JP2004332425A - Bridge construction method and bridge building apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bridge construction method which concurrently carries out bridge girder partitive overhanging work and a bridge girder capital construction work on a next pier, extremely shortens a construction period necessary for construction of the entire bridge, and dispenses with employment of a shuttering device of a complicated and cumbersome structure with degraded workability, and to provide a bridge construction apparatus implementing the method. <P>SOLUTION: According to the bridge construction method and the bridge construction apparatus implementing the method, the following first and second steps are concurrently carried out. Specifically in the first step, a movable erection girder is erected across the erected piers, and the bridge girder is equally overhung from both ends of the bridge girder capital formed on one of the piers beforehand by a pair of bridge girder forming shuttering devices hung from the movable erection girder in a manner movable along a longitudinal direction of the same, to thereby carry out partitive construction of the bridge girder. In the second step, a new bridge girder capital is formed on the pier adjacent to the one pier by a bridge girder capital forming shuttering device. In this manner, the bridge girder is constructed across the piers. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a bridge construction apparatus that divides a bridge girder made of prestressed concrete or the like between erected piers to project overhang.
[Prior art]
2. Description of the Related Art Conventionally, as a method of extending a bridge girder made of, for example, prestressed concrete using a so-called movable erection girder, a construction method called a so-called P & Z construction method is generally known.
[0002]
In this P & Z method, a movable erection girder having a length, for example, about 15 to 20 m longer than a span to be erected is used between predetermined erected piers.
[0003]
A pair of bridge girder forming form devices are suspended from the movable erection girder so as to be movable in the longitudinal direction.
[0004]
In the operation using the movable erection girder, three gantry for supporting the movable erection girder on an upper part of a pier or the like, and a tip support column used for movement are also used.
[0005]
Here, in the P & Z method, a pair of bridge girder forming form devices suspended from the movable erection girder are arranged on both sides of the pier, and the bridge girder is adjusted while maintaining an exquisite balance using the so-called palletization principle. Is performed to construct the split overhang.
[0006]
By using the P & Z method, it is possible to relatively easily construct a so-called large-span PC bridge.
[0007]
However, when performing the split overhang construction of the bridge girder, it is first necessary to construct the bridge girder column head on the upper side of the pier.
[0008]
This is because, after this bridge girder column head is constructed, a pair of pier forming form devices are arranged on both sides thereof with the bridge girder column head as a base axis, and the split girder construction of the bridge girder is performed. .
[0009]
The details of the P & Z method are described in JP-B-59-47762.
[0010]
[Patent Document 1]
JP-B-59-47762 [Problems to be solved by the invention]
However, considering the case of using a so-called P & Z apparatus by the conventional P & Z method, the conventional P & Z apparatus uses a bridge girder forming apparatus on a so-called front side (a front end side on which a bridge girder is to be built). The construction of the column caps is performed, but the division and overhang construction work of the bridge girder must always be given priority from the process sequence of the P & Z method.
[0011]
That is, conventionally, a pair of bridge girder forming form devices are arranged on both sides of the bridge pier on which the bridge girder column head is constructed, and the bridge girder is divided and overhanged by the pair of bridge girder forming form devices, and always after the work, The bridge girder column head was constructed using the bridge girder forming form device on the front side (the front end side where the bridge girder should be constructed).
[0012]
As described above, in the past, the work of constructing the split girder of the bridge girder and the work of constructing the bridge girder column head at the next pier could not be performed at the same time, and as a result, the construction period of the entire bridge had to be prolonged. There was a problem that the cost for the minute work was increased.
[0013]
In addition, since the bridge girder column head is constructed with the bridge girder forming form device on the front side, the front bridge girder forming form device has a structure capable of coping with both the construction of the bridge girder column head and the split girder construction of the bridge girder. It was necessary to be a frame device, and the structure of the mold device had to be complicated, heavy, and long, resulting in poor workability (see FIGS. 13 and 14).
[0014]
Thus, the present invention has been devised in order to address the above-mentioned conventional problems, and in the process of constructing a bridge, it is not necessary to always perform the work in a predetermined order, that is, to construct a projecting division of a bridge girder. Sometimes, the construction work of the next bridge girder column head can not be done simultaneously, for example, as in the past, a pair of bridge girder forming form devices are arranged on both sides of the bridge pier where the bridge girder column head is built, Since the bridge girder is divided and overhanged by the pair of bridge girder forming form devices, and then the bridge girder column head is not constructed by using the bridge girder forming form device on the front side (the front end side where the bridge girder is to be built). The construction work of the bridge girder split overhang and the construction work of the bridge girder column head of the next pier can be performed at the same time. As a result, the construction period of the bridge as a whole can be extremely shortened. To formwork equipment Concrete is an object of the present invention is to provide a bridge construction method and bridges construction apparatus that does not cause concern for poor complex and smokestack and workability.
[Means for Solving the Problems]
A bridge construction method and a bridge construction apparatus according to the present invention include:
A mobile erection girder is erected on the erected pier,
A step of forming a pair of bridge girders which are movable along the longitudinal direction of the movable girder and which are suspended from a pair of bridge girder column heads formed in advance on one pier by using a pair of bridge girder forming form devices. Along with the movable girder in the bridge girder construction direction front end side, the bridge girder column head forming form device movable along the movable girder allows a new bridge girder column head to be newly attached to the pier adjacent to the one pier. The steps of forming simultaneously
After the one bridge girder forming portion of the one pier side bridge girder column head is connected to the already formed bridge girder forming portion, the movable bridge girder is moved so that the tip side thereof is positioned on the next adjacent pier. Let
A step of dividing and forming a bridge girder with a bridge girder forming form device so as to project evenly from both sides of a bridge girder column head newly formed on a bridge pier adjacent to the one pier, and a bridge girder column head on a further adjacent pier It is characterized by forming a bridge girder on the pier by sequentially repeating the steps of forming the next new bridge girder column cap with the forming form device at the same time.
Or
A moving erection girder erected on an erect pier,
A pair of bridge girder forming form devices which are respectively suspended from the movable erection girder, are arranged on both sides of one of the piers on which the bridge girder is to be extended, and are movable in the longitudinal direction of the movable erection girder. ,
A bridge girder column head formation forming apparatus of a bridge girder suspended from the movable erection girder and arranged on a longitudinal end side of the movable erection girder and movable in the longitudinal direction of the movable erection girder;
With
The formwork device for forming a bridge girder is a suspension member hanging down from a movable construction girder, and connected to the suspension member, and arranged on both sides of the bridge girder construction direction with a bridge girder column head of a pier to be extended and constructed as a base. A bridge girder forming form member that divides the bridge girder from the both sides and overhangs the bridge girder,
The formwork device for forming a bridge girder column head of the bridge girder includes a hanging member hanging from the movable girder, and a next bridge girder column head construction connected to the hanging member and located on the longitudinal end side of the movable girder. A bridge girder column head forming form member that is arranged in the direction, and constructs a bridge girder column head on the pier,
Characterized in that
Or
The length of the movable erection girder is at least twice as long between the piers.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described based on an embodiment shown in the drawings.
[0016]
As understood from FIG. 1, a plurality of bridge piers 1 are erected at predetermined intervals in advance. In FIG. 1, the bridge girder 2 is erected and constructed from the left side to the right side.
[0017]
Reference numeral 20 denotes a bridge construction apparatus according to the present invention, which is a long movable erection girder 3 generally formed of a truss-like steel material, and a pair of bridge girder forming form devices 4 suspended from the movable erection girder 3. 4 and a bridge girder column head forming mold device 5 which is also suspended from the front end side of the movable erection girder 3 in the erection direction.
[0018]
The movable erection girder 3 can be moved in the erection direction of the bridge girder 2, but is supported on the bridge girder 2 under construction by the plurality of supports 6 at the time of erection work of the bridge girder 2.
[0019]
The bridge girder forming form device 4 is formed to have a hanging member 7 hanging from the movable erection girder 3 and a bridge girder forming form member 8 connected to the suspending member 7. Is movable in the longitudinal direction.
[0020]
The pair of bridge girder forming form devices 4, 4 are provided on both sides of the bridge girder 2 in the direction of erection of the bridge girder 2 with the bridge girder column head 9 of the bridge pier 1 (the pier 1 located at the center in FIG. 1) to be extended. The bridge girder 2 is configured so that the bridge girder 2 can be gradually divided from the bridge girder column head 9 of the pier 1 toward both sides thereof so as to be overhanging.
[0021]
As shown in FIG. 7, the bridge girder forming form member 8 includes a pair of side wall outer forms 10 and 10 arranged on both sides in the width direction of the bridge girder 2 to be constructed and the bridge girder 2 to be constructed. A bottom formwork 11 is disposed on the bottom surface side, and these formworks 10, 10, 11 are connected by a joining beam 12 or the like to form a so-called box-shaped bridge girder forming formwork member 8. .
[0022]
Then, concrete is poured into the pair of bridge girder forming form members 8 configured as described above, and after solidification of the concrete, the concrete is removed from the bridge girder and the bridge girder 2 is gradually overlaid.
[0023]
Next, the bridge girder column head forming form device 5 has a hanging member 7 hanging down from the movable erection girder 3 and a bridge girder column head forming mold member 18 connected to the hanging member 7. The movable erection girder 3 is also configured to be movable in the longitudinal direction.
[0024]
Here, in the case of a bridge having a continuous rigid frame structure, the bridge girder formwork members 18 are, as understood from FIG. 8, a pair of bridge girder capitals arranged on both sides in the width direction of the bridge girder 2 to be constructed. The side wall forms 13 are provided, but the bottom form is not provided.
[0025]
That is, since the bridge girder column head forming form 18 must form the bridge girder column head 9 and be connected to the upper surface of the pier 1, there is no need to provide a bottom formwork.
[0026]
Next, in the case of a bridge having a continuous girder structure, the bottom formwork 11 is provided on the bridge girder column head forming formwork member 18 in order to adopt a method of laying the bottom formwork 11 on the already completed pier 1. This is not necessary (see FIG. 9).
[0027]
As described above, the bridge girder column head forming mold member 18 is moved and arranged so as to form the bridge girder column head 9 on the pier 1. As will be understood from FIG. 8, FIG. 9, FIG. 11, and FIG. In addition, the bottom formwork 11 used for the portion corresponding to the upper surface of the pier 1 is not provided on the formwork member 18 for forming the bridge girder column head.
[0028]
That is, in the case of a bridge having a rigid frame structure, a portion corresponding to the upper surface of the pier 1 in the form member 18 for forming a bridge girder column head is configured as a space portion 14 for communicating the bridge girder column head 9 with the bridge pier 1. A formwork 16 is arranged on the formwork member 18 for forming the bridge girder column head so as to connect the upper surface of the bridge pier 1 and the bridge girder column head 9 to be formed from the space 14 part, and concrete can be poured into the formwork 16. (See FIG. 12).
[0029]
In order to adopt such a configuration, it is possible to sufficiently cope with a case where the construction boundary between the tip of the bridge pier 1 and the bridge girder column head 9 erected in advance is about 4 to 5 m below the girder of the bridge girder column head 9. is there.
[0030]
In the case of a bridge having a continuous girder structure, as understood from FIGS. 9 and 11, the bottom formwork 11 is laid on the pier 1 around the bearing 17. After the concrete for forming the bridge girder column head 9 is solidified, the bottom form 11 is removed.
[0031]
By the way, in the formwork device 5 for forming a bridge girder column head, overhanging formwork 15 is provided before and after the bridge girder 2 in the erection direction with the space 14 interposed therebetween (see FIGS. 10, 11 and 12). ). Further, as shown in the figure, the overhanging formwork 15 has a shape in which the bridge girder column heads 9 extend in the longitudinal direction of the erection direction, and the bottom surface thereof has an upward slope. It can be constructed (see FIG. 13).
[0032]
The construction state by the bridge construction apparatus of the present invention will be described.
[0033]
In the present invention, as shown in FIG. 3, the work of dividing and projecting the bridge girder 2 with the pair of bridge girder forming form devices 4 and 4 and the work of constructing the bridge girder column head 9 of the next pier 1 can be performed at the same time. In the drawings, reference numeral 21 indicates an auxiliary column.
[0034]
That is, as shown in FIG. 3 and FIG. 4, the above work can be performed simultaneously, and as shown in FIG. 5, when the connection of the left bridge girder 2 is completed, the movable bridge girder 3 is moved in the bridge girder 2 installation direction, 1 (see FIG. 6).
[0035]
Then, as described above, the work of constructing the split girder of the bridge girder by the pair of bridge girder forming form devices 4 and 4 and the construction work of the bridge girder column head 9 of the next pier 1 are simultaneously performed (FIG. 3, see FIG. 4).
[0036]
That is, the movable erection girder 3 is erected on the erected pier 1, and a pair of bridge girder forming form devices 4, 4 suspended so as to be movable along the longitudinal direction of the movable erection girder 3. A step of uniformly projecting from both sides of the bridge girder column head formed in advance on the pier 1 and constructing the bridge girder is performed.
[0037]
At the same time, the bridge pier 1 adjacent to the one pier 1 is suspended by the bridge girder column head forming form device 5 which is suspended at the leading end side of the movable erection girder 3 in the bridge girder 1 erection direction and is movable along the movable erection girder 3. Then, a step of newly forming the bridge girder column head 9 is performed (see FIGS. 3 and 4).
[0038]
Then, as understood from FIGS. 5 and 6, after the one-side bridge girder forming portion of the one pier 1-side bridge girder column head 9 is connected to the already formed bridge girder forming portion, the movable overhead girder is moved. 3 is moved so as to position the tip side on the next adjacent pier 1.
In this state, the bridge girder 2 is divided and formed by a pair of bridge girder forming form devices 4 and 4 so as to evenly project from both sides of the bridge girder column head 9 newly formed on the bridge pier 1 adjacent to the one pier 1. At the same time, the step of forming the next new bridge girder column head 9 with the bridge girder column head formation form device 5 on the adjacent pier 1 is performed (see FIG. 6), and this step is sequentially repeated. The bridge girder 2 is formed on the pier 1.
[0039]
By the way, in the present invention, when the length of the movable erection girder 3 is at least twice as long as the length between the piers 1 and 1, as shown in FIG. It can be installed near the pier 1.
[0040]
On the other hand, FIG. 17 shows an installation location of the plurality of support bases 6 in the conventional method. However, in the method of placing the plurality of supports 6 in the conventional method as shown in FIG. 17, in particular, negative bending of the bridge girder 2 near the pier 1 is caused by the reaction force of the support 6 installed on the tip side of the bridge girder 2 being formed. There was a risk of generating a moment.
[0041]
However, if the plurality of support bases 6 according to the present invention are placed as shown in FIG. 16, generation of a bending moment with respect to the bridge girder 2 can be prevented.
[0042]
Therefore, depending on the conditions of the span of the bridge girder 2 and the cross section of the bridge girder 2 so as to prevent the bridge girder 2 from bending in the conventional bending moment, a reinforcing member such as a temporary cable for reinforcement may be required. However, according to the present invention, no reinforcing member such as a temporary cable is required.
【The invention's effect】
Thus, the present invention has the above configuration.
[0043]
In the bridge construction method and the bridge construction apparatus according to the present invention, it is not necessary to always perform the work in a predetermined order in the bridge construction process, that is, by performing the split overhang construction of the bridge girder as in the related art. When it is, there is no possibility that the construction work of the next bridge girder can not be performed at the same time.For example, a pair of bridge girder forming form devices are arranged on both sides of the pier where the bridge girder is built, and the pair of bridge girder Since the bridge girder is divided and overhanged by the forming form device, the bridge girder column head is not constructed by using the bridge girder forming form device on the front side (front end side where the bridge girder is to be built). The overhanging construction work and the construction work of the bridge girder column head of the next pier can be performed at the same time, and as a result, the construction period of the entire bridge can be extremely shortened.
[0044]
Further, there is an excellent effect that the structure of the formwork device is complicated, heavy and long, and workability does not deteriorate as in the related art.
[Brief description of the drawings]
FIG. 1 is a configuration explanatory diagram illustrating a configuration of a bridge construction apparatus according to the present invention.
FIG. 2 is a schematic explanatory diagram (part 1) illustrating a state in which a bridge girder and a bridge girder column head are simultaneously constructed using the bridge construction apparatus according to the present invention.
FIG. 3 is a schematic explanatory view (part 2) illustrating a state in which a bridge girder and a bridge girder column head are simultaneously constructed using the bridge construction apparatus according to the present invention.
FIG. 4 is a schematic explanatory view (part 3) illustrating a state in which a bridge girder and a bridge girder column head are simultaneously constructed using the bridge construction apparatus according to the present invention.
FIG. 5 is a schematic explanatory view (part 4) illustrating a state in which a bridge girder and a bridge girder column head are simultaneously constructed using the bridge construction apparatus according to the present invention.
FIG. 6 is a schematic explanatory view (part 5) illustrating a state in which a bridge girder and a bridge girder column head are simultaneously constructed using the bridge construction apparatus according to the present invention.
FIG. 7 is a configuration explanatory view illustrating a configuration of a bridge girder forming form member according to the present invention.
FIG. 8 is a configuration explanatory view (part 1) illustrating the configuration of a form member for forming a bridge girder column head according to the present invention.
FIG. 9 is a configuration explanatory view (part 2) for explaining the configuration of the bridge girder column head forming mold member according to the present invention;
FIG. 10 is an explanatory view for explaining a projecting direction of a projecting formwork in a form member for forming a bridge girder column head according to the present invention.
FIG. 11 is an explanatory view (part 1) for explaining a projecting direction of a projecting formwork in a form member for forming a bridge girder column head according to the present invention as viewed from a side.
FIG. 12 is an explanatory view (part 2) for explaining the projecting direction of the projecting formwork in the formwork member for forming a bridge girder column head according to the present invention as viewed from the side.
FIG. 13 is a schematic explanatory diagram illustrating a state where a bridge girder has been constructed using the bridge construction apparatus according to the present invention.
FIG. 14 is a configuration explanatory view (No. 1) illustrating the configuration of a formwork device for constructing a bridge girder and a bridge girder column head according to a conventional example.
FIG. 15 is a configuration explanatory view (part 2) illustrating the configuration of a formwork device for constructing a bridge girder and a bridge girder column head according to a conventional example.
FIG. 16 is a schematic explanatory diagram illustrating a bending moment of a bridge girder when a bridge girder is constructed using the movable erection girder according to the present invention.
FIG. 17 is a schematic explanatory view for explaining a bending moment of a bridge girder when a bridge girder is constructed using a movable erection girder according to a conventional example.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 bridge pier 2 bridge girder 3 movable erection girder 4 bridge girder forming form device 5 bridge girder column head forming form device 6 support base 7 hanging member 8 bridge girder forming form member 9 bridge girder column head 10 side wall forming member 11 bottom Formwork 12 Joining beam 13 Side wall formwork 14 for forming bridge girder column head 14 Space 15 Overhanging formwork 16 Formwork 17 Bearing 18 Formwork member 20 for forming bridge girder column head 20 Bridge construction device 21 Auxiliary column 22 Height and gradient adjustment block

Claims (3)

A mobile erection girder is erected on the erected pier,
A step of forming a pair of bridge girders which are movable along the longitudinal direction of the movable girder and which are suspended from a pair of bridge girder column heads formed in advance on one pier by using a pair of bridge girder forming form devices. Along with the movable girder in the bridge girder construction direction front end side, the bridge girder column head forming form device movable along the movable girder allows a new bridge girder column head to be newly attached to the pier adjacent to the one pier. The steps of forming simultaneously
After the one bridge girder forming portion of the one pier side bridge girder column head is connected to the already formed bridge girder forming portion, the movable bridge girder is moved so that the tip side thereof is positioned on the next adjacent pier. Let
A step of dividing and forming a bridge girder with a bridge girder forming form device so as to project evenly from both sides of a bridge girder column head newly formed on the bridge pier adjacent to the one pier, and a bridge girder column head on a further adjacent pier A bridge construction method, wherein a bridge girder is formed on a pier by sequentially and simultaneously repeating a step of forming a new bridge girder column head with a forming form device. A moving erection girder erected on the erected pier,
A pair of bridge girder forming form devices which are respectively suspended from the movable erection girder, are arranged on both sides of one of the piers on which the bridge girder is to be extended, and are movable in the longitudinal direction of the movable erection girder. ,
A bridge girder column head formation forming apparatus of a bridge girder suspended from the movable erection girder and arranged on a longitudinal end side of the movable erection girder and movable in the longitudinal direction of the movable erection girder;
With
The formwork device for forming a bridge girder is a suspension member hanging down from a movable construction girder, and connected to the suspension member, and arranged on both sides of the bridge girder construction direction with a bridge girder column head of a pier to be extended and constructed as a base. A bridge girder forming form member that divides the bridge girder from the both sides and overhangs the bridge girder,
The formwork device for forming a bridge girder column head of the bridge girder includes a hanging member hanging from the movable girder, and a next bridge girder column head construction connected to the hanging member and located on the longitudinal end side of the movable girder. A bridge girder column head forming form member that is arranged in the direction and constructs a bridge girder column head on the pier,
A bridge construction apparatus, characterized in that: The bridge construction method and the bridge construction apparatus according to claim 1 or 2, wherein the length of the movable erection girder is configured to be at least twice as long between the piers.

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