JP2017166160A - Connection structure between bucket and connection casing, and excavated hole backfill method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connection structure between a bucket and a connection casing, along with an excavated hole backfill method, the bucket being capable of removing residual soil from the excavated hole.SOLUTION: A connection structure comprises a first connection structural body 21 fixed on a bucket 1 and a second connection structural body 31 fixed on a connection casing 10. The bucket includes a peripheral surface part 2 and a bottom surface part 3 provided on an edge side in an axial direction of the peripheral surface part and having an intake port for taking in sediment. The first connection structural body 21 is fixed on the other edge side in the axial direction of the peripheral surface part 2, while the second connection structural body 31 is fixed on an edge side in an axial direction of the connection casing 10. Either the first connection structural body 21 or the second connection structural body 31 is fitted inside the other. On an outer peripheral surface of the either the first or the second connection structural body fitted inside has a protrusion 32 protruding outward fixed at a plurality of locations in a circumferential direction, while an insertion part 22 into which the protrusion 32 is inserted is formed at a location corresponding to the protrusion 32 on the other. A stopper 40 is inserted between the insertion part 22 and the protrusion 32.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a connection structure between a bucket and a connection casing and a drilling hole backfilling method, and more specifically, when the remaining pile remaining in the ground is pulled out, the adhered soil detached from the outer peripheral surface of the remaining pile is again The present invention relates to a connection structure between a bucket and a connection casing used for digging out soil that has fallen into a digging hole from the digging hole, and a digging hole backfilling method.

  Conventionally, work to reclaim land where the building existed has been performed by pulling out the remaining piles in the ground after dismantling the building and backfilling it. When performing such work, after pulling out the pile, a backfilling agent suitable for the land quality is prepared, and the excavation hole formed by pulling out the pile is filled with the backfilling agent.

  In the method of pulling out the remaining pile from the ground, first, on the ground, the periphery of the remaining pile is excavated by using a casing for excavation, and an excavation hole is formed around the remaining pile. Next, the excavating casing is once pulled up. Next, a wire is hung on the excavation casing, the excavation casing is again inserted into the ground, and the wire is hung from the excavation casing on the remaining pile in the ground. And the residual pile is pulled out from the ground by pulling up the wire. Until now, various methods have been proposed for such methods.

  For example, the construction method proposed in Patent Document 1 includes a means for holding the wire rope ring at the lower end of the casing screw and releasing the holding, and the casing screw is lowered so as to fit the casing screw into the underground pile. This is a residual pile drawing method in which the holding of the ring portion is released by the releasing means, the casing screw is removed leaving the ring portion, and the wire rope is pulled to pull out the pile.

JP 2010-255300 A

  When a wire is hung on the remaining pile and the wire is pulled up as in the construction method proposed by Patent Document 1, a large amount of soil adheres to the peripheral surface of the pulled-up remaining pile. In the field of civil engineering and construction, soil adhering to the surface of piles and sheet piles pulled out from the ground is called “earth clay”, but in this specification, it will be described as “attached soil”.

  When the remaining pile is pulled out from the ground and the pile is lifted by a crane device or the like, the adhered soil attached to the peripheral surface of the residual pile may be detached from the peripheral surface of the residual pile. Therefore, the remaining soil is pulled up from the ground and the remaining pile is removed from the ground surface so that the soil that has left the peripheral surface does not fall to the worker who is working near the remaining pile. In the stage before it is lifted high from the ground, the work of artificially removing the adhered soil from the peripheral surface of the remaining pile is performed.

  However, some of the soil that has been artificially removed from the peripheral surface of the remaining pile will fall again into the excavation hole instead of the ground. The adhering soil that has fallen again into the excavation hole becomes an obstacle to improving the ground to a desired quality when the backfilling agent is supplied to the excavation hole to improve the ground.

  The present invention has been made in order to solve the above-described problems. The purpose of the present invention is to remove residual soil remaining in a drilling hole even when the adhered soil removed from the peripheral surface of the remaining pile falls again into the drilling hole. It is an object to provide a connection structure between a bucket and a connection casing that can be removed from a drill and a drilling hole backfilling method.

  (1) The connection structure between the bucket and the connection casing according to the present invention for solving the above problems is connected to the bucket used when removing the residual soil from the hole from which the remaining pile remaining in the ground is pulled out. A connection structure with a casing for use, comprising: a first connection structure fixed to the bucket; and a second connection structure fixed to the connection casing and connected to the first connection structure The bucket is formed of an annular peripheral surface portion and an inclined surface provided on one end side in the axial direction of the peripheral surface portion, and is inclined from the peripheral edge toward the center. A bottom surface portion having an intake port for taking in earth and sand, the first connection structure is fixed to the other end side in the axial direction of the peripheral surface portion, and the second connection structure is the connection On one end of the casing for the axial direction The first connection structure and the second connection structure are configured such that one of them is fitted inside the other, and one outer periphery of the first connection structure and the second connection structure. Projections that protrude radially outward are fixed to a plurality of circumferential positions on the surface, and the other of the first connection structure and the second connection structure has a position corresponding to the projection. A stopper to be inserted between the inserted portion and the protrusion in the form in which the insertion portion for inserting the protrusion is formed, and the protrusion is inserted into the insertion portion. Is provided.

  According to this invention, the first connection structure is fixed to the other end side in the axial direction of the peripheral surface portion, and the second connection structure is fixed to one end side in the axial direction of the connection casing. Since the body and the second connection structure are configured such that one of them is fitted inside the other, the connection casing and the bucket can be easily connected. In particular, in the present invention, on one outer peripheral surface of the first connection structure and the second connection structure, protrusions protruding outward in the radial direction are fixed at a plurality of positions in the circumferential direction, An inserted portion for inserting the protrusion inside is formed at a position corresponding to the protrusion, and the protrusion is inserted between the inserted portion and the protrusion in the form of being inserted into the insertion portion. Since the stopper is provided, the stopper can hold both connection forms.

  The connection structure between the bucket and the connecting casing having such a configuration is to remove the residual soil remaining in the excavation hole from the excavation hole even when the adhered soil removed from the peripheral surface of the remaining pile falls again into the excavation hole. Therefore, when the backfilling agent is supplied to the excavation hole, the influence of the residual soil remaining in the excavation hole can be suppressed.

  In the connection structure between the bucket and the connection casing according to the present invention, the protrusion is composed of a longitudinal member extending in the axial direction and a circumferential member extending from the longitudinal member to one side in the circumferential direction, and the inserted object. An insertion passage for inserting the protrusion in the axial direction on the inner surface of the portion, and a circumferential passage in the back of the insertion passage that extends in the same direction as the circumferential member extends and into which the circumferential member is inserted And are formed.

  According to this invention, the protrusion is configured by the vertical member and the circumferential member, and is formed on the inner surface of the insertion portion by the insertion passage and the circumferential passage. Therefore, the protrusion is inserted into the insertion portion. Sometimes, the longitudinal member and the insertion passage prevent the connecting casing from rotating relative to the bucket, and the circumferential member and the circumferential groove prevent the bucket and the connecting casing from separating.

  In the connection structure between the bucket and the connection casing according to the present invention, the circumferential member has a circumferential direction with a certain gap between the upper end of the first connection structure or the lower end of the second connection structure. The insertion passage is formed in a form in which the protrusion is caused to protrude from either the upper end of the first connection structure or the lower end of the second connection structure.

  According to this invention, it can be set as the structure which makes the position of the circumferential member which comprises a projection body correspond to the position of the axial direction in which the circumferential groove | channel which comprises an insertion part is formed.

  In the connection structure between the bucket and the connection casing according to the present invention, an insertion portion is formed in the first connection structure, and the protrusion is fixed to the second connection structure.

  According to this invention, since the insertion portion is formed in the first connection structure and the protrusion is fixed to the second connection structure, the protrusion and the insertion portion are connected when connecting the two. Can be easily aligned, and both can be easily connected.

  (2) The excavation hole backfilling method according to the present invention for solving the above-mentioned problems uses a casing for excavation, and after excavating the outer peripheral surface of the remaining pile in the longitudinal direction of the remaining pile, a wire is hung on the remaining pile. The excavation hole backfilling method of pulling up the wire and pulling out the residual pile, and after filling up the residual soil present in the excavation hole after the residual pile is extracted, An attached soil removing process for removing the attached soil attached to the outer peripheral surface of the pulled-out residual pile; a bucket used for pumping up the residual soil remaining in the hole after the remaining pile is pulled out; and the bucket A connecting casing for connecting to the connecting casing, and in the connecting step, the annular peripheral surface portion is provided on one end side in the axial direction of the peripheral surface portion, and is inclined from the peripheral edge toward the center. The connecting casing fixed to the other end side in the axial direction of the peripheral surface portion, and a bottom surface portion having a tapered shape that is formed of an inclined surface and having a tapered shape. An annular first connection structure that is connected to one end side in the axial direction, and a second annular connection that is fixed to the one end side in the axial direction and connected to the first connection structure The connection casing having a structure is fixed to a plurality of circumferential positions on one outer peripheral surface of the first connection structure and the second connection structure, and protrudes outward in the radial direction. By inserting a protrusion into an insertion portion provided at a position corresponding to the protrusion on the other of the first connection structure and the second connection structure, the first connection structure and the first connection structure One side with 2 connection structure on the other Inset within said at protrusion is inserted into the interior of the inserted part form, the inserted stopper between the protrusions and the inserted part.

  According to this invention, on one outer peripheral surface of the first connection structure and the second connection structure, protrusions protruding outward in the radial direction are fixed at a plurality of positions in the circumferential direction, and on the other side, An inserted portion for inserting the protrusion inside is formed at a position corresponding to the protrusion, and the protrusion is inserted between the inserted portion and the protrusion in the form of being inserted into the insertion portion. Since the stopper is provided, the stopper can hold both connection forms.

  By implementing the excavation hole backfilling method using the connection structure between the bucket having such a structure and the connection casing, excavation is performed even when the soil removed from the peripheral surface of the remaining pile falls again into the excavation hole. Since the residual soil remaining in the hole can be removed from the excavation hole, the influence of the residual soil remaining in the excavation hole can be suppressed when the backfilling agent is supplied to the excavation hole.

  In the excavation hole backfilling method according to the present invention, the protrusion is composed of a longitudinal member extending in the axial direction and a circumferential member extending from the longitudinal member to one side in the circumferential direction. An insertion passage for inserting the protrusion in the axial direction, and a circumferential passage at the back of the insertion passage that extends in the same direction as the circumferential member extends, and into which the circumferential member is inserted, The connecting casing is brought close to the bucket, the protrusion is inserted into the insertion portion, and then the connection casing is rotated in a direction in which the circumferential member extends, and then the protrusion of the protrusion The stopper is inserted into a gap formed between the vertical member and the inserted portion.

  According to this invention, the bucket and the connecting casing can be easily and reliably connected.

  According to the connection structure between the bucket and the casing for connection according to the present invention and the excavation hole backfilling method, even when the adhered soil removed from the peripheral surface of the remaining pile falls again into the excavation hole, the residual soil remaining in the excavation hole is reduced. Since it can remove from a digging hole, when backfilling agent is supplied to a digging hole, the influence of the residual soil which remains in a digging hole can be controlled. Therefore, the ground after pulling out the residual pile can be improved to the originally planned quality ground.

It is a perspective view showing the outline of the connection structure of the bucket and connection casing of one embodiment concerning the present invention. It is explanatory drawing for demonstrating the detail of a connection structure, Comprising: It is a figure which shows the form before a bucket and the casing for connection are connected. It is explanatory drawing for demonstrating the detail of a connection structure, Comprising: It is a figure which shows the form after the bucket and the casing for connection are connected. It is sectional drawing of the ground which shows the progress in the middle of excavating the circumference | surroundings of a remaining pile using the casing for excavation. It is sectional drawing of the ground which shows the state which finished excavating the circumference | surroundings of the remaining pile using the casing for excavation. It is sectional drawing of the ground which shows the process of extracting the casing for excavation used for excavation. It is sectional drawing of the ground which shows the process of hanging a wire on a residual pile using the casing for excavation used for excavation. It is sectional drawing of the ground which shows the process of extracting a residue from the ground. It is explanatory drawing explaining the first process of the procedure connected with a bucket and the casing for connection. It is explanatory drawing explaining the 2nd process of the procedure connected with a bucket and the casing for connection. It is explanatory drawing explaining the 3rd process of the procedure connected with a bucket and the casing for connection. It is explanatory drawing explaining the last process of the procedure connected with a bucket and the casing for connection. It is sectional drawing of the ground for demonstrating the process of removing the residual soil remaining inside a digging hole using the bucket connected to the casing for connection. It is sectional drawing of the ground in the state where the backfilling was complete | finished.

[Connection structure between bucket and casing for connection]
<Basic structure>
The connection structure 20 between the bucket 1 and the connection casing 10 according to the present invention includes the bucket 1 and the connection casing 10 used when removing the residual soil from the excavation hole 100 from which the remaining pile 80 remaining in the ground has been pulled out. It is the connection structure 20 with. As shown in FIG. 1 and FIG. 2, the connection structure 20 between the bucket 1 and the connection casing 10 is fixed to the first connection structure 21 fixed to the bucket 1 and the connection casing 10, and the first connection It is comprised by the 2nd connection structure 31 for making it connect with the structure 21. FIG.

  The bucket 1 is formed of an annular peripheral surface portion 2 and an inclined surface 3a which is provided on one end side in the axial direction of the peripheral surface portion 2 and is inclined from the peripheral edge toward the center. And a bottom surface portion 3 having an intake port 5 for taking in the earth and sand. The first connection structure 21 is fixed to the other end side of the peripheral surface portion 2 in the axial direction. On the other hand, the connection casing 10 has substantially the same structure as a generally used excavation casing. The second connection structure 31 is fixed to one end of the connection casing 10 in the axial direction.

  The first connection structure 21 and the second connection structure 31 are configured such that one of them is fitted inside the other, and one outer periphery of the first connection structure 21 and the second connection structure 31. Projections 32 protruding outward in the radial direction are fixed to a plurality of positions in the circumferential direction on the surface, and the other of the first connection structure 21 and the second connection structure 31 corresponds to the protrusion 32. The insertion portion 22 for inserting the protrusion 32 inside is formed at the position. Furthermore, the connection structure 20 between the bucket 1 and the connection casing 10 is a stopper inserted between the inserted portion 22 and the protrusion 32 in a form in which the protrusion 32 is inserted into the inserted portion 22. 40.

  According to the connection structure 20 between the bucket 1 and the connection casing 10 according to the present invention, even when the adhered soil removed from the peripheral surface of the remaining pile 80 falls into the excavation hole 100 again, the residual soil remaining in the excavation hole 100. Therefore, when the backfilling agent is supplied to the excavation hole 100, the adverse effect of the residual soil remaining in the excavation hole 100 can be suppressed. Therefore, the ground after pulling out the residual pile can be improved to the originally planned quality ground.

  Hereinafter, details of the connection structure 20 between the bucket 1 and the connection casing 10 according to the present invention will be described with reference to the drawings as appropriate.

(Connection casing)
First, the connection casing 10 will be described. The connection casing 10 is obtained by improving a casing generally used for the excavation casing 70. Specifically, the connecting casing 10 is obtained by processing one end of the excavating casing 70 in the axial direction to be flat.

(bucket)
In general, there are buckets called a rough bucket and a bucket called a drilling bucket. As shown in FIGS. 1 and 2, the bucket 1 used in the present invention is a rough bottom bucket. However, the connection structure of the present invention can be applied to a drilling bucket as necessary. The bottom-roughened bucket is mainly when the soil remaining at the bottom of the excavation hole 100 or the adhered soil adhering to the peripheral surface of the remaining pile 80 is removed after the remaining pile 80 embedded in the ground is pulled out. The soil or the like that has fallen again into the excavation hole 100 is used for picking up from the bottom of the excavation hole 100.

  The bucket 1 is made of a high-strength material such as a steel material, and is made up of an annular peripheral surface portion 2 and a bottom surface portion 3 provided on one end side in the axial direction of the peripheral surface portion 2. The diameter of the peripheral surface portion 2 is slightly larger than the diameter of the connecting casing 10. The bottom surface portion 3 is composed of an inclined surface 3a from the peripheral edge to the center, has a tapered shape as it goes from the peripheral edge to the center, and has a shape in which the cone is reversed. The inclined surface 3 a of the bottom surface portion 3 is provided with at least one intake port 4 and a segment 5 in the circumferential direction for taking in the soil remaining at the bottom of the excavation hole 100 into the bucket 1. The bucket 1 is configured such that the segment 5 collects the residual soil and rotates the residual soil into the bucket 1 through the intake port 4 by rotating around the central portion inside the excavation hole 100.

(First connection structure)
The first connection structure 21 is for connection to one end side in the axial direction of the connection casing 10, and is fixed to the other end side in the axial direction of the peripheral surface portion 2 constituting the bucket 1. The first connection structure 21 has an annular shape, and the diameter thereof is the same as or substantially the same as the diameter of the peripheral surface portion 2 of the bucket 1. One end of the first connection structure 21 in the axial direction is fixed to the other end of the peripheral surface portion 2 of the bucket 1. In the example shown in FIGS. 1 to 3, one end of the first connection structure 21 in the axial direction and the other end of the peripheral surface portion 2 are fixed by welding. However, the fixing method is not limited to welding. For example, an annular member is provided on the outer peripheral portion of both members, and one end side in the height direction of the annular member is fixed to the peripheral surface portion 2 with a bolt. In addition, the other end may be fixed to the first connection structure 21 with a bolt.

  In the first connection structure 21, inserted portions 22 into which protrusions 32 to be described later are inserted are formed at a plurality of positions in the circumferential direction. In the example shown in FIGS. 1 to 3, the inserted portions 22 are provided at four locations in the circumferential direction. The inserted portion 22 includes a groove portion 23 in which the peripheral surface portion 2 is cut out, and a closing member 26 for closing the groove portion 23 from the outside in the radial direction.

  The groove portion 23 includes an insertion passage that extends in the axial direction of the first connection structure 21 and allows the protrusion 22 to be inserted in the axial direction, and a circumferential passage 25 that extends in the circumferential direction at the back of the insertion passage 24. Yes. Specifically, in the groove portion 23, as shown in FIGS. 1 to 3, the insertion passage 24 extends from the upper end of the first connection structure 21 toward the lower side of the first connection structure 21. The width of the insertion passage 24 is formed to be slightly larger than the circumferential length of the circumferential member 34 that constitutes the protrusion 32 described later. The circumferential passage 25 extends in the circumferential direction from a position behind the insertion passage 24, specifically, from a lower end portion of the insertion passage 24. All the circumferential passages 25 of each inserted portion 22 extend in the same direction.

  The closing member 26 is made of a rectangular plate material. The closing member 26 is fixed to the peripheral surface portion 2 from the outside of the peripheral surface portion 2 at the position of the groove portion 23, and a pocket is formed by the groove portion 23 and the closing member 26. Although the fixing method is not particularly limited, the closing member 26 may be fixed by welding to the outer peripheral surface of the peripheral surface portion 2.

(Connection casing)
As the connection casing 10, a general excavation casing 70 is used. However, the connecting casing 10 has one end in the axial direction processed to be flat in order to fix a second connecting structure 31 described later. The diameter of the connecting casing 10 is slightly smaller than the diameter of the peripheral surface portion 2 constituting the bucket 1. Therefore, the connection casing 10 has a structure that can be fitted inside the peripheral surface portion 2 of the bucket 1. The second connection structure 31 is fixed to one end of the connection casing 10 in the axial direction.

(Second connection structure)
The 2nd connection structure 31 is for connecting with the 1st connection structure 21 fixed to the bucket 1, and is being fixed to the end of an axial direction. The second connection structure 31 has an annular shape, and the diameter thereof is the same as or substantially the same as the diameter of the connection casing 10. In the example shown in FIGS. 1 to 3, one end in the axial direction of the second connection structure 31 is fixed by welding to one end of the connection casing 10. However, the fixing method is not limited to welding as in the case of the first connection structure 21. For example, an annular member is provided on the outer peripheral portion of both, and the height of the annular member is set. One end side in the direction may be fixed to the connection casing 10 with a bolt and the other end side may be fixed to the second connection structure 31 with a bolt.

  On the outer peripheral surface of the second connection structure 31, protrusions 32 protruding outward in the radial direction are fixed at a plurality of positions in the circumferential direction. In the example shown in FIGS. 1 to 3, the protrusions 32 are provided at four locations in the circumferential direction. For example, the protrusion 32 is fixed to the outer peripheral surface of the second connection structure 31 by welding.

  The protrusion 32 includes a longitudinal member 33 extending in the axial direction of the second connection structure 31 and a circumferential member 34 extending from the longitudinal member 33 to one side in the circumferential direction. Specifically, in the example illustrated in FIGS. 1 to 3, the protrusion 32 has an alphabetic “L” shape. The vertical member 33 extends from the lower end of the second connection structure 31 toward the upper side of the second connection structure 31 from a position where a certain gap is left. On the other hand, the circumferential member 34 has a form extending in the circumferential direction with a certain gap between the lower end of the second connection structure 31.

  The longitudinal member 33 has a function of preventing the bucket 1 from rotating in the circumferential direction with respect to the connection casing 10 in cooperation with the insertion passage 24 and the stopper 40 described later. On the other hand, the circumferential member 34 has a function of preventing the bucket 1 and the connecting casing 10 from being separated in the axial direction of both.

  In the connection structure 20 of the bucket 1 and the connection casing 10 having the above-described configuration, as shown in FIG. 3, the circumferential member 34 constituting the protrusion 32 fixed to the second connection structure 31 is the first. It is inserted into the circumferential passage 25 formed in the inserted portion 22 of the connection structure 21. In this state, a gap is formed between the vertical member 33 constituting the protrusion 32 and the insertion passage 24 of the groove 23. A stopper 40 is inserted into this gap.

  The method of connecting the first connection structure 21 fixed to the bucket 1 and the second connection structure 31 fixed to the connection casing 10 will be described in detail later.

  As described above, the diameter of the connection casing 10 is formed smaller than the diameter of the peripheral surface portion 2 of the bucket 1, the inserted portion 22 is formed in the first connection structure 21, and the protrusion 32 is formed on the second connection structure 31. As an example, the configuration in which the connection structure 20 is configured by fixing the connection has been described. However, contrary to the embodiment described above, the diameter of the connecting casing 10 is formed larger than the diameter of the peripheral surface portion 2 of the bucket 1, and the protrusion 32 is fixed to the first connecting structure 21, and the first The connection structure 20 can also be configured by forming the inserted portion 22 in the two-connection structure 31.

[Drilling hole backfilling method]
Next, each step of the excavation hole backfilling method of the present invention will be described with reference to FIGS.

<Basic process of drilling hole backfilling method>
In the excavation hole backfilling method of the present invention, the excavating casing 70 is used to excavate the outer peripheral surface of the remaining pile 80 in the longitudinal direction of the remaining pile 80, and then the wire 55 is hung on the remaining pile 80 and the wire 55 is pulled up to remain. This is a construction method in which the pile 80 is pulled out, the residual soil present in the excavation hole 100 after the remaining pile 80 is pulled out, and then the excavation hole 100 is backfilled.

  In this excavation hole backfilling method, the adhering soil removal step of removing the adhering soil adhering to the outer peripheral surface of the pulled-out residual pile 80 during the execution of these steps, and the inside of the excavation hole after the residual pile 80 is extracted A connecting step of connecting the bucket 1 used for pumping up the residual soil remaining in the container and a connecting casing 10 connected to the bucket 1.

  In the connection process, the bucket 1 and the connection casing 10 are connected as follows. Since the structure of the bucket 1 and the structure of the connecting casing 10 have already been described, description of these structures is omitted here.

  The protrusions 32 fixed at a plurality of positions in the circumferential direction of one outer peripheral surface of the first connection structure 21 and the second connection structure 31 are connected to the other of the first connection structure 21 and the second connection structure 31. By inserting the inserted portion 22 into a position corresponding to the protrusion 32, one of the first connection structure 21 and the second connection structure 31 is fitted inside the other. Thereafter, the stopper 40 is inserted between the inserted portion 22 and the protrusion 32 in a form in which the protrusion 32 is inserted into the inserted portion 22.

  As described above, the protrusion 32 includes the vertical member 33 extending in the axial direction and the circumferential member 34 extending from the vertical member 33 to one side in the circumferential direction. An insertion passage 24 that inserts the shaft 32 in the axial direction, and a circumferential passage 25 that extends in the same direction as the direction in which the circumferential member 34 extends at the back of the insertion passage 24 and into which the circumferential member 34 is inserted are formed. .

  Connected to the bucket 1 having the first connection structure 21 having one of the protrusion 32 and the inserted portion 22 having such a structure and the second connection structure 31 having the other of the protrusion 32 and the insertion portion 22. When connecting the casing 10 for connection, the casing 10 for connection is brought close to the bucket 1, the protrusion 32 is inserted into the inserted portion 22, and then the casing 10 for connection is rotated in the direction in which the circumferential member 34 extends. Thereafter, the stopper 40 is inserted into a gap formed between the vertical member 33 of the protrusion 32 and the inserted portion 22.

  Each work process of the excavation hole backfilling method will be specifically described with reference to FIGS. 4 to 14 as appropriate.

  Although not specifically shown in the drawing, first, in a process called “pile head excavation”, the position where the remaining pile 80 is buried is investigated, and the remaining pile 80 is used using an excavator such as a hydraulic excavator 95. Cue. Further, in a process called “stand pipe set”, a stand pipe is embedded around the head of the remaining pile 80 so that the peripheral wall of the mouth does not collapse during the pile removing operation. Then, in a process called “stand pipe peripheral backfilling”, the outer periphery of the standpipe is backfilled using a hydraulic excavator 95 to prepare a ground for performing the pile unloading work. Then, in a process called “machine set at the removed pile position”, a pile remover 50 or the like used when the remaining pile 80 is pulled out is disposed on the ground near the remaining pile 80. The pile cutter 50 shown in FIGS. 4 to 13 is a crawler type heavy machine equipped with an extendable boom.

  The pile remover 50 extends a boom and is attached with a leader 60 that extends perpendicularly to the tip of the boom. An auger 65 that moves up and down along the leader 60 is attached to the leader 60. The auger 65 is operated when the excavating casing 70 is rotated to perform excavation. The auger 65 is suspended by the main hook 51 with a slinging wire rope.

  Next, as shown in FIG. 4, excavation is performed along the outer periphery of the remaining pile 80 using the excavation casing 70 in the outer periphery excavation process. In the outer periphery excavation process, as shown in FIG. 4, a cylindrical excavation casing 70 with an excavation bit attached to the tip is suspended by a pile remover 50 so that the remaining pile 80 enters the excavation casing 70. Then, the excavating casing 70 is lowered while rotating. Thereby, it can dig along the outer peripheral part of the residual pile 80.

  In this outer periphery excavation process, excavation is performed by connecting the excavation casing 70 in the axial direction until the lower end of the excavation casing 70 reaches the lower end of the remaining pile 80 as shown in FIG. Then, when the lower end of the excavation casing 70 reaches the lower end of the remaining pile 80 as shown in FIG. 5, the excavation work is stopped.

  Next, in the excavation casing 70 extraction step, the excavation casing 70 used for excavation is extracted from the ground using a pile remover 50 as shown in FIG. At that time, separation of the excavation casing 70 connected using the aerial work vehicle 90 or the like is efficiently performed.

  Next, as shown in FIG. 7, a ring of the wire 55 for pile removal is wound around the tip end of the pulled excavating casing 70. The other end of the wire 55 is hooked on the auxiliary hook 52 of the pile remover 50. Then, the excavating casing 70 is returned to the ground again, and the ring of the wire 55 is hung on the upper portion of the remaining pile 80. When the ring of the wire 55 is applied to the remaining pile 80, the excavating casing 70 from which the wire 55 has been detached is pulled up by the pile removing machine 50, and the excavating casing 70 is pulled out again.

  Next, the excavation casing 70 is removed, and as shown in FIG. 8, the upper end of the wire 55 is replaced with the main hook 51 of the pile remover 50, and the remaining pile 80 is pulled out from the excavation hole 100.

  A lot of soil adheres to the peripheral surface of the remaining pile 80 pulled out. The adhered soil adhering to the peripheral surface of the remaining pile 80 may fall when the remaining pile 80 is lifted by the pile removing machine 50. Therefore, the adhered soil falls to the worker who is working near the remaining pile 80 by removing the remaining pile 80 from the peripheral surface of the remaining pile 80 before it is lifted from the ground by the pile remover. To prevent it.

  When removing the adhered soil adhering to the peripheral surface of the remaining pile 80, the removed adhered soil may fall into the excavation hole 100 again. If the backfilling agent is supplied to the excavation hole 100 and the ground is improved with the attached soil remaining in the excavation hole 100, there is a risk that the ground will be deteriorated to a quality lower than the originally planned quality. Therefore, it is necessary to remove the adhered soil that has fallen into the excavation hole 100 from the excavation hole 100. The bucket 1 and the connection casing 10 using the connection structure 20 between the bucket 1 and the connection casing 10 according to the present invention are used for removing the soil that has fallen into the excavation hole 100 from the excavation hole 100.

  The process of connecting the bucket 1 and the connecting casing 10 will be described with reference to FIGS.

  First, as shown in FIG. 9, the positions of the inserted portions 22 formed in the first connection structure 21 and the protrusions 32 fixed to the second connection structure 31 are made to correspond to each other in the circumferential direction. The connection casing 10 to which the second connection structure 31 is fixed is brought closer to the bucket 1 to which the structure 21 is fixed.

  Next, as shown in FIG. 10, the protrusion 32 fixed to the second connection structure 31 is inserted into the inserted portion 22 formed in the first connection structure 21. Specifically, the protrusions 32 fixed to the second connection structure 31 are inserted along the insertion passages 24 of the grooves 23 constituting the first connection structure 21. As described above, the width of the insertion passage 24 constituting the inserted portion 22 is formed to be larger than the circumferential length of the circumferential member 34 constituting the protrusion 32, and thus the protrusion 32. Can be inserted into the insertion portion 22. Moreover, since the diameter of the 1st connection structure 21 is formed larger than the diameter of the 2nd connection structure 31, it becomes a structure where the 1st connection structure 21 is engage | inserted inside the 2nd connection structure 31. FIG. ing.

  Next, as shown in FIG. 11, the connecting casing 10 is rotated in the direction in which the circumferential member 34 extends, and the circumferential member 34 is inserted into the circumferential passage 25 of the inserted portion 22. In the form in which the circumferential member 34 is inserted into the circumferential passage 25, a gap is formed between the insertion passage 24 and the vertical member 33.

  Thereafter, as shown in FIG. 12, the stopper 40 is inserted into the gap formed between the insertion passage 24 and the vertical member 33. By inserting the stopper 40 into the gap formed between the insertion passage 24 and the vertical member 33, the first connection structure 21 is fixed to the connection casing 10 to which the second connection structure 31 is fixed. Rotation with respect to the bucket 1 is prevented, and the connection casing 10 is fixed to the bucket 1.

  After the bucket 1 and the connection casing 10 are thus connected, the bucket 1 and the connection casing 10 are inserted into the excavation hole 100 as shown in FIG. In this case, the excavation casing 70 is sequentially connected to the connection casing 10 so that the bucket 1 reaches the bottom of the excavation hole 100.

  After the bucket 1 reaches the bottom of the excavation hole 100, the excavation casing 70 is rotated. As the excavating casing 70 is rotated, both the connecting casing 10 and the bucket 1 are rotated. The bottom surface portion 3 of the bucket 1 is provided with an intake port 5 for taking in the soil into the bucket 1, so that the attached soil that has fallen into the excavation hole 100 with the rotation of the bucket 1 Captured inside.

  When the inside of the bucket 1 is filled with the attached soil, the excavating casing 70 is sequentially pulled out from the excavating hole 100, and the connecting casing 10 and the bucket 1 are lifted to the ground. Then, the attached soil taken into the bucket 1 is discharged from the bucket 1. In addition, when adhesion soil and other soil cannot be removed from the excavation hole 100 by one operation | work, adhesion soil etc. are removed from the excavation hole 100 by repeating this operation | work.

  After the adhered soil is removed from the excavation hole 100, a backfilling agent is supplied to the excavation hole 100, and the excavation hole 100 is backfilled. Finally, as shown in FIG. 14, the ground is leveled using a hydraulic excavator 95 or the like, and the operation is completed.

DESCRIPTION OF SYMBOLS 1 Bucket 2 Circumferential surface part 3 Bottom surface part 4 Taking in port 5 Segment 10 Casing for connection 20 Connection structure of bucket and connection casing 21 First connection structure 22 Inserted part 23 Groove part 24 Insertion path 25 Circumferential path 26 Closing member 31 Second connection structure 32 Projection body 33 Vertical member 34 Circumferential member 40 Stopper 50 Pile removal machine 51 Main hook 52 Auxiliary hook 55 Wire 60 Leader 65 Auger 70 Excavation casing 80 Residual pile 90 High lift work vehicle 95 Hydraulic excavator

Claims (6)

A connection structure between a bucket and a connection casing used to remove residual soil from a hole from which a remaining pile remaining in the ground is pulled out,
A first connection structure fixed to the bucket, and a second connection structure fixed to the connection casing and connected to the first connection structure,
The bucket is formed of an annular peripheral surface portion and an inclined surface provided on one end side in the axial direction of the peripheral surface portion, and is inclined from the peripheral edge toward the center, and has a tapered shape. A bottom portion with an intake port for taking in,
The first connection structure is fixed to the other end side in the axial direction of the peripheral surface portion, and the second connection structure is fixed to one end side in the axial direction of the connection casing,
The first connection structure and the second connection structure have a form in which one of them is fitted into the other,
On one outer peripheral surface of the first connection structure and the second connection structure, protrusions protruding outward in the radial direction are fixed at a plurality of positions in the circumferential direction,
In the other of the first connection structure and the second connection structure, an insertion portion for inserting the protrusion is formed at a position corresponding to the protrusion,
A connection structure between a bucket and a connection casing, wherein a stopper is provided between the insertion portion and the projection body in a form in which the projection body is inserted into the insertion portion. The protrusion is composed of a longitudinal member extending in the axial direction and a circumferential member extending from the longitudinal member to one side in the circumferential direction,
An insertion passage for inserting the protrusion in the axial direction on the inner surface of the insertion portion, and extends in the same direction as the direction in which the circumferential member extends at the back of the insertion passage, and the circumferential member is inserted. The connection structure between the bucket and the connection casing according to claim 1, wherein a circumferential passage is formed. The circumferential member has a form extending in the circumferential direction with a certain gap between the upper end of the first connection structure or the lower end of the second connection structure,
The bucket and the connection casing according to claim 2, wherein the insertion passage is formed in a form in which the protrusion is caused from either the upper end of the first connection structure or the lower end of the second connection structure. Connection structure.   The bucket and the connection according to any one of claims 1 to 3, wherein an insertion portion is formed in the first connection structure, and the protrusion is fixed to the second connection structure. Connection structure with casing. After excavating the outer peripheral surface of the remaining pile in the longitudinal direction of the remaining pile using a casing for excavation, a wire is hung on the remaining pile, the remaining pile is pulled up by pulling up the wire and the remaining pile is pulled. The excavation hole backfilling method of filling up the excavation hole after pumping up the residual soil present in the excavation hole after being extracted,
An attached soil removal step of removing the attached soil adhered to the outer peripheral surface of the pulled-out residual pile;
A connection step of connecting a bucket used for pumping up the residual soil remaining inside the hole after the residual pile is pulled out, and a connection casing connected to the bucket;
In the connecting step,
An annular peripheral surface portion and an inclined surface provided on one end side in the axial direction of the peripheral surface portion and inclined from the peripheral edge toward the center form a tapered shape. The bucket comprising at least a bottom surface portion having a mouth and an annular first connection structure fixed to the other end side in the axial direction of the peripheral surface portion and connected to one end side in the axial direction of the connection casing. When,
About the connection casing provided with the annular second connection structure fixed to the one end side in the axial direction and connected to the first connection structure,
Protrusions fixed to a plurality of circumferential positions on one outer peripheral surface of the first connection structure and the second connection structure and projecting outward in the radial direction are connected to the first connection structure and the first connection structure. In one of the two connection structures, one of the first connection structure and the second connection structure is fitted into the other by being inserted into an insertion portion provided at a position corresponding to the protrusion. ,
A drilling hole backfilling method in which a stopper is inserted between the inserted portion and the protrusion in a form in which the protrusion is inserted into the inserted portion. The protrusion is composed of a longitudinal member extending in the axial direction and a circumferential member extending from the longitudinal member to one side in the circumferential direction,
An insertion passage for inserting the protrusion in the axial direction on the inner surface of the insertion portion, and extends in the same direction as the direction in which the circumferential member extends at the back of the insertion passage, and the circumferential member is inserted. A circumferential passage is formed,
The connecting casing is brought close to the bucket, and the protrusion is inserted into the inserted portion.
Next, the connecting casing is rotated in a direction in which the circumferential member extends,
6. The excavation hole backfilling method according to claim 5, wherein the stopper is inserted into a gap formed between the vertical member of the protrusion and the inserted portion.

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