JPH0624473Y2 - Shield moat machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a shield machine for underground docking for connecting tunnel walls to each other in the ground.

[Prior Art] In general, an underground docking shield for connecting tunnel walls to each other in the ground has a configuration as shown in FIG. The illustrated example shows a side tunnel 2 for laying underground cables etc. in an existing tunnel 1 for vehicles or railways.
Is to be connected. The excavator 3 excavates toward the existing tunnel 1 so as to form the side tunnel 2 while disposing segments (not shown).

The excavator 3 is provided with a cylindrical shield frame 4,
A cutter face plate 5 that constitutes an excavation portion is provided at a front portion of the shield frame 4 in the excavation direction. A cylindrical protection cylinder 6 is movably fitted to the outer peripheral portion of the shield frame 4 in the excavation direction, and the protection cylinder 6 is moved by a slide jack 7. One end of the slide jack 7 is fixedly connected to the inner wall of the shield frame 4, and the other end is fixedly connected to the inner wall of the protective cylinder 6.

Therefore, in the case of underground docking, when the excavator 3 moves closer to the existing tunnel 1, the excavator 3 stops moving while the ground 8 remains, and in this state, the slide jack 7 extends and moves to protect the protective cylinder 6. Is pushed forward in the digging direction. The protective cylinder 6 is pushed into the natural ground 8 and connected to the existing tunnel 1. After that, by removing the internal equipment such as the cutter face plate 5 and scraping out the natural ground 8 ahead in the excavation direction, the side tunnel 2 is connected to the existing tunnel 1.

[Problems to be Solved by the Invention] By the way, a slide jack 7 is housed in the shield frame 4 in order to move the protective cylinder 6, and one end of the slide jack 7 has a rear engagement piece 9 interposed therebetween. 4 and the other end is fixed to the protective cylinder 6 via the front engaging piece 10. In particular, the front engaging piece 10 connects the shield frame 4 and the slide jack 7 housed inside and the protection cylinder 6 that is superposed on the outside thereof. Therefore, the shield frame 4 is formed with an elongated guide hole 11 for guiding the movement of the front engagement piece 10 in the excavation direction by the expansion and contraction movement of the slide jack 7.

Therefore, if the push-out amount of the protective cylinder 6 is lengthened, the guide hole 11 is opened to the natural ground 12 above the shield frame 4, and spring water and inflow of sand and sand may occur from the guide hole 11 into the shield frame 4. become. Therefore, conventionally, a waterproofing agent is put into the natural ground 12, and there is a problem that the docking work is complicated and the construction period becomes long.

The present invention was created to effectively solve the above problems.

An object of the present invention is to provide a shield machine capable of simplifying underground docking work and shortening the construction period.

[Means for Solving the Problems] The present invention is a cylindrical shield frame having an excavation portion at the front portion in the excavation direction, and a shield frame that is movably fitted to the outer peripheral portion of the shield frame in the machine length direction. A protective tube having an engagement piece provided to engage with it, and a guide groove for accommodating the engagement piece that is recessed from the outside to the inside of the shield frame and for guiding the engagement piece in the machine length direction. And a protective cylinder moving means for applying a propulsive force to the engaging piece engaged in the guide groove to move the protective cylinder forward of the shield frame in the excavation direction.

[Operation] Since the guide groove is thus recessed from the outer side to the inner side of the shield frame to accommodate the engagement piece of the protective cylinder, the outer side and the inner side of the shield frame are blocked from each other, and the spring water is transferred when the protective cylinder is transferred. It is not necessary to add a waterproofing agent to prevent the inflow of soil and sand.

[Embodiment] An embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

In FIG. 1, a side tunnel 2 for laying a cable is connected to an existing tunnel 1 for a vehicle, for example. In order to form the side tunnel 2, the excavator 3 excavates and moves in the ground toward the existing tunnel 1 while arranging the segment S that receives the excavation reaction force.

As shown in FIG. 1 and FIG. 2, the machine 3 has a cylindrical shield frame 4, and the shield frame 4 is provided with a cutter face plate 5 which constitutes an excavation part in the front part thereof and the inside of the shield frame 4. Is provided with a shield jack 21 that gives the shield frame 4 a digging force. The shield jack 21 is held by a girder portion 22 extending like a flange in the shield frame 4, one end of which is connected to the inner peripheral wall of the shield frame 4 and the other end of which is detachably engaged with the segment S. It is like this.

A protective cylinder 6 is fitted to the outer peripheral portion of the shield frame 4 so as to cover the shield frame 4 so as to be movable in the machine length direction, and an engagement piece 23 that engages with the shield frame 4 is provided on the inner peripheral wall of the protective cylinder 6. It is provided. That is, a step portion 24 is formed in the central portion of the shield frame 4 for engaging with and holding the rear end portion of the protective cylinder 6 during the excavation.

In particular, the shield frame 4 is formed with a guide groove 31 for guiding the engagement piece 23 of the protective cylinder 6 in the machine length direction. The guide groove 31 is recessed from the outer side to the inner side of the shield frame 4 to accommodate the engagement piece 23 of the protective cylinder 6 and extends in the machine length direction for a length sufficient to transfer the protective cylinder 6 in the excavation direction.

Further, a protection tube moving means 32 for moving the protection tube 6 forward of the shield frame 4 in the excavation direction is connected to the engagement piece 23 of the protection tube 6. The protection cylinder moving means 32 is composed of a protection cylinder jack 33 which is arranged alternately with the shield jack 21 along the inner wall of the shield frame 4. The jack 33 is attached to the segment S by a mounting seat 34.
And a rod portion 35b that is sequentially extended from the cylinder portion 35a in the excavation direction.

As shown in FIGS. 2 and 3, the rod portion 35b is composed of a plurality of rod pieces 36 that are threadably connected to the cylinder portion 35a. Both ends of these rod pieces 36 are connected to each other and inserted into the rear end of the guide groove 31, and the insertion tip end thereof is detachably connected to the engagement piece 23. In this embodiment, as shown in FIG. 3, the engaging piece 23 is provided with a connecting portion 37 that is connected to the insertion tip of the rod portion 35b. Further, at the rear end portion of the guide groove 31, a rod portion 35b which is inserted into the guide groove 31 is provided.
A seal member 38 is provided to seal the gap between and.

Therefore, when the protective cylinder 6 is transferred, the cylinder portion 3
The rod pieces 36 are successively added between the 5a and the engagement pieces 23 to give the protective cylinder 6 a digging force.

Next, the operation of the above embodiment will be described.

As shown in FIG. 1, when the excavator 3 is stopped to connect the side tunnel 2 to the existing tunnel 1 and the underground docking is performed, as shown in FIG. The protection cylinder 6 is transferred to the tunnel.

Specifically, as shown in FIG. 4, the rear end portion of the shortened protective cylinder jack 33 is engaged with the segment S to be installed, and at the same time, between the jack 33 and the engaging piece 23, one The rod piece 36a is inserted and connected. In this state, as shown in FIG. 5, by extending the jack 33 while receiving the propulsive reaction force at the segment S, the protective cylinder 6 is moved forward by the length l of the added rod piece 36 in the excavation direction. become.

In order to further transfer the protective cylinder 6, as shown in FIG. 6, the jack 33 is again shortened and moved, and the jack 33 is moved.
The second rod piece 36 is inserted into the gap formed between the first rod piece 36 and the first rod piece 36 for connection. Therefore, the entire rod portion 35b is extended to the length of the two rod pieces 36. Therefore, by extending and moving the jack 33, the protective cylinder 6 is further moved by the length of the added rod piece 36.

In this embodiment, as shown in FIG. 7, a total of three rod pieces 36 are added in order to push the protective cylinder 6 to the required amount, and the protective cylinder 6 is transferred by the additional amount.

Therefore, the protective cylinder 6 is pushed out by a necessary amount, and accordingly, a widely opened opening 38 is formed between the protective cylinder 6 and the step portion 24 of the shield frame 4, and the rod portion 35b.
Is exposed to the ground 12 side. In this case, since the guide groove 31 closes and seals the outer peripheral portion of the shield frame 4 so as to cover the rod portion 35b, it is possible to prevent dirt and the like from entering the shield frame 4 through the opening 38.

In this way, when the protective cylinder 6 is pushed out by the required amount and its tip is connected to the existing tunnel 1, as shown in FIGS. 1 and 2, the internal equipment including the cutter face plate 5 is removed and the excavation is performed. By removing the natural ground 8 in the front direction,
The side tunnel 2 is connected to the existing tunnel 1.

As described above, the present invention includes the guide groove 3 that is recessed from the outer side to the inner side of the shield frame 4 to accommodate the engagement piece 23 of the protection tube 6.
By forming 1, the outer side and the inner side of the shield frame 4 are shielded from each other, and the conventional waterproofing agent is unnecessary. Therefore, the docking work can be simplified and the construction period and construction cost can be reduced. Moreover, since the protection cylinder 6 is transferred by adding the rod pieces 36, a short jack can be adopted. Therefore, it is possible to employ the compact machine 3 having a short captain.

[Advantages of the Invention] In summary, according to the present invention, since the guide groove for accommodating the engagement piece of the protective cylinder is formed by being recessed from the outside to the inside of the shield frame, the outside and the inside of the shield frame are blocked. Since no waterproofing agent is required, the docking work can be simplified and the construction period and construction cost can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view showing an underground docking state, FIG. 3 is a sectional view showing an essential part of FIG. 1, and FIGS. 4 to 7 8 is a sectional view showing a docking operation, and FIG. 8 is a sectional view showing a conventional underground docking. In the figure, 4 is a shield frame, 6 is a protective cylinder, 23 is an engaging piece, 31 is a guide groove, and 32 is a protective cylinder moving means.

Claims (1)

[Scope of utility model registration request] 1. A cylindrical shield frame having an excavation portion at a front portion in the excavation direction, and an outer peripheral portion of the shield frame movably fitted in the machine length direction and provided to engage with the shield frame. A protective cylinder having an engaging piece, a guide groove for accommodating the engaging piece that is recessed from the outside to the inside of the shield frame, and guiding the engaging piece in the machine length direction, and a guide groove for engaging the guide groove. A shield machine having a protection cylinder moving means for applying a propulsive force to the combined engagement pieces to move the protection cylinder forward of the shield frame in the direction of travel.