JPH09194183A - Erection and demolition machine for shape steels - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the erection and demolition machine for shape steels supporting sheathing piles, which facilitates traveling, turning and the control of the position and attitude of a holding device by means of front operations in an underground space narrow and crowded with obstacles, and capable of enhancing working efficiency for erecting each shape steel and demolition. SOLUTION: The erection and demolition machine is equipped with a lower mobile traveling equipment 20, an upper turning equipment 22 to be turned with respect to the lower travelling equipment, a telescopic arm 30 which is provided for the upper turning equipment via a telescopic mast 25, and is disposed in front of the upper turning equipment 22 in such a way that it can be telescopic, and with a holding device 34 which is disposed in front of the telescopic arm 30 for holding shape steels. An oscillating mechanism 37 oscillating the holding device 34 up and down, is provided with a hydraulic cylinder 41 for vertical oscillation, which is housed in the telescopic arm 30, and with a link mechanism connecting the piston rod of the hydraulic cylinder 41 with the holding device 34.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is intended to prevent swelling and collapse of piles for retaining soil such as sheet piles buried in a wall when performing underground construction such as subway construction and construction of a basement floor of a building. The present invention relates to an erection and dismantling machine for erection and dismantling of a section steel that supports a pile by being installed in an excavated underground space.

[0002]

2. Description of the Related Art A subway construction or earth retaining work for building a building foundation or a basement floor will be described with reference to FIG. A pile 1 which constitutes a wall surface for retaining soil such as a sheet pile and columns 3 interspersed in a portion surrounded by the pile 1 are embedded in advance around the area to be excavated, and the portion surrounded by the pile 1 is excavated. Excavate (not shown). On the other hand, the collapse of the wall supported by the pile 1 is prevented as follows. The swelling of the pile 1 due to the earth pressure is prevented by fixing the pile 1 by applying the side surface of the shaped steel 2a such as H-shaped steel to the pile 1. In addition, between the columns 3 and 3, or between the column 3 and the pile 1.
Formed steel 2b is installed between and. At this time, the shape steels 2a, 2
The steel plates 2a and 2b are assembled in a lattice shape by connecting the b parts to each other, and the pile 1 is stretched by the steel mold 2a to prevent the pile 1 from collapsing.

The procedure for constructing the shape steel 2 is as follows. Piles 1 and stanchions 3 are vertically spaced from each other to receive members 4
Are fixed with bolts and nuts. The steel mold 2 is suspended on the bottom surface 6 of the underground space 5 by the above-ground crane 12. The shape steel 2a is gripped by the erection / disassembly machine 7 traveling on the bottom surface 6 and placed on the receiving member 4, and the shape steel 2a is fixed by the bolts and nuts.
Is fixed. Moreover, when soil retention by the pile 1 becomes unnecessary, the shape steels 2a and 2b are disassembled and taken out on the ground. In the conventional erection / disassembly machine 7 for erection and disassembly of such shaped steel, the gripping device 10 is attached to the tip of the arm 9 of the hydraulic excavator 8.

[0004]

Therefore, when adjusting the vertical and front-back positions of the mold steel by the gripping device 10 of the conventional dismantling machine 7, the boom 11 and the arm 9 are rotated to hold the gripping device 1.
0 in the shape of an arc, or by holding the gripping device 10 at the tip of the arm 9.
This is performed by moving the gripping device 10 in an arc shape around the joint portion of the attachment portion for connecting the. Therefore, when the mold steel 2a is placed on the receiving member 4 or is removed at the time of disassembly, the gripping device 10 (that is, the mold steel 2a) is positioned in the up-down direction and the front-rear direction, and the gripping device 10 is retracted or gripped from the mold steel. Is not easy. Therefore, for the work of placing the mold steel 2a on the receiving member 4, the work of releasing the gripping device 10 from the mold steel 2a after mounting, and retreating the gripping device 10, the main body of the hydraulic excavator 8 must be run to move the gripping device 10 horizontally. I don't get. However, when traveling, the height and inclination of the gripping device 10 change as the vehicle travels due to the unevenness of the bottom surface 6, and in order to place the shape steel 2a on the receiving member 4 or retract it, the front (boom 11, boom 11 There is also a problem that it is necessary to control the arm 8 and the gripping device 10), the positioning accuracy of the mold steel 2a is poor, skill is required for the operation, and a great deal of effort is imposed on the driver.

Further, in the conventional dismantling machine, since the arm 9 is attached to the tip of the boom 11 and the gripping device 10 is attached to the tip of the hydraulic excavator 8, the hydraulic excavator 8 is swung upward. Grasping device 10 from the center of body rotation
Has a long working radius to the tip of the robot, and it is difficult to turn and run in the narrow underground space 5 surrounded by the columns 3 and the like, and the joint portion between the boom 11 and the arm 9 has a gripping device. Therefore, when the gripping device 10 is moved closer to the main body of the hydraulic excavator, the base end of the arm 9 is located directly above the dismantling machine 7 as shown by the two-dot chain line.
Therefore, the front operation is difficult, and the work efficiency is low.

The present invention facilitates control of the position and posture of the gripping device by running, turning, and front operation in a narrow underground space with many obstacles, and can improve work efficiency of erection and dismantling of shape steel. An object of the present invention is to provide a steel erection and dismantling machine that supports earth retaining piles.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to FIG. 1 which is an embodiment. A steel erection / disassembling machine according to claim 1 is a self-propelled lower traveling body 20 and this lower traveling body. An upper revolving structure 22 that revolves with respect to 20, a telescopic arm 30 that is provided via a mast 25 that is erected on the upper revolving structure 22 and that extends and contracts in front of the upper revolving structure 22, and is housed in the telescopic arm 30. Telescopic cylinder 33 for telescopically expanding and contracting the telescopic arm 30, a gripping device 34 installed at the tip of the telescopic arm 30 for gripping the shape steel, and a vertical swing cylinder housed in the telescopic arm 30 for vertically swinging the gripping device 34. By including 41, the above-mentioned object is achieved.

A steel erection / disassembling machine according to a second aspect of the present invention is a self-propelled lower traveling body 20, an upper revolving body 22 revolving with respect to the lower traveling body 20, and a mast erected on the upper revolving body 22. A telescopic arm 30 which is provided via 25 and extends and contracts in front of the upper revolving structure 22, an telescopic cylinder 33 which expands and contracts the telescopic arm 30, and a gripping device 34 which is installed at the tip of the telescopic arm 30 and grips the shape steel. The minimum ground clearance of the mast 25 and the telescopic arm 30 is set to the driver's seat 23c.
The above objective is achieved by constructing the roof so that it is equal to or lower than the ground clearance.

It is desirable that the telescopic arm 30 can be elevated and the mast 25 can be telescopically extended. Further, the vertical swinging hydraulic cylinder 41 can be connected to the gripping device 34 via the link mechanism 75.

In the above, the drawings and the reference numerals of the embodiments are used for facilitating the description of the present invention, but the present invention is not limited to the embodiments.

[0011]

1 to 7 are views showing an embodiment of an erection / disassembly machine according to the present invention. This erection dismantling machine uses a hydraulic excavator as a base machine. As shown in FIGS. 1 and 2, the hydraulic excavator main body 23 is
The upper revolving structure 2 is mounted on the lower traveling structure 20 via the revolving device 21.
It is configured by installing 2. Reference numeral 24 denotes a bracket fixedly installed on the upper revolving structure 22, and when used as a hydraulic excavator, the boom and the boom cylinder are connected by a pin, but in the present embodiment, the pin hole of the bracket 24 is used. , Mast 25 is attached by pins 26 and 27 so as to be replaceable with a boom or a boom cylinder.

As shown in FIG. 3, the mast 25 includes an inner cylinder 25a attached to the bracket 24 by pins 26 and 27, and an outer cylinder 25 slidably fitted to the inner cylinder 25a.
b and the inner cylinder 25a, the lower end of the cylinder tube is pinned to the inner cylinder 25a, and the upper end of the piston rod is connected to the outer cylinder 2a.
The mast expanding / contracting hydraulic cylinder 25c attached to the pin 5b is an expandable type.

As shown in FIG. 3, in order to smoothly slide the inner and outer cylinders, for example, hard nylon is provided on the front and rear surfaces of the top of the inner cylinder 25a, the front inner surface and the rear inner surface of the lower portion of the outer cylinder 25b, respectively. Slide plates 70, 71, 7 composed of etc.
2, 73 are mounted, but in this case, the load of the telescopic arm 30, the gripping device 34, and the shape steel 2a is applied to the inner cylinder 2 at the slide plates 71, 72 as indicated by arrows F1, F2.
It acts as a force to bend 5a. In this case, the outer cylinder 25b
By making the lower cut end 25U of the inclined surface with the rear portion upward, the vertical distance h between these can be increased,
Since it is possible to support a large load, the strength is increased, and the stroke of the depression / elevation cylinder 29 can be made large, it is possible to make the depression / elevation angle of the telescopic arm 30 large, and moreover, only by the amount cut diagonally. Can be lightened.

On the top of the mast 25, a telescopic arm 30 is attached by a hydraulic cylinder 29 for elevation and depression so that the extension arm 30 can be raised and lowered about the pin 28a. More specifically, telescopic arm 3
0 is attached to the upper part of the outer cylinder 25b by a pin 28a,
The tube end of the elevation cylinder 29 is attached to the lower portion of the outer cylinder 25b by a pin 28b. Telescopic arm 30 is a mast 2
5, the outer cylinder 32 connected to the pin 5 by a pin 28a, and the outer cylinder 3
It comprises an inner cylinder 31 slidably fitted in 2, and a hydraulic cylinder 33 for expansion and contraction incorporated therein. The base end of the hydraulic cylinder 33 for expansion and contraction is the outer cylinder 32, and the piston rod is the inner cylinder 31.
Connected to each other. The stroke of the telescopic arm 30 is set to be larger than the amount of movement by which the mold steel can be separated from the state where the mold steel is gripped, that is, the width of the mold steel.

A vertical cylinder swinging hydraulic cylinder 41, which will be described later, is housed in the inner cylinder 31 of the telescopic arm 30, its base end is connected to the inner cylinder 31 as shown in FIGS. Is connected to the link 75.

As shown in FIGS. 4 to 6, slide plates 80, 81, 82, 83 made of hard nylon or the like are attached to the upper and lower surfaces and the left and right surfaces of the rear end portion of the inner cylinder 31, and the outer cylinder 32. The upper and lower inner peripheral surfaces and the left and right inner peripheral surfaces of the
Slide plate 84 made of hard nylon,
85, 86, 87 are attached, and the inner cylinder 31 is the outer cylinder 32.
It is designed to slide smoothly against. Further, on the inner peripheral surface of the side wall of the inner cylinder 31, a rib 88 that receives a reaction force at the time of expansion and contraction is formed.
And ribs 89 that receive a reaction force when swinging. Further, a notch 90 as shown is formed at the rear end of the inner cylinder 31. The notch 90 is formed to avoid the hydraulic manifold 33a of the expansion hydraulic cylinder 33 when the inner cylinder 31 is contracted. The manifold 33a connects the pressure oil supply / discharge pipes 33b, 33c, 33d of the expansion hydraulic cylinder 33 in common.

As shown in FIGS. 1 and 2, the gripping device 3 is provided at the tip of the telescopic arm 30, that is, at the tip of the inner cylinder 31.
4 is attached via a vertical swinging device 35, a horizontal swinging device 36, and a turning device 37. The vertical swinging device 35 is connected to the bracket 38 attached to the tip of the inner cylinder 31 of the telescopic arm 30, the bracket 40 attached to the bracket 38 so as to be vertically movable around the pin 39, and the brackets 38 and 40. Link mechanism 75,
It is composed of a vertical swinging hydraulic cylinder 41 mounted between the link mechanism 75 and the inner cylinder 31.

As shown in FIGS. 1, 2 and 7, the left and right swinging device 36 includes a bracket 43 mounted on a bracket 40 so as to be swingable right and left around a pin 42, and these brackets 40, 43. It is composed of a pair of left and right rocking hydraulic cylinders 44 and 45 attached to the left and right. The bracket 43 is rocked to the left and right by extending one of the left and right rocking cylinders 44 and 45 and contracting the other. is there.

The turning device 37, as shown in FIG. 7, has an outer ring 46 attached to the bracket 43 of the left and right swinging device 36.
An inner ring 47 rotatably attached to the inner periphery of the outer ring 46 and having an internal gear, a turning hydraulic motor 48 attached to the bracket 43, and an output shaft of the turning motor 48. It comprises a pinion 49 that meshes with the internal gear, and a revolving frame 50 fixed to the inner ring 47.

As shown in FIGS. 1 and 7, the gripping device 34 has side plates 51 fixedly attached to both sides of the revolving frame 50, and fixing claws 5 attached to the lower portions of the side plates 51, respectively.
2, a movable claw 54 attached to the top of each side plate 51 via a parallel link mechanism 53, and a hydraulic cylinder 62 for opening and closing the movable claw 54. Parallel link mechanism 53
Are links 57 and 58 rotatably attached to the side plates 51 by pins 55 and 56, respectively, and links 57 and 58.
A bracket 61 is rotatably connected to the tip of 58 by pins 59 and 60 and is integral with the movable claw 54, and the line connecting the pins 55, 56, 59 and 60 forms a parallelogram. The opening / closing hydraulic cylinder 62 is provided between the rearward extending portion of the link 57 and the revolving frame 50.

A procedure for erection of the section steel using this erection dismantling machine will be described. Since the above-mentioned crane 12 shown in FIG. 13 holds the steel pattern that has been hung on the bottom surface 6 of the underground space 5, the erection dismantling machine is run and turned. The shape steel can be gripped as follows. Mast 2
When the expansion / contraction of No. 5 is not used, the expansion / contraction arm 30 is obliquely lifted by the elevation cylinder 29 while the mast 25 is contracted, as shown by the chain double-dashed line in FIG. And the movable claw 54 is opened by contracting the opening / closing cylinder 62.
Furthermore, the direction of the pawls 52, 54 is adjusted to the direction of the mold steel 2a by the turning motor 48, and the elevation cylinder 29 is contracted, so that the central portion of the mold steel 2a is fixed to the fixed pawl 52 and the movable pawl 5.
4 and the opening / closing cylinder 62 is extended to form the shape steel 2
Grab a between the claws 52 and 54. Next, the elevation cylinder 29 is extended, the vertical swing cylinder 41 is extended, and the mold steel 2a is lifted.

When the expansion and contraction of the mast 25 is used, the lifting cylinder 29 and the vertical swing cylinder 41 are adjusted with the mast 25 extended as shown by the chain double-dashed line in FIG. In addition, the opening / closing cylinder 62 is contracted to open the movable claw 54. Further, the direction of the pawls 52, 54 is adjusted by the turning motor 48 to the direction of the mold steel 2a, and the mast telescopic cylinder 25c is contracted so that the central portion of the mold steel 2a is sandwiched between the fixed pawl 52 and the movable pawl 54.
The open / close cylinder 62 is extended to fix the shape steel 2a to the claws 52, 54.
Grab in between.

Next, the mast telescopic cylinder 25c is extended to cut the die steel 2a from the ground, and the vertical rocking cylinder 41 is extended to lift the die steel 2a to an appropriate position. FIG. 10 is a perspective view showing a state in which the shape steel is gripped by the gripping device 34.
Further, the turning device 21, the swinging device, is swung so that the shape steel 2a travels to a position where it should be installed, and the height, front and rear, and left and right positions of the shape steel 2a are approximately located on the receiving member 4 and can be adjacent to the existing shape steel 2a. Device 35, 36 or telescopic cylinder 25
By operating c, the telescopic cylinder 33 is extended and the shaped steel 2a is placed on the receiving member 4 as shown in FIG.

The plan view of FIG. 11 shows the shape steel 2a along the pile 1.
An example is shown in which the symbol is applied. As in this example, one of the left and right vibrating cylinders 44 and 45 is extended and at the same time the other is contracted in accordance with the angle formed by the direction of the telescopic arm 30 and the arrangement direction of the piles 1, so that the telescopic arm 3 is expanded.
The orientation of the gripping device 34 with respect to 0, that is, the angle of the mold steel 2a is adjusted. Further, the shape steel 2a is made horizontal by the turning motor 48 of the turning device 37, and then the telescopic arm 30 is extended to position the shape steel 2a on the plurality of receiving members 4. Next, lift cylinder 29 or mast telescopic cylinder 25c
The mold steel 2a is placed on the receiving member 4 by contracting and slightly lowering the tip of the telescopic arm 30. After the shaped steel 2a is placed on the receiving member 4, the movable claw 54 of the gripping device 34 is opened by contraction of the opening / closing cylinder 62, and then the telescopic arm 30 is contracted. As a result, the gripping device 34 can be retracted from the mold steel 2a without running the main body. The shaped steel 2a is fixed to the receiving member 4 with bolts and nuts.

The procedure for disassembling the shaped steel 2a is as follows. With the movable claw 54 of the gripping device 34 opened, the gripping device 34 is directed toward the center of the mold steel 2a, and the telescopic arm 30 is moved.
And extending the shape steel 2a with the gripping device 34
Position between 4 After the open / close cylinder 62 is extended to grip the model steel 2a with the claws 52 and 54, the bolts and nuts that fix the model steel 2a to the receiving member 4 of the pile 1 or the pillar 3 are unfastened. Then, the elevation cylinder 29 or the mast telescopic cylinder 25c is slightly extended to lift the mold steel 2a,
The telescopic cylinder 33 is contracted to contract the telescopic arm 30,
After traveling and turning to a predetermined position, the vertical rocking cylinder 41 is contracted to make the gripping device 34 downward, and the elevation cylinder 29 is contracted to lower the steel mold 2a onto the bottom surface 6.

When the inner cylinder 31 of the telescopic arm 30 is contracted, the manifold 33a is housed in the notch 90. The advantages of such a cutout 90 are as follows. When the cutout 90 is not provided, the position of the rear end face is reference numeral 90a in FIG. 4 so that the manifold 33a does not interfere with the rear end of the inner cylinder 31, and when the cutout 90 is provided, the reference numeral 9 in FIG.
The position is 0b. Slide plates 80 and 81 are provided on the upper and lower surfaces of the rear end portion of the inner cylinder 31, and slide plates 84 and 85 are provided on the upper and lower inner peripheral surfaces of the distal end portion of the outer cylinder 32 to facilitate the expansion and contraction operation of the expansion and contraction arm 30. ing. The longer the distance between the slide plates 80 and 85, the inner cylinder 32 and the outer cylinder 3
Since the strength of 1 is advantageous, the gap between the slide plates 80 and 85 can be widened by providing the notch 90.

In the above-described embodiment, since the expansion and contraction amount of the expansion and contraction arm 30 is at least long enough to grasp and release the shape steel 2a, the mast 25,
Telescopic arm 30, swinging devices 35, 36, turning device 3
7. The length of the front composed of the gripping device 34, strictly speaking, the length of the front of the upper revolving structure 22 projecting forward can be made shorter than that of the conventional front, and the telescopic cylinder 33 is contracted to contract the telescopic arm 30. Since it is further shortened in the open state, the stability of the dismantling machine is improved, and traveling and turning can be easily performed without being disturbed by the support columns 3 and the like.

Further, since the working radius is short, heavier die steel can be handled. Further, in the front use of the hydraulic excavator shown in FIG. 13, the joint between the boom 11 and the arm 9 is higher than the gripping device 10, but when the telescopic arm 30 is horizontal, The height and the height of the telescopic arm 30 are almost the same, and the height of the front when the reaching height of the gripping device is made approximately the same can be made lower than before, and the shape steel 2a on the dismantling machine is There is no concern that the telescopic arm 30 will collide. Furthermore, in the present invention, even though the front length is shortened, when the telescopic arm 30 is obliquely lifted, the gripping device 34 becomes higher than the telescopic arm 30, so that the gripping device 34 reaches. The height is not lower than the conventional one. Moreover, since the mast 25 is telescopic, it is possible to work at a higher position.

Further, when the mold steel 2a is placed on or removed from the receiving member 4, the mold steel 2a is sandwiched by the gripping device 10 or the gripping device 10 is retracted, the telescopic arm 30 is linearly expanded or contracted. These operations can be performed with simple operations, and the positioning accuracy is better than when traveling or turning, and since it can be performed without traveling or turning, operation is simple and high skill is not required. , You can work efficiently.

Furthermore, since the maximum height position of the gripping device 10 is raised by the extension operation of the telescopic mast 25, the total height can be lowered by retracting the telescopic mast 25, and the stability during traveling and turning is further increased. There is little risk of supporting the running and turning motions. Further, the height of the telescopic arm 30 can be changed when the shaped steel 2a is erected and dismantled, and the upper and lower working range can be expanded. Further, as shown in FIG.
When gripping the claws 52, 54, the grip device 34 is positioned right above the steel mold 2a and the mast 25 is contracted.
The mold steel 2a can be easily sandwiched between the two and the gripping work becomes easy. Furthermore, since the height of the gripping device 34 can be changed while keeping the retractable arm 30 in a horizontal position, when the mold steel 2a is placed on the receiving member 4, the mast 25 is contracted to vertically move the mold steel 2a. Can be set easily with good position accuracy.

Further, the swinging hydraulic cylinder 41 is attached to the inner cylinder 3
Since the hydraulic cylinder 41 is housed in the first cylinder, there is no risk of the hydraulic cylinder 41 colliding with the shape steel and being damaged. The piston rod of the swinging hydraulic cylinder 41 is gripped by the link mechanism 75.
By connecting to 4, the swing angle for the stroke amount of the hydraulic cylinder can be made large, and a hydraulic cylinder with a shorter stroke can be used compared to the case where no link mechanism is used, and weight and cost can be reduced. Becomes

FIG. 12 shows a posture in which the telescopic mast 25 is most retracted and the telescopic arm 30 is rotated to the lowest position. In addition to the top of the mast 25 being substantially equal to or lower than the top of the roof of the driver's seat 23c, the rear of the outer cylinder 32 of the telescopic arm 30 when the telescopic arm 30 is lowered as shown in FIG. The end corner 32a is also lower than the roof of the driver's seat 23c. Therefore, at a site where the maximum ground clearance is low, the minimum ground clearance of the erection dismantling machine is regulated by the height of the roof of the driver's seat by contracting the telescopic mast 25, so that work can be performed with peace of mind.

[0033]

According to the dismantling machine according to the present invention, when the mold steel is erected or dismantled, the telescopic arm is expanded and contracted to adjust the gripping position and the release position of the mold steel. Since the size can be reduced and the vertical swinging cylinder is also housed in the telescopic arm, it is possible to prevent the vertical swinging cylinder from being damaged due to collision of die steel or the like. Further, according to the erection dismantling machine of the present invention, since the minimum ground height of the erection dismantling machine is defined by the roof of the driver's seat, the mobility on site where the ground height is low is improved. Furthermore, if the mast is a telescopic type, the height position of the shape steel can be adjusted without horizontal movement, improving operability and reducing the dimension in the height direction.
It is possible to handle the section steel at the same working height as in the past. Furthermore, if a link mechanism is used for the vertical swinging mechanism, the vertical swinging angle can be increased, and the swinging angle of the arm telescopic cylinder can be small.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a dismantling machine according to the present invention.

FIG. 2 is a plan view of the dismantling machine according to the embodiment of FIG.

FIG. 3 is a diagram showing a telescopic mast of the erection dismantling machine of the embodiment of FIG.

FIG. 4 is a view showing a telescopic arm of the erection dismantling machine of the embodiment of FIG.

5 is a view as seen from the line vv in FIG. 4. FIG.

6 is a diagram viewed from the line vi-vi in FIG. 4.

FIG. 7 is a partial cross-sectional side view of the gripping device of the erection dismantling machine of the embodiment of FIG.

8 is a side view for explaining the operation of gripping the mold steel by the erection dismantling machine of the embodiment of FIG. 1. FIG.

FIG. 9 is a side view for explaining the operation of gripping the mold steel by expanding and contracting the mast.

FIG. 10 is a perspective view showing a state in which the mold steel is gripped by the gripping device of the erection dismantling machine of the embodiment of FIG.

11 is a plan view for explaining the direction adjusting operation of the mold steel of the gripping device of the erection dismantling machine of the embodiment of FIG. 1. FIG.

FIG. 12 is a side view of the erection dismantling machine in a state in which the telescopic mast is contracted and the telescopic arm is moved downward.

FIG. 13 is a diagram illustrating a working state of a conventional dismantling machine.

[Explanation of symbols]

 1 Pile 2 Steel 3 Support 4 Supporting member 20 Lower traveling body 21 Revolving device 22 Upper revolving structure 23 Main body 23C Operator's cab 25 Mast 25a Inner cylinder 25b Outer cylinder 25c Mast expansion hydraulic cylinder 29 Depression cylinder 30 Telescopic arm 31 Inner cylinder 32 Outer Cylinder 34 Gripping device 35 Vertical swinging device 36 Horizontal swinging device 37 Swinging device 41 Vertical swinging hydraulic cylinders 44, 45 Horizontal swinging cylinder 52 Fixed claw 54 Movable claw 62 Opening / closing cylinder 75 Link mechanism

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Seiichi Someno 2-6-2 Otemachi, Chiyoda-ku, Tokyo NITORI CONSTRUCTION MACHINERY CO., LTD. (72) Inventor Akio Iwasaki 2-6-2 Otemachi, Chiyoda-ku, Tokyo No. Nitto Construction Machinery Co., Ltd. (72) Inventor Toshiyuki Kosaka 2-6-2 Otemachi, Chiyoda-ku, Tokyo Nitto Construction Machinery Co., Ltd.

Claims (5)

[Claims] 1. A self-propelled undercarriage, an upper revolving structure for revolving with respect to the lower revolving structure, and a telescopic member provided in front of the upper revolving structure through a mast standing on the upper revolving structure. A telescopic arm, a telescopic cylinder housed in the telescopic arm to telescope the telescopic arm, a gripping device installed at the tip of the telescopic arm for gripping the shape steel, and a telescopic arm housed in the telescopic arm to hold the gripping device. An erection and dismantling machine for a section steel, comprising a vertical swing cylinder for vertically swinging. 2. A self-propelled undercarriage, an upper revolving structure that revolves with respect to the lower revolving structure, and a telescopic member provided in front of the upper revolving structure through a mast standing on the upper revolving structure. And a telescopic cylinder that telescopes the telescopic arm, and a gripping device that is installed at the tip of the telescopic arm to grip the section steel, and the minimum ground clearance of the mast and the telescopic arm is the ground clearance of the driver's seat roof. An erection and dismantling machine for shaped steel, characterized by being configured to be equal to or lower than. 3. The dismantling machine according to claim 1 or 2, wherein the telescopic arm is capable of being lowered. 4. The erection dismantling machine according to claim 1, wherein the mast is capable of expanding and contracting. 5. The erection dismantling machine according to claim 1, wherein the vertical swinging hydraulic cylinder is connected to the gripping device through a link mechanism.