JP2022021555A - Bridge construction method and gondola structure - Google Patents

Abstract

To provide a bridge construction method capable of efficiently constructing piers.SOLUTION: A pier is constructed by repeating the steps of: placing piles for bridge piers in front of the existing span part of the pier at the positions of the vertices of the triangles on a plane; installing a suspending part 41 for suspending a gondola 42 on the bridge pier to arrange a brace between adjacent piles using the gondola 42 suspended from the suspending part 41 to the region surrounded by the piles; and installing a floor part of the bridge on the bridge pier from the existing span part. The suspending part 41 is provided with a base 410 and a lifting device 420 used for suspending the gondola 42. The base 410 is formed by connecting units 410a formed by dividing the base 410 on a plane, and each unit 410a is provided with the lifting device 420 and the gondola 42.SELECTED DRAWING: Figure 9

Description

The present invention relates to a bridge construction method and a gondola structure used therein.

In Patent Document 1, as a method of constructing a pier in a mountainous area or the like, a guide material is extended from the existing span portion of the pier, and a pile at the rear part of the pier is driven in the middle portion of the guide material, and the guide material is used. It is described that by further driving the piles in the front part of the pier at the front part of the pier, a pier made up of three piles arranged at the positions corresponding to the apex of the triangle in the plane is constructed.

Further, in Patent Document 1, in order to provide a brace between adjacent piles, a hanging portion is provided on the pier, and a gondola for construction is suspended from the hanging portion in a plane triangular range surrounded by piles. ..

Japanese Unexamined Patent Publication No. 2019-131978

Currently, there is a demand for further efficiency in the construction of piers and the like. In this respect, there is room for further improvement in the configuration of the suspended portion and the gondola described above, and there is a possibility that the efficiency of construction can be realized by this.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a bridge construction method or the like capable of efficiently constructing a pier or the like.

The first invention for solving the above-mentioned problems is a process of driving a pile of a pier at a position at each apex of a polygon in a plane in front of an existing part of a bridge, and suspending a gondola for construction. A step of installing a hanging portion for lowering on the bridge pier and providing a brace between the adjacent piles using a gondola suspended from the hanging portion in a range surrounded by the pile, and the existing installation. A bridge is constructed by repeating the process of erection of the floor of the bridge on the pier from the portion, and the hanging portion is a lifting device used for hanging and lowering the gondola and a pedestal on which the lifting device is arranged. The pedestal is formed by connecting units that are divided into the pedestals on a flat surface, and each unit is provided with the elevating device and the gondola.

In the present invention, a pile is driven in front of the existing portion of the bridge to construct a highly rigid planar polygonal pier. A brace is provided between adjacent piles. At that time, a hanging part with a pedestal and an elevating device is provided on the pier, and the gondola is hung from the hanging part to the area surrounded by the piles, and the gondola is used. The brace can be installed easily and safely. In particular, in the present invention, by unitizing the pedestal of the hanging portion, the formation of the pedestal becomes easy, and by assuming that each unit is equipped with an elevating device and a gondola, the unit or the pedestal connecting the units can be formed. Just by installing it on the pier, the lifting device and gondola can be set and the construction can be done efficiently. In addition, there are as many gondola units as there are units, and each can be raised and lowered independently of the corresponding lifting device, so there is a high degree of freedom in work, and by operating multiple gondola units at the same time, workability when installing a brace is improved. do.

The polygon is, for example, a triangle, and the unit is provided with a plane V-shaped beam at the top and bottom, and the three units are connected to each other by connecting the tips of the beams to form the pedestal having a plane triangle shape. Is desirable.
In this case, a highly rigid pier can be obtained while minimizing the number of piles. Further, since the unit has a V-shaped beam, it is possible to easily form a flat triangular pedestal that matches the shape of the pier by connecting the tips thereof.

It is desirable that the gondola moves up and down along the stake while traveling the traveling portion of the gondola along the stake.
As a result, the gondola can be stably moved up and down along the stake.

The second invention is a gondola structure including a gondola for construction work and a hanging portion for suspending the gondola, wherein the suspending portion includes an elevating device used for suspending the gondola and the above-mentioned. The pedestal is provided with a pedestal on which the elevating device is arranged, and the pedestal is formed by connecting units obtained by dividing the pedestal on a plane, and each unit is provided with the elevating device and the gondola.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a bridge construction method capable of efficiently constructing a pier or the like.

The figure which shows the pier 1. The figure which shows the pier 1. The figure which shows the bridge construction method. The figure which shows the bridge construction method. The figure which shows the bridge construction method. The figure which shows the bridge construction method. The figure which shows the bridge construction method. The figure which shows the bridge construction method. The figure which shows the hanging part 41. The figure which shows the unit 410a and the gantry 410. The figure explaining the hanging down of the gondola 42. The figure which shows the bridge construction method. The figure which shows the bridge construction method. The figure which shows the bridge construction method. The figure which shows the bridge construction method. The figure which shows the bridge construction method.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

(1. Pier 1)
FIGS. 1 and 2 are views showing a pier 1 (bridge) constructed by the bridge construction method according to the embodiment of the present invention. FIG. 1 is a perspective view of the pier 1. FIG. 2A is a view of the pier 1 from above, and FIG. 2B is a view of the pier 1 from the side.

As shown in FIGS. 1 and 2, the pier 1 is composed of a plurality of span portions 10, and some of them are shown in FIGS. 1 and 2. Each span portion 10 of the pier 1 has a configuration in which the main girder 5 is arranged on the pier 3 and the lining plate 7 is placed on the main girder 5. The main girder 5 and the lining plate 7 form the floor of the pier 1.

The pier 3 has a configuration in which a brace 32 is attached between three piles 31 arranged at positions corresponding to each apex of a triangle on a plane, and a temporary receiving girder is provided between the upper portions of the two front piles 31. 34 is provided, and a V-shaped receiving girder 33 for supporting the floor portion (main girder 5 and lining plate 7) is provided between the two piles 31 and the top of one pile 31 at the rear. It is stakeout.

Further, a cross girder 35 is bridged between the V-shaped receiving girders 33, and a steel material 37 such as H-shaped steel is arranged at the pile head of the rear pile 31. The receiving girder 33 is placed on the steel material 37. In the present embodiment, the above triangle is an equilateral triangle, and the pier 3 can resist external forces from each direction in a well-balanced manner.

The main girder 5 is provided so as to be bridged over the cross girder 35 of the adjacent piers 3. In the present embodiment, four main girders 5 are provided at intervals in the width direction of the pier 1 (corresponding to the vertical direction in FIG. 2A, hereinafter referred to as the pier width direction).

The lining plate 7 includes a lining plate 7a arranged on both sides in the pier width direction and a lining plate 7b arranged in the central portion in the pier width direction.

(2. Bridge construction method)
Next, the bridge construction method according to the embodiment of the present invention will be described with reference to FIGS. 3 to 16. In each of the views except FIGS. 9 to 11, (a) is a view of the pier 1 from above, and (b) is a view of the pier 1 from the side.

In the present embodiment, first, as shown in FIG. 3, the guide girder 20 is attached to the existing span portion 10 so as to extend the guide girder 20 (guide material) in front of the existing span portion 10 (existing portion) of the pier 1.

Here, the rear portion of the guide girder 20 is inserted between the receiving girder 33 and the temporary receiving girder 34 of the bridge pier 3 at the tip of the existing span portion 10, and the rear portion is temporarily fixed to the receiving girder 33 and the temporary receiving girder 34. A narrowing tool such as Bullman (registered trademark) can be used for temporary fixing. The guide girder 20 is grounded in advance, lifted by a crane (not shown), and inserted while adjusting the angle. The term "rear" refers to the side of the existing span portion 10, and the term "front" refers to the opposite side.

The guide girders 20 are arranged in front of the two steel materials 21 in the span direction (corresponding to the left-right directions of FIGS. 3A and 3B) arranged on both sides in the pier width direction, and also on both sides in the pier width direction. It has a configuration in which two steel materials 23 are provided in the arranged span direction, and the rear portion of the steel material 23 is attached below the front portion of the steel material 21.

A scaffolding plate 22 for work is provided between the steel materials 21. Further, a cross girder 24 in the width direction of the pier is provided in front of the steel material 21 and at a position corresponding to the rear portion of the steel material 23.

Next, as shown in FIG. 4, in front of the existing span portion 10 of the pier 1, the pile 31 at the rear of the pier of the next span portion is driven in the middle portion in the longitudinal direction of the guide girder 20. The pile 31 is positioned by the cross girder 24 of the guide girder 20 and inserted between the steel materials 23 in front of the cross girder 24. A steel pipe pile is used as the pile 31, but the pile 31 is not limited to this.

After that, the guide girder 20 is temporarily fixed to the pile 31 by the bracket 50 attached to the pile 31. As a result, the guide girder 20 is supported by the intermediate portion.

In the present embodiment, next, as shown in FIG. 5, a scaffolding plate 27 for work is provided between the steel materials 23 of the guide girder 20, and in front of the existing span portion 10 of the pier 1, the pier of the next span portion is provided. The two front piles 31 are driven at the front of the guide girder 20.

Here, two cross girders 25 in the width direction of the pier are provided at the front portion of the guide girder 20, and the pile 31 is positioned between the tips of the cross girders 25 and inserted between the tips. A scaffolding board 26 for work is arranged between the cross girders 25, but both ends of the cross girder 25 are exposed from the scaffolding board 26.

After that, the pile heads of the three piles 31 are processed, the cross girder 25 of the guide girder 20 and the scaffolding plate 26 are removed as shown in FIG. 6, and the receiving girder 33 described above is installed at the top of the three piles 31. do.

The pile head processing is performed for the installation of the receiving girder 33, and the rear pile 31 is provided with a steel material 37 such as H-shaped steel at the top of the pile 31 after the pile head is cut. Since the receiving girder 33 is a member in which two steel materials are butted in a V shape and the rear pile 31 is located at the apex of the V shape, the above steel material 37 is a receiving girder 33 placed on the receiving girder 33. It is installed at the top of the rear pile 31 in order to widen the mounting range. On the other hand, for the two front piles 31, a plate (not shown) is installed on the top of the two piles 31 after cutting the pile head.

After that, the temporary fixing of the guide girder 20 (temporary fixing of the bridge pier 3 of the existing span portion 10 to the receiving girder 33 and the temporary receiving girder 34, and temporary fixing to the pile 31 by the bracket 50) is temporarily released, and the scaffolding plate is temporarily released. 27 is temporarily removed, and as shown in FIG. 7, the guide girder 20 is moved backward and retracted from the range surrounded by the three piles 31 placed earlier.

After that, the rear portion of the guide girder 20 is temporarily fixed to the receiving girder 33 and the temporary receiving girder 34 of the bridge pier 3 of the existing span portion 10 again. For this temporary fixing, a narrowing tool such as Bullman (registered trademark) can be used as described above. The guide girder 20 is moved by suspending the guide girder 20 with a crane (not shown) and adjusting the angle.

After that, as shown in FIG. 8, the scaffolding plate 27 is re-installed between the steel materials 23 of the guide girder 20, the guide girder 20 is temporarily fixed to the pile 31 by the bracket 50 again, and the gondola 42 for construction is hung down. The hanging portion 41 for the purpose is installed on the receiving girder 33 of the pier of the next span portion.

FIG. 9A is a diagram showing the hanging portion 41. As shown in FIG. 9A, the hanging portion 41 includes a gantry 410 and an elevating device 420. The hanging portion 41 and the gondola 42 form the gondola structure of the present invention.

The gantry 410 is used for arranging the elevating device 420 and the like. The gantry 410 is formed by connecting a plurality of units 410a. Each unit 410a has a shape in which the gantry 410 is divided in a plane, and each unit 410a is provided with an elevating device 420 and a gondola 42.

The elevating device 420 is used for suspending and lowering the gondola 42. The elevating device 420 has a drum or the like around which a wire 43 for suspending the gondola 42 is wound, and the gondola 42 can be elevated or lowered by unwinding or winding the wire 43.

10 (a) is a view of the unit 410a constituting the gantry 410 from above, and FIGS. 10 (b) and 10 (c) show the units 410a in the directions indicated by arrows A and B in FIG. 10 (a), respectively. It is a figure seen from.

In the unit 410a, the beams 411 and 411 arranged in a plane V shape above and below the unit 410a are connected by a vertical column 412 provided at the apex of the V shape and a vertical column 413 provided in the middle of each side of the V shape. It is composed of.

Further, a diagonal member 414 is provided so as to connect the vertical column 412 and the upper beam 411. Further, above and below the unit 410a, small beams 415 are provided between the flat V-shaped beams 411, and diagonal members 417 are provided so as to connect the vertical columns 413 and the upper small beams 415.

FIG. 10 (d) is a view of the gantry 410 from above. In the present embodiment, three units 410a having the same shape are combined in a plane triangular shape so that the beam 411 is on each side of the triangle, and the adjacent units 410a are connected to each other by the tips of the upper and lower beams 411. As a result, a flat triangular pedestal 410 is formed. In the present embodiment, the above triangle is an equilateral triangle according to the plan shape of the pier, and the gantry 410 installs the vertical column 412 of each unit 410a on the pier of the next span portion according to the position of the pile 31. Will be done.

Each unit 410a is suspended integrally with the elevating device 420 and the gondola 42 by a crane (not shown) or the like, and is arranged on the pier. Depending on the crane capacity, the units 410a may be connected in advance to form a gantry 410 as shown in FIG. 9 (b), or may be suspended for each individual unit 410a as shown in FIG. 9 (c). Cranes may be suspended and the units 410a may be connected on the pier to form a gantry 410.

After the hanging portion 41 is provided on the pier of the next span portion in this way, the gondola 42 of each unit 410a is suspended from the hanging portion 41 to the range surrounded by the three piles 31 as shown in FIG. 11A. take down. Each of these three gondola 42 can be raised and lowered independently. Note that FIG. 11A omits the illustration of the guide girder 20.

FIG. 11B schematically shows the arrangement of the three gondola 42 in a plane. Each gondola 42 has a small triangular (regular triangular in this embodiment) plane and is suspended along each of the three piles 31.

The gondola 42 is arranged with one vertex of the triangular plane facing the stake 31. A guide roller 421 (running portion) is provided on the gondola 42 at a position corresponding to the apex. By running the guide roller 421 along the stake 31, the gondola 42 can be stably moved up and down along the stake 31. In addition, instead of the guide roller 421, another traveling portion that runs along the pile 31 may be provided, such as a slide metal fitting that comes into contact with the pile 31 and functions as a guide. Further, a guide rail in the vertical direction may be provided on the side surface of the pile 31, and the traveling portion may be traveled along the guide rail.

Using this gondola 42, a brace 32 and a temporary receiving girder 34 are installed between adjacent piles 31 as shown in FIG. The gondola 42 is also provided with an extension scaffold 44 extending outward so that the brace 32 and the like can be attached and retracted. Further, in the present embodiment, the work efficiency is improved by simultaneously operating three gondola 42s and installing the brace 32 and the like on both sides of the gondola 42 (see the arrow in FIG. 11B).

After that, as shown in FIG. 13, the hanging portion 41, the gondola 42, and the like are removed, and the cross girder 35 is installed on the receiving girder 33 to complete the pier 3 of the next span portion. The cross girder 35 is bridged between the V-shaped receiving girders 33.

Further, as shown in FIG. 14, four main girders 5 are installed on both sides in the width direction of the pier. The main girder 5 is erected from the cross girder 35 of the pier 3 of the existing span portion 10 to the cross girder 35 newly installed above.

Then, as shown in FIG. 15, the lining plate 7a is installed between the two main girders 5 on both sides in the width direction of the pier, and the guide girder 20 is pulled forward from the gap between the lining plates 7a. The guide girder 20 is pulled out from the existing span portion 10 while being angled diagonally forward and upward by a crane (not shown). The guide girder 20 is temporarily fixed (temporarily fixed to the receiving girder 33 and the temporary receiving girder 34 of the bridge pier 3 of the existing span portion 10 and temporarily fixed to the pile 31 by the bracket 50) before being pulled out, and the scaffolding is released. Remove the boards 22, 27, cross girders 24, etc.

After that, as shown in FIG. 16, the lining plate 7b is installed above the gap between the lining plates 7a, and a handrail or the like (not shown) is attached to construct the next span portion 10 of the pier 1. The extracted guide girder 20 is next to the existing span portion 10 by inserting the rear portion between the receiving girder 33 and the temporary receiving girder 34 of the bridge pier 3 of the next span portion 10 and temporarily fixing the next span portion 10. It can be used when constructing the span part of. The scaffolding plate 22 and the cross girder 24 are reattached to the guide girder 20.

Hereinafter, by repeating the steps of FIGS. 3 to 16, the pier 1 is extended and constructed. Although not shown, temporary scaffolding (not shown) is provided at an appropriate place as needed in each of the steps described above.

As described above, according to the present embodiment, the pile 31 is driven in front of the existing span portion 10 of the pier 1 to construct a highly rigid flat triangular pier 3. A brace 32 or the like is provided between the adjacent piles 31, and at that time, a hanging portion 41 having a gantry 410 and an elevating device 420 is provided on the pier 3 so as to be in a range surrounded by the piles 31 from the hanging portion 41. The gondola 42 can be hung down, and the brace 32 and the like can be easily and safely installed by using the gondola 42.

In particular, in the present embodiment, the gantry 410 of the hanging portion 41 is unitized to simplify the formation of the gantry 410, and each unit 410a is provided with the elevating device 420 and the gondola 42. The set of the elevating device 420 and the gondola 42 can be completed simply by installing the pedestal 410 to which the 410a or the unit 410a is connected on the pier 3, and the construction can be performed efficiently. As a result, it is possible to shift to gondola work in a short time, and work at heights is reduced, so safety is high.

In addition, there are as many gondola 42s as there are units 410a, and each can be raised and lowered independently of the corresponding elevating device 420, so the degree of freedom of work is high, and by operating multiple gondola 42s at the same time, when installing a brace. Workability is improved.

The pier 3 of the present embodiment has a planar triangular shape, and a highly rigid pier 3 can be obtained while minimizing the number of piles 31. By providing the V-shaped beam 411 at the top and bottom of the unit 410a, it is possible to easily form a flat triangular pedestal 410 that matches the shape of the pier 3 by connecting the tips thereof.

Further, the gondola 42 can move the traveling portion such as the guide roller 421 along the pile 31 in a stable and smooth manner along the pile 31.

However, the present invention is not limited to the above embodiments. For example, in the present embodiment, a total of three piles 31 are arranged at positions corresponding to the vertices of a triangle on a plane, whereby a highly rigid pier 3 can be obtained while minimizing the number of piles 31. The configuration of 3 is not particularly limited as long as three or more piles 31 are arranged at positions corresponding to the vertices of the polygon. For example, it is possible to construct a flat pier 3 from four piles 31, and the orientation of the polygon can be determined in various ways.

The gantry 410 and the units 410a constituting the gantry may be used according to the variation of the arrangement of the piles 31, and if each unit 410a is equipped with the elevating device 420 and the gondola 42, the shape and configuration thereof are particularly particular. Not limited.

Further, in the present embodiment, the guide girder 20 is moved backward and retracted from the range before the gondola 42 is suspended in the range surrounded by the piles 31, but the gondola 42 is surrounded by the three piles 31 in the state of FIG. A part of the guide girder 20 located in the range is configured to be detachable from the guide girder 20, and instead of moving the guide girder 20 backward and retracting from the range in the process of FIG. 7, the above part is removed. May be good.

Further, the present invention can be applied not only to the mountainous area but also to construct the pier 1 at various other positions. Further, it can be applied not only to the pier 1 but also to the construction of other bridges.

Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to these examples. It is clear that a person skilled in the art can come up with various modified or modified examples within the scope of the technical idea disclosed in the present application, and these also naturally belong to the technical scope of the present invention. Understood.

1: Pier 3: Pier 10: Span 20: Guide girder 31: Pile 32: Brace 41: Suspended part 42: Gondola 43: Wire 44: Extension scaffolding 311: Guide rail 410: Mount 410a: Unit 411: Beam 412, 413: Vertical columns 414, 417: Oblique members 415: Beams 420: Elevating device 421: Guide rollers

Claims (4)

In front of the existing part of the bridge, the process of placing piles of piers at the positions that are the vertices of polygons on the plane,
A hanging section for hanging the gondola for construction is installed on the pier, and a brace is placed between the adjacent piles using the gondola suspended from the hanging section to the area surrounded by the pile. The process of setting and
The process of erection of the floor of the bridge from the existing part on the pier,
Build a bridge by repeating
The hanging portion includes an elevating device used for suspending and lowering the gondola, and a pedestal on which the elevating device is arranged.
The bridge construction method, wherein the gantry is formed by connecting units obtained by dividing the gantry on a plane, and each unit includes the elevating device and the gondola. The polygon is a triangle
The unit is provided with flat V-shaped beams at the top and bottom.
The bridge construction method according to claim 1, wherein the pedestal having a planar triangular shape is formed by connecting the three units to each other at the tips of the beams. The bridge construction method according to claim 1 or 2, wherein the gondola moves a traveling portion of the gondola along the pile and raises and lowers the gondola along the pile. A gondola for construction and
The hanging part for hanging the gondola,
It is a gondola structure with
The hanging portion includes an elevating device used for suspending and lowering the gondola, and a pedestal on which the elevating device is arranged.
The gantry is formed by connecting units obtained by dividing the gantry on a flat surface, and each unit includes the elevating device and the gondola.

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