KR19980036861A - Inner working platform of lower working platform - Google Patents

Abstract

The present invention moves freely along the bridge in the lower portion of the main girder type bridge in which wings are formed on the side and inner wings are formed on the inner side, such as a PC (prestressed concrete) bridge or a steel box beam bridge. While working, the lower part of the mold is aligned across the orthogonal direction, and when the span is moved, it is provided with a lower work platform that is separated from side to side and rotates to the outside of the pier so as not to interfere with the pier. It relates to an inner working platform placed on the lower surface working cart to be carried out.

In order to construct the inner working platform for the inner wing which is to be installed on the lower working platform of the double row mold bridge, when used, the inner working platform should be protruded to a height high enough to work the lower surface of the inner wing above the lower working platform. In addition, when the span is moved, it is required to be positioned below the bottom surface member of the mold in order to rotate the lower workbench.

The present invention is a pair of horizontal workbench symmetrical type installed above the lower workbench on both sides from the lower side of the inner wing of the two molds, and the lower workbench so as not to interfere with the lower surface member of the mold when moving the pair of horizontal workbench, respectively. When lowered to the upper surface of the use, the height of the variable hydraulic drive type lifting device to raise the arbitrary working height from the lower workbench to be close to the lower end of the inner blade, and the folding fence on the three sides of the pair of horizontal workbench It is composed of the inner workbench provided, satisfying the characteristics of the inner workbench for the double row mold bridge, and is easy to work and use, easy to operate, and high quality bottom running type bridge that can secure the strong support structure and safety. It is characterized by providing the inner working platform of the lower working platform.

Description

Inner working platform of lower working platform

1 is a front configuration diagram of an example of a lower-side running type bridge lower surface work cart according to an embodiment in which the present invention is installed in an example two-row mold PC bridge.

2 is a rotational state diagram when the work cart of FIG. 1 configuration is moved to the next span.

3 is a side view of an example of a traveling device in the configuration of FIG.

4 is a side configuration diagram of the upper and lower position alignment device of the traveling device of the configuration of FIG.

5 is an example of a drive system of the traveling device in the configuration of FIG.

6 is a cross-sectional view of the rail fixing structure of the traveling device in the configuration of FIG.

7 is an enlarged view of one embodiment of the rotary support device implemented in the configuration of FIG.

8 is a cross-sectional view of main parts of an embodiment of the rotary support device implemented in the first configuration

9 is a plan view of the rotary drive device of the embodiment of the rotary support device implemented in FIG.

10 is a side view of an embodiment of the inner working platform configuration according to the present invention

11 is a lower state diagram of the inner working platform according to the configuration of FIG.

12 is a cross-sectional view taken along the line A-A of the configuration of FIG.

FIG. 13 is a folded state of the folding fence as seen in the cross section of FIG.

14 is an overall configuration diagram of a work cart having a variable rotation support device is implemented another embodiment of the present invention

15 is a schematic diagram of the lifting device of the rotary support device during the construction of the work cart of FIG.

16 is an enlarged view of one side of a variable rotation support apparatus according to another embodiment of the present invention.

17 is an enlarged view of the use state and configuration of the working bench of another embodiment of the present invention

18 is an enlarged view of the lowering state of the inner working platform of another embodiment of the present invention

19 is a state of use of the work cart having a variable rotation support device is implemented another embodiment of the present invention

* Description of the symbols for the main parts of the drawings *

S1, S2: Main girder of PC (prestressed concrete) bridge

S1x, S2x: Combination type 2 row molds with height difference on side members within one span

Sa, Sc: Outer wing of left and right mold Sb, Sc: Inner wing of left and right mold

Se: Outer side member of left and right mold Sf: Inner side member of left and right mold

Sg: Lower surface members Pr1 and Pr2 of left and right molds: Left and right piers

Ap: Road paving unit 10: left and right traveling device

111: rail holder 11a: holder of another embodiment

112: fixing bolt for fixing stand 114: fixing bolt for rail

12, 12a: Rail 121: Lower wing of rail

14: driving wheel 15: idle wheel

16: Wheel Bracket 17: Driving Motor

20: left and right outside workbench 22: upper frame

23, 24: front and rear vertical frame 25: horizontal working board

26: vertical frame 27: lower position alignment device

271: Flow bracket for lower alignment wheel 272: Lower alignment wheel

273: Hydraulic cylinder of lower flow bracket 28: Upper position alignment device

282: upper alignment wheel 281: floating bracket of the upper alignment wheel

283: hydraulic cylinder of the upper alignment bracket 30: left and right rotation support device

31: vertical support member 32: cylindrical tube

33: Turn flange 35, 35a: Drive bracket

36: Pivot hinge of the lower platform 37: Turntable

30a: variable rotary support device

31a: Vertical support member of the variable rotation support device

40: left and right rotary support device 41, 41a: rotary hydraulic cylinder

42, 42a: Cylinder rod 43: Thrust bearing member

44: shaft 45: hydraulic cylinder

45a: Cylinder rod 46a, 46: Upper and lower horizontal shaft

462, 461: upper and lower pulleys 47: movable pulley

48: hydraulic device unit 49: horizontal adjustment hydraulic cylinder

W1, W2: Pulley drive wire 50, 51: Left and right lower workbench

55, 55a: guide rail 53: upper member of the lower workbench

54: hinge 60: tip coupling device

70: inner working platform 71 of one embodiment: lifting device of the inner working table 70

711, 712: inside and outside lifting platform of the inner working platform 70, 713, 714: hinge

715, 716: roller 717: shaft pin

718: Hydraulic cylinder 719: Connecting rod

72: horizontal work bench 721: guide rail

73: Folding fence 731: Hinge

732: fence connector 74: stair member

741: hinge 742: stair fence

743: hydraulic cylinder

70a: Other Embodiments of the Present Invention High-elevation Deformable Inner Working Platform

71a: High lifting type lifting device

711a, 712a, 711b, 712b: upper and lower lift platforms

713a, 714a: hinge 715a, 716a: roller

717a: shaft pin 718a: hydraulic cylinder

72a: high elevating horizontal work platform 721a: guide rail

73a: fence 731a: hinge

90: ladder structure

91: counterweight of left and right lower workbench

96: power trolley bar 97: power trolley hanger

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner side workbench installed on a lower workbench in a bridge underbody work cart for various operations performed on a lower surface of a bridge at the time of construction or completion of various bridges.

In the construction of various bridges, there are various tasks performed on the underside of the bridge at the time of construction or after completion. Particularly, in the case of bridges that continuously assemble a unit length of a certain length such as PC (prestressed concrete) bridges and steel box beam bridges, or construct one span as an integral main girder, There are quite a lot of tasks such as assembly surface processing, epoxy treatment, painting work, shoe inspection, shoe replacement work, mold bottom surface inspection, inspection and repair.

However, PC bridges and forced box beam bridges do not have any structure other than bridges on the lower side of the bridge, so a work platform is required to perform the above-described bridge underside work. In the state where the in-mold mold is installed in the pier, the self-propelled workbench freely supported along the bridge while being installed in the orthogonal direction of the lower side of the mold, the bridge working platform for performing the bridge underside work as described above After the completion of the bridge, the bridge is provided for use as a permanent work platform for performing maintenance work and inspection work.

The bridge undercarriage type is based on the configuration of the moving device, and supports the entire surface of the trolley at the top of both sides of the mold and the top of the cantilever. There is a bottom running type that drives while driving, and each type has a traveling device that moves the entire work cart along the bridge in common, and an outside work that supports the entire work cart by hanging down on the travel device, and this outside A support device for supporting the lower workbench on the workbench, and is supported by the support device in the form of a cantilever truss, which is located across the lower part of the mold in the orthogonal direction when working, and is separated from the left or right when passing through the piers or one of the rotating shafts. Basically, it is equipped with a lower work platform that rotates without passing through the piers.

Bridge lower surface work cart formed with the basic components as described above, depending on the configuration of each of the components of the overall work cart production, work characteristics are determined.

In particular, in a bridge formed with a wider bridge and constructed with two or more rows of double molds, the function and manufacturing characteristics of the entire work platform depend on the construction of the work bench.

Among the characteristics of the workbench required for bridges constructed with double-row molds, what is required as a property of the workbench is that an inner workbench for the bottom surfaces of the inner wings of both molds, which are the boundary between the double-row molds, and the inner surface members is provided. to be.

According to the construction of a conventional work cart, work on the mold outer wing parts and the outer surface members of the bridge is carried out at the left and right outer workbench, and the work on the lower surface members of each of the double row molds is installed across the lower side of the molds. It can be carried out in the lower workbench, but the inner blades and the inner surface members of the two molds located at the boundary between the double-row molds are located very high to work on the lower workbench, so that the lower work is difficult. Inner working platform is required.

However, the inner working platform for working the lower surface of the inner blades and the inner side members of the double-row mold should be installed on the lower working platform due to the construction of the working cart, but the lower working platform inside the lower working platform due to the structural characteristics of the lower running platform. It is difficult to install a workbench.

The lower workbench is supported by cantilever type in the supporting device installed in the vertical direction on the outer workbench, and when working, it should be fixedly aligned across the lower part of the double-row mold and move through the piers when moving to the other span. After passing through the piers by falling out of the piers by 90 degrees from the underside of the outside mold or by rotating the device 90 degrees to the outside of the piers, they are again fixed in the transverse direction to the underside of the recuperative molds in working condition. It is accompanied by the structural and operating characteristics, so that the installation of the inner working platform in consideration of the positional characteristics, simply formed by protruding and fixed to the central side member of the lower workbench below the inner wing of the double-row mold, the work cart as described above Lower workbench separated left and right for piling movement This is because, when rotating, the protruding inner working platform is caught by the inner surface member of the mold, so that rotation is impossible and thus the span movement operation cannot be performed.

In particular, in recent years, it is common that the length of one bridge is very long as well as the entire length. In view of the structural characteristics of the bridge that the length is longer, the height of the mold is considerably increased in the center span or the edge span. Also, even in one span, the height of the mold is low on the center side and high on the pier side, and in order to build a wide bridge, the bridge which is formed in two or more rows of double molds in order to build a wider bridge, There was considerable difficulty in installing an inner working platform that could universally accommodate the same structural characteristics of the bridge.

An object of the present invention is the inner working platform for the inner blade portion required for the lower working platform for the double row cast bridge, the height of the side member of the mold when the working platform does not interfere with the rotational operation of the lower working platform. It is to provide a height-variable inner working platform that can vary the height according to the stretch.

Another object is to provide a high quality inner working platform that can ensure a strong support structure and safety if it is easy to manufacture and use and its operation control is easy.

The configuration of the present invention for achieving the above object is a configuration of the inner working platform which is attached to the lower work bench for double row mold type bridge lower surface working platform, the upper side of the lower working platform which is separated from left and right on the lower side of the inner wing of both molds. A pair of horizontal workbenches each installed on the left and right sides of the pair of horizontal workbench X-shaped to support the front end of both lower workbench in a variable way to lower or unalign the lower surface member of the mold without interference It is characterized by comprising a left and right hydraulic drive type elevating device composed of a lifting operation member and a hydraulic cylinder for folding these lifting operation members, and a folding fence on the three sides of the horizontal working platform.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a front configuration diagram of an example of a lower surface driving bridge undercarriage applied to an example two-column PC bridge, and FIG. 2 is a diagram showing the lower side work benches of both sides for moving the work carriage of FIG. 1 to the next span. It is a front view of the state which rotated.

In the embodiment configuration, the symbols S1 and S2 represent two rows of left and right molds constituting the PC bridge of one example in cross section, and Sa and Sd respectively denote outer wing portions of the left and right molds S1 and S2. Sb and Sc denote the inner blade portions of the left and right molds S1 and S2, respectively, Se denotes the outer side members of the left and right molds S1 and S2, and Sf denotes the left and right molds S1 and S2. The inner surface member is displayed, Sg is the lower surface member of the left and right molds S1 and S2, respectively, Pr1 and Pr2 are the piers supporting the mold, and Ap is the road surface.

The construction of the bridge bottom surface work cart of the lower surface driving type of the example applied to the PC bridge of the above example configuration is formed as a device of left and right symmetry around the boundary portion (coupling portion) of the left and right molds S1 and S2. The front and rear ends of the lower workbench are separated and combined at the boundary.

In an important configuration, the left and right traveling apparatuses 10 which move the entire work cart on the lower ends of the outer blade portions Sa and Sd of the left and right molds S1 and S2, respectively, and move freely along the bridge, Each of the left and right traveling devices 10 is placed on the upper end to suspend the whole work cart in suspension, and the rotary bearing members are vertically downward from one side of each of the left and right outside work platforms 20. The left and right rotation support device 30 and the left and right rotation support device 30 having a lower worktable bearing member for pivotally installing the left and right lower worktables 50 and 51 at the bottom thereof, respectively, at the bottom thereof. And left and right rotation driving devices 40 installed between the upper end of each of the upper and left and right outer working tables 20 to rotate the left and right rotation support devices 30 at arbitrary rotation angles, respectively, and the left and right rotation support devices 30. )field Is at the bottom by the bearing member is the outer side consists of a cantilevered pivot in the suspension above the opening cross-section is a square truss member right and left lower work surface 50, 51 in the vertical flow type.

If one example as described above, the left and right traveling device 10, the left and right outer working platform 20, the left and right rotating support devices 30, the left and right rotation driving device 40, which are the main components of the running bridge lower surface work cart For example, the left and right lower work benches 50 and 51 are each installed in a left-right symmetrical manner.

As shown in the third, fifth, and sixth configurations of the traveling device 10, rails fixedly arranged in the longitudinal direction at the lower ends of the outer wings Sa and Sd of the left and right molds S1 and S2, respectively, 12) and several driving wheels 14 and idle wheels 15 mounted on the upper surface of both sides of the lower blade 121 of the rail 12 on the same rotational axis, and sliding, the driving wheel 14 and idle wheels. The front and rear wheel brackets 16 respectively bearing the front and rear sides of the wheel brackets 16 at predetermined intervals, and the reduction gear-integrated drive motor 17 fixed to one side of the wheel brackets 16 to drive the driving wheels 14. ).

The outer working platform 20 is configured as shown in 3rd, 4th, 5th to 7th, etc., the driving wheel 14, the idle wheel 15 and the driving motor 17 of the traveling device 10. It is supported by the upper frame 22 for supporting the front and rear wheel brackets 16, the vertical frame 23, 24 for supporting the upper frame 22, and the vertical frame 23, 24 The horizontal working plate 25 installed at regular intervals with the lower surface of the outer blade portion Sa (Sd) of the two-row mold (S1) (S2) is used as a base frame, and the lower position alignment is performed on the lower inner side and the upper outer side, respectively. A device 27 and an upper position alignment device 28 are provided to be symmetrically mounted to each outer surface member Se under the outer wing portions Sa and Sd of the left and right molds S1 and S2. It is a configuration.

The lower position alignment device 27 installed on each of the left and right outer work platforms 20 has a flow bracket 271 freely installed at the front and rear of the inner end of each of the horizontal work plates 25, and this flow bracket ( At the outer side of the lower end of 271, the lower alignment wheel 272 is idled so as to be rotated in the longitudinal direction of the mold S1 and S2, and the flow bracket 271 has a hydraulic pressure between the lower end and the inner lower end of the horizontal working plate 25. The cylinder 273 is installed, and the lower end of the flow bracket 271 is rotated by the hydraulic cylinder 273 to the lower side of the outer surface member Se of the left and right molds S1 and S2 to be press-fitted. The left and right lower work benches 50 and 51 are fixed at the position, or at the time of moving the span, the left and right outer work benches 20 are prevented from being inclined toward the outer surface member Se of the mold to align horizontally.

The upper position alignment device 28 respectively installed on the left and right outer working platform 20, the height of the hydraulic cylinders 283, respectively, on the upper outside of the front and rear vertical frames 26 installed on the outer upper surface of the horizontal working plate 25. Is installed, and the flow bracket 281 is installed in the flow bracket 281, the upper alignment wheel 282 is idlely laid so as to rotate in the longitudinal direction of the mold (S1) (S2), respectively, the position of the lower workbench to be described later By operating the hydraulic cylinder 283 at the time of fixation or span movement, the front and rear upper alignment wheels 282 are pressed against the lower surface of the outer blade portion Sa (Sd) of the molds S1 and S2, respectively. The left and right outer working platform 20 is arranged to maintain the horizontal to prevent the inclination of the left and right molds, respectively.

As shown in FIGS. 7, 8, 9, etc., the rotation support device 30 has a rotation bearing member vertically downward from the inner side of the horizontal working plate 25 provided on each of the left and right outer working materials 20. It has a vertical support member 31, which is freely installed and rotates freely, is installed between the upper end of the vertical support member 31 and the horizontal working plate 25 to rotate the vertical support member 31 at an arbitrary rotation angle. The rotary drive device 40 and the lower workbench bearing member for pivoting the left and right lower workbenches 50 and 51 at the lower end of the vertical support member 31 are pivoted up and down, respectively.

The vertical support member 31 is a truss member of the lower end of the rectangular cross-sectional shape, the upper end is composed of a cylindrical tube 32 having a turn flange 33 on the outer periphery, the top of the turn flange 33 Left and right driving brackets (35) (35a) having a connection hole located on the left and right center line extension line of the clearance (32) is spoken, and the lower work platform for pivoting the left and right lower working tables (50) and 51 at the lower end of the lower truss member Pivot hinge 36 is provided.

The configuration of the rotary drive device 40 for rotationally driving at a predetermined angle while supporting the vertical support member 31 having the above-described configuration on the left and right outer working tables 20 freely rotates, respectively. A turntable 44 fixedly installed on an inner side of the horizontal working plate 25 and having a thrust bearing member 43 for freely arranging the turn flange 33 on an upper surface thereof so as to freely rotate the cylindrical tube 32 freely. And the cylinder rods 42 and 42a are connected to the left and right driving brackets 35 and 35a of the cylindrical tube 32, respectively, and the bodies are respectively fixed to the outer side of each of the left and right outer working platforms 20. It consists of a pair of rotary hydraulic cylinders 41 and 41a.

As shown in the first, second, and seventh degrees, the configuration of the left and right lower work benches 50 and 51 is a rectangular truss member having an upper opening, and the outer end portions of the left and right sides are vertical support members 31 respectively. At the bottom of the field, the pivot hinge 36 is arranged up and down in flow, and the tip portions are installed in a configuration that is separated by the tip coupling device 60 at the boundary of the two-row mold (S1) (S2), respectively, left and right sides Horizontally adjustable hydraulic cylinders 49 are respectively provided between the upper outer side of the vertical support member 31 and the outer upper ends of the left and right lower work platforms 50 and 51 of the vertical support member 31, and each of the left and lower lower work tables 50 and 51 is provided with a lower tip end. Tension bars 93 are installed in the front and rear, respectively, between the lower and rear end.

The left and right lower work benches 50 and 51 of such a configuration are integrally coupled to the front end coupling device 60 with the front end portions of the left and right truss members so as to be positioned across the lower side of the left and right molds S1 and S2 in an orthogonal direction during operation. Assembled by, and when passing through the left and right piers (Pr1) (Pr2) to move the span separated the left and right truss members of the left and right, the left and right rotation support devices 30 for supporting the respective left and right truss members The truss members are rotated 90 degrees so as not to interfere with both piers Pr1 and Pr2 by rotating by 90 degrees with the rotary drive devices 40.

In the drawing, reference numeral 48 denotes a hydraulic unit installed on the upper outer side of the lower left and right lower working platforms 50 and 51 for operating the hydraulic cylinders installed in the entire work cart, and the reference numeral 90 denotes the road surface Ap on the bridge. Ladder structure is installed across the left and right outer working platform 20 side, reference numeral 91 is a counterweight of the lower left and right working platform 50, 51, 96 is a power supply for supplying power to the drive motor 17 and all the electric power mechanism 97 is a power trolley hanger, 111 is a fixing stand of the rail 12, 112 is a fixing bolt for fixing the fixing stand 111 to the outer wing portion Sa (Sd) of the mold S1 (S2). Will be shown respectively.

One embodiment of the present invention carried out on one example of the lower surface running bridge lower surface work cart of the configuration as described above is the left and right inner working platform 70 which is installed symmetrically above the front end of both lower working platform 50, 51, respectively. It consists of.

Referring to the configuration of the left and right inner working platform 70 on the basis of one configuration installed on one side lower working table 50 as shown in FIG. 10, 11 and 12, 13 degrees, as follows.

The basic configuration of the inner working platform 70 includes a hydraulically driven lifting device 71 provided at the upper end of the lower worktable 50, a horizontal working platform 72 supported at the upper end of the lifting device 71, and The folding fence 73 is arranged on the three sides of the horizontal work surface 72, and the support angle adjustable stair member 74 is installed on one side of the horizontal work surface 72.

The elevating device 71 is a hydraulically driven lifting operation member capable of varying the support height while supporting the horizontal working table 72 at the upper end of the lower working table 50. 50) A pair is installed symmetrically on both front and rear sides between the upper ends.

Detailed configuration of the lower roller is fixed to the hinge 713 fixed to the upper end of the upper end member 53 of the lower work platform 50, the upper end of the roller 715 on the guide rail 721 of the lower left of the horizontal work platform (72) And the upper side is fluidly fixed to the hinge 714 fixed to the lower right side of the horizontal work platform 72 so as to intersect the outer platform 711 and the inside in X-shape from the inside. Has an inner platform 712 which is installed in the guide rail 55 installed on the upper member 53 of the lower work bench 50 by the roller 716 so that the inner and outer platforms 711, 712 intersect. The part is freely laid freely by the shaft pins 717, between the front and rear rollers 715 and the front and rear rollers 716 are provided with angular reinforcement rods 719, and between the upper and rear shaft pins 717 between the front and rear inner platform 711. The upper and lower reinforcement bars 7 are respectively provided between the lower sides of the front and rear outer platform 712. 19a) 719b are installed and connected to the hydraulic unit 48 between the upper and lower reinforcing rods 719a and 719b by the hydraulic control circuit 48 mounted on the outer side of the lower work platform 50, respectively. It is a configuration in which two hydraulic cylinders 718 which are controlled to operate in the same stroke are interlocked.

The configuration of the horizontal work bench 72 horizontally installed above the lower work benches 50 and 51 by the elevating device 71 is almost equal to the width of the inner blade portion Sb of the one-side mold S1. It is formed in a rectangular shape having a length of the same size and the width of the size of the front end portion truss member of the lower work bench 50, 51, the hinge, 731 on the front, rear, and right end except for the left side, respectively. Foldable fences of a certain height that can be freely laid freely, each fence (73) in the standing state is connected to each other and supported by the connector 732 at the corners between each other, the horizontal workbench 72 to be described later At the time of descent, in a state where the connector 732 is removed, the hinge 731 is bent by 180 degrees with respect to its outer side downward as shown in FIG.

The staircase member 74 is to perform the function of the stairs used by the operator when the horizontal worktop 72 is raised from the upper end of the lower worktop 50, and the overall work on the inner surface member of the mold (S1) As a support angle adjustable ladder type member to perform the function of the workbench, the upper end is freely constructed by the hinge 741 at the left end of the horizontal workbench 72 and the lower end is formed as a free end of the lower workbench 50 It is formed to a width enough to enter the inside of the left and right truss member from the upper end, and a fence 742 of a predetermined width on both sides above the outer side, the support angle adjustment hydraulic pressure between the upper inside and the lower end of the horizontal work platform (72) The cylinder 743 is provided.

In the state where the step member 74 of such a configuration raises the horizontal work bench 72 and is aligned in the working state, the hydraulic cylinder 743 is operated to incline the lower end of the step member 74 outward to incline the operator. While making it easy to move up and down on the horizontal workbench 72, on the one hand, it is possible to easily carry out work on the inner surface member Sf of the left and right molds. As shown in FIG. 5, the step member 74 is lowered in the lower working platform 50 during the lifting operation of the horizontal working platform 72 by removing the working hydraulic pressure of the hydraulic cylinder 743 and positioning the hydraulic cylinder in a vertical state by its own weight. It is controlled so as not to interfere with the lifting operation of the horizontal worktable 72 by allowing the left and right truss members inside and out to interfere with the lower truss member.

One embodiment of the inner working table 70 of the present invention as described above is installed on the left and right lower working tables 50, 51 in a left and right large bar, respectively, a horizontal working table installed on each of the left and right inner working tables 70 ( The lifting operation of 72 is performed by separately controlling the left and right sides, and at the same time by interlocking control of the two front and rear hydraulic cylinders 718 installed in the lifting device 71 at the same time.

Ascending stroke to raise the horizontal working platform 72 of the left and right inner working platform 70 to the working height is carried out by supplying the hydraulic pressure to the front and rear hydraulic cylinders 718 installed in each lifting device (71).

When a certain amount of hydraulic pressure is supplied to the front and rear hydraulic cylinders 718 from the hydraulic unit 48, the working rods protrude, and the cylinder bodies are supported by the lower reinforcing rods 719b installed between the outer platforms 711. Lifting the upper reinforcing rods (719a) supported by the operating rods to open the front and rear each of the inner and outer lifting platforms (711, 712) up and down.

At this time, the outer platform 711 is fixed to the lower side of the lower work surface upper surface member 53 by the hinge 713, so that the upper roller 715 slides the lower guide rail 721 of the horizontal work platform 72 Since the upper platform is fixedly arranged on the lower end of the horizontal work platform 72 by the hinge 714, the lower roller 716 has the upper member (the lower work platform 50, 51). 53, the guide rail 55 is erected while sliding above, and as shown in FIG. 10, the horizontal work bench 72 is raised to a certain height while maintaining the horizontal.

The lower stroke lowering the horizontal work platform 72 which has been raised by such a stroke, first, the front, rear, and right sides of the fence 73, which are erected on the horizontal work platform 72, are removed by connecting the connectors 732, respectively, and folded downward. Then, the hydraulic pressure of the hydraulic cylinder 743 holding the staircase member 74 inclined is removed and made vertical, and the hydraulic pressure supplied to the hydraulic cylinders 718 of the elevating device 71 is removed.

When the hydraulic pressure supplied to the lifting hydraulic cylinder 718 is removed, the working rod that supports the lifting platforms 711 and 712 in the open state is introduced into the horizontal work platform 72 by the load, so that the lifting platforms 711 and 712 are loaded. ) Are gradually folded by folding each of the hinges 713 and 714, as shown in FIG. 11, so that the upper end of the horizontal work bench 72 does not interfere with the lower surface member Sa of the left and right molds. (50) It is to be seated down close to the upper surface of the (51).

One embodiment of the inner working table 70 of the present invention having the above configuration is installed on the left and right lower working tables 50, 51 in a symmetrical manner, respectively, the effect of the above-described bridge lower surface work cart It is explained with the effect as follows.

The working state of the lower surface running bridge lower surface work cart of the above example is the work cart alignment operation for the work of the bridge bottom surface in one span, the work cart movement operation in one span and the work cart to the other span. Operate by dividing by moving operation state.

First, the work cart alignment operation for the work if the bridge in one span, the left and right traveling device 10 on the rail 12 installed on the outer blade portion Sa (Sd) of the left and right molds in one span as shown in FIG. Drive wheels 14 are fixed by controlling the driving motor 17 in a stationary state in the state of installing the wheels, and the respective inner working platforms 70 installed on the upper and lower ends of the left and right lower work benches 50 and 51 are mounted. As described above, in the downward stroke, the respective fences 73 are folded outward and downward, and after the stair member 74 is erected vertically, the respective lifting devices 71 are operated to control and lower the horizontal work platforms 72. In the state, the vertical support members 31 of the left and right rotation supporting apparatuses 30 are positioned so that their front end portions abut the left and right lower working tables 50 and 51 so as to cross the lower side of the mold S1 and S2 in the orthogonal direction. The left and right rotary drive device 40 is rotated by operating control.

The left and right lower work benches 50 and 51 are respectively positioned so that their front end portions are in contact with each other in a direction orthogonal to the lower side of the mold S1 and S2, and the front end coupling device 60 installed at both front end portions which are in contact with each other integrally. In combination, the lower work benches 50 and 51 are aligned to one horizontal structure.

When both lower work benches 50 and 51 are fixedly arranged in one structure, the work height set by operating the hydraulic cylinder 718 with the upward stroke as described above, the horizontal work benches 72 of the left and right inner working tables 70 are operated. Raise to.

When the horizontal work benches 72 of the left and right inner working platform 70 are raised to the set working height, the three-sided fence 73 provided on the side of each horizontal working platform 72 is set up above the horizontal working platform 72 to each other. After fixing by connecting to the connector 732, the staircase members 74 provided in each of the hydraulic cylinders 743 are also operated to control the spread out to the set inclination angle to the outside.

When the operation as described above is completed, the left and right outer working platform 20 of the work cart is aligned below the outer wing portion (Sa) (Sd) of the both side mold (S1) (S2), the left and right lower working platform (50) (51). ) Are aligned below the lower surface members Sg of the left and right molds, and the left and right inner working platforms 70 are arranged below the inner wings Sb and Sc of both molds S1 and S2. As shown in FIG. 1, the work cart alignment operation is completed, which forms a work platform capable of working on the entire lower surface of both sides S1 and S2 as a whole.

When the work cart alignment operation is completed, the whole work cart travels along the entire lower surface of the work span by the work cart moving operation of rotating the driving wheels 14 of both traveling devices 10 to the driving motor 17. While doing the bottom surface work can be done.

When the lower surface work in one span is completed by the work balance alignment operation and the moving operation in the one span as described above, the whole work cart should be moved to the other span for the lower surface work in the other span. The movement of the whole to another span is carried out as follows.

In order to move the whole work cart to the other span, the lower work benches 50 and 51 fixedly aligned in a structure across the lower surface members Sg of both molds S1 and S2 divide the span. It must be rotated to the outside of both piers so as not to interfere with the two piers Pr1 and Pr2.

In order to rotate both lower work benches 50 and 51 to the outside of both side piers Pr1 and Pr2, first, the raised left and right inner work platforms 70 are operated and controlled in the downstroke as described above. As shown in the drawing, the horizontal work benches 72 are lowered so that the upper members 53 of the lower work benches 50 and 51 are close to each other, and the upper and lower position alignment devices 27 and 28 installed on each of the left and right outer work platforms 20. These parts are press-contacted to the outer blade portion Sa (Sd) and the outer surface member Se of the molds S1 and S2, respectively, to stably align the left and right outer working platforms 20.

When the inner working platform 70 of the left and right are lowered, the left and right lower working tables 50 and 51 are separated from the left and right structures by releasing the front end coupling device 60 of the coupling unit.

The separate left and right lower work benches 50 and 51 are shown in FIGS. 8, 9 and the like, with the vertical support parts 31 serving as the supporting apparatuses, respectively, as the axis of rotation of the bearing pipe 44 of the left and right outer work benches 20. By operating and controlling the rotary hydraulic cylinders 41 and 41a of the left and right rotary drive device 40 to a rotational position, as shown in FIG. 2, they do not interfere with the piers Pr1 and Pr2 to pass through. Rotate 90 degrees in each direction.

When the rotational operation of the lower work platform 50, 51 is based on the left rotary drive device 40, as shown in detail in FIG. 9, the cylinder rod 42 of the front rotary hydraulic cylinder 41 is sufficient. In the protruding state, the cylinder rod 42a of the rear rotating hydraulic cylinder 41a is fully pulled so that the driving brackets 35 and 35a of the cylindrical tube 32 are positioned on the centerline of the lower work platform 50. In the engaged position positioned at an angle, the front rotary hydraulic cylinder 41 pulls the cylinder rod 42, and the rear rotary hydraulic cylinder 41a is operated to push the cylinder rod 42a to operate. When the cylindrical tube 32 is rotated 90 degrees clockwise at the position, the tip portion of the lower left work platform 50 supported by the vertical support member 31 is also rotated 90 degrees to the rear side.

In the same way, when the opposite right lower platform 51 also rotates the front end 90 degrees to the rear side only by changing the operating direction of the rotary hydraulic cylinders 41 and 41a, the left and lower lower platform 50 as shown in FIG. (51) are parallel to each other outward so as not to interfere with the left and right piers (Pr1) (Pr2) to pass through.

After completion of the rotation of the left and right lower work platform 50, 51 as described above, the left and right lower position alignment device 27 and the lower position alignment device 28 of each of the left and right lower wing of the mold (S1) (S2) ( When the driving motor 17 of the left and right traveling apparatus 10 is separately or sequentially moved to the next span side in the state of being pressed against Sa (Sd) and the outer side surface member Se, both sides of the outer working platform 20 ) And both lower working platform 50, 51 can be moved to the next span respectively.

After the two outer working tables 20 and the lower working tables 50 and 51 as described above are sufficiently moved in the new span by the span movement operation, respectively, the rotary hydraulic cylinders 41 and 41a of the respective left and right rotary drive devices. Position control in the opposite direction to the opening rotation control, and rotates the open left and right lower work benches 50 and 51 to the center side, which is the boundary side of both molds S1 and S2, in alignment again. When the tip parts are integrally coupled using the tip coupling device 60, the left and right lower work benches 50 and 51 are fixedly aligned in a structure across the lower side of the molds S1 and S2 in an orthogonal direction. .

As described above, while both sides of the lower work platform 50, 51 of the work cart is fixed and rearranged as a structure across the lower direction of the periphery (S1) (S2) orthogonally in the moved range, as described above When the horizontal working platform 72 of the inner working platform 70 is operated in the upward stroke to raise to the working position, and the respective three-sided fence 73 is upright and fixed, and the step member 74 is inclined to position control as shown in FIG. It is then aligned with the overall bottom work cart.

Thus, according to the configuration of the inner working platform 70 of the present invention, according to the operation characteristics of the elevating device 71, the left and right horizontal working platform as the operation control of the right and left front and rear hydraulic cylinders 718, respectively, up and down stroke, The upper end of the lower working platform 50, 51 so as not to interfere with the lower end member (Sg) of the two sides (S1) (S2), or to raise and lower the variable to any height in close proximity to the inner blade portion. It can be lowered on the surface and used for double row mold bridges where the height difference of the lower part of the mold is relatively small over the entire bridge. Structural characteristics of the inner working platform for the wing can be satisfied, and in particular, the installation height of the horizontal working platform 72 can be arbitrarily adjusted within the lifting width of the elevating device 71, so that the entire bridge length Even if there is some difference in height between the lower members of the mold, it has the general purpose to accommodate it, and the lifting operation control of the horizontal work table 72 is very simple and easy, and has a stable control characteristic with little defects such as inoperability, and the horizontal work table. Since 72 can be fixed and aligned at any time without any fixing means in a stable position at all times, it ensures the safety of the operator during the bottom surface work.

The above-described embodiment of the inner working table 70 of the present invention has a narrow width in which the applied bridge is a double row mold and the height of the outer surface member (lower member) of the mold is the same within one span, or over the entire bridge. It can be effectively applied to the type having the height difference. In order to form the entire length of the bridge and to build the length of one span, the height of the lower member of the mold in the center span of the bridge The lower member of the mold in the lower side and the edge side is formed to be high, or even within one span, the height of the lower member of the mold is formed to be lower on both sides of the mold and higher on both sides of the pier. The work trolley in which the height of the main vertical support member 31 of the apparatus 30 is fixedly accommodated when the height difference of the lower member of the mold is considerable. It should be formed with a height enough to be able to be formed, there is a possibility that various problems occur in production or use.

Therefore, to solve this problem, a work cart having a height-variable rotary support device that can adjust the height of the lower workbench in response to a change in the height of the lower member of the mold in one bridge is disclosed in the applicant's prior application.

The work cart having such a height-variable rotary support device can arbitrarily adjust the height of the lower workbench, so that even if the height of the lower member of the mold is changed within one span, it is easy to cope with the lower part of the mold within the span. When the difference in height of the member is remarkable, the height difference of the inner blade is also remarkably formed. Therefore, the inner working platform 70 of the embodiment described above has a variable width of the lifting height of at least the height difference of the inner wing of the lower working table. The problem is not applicable to the bridge formed by the expected.

Therefore, in another preferred embodiment for implementing the present invention, a high lift variable for the work cart having a height-variable rotary support device that can adjust the height of the lower workbench in response to the change in the height of the lower member of the mold. Type inner working platform is provided.

14 is a configuration diagram of a lower surface running bridge lower surface work cart having a height-variable rotational support means of an example in which the high-elevation variable inner working platform is another embodiment of the present invention.

The construction of the lower surface traveling bridge lower surface work cart provided with the height-variable rotational support means supports the left and right lower work benches 50 and 51 as compared to the work cart configuration having the fixed rotation support device of the above-described example. It is characterized by the configuration of a variable that can be adjusted arbitrarily the height.

The height-variable rotational support means is composed of a height-variable rotational support device 30a as shown in FIG. 16, and the rotational drive device 40 of the upper part which is a bearing means and a rotation means with the outer worktable 20 is the work. It is provided in the same manner as the stationary rotary support device of the example, the vertical support member 31a is formed in a rectangular cylinder shape, the length is formed longer than the fixed type to accommodate the height of the mold, left and right lower work platform (50) The member for bearing 51 is composed of a bearing 44 which is fitted into a rectangular cylinder on the outer surface of the vertical support member 31a and lifts up and down. The front end portion is coupled to the hinge 54 in front and rear so that the front end portion flows up and down, and the bearing 44 is lifted by a lifting device installed inside the vertical support member 31a.

As shown in FIGS. 14, 15, and 16 degrees, the lifting device configuration of the bearing 44 is fluidly fixed above the inside of the vertical support member 31a so that its operation rod 45a is fixed. Idle construction of several downward pulleys 461 at regular intervals on the hydraulic cylinder 45 which goes down and the lower horizontal shaft rod 46 fixedly installed on the horizontal line on the rod 45a of the hydraulic cylinder 45 At the fixed end side height of the cylinder body, the upper horizontal shaft rod 46a is fixedly laid in parallel with the lower horizontal shaft rod 46 to raise several upper pulleys 462, and the upper sides of the shaft 44 Each of the movable pulleys 47 is fixedly installed, and as shown in FIG. 15, two inner wires W1 and W2 wound around the pulleys are respectively provided with the inner free end of the lower horizontal shaft bar 46. After fixing to the upper end, the upper pulley 462 arranged on the upper horizontal shaft rod 46a primarily After walking down to the inner side in the middle of the lower horizontal shaft rod 46, the lower pulley 461 is arranged in a way to walk on the inner side, the whole of the pulleys to walk annually and finally the upper end of both sides of the sink 44 It is composed of a shortened lifting device applying a multi-pulse device that is wound on the moving pulleys 47 installed on the upper side and fixed to the outer end of the upper horizontal shaft bar 46a.

According to the above-described lifting device configuration, as shown in FIG. 15A, when the hydraulic cylinder 45 is operated to push the rod 45a downward, the movable pulleys 47 fixedly arranged on both sides of the bearing 44 are upward. In conclusion, the bearing 44 is lifted on the outer surface of the long vertical support member 31a to operate as an upward stroke to raise the left and right lower work platforms 50 and 51, and conversely, FIG. B) As the hydraulic cylinder 45 is operated to pull the rod 45a, the movable pulley 47 acts to descend, consequently the outer surface of the vertical support member 31a, in which the bearing 44 located above is long. Lower the left and right will be operated as a downstroke that will lower the left and right lower working platform (50) (51).

According to the configuration of the rotary support device 30a according to this embodiment, as shown in FIGS. 14 and 16, the height of the side member, which is the lower member of the molds S1 and S2, is high on the pier side and gradually toward the center side, even in one span. Even when applied to bridges that have complex molds (S1x) (S2x), which have a lower height and have different heights, or molds with a large difference in height of the lower members being merged by one span, a single work cart for all sections of the bridge Even if only a bay is installed, the height of the left and right lower work benches 50 and 51 is adjusted to an appropriate height, and even if the lower member of the mold has a considerable height difference, it is accommodated so as to be close to the lower surface member Sg of the mold for easy work. It has a general purpose that can be implemented.

In the construction of the work cart having the height-variable rotary support device 30a having the above-described configuration, the work on the bottom surface member Sg of the complex two-row mold S1x and S2x having a large height difference arbitrarily has a height. The lower worktable (50) (51) can be easily operated by the variable, but the inner blade portion for the lower worktable (50) (51) according to the height change of the lower surface member (Sg) of the mold ( Sb) Since the height of the (Sc) is also largely changed, the configuration of the inner working platform for the inner blade portions (Sb) (Sc) of the left and right molds having such a large height difference also raises and lowers the height substantially. It is essential to have means to vary.

14 and 16, 17, 18, and 19 are shown the configuration and operating state of the high elevating variable inner working platform 70a of another embodiment of the present invention having these characteristics.

This configuration is the lower lifting platform 711a (712a) of the elevating operating members of the high elevating elevating device (71a) for elevating the high elevating horizontal working platform (72a) compared to the configuration of the inner working table 70 in the embodiment of the present invention described above The upper and lower symmetric type lifting platform (711b) (712b) at the top of the) is characterized by increasing the lifting width of the lifting platform of the horizontal work platform (72a) to the high lifting type.

Another embodiment of the high-elevation inner working platform 70a of the present invention will be described with reference to one side configuration shown in FIGS. 16, 17, and 18 as follows.

The configuration of the high elevating horizontal working platform (72a) is the same in that it has a folding fence (73a), guide rails (721a), hinges (714a) at the three side sides, respectively, for the high elevating horizontal working platform (72a) The step member, which is the lifting means of the worker, may be laid in the same manner as the step 74 of the above embodiment, but the weight is increased due to the large lifting height, and it may be omitted due to the fear of interference with the lower work platform during the lifting operation. It is composed.

The configuration of the high elevating type elevating device 71a for elevating the high elevating type horizontal work bench 72a is a hydraulic drive capable of varying the support height thereof while supporting the high elevating type horizontal working table 72a on the upper end of the lower working table 50. In terms of the elevating operation member is the same as the technical configuration of the inner working platform 70 of one embodiment.

However, this configuration uses the lower lifting platform 711a, 712a, which is the same member as the lifting platform 711, 712 of the elevating operation members of one embodiment, the lower end of one side lower platform 711a is the lower working platform 50 (51a) is installed on the guide rail 55a fixedly installed at a position downwardly inward from the upper end of the 51, and the other lower lifting platform 712a is a shaft pin 717a and the lower lifting platform 711a. After the lower end is slidably installed on the guide rail 55a with the roller 716a in the state of being cross-installed in the X-shape, the lower platforms 711a and 712a are provided at the upper ends of both lower platforms 711a and 712a. A pair of upper platform 711b, 712b of the same standard as the up and down symmetrical expansion to form a Jabara type linked at the same time, and the upper side of the extended one of the upper platform 711b is roller 715a guide rails (721a) ) And the upper end of the other upper platform 712b is hinged (714a) The configuration in each installed in lift type horizontal work surface (72a).

In the above-described configuration, the fixed position of the guide rails 55a for supporting the lower lift tables 711a and 712a is high and horizontal lifting platform when folding the upper and lower lift tables 711a, 712a, 711b and 712b. It is contemplated that 72a can be sufficiently seated in close proximity to the top member 53 of the lower platform 50, 51.

This configuration is the hydraulic cylinder 718a, which is the driving means of the upper and lower lifting tables 711a, 712a, 711b, 712b, has a lifting width corresponding to the maximum height of the inner elevating horizontal work platform 72a. By adopting a standard having an operation stroke of a degree that can be, the same as the technical configuration of the inner working platform 70 of one embodiment is configured to constitute a high elevating type elevating device (71a).

The high elevating inner working platform as described above (70a) is installed on the left and right lower working tables 50, 51, respectively, symmetrical bar, the left and right hydraulic by the operating characteristics of the high elevating type lifting device 71a formed of a two-stage elevating member As the operation of the cylinder 718a is controlled by lifting and lowering, respectively, the high elevating horizontal work benches 72a can be raised and lowered by varying the height to the high elevating type.

That is, when the horizontal work platform 72a is to be lowered for the rotation operation of the lower work benches 50 and 51 for the span movement of the work cart, the hydraulic cylinder 718a is removed to operate and be controlled to the lower stroke. The upper and lower lifting platforms 711a, 712a, 711b, 712b are simultaneously folded downwards so that the high lifting horizontal work 72a does not interfere with the bottom surface of the compound two-row mold S1x S2x. It can be lowered close to the upper surface of the lower working platform (50) (51), and the high elevating horizontal working platform (72a), which is lowered, for the lower surface work within a span as shown in 14, 19 degrees When the 72a is to be raised close to the lower end surface of the inner blade parts Sb and Sc of the left and right molds, it is interlocked with the lower lift tables 711a and 712a which are erected by supplying hydraulic pressure to the hydraulic cylinder 718a. The lifting platform (711b) (712b) is also built in the lifting stroke For example, the high elevating horizontal working platform 72a is raised to an arbitrary height capable of working on the lower end surface of the inner blade portions Sb and Sc of the left and right molds of the complex two-row mold S1x and S2x. It can be arranged in a fixed position without fixing means.

Another embodiment of the present invention according to the configuration of the high elevating inner working platform (70a) is applied to the configuration of the work cart having a height-variable rotary support device (30a), composite type 2 having a large height difference within one span or by span In the lower surface work of the bridge constructed by the thermal molds S1x and S2x, the inner side of the lower work benches 50 and 51 that vary in a large width in proportion to the height change of the lower surface member Sg of the mold. Corresponding to the height change of the wings (Sb) (Sc), the inner working platform (70a) can be aligned to the right position at all times while always changing the height of the inner working table 70a over a large width, so that the inner blade and the inner surface of the member It is possible to ensure the safety of the operator as much as possible to facilitate the operation of the lower surface, and the lifting operation control is very easy as the above-mentioned large lifting height operation can be easily performed by the operation control of the hydraulic cylinder 718a.One having a sharp characteristic.

As described above, the present invention considerably improves the production and operation characteristics of the work cart, and further enhances the haptic working environment and efficiency of the bridge in constructing the work surface of the lower surface driving type bridge under the work surface. It has the advantage of greatly improving product competitiveness as it can be improved.

In the practice of the present invention as described above, the configuration of the above-described embodiments is presented as a preferred embodiment for carrying out the present invention, but is not necessarily limited thereto.

For example, all hydraulic cylinders provided on the inner working platform can obtain the same working characteristics by changing the installation position according to the manufacturing characteristics or the product characteristics, and the configuration of the respective folding fences provided at the three side sides of the horizontal working tables. In addition to the folding means for flipping the hinge 180 degrees on the axis below the horizontal workbench, the same effect can be obtained even if the fences on each side are used as a means for folding the top of the horizontal workbench.

Claims (3)

In the lower part of the main girder type bridge where the wing is formed on the side and the inner wing is formed on the inner side, such as PC (prestressed concrete) bridge or steel box beam bridge, Has a lower work platform which is arranged in the orthogonal direction of the lower side of the mold and is separated from left and right when passing through the bridge and rotates to the outside of the bridge so as not to interfere with the bridge. As the inner workbench configuration attached to the lower workbench of the lower workbench, Left and right symmetrical pairs of horizontal workbenches respectively installed above both lower workbenches separated left and right from the lower side of the inner wing of both molds, and the pair of horizontal workbenches respectively do not interfere with the lower surface members of the molds. A hydraulic drive type consisting of an X-shaped elevating actuating member for lowering the surface or raising and arranging at an arbitrary working height with respect to the inner blade part, and supporting an X-shaped elevating actuating member for supporting at the distal end of both lower work platforms and a hydraulic cylinder for folding these elevating actuating members. An inner working platform of a lower surface running bridge lower surface working cart, comprising: a lifting device and a folding fence on three sides of the pair of horizontal working tables. The structure of claim 1, wherein the inner working platform has a rectangular shape, and a support angle adjustable stair member 74 is installed on one side, and the lower three sides are hinged 731, respectively, and the lower end of each of the three side ends is connected to the connector 732. A horizontal work bench 72 provided with folding fences 73 which can be erected or folded to be folded outward, It is installed symmetrically in the front and rear between each of the horizontal working platform 72 and both lower lower working tables 50, 51 while supporting the horizontal working platform 72 on the upper end of the left and right lower working tables 50, 51, respectively. A hydraulically driven lifting and lowering device capable of varying the support height, the lower end of which is fixed to the front end of the upper member 53 of the lower workbench by a hinge 713 and the upper end of the lower guide rail 721 of the horizontal workbench 72. The outer platform 711 is installed in the roller 715 to be gliding, and the upper and lower symmetrical form that crosses the outer platform 711 in an X-shape, the upper end is a hinge 714 on the lower right of the horizontal work platform 72 It is fixed by the fluid and the upper end is provided with an inner platform 712 which is installed to slide in the roller 716 to the guide rail 55 installed on the upper member 53 of the lower work platform, the inner and outer platform 711, 712 The intermediate intersection of the two flows freely with the shaft pin 717 The hydraulic cylinders 718 are installed in front and rear by installing upper and lower reinforcing rods 719a and 719b in one side portion of the inner and outer lifting platforms 711 and 712 and installing the hydraulic cylinders 718 in front and rear directions. Inner side of the lower surface driving bridge lower surface work platform, characterized in that it consists of an inner working platform 70 having hydraulic drive type elevating device 71 fixed to each of the reinforcing rods 719 between the lower ends of the lifting platform 712. bench. According to claim 1, the inner side of the workbench is formed in a rectangular shape, the lower end of each of the remaining three surface side except the inner side surface member (Sf) side of the left and right molds are erected by hinges (731a), respectively, erected by the connector 732 High-elevation type horizontal work platform 72a provided with folding fences 73a that can be folded and folded outward, It is installed symmetrically in each front and rear between the high elevating horizontal working platform (72a) and both lower lower working tables (50, 51), the high elevating horizontal working platform (72a) to the upper end of the left and right lower working tables (50) (51) A hydraulically driven lifting and lowering device capable of varying its supporting height while supporting each of them, the outer lower platform being installed as a hinge 713a on the guide rail 55a fixedly installed at a lower end of the lower workbench inwardly. 711a, the lower lower platform 711a and the middle portion is freely arranged in the X-shape with the shaft pin 717a so that the lower end of one side slides to the guide rail 55a by the roller 716a. ) And the upper and lower lower platforms 711b and 712b of the same configuration as the upper and lower lower platforms 711a and 712a on the upper ends of the inner and outer lower platforms 711a and 712a, respectively, and are symmetrically expanded. And the inner phase The upper end of the lifting platform 711b is installed to slide on the guide rail 721a of the high elevating horizontal work platform 72, 72a by the roller 715a, and the upper end of the outer upper platform 712b is elevated by the hinge 714a. It is installed on the steel horizontal working platform (72a), respectively, between the lower end of the outer lower platform (711a) and the upper end of the inner lower platform (712a) two hydraulic cylinders (718a) between the upper and lower reinforcement rods (719a) (719b) The inner working platform of the lower surface running bridge lower surface working platform, characterized in that it consists of a high lifting deformation inner working platform 70 having a high lifting type lifting device 71a.