 of the spacer 70 are temporarily connected to the respective jack bolts of the lower jack mechanism 87. Spacer 70 while positioning on alignment
To the rear body 15 side. Next, as shown in FIG. 12, the mounting seats 93 of the upper jack mechanisms 86 are assembled, and these mounting seats 93 are water-tightly welded to the pedestal 72. Since the jack bolts 94 are attached to the respective mounting seats 72 in advance, the connection pin holes 8 are formed at the time of completion of the waterproof welding.
3. Both ends are sealed watertight.

Next, in the third step, the front connecting mechanism 5
13, a stopper member 98 having a U-shaped cross section is welded to the inner peripheral surface of the front body 13 so as to cover the plurality of bolts 60, and these plurality of bolts 60 are connected to the front body 1 as shown in FIG.
3 and the spacer 52 and the first
The shield machine 2 can be separated. Next, as shown in FIG. 15, when the jack bolt 89 of the upper jack mechanism 84 is pushed in by a predetermined stroke, the first shield machine 2 is separated from the spacer 52.

In the rear connecting mechanism 51, as shown in FIG. 14, a stopper member 99 having a U-shaped cross section is welded to the inner peripheral surface of the rear body 15 so as to cover the plurality of bolts 95. 95 is retracted slightly inward from the outer peripheral surface of the rear trunk 15 so that the spacer 70 and the first shield machine 2 can be separated. Next, as shown in FIG. 16, when the jack bolt 94 of the upper jack mechanism 86 is pushed in by a predetermined stroke, the first shield machine 2 is separated from the spacer 70.

After the third step, the front connecting mechanism 50 separates the jack bolt 89 of the upper jack mechanism 84 from the reaction force receiving seat 90 as shown in FIG. Is welded to the pedestal 88 in a watertight manner. As shown in FIG. 19, after a plurality of bolts 60 are pulled in slightly from the outer peripheral surface of the front body 13, the bolts 60 are welded to the washer 100 in a watertight manner. Reference numeral 101 denotes an O-ring for stopping water. The plurality of bolts 60 may be welded to the washer 100 in the third step.

In the rear connection mechanism 51, as shown in FIG. 18, the jack bolt 94 of the upper jack mechanism 86 is separated from the reaction force receiving seat 96, and the outer peripheral portion on the base end side of the jack bolt 94 is attached to the pedestal 93. Welding is made watertight. After the plurality of bolts 95 are pulled inward slightly from the outer peripheral surface of the rear trunk 15, they are welded to the washer 97 in a watertight manner, and further, the stopper members 99 and the bolts 95 project inward from the inner surface of the rear trunk 15. Disconnect. The washer 97 of the plurality of bolts 95
Welding and cutting operations may be performed in the third step. Next, in a fourth step, as shown in FIG. 20, the first shield machine 2 is branched and started. At this time, the spacers 52 and 70 remain on the second shield machine 3 side.

Next, in the fifth step, the front connecting mechanism 5
0, as shown in FIG.
Are welded to the inner peripheral surface of the front body 38 so as to cover the plurality of bolts 60, and the plurality of bolts 60 are drawn inward slightly from the outer peripheral surface of the front body 38, so that the spacer 52, the second shield excavator 3, Are separable. Next, as shown in FIG. 23, when the jack bolt 92 of the lower jack mechanism 85 is pushed in by a predetermined stroke, the spacer 52 is separated from the second shield machine 3.

In the rear connecting mechanism 51, as shown in FIG. 22, a plurality of stopper members 99 are welded to the inner peripheral surface of the rear body 39 so as to cover the plurality of bolts 95, and these plurality of bolts 95 are connected to the rear body. The spacer 70 and the second shield machine 3 can be separated from each other by being drawn slightly inward from the outer peripheral surface of the spacer 39. Next, as shown in FIG.
When the jack bolt 7 is pushed in by a predetermined stroke, the spacer 70 is separated from the rear trunk 39, that is, the second shield machine 3.

After the fifth step, the front connecting mechanism 50 separates the jack bolt 92 of the lower jack mechanism 85 from the reaction force receiving seat 90 as shown in FIG. The outer peripheral portion on the side is welded to the pedestal 55 in a watertight manner. As described above, after the plurality of bolts 60 are pulled inward slightly from the outer peripheral surface of the front body 38, the washer 100
(See FIG. 19). Rear connection mechanism 5
In FIG. 26, as shown in FIG.
The jack bolt is separated from the reaction force receiving seat 96, and the outer peripheral portion on the base end side of the jack bolt is welded to the pedestal 72 in a watertight manner. Next, in the sixth step, as shown in FIG. 27, the second shield machine 3 is branched and started. At this time, the spacers 52 and 70 remain in the ground.

According to the above-described method of branching and starting the double-type shield machine 1 in the first step, the connection pins 53 and 71 of the connection mechanisms 50 and 51 are removed and the connection pin holes 67 and 83 are connected. By doing so, in the next second step, a pair of jack mechanisms 8 from both sides of the connection pin holes 67 and 83 are formed.
4,85,86,87 can be assembled. At this time, since both end portions of the connection pin holes 67 and 83 are sealed in a watertight manner, the shield excavators 2 and
It is possible to prevent water and earth and sand from entering the inside.

In the third step, the upper jack mechanism 8
The first shield machine 2 is separated from the spacers 52 and 70 by operating the fourth and the fourth shield 86, and then the first shield machine 2 can be smoothly branched and started in a desired excavation direction in the fourth step. Since the vehicle starts to separate from the spacers 52 and 70, a large frictional force does not act between the spacers 52 and 70 and the body members 6 and 31 are not damaged.

After the third step and before the fourth step, for example, in the front connecting mechanism 50, the tip end of the jack bolt 89 of the upper jack mechanism 84 is separated from the reaction force receiving seat 90,
Since the base end portion of the jack bolt 89 is welded and joined to the pedestal 88 in a water-tight manner, the shield machine 2 can be smoothly branched and started in a desired excavation direction, and the water of the shield machine 2 can be stopped even after the branch. High performance can be maintained. The same applies to the rear connection mechanism 51, and the same operation and effect can be obtained when the second shield machine 3 is branched and started.

Next, a modified embodiment in which the present embodiment is partially modified will be described. 1) The second shield machine 3 can be branched and started first, and then the first shield machine 2 can be branched and started. The branch start method of the present invention is not limited to the double shield excavator, but is also applicable to a double shield excavator in which three or more shield excavators are connected in parallel. 2) In the branch start method of the present embodiment, the front coupling mechanism 50
Although the steps of the rear connection mechanism 51 are performed substantially in parallel, the steps may not be performed in parallel or may not be performed in parallel. 3) When assembling a pair of jack mechanisms from both sides of the connection pin hole, the jack bolts may not be previously mounted on the pedestal. Further, the jack mechanism is not limited to the jack bolt. In addition, without departing from the spirit of the present invention, it is possible to implement the above-described embodiment with various modifications.

[0051]

According to the first aspect of the present invention, in the first step, the connecting pins of each connecting mechanism are removed to connect the connecting pin holes, and in the next second step, the connecting pins of the spacers are connected.
The reaction force seat for closing the hole and welded to the spacer, only assembling a pair of jacking means from both sides of the connecting pin hole, they jack
Since both end portions of the connection pin hole are sealed watertight by the key means, it is possible to prevent water and earth and sand from entering into each shield machine from the connection pin hole. In the third step, the spacer is moved to the one side by a jack means via a reaction force receiving seat.
By pressing the shield machine towards isolating, whereas the side of the shield machine is separated from the spacer, then, than one side of the shield machine in the fourth step Ru branches start smoothly to a desired excavation direction, A large frictional force does not act between the spacer and the spacer, and the trunk member is not damaged.

According to the second aspect of the present invention, in the fifth step, the other jack means is used to space through the reaction force receiving seat.
To the direction that separates the shield from the other side of the shield machine.
Te, and the other side of the shield machine is separated from the spacer, then the shield machine on the other side in the sixth step, whereas since is smoothly branched start to shield machine as well as the desired excavation direction side, other Similar to claim 1 ,
No large frictional force acts between the
There is no damage to the members.

According to the third aspect of the present invention, the two tunnels can be dug in parallel by connecting the pair of shield excavators by the front connection mechanism and the rear connection mechanism. When switching the machine to single excavation, it is only necessary to disconnect these front connection mechanism and rear connection mechanism,
The structure for switching to single excavation can be simplified. Other claim 2
It has the same effect as.

According to the fourth aspect of the present invention, since the seal member is mounted on the pedestal of the jack bolt incorporated in the second step, the water stopping performance inside each shield excavator is kept high. Other effects similar to those of the second or third aspect are exhibited. According to the invention of claim 5, after the third step and before the fourth step, the distal end of the jack bolt of one jack means is separated from the reaction force receiving seat, and the base end portion of this jack bolt is connected to the one side. Since it is welded and joined to the pedestal in a watertight manner, the shield excavator on one side can be smoothly branched and started in the desired excavation direction, and the water stopping performance of this shield excavator can be maintained high even after the branch and start. it can. The other effects are the same as those of the fourth aspect.

According to the invention of claim 6, after the fifth step,
Before the sixth step, the distal end of the jack bolt of the other jack means is separated from the reaction force seat, and the base end portion of this jack bolt is welded to the other pedestal in a watertight manner.
The shield excavator on the other side can be smoothly branched and started in a desired excavation direction, and the water stopping performance of the shield excavator can be kept high even after the branched start. The other effects are the same as those of the fourth aspect.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view of a double shield excavator according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part of a spacer, a connecting pin, and a pedestal of a front connecting mechanism.

FIG. 3 is a cross-sectional view of a main part of a spacer, a connecting pin, and a pedestal of a rear connecting mechanism.

FIG. 4 is a view corresponding to FIG. 2 for explaining an operation process in which a part of a nut member of a connection pin of a front connection mechanism is cut and a pair of spacers is welded and joined through an operation hole thereof.

5 is an end view taken along line VV of FIG. 4;

FIG. 6 is a diagram corresponding to FIG. 3, illustrating a preparation stage for releasing the connection of the rear connection mechanism.

FIG. 7 is a cross-sectional view of a main part showing a state in which the front connecting mechanism has been disconnected and the connecting pin holes have been communicated.

FIG. 8 is a cross-sectional view of a main part showing a state where the rear connecting mechanism has been disconnected and the connecting pin holes have been communicated.

FIG. 9 is a cross-sectional view of an essential part for explaining an operation process and the like for welding a reaction force receiving seat for closing a connection pin hole of a spacer of the front connection mechanism to the spacer;

FIG. 10 is a cross-sectional view of an essential part for explaining an operation process of welding and joining the reaction force receiving seat for closing the connecting pin hole of the spacer of the rear connecting mechanism to the spacer while temporarily aligning it with the lower jack means.

FIG. 11 is a cross-sectional view of an essential part for explaining a work process of assembling a pair of jack means from both sides of the connection pin hole of the front connection mechanism in an opposed manner and sealing both ends of the connection pin hole in a watertight manner. .

FIG. 12 is a cross-sectional view of an essential part for explaining a work process of assembling a pair of jack means from both sides of the connection pin hole of the rear connection mechanism in a facing manner and sealing both ends of the connection pin hole in a watertight manner.

FIG. 13 is an explanatory diagram of a preparation stage for separating a shield excavator on a branch start side from a spacer of a front connection mechanism.

FIG. 14 is an explanatory view of a preparation stage for separating the shield machine on the side to be branched and started from the spacer of the rear connection mechanism.

FIG. 15 is a cross-sectional view of a main part showing a state where the shield machine is separated from the spacer of the front connection mechanism by one jack means.

FIG. 16 is a cross-sectional view of a main part showing a state where the shield machine is separated from the spacer of the rear connection mechanism by one jack means.

FIG. 17 is an explanatory diagram of a preparatory stage immediately before branch-starting one shield excavator in the front coupling mechanism.

FIG. 18 is an explanatory diagram of a preparation stage immediately before branch-starting one shield excavator in the rear connection mechanism.

19 is an enlarged view of a main part of FIG. 17;

FIG. 20 is a vertical cross-sectional view of a double shield excavator in a state where one shield excavator is branched and started.

FIG. 21 is an explanatory diagram of a preparation stage for separating the shield excavator on the other side from the spacer of the front connection mechanism.

FIG. 22 is an explanatory diagram of a preparation stage for separating the other shield excavator from the spacer of the rear connection mechanism.

FIG. 23 is a cross-sectional view of a main part showing a state where the shield machine is separated from the spacer of the front connection mechanism by the other jack means.

FIG. 24 is a cross-sectional view of a main part showing a state where the shield machine is separated from the spacer of the rear connection mechanism by the other jack means.

FIG. 25 is an explanatory diagram of a preparatory stage in the front connection mechanism immediately before branch-starting the other shield excavator on the other side.

FIG. 26 is an explanatory diagram of a preparation stage immediately before branch-starting the other shield excavator in the rear connection mechanism.

FIG. 27 is a longitudinal sectional view showing a state where the other shield excavator is branched and started.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 double shield excavator 2 first shield excavator 3 second shield excavator 4 connecting mechanism 50 front connecting mechanism 51 rear connecting mechanism 52, 70 spacer 53, 71 connecting pin 54, 55, 72 pedestal 67, 83 connected Pin hole 84-87 Jack mechanism 89, 92, 94 Jack bolt 90, 96 Reaction force seat

──────────────────────────────────────────────────続 き Continuing on the front page (72) Yoshiro Nishimatsu, Inventor 1-20-10 Toranomon, Minato-ku, Tokyo Nishimatsu Construction Co., Ltd. (72) Yukihiro Konan 1-20-10 Toranomon, Minato-ku, Tokyo Nishimatsu (56) References JP-A-3-13694 (JP, A) Patent 2895057 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) E21D 9/06 301

Claims (6)

(57) [Claims] 1. A shield mechanism comprising a spacer sandwiched between a plurality of shield excavators, a connecting pin for inserting the spacer, and a pedestal supporting an end of the connecting pin in the shield excavator. The tunnel is dug by a double shield type shield excavator that connects excavators in parallel,
Thereafter, in a branching and starting method in which excavation is interrupted and each shield excavator is sequentially separated from the spacer and switched to single excavation, a connecting pin of each connecting mechanism is removed, and a connecting pin hole extending between a pair of pedestals and the spacer is communicated. One step, and the reaction force seat for closing the connection pin hole of the spacer is used as the spacer.
Welding is performed, and a pair of jack means is assembled from both sides of the connecting pin hole so as to face each other.
A second step of sealing both end portions of the connection pin hole in a watertight manner by means of a key, and the spacer being connected to the one side of the spacer via a reaction force seat by one jack means in a shield machine on one side of the spacer.
A third step of separating the shield machine from the spacer by pushing the shield machine away from the shield machine, and a fourth step of branching and starting the one shield machine. The branching start method of the double shield type shield machine. 2. The other jacking means in the shield machine on the other side of the spacer through a reaction force receiving seat.
To isolate the spacer from the other shield machine
The method according to claim 1, further comprising: a fifth step of pushing the other side of the shield excavator from the spacer by pushing the shield excavator on the other side, and a sixth step of branching and starting the other side of the shield excavator. Branch start method of a double shield type shield machine. 3. The multiple connecting type shield excavator according to claim 2, wherein the pair of shield excavating machines is a pair of shield excavating machines connected by a front connecting mechanism and a rear connecting mechanism. Branch start method of a shielded tunnel machine. Te wherein said second step smell, the reaction force seat for closing the connecting pin hole of the spacer is welded to the spacer, with each jack bolt as the both jack means, the distal end portion of the both jack bolt 4. The method according to claim 2, wherein the branching abutment is brought into contact with a reaction force receiving seat. 5. 5. After the third step and before the fourth step, the tip of the jack bolt of one jack means is separated from the reaction force receiving seat, and the base end of the jack bolt is watertight to one of the pedestals. 5. The method according to claim 4, wherein welding is performed.
2. The branching start method of the double shield type shield machine described in 1). 6. After the fifth step and before the sixth step, the tip end of the jack bolt of the other jack means is separated from the reaction force receiving seat, and the base end portion of this jack bolt is watertight to the other pedestal. 5. The method according to claim 4, wherein welding is performed.
2. The branching start method of the double shield type shield machine described in 1).