JP2004124426A - Closed structure of concrete fillable efficiency recognition hole of cft - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a closed structure of a concrete fillable efficiency recognition hole of a CFT capable of eliminating the removal work of a pin material from the fillable efficiency recognition hole after the solidification of infilled concrete while reducing a working burden. <P>SOLUTION: The pin material 5 closing the concrete fillable efficiency recognition hole 4 formed in a steel pipe 2 of a CFT column 1 is formed of a material having such the nature that it is melted by heat in the case of fire to open the recognition hole 4. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a closed structure for a concrete filling confirmation hole of a CFT (concrete filled steel pipe).
[0002]
[Prior art]
For example, in the case of CFT columns, it is necessary to check whether concrete is properly filled in the steel pipe through a confirmation hole formed in the peripheral wall of the steel pipe when the concrete pressed into the steel pipe has not yet hardened. However, after confirming the filling property, this confirmation hole is closed with a plug material so that the filled concrete does not leak out, and furthermore, after the filled concrete has hardened, it is possible to release steam from the filled concrete in the event of a fire. It is necessary to remove the plug material from the confirmation hole so that it can be performed. Conventionally, a wooden plug is used as such a plug material, or a nut is previously attached around the confirmation hole by welding, and a bolt as a plug material is screwed to the nut to close the confirmation hole. Was to be done.
[0003]
[Problems to be solved by the invention]
However, the above structure has a problem in that the plug must be removed after the plug is attached to the confirmation hole, and the operation is troublesome. Especially when the confirmation hole is located at a high place, it is necessary to climb the high place to remove the plug only to remove the plug, and there is also a problem that the safety of work may be concerned. Was.
[0004]
SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, the present invention can eliminate the work of removing the plug material after the hardening of the filled concrete, and can reduce the work load. It is an object to provide a structure.
[0005]
[Means for Solving the Problems]
The above problem is characterized in that the plug material closing the concrete filling confirmation hole provided in the CFT steel pipe is made of a material that melts with heat at the time of fire to open the confirmation hole. The problem is solved by the closed structure of the concrete filling confirmation hole.
[0006]
In this structure, even if the plug is not removed after the concrete is hardened, the plug melts with the heat of the fire and opens the confirmation hole. Therefore, the work of removing the plug material after the hardening of the filled concrete can be eliminated, and the work load can be reduced.
[0007]
In addition, the plug material that fills the concrete filling confirmation hole provided in the CFT steel pipe is deteriorated and / or decomposed by alkali in the filled concrete and has a property of opening the confirmation hole. It is also solved by the closed structure of the sex confirmation hole.
[0008]
In this structure, even if the plug is not removed after the concrete has hardened, the plug will be degraded and / or decomposed by the alkali in the concrete over time and open the confirmation hole, so the plug will be filled in the event of a fire. Steam from the concrete can escape to the outside of the steel pipe through the confirmation hole, so that the work of removing the plug material after the hardening of the filled concrete can be eliminated, and the work load can be reduced.
[0009]
Further, the above problem is that the plug material closing the concrete filling confirmation hole provided in the CFT steel pipe is made of a material that is decomposed by the biodegradation of microorganisms and opens the confirmation hole. The solution is also solved by the characteristic closed structure of the CFT concrete filling hole.
[0010]
In this structure, even if the plug material is not removed after the concrete has hardened, the plug material will be decomposed by the biodegradation of microorganisms over time, and the confirmation hole will be opened. The steam can escape to the outside of the steel pipe through the confirmation hole. Therefore, the work of removing the plug material after the hardening of the filled concrete can be eliminated, and the work load can be reduced.
[0011]
Further, the above problem is that the plug material closing the concrete filling confirmation hole provided in the CFT steel pipe has a property of opening the confirmation hole without removing it. The problem is solved by the closed structure of the concrete filling confirmation hole. In other words, starting from deterioration and / or decomposition by alkali, decomposition by biodegradation of microorganisms, opening of confirmation holes by deformation due to heat at the time of fire due to the use of shape memory resin as a plug material, opening of confirmation holes by deformation falling off, etc. The point is that the plug material has the property of opening the confirmation hole without removing it.
[0012]
With this structure, even if the plug material does not need to be removed after the concrete has hardened, the plug material opens the confirmation hole, so that in the event of a fire, the steam from the concrete can escape to the outside of the steel pipe through the confirmation hole, Therefore, the work of removing the plug material after the hardening of the filled concrete can be eliminated, and the work load can be reduced.
[0013]
Also, the above problem is that an elastic base material having a concrete filling confirmation hole is fitted into a concrete filling confirmation hole provided in a CFT steel pipe, and a plug material uses the elasticity of the base material. Then, by being fitted into the confirmation hole, the concrete filling confirmation hole of the CFT steel pipe is closed, and
The problem is solved by the closed structure of the CFT concrete filling confirmation hole, characterized in that the base material and / or the plug material is made of a material that melts by heat at the time of fire and opens the confirmation hole of the steel pipe. It should be noted that this closing structure should be recognized as a subordinate concept of the closing structure of claim 1, and the plug material according to claim 1 and the plug material in the present structure have only different meanings. It belongs to the range.
[0014]
In this structure, even if the plug is not removed after the concrete has hardened, the base material and / or plug can be melted by the heat of the fire and the confirmation holes are opened. Can be released to the outside of the steel pipe through the confirmation hole of the steel pipe, so that the work of removing the plug material and the base material after the hardening of the filled concrete can be eliminated, and the work load can be reduced.
[0015]
Moreover, in this structure, the base material is fitted in the confirmation hole of the steel pipe before filling concrete, the filling property of concrete is confirmed with the confirmation hole of the base material, and after confirmation, the confirmation hole of the base material is closed with a plug material. And so on. Therefore, the base material can be easily fitted into the confirmation hole of the steel pipe without being disturbed by the filled concrete, and can be easily performed by utilizing the elasticity of the base material. In addition, the plug can be easily attached only by fitting it into the confirmation hole by utilizing the elasticity of the base material after confirming the filling property.
[0016]
In addition, the base material and / or the plug material may be made of a material that is decomposed by alkali in concrete to open a confirmation hole of a steel pipe, or made of a material that is decomposed by biodegradation by microorganisms. Alternatively, it may be made of any other property that opens the confirmation hole without removing it. The closing structure in this case should be recognized as a lower concept of the closing structure according to claims 2, 3, and 4, and belongs to the technical scope thereof.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the present invention will be described with reference to the drawings.
[0018]
In the closed structure of the first embodiment shown in FIGS. 1 and 2, 1 is a CFT column, 2 is a steel pipe, 3 is filled concrete, 4 is a confirmation hole, and 5 is a plug.
[0019]
As shown in FIG. 2A, after confirming the filling property of the concrete 3, the steel pipe 2 with the confirmation hole 4 was installed on the site, and then the concrete 3 was placed in the steel pipe 2 as shown in FIG. 3 and filled through the confirmation hole 4. Thereafter, as shown in FIG. 2 (c), the confirmation hole 4 is closed with a plug material 5 to prevent the concrete 3 from flowing out, and as shown in FIG. 2 (d), the filled concrete 3 is hardened.
[0020]
The plug member 5 is made of a resilient shaped material. As shown in FIGS. 1 (b) and (c), one end of the base 6 having a smaller cross-sectional size than the confirmation hole 4 A collar-shaped retaining portion 7 that protrudes laterally larger than the size is provided, and a fin 8 that protrudes laterally larger than the size of the confirmation hole 4 is provided on the outer periphery of the base 6.
[0021]
When the plug material 5 is fitted into the confirmation hole 4 from the outside of the steel pipe 2 by utilizing its elasticity, the retaining portion 7 is located on the inner surface side of the steel pipe, and the plug material 5 is formed by the uncured filled concrete 3. 2 is prevented from falling outside, and the confirmation hole 4 is firmly closed by receiving the pressure from the filled concrete 3. Further, the fin 8 allows the plug member 5 to be easily inserted into the confirmation hole 4, a stable insertion state without wobble can be obtained, and the outflow of the filled concrete is secondary. Can be prevented.
[0022]
The plug material 5 has a property of melting by heat at the time of fire and opening the confirmation hole 4, and as shown in FIG. 2 (e), when a fire 10 occurs, the heat melts the plug 5 so that the confirmation hole 4 is opened. The steam 11 from the filled concrete 3 can escape to the outside of the steel pipe 2. Therefore, the work of removing the plug material 5 after the hardening of the filled concrete 3 can be eliminated, the work load can be reduced, and the work safety can be enhanced. In addition, as the plug material 5 having such properties, for example, those made of a vinyl chloride resin, a vinyl acetate resin, chloroprene rubber, urethane rubber, and the like can be mentioned, but it is not limited to such.
[0023]
Further, the plug member 5 may be made of a material that is deteriorated and / or decomposed by the alkali in the concrete 3 to open the confirmation hole 4. In this case, even after the hardened concrete 3 is hardened, the plug 5 is decomposed by the alkali in the hardened concrete 3 over time even if the plug 5 is left attached to the confirmation hole 4 without being removed. Then, the confirmation hole 4 is opened. Therefore, in the event of a fire, steam from the filled concrete 3 can escape to the outside of the steel pipe 2, so that the work of removing the plug 5 after the hardening of the filled concrete 3 can be eliminated, and the work load can be reduced. Further, it is possible to improve the safety of the operation when the confirmation hole 4 exists at a high place. In addition, as the plug material 5 having such properties, for example, a plug made of an alkyd resin or an alkali-decomposed resin may be used.
[0024]
Further, the plug member 5 may be made of a material that is decomposed by a biodegradation effect of the action of a microorganism to open a confirmation hole. In this case, even after the filling concrete 3 has hardened, the plug 5 is decomposed by the action of microorganisms due to the action of microorganisms even if the plug 5 is left attached to the confirmation hole 4 without being removed. Then, the confirmation hole 4 is opened. By opening the confirmation hole 4 in this way, the steam from the concrete filling 3 can escape to the outside of the steel pipe 2 in the event of a fire, so that the work of removing the plug 5 after the concrete filling 3 has hardened can be eliminated. As a result, the work load can be reduced, and work safety can be improved. In addition, as the plug material 5 having such a property, for example, a material made of biodegradable plastic may be used, but the material is not limited to such.
[0025]
In the closing structure according to the second embodiment shown in FIGS. 3A and 3B, as the plug member 5, a brim-like protrusion that protrudes laterally at one end of the base 6 larger than the size of the confirmation hole 4. In addition to the retaining portion 7, the other end of the base 6 is provided with a rib-shaped drop-down regulating portion 9 that protrudes laterally larger than the size of the confirmation hole 4. Are formed to have a size equal to or slightly smaller than the sectional size of the confirmation hole 4.
[0026]
When the plug material 5 is fitted into the confirmation hole 4 from the outside of the steel pipe 2 by using its elasticity, the retaining portion 7 is located on the inner surface side of the steel tube, and the drop restricting portion 9 is located on the outer peripheral side of the steel tube. However, the plug material 5 is prevented from falling out of the steel pipe 2 by the uncured filled concrete 3, and the plug material 5 is prevented from being erroneously dropped into the steel pipe 2 at the time of fitting.
[0027]
As shown in FIGS. 3 (B-1) and (B-2), for the steel pipes 2 having different wall thicknesses, the confirmation holes 4 may be closed with plugs 5 prepared for the steel pipes. .
[0028]
As shown in FIG. 4, the closing structure of the third embodiment shown in FIGS. 4 and 5 is such that the elastic base material 13 having the concrete filling confirmation hole 14 is inserted into the concrete filling confirmation hole 4 of the steel pipe 2. The plug material 16 is fitted into the confirmation hole 14 by using the elasticity of the base material 13 so that the concrete filling confirmation hole 4 of the steel pipe 2 is closed.
[0029]
The base member 13 has a form in which a through hole for confirmation is provided in a shaft core portion of the base of the stopper used in the first embodiment, and the stopper 16 is partially inserted into the confirmation hole 14. There is provided a conical portion 16a for closing the confirmation hole 14 of the base material 13. The base member 13 has a property of melting by heat at the time of fire and opening the confirmation hole 4 of the steel pipe 2, and the plug member 16 may be of a material melting by heat at the time of fire. Although it may be made of a material having a property, in the present embodiment, it is made of a hard material having a property of not melting by heat at the time of fire.
[0030]
In this closed structure, as shown in FIG. 5 (a), after the base material 13 is fitted in the confirmation hole 4 of the steel pipe 2 in a factory or the like in advance, the steel pipe 2 is installed on the site and the filling property of the concrete 3 is increased. 5 is confirmed by the confirmation hole 14 of the base material 13 as shown in FIG. 5B, and after confirmation, the confirmation hole 14 of the base material 13 is closed with the plug 16 as shown in FIG. And so on. Thereby, the fitting of the base material 13 to the confirmation hole 4 of the steel pipe 2 can be easily performed without being disturbed by the filled concrete 3, and the elasticity of the base material 13 can be easily used. Can be. Also, the plug 16 can be easily attached by simply fitting it into the confirmation hole 14 by utilizing the elasticity of the base 13 after confirming the filling property.
[0031]
In this structure, even if the plug 16 is not removed after the hardened concrete 3 is hardened as shown in FIG. 5D, if a fire occurs, as shown in FIG. Since the material 13 is melted by the heat at the time of the fire, the plug material 16 falls off, and the confirmation hole 4 of the steel pipe 2 is opened, the steam 11 from the filled concrete 3 can escape to the outside of the steel pipe 2 at the time of fire, and The work of removing the plug material 16 and the base material 13 after the hardening of the filled concrete 3 can be eliminated, the work load can be reduced, and the work safety can be enhanced.
[0032]
Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various changes can be made without departing from the spirit of the invention. For example, in the above embodiment, a case where the present invention is applied to a CFT column is shown. However, the present invention can also be applied to a CFT used for a horizontal member such as a beam or an oblique member. Further, the form of the plug material and the base material can be variously changed, and is not limited to the illustrated form. Further, in the closing structure of the type of the first or second embodiment, the plug material may be made of a composite material of a material having elasticity and a material having no elasticity, and the form needs to be different. It may be made of a hard material having no elasticity.
[0033]
【The invention's effect】
Since the present invention is as described above, the work of removing the plug material after the hardening of the filled concrete can be eliminated, and the work load can be reduced.
[Brief description of the drawings]
1A and 1B show a confirmation hole closing structure according to a first embodiment, wherein FIG. 1A is a longitudinal sectional view of a CFT column, and FIG. 1B is a sectional view showing a state in which a plug is attached to the confirmation hole. (C) is a cross-sectional view showing a method of attaching the plug to the confirmation hole.
FIGS. 2 (a) to 2 (e) are cross-sectional views sequentially showing the state of installation of a steel pipe, filling of concrete, confirmation of filling properties, closing of a confirmation hole, hardening of filled concrete, and fire.
FIG. 3 relates to a second embodiment, in which FIG. (A-1) shows an attached state of a plug, FIG. (A-2) shows an attaching method thereof, and FIG. (B-2) is a cross-sectional view showing a method of attaching the plug material to the confirmation hole.
FIG. 4A is a cross-sectional view showing a confirmation hole closing structure according to a third embodiment, and FIGS. 4B and 4B sequentially show a mounting method of a base material and a plug material, respectively. FIG.
FIGS. 5 (a) to 5 (e) are cross-sectional views sequentially showing the state of installation of steel pipes, concrete filling, confirmation of filling properties, closing of confirmation holes, hardening of filled concrete, and fire.
[Explanation of symbols]
1: CFT pillar (CFT)
2 ... steel pipe 3 ... filled concrete 4 ... confirmation hole 5 ... plug material 13 ... base material 14 ... confirmation hole 16 ... plug material

Claims (5)

The concrete filling property check of CFT, characterized in that the plug material closing the hole for confirming concrete filling property provided in the CFT steel pipe is made of a material that melts by heat at the time of fire and opens the checking hole. Hole closure structure. Confirmation of concrete filling property of CFT, in which the plug material closing the hole for confirming concrete filling property provided in the steel pipe of CFT is characterized by being degraded and / or decomposed by alkali in the filled concrete to open the confirmation hole. Hole closure structure. The concrete filling of CFT, characterized in that the plug material closing the concrete filling confirmation hole provided in the CFT steel pipe is made of a material that is degraded by the biodegradation of microorganisms and opens the confirmation hole. Closed structure of sex confirmation hole. The plug material for closing the concrete filling confirmation hole provided in the CFT steel pipe is made of a material capable of opening the confirmation hole without removing the concrete filling confirmation hole. Closed structure. An elastic base material having a concrete filling confirmation hole is fitted into a concrete filling confirmation hole provided in a CFT steel pipe, and a plug material is fitted into the confirmation hole using the elasticity of the base material. As a result, the concrete filling confirmation hole of the CFT steel pipe is closed, and
A closed structure for a CFT concrete filling confirmation hole, characterized in that the base material and / or the plug material is made of a material that melts by heat at the time of fire to open the confirmation hole of the steel pipe.

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