JP4731419B2 - Ramen viaduct construction method and precast formwork - Google Patents

Description

  The present invention relates to a construction method of a ramen viaduct in which an RC slab is constructed by constructing an pier and a girder, placing a formwork in this girder, and placing concrete to construct an RC slab. It is related with the construction method of the ramen viaduct built using it.

  When constructing an overhang part with an inclined surface at the bottom of an RC slab with a ramen viaduct, the RC slab has been constructed by assembling a formwork for an RC slab including an overhang part and placing concrete on the construction site. It was.

  By the way, when the formwork for RC slabs is assembled at the construction site, there is a problem that it takes a lot of construction time. Moreover, if the site where the RC slab for the ramen viaduct is constructed is small, there may be a case where a site for installation such as a scaffold or a temporary support cannot be secured. In such a case, the construction is performed in a narrow place and the risk is high.

Therefore, instead of assembling the formwork at the construction site, it is conceivable to construct using the precast formwork (Patent Document 1), but the inclined surface angle when installing the precast formwork, When the angle of the bottom inclined surface of the projecting portion determined by the structural calculation is different, the projecting portion may be insufficient in strength, and conventionally, it has been difficult to use a precast formwork. In addition, even when installing a railing on the RC slab, since the bottom inclined surface angle of the RC slab overhang is fixed and the horizontal surface of the RC slab is not drilled, the railing cannot be vertically suspended. Since the railing is to be constructed (Patent Document 2), there is a problem that it takes a lot of construction time.
Japanese Patent Laid-Open No. 01-110103 JP 2005-273392 A

  The present invention has been made to solve such problems, and the installation work of the support for supporting the overhanging portion can be performed quickly and accurately, and it is safe even when the installation site for the scaffolding or temporary support cannot be secured. Moreover, it is a technical problem to provide a construction method and a precast formwork for a ramen viaduct that can be easily constructed.

The present invention employs the following means in order to solve the aforementioned problems.
That is, the construction method of the ramen viaduct of the present invention is the construction method of the ramen viaduct in which the pier and the girder are constructed, the concrete is placed in the girder and concrete is placed to construct the RC slab.
The RC slab includes a projecting portion that projects in the width direction of the ramen viaduct and has an inclined surface at the bottom, and the RC slab including the projecting portion is formed using a precast formwork. ,
Before installing the precast formwork, the inclined surface position that locates the inclined surface of the precast formwork by arranging support members having different heights aligned with the inclined surface of the overhanging portion in the width direction. A dispensing process;
On the support member that has been positioned, a mold installation step that installs the precast mold together with the inclined surface portion;
It is characterized by including.

  When the RC slab including the overhang portion is formed using a precast formwork, before installing the precast formwork, by positioning the inclined surface of the precast formwork by the support member in the inclined surface positioning step, Precast formwork can be constructed quickly and accurately. In addition, since the RC slab can be constructed using a precast formwork, it can be constructed safely and easily even when an installation site such as a scaffold or a temporary support cannot be secured. Furthermore, the precast formwork with this configuration can be an embedded precast formwork that does not need to be detached, or can be a partly precast formwork.

Further, in the construction method of the ramen viaduct of the present invention, in the inclined surface positioning step, the cross-sectional shape is a triangular prism shape forming a right triangle, and any of the inner angles at both ends of the hypotenuse facing the right angle of the right triangle Using an adjustment member whose one coincides with the inclination angle of the inclined surface,
When the adjustment member is installed so that the surface forming one of the two sides forming the right angle of the right triangle is horizontal, two or more kinds of inclined surfaces forming the oblique sides of the adjustment member are used as a ruler. The support member is positioned. According to this configuration, by using the adjustment member, the installation work of the erection support that supports the overhanging portion can be performed with high accuracy and in a short time.

Furthermore, in the construction method of the ramen viaduct of the present invention, in the inclined surface positioning step, a wedge-shaped plate and a cross-section are used,
The plate is fixed to the top of the support member, the large pull is fixed on the fixed plate, and the top of the large pull is brought into contact with the inclined surface of the overhanging portion so that the inclined surface of the precast formwork It is characterized by positioning. According to this configuration, conventionally, if the bottom surface of the projecting portion having an oblique shape is supported by the support as it is, it becomes unstable because it is supported by a point, but a large pull fixed to a wedge-shaped plate is used. Thus, the bottom surface of the overhang portion can be stably supported.

  Furthermore, the precast formwork used in the construction method for the ramen viaduct of the present invention is characterized in that a balustrade member vertically suspended from the RC slab is connected and integrally molded. According to this configuration, by precasting and integrating the formwork of the balustrade and the overhang portion, it is possible to avoid complicated operations such as bar arrangements that have been conventionally performed separately.

  Further, the precast formwork excluding the balustrade member is characterized in that a reinforcing material selected from the group of steel fiber, stainless fiber, aramid, vinylon, carbon fiber, and glass fiber is mixed therein. According to this configuration, it is possible to reduce the weight of the precast formwork. In this case, the precast formwork may be made of concrete or mortar.

  ADVANTAGE OF THE INVENTION According to this invention, the installation work of the ramen viaduct and precast formwork which can perform installation work of the support which supports an overhang | projection part accurately and rapidly, and can perform construction safely and easily even when installation sites, such as a scaffold and temporary support, cannot be secured Can be provided.

  The best mode for carrying out the method for constructing a ramen viaduct according to the present invention will be described in detail below with reference to the drawings.

In addition, as shown in FIG. 4, the ramen type viaduct has a plurality of bridge piers 1, 1... Erected at predetermined intervals substantially along one direction at positions spaced from each other. Of the bridge piers 1, 1... Of the bridge piers 1, 1... And a girder 3 of the plurality of piers 1, 1. RC constructed on the upper side of part 3
The slab 6 is roughly configured.

  In the present embodiment, the pier part 1, the foundation girder part 2, and the girder part 3 are constructed by placing concrete after site placement.

  The RC slab 6 is constructed as a precast concrete slab that is formed by placing concrete after placing the precast formwork (the center part formwork 4 and the overhanging formwork 5) on the upper side of the girder part 3.

  In this embodiment, the case where the precast mold is divided into the central mold 4 and the overhang mold 5 will be described. That is, the precast formwork is divided into a center part mold 4 that is installed at the center of the grid-like girder part 3 when viewed from above and a projecting part form 5 that is installed on both side edges of the viaduct. It shall be.

  The intermediate part formwork 4 is a precast formwork assembled near the factory or the site. Moreover, the intermediate part formwork 4 is roughly comprised by the formwork main body and the reinforcement part. The formwork body is formed in a rectangular shape, and a plurality of sheets having a predetermined length in the depth direction are arranged side by side along the viaduct. The material of the main body of the intermediate part mold 4 is made of concrete, and one or more reinforcing materials selected from the group of steel fiber, stainless fiber, aramid, vinylon, carbon fiber, and glass fiber are mixed therein. Yes. In addition, the reinforcing bar part is welded along the truss bar to the truss bar formed by bending a long reinforcing bar partly embedded in the main body of the mold and projecting upward into a truss shape, and the top and bottom of this truss bar And a fixed reinforcing bar 41.

  The overhanging part form 5 is also a precast form that is assembled in the vicinity of the factory or the site, like the intermediate part form 4. Moreover, the overhang part formwork 5 is roughly comprised by the formwork main body and the reinforcement part. The formwork body is formed in a rectangular shape, and a plurality of sheets having a predetermined length in the depth direction are arranged side by side along the viaduct. The material of the main body of the overhang part formwork 5 is made of concrete, and is mixed with one or more reinforcing materials selected from the group of steel fiber, stainless steel fiber, aramid, vinylon, carbon fiber, and glass fiber. Yes. In addition, the bar arrangement part is a truss bar 51 formed by bending a long reinforcing bar partly embedded in the main body of the mold and projecting upward into a truss shape, and the top and bottom of the truss bar along the truss bar. And a reinforcing bar fixed by welding.

  Further, the overhang part formwork 5 is integrally formed by connecting a balustrade member 7 that is vertically suspended from the RC slab 6.

[Ramen viaduct construction method (RC slab installation process)]
Next, the construction method of the ramen viaduct according to the present embodiment will be described.
That is, in the construction method of the ramen viaduct (RC slab installation step), when the RC slab 6 is constructed, first, a plurality of central part frames 4 are arranged side by side along the ramen viaduct.

  Next, a plurality of overhang part formwork 5 are installed side by side along both sides of the ramen viaduct. In addition, the installation work of the overhang part mold 5 includes an inclined surface positioning process for positioning the inclined surface of the overhang part mold 5 and a mold installation process for installing the overhang part mold 5.

[Inclined surface positioning process]
As shown in FIG. 2, the inclined surface positioning step includes two types of support members having different heights corresponding to the inclined surface of the overhanging portion (the higher one is the first support) before the overhanging part formwork 5 is installed. This is an operation in which the lower one is referred to as the member 11, and the lower one is referred to as the second support member 12 in the width direction of the viaduct. The first and second support members 11 and 12 are erected on a rolling tower or the like, for example.

  The first and second support members 11 and 12 position the inclined surface of the overhang part formwork 5 on the tops 11a and 12a of the support member using a wedge-shaped plate 20 and a large pull 21. . That is, in the case of the first support member 11, as shown in FIG. 3, the plate 20 is fixed to the top portion 11 a of the support member, the large pull 21 is fixed on the fixed plate 20, and the top portion of the large pull 21 is The inclined surface of the overhang part mold 5 is positioned by being brought into contact with the inclined surface of the overhang part mold 5. Similarly, in the case of the second support member 12, the plate 20 is fixed to the top portion 12 a of the support member, the large pull 21 is fixed on the fixed plate 20, and the top portion of the large pull 21 is extended to the overhang part formwork. The inclined surface of the overhang part mold 5 is positioned in contact with the inclined surface 5.

  Note that the inclined surface positioning step does not use the overhang part mold 5 from the beginning, but uses an adjustment member 13 that has been adjusted in advance to the inclined surface (inclination angle) of the overhang part mold 5 as shown in FIG. Use.

  The adjustment member 13 has a triangular prism shape whose cross-sectional shape is a right triangle, and is formed such that one of the inner angles at both ends of the hypotenuse facing the right angle of the right triangle coincides with the inclination angle of the inclined surface. Yes.

  Then, the adjusting member 13 is installed on a surface forming one of the two sides forming the right angle of the right triangle to maintain a horizontal state, and at the same time, an inclination that forms the hypotenuse of the adjusting member 13 The first and second support members 11 and 12 are positioned using the surface as a ruler. When positioning the lowermost part of the adjustment member 13, for example, as shown in FIG. 2, using the reinforcing bar 41 of the central mold 4, a prepared alignment bar 42 is prepared in advance. 13 is fixed at the position of the reinforcing bar 41 having a height corresponding to the position of the lowermost part of the 13 and the lowermost part of the adjusting member 13 is positioned on the basis of the crosspiece 42.

[Formwork installation process]
When the positioning of the first and second support members 11 and 12 (inclined surface positioning step) is completed based on the hypotenuse of the adjustment member 13, the positioning is performed on the first and second support members 11 and 12 that have been positioned. As shown in FIG. 1, the overhang part formwork 5 is installed with the inclined surfaces of the overhang part formwork 5 aligned with each other.

  When the process of installing the precast formwork (the center part formwork 4 and the overhanging formwork 5) on the upper side of the girder 3 is completed, the concrete is placed in the precast formwork 4 and 5, and the RC slab 6 is precast concrete slab. Build as.

  According to this embodiment, when the RC slab 6 including the overhanging portion is formed by using the precast molds 4 and 5, the first and first in the inclined surface positioning step before the overhanging portion moldwork 5 is installed. 2 By positioning the inclined surface of the overhang part mold 5 with the support members 11 and 12, construction work of the overhang part mold 5 can be performed quickly with high accuracy. Moreover, since the RC slab 6 can be constructed using a precast formwork, it can be constructed safely and easily even when an installation site such as a scaffold or a temporary support cannot be secured. Further, the precast molds 4 and 5 having this configuration can be embedded precast molds which do not need to be detached, or can be partially precast molds.

  Further, according to this embodiment, the adjustment work 13 is used during the inclined surface positioning process, so that the installation work of the erection support (first and second support members 11 and 12) for supporting the overhanging portion can be performed with high accuracy. And it can be done in a short time.

  Further, according to this embodiment, conventionally, when the bottom surface of the projecting portion having an oblique shape is supported by the support as it is, it becomes unstable because it is supported by a point, but is fixed to the wedge-shaped plate 20. By using the large pull 21, it is possible to stably support the bottom surface of the overhang portion mold 5.

  Furthermore, the precast formwork (projecting part formwork 5) used in the construction method for the ramen viaduct according to this embodiment is integrally formed by connecting the balustrade member 7 vertically suspended with respect to the RC slab 3. Therefore, by precasting and integrating the formwork of the balustrade and the overhanging portion, it is possible to avoid troublesome work such as bar arrangement that has been conventionally performed separately.

  Furthermore, the precast formwork used in the construction method for the ramen viaduct according to this embodiment is one or more reinforcing materials selected from the group of steel fiber, stainless fiber, aramid, vinylon, carbon fiber, and glass fiber. As a result, the weight of the precast formwork can be reduced.

  In this embodiment, the intermediate part formwork 4 and the overhang part formwork 5 are described as being made of concrete, but the intermediate part formwork 4 and the overhanging part formwork 5 may be made of mortar. Further, in this embodiment, the precast mold has been described in the case where a reinforcing material selected from the group of steel fibers, stainless fibers, and the like is mixed, but the precast mold of the present invention has the reinforcing material described above. It is not limited to the case where is mixed, and the case where the reinforcing material is not mixed is also included in the present invention.

It is a schematic explanatory drawing of the construction method of the ramen viaduct concerning this invention. It is a figure which shows the procedure which adjusts the inclination-angle of a mount frame using a support. FIG. 3 is a detailed view of part A in FIG. 2. It is a front view of a ramen viaduct.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bridge pier part 2 Foundation girder part 3 Girder part 4 Middle part formwork 5 Overhang part formwork 6 RC slab 7 Handrail (handrail member)
11 First support member 11a Support receiver 12 Second support member 12a Support receiver 13 Adjusting member 14 Horizontal machine 20 Plate 21 Large pull 41 Reinforcement bar 42 Crosspiece 51 Truss bar

Claims (4)

In the construction method of the ramen viaduct that constructs the bridge pier and girder, installs the formwork in this girder and casts concrete to construct the RC slab,
The RC slab includes a projecting portion that projects in the width direction of the ramen viaduct and has an inclined surface at the bottom, and the RC slab including the projecting portion is formed using a precast formwork. ,
Before installing the precast formwork, the inclined surface position that locates the inclined surface of the precast formwork by arranging support members having different heights aligned with the inclined surface of the overhanging portion in the width direction. A dispensing process;
On said support member for the positioning was performed, seen including and a mold installing step of installing the precast mold together the inclined surface portion,
In the inclined surface positioning step, the cross-sectional shape is a triangular prism shape forming a right triangle, and one of the inner angles at both ends of the hypotenuse opposite to the right angle of the right triangle coincides with the inclination angle of the inclined surface. Using the adjustment member,
When the adjustment member is installed so that the surface forming one of the two sides forming the right angle of the right triangle is horizontal, two or more kinds of inclined surfaces forming the oblique sides of the adjustment member are used as a ruler. A construction method of a ramen viaduct characterized by positioning a support member . In the inclined surface positioning step, a wedge- shaped plate and a large pull are used,
The plate is fixed to the top of the support member, the large pull is fixed on the fixed plate, and the top of the large pull is brought into contact with the inclined surface of the overhanging portion so that the inclined surface of the precast formwork The construction method of the ramen viaduct according to claim 1 , wherein the positioning is performed. The said precast formwork used with the construction method of the ramen viaduct according to claim 1 or 2 is characterized in that a balustrade member vertically suspended with respect to the RC slab is connected and integrally molded. Precast formwork. The precast formwork according to claim 3 , wherein the precast formwork excluding the balustrade member is mixed with a reinforcing material selected from the group of steel fiber, stainless steel fiber, aramid, vinylon, carbon fiber, and glass fiber.

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