JP6446075B2 - How to build a curing net - Google Patents

Description

  The present invention relates to a method for laying a curing net during construction of a high-rise building, and a net jig used in the erection method.

  One of the causes of disaster cases in the construction of high-rise buildings is the “flying drop” of parts such as bolts and nuts.

  High-rise buildings are mainly S structures, that is, steel structures, and as a construction work to construct a steel frame, usually a pillar having a length of multiple floors is built, and then the pillars are connected to each other. It is attached. Here, when there is a margin in the site, it is possible to start up an external scaffolding in the surroundings in advance and attach a curing net to the external scaffolding, and perform the construction work in a state surrounded by the curing net There is no risk of accidents even if a flying drop occurs during construction work.

  However, when there is no room in a site such as an urban area, a pillar is built without an external scaffold, a beam is attached to the pillar, and then a curing net is attached to the outside of the pillar or beam. Here, since most of the column building work is a work around the column base on a safe work floor, the risk of flying and falling is low. However, since the work of attaching the beam to the column is a work away from the work floor, there is a high risk of an accident due to a flying drop, and measures to prevent this have been demanded.

  Patent Documents 1 and 2 disclose a method in which a curing net can be installed before attaching a beam to a column in order to prevent an accident due to a flying drop during construction work.

  Specifically, in Patent Document 1, an opening / closing rod that opens to the left and right around the column is attached to the upper end of the column, and the column is built with a curing net attached to the opening / closing rod. A method of stretching a curing net by opening a heel left and right is disclosed.

  Further, in Patent Document 2, the eyebolt attached to the upper end of the pillar is built in a state where both ends are fixed to the lower end of the pillar through the guide rope, and then the curing net is attached to one end of the guide rope. A method of laying a curing net between pillars by pulling up the curing net to the upper end of the pillar is disclosed.

  If the method disclosed in Patent Documents 1 and 2 is used, a beam can be attached to a column with the work area surrounded by a curing net. Occurrence can be prevented.

Japanese Patent Laid-Open No. 8-120942 JP 2004-169484 A

  Curing nets used in the construction of high-rise buildings have a considerable amount of weight because they have a length of a plurality of floors according to the length of the pillars. In the method disclosed in Patent Document 1, the open / close rod attached to the pillar is attached to the open / close rod by opening the open / close rod until the free end is in the horizontal direction. However, there is a limit to the length of the opening and closing rod that can withstand the weight of the curing net, and if the distance between the columns is too wide, the curing net will be too heavy and the method concerned Can not take. In addition, a motor for opening the opening / closing rod along with the opening / closing rod is attached to the column, and it is complicated to attach these members to the column and to remove these members from the column after the curing net is stretched. is there.

  Moreover, since the method disclosed by patent document 2 only lifts the right and left of the upper end of a curing net with a guide rope, the horizontal direction center part of a curing net hangs down with dead weight. Therefore, this method is not suitable when the interval between columns is too wide.

  An object of the present invention is a method of laying a curing net on the outside of a column before attaching the beam to the column, which is easier to work and does not cause drooping due to its own weight even when the interval between columns is wide. The purpose is to provide a method of laying a curing net.

The first of the present invention is two rod-shaped support members parallel to each other through a predetermined distance, and the two supports attached to both ends of the support member and at least one position between the both ends. A step of attaching one end of a curing net to one of the two support materials along the longitudinal direction of a long net jig having a connecting material for connecting materials to each other ;
Attaching the bracket to one end in the longitudinal direction of the pillar before erection,
Building the column with the bracket attached so that the bracket is positioned on the upper end side;
The net jig with the curing net attached is arranged so that the longitudinal direction is horizontal and the one supporting material with the curing net attached is downward and the other supporting material is upward. Attaching a shackle to the material and lifting it with a crane, attaching both ends of the net jig to the bracket attached to the upper end of the pillar, and
It is the construction method of the curing net characterized by having.

Oite to the present onset bright includes a preferred embodiment the following configuration.
The net jig is provided with a connecting plate having a surface orthogonal to the longitudinal direction at both ends in the longitudinal direction.
In the net jig, one of the two support members is a single pipe pipe, and the other is a square pipe, and at least one side surface of both sides of the square pipe at a plurality of locations along the longitudinal direction. A mounting bracket is attached.

  According to the present invention, since the curing net is attached to the net jig and the net jig is attached to the pillar, the curing net does not hang down due to its own weight even when the interval between the pillars is wide, and can be erected well. It is possible to easily attach and remove the net jig to / from the pillar.

  Further, the net jig of the present invention is composed of two support materials and a connecting material, and is strong and lightweight, so it is easy to handle and can withstand the weight of a wide curing net. be able to. In addition, since the connecting plates are provided at both ends, the connection plates can be easily extended in accordance with the interval between the columns.

  Therefore, according to the present invention, even if the interval between the pillars is wide, the curing net can be satisfactorily constructed by a simple operation, and the occurrence of an accident due to a flying drop in the construction work can be prevented.

It is a mimetic diagram of composition of one embodiment of a net jig of the present invention. It is a perspective view of the state where the part shown by A of the net jig of Drawing 1 was cut out. It is a perspective view of the state where the part shown by B of the net jig of Drawing 1 was cut out. It is a cross-sectional schematic diagram of the C-C 'part of the net jig of FIG. It is a schematic diagram which shows the pillar before erection of the state which attached the bracket based on the construction method of the curing net | network of this invention. It is the figure which looked at the pillar from the enlarged view of the site | part which attached the bracket in FIG. 5, and the side which attached the bracket. It is a schematic diagram which shows the state which connected the pillar which attached the bracket to the upper end of the lower pillar. It is a schematic diagram which shows the state which attached the curing net to the net jig illustrated to FIGS. 1-3, and was lifted with the crane. It is a schematic diagram which shows the state which attached the net jig | tool which attached the curing net to the bracket attached to the upper end of a pillar. It is a schematic diagram which shows the state which changed the upper end of the curing net | network from the net jig | tool to the temporary handrail.

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

  First, the net jig of the present invention used in the curing net erection method of the present invention will be described.

  FIG. 1 is a diagram schematically showing a configuration of a preferred embodiment of the net jig of the present invention. As shown in FIG. 1, the net jig 1 of the present invention includes two rod-like support members 2 and 3 parallel to each other at a predetermined distance, both end portions of the support members 2 and 3, and both end portions. And a connecting member 4 attached at least at one location. The connecting member 4 is a member that connects the supporting members 2 and 3. By using the connecting member 4, the spacing between the supporting members 2 and 3 is kept equal, and the twist of the net jig 1 and the supporting member 2 are maintained. , 3 can be prevented. Further, the support material 2 is a member for attaching a shackle when being lifted by a crane, and the support material 3 is a member for attaching a curing net. Therefore, the connecting member 4 is attached at a predetermined interval in the longitudinal direction of the supporting members 2 and 3, and a shackle is attached to the supporting member 2 using the gap between the adjacent connecting members 4. The mounting pitch P of the connecting members 4 in the longitudinal direction of the support members 2 and 3 is preferably equal in the net jig 1 so that the strength of the net jig 1 is not partially reduced.

  In this invention, FIG. 2, FIG. 3 is a perspective view in the state which cut out the site | part each shown by A and B in FIG. 4 is a cross-sectional view taken along the line C-C ′ in FIG. 1.

  In the present invention, the support member 2 is preferably a single pipe pipe having a circular cross section and generally used for construction of an external scaffold because it can be easily attached to the bracket by a single pipe clamp. Examples of the single pipe pipe include a cylindrical single pipe pipe having an outer diameter of 42.7 mm and a thickness of 1.6 mm. Moreover, it is preferable that the support member 3 is attached with a mounting bracket for mounting the curing net. When mounting the mounting bracket, the support member 3 is preferably a square tube. Moreover, the intensity | strength of the net jig | tool 1 is also improved by using a square tube. Examples of the square tube include a square tube having one side of the outer periphery of 60 mm, a thickness of 1.2 mm, and a square cross section. Moreover, since the strength of the net jig 1 decreases as the distance W between the support members 2 and 3 increases, the distance W is preferably as narrow as possible so that the net jig 1 can be easily attached to the bracket. It is about 200 mm.

  In this example, a carabiner-like C-ring 5 is attached to each side surface of the square tube as the support member 3 as a mounting bracket. It should be noted that the mounting bracket is only required to be attached to at least one side surface of both sides of the square tube. However, as shown in FIG. 4, the curing net can be attached to either side by being attached to both sides. When attaching a curing net to the net jig 1, there is no need to consider the orientation of the net jig 1, which is advantageous. Further, the mounting bracket may be attached to the net jig 1 at a plurality of locations so that the curing net does not hang down due to its own weight, and is attached at a plurality of locations in the length direction of the support material 3 according to the weight of the curing net. . In addition, the mounting bracket is not limited to the C-ring 5 used in this example, and is preferably used as long as it is a member that allows easy attachment and removal of the curing net.

As the connecting material 4, the supporting materials 2 and 3 are connected and preferably used as long as they have high strength and light weight. For example, a steel plate having a thickness of about 6 mm is used. Be joined. Further, the length L2 of the connecting member 4 in the longitudinal direction of the support members 2 and 3 increases the strength of the net jig 1, but increases the weight of the net jig 1 itself. It is preferable that the length is as short as possible to prevent the twisting of the support member 2 and the support members 2 and 3 from being bent. Specifically, it is preferable to arrange the connecting members 4 with L2 = about 100 mm to 200 mm at a pitch of about P = 750 mm to 1200 mm.

  As shown in FIG. 3, the net jig 1 of the present invention includes connecting plates 6 at both ends in the longitudinal direction, so that a plurality of net jigs 1 can be connected to each other to extend the length. it can. As shown in FIGS. 1 and 3, the connecting plate 6 is fixed to the supporting members 2 and 3 and the connecting member 4 by welding or the like so as to have a surface orthogonal to the longitudinal direction of the net jig 1. The connecting plate 6 may be the same member as the connecting member 4. Further, since the connecting members 4 arranged at both ends of the support members 2 and 3 in contact with the connecting plate 6 are joined to the connecting plate 6 to increase the strength, the length L3 is made shorter than L2. May be shortened to 1/2.

  The connection plate 6 is provided with an attachment hole 6a penetrating the connection plate 6, and the connection plate 6 at one end of the two net jigs 1 by means of a bolt or the like through the attachment hole 6a, The length of the net jig 1 can be extended more than twice by fixing the connecting plate 6 at the other end to each other. In addition, since the net jig 1 after the connection can be easily released, it can be handled in a compact state except when used for the construction work of the curing net, and it is not bulky during storage and transportation and can be handled. Easy.

  Specifically, the length L1 of the net jig 1 of this example is preferably about 1500 mm to 4500 mm in consideration of easiness of storage, conveyance, handling, and workability of connection and disconnection. Further, according to the distance between the columns to be attached, for example, a 2000 mm net jig 1 and a 4000 mm net jig 1 may be used in combination.

  Next, the construction method of the curing net of the present invention using the above-described net jig of the present invention will be described.

  In the present invention, a bracket for attaching the net jig is attached to one end of the column before being built before, after or in parallel with the step of attaching one end of the curing net to the above-described net jig of the present invention.

  FIG. 5 is a diagram schematically showing the column 11 to which the bracket 12 is attached, FIG. 6A is an enlarged view of a part to which the bracket 12 is attached, and FIG. It is the figure which looked at the pillar 11 from the side. Usually, the pillar which becomes the frame of a high-rise building has a length corresponding to a plurality of floors, and the pillar 11 in FIG. 5 includes three floors from the middle of the N floor to the middle of the N + 3 floor. The bracket 12 is attached to one end of the pillar 11 so that the attachment portion 12a of the net jig protrudes in the height direction and outward from the end after the pillar 11 is built.

  Although a net jig is attached to the bracket 12, the net jig is removed from the bracket 12 after the curing net attached to the net jig is replaced with a handrail, as will be described later. Therefore, since the bracket 12 is not necessary after the net jig is removed, it is not necessary to attach the bracket 12 to the pillar 11 by a removable means such as a screw or a bolt so that the bracket 12 can be removed. The removed bracket 12 is reused. The bracket 12 is not limited as long as it can hold the net jig horizontally with the net jig attached with the curing net attached. Therefore, it may be appropriately made of a steel material used at a construction site.

  FIG. 7 is a schematic diagram showing a state in which the column 11 to which the bracket 12 is attached is connected to the upper end of the column 11 ′ that has been previously built. The right side of the page is outside the work area. The bracket 12 has a net jig attachment portion 12a that protrudes upward from the upper end of the column 11 and protrudes to the outside of the work area. Further, an N-floor work floor 13 is attached to the upper end side of the lower-layer-side pillar 11 ′ located below the pillar 11, and the work floor 13 protrudes outward from the pillar 11 ′ and ends at the end. A temporary handrail 14 is attached. A curing net 15 ′ is attached to the handrail 14.

  As shown in FIG. 7, one end of the curing net is attached to the above-described net jig of the present invention before or after or in parallel with the step of installing the column 11 to which the bracket 12 is attached. In the case of the net jig 1 of FIGS. 1 to 3, a curing net is attached to the C ring 5.

  FIG. 8 is a schematic diagram showing a state in which the curing net 15 is attached to the net jig 1 illustrated in FIGS. 1 to 3 and is lifted by a crane (not shown) to which the automatic ball removing device 30 is attached. FIG. 8 shows a state in which two net jigs 1 and 1 having the same configuration are connected and used. In FIG. 8, the curing net 15 is attached to a C ring 5 attached to the support material 3, and the shackle 21 attached to the support material 2 is held by the grip member 31 of the automatic ball removal device 30. In FIG. 8, 32 is a lifting chain, 33 is an operation cable, 34 is an apparatus main body, and a power source and a control device are incorporated therein.

  As shown in FIG. 8, since the net jig 1 of the present invention has a gap between the support materials 2 and 3, the position of the shackle 21 can be freely selected, and the connected net jig 1 can be selected. The shackle 21 can be attached more centrally than both ends of the tools 1 and 1. Therefore, when the pillar 11 is built, the net jig 1 is lifted by using the automatic ball removing device 30 that lifts the upper end and the lower end of the pillar 11 as it is, and the net jig 1 is manually attached to the pillar 11. After that, the gripping member 31 can be automatically removed from the shackle 21.

  FIG. 9 is a schematic view showing a state in which the net jig 1 lifted as shown in FIG. 8 is attached to the attachment portion 12 a of the bracket 12 at the upper end of the column 11. Thereafter, as shown in FIG. 10, a beam (not shown) is attached to a predetermined position of the pillar 11, and the work floor 13 and the handrail 14 similar to the work floor 13 and the handrail 14 of the Nth floor are connected to the N + 1 floor to the N + 3 floor. Then, the upper end of the curing net 15 attached to the net jig 1 is removed from the net jig 1 and replaced with the handrail 14 on the N + 3 floor. Therefore, the height H1 from the position where the N + 3 floor work floor 13 is provided to the attachment site 12a is set to be higher than the height H2 to the upper end of the handrail 14, and the length of the curing net 15 in the vertical direction is set. Is set to such a length that the lower end overlaps the lower curing net 15 ′ with the net jig 1 attached to the attachment part 12 a. The lower end of the curing net 15 is taken inside the handrail 14 on the N floor and is fixed to the curing net 15 'or the handrail 14 on the N floor as appropriate.

  As shown in FIG. 8, the curing net 15 is attached to the net jig 1, and the net jig 1 is lifted with a crane so that the longitudinal direction of the net jig 1 is horizontal, and both ends of the net jig 1 are attached to the pillars 11. As shown in FIG. 9, the outer periphery of the work area including the pillar 11 is covered with the curing net 15 by manually attaching the bracket 12 to the attachment portion 12 a of the bracket 12. The means for attaching the net jig 1 to the bracket 12 is not particularly limited. As shown in FIG. 10, the net jig 1 is attached because the curing net 15 is removed from the bracket 12 after being replaced with the handrail 14 on the N + 3 floor. It is preferable to use a member such as a clamp that can be easily removed. When a single pipe is used as the support member 2 of the net jig 1, a single pipe clamp can be used. Further, the net jig 1 and the bracket 12 which are no longer necessary after the curing net 15 is replaced with the handrail 14 are respectively removed and used for the construction of the next curing net.

  In addition, when installing a curing net, the net jig that connects one or more lifted by a crane and the horizontal length of the curing net attached to the net jig are attached to the net jig. By making it longer than the distance between the center portions of the two pillars, the outer periphery of the work area including the pillars can be covered with a curing net without gaps. As for the pillars located at the corners of the building, the two surfaces of the pillars constituting the corners are each covered with a curing net, but the curing net covering at least one surface and the end on the corner side of the net jig The portion is protruded from the corner portion, and the mounting position is shifted up and down so that the two net jigs do not hit each other. And it can prevent that a clearance gap produces between two curing nets in a corner | angular part by removing the edge part by the side of the corner | angular side of said one curing net from a net jig, and overlapping on the other side. . Also, even when three or more pillars are arranged in the horizontal direction, the mounting positions of the two net jigs attached to the center pillar are shifted up and down, and one of the net jigs and the curing nets in the horizontal direction. One end may be overlapped with the other net jig and the other end of the curing net.

  As described above, in the method for laying a curing net according to the present invention, the curing net can be erected without gaps and without sagging due to its own weight even when the interval between the columns is wide. Further, the net jig of the present invention can be lifted by using an automatic ball removing device used for erection of a pillar, and no special device is required. Furthermore, it is easy to remove the net jig from the pillar. Therefore, according to the present invention, the work area including the pillar can be surrounded by the curing net before attaching the beam to the pillar by a simple work, and the occurrence of an accident due to a flying drop can be prevented.

  1: Net jig, 2, 3: Support material, 4: Connection material, 4: Connection plate, 5: C ring, 6: Connection plate, 6a: Mounting hole, 11, 11 ′: Column, 12: Bracket, 12a : Attachment site, 13: Work floor, 14: Handrail, 15, 15 ': Curing net, 21: Shackle, 30: Automatic ball removal device, 31: Holding member, 32: Lifting chain, 33: Operation cable, 34: Main unit

Claims (3)

Two rod-like support members that are parallel to each other through a predetermined distance, and a connecting member that connects the two support members attached to each other at both ends of the support member and at least one place between the both ends. And attaching one end of the curing net to one of the two support members along the longitudinal direction of the long net jig having
Attaching the bracket to one end in the longitudinal direction of the pillar before erection,
Building the column with the bracket attached so that the bracket is positioned on the upper end side;
The net jig with the curing net attached is arranged so that the longitudinal direction is horizontal and the one supporting material with the curing net attached is downward and the other supporting material is upward. Attaching a shackle to the material and lifting it with a crane, attaching both ends of the net jig to the bracket attached to the upper end of the pillar, and
A method for laying a curing net, comprising: Said net jig, the both ends in the longitudinal direction, erection method Curing net according to claim 1, characterized in that the connecting plate is mounted with a plane perpendicular to the longitudinal direction. In the net jig, the one support member is a single pipe pipe, and the other support member is a square tube, and at least one side surface of both sides of the square tube, a plurality of locations along the longitudinal direction, net the jig according to claim 1 or 2, characterized in that the mounting bracket is attached.

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