JP2019120056A - Waterproof structure for suspended scaffolding - Google Patents

Abstract

To provide a waterproof structure for suspended scaffolding which prevents water leakage so that used water does not drop under the suspension scaffolding in a method of filling a chain around the suspension scaffolding when removing a composite girder bridge floor slab with flexible resin and using water on the suspension scaffolding such as with a water jet.SOLUTION: A waterproof structure for suspended scaffolding for preventing water from dropping under the suspension scaffolding along a chain that suspends the suspension scaffolding, comprises: a hollow tube surrounding the chain of a prescribed length along the suspending direction of each chain; a support plate for supporting the bottom of the hollow tube, provided side by side by sandwiching the chain or sandwiching a chain attachment part so that the chain is inserted; a sealing material provided to close a gap around the chain and between the chain and the support plate, or around the chain attachment part and between the chain attachment part and the support plate; a primer applied to an inner wall of the hollow tube; and a flexible resin filled inside the hollow tube applied with the primer.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a waterproof structure of a suspension scaffold, and in particular, in a method of filling a chain around a suspension scaffold at the time of removing a synthetic girder bridge floor with a flexible resin and using water on the suspension scaffold such as water jet The present invention relates to a waterproof structure of a suspended scaffolding for preventing water leakage so as not to fall under the scaffolding.

Road viaducts are used throughout Japan, including expressways developed using a large number of viaducts. Many of them have become obsolete after many years of use, and are in need of repair and replacement.
When replacing a bridge, there is also a method of constructing a new bridge adjacent to an existing bridge while securing traffic with the existing bridge, and switching is performed at the completed stage. Such a method is not realistic on continuous viaduct roads. Therefore, the existing bridge girder is left, and the method of replacing the floor slab is adopted.

  However, since the floor slab is a large heavy-weight structure, it is not easy to remove, and usually, a method of cutting to a transportable size and removing is performed. In addition, in the case of the composite girder bridge fixed so that the girder and the floor slab are integrated during construction, it is firmly fixed to the girder, and it takes time and effort to cut and remove the fixed part with the girder It is work.

  In such a composite girder bridge, the floor slab excluding the portion just above the conventional bridge girder is cut into blocks and removed, and the remaining portion just above the bridge girder is mechanically mechanically plucked to remove concrete, and then cut. There are various limitations such as the size of the floor slab to be used, the need to cut both sides of the bridge girder at least along the bridge girder, the long cut distance necessary for removing the floor slab, and the generation of noise due to suspension etc. There was a problem.

On the other hand, there is also proposed a technology for efficiently separating the fixed part of the floor slab and the bridge girder in consideration of reuse of the bridge girder.
In Patent Document 1, only concrete is removed from the upper surface of the floor slab by high-pressure water jet along the length direction of the steel main girder to form a cutting zone having a width narrower than the width of the steel girder, and cutting Exposed part of the rebar embedded in the upper surface of the steel girder and the concrete floor slab in the zone and cut off the steel girder and the concrete floor slab, cut the concrete floor slab into pieces of the desired size, and upward The method of removing the bridge deck to be pulled off and removed is described.

According to this removal method, since the fixed part with the bridge girder can be easily separated by removing the concrete by the water jet, there is no need to cut both sides of the bridge girder along the bridge girder, and the efficiency of the removal work Improvement is expected.
Wastewater treatment is one of the problems of concrete removal by water jet. Under the viaduct, it is often used in various forms, and dropping the drainage down should be avoided. For this reason, the water used for the water jet is prevented from being dropped using a water blocking plate or the like, and a measure is taken to collect it using a pump. By the way, the suspension scaffold which hung the scaffold by a chain is used for construction of a viaduct in many cases. Since the chain is attached to a bridge girder etc., drainage may fall down from the scaffolding along the chain. The chain is not simple in cross-sectional shape, and it is difficult to attach a water blocking plate or the like because the interlocking part is not fixed, and effective water leakage measures can not be performed.

Although the above description has been made with respect to water jets whose needs are expanding, other than water jets, for example, wet sand blasting for peeling paint, wet wire saws, road load, etc., as work using water required for suspension scaffolding There are cutters, etc., but all have problems similar to water jets in terms of preventing water leakage.
Therefore, even with a hanging scaffold using a chain, a waterproof structure is required to prevent the water from falling from the chain.

JP 2012-207388 A

  The present invention has been made in view of the problems in the waterproof structure of the conventional suspension scaffold described above, and the object of the present invention is to use a flexible resin around the chain of the suspension scaffold at the time of removing the synthetic girder bridge floor plate In a method of filling and using water on a suspended scaffold such as a water jet, the present invention is to provide a waterproof structure of the suspended scaffold that prevents water leakage so that used water does not fall under the suspended scaffold.

  The waterproof structure of the suspended scaffold according to the present invention made to achieve the above object is a waterproof structure of the suspended scaffold which prevents water from falling down the suspended scaffold along a chain that suspends the suspended scaffold, A hollow tube surrounding a chain having a predetermined length along the hanging direction of each chain, and the chain is provided side by side across the chain so as to insert the chain, or the chain is previously installed on the floor plate of a hanging scaffold And a support plate for supporting the bottom of the hollow tube, and a gap around the chain and between the chain and the support plate, or around the chain attachment, A filling material provided to close the gap between the chain attachment portion and the support plate, a primer applied to the inner wall of the hollow tube, and the inside of the hollow tube coated with the primer And having a flexible resins, a.

The primer is preferably a modified silicone resin, and the flexible resin is preferably a silicone resin.
The vicinity of the chain exposed through the support plate and between the back surface of the support plate or the back surface of the support plate and the waterproof layer installed on the support plate, or the vicinity of the chain attachment portion and the back surface of the support plate or the support plate and the support plate It is preferable to further have a water leak detection sensor provided between the waterproof layer installed in the

According to the waterproof structure of the suspension scaffold according to the present invention, the chain is surrounded by a hollow tube, and then a flexible resin such as liquid silicone resin is filled in the middle space and hardened, so a complicated chain shape However, it can cover the circumference of the chain without any gap, and the water transmitted through the chain can be stopped properly.
Further, according to the waterproof structure of the suspension scaffold according to the present invention, the vicinity of the chain exposed through the gap of the juxtaposed support plates and between the back surface of the support plate or the support plate and the waterproof layer installed on the support plate Or, because a leak detection sensor is provided in the vicinity of the chain attachment portion and between the back surface of the support plate or the support plate and the waterproof layer installed on the support plate, peeling may occur between the chain and the flexible resin Even if the water leaks out, the operation of using the water can be interrupted immediately to detect the water leakage, and the waterproof structure can be repaired to provide a waterproof structure that prevents water leakage properly.

FIG. 5 schematically shows a method of installing a waterproof structure of a hanging scaffold according to an embodiment of the present invention. FIG. 2 schematically shows a waterproof structure of a suspension scaffold according to an embodiment of the present invention. It is a flowchart for demonstrating the installation method of the waterproof structure of the suspension scaffold by embodiment of this invention. FIG. 5 schematically shows a waterproof structure of a suspension scaffold according to another embodiment of the present invention.

Next, a specific example of the embodiment for implementing the waterproof structure of the suspension scaffold according to the present invention will be described in detail with reference to the drawings.
FIG. 1 is a view schematically showing a method of installing a waterproof structure of a hanging scaffold according to an embodiment of the present invention, wherein four steps (a) to (d) are performed according to the installation steps of the hanging scaffold and the waterproof structure of the hanging scaffold. Indicates the stage.
1 (a) to 1 (d) are each a view seen from a cross-sectional direction orthogonal to the bridge axial direction of the bridge.

  The waterproof structure of the suspension scaffold according to the present invention is to prevent water from falling down the suspension scaffold along a chain that suspends the suspension scaffold, and has a structurally complicated air gap and a wind. Water resistance that effectively prevents water leakage from around the chain by covering the chain that is susceptible to repeated deformation with a flexible flexible resin due to rocking of the hanging scaffold due to movement of a person or movement of a person on the hanging scaffold. It is a structure.

  Referring to FIG. 1A, a chain 40 and a single pipe 60 are installed as an initial stage of installing a suspension scaffold on a bridge in which a floor slab 20 is installed on a steel bridge girder 10. In the embodiment, the chain 40 is attached to the flange of each of two parallel steel bridge beams 10 using a chain fixing jig 30. Further, a plurality of chains 40 are installed at predetermined intervals along the bridge axial direction of the steel bridge girder 10. With the chain 40 attached, a hollow tube 50 for forming a waterproof structure around the chain 40 is temporarily fixed to the top of the chain 40 with the chain 40 inserted.

  The hollow tubes 50 are made of resin such as vinyl chloride, and finally fixed to a hanging scaffold so as to surround the chains 40 of a predetermined length along the hanging direction of each chain 40, and serve as waterproofing. Although it has a role of holding a predetermined amount of flexible resin to be played, since the chain 40 can not be inserted after the suspension scaffold is installed, the chain 40 is temporarily fixed in a state of being inserted in advance. Temporary fixing may be performed by using a wire or a cord.

  The chain 40 is attached in a ring shape, and a single pipe 60 is installed along the bridge axis to be supported by the ring bottom, and a single pipe 61 is installed on the single pipe 60 at right angles to the single pipe 60. Ru. The single tubes 60 and 61 are the framework parts of the hanging scaffold and are formed of metal hollow tubes. The single pipe 60 and the single pipe 61 may be the same, or may have different diameters and lengths.

  Referring to FIG. 1B, a scaffolding plate 70 is provided on a single tube 61 so as to be orthogonal to the single tube 61 and along the bridge axial direction, and a support plate 80 is further installed on the scaffolding plate 70. In order to support the single pipe 60, the ring 40 is oriented in the direction of the bridge axis, so as shown in FIG. 1, when the scaffolding plate 70 is installed as shown in FIG. Will occur. Therefore, the support plate 80 is installed to close the gap.

  In the embodiment, a rectangular support plate 80 is laid so as to be orthogonal to the scaffold plate 70 and to fill between the adjacent chains 40 in the bridge axial direction. As a result, the ring-shaped chain 40 is sandwiched between two adjacent support plates 80 in the bridge axial direction, and is sandwiched by two adjacent scaffold plates 70 in the direction orthogonal to the bridge axis. That is, the ring-shaped chain 40 passes through the rectangular gap surrounded by the two adjacent support plates 80 and the two adjacent scaffold plates 70.

The rectangular gap is closed with a lining material in the next step as shown in FIG. 1C, but a recess is provided in a portion adjacent to the chain 40 of the support plate 80 to allow the chain 40 to fit in advance. The support plates 80 adjacent to each other with 40 interposed therebetween can be installed without any gap in portions where the chain 40 is not present.
Although not shown, a water leak detection sensor may be attached in case a water leak occurs around the chain 40 under the support plate 80.

  Referring to FIG. 1 (c), the space surrounded by the support plate 80 and the scaffold plate 70 is closed by the lining material 90, including the space around the chain 40 on the support plate 80. The lining material 90 is intended to keep the flexible resin filled around the chain 40 from leaking later, and in one embodiment, covers around the chain 40 with urethane foam and further covers the gum tape. It has a double structure attached to it. The material and configuration of the lining material 90 are not limited to this as long as the flexible resin does not leak.

  Referring to FIG. 1D, the temporarily fixed hollow tube 50 is lowered and installed on the support plate 80. At this time, an adhesive is applied to the bottom of the hollow tube 50 so that the flexible resin does not leak from the bottom of the hollow tube 50, or the bottom of the hollow tube 50 is sealed with gum tape or the like. When asphalt sheets are laid on the support plate 80 as a waterproof measure for the entire suspended scaffold, the asphalt sheets may be sandwiched between the support plate 80 and the bottom of the hollow tube 50.

Next, the waterproof structure inside the hollow tube 50 will be described with reference to FIG.
FIG. 2 is a schematic view of a waterproof structure of a suspension scaffold according to an embodiment of the present invention.
2 (a) and 2 (b) show the process of forming a waterproof structure, and FIG. 2 (c) shows the final form of the waterproof structure.

  Referring to FIG. 2A, the state after the hollow tube 50 is installed is shown in cross section in FIG. 1D, and the leak detection sensor 120 is installed around the chain 40 under the support plate 80. ing. There are various forms of the water leak detection sensor, but in the embodiment, the linear water leak detection sensor 120 is installed to be wound around the chain 40.

  FIG. 2 (b) shows a state in which the primer 100 is applied to the inner periphery of the hollow tube 50. The primer 100 plays a role of preventing generation of a gap due to curing and shrinkage of the flexible resin filled in the hollow tube 50, and in the embodiment, modified silicone is used. The primer 100 may be applied to the entire inner circumference of the hollow tube 50, or may be applied according to the height of the flexible resin to be filled as shown in FIG. 2 (b).

  After the application of the primer 100, before the primer 100 is cured, the flexible resin 110 is poured into the hollow tube 50 and cured together with the primer 100, whereby the waterproof structure shown in FIG. 2C is completed. The flexible resin 110 may be made of a material that fills a complicated space around the chain 40 and is in close contact with the chain 40 flexibly, and in the embodiment, a silicone resin is used.

  The flexible resin 110 is likely to cure and shrink during the curing process. For this reason, there is a possibility that peeling may occur as it hardens at the interface with the inner wall of the hollow tube 50. However, since the curing time of the primer 100 is longer than that of the flexible resin 110, the curing shrinkage of the flexible resin 110 is compensated, and the primer 100 is cured later so that peeling does not occur at the interface with the inner wall of the hollow tube 50. Therefore, by combining the primer 100 and the flexible resin 110, the inside of the hollow tube 50 can be closed without gaps including the periphery of the chain 40.

  In addition, since the hanging scaffold is suspended by the chain 40, it is swung by movement of the person or wind. For this reason, even if the periphery of the chain 40 is hardened with a hard resin, peeling is likely to occur at the interface between the chain 40 and the resin by the rocking of the chain 40, and peeling may progress to lead to water leakage by repeated rocking. . However, since the flexible resin 110 is flexibly deformed following the chain 40 even if the chain 40 swings, peeling of the interface can be prevented, and a good waterproof structure can be realized.

  Further, as shown in FIG. 2C, since the water leakage detection sensor 120 is provided around the chain 40 under the support plate 80, even if water leakage occurs, it is detected immediately, and as a result, The flexible resin 110 can be newly repaired, for example, by adding a new flexible resin 110 into the hollow tube 50.

FIG. 3 is a flow chart for explaining the installation method of the waterproof structure of the suspension scaffold according to the embodiment of the present invention.
Referring to FIG. 3, the chain 40 is attached to the steel bridge girder 10 in step S310. In the embodiment, the chain fixing jig 30 is attached to the flange portion of the steel bridge girder 10 so as to sandwich the flange portion, and the ring fixing chain 30 is attached to the chain fixing jig 30 so as to attach it. Not exclusively.

  A plurality of chains 40 are installed along the bridge axial direction at predetermined intervals corresponding to the length of the single pipe 60 so as to hold the single pipe 60 that is a part of the framework of the suspension scaffold. Also, the chain 40 is attached to at least two steel bridge beams 10 installed in parallel so that the single pipes 60 can be arranged in parallel.

  After attaching the plurality of chains 40, the hollow tubes 50 are temporarily fixed to each of the plurality of chains 40 in step S320, and then the single tube 60 is bridged between the chains 40 adjacent in the bridge axial direction. The single pipe 61 is installed on the single pipe 60 so as to be orthogonal to the single pipe 60. The single tube 60 is installed to pass through the ring-shaped chain 40, but the single tube 61 is fixed to the single tube 60 using a clamp jig or the like. In addition, the hollow tube 50 is temporarily fixed with a wire, a cord or the like in a form in which the chain 40 is inserted.

The scaffold plate 70 and the support plate 80 are placed on the assembled single tubes 60, 61 (step S330). The scaffolding board 70 is made perpendicular to the single pipe 61, ie, along the bridge axis direction, using a thick and strong board to support a worker working on a suspended scaffolding or a device used for work. It arranges on single pipe 61 side by side.
The support plate 80 is a plate used to close a gap between the scaffold plates 70 arranged side by side, in particular, between the adjacent scaffold plates 70 across the chain 40, and may be a veneer plate or the like.

  In the embodiment, the water leak detection sensor 120 is installed in the vicinity of the chain 40 penetrating downward from the support plate 80 after installing the scaffold plate 70 and the support plate 80 or after installing the support plate 80. The leak detection sensor 120 can detect the leaked water transmitted through the chain 40 with high sensitivity by attaching a linear form so as to wind it around the chain 40. The water leak detection sensor 120 may be further attached to the back surface of the support plate 80. In the case where a waterproof layer such as an asphalt sheet is provided on the support plate 80, the water leak detection sensor 120 may be attached between the waterproof layer and the support plate 80.

  In step S340, a lining material 90 is installed to close the gap around the chain 40 and between the chain 40 and the scaffold plate 70 and the support plate 80. The material of the lining material 90 may be any shape and shape as long as it does not leak between injection and curing of the flexible resin to be filled later. It is possible to easily fill the air gap of the surrounding complicated shape. The lining material 90 is set to be smaller than the inner diameter of the hollow tube 50.

  After installing the lining material 90, the hollow tube 50 temporarily fixed at step S350 is lowered and installed on the support plate 80. In order to prevent the flexible resin from leaking out from the gap between the bottom of the hollow tube 50 and the upper surface of the support plate 80, the bottom of the hollow tube 50 or its periphery is lined with an adhesive or gum tape.

  After applying the primer 100 to the inner wall of the hollow tube 50 in step S360, the flexible resin 110 is filled in the hollow tube 50 and cured in step S370. At this time, the hollow tube 50 is formed so that the flexible resin 110 completely covers the lining material 90 and has a predetermined thickness effective to prevent water leakage around the chain 40 on the lining material 90. And the injection amount of the flexible resin 110.

  After curing of the flexible resin 110, the adhesion with the chain 40 is maintained by the characteristics of the flexible resin 110, and therefore it is possible to stop the water leaking through the chain 40 from hanging down. Even when a large amount of treated water such as water jet is used, the treated water flowing down from the chain 40 is accumulated on the flexible resin 110 in the hollow tube 50 or overflows from the hollow tube 50, but the hollow It can be recovered by the waterproof structure and drainage means of a suspended scaffold such as a waterproof sheet usually performed around the tube 50.

  The waterproof structure around the hollow tube 50 may have various configurations, but in the embodiment, an asphalt sheet is used, and the asphalt sheet hollowed out with the outer dimensions of the hollow tube 50 is inserted through the hollow tube 50 Asphalt sheet installed around the hollow tube 50 with the asphalt sheet installed around the hollow tube 50 and wound around the hollow tube 50 so that the outer side wall of the hollow tube 50 also extends in a strip shape on the lower side. Then, heat is applied so as to weld with the strip-shaped asphalt sheet, and the hollow tube 50 is completely covered with the asphalt sheet. By covering the flat portion on the support plate without the hollow tube 50 with the asphalt sheet, a waterproof structure including the hollow tube 50 can be formed.

  As described above, by combining the conventional waterproof structure with the waterproof structure around the chain according to the present invention, which was difficult in the conventional method, it is possible to realize the waterproof structure of the suspension scaffold that effectively prevents water leakage.

  In the above, the waterproof structure of the suspension scaffold has been described using the single-tube suspension scaffold generally used as an example of the structure of the suspension scaffold, but in addition to the single-tube suspension scaffold, the suspension scaffold directly suspends the floor panel with a chain. There is also used a panel-type suspension scaffold that is assembled by joining together, or a deck-type suspension scaffold in which a deck-like scaffold that has been assembled on the ground in advance is lifted and installed with a plurality of chains. In either case, there is no change in the method of suspending the scaffold with a chain, and the waterproof structure around the chain has conventionally been a common problem. The waterproof structure of the suspension scaffold according to the present invention is also applicable to these suspension scaffolds.

FIG. 4 is a schematic view of a waterproof structure of a suspension scaffold according to another embodiment of the present invention, showing a waterproof structure around a chain in the case of a panel suspension scaffold.
Referring to FIG. 4, a floor board panel 75 is used instead of the single pipe 60 and the single pipe 61 and the scaffold board 70 of the waterproof structure of FIG. 2 (c). The floor panel 75 is suspended by two or four chains 40, and the floor panels are configured to be connected by joints. The floor panel 75 is provided in advance with a ring-shaped chain attachment portion 130 at a portion where the chain 40 is attached, and the hanging chain 40 suspends the floor plate panel 75 so that the lower end portion is attached to the chain attachment portion 130.

In the case of a panel type suspension scaffold, the support plates 80 are laid side by side so as to sandwich the chain attachment portion 130. Also in this case, by forming a recess in the support plate 80 such that the chain attachment portion 130 is accommodated, it is possible to spread the space other than the periphery of the chain attachment portion 130 without a gap. When the water leak detection sensor 120 is attached, it is installed in the vicinity of the chain attachment portion 130 and between the back surface of the support plate 40 or the support plate 40 and the waterproof layer installed on the support plate 40.
The lining material 90 is installed so as to close the space around the chain attachment portion 130 and between the chain attachment portion 130 and the support plate 80. At this time, the periphery of the lower end portion of the chain 40 may also be covered with the filling material 90 at the same time.
After the installation of the lining material 90, the hollow tube 50 is installed in the same manner as in the single-tube suspension scaffolding of FIG. 2, and the flexible resin 110 is filled in the hollow tube 50 and cured.

  The deck type suspension scaffold can also form a waterproof structure around the chain by applying the waterproof structure of FIG. 2 (c) or FIG. 4 depending on the attachment method of the chain 40.

  Although the embodiments of the present invention have been described in detail with reference to the drawings, the present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the technical scope of the present invention. It is possible.

10 steel bridge girder 20 floor plate 30 chain fixing jig 40 chain 50 hollow pipe 60, 61 single pipe 70 scaffolding board 75 floor board panel 80 support board 90 lining material 100 primer 110 flexible resin 120 leak detection sensor 130 chain attachment part

Claims (3)

A waterproof structure of a suspension scaffold that prevents water from falling below the suspension scaffold along a chain that suspends the suspension scaffold,
A hollow tube surrounding a chain of a predetermined length along the hanging direction of each chain;
It is installed side by side across the chain so that the chain can be inserted, or it is installed side by side across the chain attachment part which is previously installed on the floor plate of the hanging scaffold and which mounts the lower end of the chain. A supporting plate to support,
An air gap around the chain and between the chain and the support plate, or a lining material provided so as to close the air gap around the chain attachment and between the chain attachment and the support plate;
A primer applied to the inner wall of the hollow tube,
And a flexible resin filled inside the hollow tube coated with the primer.   The waterproof structure of the suspension scaffold according to claim 1, wherein the primer is a modified silicone resin, and the flexible resin is a silicone resin. The vicinity of the chain exposed through the support plate and between the back surface of the support plate or the back surface of the support plate and the waterproof layer installed on the support plate, or the vicinity of the chain attachment portion and the back surface of the support plate or the support plate and the support plate The waterproof structure of the suspension scaffold according to claim 1, further comprising a water leak detection sensor provided between the waterproof scaffold and the waterproof layer installed in the housing.

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