JPH0266004A - Air film type transporting device - Google Patents

Abstract

PURPOSE:To easily perform changing direction by forming air film after separating wheels from guide rails at transporting, and changing over the guide rails and taking down the wheels on the rails at changing direction, in the device in the title for super heavy structure such as ocean or harbor facilities. CONSTITUTION:At changing direction, an expanding mechanism 12 in the vertical direction of a transporting unit is contracted, a caison 10 is once taken down on the ground, wheels 23 are brought to be contacted on guide rails 41, sequentially after a fluid cushion part 30 is highly lifted, driving cylinders 47 for moving the guide rail are actuated, and the moving guide rail 45 is moved in the diagonal direction. By running the wheels on the guide rails 41 in this condition, the wheels are run in the changed direction along the side parts of the guide rails 41 guided with side rollers 24. In such manner, changing direction can be easily performed.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention is directed to horizontally positioning large concrete caissons and other super heavy objects (hereinafter referred to as caisson) used for external facilities of offshore port structures, etc., on the ground. The present invention relates to a pneumatic film transport device for transport, particularly a multiple pneumatic film transport device that can easily change direction during horizontal transport.

(Prior art) Conventional methods for transporting heavy objects on the ground include a method in which the heavy objects are supported by multiple self-propelled or driven carts and run on traveling rails, and a method in which the heavy objects are carried on air levitation carts. The cart is then slightly floated on the conveyance path (slideway), or an air film of pressurized air is formed in between, and the cart is pushed out from behind by a movement propulsion device using a reaction force using a hydraulic jack or hydraulic cylinder. There is a way to run it like this. When transporting such heavy objects, it is common for a plurality of supporting and moving devices such as trolleys to be spaced apart in the transport direction, and support and transportation are carried out using these plurality of trolleys. Because it has double brim-shaped wheels,
When changing the conveyance direction of heavy objects in the middle of the conveyance path, if you try to make a normal horizontal-vertical change using curved rails, you will have to lay rails with an extremely large radius of curvature, and multiple rails will overlap each other. It intersects with other rails. Therefore, to change the direction of this type of heavy goods transport vehicle, either move the trolley type using a crane or the like at the intersection of the transverse and vertical transport routes, or install dedicated trolley units for both the transverse and longitudinal transport routes. If we explain these two methods with reference to Figs. 6 and 7, first, (a) move caisson 2 to A with bogie 1. Transport from point to point B. (b) When reaching point B, lower the hydraulic jack on truck 1 and temporarily place caisson 2 on pedestal 3. (c) After installing pedestal 3, lower the jack on truck l. Lower it, move it back toward you, and lift it with a crane or the like to the right side in Figure 6.
(e) Move the trolley 1' to point C, the launching position. In addition, in the latter method, in which a dedicated trolley for traverse and a dedicated trolley for vertical travel are provided separately, (a) caisson 2 is transported to point B by transverse trolley l, and (b) upon arrival at point B, the hydraulic jack of trolley l is jack up, transport the vertical trolley 4, and (c) caisson 2.
Insert the bogie 4 directly under the caisson in the jacked state, (d) jack up the hydraulic jack of the bogie 4 to support the caisson 2, and then (e) lower the jack of the bogie l to return the bogie to the original point A. move the caisson 2 from point B to point C by lowering the jack of truck 4.
The method used was to move it to a specific location.

(Problems to be Solved by the Invention) Among the conventional direction change methods described above, the method of relocating the trolley each time requires a lot of effort and effort because the trolley itself is large and heavy, and it takes a lot of effort to lift and relocate it with a large crane. The latter method, which is time-consuming and dangerous, involves installing dedicated carts in advance on the retransport route, but the same number of carts must be prepared, which increases equipment costs, and, like the former, The work of reloading and positioning heavy objects is difficult.

Although it is relatively easy to change the direction of each individual trolley in the method of sliding air levitation trolleys on a slideway, for extremely heavy objects such as caissons, it is necessary to use a large number of air levitation trolleys in tandem. The carts and pushers arranged in horizontal rows in the transport direction are connected to each other with hydraulic and pneumatic hoses, and are connected to the hydraulic and pneumatic sources placed in each row at the rear, so when changing direction between vertical and horizontal. All of these hydraulic and pneumatic hoses must be replaced, and if there are many, 1
If there are nearly 00 hoses attached, it may be necessary to replace them, which poses a problem of lowering work efficiency.

An object of the present invention is to provide an air film type conveyance device suitable for conveying caissons and the like, which can easily change direction by simply changing the slideway at an intersection without requiring the attachment or change of hoses.

(Means for Solving the Problems) The air film type conveyance device according to the present invention supplies compressed air to a lower pressure chamber and blows it out from the pores on the lower surface of the lower pressure chamber to form an air film between it and the slideway. a fluid cushioning portion connected to the body of the unit via a bracket extending laterally and supported on a guide rail of the slideway when no load is applied; and a fluid cushion portion for the wheel portion. a conveyance unit having a vertically expanding and contracting mechanism section for vertically moving the fluid chamber, and a side roller section that can come into contact with a guide rail side section provided on a side section of the fluid compression section;
a movable guide rail provided at an intersection of the slideway and having a curved rail portion and movable in a diagonal direction of the intersection so as to smoothly join with a straight rail portion near the intersection; A plurality of conveyance units are connected in the traveling direction together with their air and hydraulic pressure supply hoses.

(Example) The present invention will be specifically described below with reference to the drawings.

FIG. 1 is a partially cutaway front view of an air film type conveying device according to an embodiment of the present invention when changing direction, and FIG. 2 is a partial side view of a plurality of devices connected together. FIG. 3 is a partially sectional front view of the embodiment of the present invention during transportation of the caisson. First, the conveyance unit according to the present invention will be described with reference to FIG. 3. A fluid cushion section 30 is provided on the lower side of the unit main body body section 20 so as to be movable up and down via a vertical extension/contraction mechanism section 12 such as a hydraulic jack. It is being The fluid pumping part 30 has a support frame 11, and a cylinder part 13 having an annular shape that is circular to the center of the frame is formed on the outer peripheral part of the support frame 11, and a ring-shaped piston packing member (ring A seal) 14 is inserted from the bottom of the cylinder. The piston packing member 14 is connected at its bottom by a bottom plate 15 having a plurality of pores 9. The space between the annular cylinder portion 13 of the support frame 11 and the piston packing member 14 serves as a primary pressure chamber 16, and the space between the lower surface of the support frame 11 and the bottom plate 15 serves as a secondary pressure chamber 17. As shown in the figure, an air pressure supply unit 18a is connected to the primary pressure chamber 16 and the secondary pressure chamber 17 via detachable piping. Note that the first order.

The pressure inlet of the secondary pressure chamber 16, 17 is connected to the pressure regulator 19.
are connected to each other via. The pressurized air brought into the secondary pressure chamber 17 is ejected from the pores 9 of the bottom plate 15 toward the road surface of the slideway 40, thereby causing a gap between the lower surface of the piston packing member 14 and the road surface of the slideway 40. An air film forms. Pressure oil is supplied to the cylinder of the vertically extending/contracting mechanism section 12 built into the unit main body body section 20 via a piping hose 8 connected to a hydraulic pressure supply unit 18b. Note that the air pressure supply unit) 18a and the hydraulic pressure supply unit 18b are mounted on a truck (not shown) and move on the slideway 40 together with the transport unit.

Leg-shaped wheel holding brackets 21 projecting laterally are attached to the outer periphery of the unit main body body 20 that constitutes the outer cylinder of the vertically extending/contracting mechanism 12 of a hydraulic jack, etc. A medium wide special wheel 23 without a brim is supported via a horizontal axle 22. The wheels 23 are located outside the annular cylinder portion 13 that forms the air film forming surface of the fluid cushion portion 30, and are located on the upper surface of the guide rails 41 that form both side edges of the slideway 40 when no load is applied. They are designed to roll in contact with each other. Further, on the outer side of the annular cylinder portion 13, a side roller 24 that contacts the inner surface of the guide rail 41 is pivotally supported via a suitable horizontal bracket (not shown). In addition, the wheel 23
The bracket 21 holding the main body 20 can pivot within a range around its central axis.

As shown in FIG. 2, a plurality of transport units 31 are arranged in the direction of the slideway 40, and the wheel holding brackets
The parts are pin-connected by a connecting ring 42. A carriage carrying the aforementioned pneumatic pressure supply unit 18a and hydraulic pressure supply unit) 18b is connected to the rear end of a plurality of connected transport unit rows, and the rearmost pneumatic and hydraulic supply units 18a, 18b are connected to each transport unit in this row. Pneumatic and hydraulic pressure is supplied. A plurality of such transport unit rows (for example, three rows) are arranged in a transverse direction with respect to the traveling direction, and each row moves on a corresponding slideway. Of course, an integral pneumatic and hydraulic supply unit 18a, 18b is provided for each row (at the rear of each row).

When a heavy object 10 such as a caisson is loaded on the upper surface of a plurality of transport units 31 and transported to a destination, first, the annular cylinder section 13 is extended downward by the vertical expansion/contraction mechanism section 12, and the heavy object 10 is connected to the ground surface. Create a space between. In this state, the wheel 2 at the lower end of the wheel holding bracket 21
3 introduces compressed air into the fluid filter section 30 floating above the upper surface of the guide rail 41 of the slideway 40 (FIG. 3) and blows it out from the lower surface to form an air film between the slideways 40. The transport units are pushed forward by a reaction force propulsion device (not shown) placed at the rear of the row of transport units. When transport is completed, the heavy object 10 is unloaded, and the unloaded transport unit is returned to its original position, when the sill of the vertical telescoping mechanism section 12 is contracted, the wheels 23 at the lower end of Brakent are is lowered and supported on the upper surface of the guide rail 41. In this state, the annular cylinder part 13 and the air film forming surface on the lower surface of the unit are connected to the slideway 40.
(FIGS. 1 and 2), and the weight of the entire transport unit is supported by the wheels 23. In this state, the transport unit is wheeled along the guide rail and returned to its original location.

Next, a direction change at a slideway intersection during transport of a heavy object will be explained. 4 and 5 are plan views of a slideway intersection according to an embodiment of the present invention, with FIG. 4 showing the state when the vehicle is traveling straight, and FIG. 5 showing the state of the intersection when changing direction.

At one corner of the intersection where the traversal path 43 and the longitudinal path 44 of the slideway intersect at right angles, the fixed side guide rail 41 is formed in an arc shape, and the intersection is in contact with the arc-shaped guide rail 51. A generally triangular moving guide rail 45 is provided inside. Referring to FIG. 4, the movable guide rail 45 has straight parts 45a and 45b on two sides that are perpendicular to each other and a curved part 45C that contacts the side surface of the circular arc guide rail 51 on the fixed side. When the curved portion is in contact with the guide rail 51 on the fixed side, the straight portions 45a, 45b are joined to the straight portion of the guide rail 41 on the fixed side without any step. A positioning roller 49 is provided on the curved portion 45C of the movable guide rail 45, and correspondingly the arc-shaped guide rail 5 on the fixed side is provided with a positioning roller 49.
1, a positioning bracket 5 that comes into contact with the roller 49;
0 is formed. The moving guide rail 45 is movable from this position in the diagonal direction of the intersection as shown in FIG. 46, and a pair of movable guide rail driving cylinders 47 are installed outside the fixed side arcuate guide rail 51. The piston rod 48 of the cylinder 47 passes through the arcuate guide rail 51 and is connected to the curved portion 45C of the movable guide rail 45. The movable guide rail 45 moves due to the bias of the cylinder 47, and its straight portion 45 a
, 45b come into contact with the straight portion of the fixed guide rail 41 on the opposite side, the curved portion 45C smoothly joins to the straight portion of the fixed guide rail 41. Such a moving guide rail 45 is provided at each intersection of a plurality of slideways.

When changing the direction of the transport unit 31 loaded with caisson, first, the vertical telescoping mechanism 12 of the transport unit is contracted at the intersection position, the caisson 10 is lowered to the ground, and the wheels 23 of the transport unit are moved onto the guide rail 41. After the fluid cushion portion 30 is raised significantly, the cylinder 47 for driving the moving guide rail is actuated, and the moving guide rail 45 is moved as shown in FIGS.
move diagonally. In this state, each transport unit row is guided by the side rollers 24 along the side of the guide rail by running the wheels on the guide rail (self-propelled or winch traction) as when transporting the transport unit when there is no load. drive to the direction change side. The last pneumatic-hydraulic unit-equipped trolley in each unit row will accompany the transport unit row if the vehicle height is such that it can pass under the caisson temporarily placed at the intersection, but if the vehicle is not high enough to pass under the caissons temporarily placed at the intersection, a crane, etc. After being transferred from the transverse path 43 to the longitudinal path 44 or from the longitudinal path 44 to the transverse path 43, it passes under the caisson 10 and is combined with the transferred conveyance unit row. In either case, it is not necessary to replace the empty or hydraulic hoses of the units in each transport unit row.

After the direction change is completed, the caisson is loaded again using the vertical expansion/contraction mechanism section of the transport unit, the wheels 23 are raised, and the caisson is transported with floating support by the fluid cushion section 30.

(Effects of the Invention) As explained above, according to the present invention, the conveyance unit is conveyed while forming an air film between the fluid cushion portion and the slideway with the wheels on the side of the conveyance unit separated from the guide rails of the slideway. However, when changing direction, the guide rails of the slideway are switched and the wheels are lowered onto the guide rails so that the entire transport unit row runs on wheels, so there is no need to change the empty or hydraulic supply hose between each transport unit. This has the effect of making it easy, safe, and quick to change direction while transporting the caisson.

The wheels that move on the guide rails are medium-wide wheels without brim, and the side rollers guide them along the sides of the guide rails, making it possible to have a small radius of curvature when changing direction, making it easier to avoid intersections. The area it occupies can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a front cross-sectional view of the pneumatic film conveyance device according to an embodiment of the present invention during direction change, Fig. 2 is a side view of a row of plural conveyance units connected together, and Fig. 3 is a caisson conveyance device (loaded). Time)
FIG. 4 is a plan view of the slideway intersection according to the embodiment of the present invention when traveling straight, FIG. 5 is a plan view of the slideway intersection when changing direction, and FIG. FIG. 7 is a side view and a plan view for explaining a conventional method for changing the conveyance direction in conveying heavy objects. 10... Caisson, 12... Vertical expansion/contraction mechanism section, 18
a...Air pressure supply unit, 18b...Hydraulic pressure supply unit, 20...Unit main body body, 21...Wheel holding bracket, 23...Wheel, 24
...Side roller, 30...Fluid pumping part, 3
1...Transportation unit, 40...Slideway, 4
1... Guide rail, 42... Connecting ring, 45...
Moving guide rail, 45C...curved part, 47...
Cylinder, 51...Fixed side circular guide rail. Sub-Agent Patent Attorney Toshiyoshi Somekawa Figure 1 Figure 3 Figure 2 Figure 2

Claims (1)

[Claims] A fluid cushion part that supplies compressed air to the lower pressure chamber and blows it out from the pores on the lower surface of the lower pressure chamber to form an air film between it and the slideway, and a bracket that protrudes laterally from the body of the unit body. a wheel portion connected to the slideway and supported on a guide rail of the slideway when no load is applied; a vertically extending/contracting mechanism portion that moves the fluid cushion portion up and down with respect to the wheel portion; a conveyance unit having a side roller part that can come into contact with a side part of the guide rail; and a curved rail part provided at an intersection of the slideway so as to smoothly join with a straight rail part near the intersection. 1. A pneumatic film conveyance device, comprising a movable guide rail that is movable in a diagonal direction of an intersection, and wherein a plurality of said conveyance units are connected in the running direction together with their pneumatic and hydraulic supply hoses.