JP5097313B2 - Suspended scaffold and its installation method - Google Patents

Description

  The present invention relates to a suspension scaffold and a construction method thereof, and more particularly to a suspension scaffold attached as a fall protection work to a bridge such as a viaduct, an elevated road, and an elevated railway, and a construction method thereof.

  A suspension scaffold attached to a bridge is known as a fall protection work for high-altitude work. As a method of constructing this type of suspension scaffolding, a grounding construction method in which a frame scaffolding having a certain floor area is assembled on the ground, and then the framework scaffolding is lifted by a lifting means such as a crane truck and installed at a predetermined position on the pier. Is disclosed in JP-A-9-273120.

  In Japanese Patent Publication No. 3-12172, after attaching a hoist rail to the main girder, a small divided scaffold assembled on the ground is lifted to the main girder level by a hoist and fixed to the main girder. Is repeated, and a large number of divided scaffolds are connected vertically and horizontally, and thereby a ground construction method for mounting a wide range of suspended scaffolds on a bridge is described.

  Furthermore, Japanese Patent Laid-Open No. 2000-54619 discloses that a suspension scaffold with a relatively wide area is grounded at the ground level using a truss beam, and the suspended scaffolding after the grounding is suspended on a steel girder. The method of building the scaffold is described. As shown in FIG. 8, after the suspension scaffold R is pre-assembled on a platform S such as a framework cart in the ground work area Q (work occupation band, etc.) between the piers V, which does not hinder traffic, as shown in FIG. (Fig. 8 (A)), the suspension scaffold is moved to the installation point by the gantry S (Fig. 8 (B)), and the suspension scaffold R of the steel girder T is moved by a lifting machine U such as a winch attached to the steel beam T of the viaduct. The system is lifted to a level (FIG. 8C) and then attached to a steel girder T.

  Similarly, the suspended scaffolding R ′ connected to the suspended scaffolding R is also grounded at the ground level, moved to the construction point, and lifted to the level of the steel beam T by the lifting machine (FIG. 8 (D)). Attached to the girder T. As shown in FIG. 9, the suspended scaffold R (R ′) has a truss beam R1 arranged in parallel, a floor board material R2 laid on the beam R1, and a morning glory R3, a reinforcing rod R4, etc. on the outer edge of the floor. It has an assembled structure.

  After completion of all height work or bridge construction, the suspension scaffolds R and R 'are lowered to the ground level by the lifting machine U, disassembled and removed as shown in FIGS. 8 (E) and 8 (F). The

As another type of suspension scaffold, there is known a structure in which a scaffold panel is suspended directly on a bridge girder or the like by a rope such as a chain (Japanese Patent No. 2647801). This scaffold panel has a composite panel structure in which a step plate such as a striped steel plate is attached to a frame body, and has a relatively high bending rigidity.
JP-A-9-273120 Japanese Patent Publication No. 3-12172 JP 2000-54619 A Japanese Patent No. 2647801

  According to the construction method of a suspended scaffold (Patent Document 3 (Japanese Patent Laid-Open Publication No. 2000-54619)) in which a scaffold with a relatively wide area is preliminarily constructed on the ground using a truss beam, the suspended scaffold is formed at a high place. The number of man-hours for high-level work to be constructed is greatly reduced, and not only the safety of the whole work is improved, but also the work time of lifting work is considerably shortened. For this reason, it is possible to reduce the time for traffic regulation or the like for blocking traffic during the lifting work, and to reduce the influence of construction on the transportation.

  In such a groundwork method, it is possible to employ a composite panel-structured scaffolding plate described in Patent Document 4 (Japanese Patent No. 2647801) and to support a number of scaffolding plates with a truss beam. Scaffolding panels with a composite panel structure have relatively high bending rigidity, so the support interval (span between fulcrums) by the truss beam can be expanded, reducing the number of truss beams and simplifying the assembly work It is possible to reduce the work man-hours and reduce the construction costs.

  However, in such a suspended structure scaffolding method, it is not possible to dismantle and remove the truss-like beam alone, such as a truss-like beam at an early stage. Will continue to be erected under the steel girder until the entire construction is completed, and as shown in FIGS. 8E and 8F, it will be lowered to the ground as a whole, disassembled and removed.

  For this reason, considering the case where the construction range (work zone) of bridge construction is expanded or the case where similar work is carried out simultaneously in another construction range (work zone), a large number of horizontal members for ground structures, It becomes necessary to prepare in advance as a temporary material a large number of auxiliary members, fasteners, and other members and parts that are attached or assembled to the material. However, the procurement and use of a large number of horizontal members and related materials causes problems such as the expansion of the temporary material storage area and the increase in temporary construction costs.

  In addition, even if horizontal materials and related materials are required at other construction sites due to such circumstances, only the horizontal materials and related materials should be used at other construction sites before the completion of construction. It cannot be diverted.

  The present invention has been made in view of such circumstances, and the object of the present invention is to enable early diversion of horizontal members for construction and related materials to other construction zones and construction sites. At the same time, it is an object of the present invention to provide a suspension scaffold and its construction method capable of reducing the procurement amount of horizontal members for ground structures and related materials, reducing the temporary material storage area, and reducing temporary construction costs.

In order to achieve the above object, the present invention is a suspension scaffold comprising a plurality of scaffolding plates and a horizontal member that can be lifted and lowered, and the horizontal member is raised by a rope connected to a lifting machine. more it is raised to the overall aerial level, in suspension scaffolds land set method which is attached to the construct or the construction thereof,
The scaffolding plate is releasably connected to the horizontal member in order to suspend the scaffolding plate and to suspend the scaffolding plate below the horizontal member by a plurality of the horizontal members . A suspension (5) for releasing the connection between the scaffolding plate and the horizontal member to remove the horizontal member at a work level ;
After rising to totally the aerial level the hanging scaffold by the upper traction of the rope by the crane, suspension means for suspending the scaffolding plate to the construct or construction thereof in the aerial level A suspended scaffold characterized by (8,2g, 3g, 2c, 3c) is provided.

The present invention also lays a suspension scaffold that can be lifted and lowered by a plurality of scaffolding plates and a horizontal member, raises the horizontal member by a rope connected to a lifting machine, and makes the suspension scaffold as a whole high In the construction method of the suspension scaffold attached to the structure or construction at the work level,
The scaffolding plate is suspended below the horizontal member by a suspension that releasably connects the scaffold plate to the horizontal member,
The hoist is pulled up by the hoist to raise the suspension scaffold as a whole to the high work level,
Suspend the scaffolding board to the structure or construction,
A suspension scaffold construction method is provided, wherein the suspension member is released to remove the horizontal member.

  According to the said structure of this invention, a horizontal member is a thing of the reverse beam shape located in the upper side of a scaffold board. Therefore, the horizontal member is exposed to the working floor of the suspension scaffold that has been raised to a high level. Moreover, since the scaffolding plate is suspended from the structure or the construction by the suspension means after being lifted, the weight of the scaffolding plate and the load load are supported by the structure or the construction. Therefore, the worker on the suspension scaffold can dismantle and remove the horizontal member and its related members / parts etc. at an early stage after the suspension scaffold is raised.

  Therefore, according to the suspension scaffold of the above configuration and its temporary construction method, when expanding the construction range (work zone) of the bridge construction or when the same work is simultaneously advanced in another construction range (work zone), etc. It is possible to quickly move and divert horizontal members for construction to construction zones, construction sites, and related materials. This is extremely advantageous in reducing the procurement quantity of horizontal members for ground structures and related materials, reducing the temporary material storage area, and reducing temporary construction costs.

  According to the suspension scaffold and its erection method of the present invention, it is possible to divert the horizontal member for construction and its related materials to other work areas, construction sites, etc. at an early stage. Moreover, according to the suspension scaffold and its construction method of the present invention, it becomes possible to reduce the procurement amount of the horizontal members for the groundwork and related materials, reduce the temporary material storage area, reduce the temporary construction cost, and the like. .

  In a preferred embodiment of the present invention, the suspension (5) is supported by a frame (51) having an opening (52) through which the horizontal member (4) can pass, and the frame. A scaffold plate suspension member (56). The frame is releasably fixed to the horizontal member. Preferably, the scaffolding plate suspension member (56) has a cross section that passes through and supports the frame portion of the scaffolding plate.

  In a further preferred embodiment of the present invention, the suspension means comprises a rope (8) moored to a structure or a construction, and a scaffolding plate support (2g, which can lock the lower end of the rope). 3g, 2c, 3c). Preferably, the support portion includes an opening (2g, 3g) formed in the working floor of the scaffolding plate, and a receiving member (2c) disposed below the flooring and connected to the frame of the scaffolding plate. 3c).

  Preferably, as the scaffolding plate, a scaffolding plate having a composite panel structure having a configuration that can be interconnected by the coupling portions (2e, 3e) is used, and adjacent scaffolding plates are connected to the projections for coupling one scaffolding plate and the other. Are connected to each other by, for example, insertion into a receiving opening of the scaffold plate. More preferably, the fabric direction of the scaffold plate is parallel to the direction of the horizontal member, and the reinforcing members (80, 81) for reinforcing the work floor by interconnecting the scaffold plates are arranged in a direction orthogonal to the horizontal member. Is done.

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

  FIGS. 1 and 2 are a plan view, a front view, and a side view showing the overall structure of a suspended scaffold assembled according to the present invention.

  The suspended scaffold 1 is composed of a large number of scaffolding plates 2 and 3 for forming a working floor, a plurality of horizontal members 4 disposed horizontally above the scaffolding plates 2 and 3, and scaffolding plates 2 and 3. It is mainly composed of a suspension tool 5 for suspending the material 4 underneath, and a hanging metal fitting 6 for lifting the horizontal material 4 by a rope 7 of a lifting machine.

  As shown in FIG. 1 (B) and FIG. 1 (C), the scaffold plates 2 and 3 are scaffold plates having a composite panel structure. The frame of the scaffolding plates 2 and 3 includes left and right cloth frames 2a: 3a, parent frames 2b: 3b at both ends, receiving members 2c: 3c extending in the cloth frame direction, and reinforcement parallel to the parent frames 2b: 3b. It consists of material 2d: 3d and connection part 2e: 3e for mutually connecting scaffolding boards. The connecting portions 2e: 3e are fitted into the open ends of the parent frames 2b: 3b of the adjacent scaffold plates 2, 3. The flooring of the scaffolding plates 2 and 3 is composed of striped steel plates 2f: 3f that are integrally attached to the frame. The scaffold board 2 has a length of about 4 m (dimension in the cloth direction), and the scaffold board 3 has a length of about 2 m (dimension in the cloth direction).

  The scaffolding plates 2 and 3 are arranged vertically and horizontally, and the striped steel plates 2f: 3f form a substantially continuous horizontal work floor on the suspended scaffolding 1. A plurality of openings 2g: 3g are formed in the striped steel plates 2f: 3f immediately above the receiving material 2c: 3c. The openings 2g: 3g and the receiving members 2c: 3c constitute suspension means for suspending the scaffolding plates 2, 3 to the bridge steel beam T (FIG. 6) together with the rope 8 (FIG. 7) described later. To do.

  3 (A), 3 (B) and 3 (C) are a plan view, a front view and a bottom view showing the structure of the horizontal member 4, and FIG. 3 (D), FIG. 3 (E) and FIG. FIG. 3F is a plan view, a front view, and a side view of the groove-shaped reinforcing member 42.

  As shown in FIGS. 3 (A), 3 (B), and 3 (C), each horizontal member 4 includes a plurality of rectangular steel pipes having substantially the same length as the scaffolding plates 2 and 3, and connecting portions 41. 1 and a structure connected in series. The connecting portion 41 includes a socket-type connecting means for inserting a core member (not shown) protruding from one square steel pipe into the open end of the other square steel pipe, and a groove-shaped reinforcing bracket 42 for reinforcing the connection of the square steel pipe. Consists of The structure of the reinforcing metal fitting 42 is shown in FIGS. 3D, 3E, and 3F. The reinforcing metal fitting 42 includes a grooved steel member 43 that receives the ends of adjacent rectangular steel pipes from below and bridges the ends of the rectangular steel pipes, and a bolt / nut assembly 44 that penetrates the rectangular steel pipes and the grooved steel members 43. It consists of.

2
As shown in FIGS. 3 (A), 3 (B), and 3 (C), the suspension 5 is placed at a predetermined position on the horizontal member 4 so as to suspend the ends of the scaffolding plates 2 and 3. The hanging metal fittings 6 are arranged at positions (in this example, the center and both ends of the horizontal member 4) in consideration of the horizontal balance of the horizontal member 3 at the time of lifting.

  4A, 4B, and 4C are a front view, a side view, and a bottom view showing the structure of the suspension tool 5, respectively.

  The suspension 5 includes a frame body 51 that forms a rectangular opening 52 through which the horizontal member 4 can be inserted, a bolt / nut assembly 53 that horizontally penetrates the frame body 51, and a pair of suspensions hanging from the frame body 51. Bracket 54, bolt / nut assembly 55 penetrating bracket 54, scaffold plate suspension member 56 supported on the shaft portion of bolt / nut assembly 55, and mooring that prevents dropping of scaffold plate suspension member 56 And a member 57.

  The scaffold board suspension member 56 is made of a metal member having a U-shaped cross section through which the parent frames 2b and 3b (indicated by phantom lines) of the scaffold boards 2 and 3 can be inserted. The parent frames 2b and 3b are made of a steel pipe having a circular cross section, and the radius of curvature of the inner peripheral surface of the lower end curved portion of the scaffolding plate suspension member 56 is set to a dimension that substantially matches the radius r of the parent frames 2b and 3b. .

  As shown in FIG. 2, the suspension member 5 is attached to the horizontal member 4 by fastening the bolt / nut assembly 53 with the horizontal member 4 inserted through the opening 52. The parent frame 2 b or the parent frame 3 b inserted through the scaffold plate suspension member 56 is suspended from the horizontal member 4 by the suspension tool 5. The adjacent parent frame 2b and the parent frame 3b are tightened by the universal clamp 58, and the reinforcing single tube 80 is tightened to the lower side of the parent frame 2b or the parent frame 3b by the universal clamp 59. The single tube 80 extends in a direction orthogonal to the horizontal member 4. Adjacent parent frames 2b and 3b are also fastened to each other by a universal clamp 31 (FIG. 1).

  As shown in FIG. 1, a reinforcing single pipe 81 is disposed on the upper side of the scaffolding plate 2 and extends in parallel with the single pipe 80. The single pipe 81 is fastened to the receiving material 2c of the scaffolding plate 2 by the clamp member 82. As shown in FIG. 2, a pipe 71 is fastened by a clamp member 72 to the single pipe 81 near the outer edge of the bridge without the morning glory 70. The morning glory 70 has a structure in which a building pipe 73 and a cloth pipe 74 are assembled vertically and horizontally, and a lower end portion of the building pipe 73 is fastened to an outer end portion of the scaffolding plate 2 by a clamp member. A curing net (not shown) is stretched on the outer surface of the morning glory 70.

  5A, 5B, and 5C are a front view, a side view, and a cross-sectional view showing the structure of the hanging metal fitting 6, respectively.

  The hanging metal fitting 6 is erected vertically on a frame body 61 that forms an opening 62 through which the horizontal member 4 can be inserted, a bolt / nut assembly 63 that horizontally penetrates the frame body 61, and an upper surface of the frame body 61. Bracket 64. A through-hole 65 through which the rope 7 (FIG. 2) such as a chain, a wire, or a rope can be inserted is formed at the center of the bracket 64.

  As shown in FIG. 2, the hanging metal fitting 6 is fixed to the horizontal member 4 by fastening a bolt / nut assembly 63 with the horizontal member 4 inserted through the opening 62. The bracket 64 protrudes vertically upward from the frame body 61. The lower end portion of the rope 7 is moored to the bracket 64. The rope 7 is wound up by a lifting machine such as a winch disposed on a steel girder or the like of a bridge, and pulls the suspension fitting 6 vertically upward as indicated by an arrow.

  6 and 7 are schematic front views showing stepwise the process of erection of the suspension scaffold having the above configuration as a drop protection work for bridge construction.

  FIG. 6 shows a construction method for constructing the suspension scaffold 1 on the steel girder T of the bridge.

  The suspension scaffold 1 is laid on a platform S such as a frame carriage in a ground work area Q (work occupation band, etc.) between piers V that does not hinder traffic (FIG. 6A). The gantry S on which the suspended scaffolding 1 after the grounding is loaded is moved to the erection point (FIG. 6B). A lifting machine U such as a winch is attached to the steel bridge T of the viaduct, and the lower end portion of the rope 7 of the lifting machine U is moored to the hanging metal fitting 6 of the horizontal member 4. This state is shown in FIG. As indicated by arrows in FIG. 7A, the traction force of the lifting machine U acts on the horizontal member 4, and the suspension scaffold 1 ascends as a whole.

  When the suspension scaffold 1 is lifted to the level of the steel girder T (FIG. 6 (C)), as shown in FIG. 7 (B), the rope 8 such as a chain moored to the steel girder T is attached to the scaffold plates 2 and 3. Locked. The lower end portion of the rope 8 is locked or wound around the receiving material 2c: 3c through the openings 2g: 3g of the scaffolding plates 2, 3, or is a ring material previously attached to the receiving material 2c: 3c. Etc. The suspension scaffold 1 is supported by the rope 8 by stopping the lifting machine U and releasing the tension of the rope 7. At this time, the working floors of the scaffold plates 2 and 3 are formed. The worker on the work floor uncouples the rope 7 from the hanging bracket 6 and disassembles the suspension 5 to uncouple the suspension 5 from the scaffolding plates 2, 3. The material 4 can be dismantled and removed. The disassembled and removed horizontal member 4 is lowered to the ground by a lifting machine U or the like.

  After the work floors of the scaffold plates 2 and 3 are thus constructed on one side of the bridge (FIG. 6D), the opposite suspension scaffold 1 ′ is lifted by the same work procedure (FIG. 6E )), The scaffolding plates 2 and 3 are locked to the rope 8, the horizontal member 4 is disassembled and removed, and thus the suspended scaffolds 1 and 1 'are constructed over the entire lower side of the steel girder T (FIG. 6). (F)).

  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, although the said Example is related with construction of the suspension scaffold of the steel girder side part which has a morning glory, this invention is applicable similarly also to the suspension scaffold of the intermediate part which does not have a morning glory.

  Further, the suspension scaffold of the above embodiment uses a horizontal member made of a square steel pipe or a structural steel pipe, but a truss beam, H-shaped steel, C-shaped steel or the like may be used as a horizontal member. good.

  The present invention is applied to a suspension scaffold attached as a fall protection work to a bridge such as a viaduct, an elevated road, and an elevated railway, and a construction method thereof. According to the suspension scaffold and its erection method of the present invention, it is possible to quickly convert the horizontal member for groundwork and related materials to other work zones, construction sites, etc. Since it is possible to reduce the procurement amount of materials, reduce the temporary material storage area, reduce temporary construction costs, etc., the practical effect is remarkable.

It is a top view which shows the whole structure of the suspension scaffold grounded according to this invention. It is the front view and side view which show the whole structure of the suspension scaffold shown in FIG. FIG. 3 is a plan view, a front view and a bottom view of the horizontal member showing the structure of the horizontal member shown in FIGS. 1 and 2 and its groove-shaped reinforcing member, and a plan view, a front view and a side view of the groove-shaped reinforcing member. FIG. 3 is a front view, a side view, and a bottom view of the suspension tool shown in FIGS. 1 and 2. FIG. 3 is a front view, a side view, and a cross-sectional view of the hanging metal fitting shown in FIGS. 1 and 2. It is a schematic front view which shows the process of constructing the suspension scaffold based on this invention as a fall protection work of bridge construction in steps. It is a front view of the suspension scaffold which shows only the main process in detail regarding the construction method of the suspension scaffold which concerns on this invention. It is a schematic front view which shows the process of the conventional suspension scaffolding method of construction in steps. It is a fragmentary perspective view of the suspension scaffold which shows roughly the structure of the conventional suspension scaffold using a truss beam.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Suspension scaffold 2 Scaffold board 3 Scaffold board 4 Horizontal material 5 Suspension tool 6 Suspension metal fitting 7 Line 8 Line

Claims (8)

A plurality of scaffolding plate and hanging scaffolds comprising a horizontal member and vertically movable Chigumi, more to increasing the horizontal member by a rope which is connected to the crane, overall aerial level In the suspended scaffolding of the earthwork method that is raised to
The scaffolding plate is releasably connected to the horizontal member in order to suspend the scaffolding plate and to suspend the scaffolding plate below the horizontal member by a plurality of the horizontal members . A suspension (5) for releasing the connection between the scaffolding plate and the horizontal member to remove the horizontal member at a work level ;
After rising to totally the aerial level the hanging scaffold by the upper traction of the rope by the crane, suspension means for suspending the scaffolding plate to the construct or construction thereof in the aerial level A suspended scaffold characterized by (8,2g, 3g, 2c, 3c).   The suspension (5) includes a frame (51) having an opening (52) through which the horizontal member (4) can pass, and a scaffold plate suspension member (56) supported by the frame. The suspension scaffold according to claim 1, wherein the frame body is releasably fixed to the horizontal member.   The suspension scaffold according to claim 2, wherein the scaffold board suspension member (56) has a cross section through which the frame portion of the scaffold plate is inserted and supported.   The suspension means includes a rope (8) moored to the structure or the construction, and a support portion (2g, 3g, 2c, 3c) of the scaffold plate capable of locking the lower end of the rope. The suspension scaffold according to any one of claims 1 to 3, wherein the suspension scaffold is configured.   The support portion includes openings (2g, 3g) formed in the working floor of the scaffold plate, and receiving members (2c, 3g) disposed below the floor material and connected to the frame of the scaffold plate. The suspension scaffold according to claim 4, wherein the suspension scaffold is composed of 3c). A suspension scaffold that can be moved up and down by a plurality of scaffolding plates and a horizontal member is assembled, and the horizontal member is lifted by a rope connected to a lifting machine, and the suspended scaffold is constructed at a high work level as a whole. In the construction method of the suspension scaffold attached to the construction,
The scaffolding plate is suspended below the horizontal member by a suspension that releasably connects the scaffold plate to the horizontal member,
The hoist is pulled up by the hoist to raise the suspension scaffold as a whole to the high work level,
Suspend the scaffolding board to the structure or construction,
The suspension scaffold is constructed by releasing the suspension and removing the horizontal member.   The construction according to claim 6, wherein a scaffolding plate having a composite panel structure having a configuration that can be interconnected by a connecting portion (2e, 3e) is used as the scaffolding plate, and the scaffolding plates are interconnected. Method.   The cloth direction of the scaffold plate is parallel to the direction of the horizontal member, and reinforcing members (80, 81) for reinforcing the work floor by interconnecting the scaffold plates are arranged in a direction orthogonal to the horizontal member. 8. The erection method according to claim 7, wherein the erection method is performed.

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