JPH0462999B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a rope pulling mechanism used for moving heavy objects by pulling them with a rope, for example in construction work, and relates to a rope traction mechanism that is used for moving heavy objects by pulling them with a rope, for example in construction work. The rope can be pulled continuously by simply expanding and contracting a hydraulic cylinder installed along the rope's pulling direction.

The present invention also relates to an erection girder pushing device used to erect bridge girders and various other girder materials necessary for construction work when constructing elevated railways, elevated motorways, etc. The trolley with
The trolley can be moved forward continuously by simply repeatedly expanding and contracting a hydraulic cylinder having a mechanism similar to the above-mentioned rope pulling mechanism provided on the trolley.

[Conventional technology]

Towing and moving heavy objects using ropes is generally carried out by installing a winch and winding up the rope.

In the case of bridge girder construction work, a pulley device consisting of a fixed pulley, a movable pulley, and a rope is placed between the bogie suspending the rear end of the girder and the girder, and the rope is wound up with a winch. This moves the cart forward.

In addition, a hydraulic cylinder is installed between the rear bogie and the existing girder, the front end of which is fixed to the bogie, and the rear end of which is detachable from a fixed rope stretched over the existing girder. There are things that move us forward.

[Problem to be solved by the invention]

However, the winch used for pulling the rope is bulky and heavy, so it takes time and effort to move and install it, and the installation location may be limited because it interferes with surrounding objects.

A device that winds a rope to move a cart forward.
The area around the truck is often complicated by the ropes stretched over the existing girders and the installed winches, which often impedes work.

In addition, in the latter case, the intermittent pushing out of the bogie by the hydraulic cylinder is such that each time the hydraulic cylinder is extended, the rear end of the cylinder is removed from the fixed rope, the cylinder is retracted, and then the rear end of the cylinder is retracted. It is time consuming and troublesome because the work of securing it to a fixed rope must be repeated.

The present invention was proposed for the purpose of solving the problems in the above-mentioned conventional rope pulling mechanism and construction girder pushing device.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a base with a hydraulic cylinder that expands and contracts along the rope pulling direction, and fixes the rear end of the hydraulic cylinder to the base. A front cross member that is integrated with the front end and a rear cross member located behind the front cross member are provided with an automatic grasping mechanism that individually acts on the rope to be towed, and is attached to the front end of the base. The chain is wound from the front cross member to the rear cross member via the sprocket attached to the base, and the chain is wound from the rear cross member to the front cross member via the sprocket attached to the rear end of the base. The present invention is characterized in that an automatic grasping mechanism for the rear cross member operates when the hydraulic cylinder is extended, and an automatic grasping mechanism for the front cross member operates when the hydraulic cylinder is retracted.

In addition, as a device for pushing out the construction girder, a hydraulic cylinder that expands and contracts in the moving direction of the truck is provided on a truck that suspends the rear end of the construction girder, and the rear end is fixed to the truck. A cross member integral with the front end and a rear cross member disposed behind the cross member are provided with automatic grasping mechanisms that individually act on fixed ropes stretched over the existing girder along the moving direction of the bogie, A chain is wound from the front cross member to the rear cross member via the sprocket attached to the front end of the above-mentioned truck.
In addition, a chain is wound from the rear cross member to the front cross member via a sprocket attached to the rear end of the bogie, and when the above-mentioned hydraulic cylinder extends, the automatic grasping mechanism of the rear cross member operates, and when the hydraulic cylinder shortens. It is characterized by a structure in which an automatic grasping mechanism for the front cross member works.

[Effect]

In a rope traction mechanism, when fluid is alternately supplied to the front and rear chambers of the piston of a hydraulic cylinder, the cylinder repeats expansion and contraction. Combined with the traction effect provided by the rope, the rope is continuously pulled in one direction.

In the construction girder pushing device, when fluid is alternately supplied to the front and rear chambers of the piston of the hydraulic cylinder, the cylinder repeats expansion and contraction.
The truck that suspends the rear end of the construction girder is continuously moved forward by the alternating operation of a pair of front and rear automatic gripping mechanisms as the cylinder expands and contracts, and by the traction action via the chain.

〔Example〕

The structure of an embodiment of the rope pulling mechanism of the present invention will be described below with reference to the drawings.

Figure 1 is a plan view of the entire mechanism, Figure 2 is Figure 1
- A longitudinal side view of the fluid pressure cylinder section along line 2,
3 is a longitudinal sectional side view of the guide rod portion taken along the line 3-3 in FIG. 5-
FIG. 5 is a longitudinal cross-sectional side view of the automatic grasping mechanism portion taken along line 5;

On the upper surface of the rectangular plate-shaped base 1, along both short sides thereof, a pair of front and rear horizontal frames 2, which can be made of H-shaped steel, are installed.
3 is fixed.

A pair of left and right fluid pressure cylinders 4 along both long sides,
4 are arranged to connect the rear end of each cylinder portion to the rear horizontal frame 3, and the front ends of the piston rods 4a, 4a of each hydraulic cylinder are connected by a front cross member 5. The fluid pressure cylinder 4 is a double-acting type.

Pinions 6, 6 are attached near both ends of the front cross member 5, and mesh with racks 7, 7 provided along the long sides of the base 1, respectively.

A pair of left and right guide rods 8, 8 are attached between the front and rear horizontal frames 2, 3 inside the two fluid pressure cylinders 4, 4, and the guide rods 8, 8 penetrate the front cross member 5. .

The guide rods 8, 8 further pass through a rear cross member 9 arranged parallel to the front cross member 5 behind the front cross member 5 and inside the left and right hydraulic cylinders 4, 4.

The front cross member 5 and the rear cross member 9 both have guide rods 8,
It fits loosely compared to 8. In the figure, reference numeral 10 denotes a support member that supports the center portions of the guide rods 8, 8 between the front and rear cross members 5, 9.

Sprockets 11 and 12 are mounted inside the guide rods 8 and 8 at opposing positions on the rear surface of the front horizontal frame 2 and the front surface of the rear horizontal frame 3, respectively. From the front cross member 5 to the front cross frame 2 sprocket 11
A chain 13 is wound around the rear cross member 9 through the front cross member 5. In addition, the rear cross member 9
A chain 14 is wound around the front cross member 5 through the sprocket 12 of the rear cross frame 3. The above-mentioned winding chains 13 and 14 are provided in pairs on each side, that is, four on each side.

Inside the above left and right chain tensioning positions,
A rope passage hole 15 is commonly opened in the front horizontal frame 2, the front horizontal member 5, the rear horizontal member 9, and the rear horizontal frame 3 along the longitudinal centerline direction of the base 1.

And at the entrance of the rope passage hole 15 of the front cross member 5 and the entrance of the rope passage hole 15 of the rear cross member 9,
An automatic grasping mechanism 16 and 17 is provided, respectively. Although the automatic grasping mechanisms 16 and 17 work individually, both automatic grasping mechanisms are configured to automatically grasp the rope when the front cross member 5 and the rear cross member 9 begin to retreat. A known automatic grasping mechanism can be used.

The rope pulling mechanism is installed by fixing the base 1 to an immovable location. Then, the rope R to be towed is passed through the rope passing holes 15 of the front horizontal frame 2, the front automatic grasping mechanism 16, the front crosspiece 5, the rear automatic grasping mechanism 17, the rear crosspiece 9, and the rear horizontal frame 3.

In the front and rear chambers of the piston of the fluid pressure cylinder 4,
The fluid pressure cylinder 4 is repeatedly expanded and contracted by alternately supplying pressure fluid of high pressure oil.

When the front cross member 5 begins to move due to the forward movement of the piston rod 4a (toward the right in the figure), although the front automatic grasping mechanism 16 is released, the forward movement of the front cross member 5 moves the front cross member 5 through the rear chain 14. The rear cross member 9 begins to move backward, and the rear automatic grasping mechanism 1
7 grips the rope R, the rope R is pulled in the opposite direction to the forward movement direction of the piston rod 4a, and continues to be pulled until the piston rod 4a reaches its forward end.

When the piston rod 4a switches from forward movement to backward movement, the rear cross member 9 begins to move forward via the front chain 13 due to the retreat of the front cross member 5 (towards the left in the figure), and the rear automatic grasping mechanism is activated accordingly. 17
is released, but as the front cross member 5 retreats, the front automatic grasping mechanism 16 grasps the rope R, so that the rope R is pulled in the same direction as the retreating direction of the piston rod 4a.

When the piston rod 4a switches forward again, the automatic grasping mechanism 16 at the front releases the rope R.
The rear automatic gripping mechanism 17 grips the rope R and pulls the rope R in the opposite direction to the forward movement of the piston rod 4a, that is, the direction in which the hydraulic cylinder 4 extends.

The pinion 6 and rack 7 are provided to accurately synchronize the forward and backward movements of the left and right piston rods 4a.

The pair of left and right guide rods 8, 8 particularly support the rear cross member 9 and guide its longitudinal movement.

Pressure fluid is alternately supplied to the front and rear chambers of the piston by providing limit switches 18 and 19 near both ends of the rack 7 at the forward and backward ends of the piston rod 4a, and by electrical signals generated by opening and closing these switches. This is done by operating a switching valve.

The above-mentioned rope pulling mechanism is installed and fixed on the base 1, and the rope is pulled by repeating the expansion and contraction motion of the hydraulic cylinder as if it were being pulled by hand. It can be applied as a drive mechanism.

Figure 6 is a front view of the construction girder pushing device reaching the end of the existing girder, and Figure 7 is its side view.
In the figure, 20 indicates a pier, and 21 indicates a girder provided on the pier 20.

A rail 22 is installed on the existing girder 21 along the longitudinal direction of the girder.
A trolley 23 is placed on 2 via wheels 24. A mechanism A, which is the same as the rope pulling mechanism described above, is assembled on the floor 23a of this truck 23.

An arm frame 26 that is raised and lowered by a center hole jack 25 is provided on the front surface of the truck 23, and the rear end of the construction girder 27 is suspended by the arm frame 26. Reference numeral 28 denotes an auxiliary arm that connects the lower part of the rear end of the suspended construction girder 27 to the lower part of the truck 23.

In this construction girder pushing device, a fixed rope R is stretched over the existing girder 21 substantially parallel to the rail 22.

Therefore, in the forward movement of the piston rod, the front automatic gripping mechanism is released and the rear automatic gripping mechanism tries to grab the rope and pull it, but since the rope is fixed, it is relatively difficult to move toward the carriage 23. moves forward.

When the piston rod is switched to the backward position, the automatic grasping mechanism at the rear is released and at the same time, the automatic grasping mechanism at the front tries to grab and pull the fixed rope, so that the truck 23 moves forward.

That is, by repeatedly expanding and contracting the fluid pressure cylinder 4, the carriage 23 suspends the rear end of the construction girder 27.
continues to move forward.

Next, the process of girder erection work using the extrusion device of the present invention will be explained with reference to FIGS. 8 to 13.

Two piers have already been installed in sections where girder work can be done from ground level.
A digit 21 is provided above the 0. In a section M where girder work cannot be carried out from the ground because there is a road or railway below, the girder 27 is pushed out from one existing girder 21 to the other existing girder 21 on top of the existing girders 21.

(FIG. 8)...A construction girder 27 is mounted on the existing girder 21, with a hand stretching machine 29 attached to the front end and an extrusion truck 23 coupled to the rear end.
The position in front of the center of gravity of the erection girder 27 is the position of the bogie 30.
It is supported by

(Fig. 9)...Rollers 31 and 32 are placed at opposite ends of the existing girders 21 and 21 before and after the section M where the girder 27 is passed, respectively, and the push-out cart 23
is actuated to advance the girder 27 upwardly in section M.

When the construction girder 27 is placed on at least the front support roller 31, the support cart 30 at the front of the construction girder 27 is removed.

(Fig. 10)...The construction girder 27 is gradually pushed out and the hand stretching machine 29 is moved to the support roller 32 on the opposite side.
Published in

At this time, the center of gravity of the construction girder 27 moves slightly in front of the front support roller 31, so the push-out cart 23 floats up while holding the rope R.

(Fig. 11)...The construction girder 27 is further pushed out, and when the rear end of the construction girder 27 reaches the front support roller 31, the push-out cart 2
Stop the operation of 3.

(FIG. 12)...The support roller 31 on which the rear end of the construction girder 27 is placed is removed, and the push-out truck 23 is grounded. The support roller 32 on which the hand rolling machine 29 is mounted is also removed and the other pillow material 33 is
intervene.

(Fig. 13)...The auxiliary arm 28 (shown in Fig. 7) supporting the rear lower part of the construction girder 27 is removed, and the rear end of the center hole jack 25 of the extrusion truck 23 and the hand stretching machine 29 are provided. The construction girder 27 is lowered by operating the center hole jack 34, and the construction girder 27 is passed between the existing girders 21, 21.

〔Effect of the invention〕

Since the rope pulling mechanism of the present invention has the above-described configuration, the rope can be pulled continuously in one direction simply by repeatedly extending and contracting the fluid pressure cylinder, and the fluid pressure cylinder that is the driving source is parallel to the rope. Coupled with the fact that it is installed in a large area, the entire mechanism is flat and compact. Therefore, it does not disturb the surroundings and is suitable for installation at construction sites. Moreover, it is lighter than conventional winches, making it easier to move and transport the installation location.

Furthermore, since the construction girder pushing device of the present invention has the above-mentioned configuration, it is possible to continuously advance the cart that suspends the rear end of the construction girder by simply repeating the expansion and contraction operation of the fluid pressure cylinder that is the drive source. This makes it easy to operate the construction girder push-out device.

Since only a fixed rope is stretched over the existing girder where the push-out truck is mounted, there are fewer obstacles around the truck, which improves work efficiency and safety.

[Brief explanation of the drawing]

Figure 1 is a plan view of the rope traction mechanism of the present invention;
The figure is a longitudinal sectional side view of the fluid pressure cylinder section taken along line 2-2 in Fig. 1, Fig. 3 is a longitudinal sectional side view of the guide rod section taken along line 3-3 in Fig. FIG. 5 is a longitudinal side view of the automatic grasping mechanism section taken along line 5-5 in FIG. 1, FIG. 6 is a front view of the erection girder pushing device,
FIG. 7 is a side view of the erecting girder pushing device, and FIGS. 8 to 13 are process charts sequentially explaining the steps of girder erection work using the erecting girder pushing device of the present invention. 1... Base, 2... Front horizontal frame, 3... Rear horizontal frame, 4... Fluid pressure cylinder, 5... Front horizontal member, 6
... Pinion, 7 ... Rack, 8 ... Guide rod, 9
...Rear cross member, 10... Support member, 11, 12...
...Sprocket, 13, 14...Chain, 15
...Rope passing hole, 16...Front automatic grasping mechanism,
17... Rear automatic grasping mechanism, 18, 19... Limit switch, 20... Pier, 21... Existing girder,
22...Rail, 23...Pushing trolley, 24...
... Wheels, 25, 34 ... Center hole jack, 26 ... Arm frame, 27 ... Erection girder, 28 ... Auxiliary arm, 29 ... Hand stretching machine, 30 ... Support cart, 3
1, 32... Support roller, 33... Pillow material, A...
Rope traction mechanism, R...rope.

Claims (1)

[Claims] 1. A hydraulic cylinder that expands and contracts along the rope pulling direction is provided on the base, the rear end of the hydraulic cylinder is fixed to the base, and the front end is integral with the front end of the hydraulic cylinder. The front cross member and the rear cross member placed behind the front cross member are equipped with an automatic grasping mechanism that acts individually on the rope to be towed, and the front cross member is installed on the front cross member and the rear cross member placed behind the front cross member. A chain is wound from the rear cross member to the rear cross member, and from the rear cross member to the front cross member via the sprocket attached to the rear end of the base. A rope traction mechanism configured such that an automatic material grasping mechanism operates and an automatic front horizontal material grasping mechanism operates when the hydraulic cylinder is shortened. 2. A truck that suspends the rear end of the construction girder is provided with a hydraulic cylinder that expands and contracts in the direction of movement of the truck, the rear end of which is fixed to the truck, and a cross member that is integrated with the front end of the hydraulic cylinder; An automatic grasping mechanism is provided on the rear cross member disposed behind the cross member, and an automatic grasping mechanism that individually acts on fixed ropes stretched over the existing girder along the moving direction of the truck, and a sprocket attached to the front end of the truck. The chain is wound from the front cross member to the rear cross member through the sprocket attached to the rear end of the bogie, and the chain is wound from the rear cross member to the front cross member via the sprocket attached to the rear end of the bogie. An erecting girder pushing device configured such that an automatic grasping mechanism for a cross member is activated, and an automatic grasping mechanism for a front cross member is activated when a hydraulic cylinder is shortened.