JP4101232B2 - Construction method using a temporary scaffolding that can be raised and lowered - Google Patents

Description

  The present invention relates to a construction method for a construction, and more particularly to a construction method for a construction using a temporary scaffold that moves to an upper floor in accordance with the progress of bar arrangement and formwork. .

  In general, in the construction of a middle- and high-rise building, after the construction of the basement or ground floor (first floor) frame or frame, the upper-level frame or frame is constructed sequentially. For example, in the construction work of steel-framed reinforced concrete structures (SRC structures), the steel frames that make up the pillars and beams on each floor are built sequentially from the lower floor to the upper floor, and the steel frame construction of the pillars and beams on the top floor is After completion, pillars and beams on each floor will be reinforced and formd sequentially from the lower floor to the upper floor, and the concrete placement process will be performed from the lower floor according to the progress of the bar arrangement and formwork. The

  When constructing medium- and high-rise buildings with such steel-framed reinforced concrete structures, it is necessary to temporarily install work scaffolds for constructing the reinforcing bars for the beams on the beams on each floor. In general, a suspension frame known as a pie hanger, high stage, cross hanger, or the like is temporarily installed under the beam in order to secure a work platform on both sides of the beam. , Rebar and part of the formwork).

  FIG. 23 is a cross-sectional view schematically showing the structure of this type of suspension frame scaffold.

  The suspension frame scaffolding includes a hanger attachment piece P, a hanger R, a cloth board S, and a handrail T. The hanger mounting piece P is welded to the lower surface of the flange portion of the steel beam B at a hanger mounting position planned in advance. The support portion of the hanger R is fixed to the piece P by a fastening tool such as a bolt and a nut. A horizontal member U of the hanger R oriented so as to be orthogonal to the beam B extends on both sides of the beam B, and a cloth plate S such as a steel tread is laid on the horizontal member U. The suspension frame scaffolding is temporarily installed on the steel beam B in the course of the steel frame construction work, and the reinforcement of the beam B is constructed by an operator on the suspension frame scaffolding after the completion of the steel frame construction. The suspension frame scaffolding is dismantled and removed at the time when the rebar construction is completed or when the formwork construction process is partially started, or moved to an unconstructed beam or the like.

  On the other hand, there are known temporary scaffolds that can be moved to upper levels according to the progress of construction work. As described in Japanese Utility Model Publication No. 63-1712 filed by the applicant of the present application, the temporary scaffold is arranged in a span area between beams and is suspended by a lifting / conveying device such as a crane. The lifting / conveying equipment raises the temporary scaffold to the upper floor according to the progress of the construction work.

 FIG. 24 is a plan view and a cross-sectional view schematically showing a configuration of a conventional temporary scaffold.

  FIG. 24 shows a column C and beams B1 and B2 constituting the framework of the building A. The building A is exemplified as a relatively small-scale (small building area) medium- and high-rise building having a steel-framed reinforced concrete structure with two spans in the girder direction and one span in the beam direction. As this type of building, a medium to high-rise building constructed in an urban area or a downtown area where the site area is limited may be exemplified.

  The framework of the building A is composed of a steel column C and steel beams B1 and B2. The beam B1 is disposed along the outer wall surface, and the beam B2 is disposed in the center of the building A. A reinforcing bar J is constructed around the H-shaped steel constituting the beams B1 and B2. Temporary scaffolds D that can be moved up and down are respectively disposed in the span area G surrounded by the beams B <b> 1 and B <b> 2, and the frame F of the temporary scaffolds D is suspended by a wire W of a lifting / conveying device such as a crane. . The temporary scaffold D ascends and descends the in-span region G in accordance with the wire W winding or feeding operation. In the outer peripheral region of the frame F, a work scaffold E for constructing the reinforcing bar J is formed. At the inner boundary of the frame F, a handrail for the scaffold E is provided. A horizontal crossing K that reinforces the frame F is disposed in the central opening of the temporary scaffold D.

When the bar arrangement for the lower floor beam (level nFL) is completed, the lifting / conveying equipment raises the temporary scaffold D to the level (n + 1) FL of the upper floor beams B1 and B2 as shown in FIG. Then, the reinforcement work of the beams B1 and B2 on the upper floor is performed by the worker on the temporary scaffolding D.
Japanese Utility Model Publication No. 63-1712

  However, when using the above-mentioned suspension frame scaffolds, usually, a sufficient amount of temporary equipment and auxiliary equipment capable of constructing all-floor or multiple-floor suspension frame scaffolds are procured and carried on-site, and these equipment are stocked. It must be stored in the yard, and it is necessary to secure a setup space or a ground space for the suspension frame scaffold when constructing the steel frame. In addition, when using the suspension frame scaffolding, it is necessary to factory weld the required number of hanger mounting pieces to the beams on each floor before constructing the steel frame, and to install the suspension frame scaffolding on each beam in front of the bar arrangement and formwork. In addition to this, work and a work period for disassembling the suspension frame scaffold after completion of the bar arrangement are required. For this reason, the construction method using this type of suspension frame scaffold has disadvantages in terms of the cost of temporary equipment and auxiliary equipment, equipment storage space, work space, work period, work man-hours, and the like. In addition, the strength of the suspension frame scaffolding depends on the support force of the hanger mounting piece welded to each beam and the holding force or restraining force of the fasteners that bind or connect the scaffold components, so all the floors It is necessary to individually manage the installation work, strength, proof stress, safety, etc. of the suspension frame scaffolding for the beams.

  On the other hand, when the temporary scaffold D that can be raised and lowered is used, the scaffold B of the temporary scaffold D is arranged on both sides of the beam B2 in the center. Reinforcing bars can be constructed. Therefore, for the beam B2 at the center of the building, the suspension frame scaffolding for the bar arrangement work could be omitted. However, with respect to the beam B1 around the outer wall, the temporary scaffold D can only be installed on one side of the beam B1, and therefore, in order to construct the rebar of the beam B1 around the outer wall, FIG. As described above, the suspension frame scaffold M must be installed on one side of the beam B1 to form a work scaffold for reinforcement construction of the beam B1. Therefore, conventionally, even when such a temporary scaffold is used, the suspension frame scaffold M has to be installed on the beam B1 at least for the reinforcement work of the beam B1 around the outer wall.

  Moreover, since the conventional temporary scaffolding D has a structure in which single pipes (steel pipes) are interconnected with fasteners, a temporary scaffolding having a size suitable for a span unique to a building must be planned each time. Moreover, since the temporary scaffold has a structure in which the reinforcing cross bars K are arranged in the central opening region as shown in FIG. 24, it is difficult to vertically convey the construction material using the central opening region.

  This invention is made | formed in view of such a subject, The place made into the objective is to provide the construction method of the construction which can abbreviate | omit installation of a suspension frame scaffold.

  Another object of the present invention is to provide a temporary scaffold for construction work that can be lifted and lowered that can form work scaffolds on both sides of the beam for the reinforcement work of beams around the outer wall.

  The present invention further provides a temporary scaffold for construction work that has a structure that can be relatively easily adapted to a span unique to a construction, and that can use the central opening region for vertical conveyance of construction materials. With the goal.

In order to achieve the above-mentioned object, the present invention uses a temporary scaffold capable of ascending and descending provided with a frame suspended in an intra-span region between beams by an elevating means and a work scaffold formed in an outer peripheral region of the frame. In the construction method of the construction
The scaffolding plate support member arranged on the frame body is projected from the lower beam region to the opposite side of the beam, and the scaffolding plate is supported by the protruding portion of the support member that is projected to the opposite side of the beam. With the working scaffold in the frame outer periphery region, a working scaffold is formed on both sides of the beam,
Provided is a construction method for constructing a structure, wherein the support member is drawn into the span inner region, the support member and the scaffold plate are retracted to the span inner region, and the temporary scaffold is moved up and down.

  According to the above configuration of the present invention, the protruding portion of the support member protruding to the opposite side of the beam supports the scaffold plate, and the scaffold plate forms a working scaffold in a region outside the span. Since the work scaffold is formed on both sides of the beam by the work scaffold and the work scaffold in the outer peripheral area of the frame body, it is possible to omit the installation of the suspension frame scaffold. Further, since the support member and the scaffolding plate are retracted to the intra-span region when the temporary scaffold is raised and lowered, the temporary scaffold can move up and down the intra-span region without interfering with the beam.

  Preferably, a handrail that can be displaced downward or deformed is disposed at a distal end portion of the scaffold plate support member, and a handrail associated with the scaffold plate is formed on the opposite side of the beam. The handrail is displaced or deformed downward when the scaffolding plate support member protrudes or retracts, and avoids interference with the beam that may occur during lifting.

  More preferably, the levels of the work scaffolds on both sides of the beam are set to be substantially the same, and the scaffold plate is displaced or deformed with respect to the support member, and the work in the outer peripheral region of the frame that may occur when the support member is retracted. Avoid interference with the scaffold.

  Preferably, an opening region is formed in the center of the frame body, a curing net that can be opened and closed is stretched in the opening region, and a vertical conveyance path for the construction material is formed by opening the curing net.

From another point of view, the present invention has a frame body suspended in the span area between the beams by the lifting means, and a work scaffold formed in the outer peripheral area of the frame body, and can be moved up and down in the span area. In the temporary scaffold for construction work to be arranged,
A scaffolding plate support member that is drawn into the span area when the temporary scaffold is raised and lowered, and projects to the opposite side of the beam from the lower beam area at the work level;
There is provided a temporary scaffold for construction having a scaffold plate supported by a protruding portion of the support member.

  According to the above configuration of the present invention, the temporary scaffold projects the support member to the opposite side of the beam at the work level, and the scaffold plate forms the work scaffold on the opposite side of the beam. Therefore, the temporary scaffold has the function of a conventional suspension frame scaffold and forms work scaffolds on both sides of the beam.

  Preferably, a handrail is provided at the tip of the support member. The temporary scaffold includes handrail retracting means for displacing or deforming the handrail downward when the support member protrudes into the outside span region or is pulled into the inside span region. According to such a configuration, interference between the handrail and the beam that occurs when the support member protrudes or retracts can be avoided by downward displacement or downward deformation of the handrail.

  More preferably, the temporary scaffold includes a scaffold board retracting means for displacing or deforming the scaffold board with respect to the scaffold board support member and retracting the scaffold board to the in-span region when the scaffold board support member is retracted. When the levels of the work scaffolds on both sides of the beam are set to be the same, the scaffold plate on the scaffold plate support member and the work scaffold in the outer peripheral region of the frame can interfere when the scaffold plate support member is retracted. The scaffold plate of the scaffold plate support member is displaced or deformed when the support member is retracted, and avoids interference with the work scaffold in the outer peripheral region of the frame body.

  According to the present invention, in the temporary scaffold configured as described above, the frame includes a plurality of brackets each having a vertical column and a horizontal horizontal member, a scaffold plate mounted on the horizontal member, and adjacent bracket columns. A temporary scaffold for construction work is provided that is formed by a connecting material that interconnects the two.

  According to the said structure of this invention, the frame of a temporary scaffold is formed with a bracket, a scaffold board, and a connection material. Since the planar dimensions of the frame are substantially determined by the number of brackets and the dimensions of the scaffolding plate, the number of brackets corresponding to the planar dimension of the in-span region and an appropriately sized scaffolding plate are employed. Thereby, the plane dimension of a frame can be set arbitrarily. Therefore, standardized brackets and scaffolding plates are prepared in advance, and the temporary scaffolding is formed by combining the brackets and scaffolding plate appropriately according to the situation at the construction site, thereby adapting the temporary scaffolding to the unique span of the building. Can be made. Note that the adjustment of the connecting material in accordance with the change in the bracket interval may be performed by, for example, designing the connecting material in a structure capable of adjusting the length, or preparing various lengths that can be selected in advance, or the like. The connecting structure between the connecting member and the bracket may be designed to be variably adjustable.

  The present invention further provides a temporary scaffolding, wherein a curing net capable of opening and closing the opening region is stretched in an opening region formed in a central portion of the frame body. To do.

  According to the temporary scaffold having such a configuration, safety measures such as fall prevention are achieved by the curing net, and by opening the curing net, the central opening region can be used for vertical conveyance of construction materials.

  If desired, the corners or corners of the frame body are partially reinforced by reinforcing diagonal members such as a horizontal firing member or a vertical cheek cane member in order to improve the rigidity or strength of the frame body.

  ADVANTAGE OF THE INVENTION According to this invention, the construction method of the construction which can abbreviate | omit installation of a suspension frame scaffold can be provided.

  In addition, according to the present invention, it is possible to provide a temporary scaffold for construction work that can be lifted and lowered that can form work scaffolds for arranging beams around the outer wall on both sides of the beams.

  Furthermore, according to the temporary scaffold having the above-described configuration in which the frame is configured by the bracket, the scaffolding plate, and the connecting material, the temporary scaffold for the construction work that can be moved up and down having a structure that can be relatively easily adapted to the span inherent to the building. Can be provided.

  Moreover, according to the temporary scaffold having the above-described configuration in which the openable and closable curing net is stretched in the central opening area of the frame body, a temporary scaffold for construction work that can use the central opening area for vertical conveyance of construction materials is provided. be able to.

  In a preferred embodiment of the present invention, the handrail includes a handrail strut holding mechanism fixed to the tip of the scaffold plate support member, a vertical handrail strut supported by the handrail strut holding mechanism, and the handrail strut holding the handrail strut. A handrail support fixing means for fixing to the mechanism and a horizontal handrail member supported by the handrail support. With the release of the handrail support means, the handrail support is lowered by the guide of the handrail support mechanism. As the handrail support mechanism, a vertical tube or a sheath tube that can be slidably inserted through the handrail support is used, and as a handrail support fixing means, a pin or bolt that can penetrate the handrail support mechanism tube and handrail support horizontally. Can be adopted. The handrail support or the handrail support mechanism may further include handrail height adjusting means.

  As a modification, the handrail post is designed to be a telescopic structure, a foldable structure, or a structure that can be rotated or pivoted to avoid interference with the beam when the scaffolding plate support member protrudes or retracts. Thus, the handrail post may be configured to be displaced downward or deformed downward.

  According to a further preferred embodiment of the present invention, the scaffolding plate retracting means has a fixing member fixed to the distal end portion of the support member, and a movable hinge member pivoting relative to the fixing member, and the movable hinge The member is integrally connected to the outer edge of the scaffold plate or its holder. The movable hinge member pivots about a horizontal axis perpendicular to the support member, and raises the scaffold plate on the handrail side. As a modified example, the scaffold plate may be designed to have a structure that can be bent or a structure that can move up and down.

  In a preferred embodiment of the present invention, the bracket has a hollow guide member into which the scaffold plate support member can be inserted. The support member has a square cross section, and the hollow portion of the guide member also has a square cross section. If desired, the support member and the guide member hollow portion may be designed to have another cross-sectional shape such as a circular cross-section. The outer surface of the support member is in sliding contact with the inner surface of the guide member. Preferably, the guide member and / or the scaffolding plate support member includes a relative position restricting unit that restricts a relative position between them. More preferably, the plurality of guide members are aligned and arranged below the horizontal horizontal member of the bracket. The proximal end portion of the scaffold plate support member protrudes from the guide member to the central opening region of the frame body. Desirably, the base end portion of the scaffolding plate support member is provided with a wire rod locking means such as a shackle, and a dropout prevention means for preventing the scaffolding plate support member from falling off.

  In a preferred embodiment of the present invention, the frame of the temporary scaffold is provided with a wire turning means such as a turning roller or an idler pulley, and the turning means turns a wire such as a wire rope that pulls the scaffold plate support member. The tow wire is appropriately turned by the wire turning means, and is branched as necessary, thereby simultaneously towing a plurality of scaffolding plate support members with a common drive source, and the tow direction is the support member protruding direction and the support member. It can set suitably in the drawing-in direction.

  The brackets described above can be broadly classified into first brackets (corner brackets) disposed at the planar view corners of the frame and second brackets (standard brackets) disposed between the first brackets. Preferably, a suspension portion capable of locking a wire material such as a wire rope for raising and lowering the temporary scaffold is disposed on the top portion of the first bracket.

  1-7 is sectional drawing which shows the construction method of the building based on this invention notionally, and the construction process of the building of a steel frame reinforced concrete structure is shown by each figure.

  FIG. 1 shows a state in which the steel frame construction work has been completed, and the reinforcement work for the steel column C and the steel beam B on the predetermined floor (level nFL) has been generally completed. Located at the level of beam B (level nFL). The temporary scaffold 1 includes a frame 2, an inner scaffold 3, a slide member 4, an outer handrail 5, and an outer scaffold 6. The slide member 4 constitutes a scaffold plate support member that can protrude to the outside of the beam B.

  The frame body 2 is arranged in the in-span region G, and the inner scaffold 3 is supported horizontally by the frame body 2. The slide member 4 is supported by the frame 2 so as to be slidable in the horizontal direction, and the outer scaffold 6 is supported horizontally by the slide member 4. The outer scaffold 6 forms a working scaffold at the same level as the inner scaffold 3 on the outside of the beam B, and the same level of working scaffold is formed on both sides of the beam B. The outer handrail 5 is supported by the outer end portion of the slide member 4 and forms a handrail at the outer edge boundary of the scaffold 6.

  A wire 7 such as a wire capable of suspending the temporary scaffold 1 (shown by a broken line) is connected to the frame 2. A beam locking tool 8 is attached to the outer end portion of the wire 7, and the beam locking tool 8 is locked to a flange portion of H-shaped steel constituting the beam B. The tip of the wire rope W3 is connected to the top of the frame 2. The wire rope W3 is suspended from a hook W2 of a lifting / conveying device (not shown) such as a crane. When the lifting / conveying device winds or feeds the wire W1, the temporary scaffold 1 moves up and down according to the winding operation or the feeding operation.

  A curing net 9 is stretched in the opening area formed at the center of the frame 2. The temporary scaffold 1 includes opening / closing means (not shown) for the curing net 9. The central opening area of the frame enables the vertical conveyance of the construction material by opening the curing net 9.

  In the work process such as the bar arrangement process shown in FIG. 1, the lifting / conveying device positions the hook W2 at a position where the wire rope W3 is relaxed, and the wire 7 is tensioned between the frame 2 and the beam B. Suspend the temporary scaffold 1. The load on the temporary scaffold 1 is transmitted to the beam B through the wire rod 7. The temporary scaffold 1 is supported in a stable state by the beam B, and the swing of the temporary scaffold 1 is considerably limited. Therefore, the workers on the scaffolds 3 and 6 must perform the bar arrangement work in a good working environment. Can do.

  FIG. 1 shows a state in which an operator (not shown) on the scaffolds 3 and 6 has almost completed the construction of the rebar J of the beam B. After the construction of the reinforcing bar J is completed, in order to raise the temporary scaffold 1, the outer handrail 5 is lowered, the slide member 4 is pulled into the in-span region G, and at the same time, the outer scaffold 6 is rotated upward. The lowered outer handrail 5 moves across the lower region of the beam B to the in-span region G without interfering with the beam B, and the outer scaffold 6 rotated upward interferes with the inner scaffold 3. Without moving to the in-span region G.

  Thus, the portion of the temporary scaffold 1 projecting to the opposite side of the beam B is retracted to the in-span region G as shown in FIG. 2, and as a result, the temporary scaffold 1 can be lifted and lowered without being blocked by the beam B. it can.

  The beam anchor 8 is removed from the beam B, the tension state of the wire 7 is released, and the temporary scaffold 1 is raised from the lower floor level nFL to the upper floor level (n + 1) FL by the wire winding operation of the lifting / conveying device. Then, the temporary scaffold 1 rises without the beam B being prevented from moving up. After the beam locking device 8 is locked to the upper level beam B (level (n + 1) FL), the wire hoisting force of the lifting / conveying device is weakened to loosen the wire rope W3. Suspended by the beam B on the upper floor, and thus the temporary scaffold 1 moves to the upper floor level as shown in FIG.

  Next, the outer scaffold 6 is rotated downward and the slide member 4 is protruded outward. The outer handrail 5 moves to the outside of the beam B beyond the beam B as shown in FIG. As shown in FIG. 5, when the outer handrail 5 is raised, work scaffolds 3 and 6 for constructing the rebar J of the beam B are formed on both sides of the beam B.

  After the construction of the reinforcing bar J is completed, as shown in FIG. 6, the outer handrail 5 is lowered, the slide member 4 is pulled into the in-span region G, and the outer scaffold 6 is simultaneously rotated upward. After releasing the engagement of the locking portion 8 with the beam B and releasing the wire 7, the temporary scaffold 1 is further raised to the upper level beam (level (n + 2) FL) by the lifting / conveying device as shown in FIG. Let Hereinafter, such an operation is repeatedly performed according to the progress of the bar arrangement / form work.

  According to the temporary scaffold 1 having such a configuration, since the work scaffolds can be formed on both sides of the beam B by the scaffolds 3 and 6, the rebar of the beam B can be constructed without installing the suspension frame scaffold under the beam. Can build a steel-frame structure. Moreover, the temporary scaffold 1 comprises the sliding stage which raises / lowers the area | region G in a span perpendicularly | vertically, and forms the work scaffold for constructing the rebar of the beam B of each floor according to the progress of construction on each floor.

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

  FIG. 8 is a plan view showing the overall configuration of the temporary scaffold, and FIG. 9 is a cross-sectional view taken along the line II of FIG.

  The temporary scaffold 1 includes a frame 2, an inner scaffold 3, a slide member 4, an outer handrail 5, and an outer scaffold 6 as main components. In the frame body 2, the standard bracket 11, the corner bracket 12, the brace 13, the handrail bar 14, the connecting member 15 and the fire striking member 16 are interconnected by a clamp mechanism and a locking mechanism, and these constituent elements 11 to 16 are integrated. It has a configuration.

  FIG. 10 is a plan view, a front view, a side view, and a rear view showing the structure of the standard bracket 11, and FIG. 11 is a plan view and a side view showing the structure of the corner bracket 12.

  As shown in FIG. 10, the standard bracket 11 includes a vertical column 21, a horizontal horizontal member 22, an oblique member 23, a connector 24, a distal end side guide member 25, and a proximal end side guide member 26. The vertical column 21, the horizontal member 22, and the diagonal member 23 are made of steel pipes having a circular cross section, and are integrally connected by fixing means such as welding or bolts and nuts. If desired, a metal material having another cross-sectional shape such as a square cross-section may be used as the vertical column 21, the horizontal member 22, and the diagonal member 23. In this example, the inner scaffold 3 (shown by phantom lines) is made of a steel tread, and the horizontal member engaging portion of the steel tread is engaged with the horizontal member 22. The horizontal member 22 supports the load of the inner scaffold 3. As a modification, the inner scaffold 3 may be formed of a scaffold plate having another structure such as a wooden scaffold plate. The connector 24 is horizontally fixed to the outer surface (surface on the beam side) of the vertical column 21. The connection tool 24 includes locking means such as a gravity lock mechanism or fixing means, and engages with locking holes formed at both ends of the brace 13 and the handrail bar 14 (FIG. 9).

  The front end side guide member 25 is disposed at a connecting portion between the horizontal member 22 and the diagonal member 23, and is fixed to the lower side of the horizontal member 22. The proximal-side guide member 26 is interposed in the vertical column 21 below the horizontal member 22, and divides the vertical column 21 into an upper column 21a and a lower column 21b. The guide members 25 and 26 on the distal end side and the proximal end side form a hollow portion having a square cross section through which the slide member 4 having a square cross section (shown by an imaginary line) can be inserted, and the hollow portions of the guide members 25 and 26 are Are arranged at the same level and aligned in parallel with the horizontal member 22. The slide member 4 penetrating each guide member 25, 26 is in sliding contact with the inner surfaces of the guide members 25, 26 and slides parallel to the horizontal member 22. In order to hold the slide member 4 at a desired position, a relative position restricting means 27 is disposed on the proximal end side guide member 26. The relative position restricting means 27 includes a bolt that is screwed to the top wall of the base end side guide member 26 and a spring washer that engages the bolt head. The front end portion (lower end portion) of the bolt projects into the hollow portion of the base end side guide member 26 and engages or locks in a locking hole (not shown) formed on the upper surface of the slide member 4. The hollow portions of the slide member 4 and the guide members 25 and 26 may have other cross-sectional shapes such as a circular cross section.

  As shown in FIG. 11, the corner bracket 12 includes a vertical column 31, a horizontal member 32, a diagonal member 33, a connector 34, a distal end side guide member 35, and a proximal end side guide member 36. Since the corner brackets 12 are located at the corners of the temporary scaffold 1, the horizontal members 32 are arranged in pairs in the orthogonal direction. The diagonal members 33 are connected to the front ends of the horizontal members 32 and the lower ends of the columns 31. As with the horizontal member 32, the connector 34 and the guide member 35 are arranged in pairs in the orthogonal direction. A steel floor plate 38 having a substantially isosceles right triangle shape in plan view is fixed to the horizontal member 32, and the horizontal member 32 supports the load of the floor plate 38. The floor plate 38 forms a work floor continuous with the inner scaffold 3. The vertical column 31, the horizontal member 32 and the diagonal member 33 are made of steel pipes having a circular cross section, and are integrally connected by fixing means such as welding or bolts and nuts. If desired, a metal material having another cross-sectional shape such as a square cross-section may be used as the vertical column 31, the horizontal member 32, and the diagonal member 33. The coupler 34 includes a locking means such as a gravity lock mechanism that engages with the locking holes of the brace 13 and the handrail bar 14 or a fixing means. A wire connecting tool 30 that can connect the wire rope W <b> 1 is disposed on the top of the column 31. A wire connecting tool 39 that can lock a wire rod (not shown) of the beam locking tool is disposed on the support 31. A hook or shackle of the wire 7 (FIG. 1) for suspending the temporary scaffold 1 can be locked to the wire connector 39. As a modified example, the wire connecting tool 39 may be disposed at the tip of each horizontal member 32.

  The front end side guide member 35 is disposed at a connecting portion between the horizontal member 32 and the diagonal member 33 and is fixed to the lower side of the horizontal member 32. The proximal-side guide member 36 is interposed on the vertical support 31 below the horizontal member 32, and divides the vertical support 31 into an upper support 31a and a lower support 31b. Each of the guide members 35 and 36 on the distal end side and the proximal end side forms a hollow portion having a square cross section through which the slide member 4 having a square cross section (shown by an imaginary line) can be inserted, and the hollow portions of the respective guide members 35 are the same. It is arranged at the level and aligned in parallel with the horizontal member 32. The slide member 4 penetrating each guide member 35, 36 is in sliding contact with the inner surface of the guide member 35, 36 and slides parallel to the horizontal member 32. A relative position restricting means 37 for holding the slide member 4 at a desired position is disposed on the proximal end side guide member 36. The relative position restricting means 37 includes a bolt that is screwed to the top wall of the proximal guide member 36 and a spring washer that engages the bolt head. The front end portion (lower end portion) of the bolt projects into the hollow portion of the base end side guide member 26 and engages or locks in a locking hole (not shown) formed on the upper surface of the slide member 4. The hollow portions of the slide member 4 and the guide members 35 and 36 may have other cross-sectional shapes such as a circular cross section.

  FIG. 12 is a plan view, a side view, and a front view showing configurations of the slide member 4, the outer handrail 5, and the outer scaffold 6.

  The slide member 4 includes a horizontal slide tube 40 made of a steel pipe having a square cross section, a shackle 41 attached to the proximal end portion of the slide tube 40, a stepping plate pivoting mechanism 42 disposed at the distal end portion of the slide tube 40, and a handrail holding And a mechanism 43. The slide tube 40 has a uniform cross-sectional shape and a cross-sectional dimension that extend slidably through the hollow portions of the guide members 25, 26, 35, and 36 (FIGS. 10 and 11) of the brackets 11 and 12 over the entire length. The shackle 41 has an annular shape capable of locking a wire rod W4 (FIG. 13) such as a wire rope or a chain for sliding the slide tube 40. The handrail holding mechanism 43 includes a vertical tube portion 44 that extends upward from the tip of the slide tube 40. The fixed hinge member 45 is fixed to the vertical pipe portion 44, and the rotation shaft 46 is rotatably supported by the fixed hinge member 45.

  The outer scaffold 6 of this example includes a movable hinge member 47, a scaffold plate holder 61, a holder locking portion 62, a scaffold locking mechanism 63 and a scaffold plate 65. The upper end portion of the movable hinge member 47 is fixed to the rotating shaft 46, and the lower end portion of the movable hinge member 47 is fixed to the outer end portion of the scaffold plate holder 61. The holder 61 extends inward along the upper surface of the slide tube 40, and a holder locking portion 62 is formed at the inner end of the holder 61. The locking portion 62 includes a scaffold locking mechanism 63 that can be attached to and detached from the slide tube 40. The scaffold locking mechanism 63 is engaged with or detached from the slide tube 40 by manual operation. An end of a metal or wooden scaffold board 65 is inserted into the holder 61 as indicated by a virtual line, and the holder 61 holds the scaffold board 65.

  A handrail post (or handrail) 51 of the outer handrail 5 is inserted into the vertical tube portion 44. The handrail support column 51 extends upward from the vertical pipe portion 44, and the movable clamp member 52 and the fixed clamp member 53 are attached to the handrail support column 51. Steel pipes 54 and 55 (indicated by phantom lines) having a circular cross section are fastened to the handrail column 51 by the clamp members 52 and 53, and the outer handrail 5 is formed. A height holding pin 57 for holding the height of the handrail post 51 penetrates the vertical pipe portion 44 and the handrail post 51 horizontally. When the height holding pin 57 is pulled out from the vertical tube portion 44 and the handrail column 51, the handrail column 51 can move up and down by the guide of the vertical tube portion 44. The height holding pin 57 is connected to a flexible wire 58 for preventing falling, and the wire 58 is connected to the fixed hinge member 45. The movable clamp member 52 includes height fixing means 56. The height fixing means 56 functions to engage with the handrail column 51 and to fix the movable clamp member 52 to a predetermined position of the handrail column 51.

  The hinge members 45 and 47, the rotation shaft 46, the holder 61, the locking portion 62, the locking mechanism 63, and the scaffold plate 65 constitute the outer scaffold 6, and the vertical pipe portion 44, the handrail post 51, and the clamp members 52 and 53. The steel pipes 54 and 55 constitute the outer handrail 5.

  As shown in FIG. 9, the brackets 11 and 12 are interconnected by a brace 13, a handrail bar 14, a connecting member 15, and a fire striking member 16, and form a rectangular frame in plan view as shown in FIG. 8. 4 is inserted into the guide members 25, 26, 35, 36 of the brackets 11, 12.

  FIG. 13 is a side view showing a state in which the slide member 4 is attached to the bracket 11 (12).

  The slide tube 40 penetrates the distal end side guide member 25 (35) and the proximal end side guide member 26 (36), and the slide member 4 is located at the maximum projecting position that projects outward from the brackets 11 and 12 to the maximum extent. .

  A drop-off prevention tool 49 is attached to the proximal end portion of the slide tube 40. The dropout prevention tool 49 regulates the outward projecting position of the slide tube 40. The inner scaffold 3 and the outer scaffold 6 form work scaffolds for reinforcement work on both sides of the building beam B (shown by broken lines in FIG. 8). The inner scaffold 3 and the outer scaffold 6 may be used as work scaffolds for performing part of the formwork as well as the reinforcement work as desired. A wire rod W4 for moving the slide member 4 is engaged with the shackle 41 attached to the proximal end portion of the slide tube 40. In addition, the edge part of the brace 13 and the handrail bar | burr 14 latches to the connection tool 24 (34), and the connection material 15 is connected with the support | pillar 21 (31) by the clamp members 71 and 72. FIG. Further, the clamp member 73 is fixed to the distal end portion of the horizontal member 22 (32), and the connecting member 75 is connected to the distal end portion of the horizontal member 22 (32) by the clamp member 73.

  14 to 18 show a mode in which the slide member 4, the outer handrail 5, and the outer scaffold 6 are drawn into the in-span region into the frame body formed by the bracket 11 (12).

  When the height holding pin 57 is pulled out from the vertical pipe portion 44 and the handrail support 51 and the movable clamp member 52 is fixed by the height fixing means 56, the handrail support 51 is lowered to the lowest position as shown in FIGS. Descent to position.

  When the locking mechanism 63 is released to disengage the locking mechanism 63 from the slide tube 40 and the holder 61 is rotated upward about the rotation shaft 46 (FIG. 16), the scaffold plate 65 is held. It stands up with the tool 61 at the tip of the slide tube 40 (FIG. 17).

  When the wire W4 such as a wire rope is locked to the shackle 41 and the wire W4 is pulled toward the inside of the frame, the slide member 4, the outer handrail 5 and the outer scaffold 6 are relatively inward of the frame 11 with respect to the bracket 11 (12). Moving. The outer handrail 5 lowered to the lowest position does not interfere with the beam B, and the holding tool 61 and the scaffold plate 65 rotated upward do not interfere with the inner scaffold 3. Therefore, the slide member 4 is shown in FIG. As shown, the handrail holding mechanism 43 slides toward the inside of the frame until it comes into contact with the clamp member 73 and stops.

  In addition, what is necessary is just to perform operation of the procedure contrary to the above-mentioned work procedure, in order to make the slide member 4, the outer side handrail 5, and the outer side scaffold 6 protrude outside a frame.

  FIG. 19 is a schematic plan view illustrating a means for pulling the slide member 4 toward the inside of the frame.

  As shown in FIG. 19, the wire W4 is locked to the shackle 41 in the vicinity of the bracket 12. A traction device 90 such as a lever block or chain block is disposed on the opposing inner scaffold 3. The wire rods W4 on both sides are locked to the pulling portion W5 of the pulling device 90. When the traction device 90 is driven and a traction force is applied to the wire W6 of the traction device 90, the wire W4 pulls the slide member 4 toward the inside of the frame.

  FIG. 20 is a schematic plan view illustrating a means for causing the slide member 4 to protrude outward from the frame body.

  As shown in FIG. 20, a wire turning mechanism 91 such as an idler pulley or a roller is disposed at a predetermined position of the temporary scaffold 1. The wire W4 locked to the shackle 41 goes around the turning roller 91 and is locked to the pulling portion W5 of the pulling device 90. When the traction device 90 is driven and a traction force is applied to the wire W6 of the traction device 90, the wire W4 pulls the slide member 4 outward from the frame body.

  FIG. 21 is a schematic plan view showing the opening / closing operation of the curing net stretched in the central opening region of the temporary scaffold.

  As shown in FIG. 8, the frame of the temporary scaffold 1 is reinforced by a horizontal fire material 16, and an opening having a relatively large area is formed at the center of the temporary scaffold 1. By using this central opening region, vertical conveyance of construction materials and the like can be performed. On the other hand, a curing net 9 for preventing fall is stretched as a safety measure in the central opening region. FIG. 21 schematically shows means for opening and closing the curing net 9 to open the central opening region.

  As shown in FIG. 21, linear members 95 for guiding the net are respectively installed on the edges on both sides of the central opening region. A large number of fasteners 96 associated with the linear member 95 are attached to the edges on both sides of the curing net 9 at a predetermined interval. As the fastener 96, an annular member such as a ring through which the linear member 95 can be inserted can be exemplified. The fastener 96 is movably supported by the linear member 95.

  When one end of the curing net 9 is pulled inward as indicated by an arrow in FIG. 21A, the curing net 9 opens the central opening region as shown in FIGS. 21B and 21C.

  FIG. 22 is a side view showing a modification of the outer scaffold 6.

  In the above-described embodiment, the outer scaffold having a structure that can rotate upward has been described. However, the outer scaffold 6 may be configured to have a foldable structure as shown in FIG. As shown in FIG. 22, the outer scaffold 6 having such a structure is bent when the slide member 4 is pulled, and is compactly stored in the vicinity of the handrail 5. In the configuration shown in FIG. 22, the distal end portion of the skew guide rod 92 is articulated to the lower end portion of the handrail support column 51, and the proximal end portion of the guide rod 92 penetrates the lower end portion of the support column 21. At the base end of the guide rod 92, a stopper 93 for preventing the drop is provided. The stopper 93 releases the locked state of the guide rod 92 and the support column 21 by manual operation of the manual release mechanism 94, and the slide member 4 can be retracted inward as shown in FIG.

  The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the above-described embodiments, and various modifications or changes can be made within the scope of the present invention described in the claims. Is possible.

  For example, a buffer means such as a ski member or guide means may be provided on the outer periphery of the temporary scaffolding to prevent the temporary scaffolding from contacting the beam or the like when moving up and down, or to restrict the swinging of the temporary scaffolding. good.

  Also, the lifting / conveying equipment for raising and lowering the temporary scaffolding is not limited to cranes, but the temporary scaffolding can be raised and lowered by a lifting / conveying equipment such as a winch supported by beams on the top floor or upper floor. Also good.

  In addition, the structure of each component, such as using a handrail column with a telescopic structure or telescoping structure as an outer handrail, configuring the outer scaffold as a lifting or sliding type, or configuring the slide tube as a telescopic type, etc. The design can be appropriately changed.

  The construction method of the present invention is particularly applied to a construction method for a building having a steel-frame structure. By applying the present invention, it is possible to form work scaffolds for bar arrangement work on both sides of the steel beam on each floor without using a conventional suspension frame scaffold such as a pie hanger.

  Further, the temporary scaffold of the present invention is preferably used as a temporary scaffold used in such a construction method, particularly for the construction of a steel-steel reinforced structure. The temporary scaffold is moved up and down in the span area, and work scaffolds for reinforcing steel beams on each floor are sequentially formed according to the progress of the construction.

  In addition, the construction method and the temporary scaffold applicable to the construction method of the present invention are not necessarily limited to buildings, and the present invention is similarly applied to civil engineering works or plant construction works or the like. It can be used.

It is sectional drawing which shows the construction method of the building which concerns on this invention notionally, and the state which completed the reinforcement construction of the steel column of a lower floor and a steel beam is shown. It is sectional drawing which shows the state which retracted the part of the temporary scaffold projected on the other side of a beam to the area | region in a span. It is sectional drawing which shows the state which raised the temporary scaffold to the upper floor. It is sectional drawing which shows the state which projects a temporary scaffold on the outer side of the beam of an upper floor. It is sectional drawing which shows the state which generally completed the reinforcement work of the steel frame column and steel beam of an upper floor. It is sectional drawing which shows the state which retreats the part of the temporary scaffold projected on the opposite side of the beam in the upper floor to the area | region in a span. It is sectional drawing which shows the state which raises a temporary scaffold further to the upper floor. It is a top view which shows the whole structure of a temporary scaffold. It is sectional drawing in the II line | wire of FIG. It is the top view which shows the structure of a standard bracket, a front view, a side view, and a rear view. It is the top view and side view which show the structure of a corner bracket. It is the top view which shows the structure of a slide member, an outer side handrail, and an outer side scaffold, a side view, and a front view. It is the top view and side view which show the state which attached the slide member to the standard bracket. It is a side view which shows the aspect which draws in a slide member, an outer side handrail, and an outer side scaffold to the area | region in a span, and the descent | fall process of a handrail support | pillar is shown. It is a side view which shows the state which lowered the handrail support | pillar to the lowest position. It is a side view which shows the process of rotating an outer side scaffold upwards. It is a side view which shows the process of pulling a slide member inside a temporary scaffold. It is a side view which shows the state which pulled the slide member, the outer handrail, and the outer side scaffold completely in the inside of a frame. It is a schematic plan view which illustrates a means which pulls a slide member toward the inside of a frame. It is a schematic plan view which illustrates the means to make a slide member protrude outside a frame. It is a schematic plan view which shows the opening / closing operation | movement of the curing net stretched by the center opening area | region of the temporary scaffold. It is a side view which shows the modification of an outer side scaffold. It is sectional drawing which shows the structure of the conventional suspension frame scaffold roughly. It is the top view and sectional drawing which show schematically the structure of the conventional raising / lowering type temporary scaffold.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Temporary scaffold 2 Frame 3 Inner scaffold 4 Slide member 5 Outer handrail 6 Outer scaffold 7 Wire material 8 Beam locking tool 9 Curing net 11 Standard bracket 12 Corner bracket 13 Brace 14 Handrail bar 15 Connecting material 16 Fire striking material 21, 31 Vertical support 22, 32 Horizontal member 23, 33 Diagonal member 24, 34 Connector 25, 35 Front end side guide member 26, 36 Base end side guide member 40 Horizontal slide tube 41 Shackle 42 Tread plate pivoting mechanism 43 Handrail holding mechanism C Steel column B Steel beam G Span area J Rebar

Claims (13)

In a construction method using a temporary scaffold that can be raised and lowered, comprising a frame suspended in the span area between the beams by the lifting means, and a work scaffold formed in the outer peripheral area of the frame,
The scaffolding plate support member arranged on the frame body is projected from the lower beam region to the opposite side of the beam, and the scaffolding plate is supported by the protruding portion of the support member that is projected to the opposite side of the beam. With the working scaffold in the frame outer periphery region, a working scaffold is formed on both sides of the beam,
A construction method according to claim 1, wherein the support member is pulled into the span inner region, the support member and the scaffold plate are retracted to the span inner region, and the temporary scaffold is moved up and down.   A handrail that can be displaced downward or deformed when the scaffold plate support member protrudes or retracts is disposed at a distal end portion of the support member, and the handrail is formed on a work scaffold opposite to the beam. The construction method according to 1.   The scaffold plate is displaced or deformed with respect to the support member when the scaffold plate support member is retracted to prevent the scaffold plate from interfering with the work platform in the outer peripheral region, and the level of the work platform on both sides of the beam The construction method according to claim 1 or 2, wherein substantially the same is set.   An opening region is formed in a central portion of the frame body, a curing net that can be opened and closed is stretched over the opening region, and the curing net is opened to form a vertical conveyance path for construction materials. The construction method according to any one of 1 to 3. In a temporary scaffold for construction work having a frame suspended in a span inner region between beams by a lifting means, and a work scaffold formed in an outer peripheral region of the frame, and arranged to be lifted and lowered in the span inner region ,
A scaffolding plate support member that is drawn into the span area when the temporary scaffold is raised and lowered, and projects to the opposite side of the beam from the lower beam area at the work level;
A temporary scaffold for construction having a scaffold plate supported by the protruding portion of the support member.   A handrail is disposed at the distal end portion of the scaffold plate support member, and handrail retraction means is provided for displacing or deforming the handrail downward when the support member protrudes into the outside span region or is pulled into the inside span region. The temporary scaffold according to claim 5.   The scaffolding plate retracting means for displacing or deforming the scaffolding plate with respect to the scaffolding plate support member and enabling the scaffolding plate to be retracted to an in-span region when the support member is retracted. Temporary scaffolding as described in   The frame includes a plurality of brackets each having a vertical column and a horizontal horizontal member, a scaffolding plate in an outer peripheral region of the frame that is installed on the horizontal member, and a connecting material that interconnects the columns of adjacent brackets. The temporary scaffold according to any one of claims 5 to 7, wherein the temporary scaffold is formed.   The temporary scaffold according to any one of claims 5 to 8, wherein a curing net capable of opening and closing the opening region is stretched in an opening region formed in a central portion of the frame body.   The handrail includes a handrail strut holding mechanism fixed to a distal end portion of the scaffold plate support member, a vertical handrail strut supported by the handrail strut holding mechanism, and a handrail for fixing the handrail strut to the handrail strut holding mechanism. The handrail support means and the handrail strut fixing means constitute the handrail retracting means, and the handrail strut is formed of the handrail support means. The temporary scaffold according to claim 6, wherein the temporary scaffold is lowered by guidance of the handrail support mechanism.   The scaffold retracting means includes a fixed member fixed to a distal end portion of the scaffold plate support member, and a movable hinge member pivoting with respect to the fixed member, and the movable hinge member is the scaffold plate or its holding The temporary scaffold according to claim 7, wherein the temporary scaffold is integrally connected to an outer edge portion of the implement.   The bracket has a hollow guide member through which the scaffold plate support member can be inserted, and the outer shape of the scaffold plate support member and the hollow portion of the guide member have a square cross section, and the outer surface of the scaffold plate support member 9. The temporary scaffold according to claim 8, wherein the temporary scaffold is in sliding contact with the inner surface of the guide member. The temporary scaffold according to any one of claims 5 to 12, wherein the frame body has wire rod turning means for turning a wire rod that pulls the scaffold plate support member.

Images