JP6243734B2 - Temporary draft shield unit - Google Patents

Description

  The present invention relates to a temporary windshield unit, and more specifically, in an altitude work such as installing a temporary windshield unit on an aerial structure such as a bridge, or in an elevated work such as moving or inspecting a temporary windshield unit. The present invention relates to a temporary draft shield unit that improves the safety and workability of workers.

  In construction work for constructing an aerial structure such as a steel bridge, a windshield is installed in the aerial structure in order to prevent work such as welding work from being affected by weather such as wind and rain. As a windshield facility, a temporary windshield unit is known which is lifted by a lifting machine such as a crane in a gate-like assembled state on the ground and installed on an aerial structure (Patent Document 1: Japanese Patent Laid-Open No. 2002-227404). ). The temporary draft shield unit installed on the aerial structure is moved along the aerial structure while being lifted by a lifting machine, or is lowered to the ground from the aerial structure and dismantled.

  As described in Patent Document 1, a conventional temporary windshield unit is constructed by assembling a steel frame by integrally assembling steel materials, and attaching a sheet or panel material to the outer surface of the frame to cover the entire outer surface. It is formed. The gate-shaped windshield unit assembled on the ground is positioned above the aerial structure while being lifted by a lifting machine, and then lowered so as to surround the upper surface and the side surface of the aerial structure. A working chamber or working space for bolt connection or the like is formed at a specific part of the aerial structure.

  When welding work at a specific part of the aerial structure is completed, the draft shield unit is moved along the aerial structure in a suspended state by a lifting machine or the like, and a work room or work space for welding work is installed in the aerial structure. Form in other parts of the object.

  On the other hand, a framework scaffold is known as a temporary scaffold used for construction work of a building or a civil engineering structure. The frame scaffolding is built on the outer wall of the building by building the building frame and laying the floored cloth frame on each layer of the building frame as a working scaffold board, and is dismantled at an appropriate time just before the completion of the construction work The

  The present applicant is able to construct a temporary draft shield unit by constructing the steel framework using the building frame and the fabric frame of the framework scaffolding, attaching a panel material to the outer surface of the framework, and covering the entire outer surface. Already demonstrated. This type of temporary draft shield unit is extremely practical because it can be easily and quickly assembled on the ground by a relatively short period of work.

  Also, single pipe scaffolds and wedge-tight scaffolds are known as temporary scaffolds other than the frame scaffolds used in the construction work of civil engineering structures or building structures.

  Single pipe scaffolding is a temporary scaffold of a type in which single pipes (steel pipes) are sequentially built on the upper layer in accordance with the progress of construction work. Single-pipe scaffolding consists of steel pipes that comprise fixed base metal fittings on the ground surface at predetermined intervals, erected steel pipe construction, and are used to form roots, arms, cloth, center rails, handrails, braces, etc. They are assembled by tying them in sequence by means of tie fittings (clamp fittings) and laying the scaffolding board on the arms. Single pipe scaffolds, like the framework scaffolds, are dismantled at an appropriate time just prior to completion of construction work.

  The wedge-tightened scaffold is constructed by installing a steel pipe column and assembling a brace, cloth, middle rail, handrail, brace, etc. to the column, just like a single tube scaffold. However, in the wedge-tightening type scaffold, the wedge engaging portion is provided on the support column, and members such as arms and cloth are fastened to the wedge engaging portion by the wedge action of the wedge member (Patent Document 2: JP 2013-189812 A). Issue gazette).

  No attempt has been made in the past to construct a windshield unit using a single tube scaffold or a wedge-tight scaffold.

JP 2002-227404 A JP 2013-189812 A

  When the temporary draft shield unit is lifted from the ground, or when the temporary draft shield unit is lowered from the aerial structure, an operation of mooring or locking the hoist or the like of the lifting machine to the top of the temporary draft shield unit is required. This type of work is also required when the temporary windshield unit is moved on the overhead structure or when the temporary windshield unit after use is lowered from the overhead structure onto the ground.

  FIG. 8 is a perspective view of the temporary windshield unit schematically showing the operation of locking or mooring the hook of the hoist or the like to the temporary windshield unit of the conventional configuration.

  The temporary draft shield unit 100 (hereinafter referred to as the unit 100) is generally configured by left and right side portions 101 that cover the side surfaces of the aerial structure S and a connecting portion 102 that interconnects the left and right side portions 101. The side part 101 and the connection part 102 have the structure which attached the wall surface panel 103 and the top surface panel 104 to the outer surface of steel frames (not shown). Panels 103 and 104 form a working space in unit 100 for performing welding or the like of overhead structure S in a state protected from the external environment such as wind and rain. As described above, the steel frame is a steel frame obtained by assembling a steel material, or a steel or metal frame obtained by assembling a building frame and a cloth frame for a frame scaffold.

  On the top surface of the unit 100, an annular hook engaging portion 105 capable of mooring or locking a hook 110 or the like of a lifting machine (not shown) is disposed. The hook engaging portions 105 are respectively disposed at the corners of the top surface of the unit 100 and are integrally connected to the steel framework of the unit 100. When the unit 100 is raised and lowered, the lifting machine hangs the unit 100 in a state where the hooks 110 and the like of the plurality of wire ropes 111 are locked or anchored to the hook engaging portions 105. On the top surface of the unit 100, an openable / closable hatch 106 is arranged for an operator to go up to the unit top surface. The operation of locking or mooring each hook 110 of the lifting machine to each hook engaging portion 105 is performed by an operator on the top surface of the unit as shown in FIG.

  That is, in such hook locking or hook mooring work, an operator must rest on the top surface of the temporary windshield unit and lock or moor the hoist of the hoisting machine on the top of the temporary windshield unit. In addition, the situation where the worker is placed on the top of the temporary draft shield unit as described above also occurs when the temporary draft shield unit is inspected or when safety is confirmed. For this reason, it is desirable that the temporary draft shield unit is constantly provided with safety means for ensuring the safety of this kind of high-altitude work, but the conventional temporary draft shield unit does not have such safety means. .

  Further, in the above windshield unit using a steel frame having a structure in which steel materials are integrally assembled, a relatively large amount of labor and work time are required to construct a temporary windshield unit. On the other hand, the temporary draft shield unit using the building frame and the cloth frame for the frame scaffolding is advantageous in that respect because the draft shield unit can be easily assembled in a relatively short time. However, in the temporary draft shield unit using the building frame and cloth frame for the frame scaffolding, the braces can be installed in the girder direction or in the depth direction (direction parallel to the axis of the aerial structure). The brace cannot be installed in a direction (a direction orthogonal to the axis of the aerial structure), and there is a problem that it is difficult to easily improve the rigidity of the temporary draft shield unit. In addition, in the temporary draft shield unit using the building frame and the cloth frame for the frame scaffolding, when assembling the upper floor material (cloth frame) or the top plate to the building frame, a handrail for ensuring the safety of the worker is provided. There is also a problem that it is difficult to form easily.

  The present invention has been made in view of such problems, and its object is to improve the safety and workability of workers on the top surface of the temporary draft shield unit, It is an object of the present invention to provide a temporary draft shield unit that can easily and quickly construct a metal frame and that can install braces in both the girder direction and the beam-to-beam direction of the frame.

To achieve the above object, the present invention comprises left and right side portions disposed on both sides of an aerial structure, and a connecting portion disposed on the upper side of the aerial structure and connecting the left and right sides, The side portion and the connecting portion are formed of a steel or metal frame and a panel material or a sheet material attached to the outer surface of the frame, and define a work room or a work space on the side surface and the upper surface of the aerial structure. In the temporary draft shield unit to
Engagement that can project or lift the hoist of the hoist to form a handrail strut on the top surface of the uppermost floor or roof surface that forms the top surface of the temporary draft shield unit. Provided is a temporary draft shield unit characterized in that a stop portion or a mooring portion is formed on the handrail support column.

  Preferably, the frame includes a wedge-fastening-type support column in which wedge-engaging portions are arranged at an interval in the axial direction, and a wedge-fastening-type fabric in which an end portion is fastened to the wedge engaging portion by a wedge action of a wedge member. Material and arm wood. In this specification, the horizontal member extending in the beam direction or the depth direction of the temporary draft shield unit (usually the direction along the axial direction of the aerial structure) is described as a cloth material, and the temporary draft shield unit The horizontal member extending in the beam-to-beam direction or the front-end direction is described as the arm lumber.

The present invention is also composed of left and right side portions disposed on both sides of the aerial structure, and a connecting portion that is disposed on the upper side of the aerial structure and connects the left and right side portions. In the temporary windshield unit formed of a steel or metal frame and a panel material or a sheet material attached to the outer surface of the frame, and defining a work room or a work space on the side surface and the upper surface of the aerial structure,
The frame includes a wedge-fastening-type support column in which wedge-engaging portions are arranged at intervals in the axial direction, and a wedge-fastening-type cloth material and arm whose ends are fastened to the wedge-engaging portion by a wedge action of a wedge member. With wood,
A locking part or a mooring part capable of locking or mooring a lifting device of the lifting machine is formed by the wedge engaging part arranged at a predetermined interval on the wedge-tightening support column. A temporary installation characterized by engaging or anchoring to the support column by engaging an opening formed in the wedge engaging portion or a flange portion constituting the wedge engaging portion for driving a member. Provide windshield units.

From another point of view, the present invention arranges the left and right side portions on both sides of the aerial structure, and arranges the connecting portion connecting the left and right side portions on the upper side of the frame structure to form the side portion and the connecting portion. In a method of constructing a temporary windshield unit that defines a working room or a working space on the side surface and the upper surface of an aerial structure by a steel or metal frame that is formed and a panel material or a sheet material attached to the outer surface of the frame ,
The wedge-fastening-type support column in which the wedge-engaging portions are arranged at intervals in the axial direction, and the wedge-fastening-type cloth material and the arm wood whose ends are fastened to the wedge-engaging portions by the wedge action of the wedge member. Build a skeleton,
By covering the outer surface of the framework with a panel material or a sheet material, the work chamber or work space is formed,
The wedge-tightening-type support column is protruded upward from the uppermost floor surface or roof surface to form a handrail support column on the top surface of the temporary draft shield unit,
Provided is a construction method of a temporary windshield unit, in which a lifting tool suspension is locked or moored to the handrail post, and the temporary windshield unit is moved up and down by the lifting machine and installed on the aerial structure. .

  According to the above-described configuration of the present invention, the temporary windshield unit can be lifted and lowered by locking or mooring the hoisting device of the hoist to the column, so that the tensile force acting on the temporary windshield unit at the time of rising and lowering can be increased. Since the axial force of the vertical shaft member of the frame can be transmitted to the frame, it is possible to carry out a stable lifting operation of the temporary draft shield unit.

  Further, according to the above-described configuration in which the wedge-tightening-type support column, the wedge-tightening-type cloth material, and the arm wood are assembled by the wedge member, the above-mentioned frame can be easily and quickly assembled. In an integral shaft structure in which wood is fastened to a wedge-tightening-type column, braces can be installed in both the girder direction and the beam-to-beam direction to improve the rigidity of the frame.

  Furthermore, by attaching a handrail to the handrail support column formed by the upper protrusion of the support column, a safe work area surrounded by the handrail can be formed on the top surface of the temporary draft shield unit. It is possible to improve the safety and workability of the work for assembling the top plate and the like, and the safety and workability of workers on the temporary draft shield unit.

  Preferably, the wedge engaging portion includes a flange portion or a flange portion integrally fixed to the wedge-tightening type support column, and the lifting device of the lifting machine engages with a flange portion or the like for driving the wedge member. In this way, it is locked or moored to the handrail column. Preferably, a cross brace connected to the flange portion of the wedge-tightening support column is arranged on each surface in the spar direction and / or the inter-beam direction.

  More preferably, the cloth material and the arm wood are tightly coupled to the wedge engaging portion of the handrail column, and the cloth material and the arm wood form a permanent handrail on the top surface or the roof surface of the temporary draft shield unit. Preferably, the lifting device of the lifting machine is locked or moored to the wedge engaging portion of the handrail support column located at the middle rail level.

  According to a preferred embodiment of the present invention, the temporary draft shield unit has a floor material supported by the arm wood or cloth material, and the floor material has a multi-story work room or work space at the side portion. Form.

  According to the temporary windshield unit of the present invention in which the handrail support column is formed on the top surface of the temporary windshield unit and the construction method thereof, it is possible to improve the safety, workability, and the like of the worker who is placed on the top surface of the temporary windshield unit. .

  Further, according to the temporary windshield unit of the present invention in which a steel or metal frame is configured by a wedge-tightened column, cloth material, and arm wood, and a construction method thereof, a framework can be constructed easily and quickly. In addition, the braces can be installed in both the girder direction and the inter-beam direction of the frame.

FIG. 1 is a perspective view of a temporary windshield unit schematically showing an operation of locking or mooring a hook or the like of a lifting machine with respect to the temporary windshield unit according to the present invention. FIG. 2 is a partially cutaway front view showing an embodiment of a temporary draft shield unit in which a steel frame is constructed on the ground using the components of a wedge-tight scaffold. FIG. 3 is a partially cutaway side view of the temporary draft shield unit shown in FIG. FIG. 4 is a partially broken plan view of the temporary draft shield unit shown in FIGS. 2 and 3. FIG. 5 is a partial elevation view and a partial cross-sectional view of a steel frame showing the structure of a wedge-tight scaffold. FIG. 6 is a partial elevation view and a partial cross-sectional view of a handrail post showing a state in which a hook of a lifting machine is moored or locked to a steel frame. FIG. 7 is a partially cutaway front view of the temporary windshield unit showing a state in which the temporary windshield unit is placed on the aerial structure. FIG. 8 is a perspective view of the temporary windshield unit schematically showing the operation of locking or mooring the hook of the hoist or the like to the temporary windshield unit of the conventional configuration.

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

  FIG. 1 is a perspective view of a temporary windshield unit schematically showing an operation of locking or mooring a hook or the like of a lifting machine with respect to the temporary windshield unit according to the present invention.

  A temporary draft shield unit 1 (hereinafter referred to as “unit 1”) installed in an aerial structure S such as a bridge is a connection that interconnects the left and right side parts 2 that cover the side surfaces of the aerial structure S and the left and right side parts 2. It is comprised from the part 3 as a whole. The side part 2 and the connection part 3 have the structure which attached the wall surface panel 4 and the top surface panel 5 to the outer surface of steel frames (not shown). The panels 4 and 5 form a working space in the unit 1 for performing welding or the like of the aerial structure S in a state protected from the external environment such as wind and rain.

  The handrail column 6 protrudes upward from the outer edge of the top surface of the unit 1 at a predetermined interval, and the handrail 7 and the middle rail 8 are installed between the adjacent handrail columns 6. A cross brace 9 is installed on a part of the side surface of the unit 1 instead of the middle rail 8. The handrail assembly 10 is formed over the entire circumference of the outer peripheral zone of the top surface of the unit by the handrail support 6, the handrail 7, the middle rail 8, and the brace 9. On the top surface of the unit 1, an openable / closable hatch or door 20 is arranged for an operator to go up from the space in the unit 1 to the top surface. If desired, a hatch, door, or door 21 (shown by a broken line) for the worker to move from the space in the unit 1 onto the aerial structure S is disposed on the wall surface of the connecting portion 3. In addition, a ventilation fan 22 for ventilating the work space in the unit 1 is disposed at an appropriate position on the wall surface panel 4.

  The handrail support 6 is provided with a hook engaging portion 11 capable of mooring or locking a hook 110 or the like of a lifting machine (not shown). The hook engaging portion 11 is provided on the handrail column 6 disposed at each corner of the top surface of the unit, and is disposed at the middle rail level of the handrail column 6. The lifting machine lifts each hook engaging portion 11 with a plurality of wire ropes 111.

  The operation of locking or mooring each hook 110 of the lifting machine to each hook engaging portion 11 is performed by a worker on the top surface of the unit as shown in FIG. Since the handrail assembly 10 extends over the entire circumference of the unit top surface, a safe work area is ensured on the unit top surface.

  In the present invention, in order to construct the steel framework of the unit 1 having such a handrail assembly 10 easily and quickly, the structure of the wedge-tightened scaffold is adopted as the structure of the steel framework.

  2, 3 and 4 are a partially broken front view, a partially broken side view and a partially broken plan view showing an embodiment of a unit 1 in which a steel framework is constructed using the components of a wedge-tightened scaffold. FIG. 5 is a partial elevation view and a partial cross-sectional view of a steel frame showing a wedge-tightening structure of a wedge-tightening type scaffold.

  As shown in FIGS. 2 to 4, the steel frame 30 is assembled on the ground surface GL by ground assembling work, and includes a support column 31, a cloth material 32, an arm lumber 33, a cloth frame 34 with a floor, a ladder 35, and braces. ) 36 is assembled. The support 31 extends vertically upward from the uppermost cloth frame 34 with a floor to form the handrail support 6 shown in FIG. Moreover, the cloth frame 34 with the floor of the uppermost layer RF constitutes the top panel 5 shown in FIG. As shown in FIG. 4, a part of the uppermost floor is formed by a hatch 20 that can be opened and closed.

  A wall surface panel 4 is attached to the outer surface of the steel frame 30. The wall surface panel 4 is made of a soundproof panel material having a relatively high sound insulation performance, and is integrally attached to the support column 31, the cloth material 32, and the arm wood 33 by a connector or the like (not shown). If desired, the wall surface panel 4 includes a sound absorbing material, and the joint between the wall surface panels 4 is airtightly treated with a sealing material or the like. Such a soundproof structure or soundproofing treatment of the unit 1 is an effective noise countermeasure for blocking noises such as a striking sound generated when a high strength bolt or an ultrahigh strength bolt is tightened.

  Thus, the steel frame 30 surrounded by the wall surface panel 4 and having the uppermost floor cloth frame 34 disposed at the uppermost level RF is an internal space protected from external weather fluctuations, that is, welding. A work space for work and the like is formed.

  The internal space of the steel frame 30 has a three-layer configuration including first to third layers F1: F2: F3. If desired, the internal space of the steel frame 30 may be designed to have a one-layer or two-layer configuration, or a multi-layer configuration having four or more layers.

  An open / close door or door 39 is attached to the lowermost layer (first layer) F1. In a state where the unit 1 is assembled at the ground level, the operator can enter the work space in the unit 1 through the opening of the opening / closing door 39 or can leave the work space in the unit 1. Further, the worker can move up and down by a ladder 35 provided in each of the layers F1 to F3 for vertical movement.

  The support 31 has a structure in which steel support members 31 ′ (FIG. 5) having an overall length (overall height) of 90 cm to 3.6 m, for example, an overall length (overall height) of 1.8 m, are connected in series. The structure of the connecting portion 37 of the support material 31 ′ is shown in FIG. The upper end reduced diameter portion 31 ″ of the lower strut member 31 ′ is inserted into the lower end opening of the upper strut member 31 ′, and the pin portion of the U-shaped connector 38 is connected to the lower end portion and the upper end reduced diameter portion of the strut member 31 ′. It is inserted through a pin insertion opening (not shown) drilled in 31 ″, and thereby the upper and lower support members 31 ′ are interconnected. The connection portion 37 configured as described above transmits compressive stress and tensile stress acting in the axial direction of the support column 31. That is, the connecting portion 37 resists the axial compression force P1 acting on the support column 31 when the unit 1 is assembled on the ground, and resists the axial tensile force P2 acting on the support column 31 after being lifted by the lifting machine.

The strength of the connecting portion 37 formed in this way is set as follows with respect to the horizontal load PH, vertical tensile load PT and vertical compressive load PC shown in FIG.
・ Horizontal load PH ≧ 2.65kN (average 2.94kN), deflection amount ≦ 19mm or less (when PH = 1.47kN)
(Preferably, PH ≧ 4.0 kN (average 4.0 kN), deflection amount ≦ 15 mm or less (when PH = 1.47 kN))
・ Vertical tensile load PT ≧ 14.7 kN (average: 16.2 kN), elongation amount ≦ 0.9 mm (when PT = 8.83 kN)
(Preferably PT ≧ 20.0 kN (average 20.0 kN), elongation ≦ 0.9 mm (when PT = 8.83 kN))
・ Vertical compressive load PC ≧ 37.3kN (average 41.2kN)
(Preferably PC ≧ 45.0 kN (average 45.0 kN))

  As shown in FIGS. 2 and 3, the support column 31 has flange portions or flange portions 40 (hereinafter referred to as flange portions 40) arranged at a predetermined interval (45 cm interval in this example). The flange portion 40 constitutes a wedge engaging portion. As shown in FIG. 5, each flange portion 40 is made of a metal member integrated with the support column 31 and includes a plurality of openings 41 arranged at an angular interval of 90 degrees. The opening 41 includes a pair of openings 41 a: 41 c extending in the same direction as the cloth material 32 and a pair of openings 41 b: 41 d arranged in the same direction as the arm lumber 33.

  The cloth material 32 or the arm wood 33 includes connection portions 32 a and 33 a that can be connected to the flange portion 40 at both ends. The connection parts 32a and 33a are divided | segmented up and down so that the flange part 40 may be pinched | interposed. Openings 32b and 33b into which the connecting wedge member 50 can be inserted are formed in the upper portions 32c and 33c and the lower portions 32d and 33d, respectively. The openings 32 b and 33 b are aligned with the opening 41 of the flange 40. The wedge member 50 is inserted into the upper and lower openings 32b and 33b of the coupling parts 32a and 33a and penetrates the opening 41 of the flange 40. The head of the wedge member 50 is hit with a tool such as a hammer and is driven into the flange portion 40 and the connecting portions 32a and 33a by the hitting force P3. The flange portion 40 and the connecting portions 32a and 33a are fastened by the wedge action of the wedge member 50 and are integrally connected. The wedge member 50 has a protrusion 51 for preventing the wedge member 50 from blocking the wedge member 50 from coming out of the connecting portions 32a and 33a.

The strength of the wedge tightening portion thus tightened is set as follows with respect to the downward vertical load PD and the upward vertical load PU acting near the tightening portion as shown in FIG. The strength of the wedge binding portion is set under the condition that the same loads PD and PU act on the opposite wedge binding portion.
・ Downward vertical load PD ≧ 4.5kN (average 5kN)
(Preferably PD ≧ 8 kN (average 8 kN), more preferably PD ≧ 10 kN (average 10 kN))
・ Upward vertical load PU ≧ 4.5kN (average 5kN)
(Preferably PU ≧ 8 kN (average 8 kN), more preferably PU ≧ 10 kN (average 10 kN))
・ Slip amount of wedge-tightened part ≦ 5mm (when vertical load PU = 3.5kN)
(Preferably, slip amount ≦ 0.5 mm (when PU = 3.5 kN))

  According to the unit 1 having the strength of the connecting portion 37 and the strength of the wedge binding portion as described above, not only does the unit 1 not be harmful or significantly deformed when the unit 1 is raised or lowered, but also the aerial structure. It has been found that when installed on S, the unit 1 can be used as a structurally stable temporary draft shield unit without causing any particular hindrance to the strength and proof stress of the unit 1.

  Further, the end portion of the brace material 36 can be connected to the flange portion 40. As shown in FIGS. 2 and 3, the brace material 36 of this example has a configuration in which the upper ends of the two intersected brace materials 36 are pivotally attached to the ends of the cloth material 32 or the arm wood 33 in advance. A pivoting portion 60 that connects the upper end portion of the brace material 36 and the end portion of the cloth material 32 or the arm lumber 33 has a locking pin (not shown) inserted into the opening 41 of the flange portion 40.

  The lower end portion of each brace material 36 located on the opposite side of the pivot attachment portion 60 has a structure equivalent to the connecting portions 32a and 33a of the cloth material 32 and the arm lumber 33 (however, the form of the lower end portion of the brace material 36 and The detailed configuration is different from the connecting portions 32a and 33a). The lower end portion of each brace member 36 is fastened to the flange portion 40 by the wedge action of the wedge member 50 and is integrally connected to the flange portion 40. The brace material 36 constitutes a reinforcing material for improving the rigidity of the unit 1 against a lateral force or a horizontal load.

  The steel frame 30 of the unit 1 shown in FIGS. 2 to 4 is configured such that the support material 31 ′ is connected up and down on the ground by the connection tool 38 and the support 31 is extended upward, while the cloth material 32, the arm wood 33, and the brace. It is formed by sequentially connecting or locking the material 36 and the like to the flange portion 40 from the lower layer side. Further, the floor-attached cloth frame 34 and the ladder 35 are sequentially laid or attached to the cloth material 32 and the arm lumber 33 laid between the columns 31.

  According to such a steel frame 30 of the wedge connection type, the upper part of the column material 31 ′ built as the column 31 of the first layer F <b> 1 can protrude above the level of the second layer F <b> 2. Accordingly, in the construction process of the first layer F1, the cloth material 32, the arm wood 33 and the brace material 36 of the second layer F2 are attached in advance to the flange portion 40 located above the floor surface level of the second layer F2. Thereby, the leading handrail of the second layer F2 can be formed. Similarly, the leading handrail of the third layer F3 can be formed in the construction process of the second layer F2, and the leading handrail of the uppermost layer RF can be formed in the construction process of the third layer F3.

  The upward projecting portion of the column 31 formed as the leading handrail of the uppermost layer RF constitutes the handrail column 6. The cloth material 32, the arm wood 33, and the brace material 36 that are tightly coupled to the flange portion 40 of the handrail support column 6 constitute the handrail 7, the middle rail 8, and the cross brace 9 of the handrail assembly 10 shown in FIG.

  The cloth frame 34 with the floor of the uppermost layer RF is laid and the hatch 20 is attached, whereby the steel frame 30 is constructed, and then the wall panel 4 and the like are attached to the outer surface of the steel frame 30. In addition, it is also possible to perform the attachment process of the wall surface panel 4 simultaneously with the construction process of the steel frame 30.

  The ground unit 1 thus completed is lifted by a lifting machine (not shown) and installed on the aerial structure S as shown in FIG.

  FIG. 6 is a partial elevation view and a partial cross-sectional view of the handrail strut 6 showing a state in which the lifting machine hook 110 is moored or locked to the steel framework 30 to raise the unit 1.

  The tip of the hook 110 constituting the hoist of the lifting machine is inserted into the opening 41 of the flange 40 located on the handrail column 6 and engages with the flange 40, whereby the hook 110 is connected to the flange 40. Locked or moored. The worker can perform this work in a safe work area formed on the top surface of the unit by the handrail assembly 10 as shown in FIG.

  As shown by the arrows in FIG. 6, the wire rope 111 is pulled obliquely upward by the lifting machine, and the flange portion 40 is lifted and lifted by the lifting machine. Since the tensile force acting on the unit 1 at the time of ascent is transmitted to the column 31 of the steel frame 30 as the axial force of the vertical shaft member, the unit 1 can be lifted up in a stable state.

  In addition, it may replace with the hook 110 and may use the shackle (not shown) which comprises the lifting device of a lifting machine. The shackle is disposed so as to surround the handrail column 6, and the bolt portion 112 (shown by a broken line in FIG. 6) of the shackle is disposed below the flange portion 40. The wire rope 111 wound around the shackle body is pulled obliquely upward by a lifting machine, and the bolt portion 112 engages with the flange portion 40 and the handrail column 6, and the handrail column 6 is moved as shown by an arrow in FIG. Push it up diagonally.

  FIG. 7 is a partially broken front view of the unit 1 showing a state in which the unit 1 is placed on the aerial structure S. FIG.

  The unit 1 is raised above the aerial structure S and lowered by the side portion 2 so as to straddle the aerial structure S. The unit 1 includes a beam member 80 fixed to the column 31 at the time of ground assembly. The beam member 80 extends below the connecting portion 3 so as to bridge the left and right side portions 2. The beam member 80 is placed on the upper surface of the aerial structure S by the lowering of the unit 1, and the load of the unit 1 is loaded on the frame structure S via the beam member 80.

  Thus, with respect to the unit 1 installed on the aerial structure S, a horizontal reinforcing member 81 for preventing or suppressing the rolling behavior of the unit 1 is arranged along the lower surface of the aerial structure S. The reinforcing member 81 is connected to the support column 31 so as to bridge the left and right side portions 2, and is locked or anchored to the aerial structure S by the anchoring tool 82.

  Further, a horizontal member 83 such as a cloth material or an arm wood is installed below the reinforcing member 81 so as to bridge the left and right side portions 2. A cloth frame 84 with a floor is laid on the horizontal member 83.

  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, in the description of the above embodiment, the lifting work for moving the temporary windshield unit after ground assembly onto the aerial structure has been described, but when moving the temporary windshield unit along the aerial structure, or When the temporary draft shield unit on the aerial structure is lowered to the ground and disassembled, the same unit lifting operation using a lifting machine is performed.

  In addition, the number of spans and dimensions of the temporary draft shield unit in the beam direction and the beam-to-beam direction can be appropriately changed in accordance with the cross section of the aerial structure.

  Furthermore, the number of wire ropes of the lifting machine, the position of the handrail post to which the wire rope should be locked or moored, and the like can be appropriately changed according to the situation.

  Moreover, in the said Example, although the outer wall surface is formed with the panel material, you may form an outer wall surface with sheet materials, such as a flexible sheet material, and, in the said Example, it is a flat plate-shaped flange part. Is used as the wedge engaging column, but the steel frame is formed by using the wedge-bonded column having the wedge engaging portion of another form such as a U-shape or a box shape. Alternatively, the frame may be formed by using a wedge-tightened support column made of an alloy.

  The present invention is applied to a temporary draft shield unit used in construction work for constructing an aerial structure such as a steel structure bridge. The temporary draft shield unit of the present invention is a work safety for assembling the uppermost floor material or the top plate, etc. by forming the handrail strut on the top surface of the unit with the frame strut protruding upward from the uppermost floor surface or roof surface. Workability, safety of workers on the draft shield unit, and workability can be improved. By using wedge-tightened columns, cloth material and arm wood, braces can be placed in the beam direction and between the beams. Since the steel frame installed in both directions can be easily and quickly constructed, its practical effect is remarkable.

DESCRIPTION OF SYMBOLS 1 Temporary windshield unit 2 Side part 3 Connecting part 4 Wall panel 5 Top panel 6 Handrail support 7 Handrail 8 Middle rail 9 Cross brace 10 Handrail assembly 11 Hook engagement part 20 Hatch 30 Steel frame 31 Support 31 'Support material 32 Cloth material 33 Arm wood 34 Cloth frame 35 Ladder 36 Brace material 37 Connection part 38 Connection tool 40 Flange part or collar part (wedge engagement part)
41 Opening 50 Connection Wedge Member 110 Hook (lifter for lifting machine)
111 wire rope (wire rope of hoist)
S Fictional structure F1 to F3 1st to 3rd level RF Top level GL Ground surface

Claims (10)

The left and right side portions disposed on both sides of the aerial structure and the connecting portion that is disposed on the upper side of the aerial structure and connects the left and right sides, the side portion and the connecting portion are made of steel or metal. In a temporary windshield unit formed by a manufactured frame and a panel material or a sheet material attached to the outer surface of the frame, and defining a work room or a work space on the side surface and the upper surface of the aerial structure,
Engagement that can project or lift the hoist of the hoist to form a handrail strut on the top surface of the uppermost floor or roof surface that forms the top surface of the temporary draft shield unit. A temporary draft shield unit characterized in that a stop or a mooring part is formed on the handrail post. The frame includes a wedge-fastening-type support column in which wedge-engaging portions are arranged at intervals in the axial direction, and a wedge-fastening-type cloth material and arm whose ends are fastened to the wedge-engaging portion by a wedge action of a wedge member. With wood,
The locking portion or the mooring portion is formed by the wedge engaging portion disposed on the wedge-tightening column, and the lifting device of the lifting machine is an opening formed in the wedge engaging portion for driving a wedge member. Alternatively, the temporary windshield unit according to claim 1, wherein the temporary windshield unit is locked or moored to the handrail support column by engaging with a flange portion constituting the wedge engaging portion. The left and right side portions disposed on both sides of the aerial structure and the connecting portion that is disposed on the upper side of the aerial structure and connects the left and right sides, the side portion and the connecting portion are made of steel or metal. In a temporary windshield unit formed by a manufactured frame and a panel material or a sheet material attached to the outer surface of the frame, and defining a work room or a work space on the side surface and the upper surface of the aerial structure,
The frame includes a wedge-fastening-type support column in which wedge-engaging portions are arranged at intervals in the axial direction, and a wedge-fastening-type cloth material and arm whose ends are fastened to the wedge-engaging portion by a wedge action of a wedge member. With wood,
A locking part or a mooring part capable of locking or mooring a lifting device of the lifting machine is formed by the wedge engaging part arranged at a predetermined interval on the wedge-tightening support column. A temporary installation characterized by engaging or anchoring to the support column by engaging an opening formed in the wedge engaging portion or a flange portion constituting the wedge engaging portion for driving a member. Windshield unit.   The ends of the cloth material and the arm wood are tightly coupled to the wedge engaging portion of the handrail support column, and the cloth material and the arm wood form a handrail on the top surface or the roof surface of the temporary draft shield unit. Item 4. A temporary draft shield unit according to Item 2 or 3.   The flooring material supported by the cloth material or the arm wood has the flooring material, and the flooring material forms the working room or the working space of the multi-story floor in the side part. The temporary draft shield unit according to claim 1.   The temporary windshield unit according to any one of claims 2 to 4, wherein the cross braces supported by the wedge engaging portions of the wedge-tightening support columns are arranged in the beam direction and / or the beam-to-beam direction. . A left or right side portion is disposed on both sides of the aerial structure, a connecting portion that connects the left and right side portions is disposed on the upper side of the frame structure, and a steel or metal framework that forms the side portion and the connecting portion; In the construction method of a temporary windshield unit that defines a work room or a work space on the side surface and the upper surface of the aerial structure by the panel material or the sheet material attached to the outer surface of the frame,
The wedge-fastening-type support column in which the wedge-engaging portions are arranged at intervals in the axial direction, and the wedge-fastening-type cloth material and the arm wood whose ends are fastened to the wedge-engaging portions by the wedge action of the wedge member. Build a skeleton,
By covering the outer surface of the framework with a panel material or a sheet material, the work chamber or work space is formed,
The wedge-tightening-type support column is protruded upward from the uppermost floor surface or roof surface to form a handrail support column on the top surface of the temporary draft shield unit,
A construction method of a temporary windshield unit characterized in that a lifting tool suspension is locked or moored to the handrail post, and the temporary windshield unit is moved up and down by the lifting machine and installed on the aerial structure.   An engagement portion or a mooring portion of the lifting tool is formed by the wedge engaging portion disposed on the wedge-tightening column, and an opening formed in the wedge engaging portion for driving a wedge member, or the wedge The construction method according to claim 7, wherein the suspension tool is engaged with or anchored to a handrail column by engaging the suspension tool with a flange portion that constitutes the engagement portion.   9. The cloth material and the arm wood are tightly coupled to a wedge engaging portion of the handrail support column, and a handrail is formed on the top surface or the roof surface of the temporary draft shield unit by the cloth material and the arm wood. The construction method described in 1.   A floor material is laid on the arm lumber or cloth material to form the working room or working space of a multi-story floor at the side portion, and a brace material is attached to a wedge engaging portion of the wedge-tightening column, The construction method according to any one of claims 7 to 9, characterized in that the spar is arranged in a girder direction and / or a beam-to-beam direction.

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