JPS6223859Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a portal type work machine.

For example, the one shown in FIG. 1 is known as a gate-type working machine for bank reinforcement work carried out in conjunction with river bank dredging work. That is, main body 1
, a fixed leg 2 hanging down from one side of the lower surface of the main body 1, a swinging leg 4 hanging down from the other side of the lower surface of the main body 1 via a swinging leg fulcrum 3, and each leg. A traveling device 6 is disposed at the lower ends of 2 and 4 via a bogie portion 5 and is placed on a rail 8 on an embankment 7, and a gantry upper loading device 9 is disposed on the main body 1.
``For example, a pile driving device.''

In the above configuration, the center portion of the main body 1 is cut along a cutting line along the longitudinal direction of the rail 8, and an appropriate width l is set between the cut surfaces in accordance with changes in the rail span L due to changes in river width. A rail span adjustment spacer 10 is provided and the spacer 10 is secured to the main body 1 with bolts and nuts via a reinforcing plate 11. With this conventional configuration, the spacer 10
In order to replace this spacer 10, it is necessary to remove and attach the upper loading device 9, and disassemble and assemble the main body 1, which increases the number of work days and costs. It has the disadvantage of being quite expensive.

Therefore, the present invention provides a gate-type working machine that eliminates such drawbacks.

An embodiment of the present invention will be described below with reference to FIGS. 2 to 5. Note that articles that are the same as those shown in FIG. 1 are given the same reference numerals, and description thereof will be omitted. Reference numeral 15 denotes a pair of guide frames disposed at both corners of the other side of the lower surface of the main body 1 along the transverse directions A and B of the rail 8, and 16 is fixed to the lower surface of the main body 1 between the guide frames 15. The sliding plates 17 are a pair of rocking leg fulcrums, whose upper parts are slidably inserted into both guide frames 15 in the directions of arrows A and B, and whose lower surfaces have a cross section along the longitudinal direction of the rail 8. The support bearing part 18 having a semicircular recess 18a and the convex part 19a having a semicircular cross section on the upper surface fit into the recess 18a rotatably in the directions of arrows C and D, and the upper surface of the pair of swing legs 4 supporting shafts 19 each fixed to the
The central through hole 20a is welded to both ends of the support shaft 19, and the projections 1 at both ends of the support shaft 19 are welded to both ends of the support shaft 19.
9b, a retaining plate 21 fixed to the end face of each of the projections 19b, and a retaining plate 22 fixed to the lower surface of each guide frame 15.
It consists of. 23, the cylinder body is connected by a pin to a bracket 24 on the lower surface of the main body 1, and the tip of the piston rod is connected to a bracket 25 of each support bearing part 18.
A pair of hydraulic cylinder devices connected by pins.

The operation of the above configuration will be explained based on FIG. 5.
First, as shown by the solid line in Figure 5, when moving the gate type work machine located in section A where the rail span L ₁ is large in the direction of arrow E and bringing it through section B to section C where the rail span L ₃ is small, First, each traveling device 6 is driven to move the work machine from section A to section B, and then each hydraulic cylinder device 23 is operated appropriately to reduce the piston rod and move the swinging leg fulcrum 17 in the direction of arrow A. The distance α between the fixed leg 2 and the swinging leg 4 is gradually reduced as the rail span L ₂ is reduced, and each swinging leg 4 is always connected to the rail 8.
Position it directly above. Next, when the work machine enters from section B to section C, each hydraulic cylinder device 23
operation is stopped and the above-mentioned interval α is fixed. Next, in this fixed interval state, the working machine is moved in the direction of arrow E, and dredging work and bank protection work can be performed using the gantry upper loading device 9.

In the above configuration, the interval α in section C is adjusted by measuring the rail span _L2 visually by an employee, and gradually reducing the piston rod of the hydraulic cylinder device 23 by an appropriate length based on the measured value. Alternatively, each traveling device 6 under each swinging leg 4 is provided with a load detector that detects the load applied to each wheel in the directions of arrows A and B, and a bogie section 5 as a fulcrum. The piston rod of each hydraulic cylinder device 23 is gradually reduced by an appropriate length based on the output signals from both the detectors. The interval α may be adjusted.
In addition, the amount of expansion and contraction of the piston rod and the rail span L ₂
This error can be absorbed by swinging the swinging leg 4 in the transverse direction of the rail 8 about the swinging leg fulcrum 17, so that it is possible to operate the cylinder device 23 by visual inspection by an employee. In addition, a lock circuit is provided in the hydraulic piping of each hydraulic cylinder device 23 to prevent the piston rod from expanding or contracting unexpectedly after the piston rod has stopped expanding or contracting.
A clamp device (not shown) may be provided on the swing leg fulcrum 17 to prevent the support shaft 19 from rotating unexpectedly. Further, instead of the hydraulic cylinder device 23, the supporting bearing portion 18 may be slid by a screw shaft, a gear mechanism, a chain, or the like. In the embodiment, the case where the rail span becomes smaller is explained as an example, but if the rail span becomes larger, the piston rod of each hydraulic cylinder device 23 is extended by the procedure opposite to the above. It is sufficient to adjust the interval α. Furthermore, although the explanation has been given using riverbank dredging work as an example, it goes without saying that the method can also be applied to road construction (for example, subway construction) and railway construction.

As described above, according to the gate type work machine of the present invention, a guide along the transverse direction of a predetermined path is provided at the attachment part of at least one leg of the main body, and the machine is slidable along the guide and is axially centered on the lower surface. is provided with a supporting bearing portion in which a recessed portion having a semicircular cross section along the predetermined path is formed, and a convex portion having a semicircular cross section that is fixed to the leg portion and is rotatably fitted into the recessed portion is formed on the upper surface. a support shaft configured to allow the leg to swing in a transverse direction of the predetermined path; a separation prevention plate that fits into projections formed at both ends of the support shaft is provided on the support bearing; Since an actuating device is provided that drives the bearing and moves the leg back and forth along the guide, the movable leg is moved appropriately by the actuating device in response to changes in the width of the path, and each The legs can always be brought into position on the path,
Furthermore, errors in the amount of movement of the legs moved by the actuating device in response to changes in the path width can be absorbed by swinging the legs in the transverse direction of the path.
There is no need to operate a precise actuating device, there is no need to disassemble the working machine as in the conventional method, and the distance between the legs can be adjusted in an extremely short time.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view showing a conventional example. Second
5 to 5 show an embodiment of the present invention, FIG. 2 is a schematic front view, FIG. 3 is an enlarged front view of main parts, FIG. 4 is a view taken along the - arrow in FIG. 3, and FIG. is a schematic plan view. DESCRIPTION OF SYMBOLS 1... Main body, 2... Fixed leg part, 4... Swinging leg part, 6... Traveling device, 8... Rail (predetermined route), 17... Swinging leg fulcrum, 18... Support bearing part, 1
8a... Concave portion, 19... Support shaft, 19a... Convex portion,
19b... Protrusion, 20... Separation prevention plate, 23...
...Hydraulic cylinder device (actuating device).

Claims (1)

[Scope of utility model registration request] It has a main body, legs arranged on both sides of the lower surface of the main body, and a traveling device arranged at the lower end of each leg and placed on a predetermined path, A support that is provided with a guide along the transverse direction of the predetermined path at the attachment part of one of the legs, is slidable along the guide, and has a recessed part with a semicircular cross section whose axis is along the predetermined path on the lower surface. A bearing part is provided, and a bearing part is fixed to the leg part, and a convex part having a semicircular cross section is formed on the upper surface to be rotatably fitted into the recess part, so that the leg part can swing in a direction transverse to the predetermined path. an operation for driving the support shaft and reciprocating the leg along the guide; providing a separation prevention plate on the support shaft bearing that fits into projections formed at both ends of the support shaft; and driving the support shaft and reciprocating the leg along the guide. A gate-type work machine characterized by being equipped with a device.