JPH1122368A - Two-stage type shield machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dissolve a problem wherein workability in a limited shield is worsened and there is a need for a high equipment cost since many jacks individually functioned according to size and separate rolling stoppers are arranged, in a two-state shield machine providing conventional large and small shield anger with respective middle folding mechanisms. SOLUTION: Middle folding shafts K of a large shield machine Ma and a small shield machine Mb are arranged on a coaxis. During large tunnel excavation in a state that two shield machine Ma and Mb are united together, by adding the force of a large middle folding jack 11 of the large shield machine Ma to the force of a small shield middle folding jack 16 of the small shield machine Mb and effecting cooperation, the whole of the shield machine is bent. The constitution reduces the number of middle folding jack bodies to bend the large shield machine, Ma and increases space in the machine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-stage shield machine capable of continuously excavating a ground from a large-diameter tunnel to a small-diameter tunnel. The present invention relates to a two-stage shield machine capable of improving the maintainability by using a shield.

[0002]

2. Description of the Related Art Conventionally, a shield excavator has been used as a means for forming a tunnel (transverse tunnel) underground, and in recent years, sewage, electricity, telephone lines and the like in urban maintenance and the like are buried in recent years. Tunnel construction is increasing rapidly. As such tunnel construction, there is a demand for forming a small-diameter so-called branch pipe on the upstream side and forming a large-diameter so-called main pipe on the downstream side as in, for example, sewerage work. In the case of forming such a tunnel, a stand is provided at a junction point having a different tunnel diameter, and from this stand, each tunnel is excavated by a different shield excavator having a different diameter and connected at the stand position. However, providing a shaft at each junction requires a lot of cost and time. In addition, there is a case where a pier cannot be provided in an urban area. In this case, all the two tunnels having different diameters are excavated with a large diameter, so that a large amount of cost is required.

[0003] In many cases, it is difficult to excavate such a tunnel in a straight line, and there is also a great demand for curvilinear excavation along a road or the like.

In order to meet such a demand, a two-stage shield machine which does not require a shaft at a junction has been developed. For example, as disclosed in Japanese Patent Application Laid-Open No. 8-151890, a center bending mechanism is used. There is a large shield machine having a folding mechanism in which a small shield machine having a folding mechanism is coaxially arranged. According to the invention, a large shield jack and a large shield jack are provided in a large shield machine, a small shield jack and a medium shield jack for a small shield are provided in a small shield machine, and a large shield jack is provided when excavating a large diameter tunnel. It is configured to excavate with a large shield middle bent jack, and when excavating a small diameter tunnel, it excavates with a small shield jack and a small shield middle bent jack.

[0005] As another conventional technique, Japanese Patent Application Laid-Open No. 8-1 is disclosed.
No. 89286, Japanese Patent Application Laid-Open No. 8-189288, etc., but these inventions do not have a structure in which a middle bending jack is provided in a large shield excavator and a small shield excavator unlike the invention according to this application. However, there is no problem that the invention according to this application intends to solve.

[0006]

However, in the above prior art, only a large shield jack and a large shield middle bending jack are used when excavating a large diameter tunnel, and a small shield jack and a small shield middle bending jack are used when excavating a small diameter tunnel. Therefore, a large amount of money is required to equip many jacks, such as a small shield jack and a small-bend jack for small shields, which do not perform their functions during large-diameter tunnel excavation and follow in a free state. doing.

In addition, since the center bending jack bends the front body by receiving the excavating thrust of the shield jack, there are many jacks for a large shield excavator and a small shield excavator which can exert thrust almost equal to the shield jack. Since it is necessary to provide the shield excavator, it occupies a large amount of space in the limited shield excavation machine, which leads to a decrease in maintainability of each device in the machine.

In addition, since both shield excavators have a folding mechanism, rolling stoppers for preventing the front body from rolling due to the rotational reaction force of the cutter disk are also provided for large shield excavators and small shield excavators. It is equipped with two sets, and in order to allow manufacturing tolerances to manufacture and assemble separately, it is necessary to have a slightly large play (play) on the rolling stopper of the small shield machine, and at the time of excavation in the united state Also, since only the rolling stopper of the large shield machine works, a large amount of cost is required to provide a rolling stopper for the small shield having a low operation rate.

As described above, in the conventional two-stage shield excavator having both the large shield excavator and the small shield excavator with a center bending mechanism, many jacks functioning separately in large and small and a separate rolling stopper are provided. Therefore, workability in a narrow shield machine becomes worse, and much equipment cost is required.

[0010]

Therefore, in order to solve the above-mentioned problems, the invention according to the present application is to provide a large shield excavator and a small shield excavator with the center bending axes coaxially arranged. When excavating a large diameter tunnel with the machine combined, the entire shield excavator is bent by the thrust that cooperated with the small shield middle bending jack of the small shield excavator and the large shield middle bending jack of the large shield excavator I have to.

As described above, when excavating a large-diameter tunnel in a state where the large shield excavator and the small shield excavator are combined, the small shield intermediate bend of the small shield excavator is applied to the thrust force of the large shield intermediate bend jack of the large shield excavator. By cooperating by applying the thrust of the jacks, it is possible to reduce the number of bent buckle jacks for bending the large shield excavator in the united state and to increase the space inside the machine. In this case, the rolling stopper of the large shield machine can be eliminated.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to this application is to provide a large shield excavator and a small shield excavator in which a center bending axis is coaxially arranged. A transmission member for transmitting the excavation reaction force acting on the small shield machine from the cutter disk to the large shield machine is provided between the cutter disk, and the thrust that can bend the small shield machine by the bending mechanism of the small shield machine. A large shield with a thrust that can bend the whole shield excavator united with the small shield mid-bending jack when it is cooperated with the small shield mid-bending jack with a small shield middle bending jack with a A folding jack is provided.

Thus, the excavation reaction force acting on the small shield machine can be transmitted to the large shield machine by the transmission member, so that the small shield machine provided in the small shield machine can be bent. Even if the large shield jacking machine is provided with a medium bending jack having a thrust that is equal to the thrust of the folding jack, the combined shield jacking machine can be bent by cooperating the two middle folding jacks.

If the small shield middle folding jack and the large shield middle folding jack are arranged at symmetrical positions in the vertical and horizontal directions from the axis of the shield excavator, it is possible to easily control the middle bending jack during curve propulsion.

Further, a driving device for rotating and driving the combined cutter disk is provided in the small shield machine, and a rolling stopper for supporting a rotational reaction force of the cutter disk between a front body and a rear body of the small shield machine. Is provided, the rolling stopper for excavation in the large shield machine can also be used as the rolling stopper provided in the small shield machine.

If this rolling stopper is provided at the upper and lower positions of the small shield machine, it is possible to secure a space for providing the center bending jack at the left and right positions.

Furthermore, if the front bodies of the large shield excavator and the small shield excavator are connected by the front body fixing plates provided in the vertical and horizontal directions of the axis, both the front bodies are bent integrally during excavation. The required rigidity can be easily secured.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the invention according to the present application will be described below with reference to the drawings. FIG. 1 is a side sectional view of a two-stage shield machine showing one embodiment of the invention according to this application, FIG. 2 is a front view of the two-stage shield machine, and FIG. It is A sectional drawing.

As shown in the figure, a small shield excavator Mb is coaxially provided within a large shield excavator Ma to constitute a two-stage shield excavator N. These large shield excavator Ma and small shield excavator Ma are provided. The machine Mb is provided with center bending mechanisms Ua and Ub, respectively, so as to enable curved propulsion. The center bending axis K of these center bending mechanisms Ua and Ub is located substantially at the center of the spherical seats 1 and 2, and is disposed substantially coaxially.

The large cutter disk Da provided at the front of the large shield machine Ma and the small cutter disk Db provided at the front of the small shield machine Mb connect or disconnect these cutter disks Da and Db. The cutter disk D is formed by being combined by the face plate fixing device F to be combined.

A driving device for driving the cutter disk D is provided in the small shield machine Mb. A driving motor 4 having a driving gear 3 meshed with a slewing bearing 5 for rotating the cutter disk D is provided. The cutter disk D is provided in the small shield machine Mb, and the drive disk 4 is driven to rotate the cutter disk D.
Reference numeral 6 denotes a connecting member that supports the cutter disk D.

The folding mechanism U of the large shield machine Ma
a is a middle bent jack 11 whose front part is supported by a bracket 8 provided on the front body 7 and whose rear part is supported by a bracket 10a of a large ring garter 10 provided on the rear body 9;
It is constituted by a spherical seat 1 provided between the front trunk 7 and the rear trunk 9, and is configured so that curved propulsion is possible by expanding and contracting the center bending jack 11. In this embodiment, two large shield middle bending jacks 11 are provided at symmetrical positions of the large shield machine Ma, respectively.
The vertical position is also provided to be vertically symmetrical from the center line.

The bending mechanism Ub of the small shield machine Mb
The small ring garter 1 has a front part supported by a bracket 13 provided on a front body 12 and a rear part provided on a rear body 14.
Folding jack 16 supported by the bracket 15a of No. 5
And a spherical seat 2 provided between the front body 12 and the rear body 14. The center bending jack 16 is configured to extend and contract to enable curved propulsion. The three center-folding jacks 16 are also provided symmetrically in the left-right direction and vertically symmetrically from the center line. If these middle folding jacks 11 and 16 are arranged at symmetrical positions, control is easy, but they need not be symmetrically arranged.

Further, between the front body 12 and the rear body 14 of the small shield machine Mb, the front body 12 is prevented from rolling in the anti-rotation direction due to the rotational reaction force of the cutter disk D. A rolling stopper T is provided. This rolling stopper T prevents the front trunk 7 of the large shield machine Ma connected by the front trunk fixing plate 17 from rolling.

On the other hand, a large number of large shield jacks 21 are provided on the large ring gutter 10 of the large shield machine Ma, and the large shield jack 21 takes the excavation reaction force to the segment Sa of the large diameter tunnel. It is configured as follows.

Further, a predetermined number of small shield jacks 23 are provided in a small ring garter 15 provided in the rear trunk 14 of the small shield machine Mb, and a rear end (spreader) of the small shield jack 23 is provided. Is provided so as to abut on a receiving portion 24a formed on the small shield thrust receiver 24 of the large ring garter 10 provided on the rear trunk 9 of the large shield machine Ma. The receiving portion 24a is provided so as to project toward the axis of the small shield machine Mb, and is provided at the same circumferential position as each small shield jack 23.

With this configuration, the muddy water pressure or the like acting on the cutter disk D from the face is transmitted from the center bending jack 16 of the small shield machine Mb to the small shield thrust receiver 24 via the small shield jack 23. To the large shield machine Ma, the friction between the rear trunk 9 of the large shield machine Ma and the ground and the large shield jack 21
It is supported by the contact friction or the like with the segment Sa.

Further, between the front body 7 of the large shield machine Ma and the front body 12 of the small shield machine Mb, four front body fixing plates 17 are provided in the vertical and horizontal directions of the axis. The front body fixing plate 17 and the front bodies 7, 12 are fixed by welding or the like. The rear end of the large ring garter 10 provided on the rear trunk 9 of the large shield excavator Ma and the rear trunk 14 of the small shield excavator Mb are also fixed by welding or the like. A slide rail 18 for starting the small shield machine Mb is provided below the large shield machine Ma.

In this embodiment, the large shield excavator Ma and the small shield excavator Mb are fixed by the front trunk fixing plate 17, the fixing of the large ring garter 10 and the rear trunk 14, and the small shield thrust receiver 24. And a transmission member for transmitting the excavation reaction force.

The face plate fixing device F for fixing the large cutter disk Da and the small cutter disk Db includes a jack 26 provided in the small cutter disk Db and the large cutter disk Da by expansion and contraction of the jack 26.
And a fixing member 27 fitted or detached therefrom. Also, in front of the front trunk 7 of the large shield machine Ma,
A fixing jack 28 serving as a fixing member for fixing the large cutter disc Da to the front body 7 is provided. A plurality of locking members 29 provided on the rear circumference of the large cutter disc Da are provided at the front end of the front body 7. When the fixing jack 28 is extended in a state where the fixing jack 28 is aligned with the position of the locking piece 30 provided in the lock member 29, the locking piece 30 is locked and locked by the locking member 29. When the large cutter disc Da is detached by the face plate fixing device F and the large cutter disc Da is fixed to the front body 7 by the fixing jack 28, the branching of the small shield machine Mb becomes possible.

E is an erector, 22 is a tail seal, 25 is a large shield machine Ma and a small shield machine M
b is a seal member for preventing intrusion of earth and sand from between the front portion and the front portion.

In the small shield machine Mb, a water supply pipe 31 and a drain pipe 32 communicating with the cutter chamber C are provided.
Are provided. In this embodiment, a muddy shield is described as an example, but an earth pressure shield may be used.

According to the two-stage shield excavator N configured as described above, when excavating the large-diameter tunnel in the united state, the reaction force of the cutter disk D is transmitted from the connecting member 6 to the front of the small shield excavator Mb. The power is transmitted to the large ring garter 10 of the large shield machine Ma via the trunk 12, the middle folding jack 16, the small ring garter 15, the small shield jack 23, and the small shield thrust receiver 24, and the large shield jack 21 is provided.
Is received in the segment Sa.

The rotational reaction force of the cutter disk D is:
It is transmitted from the connecting member 6 to the large ring garter 10 via the front trunk 12, the rolling stopper T, and the rear trunk 14 of the small shield machine Mb, and is received by the friction between the rear body 9 of the large shield machine Ma and the ground. Can be

When excavating a large-diameter tunnel in a united state, when excavating a curved tunnel, the large shield center bending jack provided on the large shield machine Ma together with the small shield center bending jack 16 provided on the small shield machine Mb. The center bending jack 1 is provided at a predetermined position so as to exert a thrust for bending the front bodies 7 and 12 in the same direction by cooperating with the jack 11.
1 and 16 are extended, and the center bent jack 11,
16 is reduced.

At this time, since the center bending jacks 11 and 16 have a thrust capable of bending the entire shield excavator, they can be propelled in a curved manner while receiving a propulsion reaction force.

When the small shield machine Mb is branched from the large shield machine Ma, the connecting portion (weld portion) of the front body fixing plate 17 connecting the front bodies 7 and 12 to the front body 12. Etc.) and the connecting portion (welded portion or the like) between the rear trunk 14 and the large ring garter 10 may be separated to separate the large cutter disk Da as described above. This separation work can be easily performed by an operator easily entering between the large shield excavation machine Ma and the small shield excavation machine Mb by reducing the number of the center bending jacks 11 to facilitate the separation work of the front trunk fixing plate 17 and the like. Since it can be performed, the separation operation can be performed with high work efficiency. If the operator enters the space between the front bodies and releases the connection, the connection between the two front bodies can be made into a welding structure that is not a mechanical connection method, and the production cost of the shield machine can be reduced. It becomes possible.

When excavating only with the small shield excavator Mb, the small shield center bending jack 16 provided on the small shield excavator Mb has a thrust capable of bending the small shield excavator Mb. A predetermined small-diameter tunnel can be formed while the small shield machine Mb is curved and propelled. As described above, according to the invention of this application, the small shield middle bending jack 16 provided in the small shield machine Mb is capable of always exhibiting a function during curve propulsion from large diameter tunnel excavation to small diameter tunnel excavation. Become.

[0039]

The invention according to this application is implemented in the form described above, and has the following effects.

When excavating a large-diameter tunnel in the united state, the small shield middle bending jack provided on the small shield machine and the large shield middle bending jack provided on the large shield machine are cooperated to make the entire shield machine curved. Since it can be propelled, it is possible to reduce the number of center bending jacks provided in the large shield machine and increase the inspection space in the machine, thereby improving the maintainability.

In addition, a two-stage shield machine capable of effectively utilizing the space inside the shield machine as well as reducing the equipment cost can be used in order to utilize all the installed middle jacks when excavating a large diameter tunnel. It becomes possible.

Further, if the center-bending jack is arranged at a position symmetrical in the vertical and horizontal directions from the axis of the shield machine, it becomes possible to easily control the center-bending jack during curve propulsion.

If a rolling stopper is provided only in the small shield machine to prevent rolling, the rolling stopper provided in the small shield machine can be used for the large diameter excavation.
By reducing the number of rolling stoppers, it is also possible to increase the inspection space inside the machine and improve maintenance.

If this rolling stopper is provided at the upper and lower positions of the small shield machine, it is possible to secure a space for providing the center bending jack at the left and right positions.

Furthermore, if the front fuselage fixing plates connecting the front fuselage of the large shield excavator and the small shield excavator are provided in the vertical and horizontal directions of the shaft center, the rigidity at the time of excavation can be easily secured. It becomes possible.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a two-stage shield machine showing one embodiment of the invention according to the present application.

FIG. 2 is a front view of the two-stage shield machine shown in FIG. 1;

FIG. 3 is a sectional view of the two-stage shield machine shown in FIG.

4 is a cross-sectional view of the rolling stopper shown in FIG. 1, (a) is a vertical cross-sectional view, and (b) is a BB cross-sectional view of (a).

[Explanation of symbols]

 1, 2, spherical surface seat 3, driving gear 4, driving motor 5, turning bearing 6, connecting member 7, front body 8, bracket 9, rear body 10, large ring garter 11, middle bent jack 12, front body 13, bracket 14 ... rear trunk 15 ... small ring garter 16 ... middle bending jack 17 ... front trunk fixing plate 18 ... slide rail 21 ... large shield jack 22 ... tail seal 23 ... small shield jack 24 ... small shield thrust receiver 25 ... seal member 26 ... Jack 27 ... Fixing material 28 ... Fixing jack 29 ... Locking member 30 ... Locking piece K ... Center bending shaft T ... Rolling stopper C ... Cutter chamber E ... Electr F ... Face plate fixing device D ... Cutter disk Da ... Large cutter disk Db … Small cutter disk Ua… Center bending mechanism Ub… Center bending mechanism Sa… Large shield segment Ma: Large shield excavator Mb: Small shield excavator N: Two-stage shield excavator

[Procedure amendment]

[Submission date] October 14, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Change

[Correction contents]

[Brief description of the drawings]

FIG. 1 is a side sectional view of a two-stage shield machine showing one embodiment of the invention according to the present application.

FIG. 2 is a front view of the two-stage shield machine shown in FIG. 1;

FIG. 3 is a sectional view of the two-stage shield machine shown in FIG.

Claims (4)

[Claims] 1. A small shield machine in which a middle folding mechanism is provided between a front body and a rear body is concentrically arranged in a large shield machine in which a center folding mechanism is provided between a front body and a rear body. In the installed two-stage shield machine, the middle bending axis of the large shield machine and the small shield machine is arranged coaxially, and between the large shield machine and the small shield machine. A transmission member for transmitting the excavation reaction force acting on the small shield machine from the cutter disk to the large shield machine, and having a thrust capable of bending the small shield machine in the bending mechanism of the small shield machine. A small shield middle bending jack is provided, and a large shield having a thrust capable of bending the entire shield excavating machine in a united state when cooperating with the small shield middle bending jack in the middle bending mechanism of the large shield machine. Two-stage shield machine, characterized in that a jack Re. 2. A driving device for rotating and driving the combined cutter disk is provided in a small shield machine, and a rotation reaction force of the cutter disk is supported between a front body and a rear body of the small shield machine. The two-stage shield machine according to claim 1, further comprising a rolling stopper. 3. The two-stage shield machine according to claim 2, wherein rolling stoppers are provided at upper and lower positions of the small shield machine. 4. The front shield of the large shield excavator and the small shield excavator is connected by front fuselage fixing plates provided in the vertical and horizontal directions of the axis. 1
The two-stage shield machine described in the paragraph.