JPH06129107A - Holding device of shaped steel beam and hydraulic circuit - Google Patents

Abstract

PURPOSE:To arrange H-section steel beams along the inner wall of a tunnel without interference with the wall by holding the beams regardless of the size. CONSTITUTION:A shaft crossing in right angles with the horizontal axis is provided on the swing frame 2 supported so as to freely swing through the horizontal shaft at the front end of the boom of a travelling car to pivotably attach a rotary driving device 4. Since a holding arm 12 which is provided with a curved part 12a bent to opposite sides and opened or closed by a cylinder 14 and further, with which a holding pad 15 gets in contact on closing, is supported rotatably by this rotary driving device 4, not the flanges but the web plate of H-shaped steel beam can be grasped, and hence, it can be easily grasped regardless of the size of shaped steel beam. And when the support frame 9 of holding arm is shaken and rotated, since the holding device 1 can lift the shaped steel beam in the inside of a tunnel, the holding device 1 does not interfere with the inner wall of the tunnel on arranging.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a shape steel beam gripping device, and more particularly, to a shape steel beam arranged vertically and horizontally inside a tunnel for reinforcing the inside of the tunnel during subway construction or the like. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a model steel beam gripping device that can be arranged with high efficiency and its hydraulic circuit.

[0002]

2. Description of the Related Art In subway construction, in order to reinforce a tunnel excavated before finishing a wall surface, a ceiling wall, and a road surface, steel beam beams made of, for example, H-shaped steel are vertically and horizontally arranged at predetermined intervals inside. It forms a frame. For such reinforcement work, for example, a model steel beam handling vehicle equipped with a model steel beam gripping device having a configuration described later is used.
This will be described below with reference to FIG. 7 which is a side view of the model steel beam handling vehicle. The main body of the model steel beam handling vehicle is a crawler-type traveling carriage 50 and a swing frame 51 on which a track frame 51 is swiveled around a vertical axis. And this swivel frame 51
It is equipped with a working arm composed of a boom 52 which is supported up and down freely by an arm, and an arm 53 which is provided at the tip of the boom 52 and is swingably supported around a horizontal axis. It is the composition. The steel beam gripping device 60 is swingably supported by the horizontal shaft 54 at the tip of the arm 53 of the traveling carriage 50.

That is, a swing frame 61 which is swingably supported by a horizontal shaft 54, and a hydraulic pressure which rotates an internal ring gear (not shown) and a pinion which is attached to the swing frame 61 and meshes with the internal ring gear. A rotary drive device 63 including a motor 62, and a rotary cylinder attached to the rotary drive device 63 for rotation, a swing cylinder (not shown) having one end pivotally attached to the rotary drive device 63, swings, and opens and closes. It is composed of gripping arms 65, 65 that are opened and closed by a cylinder 64. This gripping arm 6
5, 65 has one side surface formed in an “L” shape, and the other is formed in a straight shape pivotably attached to the top of the vertical portion of the “L”. As shown in the figure, it is configured so as to have a "U" shape when the shaped steel beam W made of H-shaped steel is gripped. The protrusions of the gripping arms 65, 65 projecting in the opposite directions are disengagement preventing claws that prevent the gripped steel beam W from disengaging.

The usage of the model steel beam handling vehicle equipped with the model steel beam gripping device 60 having the above-described structure will be described below. When the model steel beam W is arranged on the lower surface, as shown in FIG. The shaped steel beam W is gripped horizontally so that the cross section has a “D” shape, the boom 52 and the arm 53 are swung downward, and the upper gripping arm 65 is moved by reducing the rod of the opening / closing cylinder 64. Open it and release the steel mold W,
Further, when the die steel tension W is arranged on the upper side, the boom 52 and the arm 53 are swung upward and the die steel beam gripping device 6 is used.
0 is rocked so that the cross section of the shaped steel beam W has a "V" shape. On the other hand, when the shaped steel beam W is erected, the revolving frame 51 is revolved, and the gripping arms 65 and 65 are moved by 90 by the drive of the hydraulic motor 62 via the rotary drive device 63.
Rotate it once. Then, if necessary, the swing cylinder is operated to adjust the directions of the grip arms 65, 65.

[0005]

When the shaped steel beam is held by the shaped steel beam holding device, the holding arm interferes with
For example, it is not possible to dispose a shaped steel beam in close contact with the inner wall of a tunnel. In addition, naturally, there are several types of dimensions of the shaped steel beam, but if the dimensions are different, it must be replaced with a shaped steel beam gripping device that is suitable for that dimension, which is not preferable for improving work efficiency, and for example, When arranging the shaped steel beam on the ceiling, it is erected on the upper portion of the shaped steel beam erected on both sides of the tunnel and fixed by bolts, but it is difficult to align the bolt holes. Therefore, this model steel beam is slightly rotated by human power in a state where the model steel beam is lifted up.However, since hydraulic oil is filled in the hydraulic motor, a strong force is required to rotate the model steel beam, which is extremely high. The work efficiency is poor.

Of course, if the hydraulic oil in the hydraulic motor is discharged, the shaped steel beam can be lightly rotated by an external force. However, when the rotary drive device is subsequently rotated, the rotary drive device rotates at a high speed, and normal work cannot be performed until the hydraulic motor is filled with the hydraulic oil. Therefore, the hydraulic oil in the hydraulic motor cannot be discharged. . Further, since this type of steel beam gripping device is configured to swing the gripping arm and open and close the gripping arm on the tip side of the rotary drive device, a swivel joint having at least four connection ports is provided in the rotary drive device. It must be provided, and there is a problem not only in its cost but also in its reliability. That is, it is preferable that the number of ports of the swivel joint is small.

Therefore, an object of the present invention is to provide a shaped steel beam gripping device and a method for holding the shaped steel beam, which makes it possible to dispose the shaped steel beam so as to be in close contact with the wall of the underpass with high efficiency. To provide a hydraulic circuit for operation.

[0008]

According to the present invention, if the plate portion of the shaped steel beam is gripped, the shaped steel beam can be arranged in close contact with the wall, and the hydraulic oil in the hydraulic motor is discharged. If the configuration is such that the rotation of the hydraulic motor can be braked when actuated later, the number of rotations until the hydraulic oil is filled in the hydraulic motor can be controlled, and the gripping arm is further swung via the turning device. By doing so, it was made paying attention to the fact that a swivel joint having two hydraulic ports may be provided in the rotary drive device.

The feature of the main means adopted by the model steel beam gripping device according to claim 1 of the present invention is that the swing frame is swingable by a horizontal shaft provided at the tip of the working arm of the traveling vehicle. Is supported by the swing frame and is swingably supported around the axis orthogonal to the horizontal axis and swingable around the axis orthogonal to the axis of rotation, and a grip arm for gripping the shaped steel beam is provided. In a model steel beam gripping device having a gripping arm support frame provided on the opposite support side, the opposite sides of the gripping arms are curved in opposite directions, and a force in a direction orthogonal to the opening / closing direction of these gripping arms acts. At this time, the gripping pad is attached to the gripping arm via a steel beam misalignment preventing mechanism for strengthening the contact force of the gripping pad.

The feature of the main means adopted by the model steel beam gripping device according to claim 2 of the present invention is that the pattern steel beam gripping device according to claim 1 is characterized in that the swing frame includes a rotary drive having a hydraulic motor. The device is swingably supported about an axis orthogonal to the swing support shaft of the swing frame, and one end of a hydraulic cylinder is pivotally mounted between the swing frame and the rotation drive device, and the rotation is performed. The gripping arm support frame is rotatably supported by a drive device about an axis orthogonal to the swing support axis of the swing frame.

The feature of the main means adopted by the model steel beam gripping device according to claim 3 of the present invention is that the braking of the hydraulic motor is released when the hydraulic motor is operating in the model steel beam gripping device of claim 1. The rotary drive device rotates the gripping arm support frame by a hydraulic motor having a brake that brakes the rotation of the hydraulic motor and releases the braking as necessary.

The feature of the main means adopted by the model steel beam gripping device according to claim 4 of the present invention is that the model steel beam gripping device according to claim 1 is characterized in that:
There is provided a rotation transmission device which engages to rotate the gripping arm support frame and which cuts off transmission of rotational force by releasing the engagement.

The features of the main means adopted by the hydraulic circuit of the model steel beam gripping device according to claim 5 of the present invention are as follows:
In the hydraulic circuit of the model steel beam gripping device according to claim 3, a portion including a main hydraulic pipe communicating with two ports of a hydraulic motor capable of freely rotating in the normal and reverse directions via a counter balance valve, and a part including a canter balance valve of these main hydraulic pipes. And a hydraulic motor, respectively, and a hydraulic oil relief pipe in which an opening / closing valve is interposed, and a branch of the main hydraulic pipe from the side opposite to the counterbalance valve connection to the hydraulic motor, and the first shuttle valve. And a bypass pipe communicating with the disengagement side of the brake cylinder via the second shuttle valve and the second shuttle valve interposed in the bypass pipe, and discharged from the hydraulic pump. The hydraulic oil is caused to flow into the disengagement side of the brake cylinder via the second shuttle valve, and the flow of hydraulic oil is stopped, and from the bypass pipe side. Second switching valves for discharging the hydraulic oil through the shuttle valve is in place comprising a working oil supply return pipe formed by interposed.

[0014]

According to the shaped steel beam gripping device of the first aspect of the present invention, the curved plate of the shaped arm can avoid the lateral plate portion of the shaped steel beam, and the gripping pad can grip the plate portion of the shaped steel beam. Further, when the shaped steel beam is horizontally arranged, the gripping arm and the gripping arm support frame prevent the shift, while when the shaped steel beam is erected, a downward force acts.
This downward force strengthens the gripping force of the gripping pad, and thus prevents the shaped steel beam from slipping off.

According to the shape steel beam gripping device of the second aspect of the present invention, since the gripping arm support frame is configured to be supported and rotated by the rotary drive device which is swung by the hydraulic cylinder, the gripping arm supporting frame is structured so as to be rotated. The arm support frame only needs to be provided with a swivel joint having a hydraulic port for supplying / discharging hydraulic oil for opening / closing the gripping arm.

According to the model steel beam gripping device of the third aspect of the present invention, the rotation of the hydraulic motor can be braked by the brake and the braking can be released.

According to the model steel beam gripping device of the fourth aspect of the present invention, the rotation of the hydraulic motor is transmitted to the gripping arm support frame by the engagement of the rotation transmitting device, and the rotation of the hydraulic motor is changed by releasing the engagement. Transmission can be blocked, and the gripping arm support frame can be freely rotated by blocking rotation transmission.

According to the hydraulic circuit of the model steel beam gripping apparatus according to the fifth aspect of the present invention, when the hydraulic motor is driven, the switching valve is closed and the hydraulic oil is not discharged from the bypass pipe side. The hydraulic oil is supplied from the main hydraulic pipe to the hydraulic motor, but in this case, the hydraulic oil is disengaged from the main hydraulic pipe via the bypass pipe, that is, the first shuttle valve and the second shuttle valve. Since it is flowing into the side, the hydraulic motor is driven without receiving a braking force by supplying and discharging hydraulic oil from the main hydraulic pipe. Then, when the drive of the hydraulic motor is stopped and the switching valve is switched, the hydraulic oil flows from the hydraulic pump to the brake disengagement side of the brake cylinder via the second shuttle valve. Continue to be continued. Therefore, when the open / close valve is opened, the hydraulic oil in the hydraulic motor is discharged from the hydraulic oil escape pipe through the open / close valve.

In the case of re-driving the hydraulic motor from which hydraulic oil has been discharged, the switching valve is returned to the original state and the supply of hydraulic oil from the hydraulic pump is cut off, thereby disengaging the brake of the brake cylinder. Since the hydraulic oil is discharged from the side, the hydraulic motor is braked. And the on-off valve is closed,
When hydraulic oil is supplied from the main hydraulic pipe, the hydraulic oil flows into the hydraulic motor, but the hydraulic motor is not driven because it is braked by the brake. On the other hand, the hydraulic oil flows through the bypass pipe, that is, the first shuttle valve and the second shuttle valve. Since the hydraulic oil flows into the disengagement side of the brake, the engagement of the brake is released and the braking of the hydraulic motor is released.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a model steel beam gripping device according to an embodiment of the present invention will be seen from below with reference to FIG. 1 which is a side view of a model steel beam handling vehicle, FIG. 2a which is a side view of the model steel beam gripping device and FIG. 2a. 2b of the drawing, FIG. 3 of the hydraulic circuit diagram of the shaped steel beam gripping device, FIG. 4 of the explanatory diagram of vertically arranging the shaped steel beam, and FIG. 5 of the explanatory diagram of standing up of the shaped steel beam. While explaining.

As in the conventional case, the main body of the steel beam handling vehicle is a crawler type traveling carriage 30, a swivel frame 31 on which a swivel frame 31 is swiveled around a vertical axis, and a swivel frame 31 supports the swivel frame 31 so that the swivel frame 31 can be raised and lowered. Which has a working arm including a boom 32 and an arm 33 swingably supported by a horizontal shaft provided at the tip of the boom 32, and has the same structure as a hydraulic excavator body having a so-called well-known structure. Is.

The arm 33 of the traveling vehicle 30 having the above structure
A model steel beam gripping device 1, which will be described later, is supported by a horizontal shaft 34 provided at the tip end thereof so as to be vertically swingable. That is, by the horizontal shaft 34 provided at the tip of the arm 33, the anti-horizontal shaft 3
The swing frame 2 having a bracket portion protruding in parallel to the fourth side is swingably supported, and a shaft, which is provided on the bracket portion of the swing frame 2 and extends in a direction orthogonal to the horizontal shaft 34, provides a structure described later. The rotary drive device 4 is swingably supported, and the rotary drive device 4 is pivotally mounted at the other end of a swing cylinder 3 which is a hydraulic cylinder having one end side pivotally mounted at the swing frame 2. It is configured to be swung by.

As shown in FIG. 2a, the rotary drive device 4 has a hydraulic bearing 7 having a swivel bearing 5 having an internal ring gear 6, a pinion meshing with the internal ring gear 6, and a brake 8 attached thereto. And the end surface of the internal ring gear 6 is
A gripping arm support frame 9 for supporting a gripping arm, which will be described later, is fixed, and at the center, that is, a position corresponding to the rotation center of the internal ring gear 6, the gripping arm is opened and closed. Swivel joint 10 having two hydraulic ports for supplying and discharging
Is attached. The number of hydraulic ports of the swivel joint 10 is 1 / the number of ports of a conventional swivel joint that supplies and discharges hydraulic oil to and from the open / close cylinder and the swing cylinder.
Since it is 2, the reliability can be further improved.

Further, the gripping arm support frame 9 has a pair of gripping arm support pins 11 arranged in parallel at a predetermined interval and having gripping arms having curved portions 12a curved in opposite directions. 12 are openably and closably supported, and the gripping arms 12 are configured to be opened and closed by expansion and contraction of a piston rod of an opening and closing cylinder 14 pivotally attached to a bracket 12b protruding from the gripping arm 12 through a pin. The piston rod of the opening / closing cylinder 14 is expanded and contracted by supplying / discharging hydraulic oil from two hydraulic ports of the swivel joint 10 via hydraulic hoses (not shown) communicating with the bottom side and the head side, respectively. .

Further, a gripping pad 15 is attached to each of the tips of the gripping arms 12 with which the end faces abut when the gripping arms 12 are closed. As shown in FIG. 2B, the guide pad 13 is fixed to the gripping pad 15 so that the gaps on the opposite sides of the pair of gripping arms 12 are narrow and the gaps on the opposite sides are wide. It is mounted via a sliding frame body 15a having a rectangular cross section, which is externally mounted. The sliding frame 15
A spring mounting bracket is projectingly provided on a, and the guide bar 13 is brought into contact with the stopper by a tension coil spring 16 mounted between the spring mounting bracket and the main body.
It is attached with a tensile force applied to the side with a wide interval.
Therefore, for example, when the shaped steel beam is erected, the weight of the shaped steel beam acts downward, but the gripping pad 15 of the lower gripping arm 12 tries to move to the side where the gap between the guide bars 13 is narrow. The gripping force of 15 is strengthened,
The shaped steel beam can be reliably gripped without being displaced.

On the other hand, the hydraulic circuit 20 for driving the rotary drive device 4 is constructed as shown in FIG. That is,
Counterbalance valve 2 on two ports of hydraulic motor 7
Main hydraulic pipes 21 and 21 communicating with each other via 1a are provided. A throttle valve 22a and an electromagnetic on-off valve 22b, which is an on-off valve that opens and closes by an ON-OFF operation of a switch S, are interposed between the counter balance valve 21a of the main hydraulic lines 21 and 21 and the hydraulic motor 7, respectively. The hydraulic oil escape pipe 22 is branched. In addition, the first shuttle valve 23a and the second shuttle valve 23b from the upstream side of the counter balance valve 21a in the main hydraulic pipes 21 and 21.
A bypass pipe 23 communicates with the brake cylinder 8a, which is attached to the hydraulic motor 7, on the disengagement side of the brake cylinder 8a. Furthermore, this bypass piping 23
Hydraulic fluid supplied from the hydraulic pump P from the second check valve 23b of the brake cylinder 8 via the bypass pipe 23.
an electromagnetic switching valve 24a, which is a switching valve that causes the hydraulic oil to flow into the valve a and is stopped by the ON / OFF operation of the switch S, and discharges the hydraulic oil from the brake cylinder 8a through the bypass pipe 23. The installed hydraulic oil supply return pipe 24 is branched. In this case, 1
With one switch S, the solenoid on-off valve 22b and the solenoid switching valve 24a
Although it is configured to operate and, they may be operated individually, and the throttle valve 22a may be a variable throttle valve. The hydraulic oil tank T is formed by connecting the electromagnetic opening / closing valve 22b of the hydraulic oil supply return pipe 24 and the electromagnetic switching valve 24a side.

Therefore, when the hydraulic motor 7 is in a normal operating state, the first shuttle valve 23a and the second shuttle valve 23b.
The hydraulic oil flowing through the main hydraulic pipes 21 and 21 through the bypass pipe 23 formed by
Since it flows into the disengagement side of the brake of a, the hydraulic motor 7 continues to be driven without being braked by supplying and discharging the hydraulic oil from the main hydraulic pipes 21 and 21. 12 and 12 are rotated normally.

Then, when the supply of hydraulic oil from the main hydraulic pipes 21 and 21 is stopped to stop the rotation of the hydraulic motor 7 and the switch S is turned on, the electromagnetic switching valve 24a.
Is switched and the hydraulic fluid flows into the brake disengagement side of the brake cylinder 8a, so that the hydraulic motor 7 is maintained in the braking released state and the electromagnetic opening / closing valve 22b is also opened. The hydraulic oil in the hydraulic motor 7 is discharged through the escape pipe 22, and the rotary drive device 4 is in a state in which it can be easily rotated by an external force.

When re-driving the hydraulic motor 7 from which hydraulic oil has been discharged, the switch S is first turned off to switch the electromagnetic switching valve 24a and the electromagnetic opening / closing valve 22b to close the main hydraulic piping. Supply and discharge hydraulic oil from 21 and 21. However, the switching of the electromagnetic switching valve 24a causes the hydraulic oil in the brake cylinder 8a to move to the second shuttle valve 2
Since the hydraulic oil is discharged to the hydraulic oil tank T via 3b and the electromagnetic switching valve 24a, the hydraulic motor 7 is continuously braked. When the hydraulic oil is continuously supplied to and discharged from the main hydraulic pipes 21 and 21, and the hydraulic motor 7 is filled with the hydraulic oil, the hydraulic oil flows into the brake cylinder 8a through the bypass pipe line 23, so that the hydraulic pressure is increased. The braking of the motor 7 is released, and the hydraulic motor 7 is configured to be drivable.

The mode of use of the model steel beam handling vehicle equipped with the model steel beam gripping device 1 having the above-mentioned configuration will be described below. When the model steel beam W is arranged below the tunnel,
As shown in FIG. 4, the piston rod of the opening / closing cylinder 14 is contracted to open the gripping arms 12 and 12, and the swinging frame 2 is swung downward to hold the gripping arms 12 and 12.
The rotation drive device 4 is swung so that 12 is on the lower side, the boom 32 is tilted down, and the gripping arms 12 and 12 are closed to grip the plate portion corresponding to the two strokes of the “D” cross section of the shaped steel beam W. At the same time, the boom 32 or the arm 33 is operated and moved. On the other hand, when the gripping arms 12 and 1 are arranged on the upper side, the swing frame 2 is swung upward.
The rotation driving device 4 is swung so that the upper side of the beam is raised, and the boom 32 is raised to move the shaped steel beam W to a predetermined position in a horizontal state and to horizontally bridge the top of the shaped steel beam column in an upright state. At the same time, they are connected by bolts.

In this case, when the shaped steel beam W is arranged on the lower side, the gripping arms 12, 12 are oriented downward, and conversely, when the shaped steel beam W is arranged on the upper side, the gripping arms 12, 12 are oriented upward. In any case, since the model steel beam W is located on the wall side of the model steel beam gripping device 1, the model steel beam gripping device 1 may interfere with the lower surface of the tunnel or the ceiling wall as in the conventional case. In addition, since the plate portion of the shaped steel beam W is gripped, it is possible to easily grip shaped steel beams having different sizes without replacing the shaped steel beam gripping device 1 as in the conventional case. By the way, in order to properly dispose the shaped steel beam W at a predetermined position, the rotary drive device 4 is operated to operate the shaped steel beam W.
It also requires the work of rotating. In particular, a fine operation is required to align the bolt holes during the bolt connecting work.

By the way, it is extremely difficult to align the bolt holes only by operating the model steel beam handling vehicle in the driver's seat. Therefore, an operator or the like who gets on an aerial work platform or the like attempts to rotate the shaped steel beam W by applying a force to the shaped steel beam W, but in the conventional case, the hydraulic motor 7 does not operate within the hydraulic motor 7. Since the oil was full, a strong force was required, which was an extremely difficult work. In this embodiment, when the switch S is turned on, the electromagnetic switching valve 24a operates and the hydraulic oil is transferred to the brake cylinder. 8a flows into the disengagement side of the brake to release the braking, and by opening the electromagnetic opening / closing valve 22b, the hydraulic oil in the hydraulic motor 7 is discharged through the hydraulic oil releasing pipe 22, so that the rotation The drive device 4 can be easily rotated by an external force, and the bolt connecting work can be performed very easily. At the time of proceeding to the next work, the hydraulic motor 7 is braked by the brake 8 until the hydraulic oil is filled in the inside, so that the hydraulic motor 7 does not rotate at high speed at the start of driving and the above-mentioned operation is performed. In addition, the rotation drive device 4 can be easily returned to a state in which it can be normally operated.

Next, the case where the shaped steel beam W is erected will be described with reference to FIG. 5. The piston rod of the opening / closing cylinder 14 is contracted to open the gripping arms 12 and 12, and the swing frame 2 is lowered. By swinging the gripping arms 12 and 12 to the lower side, the rotation driving device 4 is swung and the boom 32 is tilted to close the gripping arms 12 and 12 to close the gripping arms 12 and 12. While holding the plate portion corresponding to the two strokes of the cross section, the boom 32 or the arm 33 is operated to lift the model steel beam W. And the swivel frame 3
1 is rotated and the rotary drive device 4 is rotated to set the shaped steel beam W to the upright state, and the boom 32 or the arm 3 is rotated.
3 is operated to move the shaped steel beam W to a predetermined position and to stand it. Of course, the order of the above operations can be freely changed according to the situation at the work site.

In this case, the shaped steel beam W is composed of the gripping pads 15, 1
Since it is lifted only by the frictional force of 5, the shaped steel beam W may slide downward, which may hinder the work in some cases. However, as described above, when the weight of the shaped steel beam W acts downward, the gripping pads 15 and 15 are
Since the gripping pads 15, 15 of the lower gripping arms 12, 12 try to move to the side of the guide bar 13 where the gap is narrow, the gripping force of the gripping pads 15, 15 is strengthened.
Can be securely gripped and can be installed upright with high efficiency. Moreover, since the shaped steel beam W can be positioned on the side wall side of the shaped steel beam gripping device 1, the shaped steel beam gripping device 1 does not interfere with the side wall.

In the above, by operating the brake 8 and draining the hydraulic oil from the hydraulic motor 7, the gripping arms 12, 1 are released.
Although an example in which an external force is applied to the shaped steel beam W gripped in 2 to rotate it lightly has been described, for example, a clutch such as a hydraulic clutch or an electromagnetic clutch is provided on the output side of the hydraulic motor 7, and these clutches are used. Can easily transmit the rotation of the hydraulic motor 7 to the gripping arm support frame 9 and can disengage the transmission of the rotation of the hydraulic motor 7 by releasing the engagement. Since the hydraulic circuit 20 is not required, only the pipeline and electric wiring for operating the clutch are required, which is effective in simplifying the operation system configuration of the steel beam gripping apparatus 1.

Next, another embodiment according to the present invention will be described with reference to the same parts and those having the same functions as those of the above-mentioned embodiments with the same reference numerals with reference to FIG. 6 which is a side view of a steel beam handling vehicle. As is well understood from the figure, this is different only in the configuration of the main body of the traveling vehicle, and the model steel beam gripping device according to the above-mentioned embodiment has a working arm composed of a boom and an arm. In contrast to being mounted on a vehicle, in the present embodiment, the model steel beam gripping device 1 is mounted on the tip of a multi-step telescopic boom 32 that is undulating and expandable.

Therefore, the multi-stage telescopic boom 32 is swung by the swivel of the swivel frame 31, and the position of the model steel beam gripping device 1 is freely moved by the ups and downs of the multi-stage telescopic boom 32, and the model steel beam gripping device 1 is shaken. Since the gripping arm support frame 9 for moving and supporting the gripping arm 12 can be rotated, this embodiment has the same effect as the above embodiment.

In the above description, the case where the shaped steel beam gripping device grips the shaped steel beam made of H-shaped steel has been described as an example. However, the shaped steel beam is not necessarily made of H-shaped steel and may be, for example, an angle or a channel shape. Some are made of section steel. However, as well understood from the above description, even if the shaped steel beam has an angle or a channel-shaped cross section, these can be freely gripped.

[0039]

As described above in detail, according to the shaped steel beam gripping apparatus and the hydraulic circuit thereof according to the present invention, the shaped steel beam gripping apparatus can be used in accordance with the shaped steel beam different in size as in the conventional shaped steel beam gripping apparatus. Without having to replace the device, it is possible to easily grip the model steel beam with different dimensions and keep the model steel beam gripping device inside the tunnel without any risk of misalignment so that the model steel beam gripping device does not interfere with the wall. In addition, the shape steel beams can be arranged vertically and horizontally in the tunnel, and when connecting the shape steel beams with bolts, the shape steel beams can be easily rotated to align the bolt holes with each other. Although it was necessary to provide the swivel joint with a hydraulic port for supplying / discharging hydraulic oil for swinging and opening / closing the arm, in the present invention, it is necessary to provide the swivel joint with a hydraulic port for swinging the gripping arm. Therefore, it has a great effect on improving the efficiency of the work of arranging the shaped steel beams and the reliability of the shaped steel beam gripping device itself.

[Brief description of drawings]

FIG. 1 is a side view of a model steel beam handling vehicle equipped with a model steel beam gripping device according to an embodiment of the present invention.

2a is a side view of a shaped steel beam gripping device according to an embodiment of the present invention, and FIG. 2b is a view of FIG. 2a seen from below.

FIG. 3 is a hydraulic circuit diagram of a model steel beam gripping device according to an embodiment of the present invention.

FIG. 4 is an explanatory diagram of vertically arranging the shaped steel beams by the shaped steel beam handling vehicle equipped with the shaped steel beam gripping device according to the embodiment of the present invention.

FIG. 5 is an explanatory view of standing up a model steel beam by a model steel beam handling vehicle equipped with a model steel beam gripping device according to an embodiment of the present invention.

FIG. 6 is a side view of a model steel beam handling vehicle according to another embodiment of the present invention.

FIG. 7 is a side view of a model steel beam handling vehicle according to a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Shape steel beam gripping device, 2 ... Oscillating frame, 3 ... Oscillating cylinder, 4 ... Rotation drive device, 5 ... Slewing bearing, 6 ... Internal ring gear, 7 ... Hydraulic motor, 8 ... Brake, 8a ... Brake cylinder, 9 ... Gripping arm support frame, 10 ... Swivel joint, 11 ... Gripping arm support pin, 12 ... Gripping arm, 12a ... Bending portion, 12b ...
Bracket, 13 ... guide bar, 14 ... open / close cylinder,
15 ... Gripping pad, 15a ... Sliding frame, 16 ... Coil spring, 20 ... Hydraulic circuit, 21 ... Main hydraulic piping, 21a ...
Counterbalance valve, 22 ... Hydraulic oil relief pipe, 22
a ... variable throttle valve, 22b ... electromagnetic on-off valve, 23 ... bypass pipe, 23a ... first shuttle valve, 23b ... second shuttle valve, 24 ... hydraulic oil supply return pipe, 24a ... solenoid switching valve,
30 ... Traveling vehicle, 31 ... Revolving frame, 32 ... Boom or multi-stage telescopic boom, 33 ... Arm, 34 ... Horizontal axis, P
... hydraulic pump, S ... switch, T ... hydraulic oil tank, W ...
Shaped steel beam.

Claims (5)

[Claims] 1. A swing frame is swingably supported by a horizontal shaft provided at the tip of an undulating work arm of a traveling vehicle,
The swing frame is supported so as to be rotatable about an axis orthogonal to the horizontal axis and swingable about an axis orthogonal to the axis of rotation, and a gripping arm for gripping the steel beam is supported on the opposite side. In a model steel beam gripping device having a gripping arm support frame provided, when the opposite sides of the gripping arms are curved in opposite directions, and when a force in a direction orthogonal to the opening / closing direction of these gripping arms acts, A model steel beam gripping device, wherein the gripping pad is attached to a gripping arm via a model steel beam displacement prevention mechanism that strengthens the contact force of the gripping pad. 2. A rotary drive device having a hydraulic motor is supported by the swing frame so as to be swingable around an axis perpendicular to the swing support shaft of the swing frame, and the rotary drive is performed together with the swing frame. One end of a hydraulic cylinder is pivotally attached to the device, and the grip drive arm support frame is rotatably supported by the rotation drive device about an axis orthogonal to the swing support axis of the swing frame. The model steel beam gripping device according to claim 1, which is characterized in that. 3. The gripping arm support frame is provided by a hydraulic motor having a brake that releases the braking of the hydraulic motor when the hydraulic motor is in operation, brakes the rotation of the hydraulic motor as necessary, and releases the braking. The model steel beam gripping device according to claim 1, further comprising a rotary drive device for rotating the. 4. A rotation transmission device is provided on the output side of the hydraulic motor for engaging and rotating the gripping arm support frame and for interrupting transmission of rotational force by releasing the engagement. 1. The model steel beam gripping device according to 1. 5. A main hydraulic pipe that communicates with two ports of a forward / reverse rotatable hydraulic motor via a counter balance valve, and a branch from each of the main hydraulic pipe and a portion including a canter balance valve and the hydraulic motor. However, the hydraulic oil relief pipes in which the on-off valves are interposed and the main hydraulic pipes branch off from the side of the counter balance valve that is not connected to the hydraulic motor, and are routed through the first shuttle valve and the second shuttle valve. The bypass pipe that communicates with the disengagement side of the brake cylinder and the second shuttle valve that is interposed in the bypass pipe. The hydraulic oil discharged from the hydraulic pump is connected to the second shuttle valve. Flow into the disengagement side of the brake cylinder and stop the flow of hydraulic oil, and discharge the hydraulic oil from the bypass piping side via the second shuttle valve. 4. A hydraulic circuit for a model steel beam gripping device according to claim 3, wherein the hydraulic circuit comprises a hydraulic oil supply return pipe in which a switching valve for switching is provided.