JP2022103982A - Casing head - Google Patents

Abstract

To provide a casing allowing an adequate amount of unnecessary object to be pulled up when pulling out a buried pile.SOLUTION: A casing head in a cylindrical shape connected on a lowest part of a casing used for pulling up a buried pile comprises: a pair of rods in a long bar shape in a vertical direction placed at an exterior side, each of rods being in a claw shape of which a tip has a curve expanding in an outer direction of the casing head; and a pair of covers placed on a lower part of the casing head and having a through hole through which each of rods passes, wherein when the rod is pushed downward, the tips of the rods are pushed into the casing head in an inner direction and a lower direction, and the covers rotate upon being pushed thereinto and close inwardly and downwardly of the casing head so as to cover a lower part of the casing head. Allowing the rod to reach an end position through being pushed in makes the covers cover the lower part of the casing head as much as a predetermined ratio showing a blocking ratio when the rods are placed on the end position.SELECTED DRAWING: Figure 3

Description

The present invention relates to a casing head.

When rebuilding a building, the existing building may be demolished and removed, or the piles buried in the ground may be pulled out. As a method of pulling out the buried pile, for example, there is a method of surrounding the buried pile with a tool called a casing, fixing the casing with a wire or a claw, and pulling out the casing.

The following patent documents 1 and 2 are available as techniques for pulling out buried piles.

Japanese Unexamined Patent Publication No. 2010-101107 Japanese Unexamined Patent Publication No. 2014-118736

However, in the method of fixing the buried pile with a claw and pulling it out, for example, it is not possible to pull up debris whose part of the buried hole is damaged, and unnecessary things remain in the buried hole after the buried pile is pulled out. On the other hand, in the method of completely covering the buried hole and pulling out, for example, excess earth and sand, muddy water, etc. are also pulled out, the force required for pulling out increases, and there is a risk that the heavy machine will tip over due to the load applied to the heavy machine. Becomes larger.

Therefore, one disclosure provides a casing head capable of pulling up an appropriate amount of unnecessary material in pulling out a buried pile.

A cylindrical casing head connected to the bottom of the casing surrounding the buried pile, used for pulling out the buried pile, with a pair of vertically long rod-shaped rods arranged outside the casing head. Each of the rods has a claw-shaped tip having a curve that bulges outward of the casing head, is located below the casing head, and has a pair of covers having through holes through which the rod passes. Is pushed downwards, the tip of the rod is pushed inward and downward of the casing head, and the cover is pushed into the rod to rotate and inwardly and downwardly of the casing head. Closed so as to cover the lower part of the casing head, the rod can be pushed to the final position, and the cover covers the lower part of the casing head when the rod is in the final position. The blockage rate indicating the ratio is a predetermined ratio.

According to one disclosure, when pulling out a buried pile, an appropriate amount of unnecessary material can be pulled up.

FIG. 1 is a diagram showing an example of a drawing process. FIG. 2 is a diagram showing an example of the configuration of the casing 30. FIG. 3 is a diagram showing an example of the configuration of the casing head 33. FIG. 4 is a diagram showing an example when the rod 101 is pushed in in the first stage. FIG. 5 is a diagram showing an example when the rod 101 is pushed in in the second stage. FIG. 6 is a diagram showing an example when the rod 101 is pushed in at the third stage.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the technical scope of the present invention is not limited to these embodiments, but extends to the matters described in the claims and their equivalents.

<Pulling process>
FIG. 1 is a diagram showing an example of a drawing process. The pulling out step is a step of pulling out the buried pile from the buried hole.

FIG. 1A is a diagram showing an example of a drilling process. The drilling step is performed, for example, by rotating the casing 30 with a heavy machine (drilling machine or the like) 10 as shown in FIG. The casing 30 is rotated, for example, by operating a motor operated in the heavy machine 10. In the drilling step, water is ejected from the tip of the casing 30 and the casing 30 is rotated to drill holes up to the tip of the buried pile 20.

FIG. 1B is a diagram showing an example of a drawing process. The heavy machine 10 pulls up the casing 30 via the wire. By pulling up the casing 30, the buried pile 20 surrounded by the casing 30 can be pulled up. The wire is connected (tied) to the upper end of the casing 30 with sufficient strength so that the connection cannot be disconnected by lifting.

Then, the backfill material is injected (cast) into the buried hole in accordance with the lifting of the casing 30 by the heavy machine 10. Injection of backfill material is performed by workers and other heavy equipment (not shown).

In the buried hole, for example, mud is present due to water introduced to facilitate the pulling out of the buried pile in the pulling out process, groundwater, or the like. Further, in the stand pipe 40 and the buried hole, for example, fragments of buried piles are present.

<Constituent example of casing 30>
FIG. 2 is a diagram showing a configuration example of the casing 30. The casing 30 is a cover for surrounding the buried pile, which is used when the buried pile is pulled out. The casing 30 is a cylindrical member having a hollow cylindrical shape. The casing 30 has an inner diameter larger than the outer diameter of the buried pile to be pulled out. Further, the casing 30 is made of a high-strength material such as steel so as to withstand the weight of the buried pile. The casing 30 is connected to the heavy machine by, for example, a wire or the like, is lifted together with the buried pile by the heavy machine 10, and is pulled out from the buried hole.

The casing 30 is composed of three types of parts: a casing top 31, a casing intermediate 32-1, 2, and a casing head 33. The casing top 31, the casing intermediates 32-1, 2 and the casing head 33 are each connected via a connecting portion.

The casing top 31 is a portion located at the uppermost portion of the casing 30. The casing top 31 has a connecting portion at the top for connecting via a speed reducer. Further, the casing top 31 has a connecting portion at the lower part for connecting to the casing intermediates 32-1, 2 and the casing head 33.

Casing intermediates 32-1, 2 (hereinafter, may be referred to as casing intermediate 32) have connecting portions at the upper part and the lower part. Although there are two casing intermediate 32s in the example of FIG. 2, the number of casing intermediate 32s is set according to the length of the buried pile to be pulled out. The casing intermediate 32 may not be provided if the buried pile is shorter than the predetermined length.

The casing head 33 is a portion located at the lowermost part of the casing 30. The casing head 33 has an upper portion having a connecting portion for connecting to the casing middle 32 or the casing top 31.

<Constituent example of casing head 33>
FIG. 3 is a diagram showing an example of the configuration of the casing head 33. FIG. 3A is a cross-sectional view of the casing head 33, and FIG. 3B is a view of the casing head 33 as viewed from below.

The casing head 33 has a rod 101, a rod 102, a cover 103, a cover 104, a drilling portion 105, and a drilling portion 106. Since the rods 101 and 102 have the same mechanism, the rods 101 will be described below unless otherwise specified. Further, since the cover 103 and the cover 104 have the same mechanism, the cover 103 will be described below unless otherwise specified.

The rod 101 (102) is a portion installed on the outer periphery of the casing head 33. The rod 101 (102) is, for example, a metal rod, and when a force is applied from above, the rod 101 (102) is pushed downward along the outer periphery of the casing head 33. The rod 101 (102) is, for example, a rod longer than the casing 30, and is installed along the outer periphery of the casing head 33 as well as the outer periphery of the casing intermediate 32 and the casing top 31.

The rod 101 (102) has a claw portion 1011 (1021) at the lower portion. The claw portion 1011 (1021) is connected to the main body of the rod 101 (102) via the fulcrum (pushing portion) 1012 (1022). The claw portion 1011 (1021) has a curved shape that swells in the outward direction of the casing head 33, and is interlocked with the rod 101 (102) that is pushed out downward, and the tip portion is pushed inward in the inner direction of the casing head 33.

The cover 103 (104) rotates about the rotation shaft 1032 (1042). The cover 103 (104) is in the open state in the initial state (the state of FIG. 3B, the state in which the rod 101 (102) is raised to the top). As shown in FIG. 3B, the cover 103 (104) is in a state in which the covers 103 and 104 do not fix buried piles, mud, etc., and the covers 103 and 104 are pushed in and rotated. , Transition to a closed state where buried piles and mud are fixed.

Further, the cover 103 (104) has a cover spherical surface 1031 (1041) on the outside in the open state. The cover spherical surface 1031 (1041) is approximately a quarter spherical surface. The cover 103 (104) is interlocked with the rod 101 (102) pushed downward, and rotates around the rotation shaft 1032 (106) so that the cover spherical surface 1031 (1041) enters inward, and the cover 104 (103) rotates. It constitutes a cover spherical surface 1041 (1031) and a substantially hemisphere. The approximate hemisphere is not a complete hemisphere, but a state close to a partially open hemisphere. An example of a substantially hemisphere will be described later.

Further, the cover 103 (104) can move in the vertical direction within the range of motion of the range of motion within the rotation shaft 1032 (1042). The range of motion in the rotating shaft 1032 (1042) is composed of, for example, a hole or groove installed in the casing head 33 and a shaft fixed to the cover 103 (104), and the shaft moves in the hole. Alternatively, the axis moves along the groove to secure the range of motion of the cover 103 (104).

<Operation example of casing head 33>
4 to 6 are views showing an example of the operation of the casing head 33 when the rod 101 is pushed down.

FIG. 4 is a diagram showing an example when the rod 101 is pushed in in the first stage. FIG. 4A is a cross-sectional view of the casing head 33, and FIG. 4B is a view of the casing head 33 as viewed from below. When the rod 101 is pushed in, the claw portion 1011 is pushed in the direction of the arrow A1 through the hole made in the cover 103. Then, the fulcrum 1012 is pushed to a position in contact with the cover 103. By forming the fulcrum 1012 at a portion larger than the hole (passing hole) formed in the cover 103, for example, the cover 103 can be pushed in without passing through the hole of the cover 103.

FIG. 5 is a diagram showing an example when the rod 101 is pushed in in the second stage. 5 (A) is a cross-sectional view of the casing head 33, and FIG. 5 (B) is a view of the casing head 33 as viewed from below. The claw portion 1011 is further pushed in the direction of the arrow A1 by further pushing the rod 101. Then, the cover 103 is pushed by the contacting fulcrum 1012 and rotates so as to close in the arrow A1 direction.

FIG. 6 is a diagram showing an example when the rod 101 is pushed in at the third stage. 6 (A) is a cross-sectional view of the casing head 33, and FIG. 6 (B) is a view of the casing head 33 as viewed from below. The claw portion 1011 is further pushed in the direction of the arrow A1 by further pushing the rod 101. Then, the cover 103 is further pushed by the contacting fulcrum 1012 and further rotated so as to close in the arrow A1 direction. When transitioning from the second stage to the third stage, the cover 103 rises upward along the range of motion in the rotation shaft 1032. Then, the cover 103 is in contact with the similarly raised cover 104 near the central portion, so that the cover 103 is not closed any more (it does not rotate in the direction of the arrow A1). The position of the rod 101 that does not close any more may be referred to as the final position.

The raising of the cover 103 described with reference to FIG. 6 may be realized by pushing in the rod 101 or by pulling up the rod 101. Which one is realized depends on, for example, the shape of the range of motion in the rotating shaft 1032, the shape and material of the claw portion 1011 and the position of the rotating shaft 1032.

The operator can pull out the buried pile by pushing the rod 101 up to the third stage and then pulling up the casing 30.

In the present embodiment, the casing head 33 covers most of the lower part of the casing head 33 with the covers 103 and 104, so that the buried pile can be prevented from falling out from the casing 30 when the casing 30 is pulled out.

Further, as shown in FIG. 6B, the casing head 33 is designed so that the covers 103 and 104 are not completely closed. As a result, fluid (water, mud, etc.) and small objects (sand, etc.) in the buried hole can be removed from the casing 30, the weight of the casing 30 including the buried pile is reduced, and the load applied to heavy machinery and the like is reduced. (Or power consumption) can be suppressed.

Further, as shown in FIG. 6B, the casing head 33 does not completely close the covers 103 and 104, but closes the casing head 33 by a predetermined ratio or more. As a result, large objects (fragments of buried piles, rocks, etc.) existing in the buried hole can be stored in the casing 30 and can be pulled out together with the buried pile.

<About the blockage rate of the cover>
As described above, the cover under the casing head 33 formed by the covers 103 and 104 does not allow large objects to pass through, but small objects and fluids need to pass through. The ratio of how much the covers 103 and 104 are blocked (blockage rate) is, for example, about 75% in FIG. 6, and by setting the blockage rate, mud, water, earth and sand, etc. remain in the casing 30. Although it is not pulled up as it is, debris of the buried pile remains in the casing 30 and is pulled up together with the buried pile. The occlusion rate of 75% is a numerical value obtained through experiments and experience. The blockage rate is not limited to 75%, and may be determined, for example, according to the material and size of the buried pile, the size and condition of the earth and sand in the buried hole, and the like.

As shown in FIG. 6, in the above-described embodiment, the covers 103 and 104 are closed to a state where they are not closed any more, but the closing rate may be changed for each work site. For example, withdrawal may be started in the state of FIG. 5 (second stage). In this case, a mechanism for fixing the rod 101 may be provided so that the rod 101 does not move.

<Relationship between claws and covers and buried piles>
The claw portion 1011 has, for example, a needle-shaped tip having a sharp tip, and by contacting the claw portion 1011 with the buried pile, the buried pile may be supported at the time of pulling out. Further, the claw portion 1011 may support the cover 103 from the outside, the cover 103 may be in contact with the buried pile, and the buried pile may be supported via the cover 103. That is, the claw portion 1011 and the cover 103 are interlocked, and when one is fixed (hardened so as not to move), the other may be fixed as well. The buried pile is in contact with and supported by one or both of the claw portion 1011 or the cover 103.

<About the rising of the cover>
The raising of the cover 103 in FIG. 6 may be executed at any timing. For example, the cover 103 may be raised in the state shown in FIG. That is, the rising of the covers 103 and 104 may be realized by the shapes of the covers 103 and 104 and the rotating shafts 1032 and 1042 that gradually rise in the process of closing the covers 103 and 104.

Further, the raising of the covers 103 and 104 may be realized by pushing the rod 101 to the final position and then pulling up the rod by the operator. As a result, when the claw portion 1011 or the cover 103 comes into contact with the buried pile, the buried pile is fixed in the casing 30.

By raising the cover 103, for example, a stronger force can be applied to the contact surface between the buried pile and the cover 103 or the claw portion 1011, and the buried pile can be fixed more strongly. Further, for example, when an object exists between the buried pile and the cover 103 or the claw portion 1011 and a space exists, the cover 103 rises to raise the space between the cover 103 or the claw portion 1011 and the buried pile. Can be made smaller, the force applied to the buried pile through the object can be increased, and the buried pile can be fixed more strongly.

10: Heavy machine 11: Heavy machine 30: Casing 31: Casing top 32: Casing middle 33: Casing head 40: Stand pipe 101: Rod 102: Rod 103: Cover 104: Cover 105: Drilling part 106: Drilling part 1011: Claw Part 1012: Supporting point 1021: Claw part 1022: Supporting point 1031: Cover spherical surface 1032: Rotating shaft 1041: Covering spherical surface 1042: Rotating shaft

Claims (5)

A cylindrical casing head connected to the bottom of the casing surrounding the buried pile, which is used for pulling out the buried pile.
A pair of vertically long rod-shaped rods arranged on the outside of the casing head,
Each of the rods has a claw shape having a curved tip whose tip bulges toward the outside of the casing head.
Located under the casing head, it has a pair of covers with through holes through which the rod passes.
When the rod is pushed downward,
The tip of the rod is pushed inward and downward of the casing head.
The cover rotates by being pushed into the rod, and closes toward the inside and the bottom of the casing head so as to cover the lower portion of the casing head.
The rod can be pushed to the final position and
The cover is a casing head in which, when the rod is in the final position, the closing rate indicating the ratio of covering the lower part of the casing head is a predetermined ratio. The casing head according to claim 1, wherein when the rod is pushed from the first position above the final position to the final position, the cover rises by a predetermined length. The casing head according to claim 1, wherein when the rod is pushed to the final position and then pulled up to a position where the rod can be pulled up, the cover is raised by a predetermined length. The casing head according to claim 1, wherein the gap created by the pair of covers at a predetermined ratio is large enough to allow the soil and mud of the soil in which the buried pile is to pass, although the fragments of the buried pile cannot pass through. Further, a push-in portion larger than the rod is installed at a predetermined position on the rod, and the cover has a passage hole through which the rod passes but does not pass through the push-in portion.
The rod is pushed in by the first distance, and the pushing portion comes into contact with the passing hole.
The casing head according to claim 1, wherein when the rod is further pushed in, the pushing portion does not pass through the passing hole, the cover is pushed in, and the cover is rotated.

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