JP2009121108A - Reinforcement assembling method for high-rise structure reinforcing method, and reinforcement assembling jig for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reinforcement assembling method which is applicable to the case of reinforcing a high-rise structure by using an elevating scaffold, and contributes to continuous arrangement of axial reinforcements and hoops without using a large crane, to thereby bring about drastic shortening of a construction period. <P>SOLUTION: The reinforcement assembling method is provided for carrying in and assembling reinforcement materials to the high-rise structure 1 by using the elevating scaffold 3. According to the method, hoists 5 are set on an upper portion of the high-rise structure 1, and jigs 20 for holding the plurality of reinforcements are loaded on the elevating scaffold 3, followed by hoisting the jigs 20 holding the reinforcements 12 from the elevating scaffold 3 by the hoists 5, to thereby assemble the reinforcements 12 held by the jigs 20 to the high-rise structure 1. Then intervals between the reinforcements 12 are adjusted by the jigs 20. Specifically the axial reinforcements 12 are vertically held at horizontal intervals by the jigs 20. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a reinforcing bar assembling method in a reinforcing method for a high structure and a reinforcing bar assembling tool used therefor.

  In order to seismically reinforce existing concrete piers, for example, according to Patent Document 1, at least a pair of longitudinal grooves are formed on the opposing surfaces of the existing piers, and both ends of intermediate strip reinforcing bars inserted into through holes formed between the longitudinal grooves are , Fixed to the supporting steel material fixed in the longitudinal groove, multiple reinforcing bar reinforcing bars are arranged on the surface of the existing pier, and several reinforcing bar reinforcing bars are penetrated through the supporting steel material and existing from above the reinforcing axial steel bars A reinforcing structure is known that is wound around the outer periphery of a bridge pier and covered with a mortar covering layer with these reinforcing steel bars and supporting steel materials.

  By the way, as a construction location of a structure having a height exceeding 25 m (hereinafter referred to as a high structure), there are many places in mountainous areas, mountainous areas and valleys in coastal areas, and the construction conditions are severe. In the past, in order to seismically reinforce high structures, framework scaffolds were installed along the piers and constructed using the RC winding method. In addition, it was necessary to lift the steel material with a large crane for assembling the reinforcing bars, and it was necessary to secure a large work yard.

In addition, rebar and formwork assembly work is usually performed using a large crane, but there are many cases where large heavy machinery such as cranes do not enter in mountains and coastal areas, so do not use cranes. There is a need for an efficient construction method.
In the past, rebar / formwork assembly and concrete placement have been carried out with, for example, about 5 m as one cycle. However, many steps are required by assembling and constructing a frame scaffold every cycle.

  In other words, when a seismic reinforcement of a high structure is performed, it takes a lot of days because the scaffold is installed in accordance with the concrete placement height.

  Here, according to Patent Document 2, an elevating scaffold is known, which is composed of one work table that moves up and down along a plurality of support columns, and is provided with a flexible connecting portion that can be bent on the floor plate of the work table. Yes.

Further, according to Patent Document 3, the apparatus main body is composed of four segments that are respectively placed on a scorpion so as to surround the support portion of the pier, and adjacent ones are connected and fixed to each other. A screw mechanism is provided at the tip, and the upper structure is pushed by this screw mechanism to press and fix the device body to the saddle. Each segment is provided with a support bar, and each support bar is electrically operated. 2. Description of the Related Art A suspension device for a bridge pier in which a winch is detachably supported is known.
Japanese Patent Laid-Open No. 11-036230 JP 07-197641 A Japanese Patent Application Laid-Open No. 09-302949

  However, the construction of the gibber, axial rebar, and strip rebar for high-structure structures cannot be performed continuously, requiring a long work period. In addition, since it is difficult to secure a work yard at high-structure construction sites, development of a construction method that does not require a large crane has been sought.

  In other words, in a site such as a mountain or a valley, a crane may not be used for operations such as rebar assembly. Therefore, it is necessary to assemble the rebar by lifting it with a hoist. However, in order to suspend with a hoist, since the efficiency of the existing lifting method is low, it is necessary to improve the efficiency by a method that cooperates with, for example, the lifting scaffold of Patent Document 2 and the electric winch or the like of Patent Document 3. .

An object of the present invention is to provide a construction method that can continuously construct an axial rebar and a belt rebar without using a large crane, and greatly shorten the work period when reinforcing a high structure with a lifting scaffold. Is to provide.
In addition, the problem of the present invention is suitable for use in a reinforcing bar assembly method in such a high structure reinforcement method, and is transported to a work location on a lifting scaffold, and is refilled with a jig and fixed to an existing reinforcing bar, It is to provide a jig that can be set to a design rebar interval and can be assembled.

  In order to solve the above-mentioned problems, the invention according to claim 1 is a method for carrying in and assembling a reinforcing material using a lifting scaffold for a high structure, and installing a hoist on the upper part of the high structure, A jig holding a plurality of reinforcing bars is mounted on the lifting scaffold, the jig holding the plurality of reinforcing bars is lifted from the lifting scaffold by the hoist, and the plurality of reinforcing bars held by the jig are It is characterized by being assembled to a high structure.

  The invention described in claim 2 is a reinforcing bar assembling method in the reinforcement method for a high structure according to claim 1, characterized in that intervals between the plurality of reinforcing bars are adjusted by the jig.

  The invention according to claim 3 is a reinforcing bar assembling method in the reinforcement method for a high structure according to claim 1 or 2, wherein the axial reinforcing bars are vertically held by the jig with a space in the lateral direction. It is characterized by that.

  The invention according to claim 4 is a reinforcing bar assembling method in the reinforcing method for a high structure according to claim 1 or 2, wherein the reinforcing bars are held horizontally by the jig in the vertical direction. It is characterized by.

  The invention according to claim 5 is a reinforcing bar assembling method in the reinforcement method for a high structure according to claim 4, wherein the U-shaped band reinforcing bar is horizontally lifted by the hoist in a state where both sides are lifted. It is assembled to the high structure.

The invention according to claim 6 includes a plurality of reinforcing bar holding portions for holding a plurality of reinforcing bars one by one,
A reinforcing bar assembling tool including an interval adjusting unit that adjusts an interval between the plurality of reinforcing bar holding units.

  The invention according to claim 7 is the reinforcing bar assembly jig according to claim 6, wherein the reinforcing bar holding part is provided on an engaging member that engages with a feed screw of the interval adjusting part. Features.

  The invention described in claim 8 is the reinforcing bar assembly jig according to claim 7, further comprising a link mechanism that interlocks the engaging member when the feed screw rotates.

  According to the present invention, when reinforcing a high structure with a lifting scaffold, the construction of the axial rebar and the belt rebar can be performed continuously without using a large crane, so the construction period can be greatly shortened.

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.
(Embodiment)
FIG. 1 shows the construction of a gibber bar in seismic reinforcement of a bridge pier as a configuration of an embodiment of the seismic reinforcement method for a high structure to which the present invention is applied. 1 is a concrete pier (high structure), 2 is a mast ( (Support column), 3 is a work platform (elevating scaffold), 4 is a ceiling rail, 5 is a hoist, and 11 is a gibber muscle.

As shown in the figure, a work that is an elevating scaffold that moves up and down along two masts 2 on the front and rear sides so as to surround the four front and rear four sides of a concrete pier (hereinafter simply referred to as a pier) 1 that is a high structure. A platform 3 is provided. The work platform 3 is equipped with an electric motor which is a drive source for the lifting operation. In addition, a plurality of hoists 5 each moving along a ceiling rail 4 parallel to the front and rear surfaces of the pier 1 are provided on the upper portion of the pier 1.
The mast 2 may be one each before and after. Further, in the illustrated example, the work platform 3 is configured such that the work platform 3 that moves up and down along the front and rear masts 2 forms a pair. The ceiling rail 4 is disposed between the pier 1 and the mast 2. The ceiling rail 4 is fixed to the pier 1 or the mast 2. Further, the ceiling rail 4 is also constructed between both ends of the ceiling rail 4.

  The work platform 3 is loaded with the seismic reinforcement material using the hoist 5 provided on the ceiling rail 4. Here, the gibber muscle 11 is loaded and the work platform 3 is raised along the mast 2. Each time the vehicle is stopped, as shown in the figure, the gibber muscles 11 are assembled to the outer surface of the pier 1.

  FIG. 2 shows the construction of the next axial rebar / strand reinforcement, 12 is an axial rebar, and 13 and 14 are rebars.

  That is, the work platform 3 is loaded with the axial rebar 12 surrounding the pier 1 around the hoist 5 of the ceiling rail 4, the straight rebar 13, and the U-shaped rebar 14 in plan view. Each time the work platform 3 is raised or stopped, an axial rebar 12 is assembled around the pier 1 as shown in the figure, and a linear rebar 13 and a U-shaped band in a plan view with respect to the axial rebar 12. The reinforcing bar 14 is assembled.

  FIG. 3 shows the next formwork / concrete placement, in which 15 is the formwork and 16 is the cast concrete.

  That is, the work platform 3 is loaded with a form 15 using the hoist 5 of the ceiling rail 4, and each time the work platform 3 is raised or stopped, the form 15 surrounding the reinforcing bars assembled around the pier 1 is provided. Further, as shown in the figure, after the work platform 3 is raised and stopped, concrete is placed in the mold 15. In the illustrated example, for example, the mold removal from the first stage to the third stage is completed, and the cast concrete 16 appears, which is the fourth-stage mold 15 / concrete placing process.

FIG. 4 shows the next mold release.
As shown in the figure, for example, the mold 15 is removed from the mold after the casting of the fifth stage and the final sixth stage of the mold 15 and concrete.

Next, FIG. 5 shows an axial rebar assembling method in the axial rebar / band rebar construction shown in FIG. 2, and 20 is a rebar assembling jig.
As shown in the figure, the axial rebar 12 is held vertically with a space in the horizontal direction using a pair of upper and lower rebar assembly jigs 20 suspended by cables 6 fed from a pair of hoists 5 of the ceiling rail 4. It is assembled in the state.

  As shown in an enlarged view in FIG. 6, the reinforcing bar assembly jig 20 adjusts the intervals between the plurality of reinforcing bar holding parts 21 that hold a plurality of reinforcing bars one by one, and the plurality of reinforcing bar holding parts 21. An interval adjusting unit 31. The reinforcing bar holding portion 21 is of a type that is fixed to a pipe-shaped holding fitting 22 with a part cut away by tightening a bolt 23 through a reinforcing bar (axial reinforcing bar 12 in the drawing).

  The interval adjusting unit 31 includes a feed screw 32 whose axis is in the horizontal direction, a plurality of engagement members 33 engaged with the feed screw 32 at equal intervals, and the plurality of engagement members 33. It is comprised from the link 34 * 35 linked | linked when 32 rotates. In the illustrated example, a set of two links 34 and a link 35 are rotatably connected between adjacent engaging members 33, and a fixed plate 36 rotatably assembled to one end of the feed screw 32, A set of two links 34 is rotatably installed between adjacent engaging members 33.

Here, the engaging member 33 that is not shown in the drawing between the fixing plate 36 and the engaging member 33 at the opposite end is loosely engaged with the feed screw 32. And the holding | maintenance metal fitting 22 of the reinforcing bar holding | maintenance part 21 is attached to one side surface of the rotation connection part of link 34 * 35 corresponding to the position of the engaging member 33. FIG.
As described above, the distance adjusting unit 31 is engaged with the expansion and contraction operation of the links 34 and 35 between the engagement member 33 at the end opposite to the fixed plate 36 in conjunction with the rotation of the feed screw 32. The interval between the members 33 is changed while maintaining an equal interval.

  FIG. 7A shows the reinforcing bar holding by the reinforcing bar assembly jig 20 described above. In the illustrated example, a link 35 and a fixing member 37 are provided in place of the fixing plate 36 described above. The fixing member 37 is rotatably assembled to one end of the feed screw 32, and the holding member 22 of the reinforcing bar holding portion 21 is provided on the fixing member 37. In the illustrated example, the axial reinforcing bars 12 are held by other reinforcing bar holding parts 21 except for the reinforcing bar holding part 21 of the fixing member 37.

FIG.7 (b) showed the shrinkage | contraction adjustment of the space | interval adjustment part 31, FIG.7 (c) shows the fixation to the preexisting rebar 12A in the contracted state and the reinforcement space | interval adjustment with an arrow, As illustrated, the reinforcing bar holding part 21 of the fixing member 37 is fixed to the preceding existing reinforcing bar 12A at the end.
In this way, by fixing the reinforcing bar holding part 21 of the fixing member 37 to the preceding existing reinforcing bar 12A while adjusting the contraction of the interval adjusting part 31 to make it compact, the reinforcing bar assembling tool 20 can be secured without being dangled.
Thereafter, as shown by the arrows, the distance adjusting unit 31 is stretched and adjusted.

  FIG. 7D shows the pressure welding of the axial rebar 12 to the lower preceding existing rebar 12B, and the axial rebar 12 held by a pair of upper and lower rebar assembling jigs 20 simplified by phantom lines. Are fastened and pressed against the preceding existing reinforcing bar 12B.

The assembly flow of the above axial rebar 12 is as follows.
1. The axial rebar 12 is attached to the rebar assembly jig 20.
2. Shrinkage adjustment of the space | interval adjustment part 31 of the rebar assembly jig 20 is carried out.
3. The reinforcing bar assembly jig 20 is suspended in the work platform 3 by a small crane (not shown).
4). The work platform 3 is raised to the work location.
5). The rebar assembly jig 20 is lifted by the hoist 5.
6). The reinforcing bar assembly jig 20 is fixed to the preceding existing reinforcing bar 12A at the end.
7). The distance adjusting part 31 of the reinforcing bar assembling jig 20 is stretched and adjusted.
8). The axial rebar 12 of the reinforcing bar assembling tool 20 is tightly bonded and pressed to the lower preceding existing reinforcing bar 12B.

  Next, FIG. 8 shows a method for assembling the band rebar in the axial rebar / band rebar construction shown in FIG. 2. As shown in the figure, the band rebars 13 and 14 are fed out from a pair of hoists 5 of the ceiling rail 4. The rebar assembling jig 20 suspended by the cable 6 is assembled using a pair of left and right or a pair of front and rear in a state of being held horizontally with a space in the vertical direction.

  Here, FIG. 9A shows the arrangement of the rebars 13 and 14. The axial rebar 12 is surrounded around the pier 1 so that the parallel straight rebars 13 are opposed to each other as shown in the figure. A band rebar 14 having a U-shape in plan view is assembled.

FIG. 9B shows a holding position of the U-shaped band rebar 14 in plan view by the reinforcing bar assembly jig 20, and the U-shaped band rebar 14 in plan view has a reinforcing bar at the center as shown in the figure. It is held by the holding part 21, and both sides are held at the corresponding points P by the cable 6 fed out from the pair of hoists 5 of the ceiling rail 4.
In this way, both sides of the U-shaped band reinforcing bar 14 in plan view are lifted and assembled by the hoist 5 at a predetermined height.

  FIG. 9 (c) shows a holding position of the linear band reinforcing bar 13 by the reinforcing bar assembly jig 20, and the linear band reinforcing bar 13 is held by the reinforcing bar holding part 21 at both ends as shown in the figure. Is done.

  FIG. 10 is an enlarged view of the reinforcing bar assembly jig 20 shown in FIG. 8B. Basically, the feed screw 32 of the reinforcing bar assembly jig 20 is directed in the vertical direction, and the engaging member 33 holds the reinforcing bar. The holding metal fitting 22 of the part 21 is provided.

FIG. 11 shows a holding method different from the holding method of the reinforcing bar holding part 21 of FIG. 10, and FIG. 11 (a) shows a rotary reinforcing bar holding part 24. As shown in FIG. It is a rotary type that attaches and detaches the strip reinforcing bars 13 and 14 by combining the holding brackets 25 and 26 in the shape of a ring.
FIG. 11B shows a one-touch type reinforcing bar holding portion 27. As shown in the figure, for example, the hook-type holding bracket 28 is combined with a stopper pin 29 to attach and detach the band reinforcing bars 13 and 14. is there.

FIG. 12 shows a reinforcing bar take-in guide 40 on the work platform 3. As shown in the figure, on the floor surface of the work platform 3, a pair of left and right inclined guide plates 41 and a curved guide plate 42 continuous above the left and right inclined guide plates 41. A reinforcing bar take-in guide 40 is installed.
As shown in the figure, a pair of rebar assembling jigs 20 holding the rebar 13 is provided with a fixing plate 36 as shown in the figure on the side of the pier 1 on a predetermined floor surface on the work platform 3 by a small crane (not shown). Set down. At this time, the band reinforcing bar 13 held by the reinforcing bar assembling jig 20 is in the vicinity of the inclined guide plate 41 of the pair of reinforcing bar take-in guides 40.

  Then, after connecting the cable 6 fed from the pair of hoists 5 of the ceiling rail 4 to the pair of rebar assembly jigs 20 and then lifting the rebar assembly jig 20 by the hoists 5, the rebar assembly jig 20 holds the rebar assembly jig 20. The band reinforcing bar 13 is raised while being guided by the inclined guide plate 41 of the pair of reinforcing bar take-in guides 40 and is lifted by being hung to the pier 1 side by the curved guide plate 42 on the upper part thereof.

  FIG. 13 shows the fixing to the pre-existing reinforcing bars 13A and 14A by the reinforcing bar assembly jig 29. Except for the lowermost reinforcing bar holding part 21, the reinforcing bar 13 (or the band reinforcing bar 14) is connected to the other reinforcing bar holding parts 21. ) Is held. Thereafter, as shown in the drawing, the lowermost reinforcing bar holding portion 21 is fixed to the lower preceding existing reinforcing bar 13A (or the preceding existing reinforcing bar 14A).

  The assembly flow of the band rebars 13 and 14 is the same as the assembly flow of the axial rebar 12 described above.

  As described above, according to the construction method of the embodiment, when the seismic reinforcement is performed on the pier 1 by the work platform 3, the construction of the gibber reinforcement 11, the axial reinforcement 12, and the strip reinforcements 13 and 14 can be continuously performed. Can be greatly shortened.

In the above embodiment, the pier is seismic strengthened, but the present invention is not limited to this, and the object of seismic strengthening may be a high structure such as a tower.
Further, the structure of the lifting scaffold is arbitrary, and it is needless to say that other specific detailed structures can be appropriately changed.

BRIEF DESCRIPTION OF THE DRAWINGS The structure of one Embodiment of the seismic reinforcement method of the high structure to which this invention is applied is shown, It is the schematic side view (a) and the same front view (b) which showed the construction of the gibber reinforcement in the seismic reinforcement of a bridge pier. It is the schematic side view (a) and the same front view (b) which showed the axial direction reinforcement and the band reinforcement construction following the construction of FIG. It is the schematic side view (a) and the same front view (b) which showed the formwork and concrete placement following the construction of FIG. It is the schematic side view (a) and the same front view (b) which showed the mold form demolding following construction of FIG. It is the schematic side view (a) and the same front view (b) which showed the axial direction reinforcing bar assembly method in the axial direction reinforcing bar and belt reinforcing bar construction of FIG. It is an expansion perspective view of the jig part of FIG. FIG. 6A is a perspective view showing the reinforcement holding by the jig of FIG. 6A, and FIG. 6B is a diagram showing the shrinkage adjustment of the jig; FIG. c) It is the figure (d) which showed the press contact of the axial direction reinforcement to the preceding existing reinforcement. It is the schematic side view (a) and the same front view (b) which showed the band reinforcement assembly method in the axial direction reinforcing bar and band reinforcement construction of FIG. A plan view (a) showing the arrangement of the band reinforcing bars, a diagram (b) showing the U-shaped band reinforcing bar jig holding position in a plan view, and a diagram showing the holding position of the linear band reinforcing bar jig ( c). It is an expansion perspective view of the jig part of FIG.8 (b). It is the figure (a) and (b) which showed the holding system different from the holding system of FIG. It is the perspective view which showed the reinforcing bar taking-in guide on a raising / lowering scaffold. It is the perspective view which showed fixation to the prior | preceding existing reinforcement by the jig of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 High structure 2 Support | pillar 3 Lifting scaffold 4 Ceiling rail 5 Hoist 6 Cable 11 Givel bar 12 Axial rebar 13 Linear strip reinforcing bar 14 U-shaped strip reinforcing bar 15 Formwork 16 Placing concrete 20 Reinforcement assembly jig 21 Reinforcing Bar Holding Part 22 Holding Bracket 23 Bolt 24 Reinforcing Bar Holding Part 25 Holding Bracket 26 Holding Bracket 27 Reinforcing Bar Holding Part 28 Holding Bracket 29 Stopper Pin 31 Space Adjusting Part 32 Feed Screw 33 Engaging Member 34 Link 35 Link 36 Fixing Plate 37 Fixing Member 40 Reinforcing Bar Retention Guide 41 Inclined Guide Plate 42 Curved Guide Plate

Claims (8)

It is a method of carrying in and assembling reinforcing materials using a lifting scaffold for high structures,
Install a hoist on top of the high structure,
A jig for holding a plurality of reinforcing bars is mounted on the lifting scaffold,
Reinforcing the high structure, wherein the jig holding the plurality of reinforcing bars is lifted from the lifting scaffold by the hoist, and the plurality of reinforcing bars held by the jig are assembled to the high structure. Rebar assembly method in the construction method.   The reinforcing bar assembling method in the reinforcing method for a high structure according to claim 1, wherein an interval between the plurality of reinforcing bars is adjusted by the jig.   The reinforcing bar assembling method in the reinforcing method for a high structure according to claim 1 or 2, wherein the jigs hold the axial reinforcing bars vertically with a gap in the horizontal direction.   The reinforcing bar assembling method in the reinforcing method for a high structure according to claim 1 or 2, wherein the reinforcing bars are held horizontally by the jig with a space in the vertical direction.   5. The reinforcing bar assembling method in the reinforcing method for a high structure according to claim 4, wherein the U-shaped band reinforcing bar is assembled to the high structure in a state where both side portions are horizontally lifted by the hoist. A plurality of reinforcing bar holding portions for holding a plurality of reinforcing bars one by one;
A rebar assembling jig comprising: a space adjusting unit that adjusts a space between the plurality of rebar holding units.   The reinforcing bar assembly jig according to claim 6, wherein the reinforcing bar holding part is provided on an engaging member that engages with a feed screw of the interval adjusting part.   The rebar assembly jig according to claim 7, further comprising a link mechanism that interlocks the engagement member when the feed screw rotates.

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