JP2012077578A - Work scaffolding and method for constructing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for constructing work scaffolding, which enables efficient construction.SOLUTION: In a method for constructing work scaffolding, the work scaffolding 2 is installed below a pier structure 4 borne by a plurality of bearing piles 8. The method for constructing the work scaffolding comprises: a scaffolding member assembling step of assembling a scaffolding member 10 on the ground; a fixing support member attachment step of attaching a fixing support member 12 to a predetermined part of the specific bearing pile 8 among the plurality of bearing piles 8; a scaffolding member lowering step of lowering the assembled scaffolding member 10 to a water surface so as to float it on the water surface; a scaffolding member moving step of moving the scaffolding member 10 to the vicinity of the specific bearing pile 8 in the state of keeping it floated on the water surface; and a scaffolding member fixing step of making the predetermined part of the scaffolding member 10 fixedly supported by the fixing support member 12.

Description

  The present invention relates to a work scaffold that is installed below a jetty structure supported by a plurality of support piles and a construction method therefor.

  In harbors, etc., jetty structures are installed to moor ships. This pier structure is made of reinforced concrete and is supported by a plurality of support piles standing on the underwater ground. Since the lower surface of the pier structure is likely to deteriorate due to the influence of seawater, it is necessary to periodically repair the lower surface of the pier structure. Conventionally, such repair work has been performed by installing a suspension scaffold below the pier structure (see, for example, Patent Document 1). As a construction method of this suspension scaffold, after attaching a fixed support member (anchor) to the lower surface of the pier structure, the joist member combining a plurality of pipes is suspended and supported by this fixed support member via a chain, Thereafter, a scaffold board is laid on the joist member.

Japanese Patent Laid-Open No. 10-325126

  As described above, the process of forming a joist member by combining a plurality of pipes, the process of suspending and supporting the joist member on a chain, the process of placing a scaffolding plate on the joist member, etc. are all pier structures. Therefore, workability is poor and work efficiency is reduced. In addition, since suspension scaffolds are swayable and unstable, construction of suspension scaffolds must be interrupted when affected by waves or changes in tide level. For this reason, the construction work period of the suspension scaffold occupying the whole work period of the repair work for the lower surface of the jetty structure becomes long, and there arises a problem that the repair work cannot be performed efficiently.

  The objective of this invention is providing the scaffold for work which can perform construction efficiently, and its construction method.

In the construction method of the work scaffold according to claim 1 of the present invention, the work scaffold is constructed by installing the work scaffold below the pier structure supported by a plurality of support piles,
A scaffold member assembling step for assembling the scaffold member on the ground, a fixed support member attaching step for attaching a fixed support member to a predetermined part of a specific support pile among the plurality of support piles, and lowering the assembled scaffold member to the water surface A scaffold member lowering step floating on the scaffold member, a scaffold member moving step of moving the scaffold member to the vicinity of the specific support pile in a state of floating on the water surface, and a scaffold for fixing and supporting a predetermined part of the scaffold member on the fixed support member And a member fixing step.

  Moreover, in the construction method of the working scaffold according to claim 2 of the present invention, in the fixed support member attaching step, a fixed support member is provided at a site below the water surface of the specific support pile among the plurality of support piles. Attachment, a scaffold member setting step is performed between the scaffold member moving step and the scaffold member fixing step. In the scaffold member setting step, the scaffold member is submerged in the vicinity of the specific support pile. It is characterized by.

  Moreover, in the construction method of the working scaffold according to claim 3 of the present invention, the scaffold member is provided with a guide hole, and in the scaffold member setting step, the guide member is attached to the fixed support member, The scaffold member is submerged in water in a state where the guide member is inserted through the guide hole of the scaffold member.

Moreover, in the construction method of the working scaffold according to claim 4 of the present invention, the scaffold member has a scaffold frame formed in a pipe shape, and water is injected into the scaffold frame into the scaffold frame. A water injection valve for discharging the air in the scaffold frame, and an exhaust valve for discharging the air in the scaffold frame to the outside,
In the scaffold member moving step, the water injection valve and the exhaust valve are held closed in a state where the scaffold frame is filled with air, and in the scaffold member laying step, the exhaust valve is opened. The air in the scaffold frame is discharged to the outside by holding the water, and the water injection valve is held in an open state to inject water into the scaffold frame.

  Moreover, in the construction method of the working scaffold according to claim 5 of the present invention, the scaffold member is configured in a substantially rectangular shape, and in the fixed support member attaching step, the scaffold among the plurality of support piles. The fixed support member is attached to a portion of each of the four support piles corresponding to the four corners of the member under the water surface, and in the scaffold member moving step, the scaffold member is floated on the water surface and in the vicinity of the four support piles. In the scaffold member setting step, the scaffold member is submerged in the water inside the four support piles, and in the scaffold member fixing step, the four corners of the scaffold member are respectively attached to the four fixed support members. It is characterized by being fixedly supported.

Moreover, in the construction method of the working scaffold according to claim 6 of the present invention, in the scaffold member assembling step, the scaffold members are assembled on the ground, and in the fixing support member attaching step, the plurality of scaffold members. The fixed support member is attached to a portion of each of the plurality of support piles corresponding to the bottom of the water surface, and in the scaffold member lowering step, the assembled scaffold members are lowered to the water surface and floated on the water surface, and the scaffold member In the moving step, the plurality of scaffold members are moved to the vicinity of the corresponding four support piles in a state of floating on the water surface, and in the scaffold member setting step, the plurality of scaffold members are respectively corresponding to the four support piles. Submerged inside one of the support piles, in the scaffold member fixing step, each of the four corners of the plurality of scaffold members is Four fixed support member is fixedly supported,
A scaffold member connecting step is performed after the scaffold member fixing step, and in the scaffold member connecting step, a pair of adjacent scaffold members are connected to each other by a connecting member.

Further, in the work scaffold according to claim 7 of the present invention, the work scaffold is installed below the pier structure supported by a plurality of support piles,
A scaffold member, and a fixed support member attached to a portion of the specific support pile below the water surface among the plurality of support piles, wherein the predetermined portion of the scaffold member is fixedly supported by the fixed support member, and the scaffold member Is characterized in that there are provided sinking means for sinking the scaffold member in water and floating means for floating the scaffold member on the water surface.

  In the working scaffold according to claim 8 of the present invention, the scaffold member has a scaffold frame formed in a pipe shape, and the sinking means is a water injection valve for injecting water into the scaffold frame. And an exhaust valve for discharging the air in the scaffold frame to the outside, and the floating means includes a drain valve for discharging the water in the scaffold frame to the outside, and an inside of the scaffold frame And an air supply valve for injecting air.

  In the working scaffold according to claim 9 of the present invention, the scaffold frame is composed of a plurality of frame members combined with each other, and each of the plurality of frame members includes the settling means and The floating means is provided.

  In the work scaffold according to claim 10 of the present invention, the scaffold member is configured in a substantially rectangular shape, and the fixed support member includes four of the plurality of support piles corresponding to the four corners of the scaffold member. It is attached to the site | part under the water surface of each support pile, The four corners of the said scaffold member are each fixedly supported by the said four fixed support members, It is characterized by the above-mentioned.

In the work scaffold according to claim 11 of the present invention, a plurality of the scaffold members are provided, and the fixed support member is provided with four fixed support portions for fixing and supporting the scaffold member in the circumferential direction. The four corners of each of the plurality of scaffold members are fixedly supported by the fixed support portions of the corresponding four fixed support members,
Further, in connection with the scaffold member, a connecting member for connecting a pair of adjacent scaffold members to each other is provided.

  According to the construction method of the working scaffold according to claim 1 of the present invention, since the scaffold member is assembled on the ground, the work under the pier structure is reduced accordingly. Further, since the scaffold member is moved in a state of floating on the water surface, the scaffold member can be easily moved to a predetermined position by towing the scaffold member with, for example, an outboard motor ship or a winch. As a result, workability is improved, the construction period of the work scaffold can be shortened, and the construction can be performed efficiently.

  Moreover, according to the construction method of the working scaffold according to claim 2 of the present invention, since the scaffold member is submerged in water and fixedly supported by the fixed support member, the scaffold member is laid in water. Thereby, it can suppress that a scaffold member receives the influence of a wave and a tide level change, and can perform the operation | work with a scaffold member with the stable attitude | position.

  Moreover, according to the construction method of the working scaffold according to claim 3 of the present invention, the guide member is attached to the fixed support member, and the scaffold member is submerged in a state where the guide member is inserted into the guide hole of the scaffold member. Since it sinks, the scaffold member can be stably submerged in water.

  According to the construction method of the working scaffold according to claim 4 of the present invention, in the scaffold member laying step, the exhaust valve is held open to discharge the air in the scaffold frame to the outside, Since the valve is held in an open state to inject water into the scaffold frame, the scaffold member can be submerged in a relatively simple configuration.

  Moreover, according to the construction method of the working scaffold according to claim 5 of the present invention, in the scaffold member fixing step, the four corners of the scaffold member are fixedly supported by the four fixed support members, respectively. Can be performed stably.

  Moreover, according to the construction method of the working scaffold according to claim 6 of the present invention, the four corners of each of the plurality of scaffold members are fixedly supported by the corresponding four fixed support members, and a pair of adjacent scaffold members are Since they are connected to each other by the connecting member, the scaffold member can be laid over a wide range, and the repair work for the lower surface of the pier structure can be performed efficiently.

  Moreover, according to the working scaffold according to claim 7 of the present invention, the fixed support member is attached to a part of the specific support pile below the water surface among the plurality of support piles, and the predetermined part of the scaffold member is fixedly supported. Since it is fixedly supported by the member, the scaffold member is laid in water. Thereby, it can suppress that a scaffold member receives the influence of a wave and a tide level change, and can perform the operation | work with a scaffold member with the stable attitude | position. Further, since the scaffold member is provided with a sinking means for sinking the scaffold member in the water, the scaffold member can be submerged in the water and fixedly supported by the fixed support member. As a result, the scaffold member can be easily fixed and supported with respect to the stationary support member, and the work scaffold can be efficiently constructed. Further, since the scaffold member is provided with a floating means for floating the scaffold member on the water surface, the scaffold member can be floated on the water surface by this floating means, and the scaffold member can be easily removed. It can be carried out.

  Further, according to the working scaffold according to claim 8 of the present invention, the sinking means has the water injection valve and the exhaust valve, so that the air in the scaffold frame is discharged to the outside by the exhaust valve, and the water injection By injecting water into the scaffold frame by the valve, the scaffold member can be submerged in water. In addition, since the floating means has a drain valve and an air supply valve, air is injected into the scaffold frame by the air supply valve, and water in the scaffold frame is discharged to the outside by the drain valve. The scaffold member can be floated on the water surface. Therefore, the construction of the sinking means and the floating means can be made relatively simple.

  According to the working scaffold according to claim 9 of the present invention, each of the plurality of frame members constituting the scaffold frame is provided with the sinking means and the floating means. By adjusting the amount of air discharged from the valve (or the amount of air injected into the air supply valve), the posture of the scaffold member is stabilized when the scaffold member is submerged in water (or floated on the water surface). be able to.

  Moreover, according to the work scaffold according to claim 10 of the present invention, the four corners of the scaffold member are fixedly supported by the four fixed support members, respectively, so that the scaffold member can be stably fixed and supported.

  According to the working scaffold according to claim 11 of the present invention, the four corners of each of the plurality of scaffold members are fixedly supported by the respective fixed support portions of the corresponding four fixed support members, and a pair of adjacent pairs. Since the connecting members for connecting the scaffold members to each other are provided, the scaffold members can be laid over a wide range, and the repair work for the lower surface of the pier structure can be performed efficiently.

It is a perspective view which shows the scaffold for work by one Embodiment of this invention. It is a perspective view which shows a scaffold member. It is a figure for demonstrating the structure relevant to the sedimentation means and floating means of a scaffold member. (A) is a figure which shows the state before sinking a scaffold member in water, (b) is a figure which shows the state in the middle of sinking a scaffold member in water, (c) is a figure which puts a scaffold member in water. It is a figure which shows the state sunk. (A) is a figure which shows the state before levitating a scaffold member on the water surface, (b) is a figure which shows the state in the middle of levitating a scaffold member on the water surface, (c) is a figure which shows a scaffold member. It is a figure which shows the state which floated on the water surface. (A) is a top view which shows the state before attaching a fixed support member to a support pile, (b) is a top view which shows the state which attached the fixed support member to the support pile. It is a figure for demonstrating a scaffold member assembly process. It is a figure for demonstrating a fixed support member attachment process. It is a figure for demonstrating a scaffold member descent | fall process. It is a figure for demonstrating a scaffold member moving process. It is a perspective view which shows the state which attached the guide member to the fixed support member. It is a figure for demonstrating a scaffold member setting process. It is a figure for demonstrating a scaffold member fixing process.

  Hereinafter, with reference to an accompanying drawing, one embodiment of a work scaffold and its construction method according to the present invention is described. 1 is a perspective view showing a working scaffold according to an embodiment of the present invention, FIG. 2 is a perspective view showing a scaffold member, and FIG. 3 is related to a sinking means and a floating means of the scaffold member. It is a figure for demonstrating a structure, FIG. 4 (a)-(c) is a figure for demonstrating the process of sinking a scaffold member in water, and Fig.5 (a)-(c) is a scaffold member. FIG. 6A is a plan view showing a state before the fixed support member is attached to the support pile, and FIG. 6B is a view showing the fixed support member. FIG. 7 is a view for explaining a scaffold member assembling process, and FIG. 8 is a view for explaining a fixed support member attaching process. 9 is a diagram for explaining the scaffold member lowering step, and FIG. 10 is for explaining the scaffold member moving step. 11 is a perspective view showing a state in which the guide member is attached to the fixed support member, FIG. 12 is a view for explaining the scaffold member setting step, and FIG. 13 is the scaffold member fixing step. It is a figure for demonstrating.

  With reference to FIG. 1, the work scaffold 2 of this embodiment is installed under the jetty structure 4 for mooring a ship in a harbor etc. FIG. The pier structure 4 is made of reinforced concrete, and a fender 6 is provided at the tip thereof. A plurality of support piles 8 arranged in a lattice pattern are erected on the underwater ground, and the pier structure 4 is supported by the plurality of support piles 8 from below. The surface of the upper end portion of the support pile 8 is coated with anticorrosion.

  The work scaffold 2 includes a plurality of scaffold members 10 and a plurality of fixed support members 12 attached to portions of each of the plurality of support piles 8 below the water surface. The scaffold member 10 includes a scaffold frame 14 configured in a Japanese character shape (rectangular shape), a plurality of reinforcement members 16 fixedly supported on the upper surface of the scaffold frame 14 at intervals, and an upper side of the plurality of reinforcement members 16. And an expanded metal 18 fixedly supported on the substrate (see FIG. 2). The reinforcing member 16 is configured in a pipe shape having a rectangular cross section. The expanded metal has a rectangular shape and a mesh shape, and is fixedly supported so as to cover almost the entire upper surface of the scaffold frame 14. By using the net-like expanded metal 18 in this way, water can freely pass through the expanded metal 18 and the influence of waves can be reduced. In addition, the four corners of the scaffold frame 14 are respectively provided with insertion holes 22 through which fixing bolts 20 (described later) are inserted and guide holes 26 through which guide members 24 (described later) are inserted. In FIG. 2, a part of the expanded metal 18 is cut away.

  The scaffold frame 14 is configured by combining first to fifth frame members 28a to 28e configured in a pipe shape having a circular cross section in a Japanese character shape (see FIGS. 2 and 3). The first to fourth frame members 28a to 28d are combined in a square shape, and the first frame member 28a and the second frame member 28b, the third frame member 28c and the fourth frame member 28d are arranged to face each other. Has been. The fifth frame member 28e is bridged between the third frame member 28c and the fourth frame member 28d. Partition walls 30 and 32 are provided between both end portions of the first frame member 28a and one end portions of the third frame member 28c and the fourth frame member 28d, respectively. Partition walls 34 and 36 are provided between the other end portions of the frame member 28c and the fourth frame member 28d, respectively. In addition, partition walls 38 and 40 are provided between both end portions of the fifth frame member 28e and the longitudinal center portions of the third frame member 28c and the fourth frame member 28d, respectively. Each of the partition members 30 to 40 partitions the inside of each of the frame members 28a to 28e. In FIG. 3, illustration of the plurality of reinforcing members 16 and the expanded metal 18 is omitted.

  An exhaust valve 42 for exhausting the air in the frame members 28a-28e to the outside and an air supply valve 44 for injecting air into the frame members 28a-28e, respectively, on the upper surfaces of the frame members 28a-28e, (See FIGS. 3 to 5). Further, on the lower surfaces of the frame members 28a to 28e, water injection / drainage valves 46 (water injection valves and drainage valves for injecting water into the frame members 28a to 28e or discharging water inside the frame members 28a to 28e to the outside, respectively. (See FIG. 4 and FIG. 5). The exhaust valve 42 and the pouring / draining valve 46 constitute sinking means, and the air supply valve 44 and the pouring / draining valve 46 constitute floating means. In FIG. 2, the exhaust valve 42 and the air supply valve 44 are not shown.

  As shown in FIG. 4, the scaffold member 10 can be submerged in the water by the above-described substituting means as follows. While the scaffold member 10 is floated on the water surface (see FIG. 4A), the exhaust valve 42 and the pouring / draining valve 46 of each frame member 28a to 28e are held open, and the frame members 28a to 28e are opened. The air supply valve 44 is kept closed. Thereafter, the operation panel 48 is connected to the exhaust valve 42 of each of the frame members 28a to 28e. The operation panel 48 is connected to a compressor 52 installed on the jetty structure 4 through an air supply / exhaust pipe 50 (see FIGS. 3 and 12), and the frame members 28a to 28e are connected to the compressor 52 from the exhaust valve 42. This is for adjusting the amount of air discharged and the amount of air injected into the air supply valve 44. When the compressor 52 is operated, the air in the frame members 28a to 28e is discharged to the outside from the exhaust valve 42 by the action of the compressor 52, and the pressure in the frame members 28a to 28e is reduced. Thereby, water is poured into the frame members 28a to 28e from the pouring / draining valve 46 (see FIG. 4B), and the scaffold member 10 is submerged in the water due to negative buoyancy (see FIG. 4C). . At this time, in order to stabilize the posture of the scaffold member 10, the operation panel 48 is appropriately operated to adjust the amount of air discharged from the exhaust valves 42 of the frame members 28a to 28e. When the scaffold member 10 is submerged in the water, the operation of the compressor 52 is stopped, and the exhaust valve 42 and the pouring / draining valve 46 of each of the frame members 28a to 28e are kept closed. The operation panel 48 may be operated by operating switches (not shown) provided on the operation panel 48 or remotely operated on the jetty structure 4.

  Further, as shown in FIG. 5, the scaffold member 10 can be floated on the water surface by the above-described floating means as follows. While the scaffold member 10 is submerged in the water (see FIG. 5A), the air supply valve 44 and the pouring / draining valve 46 of each of the frame members 28a to 28e are held open, and each of the frame members 28a to 28e. The exhaust valve 42 of 28e is kept closed. Thereafter, the operation panel 48 is connected to the air supply valve 44 of each of the frame members 28a to 28e. FIG. 3 shows a state in which the operation panel 48 is connected to the air supply valve 44 of each frame member 28a to 28e. When the compressor 52 is operated, air (compressed air) is injected into the frame members 28a to 28e from the air supply valve 44 by the action of the compressor 52, and the pressure in the frame members 28a to 28e is increased. Thereby, the water in each frame member 28a-28e is discharged | emitted outside from the pouring / draining valve 46 (refer FIG.5 (b)), and the scaffold member 10 comes to surface on the water surface by positive buoyancy (FIG.5 ( c)). At this time, in order to stabilize the posture of the scaffold member 10, the operation panel 48 is appropriately operated to adjust the amount of air injected into the air supply valves 44 of the frame members 28a to 28e. When the scaffold member 10 is floated on the water surface, the operation of the compressor 52 is stopped, and the air supply valve 44 and the water supply / drainage valve 46 of each of the frame members 28a to 28e are held in the closed state.

  The fixed support member 12 includes a pair of attachment band fittings 54 attached to the support pile 8 and four fixed support portions 56 supported by the pair of attachment band fittings 54 (see FIG. 6). A pair of attachment band metal fittings 54 are configured to be separable, and the pair of attachment band metal fittings 54 are connected and fixed to each other by bolts 58 and nuts 60. A pair of support portions 62 are provided on the outer surface of each mounting band metal 54 at intervals in the circumferential direction, and a fixed support portion 56 is supported on each support portion 62 with a bolt or the like. The four fixed support portions 56 are disposed at substantially equal intervals in the circumferential direction, and each fixed support portion 56 is disposed so as to face the inside of the four support piles 8 corresponding to the four corners of the scaffold member 10. ing. The fixing support portion 56 is configured in a substantially triangular shape, and a bolt hole 64 into which the fixing bolt 20 is screwed and an insertion hole 66 into which the lower end portion of the guide member 24 is detachably inserted are provided on the upper side surface. ing.

  The fixing bolts 20 are screwed into the bolt holes 64 of the fixing support portion 56 through the insertion holes 22 of the scaffold member 10, so that the four fixing support members 12 corresponding to the four corners of the scaffold member 10 are respectively fixed. 56 is fixedly supported (see FIG. 1). A pair of adjacent scaffold members 10 are connected to each other by a connecting member (not shown).

  Next, the construction method of the working scaffold 2 described above will be described with reference to FIGS. First, a plurality of scaffold members 10 are assembled on the pier structure 4 or on the ground such as a factory (scaffold member assembly step). When the scaffold member 10 is assembled at the factory, the assembled plurality of scaffold members 10 are transported onto the pier structure 4 by a truck 68 or the like (see FIG. 7). Next, the fixed support member 12 is attached to a portion of the support pile 8 in water (fixed support member attaching step). In this fixed support member attaching step, the diver 70 dives under the pier structure 4 and attaches the pair of attachment band brackets 54 to predetermined portions of the support pile 8 and attaches the four fixed support portions 56 to the pair of attachments. It is supported by the band metal fitting 54 (see FIG. 8). The level at which the fixed support member 12 is attached is set below the water level at low tide. In addition, in order to prevent the surface of the support pile 8 from being damaged, it is preferable to interpose a rubber member or the like (not shown) between the pair of attachment band fittings 54 and the support pile 8.

  Thereafter, the assembled scaffold member 10 is sequentially lowered onto the water surface from the pier structure 4 using the crane 72 and floated on the water surface (scaffold member lowering step) (see FIG. 9). At this time, the exhaust valve 42, the air supply valve 44, and the water supply / drainage valve 46 of each frame member 28a to 28e are held closed, and the scaffold frame 14 is filled with air. The scaffold member 10 comes to float on the water surface due to the buoyancy. Thereafter, with the scaffold member 10 floating on the surface of the water, the outboard motor ship 74 sequentially pulls and moves the scaffold member 10 to a predetermined position (in the vicinity of the corresponding four support piles 8) (scaffold member moving step) ( (See FIG. 10). When the upper limit water surface level L1 is slightly below the lower surface of the jetty structure 4 and the lower limit water surface level L2 is slightly above the upper surface of the fixed support portion 56 of the fixed support member 12, this scaffold member moving step It is preferably performed when the level is between the upper limit water level L1 and the lower limit water level L2.

  Thereafter, the rope members 76 are respectively attached to the four corners of the scaffold member 10, and the scaffold member 10 is temporarily fixed to the corresponding four support piles 8 by the rope members 76 (see FIG. 11). Next, pipe-like guide members 24 extending vertically are inserted into the respective insertion holes 66 of the four fixed support members 12, and the guide members 24 are inserted into the guide holes 26 at the four corners of the scaffold member 10. After that, the exhaust valve 42 and the pouring / draining valve 46 of each frame member 28a to 28e are held open, and the operation panel 48 is connected to the exhaust valve 42 of each frame member 28a to 28e (see FIG. 12). When the compressor 52 is operated, the air in the frame members 28a to 28e is discharged to the outside from the exhaust valve 42 by the action of the compressor 52, and water is injected into the frame members 28a to 28e from the pouring / draining valve 46. The Thereby, the scaffold member 10 is submerged in water inside the corresponding four support piles 8 while being guided by the guide member 24 (scaffold member setting step). At this time, in order to stabilize the posture of the scaffold member 10, the operation panel 48 is appropriately operated to adjust the amount of air discharged from the exhaust valves 42 of the frame members 28a to 28e. When the frame members 28a to 28e are filled with water, the scaffold member 10 sinks into the water, and when the four corners are placed on the fixed support portions 56 of the fixed support member 12, the operation of the compressor 52 is stopped. Then, the operation panel 48 is removed, and the exhaust valve 42 and the pouring / draining valve 46 of each of the frame members 28a to 28e are kept closed.

  Thereafter, the fixing bolt 20 is screwed into the bolt hole 64 of the fixing support member 12 through the insertion hole 22 of the scaffold member 10, and the four corners of the scaffold member 10 are fixedly supported by the fixing support portions 56 of the corresponding four fixing support members 12. (Scaffold member fixing step) (see FIG. 13). After fixing and supporting in this way, the guide member 24 is removed from the fixed support member 12 and the rope member 76 is removed from the scaffold member 10.

  In the same manner as described above, the scaffold members 10 are sequentially fixed and supported by the fixed support members 12 attached to the corresponding four support piles 8 (see FIG. 1), and a pair of adjacent scaffold members 10 are connected (not shown). To each other (scaffolding member connecting step). As described above, the installation of the work scaffold 2 is completed.

  For example, the work scaffold 2 is removed as follows. First, the four corners of the scaffold member 10 are temporarily fixed to the corresponding four support piles 8 using the rope members 76, respectively, and the fixing bolts 20 are removed from the fixed support member 12. The air supply valve 44 and the pouring / draining valve 46 of each frame member 28a-28e are each kept open, the operation panel 48 is connected to the air supply valve 44 of each frame member 28a-28e, and the compressor 52 is operated. As a result, air is injected from the air supply valve 44 into the frame members 28a to 28e, and the water in the frame members 28a to 28e is discharged to the outside from the pouring / draining valve 46, so that the scaffold member 10 floats to the water surface. Will come to do. When the scaffold member 10 floats up to the water surface, the operation of the compressor 52 is stopped, the operation panel 48 is removed, and the air supply valve 44 and the pouring / draining valve 46 of each of the frame members 28a to 28e are kept closed. Thereafter, with the scaffold member 10 floating on the water surface, the scaffold member 10 is sequentially pulled and moved to a predetermined position by the outboard motor ship 74, and the scaffold member 10 is sequentially lifted onto the pier structure 4 by the crane 72. Moreover, the fixed support member 12 is removed from the support pile 8 as needed.

  As mentioned above, although one embodiment of the working scaffold and the construction method according to the present invention has been described, the present invention is not limited to such an embodiment, and various modifications or corrections can be made without departing from the scope of the present invention. Is possible.

  In the said embodiment, the pouring / draining valve 46 is a function of the draining valve for discharging the water in each frame member 28a-28e outside, and the function of the pouring valve for injecting water in each frame member 28a-28e. However, a drain valve and a water injection valve may be provided separately. In the above embodiment, the exhaust valve 42 and the air supply valve 44 are provided separately. However, a supply / exhaust valve having both of these functions may be provided.

  In the above embodiment, the guide member 24 is used in the scaffold member setting step. However, the guide member 24 may be omitted. In addition, when the level adjustment of the scaffold member 10 is necessary in the scaffold member fixing step, a base jack, a steel material block, or the like may be interposed between the scaffold member 10 and the fixed support member 12.

  Moreover, in the said embodiment, although the scaffold frame 14 was comprised from the 1st-5th frame members 28a-28e, the 5th frame member 28e may be abbreviate | omitted and the scaffold frame 14 whole may be comprised in a square shape. .

  In the above embodiment, the scaffold member 10 is lowered to the water surface by the crane 72 in the scaffold member lowering step. However, a winch may be used instead of the crane 72. Further, in the scaffold member moving step, the scaffold member 10 is pulled and moved by the outboard motor ship 74, but a winch may be used instead of the outboard motor ship 74.

  Further, in the above embodiment, in the scaffold member setting step, after the scaffold member 10 is set in water, the exhaust valve 42 and the pouring / draining valve 46 are kept closed. Each drain valve 46 may be held open. As a result, water can freely flow into and out of the frame members 28a to 28e.

  Moreover, in the said embodiment, although it comprised so that the fixed support member 12 might be attached to the site | part under the water surface of the support pile 8 in a fixed support member attachment process, it is comprised so that it may attach to the site | part above the water surface of the support pile 8. May be. In such a case, the scaffold member setting step can be omitted.

  Moreover, in the said embodiment, although the fixed support member attachment process was performed after the scaffold member assembly process, you may make it perform a fixed support member attachment process before a scaffold member assembly process.

2 Work Scaffolding 4 Pier Structure 8 Support Pile 10 Scaffolding Member 12 Fixed Supporting Member 14 Scaffolding Frame 24 Guide Member 26 Guide Hole 28a-28e First to Fifth Frame Member 42 Exhaust Valve 44 Air Supply Valve 46 Injecting / Draining Valve 56 Fixed Supporting part

Claims (11)

A work scaffold construction method for installing a work scaffold below a pier structure supported by a plurality of support piles,
A scaffold member assembling step for assembling the scaffold member on the ground, a fixed support member attaching step for attaching a fixed support member to a predetermined part of a specific support pile among the plurality of support piles, and lowering the assembled scaffold member to the water surface A scaffold member lowering step floating on the scaffold member, a scaffold member moving step of moving the scaffold member to the vicinity of the specific support pile in a state of floating on the water surface, and a scaffold for fixing and supporting a predetermined part of the scaffold member on the fixed support member A work fixing method, comprising: a member fixing step.   In the fixed support member attaching step, a fixed support member is attached to a portion below the water surface of the specific support pile among the plurality of support piles, and a scaffold is provided between the scaffold member moving step and the scaffold member fixing step. 2. The work scaffold construction method according to claim 1, wherein a member sedimentation step is performed, and in the scaffold member sedimentation step, the scaffold member is submerged in water in the vicinity of the specific support pile.   The scaffold member is provided with a guide hole. In the scaffold member setting step, the scaffold member is attached to the fixed support member, and the guide member is inserted into the guide hole of the scaffold member. The construction method for a working scaffold according to claim 2, wherein the member is submerged in water. The scaffold member has a scaffold frame formed in a pipe shape, and a water injection valve for injecting water into the scaffold frame and an air in the scaffold frame are discharged to the scaffold frame. And an exhaust valve
In the scaffold member moving step, the water injection valve and the exhaust valve are held closed in a state where the scaffold frame is filled with air, and in the scaffold member laying step, the exhaust valve is opened. 4. The work according to claim 2, wherein the air in the scaffold frame is discharged to the outside while being held and the water injection valve is held in an open state to inject water into the scaffold frame. Construction method for scaffolds.   The scaffold member is configured in a substantially rectangular shape, and in the fixed support member attaching step, the four support piles corresponding to the four corners of the scaffold member among the plurality of support piles are disposed at portions below the water surface. A fixed support member is attached, and in the scaffold member moving step, the scaffold member is moved to the vicinity of the four support piles while floating on the water surface, and in the scaffold member laying step, the scaffold member is moved to the four It sinks in water inside a support pile, and, in the scaffold member fixing step, the four corners of the scaffold member are fixedly supported by the four fixed support members, respectively. Construction method of work scaffold. In the scaffold member assembling step, a plurality of the scaffold members are assembled on the ground, and in the fixed support member attaching step, the fixed support is provided at a site under the water surface of each of the plurality of support piles corresponding to the plurality of scaffold members. In the scaffold member lowering step, the assembled plurality of scaffold members are lowered to the water surface and floated on the water surface, and in the scaffold member moving step, the plurality of scaffold members are floated on the water surface, respectively. In the scaffold member setting step, the plurality of scaffold members are submerged in water inside the corresponding four support piles, and in the scaffold member fixing step, The four corners of each of the plurality of scaffold members are fixedly supported by the corresponding four fixed support members,
The scaffold member connecting step is performed after the scaffold member fixing step, and in the scaffold member connecting step, a pair of adjacent scaffold members are connected to each other by a connecting member. Construction method of work scaffold. It is a work scaffold installed below a pier structure supported by a plurality of support piles,
A scaffold member, and a fixed support member attached to a portion of the specific support pile below the water surface among the plurality of support piles, wherein the predetermined portion of the scaffold member is fixedly supported by the fixed support member, and the scaffold member A working scaffold comprising: a sinking means for sinking the scaffold member in water; and a floating means for floating the scaffold member on the water surface.   The scaffold member has a scaffold frame formed in a pipe shape, and the setting means includes a water injection valve for injecting water into the scaffold frame, and an exhaust for exhausting air in the scaffold frame to the outside. And the floating means includes a drain valve for discharging water in the scaffold frame to the outside, and an air supply valve for injecting air into the scaffold frame. The working scaffold according to claim 7, wherein the working scaffold.   The scaffold frame is composed of a plurality of frame members combined with each other, and each of the plurality of frame members is provided with the sinking means and the floating means. The working scaffold according to 8.   The scaffold member is configured in a substantially rectangular shape, and the fixed support member is attached to a portion of each of the four support piles corresponding to the four corners of the scaffold member among the plurality of support piles, and the scaffold member The working scaffold according to claim 7, wherein the four corners are fixedly supported by the four fixing support members. A plurality of the scaffold members are provided, and the fixed support members are provided with four fixed support portions for fixing and supporting the scaffold members at intervals in the circumferential direction, and the four corners of each of the plurality of scaffold members are , Fixedly supported by the fixed support portion of each of the corresponding four fixed support members,
The work scaffold according to claim 10, wherein a connection member for connecting a pair of adjacent scaffold members to each other is provided in association with the scaffold member.

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