JP2002161514A - Protection structure for painting face of girder member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a protective structure for a painting face of a girder member preventing such a problem that the painting face of a girder member is damaged when chains hung from a scaffold comes into contact with the painting face in the girder members and the painted face must be repaired after construction, when a hanging scaffold is temporarily installed in the lower part of a member such as the girder member of a bridge. SOLUTION: A synthetic resin made painting face protection member 4 provided with a joint 5 having a width corresponding to the thickness of a bracing 3 and a pair of parallel holding plates 11 detachably put between both faces of the bracing 3 through the joint 5 is fitted to the bracing 3 getting into contact with the chain 7 hung from the scaffold of the girder member 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is intended to prevent a suspended surface of a girder such as a bridge from being damaged when a suspended chain is brought into contact with the girder. The present invention relates to a protection structure for a painted surface.

[0002]

2. Description of the Related Art Conventionally, when constructing a bridge or the like, a girder material is erected on a pier, and the girder material is coated with a base coat such as a rust preventive agent several times, and then a middle coat and a top coat are applied thereon. Since the painting is applied, the painting operation is performed at a high place for a long time, and there is a problem that the work efficiency is poor as well as danger.

Therefore, in recent years, in order to improve work safety and efficiency, the girder material is previously painted on the ground before the girder material is erected on the pier, and the painted girder material is removed. A method of carrying it on a pier and erection is being carried out.

[0004] On the other hand, in the construction work of a bridge, from the time when the girder material is erected on the pier to the time when the construction is completely completed, the work below the girder material is performed in order to carry out the work of attaching the floor slabs and various auxiliary equipment. A suspended scaffold will be temporarily installed on the platform. It is configured by suspending support pipes and laying a scaffold plate on these support pipes.

[0005]

However, in order to improve the safety and efficiency of the work as described above, it is assumed that the girder is previously painted on the ground and the painted girder is erected on the pier. However, it is necessary to provide a hanging scaffold below the girder until the entire erection work is completed.This hanging scaffold is a scaffold that has one end of the chain protruding from the web side of the girder. Since it is supported by hanging on the hanging bracket,
The painted surface of the part of the scaffold hanging bracket that comes in contact with the chain is rubbed and damaged, and the middle part of the chain suspended from above contacts the lower flange edge of the girder material, and the painted surface of the lower flange Was hurt.

Incidentally, in order to repair the painted surface damaged by contact with the chain, the suspended scaffold must be disassembled with the completion of the erection work, and the chain must be removed from the scaffold suspension bracket. If you can not do it. However, once the scaffold has been removed, it is no longer possible to repair the painted surface. Therefore, in practice, when removing the scaffold, the worker leans out from the end of the scaffold that has not been removed and performs repair painting work, which poses a danger to the work, There was a problem that complete repair painting work could not be performed, and a problem that extra post-processing work was required at the completion of this work.

Conventionally, as a solution to such a problem, a protective material such as a vinyl tube cut out and spread, a vinyl sheet, a waste cloth, or an adhesive vinyl tape is sandwiched in a portion of the girder material which comes into contact with the chain, or an adhesive vinyl tape is used. Methods such as winding have been attempted. However, these methods have the problem that the protective material is deformed or damaged in a single use and cannot be used more than once.In addition, the protective material must be firmly attached to the contact point between the beam and the chain in advance. Since it cannot be mounted in a fixed state, there has been a problem that the contact state with the chain becomes unstable, the protective object comes off from the girder material, and damage to the painted surface cannot be properly prevented.

The method of winding the adhesive vinyl tape around the contact portion of the girder material with the chain has the advantage that the tape can be appropriately fixed to the contact portion, but it takes time and effort to peel off the tape when winding or removing. It has been pointed out that the adhesive remains on the painted surface or the painted surface is peeled off.

[0009]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the conventional structure for protecting the painted surface of a girder material,
By attaching a removable protective material to part of the painted girder, even if the girder and the chain contact each other,
The protective material accurately prevents damage to the painted surface in contact with the chain, and the protective material can be easily attached to and detached from the girder and reused multiple times, thus ensuring work safety and saving labor. An object of the present invention is to provide a structure for protecting a painted surface of a girder material that can be expected to reduce the construction cost associated with the construction.

The structure for protecting a painted surface of a girder according to the present invention is, as a specific means for this, a girder material which is formed by contacting a scaffold suspension chain with the girder material when a suspended scaffold is temporarily installed on a girder material such as a bridge. A connecting portion having a width corresponding to the thickness of the receiving portion, and a receiving portion for preventing damage to the painted surface, the receiving portion being in contact with the scaffold suspension chain of the girder material, A coating surface protection member made of a synthetic resin and having a pair of parallel holding plates detachably sandwiched between both surfaces of the portion is attached.

The receiving portion that comes into contact with the scaffold suspension chain of the girder material is a scaffold suspension bracket having a hole for passing the scaffold suspension chain protruding from the girder material, and the painted surface protection material is used to connect the connecting portion. It is preferable that a pair of parallel holding plates be fitted to the inner peripheral edge of the hole of the scaffold suspension fitting so as to sandwich the pair of parallel holding plates on both sides of the scaffold suspension fitting.

[0012] Further, the receiving portion that comes into contact with the scaffold suspension chain of the girder material is a scaffold suspension fitting having a hole through which the scaffold suspension chain protrudes from the girder material. The coating surface protection material to be fitted to the connecting portion has an arc surface along the inner peripheral edge of the hole of the scaffold hanging bracket, and the planar shape of the pair of parallel holding plates has the arc-shaped connecting portion as the inner peripheral edge. It is preferably a fan shape.

[0013] Further, the receiving portion that comes into contact with the scaffold suspension chain of the girder material is the edge of the flange protruding from the girder material, and the painted surface protection material fits the connection portion to the edge of the flange. Alternatively, the shape may be such that a pair of parallel holding plates is sandwiched between upper and lower surfaces of the flange.

It is to be noted that both ends of the connecting portion of the painted surface protective material are provided with slip preventing projections for preventing the chain from detaching to the outside of both ends of the connecting portion when the scaffold hanging chain swings. preferable.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a structure for protecting a painted surface of a girder according to the present invention.
FIG. 9 is a perspective view of an embodiment showing a structure of a girder member 1 laid on a pier (not shown) and a scaffold suspension chain 7 hung on the girder member 1, as shown in FIG. And girder material 1
The pipe 6 is suspended and supported by a chain 7 suspended from the slab, and the suspension scaffold 2 for construction is temporarily provided by the pipe 6, and the floor slab concrete 18 is cast on the girder 1.

The structure for protecting the painted surface of a girder according to the present invention comprises a girder 1
When the hanging scaffold 2 is temporarily installed, the scaffold hanging chain 7 is intended to prevent damage to the girder material painting surface due to contact with the girder material 1, and comes into contact with the scaffold hanging chain 7 of the girder material 1. A connecting portion 5 having a width corresponding to the thickness of the receiving portion 3 is provided on the coated receiving portion 3, and a pair of parallel members detachably sandwiched between both surfaces of the receiving portion 3 via the connecting portion 5. Holding plate 1
1 is basically constructed by attaching a synthetic resin-made painted surface protection member 4 provided with 1.

In the embodiment shown in FIG. 1, the receiving portion 3 which comes into contact with the scaffold suspension chain 7 of the girder 1 is provided with a hole 10 for passing the chain 7 protruding from an upper portion of the web 8 of the girder 1. And a scaffold hanging bracket 9 having As shown in FIGS. 2 to 5, the coating surface protection member 4 includes a connecting portion 5 having a width corresponding to the thickness of the receiving portion 3 and a pair of parallel members provided on both sides of the connecting portion 5. And the connecting portion 5 is connected to the scaffold suspending metal fitting 9.
Of the pair of holding plates 11
Can be sandwiched and arranged on both sides of the scaffold hanging bracket 9.

The painted surface protection material 4 is made of a tough and elastic synthetic resin such as urethane resin, and the connecting portion 5 has a thickness of the scaffold hanging metal fitting 9 as the receiving portion 3 inside thereof. Specifically, as shown in FIG. 2, a width H having a gap h having a dimension to be fitted to the thickness t of the inner peripheral edge of the hole 10.
And a circular arc surface having a length L along the inner peripheral edge of the hole 10 shown in FIG. 3. A pair of the holding plates 11 are provided in parallel on both sides of the connecting portion 5.

The length L of the arcuate surface of the connecting portion 5 shown in FIG. 3 corresponds to, for example, about one-fourth the length of the inner peripheral edge of the hole 10 of the scaffold hanging bracket. Connection part 5
It is preferable that the pair of parallel holding plates 11 provided on both sides are formed in a sector shape with the arc-shaped connecting portion 5 as an inner peripheral edge. When the shape of the holding plate 11 is fan-shaped as described above, the surface of the scaffold suspension metal fitting 9 can be widely protected even when the chain 7 suspended from the connection portion 5 swings largely in the front-rear direction. .

Further, as shown in FIG. 5, at both ends of the connecting portion 5 forming an arc surface, when the scaffold suspension chain 7 swings, the chain 7 is prevented from detaching to the outside of both ends of the connecting portion 5. It is preferable to provide such a protrusion 12 for preventing slippage.

FIG. 6 shows another embodiment. In this embodiment, the receiving portion 3 of the girder 1 that contacts the scaffold suspension chain 7 is provided with a flange 13 of the girder 1 such as a lower flange 13.
Of the coating surface protection material 4
Is fitted to the lower flange edge 13a of the girder 1 so that a pair of parallel holding plates 16 can be sandwiched and arranged on both upper and lower surfaces of the lower flange 13.

In this embodiment, as in the case of the above-described embodiment, the connection portion 15 of the painted surface protection material 4 has the thickness of the flange 13 as the receiving portion 3 inside thereof, specifically, As shown in FIG. 8, has a width H having a gap h of a size to be fitted to the thickness t of the flange 13, and a length L along the edge 13a.

The length L of the connecting portion 15 is specifically such that about 3 to 5 chains 7 are arranged, and when the chains 7 swing at both ends,
Displacement preventing protrusions 17 are provided to prevent the connection portions 15 from being detached to the outside of both ends. The shape of the pair of parallel holding plates 16 in this embodiment is not limited as long as the connection portion 15 that contacts the chain 7 can be maintained in a state of being sandwiched by the flange 13. There is no need to make the fan shape as in the above embodiment, and an appropriate shape can be selected.

In the embodiment of FIG. 1, the receiving portion 3 of the girder 1 that comes into contact with the scaffold suspension chain 7 is a scaffolding hanger 9 projecting above the web 8 of the girder 1. As shown in FIG.
When the connecting portion 5 is fitted to the inner peripheral edge of the hole 10 by passing the connecting member 5 from the zero to the other side, the two holding plates 11 are sandwiched between both surfaces of the metal fitting 9. In this state, the chain 7 is inserted into the hole 10. if,
Since the chain 7 comes into contact with the connection portion 5 of the painted surface protection member 4 and the two holding plates 11, damage to the painted surface due to the chain 7 rubbing the surface of the metal fitting 9 can be prevented.

In the embodiment shown in FIG. 6, the receiving portion 3 in contact with the scaffold suspension chain 7 of the girder 1 is the flange 13 of the girder 1, for example, the edge 13a of the lower flange. 4 fits the connecting portion 15 to the lower flange rim 13a of the beam member 1 so that the pair of parallel holding plates 1
6 can be sandwiched between the upper and lower surfaces of the flange 13 so that the chain 7 suspended from above can be connected to the connecting portion 15.
When the chain 7 comes into contact with the
The coating surface can be prevented from being damaged by rubbing 3a. In the drawing of this embodiment, the receiving portion 3 of the girder 1 to which the painted surface protection material 4 is attached is the lower flange edge 13a of the girder 1 but the receiving portion 3 is the edge of the upper flange. Is also good.

[0026]

As described above, the painted surface protection material 4 according to the present invention can be used to suspend the chain 7 on the scaffold suspension fitting 9 projecting from the web 8 when temporarily suspending the suspension scaffold. The fan-shaped protection member 4 shown in the embodiment of FIG. 1 is fitted into the hole 10 of the metal fitting, and at the same time, the suspended chain 7
When the lower part of the contact member comes into contact with the flange 13 of the girder 1 or the like, the protection member 4 shown in the embodiment of FIG. 4 is easy to mount, and in the mounted state, both sides of the plate of the mounting portion are sandwiched between the parallel holding plates 11 and 16, so that the conventional sheet such as a vinyl sheet or rag can be used. Compared with the method of sandwiching the protection object, the fixing can be securely performed without easily coming off, and the preparation work for protecting the painted surface before the connection of the chain 7 can be efficiently performed.

After the protection member 4 is once attached, the connection portion 5 and the holding plates 11 on both sides of the fan-shaped protection member 4 shown in the embodiment of FIG. In the protection member 4 indicated by the symbol, the connecting portion 15 comes into contact with the chain 7 and the painted surface of the metal fitting 9 and the flange edge 13a can be reliably protected. In addition, when the construction is completed, these protective members 4 can be easily removed from the metal fittings 9 and the flange rim 13a immediately after removing the chain 7 with the removal of the scaffold. In addition, it can be reused again, and can save labor of this kind of construction, shorten the construction period, and reduce labor cost.

[Brief description of the drawings]

FIG. 1 is a partial perspective view showing the configuration of a first embodiment of a girder coating surface protection structure according to the present invention.

FIG. 2 is a partial perspective view showing a configuration of a scaffold hanging bracket and a painted surface protection material in the protection structure of FIG. 1;

FIG. 3 is a side view of the configuration of FIG. 2;

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a plan view of a painted surface protection material according to the first embodiment.

FIG. 6 is a partial perspective view showing the configuration of a second embodiment of the girder coating surface protection structure according to the present invention.

FIG. 7 is a plan view of the painted surface protection material of FIG. 6;

FIG. 8 is a sectional view taken along line BB of FIG. 7;

FIG. 9 is a partial perspective view of a suspended scaffold configured using the girder material painted surface protection structure of the present invention.

[Explanation of symbols]

 1: Girder material 2: Suspended scaffold 3: Receiving part 4: Painted surface protection material 5: Connection part 6: Pipe 7: Chain 8: Girder material web 9: Scaffold suspension metal fitting 10: Hole 11: Holding plate 12: Stopper Projection 13: Flange 13a: Flange rim 15: Connection part 16: Holding plate 17: Projection for preventing slippage 18: Floor slab

Claims (5)

[Claims] 1. A protective structure for a painted surface for preventing damage to a painted surface of a girder material caused by a scaffold suspending chain coming into contact with a girder material when temporarily suspending a suspended scaffold on a girder material such as a bridge, A connecting portion having a width corresponding to the thickness of the receiving portion, and a pair of parallel portions detachably sandwiched on both surfaces of the receiving portion via the connecting portion at a receiving portion that comes into contact with the scaffold suspension chain of the girder material. A painted surface protection structure for a girder material to which a synthetic resin painted surface protection material provided with a holding plate is attached. 2. A scaffold suspending fitting having a hole for passing a scaffold suspending chain protruding from a girder material, wherein a receiving portion which contacts the scaffold suspending chain of the girder material is provided. 2. The painted surface protection structure for a girder material according to claim 1, wherein said pair of parallel holding plates are fitted on the inner peripheral edge of the hole of said scaffold suspension fitting so as to sandwich a pair of parallel holding plates on both sides of said scaffold suspension fitting. . 3. A scaffold suspending fitting having a hole for passing a scaffold suspending chain protruding from the girder material, wherein the receiving portion in contact with the scaffold suspending chain of the girder material is provided in the hole of the scaffold suspending fitting. The coated surface protection material to be fitted has a connecting portion having an arc surface along the inner peripheral edge of the hole of the scaffold suspension metal fitting, and a planar shape of a pair of parallel holding plates having the arc-shaped connecting portion as an inner peripheral edge. 3. The structure for protecting a painted surface of a girder material according to claim 2, wherein: 4. A receiving portion that contacts the scaffold suspension chain of the girder material is an edge of the flange protruding from the girder material, and the painted surface protection material fits the connection portion to the edge of the flange, 2. The structure for protecting a painted surface of a girder material according to claim 1, wherein the structure is such that a pair of parallel holding plates are sandwiched between upper and lower surfaces of a flange. 5. The painted surface protection structure according to claim 3, wherein the painted surface protective material has protrusions for preventing the suspension of the scaffolding chain at both ends of the connecting portion.