JP2004308225A - Work method and overhead bypass road - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a work method for performing temporary work and regular work without performing large traffic regulation to a vehicle passing through an existing traffic road; and to propose an overhead bypass road for largely restraining the traffic regulation at temporary work in the work method using an overhead traffic road. <P>SOLUTION: After continuously arranging a plurality of bridge girders 11 and 21 in the air of a work section R3 arranged in the road R1, the bridge beam 21 is lowered, and communicated with the road R1. After automobiles S are bypassed on the plurality of bridge girders 11 and 21, the regular work is performed in the work section R3. After becoming passable through the work section R3, the lowered bridge girders 21 is lifted, and the automobiles S are passed through the work section R3. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a construction method and an elevated detour when performing construction on an existing traffic route.
[0002]
[Prior art]
When performing construction on existing traffic routes, such as when repairing existing traffic routes such as roads and railways, or when constructing underground structures under existing traffic routes, secure the space necessary for construction and In order to avoid traffic congestion due to the above, it is necessary to detour vehicles and the like passing through the construction section.
[0003]
However, in an urban area where buildings are densely located, it is very difficult to secure a site for a detour. As one of the measures to solve such problems, a temporary viaduct (hereinafter referred to as “elevated detour”) is built on the existing traffic route, and vehicles and the like are detoured to the elevated detour, A construction method for performing this construction is known (for example, see Patent Document 1).
[0004]
[Patent Document 1]
JP-A-5-247913 (FIG. 1)
[0005]
[Problems to be solved by the invention]
However, it often takes a long time to construct or dismantle an elevated detour. That is, traffic congestion and the like during the main construction can be greatly reduced by the elevated detour, but on the other hand, traffic congestion due to temporary construction occurs.
[0006]
In particular, while constructing or disassembling the approach section from the existing traffic route to the elevated section, vehicles cannot be allowed to pass under the approach section due to problems such as building limits, so it is necessary to greatly restrict traffic. Will be done.
[0007]
Accordingly, the present invention provides a construction method using an elevated traffic route, which is capable of performing a temporary construction and a main construction without implementing a significant traffic regulation on vehicles or the like passing through an existing traffic route. It is another object of the present invention to provide an elevated detour that can significantly suppress traffic regulation during temporary construction.
[0008]
[Means for Solving the Problems]
In order to solve such a problem, the invention described in claim 1 constructs an elevated detour on a construction section provided on an existing traffic route and diverts traffic on the elevated detour. Above, the main construction is performed in the construction section, and after the construction section is allowed to pass, a part or all of the elevated detour is raised to secure a building limit under the elevated detour. It is a construction method characterized by the following.
[0009]
According to this construction method, when carrying out construction on an existing traffic route where traffic of vehicles, people, etc. (hereinafter referred to as vehicles, etc.) goes, significant traffic regulations will be imposed on vehicles, etc. that pass through the existing traffic route. Without the need for this work. Then, when this construction progresses and the construction section is in a passable state, by raising a part or all of the elevated detour to secure the building limit under the elevated detour In addition, it becomes possible to immediately pass vehicles and the like through the construction section without waiting for dismantling of the elevated detour, and as a result, it is possible to significantly suppress traffic regulation accompanying dismantling work of the elevated detour.
[0010]
The invention described in claim 2 is a temporary construction step in which a part or all of a plurality of bridge girders are continuously installed above a construction section provided on an existing traffic route, and the plurality of bridge girders are installed and the existing bridge girders are installed. A bridge girder installation step of communicating with a traffic route and detouring traffic on the plurality of bridge girders, a main construction step of performing main construction work in the construction section, and the bridge girder installed after the construction section becomes traversable. And a bridge girder raising step for raising the bridge girder.
[0011]
Such a construction method includes, after a plurality of bridge girders are continuously installed above a construction section provided on an existing traffic route, installing the plurality of bridge girders and communicating with the existing traffic route, and providing a vehicle or the like on the plurality of bridge girders. After the detour, the main work is performed in the construction section, and after the construction section becomes traversable, the installed bridge girder is raised to allow vehicles and the like to pass through the construction section. According to the method, when construction is performed on an existing traffic route on which vehicles and the like go, temporary construction and main construction can be performed without significantly restricting traffic on vehicles and the like passing on the existing traffic route. That is, since all of the plurality of bridge girders constituting the elevated detour can be constructed above the construction section, vehicles and the like can pass under the elevated detour just before the service is started. If some or all of the bridge girders are installed at predetermined positions so as to function as an elevated detour, vehicles and the like can be immediately passed on the elevated detour (a plurality of bridge girders). Further, when the work is progressed and the construction section is in a passable state, if these are raised, vehicles and the like are immediately passed through the construction section without waiting for dismantling of the elevated detour. be able to.
[0012]
The invention described in claim 3 is the construction method according to claim 2, wherein the temporary construction step includes constructing a pair of left and right retaining walls on the existing traffic route, and the bridge girder installation step includes: And embedding the space between the retaining walls to rub the bridge girder against the existing traffic path, and the bridge girder raising step includes removing the embankment between the retaining walls.
[0013]
In this construction method, the bridge girder that has been lowered and the existing traffic route are rubbed by embankment between a pair of left and right retaining walls that have been constructed in the existing traffic route in advance. In this way, traffic regulations on vehicles and the like passing through existing traffic routes can be further reduced. The retaining wall may be cast-in-place or precast, and may be a gravity retaining wall, an L-shaped retaining wall, an inverted T retaining wall, or the like, or an underground continuous wall or a pier row pier. No problem. Also, this retaining wall may be used as a main body structure.
[0014]
The invention described in claim 4 is an elevated type detour for diverting traffic in a construction section provided on an existing traffic route, comprising an approach portion constructed above the construction section, and the approach concerned. The part is composed of a plurality of bridge girders continuously connected in the sky of the construction section, and the plurality of bridge girders are supported by piers constructed in the construction section so as to be able to move up and down.
[0015]
Such an elevated detour becomes a detour that bypasses the construction section when the approach section constructed over multiple spans is lowered over the construction section to communicate with the existing traffic path. That is, a vehicle or the like can be passed under the approach section until immediately before the service of the elevated detour starts, and the vehicle or the like can be immediately passed through the elevated detour if the entire approach section is lowered. . In addition, when the construction section progresses and the construction section is in a passable state, if the approach section is raised, vehicles and the like are allowed to pass through the construction section immediately without waiting for dismantling of the elevated detour. be able to. That is, in the case where construction is performed on an existing traffic route on which vehicles and the like travel, the temporary construction and the main construction can be performed without significantly restricting traffic on vehicles and the like passing on the existing traffic route. Note that the plurality of bridge girders constituting the approach portion may be connected continuously in a state of being inclined at a predetermined gradient, or may be connected horizontally. When a plurality of bridge girders are installed horizontally, each bridge girder is lowered while being inclined at a predetermined gradient, and is raised while returning to horizontal.
[0016]
The invention described in claim 5 is the elevated detour according to claim 4, wherein each of the bridge girders is supported at both ends thereof so as to be able to go up and down.
[0017]
According to such an elevated detour, since both ends of the bridge girder are supported so as to be able to move up and down, the inclination of the bridge girder can be adjusted. That is, when raising and lowering the bridge girder, the gradient of the bridge girder can be easily adjusted by making a difference between the lifting amount at one end and the lifting amount at the other end. For example, a bridge girder that is horizontally laid can be lowered while being inclined at a predetermined gradient.
[0018]
According to a sixth aspect of the present invention, there is provided the elevated detour according to the fifth aspect, wherein ends of the adjacent bridge girders are connected by a telescopic coupler.
[0019]
According to such an elevated detour, the distance between the ends of the adjacent bridge girders can be kept in an appropriate state by the coupler, so that the entire approach portion extending over multiple spans can be moved up and down in a lump.
[0020]
The invention described in claim 7 is the elevated detour according to any one of claims 4 to 6, wherein an elevating device is provided at an upper end of each pier, and each of the bridge girders is provided. Is suspended from the lifting device.
[0021]
According to the elevated detour, the bridge girder can be raised and lowered by appropriately operating the lifting device provided on the pier. That is, when raising and lowering the bridge girder, there is no need to prepare a special vehicle equipped with a wheel crane or jack.
[0022]
The invention described in claim 8 is the elevated detour according to any one of claims 4 to 7, wherein each of the piers supports the bridge girder in a lowered state. Is provided.
[0023]
According to such an elevated detour, since the support portion is provided in advance at a predetermined position of each pier, the positioning of the bridge girder at the time of descent becomes easy.
[0024]
The invention described in claim 9 is the elevated detour according to any one of claims 4 to 8, wherein the piers are arranged at predetermined intervals in a direction perpendicular to the bridge axis. It consists of a pair of left and right supports.
[0025]
According to this elevated detour, a pair of right and left pillars are used as piers. Therefore, when a general vehicle passes through a construction section (below the elevated detour), such as during the construction of the elevated detour, the pier is used. Traffic flow is not hindered.
[0026]
An elevated detour according to a tenth aspect further includes a sliding portion that allows the approach part and the existing traffic path to communicate with each other according to any one of the fourth to ninth aspects. The sliding portion includes a pair of left and right retaining walls arranged in the construction section.
[0027]
According to such an elevated detour, by embankment between the retaining walls, the approach portion and the existing traffic path can be easily rubbed. The retaining wall may be cast-in-place or precast, and may be a gravity retaining wall, an L-shaped retaining wall, an inverted T retaining wall, or the like, or an underground continuous wall or a pier row pier. No problem. Also, this retaining wall may be used as a main body structure.
[0028]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[0029]
In the construction method according to the present invention, as shown in FIG. 1, after constructing an elevated detour U above a construction section R3 provided on a road R1, a part of the elevated detour U is lowered. After communicating with the road R1 (see FIG. 6) and diverting the automobile S on the elevated detour U, the main construction is performed in the construction section R3. The lowered portion of the detour U is raised (see FIG. 8) to allow the vehicle S to pass through the construction section R3.
[0030]
In the present embodiment, as shown in FIGS. 10A and 10B, one of the roads R1 and R2 that intersect with each other is made underground, and a substantially rectangular section is provided in a construction section R3 provided on the road R1. An example of performing construction (main construction) for constructing a box culvert 70 having a shape and a digging structure 80 having a substantially U-shaped cross section will be exemplified. Needless to say, the type of construction and the type of construction work are not limited to these.
[0031]
[Elevated detour]
First, the elevated detour U will be described. As shown in FIG. 1, the elevated detour U includes an elevated section 10 and an approach section 20 constructed above the construction section R3, and a sliding section 30 constructed on the road R1. The approach portion 20 and the sliding portion 30 are arranged on both sides of the elevated portion 10 in the bridge axis direction.
[0032]
(Elevated section)
As shown in FIG. 1, the elevated portion 10 includes a plurality of bridge girders 11 (hereinafter, referred to as “fixed bridge girders 11”) that are continuously provided above the construction section R3. The installation height of the fixed bridge girder 11 does not change during the construction period.
[0033]
In this embodiment, the fixed bridge girder 11 has a long span spanning the intersection R4 and a short span girder arranged on both sides in the bridge axis direction. The long span fixed bridge girder 11 is erected between the first piers 40 and 40 facing each other across the intersection R4, and the short span fixed bridge girder 11 is provided between the first pier 40 and the second pier 50, or , Between the second pier 50 and the third pier 60. The structure type, material and the like of the fixed bridge girder 11 and its piers 40 and 50 are not particularly limited, and an appropriate one can be selected according to construction conditions and the like.
[0034]
In the present embodiment, the first pier 40 and the second pier 50 have substantially the same configuration, and therefore, the first pier 40 will be described below. As shown in FIG. 2A, the first pier 40 includes a pair of right and left columns 41, 41 arranged at predetermined intervals in a direction perpendicular to the bridge axis, and a horizontal member 41b connecting these columns.
[0035]
As shown in FIG. 1, the support column 41 is formed by integrally integrating a column array including a plurality of support piles 41 a arranged at predetermined intervals in a bridge axis direction with a plurality of cross members 41 c. As shown in FIG. 2A, the support pile 41a is driven into a support layer further below the floor surface of the box culvert 70.
[0036]
(Approach part)
As shown in FIG. 1, the approach section 20 includes a plurality (four in the present embodiment) of bridge girders 21 (hereinafter, referred to as “movable bridge girders 21”) that are connected substantially horizontally over the construction section R3. I have.
[0037]
As shown in FIG. 3, the movable bridge girder 21 is installed on third piers 60 adjacent to each other in the bridge axis direction so as to be able to move up and down. In this embodiment, as shown in FIG. 4, a pair of receiving girders 22, a pair of left and right truss frames 23, 23 laid between the receiving girders 22, 22 and the truss frames 23, 23 are connected to each other. It is composed of a plurality of cross beams 24 to be connected and a plurality of lining plates 25 provided on the cross beams 24. As shown in FIG. 5 (a), a pin shoe 23a and a movable shoe 23b which is vertically expandable and contractible are interposed between the truss frame 23 and the receiving girder 22 in the bridge axis direction. . Here, the pin shoe 23a may be configured to be changeable to a movable shoe during operation.
[0038]
As shown in FIG. 5C, in the present embodiment, the receiving girder 22 includes a beam 22A formed by connecting a pair of H steels 22a, 22a with a plurality of connecting members 22b, and an end of the beam 22A. , And a pin shoe 23a and a movable shoe 23b are fixed to both ends of the beam 22A. Further, as shown in FIG. 5 (b), hoists 22c, 22c are fixed to the guide portion 22B, and the hoisting devices 22c, 22c have lifting devices 62 provided at the upper end of the third pier 60. The lower end of the linear member 62a hanging down from (see FIG. 5A) is connected. That is, the movable bridge girder 21 is suspended by the lifting device 62 via the receiving girder 22.
[0039]
In addition, the structure type, the material, and the like of the movable bridge girder 21 are not limited to those shown in the drawings, and an appropriate one can be selected according to construction conditions, load conditions, and the like.
[0040]
As shown in FIG. 2 (b), the third pier 60 is composed of a pair of right and left columns 61, 61 arranged at predetermined intervals in the direction perpendicular to the bridge axis in the construction section R3. 21 is located above.
[0041]
As shown in FIG. 3, the support column 61 is formed by connecting the upper ends of a row of four column members 61a continuously provided at a predetermined interval in the bridge axis direction with a horizontal member 61d. In addition, as shown in FIG. 1, the column 61 ′ of the third pier 60 located at the boundary with the sliding portion 30 is composed of two column members 61 a.
[0042]
As shown in FIG. 3, the column member 61a is erected and fixed to a core member 91a constituting an underground continuous wall 91 (see FIG. 2B). In addition, the core material 91a shall penetrate to the support layer. Further, as shown in FIG. 2B, the column member 61a is provided with a temporary receiving portion 61c on which the receiving girder 22 of the movable bridge girder 21 in the raised state is placed, and a movable bridge girder 21 in the lowered state. And a supporting portion 61b on which the receiving beam 22 is placed. The temporary receiving part 61c is installed at a height below the movable bridge girder 21 so that a building limit can be secured when the movable bridge girder 21 is placed on the temporary receiving part 61c. Further, when the movable bridge girder 21 is supported by the temporary receiving portion 61c or the supporting portion 61b, as a result, a ramen structure is formed by the receiving girder 22 and the pair of left and right columns 61, 61 (column members 61a, 61a). Will be.
[0043]
Further, as shown in FIG. 5C, the interval between the adjacent column members 61 a in the bridge axis direction is larger than the guide portion 22 B of the girder 22. That is, the guide portion 22B can move up and down between the adjacent column members 61a.
[0044]
In a section where the underground continuous wall 91 (see FIG. 2B) is not constructed, the support pile 61e (see FIG. 1) is driven in, and the column member 61a is erected and fixed to the upper end of the support pile 61e.
[0045]
Further, as shown in FIG. 3, lifting devices 62, 62 are fixed to a horizontal member 61d connecting the upper ends of the four column members 61a.
[0046]
The elevating device 62 is located directly above the guide portion 22B of the receiving beam 22 (see FIG. 5C). That is, two lifting devices 62 are arranged for one receiving beam 22. A linear member 62a such as a wire or a steel rod hangs from the elevating device 62, and the lower end thereof is connected to the hanging tool 22c of the receiving beam 22 (see FIGS. 5A and 5B). When the four lifting devices 62 are appropriately operated, the movable bridge girder 21 moves up and down. Further, in one movable bridge girder 21, the lifting amount of one receiving girder 22 and the lifting amount of the other receiving girder 22 are reduced. If the difference is made, the movable bridge girder 21 will be inclined.
[0047]
Further, as shown in FIG. 5A, the receiving girders 22, 22 of the adjacent movable bridge girders 21, 21 are connected to each other by a telescopic coupler 26. For example, a jack can be used for the coupler 26.
[0048]
(Sliding part)
The sliding part 30 is provided between the approach part 20 and the road R1, as shown in FIG. 1, and as shown in FIG. 2C, a pair of left and right retaining walls arranged in the construction section R3. 31, 31 are provided. By embankment between the retaining walls 31 immediately before or immediately after the approach portion 20 is lowered, the approach portion 20 that has been lowered and the road R1 are rubbed.
[0049]
As shown in FIG. 2 (c), the retaining wall 31 is an inverted T type in this embodiment, and only the earth retaining portion 31a in the high section protrudes above the ground, and other portions are buried underground. . Finally, the space between the retaining walls 31 is dug down. Further, the structure type and the like of the retaining wall 31 are not limited to those shown in the drawings, and may be appropriately changed in accordance with construction conditions.
[0050]
[Construction method]
Next, a construction method using the elevated detour U will be described. In this construction method, as shown in FIG. 6, an elevated detour U is constructed on a construction section R3 provided on a road R1, and a vehicle S is detoured on the elevated detour U. After the main construction is performed in the section R and the construction section R3 becomes passable, a part or all of the elevated detour U is raised to secure a building limit under the elevated detour U ( See FIG. 8). That is, all of the plurality of bridge girders (the fixed bridge girder 11 and the movable bridge girder 21) constituting the elevated detour U are connected continuously above the construction section R3, and thereafter, these function as the elevated detour U. Thus, a part of the bridge girder (the movable bridge girder 21 of the approach portion 20) is installed at a predetermined position (to be lowered), communicates with the road R1, and the vehicle S is detoured on the plurality of bridge girder 11, 21. Above, the main construction is performed in the construction section R3, and after the construction section R3 becomes traversable, the movable bridge girder 21 that has been installed (dropped) is raised to secure the building limit under the elevated detour U. It is. Hereinafter, each step will be described in detail.
[0051]
(Temporary construction process)
First, as shown in FIGS. 2A and 2B, a retaining wall 90 serving as a retaining wall when constructing the box culvert 70 and the excavated structure 80 is constructed. The structure and form of the retaining wall 90 may be changed as appropriate in accordance with soil conditions and the like. The earth retaining wall 90 of the present embodiment includes an underground continuous wall 91 (see FIGS. 2A and 2B) constructed by a soil mixing wall (SMW) method, and a steel sheet pile 92 constructed by a steel sheet pile method. FIG. 2C). In the present embodiment, the underground continuous wall 91 is constructed in a section where the excavation depth is relatively large (see FIGS. 2A and 2B), and a steel sheet pile 92 is constructed in a section where the excavation depth is relatively shallow (see FIG. 2A). FIG. 2 (c)).
[0052]
Next, as shown in FIG. 1, a plurality of support piles 41a are driven at predetermined positions in the construction section R3 to construct the first pier 40, and a plurality of support piles 51a are driven to construct the second pier 50. . Further, in the section where the underground continuous wall 91 (see FIG. 2B) is constructed, the column member 61a is erected and fixed on the upper end of the core member 91a of the locally elongated underground continuous wall 91, In the section where the steel sheet pile 92 (see FIG. 2 (c)) is constructed, a plurality of support piles 61e are driven, and a column member 61a is erected and fixed to the upper end of the support pile. The third bridge pier 60 is constructed by connecting the upper ends of the column members 61a with the cross members 61d and fixing the lifting devices 62, 62 on the upper surface of the cross members 61d.
[0053]
Here, as shown in FIG. 2A, the first pier 40 is constituted by a pair of right and left columns 41, 41 erected at predetermined intervals in the direction perpendicular to the bridge axis. The vehicle S can be passed between 41 and 41, and the space can be used for a right turn lane or the like. That is, even if the first pier 40 is constructed, the flow of traffic is not obstructed. The same applies to the second pier 50 and the third pier 60.
[0054]
Subsequently, as shown in FIG. 1, the fixed bridge girder 11 and the movable bridge girder 21 are erected on the first pier 40, the second pier 50, and the third pier 60 to construct the elevated portion 10 and the approach portion 20. That is, a plurality of bridge girders 11 and 21 are continuously provided above the construction section R3 provided on the road R1 to construct the elevated section 10 and the approach section 20.
[0055]
The fixed bridge girder 11 and the movable bridge girder 21 can be erected using a heavy machine equipped with a crawler crane or a jack, but the movable bridge girder 21 uses a lifting device 62 provided at the upper end of the third pier 60. May be erected.
[0056]
At this time, the fixed bridge girder 11 is erected along the vertical line of the elevated detour U in the elevated portion 10, and the movable bridge girder 21 is erected horizontally at a height where the building limit can be secured in the approach portion 20. .
[0057]
Here, as shown in FIG. 2B, the movable bridge girder 21 is placed on the temporary receiving portion 61c provided on the support column 61. In such a state, the building limit is secured below the movable bridge girder 21. Therefore, the vehicle S can pass under the movable bridge girder 21.
[0058]
In addition, as shown in FIG. 2C, the vicinity of the boundary between the approach portion 20 and the sliding portion 30 (see FIG. 1) is dug down in advance to construct a retaining wall 31, and then backfilled to the ground surface again. Keep it.
[0059]
(Bridge girder installation process)
Next, as shown in FIG. 6, the movable bridge girder 21 of the approach portion 20 is lowered (inclined) in a lump among the plurality of bridge girders 11 and 21, and the retaining walls 31 and 31 (see FIG. 7C). The embankment is filled, the approach portion 20 is connected to the road R1, and the vehicle S is detoured on the elevated detour U (on the plurality of bridge girders 11, 21).
[0060]
That is, as shown in FIG. 3, after removing the temporary receiving portion 61c (see FIG. 2B) provided on the third pier 60, the separation distance between the adjacent movable bridge girders 21 and 21 is determined by the coupler 26. By operating the lifting / lowering device 62 provided on the third pier 60, the plurality of movable bridge girders 21 spanning multiple diameters are lowered (inclined) at a time while adjusting the distance. More specifically, while appropriately adjusting the separation distance between the adjacent movable bridge girders 21 and 21 so as to be within a predetermined range by the coupler 26, the end (receiving portion) of each movable bridge girder 21 on the sliding portion 30 side is adjusted. The descending speed of the girder 22) is made higher than the descending speed of the end (the receiving girder 22) on the elevated portion 10 side. At this time, since both ends of the receiving girder 22 are suspended, the movable bridge girder 21 can be lowered in a stable state.
[0061]
As shown in FIG. 7B, the third pier 60 is provided with a support portion 61b on which the receiving girder 22 of the movable bridge girder 21 in a lowered state is provided. Positioning is very easy. Moreover, as a result, a ramen structure is formed by the receiving girder 22 and the pair of left and right columns 61, 61 (column members 61a, 61a), so that it is excellent in mechanical properties.
[0062]
Further, since the movable bridge girder 21 is lowered by the elevating device 62 provided on the third pier 60, there is no need to prepare a special vehicle equipped with a wheel crane or jack.
[0063]
As shown in FIG. 7 (c), the approach portion 20 and the road R1 are filled between the earth retaining portions 31a, 31a of the railing portion of the retaining walls 31, 31 immediately before or immediately after the movable bridge girder 21 is lowered. It is rubbed by doing. Since the retaining wall 31 is a sill connected to the retaining wall at the sliding end of the excavated structure 80 as the main body structure, the installation work can be performed easily and inexpensively. That is, it is possible to facilitate and speed up the work, and as a result, it is possible to further reduce the traffic regulation on the automobile S passing on the road R1.
[0064]
(Main construction process)
Subsequently, main construction is performed in the construction section R3. In this embodiment, as shown in FIG. 7A, the columns 41, 41 of the first pier 40 are reinforced with cross members 41b while digging down between the underground continuous walls 91, 91 to a predetermined depth, and Build a box culvert 70 below 10. Further, as shown in FIG. 7B, a digging structure 80 is constructed by digging down to a predetermined depth below the approach portion 20 while installing a cutting beam 93 between the underground continuous walls 91, 91.
[0065]
At this time, the work space under the elevated detour U can be used as a work space, and work efficiency is high.
[0066]
Thereafter, as shown in FIG. 9A, a receiving beam 41d is provided on the upper surface of the box culvert 70, and after replacing the first pier 40 with the receiving beam 41d, the support pile 41a penetrating through the inside of the box culvert 70 is provided. And the cross member 41b (see FIG. 7 (a)) is removed so that the car S can pass through the inside of the box culvert 70, and similarly, as shown in FIG. A certain beam 93 or the like (see FIG. 7B) is removed, and the inside of the digging structure 80 is set in a state where the automobile S can pass. That is, a state is established in which the vehicle can pass through the construction section R3.
[0067]
(Bridge girder elevating process)
When the construction section R3 becomes passable, the lowered movable bridge girder 21 is raised as shown in FIG. 8, and as shown in FIG. The embankment between 31a is removed, and the retaining wall 31, 31 is dug down to allow the vehicle S to pass through the construction section R3.
[0068]
In order to raise the movable bridge girder 21, the lifting device 62 provided on the third pier 60 is appropriately operated while adjusting the distance between the adjacent movable bridge girder 21 and 21 with the coupler 26 (see FIG. 3). What is necessary is just to move each movable bridge girder 21 upward while returning it horizontally.
[0069]
Thereafter, as shown in FIG. 10 (a), when the elevated detour U is removed, the intersection R4 is completed at the intersection (underground road R1).
[0070]
As described above, according to the construction method according to the present embodiment, when the construction is performed on the road R1 on which the car S travels, the temporary construction and the construction work can be performed without significantly restricting the traffic on the car S passing on the road R1. Can perform construction.
[0071]
That is, according to this construction method, as shown in FIG. 1, all of the plurality of bridge girders 11 and 21 constituting the elevated detour U for bypassing the construction section R3 are constructed above the construction section R3. As shown in FIGS. 2A and 2B, the vehicle S can pass under the elevated portion 10 and the approach portion 20 until immediately before the service of the elevated detour U is started. Then, as shown in FIG. 7 (b), when the movable bridge girder 21 is lowered, the vehicle or the like can immediately pass through the elevated detour U, and furthermore, when the construction is progressing, the construction section R3 (FIG. 8) 9 (a), 9 (b) and 9 (c), immediately after the elevated detour U is dismantled without waiting for disassembly, as shown in FIGS. The vehicle S can be passed through R3. In other words, even if the width of the road R1 on which the construction is performed is narrow and it is difficult to secure a sufficient traffic volume with a planar detour, it is necessary to construct the elevated detour U in the construction section R3. Thus, it is possible to secure necessary lanes over the whole section of the construction section R3, and as a result, it is possible to significantly suppress traffic congestion due to construction.
[0072]
Also, since a sufficient work space can be secured for the builder, work efficiency can be improved, and as a result, it is possible to shorten the construction period and reduce the construction cost.
[0073]
Note that, in the above-described embodiment, the case where all of the plurality of movable bridge girders 21 are horizontally connected at the same height is exemplified. However, the present invention is not limited to this. They may be provided continuously in a state of being inclined at a predetermined gradient. In this case, since it is not necessary to change the elevating speed at each movable bridge girder, construction management is facilitated.
[0074]
In the above-described embodiment, the coupler 26 is disposed between the adjacent movable bridge girders 21 and 21, but the coupler 26 may be omitted. In this case, although not shown, each of the plurality of movable bridge girders can be independently raised and lowered.
[0075]
In the above-described embodiment, only the approach section 20 of the elevated detour U is configured to be able to move up and down. However, the elevated section 10 may be configured to be able to move up and down. For example, in the case where the construction is to improve the level of the railway rails due to raising the river embankment, and when the construction is completed, if the building limit cannot be secured below the entire elevated detour U, By raising not only the approach section 20 but also the elevated section 10 to secure the building limit under the elevated detour U, vehicles and the like can immediately pass through the construction section without waiting for the demolition of the elevated detour U. As a result, traffic regulation accompanying the dismantling work of the elevated detour U can be greatly suppressed.
[0076]
In the above-described embodiment, not only the elevated section 10 but also the approach section 20 is constructed above the construction section R3, and the approach section 20 is lowered immediately before the vehicle S is detoured on the elevated detour U. Although the construction method has been exemplified, the invention is not limited thereto. For example, in the elevated detour U, only the elevated portion 10 is constructed above the construction section R3, and the vehicle is placed on the elevated detour U. Immediately before detouring S, the movable bridge girder 21 constituting the approach portion 20 may be erected at a predetermined gradient by rapid construction, and the road R1 and the elevated portion 10 may be communicated. That is, of a plurality of bridge girders (fixed bridge girder 11 and movable bridge girder 21) constituting the elevated detour U, a part of the bridge girder (fixed bridge girder 11 of the elevated portion 10) is continuously provided above the construction section R3. After that, the remaining bridge girder (the movable bridge girder 21 of the approach portion 20) may be installed at a predetermined position by rapid construction to communicate with the road R1, and the vehicle S may be detoured on the plurality of bridge girder 11, 21. .
[0077]
In addition, as shown in FIG. 11, when the underground structures 100 and 110 are installed side by side, an elevated detour U ′ is constructed above the underground structure 100, and the underground structure is constructed by the above-described construction method. After constructing the underground structure 100, the elevated detour U ′ may be relocated above the underground structure 110, and the underground structure 110 may be constructed in the same manner as described above. The underground structures 100 and 110 may be constructed at the same time, and the elevated detours U 'and U' may be provided together.
[0078]
In the above, the elevated detour and the construction method according to the present invention have been described in detail by taking the case where the road R1 is underground as an example. However, it is needless to say that the elevated detour and the construction method can be applied to other construction performed on an existing traffic route. For example, although detailed explanations are omitted, various works such as widening, repairing, and rehabilitation work on existing roads, replacing old bridges and viaducts, and continuously elevating railways In addition, the elevated detour and the construction method according to the present invention can be applied.
[0079]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to the construction method concerning this invention, temporary construction and main construction can be performed, without implementing a large traffic regulation with respect to the vehicle etc. which pass through an existing traffic route.
[0080]
Further, according to the elevated detour according to the present invention, traffic regulation during temporary construction and main construction can be significantly suppressed. Furthermore, a large work space can be secured for the builder, so that the construction period can be shortened and the construction cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a side view showing a construction method and an elevated detour according to the present invention.
2A is a cross-sectional view taken along line X1-X1 in FIG. 1, FIG. 2B is a cross-sectional view taken along X2-X2 in FIG. 1, and FIG. 2C is a cross-sectional view taken along X3-X3 in FIG.
FIG. 3 is an enlarged side view showing a bridge girder of an approach portion.
FIG. 4 is an enlarged top view showing a bridge girder of an approach portion.
5A is an enlarged side view showing an end of a bridge girder, FIG. 5B is an end view showing a bridge girder of an approach part, and is a view taken in the direction of arrows Y1-Y1 in FIG. 4, and FIG. FIG. 3 is a view taken along arrow Z1-Z1 of FIG.
FIG. 6 is a side view for explaining the construction method according to the present invention, showing a step following FIG. 1;
7A is a sectional view taken along line X1-X1 of FIG. 6, FIG. 7B is a sectional view taken along line X2-X2 of FIG. 6, and FIG. 7C is a sectional view taken along line X3-X3 of FIG.
FIG. 8 is a side view for explaining the construction method according to the present invention, showing a step following FIG. 6;
9A is a sectional view taken along line X1-X1 of FIG. 8, FIG. 9B is a sectional view taken along line X2-X2 of FIG. 8, and FIG. 9C is a sectional view taken along line X3-X3 of FIG.
10A is a side view for explaining the construction method according to the present invention, showing a step following FIG. 8, and FIG. 10B is a top view of FIG.
FIG. 11 is a cross-sectional view showing a modified example of the elevated detour according to the present invention.
[Explanation of symbols]
10 elevated section
11 Fixed bridge girder
20 Approach Department
21 movable bridge girder
22 Receiving digits
26 coupler
30 Sliding part
31 Retaining Wall
31a Dome
40 First Pier
50 Second Pier
60 Third Pier
61 prop
61a pillar
61b support
61c Temporary receiving section
62 Lifting device
70 box culvert
80 Drilling structure
90 Earth retaining wall
R1, R2 road
R3 construction section
R4 intersection
S car
U elevated detour

Claims (10)

After constructing an elevated detour on the construction section provided on the existing traffic route, detouring the traffic on the elevated detour, performing the main work in the construction section, and the construction section becomes traversable After that, a part or all of the elevated detour is raised to secure a building limit under the elevated detour. A temporary construction process in which a part or all of a plurality of bridge girders are continuously installed above the construction section provided on the existing traffic route;
A bridge girder installation step of installing the plurality of bridge girders, communicating with the existing traffic path, and bypassing traffic on the plurality of bridge girders;
A main construction process for performing the main construction in the construction section,
A bridge girder raising step of raising the installed bridge girder after the construction section has become traversable. The temporary construction process includes constructing a pair of left and right retaining walls on the existing traffic route,
The bridge girder installation step includes embankment between the retaining walls and rubbing the bridge girder with the existing traffic path,
The construction method according to claim 2, wherein the bridge girder raising step includes removing an embankment between the retaining walls. An elevated detour for diverting traffic in a construction section provided on an existing traffic route,
It has an approach section built above the construction section,
The approach section is composed of a plurality of bridge girders continuously arranged above the construction section,
The elevated detour, wherein the plurality of bridge girders are supported by piers constructed in the construction section so as to be able to move up and down. The elevated detour according to claim 4, wherein each of the bridge girders is supported at both ends thereof so as to be able to move up and down. The elevated detour according to claim 5, wherein the ends of the adjacent bridge girders are connected by a telescopic coupler. The upper end of each pier is located above each of the bridge girders,
The elevated detour according to any one of claims 4 to 6, wherein each of the bridge girders is suspended by an elevating device provided at an upper end of each of the piers. The elevated detour according to any one of claims 4 to 7, wherein each of the piers is provided with a support portion that supports the bridge girder in a lowered state. The elevated detour according to any one of claims 4 to 8, wherein each of the piers comprises a pair of right and left columns arranged at predetermined intervals in a direction perpendicular to the bridge axis. Further comprising a sliding portion for communicating the approach portion and the existing traffic route,
The elevated detour according to any one of claims 4 to 9, wherein the sliding portion includes a pair of left and right retaining walls disposed in the construction section.

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