JP2009127317A - Bridge construction apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bridge construction apparatus which dispenses with excessive facilities when taking countermeasures against windstorm, sufficiently ensures safety and workability in case of an unexpected wind gust, and dispenses with further temporary construction materials for preventing overturning thereof, to thereby avoid poor economy due to elimination of increase of working costs. <P>SOLUTION: The bridge construction apparatus is extended in a longitudinal direction of a bridge to be constructed, and set between piers to construct the bridge. The bridge construction apparatus is formed of an erection girder formed like a truss, support mounts supporting the erection girder, and a bridge segment lifting and moving device arranged under the erection girder. The erection girder formed like a portal shape in cross section is constructed of an upper truss wall, side truss walls hanging from both sides of the upper truss wall, and a pair of reinforcing pieces. Further the lifting and moving device is mounted on an internal surface of the upper truss wall in a longitudinally movable manner, and a bridge segment lifted by the lifting and moving device can be lifted and stored in an internal space of the erection girder. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a bridge erection device used in a bridge erection method such as a balanced cantilever method.

As a construction method generally used for the bridge erection method, for example, a span-by-span method or a balanced cantilever method is known.
Here, the span-by-span method is an index of the method of constructing one span at a time, while the balanced cantilever method is used to construct a bridge by extending each segment from the pier symmetrically. This is an index of the construction method.

  And as construction equipment used, what is called an erection nose and a large erection girder are generally known. The selection of these erection equipment is determined by the construction conditions such as the precast segment loading method.

In general, a large erection girder is used in the case of large-scale construction between multiple diameters.
In the case of the erection nose method, the applicable span is not particularly limited, and a span exceeding 100 m can be used, but in the case of a large erection girder method, about 80 m is considered reasonable.
Thus, the balanced cantilever method as in the present invention is a method that is used for construction of a relatively long span, and the traveling path of a so-called suspension moving device is generally one main structure, for example, a box-shaped facility. It is done.
In addition, a truss shape is often used as a facility for spans exceeding 60 m.

When formed in the truss shape, when the supply of the bridge segment is performed from below, the set position of the suspension moving device can be relatively low, and thus there is relatively little problem in stability, When transporting the so-called superstructure and supplying the bridge segment etc., the bridge segment etc. must pass through the truss shape lower surface side of the large erection girder that constitutes the moving girder of the suspension moving device There has been a problem that the set position has to be made quite high (see FIGS. 6, 7, and 8).

Specifically, for example, the height of the segment of the superstructure is about 4 m, the transportation equipment is about 2 m, the height of the lifting device is about 3 m, the winding operation margin when operating the lifting device is about 1 m, etc. As a result, a total height of about 10 m is required, and if the height of the transgarter is required to be about 6 m, the maximum total height will be about 16 m (in FIG. Indicates the maximum total height).

In normal times when there is relatively little wind, there is not much problem, but in the case of a storm with so-called strong winds, the size of the erection girder used in the method of the present invention and the height of the device, in other words, Due to the height of the center of gravity, there was a problem that the falling moment would be great.
In particular, the wind load in the case of sea and valleys may exceed about 300 kg / m ² depending on the case, and excessive facilities are required for measures against storms.

As countermeasures against typhoons, weather information can be checked in advance and approximate countermeasures can be taken.However, when a gust of wind that is difficult to predict occurs, the equipment moves unnecessarily, causing problems in safety and workability. It was happening.
In addition, the installation of anchors for that purpose is overworked, and it may have a major impact on the already completed superstructure, and additional temporary materials are required to prevent falling. In addition, the work cost has increased and there has been a problem of being uneconomical.

Japanese Laid-Open Patent Publication No. 8-3936

Thus, the present invention was devised in order to solve the above-described conventional problems, and does not require excessive facilities as a countermeasure against a storm, even in a storm where a so-called strong wind flies, rather than a normal time in which a relatively wind does not blow. Even if a gust of wind that is difficult to predict occurs, the equipment does not move unnecessarily, so safety and workability can be maintained sufficiently, and it is not necessary to take all possible measures against storms. Providing a bridge erection device that is not necessary, does not damage the already completed superstructure, and does not require additional temporary materials to prevent falling, and does not increase work costs. It is for the purpose.

The bridge erection device according to the present invention is:
It is a bridge erection device that extends in the longitudinal direction of the bridge to be constructed and is installed between the piers to construct the bridge.
The bridge erection device includes a truss-like girder that extends in the longitudinal direction of a bridge to be constructed, a support base that supports the girder with a predetermined height on a pier, and the erection A suspension moving device for a bridge segment, which is provided below the girder and travels in the longitudinal direction of the bridge,
The erection girder is formed in a gate shape with the cross-sectional shape of the upper truss wall and the side truss walls on both sides hanging from both sides of the upper truss wall, and the upper truss from the lower side of the side truss walls on both sides. A pair of reinforcing pieces connected to the inner surface side of the wall is provided and formed,
From the inner surface of the upper truss wall between the pair of reinforcing pieces, the suspension moving device is attached so as to be movable in the longitudinal direction, and the bridge segment lifted by the suspension moving device can be lifted and stored between the inside of the installation beam,
It is characterized by this.

If it is a bridge construction device according to the present invention,
Even during storms with so-called strong winds, rather than normal times when there is relatively little wind, there is no need for excessive equipment as a countermeasure against storms, and even if unpredictable gusts occur, the equipment does not move unnecessarily. In addition, safety and workability can be sufficiently maintained, and it is not necessary to take all possible measures against storms, so there is no need to install an excessive anchor, and there is no damage to the already completed superstructure. There is no need for a temporary material for preventing overturning, and the work cost is not increased.

Hereinafter, the present invention will be described based on the best mode for carrying out the invention shown in the drawings.
A bridge erection device 1 according to the present invention is a bridge erection device 1 mainly used in the above-described bridge cantilever method.
That is, as can be understood from FIG. 1, the bridge erection device 1 extends in the longitudinal direction of the bridge 2 to be constructed, and is installed between the piers 3 and 3 laid in advance to construct the bridge 2. Is.

  The bridge erection device 1 includes a large and long erection girder (erection girder) 4 formed in a truss shape and extending in the longitudinal direction of the bridge 2 to be constructed, and the erection girder 4 connected to the pier. 3... Comprising a support base for supporting a predetermined height above and a bridge segment suspension moving device 5 which is provided below the erection beam and travels in the longitudinal direction of the bridge. Yes.

Considering the outer shape of the erection girder 4, first, the outer shape is formed in a substantially gate shape by the upper truss wall 6 and the side truss walls 7 and 7 on both sides hanging from both sides of the upper truss wall 6. Has been.
A pair of reinforcing pieces 8, 8 connected to the inner side of the upper truss wall 6 from the lower portions of the side truss walls 7, 7 on both sides are provided and formed.

Further, a traveling rail 9 for the suspension moving device 5 is laid in the longitudinal direction from an inner surface portion of the upper truss wall 6 sandwiched between the pair of reinforcing pieces 8, 8. 5 is suspended and attached to this traveling rail 9 so as to be movable.
The bridge segment 10 lifted by the suspension moving device 5 is formed so as to be able to be lifted and stored up to the space inside the erection beam 4.

That is, the main feature of the bridge erection device 1 according to the present invention is that the shape of the erection girder 4 conventionally formed in a triangular or box-shaped square truss shape is made into a substantially portal shape by removing the so-called lower wall, The space for taking in the bridge segment 10 is secured in the internal space of the bridge-type erection girder, thereby making it possible to lower the overall center of gravity position of the bridge erection device 1.
Moreover, the construction strength of the erection girder 5 is never inferior to that of the conventional apparatus due to the pair of reinforcing pieces 8 and 8.

Next, the usage state of the bridge erection device 1 will be described.
As understood from FIG. 1, the bridge segment 10 to be laid is conveyed to the upper surface (superstructure) of the existing bridge 2 located on the left side in FIG. 1. As described above, the supply of the bridge segment 10 cannot be performed from the lower side. This is because the lower part is in the sea, in the river, or in a valley, and supply is impossible.
Therefore, it must be supplied from the upper surface (superstructure) of the existing bridge 2.

As shown in FIG. 1 or FIG. 3, the bridge segment 10 lifted by the lifting and moving device 5 is rotated 90 degrees to change its direction and is lifted until it enters the lower space of the erected beam 4 formed in a substantially gate shape. .
From that state, the bridge erection method of the balanced cantilever method is used to project one bridge segment 10 from the pier 4 in a bilaterally symmetric manner to construct the bridge.

FIG. 3 is a view taken along the line AA in FIG. 1. As shown in FIG. 3, the bridge is installed on the existing bridge 2 laid on the pier 4 so as to be movable in the width direction of the bridge 2. A first support base 11 is provided.
The first support base 11 is configured to be movable in the width direction on the existing bridge 2, so that the bridge 2 to be laid may be curved instead of linear. It can be handled. That is, when laying bent at the left side, the erection girder 4 is installed close to the right side of the bridge 2 in the width direction.
In addition, a second support base 12 is placed on the top of the first support base 11, and the installation girder 4 of the present invention having a substantially gate shape is placed on the second support base 12. .

Here, as can be understood from FIG. 3, in the case of the erection girder 4 of the present invention, the bridge segment 10 can be pulled into the space below the erection girder 4 by the suspending movement device 5 and lifted. The height from the upper surface to the upper part of the erection girder 5 can be reduced.
As a result, the position of the center of gravity of the bridge erection device 1 itself can be lowered (the maximum total height is indicated by symbol h-2 in FIG. 1), and even if there is a gust of wind, there is no risk of falling. .

In addition, the height of the conventional support base 14, for example, about 10 m (indicated by symbol h-3 in FIG. 7) can be lowered to, for example, half of 5 m (indicated by symbol h-4 in FIG. 3). As a result, in terms of the numerical value, the stability was improved by 1.6 times, the influence on the superstructure could be reduced, and the economic efficiency could be improved.

In the bridge construction method of the balanced cantilever method, the bridge construction is performed by projecting one bridge segment 10 from the pier 4 in a symmetrical manner, and is a view taken along the line B-B in FIGS. 1 and 1. As can be understood from FIG. 5, a pair of working scaffolds 13, 13 formed in a rectangular frame shape attached to the erection girder 4 are provided at the left and right locations where the bridge is erected and extended.
Thus, the worker performs the work of laying the bridge segment 10 on the work scaffolds 13 and 13.

BRIEF DESCRIPTION OF THE DRAWINGS It is structure explanatory drawing (the 1) explaining schematic structure of the bridge construction apparatus by this invention. It is the structure explanatory drawing (the 2) explaining schematic structure of the bridge construction apparatus by this invention. It is an AA arrow line view of FIG. It is the structure explanatory drawing (the 3) explaining schematic structure of the bridge construction apparatus by this invention. It is a BB line arrow directional view of FIG. It is structure explanatory drawing (the 1) explaining schematic structure of the conventional bridge construction apparatus. It is composition explanatory drawing (the 2) explaining schematic structure of the conventional bridge construction apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bridge erection apparatus 2 Bridge 3 Bridge pier 4 Construction girder 5 Lifting movement apparatus 6 Upper truss wall 7 Side truss wall 8 Reinforcement piece 9 Rail 10 Bridge segment 11 1st support stand 12 2nd support stand 13 Working scaffold 14 Conventional Support stand

Claims (1)

It is a bridge erection device that extends in the longitudinal direction of the bridge to be constructed and is installed between the piers to construct the bridge.
The bridge erection device includes a truss-like girder that extends in the longitudinal direction of a bridge to be constructed, a support base that supports the girder with a predetermined height on a pier, and the erection A suspension moving device for a bridge segment which is provided below the girder and travels in the longitudinal direction of the bridge;
With
The erection girder is formed in a gate shape with the cross-sectional shape of the upper truss wall and the side truss walls on both sides hanging from both sides of the upper truss wall, and the upper truss from the lower side of the side truss walls on both sides. A pair of reinforcing pieces connected to the inner surface side of the wall is provided and formed,
From the inner surface of the upper truss wall between the pair of reinforcing pieces, the suspension moving device is attached so as to be movable in the longitudinal direction, and the bridge segment lifted by the suspension moving device can be lifted and stored between the inside of the erection beam,
A bridge erection device characterized by that.

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