JP2003239542A - Reuse method for structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reuse a used structure as the structure for a new building without dismantling it. <P>SOLUTION: This reuse method for the structure reuses the used structure (a building unit) comprising structural members (columns 11, floor beams 12, roof beams 13, and floor binding beams 14) composed of plated steel material as the structure for the new building (a unit building). The deterioration level of the structural members is nondestructively examined and the structural member is repaired according to the deterioration level. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of reusing a structure for a building structure, a civil engineering structure, a mechanical structure or the like.

[0002]

2. Description of the Related Art As the need for waste reduction and reuse increases socially, repair information proposed by Japanese Patent Laid-Open No. 7-318510, 2001-216375, etc. is proposed as a method of reusing building construction. There is a method of repairing a structure such as a roof, a wall, and a floor by using and reusing the structure as it is, or a method of disassembling the structure to a member level and reusing it as a reuse material. If the structure is composed of a structural member made of plated steel material, it is recovered as iron scraps at the stage of disassembling the structure, melted once, and then reused as recycled steel material.

[0003]

In the prior art, even a structure that can be reused without disassembling due to its quality requires steps such as disassembling, collecting, and regenerating, which is economically efficient in terms of energy consumption and the like. Not reasonable.

An object of the present invention is to make it possible to reuse a used structure as a structure for a new structure without disassembling it.

[0005]

The invention according to claim 1 is a method of reusing a structure, wherein a used structure composed of a structural member made of plated steel is reused as a structure for a new structure. Therefore, the deterioration level of the structural member is nondestructively inspected, and the structural member is repaired according to the deterioration level.

According to a second aspect of the present invention, in addition to the first aspect of the invention, the deterioration level is inspected by a combination of a residual plating adhesion amount control using a film thickness meter and an appearance inspection. Is.

According to a third aspect of the present invention, in addition to the second aspect of the present invention, the residual plating adhesion amount using the film thickness meter is calculated by multiplying the film thickness measured by the film thickness meter by a safety factor. It is a thing.

According to a fourth aspect of the present invention, in addition to the second or third aspect of the invention, the repair according to the deterioration level is such that the residual plating adhesion amount calculated based on the film thickness measured by the film thickness meter is the structural member. If it is above the threshold value at all measurement points, the rust occurrence part on the appearance is subjected to a skeleton treatment, and rust-preventive coating is applied to this skeleton-treated portion, and the amount of plating adhesion is below the threshold value even at some measurement points. In this case, the rust-occurring portion on the external appearance is subjected to a skeleton treatment, and rust-preventive coating is applied to the entire surface including the skeleton-treated portion.

A fifth aspect of the present invention is the invention according to any one of the first to fourth aspects, wherein the structure is a building unit.

[0010]

According to the invention of claim 1, the following effects are obtained. By nondestructively inspecting the deterioration level of the structural members that make up the used structure, and repairing the structural members according to the deterioration level, it is possible to construct a new structure without dismantling the used structure. Can be reused as a structure.

According to the invention of claim 2, the following effects are obtained. Since the residual coating weight of the structural member is controlled by using a film thickness meter, it is possible to inspect the deterioration level of the plating without destroying the structural member, as compared with the case where the coating weight test by the antimony chloride method is adopted.

Corrosion of the structural members causes white rust in the plating layer and red rust in the steel material, and the volume expands at this corroded portion,
Even when the measured value of the film thickness meter is larger than the actual thickness of the plated layer, it can be dealt with by performing a visual inspection to determine the presence or absence of rust and performing necessary rust prevention treatment.

According to the invention of claim 3, there is the following action. The measurement value obtained by the film thickness meter often has a coefficient of determination of about 0.6 to 0.8 with respect to the measurement result obtained by the antimony chloride method, which is not sufficient in terms of measurement accuracy. Therefore, by measuring the film thickness measured by the film thickness meter and multiplying it by the safety factor to calculate the remaining coating adhesion amount, the measurement error of the film thickness meter is eliminated and the quality control accuracy (level) of the plating adhesion amount is improved. Can be secured.

According to the invention of claim 4, there is the following action. If the residual plating usage calculated based on the film thickness measured by the film thickness meter is at or above the threshold value at all measurement points of the structural members, the rust occurrence area on the appearance is subjected to a cleaning process, and the cleaning process area is protected. Carry out rust painting. On the other hand, if the amount of coating adhesion is less than the threshold value even at a part of the measurement points, the rust-occurring portion on the appearance is subjected to a skeleton treatment, and rust-preventive coating is applied to the entire surface including the scavenged portion. As a result, appropriate repair can be performed according to the deterioration level of the structural member.

According to the invention of claim 5, there is the following action. The above items 1 to 3 can be realized in the building unit, and the building unit can be reused as a building unit for a new unit building without dismantling the used building unit.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION FIG. 1 is a perspective view showing a building unit, FIG. 2 is a table showing a plating amount measurement result of a film thickness meter and an antimony chloride method, and FIG. 3 is a plating amount measurement of a film thickness meter and an antimony chloride method. A diagram showing the result of the correlation analysis result, FIG. 4 is a plan view showing the definition of the designation of the measurement surface of the column and floor beam, FIG. 5 is a plan view showing the definition of the designation of the measurement surface of the column surface, and FIG. 6 is a girder. A plan view showing the definition of the names of the measurement surfaces of the beams and gables, FIG. 7 is a perspective view showing the measurement points and measurement positions of the column base, and FIG. 8 is a plan view showing the measurement points and measurement positions of the floor beam. FIG. 9 is a chart showing a measurement record table of columns and floor beams, FIG. 10 is a chart showing a measurement record table of columns, and FIG.
Is a chart showing a measurement record table of a floor beam, and FIG. 12 is a chart showing a measurement record table of a roof beam.

FIG. 1 shows a building unit 1 to which the present invention is applied.
The building unit 10 includes columns 11, floor beams 12 (floor girder beams 12A, floor girder beams 12B) joined to the column bases of each column 11 via joint pieces 11A, and each column. Roof material 13 (roof girder beam 13A, roof girder beam 13B) joined to the pillar head of 11 via a joint piece 11B.
It is a frame structure consisting of and. Then, the floor girders 14 are bridged across the floor girders 12A facing each other, the floor joists 15 are supported on the floor joists 14, and the floor covering is supported on the floor joists 15.
Further, the ceiling joists 16 are bridged across the roof girders 13A facing each other, and the ceiling surface material is supported under the ceiling joists 16. Pillar 11,
The floor beam 14 is made of square steel pipe, the floor beam 12 and the roof beam 13 are made of shaped steel, and a plated steel material plated with hot-dip galvanizing is used as the steel pipe and shaped steel.

The building unit 10 is manufactured in a factory and then transported to a building site, and a plurality of building units 10 are installed on a foundation installed on the building site to construct a unit building.

However, in this embodiment, the used building unit 10 used in the existing unit building is replaced by the pillar 1
The present invention relates to a method of reusing as a building unit 10 for a new unit building without disassembling up to the member level of 1, floor beam 12, roof beam 13 and floor beam 14.

In the present embodiment, the used building unit 10
Of the structural members such as the pillars 11, the floor beams 12, the roof beams 13, and the floor girders are nondestructively inspected, and the columns 11,
The floor beam 12, roof beam 13, and floor beam 14 are repaired according to the deterioration level. Specifically, by controlling the amount of residual plating adhesion using a film thickness meter and visual appearance inspection,
The deterioration level of the pillar 11, the floor beam 12, the roof beam 13, and the floor girder 14 is inspected. In addition, the above-mentioned residual plating adhesion amount is calculated by multiplying the measured film thickness of the film thickness meter by the safety factor.

That is, in the coating amount test of a normal hot-dip galvanized steel sheet such as JIS, the antimony chloride three-point method or the method of measuring the coating amount by fluorescent X-ray is adopted. In this method, it is necessary to cut and cut out the member or a large-scale measuring device is required. However, when reusing the used building unit 10, it is impossible to destroy the members,
The above method is not suitable because there are some measurements such as outdoors and complicated shaped members. Therefore, in the present embodiment, a film thickness meter is used as a method of setting the plating adhesion amount, and the plating adhesion amount is managed by the following formula (1).

A = b × t (1) where A: coating adhesion (g / m ² ) b: plating layer density (g / m ³ ) (in the case of hot dip galvanizing b = 7.2) t: Film thickness (μm)

However, when the plating amount is controlled by the film thickness meter, there are the following problems. (a) Corrosion of plated steel material means corrosion of plated steel (white rust) and corrosion of steel material (red rust). As the corrosion progresses, the volume expands in the corroded portion, and the thickness of the corroded portion may be larger than the actual thickness of the plated steel.

(B) FIGS. 2 and 3 show comparative examples of the measurement results of the coating thickness of the used galvanized steel material by the film thickness meter and the antimony chloride method. In this correlation analysis result, the coefficient of determination R ² =
It was 0.605. Correlation analysis between the film thickness meter and the antimony chloride method generally has a relationship with the surface roughness, and the coefficient of determination R
² (correlation coefficient R) is often about 0.6 to 0.8. Therefore, in quality control of the deterioration level of each member, there is a problem in accuracy of the film thickness measured by the film thickness meter.

In this embodiment, the following means are adopted in order to solve the problems (a) and (b) described above.

For (a), the white rust and red rust parts are judged not by the film thickness but by the appearance to determine whether or not rust is generated, and for the rusted part, it is appropriate under the condition that the plating adhesion amount is 0 g / m ^2. Implement anti-corrosion treatment. Proper rust prevention is, for example, rust prevention coating that is effective even on a plated surface such as two-component epoxy resin coating.

Regarding (b), what is important in quality control of the coating amount is to grasp the portion where the coating amount is the most reduced. The plating corrosion amount A is calculated by multiplying c by the following formula (2). A = b × t × c (2)

Here, c: type of plated steel sheet (hot dip galvanizing, hot dip-5% aluminum alloy plating, etc.)
Is a coefficient determined by. In this embodiment, the safety factor C = 0.
Adopted 8 to 0.95.

According to the above formula (2), it is possible to eliminate the setting error in the film thickness meter and to secure an appropriate quality level as the plated steel material.

However, the procedure for reusing the building unit 10 is as follows. (1) The names of the measurement surfaces of the structural members of the building unit 10 are defined as follows.

(1-1) As for the pillar 11, as shown in FIG. 4, the pillar at the upper left of the plan view is set to 1 in units of 1 unit, and is set to 2.3.4 in the clockwise direction.

(1-2) As for the floor girders 14, as shown in FIG.

(1-3) As for the pillar surface of the pillar 11, as shown in FIG. 5, the inside of the girder is a, the outside of the girder is two, the outside of the girder is b,
The inside of the wife's room is designated as Ha.

(1-4) As for the floor girder beam 12A and the roof girder beam 13A, as shown in FIG. 6, the upper beam in the plan view is A and the lower part is B in units of one unit.

(1-5) Regarding the gable girder 12B and the gable girder 13B, the beam on the left side of the plan view is D and the right side is E on a unit basis as shown in FIG.

(2) The measurement points and measurement positions of each structural member of the building unit 10 are specified as follows.

(2-1) As for the column base of the column 11, as shown in FIG. 7, the measurement point (measurement surface) is the column 2 surface (a and d or a and c), and the measurement position is 1) column. 75mm from the lower end, 2) 500mm from the lower end of the column, 3) 1000mm from the lower end of the column, 4) Lower flange of joint girder side joint piece, 5) Lower flange of joint girder side joint piece, 6) 75mm from the upper end of the column.

(2-2) As for the floor beam 14, as shown in FIG. 8, the measurement points are two points on both ends of the unit center floor beam, and the measurement point is 100 mm from the lower end of the beam.

(2-3) For the floor girder beam 12A and the roof girder beam 13A, the measurement points are a, b, and c from the left in the plan view (FIG. 6).

The measurement surface of the floor girder beam 12A is the outside or inside of the web surface and the outside of the lower flange surface, and the measurement positions are 1) 100 mm left from the joint piece, 2) the center of the beam, and 3) 100 mm right from the joint piece. To do.

The measurement surface of the roof girder beam 13A is the inside of the web surface and the outside or inside of the upper flange surface, and the measurement positions are 1) 100 mm left from the joint piece, 2) the center of the beam, and 3) 100 mm right from the joint piece. To do.

(2-4) For the gable girder 12B and the gable girder 13B, the measurement points are designated as d, e, f from the top in the plan view (FIG. 6).

The measurement surface of the floor girder 12B is set to the outside or inside of the web surface and the outside of the lower flange surface, and the measurement position is 1).
100mm left from the joint piece, 2) center of the beam, 3) 100mm right from the joint piece.

Further, the roof girder beam 13B has a measurement surface inside the web surface and outside or inside the upper flange surface, and the measurement positions are 1) 100 mm left from the joint piece, 2) the center of the beam, and 3) 100 mm right from the joint piece. To do.

(3) The plating film thickness is measured using a film thickness meter at the measurement location and measurement position of (2) defined for each structural member of the building unit 10, and the measurement results are shown in FIG.
It records in the recording table of FIG. 9 is a record table for pillars 1, 2 and floor beams, FIG. 10 is a record table for pillars 3 and 4, FIG. 11 is a record table for floor beams, and FIG. 12 is a record table for roof beams. is there.

(4) For each structural member of the building unit 10, the measurement result of the film thickness meter obtained in (3) above, the deterioration level inspection of those members based on the appearance inspection result, and the repair according to the deterioration level Is carried out as follows.

(4-1) Regarding the pillar base of the pillar 11 in the building unit 10 constituting the first floor of the unit building (the pillar 11 and the joint piece 11A within 1 m from the lower end of the unit)

(A) Control of the amount of residual plating adhered by the film thickness meter The amount of residual plating adhered calculated by the above formula (2) based on the film thickness measured by the film thickness meter is 120 g / m ² ( For parts with a threshold value or more, the following (B) is applied, and for parts of the measurement points where the value is less than 120 g / m ^{2, the following} (B) is applied.

(B) Visual inspection and visual inspection of the condition of the surface of the repair member to check if red rust, white rust or the like has occurred on the steel surface.

1. If red rust, white rust, etc. occur, clean the surface with a squeegee to remove the rust. 2. Remove dust, oil, etc. from the portion where the shavings are processed. 3. Perform rust-preventive coating in accordance with the coating specifications for the above-mentioned keren treatment part.

By visually observing the condition of the member surface, it is confirmed whether red rust, white rust or the like has occurred on the surface of the steel material.

1. If red rust, white rust, etc. occur, clean the surface with a squeegee to remove the rust. 2. Remove dust, oil, etc. from the portion where the shavings are processed.

3. Perform rust prevention coating on the entire surface within 1m from the lower end of the unit, including the above-mentioned portion treated with shaving, according to the coating specifications.

(4-2) Structural members other than the column bases of the columns 11 of the building unit 10 constituting the first floor portion of the unit building (columns 11, floor beams 12, roof beams 13, floor beams 14) and Two
Structural member of building unit 10 (column 1)
1, floor beam 12, roof beam 13, floor beam 14)

(A) Controlling the amount of residual plating adhered by the film thickness meter The amount of residual plating adhered calculated by the above formula (2) based on the film thickness measured by the film thickness meter is 60 g / m ² (threshold (B) or more are applied to the members having the above values), and (B) or to the following is applied to some of the measurement points having a value of less than 60 g / m ² .

(B) Visual inspection and visual inspection of the condition of the surface of the repair member to check whether red rust, white rust or the like has occurred on the steel surface.

1. If red rust, white rust, etc. occur, clean the surface with a squeegee to remove the rust. 2. Remove dust, oil, etc. from the portion where the shavings are processed. 3. Perform rust-preventive coating in accordance with the coating specifications for the above-mentioned keren treatment part.

On the measurement surface of the steel material member, if the number of remaining plating deposits of less than 60 g / m ^{2 is} less than a certain number, the surface of the steel material is visually inspected and no red rust, white rust or the like has occurred Check if

1. If red rust, white rust, etc. occur, clean the surface with a squeegee to remove the rust. 2. Remove dust, oil, etc. from the portion where the shavings are processed. 3. Perform rust-preventive coating on the entire surface including the above-mentioned keren-treated part in accordance with the coating specifications.

If there are a large number of remaining plating deposits of less than 60 g / m ² over a certain number on the measurement surface of the structural member, the building unit 10 is discarded as non-reusable and discarded.

Therefore, according to this embodiment, there are the following effects. Structural members that make up the used building unit 10 (column 1
1, non-destructive inspection of the deterioration level of the floor beam 12, roof beam 13, floor girder 14), the structural member (column 11, floor beam 12,
By repairing the roof beam 13 and the floor beam 14) according to the deterioration level, the used building unit 10 can be reused as a building unit 10 for a new unit building without dismantling.

Structural members (column 11, floor beam 12, roof beam 1)
3. The amount of remaining plating on the floor beam 16) is controlled by using a film thickness meter, so compared to the adoption of the plating amount test by the antimony chloride method, etc., the structural members (column 11, floor beam 12, roof) The deterioration level of the plating can be inspected without destroying the beam 13 and the floor beam 14.

Structural members (column 11, floor beam 12, roof beam 1)
3. Corrosion of the floor beam 14) causes white rust on the plating layer and red rust on the steel material, and the volume expands at this corroded part, and the measured value of the film thickness meter becomes larger than the actual thickness of the plating layer Also,
This can be dealt with by carrying out a visual inspection to determine the presence or absence of rust, and by carrying out the necessary rust prevention treatment.

The value measured by the film thickness meter often has a coefficient of determination of about 0.6 to 0.8 with respect to the result of measurement by the antimony chloride method, which is not sufficient in terms of measurement accuracy. For this reason, by measuring the film thickness measured by the film thickness meter and multiplying the safety factor to calculate the remaining amount of deposited plating, the measurement error of the film thickness meter can be eliminated and the quality control accuracy of the amount of deposited plating can be secured.

The residual plating usage amount calculated based on the film thickness measured by the film thickness meter is equal to or more than the threshold value at all measurement points of the structural members (column 11, floor beam 12, roof beam 13, floor beam 14). If so, the rust-occurring portion on the appearance is subjected to a skeleton treatment, and rust-preventive coating is applied to this skeletal treatment portion. On the other hand, if the amount of coating adhesion is less than the threshold value even at a part of the measurement points, the rust-occurring portion on the appearance is subjected to a skeleton treatment, and rust-preventive coating is applied to the entire surface including the scavenged portion. As a result, appropriate repair can be performed according to the deterioration level of the structural members (column 11, floor beam 12, roof beam 13, floor girder 14).

The above-mentioned items (1) to (5) are realized in the building unit 10, and the used building unit 10 is not disassembled,
It can be reused as a building unit 10 for a new unit building.

Although the embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration of the present invention is not limited to this embodiment, and the design can be changed without departing from the gist of the present invention. Etc. are included in the present invention.

[0068]

As described above, according to the present invention, a used structure can be reused as a structure for a new construct without disassembling.

[Brief description of drawings]

FIG. 1 is a perspective view showing a building unit.

FIG. 2 is a chart showing the results of plating amount measurement by a film thickness meter and an antimony chloride method.

FIG. 3 is a diagram showing a correlation analysis result of a plating amount measurement result of a film thickness meter and an antimony chloride method.

FIG. 4 is a plan view showing the definition of names of measurement surfaces of columns and floor beams.

FIG. 5 is a plan view showing the definition of the name of the measurement surface of the column surface.

FIG. 6 is a plan view showing the definition of names of measurement surfaces of a girder beam and a gable beam.

FIG. 7 is a perspective view showing measurement points and measurement positions of a column base.

FIG. 8 is a plan view showing measurement points and measurement positions of a floor beam.

FIG. 9 is a table showing a measurement record table of columns and floor beams.

FIG. 10 is a chart showing a column measurement record table.

FIG. 11 is a diagram showing a floor beam measurement record table.

FIG. 12 is a table showing a measurement record table of a roof beam.

[Explanation of symbols]

10 building units (structure) 11 pillars (structural members) 12 Floor beams (structural members) 13 Roof beams (structural members) 14 Floor beam (structural member)

Claims (5)

[Claims] 1. A method for reusing a structure, comprising reusing a used structure composed of a plated steel structural member as a structure for a new structure, wherein the deterioration level of the structural member is not destroyed. A method of reusing a structural body that is inspected in step 1 and repairs the structural member according to the deterioration level. 2. The method for reusing a structure according to claim 1, wherein the inspection of the deterioration level is performed by a combination of management of the amount of remaining plating deposition using a film thickness meter and visual inspection. 3. The method for reusing a structure according to claim 2, wherein the amount of residual plating adhered using the film thickness meter is calculated by multiplying the film thickness measured by the film thickness meter by a safety factor. 4. If the repair according to the deterioration level is such that the amount of remaining plating adhesion calculated based on the film thickness measured by a film thickness meter is equal to or greater than a threshold value at all measurement points of the structural member, the appearance is improved. The rust-generating portion is subjected to a keeling treatment, the anti-corrosion coating is applied to the keren-treated portion, and if the amount of plating adhered is less than the threshold value even at a part of the measurement points, the rust-generating portion on the appearance is subjected to a keeling treatment, The method for reusing a structure according to claim 2 or 3, wherein rust-preventive coating is performed on the entire surface including the kelen treatment part. 5. The method for reusing a structure according to claim 1, wherein the structure is a building unit.