JPH0154519B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an open-cut shield device for sequentially burying humid pipes underground.

Next, a conventional cut-and-cut shield device will be explained with reference to FIGS. 1 and 2.

An extrusion hole 4 through which a hume tube 2 is passed is provided in the rear wall of the cut-and-cover shield 1, which has a hull structure to prevent the collapse of earth and sand, and a hole 4 is provided in the front wall between it and the hume tube 2 at the forefront end. A plurality of intervening propulsion jacks 3 are installed. A beam 6 is fixed to the front and rear portions of the upper end of the cut-and-cut shield 1, respectively, and rollers 7 are rotatably attached to the lower portions of both ends of the beam 6. Each roller 7 is supported by a rail 8 installed on the ground.

The humid pipe 2 is buried in the following manner.
That is, the hume tube 2 to be buried in the cut-and-cut shield 1 is suspended, and it is connected to the already buried hume tube inside the cut-and-cut shield 1 by bolts, welding, etc., the propulsion jack 3 is extended, and the hume tube is The excavation shield 1 is moved forward while taking the reaction force at step 2.

When moving the cut-and-cover shield 1 forward, it cannot move forward unless the front side of the cut-and-cover shield 1 is excavated, so excavate from the ground with a shovel 5 or the like in advance to create a groove (space) 10 in which the cut-and-cover shield 1 can move forward. Form it.

The cross-sectional shape of the cut-and-cut shield 1 is, for example, U-shaped with an open top, as shown in FIG. Since excavation by the shovel 5 cannot be carried out in accordance with the U-shape accurately, it is necessary to support the excavation shield 1 from the ground. That is, as described above, the cut-and-cut shield 1 is supported by the rail 8 via the roller 7 attached to the beam 6. This prevents the excavation shield 1 from sinking downward even if the shovel 5 excavates deeper than necessary.

As the cut-and-cut shield 1 is advanced, the space 9 created at the rear of the cut-and-cover shield 1 is filled back with earth and sand excavated in the front and closed. In this way, the Huyum pipes 2 are successively buried underground.
When the forward movement of the cut-and-cut shield 1 for one piece of the hume tube 2 is completed, the hume tube 2 is newly suspended into the cut-and-cut shield 1, and the hume tube 2 that has already been buried is
Connect to. By repeating such operations, the embedding of the hume tube 2 is continued.

As mentioned above, the front part of the cut-and-cover shield 1 has been excavated in advance to form the groove 10.
There is no resistance to propulsion at the front of the cut-and-cover shield 1, and there is earth and sand 11 at the bottom, which acts as resistance.
When the trench shield 1 is propelled, the trench shield 1
It is easier to move towards the side where there is no resistance. That is, the cut-and-cut shield 1 was oriented upward, making it difficult to bury the humid tube 2 in a predetermined position.

In addition, the excavated groove 10 in front of the excavated shield 1
Even if the excavation is done in accordance with the cross-sectional shape of the cut-and-cover shield 1, since there is no earth retaining on the side wall of the excavated trench 10, the side wall may often collapse as shown in section A in Fig. 2, creating a dangerous situation. accompanies it.

The object of the present invention is to provide a cut-and-cut shield device that can eliminate the above-mentioned drawbacks.

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 3 and 4. In both figures, the same reference numerals as in Figures 1 and 2 refer to the same items.
or something equivalent.

A lower bulkhead 12 is fixed to the front lower edge of the U-shaped cut-and-cut shield 1 having a semicircular lower edge, and an upper bulkhead 22 is fixed to the upper edge. Support members 30 and 31 are installed in the middle part. A turning ring 13 having a gear provided on a rotating part on the outer periphery is attached to the lower partition wall 12, and a support frame 14 of a lower cutting wheel 15 is fixed to the rotating part. The support frame 14 has holes 20 for passing earth excavated in its outer part.
is provided. The lower cutter foil 15 is arranged at the front lower part of the front end of the excavation shield 1,
Its rotation center is made to coincide with the center of the arc of the lower semicircular portion of the cut-and-cut shield 1, and its outer diameter is made to substantially match the outer diameter of the arc.

A pinion 17 is attached to the output shaft of a hydraulic motor 16 attached to the lower bulkhead 12 and meshed with a gear provided on a rotating portion of the swing ring 13. An inner cover 19 is attached between the inner peripheral part of the turning ring 13 and the intermediate part between the support frame 14 and the lower partition wall 12.
An outer cover 18 is attached between the lower part of the shield 9 and the lower front part of the cut-and-cut shield 1. Lower partition wall 12 at the central inner circumference of the inner cover
A screw conveyor 21 is installed between the middle part of the lower bulkhead 12 and the support member 30 to convey the excavated earth and sand into the inside of the excavation shield 1 on the rear side of the lower bulkhead 12. A plurality of propulsion jacks 3 are installed between the member 30 and the member 30 . The outer cover 18 and the inner cover 19 are used to prevent excavated soil from entering drive parts such as the turning wheel 13 and pinion 17, and a seal ( (not shown) is installed.

A housing 25 is fixed to the back side of the upper partition wall 22, and the central axis 23 of the upper cutter foil 24 has approximately the same diameter as the lower cutter foil 15.
It is rotatably supported by bearings 26 and 27 attached to the upper partition wall 22 and the housing 25, respectively. A gear 28 fixed to the central shaft 23 is housed in the housing 25, and this gear 28 is
Pinion 32 attached to the output shaft of hydraulic motor 29
They are interlocked. The hydraulic motor 29 is fixed to the outer wall of the housing 25.

The upper katsuta foil 24 is located above the front of the lower katsuta foil 15 and the lower katsuta foil 15.
The outer periphery of the upper cutter foil 24 protrudes from the ground.

The promotion of the cut-and-cover shield 1 for burying the humid pipe 2 is performed as follows. That is, the hume pipe 2 to be buried in the cut-and-cut shield 1 is suspended, and this is connected to the existing hume pipe 2.
The propulsion jack 3 is extended, and the cut-and-cut shield 1 is advanced while the reaction force is taken by the fume tube 2. As it moves forward, the front face of the excavation shield 1 is excavated by the lower cutter foil 15 and the upper cutter foil 24, and the excavated soil is discharged by the screw conveyor 21. Since excavation is carried out with the lower cutter foil 15 and the upper cutter foil 24 while the excavation shield 1 is propelled by the propulsion jack 3, both cutter foils 15 and 24 are in close contact with the face. The front face of cut-and-cut shield 1 has
There is no space like the conventional one, so Shimogawa Katsuta Foil 1
5 and the upper cutter foil 24, the resistance of the face surface is applied to both the lower and upper parts, and there is no extreme resistance unbalance as in conventional cut-and-cut shields, and the upward orientation of the cut-and-cut shield 1 is eliminated. .

Furthermore, since there is no space on the sides of the cut-and-cut shield 1, the phenomenon of side collapse A, which is conventional, is eliminated.

Note that the excavated earth and sand transported into the cut-and-cut shield 1 is used to fill the space behind the cut-and-cover shield 1.

In the embodiment described above, one cutter foil is provided in each of the upper and lower rows, but more than two cutter foils may be installed in combination.

According to the invention described above, the following effects can be obtained. Since the plurality of upper and lower cutter foils on the front side of the cut-and-cut shield 1 come into close contact with the face, the propulsion resistance at the front of the cut-and-cut shield 1 becomes uniform, so that the cut-and-cut shield 1 can be propelled upwardly or downwardly. Moreover, the direction of the excavation shield 1 can be easily controlled by pushing the propulsion jack 3 on one side. Further, at the front lower edge of the front end of the U-shaped cut-and-cut shield 1 whose lower edge is semicircular, the center of rotation is aligned with the arc center of the semicircle,
A lower cutter foil 15 whose outer diameter is approximately the same as the outer diameter of the arc is arranged, and a portion of the lower cutter foil 15 is overlapped with the lower cutter foil 15 on the front upper side of the lower cutter foil 15 to form a lower cutter foil 15. Since the upper cutter foil 24 of approximately the same diameter is arranged, the face can be excavated over almost the entire surface of the cut-and-cover shield without leaving anything behind, making it easy to propel even in hard soil, and in front of the lower cutter foil 15. Since the upper cutter foil 24 is arranged, the face will be excavated in a shape close to the collapse stability line,
Stable excavation is possible even in soft soil, and since the lower cutter foil 15 and the upper cutter foil 24 overlap and rotate, the excavated soil is agitated and pulverized, making it easier to discharge by the conveying device 21. It has good excavation efficiency.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional side view showing a conventional trenchless shield device, FIG. 2 is a cross-sectional view taken from FIG. 1, FIG. 3 is a cross-sectional side view showing an embodiment of the present invention, and FIG. FIG. 1... Cut-and-cut shield, 2... Huyum tube, 3...
...Propulsion jack, 4...Ejection hole, 12...
Lower bulkhead, 13...Swivel ring, 14...Support frame, 15...Lower cutter foil, 16...Hydraulic motor, 17...Pinion, 18...Lower cover, 19...Inner wall Cover, 20... Hole, 21
... Screw conveyor, 22 ... Upper bulkhead,
23...Central shaft, 24...Upper cutlet foil,
25... Housing, 26... Bearing, 27... Bearing, 28... Gear, 29... Hydraulic motor, 30...
...Support member, 31...Support member, 32...Pinion.

Claims (1)

[Claims] 1. A cut-and-cut shield device comprising the following (a) to (f). (a) A U-shaped cut-and-cut shield with a semi-circular bottom part and a hole for extrusion through which the hume tube is inserted in the rear wall, (b) A propulsion jack that propels the cut-and-cut shield by taking a reaction force to the hume tube, ( c) a lower cutter foil disposed at the front lower side of the front end of the cut-and-cut shield, the center of rotation of which is aligned with the center of the arc of the semicircle, and the outer diameter of which is approximately aligned with the outer diameter of the arc; (d) lower It is placed on the upper front side of the Gawakatsuta foil and partially overlapping the lower side of the Gawakatsuta foil.
An upper Katsuta foil with approximately the same diameter as the lower Katsuta foil, (e) A bulkhead that is fixed in the excavated shield behind the Katsuta foil and rotatably supports the Katsuta foil, (f) A partition wall that is excavated by the Katsuta foil and connects the Katsuta foil with the bulkhead. A conveyance device that transports the sediment taken into the space between the partitions to the rear of the partition wall,