JP2001115421A - Construction method for temporary bridge and pier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction method for temporary bridges and piers which is excellent in workability and safety and is capable of long distance construction work at a time and at a low cost. SOLUTION: In the method to construct temporary bridges and piers, three processes are repeated; a process to support the tip side of at least two beams by a temporary pile overhanging in the construction direction from an existing stage, a process to construct a stage by driving columns for a temporary bridge and a temporary pier and constructing the upper sections of the existing stage from the top sections of the beams and a process to support the temporary pile with the beam fed forward to be overhung in the construction direction from the existing stage constructed in the previous process.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for erection of a temporary bridge and a temporary pier.

[0002]

Conventionally, when constructing a temporary bridge and a temporary pier, it is necessary to construct a temporary gantry for driving a pile bridge pier and a scaffold for superstructure work, and it is difficult to carry in equipment. In mountainous areas and sloping lands, work is performed in poor working environments, and workability and safety have been desired to be improved.

[0003]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and is excellent in workability and safety, inexpensive, and can be applied for a long distance at a time. An object of the present invention is to provide a method for erection of a temporary bridge temporary pier.

[0004]

According to the present invention, there is provided a method for erection of a temporary bridge and a temporary pier, the method comprising the steps of: providing at least two beams extending from an existing stage in the installation direction in a temporary pile; Step of constructing the stage by performing the work of placing the temporary bridge temporary pier and superstructure from the beam, and sending the beam forward and stretching the existing stage constructed in the previous process in the direction of erection. And providing a temporary pier and a temporary pier.

[0005] In the above method of erection of a temporary bridge temporary pier, the beam is fixed in a cantilever manner on a receiving portion projecting from both sides of the existing stage. Provide a way.

In the method of erection of the temporary bridge and the temporary pier, when the front end side of the beam is supported on the temporary pile, the bending of the beam is corrected by lifting up a girder suspended laterally on the lower surface side of each beam. Thereafter, a method for erection of a temporary bridge temporary pier, characterized in that the beam receiving girder and the upper end of the temporary pile are connected to support the lower surface on the beam tip side on the upper surface of the beam receiving girder.

Further, in the method of erection of the temporary bridge temporary pier, a method of erection of the temporary bridge temporary pier is provided, wherein the beam is installed inclined on an existing stage with a rotating piece interposed. Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS <A> Construction of base stage First, as shown in FIGS. 1 and 2, a first stage is constructed from above the ground using a crane and a vibro hammer. The present embodiment is a case where three columns 1 of H steel, steel pipe, etc. are arranged in parallel and two rows are cast, but the number of works differs depending on various conditions such as the scale of the work. In addition, the base stage can be constructed by various known methods.

Next, the heads of the columns 1 arranged in a direction perpendicular to the direction of erection of the temporary bridge are sandwiched between a pair of cross beams 11 and connected by welding or the like. At this time, both ends of the cross beam 11
Protrusions are laterally protruded from the pillars 1 at both ends to form a receiving portion 12 for mounting a beam described later. Further, the struts 1 arranged in the direction of erection of the temporary bridge are connected and reinforced by the panelized breath 13. The breath 13 can be made into a panel, so that the work of on-site welding can be reduced.

Next, a plurality of main girders 14 are joined at appropriate intervals between the receiving beams 12 on the cross girders 11 in the direction of erection of the temporary bridge. The main girder 14 is made of H steel or the like. On the main girder 14, a plurality of lining plates 15 are laid out.

<B> Projection of Beam As shown in FIG. 3, one end of two beams 2 made of H steel or the like is cantilevered by using a support plate 21, a stopper 22, etc. on a receiving portion 12. And protrude from both sides of the base stage in the erection direction. The beams 2 are connected and reinforced by a breath 23 or the like. The projecting operation of the beam 2 is performed while the beam 2 is lifted by the crane 3.

Although not shown, a work scaffold is attached to the beam 2 along its entire length, and necessary superstructure work is performed throughout the entire process such as the work of installing the breath 23. Although not shown, depending on the size of the temporary bridge and the temporary pier, it is also conceivable to provide a receiving portion 12 in which the lining plate 15 is not disposed on both sides and an intermediate portion of the stage, and construct three or more beams 2. .

<C> Placement of temporary pile A temporary pile 4 made of H steel or the like is placed near the inside of the tips of the two beams 2. The placing operation is performed by lifting the temporary pile 4 by the crane 3 that has entered the lining plate 15 and driving the temporary pile 4 into the base ground with a vibro hammer. For the casting work, an appropriate construction method is determined according to the site. After the temporary pile 4 has been driven, the beam 2 may be extended. When three or more beams 2 are erected, the temporary piles 4 are also driven according to the number.

<D> Support of Beam Tip The tip of the beam 2 is supported on the upper end of the temporary pile 4 that has been cast. The support means is a girder 4 such as H steel as shown in FIGS.
1 and the holding device 5. As shown in FIG. 4, the holding device 5 includes a strip-shaped holding member 51 for hooking the temporary pile 4 on the H steel web portion or the like, a box-shaped holding member 52 for holding the receiving beam 41, and the like. Consisting of

The hanging member 51 is provided at the upper end of the band plate or the like.
To form hooks for hooking on Holding member 52
The two plates are opposed to each other to form a box or the like, and an insertion opening 53 for inserting the receiving beam 41 in the horizontal direction is opened in each plate. Then, as shown in FIG. 4, the holes 54, 5
5 are overlapped and connected by pins 56. Note that a plate-shaped stopper 57 is attached to the head side of the pin 56, and is hooked on a stopper receiver 58 having a receiving groove to prevent the pin 56 from falling off.

In the method of supporting the tip of the beam 2, first, a hooking member 51 is attached in advance to the upper end of the temporary pile 4 that has been cast. Next, with the holding members 52 attached to both ends of the receiving beam 41, the receiving beam 41 is fixed to the lower surface of the beam 2 by Bullman or the like. Next, after the receiving beam 41 is lifted by the crane 3 until the bending of the beam 2 is corrected, the hooking member 51 and the holding member 52 are connected by the pin 56. Thereby, the reaction force and the load acting on the beam 2 when the excavator 7 described later is operated are transmitted and shared to the temporary pile 4 via the holding device 5.

FIG. 5 shows a holding device 6 used in the case of a tubular temporary pile 42 for rock construction. The holding device 6 includes a hooking member 61 for hooking the temporary pile 42, a holding member 62 for holding the girder 41, and a fitting portion 63 for connecting them.

The hooking member 61 is bent in a U-shape.
One end thereof can be inserted into the upper end opening of the pipe of the temporary pile 42, and a plurality of holes 64a are opened at the other end. The holding member 62 is formed in a box shape or the like with two plate bodies facing each other, and an insertion port 65 for inserting the receiving beam 41 in the horizontal direction.
Is set up on each plate.

The fitting portion 63 is a tube into which the temporary pile 42 can be inserted. A bracket 66 is protruded from one side of the fitting portion 63. The holding member 62 is pivotally supported by a hinge 67 so as to be rotatable. Is provided with a flat plate portion 68 and a plurality of insertion holes 64b for the pins 69 are formed. Note that the fitting portion 63 may have a structure in which a half-split tube body is hinged so as to be freely opened and closed.

As a method of supporting the tip of the beam 2, first, the receiving beam 41 is fixed to the lower surface of the beam 2 with a Bullman or the like while the holding member 62 and the fitting portion 63 are attached to both ends of the receiving beam 41. Next, the temporary pile 42 is inserted into the fitting portion 63 and the temporary pile 4 is inserted.
The temporary pile 42 is driven in the vertical direction by hitting the upper end of 2 with a driving weight suspended by the crane 3 or the like. At this time, even if the beam 2 and the holding member 62 are in the oblique posture, the hinge 6
The vertical posture of the fitting portion 63 and the temporary stake 42 can be maintained through the connection member 7. When the fitting portion 63 is in the vertical position, the hinge 67 is fixed with a stopper (not shown).

After placing the temporary pile 42, the upper end of the temporary pile 42
The hook member 61 is attached. Then, the receiving beam 41 is lifted by the crane 3 until the bending of the beam 2 is corrected, and the pin 69 is inserted into a portion where the hole 64a, 64b of the latch member 61 and the flat plate portion 68 overlaps to connect and fix them.

<E> Standing up of pillars After both beams 2 are supported on the temporary pile 4, as shown in FIG.
The gantry 24 is horizontally mounted between the beams 2, and the excavator 7 is set thereon. The drilling device 7 uses a known device such as a rotating device 71 fixed on the gantry 24 and a down-the-hole drill 72 suspended by the crane 3 and rotatably penetrating the rotating device 71.

After excavation by the excavator 7, a ruler is attached to the beam 2 and fixed, and a predetermined number of columns 1 are erected between the beams 2 at intervals. In the present embodiment, as shown in FIG. 6, three beams are arranged at intervals in the direction between the beams 2 and are arranged in two rows in the erection direction.

As described above, the work for setting up the support column 1 can be performed on the beam and the base stage, so that there is no need to temporarily mount the gantry on the ground. In addition, since the column 1 can be installed on the ground at a maximum of 15 m away from the base stage with a 50-ton crane, the installation distance of one process can be increased.

<F> Construction of Stage As shown in FIGS. 6 and 7, a suspension scaffold 8 is set on the beam 2. Then, from the suspending scaffold 8 and other working scaffolds (not shown) arranged on the beam 2, similarly to the structure of the base stage in FIGS.
At the top of the cross beam 11, breath 13, main girder 14, lining board 1
Apply a superstructure such as 5th grade. At this time, the main girder 14 is connected to the main girder 14 of the base stage, and the lining plate 15 removes the breath 23 and spreads the base stage continuously. Since these superstructures can be performed on the beam 2, it is not necessary to assemble the temporary scaffold from the ground.

<G> Beam delivery After the lining is completed, as shown in FIG. 8, the beam 2 is delivered one pitch forward, and the beam 2 is placed on the beam receiving portion 12 of the new stage similarly to FIG. Fix it in a portable manner and project it in the installation direction. The above steps are repeated to build a temporary bridge temporary pier of a predetermined length.

As shown in FIG. 9, a known rotating piece 9 is interposed between the beam 2 and the receiving part 12, and a block 91 is interposed between the beam 2 and the receiving part 12 at the front end side (right side in the drawing) in the erection direction. By doing so, it becomes possible to project the beam 2 inclining according to the gradient.

[0028]

Since the present invention has been described above,
The following effects can be obtained. <a> Almost no special processing members such as conventional unit pier panels are required. For this reason, conventional inexpensive heavy temporary materials such as H steel can be used, which is economical.

<B> With a 50-ton crane from above the existing stage, it is possible to construct a pillar up to 15 m away from the ground. Therefore, a long distance up to 15 m can be constructed in one process, and construction efficiency can be improved.

<C> Most of the work can be performed from the suspended scaffold on the existing stage or on the beam, so that the work on the base surface can be reduced as much as possible. Therefore, the work on the temporary bridge and the temporary pier can be performed safely and efficiently without being affected by the topography.

<D> By arranging the beam on the existing stage with a rotating piece interposed, the beam can be easily and reliably inclined according to the gradient.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a construction process of an existing base stage.

FIG. 2 is an explanatory view of a construction process of an existing base stage.

FIG. 3 is an explanatory view of beam overhanging, provisional pile driving, and strut driving processes.

FIG. 4 is an explanatory view of a girder holding device.

FIG. 5 is an explanatory view of a girder receiving device;

FIG. 6 is an explanatory view of beam overhanging, provisional pile driving, and strut driving processes.

FIG. 7 is an explanatory view of beam overhanging, provisional pile driving, and strut driving processes.

FIG. 8 is an explanatory view of a beam sending step.

FIG. 9 is an explanatory view of a beam tilt structure.

Claims (4)

[Claims] 1. A method for erection of a temporary bridge temporary pier, comprising: a step of supporting at least two beams protruding from an existing stage in a direction of erection with temporary piles; It is characterized by repeating the steps of constructing the stage by performing installation work and superstructure work, and sending the beam forward and extending it from the existing stage constructed in the previous process in the erection direction and supporting it with temporary piles. The method of erection of temporary bridge temporary pier. 2. The method according to claim 1, wherein the beam is fixed in a cantilever manner on a receiving portion protruding from both sides of the existing stage. How to build a temporary bridge pier. 3. The method for erection of a temporary bridge temporary pier according to claim 1 or 2, wherein when the tip end side of the beam is supported on a temporary pile, a receiving girder suspended horizontally on the lower surface side of each beam is lifted. A method for erection of a temporary bridge and a temporary pier, characterized in that after bending of a beam is corrected, a lower beam on a beam tip side is supported on an upper surface of the beam by connecting the beam and the upper end of a temporary pile. 4. The temporary bridge according to claim 1, wherein the beam is inclined on an existing stage with a rotary piece interposed therebetween. How to build a temporary pier.