JP7007722B2 - Vehicles for maintenance methods of steel structures and covering sheet sets - Google Patents

Description

The present invention relates to a vehicle equipped with a blasting means used in a maintenance method for a steel structure, and a covering sheet set for covering the blasting means.

Conventionally, steel structures such as steel bridges have been regularly repainted (maintenance method) for the purpose of preventing the generation of rust and the like and for the purpose of repainting paint that has been discolored due to aging. In order to repaint, it is necessary to remove old paint, rust, etc. In recent years, it has been removed by blasting (type 1 keren), and then new paint is applied.

For example, in Patent Document 1, after the cleaning material and dust after cleaning are collected in a recovery tank, the cleaning material and dust are separated and classified in the recovery tank to collect the dust and the like. On the other hand, a structure surface cleaning system that reuses the separated cleaning material is disclosed.

Japanese Unexamined Patent Publication No. 11-207624

By the way, for example, when it is attempted to perform preventive maintenance on a plurality of steel bridges crossing over an expressway, it is necessary to install blasting devices at each of the plurality of steel bridges near the site. For this reason, there are problems that it is difficult to secure a place to install the blasting device and that it takes time and effort to relocate the blasting device. Further, there is a similar problem in a steel structure such as a fence provided along a highway.

Therefore, an object of the present invention is to provide a vehicle for a maintenance method of a steel structure, which can save the trouble of relocating a blasting device.

The present invention also provides a covering sheet set capable of covering a blasting means loaded on a vehicle for a maintenance method of a steel structure to obtain a soundproofing effect and preventing harmful substances from scattering to the outside. The purpose is to do.

The present invention is a vehicle with a loading platform used in a maintenance method for a steel structure, which includes a blasting means for peeling the coating film of the steel structure, and recovers the peeled coating film and contains the peeled coating film in the coating film. A specific hazardous substance circulation unit for circulating the specific hazardous substance and a control unit for controlling the specific hazardous substance circulation unit are provided. It is divided into a closed area in which a toxic substance circulation part is arranged, and the loading platform covers an all-around covering part that covers the entire circumference of the closed area and at least a side peripheral part of the open area. A covering sheet structure having a soundproofing function and a specific hazardous substance scattering prevention function, and a support column for supporting the covering sheet, which constitutes a partially covered portion whose upper part is open to the outside, is provided. It is a vehicle for the maintenance method of steel structures, which is characterized by being made.

In such a configuration, since the entire circumference of the specified hazardous substance circulation portion including the blasting means is covered with the covering sheet, the hazardous substance does not scatter to the outside. Further, since the side peripheral portion of the entire peripheral covering portion and the partial covering portion is covered, it is possible to prevent tools and the like from falling from the vehicle. Further, the exhaust / exhaust heat of the control unit can be appropriately exhausted through the upper opening in the partial covering portion. A soundproofing effect can also be obtained by the covering sheet structure. Further, the blasting means can be easily transferred, and the blasting means and the like can be quickly moved to the next work site and the work can be started immediately while the blasting means and the like are mounted.

Further, it is proposed that the control unit includes a power supply control unit that supplies electricity to the specific hazardous substance circulation unit and an air control unit that controls the flow of air in the specific hazardous substance circulation unit.

Further, the present invention is a covering sheet set including the covering sheet and the support column used for the covering sheet structure.

In such a configuration, the above-mentioned effects can be obtained, and the covering sheet structure can be easily applied to a vehicle that does not have the covering sheet structure.

The vehicle for the maintenance method of the steel structure of the present invention has an effect of preventing harmful substances from scattering to the outside, a soundproofing effect, an effect of preventing tools and the like from falling, an effect of appropriately exhausting and exhausting heat, and a blasting means. The effect of facilitating transfer can be obtained.

Further, in addition to the above-mentioned effects, the covering sheet set of the present invention has an effect that the covering sheet can be easily attached to a vehicle having no covering sheet structure.

It is a flow chart which shows the procedure of the maintenance method of a steel bridge. It is a schematic explanatory drawing explaining the maintenance apparatus. A vehicle for a maintenance method of a steel structure is shown, (a) is a right side view, and (b) is a plan view. It is explanatory drawing which shows the mode of performing maintenance using the vehicle for maintenance method of a steel structure.

Hereinafter, examples in which the vehicle for the maintenance method and the covering sheet structure of the steel structure according to the present invention are embodied will be described in detail. The present invention is not limited to the examples shown below, and the design can be changed as appropriate.

Figure 1 shows an example of the maintenance procedure for an existing steel bridge.

First, for steel bridges to be maintained, temporary curing equipment such as scaffolding that meets the requirements for type 1 keren in painting work and dustproof sheets that prevent dust from leaking to the outside will be temporarily installed. In addition, advance preparation (S101) for installing an apparatus for performing blast processing is performed.

After that, the type and thickness of the old paint applied to the steel bridge, the condition of the steel bridge, and the like are investigated (S102). Then, based on the survey results, the type of grit and shot to be used, the injection speed, and the like are determined. Here, the grit (non-spherical) and the shot (spherical) to be selected are both specified in JIS Z 0310: 2004.

Then, blasting is first performed using the grit determined in S102 (S103). Specifically, in the temporary curing facility, the worker peels off the coating film or the like to be peeled off in the steel bridge and adjusts the substrate of the portion to be adjusted. The coating film, rust, etc. peeled off by the blast treatment and used grit are generated as dust, but since the dustproof sheet is attached in S101, the dust does not leak to the outside, and the dust does not leak to the outside. Accumulates on the work site.

Subsequently, the shot determined by S102 is loaded in place of the grit into the injection device that injects the grit, and the shot is replaced so that the shot can be injected. Here, the temporary scaffolding and the temporary curing equipment for the dustproof sheet will continue to be used without being removed.

Then, innumerable shots (projecting materials) are struck at a predetermined speed on the blasted portion (that is, the substrate adjusting portion) made of the bare ground formed by the blasting treatment by using the injection device replaced with the shot. (S104). By such shot peening treatment, the fatigue strength and stress corrosion cracking resistance of the bare ground are improved. The used shots generated by the shot peening process are deposited as dust on the work site as they are while being mixed with the used grit in S103. By the way, the shot peening treatment may be performed on all the bare ground on which the blast treatment has been performed, or may be performed partially on the periphery of the welded portion or the portion where the strength is uncertain.

The shot is composed of spherical particles, and it is desirable that the diameter D thereof is 50 μm ≦ D ≦ 2 mm. If the diameter D is less than 50 μm, sufficient compressive residual stress cannot be applied to the steel bridge. On the other hand, if the diameter D exceeds 2 mm, the amount of plastic deformation on the surface of the steel bridge becomes excessive, and the improvement of resistance to fatigue, stress corrosion cracking, and the like becomes insufficient.

After that, the bare ground on which the blast treatment and the shot peening treatment have been performed is confirmed (S105). Such confirmation includes not only visual confirmation but also comparison with, for example, ISO8501 blast photo book, roughness confirmation with a surface roughness measuring instrument, and the like. As a result, it is confirmed whether or not the unpeeled coating film remains or whether the roughness of the bare ground is within the standard, and accurate treatment is performed for the insufficient portion. For example, the base material is adjusted by using a hand tool or the like in a part where the blasting process cannot be performed.

The final finish coating for forming the final coating film is performed on the portion where the bare ground has been confirmed (S106). It should be noted that such coating is generally applied in multiple layers, such as an undercoat coating as an anticorrosive coating, an intermediate coating that protects the anticorrosive coating, and a topcoat coating that is the final finish coating. ..

When the painting is completed, the confirmation (S107) is performed. Such confirmation includes not only confirmation of the film thickness after the coating has dried, but also confirmation of the wet film thickness using, for example, a wetness gauge during the coating operation. Further, such confirmation is performed not only after the top coat coating, which is the final finish coating, but also during the undercoat coating and the intermediate coating.

When the painting work is completed by the above confirmation, the site is cleaned up (S108). Specifically, preventive maintenance is completed by collecting scaffolding, dustproof sheets, etc., and withdrawing the blast-shot peening injection device.

Further, together with the above procedure, the dust recovery step is executed (S110). Specifically, the used grit generated in the blast treatment (S103), the used shot generated in the shot peening treatment (S104), and the dust containing exfoliated matter and rust generated in each step are separated. I will collect it while collecting it.

It is preferable that the used grit and the used shot used in this embodiment and collected are both iron (metal) abrasives specified in JIS Z 0310: 2004. If the grit and shot are iron abrasives, they can be reused without being crushed like Armandite garnet and steel slag even if they collide with a steel bridge during use. Among them, high carbon cast steel can be reused about 600 times, which is very economical and can significantly reduce the amount of waste by separating it from foreign matter including peeled coating film and others. can.

Hereinafter, as an example, a maintenance device 1 capable of injecting a grit and a shot with a common device, and capable of collecting and separating used grit, used shot, peeled coating film, and the like. explain.

As shown in FIG. 2, the maintenance device 1 includes a specific hazardous substance circulation unit 2 in which a coating film containing a specific hazardous substance circulates. Further, the specified hazardous substance circulation unit 2 includes a pressure feeding hose 4, and an injector 3 is connected to the tip of the pressure feeding hose 4.

Grit g and shots s are injected from the injector 3. Further, the specified hazardous substance circulation unit 2 is provided with a suction hose 5, and the tip of the suction hose 5 is arranged at the work site α. As a result, the dust X composed of the used grit g', the used shots', and the foreign matter D including the peeled coating film and rust generated at the work site α can be sucked through the suction hose 5. can. A dustproof sheet (not shown) is stretched at the work site α so that the dust X does not leak to the outside, and a blower, a dust collector, and the like are appropriately installed.

Further, as shown in FIG. 2, the specified hazardous substance circulation unit 2 of the maintenance device 1 includes a grit hopper tank 10 and a shot hopper tank 20 arranged adjacent to each other. More specifically, the grit hopper tank 10 has a function of storing grit g and used grit g'(hereinafter, a mixture thereof is referred to as grit G). Further, the shot hopper tank 20 has a function of storing shots s and used shots s'(hereinafter, a mixture thereof is referred to as shot S). Further, the grit hopper tank 10 is connected to a grit pressurizing tank 11 for pressure-feeding the grit G stored in the grit hopper tank 10 to the work site α. Similarly, the shot hopper tank 20 is connected to a shot pressurizing tank 21 for pressure-feeding the shot S stored in the shot hopper tank 20 to the work site α.

Further, a dry compressed air supply means 30 is connected to the grit pressure tank 11 and the shot pressure tank 21 via a dry compressed air pipe 31. The dry compressed air supply means 30 includes an air compressor and an air dryer for supplying dry compressed air, and constitutes an air control unit (control unit) according to the present invention. Further, the dry compressed air pipe 31 is provided with a switching valve 32 so that the dry compressed air can be selectively supplied to the grit pressure tank 11 or the shot pressure tank 21, and the shot is replaced with the grit. Is freely loadable so that it can be injected.

Further, the pressure feeding hose 4 is connected to the grit pressure tank 11 and the shot pressure tank 21. With such a configuration, the grit G or shot S is injected from the injector 3 via the pumping hose 4 by the air pressure of the dry compressed air supplied from the dry compressed air supply means 30, and the steel bridge K to be worked is used. Blast processing or shot peening processing can be executed.

Further, the specified hazardous substance circulation unit 2 and the dry compressed air supply means 30 are supplied with electricity as a drive source from the generator 70 as the power supply control unit (control unit).

Next, the flow of the peeling coating film in the specified hazardous substance circulation section 2 will be described.

The dust X containing the used grit g', the used shots s', and the foreign matter D such as the peeled coating film deposited on the work site α is collectively sucked from one end of the suction hose 5. Then, the dust X sucked by the suction hose 5 reaches the inside of the sorting chamber 40 arranged above the grit hopper tank 10 and the shot hopper tank 20.

Further, a dust hose 51 is attached to the sorting chamber 40, and a dust collecting unit 50 as a peeling coating film collecting unit is connected to the dust hose 51. Further, an air suction device 60 as a dust suction means is connected to the dust recovery unit 50. Therefore, the dust X can be sucked by the air suction force of the air suction device 60.

A known technique can be suitably applied to the configuration of the sorting chamber 40 for separating the dust X into the used grit g', the used shot s', and the foreign matter D such as the peeled coating film.

The discharged foreign matter D is introduced into the dust recovery unit 50 via the dust hose 51, accumulated in the dust recovery unit 50, discharged to the waste bag 52 at a desired timing, and treated as industrial waste. ..

The blasting function of the maintenance device 1 constitutes the blasting means according to the present invention.

Next, the vehicle 80 for the maintenance method of the steel structure will be described with reference to FIG.

The vehicle 80 for the maintenance method of the steel structure is mainly a truck equipped with a loading platform 81, and as shown in FIGS. 3A and 3B, the loading platform 81 has the above-mentioned specified hazardous substance circulation unit 2 , A dry compressed air supply means 30, and a generator 70 are mounted.

More specifically, the loading platform 81 is divided into an open area 82 on the front side and a closed area 83 on the rear side, and is divided into two sections. A dry compressed air supply means 30 and a generator 70 are arranged in the open region 82. On the other hand, the specified hazardous substance circulation unit 2 is arranged in the closed region 83.

Further, a plurality of columns 91 are erected on the loading platform 81, and a horizontal member 92 is laid on the upper end of the columns 91 so as to connect the columns 91 to each other. Then, the covering sheet 93 is stretched over the support column 91 and the horizontal member 92, and an internal space is secured on the loading platform 81. As the covering sheet 93, a sheet having at least a soundproofing function and a function of preventing the scattering of specific harmful substances is adopted.

Here, in the open region 82, only the side peripheral portion is covered with the covering sheet 93 at a predetermined height, and the upper portion (ceiling portion) is opened upward to communicate with the outside to form the partial covering portion 96. There is.

On the other hand, the closed region 83 is covered with the covering sheet 93 on the entire circumference including the ceiling portion, and the all-around covering portion 95 having a closed internal space is configured. A through hole is provided in an airtight manner on the side surface of the all-around covering portion 95, and the pressure feeding hose 4 and the suction hose 5 are extended to the outside through the through hole.

In such a configuration, since the dry compressed air supply means 30 and the generator 70 are arranged in the partial covering portion 96, exhaust and exhaust heat are appropriately performed through the opening formed in the upper portion.

On the other hand, since the specified hazardous substance circulation section 2 is arranged in the covering portion 95 all around, the foreign substance D sucked by the suction hose 5 contains the specified hazardous substance such as lead, PCB, or asbestos. Even so, it does not scatter to the outside.

Further, since both the full circumference covering portion 95 and the partial covering portion 96 are covered with at least the side peripheral portion, there is an effect of preventing tools and the like from falling from the vehicle 80 for the maintenance method of the steel structure. be.

Further, in the vehicle 80 for the maintenance method of the steel structure, a soundproofing effect can be obtained by the covering sheet 93 as a sound countermeasure when the maintenance device 1 is operated.

Further, in the vehicle 80 for the maintenance method of the steel structure, since the maintenance device 1 is mounted on the loading platform 81, the maintenance device 1 can be easily transferred and quickly moved to the next work site. Moreover, work can be started immediately at the new site.

The covering sheet structure 90 is composed of the support column 91, the horizontal member 92, and the covering sheet 93 described above. Further, the covering sheet structure 90 constitutes the covering sheet set of the present invention. By using such a covering sheet set, the covering sheet structure 90 can be easily constructed even for a conventional general vehicle having no covering sheet structure.

Next, the usage mode of the vehicle 80 for the maintenance method of the steel structure will be described with reference to FIG.

In the steel structure maintenance method vehicle 80, for example, when performing preventive maintenance of a plurality of steel bridges (steel structures) 101 and 102 that cross the highway 100 continuously, the maintenance device 1 is used for each steel bridge 101, The highway 100 can be moved and continuously constructed while being mounted on the loading platform 81 without being laid on the ground for each 102. Further, as another usage mode (not shown), the expressway 100 is moved with the maintenance device 1 mounted on the loading platform 81 for a steel structure such as a fence constructed along the expressway 100. It can be constructed continuously.

In addition to the above configuration, the present invention can be appropriately redesigned. For example, the covering sheet 93 used in the covering sheet structure 90 can be appropriately selected for other characteristics as long as it has a soundproofing function and a specific harmful substance scattering prevention function. Further, the covering sheet 93 may be used in a plurality of layers. Further, in the open area 82, an apparatus (dust collection unit 50) for collecting detoxified waste may be appropriately arranged. Further, the all-around covering portion 95 may be provided with a closed doorway where an operator can enter and exit. Further, the covering sheet structure 90 may be a foldable skeleton structure.

1 Maintenance device 2 Specified hazardous substance circulation unit 3 Injector 4 Pressure feed hose 30 Dry compressed air supply means (air control unit)
70 Generator (power control unit)
80 Vehicle for maintenance method of steel structure 81 Loading platform 82 Open area 83 Blocked area 90 Covered sheet structure (covered sheet set)
91 Strut 92 Horizontal material 93 Covering sheet 95 All-around covering part 96 Partial covering part

Claims (3)

A vehicle with a loading platform used in the maintenance method for steel structures.
A specific hazardous substance circulation unit that includes a blasting means for peeling off the coating film of the steel structure, collects the peeled coating film, and circulates the specific hazardous substance contained in the coating film.
A control unit that controls the specified hazardous substance circulation unit and
Equipped with
The loading platform of the vehicle is
At least the open area where the control unit is located,
At least the closed area where the specified hazardous substance circulation part is located and
It is divided into
And, on the loading platform,
An all-around covering portion that covers the entire circumference of the closed region,
A partially covered portion that covers at least the side peripheral portion of the open region and is open to the outside above.
For the maintenance method of steel structures, which comprises a covering sheet having a soundproofing function and a specific harmful substance scattering prevention function, and a covering sheet structure provided with a support column for supporting the covering sheet. vehicle. The control unit
A power supply control unit that supplies electricity to the specified hazardous substance circulation unit,
An air control unit that controls the flow of air in the specified hazardous substance circulation unit,
The vehicle for the maintenance method of the steel structure according to claim 1. A covering sheet set comprising the covering sheet and the support column used in the covering sheet structure according to claim 1 or 2.

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