JPH0258407B2 - - 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.

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 an extrusion hole 4 through which the hume tube 2 is passed, and the front wall has a hole 4 between it and the hume tube 2 at the frontmost 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 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 too deeply 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 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 part 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 part. The support frame 18 is provided with holes 19 through which the excavated earth and sand can pass 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 soil 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 the 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 set at 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 its outer diameter is 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.

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. The space behind is formed as the cut-and-cover shield 1 moves forward, burying the fume pipes 2 one after another by repeating these operations.
Backfill with excavated soil or pre-prepared soil.

Although the embodiment of this invention has been described in which one cutter foil is installed in each of the upper and lower rows, the number of cutter foils may be more than two.

According to the invention described above, the following effects can be obtained. In other words, the center of rotation was made to coincide with the arc center of the lower front part of the cut-and-cut shield, which has a cut-out circular shape with a chipped upper part, and the outer diameter was made to almost match the arc diameter of the missing part. The arrangement of the lower cutter foil reduces excavation resistance and improves excavation efficiency. In addition, the width of the upper part of the cut-and-cut shield is made smaller than the width of the lower part, and a part of the shield is overlapped with the front upper part of the lower cutter foil and the lower cutter foil, so that the outer diameter of the humid pipe is Since the upper cutter foil is large and has an outer diameter smaller than the outer diameter of the lower cutter foil, during excavation work, the boundary between the lower and upper sides of the excavation shield (section B in Figure 4) is placed. ) acts as resistance and prevents the cut-and-cut shield from moving upward due to buoyancy, making it possible to propel the shield accurately and making it easy to install the hump pipe in the correct position.

[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.

Claims (1)

[Scope of Claims] 1. A cut-and-cut shield device comprising the following (a) to (f). (a) An extrusion hole is provided in the rear wall for passing the fume tube, the cross-sectional shape of the lower side is made into an elliptical shape with the upper side missing, and the cross-sectional shape of the upper side is changed to the lower side. (b) a cut-and-cut shield that is substantially rectangular in shape and whose lower side is wider than the upper side; (c) a propulsion jack for propelling the cut-and-cut shield by applying a reaction force to the humid pipe; (c) a propulsion jack disposed at the front lower part of the front end of the cut-and-cut shield, the center of rotation being aligned with the arc center of the lower cutout circular part; (d) A lower-gawa katsuta foil whose outer diameter is approximately the same as the arc diameter of the missing circular portion;
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,
An unloading device that unloads to the rear interior divided by a partition wall,