JPH025848B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention is used in the field of civil engineering and construction for the construction of cast-in-place reinforced concrete columns and cast-in-place reinforced concrete continuous underground walls, etc., which are mainly used for earth retaining, etc. The present invention relates to equipment for removing precipitates such as excavation debris and slime that are generated during ground removal. [Conventional technology] Cast-in-place reinforced concrete shafts, cast-in-place reinforced concrete continuous underground walls, etc. are constructed by excavating the ground, then
It is constructed by removing sediments such as excavation debris and slime by dredging the bottom and constructing a reinforced concrete structure in the excavated area. Here, a conventional technique for removing the sediment by bottom dredging will be described with reference to the drawings. FIG. 4 shows a conventional bottom dredging bucket used for constructing cast-in-place reinforced concrete shafts. The bucket bag 7' is formed into a cylindrical shape with an open top and a bottom, and a convex portion 9 and an opening 10 are provided at the bottom portion 8. 11 is a wire for hanging the bucket 7'. The bottom dredging process using this bucket 7' will be explained. First, the bucket 7' is suspended in an excavation hole by a wire 11 and inserted to near the bottom of the excavation hole. Then, by twisting the wire 11, the bucket 7'
When the bucket 7' is rotated, the bottom of the excavation hole is dredged by the protrusion 9 formed on the bottom 8 of the bucket 7'. The dredged sediment flows into the bucket 7' through the opening 10 and is accumulated in the bottom 8. However, bottom dredging using the bucket 7' having such a configuration cannot remove the sediment efficiently and sufficiently. The load-bearing capacity of columns, walls, etc. constructed without removing the deposits becomes unreliable. Therefore, it becomes necessary to perform the sediment removal step in addition to the bottom dredging step. The conventional technology for these two processes is "Masa Miyazawa and Kimio Yamamoto co-authored,
"Earth Drill Construction Method" First Edition (May 16, 1980) Science and Engineering Book P. 47-51" (hereinafter referred to as Document 1), "Japan Foundation Construction Association, "Design and Construction of Cast-in-place Concrete Piles" (June 1, 1982) ) P.131-134” (hereinafter referred to as Document 2). The air lift construction method described in Document 1 or Document 2 is shown in FIG. As shown in Figure a, a discharge hose 12 and an air pipe 13 inserted into the discharge hose 12 are inserted into the excavation hole, and the bottom of the discharge hose 12 is left with a slight clearance from the bottom of the excavation hole. There is. Further, a stabilizing liquid 14 is injected into the excavated hole. When air is introduced into the discharge hose 12 from the air pipe 13, the stabilizing liquid 14 in the discharge hose 12 is discharged out of the excavation hole as shown in FIG. In this regard, the stable liquid containing the in-hole sediment flows into the discharge hose 12 from the bottom of the discharge hose 12, and is similarly discharged out of the borehole. Stabilizer 14
When the amount of stabilizer 14 decreases, the stabilizing liquid 14 is supplied through the pipe 18, as shown in FIG. In addition, the jet construction method described in Document 2 was
As shown in the figure. After completing the excavation shown in Figure a, reinforcing bars 19 are inserted into the excavated hole as shown in Figure b, and then
A tremie tube 15 having a jet injection device at its tip is inserted as shown in FIG. Immediately before concrete pouring, as shown in Figure d, fresh water as a stabilizing liquid 14 is jet-injected at high pressure from the tremie pipe 15, and the precipitates accumulated at the bottom of the excavation hole are suspended in the stabilizing liquid 14, and the injection is continued. Concrete 7 at the same time as stopping
The concrete is placed in close contact with the bottom of the borehole. The stabilizer 14 containing the precipitate floats to the top and is removed as the concrete 7 is poured, as shown in Figures e and f. In addition, in FIGS. d to d, the reinforcing bars 19 are omitted for the sake of explanation. Further, FIG. 7 shows the fresh water replacement method (suction method) also described in Document 2. In a construction method that uses a casing 16 throughout the entire area of the borehole, a lift pipe 17 is inserted into the borehole, and fresh water as the stabilizing liquid 14 is sent from the borehole, and the precipitate is removed from the lift pipe 17 together with the stabilizing liquid. It is something that excretes things. [Problems to be Solved by the Invention] However, in the explanatory diagram shown in FIG. If you do not manage the liquid etc. properly, it will not work properly. Furthermore, if the depth of the excavation hole is shallow, the effect will not be high, and if the depth of the excavation hole is deep, it will take a considerable amount of time to drain the deposits, which is a disadvantage. In addition, in the explanatory diagram shown in FIG. 6, there is a high risk of damaging the inner surface of the excavation hole due to jet injection, and there is also a possibility that suspended sediments will be caught in the uncured concrete. The disadvantage is that it is virtually difficult to control or manage these phenomena. Furthermore, the explanatory diagram shown in FIG. 7 has the disadvantage that it cannot be applied to a construction method that does not use the casing 16 throughout the excavation hole. As described above, in the conventional technology, each method for removing the precipitate has its own drawbacks. SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to provide a bucket for removing deposits that can easily and reliably remove the deposits. [Means for Solving the Problems] In order to solve the above-mentioned objects, the present invention provides: (1) a bucket bag having an outer cylindrical portion provided with a means for inserting into an excavated hole; a tapered cylindrical portion having an outer diameter that fits in the excavation hole, and a tapered cylindrical portion that is provided continuously from the edge of the opening provided on the bottom surface of the outer cylindrical portion and extends in a tapered shape inside the outer cylindrical portion; This is a bucket for removing sediment. (2) A bucket bag having an outer part provided with a means for inserting into a rectangular excavated groove, the outer part having a size to fit into the excavated groove, and having a width extending along the entire inner length of the rectangular bottom surface of the outer part. A bucket for sediment removal, characterized in that it comprises a tapered part that is provided continuously from the edge of a rectangular opening and extends so that the length of the short side of the opening becomes continuously narrower. That is. [Function] When the bucket of the present invention is inserted into an excavation hole or an excavation trench using a wire or the like up to the vicinity of the bottom of the excavation, and the bucket is pulled upwards using a wire or the like, a negative pressure is created below the bucket and the excavation wall and the bucket are pulled up. Stabilizing liquid shallower than the bucket flows in through the gap, and the water flow stirs the precipitates accumulated on the bottom of the excavation, so that the precipitates are suspended in the stabilizing liquid. Next, when the bucket is dropped into the excavation part by its own weight, the area below the bucket is pressurized, so the stabilizing liquid containing the precipitate passes through the tapered part of the bucket and squirts upward. By repeating this operation several times, the precipitate can be easily and reliably accommodated in the bucket. Another advantage is that it can be applied regardless of the presence or absence of a casing in the excavated portion and regardless of the depth of the excavated portion. Hereinafter, it will be explained in detail using the drawings. [Example] Fig. 1 shows an example of the bucket for removing sediment of the present invention used for constructing cast-in-place reinforced concrete shafts, and Fig. 1b shows an overall perspective view;
a is a longitudinal cross-sectional view. As shown in FIG. 1, the bucket 1 of this embodiment
The cylindrical portion 2 is formed to have a diameter slightly smaller than the diameter of the excavation hole. The tapered cylindrical part 3 is the cylindrical part 2
is connected from the side of the lower opening 2a, and
The tapered cylindrical portion 3 extends inside the cylindrical portion 2 in a tapered shape. Further, a valve member 4 is attached to the opening 3a on the tapered side of the tapered cylinder portion 3. Also,
A frame 5 is installed between the outer surface 3b of the tapered cylindrical portion 3 near the opening 3a and the inner surface 2b of the cylindrical portion 2, and a wire 6 for suspending the bucket 1 is attached to the frame 5. has been done. Next, the operation of this embodiment will be explained using FIG. 2. The deposits can be easily removed by inserting the bucket 1 into an excavation hole using a wire 6 to near the bottom of the excavation hole and reciprocating it in the vertical direction. That is, when the bucket 1 is pulled upward by the wire 6, the pressure deeper than the bucket 1 becomes negative, and the stable liquid shallower than the bucket 1 flows through the gap between the borehole wall and the bucket 1, and the water flow reaches the bottom of the borehole. The accumulated precipitate is stirred and suspended in the stabilizing liquid. Next, when the bucket 1 is dropped into the excavation hole by its own weight, the depth below the bucket 1 is pressurized, so the stabilizing liquid containing the precipitate flows into the tapered cylindrical part 3 through the opening 2a at the bottom of the bucket 1. It flows in, passes through the tapered cylindrical portion 3, pushes up the valve member 4, is ejected upward, and flows into the upper part of the bucket 1 . The tapered cylinder portion 3 extends in a tapered manner as described above.
has the effect of accelerating the water flow rising from below with less resistance. By repeating this operation several times, the sediment accumulated at the bottom of the excavation hole will float above the bucket 1 . After reciprocating in the vertical direction, the bucket 1 is stopped at the bottom of the excavation hole,
Wait for the floating precipitate to settle. The settled sediment is accommodated in the interior 1b of the bucket 1 (the space formed by the inner surface 2b of the cylindrical portion 2 and the outer surface 3b of the tapered cylindrical portion 3). Finally, the bucket 1 is recovered outside the excavation hole using the wire 6. These operations allow the precipitate to be removed easily and reliably. In this embodiment, an example of application to cast-in-place reinforced concrete piles has been shown, but as another embodiment of the present invention, an example of application to construction of a cast-in-place reinforced concrete continuous underground wall will be described using FIG. As shown in Fig. 3, the bucket 1' of this embodiment has a rectangular cross section consisting of three chambers 1'a, 1'b, and 1'c, and its width is slightly smaller than the excavation groove. It is formed so that. The tapered portion 3' is continuous from the side of the opening 2'a below the outer portion 2', and the tapered portion 3' extends inside the outer portion 2' in a tapered shape. Further, a valve member 4' is attached to the opening 3'a on the tapered side of the tapered portion 3'. Moreover, the opening 3'a of the tapered part 3'
Nearby outer surface 3'b and inner surface 2'b of outer part 2'
A frame 5' is installed between them, and a wire 6' for suspending the bucket 1 ' is attached to the frame 5'. In this embodiment, a stabilizing liquid 14 containing the precipitate deposited on the bottom of an excavation trench is collected in a tapered chamber 1'c by the same operation as in the embodiment shown in FIG.
It is accommodated in the chambers 1'a and 1'b and removed through the chambers 1'a and 1'b, and a detailed explanation will be omitted. In addition, although these embodiments have described embodiments including the valve members 4, 4', it goes without saying that embodiments without the valve members 4, 4' are also possible. [Effects of the Invention] As explained above, the present invention is capable of removing the precipitates accumulated at the bottom of the borehole simply by reciprocating the bucket up and down, so that the precipitates can be easily and reliably removed. effective. Another advantage is that it can be applied regardless of the presence or absence of a casing in the borehole and regardless of the depth of the borehole.

[Brief explanation of drawings]

Fig. 1a is a longitudinal sectional view of an embodiment of the present invention, Fig. 1b is a perspective view of the whole, Fig. 2 is an explanatory diagram showing the operation of the embodiment of the invention, and Fig. 3 is another embodiment of the invention. FIGS. 4 to 7 are perspective views and explanatory views showing conventional techniques. 1 , 1 ', 7': Bucket, 1b: Inside, 2: Cylindrical part, 2': Outside part, 2b, 2'b: Inside surface, 3:
Tapered cylinder part, 3': Tapered part, 3b, 3'b: Outer surface, 4, 4': Valve member, 5, 5': Frame part, 6, 6',
11: wire, 7: concrete, 8: bottom,
9: Convex portion, 2a, 3a, 2'a, 3'a, 10: Opening, 12: Discharge hose, 13: Air pipe, 1
4: Stabilizing liquid, 15: Tremy pipe, 16: Casing, 17: Lifting pipe, 18: Pipe, 19: Rebar.

Claims (1)

[Scope of Claims] 1. A bucket bag having an outer cylindrical part provided with means for inserting into an excavation hole, the outer cylindrical part having an outer diameter that fits into the excavation hole, and a bottom surface of the outer cylindrical part. 1. A bucket for removing sediment, comprising: a tapered cylindrical portion that is provided continuously from the edge of the provided opening and extends in a tapered shape inside the outer cylindrical portion. 2. A bucket bag having an outer part provided with a means for inserting into a rectangular excavated groove, the outer part having a size to fit into the excavated groove, and extending over the entire inner length of the rectangular bottom surface of the outer part. A bucket for removing sediment, comprising a tapered part that is continuously provided from the edge of a rectangular opening and extends so that the length of the short side of the opening becomes continuously narrower.