KR19980014142A - Lower side running bridge Lower part of work carriage Lower work bench Rotating support device - Google Patents

Abstract

The present invention relates to a bridge for constructing and assembling a unit assembly member of a predetermined length continuously on a bridge pier, such as a PC (prestressed concrete) bridge, a forced box boring bridge, and the like, The lower workbench rotating support device for the lower bridge work carriage for joint work, assembly surface treatment, epoxy treatment, painting work, shoe inspection, shoe replacement work, lower surface inspection, will be.

The lower work bench rotation supporting device is an important device for safely and smoothly using a work platform. The present invention relates to a traveling device for moving and traveling the entire lower work platform, And a lower support table provided below the work table support table for supporting the entire worker car with the traveling apparatus disposed thereabove so as to rotate the lower work table in a predetermined direction while supporting the lower work table, A vertical support member installed between the upper end of the vertical support member and the work station of the wing to rotate the vertical support member at an arbitrary rotation angle, And a lower work table at the lower end of the vertical support member, And a lower work table bearing means for holding the work table at a predetermined height. The lower work table is securely and securely supported when working the lower surface of the mold, and the lower and upper work tables required for the movement to the other span And a lower work bench rotating support device of a lower work traveling bridge lower work carriage which is capable of smoothly, safely and conveniently performing a rotation operation for coupling with a lower work platform.

Description

Lower side running bridge Lower part of work carriage Lower work bench Rotating support device

FIG. 1 is a front view of a bridge lower work carriage of an example of a bottom run running type applied to one example of a PC bridge. FIG. 2 is a rotational state view when the work carriage of the first configuration is moved to the next span, Fig. 3 is a side view of the traveling device in the configuration of Fig. 1, Fig. 4 is a side view of the upper and lower positioning devices of the traveling device in the configuration of Fig. 1, Fig. 7 is a sectional view of a rail fixing structure of a traveling device in the configuration of Fig. 1, Fig. 8 is a sectional view of the configuration of the first embodiment of the present invention implemented in the configuration of Fig. Fig. 9 is an enlarged view of a rotation support apparatus, Fig. 9 is a main constituent sectional view of a rotation support apparatus of an embodiment of the present invention, Fig. 10 is an embodiment of the present invention, In the present invention, Match the examples, the examples 12 to turn one of the lower surface work balance applying a further embodiment the rotation support unit of the invention, claim 13 claim 12 degrees nor lifting device configuration overview of the rotary support device of the configuration.

BRIEF DESCRIPTION OF THE DRAWINGS

S1, S2: PC (prestressed concrete) Bridge main girder

S1x, S2x: a mold having side members different in height from each other in one span

Sa, Sb, Sc, and Sd: the wings of both sides of the molds S1 and S2

Se: Outer side member of the mold Pr1, Pr2: Pier

10: left and right traveling device 20: right and left wing worktable

30: left and right rotation support device 50: left and right lower work table

60: end coupling device 70, 70a: left and right inner wing workbench

80: lifting device 111 of left and right inner wing worktable 111: rail fixing table

111a: Fixture of another embodiment 112: Fixing bolt for fixture

114: fixing bolt for rail 12, 12a: rail

121: lower blade of the rail 14: drive wheel

15: idle wheels 141, 151: cylindrical auxiliary wheel

16: Wheel bracket 17: Drive motor

22: upper frame 23, 24: front and rear vertical frames

25: Horizontal working plate 26: Vertical frame

26a: Horizontal frame 27: Lower position alignment device

28: upper position aligning device 271: flow bracket of lower aligning wheel

272: Lower alignment wheel 273: Hydraulic cylinder of the lower flow bracket

281: flow bracket of upper aligning wheel 282: upper aligning wheel

283: Hydraulic cylinder of upper alignment bracket 31: Vertical support member

32: upper cylinder tube 33: turn flange

34: connecting hole 35, 35a: driving bracket

38: Bearing member 37: Turntable

40, 40a: rotary hydraulic cylinder 42: cylinder rod

43: Lower work bench pivot hinge 48: Hydraulic unit

49: Height adjusting hydraulic cylinder 61, 62: Fixing ring member

65: Hydraulic cylinder for retaining ring 63: Rotating hook

66: Fixing hook 30a: Other embodiment Rotary support device

31a: Long truss member 44:

45: Height stretch hydraulic cylinder 45a: Rod end

46a, 46: upper and lower horizontal axis rods 462, 461: upper and lower pulleys

47: moving pulley W1, W2: pulley driving wire

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a rotary support apparatus for supporting and rotating a lower work bench in a bridge lower surface work platform 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 many kinds of works to be carried out at the lower part of the bridge at the time of construction or after completion. Particularly, in the case of bridges constructed by continuously assembling and assembling the unit assembly members of a certain length, such as PC (prestressed concrete) bridges, and forced box boring bridges, joint work, assembly surface processing, epoxy processing, There is a lot of work to be done on the lower side such as replacing work, inspection of the lower part, inspection, and repair.

However, PC bridges and forced box boring bridges require a work platform for lower bridge work, because there is no other structure besides a bridge bridge on the lower side of the bridge. A main girder is installed on the bridge pier and is supported on the upper and lower ends of the cantilever on both sides of the pier so as to be installed across the lower surface of the mold, It is a device that is provided for use as a workbench to carry out maintenance work and maintenance works after completion of bridges.

The type of undercarriage of the lower bridge of the bridge is composed of a top-running type in which the top surface of both side wing portions of the mold is a running surface, and a bottom-side running type in which the entire working car is supported at the lower ends of both wing portions of the mold, In each type, there are commonly provided a traveling device for moving the entire work vehicle along the bridge, a wing workbench fixed integrally with the traveling device for supporting the entire workbench, and a lower workbench The vertical supporting device is rotatably supported by the vertical support device and is supported in the form of a cantilever truss. The vertical supporting device is horizontally disposed on the lower end surface of the mold during operation. When the cantilever passes, And a lower work table which is rotated and passed without interfering with each other. Basically, depending on the beam type of the bridge, In eopdae it may also be configured having a separate inner wing bench additionally.

The construction and operation characteristics of the overall work platform depend on the configuration of the individual components of the bridge lower surface work platform formed with the above-described components.

The lower part of the running bridge of the lower part of the bridge has the structural characteristics that most of the components should be placed on the lower side of the bridge so that the load of the entire work carriage should be supported at the lower ends of both wings of the mold, When moving to the other span, the lower workbench fixed in the transverse direction is fixed to the lower end surface of the mold by 90 degrees and passes through the bridge pier And the lower workbench is required to be fixed in the transverse direction to the lower end surface of the mold. Therefore, the rotation support device of the lower runway-type workbark is suitable for the structural characteristics and operating characteristics Is an important device that is required.

An object of the present invention is to provide a high-quality rotation supporting device capable of smoothly rotating a lower work platform while smoothly supporting a lower work platform in a lower floor running type bridge construction.

It is another object of the present invention to provide a lower work bench rotation support apparatus having elastic height adjusting means which can be used universally even at a span having a high height of a side member of a mold.

According to an aspect of the present invention for achieving the above object, there is provided a traveling apparatus for traveling along a bridge, the traveling apparatus being provided on a rail fixed to lower ends of wings of both sides of a mold, A rotary support device installed below the wing table worktable for supporting the lower work table and rotating the lower work table in a predetermined direction when necessary while supporting the lower work table, A rotation driving means installed between the upper end of the vertical supporting member and the wing work table for rotating the vertical supporting member at an arbitrary rotation angle; And a lower workbenkeaning means for keeping the workpiece at a predetermined height .

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a front structural view of a bridge lower work carriage of an example of a bottom run of an example constructed for a prestressed concrete (PC) bridge, FIG. 2 is a front view of a lower work table rotation state when the work carriage is moved to the next span to be.

Sb, Sc, and Sd represent two molds S1 (S1, S2, S3, S7, S6, S7, S6) S2 respectively show the outer side members of the two molds S1 and S2, Pr1 and Pr2 denote the piers supporting the mold, and Ap denotes the road packaging unit, respectively.

The construction of the bridge lower surface working carriage of the lower stage running type installed in the PC bridge of the above-described constitution is constituted by a left-right symmetrical device around the boundary (engagement portion) of the left and right molds S1 and S2, And the tip of the lower workbench is detached and joined at the boundary portion.

An important arrangement is such that the entire work carriage is supported by the rail 12 fixed to the outer wings Sa and Sd of the two molds S1 and S2 while being self-supportingly moved along the bridge A left and right wing portion work table 20 for supporting the entire operation truck by hanging the traveling device 10 at the upper end thereof, A vertical support member 31 installed between the upper end of the vertical support member 31 and the wing platform 20 so as to rotate the vertical support member 31 at an arbitrary rotation angle, And a lower work table bearing member 30 which couples the lower work table 20 with the lower work table 20 at the lower end of the vertical support member 31. The left and right rotation support devices 30, And the outer side of the lower work bench is supported by the lower work bench bearing member And a truss member having a rectangular cross-sectional shape which is pivotally mounted on the upper and lower surfaces of the two molds S1 and S2. Each of the truss members is provided with a front end coupling device 60, And the front ends of the joined right and left truss members are separated when passing through the piers Pr1 and Pr2 so that the left and right rotation support devices 30 supporting the respective truss members are separated from each other A left and a lower work table 50 configured to rotate the truss members by 90 degrees with rotation driving devices of the left and right lower work tables 50 and 50 so as not to interfere with the both side piers Pr1 and Pr2; And a left and right inner wing worktable (70) installed so as to be adjustable in installation height by a wing (80).

Reference numerals 14 and 15 denote drive wheels and idle wheels that are laid on the upper surfaces of both sides of the lower end wing 121 of the rail 12 in the same rotational axis and 16 are the drive wheels 14 and idle wheels 15 Reference numeral 27 denotes a flow bracket 271 which is provided on the front and rear sides of the inner end of the horizontal working plate 25 so as to be freely movable, A lower aligning wheel 272 is axially installed on the outer side of the lower end of the flow bracket 271 so as to be rotated in the longitudinal direction of the molds S1 and S2 and the lower end of the flow bracket 271 and the lower end of the horizontal working plate 25 A hydraulic cylinder 273 is provided between the inner lower end and the lower end of the flow bracket 271 is rotated to the lower end side of the outer side member Se of the molds S1 and S2 by the hydraulic cylinder 273 When the position of the lower work table to be described later is fixed or during the span movement stroke, 0) is prevented from being inclined toward the outer side member Se of the mold, and is arranged horizontally. Reference numeral 28 denotes an upper outer side of the front and rear vertical frames 26 provided on the outer upper end surface of the horizontal working plate 25 And the upper bracket 282 is rotated in the longitudinal direction of the molds S1 and S2 so that the upper bracket 282 is rotated in the longitudinal direction of the molds S1 and S2, The hydraulic cylinders 283 are operated to fix the front and rear upper alignment wheels 282 to the outer wings Sa of the molds S1 and S2, respectively, And is arranged to press the lower end surface of the wing portion Sd so that the wing worktable 20 is prevented from tilting in the outward direction of the mold so as to maintain the horizontal position. The ladder structure 20 provided on the work table 20 side Reference numeral 91 denotes a counterweight of the left and right lower workbenches 50. Reference numeral 96 denotes a power trolley bar for supplying power to the drive motor 17 and all the electric power mechanisms. Reference numeral 97 denotes a power trolley bar hanger. Reference numeral 111 denotes a rail And reference numeral 112 denotes fixing bolts for fixing the fixing table 112 to the outer wings Sa and Sd of the molds S1 and S2, respectively.

An embodiment of the present invention, which is applied to a lower bridge work carriage of the lower running type of the above-described structure, has a configuration in which a rotary shaft member is provided on the left and right wing work tables 20 The vertical support member 31 is installed between the upper end of the vertical support member 31 and the wing platform 20 so as to rotate the vertical support member 31 at an arbitrary rotation angle And a lower work table bearing member for vertically moving the lower work table 20 at the lower end of the vertical support member 31. [

In the structure of the left and right rotation support device 30 according to an embodiment of the present invention, the vertical support member 31 includes an upper cylindrical pipe 32 having a lower end portion as a truss member and a turn flange 33 at the outer circumference of the upper end, Left and right drive brackets 35 and 35a having connection holes 34 positioned on the left and right center lines of the upper cylindrical pipe 32 at the upper end of the turn flange 33 and left and right lower work benches 50 at the lower end, And a lower work bench pivot hinge (43).

The configuration of the rotation driving device that rotatably drives the vertical support member 31 having the above-described configuration at a predetermined angle while rotatably supporting the vertical support member 31 on the left and right wing worktable 20 includes a horizontal operation plate And a cylinder rod 42 fixed to the upper cylinder tube 32 and having a bearing member 38 on the upper surface thereof to rotate the turntable 33 in a rotatable manner, And a rotary hydraulic cylinder 40 (40a) connected to the connecting hole 34 of the bracket 35 (35a) and the body fixed to the outer side of the left and right wing worktable 20.

The lower work bench pivot hinge 43 formed at the lower end of the vertical support member 31 having the above-described structure is provided with a left and right worktable 50 having a square truss structure having a front end coupling unit 60 at its tip end, A height adjusting hydraulic cylinder 49 is provided between the upper end of the vertical support member 31 and the upper end of the outer side of the left and right lower workbenches 50. The lower end of each of the right and left lower workbenches 50, And a tension bar 93 is provided in front and rear respectively.

And reference numeral 48 denotes a hydraulic unit for operating all the hydraulic cylinders installed on the entire work truck.

The operation and effect of the embodiment of the present invention will now be described with reference to the operation and effect of the conventional bridge lower work platform.

The use state of the lower side running platform of the lower side of the bridge, which is installed in the PC bridge of one example, is the state of stopping and moving within one span at the time of operation and the span movement operation state when moving to the next span Is divided.

As shown in FIG. 1, the operation, installation, stopping, and moving operation states within one span of the work during operation are the same as those of the above-described one embodiment traveling device 10 and the configuration of the wing workbench 20 and the configuration of the left and right wing workbenches 20 and the left and right lower workbench 50 and the left and right inner wing workbenches 70 are controlled by the rotation drive device.

The vertical support members 31 of the left and right rotation support devices 30 are controlled by the left and right rotation drive devices while the drive wheels 14 of the left and right travel devices 10 are stopped, When the lower ends of the molds S1 and S2 are rotated so as to face each other and then both ends of the molds S1 and S2 are integrally coupled to each other by the end joining device 60, It becomes the stop use state in which the work can be performed.

At this time, in order to adjust the working height of the inner wing portion Sb (Sc), the elevating device 80 is operated to raise and lower the left and right inner wing worktable 70 to a proper height.

In the case of moving within a certain length of time in the above-described stopping state, the pressure-contact state between the left and right lower position aligning devices 27 and the upper and lower position aligning devices 28 is released, The drive wheel 14 travels along the rail 12 to move the entire work carriage along the molds S1 and S2 in the spanwise direction by drivingly controlling the drive motor 17 of the drive motor 10 in the moving direction The driving motor 14 is stopped and then the lower position aligning device 27 and the upper aligning device 28 are moved to the predetermined position, Are brought into pressure contact with the outer wings Sa and Sd of the molds S1 and S2, respectively.

After the operation in one span is completed by the above-described operation state, the span motion operating state in which the entire work carriage is moved to the next span passing through the bridge Pier Pr1 (Pr2) The aligning devices 27 and 28 are brought into pressure contact with the outer wings Sa and Sd of the molds S1 and S2 to stably align the left and right wing worktable 20 with each other.

Subsequently, when the left and right inner wing workbenches 70 are raised, the front end of the left and right workbenches 50 joined at the boundaries of the two molds S1 and S2 is moved downward by operating the elevating device 80, The coupling device 60 is released and separated.

Subsequently, the left and right lower work benches 50 of the left and right lower workbenches 50 are supported by the rotary hydraulic cylinders 40 and 40a, which are the left and right rotary drive devices, with the vertical support members 31 of the left and right rotary support devices 30, As shown in Fig. 2, and are rotated 90 degrees outwardly so as not to interfere with the bridge columns Pr1 (Pr2) to pass through, as shown in Fig.

Specifically, the cylinder rod 42 of the front side rotary hydraulic cylinder 40 is completely pulled, and the cylinder rod 42 of the rear side rotary hydraulic cylinder 40a is fully extended, The front side rotary hydraulic cylinder 40 moves the cylinder rod 42 in the engagement position where the drive brackets 35 and 35a of the front side rotary cylinder 32 are positioned at an angle of 45 degrees with respect to the center axis of the left and right lower workbenches 50 And the rear side rotary hydraulic cylinder 40a pushes the cylinder rod 42 and rotates it 90 degrees counterclockwise at the engagement position so that the left and right lower work tables 50 supported by the vertical support members 31 Are rotated 90 degrees to the rear side respectively and run in parallel in the outward direction so as not to interfere with the bridge pill Pr1 (Pr2) to be passed as shown in Fig.

When the left and right lower workbenches 50 are completely rotated as described above, the left and right lower position aligning devices 27 and the upper position aligning devices 28 are positioned at the outer wings Sa and Sd of the molds S1 and S2, And the driving motor 17 of the left and right traveling device 10 are separately or simultaneously controlled in a state of being in pressure contact with the outer side member Se and the outer side member Se.

When the left and right workbenches 50 separated from each other as described above move along the span and are sufficiently moved within the new span, the rotary hydraulic cylinders 40 and 40a of the left and right rotary drive devices, When the left and right lower work benches 50 are rotated to the center side and then the front ends of the left and right lower work benches 50 are integrally joined using the front end joining device 60, And a lower surface work table which is installed across the lower surface of the lower surface work table.

Adjustment of the engagement positions of the front ends of the left and right lower workbenches 50 as described above is carried out by adjusting the height of the vertical adjustment hydraulic cylinders (not shown) provided between the upper outer side of the vertical support members 31 and the outer upper ends of the left and right lower workbenches 49 can be operated, so that the fine adjustment of the height can be easily performed.

11 is a front end coupling device 60 added to improve the re-coupling and separation workability of the left and right lower workbenches 50. As shown in FIG.

This apparatus is provided with fixing hook members 61 and 62 at the upper and lower four ears at the tip of one side lower work table 50 and the fixing hook members 61 and 62 respectively at the upper and lower ends by the hydraulic cylinder 65 at the upper end of the other side lower work table 50 A rotary hook 63 which protrudes and retracts toward the front side in a turning radius so as to be engaged with the fixing hook member 61 at the upper end of the one upper side and is hooked at the lower end of the fixing hook member 62 at the lower side at the lower side And the stationary hook 24 can be provided. It is needless to say that the above configuration may be reversed or the upper and lower ends may be configured to be changed by hydraulic operation.

According to this example of the end coupling device 60, when the control device for controlling the hydraulic cylinder 65 is installed in the stable left and right wing workbenches 20, the horizontal position of the left and right lower workbenches 50 The upper and lower work benches 50 and the left and right lower work benches 50 and the left and right lower work benches 50 are separated from each other. As shown in FIG.

FIGS. 12 and 13 are a configuration diagram and an operation diagram of another embodiment of the rotation support apparatus 30a of the present invention.

This embodiment is characterized in that the supporting height of the working table of the left and right worktable 50 can be arbitrarily adjusted in the rotary drive apparatus of the embodiment of the present invention described above.

The rotary support device 30a is the same as the rotary drive device of the embodiment described above except that the vertical support member 31 is formed of a rectangular truss 31a and the left and right worktable 50, The outer end of the long truss member 31a is hinged to the outer side of the axle rest 44 which is inserted and raised outside the long truss member 31a, The upper and lower horizontal axle rods 46 and 45 are fixed to the rod end 45a of the high-tensioning and expanding hydraulic cylinder 45, respectively, Several lower pulleys 461 are axially arranged at regular intervals and a plurality of upper pulleys 462 are fixedly arranged in parallel with the lower horizontal axis rod 46 at the height of the fixed end side of the cylinder body, And the upper ends of the opposite ends (W1) W2 wound on the pulleys as shown in FIG. 13, and the inner free ends of the wires W1 and W2 are fixed to the inner side of the lower horizontal axis rod 46 And then the other side end is hooked on the inner side among the upper side pulleys 462 which are laid in the upper side horizontal axis rod 46a in a primary way and then the lower side pulley 461 is further inserted in the lower side pulley 461, And is finally wound up on the moving pulleys 47 provided on the upper ends of both sides of the roller bearing 44 to be lifted up to the upper end of the upper horizontal shaft rod 46a at the outer end And a lifting device using a pulley device for fixing the lifting device.

According to the elevating device configuration described above, when the rod 45a is pushed downward by actuating the high-stretch hydraulic cylinder 45 as shown in Fig. 13 (A) of Fig. 13, it acts to pull the moving pulley 47 upward. The rotary table 44 is lifted up by the long truss member 31a to raise the left and right lower work benches 50 and conversely the height stretch hydraulic cylinder 45 is operated as shown in FIG. The moving pulley 47 is lowered so that the axis 44 of the upper roller 44 descends on the longer truss 31a to lower the left and right lower workbenches 50. [ It acts as a landing gear.

According to the configuration of the rotation supporting device 30a of this other embodiment, as shown in Fig. 12, the height of the lower members of the molds S1 and S2 is high at the piercing side and gradually lowered at the center side The installation height of the left and right lower workbenches 50 when applied to the molds S1x and S2x and when the molds S1 and S2 of the lower lower member and the molds of the higher and lower members are combined, It is advantageous in that it can be used in a versatile manner while being easily adjusted.

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

For example, the configuration of the vertical support member 31 may be changed in consideration of the configuration of the left and right wing portion workbenches 20, the configuration of the left and right lower workbenches 50 and the support strength thereof, A separate annular guide flange or several roller-shaped guide members may be used as the bearing structure by extending the length thereof, and the construction of the stretchable vertical support member 31a may be a rectangular vertical outside support member having a lower end opened A separate scoped inner vertical support member capable of retracting downward is provided in the inner vertical support member, and the left and right lower workbenches (50) are hinged to the lower ends of the inner vertical support members, And the upper ends of the inner vertical supporting members are connected to each other so as to move up and down in a scoped manner.

Claims (8)

A traveling device installed on a lower portion of a bridge in which a wing portion is formed laterally such as a PC (prestressed concrete) bridge or a forced box beam bridge to move along a bridge while supporting the entire work vehicle, The rotary support device is supported by the rotary support device in the form of a cantilever truss beam. The rotary support device is horizontally disposed on the lower end surface of the mold during operation. When the cantilever passes, Wherein the rotary support device is provided with rails fixed to the lower ends of the wings of both sides of the casting mold, and the work carriage is mounted on the lower worktable, A traveling device for moving the entirety along the bridge, A vertical driving member which is rotatably and vertically installed on one side of the sub-workbench and is rotatable by the rotating shaft means; a rotation driving means for rotatingly controlling an upper end of the vertical supporting member by a hydraulic device; And a lower work platform bearing means for keeping the fluid material pipe at a constant height by installing a fluid material pump. The rotary support apparatus as claimed in claim 1, wherein the rotary support apparatus rotatably controls the left and right lower workbenches while supporting the entire worktable, wherein the lower end portion is a truss member and the upper end portion is an upper circular tube having a turn flange And left and right drive brackets 35 and 35a having connection holes 34 positioned on left and right center lines of the upper cylindrical pipe 32 are fixedly installed at the upper end of the turn flange 33, The lower truss member is provided with a lower work platform pivot hinge 43 for pivotally arranging the outer ends of the left and right lower work tables 50. The lower work trunk pivot hinge 43 is horizontally fixed to the left and right wing work tables 20, And a vertical support member (31) rotatably supported on a turntable (37) having a bearing member (38) for rotatably supporting the lower frame (33). Workbench Support structure. The rotary drive means for controlling the vertical support member to rotate by the hydraulic device according to claim 1 is characterized in that each cylinder rod is connected to the connecting hole of the left and right drive brackets (35, 35a) at the upper end of the vertical support member (31) And the body is constituted by rotary hydraulic cylinders 40 and 40a fixed to the outer side of the left and right wing work tables 20. The piers Pr1 and Pr2 to pass through the left and right lower work tables 50, And the left and right vertical support members 31 are respectively connected to either one of the left and right lower work tables 50 in such a manner that the left and right lower work tables 50 are engaged in a direction transverse to the lower end surface of the molds S1 and S2 Of the lower work platform of the lower running platform of the lower running platform. [3] The apparatus according to claim 1, wherein the lower end of the vertical support member is provided with a bearing means for vertically moving the lower work table. The upper end of the vertical support member (31) And a height adjustable hydraulic cylinder (49) installed between the upper and lower work platforms. The apparatus according to claim 1, wherein the bearing means for axially pivotally supporting the lower work table at the lower end of the vertical support member is provided with fixing hook members (61, 62) at the upper and lower ends of the upper and lower ends of the work table (50) And the other end of the left and right lower workbench 50 is provided with a rotary hook 63 which projects and retracts forward by a hydraulic cylinder 65 at an upper side thereof with a turning radius so as to be inserted into the upper end fixing hook member 61 from above, , And a fixed hook (24) that is engaged with the lower end of the fixed hook member (62) at the lower side at the lower side, and a fixed hook (24) Lower work bench rotation support device. The rotary support device according to claim 1, wherein the vertical support member is formed by a rectangular truss member (31a), and the outer ends of the left and right lower workbenches (50) are fitted to the outside of the long truss member (31a) And is hinged to the outer side of the elevated shaft 44. The shaft 44 is connected to the inner side of the long truss 31a and the outer side of the shaft 44 by a vertical truss (31a). The apparatus of claim 1 or 2, wherein the lower portion of the lower work carriage (31) is supported by a lower portion of the lower work table (31a). The elevating device of the axle table (44) which is vertically inserted into the long truss member (31a) according to claim 6 is characterized in that the upper end of the body is fluidly fixed to the inner upper end of the long truss member (31a) A plurality of downward pulleys 461 are arranged at predetermined intervals in a lower horizontal axis rod 46 fixedly provided on a horizontal line on the rod end 45a of the high expansion and contraction hydraulic cylinder 45, And a plurality of upper pulleys 462 are axially installed on the fixed end side of the cylinder body by fixing the upper horizontal axis rod 46a parallel to the lower horizontal axis rod 46, Each of the two free wires W1 and W2 wound on the pulleys is fixed to the inner end of the lower horizontal axis rod 46 and the other end is fixed to the other end of the lower horizontal axis rod 46. [ Among the upper pulleys 462 that are installed in the upper horizontal axis rod 46a And then is hooked on the inner side of the lower horizontal axis bar 46 and then is hooked on the inner side of the lower side pulley 461 which is extended in the lower horizontal axis rod 46. Finally, And the upper horizontal bar 46a is fixed to an outer end of the upper horizontal bar 46a. The lower work bench rotation support device of the lower work carriage of the lower bridge type as shown in FIG. A vertical support member of a rotary support apparatus according to claim 1, wherein the vertical support member of the rotary support apparatus is a rectangular vertical outer support member having a lower end opened, and a separate scope-shaped inner vertical support member capable of protruding downwardly is provided therein, The left and right worktable 50 is hinged to the lower end of the vertical support member so that the height-stretchable hydraulic cylinder is vertically moved from the upper end of the inner vertical support member to the upper end of the inner vertical support member, Of the lower work platform of the lower bridge running on the lower platform.