JP7409952B2 - Viaduct construction method and viaduct construction equipment - Google Patents

Description

The present invention relates to a viaduct construction method and viaduct construction apparatus applied to the construction of viaducts.

When constructing a viaduct, materials and equipment are brought in using a crane from a location adjacent to the construction site. However, if the land adjacent to the construction site is narrow and it is difficult to secure land for a crane, or if there are high-voltage power lines placed above the site and it is difficult to transport materials and equipment from the adjacent land using a crane, it is necessary to After constructing the piers, it was necessary to install scaffolding across the entire site below the viaduct in order to construct the bridge girders and slabs. Patent Document 1 describes a method for constructing a viaduct when the land adjacent to the construction site is narrow.

According to the technology described in Patent Document 1, after constructing a plurality of piers and a pair of bridge girders of a viaduct, a pair of rails is laid on the top surface of the pair of bridge girders, and a movable crane device is installed on the pair of rails. It is installed. Thereafter, a crane device is used to place the precast deck slabs on a pair of bridge girders, and concrete is poured on top of the precast deck slabs to form a floor surface, thereby constructing a viaduct.

Japanese Patent Application Publication No. 2009-191458

According to the technology described in Patent Document 1, a crane device is installed on a rail installed on a bridge girder, thereby reducing the construction site. However, a large number of reinforcing bars that serve as joints for joining with the precast deck slab are exposed on the bridge girder, and rails may not be installed directly on the bridge girder.

An object of the present invention is to provide a viaduct construction method that can shorten the construction period and reduce the amount of construction land even when there are restrictions on the installation target.

In order to achieve the above object, the present invention is a viaduct construction method applied to the construction of a viaduct, which is supported by a plurality of piers and is mounted on a pair of bridge girders facing each other along the axial direction of the viaduct. a step of installing a plurality of cross beams on top of the plurality of cross beams so as to bridge the pair of bridge girders, and a step of installing a plurality of cross beams on the plurality of cross beams in the bridge axis direction of the viaduct. the step of installing a pair of rail beams facing each other along the rail beam, the step of providing a pair of rails on the pair of rail beams, and the step of mounting a movable crane device on the pair of rails , The frame includes a main body formed in an H cross section when viewed from above, an upper plate provided at the upper end of the main body, a lower plate provided at the lower end of the main body, and a lower plate provided at the lower end of the main body. This is a viaduct construction method that is characterized by the addition of reinforcing plates .

According to the present invention, since the crane device is installed on a pair of existing bridge girders via a plurality of frames, a plurality of cross beams, a pair of rail beams, and a pair of rails, there is no need to set up scaffolding, and the construction site is saved. It can be significantly reduced. Further, even if a large number of reinforcing bars are exposed on the bridge girder, the rail beam and rail can be mounted via the frame and the cross beam, and the crane device can be mounted.

Further, the present invention provides a method for forming a predetermined number of precasts for forming a floor surface in an area on the pair of bridge girders where the trestle, the cross beam, the rail beam, and the rail are not installed by the crane device. It may be configured to include a step of placing a floor slab.

According to the present invention, since the precast deck slab can be placed on the bridge girder using a crane device placed on the existing bridge girder, the construction site can be reduced and the construction period can be significantly reduced.

The present invention also provides a step of moving the crane device on the rail in a direction opposite to the area where the precast deck is placed, and moving the rail from an area adjacent to the area where the precast deck is placed. forming an installation area in which a predetermined number of other precast floor slabs are installed by removing the rail beam, the cross beam, and the pedestal; and placing a plurality of precast floor slabs in the installation area. It may be configured to include a step of placing.

According to the present invention, the installation of a plurality of precast deck slabs is completed by installing a predetermined number of precast deck slabs in the installation area formed by removing the rails, rail beams, cross beams, and frames from the bridge girder. By this time, most of the crane equipment had been removed, making it possible to significantly shorten the construction period.

Moreover, the present invention integrates the plurality of precast deck slabs placed on the pair of bridge girders and the pair of bridge girders with concrete, and also provides a floor by pouring concrete onto the precast deck slab. The method may be configured to include a step of forming a surface.

According to the present invention, the formation of the floor surface and the integration of the precast deck slab, piers, and bridge girders can be performed simultaneously, and the construction period can be significantly shortened.

Further, the present invention includes a transport trolley that runs on the pair of rails, and the transport trolley reciprocates between a temporary storage location for the precast floor slab and a vicinity of the crane device to move the precast floor slab. The method may be configured to include a step of transporting the plate.

According to the present invention, there is no need for the crane device to be moved to a temporary storage location, and the precast deck can be transported using a transportation trolley while the crane device is in operation, thereby shortening the construction period.

In order to achieve the above object, the present invention is a viaduct construction device applied to the construction of a viaduct, which is supported by a plurality of piers and is mounted on a pair of bridge girders facing each other along the axial direction of the viaduct. a plurality of trestles installed at the top of the trestles, a plurality of cross beams installed at the top of the plurality of trestles so as to bridge the pair of bridge girders, and a plurality of cross beams installed along the bridge axis direction of the viaduct on the plurality of cross beams. The mount includes a pair of rail beams installed opposite to each other, a pair of rails installed on the pair of rail beams, and a crane device movably mounted on the pair of rails, A main body formed in an H cross section when viewed from above, an upper plate provided at the upper end of the main body, a lower plate provided at the lower end of the main body, and a reinforcing plate provided at the main body. This is a viaduct construction device characterized by comprising :

According to the present invention, since the crane device is mounted on a pair of existing bridge girders via a plurality of frames, a plurality of cross beams, a pair of rail beams, and a pair of rails, there is no need to set up scaffolding, and the construction site is can be significantly reduced. Further, even if a large number of reinforcing bars are exposed on the bridge girder, the rail beam and rail can be mounted via the frame and the cross beam, and the crane device can be mounted.

According to the present invention, even when there are restrictions on the installation target, the construction period can be shortened and the construction site can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the structure of the viaduct which is a construction target based on embodiment of this invention. It is a figure showing the composition of the bridge pier and the bridge girder of a viaduct. It is a front view showing the composition of a viaduct construction device. It is a side view showing the composition of a viaduct construction device. FIG. 3 is an exploded perspective view showing the configuration of the pedestal. It is a figure showing the composition of a precast floor slab. It is a figure showing the process of a viaduct construction method. It is a figure showing the process of a viaduct construction method. It is a figure showing the process of a viaduct construction method. It is a figure showing the process of a viaduct construction method. It is a figure showing the process of a viaduct construction method. It is a figure showing the process of a viaduct construction method. It is a figure showing the process of a viaduct construction method. It is a figure showing the process of a viaduct construction method.

Hereinafter, embodiments of the viaduct construction method according to the present invention will be described with reference to the drawings.

The viaduct construction method uses a plurality of constructed piers and bridge girders to install precast deck slabs, thereby reducing the construction site and construction period. A viaduct is an elevated structure constructed in the construction of railways and roads.

As shown in FIG. 1, a viaduct 1 constructed by applying the viaduct construction method has a gate-shaped rigid frame structure. The viaduct 1 includes a plurality of piers 10, a pair of bridge girders 20 supported by the plurality of piers 10, and a floor surface 30 (slab) formed on the pair of bridge girders 20. The piers 10, the bridge girders 20, and the floor surface 30 are constructed by combining precast slabs, which will be described later, formed by precasting.

The piers 10 of the viaduct 1 are formed into reinforced concrete columns with a rectangular cross section. The pier 10 is constructed by pouring concrete. The pier 10 may be constructed by combining precast members. In the bridge pier 10, reinforcing bars (not shown) are exposed at the joint portions at the upper and lower parts. The pier 10 may be formed with holes (not shown) into which reinforcing bars are inserted. Whether either reinforcing bars or holes are formed is determined by design. The joint portion of the pier 10 is fixed to other members or objects to be fixed when slab concrete is placed.

The pier 10 is fixed at a predetermined construction position. The plurality of piers 10 are arranged in parallel in the longitudinal bridge axis direction of the viaduct 1 (the y-axis direction in the figure). A pair of piers 10 are arranged facing each other in the width direction of the viaduct 1 (the x-axis direction in the figure). The width of the viaduct 1 is set according to the intended number of tracks, lanes, etc. Therefore, two or more piers 10 may be arranged in the width direction of the viaduct 1 depending on the width. A bridge girder 20 is constructed from cast-in-place concrete on the top of the bridge pier 10. The bridge girder 20 may be constructed by combining precast members. The bridge girder 20 is constructed to bridge the upper parts of the plurality of bridge piers 10 in the bridge axis direction. The pair of bridge girders 20 are arranged to face each other in the width direction of the viaduct 1.

A floor surface 30 is formed on the upper part of the pair of bridge girders 20. The floor surface 30 is formed into a flat plate-like body. The floor surface 30 is formed by combining a plurality of precast floor slabs formed in advance by precasting as described below.

Next, a method for constructing the viaduct 1 will be explained.

As shown in FIG. 2, the viaduct construction method is applied to a process of forming a floor surface 30 from a state in which a plurality of piers 10 and bridge girders 20 are constructed. A large number of reinforcing bars 21 serving as joints are exposed on the upper surface of the bridge girder 20. Due to the presence of the reinforcing bars 21, a rail for mounting a crane device cannot be installed on the upper surface of the bridge girder 20. Therefore, in the viaduct construction method, a crane device is indirectly placed on the upper surface of the bridge girder 20.

As shown in FIGS. 3 to 5, the viaduct construction apparatus 100 applied to the viaduct construction method includes a plurality of trestles 22 installed on the upper surface of the bridge girder 20, and a plurality of cross sections installed on the plurality of trestles 22. A beam 40, a pair of rail beams 50 installed on the plurality of cross beams 40, a pair of rails R installed on the pair of rail beams 50, and a crane device 60 placed on the pair of rails R. and.

The plurality of frames 22 are fixed to the upper surface of the bridge girder 20 along the longitudinal direction (y-axis direction) of the bridge girder 20. The frame 22 is fixed between a large number of reinforcing bars 21 for joints provided on the upper surface of the bridge girder 20. The pair of pedestals 22 are arranged to face the upper surface of the bridge girder 20 in the width direction of the viaduct 1. A plurality of pairs of frames 22 are arranged on the upper surface of the bridge girder 20 along the bridge axis direction (y-axis direction). The frame 22 is formed by processing H steel, for example.

The frame 22 includes a main body 23 formed in an H cross section when viewed from above, an upper plate 24 provided at the upper end of the main body 23 , a lower plate 25 provided at the lower end of the main body 23 , and the main body 23 The reinforcing plates 26 and 27 are provided. The main body portion 23 includes a beam portion 23A formed in a rectangular plate shape. A pair of flange parts 23B and 23C are provided at both ends of the beam part 23A. The pair of flange portions 23B and 23C are arranged perpendicularly to the beam portion 23A in plan view. The pair of flange portions 23B and 23C are formed into rectangular plate-like bodies.

The upper plate 24 and the lower plate 25 are formed into rectangular plate-like bodies. A plurality of (for example, four) through holes 24H are formed in the upper plate 24 for fixing to the cross beam 40 with bolts. A plurality of (for example, four) through holes 25H for anchor bolts are formed in the lower plate 25. The pedestal 22 is fixed to the upper surface of the bridge girder 20 with a plurality of anchor bolts.

A cross beam 40 is fixed to the upper part of a pair of frames 22 that face each other in the width direction of the viaduct 1 . The transverse beam 40 and the frame 22 are fixed with bolts and nuts. The transverse beam 40 is formed of, for example, one H steel. The cross beam 40 may be configured by connecting a plurality of members 41. For example, the ends of the members 41 may be connected to each other using bolts and nuts via a joint plate (not shown) or the like.

The plurality of cross beams 40 are arranged with their longitudinal directions substantially orthogonal to the bridge girder 20. A pair of rail beams 50 are fixed to the upper portions of the plurality of cross beams 40 so as to face each other. The rail beam 50 is arranged along the bridge axis direction of the viaduct 1 on the upper surface of the cross beam 40. That is, the rail beam 50 is arranged substantially perpendicular to the cross beam 40.

The rail beam 50 is configured by connecting a plurality of members 51 made of, for example, H steel. For example, the ends of the members 51 are connected to each other using bolts and nuts via a joint plate 53 or the like. The connecting position of the rail beam 50 is directly above the cross beam 40. In the x-axis direction, the center position between the pair of rail beams 50 does not necessarily have to coincide with the center position between the pair of piers 10 as long as it can be balanced with the center of gravity of the crane device 60 during operation. .

A rail R is fixed to the upper surface of the rail beam 50 along the longitudinal direction of the rail beam 50. The rail R is formed into a rod-shaped body made of steel. The rail R is fixed to the rail beam 50 using bolts, nuts, etc. The rail R is divided, for example, according to the length of the member 51 in the longitudinal direction. A pair of rails R are each fixed to a pair of rail beams 50. A crane device 60 is mounted on the pair of rails R via a plurality of wheels 62.

The crane device 60 includes a crane pedestal 61 that is a traveling body. The crane pedestal 61 is formed into a board shape using members such as a steel frame and iron plates arranged in a lattice shape. The crane pedestal 61 is movably supported by a plurality of wheels 62 on the rail R. A drive device 63 for driving the wheels 62 is provided in some of the plurality of wheels 62 . The drive device 63 allows the crane pedestal 61 to accelerate and decelerate and move forward and backward along the rail R. A crane 65 is provided on the crane pedestal 61 for lifting a moving object.

The crane 65 is rotatably provided on the crane pedestal 61. The crane 65 includes an arm 66 and a hook 67 suspended from the tip of the arm 66. The crane 65 adjusts the position and rotation of the crane pedestal 61, the inclination angle of the arm 66, and the lifting height of the hook 67, lifts the precast floor slab, and transports it to the installation position.

As shown in FIG. 6, the precast deck slab 31 is a member made of reinforced concrete for constructing the floor surface 30 of the viaduct 1. The precast floor slab 31 includes a floor slab section 32 for forming a floor surface, and a wall balustrade section 33 for forming a fence. The floor slab portion 32 is formed into a horizontal flat plate shape. The wall railing section 33 is formed in a plate shape that stands upward from both ends of the floor slab section 32.

A joint portion 32A that is joined to the bridge girder 20 is formed in the floor slab portion 32. A plurality of reinforcing bars 32B arranged in parallel in the y-axis direction are exposed in the joint portion 32A. When the precast deck slab 31 is placed on the bridge girder 20, the plurality of reinforcing bars 32B are arranged alternately with the many reinforcing bars 21 of the bridge girder 20. After the precast deck slab 31 is placed on the bridge girder 20, the joint portion 32A is filled with concrete C. When the concrete C hardens, the concrete, the plurality of reinforcing bars 32B, and the many reinforcing bars 21 of the bridge girder 20 are fixed, and the precast deck slab 31 and the bridge girder 20 are integrated.

A large number of loop-shaped reinforcing bars Z for joints are provided protruding from one end surface 32C of the floor slab portion 32. A large number of reinforcing bars Z are similarly provided protruding from the other end surface opposite to the one end surface 32C. When a plurality of precast deck slabs 31 are placed adjacent to each other on the bridge girder 20, the many reinforcing bars Z on one end surface 32C and the many reinforcing bars on the other end surface are arranged alternately.

After the precast deck slab 31 is placed on the bridge girder 20, concrete is filled between the one end surface 32C and the other end surface on the opposite side. When the mortar hardens, the concrete and a large number of reinforcing bars Z adhere to each other, and the plurality of precast floor slabs 31 are integrated.

On the upper surface 32E of the floor slab portion 32, a large number of reinforcing bars 32F for joints formed in a mountain shape are integrated with concrete, and a plurality of loops protrude. When a plurality of precast deck slabs 31 are placed on the bridge girder 20 and the upper surface 32E of the deck section 32 is filled with concrete C, the floor surface 30 is formed.

Concrete C is cast after the plurality of precast deck slabs 31 are placed on the bridge girder 20, and after the concrete C hardens, the plurality of precast deck slabs 31 and the plurality of precast deck slabs 31 and the bridge girder 20 are placed. At the same time, the floor surface 30 is formed.

Next, each step of the viaduct construction method will be explained.

As shown in FIG. 7, a plurality of piers 10 are constructed using cast-in-place concrete at the construction location of the viaduct 1. Thereafter, a pair of bridge girders 20 are constructed with cast-in-place concrete on top of the plurality of bridge piers 10, facing each other. In the figure, reinforcing bars 21 on the bridge girder 20 are omitted for simplicity.

As shown in FIG. 8, a plurality of frames 22 are installed above the pair of bridge girders 20 along the longitudinal direction of the bridge girders 20. At this time, the pair of frames 22 are installed to face each other in the width direction (x-axis direction) of the viaduct 1. At this time, an installation area Q is left where the precast floor slab 31 is installed, and a plurality of frames 22 are installed. Next, a plurality of cross beams 40 are installed to bridge the pair of frames 22. Thereafter, a pair of rail beams 50 are installed on top of the plurality of cross beams 40 to face each other along the bridge axis direction (y-axis direction). Thereafter, a pair of rails R are installed above the pair of rail beams 50. Thereafter, the crane device 60 and the transportation trolley 70 are placed on top of the pair of rails R. The crane device 60 and the transportation trolley 70 are mounted, for example, from the ground surface E by a rough terrain crane (not shown) or the like.

As shown in FIG. 9, a predetermined number of precast floor slabs 31 are placed adjacent to each other in the installation area Q using a crane device 60. At this time, the adjacent precast deck slabs 31 are positioned so that the numerous loop-shaped reinforcing bars Z on one end surface 32C (see FIG. 6) and the numerous loop-shaped reinforcing bars Z on the other end surface overlap in the bridge axis direction. It will be placed. The precast floor slab 31 is placed on the transportation trolley 70 by, for example, a rough terrain crane or the like from a temporary storage area (not shown) that is accumulated in one place.

The transportation trolley 70 travels on the rail R and transports the precast floor slab 31 to the vicinity of the crane device 60. The precast floor slab 31 is lifted from the transportation trolley 70 by the crane device 60 and transported to the installation area Q. The transportation trolley 70 transports the precast floor slab 31 by traveling back and forth between the temporary storage location and the vicinity of the crane device 60. As a result, the crane device 60 does not need to be moved to the vicinity of the temporary storage location, and the precast floor slab 31 can be transported by the transportation trolley 70 while the crane device 60 is in operation, reducing the construction period. .

As shown in FIG. 10, after a predetermined number of precast floor slabs 31 are installed in the installation area Q, the crane device 60 is moved in the opposite direction to the position where the precast floor slabs 31 are installed.

As shown in FIG. 11, after moving the crane device 60, a predetermined number of frames 22, a predetermined number of cross beams 40, and a predetermined number of rail beams 50 are moved from the area adjacent to the position where the precast floor slab 31 is installed. 51 and a predetermined number of rails R are removed. As a result, a new installation area Q is formed on the pair of bridge girders 20.

As shown in FIG. 12, a predetermined number of precast floor slabs 31 are placed adjacent to each other in the new installation area Q. After a predetermined number of precast floor slabs 31 are placed in the new installation area Q, the above steps are repeated. Finally, after the viaduct construction device 100 is removed, a predetermined number of precast deck slabs 31 are placed adjacent to the area using a rough terrain crane (not shown) or the like.

As shown in FIG. 13, a plurality of precast deck slabs 31 are placed adjacent to each other on a pair of bridge girders 20. After that, slab reinforcement (not shown) is arranged on the plurality of precast floor slabs 31. Formwork is attached to the outside of the plurality of precast floor slabs 31 (outside of the wall balustrade 33: see FIG. 6).

As shown in FIG. 14, concrete C is placed between the plurality of precast floor slabs 31, on the joint part 32A (see FIG. 6), and on the upper surface of the floor slab part 32, and after the concrete C hardens, the plurality of precast floor slabs The plate 31 and the pair of bridge girders 20 are integrated, the formwork is removed, and the viaduct 1 is constructed. The precast floor slab 31 may be formed by precasting the portion up to the floor surface 30, or may be formed by pouring concrete into the joint portion 32A (see FIG. 6).

As described above, according to the viaduct construction method, the crane device 60 is placed on the bridge girder 20 constructed in advance, and the precast deck slab 31 can be installed on the bridge girder 20 using the crane device 60, so the construction period for the viaduct 1 can be shortened. It can be significantly shortened. According to the viaduct construction method, since the crane device 60 can be placed on the bridge girder 20 for work, there is no need for scaffolding to cover the construction position of the viaduct 1, and the amount of construction land can be significantly reduced.

According to the viaduct construction method, materials can be transported and worked in the space under the plurality of cross beams 40 bridged on a pair of bridge girders 20, so that construction land can be significantly reduced. According to the viaduct construction method, even if a large number of reinforcing bars 21 for fixing the precast deck slab 31 on the bridge girder 20 are exposed, the crane device 60 can be installed.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described one embodiment, and can be modified as appropriate without departing from the spirit thereof. For example, the viaduct construction method is not only applicable to forming a single-level floor surface, but may also be applied to constructing a viaduct with two or more levels.

1 Viaduct, 10 Pier, 20 Bridge girder, 21 Rebar, 22 Frame, 23 Main body, 23A Beam, 23B Flange, 23C Flange, 24 Upper plate, 24H Through hole, 25 Lower plate, 25H Through hole, 26 Reinforcement plate , 27 reinforcing plate, 30 floor surface, 31 precast floor slab, 32 floor slab section, 32A joint section, 32B reinforcing bar, 32C one end surface, 32E top surface, 32F reinforcing bar, 33 wall parapet, 40 cross beam, 41 member, 50 rail Beam, 51 Member, 53 Joint plate, 60 Crane device, 61 Crane pedestal, 62 Wheel, 63 Drive device, 65 Crane, 66 Arm, 67 Hook, 70 Transport trolley, 100 Elevated bridge construction device, C Concrete, E Ground surface, Q installation area, R rail, Z reinforcing bar

Claims (6)

A viaduct construction method applied to the construction of viaducts,
installing a plurality of pedestals on a pair of bridge girders supported by a plurality of piers and facing each other along the axial direction of the viaduct;
installing a plurality of cross beams on top of the plurality of frames so as to bridge the pair of bridge girders;
installing a pair of rail beams facing each other along the bridge axis direction of the viaduct on the plurality of cross beams;
providing a pair of rails on the pair of rail beams;
placing a movable crane device on the pair of rails ,
The pedestal is
A main body formed in an H cross section when viewed from above;
an upper plate provided at the upper end of the main body;
a lower plate provided at the lower end of the main body;
A reinforcing plate provided on the main body part ,
Viaduct construction method. Using the crane device, a predetermined number of precast deck slabs are placed on the trestle, the cross beam, the rail beam, and the pair of bridge girders where the rails are not installed to form a floor surface. Equipped with a process,
The viaduct construction method according to claim 1. moving the crane device on the rail in a direction opposite to the area where the precast deck is placed;
A step of removing the rail, the rail beam, the cross beam, and the pedestal from an area adjacent to the area where the precast floor slab is placed to form an installation area in which a predetermined number of other precast floor slabs are installed. and,
comprising a step of placing a plurality of predetermined number of the precast floor slabs in the installation area;
The viaduct construction method according to claim 2. A step of integrating the plurality of precast deck slabs placed on the pair of bridge girders and the pair of bridge girders with concrete, and pouring concrete onto the precast deck slab to form a floor surface. prepare,
The viaduct construction method according to claim 2 or 3. A step of transporting the precast floor slab by traveling back and forth between a temporary storage location for the precast floor slab and a vicinity of the crane device, comprising a transportation trolley that runs on the pair of rails. Equipped with
The viaduct construction method according to claim 2 or 3. A viaduct construction device applied to the construction of viaducts, comprising:
a plurality of pedestals supported by a plurality of piers and installed on a pair of bridge girders facing each other along the bridge axis direction of the viaduct;
a plurality of cross beams installed on top of the plurality of frames so as to bridge the pair of bridge girders;
a pair of rail beams installed oppositely along the bridge axis direction of the viaduct on the plurality of cross beams;
a pair of rails installed on the pair of rail beams;
a crane device movably mounted on the pair of rails ,
The pedestal is
A main body formed in an H cross section when viewed from above;
an upper plate provided at the upper end of the main body;
a lower plate provided at the lower end of the main body;
A reinforcing plate provided on the main body part ,
Viaduct construction equipment.

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