JP7437270B2 - Bridge construction method - Google Patents

Description

The present invention relates to a bridge construction method.

Patent Document 1 describes a method for constructing a pier in a mountainous area, etc., in which a guide material is extended from the existing span part of the pier, a pile at the rear of the pier is driven in the middle part of the guide material, and the guide material is It is described that by driving additional piles at the front of the pier at the front of the pier, a pier with three piles placed at the vertices of a triangle in a plane is constructed.

Japanese Patent Application Publication No. 2019-131978

In Patent Document 1, in order to provide a brace between adjacent piles, a work gondola is lowered into a planar triangular area surrounded by the piles. If the guide material remains in the area, it will interfere with the hoisting and unloading of the gondola, so in Patent Document 1, the guide material is suspended by a crane and is moved backward to evacuate the area in advance. However, this evacuation work was difficult and there were issues in terms of workability.

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 that can easily construct piers and the like.

The present invention for solving the above-mentioned problems includes a step (a) of attaching the guide material to the existing part of the bridge so as to extend the guide material having a root part and a detachable part in front of the existing part of the bridge ; Step (b) of driving the piles of the bridge pier at the middle and front portions of the guide material in the longitudinal direction using the guide material as a scaffold , and Step (c) of constructing the floor of the bridge from the existing portion onto the bridge pier. ), a bridge is constructed by repeating steps (b), and there are three or more piles in total, each pile is located at each vertex of a polygon in the plane, and each pile is driven in step (b). After performing this, remove the removable part located in the range surrounded by each of the piles in the guide material, and use the gondola located in the range after removing the removable part to connect the adjacent piles. This is a bridge construction method characterized by providing braces between the bridges.

In the present invention, a highly rigid planar polygonal pier is constructed by extending guide members from an existing part of the bridge and driving pier piles at the intermediate and front portions of the guide members. A brace is provided between adjacent piles, but in this case, instead of retreating the guide material as described above, by removing the part of the guide material located in the area surrounded by the piles, the guide material can be moved into the area surrounded by the piles. can be easily evacuated from the area to avoid interference with work being carried out in the area for brace installation. Thereby, bridges such as piers can be easily constructed.

After removing the detachable part from the guide material, the guide material is extracted from the existing part, and in the step (a), the detachable part is attached to the extracted guide material to reuse the guide material. This is desirable.
This makes it possible to reuse the guide material when constructing the next part of the bridge using the existing part constructed in the above process.

Further, in the present invention, by using gondolas placed in an area surrounded by piles and installing braces between the piles, the brace installation work can be performed easily and safely. Furthermore, since the guide material is evacuated from the above range before placing the gondola, it is possible to prevent interference between the guide material and the gondola when installing the brace.

ADVANTAGE OF THE INVENTION According to this invention, the bridge construction method which can easily construct a pier etc. can be provided.

A diagram showing a pier 1. A diagram showing a pier 1. A diagram showing a bridge construction method. A diagram showing a bridge construction method. A diagram showing a bridge construction method. A diagram showing a bridge construction method. A diagram showing a bridge construction method. A diagram showing a bridge construction method. A diagram showing a bridge construction method. A diagram showing a bridge construction method. A diagram showing a bridge construction method. A diagram showing a bridge construction method. A diagram showing a bridge construction method.

Hereinafter, preferred embodiments of the present invention will be described in detail based on the drawings.

(1. Pier 1)
1 and 2 are diagrams showing a pier 1 (bridge) constructed by a bridge construction method according to an embodiment of the present invention. FIG. 1 is a perspective view of the pier 1. FIG. 2(a) is a diagram of the pier 1 viewed from above, and FIG. 2(b) is a diagram of the pier 1 viewed from the side.

As shown in FIGS. 1 and 2, the pier 1 is composed of a plurality of span sections 10, only a part of which is shown in FIGS. Each span portion 10 of the pier 1 has a structure in which a main girder 5 is arranged on a pier 3 and a lining plate 7 is placed on the main girder 5. The main girder 5 and the lining plate 7 constitute the floor of the pier 1 in the present invention.

The pier 3 has a structure in which a brace 32 is attached between three piles 31 arranged at positions corresponding to the vertices of a triangle in a plane, and a temporary support girder is installed between the upper parts of the two piles 31 at the front. 34 is provided, and a V-shaped support girder 33 for supporting the floor (main girder 5 and lining plate 7) is provided between the tops of the two piles 31 and the rear one pile 31. bridged.

Further, a cross beam 35 is spanned between the V-shaped support girders 33, and a steel member 37 such as an H-shaped steel is placed on the pile head of the rear pile 31. The support girder 33 described above is placed on the steel material 37. In this embodiment, the above-mentioned 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 span over the cross beams 35 of the adjacent piers 3. In this 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 board 7 includes a lining board 7a arranged on both sides of the pier in the width direction, and a lining board 7b arranged in the center of the pier in the width direction.

(2. Bridge construction method)
Next, a bridge construction method according to an embodiment of the present invention will be described with reference to FIGS. 3 to 13. In each figure, (a) is a view of the pier 1 viewed from above, and (b) is a view of the pier 1 viewed from the side.

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

Here, the rear part of the guide girder 20 is inserted between the support girder 33 and the temporary support girder 34 of the bridge pier 3 at the tip of the existing span portion 10, and the rear part is temporarily fixed to the support girder 33 and the temporary support girder 34. A tightening tool such as Bulman (registered trademark) can be used for temporary fixation. The guide girder 20 is assembled on the ground in advance, lifted by a crane (not shown), and inserted while adjusting the angle. Note that "rear" refers to the existing span portion 10 side, and "front" refers to the opposite side.

The guide girder 20 is placed in front of two steel members 21 in the span direction (corresponding to the left and right directions in FIGS. 3(a) and (b)) arranged on both sides of the pier in the width direction, and also on both sides of the pier in the width direction. It has a configuration in which two steel members 23 are arranged in the span direction, and the root portion 23a of the steel member 23 is attached under the front portion of the steel member 21. The steel material 23 is divided into a root portion 23a and a removable portion 23b in front of the root portion 23a, and the removable portion 23b is detachably attached to the root portion 23a with bolts or the like.

A scaffold board 22 for work is provided between the steel materials 21. Further, a cross beam 24 in the pier width direction is provided in front of the steel material 21 and at a location corresponding to the root portion 23a of the steel material 23.

Next, as shown in FIG. 4, the piles 31 at the rear of the piers of the next span section of the existing span section 10 of the pier 1 are driven in the middle part of the guide girder 20 in the longitudinal direction. The pile 31 is positioned by the cross beam 24 of the guide girder 20 and inserted between the steel members 23 in front of the cross beam 24. Although a steel pipe pile is used as the pile 31, it is not limited to this.

Thereafter, the guide girder 20 is temporarily fixed to the pile 31 at a portion corresponding to the root portion 23a of the steel material 23 using the bracket 50 attached to the pile 31. Thereby, the guide girder 20 is supported at the intermediate portion.

In this embodiment, as shown in FIG. A book pile 31 is driven at the front part of the guide girder 20 in the longitudinal direction. Here, two cross beams 25 are provided in the front part of the pier in the width direction of the pier, and the piles 31 are positioned between the tips of the cross beams 25 and inserted between the tips. Scaffolding boards 26 for work are arranged between the crossbeams 25, and both ends of the crossbeams 25 are exposed from the scaffolding boards 26.

Thereafter, the pile caps of the three piles 31 are treated, the cross beams 25 and scaffolding boards 26 of the guide girder 20 are removed as shown in FIG. do.

Pile cap processing is performed to install the support girder 33, and after cutting the pile cap of the rear pile 31, a steel material 37 such as an H-shaped steel is installed at the top. The support girder 33 is a member made by abutting two steel members in a V-shape, and since the rear pile 31 is located at the apex of the V-shape, the steel member 37 mentioned above is a member of the support girder 33 placed on it. It is installed at the top of the rear pile 31 in order to widen the mounting range. The reason why the steel members 23 of the guide girder 20 are arranged one step below the steel members 21 is to expose the pile heads of the piles 31 from between the steel members 23 so that the pile heads can be easily processed.

On the other hand, after cutting the pile heads of the two front piles 31, a plate (not shown) is installed at the top. The scaffold board 26 described above is installed at a position lower than the pile caps of these piles 31 in order to facilitate pile cap processing (see FIG. 5).

Thereafter, as shown in FIG. 7, the scaffold board 27 between the detachable parts 23b of the steel material 23 located in the range surrounded by the three stakes 31 is removed.

Then, as shown in FIG. 8, a gondola 42 assembled in advance is placed in an area surrounded by three piles 31. Here, the hanging part 41 of the gondola 42 is installed and fixed on the support girder 33, and the gondola 42 is suspended from the hanging part 41 to the above range by the wire 43.

Then, as shown in FIG. 9, the braces 32 and the temporary support girders 34 are installed between the adjacent piles 31 using the gondolas 42. The gondola 42 is provided with an extension scaffold 44 that extends outward and is movable in order to attach the brace 32 and the like. Note that the installation of the brace 32 is not limited to the use of the gondola 42, and may be performed using other scaffolds.

Thereafter, as shown in FIG. 10, the gondola 42 and the like are removed and the cross beam 35 is installed on the support girder 33, so that the pier 3 of the next span section is constructed in front of the existing span section 10. The cross beam 35 is spanned between the V-shaped support beams 33.

Further, as shown in FIG. 11, four main girders 5 are installed, two on each side of the pier in the width direction. The main girder 5 is constructed from the crossbeam 35 of the pier 3 of the existing span section 10 to the newly installed crossbeam 35 described above.

Then, as shown in FIG. 12, the lining plates 7a are respectively installed between the two main girders 5 on both sides in the width direction of the pier, and the guide girder 20 is extracted forward from the gap between the lining plates 7a. The guide girder 20 is extracted from the existing span portion 10 while being angled forward and upward by a crane (not shown). In addition, before removing the guide girder 20, the temporary fixation of the bridge pier 3 of the existing span section 10 to the support girder 33 and the temporary support girder 34, and the temporary fixation to the pile 31 by the bracket 50 are released, and Remove girder 24 etc.

Thereafter, as shown in FIG. 13, the next span portion 10 of the pier 1 is constructed by installing the lining board 7b above the gap between the lining boards 7a and attaching a handrail or the like (not shown). The removed guide girder 20 is temporarily fixed by inserting the rear part between the support girder 33 and the temporary support girder 34 of the pier 3 of the next span section 10 after reattaching the detachable part 23b of the steel material 23. The next span section 10 can be reused as the existing span section 10 when constructing the next span section. The aforementioned scaffolding board 22 and cross beam 24 are reattached to the guide beam 20.

Thereafter, by repeating the steps shown in FIGS. 3 to 13, the pier 1 is extended and constructed. Although not shown in the drawings, temporary scaffolding (not shown) is provided at appropriate locations in each of the above-described steps as necessary.

As explained above, according to the present embodiment, the guide girder 20 is extended from the existing span portion 10 of the pier 1, and the piles 31 of the pier 3 are driven at the intermediate and front portions of the guide girder 20, thereby increasing the rigidity. A tall triangular bridge pier 3 is constructed. A brace 32 is provided between adjacent piles 31, but in this case, instead of retracting the guide girder 20 as described above, the brace 32 is placed in the area of the guide girder 20 surrounded by the piles 31 (the attachment and detachment of the steel material 23). By removing the portion 23b), the guide girder 20 can be easily evacuated from the area, and interference with work performed in the area for installing the brace 32 can be avoided. Thereby, the pier 1 can be easily constructed.

In particular, in this embodiment, by using the gondolas 42 arranged in the range surrounded by the piles 31 and installing the braces 32 between the piles 31, the work of installing the braces 32 can be performed easily and safely. As described above, since the guide girder 20 is evacuated from the above range before placing the gondola 42, interference between the guide girder 20 and the gondola 42 can be prevented when the brace 32 is installed.

Furthermore, in this embodiment, after the guide girder 20 is removed from the existing span section 10 of the pier 1, the detachable part 23b of the steel material 23 that was once removed is reattached, and the next span section 10 of the pier 1 constructed in the above process is installed. When constructing the next span section as the existing span section 10, the guide girder 20 can be reused.

However, the present invention is not limited to the above embodiments. For example, in this embodiment, a total of three piles 31 are arranged at positions corresponding to the vertices of a triangle in a plane, and as a result, a highly rigid bridge pier 3 can be obtained while minimizing the number of piles 31. The structure of No. 3 is not particularly limited as long as three or more stakes 31 are arranged at positions corresponding to the vertices of the polygon. For example, it is possible to construct a bridge pier 3 having a rectangular planar shape from four piles 31, and the orientation of the polygon can also be determined in various ways.

The guide girder 20 may be used in accordance with variations in the arrangement of the stakes 31, and its configuration is not particularly limited as long as the portion located within the range surrounded by the stakes 31 is removable.

Furthermore, the present invention is applicable not only to mountainous areas but also to the construction of piers 1 in various other locations. Furthermore, it can be applied not only to the pier 1 but also when constructing other bridges.

Although preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to such examples. It is clear that those skilled in the art can come up with various changes or modifications within the scope of the technical idea disclosed in this application, and these naturally fall within the technical scope of the present invention. Understood.

1: Pier 3: Pier 5: Main girder 7, 7a, 7b: Lining plate 10: Span section 20: Guide girder 21, 23, 37: Steel material 22, 26, 27: Scaffolding board 23a: Root part 23b: Detachable part 24, 25, 35: Cross beam 31: Pile 32: Brace 33: Support girder 34: Temporary support girder 42: Gondola 50: Bracket

Claims (2)

(a) attaching the guide material to the existing portion of the bridge so as to extend the guide material having a base portion and a removable portion in front of the existing portion;
a step (b) of driving pier piles at the middle and front portions of the guide material in the longitudinal direction using the guide material as a scaffold;
(c) constructing a bridge floor part from the existing part onto the bridge pier;
Build a bridge by repeating
There are three or more piles in total, and each pile is located at each vertex of a polygon in a plane,
After each pile is driven in the step (b), the removable part located in the range surrounded by each of the piles in the guide material is removed, and the removable part located in the range after removing the removable part is A method for constructing a bridge, characterized in that a gondola is used to provide a brace between the adjacent piles. After removing the removable part from the guide material, extracting the guide material from the existing part,
2. The bridge construction method according to claim 1, wherein in the step (a), the removed guide material is reused by attaching the removed attachment/detachment portion to the extracted guide material.

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