JPH10331567A - Excavating jig for sunk well - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably excavate by increasing the strength of a blade. SOLUTION: An excavating jig 1 has a ring element 2 covering the end of a cylinder 43, and has an excavating blade 3 at the end of the ring element 2. The excavating blade 3 includes a steel ring part 11 made of steel which is connected to the ring element 2 and an inside inclined part 12 made of steel, with concrete 28 packed between the ring part 11 and the inside inclined part 12. The blade 3 is excellent in strength because it is made of complex materials such that a concrete part is provided inside a steel part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a well drilling jig used for drilling a tubular body such as a catchment well.

[0002]

2. Description of the Related Art Conventionally, a drilling jig of this type is used in a well setting method or the like. In this well setting method, a cylindrical body in which a plurality of segments are assembled into a cylindrical shape is used as a blade of the drilling jig. The excavation is performed by placing the cylinder on its own weight or by applying weight from above. In addition, a jack is arranged between the tip of the cylindrical body and the blade body, the excavating jig is settled by the extension of the jack, and after settling, a new segment is assembled in a gap from which the jack is removed. There is known a method in which a jack is arranged between the segment assembled in the above and the blade body, and excavation is sequentially performed.

In the drilling jig used for such a large well tube, the blade at the tip is formed by assembling a plurality of divided concrete blocks in the circumferential direction, so that cracks and damages occur during drilling, and the blade is damaged. However, there is a problem that the excavation resistance increases and the excavation cannot be performed deeply.

Accordingly, an object of the present invention is to provide a well drilling jig capable of performing stable and stable drilling with high strength of a blade body.

[0005]

According to the first aspect of the present invention, there is provided a ring for covering a distal end of a well buried underground, and a drilling blade provided at the distal end of the ring for excavating a well. In the jig, the blade is made of metal, so that the blade is less likely to be cracked or damaged, and the excavation resistance is reduced.

According to a second aspect of the present invention, the excavating blade includes a steel ring portion connected to the ring body, and a steel inner inclined portion. Since the blade is made of a composite material having a concrete portion inside a steel portion, the blade is excellent in strength and can be manufactured at low cost.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIGS. 1 to 7 show a first embodiment of the present invention. A drilling jig 1 includes a steel link body 2 and a steel drilling blade body 3 integrally provided at the tip of the ring body 2. Consists of Further, in this example, the excavating blade body 3
As shown in the figure, the divided bodies 4 and 4 obtained by dividing the excavating blade body 3 into two in the circumferential direction are integrally assembled.

The ring body 2 has a plurality of reinforcing frame members 6 and a circumferential reinforcing member 6A integrally provided on the inner surface of an outer peripheral plate 5, and as shown in FIG. An elastic sealing member 7 such as a packing is provided on the upper surface of the reinforcing member 6A.
The elastic sealing member 7 is provided over the entire length in the circumferential direction, and its inner end is in contact with an outer surface of a cylindrical body described later. FIG. 4 is a drawing in which the cylindrical divided body 4 of the excavating jig is developed in a plane.

The blade body 3 has a ring portion 11 having the same diameter as the outer peripheral plate 5. In this example, the distal end side of the outer peripheral member 5 forms the ring portion 11. Inside the ring portion 11, an inner inclined portion 12 is provided, and the tips of the ring portion 11 and the inner inclined portion 12 are fixed to a flat tip portion 13.
13 is formed thicker than the ring portion 11 and the inner inclined portion 12. Further, a ring-shaped rising portion 14 is integrally provided at a base end of the inner inclined portion 12, and a receiving surface portion 15 is integrally provided at a base end of the rising portion 14. A plurality of longitudinal reinforcing plates 16 are provided at substantially equal intervals in the circumferential direction inside the blade body 2.
A mounting portion 17 that is fixed to the inner surface of the base member extends to the base end side.
Also, a triangular hole 18 is formed in the reinforcing plate 16 and the hole 18
Reinforcing bars 19, 19, 19 are inserted through the inside of the heat conduction portion, and the reinforcing plate 16 and the reinforcing bar 19 are fixed at necessary places. Further, a plurality of reinforcing reinforcing bars 20 connecting the receiving surface portion 15 and the ring portion 11 are provided radially at intervals in the circumferential direction.

The receiving surface portion 15 is provided with connection holes 21 as connection portions for connecting segments described later, and the excavating jig 1 of this example is provided with 18 connection holes 21. Also,
An opening is formed above the rising portion 14 corresponding to the connection hole 21.
22 is formed, and a space below the connection hole 21 is closed by a bottom plate 23 and a frame plate 24. As shown in FIG. 4, a plurality of holes 25 are formed in one circumferential edge of the outer peripheral plate 5 of the divided body 4, and an edge plate is formed on the inner surface of the other side edge of the outer peripheral plate 5 of the divided body 4. 26 is fixed, and a plurality of holes 27 are formed in the edge plate 26. The holes 25 and 27 are provided at corresponding positions. And
The divided bodies 4 and 4 are circumferentially aligned, and the holes 25 and 27 are aligned.
A bolt (not shown) is inserted into the hole, a nut (not shown) is screwed into the hole, and if necessary, the divided bodies 4 and 4 are welded to assemble the excavating jig 1. The blade body 3 of the jig 1 is filled with concrete 28 from the upper opening thereof, and the upper surface of the concrete 28 is finished almost flush with the receiving surface portion 15.

Next, a method of forming a well using the above-mentioned excavating jig will be described. A plurality of concrete segments 31 are formed in a ring shape by assembling a plurality of segments 31 in a circumferential direction, and are formed in an arc shape. ing. As shown in FIGS. 6 and 7, a vertical recess 32 is formed on the inner surface of the segment 31, and a vertical connecting member 33 is embedded outside the recess 32, and the connecting member 33 is made of steel. And upper and lower collars
Connection holes 35, 35 are formed in 34, 34, and these connection holes 35, 35 communicate with the upper and lower surfaces of the segment 31, respectively. The connection holes 35 are provided corresponding to the connection holes 21 of the blade body 3. A circumferential connecting member 36 is provided on the inner surface of the circumferential edge of the segment 31.
36, a plurality of rebars 38 are provided on a body 37 made of steel and made of an angle or the like, and the rebars 38 are embedded and fixed in the segments 31 and connection holes 39 for connecting to each other are formed in the main body 37.
A plurality of holes are drilled.

When assembling the segments 31 in the circumferential direction, the connection holes 39, 39 are aligned, the bolts 40 are inserted into the connection holes 39, 39, and the nut 41 is tightened to form the ring frame 42. When assembling the ring frame 42 in the vertical direction, the connection holes 35 of the vertically adjacent segments 31 are aligned, bolts 40 are inserted into the connection holes 35, 35, and nuts 41 are tightened and fixed. Then, a cylindrical body 43 to be a well is formed. For example, the ring frame 42 is formed by six segments 31, and the connection portions in the circumferential direction of the segments 31 are shifted in the upper and lower ring frames 42. The excavating jig 1 is arranged at the tip of the cylindrical body 43. Then, the excavation is performed by the own weight of the cylindrical body 43 or the weight from above. Alternatively, the upper part of the cylindrical body 43 is fixed to the hole 45, and as shown in FIG.
A plurality of jacks 44 are arranged between the concave portion 46 of the segment 31 at the tip of the cylindrical body 43 and the receiving surface portion 15, and when these jacks 44 are extended, the drilling jig 1 descends and the hole 45 is dug. To go. Then, the jack 44 is extended, and the interval between the recess 46 and the receiving surface portion 15 is ensured to be equal to or greater than the height of the segment 31 and the height of the jack 44 in the contracted state. Thereafter, the jack 44 is contracted and removed, and at the tip of the cylindrical body 43,
Along with newly forming the segment 31 to form the ring frame 42, the ring frame 42 is fixed to the tip of the cylindrical body 43, and between the recess 46 and the receiving surface portion 15 of this newly assembled ring frame 42, The jack 44 in the contracted state is arranged, the jack 44 is extended, the drilling jig 1 is dug down, the above-described steps are repeated, and the jack 44 is dug to a predetermined depth. Finally, the jack 44 is lowered to a height at which the segment 31 can be inserted. It extends and forms the segment 31 between the distal end surface of the cylinder 43 and the receiving surface portion 15 to form the lowermost ring frame 42, and attaches the upper part of the lowermost ring frame 42 to the cylinder 43.
And the lower part is fixed to the blade body 3. In this case, the bolt 40 is inserted into the connection hole 35 of the segment 31 and the connection hole 21 of the receiving surface portion 15 and the nut 41 is tightened, so that the lowermost portion of the cylindrical body 43 and the blade body 3 are fixed. The bottom of the cylindrical body 43 is closed with cast-in-place concrete (not shown).
When the hole 45 is excavated by the blade 3, the blade 3 is made of steel and has a structure in which the concrete 28 is filled therein. Excavation resistance is smaller than that exposed in

As described above, in the present embodiment, the ring body 2 covering the distal end side of the well tube buried underground corresponds to the first aspect.
And a drilling jig provided with an excavating blade body 3 provided at the tip of the ring body 2, the blade body 3 is made of metal, so that the blade body is hardly cracked or damaged. In addition, the excavation resistance is reduced, and stable excavation work can be performed.

As described above, according to the present embodiment, claim 2
The blade body 3 includes a steel ring portion 11 connected to the ring body 2 and a steel inner inclined portion 12.
Since the concrete 28 is filled between the inner part 11 and the inner inclined part 12, the blade body 3 is made of a composite material having a concrete part inside a steel part. Can be manufactured.

Further, as an effect of the embodiment, the ring body 2 which is reinforced with the reinforcing frame members 6 and 6A, and which has an increased soil thickness, is provided.
Can be improved in strength. Further, by providing an elastic seal member 7 for closing the gap between the cylindrical body 43 and the ring body 2 above the excavating jig 1, it is possible to prevent intrusion of earth and sand, water, and the like from the gap. In addition, by providing a flat tip portion 13 having a substantially constant width at the tip of the blade body 3,
The strength of the tip can be improved. In addition, since the reinforcing bar 16 provided inside the blade body 3 is inserted with the reinforcing bar 19 in the circumferential direction, the steel part outside the blade body 3 and the concrete 28 are integrated. Further, since the reinforcing reinforcing bar 20 is arranged between the receiving surface portion 15 inside the blade body 3 and the ring portion 11 outside the blade body 3, the strength against the deformation of the blade body 3 in the width direction is improved. improves. Further, since the blade body 3 is provided with the connection hole 21,
After the excavation, the tubular body 43 and the excavating jig 1 can be integrated by the bolts 40 and the nuts 41 as connecting members. In the circumferential connection of the segments 31, the connecting member
Since 36 protrudes inward, the work can be easily performed. Further, since the excavating jig 1 is formed by combining the plurality of divided bodies 4 and 4, a large excavating jig 1 is formed.
Can be manufactured. Further, since the opening 22 is provided below the connection hole 21, the operation of the bolt 40 and the nut 41 is easy. Further, the tip of the reinforcing member 6 extends to the inside of the outer peripheral plate 5 and is welded, and the tip is buried in the concrete 28. Since it is fixed to the inner surface of the plate 5, the blade body 3 and the ring body 2 can be firmly integrated. FIG. 8 shows a second embodiment of the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. 2 and the outer peripheral plate 5 are integrated by welding.
This embodiment also has the same operation and effect as the first embodiment.

The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the present invention. For example, the shape of the blade can be appropriately selected. Further, the blade body is not limited to steel, but may be iron. If the metal is harder than concrete and has strength, it is possible to reduce excavation resistance and improve strength. Further, in the embodiment, the divided body is obtained by dividing the excavating jig into two parts, but may be divided into three parts or four parts.

[0017]

According to a first aspect of the present invention, there is provided a jig for excavating a well, comprising: a ring body for covering a tip side of a well tube buried underground; and a drilling blade body provided at the tip of the ring body. The present invention provides a jig for excavating a well which is made of a metal, and is hardly cracked or damaged in the blade, and has a small excavation resistance. can do.

Further, the invention of claim 2 is characterized in that the excavating blade body includes a steel ring portion connected to the ring body, and a steel inner inclined portion, and a gap between the ring portion and the inner inclined portion. The blade is made of a composite material with a concrete part inside the steel part, so it is excellent in strength and can be manufactured at low cost. It is possible to provide a well drilling jig capable of performing stable drilling.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of use showing a first embodiment of the present invention.

FIG. 2 is a sectional view of a blade body showing the first embodiment of the present invention.

FIG. 3 is a plan view of the blade body showing the first embodiment of the present invention.

FIG. 4 is an explanatory view showing a state in which a cylindrical drilling jig according to the first embodiment of the present invention is developed.

FIG. 5 is a sectional view of a base end of the ring body showing the first embodiment of the present invention.

FIG. 6 is a partially cutaway perspective view of a segment and a drilling jig showing the first embodiment of the present invention.

FIG. 7 is a longitudinal sectional view of a segment showing the first embodiment of the present invention.

FIG. 8 is a sectional view of a blade body showing a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drilling jig 2 Ring body 3 Blade body 11 Ring part 12 Inside inclined part 28 Concrete 43 Tube body (Izutsu)

Claims (2)

[Claims] 1. A jig for excavating a well tube, comprising: a ring body covering a tip side of a well tube buried underground; and a cutting blade body provided at a tip of the ring body, wherein the excavating blade is made of metal. A jig for excavating a well, characterized by being made of a well. 2. The excavating blade body includes a steel ring portion connected to the ring body and a steel inner inclined portion, and concrete is filled between the ring portion and the inner inclined portion. Features a well for excavating well cylinders.