JP2018178588A - Bridge construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bridge construction method which makes it possible to easily install a wall balustrade in the overhang construction method.SOLUTION: A bridge construction method using an overhang construction method which installs a bridge girder 1 by joining and overhanging a girder block 2 repeatedly. A plurality of anchorage reinforcements 3 protruding upward from the upper surface is integrally provided at predetermined positions on both the sides in the width direction of the girder block 2 and also an insertion hole extending upward from the lower surface is provided to form a precast wall balustrade block 7; a ground cover 5 is provided on the side part of a plurality of girder block 2 sequentially from one side in the overhanging direction; the anchorage reinforcements 3 are inserted into the insertion holes from the one side in the overhanging direction with respect to the girder block 2 to which the ground cover 5 is provided, so as to fixedly install the wall balustrade block 7; and a plurality of wall balustrade blocks 7 is arranged in parallel in the bridge axial direction to construct a balustrade.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method of construction of a bridge, and more particularly to a method of construction of a bridge constructed by an overhang construction method.

  As a typical superstructure bridge girder construction method of bridge construction, there is an overhang construction method. In the overhang construction method, bridge girder precast segments such as box girder blocks are joined, and left and right alternately or simultaneously with 3 to 4 m bridge girder (girter floor slab while balancing from left to right using a mobile work vehicle or mobile installation girder) Repeat the operation to extend) to build a full-length bridge girder.

  Therefore, according to this overhang construction method, it is possible to easily build a bridge even on a valley, a strait, a large river, a road with a large traffic volume, etc. where scaffolding and support work can not be installed from the ground.

  On the other hand, when a wall column is provided on a bridge girder (girder floor slab) constructed conventionally by such an overhang construction method, a ground covering work truck, a bridge inspection car, etc. is used, and an overhang scaffolding with arms is installed. Then, place reinforcements in the entire wall column, formwork installation, and cast concrete. Then, the concrete is demolded when the desired strength is developed, and the surface of the concrete is repaired or waterproofed at the top end (see, for example, Patent Document 1).

Unexamined-Japanese-Patent No. 03-271407

  However, in the construction method of the above-mentioned bridge wall column of the bridge, after the completion of the overhang construction, the arm is attached and this is used as a foothold to construct the wall column. For this reason, attachment / removal work of the arm becomes a high place work and also requires a lot of time and labor, which is one factor causing deterioration of the construction.

  An object of this invention is to provide the construction method of the bridge which enables it to carry out more easily the construction of the wall height column in the overhang construction method in view of the said situation.

  In order to achieve the above object, the present invention provides the following means.

  The construction method of a bridge according to the present invention is a construction method of a bridge using an overhang construction method in which a girder block is connected and repeatedly extended to construct a bridge girder, wherein a predetermined position on both sides of the girder block in the width direction In addition, a plurality of fixing bars projecting upward from the upper surface are integrally provided, and fixing bar insertion holes extending upward from the lower surface are provided to form a precast wall box block, and from one side in the overhang direction While sequentially providing ground coverings on the side portions of a plurality of girder blocks, sequentially pass fixing belts through the fixing muscle insertion holes to the girder blocks provided with ground coverings sequentially from one side of the overhang direction. The wall blocks are fixedly installed, and a plurality of wall blocks are arranged in parallel in the bridge axial direction to construct a column.

  Further, in the method of constructing a bridge according to the present invention, it is preferable that the ground cover be provided so as to bury a cover of a fixing portion of PC steel for introducing tension after extending the girder block.

  In the method of construction of a bridge according to the present invention, it is possible to eliminate the need for a wooden scaffolding or the like for a multi-column construction as in the prior art, and it is possible to reduce labor and time for attaching / removing the scaffolding. In addition, it becomes possible to carry out construction without making a bridge surface work vehicle unnecessary.

  Furthermore, it becomes possible to carry out the overhang construction construction of the bridge body and the installation work of the balustrade at the same time.

  Therefore, according to the method of installing a bridge of the present invention, it is possible to significantly improve the workability and to shorten the construction period significantly.

It is a figure which shows the construction method of the bridge which concerns on one Embodiment of this invention. It is a figure which shows the construction method of the bridge which concerns on one Embodiment of this invention, (a) is a state which introduced tension into a box girder block, (b) is a ground cover, a state which provided drainage and (c) It is a figure which shows the state which installed the wall height column. It is a figure which shows the installation state of the scaffold in the construction method of the bridge which concerns on one Embodiment of this invention.

  Hereinafter, with reference to FIGS. 1 to 3, a method of constructing a bridge according to an embodiment of the present invention will be described. Here, in the present embodiment, an operation of sequentially joining bridge girder precast segments (girder blocks) such as box girder blocks and extending the bridge girder (girder floor slab) from the bridge pier to the left and right using a mobile work vehicle or a mobile installation girder Are repeated to erect a bridge girder, and a method of constructing a wall column on the bridge girder erected by this overhang construction method.

  First, the bridge according to the present embodiment includes a plurality of bridge piers erected on a ground such as a river, abutments disposed on both sides of the side piers, and a plurality of bridge piers, bridges and abutments adjacent to each other. It is configured with a bridge girder.

  Further, as shown in FIG. 1, the bridge girder 1 is constructed by extending and constructing a box girder block 2 (2a, 2b, 2c) made of concrete. The box girder block 2 (2a, 2b, 2c) is formed with an upper floor plate, a lower floor plate and a web.

  Then, in the construction method of the bridge of this embodiment, the overhang girder construction method is applied, and the box girder block 2 is constructed using the erection girder and the mobile work vehicle in the bridge axial direction on both sides of the bridge pier with the column head of the bridge pier as an intermediate support point. Join and introduce tension to the central part of the bridge girder to the box girder block 2 with PC steel material, and gradually extend it and construct.

  On the other hand, in the construction method of the bridge of the present embodiment, as shown in FIG. 1 and FIG. 2 (a), a plurality of projecting upwards from the upper surface at a predetermined position on the tip side of the overhanging portion of each box girder block 2 Fixing bars 3 are integrally provided.

  Then, for example, when one box girder block 2 is extended, the PC steel 4 is tensioned and tension is introduced to the extended box girder block 2 (2a).

  Next, as shown in FIG. 1 and FIG. 2 (b), a cover is installed in the fixing portion of the PC steel 4 and a ground cover 5 and a drainage 6 are constructed so as to embed the cover. At this time, a plurality of anchoring bars 3 protruding upward from the upper surface of the ground cover 5 are integrally provided.

  Next, as shown in FIG. 1 and FIG. 2 (c), the wall side block 7 of the pre-cast product formed in advance with a plurality of insertion holes 7a extending upward from the lower surface Set in place on top of 5. At this time, the wall balustrade block 7 is installed while inserting the fixing bars 3 protruding from the overhanging portions of the box girder block 2 and the ground cover 5 into the plurality of insertion holes 7a opened in the lower surface. Then, a grout material is filled in the insertion hole 7 a, and the wall balustrade block 7 is integrally coupled to the bridge girder 1 through the plurality of fixing bars 3.

  In addition, a height adjustment member 8 is interposed between the wall side block 7 and the tip end side of the overhang portion and the ground cover 5 so that the height of the wall side block 7 is adjusted to a predetermined height. It is also good.

  Furthermore, in the present embodiment, as shown in FIG. 3, the bridge girder 1 is extended in sequence, and the scaffold 9 that performs the work of introducing tension to one adjacent box girder block 2 a and the other box girder block 2 b On the other hand, by making the scaffolding 9 which performs construction work, such as ground covering 5 and drainage 6, the same scaffolding, the effective utilization of the scaffolding 9 and the efficiency improvement of work can be achieved.

  Therefore, in the method of constructing a bridge according to the present embodiment, it is possible to eliminate the need for a bracket footing or the like for high-field construction as in the prior art, and to reduce labor and time for attaching / removing the bracket scaffold. In addition, it becomes possible to carry out construction without making a bridge surface work vehicle unnecessary.

  Furthermore, in the construction method of the bridge of the present embodiment, it is possible to simultaneously perform the installation work of the bridge girder 1 and the installation of the column 7.

  Therefore, according to the construction method of the bridge of the present embodiment, the construction property can be greatly improved and the construction period can be significantly shortened.

  As mentioned above, although one Embodiment of the construction method of the bridge which concerns on this invention was described, this invention is not limited to said embodiment, It can change suitably in the range which does not deviate from the meaning.

1 bridge girder 2 box girder block (bridge girder precast segment / girder block)
3 Fixing bars 4 PC steels 5 Grounding 6 Draining 7 Wall block (High-field)
8 Height adjustment material 9 Scaffold

Claims (2)

In the construction method of the bridge using the overhang construction method of erecting the bridge girder, repeating the work of joining and expanding the girder block,
A plurality of fixing bars projecting upward from the upper surface are integrally provided at predetermined positions on both sides in the width direction of the girder block, and fixing bar insertion holes extending upward from the lower surface are provided to make a precast wall column block Form
The ground covering is provided on the side of a plurality of girder blocks sequentially from one side of the overhanging direction, and the fixing bars are inserted through the girder block provided with the ground covering sequentially from one side of the overhanging direction The bridge construction method is characterized in that a fixing bar is inserted into a hole to fix and install the wall balustrade block, and a plurality of wall balustrade blocks are arranged side by side in a bridge axial direction to construct a balustrade. In the construction method of a bridge according to claim 1,
The above-mentioned earth covering is provided so that a cover of a fixing part of PC steel material for introducing tension after extending the girder block may be provided.

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