JP2011208364A - Method for demolishing and removing support member in construction process of railroad rc rigid frame structure viaduct - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction method of a railroad RC rigid frame structure viaduct advantageous in improving work efficiency and reducing workers' burdens.SOLUTION: A plurality of first H-shape steel 34 and second H-shape steel 36 are laid and installed between the upper parts of support structures 20 erected from an underground beam 12. These first H-shape steel 34 and second H-shape steel 36 are used to mount first and second timbering and first and second floor slab forms, and concrete is placed in the floor slab forms in which reinforcements are assembled, to form a floor slab 16. The plurality of first H-shape steel 34 are connected to the floor slab 16 to suspend the first timbering and the first floor slab form from the floor slab 16 through the first H-shape steel 34, and then the support structures 20 are demolished and removed. Connection between the floor slab 16 and the first H-shape steel 34 is then released, and the first H-shape steel 34, the first floor slab form and the first timbering are lowered to the ground and demolished and removed on the ground.

Description

  The present invention relates to a method for dismantling and removing a support member in a construction process of a railway RC rigid frame structure viaduct.

Conventionally, as shown in FIG. 15 to FIG. 17 of Patent Document 1, a construction method of a railway RC rigid frame structure viaduct is known.
In this construction method, a frame-type support is provided on the entire ground between the pillars that stand up from the underground beam and constitute the pier, and then a floor slab form is attached to the frame-type support, and then the floor slab Assemble the reinforcing bars in the formwork. And concrete is cast in the formwork for floor slabs, and the floor slab couple | bonded with each pillar part is formed. Then, after the floor slab is formed, the floor slab formwork and the frame type support work are dismantled and removed.

JP 2008-274637 A

Therefore, in the conventional method, a frame-type support is required over the entire ground between the pillars, that is, over the entire ground located below the floor slab, and therefore the following steps must be performed in advance.
The process of backfilling underground beams.
A process to improve cement when the ground is soft.
The process of leveling the ground that is not horizontal (performing leveling).
The process of compacting the ground by rolling.
A process to prevent uneven settlement by installing an iron plate, sheet pile, or floor plate on the ground.
Therefore, there is a disadvantage that it takes a lot of time and manpower to work on the ground where the frame-type support is installed.
In addition, since frame type support work is required over the entire ground located below the floor slab, the cost of parts required for the frame type support work is great, and further, it is great for assembly and dismantling of the frame type support work. There is a disadvantage that takes time and manpower.
The present invention has been made in view of such circumstances, and an object thereof is to provide a method for constructing a railway RC rigid frame structure viaduct which is advantageous in improving work efficiency and reducing the burden on workers.

  In order to achieve the above-mentioned object, the present invention hangs between a foundation structure constructed in the ground, a plurality of pillars as bridge piers erected from the foundation structure, and an upper part of each pillar. A floor slab that is passed and coupled to each of the pillars and on which a track is laid, and a lower part of the floor swell is formed bulging downward at a location located above the pillar; and A method for constructing a railway RC rigid frame viaduct composed of a flat lower surface formed at a location other than the bulging portion, wherein each foundation structure portion is opposed to both side surfaces of each column portion in a bridge axis direction. A support structure in a direction perpendicular to the bridge axis direction so as to support the floor slab form forming the lower surface of the floor slab between the upper portion of the support structure. A work that spans and installs a plurality of first H-shaped steels extending along the axis of the bridge at intervals. Between the upper part of the support structure and at an interval in the bridge axis direction so as to support the place of the floor slab form forming the lower surface of the bulge portion of the floor slab, and perpendicular to the bridge axis direction Spanning and installing a plurality of second H-shaped steels extending along a direction, and providing a jack for adjusting the vertical position of the first and second H-shaped steels on the support structure; A floor slab form for forming the lower surface of the floor slab and a floor slab mold for forming the lower surface of the bulging portion of the floor slab on the first H-shaped steel and the second H-shaped steel. A step of attaching each of the first support work and the second support work supporting the frame; and reinforcing bars are assembled in the first and second floor slab formwork and are placed in the floor slab formwork. Forming the floor slab coupled to the upper part of the column portion by solidifying the concrete; The first and second H-shaped steel, the first and second floor slab formwork, and the first and second supporters are lowered by the reduction operation of the jack, and the lower surface of the floor slab and the bulge Forming a space between the lower surface of each part and the first floor slab formwork and the second floor slab formwork, and the second floor slab mold at the lowered position The frame and the second support are disassembled and removed from the location, and the step of removing the second H-shaped steel is connected to the floor slab and the lowered first H-shaped steel. Suspending the first support work and the first floor slab formwork on the floor slab via the first H-shaped steel, disassembling and removing the support structure, and the support After the structure is removed, the connection between the floor slab and the first H-section steel is released, the first H-section steel, the first floor slab formwork, A step of suspending the first support work on the ground, and a step of dismantling and removing the first H-shaped steel, the first floor slab formwork, and the first support work on the ground after the suspension process. It is characterized by including.

According to the present invention, the plurality of first H-shaped steels, the second steels between the upper portions of the support structures standing from the foundation structure or between the support brackets of the pillars standing from the foundation structure. The H-shaped steel is installed and the first H-shaped steel and the second H-shaped steel are used to mount the support and floor slab formwork, and the concrete in the floor slab formwork where the reinforcing bars are assembled. A floor slab was formed by casting.
Therefore, compared with the conventional method using a frame-type support, various work to be performed on the ground to install the support is not required, and support is performed over the entire ground located below the slab. Since there is no need for installation, the cost of parts required for the support work can be reduced, which is advantageous in significantly reducing the time and manpower required to assemble and dismantle the frame-type support work.
Further, in the present invention, the first support slab and the first floor slab formwork are suspended from the floor slab via the first H type steel by connecting the plurality of first H-shaped steels to the floor slab. After that, the support structure is dismantled and removed, and then the connection between the floor slab and the first H-shaped steel is released, and the first H-shaped steel, the first floor slab formwork, and the first support work are placed on the ground. Hang them down and dismantle them.
Therefore, after dismantling and removing the first floor slab formwork and the first support work at a high place, the dismantling and removal is performed compared to the case where the first H-shaped steel is pulled out and removed horizontally. Work efficiency can be increased, which is more advantageous in improving work efficiency and reducing the burden on workers.

It is a front view which shows the structure of the railway RC rigid-frame structure viaduct 10 in embodiment. It is a top view of FIG. It is a top view which shows arrangement | positioning of the pillar part corresponding to A part of FIG. 1, a support structure, and H-shaped steel. It is a top view which shows arrangement | positioning of the girder arrange | positioned on a foundation structure part. It is AA sectional view taken on the line of FIG. FIG. 4 is a sectional view taken along line BB in FIG. 3. (A1) is a front view of the railway RC frame structure viaduct 10 showing a state in which the jack 22 is contracted, (A2) is a side view of (A1), and (B1) is a steel bar 40 with a floor slab 16 and a receiving girder 30. The front view of the railway RC rigid frame structure viaduct 10 which shows the state connected through this, (B2) is a side view of (B1). (C1) is a front view of the railway RC frame structure viaduct 10 showing a state in which the support structure 20 is dismantled and removed, (C2) is a side view of (C1), (D1) is a girder 30, and a first H-shaped steel 34, a front view of the railway RC rigid frame structure viaduct 10 showing a state where the first floor slab formwork and the first support work are suspended on the ground, (D2) is a side view of (D1). (E1) is a front view of the railway RC rigid frame structure viaduct 10 in a completed state, and (E2) is a side view of (E1). FIG. 3 is an enlarged front view of the railway RC rigid frame structure viaduct 10 showing a state where the receiving girder 30, the first H-shaped steel 34, the first floor slab formwork, and the first support work are suspended from the ground. FIG. 3 is an enlarged side view of the railway RC rigid frame viaduct 10 showing a state in which the receiving girder 30, the first H-shaped steel 34, the first floor slab formwork, and the first support work are suspended from the ground.

Next, embodiments of the present invention will be described with reference to the drawings.
First, the construction of the railway RC rigid frame structure viaduct 10 constructed by the construction method of the present invention will be described, and then the construction method of the railway RC rigid frame structure viaduct 10 (hereinafter referred to as viaduct 10) will be described.
As shown in FIG. 1, the viaduct 10 includes an underground beam 12, a plurality of pillars 14, and a floor slab 16.

As shown in FIG. 4, the underground beam 12 constitutes a foundation structure portion, and includes two beam portions 1202 that are parallel to each other and a plurality of connecting portions 1204 that connect the two beam portions 1202.
The two beam portions 1202 extend in the bridge axis direction, and are provided at intervals in a direction orthogonal to the bridge axis direction.
The connecting portions 1204 are provided at substantially equal intervals in the bridge axis direction and extend in a direction perpendicular to the bridge axis direction.

The column portion 14 is erected from the underground beam 12, and in this embodiment, as shown in FIG. 4, the column portion 14 is erected from the portion of the underground beam 12 where the beam portion 1202 and the connecting portion 1204 intersect. ing.
Therefore, the pillar portions 14 are erected at substantially equal intervals in the bridge axis direction.
In the present embodiment, the pillar portion 14 has a rectangular cross section.
The underground beam 12 and the column portion 14 are constructed by various conventionally known construction methods such as placing concrete in a formwork assembled with reinforcing bars and solidifying the concrete.

As shown in FIG. 6, the floor slab 16 is spanned between the upper portions of the column portions 14 and is coupled to the column portions 14.
On the upper surface of the floor slab 16, a beam portion 1602 bulges out at an interval in the width direction, and this beam portion 1602 extends over the entire length of the floor slab 16. Tracks are laid on the upper surfaces of these beam portions 1602, respectively.
As shown in FIG. 1, the lower portion of the floor slab 16 has a bulging portion 1604 that bulges downward at a location located above the column portion 14 and a flat portion formed at a location other than the bulging portion 1604. It consists of a lower surface 1606.
1, 5, and 6, reference numeral 1608 denotes a soundproof wall that is erected from both sides of the floor slab 16 in the width direction and extends over the entire length of the floor slab 16.

Next, a method for constructing the viaduct 10 will be described.
In the following description, it is assumed that the construction of the underground beam 12 and the plurality of column portions 14 has been completed.
As shown in FIGS. 1 and 4, the support structure 20 is erected from the foundation structure portion 12 so as to face both side surfaces of each column portion 14 in the bridge axis direction. In the present embodiment, as shown in FIG. 1, the support structures 20 on both side surfaces are connected by another support structure 21 to reinforce the support structure 20.
In the present embodiment, the support structure 20 is a pin coupling structure configured to include a roof girder 2002 and a support column 2004.
As shown in FIG. 1 and FIG. 4, the roof girder 2002 is hung between the two beam portions 1202 along the direction orthogonal to the bridge axis direction on both sides of each column part 14 in the bridge axis direction. It is made of steel.
A plurality of struts 2004 are erected from a place of a cross girder 2002 spaced in a direction orthogonal to the bridge axis direction, and the plurality of struts 2004 are connected to each other by a horizontal material or a diagonal material.
As the strut 2004, a conventionally known member such as a pipe strut, a steel strut, a square strut, or a vent material can be used.

Next, as shown in FIGS. 5 and 6, a jack 22 is attached to each support structure 20. In the present embodiment, a jack 22 is attached to the upper end portion of each support structure 20. The jack 22 adjusts the vertical position of a first H-shaped steel 34 and a second H-shaped steel 36, which will be described later, and the first H-shaped steel 34 and the second H-shaped steel 36 during disassembly work. Is to lower.
Note that the position where the jack 22 is attached is not limited to the upper end portion of the support structure 20, and may be an intermediate portion or a lower end portion of the support structure 20. In short, the first H-shaped steel 34, the second It suffices if the vertical position of the H-shaped steel 36 can be adjusted.
As a result, the jacks 22 are respectively provided between the support structure 20 and the first H-shaped steel 34 and the second H-shaped steel 36. The height of the jack 22 is adjusted in advance in a state where the jack 22 is attached to the upper end portion of the support structure 20.
As such a jack 22, various conventionally known jacks can be used.

Next, as shown in FIG. 5, between the upper parts of the support structure 20, the first floor slab form (not shown) is orthogonal to the bridge axis direction so as to support the portion where the lower surface 1606 of the floor slab 16 is formed. A plurality of first H-shaped steels 34 that extend along the bridge axis direction are spaced from each other and installed. In other words, at a location that does not interfere with the bulging portion 1604, a plurality of first H-shaped steels 34 that are spaced in the direction orthogonal to the bridge axis direction and extend along the bridge axis direction are disposed between the upper portions of the support structure 20. Overhang and install.
In this embodiment, as shown in FIGS. 3 and 5, a plurality of pillow girders 26 extending in parallel with the bridge axis direction are hung on the upper portions of the jacks 22 at intervals in a direction perpendicular to the bridge axis direction. hand over.
Next, a spacer member 28 for height position adjustment is attached on each pillow girder 26.
Next, a plurality of receiving girders 30 extending along a direction orthogonal to the bridge axis direction are hung on the spacer members 28 at intervals in the bridge axis direction.
Then, a plurality of first H-shaped steels 34 as main girders are spanned on each receiving beam 30 at intervals in a direction perpendicular to the bridge axis direction, and each first H-shaped steel 34 is arranged in the bridge axis direction. Extend.

Next, as shown in FIG. 6, the bridge is formed between the upper portions of the support structure 20 so that a second floor slab form (not shown) supports a portion where the lower surface of the bulging portion 1604 of the floor slab 16 is formed. A plurality of second H-shaped steels 36 that extend along a direction orthogonal to the bridge axis direction and spaced apart in the axial direction are installed.
In the present embodiment, as shown in FIGS. 3 and 6, a plurality of pillow girders 26 extending in parallel with the bridge axis direction are hung on the upper portions of the jacks 22 at intervals in a direction perpendicular to the bridge axis direction. hand over.
Next, a plurality of second H-shaped steels 36 as main girders are spanned on each pillow girder 26 at intervals in the bridge axis direction, and each second H-shaped steel 36 is arranged in a direction orthogonal to the bridge axis direction. Extend.

Next, a first support 38 and a second support (not shown) are mounted on the first H-shaped steel 34 and the second H-shaped steel 36, respectively. The first support member 38 is configured by using a conventionally known member such as a veneer plate member 3802 and a joist member 3804 (see FIG. 1). The second support work is also configured by using a conventionally known member similar to the first support work 38.
Next, the first floor slab formwork and the second floor slab formwork are attached to the first support work 38 and the second support work, respectively.
Next, rebars are assembled in the first and second floor slab formwork, and concrete is placed in the formwork for floor slab and cured to solidify the concrete. A combined floor slab 16 is formed.

Next, after the concrete is solidified, the support structure 20, the first and second H-shaped steels 34 and 36, the first and second floor slab formwork, and the first and second support works are dismantled and removed.
Hereinafter, the process of dismantling and removal will be described in detail.

  First, as shown in FIGS. 7A1 and 7A2, the first and second H-shaped steels 34 and 36, the first and second floor slab formwork, The second support is lowered to form spaces between the lower surface 1606 of the floor slab 16 and the lower surface of the bulging portion 1604 and the first floor slab formwork and the second floor slab formwork, respectively. .

Next, as shown in FIGS. 7 (B1) and (B2), the floor slab 16 and the lowered first H-section steel 34 are connected to the floor slab 16 via the first H-section steel 34. Suspend 1 support and first floor slab formwork.
In the present embodiment, for each receiving girder 30, the steel bar 40 is connected to two places of the receiving girder 30 spaced in the direction orthogonal to the bridge axis direction and two places of the floor slab 16 facing the two places. Use to connect.
More specifically, a male screw is formed on the outer periphery of the steel bar 40. As such a steel bar 40, various conventionally known steel bars such as a PC steel bar, a deformed PC steel bar, and a Gebinde can be used. .
As shown in FIGS. 10 and 11, connecting members 3002 are respectively provided at two locations of the receiving beam 30 spaced in the direction orthogonal to the bridge axis direction, and the connecting member 3002 penetrates in the connecting vertical direction (not shown). Receiving beam side insertion holes are respectively formed.
A floor slab side insertion hole (not shown) penetrating in the vertical direction is formed at two locations of the floor slab 16 facing the beam receiving side insertion hole.
The steel bar 40 is inserted through the floor slab side insertion hole and the girder side insertion hole.
An upper nut having a diameter larger than that of the floor slab insertion hole is screwed into a portion of the steel bar 40 positioned on the upper surface of the floor slab 16, and the upper nut is engaged with the upper surface of the floor slab 16.
A lower nut having a diameter larger than that of the receiving beam side insertion hole is screwed into a portion of the steel bar 40 positioned below the receiving beam side insertion hole, and the lower nut is a connecting member around the receiving beam side insertion hole. 3003 is engaged.
Thereby, the floor slab 16 and the receiving girder 30 are connected via the steel bar 40.
Here, since the first H-shaped steel 34 is stretched over the receiving beam 30, the floor slab 16 and the first H-shaped steel 34 are connected via the steel bar 40, and accordingly, the first slab steel 34 is connected to the floor slab 16. The first support work and the first floor slab formwork are suspended through one H-shaped steel 34.

  In addition, the following work is performed in parallel with the above-described first support work and the work of hanging the first floor slab formwork. That is, as shown in FIGS. 7A1 and 7A2, the second floor slab formwork, the second floor slab formwork, and the second floor slab form, The support work is dismantled and removed from the location, and the second H-shaped steel 36 is removed. In the present embodiment, together with the second H-shaped steel 36, the pillow girder 26 interposed between the jack 22 and the second H-shaped steel 36 is removed.

Next, as shown in FIGS. 8C1 and 8C2, the first support work and the first floor slab form are suspended from the floor slab 16 via the first H-shaped steel 34. Then, the support structure 20 is dismantled and removed. In the present embodiment, the jack 22, the pillow girder 26, and the spacer 28 are disassembled and removed together with the support structure 20.
In this case, since the support structure 20 is separated from the first H-shaped steel 34, the first support work, and the first floor slab formwork, the support structure 20 can be easily disassembled and removed. This is advantageous in improving work efficiency and reducing the burden on the operator.

Next, as shown in FIGS. 8D1 and 8D2, after the support structure 20 is removed, the connection between the floor slab 16 and the first H-shaped steel 34 is released, and the first H-shaped steel 34, 1 Formwork for floor slab, first support work is suspended on the ground.
That is, in this embodiment, the first H-shaped steel 34, the first floor slab formwork, and the first support work are suspended from the ground using the chain block 44.
As shown in FIGS. 9 and 10, the chain block 44 includes a main body 44A, an upper hook 44B provided on the main body 44A, a chain 44C wound up by the main body 44A, and a lower hook 44D provided on the chain 44C. I have.
As such a chain block 44, various types of conventionally known hoisting machines such as an electric or manual chain block or a lever hoisting machine (lever block) can be used.
A frame 44 is installed around each steel bar 40 on the upper surface of the floor slab 16, and the chain block 44 is supported by the frame 44 by being suspended from the frame 44 via an upper hook 44B.

The connection between the floor slab 16 and the first H-shaped steel 34 is released by connecting the upper end of the steel bar 40 to the lower hook 44D via a connecting member (not shown), and then screwing the upper side screwed to the steel bar 40. This is done by moving the nut away from the floor slab 16.
The operation of hanging the first H-shaped steel 34, the first floor slab formwork, and the first support work on the ground is performed as follows.
That is, by operating the chain block 44 in the direction in which the chain 44C is extended, the receiving girder 30, the first H-shaped steel 34, the first floor slab formwork, and the first support work are suspended from the ground.
The lift of the chain block 44, in other words, the amount of movement of the chain block 44C is between the receiving beam 30, the first H-shaped steel 34, the first floor slab formwork, the first support work and the ground. Often shorter than distance.
In this case, as shown in FIGS. 10 and 11, a plurality of steel rods 40 having a total length shorter than the head of the chain block 44 are prepared in advance, and the steel rods 40 are connected to each other via the coupler 41 while receiving them. The girders 30, the first H-shaped steel 34, the first floor slab formwork, and the first support work may be suspended on the ground.

Next, the girder 30 suspended from the ground, the first H-shaped steel 34, the first floor slab formwork, and the first support work are dismantled and removed on the ground. In addition, soundproof walls 1608 are provided on both sides in the direction orthogonal to the bridge axis direction of the floor slab 16.
Thereby, as shown to FIG. 9 (E1) and (E2), the railway RC frame structure viaduct 10 is completed.

  The backfilling of the underground beam 12 may be performed after the construction of the underground beam 12 and the plurality of column portions 14 is completed, or may be performed during the construction of the floor slab 16, or the floor It may be performed after the construction of the plate 16 is completed.

  Moreover, although this embodiment demonstrated the case where the foundation structure part was comprised with the underground beam 12, it comprised including the footing by which a foundation structure part was couple | bonded with the lower part of the pillar part 14, and was embed | buried in the ground. May be. Or the lower part of the pillar part 14 may be embed | buried under a foundation structure part, and the lower part of the pillar part 14 embed | buried under the foundation structure part may comprise a part of foundation structure part.

As described above, according to the present embodiment, a plurality of first H-shaped steel 34 and second H-shaped steel 36 are installed across the upper portion of the support structure 20 erected from the underground beam 12. Then, using the first H-shaped steel 34 and the second H-shaped steel 36, the first and second support slabs, the first and second floor slab forms are attached, and the slab is assembled. The floor slab 16 was formed by placing concrete in the formwork.
Therefore, as compared with the conventional method using a frame-type support work, various operations to be performed on the ground to install the support work become unnecessary, which is advantageous in greatly reducing time and manpower.
In addition, compared to the conventional method using a frame-type support, it is not necessary to install a support over the entire ground located below the floor slab, so the parts cost required for the support can be reduced, and the frame-type support This is also advantageous for greatly reducing the time and labor required for assembly and dismantling of the work.
Therefore, it is advantageous in improving work efficiency and reducing the burden on workers.

Further, according to the present embodiment, by connecting a plurality of first H-shaped steels 34 to the floor slab 16, the first support and the first floor are connected to the floor slab 16 via the first H-shaped steel 34. After suspending the plate formwork, the support structure 20 is dismantled and removed, and then the connection between the floor slab 16 and the first H-shaped steel 34 is released, and the first H-shaped steel 34 and the first floor slab are removed. The formwork and the first support work were suspended on the ground, and they were dismantled and removed.
Therefore, when the first floor slab form and the first support work are dismantled and removed at a high place, and then the first H-shaped steel 34 is pulled out and removed in a horizontal direction using a crane or the like. Compared with this, it is advantageous in improving the efficiency of the dismantling and removal work.
Therefore, it goes without saying that it is more advantageous in improving work efficiency and reducing the burden on the worker, and it is advantageous in reducing the burden on the operator because it can reduce work at high places.

In the present embodiment, the case where the floor slab 16 and the lowered first H-shaped steel 34 are connected using the steel bar 40 is described. However, instead of the steel bar 40, a wire, a chain, or a PC is used. Steel bars, PC strands, FRP materials, general steel materials, etc. may be used.
However, when the steel bar 40 having a male thread is used as in the present embodiment, the engagement between the steel bar 40 and the floor slab 16 and the engagement between the steel bar 40 and the connecting member 3002 are performed on the upper nut and the lower side. Since it can be easily performed using an existing member such as a nut, it is advantageous in improving workability.

In the present embodiment, the case where the first H-shaped steel 34, the first floor slab formwork, and the first support work are suspended on the ground using the chain block 44 has been described. A center hole jack may be used instead.
In this case, the center hole jack is jacked down in a state where the steel bar 40 is engaged with the ram of the center hole jack via a nut screwed to the steel bar 40, whereby the first H-shaped steel 34 is moved by a predetermined distance. The first floor slab formwork and the first support are suspended from the ground.
Next, after the engagement position between the ram and nut of the center hole jack is moved upward by the predetermined distance, an operation of jacking down the center hole jack may be repeated.
However, since the predetermined distance (the distance at which the center hole jack can be jacked down at a time) is, for example, about 200 mm, the first H-shaped steel 34 and the first floor slab mold over a distance of several meters or more. In the case of lowering the frame and the first support work, the number of operations described above increases and the work time also becomes longer.
Therefore, when the distance from the position where the first H-shaped steel 34, the first floor slab formwork, and the first support work are connected to the floor slab 16 to the ground is large, as in the present embodiment. The use of the chain block 44 having a head unit in meters is more advantageous in improving work efficiency and reducing the burden on workers.

Further, instead of the chain block 44, a device such as a crane or a winch having a winding function may be used.
For example, the following method can be considered.
1) A method of hanging with 4 cranes or winches.
2) A method of hanging with two cranes or winches using a hanging jig for two places.
In this case, the construction period can be shortened as compared with the embodiment although the cost increases because the machine equipment is enlarged.

10 ... Rail RC ramen structure viaduct 12 ... Underground beam 14 ... Column 16 ... Floor slab 1602 ... Beam 1604 ... Swell 1606 ... Underside 20 ... Support structure 22 ... Jack 34 …… First H-shape steel 36 …… Second H-shape steel 38 …… First support construction 40 …… Steel bar 44 …… Chain block

Claims (7)

A foundation structure constructed in the ground, a plurality of pillars as piers erected from the foundation structure, and spanned between the upper parts of the pillars and coupled to the pillars, A floor slab to be laid,
The lower part of the floor slab is composed of a bulging part that bulges downward at a position located above the pillar part, and a flat bottom surface formed at a place other than the bulging part. A method for constructing a ramen structure viaduct,
A step of erecting a support structure from the foundation structure portion so as to face both side surfaces of each pillar portion in the bridge axis direction;
Extending along the bridge axis direction at intervals in the direction orthogonal to the bridge axis direction so as to support the location of the formwork for the floor slab that forms the lower surface of the floor slab between the upper parts of the support structure Spanning and installing a plurality of first H-shaped steels;
In a direction perpendicular to the bridge axis direction with an interval in the bridge axis direction so as to support a portion of the floor slab formwork that forms the lower surface of the bulge portion of the floor slab between the upper portions of the support structure. Spanning and installing a plurality of second H-shaped steels extending along;
Providing a jack for adjusting the vertical position of the first and second H-shaped steels in the support structure;
A floor slab form forming the lower surface of the floor slab and a floor slab form forming the lower surface of the bulging portion of the floor slab on the first H-shaped steel and the second H-shaped steel. Attaching each of the first support and the second support to support
The floor slab coupled to the upper part of the column portion is obtained by assembling reinforcing bars in the first and second floor slab molds and solidifying the concrete cast in the floor slab molds. Forming, and
The reduction operation of the jack lowers the first and second H-shaped steel, the first and second floor slab formwork, and the first and second supporters to lower the bottom surface of the floor slab and the swelling. Forming a space between the lower surface of the protruding portion and the first floor slab formwork and the second floor slab formwork,
Disassembling and removing the second floor slab formwork and the second support work at the lowered position, and removing the second H-shaped steel; and
By connecting the floor slab and the lowered first H-shaped steel, the first support and the first floor slab formwork are connected to the floor slab via the first H-shaped steel. A hanging process,
Dismantling and removing the support structure after the hanging step;
After the support structure is removed, the connection between the floor slab and the first H-shaped steel is released, and the first H-shaped steel, the first floor slab formwork, and the first support work are grounded. A process of hanging on,
Dismantling and removing the first H-shaped steel, the first floor slab formwork, and the first support work on the ground;
A method for constructing a railway RC ramen structure viaduct. The connection between the floor slab and the lowered first H-shaped steel is made through a steel rod on which a male thread is formed.
The method for constructing a railway RC ramen structure viaduct according to claim 1. The first H-shaped steel, the first floor slab formwork, and the first supporting work are suspended from the ground using a chain block installed on the floor slab.
The method for constructing a railway RC ramen structure viaduct according to claim 1 or 2. The first H-shaped steel, the first floor slab formwork, and the first support work are suspended from the ground using a center hole jack installed on the floor slab,
The method for constructing a railway RC ramen structure viaduct according to claim 1 or 2. The first H-shaped steel, the first floor slab formwork, and the first support work are suspended from the ground using an apparatus having a hoisting function installed on the floor slab.
The method for constructing a railway RC ramen structure viaduct according to claim 1 or 2. In the floor slab, a plurality of beam portions extending in the bridge axis direction are formed on the upper surface of the floor slab at intervals in a direction orthogonal to the bridge axis direction.
The construction method of a railway RC ramen structure viaduct according to any one of claims 1 to 5. The foundation structure part is an underground beam extending along the extending direction of the floor slab and buried in the ground.
The construction method of a railway RC ramen structure viaduct according to any one of claims 1 to 5.

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