JP5394334B2 - Construction method of work floor for work at height - Google Patents

Description

  The present invention works in a free working space that is not obstructed by a lifting rail or lifting device when a work floor for working at a high place is constructed by hanging with a lifting device that rises along a lifting rail. The present invention relates to a method for constructing a work floor for working at high places, which can be secured on the floor and can support the work floor easily and with good height position accuracy.

  Patent Document 1 is known as a technique that enables a work at a high place to be performed in a form in which a temporary material is raised by an elevating device and a rail.

  The “lifting device in the all-weather construction method” of Patent Document 1 is provided with a liftable support pillar that can be lifted, a base member that is temporarily installed on the frame along the liftable support pillar, and a hydraulic jack is provided from the base member. A hydraulic clamp is provided that stands up and is arbitrarily mechanically clamped to the lifting body support column at the tip of the piston rod and the base member protruding upward from the hydraulic jack.

JP-A-6-330636

  By the way, when lifting a working floor or materials for working at high places using a lifting device that rises along the rail, the lifting device is always located above the suspended working floor, and the rail. Needs to extend further upward. Therefore, for example, in the work space on the work floor, there is always a portion that is blocked by these lifting devices and rails, and this narrows the work space, so that the work can not proceed smoothly. When the member to be installed is within the range where the member is to be installed, there is a problem that it is necessary to carry out construction avoiding this and repair after dismantling the rail.

  Further, when the work floor is lifted and installed at a predetermined height position, it has been desired that the support structure can be installed easily and with high position accuracy under the work floor.

  In addition, while working on the work floor, it may be possible to temporarily remove these lifting devices and rails, but when the work floor is suspended and lowered after the work is completed, the rails are placed on the work floor. It is necessary to install and attach an elevating device, which necessitates a complicated operation of re-attaching these rails and the like. When constructing a building on the work floor, there may be no longer space for installing rails and lifting devices on the work floor, and it is assumed that the work floor must be dismantled at a high place. .

  The present invention was devised in view of the above-described conventional problems, and is used for lifting and lowering rails that are lifted along lifting rails to construct a work floor for working at high places. A construction method for a work floor for working in high places that can secure a free work space on the work floor that is not obstructed by the lift and the lifting device and that can support the work floor easily and with good height position accuracy. The purpose is to provide.

  The construction method of the work floor for high-altitude work according to the present invention is such that an elevating rail having an extended rail portion extending the lifting lift is attached to any pillar erected on the foundation; Assemble the working floor for working at a high place on the support bracket; have a gripping mechanism that releasably holds the lifting rail at the base end and the telescopic end of the jack that is extended and retracted. A lifting device that lifts and lowers repeatedly by the operation and the gripping / releasing operation of the gripping mechanism is installed on the lifting rail; the work floor is supported on the lifting device via the first lifting device, and the second lifting device The support bracket is supported at a position below the work floor, and the lift device is lifted along the lift rail toward the extension rail portion so that the work floor and the support bracket are lifted. The Lifting up to the fixed height position of the support bracket; fixing the support bracket to the column side; descending the lifting device and installing and fixing the work floor on the support bracket; In order to make the upper part of the work floor free space, the extension rail portion is removed from the lifting rail after removing the first and second suspension tools and the lifting device.

  The above-described construction method for the work floor for working at high places is carried out, and then, on the column base side, the lifting device is installed on the lifting rail; and the working floor is placed via the support bracket In order to carry it by the lifting device, the lifting device is raised to just below the supporting bracket; after the lifting device is connected to the lifting bracket, the fixing to the pillar side is released, and the lifting device is operated as described above. Supporting the floor; lowering the lifting device toward the column base; fixing the support bracket to the column side; and then removing the lifting device, dismantling the work floor and the above The support bracket is removed.

  The first hanger is configured by engaging a downward U-bolt with a girder connected to the lifting device and an upward U-bolt, and the upward U-bolt is suspended by being connected to the girder. And a clamping means connected to the downward U-bolt of the suspension member and detachably clamps the work floor.

  In the construction method of the work floor for working at high places according to the present invention, when the work floor for working at high places is constructed by hanging with a lifting device that rises along the lifting rail, It is possible to secure a free work space on the work floor that is not obstructed by the lifting and lowering device, and to support the work floor easily and with good height position accuracy.

It is a plane layout figure of the support work which supports the bridge pier and work floor in viaduct construction in the preferred embodiment of the construction method of the work floor for high place work concerning the present invention. FIG. 2 is a front view of a lifting rail mounting stage in the viaduct construction shown in FIG. 1. FIG. 2 is a front view of a work floor grounding stage in the viaduct construction shown in FIG. 1. It is a front view of the assembly | attachment stage of the raising / lowering apparatus, a lifting tool, etc. with respect to the raising operation | work of the work floor in the viaduct construction shown in FIG. It is a principal part enlarged front view of FIG. It is a front view of the hydraulic jack expansion | extension stage of the raising / lowering apparatus in the viaduct construction shown in FIG. FIG. 2 is a front view of a work floor ascending stage due to contraction of a hydraulic jack in the viaduct construction shown in FIG. 1. It is a principal part enlarged side view of FIG. It is a front view of the ascending stage to the extension rail part in the viaduct construction shown in FIG. FIG. 2 is a front view of a work floor lift completion stage in the viaduct construction shown in FIG. 1. It is a front view of the construction stage of the bridge part in the viaduct construction shown in FIG. It is a front view of the assembly | attachment step of the raising / lowering apparatus with respect to the descent | fall work of the work floor in the viaduct construction shown in FIG. FIG. 2 is a front view of a stage of supporting a support bracket by a lifting device in the viaduct construction shown in FIG. 1. It is a principal part expanded side view of FIG. FIG. 2 is a front view of a work floor descent completion stage in the viaduct construction shown in FIG. 1.

  Hereinafter, a preferred embodiment of a method for constructing a work floor for working at high places according to the present invention will be described in detail with reference to the accompanying drawings. In this embodiment, the case where the bridge part of a viaduct is constructed | assembled with the work floor for high place work is illustrated. FIG. 1 shows a plan layout of a support pier 2 that supports a pillar pier 1 and a work floor 3 (see FIG. 3 etc.).

  A plurality of pairs of piers 1 facing each other in the width direction of the viaduct are arranged at intervals in the length direction of the viaduct. In the illustrated example, the size of the support bridge 2 supporting the work floor 3 in the length direction of the viaduct is formed by the span between the piers 1 and 1 along the length of the viaduct. On the other hand, the two left and right supporters 2 are formed with a span larger than the span between the piers 1 and 1 with one end thereof projecting outward from the position of the pier 1.

  First, an operation stage in which the work floor 3 for working at high places is raised and installed will be described. As shown in FIG. 2, each pier 1 is erected on a foundation 4, and an annular fixing frame 5 is attached and fixed to an outer peripheral surface of the erected pier 1 at an appropriate height. In the illustrated example, the pier 1 is formed in a rectangular shape in a flat cross section, and the fixed outer frame 5 is formed in a rectangular shape so as to surround the outer peripheral surface of the pier 1.

  On each pier 1, a lifting rail 6 is fixedly attached to a fixed frame 5. These elevating rails 6 are arranged so as to face the length direction of the viaduct, and at the places where the piers 1 face each other, the elevating rails 6 are also arranged so as to face each other. The elevating rail 6 is made of H-shaped steel, and either one of the flanges is joined to the fixed frame 5 and fixed. The lifting rail 6 is an extended rail portion 6a whose upper end portion extends the lifting head, and this extended rail portion 6a is removable.

  In the present embodiment, the fixed frame 5 has a lower end portion (corresponding to a column base portion) of the pier 1 and a height position slightly lowered from the extended rail portion 6a with respect to such an elevating rail 6. The lifting rail 6 is provided at three positions facing the extension rail portion 6a. The lifting rail 6 is supported at three locations including the extension rail portion 6a. When the extension rail portion 6a is removed, the lifting rail 6 is The upper and lower ends are supported at two locations. The extension rail portion 6a can be removed from the fixed frame 5 when the extension rail portion 6a is removed.

  Next, in a region surrounded by, for example, four piers 1, as shown in FIG. 3, a work floor 3 for working at high places is assembled on the lower end side of the pier 1 close to the ground surface G. At this time, first, box-shaped support brackets 7 are respectively installed at the lower end positions of the four lifting rails 6 (see FIG. 5). The support bracket 7 is slidably attached to the elevating rail 6 in contact with the flange of the elevating rail 6 by a slide guide portion 7a provided thereto (see FIG. 8).

  Then, the work floor 3 is assembled on the support bracket 7. The work floor 3 is configured by stretching a floor material on an H-shaped steel main girder 2 a and a horizontal girder 2 b constituting the support work 2.

  First, the main girder 2a is placed over the support brackets 7 of the two bridge piers 1 adjacent to each other in the width direction of the viaduct. The area is surrounded by four piers 1, and therefore two main girders 2a are juxtaposed. Thereafter, a plurality of cross girders 2b are arranged across the main girders 2a, 2a in the length direction of the viaduct, and finally a floor material is stretched on the cross girders 2b. Thereby, the assembly of the work floor 3 supported by the support work 2 is completed. On the work floor 3, scaffolding necessary for construction of the bridge portion, additional support work, formwork, and the like may be mounted.

  Next, as shown in FIG. 4, the lifting device 8 is installed on each lifting rail 6 so as to be positioned above the main beam 2a. As shown in FIGS. 5 and 8, the lifting device 8 is provided at each of the hydraulic jack 8 a that is driven to extend and contract, the cylinder end that is the base end of the hydraulic jack 8 a, and the piston rod tip that is the extension end. It comprises a pair of upper and lower gripping mechanisms 8b and 8c. Each gripping mechanism 8b, 8c performs an operation of gripping or releasing the flange of the lifting rail 6.

  The lifting device 8 is lifted by releasing the gripping of the flange by the upper gripping mechanism 8b while gripping the flange of the lifting rail 6 by the lower gripping mechanism 8c, and then extending the hydraulic jack 8a to move the upper gripping mechanism 8b. Shift upward, then grip the flange with the upper gripping mechanism 8b, then release the grip of the flange by the lower gripping mechanism 8c, then contract the hydraulic jack 8a to shift the lower gripping mechanism 8c upward, Finally, the stroke of gripping the flange by the lower gripping mechanism 8c is set as one cycle, and the lifting and lowering operation of the hydraulic jack 8a and the gripping mechanisms 8b and 8c are repeatedly repeated along the lifting rail 6 by repeating the gripping and releasing operations. To go.

  Further, in the descending operation of the lifting device 8, the gripping of the flange is released by the lower gripping mechanism 8c while the flange is gripped by the upper gripping mechanism 8b, and then the hydraulic jack 8a is extended to shift the lower gripping mechanism 8c downward. Next, grip the flange with the lower gripping mechanism 8c, then release the grip of the flange by the upper gripping mechanism 8b, then contract the hydraulic jack 8a to shift the upper gripping mechanism 8b downward, and finally, The process of gripping the flange by the upper gripping mechanism 8b is taken as one cycle, and then descends along the lifting rail 6 sequentially.

  The lifting device 8 is provided with a safety device so that both the upper and lower pair of gripping mechanisms 8b and 8c are not released simultaneously. Each hydraulic jack 8a of each lifting device 8 is driven by a dedicated hydraulic pump so that it can be lifted and lowered by the same lift amount even if the load distribution acting on each hydraulic jack 8a is different.

  In the present embodiment, the lifting device 8 is provided with a guide piece 8d in order to stabilize the lifting operation. The guide piece 8d has a plate assembly structure, and a slide guide 8e provided for the guide piece 8d is slidably attached to the lifting rail 6 in contact with the flange of the lifting rail 6.

  The guide piece 8d is connected to one of a pair of upper and lower gripping mechanisms 8b, 8c via a "<"-shaped movable arm 8f. Both ends of the movable arm 8f are rotatably connected to the guide piece 8d and the gripping mechanisms 8b and 8c, so that, for example, the guide piece 8d and the gripping mechanisms 8b and 8c associated with the unevenness of the elevating rail 6 can be used. It is designed to be flexible with respect to misalignment.

  When the work floor 3 is lifted, the guide piece 8d is connected to a lower gripping mechanism 8c that supports the work floor 3 that is a heavy object. The lifting device 8 is configured such that the flange of the lifting rail 6 is gripped by the pair of upper and lower gripping mechanisms 8b and 8c in a state where the hydraulic jack 8a is contracted so that the guide piece 8d is positioned immediately above the work floor 3. , Attached to the lifting rail 6.

  Next, as shown in FIGS. 4, 5, and 8, the lifting / lowering device 8 is caused to support the work floor 3 via the first lifting device 9. The first hanger 9 includes a girder material 9a connected to the guide piece 8d of the lifting device 8, a clamp means 9b for detachably clamping the work floor 3, and a hanger material 9c for suspending the clamp means 9b from the girder material 9a. It consists of.

  The girder material 9a is appropriately formed with a length dimension in the main girder 2a direction. The girder material 9a is suspended from the guide piece 8d so that the hanger piece 9d joined thereto is rotatably connected to the guide piece 8d. At both ends of the beam member 9a, four suspension members 9c are provided in a pair in the width direction of the beam member 9a.

  Each suspension member 9c is configured to be rotatable about three axes by engaging an upward U-bolt 9e pin-connected to the beam member 9a and a downward U-bolt 9f pin-connected to the clamp means 9b to each other. . The four clamping means 9b connected to each downward U-bolt 9f clamp the upper flange of the main girder 2a from both sides in the flange width direction by tightening and loosening the screws. The work floor 3 is suspended by the lifting device 8 so as to be swingable by the first lifting tool 9 having the above-described configuration.

  Further, the lifting device 8 is caused to support the support bracket 7 via the lever block 10 which is the second suspension tool. The lever block 10 is easy to adjust the suspension height, and is provided to be locked to any two clamping means 9b. The lever block 10 is connected to the support bracket 7 via the shackle 11, whereby the support bracket 7 is suspended below the work floor 3 with a clearance from the work floor 3.

  Next, as shown in FIGS. 6 to 8, the expansion and contraction operation of the hydraulic jack 8a and the gripping and releasing operations of the gripping mechanisms 8b and 8c are repeated, and the work table 3 and the support bracket 7 are moved up and down by the lifting device 8. Raise along the rail 6. During the ascending operation, the elevating device 8 is guided to move relative to the elevating rail 6 by the slide guide 8e of the guide piece 8d, and the suspended work table 3 and the support bracket 7 are slid on the support bracket 7. These movements are guided by the guide 7a.

  In addition, the lower gripping mechanism 8c and the guide piece 8d are competing with each other, the guide piece 8d and the work floor 3 are competing, and the first suspension 9 and the supporting bracket 7 are competing with the movable arm 8f and the first suspension, respectively. 9. Absorbed and absorbed by the lever block 10.

  As shown in FIG. 9, the elevating device 8 is raised along the elevating rail 6 toward the extended rail portion 6a. The fixed height position of the support bracket 7 is set so that the suspension position of the support bracket 7 is below the extension rail portion 6a when the lifting device 8 reaches the extension rail portion 6a. The height of the suspension bracket 7 is finely adjusted by the lever block 10, and then the support bracket 7 is joined and fixed to the lifting rail 8. It may be joined to the pier 1.

  At this time, there is a gap between the main beam 2 a of the support 2 and the support bracket 7 by the lever block 10, and the suspension height of the main beam 2 a installed on the support bracket 7 correspondingly. Is slightly higher than the fixed position of the support bracket 7.

  Next, the lever block 10 is removed from the support bracket 7, the lifting device 8 is slightly lowered, and the main girder 2 a is installed and fixed on the support bracket 7. As a result, the weight of the work floor 3 is supported by the pier 1 erected on the foundation 4. Next, the first hanger 9 is removed from the main beam 2a. Thereafter, although the detailed procedure is not limited, the lever block 10 and the first lifting device 9 are removed from the lifting device 8, and the lifting device 8 including the guide piece 8 d is removed from the extended rail portion 6 a of the lifting rail 6. .

  Thereafter, the extended rail portion 6a is removed from the lifting rail 6 together with the fixed frame 5 to which it is fixed. As a result, as shown in FIG. 10, the work floor 3 can be almost completely free of work space S without any obstruction.

  In this way, after any of the work floors 3 is installed, the removed lifting and lowering device 8, the first hanger 9, and the lever block 10 are diverted to the work of raising the work floor 3 of another span. Of course, these elevating devices 8 may be prepared for each span, and the work floor 3 may be lifted in parallel.

  Next, as shown in FIG. 11, the construction work of the bridge 15 is performed by assembling the scaffolding 12, the additional support 13, and the formwork 14 on the work floor 3 supported on the support bracket 7.

  Next, an operation stage in which the work floor 3 for working at high places is lowered to the ground surface G and disassembled will be described. At the time of lowering, the extended rail portion 6a is removed, and the bridge 15 is constructed at this position. Therefore, the lowering work is performed in a form different from the hanging form. On the work floor 3, a package 16 such as a dismantled scaffold is mounted. As shown in FIG. 12, the lifting device 8 is installed on the lifting rail 6 on the lower end side of the pier 1. At this time, unlike the time of ascent, the guide piece 8d is positioned on the upper gripping mechanism 8a and attached to the elevating rail 6.

  Next, as shown in FIG. 13, the lifting device 8 is raised to just below the supporting bracket 7, and the lifting floor 8 is made to bear the work floor 3 via the supporting bracket 7. At this time, as shown in FIG. 14, after the support bracket 7 is connected to the guide piece 8 d via a bullman (not shown), the fixing of the support bracket 7 to the lifting rail 6 is released. Therefore, when descending, the work floor 3 is lowered in a carrying manner, unlike in the hanging manner. Also at this time, the movable arm 8f ensures flexibility for the competition between the guide piece 8d and the upper gripping mechanism 8a.

  Next, as shown in FIG. 15, the lifting device 8 is lowered along the lifting rail 6 toward the lower end side of the pier 1. The position where the lower gripping mechanism 8c of the elevating device 8 reaches the lower end of the elevating rail 6 and the hydraulic jack 8a contracts is the position where the work floor 3 is lowered most.

  At the lowest position of the work floor 3, the support bracket 7 is joined and fixed to the lifting rail 6 or the pier 1, whereby the work floor 3 is again supported by the pier 1. In this state, the lifting device 8 is removed from the lifting rail 6. Similarly, in the case of the descent work, the lifting device 8 may be diverted to the descent work of the work floor 3 of another span.

  For the work floor 3 supported by the support bracket 7, the detailed procedure is not limited, but the floor material and the cross beam 2 b are disassembled and the main beam 2 a on the support bracket 7 is removed, and then the support floor 3 is used for support. The bracket 7 is removed from the lifting rail 6. Further, the lifting rail 6 and the fixed frame 5 are removed from the pier 1.

  In the construction method of the work floor for working at a high place according to the present embodiment described above, the extension rail portion 6a for extending the lifting lift is made removable, and therefore the lifting device is accompanied with the removal of the extension rail portion 6a. 8 is also removed, and a free work space S that is not obstructed can be secured on the work floor 3 for working at high places, so that the work can proceed smoothly.

  The support bracket 7 is supported via the lever block 10 at a position lower than the work floor 3 supported by the first lifting tool 9, and after the support bracket 7 is fixed to the lifting rail 6, the lifting device 8 is mounted. Since the work floor 3 is installed and fixed on the support bracket 7 by lowering, the support bracket for supporting the work floor 3 without being affected by the support height of the work floor 3 7 can be installed on the lower side of the work floor 3 easily and with high position accuracy, and smooth and safe construction of the work floor 3 for working at high places can be ensured.

  In addition, when the work floor 3 is lowered, the work floor 3 is constructed in such a manner that it is carried by the lifting device 8 via the support bracket 7 instead of the hanging form. It is not necessary to attach the hanger 9 or the hanger 9 and the like, and the labor can be saved. Accordingly, the lowering work can be appropriately performed without causing interference with the bridge 15 portion constructed on the work floor 3.

  Moreover, since the work floor 3 is raised and lowered using the lifting device 8, the work floor 3 including the support work 2 can be assembled or dismantled near the ground surface G, and the work can be performed in a low place. The safety is high and the work can be facilitated.

  Moreover, when constructing a bridge work with the work floor 3 installed at a high place, the space between the piers 1 and 1 immediately below it can be opened as a free space F and can be used effectively (see FIG. 11). . In addition, since the entire load of the work floor 3 and the like can be supported by the pier 1, it is not necessary to secure high foundation ground strength in the space between the piers 1 and 1, greatly reducing the amount of work and materials in the viaduct construction. can do.

  Since the work floor 3 is detachably clamped and held by the clamping means 9b with respect to the first hanger 9, the main girder 2a incorporated in the work floor 3 is damaged as compared with the case of joining by welding or the like. In addition, it is possible to easily cope with changes in the dimensions of the main beam 2a and changes in the support position in other spans. Further, since the suspension material 9c is a combination of U bolts 9e and 9f, even if the lifting rail 6 is inclined with respect to the pier 1 or is displaced from side to side, the suspension material 9c can be used flexibly. Thus, the work floor 3 can be appropriately lifted.

  In addition, the lifting device 8 and the suspension tools 9 and 10 can be diverted, and the resource can be saved. With the guide piece 8d, the lifting device 8 can be moved up and down stably along the lifting rail 6. Since the support bracket 7 is slidable with respect to the lifting rail 6 by the slide guide 7a provided therein, the supporting bracket 7 lifted separately from the work floor 3 can be safely and smoothly along the lifting rail 6. Can be moved.

  Since the guide piece 8d and the gripping mechanisms 8b and 8c of the elevating device 8 are connected via the movable arm 8f, the competition between the two can be absorbed and absorbed smoothly. The height position of the support bracket 7 can be finely adjusted by the lever block 10, and the support bracket 7 can be installed and fixed to the lifting rail 6 or the like with high positional accuracy at a high place.

  In the embodiment described above, the viaduct work has been described as an example, but it is needless to say that the present invention can be applied to various kinds of work that require a work floor for work at high places.

DESCRIPTION OF SYMBOLS 1 Bridge pier 3 Work floor 4 Foundation 6 Lifting rail 6a Extension rail part 7 Support bracket 8 Lifting device 8a Hydraulic jack 8b, 8c Grip mechanism 9 First lifting tool 9a Girder material 9b Clamp means 9c Lifting material 9e Upward U bolt 9f Downward U bolt 10 Lever block S Free working space

Claims (3)

Attach an elevating rail with an extended rail part to extend the lifting lift by supporting it on any pillar erected on the foundation,
Assemble the work floor for working at high places on the support bracket on the column base side,
An elevating device that has a gripping mechanism for releasably gripping the lifting rail at the base end and the telescopic end of the jack that is driven to extend and retract and lifts and lowers repeatedly by repeating the expansion and contracting operation of the jack and the gripping and releasing operation of the gripping mechanism, Installed on the lifting rail,
The lifting device is supported on the work floor via a first suspension, and the support bracket is supported on a position below the work floor via a second suspension.
The lifting device is raised along the lifting rail toward the extension rail portion, and the work floor and the support bracket are lifted to a fixed height position of the support bracket,
Fix the support bracket to the column side,
Lower the lifting device, install and fix the work floor on the support bracket,
Then, after removing the first and second suspensions and the lifting device, the extension rail portion is removed from the lifting rail in order to make the work floor above a free working space. Construction method of work floor for work. The construction method of the work floor for high-altitude work according to claim 1 is carried out, and then further,
On the column base side, the lifting device is installed on the lifting rail,
In order to carry the work floor with the lifting device via the support bracket, the lifting device is raised to just below the support bracket,
After the support bracket is connected to the lifting device, the fixing to the pillar side is released, and the lifting device is supported by the lifting floor,
Lowering the lifting device toward the column base,
Fix the support bracket to the column side,
Then, after removing the said raising / lowering apparatus, the said work floor is disassembled and the said bracket for support is removed, The construction method of the work floor for high places work characterized by the above-mentioned.   The first hanger is configured by engaging a downward U-bolt with a girder connected to the lifting device and an upward U-bolt, and the upward U-bolt is suspended by being connected to the girder. And a clamping means connected to the downward U-bolt of the suspension member and detachably clamps the work floor.

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