JPH0258406B2 - - Google Patents

Description

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

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

The rear wall of the cut-and-cover shield 1, which has a hull structure to prevent the collapse of earth and sand, is provided with a through hole 4 through which the hume pipe 2 is passed, and the front wall has a hole 4 between it and the hume pipe 2 at the forefront end. A plurality of 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 excavation 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.

Further, the excavation shield 1 has a hull structure, and receives the buoyancy of groundwater or earth and sand that accumulates in the excavation space (trench) 10, and for this reason also tends to float up as it moves forward. There may be cases where it cannot be buried.

The side wall of the front space 10 collapses as shown in section A in FIG. 2, posing a danger to work, and the space 9 created at the rear also poses a similar danger. Rear space 9
is backfilled with excavated soil or pre-prepared soil as the excavated shield 1 moves forward, so it can be said that the degree of collapse of the side wall is less than in the front space 10. However, with the method of dropping soil from the ground, There is an inconvenience that it is not possible to sufficiently backfill the bottom with earth and sand, and the hump pipe 2 sinks over time.

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 explained 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.

The cross-sectional shape of the lower side of the cut-and-cut shield 1 is an occluded circle with the upper side missing, and the cross-sectional shape of the upper side is almost rectangular, which is connected to the lower side. The width of the lower edge is set larger than the width of the upper edge. A lower partition wall 12 is fixed to the lower part of the front part of the trench shield 1, an upper partition wall 13 is fixed to the upper part, and a support member 14, 15 is fixed. A turning ring 16 having a gear provided on a rotating portion on the outer periphery is attached to the lower partition wall 12, and a support frame 18 for a lower cutting wheel 17 is fixed to the rotating portion. The support frame 18 is provided with holes 19 through which earth and sand are excavated in its outer part.

A pinion 21 is attached to the output shaft of a hydraulic motor 20 attached to the lower bulkhead 12 and meshed with a gear provided on a rotating portion of the swing ring 16. An inner cover 22 is attached between the inner peripheral part of the turning ring 16 and the intermediate part between the support frame 18 and the lower partition wall 12.
An outer cover 23 is attached between the lower part of the shield 2 and the lower front part of the cut-and-cut shield 1. Between the middle part of the lower bulkhead 12 and the support member 14 on the central inner circumferential side of the inner cover 22, the excavated earth and sand is transported into the cut-and-cover shield 1 on the rear side of the lower bulkhead 12. screw conveyor 24
are installed, the lower bulkhead 12 and the support member 1
4, a plurality of propulsion jacks 3 are installed. The outer cover 23 and the inner cover 22 are
This is to prevent excavated earth and sand from entering drive parts such as the swing ring 16 and pinion 21, and a seal (not shown) is attached to the part that comes into contact with the rotating support frame 18.

A housing 25 is fixed to the back side of the upper bulkhead 13, and a central shaft 27 of the upper cutter foil 26 is rotatably supported by bearings 28 and 29 attached to the upper bulkhead 13 and the housing 25, respectively. has been done. Gear 30 fixed to central shaft 27
is housed in a housing 25, and this gear 30 meshes with a pinion 32 attached to the output shaft of a hydraulic motor 31. The hydraulic motor 31 is fixed to the outer wall of the housing 25.

The lower cutter foil 17 is arranged at the front lower part of the front end of the cut-and-cut shield 1, its rotation center is aligned with the arc center of the lower cut-out circular part of the cut-and-cut shield 1, and its outer diameter is the same as the lower cutout. It is made to almost match the arc diameter of the circular part. The upper cutter foil 26 is disposed above and in front of the lower cutter foil 17, partially overlapping the lower cutter foil 17, and has an outer diameter larger than the outer diameter of the hump tube 2.
It is smaller than the outer diameter of the lower cutter foil 17, and its outer periphery protrudes from the ground. A cover 33 is attached to the upper end of the upper bulkhead 13 to prevent earth and sand excavated by the upper cutter foil 26 from climbing over the bulkhead 13 and entering the excavation shield 1.
covers the upper cutlet foil 26.

An earth and sand pump 35 such as a concrete pump is installed at the earth discharge port 34 of the screw conveyor 24, and a delivery pipe 36 for sending the excavated earth to the rear of the excavation shield 1 is installed at the discharge port. connected. The delivery pipes 36 are arranged at the upper and lower ends of the hume pipe 2.

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 is suspended into the cut-and-cut shield 1 and connected to the existing hume pipe 2. Then, the front face of the excavation shield 1 is excavated with the lower cutter foil 17 and the upper cutter foil 26, and the excavated earth and sand are removed from the upper bulkhead 13 and the lower bulkhead 1.
2 and a cover 33, and the excavated earth and sand are discharged by the screw conveyor 24 while pressing the face with the earth and sand to prevent collapse.

While performing the above-mentioned excavation operation, the reaction force is taken by the fume tube 2, the propulsion jack 3 is extended, and the excavation shield 1 is advanced. Along with this, the extrusion hole 4 of the cut-and-cut shield 1 slides forward along the connected hume pipe 2. After propelling one hume tube, the propulsion jack 3 is shortened, the hume tube 2 is newly suspended in the excavation shield 1 and connected to the buried hume tube, and the next excavation and excavation process is started. By repeating such operations, the hume tubes 2 are successively buried.

The excavated earth and sand discharged by the screw conveyor 24 is pumped by an earth-filling pump 35, and is sent out through a delivery pipe 36 into a space created at the rear as the excavation shield 1 moves forward, and fills the space. As a result, the humid pipe is buried underground at the same time as the cut-and-cut shield 1 moves forward.

According to the invention described above, the following effects can be obtained. In other words, the center of rotation is aligned with the arc center of the lower front edge of the cut-and-cut shield, which has a cut-out circular shape with a chipped upper edge, and the outer diameter is made to almost match the arc diameter of the missing circle. The installation of the Tashigawa Katsuta foil reduces digging resistance and improves digging efficiency. Also, on the front upper side of the lower-gawa katsuta foil, overlap a part of the lower-gawa katsuta foil,
Since the upper cutter foil with an outer diameter larger than the outer diameter of the humid pipe and smaller than the outer diameter of the lower cutoff foil is placed, during excavation work, the boundary between the lower and upper parts of the excavation shield ( The earth and sand in part B in Figure 4 acts as resistance, and prevents the excavated shield from moving upward due to buoyancy, making it possible to propel it accurately and making it easy to install the hump pipe in the correct position. can. Furthermore, the excavated earth and sand is pumped by the pumping means, and the trailing space created as the excavated shield advances is immediately filled and backfilled to every corner of the bottom, so there is no danger of the trailing trench collapsing, and it is safe. Able to work efficiently. Moreover, the bottom of the Huyum pipe buried in the rear is also filled with excavated earth and sand.
This can prevent buried hume pipes from sinking.

[Brief explanation of the drawing]

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... Upper bulkhead, 14... Support member, 15... Support member, 16... Swivel ring, 17
... Lower cutter wheel, 18 ... Support frame, 20 ... Hydraulic motor, 21 ... Pinion, 2
2...Inner cover, 23...Outer cover, 2
4...Screw conveyor, 25...Housing, 26...Upper cutter foil, 27...Center shaft, 28...Bearing, 29...Bearing, 30...Gear, 31...Hydraulic motor, 32... pinion, 3
3...cover, 34...earth discharge port, 35...earth pressure pump, 36...delivery pipe.

Claims (1)

[Scope of Claims] 1. A cut-and-cut shield device comprising the following (a) to (f). (a) A cut-and-cut shield with an extrusion hole in the rear wall for passing the fume tube through, and a cut-and-cut shield with a cross-sectional shape of a cut-out circle at the bottom, and (b) a support member inside the cut-and-cover shield. (c) A propulsion jack that is interposed between the frontmost hume tube and propels the cut-and-cut shield by applying a reaction force to the hume tube; A lower edge katsuta foil whose outer diameter is aligned with the center of the arc of the cutout circle, and whose outer diameter is approximately the same as the arc diameter of the cutout circle. Placed with parts overlapping each other,
An upper katsuta foil with an outer diameter larger than the outer diameter of the hump tube and smaller than the outer diameter of the lower katsuta foil, (e) a bulkhead fixed in the cut-and-cut shield behind the katsuta foil and rotatably supporting the katsuta foil, ( f) Sediment excavated by the Katsuta foil and taken into the space between the Katsuta foil and the bulkhead,
a pumping means for pumping and filling a space formed behind the cut-and-cut shield as it is propelled;