JP2019078162A - Protective net stretching structure - Google Patents

Abstract

To provide a protective net stretching structure for mounting a protective net to a lower part of an object which possibly falls into an indoor space in earthquake such as a ceiling of a building, a lighting apparatus or a duct, and for stretching easily the protective net for preventing a falling object from falling on an indoor floor surface.SOLUTION: A net stretching structure for stretching a protective net on lower side of an object which possibly falls indoor in earthquake is configured to arrange a series of circular ring shape wire insertion metal fitting on a lower end of a hanging bolt hanging down from a reinforced concrete surface arranged on an upper part of the ceiling, to penetrate a coupling joint wire consisting of a net support wire unit into the wire insertion metal fitting, to couple a net mount wire to the circular part with both ends of the coupling joint wire folded via a coupling metal fitting, to mount a free end part of this wire to a side concrete surface, to mount and fix a protective net via a binding wire and to hang down an intersection of the net support wire unit stretched in a grid shape to the reinforcement concrete surface upward by a hanging bolt.SELECTED DRAWING: Figure 1

Description

  BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a protective net stretching structure that prevents the falling of an object that may fall from the inside of the room.

  In the past, the ceilings of most buildings other than houses and special wooden buildings are composed of “suspended ceilings”, and gypsum boards and lighting fixtures should be placed on the base set connected in a grid shape by connecting to suspension bolts. It was configured as the ceiling surface of the room. However, there is a risk that gypsum boards and lighting fixtures configured as ceilings may fall when a ceiling such as this is constructed in a disaster such as an earthquake, and a technique such as the following publication is disclosed as means for eliminating this risk. It is done.

  For example, Patent Document 1 describes a building reinforcement device capable of preventing a person living in the room from suffering from falling objects from above at the time of an earthquake, and specifically, a ceiling constituting an indoor space The arrangement of metal nets at the bottom of the surface to prevent falling from above is described.

  Patent Document 2 discloses that displacement of a member constituting an indoor ceiling at the time of an earthquake is made by connecting a suspended ceiling to a fixing plate provided at a lower end portion of a column suspended on a ceiling slab via a viscoelastic material. And a structure for preventing the falling of members constituting the ceiling surface by regulating the movement of the ceiling material.

Japanese Patent Application Publication No. 2003-120045 JP, 2009-167737, A

  However, the fall preventing structure of the object from the upper side disclosed in any of the documents does not consider, for example, tensioning of the net after the fall preventing structure is constituted by the net.

  Therefore, the present invention can be easily attached to the ceiling of a building, a lighting fixture or a duct under an object that may fall into an indoor space at the time of an earthquake, and a protective net that prevents the falling objects from falling to the indoor floor Provide a protective net tensioning structure that can be

  The present invention is a net stretching structure for stretching a protective net 12 below an object which may fall into a room at the time of an earthquake, and a suspension bolt 6 suspended from a reinforced concrete surface 2 provided above a ceiling. An annular wire passing metal fitting 7 is provided in a row at the lower end of the joint, the connection joint wire 11 constituting the net supporting wire unit W is inserted into the wire passing metal fitting 7, and both ends of the connection joint wire 11 are folded back. 11a is formed, and the net attachment wire 9 is connected to the annular portion 11a through the annular connection fitting 8, and the free end of the wire 9 is directly attached to the existing reinforced concrete surface 2 and connected with the connection joint wire 11 A net support wire unit W is constituted by the metal fitting 8 and the net attachment wire 9, and furthermore, the net attachment wire 9 is protected by a required means. The net support wire unit W is mounted at a position based on the design of strength calculation that can bear the load load of the falling objects in the room below the protection net 12 in the room where the protection net 12 is attached and fixed. Are extended in a grid shape as necessary, and the crossing portion of the net support wire unit W is suspended by the suspension bolt 6 on the reinforced concrete surface 2 above.

  The end of the protective net 12 and the overlapping portion are properly connected with the end joint wire 14 by supporting the points according to the design of strength calculation designed to withstand dropped object load such as the net attachment wire 9 and the protective net 12 with the suspension bolt 6 The protective net tensioning structure according to claim 1, characterized in that the protection net 12 is bound to the net attachment wire 9 through the binding lines 13 of the required means after correction.

  The wire threading fitting 7 is connected to one end of the turnbuckle 10 via the connection fitting 8, and the other end of the turnbuckle 10 is connected to the net attachment wire 9 via the connection fitting 8. Or it is a protection net stretching structure according to claim 2.

  It is a net tensioning structure for tensioning protection net 12 below an object that may be dropped into the room at the time of an earthquake, and a circle at the lower end of suspension bolt 6 suspended from reinforced concrete surface 2 provided above the ceiling. An annular wire threading fitting 7 is connected in series, the connection joint wire 11 constituting the net support wire unit W is inserted into the wire threading fitting 7, and both ends of the connection joint wire 11 are folded back to form a ring portion 11a. The net attachment wire 9 is connected to the annular portion 11a through the annular connection fitting 8, and the free end of the wire 9 is directly attached to the existing reinforced concrete surface 2 and the connection joint wire 11, the connection fitting 8 and the net The net support wire unit W is constituted by the mounting wire 9, and furthermore, the net mounting wire 9 is protected by means of the binding wire 13 of the required means. In the room where the net 12 is attached and fixed, and in the room where the protective net 12 is stretched, the net support wire unit W at a position based on the design of strength calculation that can bear the load of falling objects in the room below the protective net 12 Is stretched in a grid shape as necessary, and the crossing portion of the net support wire unit W is suspended by the suspension bolt 6 on the reinforced concrete surface 2 above, so the annular portion of the connection joint wire 11 is adjusted By doing this, the adjustment of the tension and relaxation of the net attachment wire 9 is facilitated, and further, the protection net 12 can be easily tensioned in conjunction with the tensioning of the net attachment wire 9. In addition, since the heavy load or special structure is not provided when the protective net 12 is stretched, it is possible to prevent the falling of the object from above at a short construction period and at low cost. In particular, the net support wire unit W can support the protective net 12 from below so as to sufficiently bear the weight load of the falling object, and can prevent the protective net 12 from falling due to insufficient strength.

  The guard net 12 supports the hanging bolt 6 at a point matched to the design of strength calculation of the net attachment wire 9, and the end and overlapping part of the guard net 12 are properly corrected with the end joint wire 14, and required respectively Since the protective net 12 is bound to the net attachment wire 9 via the binding wire 13 of the means, the tension and relaxation state of the protective net 12 is adjusted by adjusting the tensile force of the net attachment wire 9 and the end joint wire 14 Can be easily changed. In addition, the hanging bolt 6 supports the location according to the strength design at the time of catching the falling object and enlarges the area to receive the falling object of the protective net 12 as much as possible, and reliably receives the falling object from above Can.

  The wire threading fitting 7 is connected to one end of the turnbuckle 10 via the connection fitting 8 and the other end of the turnbuckle 10 is connected to the net attachment wire 9 via the connection fitting 8 so that the net attachment wire 9 can be securely attached. It can be connected and fixed. In addition, since the net attachment wire 9 is fixed to the wire through fitting 7 via the turn buckle 10, the tension applied to the net attachment wire 9 is easily adjusted by the turn buckle 10 and connected to the net attachment wire 9. The protective net 12 can be put in an appropriate tension state.

It is a perspective view which shows the protection net tensioning structure in embodiment of this invention. It is a side view showing a protection net stretching structure in an embodiment of the present invention. It is a side view which shows the state which installed the protection net tension installation structure in embodiment of this invention on the reinforced concrete surface of a top surface. It is a side view which shows the protection net stretching structure of wall surface concrete vicinity in the protection net stretching structure of embodiment of this invention. It is a side view showing a state where a suspension bolt is vertically installed from a reinforced concrete surface of a top surface with a bolt fastener in a guard net stretched construction of an embodiment of the present invention, and a net attachment wire is stretched. It is a side view which shows the state which fixed the suspension bolt to structural steel materials in the protection net tension installation structure of embodiment of this invention, and stretched the protection net. It is a side view which shows the state which installed the wire connection metal fitting in the protection net tension installation structure of embodiment of this invention to H type structural steel materials. It is a side view which shows the state which fixed the suspension bolt to C type structural steel materials in the protection net stretching structure of embodiment of this invention, and stretched the protection net | network. It is a side view which shows the state which installed the wire penetration in the pipe truss in the protection net tension installation structure of the embodiment of the present invention. It is a side view which shows the state which connected the net attachment wire to wall surface concrete, without interposing an end part joint wire in the protection net tension installation structure of embodiment of this invention. It is a side view showing a state where a plurality of post-construction anchors embedded in wall concrete in a protection net stretching structure of an embodiment of the present invention are stretched and protection nets are stretched. It is a top view which shows the protection net tensioning structure of embodiment of this invention. It is a side view which shows the state which used the turnbuckle in the protection net tensioning structure of embodiment of this invention.

The present invention is a net stretching structure for stretching a protective net 12 below an object which may fall into a room at the time of an earthquake, and a suspension bolt 6 suspended from a reinforced concrete surface 2 provided above a ceiling. An annular wire passing metal fitting 7 is provided in a row at the lower end of the joint, the connection joint wire 11 constituting the net supporting wire unit W is inserted into the wire passing metal fitting 7, and both ends of the connection joint wire 11 are folded back. 11a is formed, and the net attachment wire 9 is connected to the annular portion 11a through the annular connection fitting 8, and the free end of the wire 9 is directly attached to the existing reinforced concrete surface 2 and connected with the connection joint wire 11 A net support wire unit W is constituted by the metal fitting 8 and the net attachment wire 9, and furthermore, a binding wire 13 of a required means is provided to the net attachment wire 9. The protective net 12 is attached and fixed, and the net is supported at a position based on the design of strength calculation that can bear the load load of the falling objects in the room below the protective net 12 in the room where the protective net 12 is stretched. The wire units W are stretched in a grid shape as necessary, and the crossing portion of the net support wire units W is suspended by the suspension bolt 6 from the reinforced concrete surface 2 above, and the protective net 12 is a net Attach the square to the net attachment wire 9 at the position matched to the design of the strength calculation of the attachment wire 9, attach the end of the protective net 12 and the overlapping part with the end joint wire 14 and make appropriate corrections. The gist is that the protective net 12 is bound to the net attachment wire 9 through the binding wire 13.
That is, the gist of the present invention is a support structure of the protective net 12 stretched below the ceiling surface 1a of the room, and the basic net support structure has the following configuration.
(1) A hanging bolt 6 is vertically installed from the reinforced concrete surface 2 of the top surface provided above the ceiling surface 1a,
(2) A net supporting wire unit W for supporting and holding the protective net 12 is inserted into the annular wire passing metal fitting 7 connected to the lower end of the bolt 6;
(3) Both ends of the wire unit W are connected to the wall concrete 2 'of the facing room via a post construction anchor 4 by fixing them in series, and the net supporting wire unit W is stretched between the wall concrete 2' of the facing room Set up
(4) By integrally binding the net supporting wire unit W and the protective net 12 at the predetermined position with the binding wire 13 of the required means,
(5) The protective net 12 is supported from below by the net support wire unit W.
In such a protective net supporting structure, the structure of the net supporting wire unit W is formed by connecting both ends of the connecting joint wire 11 which is formed by an annular wire portion 11a and the center is formed by one through wire, and the left and right sides of the connecting joint wire 11. An annular connection fitting 8 is connected to the annular portion 11a, and further, one end is folded back to the left and right sides of the annular connection fitting 8 to form an annular portion 14a of an end joint wire 14 formed in the annular portion 11a. The other end of the end joint wire 14 is folded back to form an annular portion 11a and is connected to the annular connection fitting 8. The annular connection fitting 8 connects the post construction anchor 4 to the wall concrete 2 'of the facing room. It consists of the structure fixed in a row via an assembly.

Between the wall concrete 2 'facing in the room, a tensioning structure for tensioning the net support wire unit W below the protection net 12 and supporting the protection net 12 from below is as follows.
That is, it is stretched between facing wall concrete 2 'facing in the room so as to be positioned below the four sides of the protective net 12 to form a square-shaped net support framework S and a square-shaped net support framework S inward. In the above, the intermediate net support wire unit W1 in the longitudinal direction and the lateral direction is further stretched in a cross shape, and the position of this intersection portion is taken as the position calculated by design of strength calculation when passively dropping the protective net 12. Then, the protective net 12 is attached to the net support wire unit W at a square.

In the square net supporting framework S, the intermediate net supporting wire unit W1 stretched in the longitudinal direction or the lateral direction is adjacent to the intermediate net supporting wire unit W1 adjacent to the position calculated by the strength calculation design. Keep the interval between and stretch.
The crossing portion of the intermediate net support wire unit W1 stretched in the longitudinal direction or the lateral direction is suspended by the wire passing metal fitting 7 at the lower end of the suspension bolt 6.
In the wire passing metal fitting 7, the connection joint wire 11 in the intermediate net supporting wire unit W1 is inserted and suspended.
As described above, under the protective net 12, the crossing portion of the intermediate net support wire unit W1 stretched in the longitudinal direction or the lateral direction is suspended by the wire passing metal fitting 7 at the lower end of the suspension bolt 6 to protect the protective net 12 from below. Since the intermediate net support wire unit W1 is suspended by the wire passing metal fitting 7 at the lower end of the suspension bolt 6 at the position based on the design of strength calculation, sufficient protection of the protective net 12 is possible and the protective net 12 It is possible to maintain the net support strength that can withstand the load of the dropped object received.

  When hanging the suspension bolt 6 vertically from the reinforced concrete surface 2 of the top surface provided above the ceiling surface 1a, the suspension bolt 6 is vertically installed via the bolt suspension mechanism 21 on the steel 3 of H-shaped steel as the ceiling back steel frame. Do. The bolt suspension mechanism 21 is, as shown in FIGS. 6 and 7, a substantially U-shaped bolt connector 18 of one side extending and fittingly fixed to a horizontal side plate 3d of a steel 3 of H-shaped steel A substantially square connector 20 fitted and fixed to a portion, and a substantially L-shaped bolt fixing member 19 joined to the tip end surface of the connector 20 and screwed to the upper end of the suspension bolt 6 are configured.

Specific embodiments of the present invention will be described in detail with reference to FIGS.
FIGS. 1-13 is each drawing which shows the whole, the part, and a waist part which show the protection net tensioning structure which concerns on embodiment of this invention.

The protection net stretching structure 100 of the present invention comprises a reinforced concrete surface 2 constituting a wall surface and a top surface of a building, a ceiling surface 1a of an indoor space provided below the reinforced concrete surface 2 of the top surface, and a reinforced concrete surface of the top surface An annular portion formed by folding back the connection joint wire 11 and the connection joint wire 11 inserted through the hanging bolt 6 vertically installed in 2, the wire passing metal fitting 7 connected to the lower end of the hanging bolt 6, and the wire passing metal fitting 7 A net support wire unit W composed of a net attachment wire 9 or the like connected to the annular portion 11 a via the connection fitting 8 a or 11 a, an annular binding wire 13 connected to the net attachment wire 9, and a binding wire 13 It comprises with the protection net 12 attached.
Moreover, in the room in which the protective net 12 is stretched, the net support wire unit W is placed in a grid shape at a position based on the design of strength calculation able to withstand the load load of the falling objects in the room below the protective net 12 as necessary. The crossing portion of the net supporting wire unit W is suspended by the lifting bolt 6 on the reinforced concrete surface 2 above.

  The building comprises a steel material 3 as a frame, and along the steel material 3, a reinforced concrete surface 2 of a top surface and a wall surface concrete 2 'are formed of reinforced concrete. The steel material 3 is comprised by H-type steel, C-type steel, and a pipe truss, as shown to FIG. In the steel material 3, a ceiling suspension bolt 6 is provided vertically on the lower surface, a field edge receptacle is connected to the lower end of the bolt 6, and the field edge is connected in a direction perpendicular to the underside of the field edge receptacle. It is comprised in the planar view grid | lattice form with an edge support and a field edge.

  The ceiling surface 1a is connected and fixed to the lower surface of the field edge with a screw or the like. The ceiling surface 1a is formed in substantially the same shape as the reinforced concrete surface 2 of the top surface. The ceiling surface 1a is desirably made of a lightweight member so that the ceiling surface 1a does not fall due to the weight of the members constituting the ceiling surface. For example, the ceiling surface 1a is made of gypsum board.

  A plurality of holes 2a are bored in the reinforced concrete surface 2 of the top surface, and a cylindrical post-construction anchor 4 is embedded in the holes 2a. The post-installed anchor 4 is a female screw in which a hollow inner peripheral surface is helically screwed, and as shown in FIG. 2, a suspension having a male screw structure in which one end is helically screwed The bolt 6 is screwed.

Further, in the ceiling surface 1a, a hole 1d having substantially the same diameter as the hole 2a is drilled at a position opposite to the holes 2a drilled in the reinforced concrete surface 2 of the top surface. In the hole 1d drilled in the ceiling surface 1a, a suspension bolt 6 hanging from the reinforced concrete surface 2 of the top surface is inserted. In addition, a wire passing metal fitting 7 is connected to the other end of the suspension bolt 6.
Although the suspension bolt 6 is embedded in the reinforced concrete surface 2 of the top surface in FIG. 2 and then screwed to the construction anchor 4, the suspension bolt 6 is not limited to this fixing form, and FIGS. It is good also as composition hung on steel materials 3 constituted as a frame of a building as shown in 8 via bolt suspension mechanism 21. As shown in FIGS. 6 and 7, this bolt suspension mechanism 21 is bolted to one side where a U-shaped bolt connector 18 whose one side is extended is fitted to the horizontal side plate 3d of the H-shaped steel of the steel 3 and extended. The fixtures 18 are integrally connected in a row, and the head of the suspension bolt 6 is screwed to the bolt connector 18 so that the suspension bolt 6 is vertically installed.
Further, as shown in FIG. 9, the suspension bolt 6 may be vertically provided on the cylindrical steel material 3 provided on the reinforced concrete surface 2 of the top surface.

  As shown in FIGS. 2 and 5, the wire passing metal fitting 7 is provided with a metal annular portion 7a formed in an annular shape, and the metal joint portion 7a, the connection joint wire 11, the net attachment wire 9, and the end portion are formed on the metal annular portion 7a. A net support wire unit W formed of the joint wire 14 and the connection fitting 8 is inserted.

  As shown in FIG. 2, the connection joint wire 11 has a configuration in which a plurality of metal wires are twisted and bundled, and both end portions are folded back to form a circular ring portion 11a. The annular portion 11 a is connected to the annular connection fitting 8, and is connected to the net attachment wire 9 via the connection fitting 8.

As shown in FIG. 4 and FIG. 12, the net attachment wire 9 is configured as a single wire wire by twist-bunching a plurality of metal wires in the same manner as the connection joint wire 11. In addition, the net attachment wire 9 is formed in a lattice shape with a fixed interval, one end of each is connected to the connection fitting 8 and the other end is connected to the wall concrete 2 'via the end joint wire 14 It is connected.
In the wall surface concrete 2 ', holes 2b are bored at a plurality of locations in the same manner as the reinforced concrete surface 2 of the ceiling, and the post construction anchor 4 is embedded in the holes 2b. This post-construction anchor 4 is screwed with an eyebolt 17 having an annular coupling portion, and an annular coupling portion formed on both ends of the end joint wire 14 is engaged with the annular coupling portion of the eyebolt 17 doing. With such a configuration, the net attachment wire 9 can be securely fixed to the wall concrete 2 '.
In addition, as shown in FIG. 3, the net attachment wire 9 is a wire in which a suspension bolt 6 is vertically provided on the lower surface of the reinforced concrete surface 2 at the top surface near the connection portion with wall surface concrete 2 ′ The connection fixing may be performed by engaging the ring portion 14 a of the end joint wire 14 with the metal ring portion 7 a of the through fitting 7.
Further, as shown in FIG. 5, the net attachment wire 9 has a hole 2 a drilled in the side portion of the reinforced concrete surface 2 on the top surface, and the post construction anchor 4 is embedded in the hole 2 a. A hanging bolt 6 is vertically installed via a bolted substantially L-shaped bolt fixing member 19, and the metal ring 7 a of the wire passing metal fitting 7 connected to the tip of the hanging bolt 6 is an annular ring of the end joint wire 14 It may be connected and fixed by engaging the part 14a.
In addition, as shown in FIG. 10, another connection structure of the net attachment wire 9 with the wall surface concrete 2 ′ is configured to be connected to the connection portion of the eyebolt 17 installed in the wall surface concrete 2 ′ through the connection fitting 8 or As shown in FIG. 11, even in a fixture 22 having a substantially U-shaped connecting part on wall surface concrete 2 ', the connecting part of the fixing tool 19 may be connected and fixed via a connection fitting 8. Good.

In addition, in the room where the protective net 12 is stretched, the net support wire unit W is placed in a grid shape at a position based on the design of strength calculation that can bear the load load of the falling objects in the room below the protective net 12 as necessary. , And the crossing portion of the net support wire unit W is suspended by the suspension bolt 6 on the reinforced concrete surface 2 above, and the net constituting the net support wire unit W is characterized in that The attachment wire 9 is connected to the end of the protective net 12 formed in a substantially rectangular shape in a plan view by the binding wire 13, and the state change of the net attachment wire 9 interlocks with the state change of the protective net 12. For example, when the net attachment wire 9 is in a tension state, the protection net 12 is in a tension state, and when the net attachment wire 9 is in a relaxation state, the protection net 12 is also in a relaxation state.
Further, as shown in FIG. 2, the net attachment wire 9 is connected to the connection joint wire 11 via the connection fitting 8, and the connection joint is made according to the entire circumferential length of the annular portion 11 a at both ends of the connection joint wire 11. The entire length of the wire 11 can be adjusted. Accordingly, when the entire circumferential length of the annular portion 11a of the connection joint wire 11 is increased, the total length of the connection joint wire 11 is shortened, and the protection wire 12 can be in tension and the protection net 12 can be in tension.
Further, if the entire circumferential length of the annular portion 11a at both ends of the connection joint wire 11 is shortened, the total length as the connection joint wire 11 becomes longer, the net attachment wire 9 is in a relaxed state, and the protective net 12 is similarly relaxed. .

Further, the protective net 12 is connected and fixed to the net attachment wire 9 by a binding wire 13 as a required means. The binding wire 13 is a string made of stainless steel and can be connected and fixed by surrounding the outer periphery with the binding wire 13 in a state where the net attachment wire 9 and the protective net 12 are bundled. In the binding wire 13, the protective net 12 is fixed to the net attachment wire 9, and it is sufficient if the tension / relaxation state of the net attachment wire 9 and its tension state can be adjusted in conjunction with each other. .
The material of the binding wire 13 is not limited to stainless steel, and any material may be used as long as the binding wire 13 is cut and the protection net 12 does not fall downward when a load is applied to the protection net 12, for example And may be composed of blunted iron wire.

As described above, the post construction anchor 4 is embedded in the reinforced concrete surface 2 of the top surface of the protective net stretching structure 100, and then the suspension bolt 6 is screwed to the construction anchor 4, whereby the lower end of the suspension bolt 6 is It is possible to easily support the central portion of the connection joint wire 11 as the net support wire unit W inserted into the wire passing metal fitting 7 provided in the portion. Moreover, this structure can change support strength according to the number of the holes 2a drilled in the reinforced concrete surface 2 of a top surface. That is, according to the number of holes 2a to be drilled in the reinforced concrete surface 2 of the top surface, the post-construction anchor 4 is embedded in the reinforced concrete surface 2, and the suspension bolt 6 is screwed in the post-construction anchor 4 Therefore, when the number of the holes 2a increases, the number of the wire through-fittings 7 provided at the lower end of the suspension bolt 6 increases as well, and the location for supporting the connection joint wire 11 passing through the wire passing through-fittings 7 increases. The strength of supporting the net attachment wire 9 is improved.
The wire passing metal fitting 7 not only supports the connection joint wire 11 but also penetrates the net attachment wire 9 to support the net attachment wire 9 directly. A support mechanism when tensile force is generated in the protective net 12 It may be arranged to function as

In addition, the net attachment wire 9 has its end connected to the connection joint wire 11 via the connection fitting 8, and by adjusting the length of the annular portion 11 a of the connection joint wire 11, the net attachment wire 9 is stretched. The degree can be adjusted appropriately. That is, when the tensile force is insufficient, the tensile force of the net attachment wire 9 is increased by enlarging the annular shape of the annular portion 11 a and shortening the total length of the connection joint wire 11. In addition, when the tensile force is excessive, the tensile force of the net attachment wire 9 is reduced by reducing the annular shape of the annular portion 11 a and lengthening the total length of the connection joint wire 11.
Therefore, the protective net stretching structure 100 is adjusted by adjusting the number of the suspension bolts 6 vertically provided on the reinforced concrete surface 2 of the top surface, the number of the connection joint wire 11, and the entire circumferential length of the annular portion 11a of the connection joint wire 11. The protective net 12 provided below the ceiling surface 1a can be installed so as to have an appropriate tensile state and tensile strength.

As another method of adjusting the tensile force of the net attachment wire 9, the turnbuckle 10 may be used in combination with the connection joint wire 11.
The turnbuckle 10 is configured by screwing an eyebolt 10b at both ends of the turnbuckle main body 10a for tensioning and the turnbuckle main body 10a.
As shown in FIG. 13, one end of the turnbuckle main body 10 a is connected and fixed to the wire passing metal fitting 7 connected to the lower end of the suspension bolt 6 via the connecting metal fitting 8, and the other end is connected to the net mounting wire 9. It is linked through eight.

By configuring in this manner, when the tensile force of the protective net 12 is insufficient, the turnbuckle main body 10a connected to the wire passing metal fitting 7 is rotated in the tightening direction of the eyebolt 10b screwed to the turnbuckle main body 10a. Can apply tension to the net attachment wire 9 to create a predetermined tension on the protective net 12.
In addition, when the tensile force of the protective net 12 is excessive, the net attachment wire 9 is pulled by rotating the turnbuckle main body 10a connected to the wire passing metal fitting 7 in a direction in which the eyebolt 10b screwed to the turnbuckle main body 10a is loosened. By weakening the force, the protective net 12 can be adjusted to a predetermined tension.

  As described above, by installing the turnbuckle 10 between the wire passing metal fitting 7 and the net attachment wire 9, the net attachment wire 9 is adjusted by adjusting the entire circumferential length of the annular portion 11 a of the connection joint wire 11. The tension is adjusted, and the tension applied to the protective net 12 is finely adjusted by using the turnbuckle 10 in an auxiliary manner to make it easy to apply a predetermined tension to the protective net 12. Further, when the tension of the turnbuckle 10 is loosened, the tension of the protective net 12 can be supported by the net support wire unit W.

  The present invention is not limited to the above-described embodiment, but includes the configurations disclosed in the above-described embodiments, in which the respective configurations disclosed in the above-described embodiments are mutually replaced or the combination is changed A configuration in which each configuration is replaced with each other or a combination is changed is also included. Further, the technical scope of the present invention is not limited to the embodiments described above, but extends to the matters described in the claims and the equivalents thereof.

S Net support framework W Net support wire unit W1 Intermediate net support wire unit 1a Ceiling surface 1d hole 2 reinforced concrete surface 2 'wall concrete 2a, 2b hole 3 steel 3d horizontal side plate 4 after construction anchor 6 suspension bolt 7 wire threading metal 7a metal Ring 8 Connection bracket 9 Net mounting wire 10 Turnbuckle 10a Turnbuckle main body 10b Eye bolt 11 Connection joint wire 11a Ring portion 12 Protective net 13 Binding wire 14 End joint wire 14a Ring portion 17 Eye bolt 18 Bolt connector 19 bolt Fixing device 20 Connecting device 21 Bolt lifting mechanism 22 Fixing device 100 Protective net stretching structure

Claims (3)

It is a net tensioning structure for tensioning protection net 12 below an object that may fall into the room at the time of an earthquake, and the net tension structure has the following configuration. .
That is,
An annular wire threading fitting 7 is connected to the lower end of the suspension bolt 6 suspended from the reinforced concrete surface 2 provided above the ceiling,
The connection joint wire 11 constituting the net support wire unit W is inserted into the wire passing metal fitting 7,
Both ends of the connection joint wire 11 are folded back to form a circular ring portion,
The net attachment wire 9 is connected to the annular portion through the annular connection fitting 8;
The free end of the wire 9 is directly attached to the existing reinforced concrete surface 2, and a net support wire unit W is constituted by the connection joint wire 11, the connection fitting 8 and the net attachment wire 9,
Furthermore, the protective net 12 is attached and fixed to the net attachment wire 9 via the binding wire 13,
Moreover, in the room in which the protective net 12 is stretched, the net support wire unit W is placed in a grid shape at a position based on the design of strength calculation able to withstand the load load of the falling objects in the room below the protective net 12 as necessary. , And the crossing portion of the net support wire unit W is suspended by the suspension bolt 6 on the reinforced concrete surface 2 above.   The protective net 12 is attached at a position matched to the design of the strength calculation of the net mounting wire 9 by aligning the square with the net mounting wire 9, and the end and overlapping portion of the protective net 12 are properly corrected with the end joint wire 14 The protective net tensioning structure according to claim 1, wherein the protective net 12 is bound to the net attachment wire 9 through the binding wires 13, respectively. The wire threading fitting 7 is connected to one end of the turnbuckle 10 through the connection fitting 8,
The protective net tensioning structure according to claim 1 or 2, wherein the other end of the turnbuckle 10 is connected to the net attachment wire 9 through the connection fitting 8.

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