JP7438532B2 - Holding jig for cylindrical parts - Google Patents

Description

The present invention relates to a holding jig for a cylindrical member, which is used when extracting a cylindrical member such as a pile or a casing buried in the soil.

Piles buried in the soil may be pulled out due to the demolition and removal of civil engineering structures. In such cases, after excavating the area around the pile using an excavation casing, a supporting wire is wrapped around the top of the pile to lift the pile to a specified height above the ground, and then the top of the pile is cut off. They are removed one after another (for example, see Patent Document 1 below).

Japanese Patent Application Publication No. 2007-197932

In the above-mentioned pull-out construction method, the pile is lifted from the ground by a predetermined height and is once held and fixed to the ground using a holding jig. The holding jig used in this case is a special jig that matches the outside diameter of the pile, so the worker must prepare many types of special jigs for each outside diameter of the pile, making the work complicated. There was a problem of increased work costs due to

The present invention has been made against the background of the above-mentioned circumstances, and has been made for the purpose of providing a holding jig for cylindrical members that is capable of holding well even cylindrical members having different outer diameters. be.

The present inventors have made extensive studies to solve the above problems, and as a result, have come up with the present invention as described below.
The holding jig for a cylindrical member according to the first aspect of the invention is defined as follows. That is,
A jig for holding a cylindrical member such as a pile or a casing buried in the soil when the cylindrical member is extracted, the jig comprising:
comprising a polygonal annular frame surrounding the outer periphery of the cylindrical member;
As a member constituting the frame,
a plurality of fixed length members having a bent shape and forming corners of the frame;
a holding member that holds a temporary fixing member that forms a straight portion of the frame and temporarily fixes the columnar member and the frame;
a plurality of spacers interposed between the fixed length member and the holding member,
The distance between the fixed length member and the holding member, which are connected via the spacer, is configured to be adjustable.

According to the holding jig for a cylindrical member of the first aspect defined in this way, the spacer interposed between the fixed length member and the holding member allows the size of the entire frame to be adjusted to the size of the cylindrical member. Since the adjustment can be made according to the outer diameter of the cylindrical member, it is possible to properly hold a plurality of cylindrical members having different outer diameters using one holding jig.
As the temporary fixing member, in addition to a wedge-shaped member tightly fitted between the cylindrical member and the holding member, a pin inserted into the circumferential surface of the cylindrical member or the like can be used.
As a spacer for adjusting the distance between the fixed length member and the holding member, it is possible to prepare a member having the same cross-sectional shape as the fixed length member and the holding member, and use a patch applied to these members from the outside as a spacer. can. That is, spacers of various lengths are prepared, and patches are used to fix the fixed length member and the spacer, and the spacer and the holding member, respectively.
The member fitable to the fixed length member and the holding member may also be a spacer. In this case, the diameter of the holder can be adjusted by adjusting the amount of fitting.

The second aspect of the invention is defined as follows. That is,
In the holding jig defined in the first aspect, the spacer is fitable with an end of the fixed length member and/or an end of the holding member, and the spacer is fitable with an end of the fixed length member and/or the holding member. However, they are configured to be able to be connected and fixed at different fitting depths.
In order to make the interval between the fixed length member and the holding member adjustable, it is possible to configure the spacer itself to be expandable and retractable, but like the holding jig of the second aspect, the fixed length member and the holding member The size of the entire frame can be easily adjusted by changing the fitting depth of the spacer with respect to the holding member.

The third aspect of the invention is defined as follows. That is,
In the holding jig specified in the second aspect, the spacer, the fixed length member, and/or the holding member each have through holes for connection formed therein, and these through holes are aligned so as to overlap with each other. By inserting a rod-shaped fixture, the fixed length member and the holding member are configured to be connected and fixed via the spacer, and
A plurality of the through holes are provided in the spacer at different positions in the longitudinal direction.
According to the holding jig of the third aspect defined in this way, the size of the frame can be adjusted in stages based on the plurality of through holes provided in the spacer. By associating the positions of the multiple through holes provided in the spacer with cylindrical members with different outer diameters, it is easier to adjust the size of the frame to match the outer diameter of the cylindrical member. can be done.

The frame of such a holding jig preferably has a hexagonal shape as a whole (fourth aspect). This is because the wedge member can be arranged to face the cylindrical member. If the frame is made into a polygonal shape, the wedge members will be placed opposite each other, but if the frame is made into a square shape, the bent fixed length member will be far away from the cylindrical member, which is not preferable from the viewpoint of exclusive area. Furthermore, the load applied to each wedge member becomes too large, making it difficult to ensure durability. On the other hand, if the frame is octagonal or more, the number of parts becomes too large, which is not preferable.

FIG. 1 is a perspective view of a holding jig according to a first embodiment of the present invention. 2(A) is a plan view of the frame shown in FIG. 1, and FIG. 2(B) is a sectional view of the holding member taken along the arrow line BB in FIG. 2(A). FIG. 3 is a partially exploded perspective view of the frame shown in FIG. 2. 4(A), FIG. 4(B), and FIG. 4(C) are diagrams each showing a frame whose size has been adjusted to match cylindrical members having different outer diameters. FIG. 5 is a diagram showing a state in which a cylindrical member is held using the holding jig shown in FIG. FIG. 6(A) is a plan view of a holding jig according to a second embodiment of the present invention, and FIG. 6(B) is a sectional view taken along the line BB in FIG. 6(A).

Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
FIG. 1 is a perspective view of a holding jig 1 for a columnar member according to a first embodiment of the present invention. The vertical direction in FIG. 1 is the same as the vertical direction when the holding jig 1 is actually used.
The holding jig 1 is used to temporarily hold the cylindrical member 3 (see Fig. 5), such as a pile or a casing buried in the soil, when the cylindrical member 3 is removed from the ground. It includes a frame 5 and a plurality of wedge-shaped members 4.

The wedge-shaped member 4 as a temporary fixing member is made of steel, has a first flat surface 11 and a second flat surface 12, and has a thickness that decreases from the upper end (base end) to the lower end (tip end). When viewed from the side, it forms an approximately right-angled triangle. The length L in the vertical direction is approximately the same as the height H (see FIG. 2(B)) of the holding member 23, which will be described later. Further, the thickness T at the upper end portion is approximately the same as the gap size S (see FIG. 2(A)) from the inner surface of the frame body 5 to the outer surface of the columnar member 3, which will be described later.

When the wedge-shaped member 4 is press-fitted between the cylindrical member 3 to be held and the frame 5, the inward first flat surface 11 is brought into contact with the outer surface of the cylindrical member 3, and the cylindrical member 3 Apply a radially inward force to the The reaction force at that time is received by the holding member 23 that the second flat surface 12 comes into contact with. The holding jig 1 of this embodiment includes six wedge-shaped members 4 and is configured to press the columnar member 3 from six different positions in the circumferential direction.
In addition, the "wedge-shaped member" in the present invention is a state in which the cylindrical member 3 and the frame 5 are interposed, and the same effect as a wedge is obtained, and a radially inward pressing force is applied to the cylindrical member 3. A member that can be acted upon.
In order to temporarily fix the frame 5 to the columnar member 3, a pin may be driven into the circumferential surface of the columnar member 3 in addition to the wedge-shaped member described above. The tip portion of this pin is held by a holding member.

The frame 5 is a polygonal annular member, and the columnar member 3 is accommodated in an inner area 20 of the frame 5. As shown in FIG. 2, the frame 5 of this embodiment has a hexagonal shape, and has six corner portions and six straight portions provided between adjacent corner portions. .

The frame body 5 includes a fixed length member 21, a holding member 23, and a spacer 25 as constituent members. As shown in FIG. 3, the fixed length member 21, the holding member 23, and the spacer 25 are each provided separately, and are connected and fixed by a fixture 27 made of bolts and nuts. In the frame body 5, as shown in FIG. 2(A), the fixed length member 21 and the holding member 23 are connected and fixed via a spacer 25 at a distance P, but in this embodiment, as will be described later. The interval P is adjustable.

The fixed length members 21 constituting the corners of the frame 5 are made of a pair of square cylindrical steel materials that are welded together so as to have a bent shape in plan view. Openings 35, 35 are formed at both ends of the fixed length member 21, respectively, into which the spacer 25 can be inserted, and the fixture 27 is inserted into the opposing side walls (inner wall 31 and outer wall 32). A through hole 36 is formed for this purpose.

The holding member 23 constituting the straight part of the frame 5 includes a straight pipe part 40 that extends linearly, a receiving part main body 50 that projects from the inner wall 41 of the straight pipe part 40 toward the inside of the frame 5, It is equipped with
The straight tube section 40 is made of a square tube-shaped steel material, and openings 45, 45 are formed at both ends of the straight tube section 40, respectively, into which the spacer 25 can be inserted. This opening 45 is desirably formed in the same size and shape as the opening 35 of the fixed length member 21. A through hole 46 through which the fixture 27 is inserted is formed in opposing side walls (inner wall 41 and outer wall 42) at the end of the straight pipe section 40.

The receiving portion main body 50 is a portion that directly receives the load from the wedge-shaped member 4, and is formed in the longitudinal center of the inner wall 41 of the straight pipe portion 40. The receiving portion main body 50 is formed with an inclined surface 52 that is spaced apart from the inner wall 41 as it goes from the upper surface to the lower surface of the straight pipe portion 40 . As shown in FIG. 2B, this inclined surface 52 has an inclination such that when the second flat surface 12 of the wedge-shaped member 4 is in contact with it, the first flat surface 11 of the wedge-shaped member 4 is approximately vertical. stipulated.

The spacer 25 is a member that is interposed between the fixed length member 21 and the holding member 23 and is used to adjust the distance P between the fixed length member 21 and the holding member 23. As shown in FIG. 3, the spacer 25 is made of a linearly extending H-shaped steel, and one end of the spacer 25 is connected to the end opening 35 of the fixed length member 21, and the other end is connected to the holding member 23. It can be inserted into the end opening 45. As shown in FIG. 3, a plurality of through holes 65 through which the fixture 27 passes are formed along the longitudinal direction at opposing positions of the pair of flanges 61, 61. Through holes 65a, 65b, and 65c are formed in the spacer 25 along the longitudinal direction at a portion of the spacer 25 that is held in a fit state inside the fixed length member 21. Similarly, through holes 65a, 65b, and 65c are formed along the longitudinal direction in the portions of the holding member 23 that are held in an internally fitted state. The positions of these through-holes 65a, 65b, and 65c are determined so as to obtain a frame 5 of a suitable size to hold the cylindrical members 3A, 3B, and 3C (see FIG. 4) having different outer diameters, respectively. ing.

As described above, the frame body 5 including the fixed length member 21, the holding member 23, and the spacer 25 as constituent members has one end of the spacer 25 held inside the fixed length member 21 in an internally fitted state. The fixing tool 27 is inserted into the through holes 65 and 36 of the overlapping spacer 25 and the fixed length member 21, respectively, and the other end of the spacer 25 is held inside the holding member 23, and then the spacer 25 and the fixed length member 21 are overlapped. By inserting the fixture 27 into the through holes 65 and 46 of the spacer 25 and the holding member 23, the fixed length member 21, the holding member 23, and the spacer 25 are interconnected, and the circumference of the frame 5 is That is, the size of the frame 5 is defined.

Here, the size of the frame 5 is determined in relation to the cylindrical member 3 to be held. In order to properly hold the columnar member 3, the gap size S from the inner surface of the frame 5 (specifically, the holding member 23 of the frame 5) shown in FIG. 2(A) to the outer surface of the columnar member 3 must be wedge-shaped. It is important that the thickness T be approximately the same as the thickness T of the member 4.

Here, in this embodiment, the positions of the plurality of through holes 65a, 65b, 65c of the spacer 25 are determined to correspond to the cylindrical members 3A, 3B, 3C having different outer diameters. The distance P between the fixed length member 21 and the holding member 23 can be adjusted by changing the fitting depth and changing the through hole used during connection and fixation. Thereby, the circumferential length of the frame 5 can be changed to a circumferential length that can accommodate each of the columnar members 3A, 3B, and 3C.

FIG. 4 is a diagram showing a state in which the circumferential length, that is, the size, of the frame body 5 is changed in accordance with the outer diameter of the cylindrical members 3A, 3B, and 3C to be held. The outer diameters of the cylindrical members 3A, 3B, and 3C to be held are respectively D1, D2, and D3 (D1<D2<D3).

As shown in FIG. 4(A), when holding the cylindrical member 3A having the outer diameter D1, the fixed length member 21 and the holding member are By connecting and fixing 23, the gap size S from the inner surface of the frame body 5 to the outer surface of the columnar member 3A can be suitably secured.

Further, as shown in FIG. 4(B), when holding a cylindrical member 3B having a larger outer diameter than the cylindrical member 3A, the fitting depth of the spacer 25 is set to be greater than that in FIG. 4(A). By making the hole shallow and connecting and fixing the fixed length member 21 and the holding member 23 using the through hole 65b formed in the spacer 25, the circumference of the frame 5 becomes longer (the diameter of the entire frame is expanded). , the gap size S from the inner surface of the frame body 5 to the outer surface of the columnar member 3B can be suitably secured.

When holding a cylindrical member 3C having an outer diameter larger than that of the cylindrical member 3B, as shown in FIG. By further making it shallower and connecting and fixing the fixed length member 21 and the holding member 23 using the through hole 65c of the spacer, the gap size S from the inner surface of the frame body 5 to the outer surface of the columnar member 3C is appropriately secured. can do.

Next, the operation of holding the columnar member 3 using the holding jig 1 of this embodiment will be explained.
The frame body 5 whose size has been adjusted according to the outer diameter of the columnar member 3 as described above is placed on the ground G so as to surround the outer circumference of the columnar member 3, as shown in FIG. When six wedge-shaped members 4 are pushed between the holding member 23 of the frame 5 and the columnar member 3 at different positions in the circumferential direction, the columnar member 3 is moved radially inward by each wedge-shaped member 4 due to the wedge effect. It is pressed and held firmly.

As described above, in the holding jig 1 of this embodiment, the distance P between the fixed length member 21 and the holding member 23 connected via the spacer 25 is configured to be adjustable, so that the entire frame 5 can be adjusted. The size can be adjusted according to the outer diameter of the cylindrical member 3. Therefore, even a plurality of cylindrical members 3A, 3B, and 3C having different outer diameters can be held well using one holding jig 1.

In the holding jig 1 of this embodiment, the spacer 25 can be fitted to the end of the fixed length member 21 and the end of the holding member 23, and the spacer 25 can be fitted to the fixed length member 21 and the holding member 23. It is configured so that it can be fixed at different fitting depths.
Therefore, according to the holding jig 1, the size of the entire frame 5 can be easily adjusted by changing the fitting depth of the spacer 25 with respect to the fixed length member 21 and the holding member 23.

In addition, in the holding jig 1 of this embodiment, the spacer 25, the fixed length member 21, and the holding member 23 are formed with through holes 65, 36, and 46 for connection, respectively, and the spacer 25 is further provided at different positions in the longitudinal direction. A plurality of through holes 65 are provided. Therefore, according to the holding jig 1, the size of the frame can be adjusted in stages based on the plurality of through holes provided in the spacer 25. By associating the positions of the plurality of through holes 65a, 65b, and 65c provided in the spacer 25 with cylindrical members having different outer diameters, it is possible to adjust the size of the frame 5 of the holding jig 1. Work can be done easily.

(Second embodiment)
FIG. 6 shows a holding jig 1B according to a second embodiment of the present invention. The holding jig 1B includes a hexagonal frame 5B, and the frame 5B includes a fixed length member 21, a holding member 23B, and a spacer 25 as constituent members. A plurality of pressing pieces 75 are provided in place of the wedge-shaped member 4 of the first embodiment. It should be noted that among the constituent parts of the holding jig 1B, the same components as those of the holding jig 1 according to the first embodiment are indicated using the same reference numerals, and the explanation thereof will be omitted.

In the holding jig 1B, a shaft body 72 is supported by a pair of support plates 70, 70 that are erected on the upper surface of the straight pipe portion 40 of the holding member 23B, and a disk-shaped pressing piece 75 is mounted around this shaft body 72. Rotatably mounted. The pressing piece 75 is attached eccentrically with respect to the axis X of the shaft body 72, and as shown in FIG. 6(B), when the pressing piece 75 is rotated around the shaft body 72, the cylindrical member The thickness t of the pressing piece 75 interposed between the cylindrical member 3 and the holding member 23B is increased, and a radially inward pressing force is applied to the columnar member 3 similarly to the wedge-shaped member 4 of the first embodiment. be able to. That is, this pressing piece 75 also corresponds to the wedge-shaped member of the present invention. Note that 76 is an operating shaft for rotating the pressing piece 75.

Also in the holding jig 1B of this embodiment configured in this way, the interval P between the fixed length member 21 and the holding member 23B connected via the spacer 25 is configured to be adjustable, so that the frame body The overall size of the cylindrical member 5B can be adjusted to match the outer diameter of the cylindrical member 3, and even a plurality of cylindrical members with different outer diameters can be well held using one holding jig 1B. It is possible.

In the embodiment described above, the fixed length member and the holding member are made of square timber, the spacer is made of H steel, and the latter is inserted into the former.
The fixed length member and the holding member may be made of H steel, the spacer may be made of square material, and the former may be inserted into the latter.
Furthermore, it is possible to minimize the number of square bars (or H steel) for the fixed length member and the holding member, and to employ square bars (or H steel) with the same diameter (cross-sectional shape) as the spacer. When such a configuration is adopted, a steel plate (patch) is applied to the outer surface of the end of the fixed length member and one end of the spacer and fixed with bolts, etc., and the steel plate (patch) is applied to the end of the fixed length member and the outer surface of one end of the spacer, and the steel plate (patch) is attached to the other end of the spacer and the end of the holding member. patch) and secure with bolts, etc.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to these descriptions. For example, the annular frame included in the holding jig of the present invention is not limited to a hexagonal shape, and may have a polygonal shape other than a hexagon as long as it is triangular or larger. Further, in the above embodiment, the spacer is provided separately from the fixed length member and the holding member, but the spacer is integrally joined to either the fixed length member or the holding member, and the spacer is provided separately from the fixed length member or the holding member. It is also possible to construct the member so that it can be fitted to the other end of the member. Further, in the above embodiment, the spacer can be fitted inside the fixed length member and the holding member, but it is also possible to configure the spacer so that it can be fitted outside the fixed length member and the holding member. This invention includes various modifications that can be easily conceived by those skilled in the art without departing from the scope of the claims.

1, 1B holding jig 3, 3A, 3B, 3C columnar member 4 wedge-shaped member 5, 5B frame 21 fixed length member 23, 23B holding member 25 spacer 27 fixture 36 through hole of fixed length member 46 holding member Through holes 65, 65a, 65b, 65c Through holes of spacer 75 Pressing piece (wedge-shaped member)
P interval

Claims (4)

A jig for holding a cylindrical member such as a pile or a casing buried in the soil when the cylindrical member is extracted, the jig comprising:
comprising a polygonal annular frame surrounding the outer periphery of the cylindrical member;
As a member constituting the frame,
a plurality of fixed length members having a bent shape and forming corners of the frame;
a holding member that holds a temporary fixing member that forms a straight portion of the frame and temporarily fixes the columnar member and the frame;
a plurality of spacers interposed between the fixed length member and the holding member,
The distance between the fixed length member and the holding member connected via the spacer is configured to be adjustable.
A holding jig for a cylindrical member, characterized by: The spacer can be fitted with an end of the fixed length member and/or an end of the holding member, and can be connected and fixed to the fixed length member and/or the holding member at different fitting depths. is composed of
The holding jig for a cylindrical member according to claim 1. Connection through holes are formed in each of the spacer, the fixed length member, and/or the holding member, and by inserting a rod-shaped fixture into these through holes that are aligned so as to overlap each other, the spacer The fixed length member and the holding member are configured to be connected and fixed via the
The spacer is provided with a plurality of through holes at different positions in the longitudinal direction,
The holding jig for a columnar member according to claim 2. The holding jig according to any one of claims 1 to 3, wherein the fixed length member is bent at 120 degrees, and the frame has a hexagonal shape as a whole.

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