Blasting device for wall surface

Abstract

To provide a blasting device for a wall surface that requires less manpower for work.SOLUTION: A wall-surface blasting device for performing blast treatment on a steel portion of a wall surface of a steel bridge, comprises a body portion and a lifting portion that lifts the body portion and causes the body portion to face the steel portion. The body portion includes: a projection unit that projects an abrasive material for the blast treatment; a collection unit that collects the abrasive material projected by the projection unit; and a circulation unit that supplies the abrasive material, collected by the collection unit, to the projection unit. A closed projection space in which the abrasive material is projected toward the wall surface is defined by its being closed by the wall surface while the body portion is kept facing the steel portion. The abrasive material projected from the projection unit in the closed projection space is collected by the collection unit, and the abrasive material is supplied to the circulation unit. The abrasive material supplied to the circulation unit is supplied to the projection unit, and the abrasive material is projected again from the projection unit.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a wall blasting device for performing blasting on steel portions of wall surfaces of steel bridges. [Background technology]

[0002] Traditionally, existing steel bridges have undergone preventative maintenance to update paint that has corroded over time. Maintenance involves removing rust and old paint, so in recent years blasting (type 1 scraping) has been used to remove the rust and paint, and then a new coat of paint is applied.

[0003] In this blasting process, it is necessary to form scaffolding to cover the work space because abrasives, rust, old paint, etc. Generally, as disclosed in Patent Document 1, for example, a blasting device is installed at a predetermined position outside the scaffolding, and work is carried out by pulling a hose into the scaffolding.

[0004] In addition, there are known devices, such as the self-propelled blasting device disclosed in Patent Document 2, that perform blasting within a closed space within the main body, preventing abrasives and peeled old paint from scattering to the outside. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2019-214081 [Patent Document 2] Japanese Patent Application Laid-Open No. 2014-231052 Summary of the Invention [Problem to be solved by the invention]

[0006] Blasting requires a large number of personnel for pre-work preparation and post-work collection of abrasives and waste, and further improvements were required in the current labor shortage.

[0007] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a blasting device for walls that requires less manpower for operation. [Means for solving the problem]

[0008] The present invention is a wall blasting device that performs blasting on the steel portions of the wall surfaces of steel bridges, comprising: a main body; and a lifting portion that lifts the main body and places it against the steel portion; the main body comprises a projection portion that projects abrasive material for the blasting, a recovery portion that recovers the abrasive material projected by the projection portion, and a circulation portion that supplies the abrasive material recovered by the recovery portion to the projection portion; and when the main body is placed against the steel portion, a closed projection space is formed between the wall surface and the projection portion, in which the abrasive material is projected toward the wall surface; and within the closed projection space, the abrasive material projected from the projection portion is recovered in the recovery portion and supplied to the circulation portion, and the abrasive material supplied to the circulation portion is supplied to the projection portion and projected again from the projection portion. This is a wall blasting device characterized in that

[0009] This configuration allows for wall blasting, for example, in a self-propelled manner, and does not necessarily require skilled labor. By using, for example, suction technology to collect abrasives in the collection section, the closed projection space can be made negatively pressurized, forming an enclosed space. In this case, abrasives, rust, old paint, etc. are prevented from scattering to the outside, eliminating the need for protective measures such as sealing the entire blasting work space, freeing up workers to focus on other tasks. In particular, while blasting corners, splices, flanges, etc. requires separate work, this configuration allows these tasks to be performed in parallel while blasting the wall surface. Furthermore, workers performing blasting no longer need to wear heavy, face-covering air-supply masks, allowing them to perform the work with just a simple, electric fan-type mask.

[0010] Furthermore, a configuration is proposed in which the projection unit projects the abrasive material onto the wall surface by centrifugal force.

[0011] This configuration is particularly effective when the closed projection space is sealed by creating a negative pressure. Furthermore, compared to systems that use compressed air to project abrasives, for example, a compressor to supply compressed air is not required, contributing to the weight reduction of the entire device. Furthermore, the dust collector can also be minimized. Miniaturizing the device also significantly reduces power consumption, expanding the scope of work per base point and significantly reducing the amount of re-laying work on long-span bridges. For example, the number of personnel required for blasting flat surfaces can be reduced from approximately 10 people with conventional open blasting to just three people (operator, assistant, and re-laying worker). The freed-up personnel can then be allocated to curing areas other than flat surfaces, which is expected to significantly improve overall precision and shorten construction time. [Effects of the Invention]

[0012] The wall blasting device of the present invention has the excellent effect of requiring less manpower for the operation. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is an explanatory diagram of a steel road bridge according to an embodiment. [Figure 2] FIG. 1 is an explanatory diagram of a wall surface blasting device in operation according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, specific examples of the wall blasting device according to the present invention will be described in detail. Note that the present invention is not limited to the examples shown below, and appropriate design changes are possible.

[0015] As shown in Figure 1, a steel highway bridge is a steel bridge with a deck slab on top of which is formed a roadway for vehicles to travel on, with the foundation being steel members that form the bridge girders supported from below by piers. The maintenance method for such a steel highway bridge is to first form a suspended scaffolding that covers a specified portion of the steel members.

[0016] A drive unit for vertical movement is then placed on the low flange of the steel material to be blasted. A long pipe-shaped member extending in the same direction as the steel material is placed on the upper flange. The drive unit and long member form a lifting section. A lifting jig is placed on the lifting section, and the wall blasting device (a small circulating wall blasting robot) is suspended by a lifting wire. The device can be operated remotely using ICT, etc. This allows for accurate control of the construction speed and a uniform finished surface.

[0017] The self-propelled wall surface blasting device has a main body, as shown in Fig. 2. The main body has a projection unit that projects abrasives for blasting, a recovery unit that recovers the abrasives projected by the projection unit, and a circulation unit that supplies the abrasives recovered by the recovery unit to the projection unit.

[0018] Furthermore, when the main body is placed opposite the wall surface of the bridge girder, it is closed by the wall surface, forming a closed projection space in which the abrasive is projected toward the wall surface.

[0019] In the projection section, the abrasive is subjected to centrifugal force by an impeller having rotating blades and projected toward the closed projection space.

[0020] In the collection section, dust such as abrasives and coating debris is collected by sucking air from the closed projection space.

[0021] The circulation section separates the abrasives collected in the collection section from other debris, and supplies the abrasives to the projection section, while coating debris and other debris are sent via a hose to a dust collector outside the main body. The used abrasives supplied to the projection section are projected again from the projection section.

[0022] Such a self-propelled wall blasting device can, for example, blast a cleaning width of 200 mm and clean 30 m in a day. 2Furthermore, scaffolding installation, protective installation, and painting after blasting can be carried out at the same time. After cleaning the flat surfaces, a simple zinc-rich paint is applied to prevent rust from returning, which can significantly reduce the amount of work required during open blasting and shorten the overall blasting time.

Claims

1. A wall blasting device that performs blasting on steel parts of wall surfaces in steel bridges, a main body portion; and a lifting portion that lifts the main body portion and positions the main body portion against the steel portion, The main body portion is a projection unit that projects an abrasive material for the blasting treatment; a recovery unit that recovers the abrasive material projected by the projection unit; a circulation section that supplies the abrasive recovered by the recovery section to the projection section; Equipped with When the main body portion is placed opposite the steel portion, a closed projection space is formed between the wall surface and the projection portion, through which the abrasive is projected toward the wall surface, In the closed projection space, the abrasive projected from the projection section is collected in the collection section and supplied to the circulation section, and the abrasive supplied to the circulation section is supplied to the projection section and projected again from the projection section. A blasting device for walls characterized by:

2. The projection unit projects the abrasive material onto the wall surface by centrifugal force. The wall blasting device according to claim 1.

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