JP2012107397A - Column for load resistance structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a column's strength and toughness and to achieve the recycling and reuse of the column.SOLUTION: A column for load resistance structure is provided with a hollow column body 11, noncompressible filling granular materials 30 packed in the column body 11, a plug lid 20 installed in the end opening of the column body 11 to be slidable and for closing the end opening and pressing the filling granular materials 30, and a tension member 40 of which end is fixed to the plug lid 20 and that applies pressure force to the filling granular materials 30 through the plug lid 20. The column forms a composite structure by integrating a hard lump 31 formed by tensioning the tension member 40 and compacting the filling granular materials 30 with the column body 11 restraining the hard lump 31.

Description

  The present invention relates to a strut of an impact absorbing fence or an impact absorbing dam body (hereinafter referred to as a “load bearing structure”) that absorbs impacts such as falling rocks, landslides, and avalanches.

2. Description of the Related Art An impact-absorbing fence made up of struts erected at a predetermined interval and a protective net laid horizontally between the struts is widely known.
The energy absorption amount of the conventional shock absorbing fence is basically proportional to the deformation amount of the protective net and the support column.
On the other hand, when installing an impact absorbing fence on the side of a traffic route such as a road or a railroad, it is required to suppress the deformation amount of the support column to be small. For this purpose, a CFT-structured column in which a steel pipe is filled with a cement-based solidifying material such as mortar to increase the bending strength is used (Patent Document 1).

JP 2009-24479 A

The conventional support has the following problems.
(1) In order to suppress the deformation amount of the support column, it is necessary to increase the diameter and increase the section modulus of the support column.
When the section modulus of the support is increased, the weight of the support becomes heavy, and not only handling such as transportation and installation becomes inconvenient, but also the cost of the support increases.
(2) When a steel pipe is filled with mortar and a strut is constructed on site, a curing period is required, so that the entire construction period is extended and construction is hindered.
(3) When the strut is deformed in response to the impact, the cement-based solidified material at the bending deformation portion is crushed in the steel pipe, the strength is extremely lowered, and the initial strut strength cannot be maintained.
For this reason, if the impact repeatedly acts, the initial strut strength cannot be maintained after the second time and the function as the shock absorbing fence is lost.
(4) When the strut is deformed, it is replaced with a new strut, but the removed strut is integrated with the steel pipe and the cementitious solidified material inside, so the materials that make up the strut must be recycled and reused. Is impossible.

The present invention has been made in view of the above points, and an object of the present invention is to provide at least one of the following columns for an impact absorbing fence.
(1) The strut strength and toughness are greatly improved.
(2) Recycling and reuse of the materials that make up the column.
(3) Excellent on-site handling, easy construction and low cost.

1st invention of this application is a support | pillar for load-bearing structures, Comprising: A hollow support | pillar main body, the incompressible medium-packed granular material with which it filled in the support | pillar main body, and the end part opening of a support | pillar main body are slidable A stopper lid that is attached and closes the end opening to pressurize the intermediate filler, and a tension member that fixes the end to the stopper lid and applies pressure to the intermediate filler via the stopper lid. The hard mass formed by tensioning the tension material and compacting the medium-filled granules and the column main body that restrains the hard mass are integrated to form a composite structure.
According to a second invention of the present application, in the first invention, the stopper lid includes a small-diameter portion that can be inserted into the end opening of the column main body, and a large-diameter portion that cannot be inserted into the end opening of the column main body. It is characterized by that.
According to a third invention of the present application, in the first invention, the stopper lid includes a small-diameter portion that can be inserted into an end opening of the column main body, and the stopper lid is filled with particles as the column main body is bent. It is characterized by pressurizing the body.
A fourth invention of the present application is characterized in that, in any one of the first to third inventions, the inside packed granule is any one of a fine aggregate, a steel ball, and a solidified granule group of waste.
According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the load-bearing structure is an impact absorbing fence.

The present invention can obtain the following effects.
(1) The strut according to the present invention is a composite structure in which a hard lump formed by tensioning a tension material and compacting an inside packed granule and a strut body that restrains the hard lump are integrated. Not only prestress is acting.
Therefore, the bending strength and toughness that are remarkably high can be exhibited compared with the conventional mortar filling steel pipe.
(2) When the tension introduced in the tensile material is released, the binding of the medium-packed granules is released, and the columnar hard mass can be disassembled. Therefore, it is possible to reuse and recycle by separating and collecting the column main body and the middle packed particles constituting the column.
(3) It is not necessary to apply any special additional processing to the column body, and a commercially available steel pipe can be used as it is.
Therefore, not only can the cost of the support column be reduced, but also the assembly time and cost of the support column can be reduced.

The model figure of the support | pillar which abbreviate | omitted the middle which concerns on Example 1 of this invention Top view of the column Sectional view of III-III in Fig. 1 Explanatory drawing of manufacturing method of support Explanatory drawing of manufacturing method of support Model diagram of support column with intermediate omitted according to embodiment 2 of the present invention Explanatory drawing of the upper part of the column when the column is deformed

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(1) Outline of support column FIGS. 1 to 4 show an example of a support column 10 according to the present invention.
The column 10 includes a hollow column body 11, a plug lid 20 that closes the opening at the end of the column body 11, an incompressible medium filling 30 filled in the column body 11, and the plug lid 20. And a tension member 40 that applies a compressive force to the medium-packed granules 30.
The stopper lid 20 is slidably attached to the end opening of the column body 11 and encloses the medium packed granule 30, and the tensile material 40 fixes the end to the stopper lid 20, and the inside via the stopper lid 20. The packed body 30 is pressurized.
The strut 10 according to the present invention has a composite structure in which a hard mass 31 formed by tensioning a tension member 40 and compacting an inside packed granule 30 and a strut body 11 that restrains the hard mass 31 are integrated. It is what.

(2) Column body 11 The column body 11 is a hollow tube such as a steel pipe, and is set to an appropriate length according to the installation height of a load-bearing structure such as an impact absorbing fence.
The cross-sectional shape of the column main body 11 is desirably a circular shape in terms of performance, but may be an elliptical shape or a polygonal shape.

  Along with the simplification of the column main body 11, it is possible to decorate the outer surface of the column main body 11 by coating or coloring various decorative materials. For example, if a decoration made of pseudo-wood is applied to the outer surface of the column main body 11, the shock absorbing fence can be harmonized with the surrounding environment.

(3) Plug Lid The plug lid 20 is a member having both a function as a lid material for encapsulating the medium packed granules 30 in the column main body 11 and a function for pressurizing the enclosed medium packed granules 30. The plug lid 20 of this example is a short column having a different diameter, has a small diameter portion 21 and a large diameter portion 22, and has a through hole 23 penetrating through the axis.

  The small-diameter portion 21 that pressurizes the intermediate packed granules 30 is formed to have the same diameter as or slightly smaller than the diameter of the end opening of the column main body 11, and can be inserted into the end opening of the column main body 11.

  The large-diameter portion 22 is larger in diameter than the small-diameter portion 21 and has a diameter that cannot be inserted into the end opening of the column main body 11. The insertion depth of the plug lid 20 is limited by the stepped portion of the small-diameter portion 21 and the large-diameter portion 22 coming into contact with the opening end portion of the column main body 11.

(4) Medium-packed granules In the present invention, the medium-packed granules 30 are sealed in the column main body 11 in a compacted state in order to increase the strength and toughness of the columns 10.

The inside packed granules 30 are incompressible granules, and for example, fine aggregates such as single grain crushed stone and sand, steel balls, or hard granules obtained by solidifying various wastes can be used.
There are no particular restrictions on the particle size of the medium-filled granules 30. Moreover, although the inside-packed granule 30 may be comprised only by a single particle size, you may use the mixture of the multiple types of granule from which a particle size differs.

  The reason why the incompressible medium packed particles 30 are used instead of the cement-based solidified material is to allow the displacement of the medium packed particles 30 when the column main body 11 is deformed to improve the toughness of the columns 10 and to the environment. This is because the column 10 can be recycled and reused in consideration.

(5) Tensile material The tensile material 40 that applies compressive force to the packed solid body 30 via the plug lid 20 includes PC strands, Rope such as strength fiber can be used.

  The fixing device 41 for fixing the end of the tension member 40 is appropriately selected according to the type of the tension member 40. For example, in the case where the tension member 40 is a rod having a male thread, it can be screwed into the rod. A nut can be applied, and when the tension member 40 is a rope member, a gripper capable of gripping the rope member is applied.

  As a method of applying tension to the tension member 40, the fixing device 41 is rotated to tighten the stopper lid 20, or the tension member 40 is tensioned using a tension jack (not shown) to tighten the stopper lid 20. Thereafter, a method of attaching and fixing the fixing tool 41 to the exposed end portion of the tension member 40 protruding from the plug lid 20 can be employed.

  Further, in this example, the case where one tension member 40 is arranged on the support column 10 is shown, but the number of the tension members 40 may be plural, and the arrangement position of the tension member 40 is also limited to the axis of the support column 10. Alternatively, it may be arranged concentrically with a position deviated from the axis of the support column 10, and the number and position of the tension members 40 are appropriately selected in consideration of the usage of the support column 10 and the direction of the external force acting on the support column 10. To do.

  The manufacturing method of the support | pillar 10 is demonstrated based on FIG.

(1) Filling medium-filled granules FIG. 4 shows a process of filling the medium-filled granules 30 from the upper opening of the column main body 11 which is vertically placed with the lower end closed by the stopper lid 20.
A tension member 40 is disposed in the column main body 11, and the inside packed granule 30 is filled in almost the entire region in the column main body 11.
When filling the intermediate packed particles 30, it is desirable to make the gap between the intermediate packed particles 30 as small as possible by applying vibration to the column main body 11 or the intermediate packed particles 30.

(2) Pressurization of medium packed granules FIG. 5 shows a process of tensioning the tension member 40 and pressurizing the medium packed granules 30 in the column main body 11.
The tension member 40 protruding from the upper part of the column main body 11 is covered with a separate plug lid 20 through the through hole 23, and the small diameter portion 21 of the plug lid 20 is inserted into the upper end opening of the column main body 11.
Subsequently, after tensioning the tension member 40 with a predetermined force, the end portion of the tension member 40 is fixed with the fixing tool 41 and a predetermined tension force is introduced into the tension member 40.

The arrows in FIG. 5 indicate the pressurizing force that pressurizes the medium packed granules 30 through the plug lid 20.
When the stopper lid 20 compresses the countless medium-filled granules 30, the rough gaps between the medium-filled granules 30 change to solid.
The inside packed granular material 30 that is an incompressible material is constrained by the column main body 11 and has no escape space. Therefore, the restraining pressure of the medium packed grain 30 increases in proportion to the tension of the tension member 40.
The restraining pressure of the intermediate packed granules 30 is determined by the filling amount of the intermediate packed granules 30 in the column main body 11 and the tension of the tension member 40.

(3) Agglomeration of medium-filled granule FIG. 1 shows a finished product of a column 10 manufactured by introducing a predetermined tension force into the tensile material 40.
Since the inside-packed granules 30 are incompressible granules, the granules themselves do not deform, but transmit pressure to each other, and the gap between the granules is reduced to the limit.
The group of intermediate packed particles 30 before pressurization was not related to each other, but by being pressed in a state of being constrained by the column main body 11, a binding force is generated between the intermediate packed granules 30; Innumerable medium-packed granules 30 are changed to hard lump 31.

  In this way, the strut body 10 and the pillar-shaped hard mass 31 formed by compacting the inside packed granules 30 inside the strut body 11 are obtained as the composite strut 10.

  The support column 10 may be manufactured at a site where the support column 10 is installed by loading each material constituting the support column 10 in addition to manufacturing the column 10 in a factory with a good environment.

(4) About the characteristic of the support | pillar As mentioned above, the support | pillar 10 which concerns on this invention is the synthesis | combination by the column-shaped hard lump 31 formed by compacting the inside filling granule 30 inside the support | pillar main body 11 and the support | pillar body 11. It is a structure.
Furthermore, the tension force introduced into the tension member 40 acts as a prestress on the column main body 11.
Therefore, the strut 10 according to the present invention can exhibit much higher bending strength and toughness than a conventional mortar-filled steel pipe.
This will be described in detail below.

Innumerable medium-filled granules 30 enclosed in the column main body 11 are not solidified unlike the cement-based solidified material. The innumerable medium-filled granules 30 are separated and independent, and are merely integrated due to factors of external force.
Therefore, when a bending force is applied to the support column 10, the force is transmitted to the whole packed solid body 30 and is supported by the entire support column 10 by the restraining effect of the support column body 11.

Further, when a bending force greater than the strength of the support column 10 is applied, the support column body 11 is bent and deformed, but the inner packed particle 30 is allowed to be deformed while being displaced without being damaged.
While the column 10 is bending deformed, the countless medium-filled granules 30 maintain the columnar hard mass 31 and the tension introduced into the tensile material 40 is also maintained, so that the initial strength of the column 10 is substantially reduced. It is possible to continue as it is.

  As described above, the strut 10 according to the present invention can avoid the sudden decrease in strength of the strut 10 even when an excessive bending force is applied, and the strength and toughness of the strut 10 are greatly improved.

Furthermore, since the support | pillar 10 which concerns on this invention can exhibit high intensity | strength as a synthetic | combination structure, without using a cement-type solidification material, it can manufacture a diameter small and low cost compared with the conventional support | pillar.
Therefore, the handling property of the support column 10 is excellent and easy to install.

(5) Recycling and reuse of the support column When the support column 10 is deformed, it is replaced with a new support column 10.
The removed deformed support column 10 releases the tension introduced into the tension member 40, and when the stopper lid 20 is removed from the support column main body 11, the coupling of the medium packed granules 30 is released and the columnar hard mass 31 is disassembled. The
By releasing the tension of the tension member 40 in this manner, the medium packed granules 30 can be easily taken out from the column main body 11, so that the column main body 11 and the internal medium packed particles 30 can be separated and recovered.
The collected medium-filled granules 30 can be reused for another column 10 and the collected column main body 11 can be recycled.

  6 and 7, the column 10 according to the second embodiment will be described. In the description, the same portions as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

(1) Strut In this embodiment, the hollow strut main body 11, the plug lid that closes the opening of the end of the strut main body 11, the filling filler 30 filled in the strut main body 11, and the plug lid Although the structure of the support column 10 is composed of the tension member 40 that applies the compressive force to the medium packed granule 30, it is the same as in the first embodiment. When the end opening is closed and the support column 10 is bent and deformed, the compressive force of the filling solid body 30 by the plug lid 25 is increased.

FIG. 6 shows a finished product of the column 10 manufactured by introducing a predetermined tension force to the tension member 40.
The innumerable medium-filled granules 30 filled in the column main body 11 are formed by an irregularly shaped plug lid 20 mounted on the other (lower) of the column main body 11 and a plug lid 25 mounted on one (upper) of the column main body 11. The columnar hard lump 31 is formed by being compressed.

  Reference numeral 42 in FIG. 6 is a joint tool that connects the anchor 43 fixed in the ground and the lower end of the tension member 40, and the lower end of the column 10 is connected to the anchor 43 through the joint tool 42.

  In addition to the method of connecting to the anchor 43, the standing means of the pillar 10 may be erected by burying the lower part of the pillar 10.

(2) Plug lid The plug lid 25 is composed of a short columnar small-diameter portion 21, and has a through hole 23 at its axis.
The small diameter portion 21 is formed to have the same diameter as or slightly smaller than the diameter of the end opening of the column main body 11, and can be inserted into the end opening of the column main body 11.
In this example, a plug lid 25 is attached to one (upper) end opening of the column main body 11, and a deformed plug lid 20 having an insertion depth restriction is attached to the other (lower) end opening of the column main body 11. However, it goes without saying that the plug lids 25 may be attached to both end openings of the column main body 11.

(3) Characteristic of the strut The basic characteristic of the strut 10 in this embodiment is the same as that of the first embodiment described above, but when the strut 10 is bent and deformed, The compressive force of the medium packed granules 30 is increased by the pressurizing operation.

When the support column 10 is bent and deformed, the tensile force of the tensile member 40 increases, and the tensile force of the tensile member 40 is transmitted to the plug lids 20 and 25 locked at both ends.
The plug lid 20 of different diameters locked to the lower end of the tension member 40 has a stepped portion between the small diameter portion 21 and the large diameter portion 22 abutting against the opening end portion of the column main body 11, and further insertion is restricted. Yes.
In the plug lid 25 that is locked to the upper end of the tension member 40, there is no step that contacts the open end of the column main body 11. Therefore, when the tensile force of the tension member 40 increases in proportion to the amount of bending deformation of the column 10, the plug lid 25 enters the column main body 11, and the pressure applied to the filling solid body 30 increases.

  As described above, in this embodiment, the bending strength and toughness when the support column 10 is bent and deformed as compared with Example 1 only by attaching the slidable stopper lid 20 to one or both of the support column main bodies 11. The advantage that is further increased is obtained.

10... Column 11... Column body 20 and 25 .. Cap lid 21... Small diameter portion 22... Large diameter portion 23. Granule 31 ... Hard mass 40 ... Tensile material 41 ... Fixing tool

Claims (5)

A strut for a load-bearing structure,
A hollow column body;
Incompressible medium-filled granules filled in the prop body,
A stopper lid that is slidably attached to the end opening of the column main body, closes the end opening, and pressurizes the packed particles;
A tension member that fixes an end portion to the stopper lid and applies pressure to the inside packed particles through the stopper lid;
It is characterized in that a hard lump formed by tensioning the tension material and compacting the packed solid body and a column main body constraining the hard lump are integrated into a synthetic structure,
Prop for load-bearing structures.   The load-carrying structure according to claim 1, wherein the stopper lid includes a small-diameter portion that can be inserted into the end opening of the column main body, and a large-diameter portion that cannot be inserted into the end opening of the column main body. Prop for things.   The plug lid according to claim 1, wherein the plug lid includes a small diameter portion that can be inserted into an end opening of the column main body, and the plug lid pressurizes the filling particles as the column main body is bent. Supports for load-bearing structures.   The load-resistant structure according to any one of claims 1 to 3, wherein the inside packed granules are any one of a fine aggregate, a steel ball, and a solidified granular group of waste. Prop.   The strut for a load-bearing structure according to any one of claims 1 to 4, wherein the load-bearing structure is an impact absorbing fence.

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