JP4128887B2 - How to install a three-dimensional crossover viaduct - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for constructing a three-dimensional intersection viaduct at an intersection.
[0002]
[Prior art]
Conventionally, when a viaduct is installed, a girder is installed on a main girder in the middle of the construction, and the girder is used to extend the main girder for each span.
[0003]
In this erection method, for example, as described in Patent Document 1, the girder is moved forward by one span each time the extension erection between each diameter is completed.
[0004]
[Patent Document 1]
JP, 2000-230206, A [Problems to be solved by the invention]
However, in the above conventional construction method, when constructing the intersection part of the main girder located between the intersections spanning the intersection, the traffic on the intersecting road during the girder moving work and the main girder construction work Regulations need to be made.
[0005]
At that time, the girder movement work can be done in a relatively short time, but the construction work of the main girder takes a relatively long time, so it is necessary to regulate the traffic on the intersecting road for a long time There's a problem.
[0006]
The present invention has been made in view of such circumstances, and when a three-dimensional intersection viaduct is constructed at an intersection, a method for constructing a three-dimensional intersection viaduct that can alleviate the need for traffic regulation of intersecting roads. It is intended to provide.
[0007]
[Means for Solving the Problems]
In the present invention, the above-described object is achieved by devising a construction method of the crossing portion constituting the main girder.
[0008]
That is, the construction method of the three-dimensional intersection viaduct according to the present invention is:
In a method of constructing a three-dimensional intersection viaduct at an intersection,
Install girder on the main girder in the middle of erection,
Using this girder, the intersection portion of the main girder located between the intersection diameters across the intersection, together with the leg head segments located on both sides in the bridge axis direction of the intersection portion, the intersection diameter In a state where the plurality of precast segments and the both leg head segments constituting the intersection portion are connected and arranged in a span adjacent to the front side between the plurality of precast segments and the both leg head segments connected to each other. After preliminarily erection by performing joint work between each segment and inserting and tensioning PC steel ,
This intersection part is moved between the intersection diameters ,
Thereafter, the main girder is extended between the adjacent diameters on the near side between the intersection diameters .
[0009]
The specific configuration such as the length of the “girder” and the number of installations is not particularly limited.
[0010]
The specific configuration of the above “intersection portion” is not particularly limited, and the specific method for “moving the intersection portion between the intersection diameters” is also particularly limited. It is not something.
[0011]
[Effects of the invention]
As shown in the above configuration, the method of installing the three-dimensional crossover viaduct according to the present invention is to install a girder on the main girder in the middle of the construction when installing the three-dimensional crossover viaduct at the intersection, and using this girder, After the cross-section component is preliminarily installed with the leg head segments located on both sides in the bridge axis direction and adjacent to the front side of the cross-section diameter, the cross-section configuration section is moved between the cross-section diameters. Thus, the following operational effects can be obtained.
[0012]
That is, when the main girder construction work is performed between the intersections as in the past, it is necessary to carry out traffic regulation of the intersecting road over a long period of time. If preliminary erection is performed at, traffic regulation due to the erection work of the intersection portion itself can be eliminated.
[0013]
Therefore, according to this invention, when constructing a three-dimensional intersection viaduct at an intersection, the necessity of traffic regulation of the intersecting road can be eased.
[0014]
Moreover, in the present invention, since the main girder bridge surface that has been installed can be used for material transportation, the installation yard can be reduced in size.
[0015]
In the above configuration, when the intersection part is preliminarily installed, it is suspended and fixed to the girder, and the girder is moved to move the intersection part. It is possible to restrict traffic on the intersecting roads only when working.
[0016]
Instead of doing this, when the intersection part is preliminarily installed, it is suspended on the girder via the traveling device, and the intersection part is moved by moving the traveling device. In this case, it is only necessary to restrict the traffic on the intersecting road only when moving the intersection portion. Further, in this case, it is not necessary to move the girder for the construction of the intersection portion constituting portion, so that the construction work can be simplified correspondingly.
[0017]
Also, in the above configuration, when preliminarily constructing the intersection portion, the foundation work and the pier located at the front end between the intersection diameters are constructed simultaneously with the preliminary construction using the girder. Then, the work efficiency of the erection work can be improved.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0019]
1-3 is a side view which shows the process of the construction method of the three-dimensional intersection viaduct concerning one Embodiment of this invention.
[0020]
As shown in FIG. 1 (a), a three-dimensional intersection viaduct to be installed in the installation method according to the present embodiment is installed along a road 102 extending in the left-right direction in the drawing, and is a road orthogonal to the road 102. It is constructed so as to straddle the road at the intersection 104.
[0021]
This three-dimensional crossover viaduct includes a plurality of piers 12 installed at predetermined intervals along the central separation zone of the road 102, and a main girder 14 installed at the upper ends of the plurality of piers 12. Yes. The main girder 14 has a plurality of precast segments 22 connected and arranged in the bridge axis direction.
[0022]
In the present embodiment, a pair of left and right girders 50 are installed on the main girder 14 in the middle of the erection, and the girder 50 is used to extend the main girder 14 in the spans S1, S2,. Construction of the foundation work 16 and the pier 12 located at the front end of the preceding spans S2, S3,... Adjacent to the front side is performed simultaneously. In this three-dimensional crossover viaduct, the fourth span S4 from the end constitutes the intersection span located at the intersection 104.
[0023]
Both girders 50 are installed so as to extend from the midway position of the first span S1 to the midway position of the intersection span S4.
[0024]
In order to realize this, the leg head segments 22A to be installed on the bridge piers of the piers 12A and 12B located on both front and rear sides of the second span S2 among the plurality of precast segments 22 constituting the main girder 14, For 22B, these are installed in advance on the bridge piers of both piers 12A and 12B, and supporters 52A and 52B are installed on the upper surfaces of these leg head segments 22A and 22B. 50 is supported. Further, a support post 54 is also installed in the vicinity of the rear end portion of the cross section span S4, a support work 52C is installed on the upper end surface of the support post 54, and the front end part of the girder 50 is supported by the support work 52C. It is supposed to be. At that time, rollers are provided at the upper ends of the respective supporting works 52A, 52B, 52C, thereby supporting the girder 50 in a state of being movable in the front-rear direction.
[0025]
An excavator 58 and a portal crane 60 are installed in the vicinity of the front ends of both girders 50 so as to be movable in the front-rear direction.
[0026]
The foundation work 16 located below each pier 12 is composed of a footing 32 and a pair of cast-in-place steel pipe concrete piles 34 in the front and rear. And when performing this foundation work 16, while excavating a pile hole using the excavator 58, the portal crane 60 is used to convey and embed steel pipes. In addition, when constructing each pier 12, necessary materials are transported using the portal crane 60.
[0027]
The main girder 14 in each span S1, S2,... Is constructed by connecting and arranging a plurality of precast segments 22 in the bridge axis direction. At that time, each precast segment 22 is suspended by a segment moving device (not shown) on the bridge surface of the main girder 14 that has been installed, and in this state, it is carried into the span to be installed. Yes.
[0028]
However, with regard to the intersection portion 14A of the main girder 14 located in the intersection span S4, the intersection portion 14A is used together with the leg head segments 22C and 22D located on both sides in the bridge axis direction. After preliminarily erection in the third span S3 adjacent to the front side of the interval S4, the erection is performed by moving to the intersection span S4.
[0029]
Hereinafter, the construction process of the intersecting portion constituting portion 14A will be specifically described.
[0030]
First, as shown in FIG. 1 (a), after an extrusion device 56 and a vertical jack (not shown) are installed on the upper end surface of the pier 12C located at the rear end of the intersection span S4, the leg head segment 22D and a part of the precast segment 22 constituting the intersection component 14A are arranged on the extrusion device 56.
[0031]
Next, as shown in FIG. 4B, the girder 50 is formed to extend forward, and the excavator 58 and the portal crane 60 are moved closer to the front end of the girder 50.
[0032]
Next, as shown in FIG. 5C, the remaining precast segment 22 and leg head segment 22C constituting the intersection portion 14A are connected and arranged. Then, jointing between the plurality of precast segments 22 and leg head segments 22C and 22D arranged in connection with each other and insertion and tension of the PC steel material are performed, so that the preliminary construction of the intersection portion 14A is performed. Complete the erection.
[0033]
Next, as shown in FIG. 2 (d), the crossing component 14 </ b> A and the leg head segments 22 </ b> C and 22 </ b> D that are connected and arranged are suspended and fixed to the girder 50 by a plurality of PC steel bars 62. At this time, the excavator 58 excavates the pile hole at the front end portion of the intersection span S4 as the foundation work 16D.
[0034]
Next, as shown in FIG. 5E, a temporary support column 64 having a roller provided at the upper end portion is installed at a substantially central position of the third span S3, and the intersecting portion constituting portion 14A is moved in the front-rear direction. Support as possible. At this time, at the front end portion of the intersection span S4, as the foundation work 16D, steel pipe piles are inserted into the pile holes, reinforcing bars are placed, and concrete is placed.
[0035]
Next, as shown in FIG. 5F, the crossing component 14A and the leg head segments 22C and 22D are moved forward together with the girder 50 by the pushing device 56. At this time, at the front end of the intersection span S4, the pier 12D is constructed and the roller 66 is installed on the bridge seat.
[0036]
Then, as shown in FIG. 3G, after the girder 50 is moved to a position where the leg head segment 22D reaches the roller 66 of the pier 12D, this movement is stopped.
[0037]
Finally, as shown in FIG. 6 (h), the push-out device 56 and the roller 66 are removed from the bridge seats of the piers 12C and 12D, the suspension by the PC steel rod 62 is released, and then the vertical jack is jacked down. Then, by setting the leg head segments 22C and 22D to the bridge support 38 of the bridge piers 12C and 12D, the construction of the intersection portion 14A is completed. After that, the extension of the main girder 14 in the third span S3 is performed.
[0038]
As described above in detail, the method of installing the three-dimensional crossover viaduct according to the present embodiment sets a pair of left and right girders 50 on the main girder 14 in the middle of the installation when installing the three-dimensional crossover viaduct at the intersection 104. Using the girder 50, the intersection portion 14A of the main girder 14 is preliminary in the span S3 adjacent to the front side of the intersection span S4 together with the leg head segments 22C and 22D located on both sides in the bridge axis direction. Since the intersection portion 14A is moved to the intersection span S4 after the installation, the traffic regulation due to the installation work itself of the intersection portion 14A can be made unnecessary. And when this constructs a three-dimensional intersection viaduct at an intersection, the necessity of the traffic regulation of the road which crosses can be eased.
[0039]
Specifically, when the intersection portion 14A is preliminarily installed, the intersection portion 14A is suspended and fixed to the girder 50, and the girder 50 is moved to move the intersection portion 14A. Therefore, it is only necessary to restrict the traffic on the intersecting road only when the girder 50 is extended or moved.
[0040]
In addition, in the present embodiment, the bridge surface of the main girder 14 installed between the rear spans S1 and S2 can be used for material transportation, so the installation yard can be reduced in size.
[0041]
Further, in the present embodiment, when the intersection portion 14A is preliminarily installed, the foundation work 16D and the pier located at the front end of the intersection span S4 are used simultaneously with the preliminary installation, using both girders 50. Since the construction of 12D is performed, the work efficiency of the erection work can be increased.
[0042]
FIG. 4 is a process diagram showing a construction method according to a modification of the embodiment.
[0043]
In this modified example, when the intersection portion 14A is preliminarily installed, as shown in FIG. 5A, the intersection portion 14A is located on both sides in the bridge axis direction, as shown in FIG. 22D and suspended on the girder 50 via a pair of front and rear traveling devices 68, and the traveling devices 68 are moved forward along the girder 50 as shown in FIGS. Thus, the intersection portion 14A is moved. At that time, at the position of the bridge pier 12C, a roller 70 is interposed between the intersection portion constituting portion 14A and the two girders 50, so that the movement of the intersection portion constituting portion 14A is performed smoothly. In addition, about the installation process other than this, it is the same as that of the installation method of the said embodiment.
[0044]
By adopting the erection method of this modification, it is only necessary to regulate the traffic on the intersecting road only when moving the intersection portion 14A.
[0045]
In addition, when the erection method of this modification is adopted, it is not necessary to move the girder 50 for erection of the intersection portion constituting portion 14A, so that the erection operation can be simplified correspondingly. Further, since the girder 50 does not move, it is possible to always keep the girder 50 in a three-point support state without extending the girder 50, thereby further simplifying the construction work. Can do.
[Brief description of the drawings]
FIG. 1 is a process diagram (No. 1) showing a construction method of a three-dimensional crossover viaduct according to an embodiment of the present invention.
FIG. 2 is a process diagram (part 2) showing the erection method of the embodiment.
FIG. 3 is a process diagram (part 3) showing the erection method of the embodiment.
FIG. 4 is a process diagram illustrating a construction method according to a modification of the embodiment.
DESCRIPTION OF SYMBOLS 10 Three-dimensional crossover viaduct 12,12A, 12B, 12C, 12D Pier 14 Main girder 14A Crossing part 16,16D Foundation 22 Precast segment 22A, 22B, 22C, 22D Leg head segment 32 Footing 34 Cast-in-place steel pipe concrete pile 38 Bearing work 50 Girder 52A, 52B, 52C Support work 54 Strut 56 Extruding device 58 Excavator 60 Portal crane 62 PC steel rod 64 Temporary strut 66, 70 Roller 68 Traveling device 102 Road 104 Intersection S1 First span S2 Second Span S3 3rd span S4 4th span (between intersections)

Claims (4)

In a method of constructing a three-dimensional intersection viaduct at an intersection,
Install girder on the main girder in the middle of erection,
Using this girder, the intersection portion of the main girder located between the intersection diameters across the intersection, together with the leg head segments located on both sides in the bridge axis direction of the intersection portion, the intersection diameter In a state where the plurality of precast segments and the both leg head segments constituting the intersection portion are connected and arranged in a span adjacent to the front side between the plurality of precast segments and the both leg head segments connected to each other. After preliminarily erection by performing joint work between each segment and inserting and tensioning PC steel ,
This intersection part is moved between the intersection diameters ,
Then, the installation method of the three-dimensional crossover viaduct characterized by performing the extension installation of the said main girder between the diameters adjacent to the near side between the said diameters of said cross | intersection part . When preliminarily laying the intersection part, the intersection part is suspended and fixed to the girder,
The construction method for a three-dimensional crossover viaduct according to claim 1, wherein the crossing portion is moved by moving the girder. When preliminarily laying the intersection part, the intersection part is suspended from the girder via a predetermined traveling device,
The construction method for a three-dimensional intersection viaduct according to claim 1, wherein the crossing portion is moved by moving the traveling device.   When preliminarily constructing the intersection part, the foundation work and the pier located at the front end between the intersection diameters are constructed simultaneously with the preliminary construction using the girder. The construction method of the three-dimensional intersection viaduct according to any one of claims 1 to 3.

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