JPH08333887A - Construction of scaffolding beam - Google Patents

Abstract

PURPOSE: To facilitate installation and removal by a single worker. CONSTITUTION: A support metal fixture 4 is fixed with a bolt screwed into an insert 2 buried in the exterior of a main girder 1, and a hang bolt 7 is screwed from the underside into the support metal fixture 4 and a support washer 10 is fixed to the hang bolt 7. A scaffolding beam 11 is slid over the support washer 10 and inserted for installation into the bottom side of the main girder 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a scaffolding beam which serves as a scaffolding at a construction site such as a bridge girder.

[0002]

2. Description of the Related Art Conventionally, when scaffolding beams are constructed on a bridge girder, as shown in the schematic diagram of FIG. 7, main girders 1 and 1 constituting a bridge girder manufactured by a factory are constructed by a crane or the like. First, one of the workers hangs the rope 51 in the gap S between the main girders 1 in a state where a plurality of rows are provided at predetermined positions.
Another worker attaches the rope 51 to the L-shaped reinforcing bar 5 from the outside.
Using 2 etc., pull the rope 51 outward, tie the pulled rope 51 to the hanging bolt 54 of the scaffolding beam 53, and tie the rope 55 to the other end side of the scaffolding beam 53 as shown in FIG. As shown in FIG. 9, the two workers pull up the scaffolding beam 53 so as to abut on the bottom side of the outer main girder 1, and attach the support plate 56 to the upper end of the hanging bolt 54 as shown in FIG. The scaffolding beam 53 is fixed to the main girder 1 via the support plate 56 and the hanging bolts 54, and the worker rides on the scaffolding beam 53 projecting outward from the main girder 1 and the parapet part of the bridge girder. The construction work of In such a conventional construction method, a plurality of workers install the scaffolding beams by using ropes, etc., which requires a large number of man-hours, and the installation work of the scaffolding beams is extremely difficult. There is also a danger, and when the bridge girder is constructed on a road or railroad track, it is not possible to secure sufficient space for installing scaffolding beams below the main girder,
The conventional construction method has a problem in that it may be difficult to install the scaffold beams.

[0003]

The present invention has been devised in view of the above problems of the prior art, and does not provide a scaffolding beam construction method by which one worker can safely install the scaffolding beam. For the purpose of that, the gist is to suspend the hanging bolt on the insert buried in advance on the outer peripheral surface of the main girder, and to attach the receiving washer to the lower part of the hanging bolt,
The inner end side of the scaffolding beam is placed on the receiving washer, and the scaffolding beam is passed along the bottom surface of the main girder in a state where the hanging bolt is passed through a central groove formed along the longitudinal direction of the scaffolding beam. It is to push inward and install scaffolding beams on the main girder.

[0004]

[Operation] If the hanging bolt is screwed into the insert embedded in the main girder from below through the support metal fittings and the receiving washer is attached to the lower part of the hanging bolt, the inside of the scaffolding beam will be placed on the receiving washer. By placing the end side and pushing the scaffolding beam inward along the bottom surface of the main girder, the scaffolding beam can be easily installed on the main girder, and one worker can install the scaffolding beam, and also Even when removing the scaffolding beams,
It is possible to easily remove the scaffolding beam by pulling it out along the bottom surface of the main girder.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the mounting state of the scaffolding beams in the construction of placing the foundation part of the balustrade of the bridge girder in concrete, and FIG. 2 shows an enlarged view of the main parts in FIG. 1, and FIG. FIG. 2 is a side view of the arrow A in FIG. 1. In the figure, the main girders 1 and 1 made of concrete formed in a factory are transported to the site and installed in multiple rows by a crane or the like.
The corner notch 1a is inclined in the corner on the bottom side of the
Of the main girders 1, 1, 1, the outer surface of the outermost main girder 1 is provided with inserts 2, 2, 2 at predetermined intervals along the longitudinal direction. The fixing bolts 3 are screwed into the respective inserts 2 from the outside so that the fixing bolts 3 can be projected to the outside of the outer side surface of the main girder 1. As shown in the enlarged view of FIG. 2, the bolt 3 is screwed into the insert 2 so that the outer end portion of the bolt 3 projects outward, and the nut 3 is tightened from the outer side of the bolt 3 to fix the fixing bolt 3. The support fitting 4 can be fixedly mounted on the outer surface of the main girder 1 by the nut 5, and the support fitting 4 is formed in a substantially L shape as shown in a perspective view in FIG. , At the lower end of the vertical piece 4a that comes into contact with the outer surface of the main girder 1 horizontally outwardly A horizontal piece 4b is integrally formed so as to extend, and rib pieces 4c, 4c for reinforcement are integrally formed so as to project from the vertical piece 4a to the horizontal piece 4b on both side surfaces thereof. An upper rib piece 4d is formed so as to project also on the upper end of the vertical piece 4a, and a lower rib piece 4e is formed so as to project upward also on the tip side of the horizontal piece 4b. Horizontal piece 4b inside rib piece 4e
The welding nut 6 is fixedly secured in advance on the upper surface of the. The support fitting 4 may be formed by forming the vertical piece 4a and the horizontal piece 4b with an angle member and welding the rib pieces 4c, 4c to the angle member.

In this way, the nuts 5 are tightened and the support fittings 4 are fixed to the outer surface of the main girder 1 at predetermined intervals along the longitudinal direction as shown in FIG. On the other hand, the suspension bolt 7 can be vertically hung from the support fitting 4 by screwing the suspension bolt 7 into the welding nut 6 from the lower side. The suspension bolt 7 is made of the resin cone 8 or the rubber made from the lower side. By inserting a rubber cone, the resin cone 8 can be kept in contact with the lower surface of the horizontal piece 4b of the support fitting 4, and further, a block-shaped locking nut 9 can be screwed onto the hanging bolt 7 to bring it to an intermediate position. The receiving washer 10 can be attached to the lower portion of the hanging bolt 7 via a nut 12 in advance.

That is, the receiving washer 10 is, as shown in FIG.
The horizontal piece 10a is formed of a horizontal piece 10a and a rising piece 10b which rises at a right angle from one end side of the horizontal piece 10a. As shown in FIG. Then, the resin cone 8, the loosening prevention nut 9 and the receiving washer 10 are attached to the respective hanging bolts 7. In this state, a scaffolding beam 11 having a shape shown in a perspective view in FIG. 6 is placed on the receiving washer 10. That is, the scaffolding beam 11 shown in FIG.
a and 11a are arranged facing each other in parallel, and the connecting piece 1
1b and 11b are connected and integrated with each other, and a central groove M vertically penetrating along the longitudinal direction is formed between the channel members 11a and 11a. Further, on the upper surfaces of the respective channel members 11a, 11a on the inner end side, the tip engaging projections 11c, 11c are projected upward.
Are formed respectively. A protruding plate 11d extending outward from the lower surfaces of the channel members 11a, 11a is formed on the outer end side, and a rising pipe 11e is erected on the protruding plate 11d.
A hook-shaped hook groove 11f is formed on the upper end side of the rising pipe 11e. In addition, a pin hole 11g is formed vertically through the upper surface of the channel material 11a on one side.
A wire hole 11h for passing a wire is formed on its side. Note that the scaffolding beam 11 is not limited to the channel members 11a and 11a described above, and may be made of a light-weight material as long as the central groove M that vertically penetrates along the longitudinal direction is well formed.

The inner end side of the scaffolding beam 11 thus formed can be placed on the receiving washer 10 and the scaffolding beam 11 can be slid and pushed toward the bottom side of the main girder 1, and at this time, the tip engagement. By slightly inclining the tip engaging protrusion 11c side downward so that the protrusion 11c does not get caught, the protrusion beam 11c is easily slid on the receiving washer 10 to scaffold the beam 11.
Can be pushed into the bottom side of the main girder 1, and at this time, the suspension bolt 7 is fitted in the central groove M of the scaffolding beam 11. Attach the leading end engaging projection 11c of the scaffolding beam 11 to the main girder 1.
By engaging with the corner cutouts 1a of the scaffolding beam 11, the scaffolding beam 11 is brought into contact with the bottom side of the main girder 1 and is satisfactorily supported on the inner end side and the hanging bolt 7.
Will be applied to the main girder 1, and the scaffolding beam 11 can be stably attached to the main girder 1 by properly tightening the nut 12.
Can be fixed to the bottom of the.

In this way, the fixing bolt 3 can be screwed into the insert 2 previously embedded in the outer surface of the main girder 1, and the supporting metal fitting 4 can be fixedly mounted through the nut 5. The hanging bolt 7 is screwed from below to vertically hang the hanging bolt 7, and the locking nut 9 and the receiving washer 10 are attached to the hanging bolt 7, and the scaffolding beam 11 is placed on the upper surface of the receiving washer 10 to receive it. The scaffolding beam 11 can be easily installed on the main girder 1 by sliding on the washer 10 and pushing the scaffolding beam 11 to the bottom side of the main girder 1. The scaffolding beam 11 is structurally lighter in weight than conventional ones. Therefore, one worker can easily insert the scaffolding beam 11 in a sliding manner at the site and install the scaffolding beam 11 along the longitudinal direction of the main girder 1 as shown in FIG. Sly on the washer 10 Is not installed, the installed scaffold beam 1
If the scaffolding plate 13 is placed along the longitudinal direction on the scaffolding 1, the scaffolding beam 11 can be installed by one operator along the longitudinal direction one after another at the site, and the installation work is easy. , Will be safe again.

The scaffolding beam 11 installed in this way
Is the corner notch 1a of the main girder 1 at the tip engaging projection 11c.
And the hanging bolt 7 and the support fitting 4 on the outer surface side.
Since the scaffolding beam 11 is supported on the outer surface side of the main girder 1 at the same time that the load acting point becomes clear, the moment to the lower side of the part of the scaffolding beam 11 protruding outward than the conventional one is Since the number of the scaffolding beams 11 is smaller than that of the conventional scaffolding beam 11, the scaffolding beam 11 can be made smaller than that of the conventional scaffolding beam 11 and can be made lighter.

Before the outermost main girder 1 is installed at a predetermined position by a crane or the like, the scaffolding beam 11 can be attached in advance through the support fitting 4 and the suspension bolts 7,
A plurality of scaffolding beams 11 at predetermined intervals along the longitudinal direction of the main girder 1.
If the main girder 1 is installed at a predetermined position with the already installed, the construction work of the scaffolding beam 11 at a high place can be omitted, and the workability is further improved. It should be noted that the loosening prevention nut 9 can be fitted into the central groove M between the pair of channel members 11a, 11a forming the scaffolding beam 11 in the installed state to achieve the loosening prevention function of the suspension bolt 7. It is a thing. Also, the loosening prevention nut 9 can perform a shake preventing function when the scaffolding beam 11 is previously attached via the support fitting 4 and the suspension bolt 7 before the main girder 1 is installed at a predetermined position, and the tip engagement is performed. The protrusion 11c serves to prevent the scaffolding beam 11 from falling off in this case.

After installing the plurality of scaffolding beams 11 along the longitudinal direction of the main girder 1 in this manner, the plurality of scaffolding beams 11 are arranged.
A plurality of scaffolding plates 13 are placed on the scaffolding beam 11, and a handrail pipe 14 is fitted into the rising pipe 11e of the scaffolding beam 11 from above, and the handrail pipe 14 is erected in a state where the hook groove 11f prevents the handrail pipe 14 from coming off. Then, the horizontal pipes 15 and 15 can be attached to the handrail pipe 14 in the lateral direction. Further, the fall prevention plate 16 is erected on the inner side of the lower portion of the handrail pipe 14, and the inside of the fall prevention plate 16 is provided. The fall prevention plate 16 can be fixed by fitting the fixing metal fitting 17. The fixing metal fitting 17 can be fitted and fixed between the rising pipe 11e of the scaffolding beam 11 and the outer ends of the channel members 11a, 11a. It is possible.

In this state, as shown in FIGS. 1 and 2, the bottom plate 18 to which the inner stile 19 and the outer stile 20 are attached.
Is installed on the scaffolding beam 11 and the nut 12 is appropriately tightened, so that the bottom plate 18 can be easily fixed at a predetermined position by one person. At this time, the inner pier 19 is cut at the site so as to fit between the hanging bolts 7, 7,
The outer berth 2 is arranged as shown in FIG.
0 is formed continuously in the longitudinal direction, and the arrangement state of the inner crosspiece 19 is shown in FIG. 4 which is a sectional view taken along the line BB in FIG. After installing the bottom plate 18, the outer pier 20
A push plate 21 is disposed on the outside of the main plate 1, and the bottom end of the push plate 21 is brought out of the main girder 1 through the push plate 21 by bringing the outer end of the push plate 21 into contact with the insertion pin 22 inserted into the pin hole 11g. Fix it while pressing it to the side. In order to prevent the insertion pin 22 inserted in the pin hole 11g from coming off, the wire hole 11
The wire can be passed through the h and the wire can be connected to the insertion pin 22.

After fixing the bottom plate 18 in this way, a side form 24 is erected on the bottom plate 18 as shown in FIG. At this time, as shown in FIG. 2, a fastening bolt 23 is fixedly connected to the tip of the fixing bolt 3 projecting outward by welding or a coupler or the like. A fastening fitting 25 is fastened to the outside of the fastening bolt 23, and the side mold 24 is fixed by the fastening fitting 25. In addition, an inner side mold 26 is erected on the upper surface side of the main girder 1, and an upper mold frame 27 is disposed on the upper surface between the side mold 26 and the side mold 24, so that the tightening fitting 2
Tighten 5, 25 from the outside to fix them. In this state, concrete is cast between the side molds 24 and 26, and the cast concrete C is used to form the part that will be the basis of the balustrade of the bridge girder.

After the construction is completed, it is necessary to remove the plurality of scaffolding beams 11 at the site. In this case, the nut 12 is loosened and the outer end side of the scaffolding beam 11 is lifted slightly upward. As a result, the tip engaging protrusion 11c is disengaged from the corner notch 1a, and thus the scaffolding beam 11 can be pulled out and removed in this state, and one worker can successively remove the scaffolding beam 11 along the longitudinal direction. It can be removed. In this case, the hanging bolt 7
The welding tool 6 is also removed from the welding nut 6, but when the bridge girder is repaired later, the supporting metal fitting 4 remains in the state of being embedded in the cast concrete C. The hanging bolt 7 is screwed onto the welding nut 6 of 4 from below, the locking nut 9 and the receiving washer 10 are attached to the hanging bolt 7, the scaffolding beam 11 is placed on the receiving washer 10, and the scaffolding beam 11 is attached. The scaffolding beam 11 can be easily installed by sliding it into the bottom surface of the main girder 1 and pushing it in for repair work, and it can be reused. In the conventional method, the pavement surface W is formed on the plurality of main girders 1 and cannot be reused. However, the structure of this example can facilitate repair work. Becomes

In this example, since the scaffolding beam 11 is attached to the main girder 1 by inserting it from the side, it can be constructed if there is a small space below the main girder 1, and there is a space below. It is extremely effective for bridge girder construction on roads or railroad tracks that are difficult to secure. In addition, such a construction method of the scaffolding beam 11 can be applied not only to a bridge girder but also to a construction site such as a building. Also,
In this example, the fixing bolt 3 is screwed into the insert 2 embedded in the outer side surface of the main girder 1, the support fitting 4 is fixedly mounted via the nut 5, and the hanging bolt 7 is moved downward from the support fitting 4. Tighten the suspension bolts 7 by screwing them together, attach the locking nuts 9 and the receiving washers 10 to the hanging bolts 7, mount the scaffolding beam 11 on the upper surface of the receiving washer 10 and slide it on the receiving washer 10. Although the scaffolding beam 11 is pushed into the bottom side of the main girder 1 and the scaffolding beam 11 is installed on the main girder 1, the insert 2 is embedded in the bottom surface of the main girder 1 and the hanging bolt is directly attached to the insert 2. Screw 7 from below,
The hanging bolt 7 is attached to the lock nut 9 and the receiving washer 10.
It is also possible to attach the scaffolding beam 11 on the upper surface of the receiving washer 10 and slide it on the receiving washer 10 to push the scaffolding beam 11 to the bottom side of the main girder 1 even with such a configuration. The scaffolding beam 11 can be easily installed on the main girder 1.

[0017]

According to the scaffolding beam construction method of the present invention, a hanging bolt is hung on an insert previously embedded in the outer peripheral surface of the main girder, and a receiving washer is attached to a lower portion of the hanging bolt, and the receiving washer is also attached. Place the inner end side of the scaffolding beam on top, and push the scaffolding beam inward along the bottom surface of the main girder with the hanging bolts inserted in the central groove formed along the longitudinal direction of the scaffolding beam. Since it was decided to install scaffolding beams on the main girders, if hanging bolts are attached to the main girders, the scaffolding beams will be placed on the receiving washers and slid sideways into the bottom side of the main girder for easy construction. Therefore, one worker can easily construct scaffolding beams one after another, workability is improved, and work is safe. In addition, before installing the main girder at a predetermined position with a crane, etc., scaffolding beams can be attached in advance via suspension bolts, and a plurality of scaffolding beams have already been attached at predetermined intervals along the longitudinal direction of the main girder. If the main girder is installed at a predetermined position in this state, the work of constructing the scaffolding beam at a high place can be omitted, and the workability is further improved.

Also, since the method of inserting from the side,
Scaffolding beams can be easily constructed even when the space under the main girder is extremely narrow, and when the scaffolding beams are later removed, the scaffolding beams can be slid outwardly and easily removed, The workability of removing work is also greatly improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a state in which a scaffolding beam is installed on a main girder.

FIG. 2 is an enlarged view of a main part in FIG.

FIG. 3 is a view on arrow A in FIG.

4 is a cross-sectional configuration diagram taken along the line BB in FIG.

FIG. 5 is a perspective configuration diagram showing a state in which a suspension bolt and a receiving washer are attached to a support fitting.

FIG. 6 is a perspective configuration diagram of a scaffolding beam.

FIG. 7 is a schematic configuration diagram showing a conventional construction method.

FIG. 8 is a schematic configuration diagram showing a conventional construction method.

FIG. 9 is a schematic configuration diagram showing a conventional construction method.

FIG. 10 is a schematic configuration diagram showing a conventional construction method.

[Explanation of symbols]

 1 Main Girder 1a Corner Notch 2 Insert 3 Fixing Bolt 4 Supporting Metal 5 Nut 6 Welding Nut 7 Hanging Bolt 8 Resin Cone (Rubber Cone) 9 Locking Nut 10 Receiving Washer 11 Scaffolding Beam 11a Channel Material 11c Tip Engaging Projection Piece 11e Upper pipe 12 Nut 13 Scaffolding plate 14 Handrail pipe 16 Fall prevention plate 17 Fixing bracket 18 Bottom plate 19 Inner pier 20 Outer pier 21 Push plate 22 Insertion pin 23 Tightening bolt 24, 26 Side form 25 Clamping C Construction concrete

Claims (1)

[Claims] 1. A suspension bolt is vertically installed on an insert previously embedded in the outer peripheral surface of a main girder, a receiving washer is attached to a lower portion of the hanging bolt, and an inner end side of a scaffolding beam is placed on the receiving washer. Installing the scaffolding beam on the main girder by pushing the scaffolding beam inward along the bottom surface of the main girder in a state where the suspension bolt is passed through a central groove formed along the longitudinal direction of the scaffolding girder. The construction method of the characteristic scaffolding beam.