JP3790229B2 - Bridge construction method and bridge construction apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bridge construction device that divides and constructs a bridge girder made of prestressed concrete between standing piers.
[Prior art]
2. Description of the Related Art Conventionally, a so-called P & Z method is generally known as a method of building a bridge girder made of prestressed concrete, for example, by using a so-called moving erection girder.
[0002]
In this P & Z method, a moving installation girder having a length of, for example, about 15 m to 20 m longer than a span to be installed is used between predetermined piers.
[0003]
A pair of bridge girder forming frame devices are suspended in the movable erection girder so as to be movable in the longitudinal direction.
[0004]
In the operation using the movable erection girder, the three gantry supporting the movable erection girder on the upper part of the pier or the like, and the tip auxiliary column used at the time of movement are also used.
[0005]
Here, in the P & Z method, a pair of bridge girder forming frame devices suspended from the movable erection girder are arranged on both sides of the bridge pier, and the bridge girder is balanced with exquisite balance using the principle of the so-called staggering. The division overhang construction is performed.
[0006]
Therefore, by using such a P & Z method, it is possible to construct relatively easily even for the construction of a so-called large span PC bridge.
[0007]
However, when the bridge girder is divided and constructed, it is necessary to first construct the bridge girder head on the upper part of the pier.
[0008]
This is because, after the bridge girder head is constructed, a pair of bridge pier forming frame devices are arranged on both sides of the bridge girder head as a main axis, and the bridge girder is divided and constructed. .
[0009]
Details of this P & Z method are described in Japanese Patent Publication No. 59-47762.
[0010]
[Patent Document 1]
Japanese Patent Publication No. 59-47762 [Problems to be Solved by the Invention]
However, considering the case of construction using a so-called P & Z device based on the conventional P & Z method, the conventional P & Z device uses a bridge girder forming form device on the so-called front side (the tip direction side where the bridge girder should be constructed). The column head is constructed, but the bridge girder overhang construction work must always be given priority from the order of the P & Z process.
[0011]
In other words, conventionally, a pair of bridge girder forming frame devices are arranged on both sides of the pier where the bridge girder heads are constructed, and the bridge girder is divided and constructed by the pair of bridge girder forming frame devices. The bridge girder column head was constructed using the bridge girder forming form device on the front side (the end direction side where the bridge girder should be constructed).
[0012]
Thus, in the past, the construction work of split overhanging of the bridge girder and the construction work of the bridge girder column head at the next bridge pier could never be performed at the same time, and as a result, the construction period of the entire bridge was inevitably long. There was a problem that the work cost increased.
[0013]
In addition, in order to construct the bridge girder column head with the formwork device for forming the bridge girder on the front side, in particular, the form device for forming the bridge girder on the front side has a structure that can cope with both construction of the bridge girder head and construction of split overhang of the bridge girder. It is necessary to be a frame device, and the structure of the mold device has to be complicated and heavy, and the workability is poor (see FIGS. 13 and 14).
[0014]
Thus, the present invention was devised to cope with the above-mentioned conventional problems, and it is not necessary to always perform the work in a predetermined order in the bridge construction process, that is, the bridge girder is divided and constructed. Sometimes, the construction work of the next bridge girder head can not be done at the same time, for example, as in the past, a pair of bridge girder forming formwork devices are arranged on both sides of the pier where the bridge girder head was built, Since the bridge girder is divided and constructed by the pair of bridge girder forming frame devices, and then the bridge girder column head is not constructed by using the bridge girder forming form device on the front side (the end direction side where the bridge girder should be constructed). The construction work of split overhanging of the bridge girder and the construction work of the bridge girder head of the next bridge pier can be done at the same time. As a result, the construction period of the bridge as a whole can be extremely shortened. Of 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]
The bridge construction method and the bridge construction apparatus according to the present invention are:
A moving girder was installed on the pier that was erected,
A pair of bridge girder forming formwork devices that are suspended so as to be movable along the longitudinal direction of the movable erection girder, and are formed by projecting evenly from both sides of the bridge girder column heads formed in advance on one pier and dividing the bridge girder. In addition, a bridge girder head is newly attached to the bridge pier adjacent to the one pier by a formwork device for forming a bridge girder head that is suspended at the front end side of the bridge girder in the moving girder and movable along the moving girder. Perform the process of forming simultaneously,
One side bridge girder forming part of the one pier side bridge girder stigma portion, after being connected to the bridge girder forming portion that is already formed, so as to be positioned on the piers of the next adjacent the distal end side of the moving rack setting digit Move
A bridge girder head is formed on a bridge pier adjacent to the one pier, and a bridge girder is formed by dividing the bridge girder by a formwork device for bridge girder so that the bridge girder head is newly formed on both sides of the bridge girder. In order to form the bridge girder on the pier, sequentially repeating the process of forming the next new bridge girder head with the forming formwork device .
The bridge girder head forming mold apparatus has a suspension member that hangs down from the movable installation girder, and a bridge girder column head forming mold member that is connected to the suspension member, and the bridge girder column head forming mold. The frame member has a pair of bridge girder column head side wall molds arranged on both sides in the width direction of the bridge girder to be constructed, and has a configuration that does not have a bottom mold frame corresponding to the upper surface of the pier.
It is characterized by
Or
A moving girder erected on a standing pier,
A pair of bridge girder forming form devices that are respectively suspended from the movable erection girder and are arranged on both sides of one pier to be constructed by extending the bridge girder among the piers and are movable in the longitudinal direction of the movable erection girder; ,
A formwork device for forming a bridge girder column head of a bridge girder suspended from the movable erection girder and arranged on the longitudinal end side of the movable erection girder and movable in the longitudinal direction of the movable erection girder,
With
The formwork device for bridge girder formation is arranged on both sides of the bridge girder erection direction with the suspension member hanging from the movable erection girder and the bridge girder column head of the bridge pier that is connected to the suspension member and is to be built and built. A bridge girder forming form member that divides and constructs a bridge girder from both sides, and a bridge girder head forming form unit for the bridge girder includes a suspension member that hangs down from a movable installation girder, A bridge girder head forming mold member connected to the suspension member, and the bridge girder head forming mold member includes a pair of bridge girder head side walls disposed on both sides in the width direction of the bridge girder to be constructed. It has a formwork and a structure that does not have a bottom formwork corresponding to the upper surface of the pier, and is arranged in the next bridge girder column head construction direction located on the longitudinal end side of the movable erection girder, on the pier Build the bridge girder head ,
It is characterized by
Or
The length of the movable installation girder is configured to be at least twice as long between the piers.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described based on embodiments shown in the drawings.
[0016]
As understood from FIG. 1, a plurality of bridge piers 1 are erected in advance with a predetermined interval. In FIG. 1, the bridge girder 2 is constructed and constructed from the left side toward the right side.
[0017]
Reference numeral 20 denotes a bridge construction apparatus according to the present invention, which is generally a long movable installation girder 3 formed of a steel material in the form of a truss, and a pair of bridge girder forming frame apparatuses 4 suspended from the movable installation girder 3. 4 and a formwork device 5 for forming a bridge girder column head that is also suspended from the front end side in the installation direction of the movable installation girder 3.
[0018]
The movable girder 3 is movable in the direction in which the bridge girder 2 is erected, but is supported on the bridge girder 2 being constructed by a plurality of support bases 6 when the bridge girder 2 is erected.
[0019]
The bridge girder forming form device 4 is formed to have a suspension member 7 hanging from the movable erection girder 3 and a bridge girder forming form member 8 connected to the suspending member 7. It is possible to move in the longitudinal direction.
[0020]
A pair of bridge girder forming frame devices 4 and 4 are provided on both sides of the bridge girder 2 in the installation direction with the bridge girder column head 9 of the bridge pier 1 (the pier 1 positioned in the middle in FIG. 1) as a base. The bridge girder 2 is constructed so that it can be constructed by gradually dividing the bridge girder 2 from the bridge girder column head 9 of the pier 1 toward both sides thereof.
[0021]
Here, as is understood from FIG. 7, the bridge girder forming form member 8 includes a pair of side wall outer molds 10, 10 disposed 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 mold 11 is arranged on the bottom side, and these molds 10, 10, 11 are connected by a joining beam 12 or the like to form a so-called box-shaped form member 8 for forming a bridge girder. .
[0022]
Thus, concrete is cast into the pair of bridge girder forming frame members 8 configured as described above, and after the concrete is solidified, it is removed from the mold, and the bridge girder 2 is gradually overhang constructed.
[0023]
Next, the formwork device 5 for forming the bridge girder head portion includes a suspension member 7 that hangs down from the movable installation girder 3, and a formwork member 18 for forming the bridge girder head portion connected to the suspension member 7. It is also configured to be movable in the longitudinal direction of the movable installation girder 3.
[0024]
Here, in the case of a bridge having a continuous rigid frame structure, the bridge girder head mold member 18 is a pair of bridge girder heads arranged on both sides in the width direction of the bridge girder 2 to be constructed, as understood from FIG. Partial side wall molds 13 and 13 are provided, but no bottom mold is provided.
[0025]
That is, the bridge girder head forming mold 18 has to form the bridge girder head 9 and be connected to the upper surface of the pier 1, so that it is not necessary to provide a bottom mold.
[0026]
Next, even in the case of a bridge having a continuous girder structure, the bottom mold 11 is provided in the bridge column head forming mold member 18 in order to lay the bottom mold 11 on the already completed pier 1. This is not necessary (see FIG. 9).
[0027]
As described above, the formwork member 18 for forming the bridge girder head is moved and arranged to form the bridge girder head 9 on the pier 1, as will be understood from FIGS. 8, 9, 11, and 12. In addition, the bottom mold 11 used at the location corresponding to the upper surface of the pier 1 is not provided on the bridge girder head forming mold member 18.
[0028]
That is, in the case of a bridge having a ramen structure, the portion corresponding to the upper surface of the pier 1 in the form member 18 for forming the bridge girder head is configured as a space portion 14 for communicating the bridge girder head 9 and the pier 1. A mold 16 is arranged on a bridge girder head forming mold member 18 so as to connect the upper surface of the pier 1 and the bridge girder head 9 to be formed from the space 14, and concrete can be placed in the mold 16. (See FIG. 12).
[0029]
In order to adopt such a configuration, even if the construction boundary between the tip of the pier 1 and the bridge girder head 9 which is erected in advance is about 4 to 5 m below the girder head 9, it can sufficiently cope. is there.
[0030]
In the case of a bridge with a continuous girder structure, as will be understood from FIGS. 9 and 11, the bottom formwork 11 is laid on the bridge pier 1 around the support 17. Thus, after the concrete for forming the bridge girder head 9 is solidified, the bottom mold 11 is removed.
[0031]
By the way, in the bridge girder head form forming apparatus 5, projecting molds 15 and 15 are respectively provided before and after the bridge girder 2 in the erection direction (see FIGS. 10, 11, and 1212). ). Further, as shown in the figure, the projecting molds 15 and 15 are formed so that the bridge girder heads 9 each extend in the front-rear direction of the erection direction, and the bottom surface has an upward slope. It can also be constructed (see FIG. 13).
[0032]
The construction state by the bridge construction apparatus of this invention is demonstrated.
[0033]
In the present invention, as shown in FIG. 3, a split overhang construction work of the bridge girder 2 and a construction work of the bridge girder head 9 of the next bridge pier 1 can be performed simultaneously with a pair of bridge girder forming frame devices 4 and 4. In addition, the code | symbol 21 shows an auxiliary | assistant support | pillar in the figure.
[0034]
That is, as shown in FIG. 3 and FIG. 4, the above work can be simultaneously performed. When the connection of the left bridge girder 2 portion is completed as shown in FIG. 5, the movable erection girder 3 is moved in the direction of erection of the bridge girder 2. 1 is supported at the upper part (see FIG. 6).
[0035]
Then, as described above, the construction for splitting overhanging of the bridge girder by the pair of bridge girder forming frame devices 4 and 4 and the construction work of the bridge girder column head 9 of the next bridge pier 1 are simultaneously performed (see FIG. 3, see FIG.
[0036]
That is, the movable girder 3 is erected on the standing pier 1 and the pair of bridge girder forming frame devices 4, 4 suspended so as to be movable along the longitudinal direction of the movable girder 3. A step is carried out in which the bridge girder is divided and formed by evenly projecting from both sides of the bridge girder column head formed in advance on the pier 1.
[0037]
At the same time, the bridge pier 1 adjacent to the one pier 1 is suspended by the bridge girder head forming formwork device 5 that is suspended at the leading end side of the bridge girder 1 in the construction direction of the movable girder 3 and is movable along the movable girder 3. The step of newly forming the bridge girder head 9 is performed (see FIGS. 3 and 4).
[0038]
Then, 5, after the one side girder forming part of the one pier 1 side bridge girder stigmas 9 As can be understood from FIG. 6, is connected to the bridge girder forming portion that is already formed, the moving rack set The tip side of the girder 3 is then moved to be positioned on the adjacent pier 1.
In this state, the bridge girder 2 is divided and formed by a pair of bridge girder forming frame devices 4 and 4 so that the bridge girder column heads 9 newly formed on the pier 1 adjacent to the one pier 1 are uniformly projected from both sides. At the same time, the step of forming the next new bridge girder head 9 with the bridge girder head forming formwork 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 installation 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. Thus, in the conventional method of placing the plurality of support bases 6 as shown in FIG. 17, the negative bending of the bridge girder 2 in the vicinity of the pier 1 is caused by the reaction force of the support base 6 installed on the tip side of the bridge girder 2 being formed. There was a risk of generating moments.
[0041]
However, if the plurality of support bases 6 according to the present invention are placed as shown in FIG. 16, it is possible to prevent the bending moment from being generated with respect to the bridge girder 2.
[0042]
Therefore, depending on conditions such as the span of the formed bridge girder 2 and the cross section of the bridge girder 2 so that the bending girder 2 does not bend due to the generation of a bending moment, a reinforcing member such as a temporary cable for reinforcement may be required. However, according to the present invention, a reinforcing member such as a temporary cable is not required at all.
【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, the bridge girder division overhang construction is performed as in the past. For example, a pair of bridge girder forming frame devices are arranged on both sides of the bridge pier where the bridge girder head is constructed, and the pair of bridge girder heads cannot be constructed at the same time. The bridge girder is divided and built by the forming formwork device, and then the bridge girder column head is not built using the bridge girder forming formwork device on the front side (the end direction side where the bridge girder should be built). The overhang construction work and the construction work for the bridge girder head of the next pier can be performed at the same time. As a result, the construction period of the entire bridge can be extremely shortened.
[0044]
Further, as in the prior art, the structure of the formwork apparatus is complicated and heavy, so that the workability is not deteriorated.
[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 (No. 1) for explaining a state in which a bridge girder and a bridge girder column head are constructed at the same time using the bridge construction apparatus according to the present invention.
FIG. 3 is a schematic explanatory diagram (No. 2) for explaining a state in which a bridge girder and a bridge girder head are simultaneously constructed using the bridge construction device according to the present invention.
FIG. 4 is a schematic explanatory diagram (No. 3) for explaining a state in which a bridge girder and a bridge girder column head are constructed at the same time using the bridge construction apparatus according to the present invention.
FIG. 5 is a schematic explanatory diagram (No. 4) for explaining a state in which a bridge girder and a bridge girder column head are simultaneously constructed using the bridge construction device according to the present invention.
FIG. 6 is a schematic explanatory diagram (No. 5) for explaining a state in which a bridge girder and a bridge girder column head are simultaneously constructed using the bridge construction device according to the present invention.
FIG. 7 is a structural explanatory view illustrating the structure of a bridge girder forming form member according to the present invention.
FIG. 8 is a configuration explanatory view (No. 1) illustrating the configuration of a bridge beam head forming mold member according to the present invention.
FIG. 9 is a configuration explanatory view (No. 2) illustrating the configuration of the bridge beam head forming mold member according to the present invention.
FIG. 10 is an explanatory view for explaining a projecting direction of a projecting mold frame in a bridge girder head forming mold member according to the present invention.
FIG. 11 is an explanatory diagram (No. 1) for explaining a projecting direction of a projecting mold in the bridge girder head forming mold member according to the present invention as seen from the side surface.
FIG. 12 is an explanatory diagram (No. 2) for explaining the projecting direction of the projecting mold in the bridge girder head forming mold member according to the present invention as viewed from the side surface.
FIG. 13 is a schematic explanatory diagram for explaining a state in which a bridge girder is constructed using the bridge construction apparatus according to the present invention.
FIG. 14 is a configuration explanatory view (No. 1) illustrating a configuration of a formwork apparatus for constructing a bridge girder and a bridge girder column head according to a conventional example.
FIG. 15 is a configuration explanatory view (No. 2) illustrating the configuration of a formwork apparatus for constructing a bridge girder and a bridge girder column head according to a conventional example.
FIG. 16 is a schematic explanatory diagram for explaining a bending moment of a bridge girder when a bridge girder is constructed using a moving erection girder according to the present invention.
FIG. 17 is a schematic explanatory diagram illustrating a bending moment of a bridge girder when a bridge girder is constructed using a moving erection girder according to a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Bridge pier 2 Bridge girder 3 Moving installation girder 4 Formwork device for bridge girder formation 5 Formwork device 6 for bridge girder head formation 6 Support base 7 Hanging member 8 Formwork member for bridge girder formation 9 Bridge girder head 10 Formwork member 11 for side wall Formwork 12 Joint beam 13 Side wall formwork 14 for bridge girder head forming 14 Space part 15 Overhang formwork 16 Form 17 Support 18 Formwork member 20 for forming bridge girder head 20 Bridge construction device 21 Auxiliary support 22 Height and gradient adjustment block

Claims (3)

A mobile girder was installed on the pier that was erected,
A pair of bridge girder forming formwork devices that are suspended so as to be movable along the longitudinal direction of the movable erection girder, and are formed by projecting evenly from both sides of the bridge girder column heads formed in advance on one pier and dividing the bridge girder. In addition, a bridge girder head is newly attached to the bridge pier adjacent to the one pier by a formwork device for forming a bridge girder head that is suspended at the front end side of the bridge girder in the moving girder and movable along the moving girder. Perform the process of forming simultaneously,
One side bridge girder forming part of the one pier side bridge girder stigma portion, after being connected to the bridge girder forming portion that is already formed, so as to be positioned on the piers of the next adjacent the distal end side of the moving rack setting digit Move
A bridge girder head is formed on the bridge pier adjacent to the one pier with a step of dividing the bridge girder with a bridge girder formwork device so that the bridge girder head is newly formed on both sides of the bridge pier adjacent to the one pier. In order to form the bridge girder on the pier, sequentially repeating the process of forming the next new bridge girder head with the forming formwork device .
The bridge girder head forming mold apparatus has a suspension member that hangs down from the movable installation girder, and a bridge girder column head forming mold member that is connected to the suspension member, and the bridge girder column head forming mold. The frame member has a pair of bridge girder head side wall molds arranged on both sides in the width direction of the bridge girder to be constructed, and has a configuration not having a bottom mold frame corresponding to the upper surface of the pier.
The bridge construction method characterized by this. A moving girder erected on a standing pier,
A pair of bridge girder forming form devices that are respectively suspended from the movable erection girder and are arranged on both sides of one pier to be constructed by extending the bridge girder among the piers and are movable in the longitudinal direction of the movable erection girder; ,
A formwork device for forming a bridge girder column head of a bridge girder suspended from the movable erection girder and arranged on the longitudinal end side of the movable erection girder and movable in the longitudinal direction of the movable erection girder,
With
The formwork device for bridge girder formation is arranged on both sides of the bridge girder erection direction with the suspension member hanging from the movable erection girder and the bridge girder column head of the bridge pier that is connected to the suspension member and is to be built and built. A bridge girder forming form member that divides and constructs the bridge girder from both sides, and
The formwork device for forming the bridge girder head of the bridge girder includes a suspension member that hangs down from the movable installation girder and a formwork member for forming the bridge girder head portion connected to the suspension member, The formwork member has a pair of bridge girder head side wall molds arranged on both sides in the width direction of the bridge girder to be constructed, and does not have a bottom mold frame corresponding to the upper surface of the bridge pier. Arranged in the next bridge girder head construction direction located on the longitudinal end of the girder, and constructing the bridge girder head on the pier ,
This is a bridge construction device. The bridge construction apparatus according to claim 2, wherein a length of the movable erection girder is configured to be at least twice as long between the piers.

Images