JP2015110889A - Construction method and fixture for construction of guard fence - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable an operator to perform the coupling operation of a support post with a horizontal rail by oneself by temporarily placing a panel in a stable state between support posts.SOLUTION: In a construction method of a guard fence (1), a panel has a pair of upper and lower horizontal rails (21) and a plurality of vertical rails (22) bridged between both horizontal rails, and a bracket is mounted on a support post such that the outer peripheral part of the support post is surrounded, and formed with a support post mounting part (31) partially having a missing part (31a) and a pair of horizontal rail coupling parts (32) extended from both ends of the support post mounting part for coupling the horizontal rails. The construction method of the guard fence (1) includes the steps of: mounting the support post mounting part of the bracket on the support post; mounting a fixture (40) for construction on both horizontal rail coupling parts to prevent the opening of both horizontal rail coupling parts; inserting the end parts of the horizontal rails between both horizontal rail coupling parts of the bracket; and coupling and fixing both horizontal rail coupling parts with the horizontal rails by a fastener.

Description

  The present invention relates to a method for constructing a protective fence installed at a boundary between a sidewalk and a road, a site boundary, and the like, and a construction jig used for construction of the protective fence.

  As this type of protective fence, there is known a structure in which struts erected on the ground surface with appropriate intervals and panels provided between adjacent struts are connected and fixed to each other via a bracket. Yes. The panel has a pair of upper and lower horizontal bars and a plurality of vertical bars (vertical lattices) that connect the upper and lower horizontal bars, and both ends of each horizontal bar are connected and fixed to adjacent columns.

As shown in FIGS. 19 and 20, the bracket 90 is vertically extended from both ends of a substantially annular (C-shaped) column mounting part 91 having a missing part 91 a in a plan view and the missing part 91 a of the column mounting part 91. A pair of horizontal beam connecting portions 92 extending on both sides of the horizontal beam 21 of the lattice panel 20. The connection and fixation between the vertical lattice panel 20 and the support column 10 is as follows.
Process 1: The support | pillar attaching part 91 of the bracket 90 is fitted to the support | pillar 10,
Step 2: Insert the end of the horizontal beam 21 between the both horizontal beam connecting portions 92 of the bracket 90, and temporarily place the panel 20 between the two columns 10,
Step 3: In a state where the both horizontal beam connecting portions 92 are pressed from both sides to narrow the opening of the both horizontal beam connecting portions 92, the bolts 36 are inserted into the bolt insertion holes 92a and 21a of the both horizontal beam connecting portions 92 and the horizontal beam 21. Insertion,
Step 4: This is done by attaching a washer 37 and a nut 38 to the bolt 36 and tightening.

  When the horizontal beam 21 and the column 10 are connected and fixed by the above-described process, one worker accommodates a part of the vertical lattice panel 20 in the bracket 90 and maintains the state, and another worker inserts the bolt. Bolts 36 were inserted into the holes 92a and 21a and tightened with washers 37 and nuts 38. Therefore, since all workers are blocked by their own work alone, both tasks cannot be performed alone, and if at least two workers are not present, a protective fence can be assembled. could not. Therefore, it was difficult to improve the construction efficiency.

  Therefore, the present invention has been made in view of the above problems, and the panel can be temporarily placed in a stable state between the columns. In this state, an operator can perform the connection work between the column and the horizontal beam alone. An object of the present invention is to provide a construction method for a protective fence that can be carried out with good construction efficiency and a construction jig suitable for the construction method.

  In order to solve the above-described problems, the present invention provides a method for constructing a protective fence in which a support column and a panel are connected and fixed to each other by a bracket, and the panel extends between a pair of upper and lower horizontal rails and both horizontal rails. A plurality of vertical rails passed, and the bracket is attached to the column so as to surround the outer periphery of the column, and a column mounting part having a missing portion in part, and from both ends of the column mounting unit A pair of horizontal beam connecting portions that extend and connect the horizontal beam, and a step of attaching the column mounting portion of the bracket to the column, and a mounting jig attached to both horizontal beam connecting portions. A step of preventing the opening of the crosspiece connecting portion, a step of inserting the end portions of the horizontal crosspieces between the both horizontal crosspiece connecting portions of the bracket, and the both crosspiece connecting portions and the horizontal crosspieces by a fastener. And connecting and fixing.

  According to the above construction method, the panel can be temporarily placed in a stable state between the two columns by attaching the construction jig to the both lateral beam connecting portions of the bracket. In this state, a single worker can perform the work of connecting the column and the crosspiece to each other.

Moreover, it is preferable to hold down the opening of each horizontal beam connecting part from the left-right direction of each horizontal beam connecting part by the construction jig.
Thereby, since both the cross rail connecting portions can be kept pressed from both sides, the bracket can be prevented from being inclined, and the panel can be temporarily placed between the two columns in a stable state. And since the both horizontal beam connecting parts of the bracket are kept compressed from both sides, the operation of connecting the both horizontal beam connecting parts and the horizontal beam to each other can be performed by one worker.

Moreover, it is preferable that each horizontal beam connecting portion is pressed from the vertical direction of each horizontal beam connecting portion by the construction jig.
Thereby, since the horizontal rail can be supported by the construction jig, the panel can be temporarily placed in a stable state between the two columns.
Further, since the horizontal rail can be supported by the jig body, it is not necessary to provide a special member or the like on the bracket, so that the processing cost of the bracket can be reduced.

  Moreover, it is preferable that the said horizontal beam is supported in the part which presses down the said horizontal beam connection part in the said construction jig from the downward direction.

  The support is provided with a first engagement portion for positioning and temporarily fixing the bracket, and the support attachment portion of the bracket is engaged with the first engagement portion. A second engaging portion is provided, and the first engaging portion and the second engaging portion are engaged with each other to temporarily fix the bracket to the support column. preferable.

  In addition, the first engagement portion is a recess or a through hole formed in a side portion of the support column, and the second engagement portion is attached to the support column so as to engage with the recess or the through hole. It is preferable that it is a nail | claw part formed in the part.

  When the bracket is in a natural state, the bracket is opened so that the interval between the horizontal beam connecting portions is enlarged. When the bracket is pressed by the construction jig, the extending directions of the horizontal beam connecting portions are substantially parallel to each other. It is preferable to become.

  Moreover, this invention is a construction jig used for the construction method of a protective fence, Comprising: The opening of each horizontal beam connection part contacts the side surface of each horizontal beam connection part, and prevents the opening of both horizontal beam connection parts. And a buffer body interposed between the jig body and the bracket. The jig body includes a pair of contact parts and a connecting part that connects the contact parts.

  By using the above-mentioned construction jig, the bracket's support mounting part comes into close contact with the support by pressing the side rail connecting part of the bracket from both sides, so the restraining force of the bracket is improved and the panel is fixed to both support It can be temporarily placed in a stable state. Therefore, it is possible to perform the construction work of the protective fence, which has conventionally been performed by at least two workers, by one worker.

  Further, the present invention provides a pair of abutting portions that abut the opening of each horizontal beam connecting portion against the upper and lower ends of each horizontal beam connecting portion, a connecting portion that connects both the abutting portions, and one abutting portion. A jig main body provided between the jig main body and the bracket, the jig main body having a support portion that supports an end portion of the horizontal crosspiece provided between the horizontal crosspiece connecting portions of the bracket. And a buffer.

  By using the construction jig, the horizontal rail can be supported by the support portion of the jig body, so that the panel can be temporarily placed between the two columns in a stable state. Therefore, it is possible to perform the construction work of the protective fence, which has conventionally been performed by at least two workers, by one worker. Further, since the horizontal rail can be supported by the jig body, it is not necessary to provide a special member or the like on the bracket, so that the processing cost of the bracket can be reduced.

  In the construction jig of the present invention, it is preferable that the buffer body extends outside the periphery of the jig body.

  According to the above configuration, when the construction jig is attached to or detached from the bracket, it is possible to prevent the occurrence of a problem that the surface of the bracket is damaged due to contact with the jig main body and the paint is peeled off.

  Moreover, it is preferable that the said buffer body is formed from the elastic material.

  According to the above configuration, even when an impact is applied from the outside, the shock absorber can be elastically deformed to absorb the impact, so that it is possible to prevent damage to the bracket and the cross rail.

  According to the present invention, the panel can be temporarily placed between the columns in a stable state, and in this state, the worker can perform the connection work between the columns and the crosspieces alone. Can be improved.

It is a front view of a protection fence. It is a front view of the vertical lattice panel of a protection fence. It is a partial fracture perspective view of a vertical lattice panel. (A) is a perspective view of the bracket of a guard fence, (B) is a top view of the bracket of a guard fence. It is a side view of a bracket. It is a rear view of a bracket. It is a top perspective view of the support fence post. It is sectional drawing which shows the state which temporarily fastened one bracket to the upper part of a support | pillar. It is sectional drawing which shows the state which temporarily fastened two brackets to the upper part of a support | pillar. It is a perspective view of the construction jig of the present invention. It is a side view of the jig for construction. It is a front view of the jig for construction. FIG. 3 is a perspective view of a bracket and a construction jig in the first embodiment. It is a principal part perspective view of the protection fence in the middle of construction by the construction method of this invention. It is a principal part side view of the protection fence in the middle of construction by the construction method of this invention. It is a perspective view of the bracket and construction jig in a 2nd embodiment. It is a principal part perspective view of the protection fence in the middle of construction by the construction method of this invention. It is a principal part perspective view of the protection fence in the middle of construction by the construction method of this invention. It is a principal part disassembled perspective view of the protection fence in the middle of construction by the conventional construction method. It is a principal part disassembled perspective view of the protection fence which shows the problem in the conventional construction method.

  Hereinafter, the best mode for carrying out the present invention will be described. First, a description will be given of a protective fence and a construction jig that are objects of the construction method of the present invention, and then a construction method of the protective fence will be described.

<First Embodiment>
[Protective fence structure]
As shown in FIG. 1 to FIG. 3, the protective fence 1 includes a support column 10 standing on the ground E with an appropriate interval, and a vertical grid panel (panel) 20 provided between adjacent columns 10. Are connected and fixed to each other via a bracket 30.

(Support)
The column 10 is a metal tube formed in a cylindrical shape, and one end is embedded in the ground E. For example, a plurality of support columns 10 are erected along the boundary line between the roadway and the sidewalk. Two circular through holes (first engagement portions) 10a for positioning and temporarily fixing the bracket 30 are formed in the vicinity of the upper end portion and the lower end portion of the support column 10 so as to face each other. (FIGS. 7-9).

(Vertical lattice panel)
The vertical grid panel 20 is formed in a rectangular shape in plan view, and has a pair of upper and lower horizontal bars (same edges) 21 and a plurality of vertical bars (vertical grids) 22 connecting the upper and lower horizontal bars 21 ( 2 and 3), both ends of each crosspiece 21 are connected and fixed to the adjacent columns 10, respectively.
The crosspiece 21 is a substantially cylindrical straight pipe formed by bending a metal plate, and has a slit 21s having a constant width along the longitudinal direction as shown in FIG. Bolt insertion holes 21a used for connection with the bracket 30 are formed in the vicinity of both ends of the horizontal rail 21 (FIGS. 2 and 3). Both horizontal rails 21 are arranged in parallel with each other so that the slits 21s face each other. In both horizontal bars 21, the interval between the vertical bars 22 is maintained at an equal interval, and all the vertical bars 22 are held in a parallel posture so as to be rotatable in the extending direction of the slits 21s. A holding material is provided.
The vertical rail 22 is a metal tube formed in a cylindrical shape, and both ends are crushed and formed in a plate shape. Both ends of the vertical beam 22 are fitted in the slits 21s of the horizontal beam 21, respectively.

(bracket)
As shown in FIGS. 4 to 6, the bracket 30 is attached to the support column 10 so as to surround the outer peripheral portion of the support column 10, and is attached to a substantially annular (C-shaped) support in a plan view having a missing portion 31 a in part. And a pair of horizontal beam connecting portions 32 that extend outward from both ends of the missing portion 31 a of the column attachment portion 31 and connect the horizontal beam 21.
The column attachment portion 31 is provided with a claw portion (second engagement portion) 31 b that engages with the through hole 10 a of the column 10.
A bolt insertion hole (fastener insertion hole) 32 a that is used for connection to the horizontal beam 21 is formed at the tip of each horizontal beam connection portion 32. At both upper and lower end portions of each crosspiece connecting portion 32, receiving plate portions 32b are formed that are bent in an L shape (right angle) on the inside. These receiving plate portions 32 b are formed as stoppers so that the horizontal rail 21 does not deviate in the vertical direction from the bracket 30. Reinforcing ribs (beads) 32 c are formed in each horizontal beam connecting portion 32. A part of the reinforcing rib 32 c extends to the column attachment portion 31. When the bracket 30 is in a natural state, the bracket 30 is open so that the distance between the two cross rail connecting portions 32 increases as shown in FIG. In other words, the both side rail connecting portions 32 are open in a substantially C shape in plan view.

  As shown in FIGS. 8 and 9, the claw portion 31 b is fitted into the through-hole 10 a formed in the support column 10, thereby preventing the bracket 30 from falling. Here, since the claw portion 31 b is provided at one place of the bracket 30, the bracket 30 is inclined with respect to the column 10, but the substantially annular inner wall of the column mounting portion 31 contacts the outer peripheral surface of the column 10. Therefore, it does not tilt greatly. As a result, the bracket 30 is held at the position of the through hole 10 a while being slightly inclined with respect to the column 10.

[Construction jig structure]
Next, the construction jig 40 will be described.
As shown in FIGS. 10 to 12, the construction jig 40 has a pair of parallel abutting portions 41 a that abut against the outer surface portion of the both horizontal beam connecting portions 32 and prevent the both horizontal beam connecting portions 32 from opening. And a connecting portion 41b for connecting both abutting portions 41a, and an iron U-shaped jig body 41 formed integrally with the jig body 41, and when the jig body 41 is attached to the bracket 30, A buffer body 42 is provided between the inner surface and the bracket 30. The buffer body 42 is a flexible elastic member made of rubber bonded to the inner surface of the jig body 41. The buffer body 42 extends greatly so as to project outside the periphery of the jig body 41.

By using this construction jig 40, the both side beam connecting portions 32 of the bracket 30 opened in a C-shape are compressed from both sides and kept parallel, so that the column mounting portions 31 of the bracket 30 are Since it is in close contact with the column 10, the restraining force of the bracket 30 is improved, and the vertical grid panel 20 can be temporarily placed between the columns 10 in a stable state. Thereby, since both the cross rail connection part 32 of the bracket 30 does not incline, the vertical lattice panel 20 becomes difficult to fall. Moreover, since the axis | shaft of the volt | bolt 36 does not incline with respect to the volt | bolt insertion hole 32a of a horizontal rail, it becomes easy to insert the volt | bolt 36 in the volt | bolt insertion hole 32a.
Therefore, it is possible to carry out the construction work of the protective fence 1 which has conventionally been performed by at least two workers by one worker. Further, since the rubber shock absorber 42 extends so as to protrude outside the jig body 41, the jig body 41 does not directly contact the bracket 30, and the construction jig 40 is attached to the bracket. When being attached to or removed from the 30, it is possible to prevent the occurrence of a problem that the surface of the bracket 30 is damaged due to contact with the jig body 41 and the coating is peeled off.
In the above embodiment, the construction jig 40 having the U-shaped jig main body 41 is illustrated, but the shape of the jig main body 41 is appropriately changed according to the shape of the cross beam connecting portion 32 of the bracket 30. Can do. For example, when the horizontal rail connecting portion 32 of the bracket 30 is rounded, the jig body 41 may be designed to be rounded accordingly.

[Protective fence construction method]
Next, the construction method of the guard fence 1 will be described with reference to FIGS.
The vertical lattice panel 20 is attached to the protective fence 1 by the following steps 1 to 5.

Process 1: The support | pillar attaching part 31 of the bracket 30 is fitted to the support | pillar 10. FIG. The bracket 30 is temporarily fastened to the column 10 by engaging the through hole 10a of the column 10 and the claw portion 31b of the bracket 30 (FIGS. 8 and 9).
Step 2: The construction jig 40 is attached from above to the both side rail connecting portions 32 of the bracket 30 (FIG. 13). By attaching the construction jig 40, both the cross beam connecting portions 32 are kept pressed from both sides (the downstream side in the direction in which the horizontal beam connecting portions 32 are to be opened). That is, both side surface portions in the horizontal direction of both the cross rail connecting portions 32 are kept substantially parallel to each other.
Step 3: Insert the end of the horizontal beam 21 between the both horizontal beam connecting portions 32 of the bracket 30. The vertical lattice panel 20 is temporarily placed between the adjacent struts 10 by performing Step 1 to Step 3 for all the connecting portions (four places) between the struts 10 and the vertical lattice panels 20.
Step 4: With the vertical grid panel 20 temporarily placed between adjacent columns 10, as shown in FIG. 14, the bolt insertion holes 32 a and 21 a of bolts 36 of the horizontal rails 21 and the horizontal rails 21 are inserted. The washer 37 and the nut 38 are attached to the body of the bolt 36 and tightened to fix the both side beam connecting portions 32 and the side beam 21 to each other. At this time, the column attachment portion 31 is pressure-bonded to the column 10 and the bracket 30 is fixed to the column 10. As a result, the column 10 and the crosspiece 21 are connected and fixed to each other via the bracket 30. FIG. 15 shows the state at this time.
Step 5: Remove the construction jig 40 from the bracket 30.

According to the above construction method, in step 2, by attaching the construction jig 40 to the both horizontal beam connecting portions 32 of the bracket 30, the both horizontal beam connecting portions 32 are opened on both sides (the horizontal beam connecting portion 32 tries to open). Since the bracket 30 is prevented from being inclined, the vertical lattice panel 20 is temporarily placed between the two columns 10 in a stable state in step 3. be able to.
In addition, since both the cross beam connecting portions 32 of the bracket 30 are kept compressed from both sides, the work of fixing the both cross beam connecting portions 32 and the cross beam 21 to each other in the step 4 is performed by one person. It can be done by a member. On the other hand, conventionally, one worker compresses both side beam connecting portions 32 from both sides with both hands and narrows the opening of both side beam connecting portions 32, and another worker connects both side beam connections. Since it was necessary to insert the bolt 36 into the bolt insertion holes 32a and 21a of the section 32 and the horizontal rail 21, the protective fence 1 could not be assembled unless at least two workers were working. Therefore, construction efficiency can be improved compared with the past.

<Second Embodiment>
Next, a second embodiment of the present invention will be described. The second embodiment differs from the first embodiment in the construction of the construction jig and the bracket. Therefore, hereinafter, differences from the first embodiment will be described, and description of the same configuration as that of the first embodiment will be omitted.
As shown in FIGS. 16 to 18, two brackets 50 and 60 are provided at the upper end portion of the column 10.
The bracket 50 is attached to the support column 10 so as to surround the outer periphery of the support column 10, and has a substantially annular (C-shaped) support mounting portion 51 having a missing portion 51 a in a part thereof, and a lack of the support mounting portion 51. A pair of horizontal beam connecting portions 52 that extend outward from both ends of the portion 51 a and connect the horizontal beam 21.
The column attachment portion 51 is provided with a cap portion 53 for covering and locking the bracket 50 on the upper end portion of the column 10. The cap part 53 is formed in a cylindrical shape, and the upper end is closed and formed in a lid shape.
A bolt insertion hole (fastener insertion hole) 52 a used for connection to the horizontal beam 21 is formed at the tip of each horizontal beam connection portion 52. Reinforcing ribs (beads) 52 c are formed in each horizontal beam connecting portion 52. A part of the reinforcing rib 52 c extends to the column attachment portion 51. Each crosspiece connecting portion 52 is formed so that its surface direction is parallel.

The bracket 60 is attached to the support column 10 so as to surround the outer periphery of the support column 10, and is provided adjacent to the lower portion of the bracket 50. The bracket 60 extends outward from both ends of the substantially circular (C-shaped) column mounting part 61 having a missing part 61 a in a plan view and the missing part 61 a of the column mounting part 61, and connects the horizontal beam 21. A pair of horizontal rail connecting portions 62.
The column attachment portion 61 is provided with a claw portion (second engagement portion, not shown) that engages with the through hole 10 a of the column 10.
A bolt insertion hole (fastener insertion hole) 62 a used for connection to the horizontal rail 21 is formed at the tip of each horizontal rail connection portion 62. Reinforcing ribs (beads) 62 c are formed in each horizontal beam connecting portion 62. A part of the reinforcing rib 62 c extends to the column attachment portion 61. Each crosspiece connecting portion 62 is formed so that its surface direction is parallel.

The construction jig 70 includes a pair of parallel abutment portions 71a that abut against the upper and lower end portions of the horizontal beam connecting portions 52, 62 and prevent the horizontal beam connecting portions 52, 62 from opening, The connecting portion 71b that connects the abutting portion 71a and the end portion of the horizontal beam 21 that is provided on one of the abutting portions 71a and is inserted between the horizontal beam connecting portions 52 and 62 of the brackets 50 and 60 are connected to each other. An iron U-shaped jig main body 71 integrally formed with the support portion 71c, and an inner surface of the jig main body 71 and the brackets 50, 60 when mounted on the brackets 50, 60. And a buffer 72 interposed therebetween.
The support portion 71c is formed on the same plane as the one contact portion 71a, and is formed integrally with the contact portion 71a and the connecting portion 71b. The support portion 71c is formed so as to extend in the extending direction of the horizontal rail 21 connected to the horizontal rail connecting portions 52 and 62, and enables the horizontal rail 21 to be temporarily placed.
The buffer body 72 is a flexible elastic member made of rubber bonded to the inner surface of the jig body 71. The buffer body 72 extends greatly so as to protrude outward from the peripheral edges of the contact portion 71a and the connecting portion 71b.

By using this construction jig 70, the vertical grid panel 20 can be temporarily placed in a stable state between the two supports 10, and the protective fence 1 that has been conventionally carried out by at least two workers is used. Construction work can be performed by one worker. Moreover, since it is not necessary to provide the receiving plate part 32b like 1st Embodiment in the brackets 50 and 60, the effort of processing the brackets 50 and 60 is also reduced. In addition, by forming the one abutting portion 71a larger than the other abutting portion 71a, the horizontal rail 21 can be temporarily placed with the expanded portion as the support portion 71c. The construction work of the protective fence 1 can be performed by one worker.
In the above embodiment, the construction jig 70 having the U-shaped jig body 71 is illustrated, but the shape of the jig body 71 is the shape of the horizontal beam connecting portions 52 and 62 of the brackets 50 and 60. It can be changed accordingly. For example, when the crosspiece connecting portions 52 and 62 of the brackets 50 and 60 are rounded, the jig body 71 may be designed to be rounded accordingly.

[Protective fence construction method]
Next, the construction method of the protection fence 1 is demonstrated.
Attachment of the vertical lattice panel 20 using the brackets 50 and 60 in the protective fence 1 is performed by the following process A to process J.

Process A: The support | pillar attaching part 61 of the bracket 60 is fitted to the support | pillar 10. FIG. The bracket 60 is temporarily fastened to the column 10 by engaging the through hole 10a of the column 10 and the claw portion (not shown) of the bracket 60 (FIGS. 17 and 18).
Step B: The construction jig 70 is attached to the both side rail connecting portions 62 of the bracket 60 from the lateral direction (FIGS. 17 and 18). At that time, the contact portion 71a on which the support portion 71c is provided is placed downward. By attaching the construction jig 70 from the lateral direction, the support portion 71 c is disposed below the space between the two cross rail connecting portions 62.
Step C: Insert the end portion of the cross beam 21 between the both cross beam connecting portions 62 of the bracket 60. The vertical lattice panel 20 is temporarily placed between the adjacent struts 10 by performing Step 1 to Step C for all the connection portions (four places) between the struts 10 and the vertical lattice panels 20.
Step D: With the vertical grid panel 20 temporarily placed between the adjacent columns 10, the bolts 36 of both the horizontal beam connecting portions 62 and the bolt insertion holes 62 a and 21 a of the horizontal beam 21 are inserted, and the body of the bolt 36 is inserted. By attaching and tightening the washer 37 and the nut 38, both the cross beam connecting portions 62 and the horizontal beam 21 are fixed to each other. At this time, the support post 61 is pressed against the support 10 and the bracket 60 is fixed to the support 10. As a result, the column 10 and the crosspiece 21 are connected and fixed to each other via the bracket 60. 17 and 18 show the state at this time.
Process E: The construction jig 70 is removed from the bracket 60.

Step F: The bracket 50 is temporarily fixed to the support column 10 by covering the upper end of the support column 10 with the cap portion 53 of the bracket 50 (FIGS. 17 and 18).
Process G: The jig 70 for construction is attached to the both horizontal cross link part 52 of the bracket 50 from a horizontal direction (FIG. 17, FIG. 18). At that time, the contact portion 71a on which the support portion 71c is provided is placed downward. By attaching the construction jig 70 from the lateral direction, the support portion 71 c is disposed below the space between the both side rail connecting portions 52.
Step H: Insert the end portion of the cross beam 21 between the both cross beam connecting portions 52 of the bracket 50. The vertical lattice panel 20 is temporarily placed between the adjacent struts 10 by performing the steps F to H for all the connecting portions (four places) between the struts 10 and the vertical lattice panels 20.
Step I: With the vertical grid panel 20 temporarily placed between adjacent struts 10, the bolts 36 of both the horizontal beam connecting portions 52 and the bolt insertion holes 52 a and 21 a of the horizontal beam 21 are inserted, and the body of the bolt 36 is inserted. By attaching and tightening the washer 37 and the nut 38, both the cross beam connecting portions 52 and the horizontal beam 21 are fixed to each other. At this time, the column attachment portion 51 is pressure-bonded to the column 10 and the bracket 50 is fixed to the column 10. As a result, the column 10 and the crosspiece 21 are connected and fixed to each other via the bracket 50. 17 and 18 show the state at this time.
Process J: The construction jig 70 is removed from the bracket 50.

According to the construction method, in the process B and the process G, by attaching the construction jig 70 to the brackets 50 and 60 from the lateral direction with the contact part 71a on which the support part 71c is provided facing down, The support part 71c is arrange | positioned under the space between the both horizontal beam connection parts 52 and 62, and the horizontal beam 21 can be temporarily set | placed on the support part 71c.
Thereby, in the process D and the process I, the operation | work which fixes both the horizontal beam connection parts 52 and 62 and the horizontal beam 21 mutually can be performed by one worker. On the other hand, in the past, when one worker compressed both the cross beam connecting portions 52, 62 from both sides with both hands and narrowed the opening of the both cross beam connecting portions 52, 62, another worker Since it is necessary to insert the bolts 36 into the bolt insertion holes 52a and 21a of the both horizontal beam connecting portions 52 and 62 and the horizontal beam 21, the protective fence 1 is assembled unless at least two workers work. I couldn't. Therefore, construction efficiency can be improved compared with the past.

[Others]
In addition, this invention is not limited to the structure of the said embodiment.
For example, the order of step 2 and step 3 in the first embodiment can be switched. That is, after the end of the horizontal beam 21 is inserted between the both horizontal beam connecting portions 32 of the bracket 30 (step 3), the construction jig 40 is attached to the both horizontal beam connecting portions 32 of the bracket 30 and both horizontal beams are connected. It is also possible to prevent the connecting part 32 from opening (step 2) and to fix both the cross beam connecting part 32 and the horizontal beam 21 to each other in this state (step 4). Also by this construction method, by attaching the construction jig 40 to the both horizontal beam connecting portions 32 of the bracket 30, the both horizontal beam connecting portions 32 can be kept compressed from both sides, so that the bracket 30 is inclined. Thus, the vertical grid panel 20 can be temporarily placed between the support columns 10 in a stable state. Then, since both the cross beam connecting portions 32 of the bracket 30 are kept compressed from both sides, the work for fixing the both cross beam connecting portions 32 and the cross beam 21 to each other is performed by one worker. Can do.
In the second embodiment, when the shape of the bracket 50 and the bracket 60 can be combined (not shown), that is, when the brackets 50 and 60 can be fitted to each other, the process A starts. Step E can be omitted.

1 Guard fence 10 Post 10a Through hole (first engaging part)
20 Vertical lattice panel
30, 50, 60 Bracket 21 Horizontal beam 21a Bolt insertion hole 22 Vertical beam 31, 51, 61 Post attachment part 31a, 51a, 61a Missing part 31b, 51a Claw part (second engaging part)
32, 52, 62 Crosspiece connecting part 32a, 52a, 62a Bolt insertion hole 40, 70 Construction jig 41, 71 Jig body 41a, 71a Abutting part 41b, 71b Connecting part 71c Support part 72 Buffer

Claims (11)

It is a construction method of a protective fence in which a column and a panel are connected and fixed to each other by a bracket,
The panel has a pair of upper and lower horizontal rails and a plurality of vertical rails spanned between the horizontal rails,
The bracket is attached to the support so as to surround the outer periphery of the support, and a support mounting part having a missing part in a part thereof, and a pair of horizontal bars extending from both ends of the support mounting part and connecting the horizontal bars. A connecting portion;
Attaching the support mounting part of the bracket to the support;
A step of attaching a construction jig to both cross beam connecting portions to prevent the opening of both cross beam connecting portions; and
Inserting an end portion of the horizontal beam between both horizontal beam connecting portions of the bracket;
A step of connecting and fixing the both horizontal beam connecting portions and the horizontal beam to each other by a fastener;
The construction method of the protection fence characterized by having.   The construction method for a protective fence according to claim 1, wherein the opening of each horizontal beam connecting portion is pressed from the left and right directions of each horizontal beam connecting portion by the construction jig.   The method for constructing a guard fence according to claim 1, wherein the horizontal jig connecting portion is pressed down from the vertical direction of each horizontal beam connecting portion by the construction jig.   The method for constructing a protective fence according to claim 3, wherein the horizontal rail is supported by a portion of the construction jig that presses the horizontal rail connecting portion from below. The column is provided with a first engaging portion for positioning and temporarily fixing the bracket,
A second engagement portion that engages with the first engagement portion is provided on the support mounting portion of the bracket,
5. The method according to claim 1, further comprising a step of temporarily engaging the bracket with the support column by engaging the first engagement portion and the second engagement portion with each other. The construction method of the protection fence as described in one paragraph. The first engaging portion is a recess or a through hole formed in a side portion of the support column,
The said 2nd engaging part is a claw part formed in the said support | pillar attaching part so that it may engage with the said recessed part or the said through-hole, The construction method of the guard fence of Claim 5 characterized by the above-mentioned.   When the bracket is in a natural state, the bracket is opened so that the interval between the horizontal beam connecting portions is enlarged. When the bracket is pressed by the construction jig, the extending directions of the horizontal beam connecting portions are substantially parallel to each other. The construction method of the guard fence of Claim 2 characterized by these. A construction jig used in the construction method of the protective fence according to claim 2,
A jig having a pair of abutting portions that prevent the opening of both horizontal beam connecting portions by causing the opening of each horizontal beam connecting portion to abut against the side surface of each horizontal beam connecting portion, and a connecting portion that connects the both abutting portions The body,
A shock absorber interposed between the jig body and the bracket;
A construction jig characterized by comprising: A construction jig used in the construction method of the protective fence according to claim 3,
A pair of abutment portions that abut the opening of each horizontal beam connecting portion to the upper and lower ends of each horizontal beam connecting portion, a connecting portion that connects both the abutting portions, and one of the abutting portions, A jig body having a support portion for supporting an end portion of the horizontal beam inserted between both horizontal beam connecting portions,
A shock absorber interposed between the jig body and the bracket;
A construction jig characterized by comprising:   The construction jig according to claim 8 or 9, wherein the buffer body extends outside the periphery of the jig body.   The construction jig according to any one of claims 8 to 10, wherein the buffer body is formed of an elastic material.

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