JP3229565B2 - Removal method of double casing auger and underground buried object - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double casing auger suitable for replacing an existing underground object such as a manhole in a short time, a casing auger, and a method of excavating and removing an underground object using the same. About the method. Furthermore, the present invention relates to a soundproof body used during excavation.

[0002]

2. Description of the Related Art An underground object such as a manhole, which has passed aged, is damaged by a load, frost heave, groundwater, corrosion, or the like, and requires repair or replacement. Further, in order to newly branch the pipeline, it is necessary to excavate and expose the connection portion.

[0003] For this reason, under the present circumstances, the area around an underground buried object such as a manhole is excavated, soiled to expose a damaged portion of the manhole, removed, and replaced with a new part. However, this method requires excavation and subsequent earth retaining, so it takes two to four hours before the manhole replacement work is completed.
It took ~ 4 days, during which time roads had to be restricted.

[0004]

In the conventional method for replacing manholes, the occupation period of the road required for the replacement work is long, which affects traffic and is inconvenient. Therefore, the applicant of the present application has proposed an underground burial replacement method in which a double casing is used to occupy the road as short as possible.

The present invention further seeks to systematize excavation, earth removal and removal and replacement of underground buried objects, including cutting and removal of pavement slabs.

[0006]

A double casing consisting of an inner casing and an outer casing is connectable and disengageable. The outer casing has a cutting bit at a lower end and the inner casing has a soil discharging function. By doing so, it is possible to safely and quickly complete the removal and removal of the pavement slab, excavation of the surrounding ground, and removal and replacement of underground buried objects.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment A double casing auger and a casing auger according to the present invention will be described with reference to FIGS. The double casing auger includes an outer casing 1 and an inner casing 2. When both casings are connected by the drive plate 3, they rotate together. When the connection is released, both can be used alone. The outer casing 1 can be used as a pavement slab cutter or as an earth retaining casing.
Can be used alone as a drilling auger.

At the lower end of the outer casing 1, bits 11 such as a carbide bit or a diamond bit for cutting a pavement slab are provided at appropriate intervals over the entire circumference. At the upper outer peripheral portion of the outer casing 1, four connecting tools 41 for connecting to the inner casing 2 are provided at intervals of 90 degrees. The number of the connecting tools 41 is determined according to the magnitude of the torque to be transmitted and the strength of the members.

The connecting member 41 of the outer casing 1
The steel plates are welded in parallel, and a screw hole for inserting a pin 44 for preventing the L-shaped connecting plate 43 from coming off is provided. A circular driving plate 5 is fixed at the center of the driving plate 3, and a coupler 51 having a square hole into which a rotary driving shaft is inserted is fixed at the center. A portion of the drive plate 3 corresponding to the connecting member 41 of the outer casing 1 protrudes into a sector 52, and a connecting member 42 having a slit 53 is provided at this portion. When the two casings are connected and integrated, the inner casing 2 is put in the outer casing 1, the drive plate 3 is fixed to the inner casing 2 with bolts 54, the positions of the connecting tools 41 and 42 are adjusted, and the slit of the connecting tool 42 is formed. An L-shaped connecting plate 43 is inserted into the connecting member 53 to prevent the connecting plate 43 from coming off. The rotation of the inner casing 2 is transmitted to the outer casing 1 via the L-shaped connecting plate 43, and the two rotate integrally.

A reinforcing plate 21 is welded to the inner periphery of the upper end of the inner casing 2. At the lower end of the inner casing 2, a bit 12 for mainly excavating earth and sand is provided. A plurality of spiral blades 61 are provided on the outer peripheral surface of the inner casing 2 to discharge excavated earth and sand upward.
The plurality of spiral blades 61 are provided at appropriate intervals. The number of the spiral blades 61 is changed according to the soil quality, and is determined so that the earth and sand can be efficiently discharged.

A bit 13 extending in the direction of extension of the spiral is provided at the tip of the spiral blade 61, and excavates earth and sand on the front surface in the rotational direction as the inner casing 2 rotates. The width of the spiral blade 61 is slightly smaller than the distance between the outer casing 1 and the inner casing 2 so that the inner casing 2 does not contact the outer casing 1 when the inner casing 2 rotates alone in the outer casing 1.
Similarly, the spiral blade 62 is provided on the inner peripheral surface of the inner casing 2.
To further enhance the soil removal efficiency.

Since most of the excavated earth and sand is discharged by the spiral blades 61 on the outer peripheral surface, the spiral blades 62 on the inner peripheral surface are not provided to the upper end of the inner casing 2 but extend to the intermediate portion of the inner casing. 62 are provided. The spiral blade 62 may be provided over the entire length of the inner casing 2.

The inner casing 2 having spiral wings 61 and 62 on the inner and outer circumferences is used for excavating and removing an underground buried object. When there is no underground buried object, for example, a pipe is dug out.
In order to perform work such as inspection, the inner casing 2
Has a structure as shown in FIG.

A bit 12 is provided at the lower end of the inner casing 2. Excavation blades 15 are provided on the bottom surface at appropriate intervals. A space 16 for taking excavated earth and sand into the inner casing 2 is provided between the excavation blades, and the other is closed and sediment excavated by the excavation blade 15 is taken into the inner casing 2 and stored therein. You. Depending on the soil, the bit 12 at the lower end can be omitted.

A spiral blade 6 is provided on the inner and outer circumferences of the inner casing 2.
The one provided with 1, 62 forms a hole in a ring shape,
The one provided with the excavation blade at the bottom forms a hole whose diameter is the casing. As another modified example, as shown in FIG.
5, the inner casing 2 can be prevented from vibrating or oscillating during excavation of earth and sand. The guide pole 55 is detachable.

Description of Construction Method A construction example using a double casing auger will be described with reference to a case where a sloping wall portion of a manhole is removed. The machinery used for construction will be described. The above-mentioned double casing auger is rotationally driven by using a driving device for a crane which is mounted on a vehicle and shown in FIG. In addition, the casing is moved to a construction site by a crane attached to the boom. The drive is
By connecting two reduction gears in series, it is possible to easily change the rotation speed when cutting the pavement slab and when excavating earth and sand. Further, the rotation speed can be adjusted by other appropriate means.

FIG. 9 shows a circular ruler for defining the cutting position of the auger casing and a soundproof cover for reducing noise when cutting the pavement slab. The soundproof cover 74 is composed of two boxes and can be moved on the rails 75 provided on the frame. When combined, the soundproof cover 74 completely covers the double casing auger, and reduces noise when cutting the pavement slab or excavating and discharging. It is. The soundproof cover 74 is made of damping steel or a steel material in which damping material is sandwiched. The soundproof cover 74 is provided with a semicircular notch 76 for allowing the drive shaft of the double casing auger to pass therethrough. In order to prevent noise from leaking from the gap between the semicircular notch 76 and the drive shaft, a rubber seal 77 is provided in the semicircular notch 76, and the rubber seal 77 is in close contact with the drive shaft, and the notch 76 of the soundproof cover 74 is provided. Prevents sound leakage from According to the position of the manhole to be removed,
A frame 70 having a circular ruler hole 71 in the center is driven into the road surface by an anchor and fixed with bolts 72.

FIG. 6 shows the removal procedure. When cutting the pavement slab, the drive plate 3 is removed from the inner casing 2 because the inner casing 2 is unnecessary. The drive plate 3 is connected to the outer casing 1 by connecting tools 41 and 42 and an L-shaped connecting tool 43. The drive shaft of the in-vehicle drive device is inserted and fixed in the coupler 51 of the drive plate 3, and the outer casing 1 is installed in accordance with the circular ruler hole 71. The soundproof cover 74 is closed, the outer casing 1 is rotationally driven by the driving device, and the paved road slab is cut by the bit 11 at the lower end to a diameter slightly larger than the diameter of the straight wall of the manhole. At the time of cutting, water is supplied to the bit 11 to prevent the bit from overheating. (See Fig. 6 (1))

When cutting of the pavement slab is completed, the soundproof cover 74 is opened, and the outer casing 1 is once lifted and moved. Then, the cutting debris generated at the time of cutting is cleaned, a hydraulic breaker is cut into the lower part of the manhole cover receiving frame 85, the receiving frame and the sloping wall 81 are separated, and the manhole cover receiving frame 85 together with the surrounding pavement slab 9 is cut. And remove it.
(For the specific method of removal, see JP-B-61-25844.
No., JP-B-61-33938) (see FIG. 6).
(See (2))

The inner casing 2 is inserted into the outer casing 1, the drive plate 3 is fixed to the inner casing 2, and the connecting fittings 41, 42 and the connecting plate 43
And connect them together. The bentonite muddy water or water is sprayed on the exposed soil surface of the concave portion after the removal of the pavement slab 9 so as to serve as a lubricant at the time of excavation so that the soil can be discharged smoothly. The integrated inner casing 2 and outer casing 1 are rotationally driven to excavate and discharge earth and sand around the manhole.

At the time of excavation, water is supplied to the bits 11, 12, 13 and the spiral blades 61, 62 to prevent earth and sand from adhering to the spiral blades 61, 62. The earth and sand is the outer casing 1
And a bit 11 provided at the lower end of the inner casing 2,
12, the inner and outer spiral blades 61 cut by a bit 13 provided at the tip of the spiral blade and provided on the inner casing 2;
The soil is discharged upward by 62.

When the double casing auger is lowered to a predetermined depth of about 1/3, the rotation is stopped, the L-shaped connecting member 43 is removed, and the connection between the two casings is released. Lift the inner casing 2 from the outer casing,
The excavated earth and sand clogged in the spiral blades 61 and 62 is removed.

Further, while the outer casing 1 is submerged in the ground, only the inner casing 2 is rotationally driven to continue excavation and discharge. The clearance between the spiral blades 61, 62 of the inner casing 2 and the outer casing 1 is small, and when the earth and sand at the lower end of the outer casing is excavated, the outer casing 1 sinks as the earth is discharged. (See Fig. 6 (3))

When the inclined wall portion of the manhole to be removed is exposed, the rotation drive of the inner casing 2 is stopped,
The inner casing 2 is pulled up so that the inclined wall of the manhole is exposed inside the outer casing 1. At this time, the outer casing 1 functions as an earth retaining member. (FIG. 6
(See (4))

At the joint between the inclined wall 81 and the straight wall 82 of the manhole, a hydraulic rupture machine is cut into the seam to release the joint.
Is lifted by a crane and removed. The removal of the sloping wall 81 is performed by using a hanging tool engaged with the inside of the sloping wall 81, or by wrapping a belt around the sloping wall 81 and using a chain block or a crane. (See Fig. 6 (5))

Backfilling of the subgrade and subbase is performed, a receiving frame is installed at the upper end of the new slope, and the removed subbase is filled with mortar and the surrounding area is rolled up so that there is no step with the road surface. Press. Finally, the soundproof cover is removed to complete the construction.

[0027]

According to the present invention, a double casing auger composed of an outer casing and an inner casing having a soil discharging mechanism is used, so that cutting of the pavement slab and removal of earth and sand around the underground buried object can be performed by one machine. The outer casing cuts the pavement slab, trims the underground buried object and the surrounding ground, and performs earth retaining.Therefore, no separate earth retaining work is required, the construction speed is increased, and removal and replacement work of the underground buried object is performed. It can be completed in a short time. Therefore, there is an advantage that the time for occupying the road and restricting traffic is short.

[Brief description of the drawings]

FIG. 1 is a perspective view of a double casing auger.

FIG. 2 is a perspective view of an inner casing.

FIG. 3 is a plan view of a double casing auger.

FIG. 4 is a bottom view of the double casing auger.

FIG. 5 shows an embodiment of a vehicle-mounted base machine having a double casing auger.

FIG. 6 is a construction procedure diagram of manhole slope wall removal.

FIG. 7 is an embodiment of an inner casing having a cutting edge at the bottom.

FIG. 8 is an embodiment of an inner casing having a guide.

FIG. 9 shows an embodiment of a soundproof body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer casing 2 Inner casing 3 Drive plate 11, 12, 13 bits 15 Excavation blade 16 Space 41, 42 Connector 43 L-shaped connection plate 5 Drive plate 53 Slit 61, 62 Spiral wing 70 Frame 74 Soundproof cover 75 Rail 76 Semicircular notch 80 manhole

Continuation of the front page (72) Inventor Shinichi Tsubakimori 1-1-1, Minami-Dainichicho, Kanshuji, Yamashina-ku, Kyoto, Kyoto, Japan (56) References JP-A-4-231519 (JP, A) Jpn. JP, U) JP-B 63-23352 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) E21B 7/00 E21B 7/20

Claims (17)

(57) [Claims] 1. A double casing comprising an inner casing and an outer casing, which is rotatably driven by a drive plate, wherein the drive plate and the outer casing are
It can be connected and released by a connecting tool and an L-shaped connecting plate, the outer casing has a bit at a lower end,
The inner casing is a double casing auger with a soil removal mechanism. 2. The double casing auger according to claim 1, wherein the bits of the outer casing are either carbide bits or diamond bits. 3. A double casing auger according to claim 1, wherein spiral wings are provided outside the inner casing. 4. The double casing auger according to claim 3, wherein a plurality of spiral blades are provided. 5. The double casing auger according to claim 3, wherein a bit is provided at a tip of the spiral blade. 6. A double casing auger according to any one of claims 1 to 5, wherein the casing has a spiral blade inside the inner casing. 7. The double casing auger according to claim 6, wherein a plurality of spiral blades inside the inner casing are provided. 8. A double casing auger according to claim 6, wherein the spiral blade of the inner casing is provided only at a lower portion of the casing. 9. A double casing auger according to claim 1, wherein a drilling blade is provided at the bottom of the inner casing. 10. The double casing auger according to claim 1, wherein a guide for steadying is provided at the center of the inner casing. 11. The double casing auger according to claim 1, wherein a plurality of speed reducers are provided in series on the drive shaft. 12. A pavement slab is cut and removed with the outer casing of the double casing auger, the inner casing is connected to the outer casing, and both are rotated to discharge earth and sand, and one of the double casing augers is placed underground. Excavation method in which a part is laid down, and furthermore, the connection between both casings is released, and only the inner casing is rotated to discharge earth and sand. 13. The excavation method according to claim 12, wherein water is supplied at the time of cutting and excavation to smooth the cutting and discharging. 14. A pavement slab above an underground buried object is cut and removed with a double casing outer casing, and an inner casing is connected to the outer casing, and both are rotated to discharge earth and sand, thereby removing the earth and sand. A method of removing underground buried objects by laying down a part of the heavy casing auger, releasing the connection between the two casings, rotating only the inner casing to remove earth and sand, exposing and removing the underground buried objects. 15. The method of removing underground buried objects according to claim 14, wherein a soundproof body is provided at the time of cutting the pavement slab. 16. The method according to claim 14, wherein
A method of removing an underground buried object by installing a circular ruler hole in the pavement slab and using this as a guide to cut and excavate the pavement slab. 17. A soundproof body comprising a frame having a circular ruler hole in the center and two covers movable on the frame, and the covers are combined to cover the circular ruler hole.