JP7470035B2 - Ceiling surface cleaning unit - Google Patents

Description

The present invention relates to a ceiling surface cleaning unit, and in particular to a ceiling surface cleaning unit capable of cleaning a ceiling surface using a dry cleaning machine.

For example, the Metropolitan Expressway and other roads have many box culvert-type road tunnels constructed as concrete structures, many of which have been in service for more than 30 years. For this reason, various repair works, including those to prevent concrete fragments from falling off, are being carried out on the ceiling surfaces of concrete structures such as old road tunnels.

On the other hand, when performing surface treatment work (base preparation work) as repair work on the wall surfaces of concrete structures, it is common to use a water jet abrasive cleaning device to abrade the surface of the concrete (see, for example, Patent Document 1 and Patent Document 2). However, these water jet surface abrasive cleaning devices generate a large amount of water, making it difficult to apply them to the ceiling surfaces of concrete structures. For this reason, ceiling abrasive cleaning devices and abrasive cleaning methods have been developed that use known dry abrasive cleaning devices to efficiently abrade the ceiling surfaces of box culvert-type road tunnels (see, for example, Patent Document 3 and Patent Document 4).

JP 2000-141354 A JP 2005-254156 A JP 2017-40103 A JP 2017-40104 A

However, in the ceiling surface abrasive cleaning devices and methods described in Patent Documents 3 and 4, the height of the guide support parts that guide the lifting frame as it rises and falls is limited, which restricts the height of the ceiling surface to which they can be applied. In addition, the outrigger parts must be used to adjust the platform of the transport vehicle so that it is level or nearly level, making them difficult to use in work sites where it is difficult to install outrigger parts.

The objective of the present invention is to provide a ceiling surface cleaning unit that can be installed on any support stand located below the ceiling surface to be cleaned, and that can efficiently clean the ceiling surface of a concrete structure using a dry cleaning device.

The present invention relates to a ceiling surface cleaning unit that includes a dry blasting machine and a movable rail section for moving the dry blasting machine, and that is installed on a support stand that is arranged below the ceiling surface to be cleaned, thereby enabling the ceiling surface to be blasted with the dry blasting machine. The unit comprises a base frame section having the movable rail section provided on its upper surface, lifting jacks interposed between the base frame section and the support stand and installed on all four sides of the base frame section, distance sensors arranged on all four sides of the base frame section for measuring the distance to the ceiling surface in a non-contact manner, and distance sensors arranged on both sides of the dry blasting machine for detecting contact with the ceiling surface. The above-mentioned object has been achieved by providing a ceiling surface cleaning unit which is configured to include at least two contact sensors for detecting the distance between the ceiling surface and the dry cleaning machine, and which controls the lifting and lowering of the lifting jack by operation by an operator via a control panel so that the distances to the ceiling surface measured by the at least three distance sensors are the same, thereby aligning the running surface of the movable rail section parallel to the ceiling surface, and then, while maintaining the running surface parallel to the ceiling surface, raising the contact sensor until it comes into contact with the ceiling surface, thereby setting the unit in a state in which the ceiling surface can be cleaned by the dry cleaning machine.

The ceiling surface cleaning unit of the present invention is preferably such that the base frame has a rectangular planar shape, the distance sensor is disposed at the four corners of the base frame, and the contact sensor is disposed at both ends of the long side of the base frame.

In addition, it is preferable that the ceiling surface cleaning unit of the present invention has an air cylinder in which the dry cleaning machine is capable of pressing the cutting disk of the cleaning machine body against the ceiling surface.

Furthermore, in the ceiling surface cleaning unit of the present invention, it is preferable that the moving rail portion is configured to include a left-right rail member and a front-rear rail member.

Furthermore, in the ceiling surface cleaning unit of the present invention, it is preferable that the support stand arranged below the ceiling surface to be cleaned is the work deck of an aerial work vehicle.

The ceiling surface cleaning unit of the present invention can be installed on any support stand located below the ceiling surface to be cleaned, allowing the ceiling surface of a concrete structure to be efficiently cleaned using a dry cleaning device.

FIG. 2 is a side view illustrating a state in which a ceiling surface blasting unit according to a preferred embodiment of the present invention is used. FIG. 2 is a side view of a ceiling surface cleaning unit according to a preferred embodiment of the present invention. FIG. 2 is a top view of a ceiling surface cleaning unit according to a preferred embodiment of the present invention. FIG. 2 is a front view of a ceiling surface cleaning unit according to a preferred embodiment of the present invention. FIG. 3A is a side view of the dry cleaning machine, FIG. 3B is a rear view, and FIG.

The ceiling surface cleaning unit 10 according to a preferred embodiment of the present invention is used as a device for cleaning the ceiling surface of a concrete structure, for example, the ceiling surface 50 of a box culvert type road tunnel that has been in service for more than 30 years, using a dry cleaning machine 30. The ceiling surface cleaning unit 10 of this embodiment is used by being installed on the work deck 41 of a known aerial work vehicle 40 as a support stand 41, and has the function of enabling the dry cleaning machine 30 to move stably along the ceiling surface 50 to be cleaned, thereby enabling the ceiling surface 50 of a box culvert type road tunnel, which is a concrete structure, to be efficiently cleaned by the dry cleaning device 30.

As shown in Figures 2 to 4, the ceiling surface cleaning unit 10 of this embodiment is a unit for cleaning ceiling surfaces that includes a dry blasting machine 30 and a movable rail section 18 for moving the dry blasting machine 30, and is installed on the work deck 41 of an aerial work platform 40, which is a support stand positioned below the ceiling surface 50 to be cleaned, so that the ceiling surface 50 can be blasted using the dry blasting machine 30. The unit is configured to include a base frame section 11 having the movable rail section 18 provided on its upper surface, lifting jacks 15 interposed between the base frame section 11 and the support stand (work deck) 41 and installed on all four sides of the base frame section 11, distance sensors 16 arranged on all four sides of the base frame section 11 to measure the distance to the ceiling surface 50 without contact, and at least two contact sensors 17 arranged on both sides of the dry blasting machine 30 to detect contact with the ceiling surface 50. The lifting jack 15 is controlled to raise and lower so that the distances to the ceiling surface 50 measured by the distance sensor 16 at at least three points are the same, and the running surface of the moving rail section 18 is positioned parallel to the ceiling surface 50. Then, while maintaining the running surface parallel to the ceiling surface 50, the contact sensor 17 is raised until it comes into contact with the ceiling surface 50, and the dry cleaning machine 30 is set in a state to clean the ceiling surface 50 (see Figure 1).

In this embodiment, the base frame portion 11 has a rectangular planar shape (see FIG. 3), the distance sensor 16 is disposed at the four corners of the base frame portion 11, and the contact sensor 17 is disposed at both ends of the base frame portion 11 in the long side direction X.

Furthermore, in this embodiment, the moving rail section 18 is configured to include a left-right rail member 18a and a front-rear rail member 18b.

In this embodiment, the box culvert type road tunnel, whose ceiling surface 50 is blasted by the ceiling surface blasting unit 10, is a hollow tunnel having a rectangular cross section, formed by a known construction method using, for example, cast-in-place concrete or precast concrete. In the case where the road surface 51 (see FIG. 1) of the road formed at the bottom of the hollow rectangular cross section has a longitudinal gradient, the box culvert type road tunnel is constructed with the ceiling surface 50 inclined in the direction of the tunnel extension so that the ceiling surface 50 also has a similar or substantially similar longitudinal gradient. In the case where the road surface 51 of the road formed at the bottom of the hollow rectangular cross section has a transverse gradient, the box culvert type road tunnel is constructed with the ceiling surface 50 formed horizontally or substantially horizontally in the transverse direction, without inclining with a similar transverse gradient.

In this embodiment, the work deck 41 of the vehicle for working at height 40, on which the ceiling surface cleaning unit 10 is installed, is a work vehicle equipped with a work deck 41 that can be raised and lowered by a known lifting mechanism 42, for example, on the bed of a truck, as shown in FIG. 1, and workers can use the flat work floor of the work deck 41 as a foothold to perform various high-altitude work. In addition, by installing various devices and equipment on the flat work floor of the work deck 41 as a support base, it is possible to perform high-altitude work using these devices and equipment, for example, by operating a remote controller (not shown) from the ground. In this embodiment, the work deck 41 can be raised and lowered from the bed part 43 of the vehicle for working at height 40 to a height of preferably about 0 to 3.4 m, for example, by operating a remote controller from the ground, and this allows the ceiling surface cleaning unit 10 installed on the work deck 41 to efficiently perform cleaning work on the ceiling surface 50 located at a considerable height.

In addition to the ceiling surface cleaning unit 10, the work deck 41 of the aerial work vehicle 40 can also be loaded with a control panel, air equipment, a generator, a dust collector, a compressor, etc. If it is not possible to load all of these devices and equipment onto the work deck 41 of the aerial work vehicle 40, an auxiliary transport vehicle (not shown), such as a 2-ton truck, can be used to transport the generator, dust collector, compressor, etc. loaded onto the vehicle to the cleaning location on the ceiling surface 50, and at the cleaning location on the ceiling surface 50, these devices and the ceiling surface cleaning unit 10 can be connected using known connecting means such as one-touch joints, cam locks, connectors, etc., so that the cleaning work on the ceiling surface 50 can be performed.

In this embodiment, the base frame 11 constituting the ceiling surface cleaning unit 10 is formed into a three-dimensional frame shape by, for example, assembling channel steel and angle steel, and has a rectangular planar shape with a width in the left-right direction Y of about 1750 mm and a length in the front-rear direction X of about 3000 mm, for example, so as to fit on the work deck 41 of the aerial work vehicle 40 (see FIG. 3). The base frame 11 has a pair of side channel steels 12a attached to both sides of the long side direction (front-rear direction X) of the rectangular frame-shaped upper frame 12 constituting the base frame 11, and the pair of side channel steels 12b are attached to the upper end surfaces of the side channel steels 12a, which are extended in the short side direction (left-right direction Y), and the pair of side channel steels 12a are provided in the middle of the pair of side channel steels 12a. The left-right rail members 18a constituting the moving rail section 18 described later are laid out in a state of extending parallel to each other.

The moving rail section 18 provided on the upper surface of the upper frame section 12 of the base frame section 11 includes a left-right rail member 18a for moving the dry blasting machine 30 in the left-right direction (short side direction) Y, and a front-rear rail member 18b for moving the dry blasting machine 30 in the front-rear direction (long side direction) X, as shown in FIG. 3. As described above, the left-right rail members 18a are laid on the upper end surfaces of a pair of side channel steels 12a and middle channel steels 12b attached to the upper frame section 12 forming the base frame section 11, and are provided in three rows extending parallel to the short side direction Y of the upper frame section 12. On the left-right rail members 18a, the transverse frame section 46 on which the front-rear rail members 18b are laid is placed so as to be able to travel in the left-right direction Y.

The horizontal frame section 46 is formed by assembling channel steel, angle steel, etc., and has a rectangular planar shape elongated in the front-rear direction X, with a width in the left-right direction Y of about 600 mm, and a length in the front-rear direction X of about 3200 mm, which is slightly longer than the length of the base frame section 11. A front-rear rail member 18b is laid on the upper end surfaces of the long side channel steel 46a arranged on the pair of left and right long sides that form the horizontal frame section 46. The dry blasting machine 30 is placed on the front-rear rail member 18b so that it can travel in the front-rear direction X. The surface including these upper end surfaces, which is defined by the upper end surfaces of the pair of front-rear rail members 18b, forms the running surface of the dry blasting machine 30.

The lateral frame section 46 is also fitted with running wheels 46b and a running drive device 46c (see FIG. 4) for moving the lateral frame section 46 along the left-right rail member 18a laid on the upper surface of the upper frame section 12 of the base frame section 11. In this embodiment, the moving rail section 18 is configured to include the lateral frame section 46, the running wheels 46b, the running drive device 46c, etc., in addition to the left-right rail member 18a and the front-rear rail member 18b.

The dry cleaning machine 30, which is movable in the long side direction (front-back direction X) and short side direction (left-right direction Y) of the upper frame part 12 of the base frame part 11 by the movable rail part 18, is composed of a running base part 31, an intermediate plate part 33 arranged above the running base part 31 with a load cell 32 interposed between it and the running base part 31, a cleaning machine mounting plate 35 arranged further above the intermediate plate part 33 with an air cylinder 34 interposed between it and the intermediate plate part 33, and a cleaning machine main body 36 supported and attached to the cleaning machine mounting plate 35, as shown in Figures 5 (a) to (c). Guide shafts 37 are provided standing upward from the four corners of the traveling base 31, and linear bushings 38 provided at the four corners of the cleaning machine mounting plate 35 are attached to these guide shafts 37, respectively, so that the cleaning machine mounting plate 35 can be guided by these guide shafts 37 and linear bushings 38 and raised and lowered in a stable state as the air cylinder 34 expands and contracts. The air cylinder 34 is designed to press the cutting disk 36a of the cleaning machine main body 36 against the ceiling surface 50.

The blasting machine body 36 can be used by making appropriate improvements to various known grinding machines capable of grinding concrete floor surfaces and the like to form a flat work surface. For example, a product name "New Tornado" (manufactured by CRT Corporation) can be preferably used as such a grinding machine. The blasting machine body 36 includes a cutting disk 36a, a suction dust collector 36b, a drive motor 36c, and the like. In addition, a scattering prevention member (not shown) made of a flexible spatula member or brush-like member is provided so as to surround the periphery of the cutting disk 36a. This makes it possible to effectively prevent dust generated when the cutting disk 36a is pressed against the ceiling surface 50 of a box culvert-type road tunnel while facing upward from leaking out of the blasting machine body 36. An exhaust pipe 49 is provided connected to the blasting machine body 36 (see Figures 1 and 2).

The running base 31 of the dry blasting machine 30 is fitted with running wheels 31a and a running drive 31b for running the dry blasting machine 30 along the front-rear rail member 18b laid on the upper end surface of the long side channel steel 46a of the lateral frame 46. This allows the dry blasting machine 30 to run in the long side direction X of the upper frame 12 along the front-rear rail member 18b laid on the upper surface of the lateral frame 46, and also allows the lateral frame 46 to run along the left-right rail member 18a laid on the upper surface of the upper frame 12 of the base frame 11, thereby allowing it to move in the short side direction X of the base frame 11.

The air cylinder 34, which is arranged to be extendable and contractible between the intermediate plate portion 33 of the dry cleaning machine 30 and the cleaning machine mounting plate 35, is attached to the front and rear of the cleaning machine mounting plate 35, respectively. When the cleaning machine mounting plate 35 is raised and lowered, the cutting disk 36a of the cleaning machine body 36 can be pressed against the ceiling surface 50 so that the pressing force of the cleaning machine body 36 against the ceiling surface of the road tunnel, measured by the load cell 32 interposed between the traveling base portion 31 and the intermediate plate portion 33, is, for example, 0.3 to 0.9 MPa. By using the air cylinder 34 as the cylinder member for raising and lowering the cleaning machine mounting plate 35, it is possible to follow and absorb unevenness of, for example, about ±40 mm that exists on the ceiling surface 50 of the road tunnel.

In this embodiment, the ceiling surface cleaning unit 10 is provided with lifting jacks 15 installed on all four sides of the base frame section 11 between the base frame section 11 and the work deck 41 of the aerial work platform 40, which serves as a support stand, distance sensors 16 arranged on all four sides of the base frame section 11 to measure the distance to the ceiling surface 50 without contact, and at least two contact sensors 17 arranged on both sides of the dry cleaning machine 30 to detect contact with the ceiling surface 50.

The lifting jacks 15 are attached to the four corners of the rectangular lower frame 13, which is assembled integrally with the upper frame 12 of the base frame 11 via the connecting frame 14 of a truss structure to form a three-dimensional frame shape, by being joined to the lower frame 13 and the connecting frame 14 by bolting or welding. The length of the lower frame 13 in the long side direction X is shorter than that of the upper frame 12. As a result, the lifting jacks 15 are provided in four locations in the four corner areas of the base frame 11, and are capable of expanding and contracting in the vertical direction.

In this embodiment, for example, a screw jack can be preferably used as each lifting jack 15. The lifting jack 15 can be extended and retracted by the driving force of, for example, a drive motor (not shown), preferably by operation from a remote controller. The lifting jack 15 is attached in a state in which the drive body part 15a to which the drive motor is connected is joined to the lower frame part 13 and the connecting frame part 14, and the extension part 15b (see FIG. 4) is extended vertically. In addition, the installation board part 15c is attached to the lower end of the extension part 15b of the lifting jack 15. By placing these four installation board parts 15c in close contact with the work floor of the work deck 41 of the aerial work vehicle 40, the ceiling surface cleaning unit 10 can be stably installed on the work deck 41 of the aerial work vehicle 40. By extending and retracting each of the lifting jacks 15 located in the four corner areas, the base frame section 11 and the travel surface formed by the moving rail section 18 attached to the upper frame section 12 on its upper surface can be raised and lowered, and the inclination can be easily adjusted so that the travel surface is positioned parallel or approximately parallel to the ceiling surface 50 to be cleaned.

The distance sensor 16 is arranged on all four sides of the base frame 11 and measures the distance to the ceiling surface 50 in a non-contact manner. In this embodiment, the distance sensor 16 is a known non-contact sensor that can detect the distance from the ceiling surface 50 of the road tunnel, for example, by detecting the reflected waves when an electromagnetic wave is emitted toward the ceiling surface 50. In this embodiment, the distance sensor 16 is attached to four base ends of erect rods 48 erected from the tips of the protruding support plates 47, which are provided to protrude in the front-rear direction X from each of the four corners of the base frame 11, so that the distance sensor 16 protrudes from the base ends (see Figures 2 and 3).

In this embodiment, the contact sensors 17, which are arranged on both sides of the dry cleaning machine 30 and detect contact with the ceiling surface 50, are attached to the tip of the erected rod 48 that stands up from the tip of the above-mentioned overhanging support plate 47 provided at the four corners of the base frame part 11, with the non-contact distance sensor 16 attached to the base end part, and are preferably provided at at least two locations, or four locations, on both ends of the long side direction of the base frame part that sandwiches the dry cleaning machine 30. The contact sensors 17 are arranged at a position higher than the cutting disk 36a of the cleaning machine main body 36 of the dry cleaning machine 30, for example, at a position about 5 cm higher than the cutting disk 36a. When the contact sensors 17 come into contact with the ceiling surface 50, the lifting of the cleaning machine main body 36 and the cutting disk 36a by the lifting jack 15 can be stopped.

The contact sensor 17 is a known sensor that includes, for example, a sensor body biased upward by a spring member, a limit switch, a switch adjuster, etc., and is preferably configured to detect contact with the ceiling surface 50 by pushing the sensor body against the biasing force of the spring member.

To blast the ceiling surface 50 of a box culvert-type road tunnel using the ceiling surface blasting unit 10 of this embodiment having the above-mentioned configuration, the ceiling surface blasting unit 10 is loaded onto the work deck 41 of the aerial work vehicle 40 without raising the work deck 41, and moved to the blasting location on the ceiling surface 53. Since the aerial work vehicle 40 can travel on the road in the same way as a general vehicle, the ceiling surface blasting unit 10 can be moved quickly to the blasting location on the ceiling surface 50 of the road tunnel.

At the location of the grinding and cleaning of the ceiling surface 50 of a box culvert-type road tunnel, auxiliary equipment such as a generator, dust collector, compressor, etc., loaded onto a following auxiliary transport vehicle as necessary, is connected to the ceiling surface grinding and cleaning unit 10 using a connection means such as a one-touch joint, cam lock, or connector. After that, the grinding and cleaning work of the ceiling surface 50 is performed as follows, using a remote controller such as a pendant switch connected to a control panel (not shown) installed on the aerial work vehicle 40.

In other words, in the blasting method of the present embodiment, the ceiling surface blasting unit 10 is used to blast the ceiling surface 50 of a box culvert-type road tunnel, which is a concrete structure. As shown in FIG. 1, the aerial work vehicle 40 loaded with the ceiling surface blasting unit 10 is moved to the blasting location on the ceiling surface 50, and then the four roller jacks 44 provided at the four corner areas of the loading platform 43 of the aerial work vehicle 40 are extended to bring the roller parts 44a at the lower ends into contact with the road surface 51, thereby allowing the aerial work vehicle 40, with its work deck 41 provided so as to be raised and lowered, and its loading platform 43 to be installed in a stable state.

Next, by operating the remote controller and preferably by viewing a monitor screen provided on the control panel, the distance to the ceiling surface 50 detected by each distance sensor 16 is checked, and the lifting mechanism 42 of the aerial work vehicle 40 is driven and controlled to raise the work deck 41 on which the ceiling surface cleaning unit 10 is installed, until the distance between the cutting disk 36a of the cleaning machine body 36 of the dry cleaning machine 30 and the ceiling surface 50 is, for example, about 170 to 200 mm.

The platform portion 43 of the aerial work vehicle 40 is positioned, for example, according to the slope of the road surface 51, and is not necessarily positioned horizontally. Therefore, it is necessary to adjust the work deck 41 raised by the drive of the lifting mechanism 42, and the running surface of the cleaning machine main body 36, which is driven by the moving rail portion 18 of the ceiling surface cleaning unit 10 mounted thereon, so that they are positioned parallel to the ceiling surface 50.

To adjust the running surface of the cleaning machine body 36 in the ceiling surface cleaning unit 10 mounted on the work deck 41 so that it is parallel to the ceiling surface 50, for example, first control the extension and contraction of two lifting jacks 15 provided on one side of the base frame section 11 in the short side direction Y, and while checking the distance to the ceiling surface 50 with the distance sensor 16, adjust so that the running surface of the cleaning machine body 36 is parallel to the ceiling surface 50, preferably in the short side direction Y perpendicular to the axial direction of the tunnel.

Then, for example, by controlling the extension and retraction of two lifting jacks 15 provided on one side of the base frame section 11 in the long side direction X, and checking the distance to the ceiling surface 50 with the distance sensor 16, the running surface of the scouring machine main body 36 is adjusted so that it is parallel to the ceiling surface 50, preferably in the long side direction X along the axial direction of the tunnel. This makes it possible to position the entire running surface parallel or approximately parallel to the ceiling surface 50.

Once the entire running surface is positioned parallel or approximately parallel to the ceiling surface 50, the lifting jacks 15, for example, located in the four corner areas of the base frame section 11, are controlled to extend simultaneously, and while maintaining the entire running surface positioned parallel or approximately parallel to the ceiling surface 50, the base frame section 11 and the attached cleaning machine main body 36 are raised until the contact sensor 17 detects contact with the ceiling surface 50.

By simultaneously extending the four lifting jacks 15, the base frame section 11 and the cleaning machine main body 36 are raised, and when the contact sensor 17 detects contact with the ceiling surface 50, the lifting of the base frame section 11 and the cleaning machine main body 36 is automatically stopped by controlling it with a remote controller. When the base frame section 11 is automatically stopped, the cleaning machine main body 36 can move vertically and horizontally while maintaining a predetermined gap, preferably about 5 cm, between the cutting disk 36a of the cleaning machine main body 36 of the dry cleaning machine 30 and the ceiling surface 50, so that the entire running surface can be positioned parallel or approximately parallel to the ceiling surface 50.

In this way, while maintaining a predetermined gap of about 5 cm between the cutting disk 36a of the sweeper body 36 and the ceiling surface 50, the running surface of the moving rail section 18 is positioned so that it is parallel or approximately parallel to the ceiling surface 50. Then, for example, with the dry sweeper 30 installed at the start position on the running surface, the cutting disk 36a of the sweeper body 36 is rotated by the drive motor 36c, and the air cylinder 34 presses the anti-scattering member (not shown) made of a spatula member, brush-like member, etc. around the cutting disk 36a against the ceiling surface 50 with a pressing force of, for example, 0.3 to 0.9 MPa.

While rotating the cutting disk 36a, the anti-scattering member around it is pressed against the ceiling surface 50, and while maintaining this state, the dry blasting machine 30, for example, is automatically run from a start position at one end of the long side direction X to the other end along the front-rear rail member 18b laid on the lateral frame section 46, for example. The front-rear rail member 18b is preferably provided with limit switches at both ends, so that when the dry blasting machine 30 travels on the front-rear rail member 18b and reaches the other end, it automatically stops running.

When the dry cleaning machine 30 automatically stops at the other end of the front-rear rail member 18b, the horizontal frame part 46 is moved along the left-right rail member 18a by, for example, about 200 to 300 mm in the short side direction Y and stopped. Thereafter, in the same manner as described above, the dry cleaning machine 30 is automatically moved from the other end to one end in the long side direction X along the front-rear rail member 18b of the horizontal frame part 46. In this way, by repeatedly moving and stopping the dry cleaning machine 30 in the long side direction along the front-rear rail member 18b and moving and stopping in the short side direction Y along the left-right rail member 18a of the horizontal frame part 46 while rotating the cutting disk 36a, it is possible to efficiently clean the entire ceiling surface 50 at the cleaning location where the aerial work vehicle 40 is installed.

Once the entire ceiling surface 50 at the cleaning location where the aerial work vehicle 40 is installed has been cleaned, the lifting jacks 15 arranged in the four corner areas of the base frame section 11 are controlled to simultaneously retract, and the dry cleaning machine 30 is lowered together with the base frame section 11, for example by about 10 cm, preferably while maintaining the running surface of the movable rail section 18 parallel or approximately parallel to the ceiling surface 50. The dry cleaning machine 30 is lowered together with the base frame 11 to separate the anti-scattering member of the cutting disk 36a from the ceiling surface 50, and then the roller parts 44a at the lower ends of the four roller jacks 44, preferably provided at the four corner areas of the platform part 43 of the aerial work vehicle 40, are brought into contact with the road surface 51, and while maintaining the aerial work vehicle 40 and its platform part 43 in a stable state, the aerial work vehicle 40 is operated at a low speed to move the ceiling surface cleaning unit 10 installed on the work deck 41, which is the support frame, to the next cleaning point adjacent to the current cleaning point.

Once the ceiling surface cleaning unit 10 has been moved to the next cleaning location, the same process as described above is repeated at that next cleaning location to clean the entire ceiling surface 50 at that next cleaning location.

Furthermore, by repeating the movement of the ceiling surface cleaning unit 10 and the cleaning of the ceiling surface 50 at the cleaning location, for example, when the cleaning of the ceiling surface 50 at the entire cleaning work site is completed, the lifting jacks 15 preferably arranged in the four corner areas of the base frame part 11 are fully contracted to lower the ceiling surface cleaning unit 10, and the dry cleaning machine 30 is moved to the center of the traveling surface and fixed there, and further the lifting mechanism 42 of the aerial work vehicle 40 is driven and controlled to lower the work deck 41 on which the ceiling surface cleaning unit 10 is installed to a storage position in the loading platform part 43, so that the aerial work vehicle 40 equipped with the ceiling surface cleaning unit 10 can be moved to another construction site.

Therefore, according to the ceiling surface cleaning unit 10 of this embodiment and the cleaning method using the same, the ceiling surface cleaning unit 10 is composed of a base frame part 11 having a movable rail part 18 provided on its upper surface, lifting jacks 15 interposed between the base frame part 11 and the support stand (work deck) 41 and installed on all four sides of the base frame part 11, distance sensors 16 arranged on all four sides of the base frame part 11 for measuring the distance to the ceiling surface 50 non-contact, and at least two contact sensors 17 arranged on both sides of the dry cleaning machine 30 for detecting contact with the ceiling surface 50. Therefore, the ceiling surface cleaning unit 10 is supported by the support stand (work deck) 41 and installed below and close to the ceiling surface 50, and is itself equipped with a function that allows the running surface of the dry cleaning machine 30 to be positioned parallel or approximately parallel to the ceiling surface 50 by the movable rail part 18 at a predetermined distance from the ceiling surface 50. As a result, the ceiling surface cleaning unit 10 of this embodiment is installed on the work deck 41 of the aerial work vehicle 40 as an optional support stand located below the ceiling surface 50 to be cleaned, and the ceiling surface 50 of a box culvert-type road tunnel, which is a concrete structure, can be efficiently cleaned using the dry cleaning device 30.

The present invention is not limited to the above embodiment and can be modified in various ways. For example, the concrete structure whose ceiling surface is to be cleaned by the ceiling surface cleaning unit of the present invention does not necessarily have to be a box culvert type road tunnel, but the concrete girder of a concrete bridge or the like can be used as a concrete structure, and the bottom part of the concrete structure can be used as the ceiling surface to be cleaned by the ceiling surface cleaning unit of the present invention. In addition, the support platform placed below the ceiling surface to be cleaned on which the ceiling surface cleaning unit is installed does not necessarily have to be the work deck of a high-altitude work vehicle, and may be a temporary scaffolding assembled below the ceiling surface to be cleaned, or a work cart that is movable below the ceiling surface to be cleaned. Furthermore, the lifting and lowering by the lifting jack can be controlled using three of the four distance sensors arranged on the four sides of the base frame part so that the distance from the ceiling surface is the same.

10 Ceiling surface cleaning unit 11 Base frame section 12 Upper frame section 12a Side channel steel 12b Middle channel steel 13 Lower frame section 14 Connecting frame section 15 Lifting jack 15a Drive main body section 15b Expandable section 15c Installation board section 16 Distance sensor 17 Contact sensor 18 Moving rail section 18a Left-right rail member 18b Front-rear rail member 30 Dry type cleaning machine 31 Travel base section 31a Travel wheels 31b Travel drive device 32 Load cell 33 Intermediate plate section 34 Air cylinder 35 Cleaning machine mounting plate 36 Cleaning machine main body 36a Cutting disk 36b Suction dust collection device 36c Drive motor 40 Aerial work vehicle 41 Work deck (support stand)
42 Lifting mechanism 43 Cargo platform 44 Roller jack 44a Roller section 46 Transverse frame section 46a Long side channel steel 46b Traveling wheels 46c Traveling drive device 47 Overhanging support plate 48 Standing rod 50 Ceiling surface 51 Road surface X Long side direction (front-rear direction)
Y Short side direction (left and right direction)

Claims (5)

A ceiling surface cleaning unit comprising a dry blasting machine and a moving rail section for moving the dry blasting machine, the ceiling surface being capable of being blasted by the dry blasting machine when installed on a support stand disposed below the ceiling surface to be blasted,
The dry cleaning machine is configured to include a base frame having the movable rail portion provided on its upper surface, lifting jacks disposed between the base frame and the support stand and installed on all four sides of the base frame, distance sensors disposed on all four sides of the base frame for non-contact measurement of the distance to the ceiling surface, and at least two contact sensors disposed on both sides of the dry cleaning machine for detecting contact with the ceiling surface,
This ceiling surface cleaning unit can be set in a state in which the ceiling surface is cleaned by the dry cleaning machine by controlling the lifting and lowering of the lifting jack through operation by an operator via a control panel so that the distances to the ceiling surface measured by at least three distance sensors are the same, aligning the running surface of the moving rail section parallel to the ceiling surface, and then, while maintaining the running surface parallel to the ceiling surface, raising the contact sensor until it comes into contact with the ceiling surface. A ceiling surface cleaning unit as described in claim 1, wherein the base frame portion has a rectangular planar shape, the distance sensors are arranged at the four corners of the base frame portion, and the contact sensors are arranged at the end portions on both sides of the long side of the base frame portion. The ceiling surface cleaning unit according to claim 1 or 2, wherein the dry cleaning machine is equipped with an air cylinder capable of pressing the cutting disk of the cleaning machine body against the ceiling surface. A ceiling surface cleaning unit according to any one of claims 1 to 3, wherein the moving rail section includes a left-right rail member and a front-rear rail member. A ceiling surface cleaning unit according to any one of claims 1 to 4, in which the support stand arranged below the ceiling surface to be cleaned is the work deck of an aerial work vehicle.

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