JPH0250243B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for transporting structures such as bridge girders.

Conventionally, when transferring a bridge girder from a riverbank etc. to a bridge pier during bridge girder erection work, the bridge girder is placed on a transfer device and the wire connected to the bridge girder is wound up with a winch to pull the bridge girder onto the transfer device. It is being transferred by sliding it. However, with this conventional construction method, connecting the wire to the bridge girder is troublesome, and since the winding of the wire is done using a winch from a location far away from the bridge girder, it is difficult to work with workers on the riverbank where the transfer device is installed. It was difficult to communicate with the workers operating the winch, and the coordination of work did not go well.
There were problems with work efficiency and work safety.

On the other hand, as a conventional example of the transfer device, there is one shown in FIG.

This transfer device D is equipped with a large number of rollers 31 as sliding means for the bridge girder C, and the rollers 31 are connected in pairs by a connecting rod 32, and the set of rollers 31 is attached to a base 34 by a support rod 33. It has a structure that supports it so that it can swing up and down. In such a transfer device D, the bridge girder C and the roller 31 are in line contact,
Stress is concentrated at the contact portion of the bridge girder C with the roller 31, which may cause damage to the bridge girder C. In order to prevent this damage, conventional bridge girders have been reinforced at each part to a level higher than originally required so that they can withstand stress concentration during transportation. Therefore, conventional bridge girders use a large amount of steel, resulting in high costs.

By the way, the feeding surface of a bridge girder is often not uniformly flat but partially protrudes. If there is a protrusion on the feeding surface of the bridge girder in this way, the height position of the roller 31 cannot be changed according to the protrusion in the conventional transfer device D, so the roller 31 is caught on the protrusion and the bridge girder is transferred. There is a risk that the bridge girder may be stopped or the bridge girder may be damaged by impact when the roller 31 rides over the protrusion. For this reason, conventionally, steel materials were separately attached to both sides of the protrusion, the long section on both sides of the protrusion was used as a gently sloped surface during the transfer operation, and the steel materials were removed after the transfer operation was completed, which was a tedious task. , resulting in a decline in transfer workability.

In addition, bridge girders are not only straight but also bent or curved, and when such non-linear bridge girders are transferred by the conventional transfer device D, once the conventional device D is installed, the position Also, since it is difficult to change the direction, there is a risk that the bridge girder will come off the rollers 31. Therefore, in the conventional device D, the length of the roller 31 is made much longer than the width of the bridge girder, but making the roller 31 longer in this way leads to an increase in the size of the entire device.

The present invention has been made with the aim of solving the above-mentioned technical problems, and it greatly improves the workability of transporting structures, and also allows structures to be transported without reinforcing them as in the past. The cost of objects can be reduced, structures with protrusions on the feeding surface can be transferred without any problems, and non-linear structures can be reliably transferred even if the device itself is small. The present invention provides a structure transfer device as described above.

The first invention of the present application which achieves the above object supports an oblong support body having a straight portion on support legs standing on a pedestal, and an annular chain roller is rotatably wound around the outer periphery of the support body. and a driving means for driving the endless track belt, and a driving means for driving the endless track belt, and a drive means for driving the endless track belt, and a drive means for driving the endless track belt, and a drive means for driving the endless track belt, and a drive means for driving the endless track belt. A main drive ram that contracts when pressed; a follower ram that is linked to the main drive ram via pressure oil and supports a structure with a flat support; and a pressure oil in an oil chamber facing the main drive ram that is kept at a predetermined pressure or higher. Each of the hydraulic jacks is equipped with a relief valve for releasing water.

Further, in the second invention, a pair of support legs are provided on the pedestal so as to be slidable left and right with respect to the transport direction of the structure, and a hydraulic cylinder is installed to bias these support legs and slide them separately. An oblong support having a straight portion is constructed across the support legs, and both ends of the support are supported by the support legs so as to be rotatable left and right with respect to the direction of transport of the structure, and the outer periphery of the support is A ring-shaped chain roller is rotatably wound around the outer periphery of the chain roller, and an endless track belt is rotatably wound around the outer periphery of the chain roller, and driving means for driving the endless track belt is provided. The strip plate includes a main drive ram that engages with the support body and contracts when pressed, a follower ram that is interlocked with the main drive ram via pressure oil and supports the structure with a flat support part, and the main drive ram. Each hydraulic jack is provided with a relief valve that releases pressurized oil in the facing oil chambers at a predetermined pressure or higher.

That is, according to the first invention, the following effects are achieved.

By placing a structure on the hydraulic jacks of each strip of the endless track belt in the straight part of the support and in this state starting the driving means of the endless track belt, the endless track belt moves around the chain roller. The driven rams of the hydraulic jacks, which rotate as each roller rotates and extend to the same height, support and transport the structure, so the transport speed and state of the structure can be controlled by the transport device. It can be confirmed and checked on the riverbank etc.
Compared to the conventional method of pulling structures using wires and winches, the transfer work efficiency can be greatly improved, and work safety is also excellent.

Since the support part of the driven ram of each hydraulic jack that supports the structure is flat, the support part and the structure come into surface contact, so that the structure is not subjected to local concentrated stress, and the structure is It becomes possible to transport the structure without any reinforcement, which reduces the cost of the structure.

When there is a protrusion on the feed surface of a structure, the pressure oil in the oil chamber facing the driving ram escapes through the relief valve of the hydraulic jack that supports the protrusion, and the extension movement of the driven ram is lower than that of other hydraulic jacks. Since the structure is regulated, the transfer surface of the structure in the transfer device is partially recessed according to the protrusion, and structures with protrusions on the transfer surface can be smoothly transferred while being maintained horizontally without any processing. .

Further, according to the second invention, in addition to the effects of the first invention, the following effects are achieved. That is, by simultaneously sliding a pair of support legs in the same direction with a hydraulic cylinder, the support body is moved in parallel, or by sliding the other support leg with one support leg fixed, or by moving the pair of support legs in parallel. By sliding them in opposite directions at the same time, the support rotates from side to side in the plane.
The position and orientation of the support can be changed depending on the degree of curvature of the non-linear structure, and even if the device itself is small, the non-linear structure can be reliably transferred.

Embodiments of the present invention will be described below with reference to the drawings.

1 to 9 show an embodiment of the first invention, and FIGS. 10 to 12 show an embodiment of the second invention.

First, the embodiment of the first invention shown in FIGS. 1 to 9 will be described.

The main components of the transfer device A of this embodiment include a pair of support legs 2 standing on a pedestal 1, a support body 3, a chain roller 4, a track belt 5, and a drive means for the track belt 5. It is equipped with a hydraulic jack 6.

The support legs 2 are for supporting the support body 3,
The support body 3 is configured to be extendable and retractable using a hydraulic cylinder so that the height position thereof can be adjusted, and is fixed on both sides of the base 1.

The support body 3 supports the structure C via a chain roller 4, a track belt 5, and a hydraulic jack 6, and is formed by connecting left and right side walls 3a and 3b with a connecting member 3c, and the outside of the side walls 3a and 3b It is attached and supported to the upper end of the support leg 2 via side plates 7 and 8 fixed to the support leg 2. The outer shape of the side walls 3a and 3b is an oblong ellipse with a long straight portion to ensure the length to support the structure C.

The chain roller 4 is for reducing the circumferential resistance of the endless track band 5, and is made up of a large number of rollers 4a connected by a chain 4b.
b It is wound around the outer periphery via the guide groove 9 so as to be rotatable.

The endless track band 5 engages with the structure C via a hydraulic jack 6 and transports the structure C together with the jack 6, and is wound around the outer periphery of the chain roller 4 so as to be rotatable.

The driving means for the endless track belt 5 is a hydraulic motor 51;
It consists of a pair of gears 52 and 53 that are driven in conjunction with this hydraulic motor 51 and mesh with teeth 5b provided on both sides of each band plate 5a of the endless track band 5. A hydraulic motor 51 is installed within the support 3 and is connected to a support shaft 57 of gears 52, 53 via a reduction gear train or sprocket 54, 55 and a chain 56.

The support shaft 57 is rotatably supported by the support body 3, and supports gears 52 and 53 at both ends thereof. gear 5
2 and 53 are on both sides of the support 3 and rotate at a very low speed, and the endless track belt 5 in the circular arc portion of the support 3
meshes with the teeth 5b of each band plate 5a, and the endless track band 5
It is something that moves around the world.

The hydraulic jack 6 supports the structure C.
Each band plate 5a of the endless track band 5 is provided with the same body, and includes a driving ram 6a and two driven rams 6b. A pressure receiving plate 12 is attached to the tip of the protrusion from the cylinder 6d via a ball joint 11, and the driving ram 6a contracts when the pressure receiving plate 12 comes into contact with the guide plate 10 of the support body 3 and is pressed. , which causes the driven ram 6b to extend. A plurality of rollers 14 are attached to the pressure receiving plate 12 in order to reduce frictional resistance with the guide plate 10. Further, a spring 13 is installed between the pressure receiving plate 12 and the cylinder 6d, and the driving ram 6a is urged in the direction of the extension operation via the spring 13.
The guide plate 10 with which the pressure receiving plate 12 engages is provided horizontally over almost the entire length of the upper side walls 3a, 3b of the support body 3, and both ends are located at the boundary between the straight part and the circular arc part of the side walls 3a, 3b. The pressure receiving plate 12 is first engaged with the pressure receiving plate 12 at its inclined side portions 10a and 10b. The oil chamber 15 in the cylinder 6d facing the driving ram 6a is communicated with the oil chamber 16 facing the driven ram 6b via a check valve 17, and communicates with the empty chamber 19 on the opposite side of the driving ram 6a via a relief valve. 18. The check valve 17 is connected to a pilot rod 21 projecting outward from each band plate 5a of the endless track band 5, and is opened by the pilot rod 21. Vacant room 19 is check valve 2
It is communicated with the oil chamber 15 through 0a, and with the atmosphere through an air bleed check valve 20b. The driven ram 6b is provided with a flat support portion 6f via a ball joint 22 at the tip of the protrusion from the cylinder 6e, and supports the structure C by the support portion 6f. A pressure accumulating chamber 6h is formed inside the driven ram 6b to compress and store the nitrogen gas in the gas chamber 6g of the cylinder 6e.

The transfer device A of the embodiment as described above places the structure C on the hydraulic jack 6 of the endless track band 5 in the straight part of the support body 3, and starts the hydraulic motor 51 in this state. The endless track band 5 rotates in accordance with the circumferential movement of the chain roller 4 and the rotation of each of its rollers 4a, and each hydraulic jack 6 moves together with the endless track band 5, so that the structure C is supported by the hydraulic jack 6. be transported. That is, the hydraulic jack 6 is compressed by being pressed in stages as its main driving ram 6a contacts the inclined side 10a of the guide plate 10 on the rear side in the moving direction via the pressure receiving plate 12.
At the same time, the driven ram 6b is expanded by the pressure oil flowing into the oil chamber 16, and supports the structure C via the support portion 6f. The amount of extension of the driven ram 6b of each hydraulic jack 6 is equal if the feeding surface of the structure C is flat, and the feeding surface of the transfer device A is made flat. When there is a protrusion C ₁ on the feeding surface of the structure C, a hydraulic jack 6 that supports the protrusion C ₁
As the driven ram 6b is pressed down by the protrusion _C1 , the pressure in the oil chamber 15 on the main driving ram 6a side increases, and the pressure oil in the oil chamber 15 is released to the empty chamber 19 by the relief valve 18. Thus, the extension operation of the driven ram 6b is restricted. Therefore, the hydraulic jack 6 supporting the protrusion C ₁ becomes lower than the other hydraulic jacks 6, the transfer surface of the transfer device A is partially depressed, and the structure C is transferred while maintaining a horizontal state. When the hydraulic jack 6 moves and reaches the arcuate portion of the support body 3, the pilot rod 21 comes into contact with a protrusion 8a provided on one of the left and right side plates 7, 8, for example, the right side plate 8, and is pressed.
Open check valve 17. Then, the driven ram 6b detached from the structure C is urged by the gas pressure in the pressure storage chamber 6h and contracts, and the oil in the oil chamber 16 on the driven ram 6b side flows into the oil chamber 15 on the main ram 6a side. Then, the driving ram 6a comes off the guide plate 10 and is urged by the spring 13 to extend. This extension operation of the driving ram 6a is carried out to the maximum stroke by exhausting the air in the empty chamber 19 through the check valve 20b. The hydraulic jack 6 that has passed through the arc portion of the support body 3 is reversed so that the driving ram 6a is on the upper side.
On the other hand, in the hydraulic jack 6 that was supporting the protrusion C ₁ of the structure C, the driven ram 6b is contracted and the main driving ram 6a is extended, as in the other hydraulic jacks 6, so that the oil on the driven ram 6b side is The oil in the chamber 16 flows into the oil chamber 15 on the drive ram 6a side, and the oil in the empty chamber 19 returns to the oil chamber 15 via the check valve 20a due to its own weight as the hydraulic jack 6 reverses.

Next, the embodiment of the second invention shown in FIGS. 10 to 12 will be described.

The transfer device B of this embodiment is obtained by adding a slide mechanism for the support legs 2 to the device A of the first embodiment,
The position and orientation of the support body 3 can be changed, and the other structure is the same as that of the embodiment A, so each member is given the same reference numeral and a description thereof will be omitted.

The support legs 2 of this embodiment device B are provided on the pedestal 1 so as to be able to slide left and right with respect to the direction in which the structure C is transferred, and are biased to slide by each pair of hydraulic cylinders 23 and 24. . Support leg 2
The sliding movements are performed separately or simultaneously and are guided by guides 25 and 26 made of angle members. The guides 25 and 26 are fitted on both sides of the base 2a below the support leg 2 with a gap in between. The gap between the guides 25, 26 and the base 2a in the front-rear direction forms a clearance when the trajectory of the support leg 2 traces an arc.

Hydraulic cylinders 23 and 24 for energizing the support leg 2 are fixed to both sides of the pedestal 1 via brackets 27, and the tips of the actuating rods 23a and 24a are in contact with a contact plate 28 provided on the base 2a of the support leg 2, respectively. or connected. On the other hand, since the support leg 2 is made slidable, both ends of the support body 3, that is, both ends of the left and right side plates 6 and 7, are supported by the upper end of the support leg 2 via a support shaft 29 so as to be rotatable left and right.

In the transfer device B of the embodiment described above, the hydraulic jack 6 moves with the rotation of the endless track belt 5 to support and transfer the structure C, as in the device A of the embodiment. If C is non-linear, slide the support leg 2 and change the position and orientation of the support body 3 according to the degree of bending of the structure C,
This is to maintain proper contact between the support portion 6f of the hydraulic jack 6 and the structure C. That is, by simultaneously extending the hydraulic cylinders 23 or 24 on one side, the support legs 2 slide and the support body 3 is moved in parallel to either the left or right with respect to the direction in which the structure C is transferred.

Further, the orientation of the support body 3 can be changed from side to side by sliding the other support leg 2 while one support leg 2 is fixed, or by simultaneously sliding both support legs 2 in opposite directions.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the transfer device of the first invention of the present application, FIG. 2 is a plan view of the same, FIG. 3 is a side view of the same, and FIG.
The figure is a sectional view taken along the - line in Fig. 1, Fig. 5 is a sectional view taken along the - line in Fig. 2, Fig. 6 is an enlarged front view of main parts, Fig. 7 is a sectional view taken along the - line in Fig. 6, and Fig. 8 is a sectional view taken along the - line in Fig. 1. The figure is a sectional view taken along the line - in Fig. 7, Fig. 9 is an operation explanatory diagram, and Fig. 10 is a sectional view taken along the line -
11 is a plan view of the same, FIG. 12 is a sectional view taken along line XII-XII of FIG. 10, and FIG. 13 is a front view of a conventional example. In addition, in the figure, A, B, D... transfer device, C... structure, 1... pedestal, 2... support leg, 3... support body,
4... Chain roller, 5... Endless track belt, 5a
... Band plate, 5b... Teeth of band plate, 51... Hydraulic motor, 52, 53... Gear, 6... Hydraulic jack,
6a...driving ram, 6b...driven ram, 6f...
Support part, 15, 16... Oil chamber, 18... Relief valve,
23, 24... Hydraulic cylinder.

Claims (1)

[Scope of Claims] 1. An oblong support having a straight portion is supported on support legs standing on a pedestal, and an annular chain roller is rotatably wound around the outer periphery of this support, and An endless track belt is wound around the outer periphery of the chain roller so as to be able to rotate around the chain roller, and a driving means for driving the endless track belt is provided. a working traction ram;
A hydraulic jack comprising a driven ram that is interlocked with the main driving ram via pressure oil and supports a structure with a flat support part, and a relief valve that releases the pressure oil in the oil chamber facing the main driving ram at a predetermined pressure or higher. A structure transfer device comprising: 2. Transportation of the structure according to claim 1, wherein the driving means comprises a hydraulic motor and a gear that is driven in conjunction with the hydraulic motor and meshes with teeth provided on each band of the endless track band. Device. 3 A pair of support legs are provided on the pedestal so as to be slidable left and right with respect to the transport direction of the structure, and a hydraulic cylinder is installed that biases these support legs to slide them separately. A long elliptical support body with a straight part is constructed, and both ends of the support body are supported by support legs so as to be rotatable left and right with respect to the transport direction of the structure, and an annular chain roller is attached to the outer periphery of the support body. is rotatably wound around the chain roller, and an endless track belt is rotatably wound around the outer periphery of the chain roller, and a driving means for driving the endless track belt is provided. A main drive ram that engages with a support body and contracts when pressed; a follower ram that is interlocked with the main drive ram via pressure oil and supports a structure with a flat support; and an oil chamber in which the main drive ram faces. A structure transfer device comprising hydraulic jacks each equipped with a relief valve that releases pressure oil at a predetermined pressure or higher.