JP3202101B2 - Construction method of balustrade in concrete structure with balustrade - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of the structure of a high railing part in a viaduct or a bridge of a type comprising a reinforced concrete structure and having tall balustrades at both ends (hereinafter referred to as a high balustrade), and an improvement of a construction method thereof. More specifically, the present invention relates to a structure of a balustrade portion of the concrete structure and a method of constructing the balustrade portion, in which formability as a member forming the balustrade is left to improve workability of the balustrade portion.

[0002]

2. Description of the Related Art In concrete structures such as viaducts and bridges, balustrades are provided at both ends of a floor slab to ensure traffic safety. Many of these balustrades are so-called high balustrades, which are relatively tall for further security.

Referring to FIG. 9, a railing 2 extending in the longitudinal direction is integrally formed with a floor slab 3 at both ends of a concrete structure 1 such as a viaduct or a bridge. The railing 2
There are various shapes. In this example, a step 4 is formed at the base end of the balustrade 2, but as shown in FIG. 10, a balustrade 2A having no step is used. And a railing 2B having an inclined surface 5 as shown in FIG.
It can also be.

[0004] Such balustrades 2, 2A, 2B are slab 3
There are roughly two types of methods to be applied to the end of the.
In other words, the first method is to construct a formwork on the floor slab 3 and cast concrete into the formwork, and the second method is to install a precast bale railing block on the floor slab 3 at the site. It is a method of assembling and installing.

[0005] The second method using a precast balustrade block is not preferable in terms of strength and safety. At present, a formwork is provided, and concrete is poured into the formwork. The first method of forming a balustrade is often used.

Conventionally, the concrete of the balustrade 2 is cast and installed on both ends of the floor slab 3 as follows. That is, referring to FIG. 12, reinforcing bars 6 are previously installed at both ends of the floor slab 3 when the floor slab 3 is driven, and a formwork 7 is installed around the reinforcing bar 6. The installation and removal of the formwork 7 is performed by assembling the formwork by using a shoring and a scaffold 8 (hereinafter, these are referred to as scaffolds and the like) used when the floor slab 3 of the concrete structure 1 is cast into concrete. Has been removed.

As described above, according to the conventionally known construction method, after the concrete forming the balustrade is cured, the formwork 7 is removed and dismantled using the scaffolding 8, so that the work of removing the formwork 7 is performed. It is usual that the scaffolding 8 is left and placed only during this period, and the removal work is designed so that there is no danger of the worker falling down.

[0008] In the construction of the above-mentioned conventionally known railing 2, as shown in FIG.
End corner 7B, wooden cone 7C, washer 7D, separator 7E
The removal work takes time because many of these members must be removed.

[Problems to be solved by the invention]

[0009] The above-mentioned conventionally known method of constructing a balustrade has the following problems. First, in the construction process, the construction must be performed while the scaffolds 8 remain, and there are restrictions on the construction period, and the scaffolds 8 must remain during the curing period of the concrete on the balustrade. However, the period becomes longer by that amount, so that the period of the construction period becomes longer and the cost increases.

In addition, in the above-mentioned known method of constructing a balustrade, a scaffold or the like 8 is required, and a wooden form material 7A, a thick corner 7B, a wooden cone 7C, a washer 7D, and a separator 7E constituting the formwork 7 are required. Since many members are required, assembling and disassembling the formwork 7 also takes much time in this aspect.

In addition, concrete is exposed to the outside air and neutralized with the passage of time, and rust is generated on the buried reinforcing steel and expanded.
Cracks may occur on the concrete surface.

Further, when coloring or patterning a balustrade,
Coloring work and pattern setting work must be performed after the balustrade is made of concrete, and there are difficulties in performing these works on site, and the construction period becomes long.

It is an object of the present invention to improve the drawbacks, eliminate the need for a scaffold or the like extending to the outside, and provide a railing structure with a high work efficiency and a method of constructing the railing.

[0014]

The structure of the balustrade, which is a feature of the present invention, is as follows. A construction method in which a reinforcing rail for a railing extending in the longitudinal direction is erected in advance at the end of the floor slab of the concrete structure, and a formwork is installed around the reinforcing bar and concrete is cast to form the railing. In the above, a form material made of glass fiber reinforced plastic divided into front and rear is placed on the reinforcing bar and arranged back and forth and joined, and then the side frame is pressed against the side pressure so that the installed form material does not shift in the front and rear direction. A member is installed, and subsequently, an uplift prevention member for preventing the form material from being lifted up is attached. Thereafter, concrete is poured from the upper surface of the form material, and after the concrete is cured, the lateral pressure counter-press member is attached. And remove the lifting prevention member,
. A method of constructing a balustrade portion in a concrete structure having a balustrade, wherein the formwork material is used as an outer surface of the balustrade by leaving the formwork material.

[0015]

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a railing according to an embodiment of the present invention. In the figure, a reinforcing bar 13 is provided upright at an end of a floor slab 12 of a concrete structure 11.
Is buried to form a balustrade K. The concrete horizontal structure 11 includes a concrete structure used for a viaduct, a bridge, an elevated road, an elevated expressway, etc., as well as a road having a side wall formed at both ends or a center. It is called. The balustrade K also includes a side wall. The formwork 14 remains on the outer surface of the balustrade K, and the balustrade K is formed integrally with the formwork 14. A reinforcing material 15 is provided on the inner surface of the formwork 14.
Are provided to improve the strength of the formwork 14. Reinforcement
15 is built into the inner surface of the formwork 14, and the formwork is
Anything that reinforces it may be used. Note that the reinforcing member 15 is not necessarily indispensable, and may be omitted depending on the strength of the formwork 14. The present invention includes a member in which the reinforcing member 15 is omitted. The outer surface of the mold 14 is colored or patterned as necessary. This coloring or pattern is desirably added when the mold is manufactured at a factory.

Next, a method for constructing the railing according to the present invention will be described. FIG. 2 is a perspective view showing an embodiment of the form material used in the present invention, and FIG. 3 is a perspective view showing the inside of the form material of FIG. FIG. 4 is a perspective view showing a formwork according to one embodiment of the present invention in a state where the formwork is assembled to an end of a floor slab. FIG. 5 is a cross-sectional view showing an end portion of the floor slab before the form material is assembled.

Referring to FIG. 5, concrete structure 11
At the end of the floor slab 12, a reinforcing bar 13 extends in the longitudinal direction and is erected in advance. The reinforcing bars 13 are installed and placed in advance when the floor slab 12 is cast into concrete, and are buried only near the lower end at the same time as the concrete is laid on the floor slab 12.

Referring to FIGS. 2-4, the formwork 14 used in the method of the present invention comprises two formwork pieces 14A, 14B which are joined together. A reinforcing material 15 is provided on the inner surfaces of the formwork pieces 14A and 14B, and a charging opening 16 for charging concrete after the setting is provided on the upper surface. The shape of the opening 16
The shape is not limited to the shape shown in FIG.
Including a shape that opens like a slit over almost the entire surface of
It is.

The form member 14 is made of a suitable material such as glass fiber reinforced plastic, reinforced concrete, reinforced plastic, corrosion resistant metal, etc., and is manufactured in advance in a factory and then carried to the site. Of these materials,
Glass fiber reinforced plastic is strong, elastic, portable, etc.
It is a preferable material in view of the above.

The method of casting concrete using the formwork material 14 and constructing the railing of the present invention is as follows. First, the form members 14A and 14B are installed facing both sides of the reinforcing bar 13 and temporarily joined. In this case, the form materials 14A and 14B may be combined and the combined form material 14 may be put on the reinforcing bar 13, or the form materials 14A and 14B may be separately installed before and after the reinforcing bar. May be combined after each other. Then, the longitudinal end of the mold 14 is closed by the end plate 17.

The side pressure of the concrete put into the form member 14 acts on the form member 14. Therefore, the side pressure counter-holding member 18 is installed so that the form member 14 does not shift in the front-rear direction. The inner shape of the side pressure counter-holding member 18 is the form material 1
It is almost the same shape (slightly larger) as the outer shape of 4.
It is provided in contact with the front surface, the upper surface, and the rear surface of the form member 14. After placing a lateral pressure against the pressing member 18, the lateral pressure against the pressing member 18 from rattling pressing the lateral pressure against the fixing member 19 such as a wedge to prevent the member 18
Placed between the mold member 14 surface.

Subsequently, the adjusting member 20 is formed by a square bar, belt, pipe, or the like extending in the longitudinal direction so that the form member 14 is arranged in a predetermined linear shape (for example, a straight line or a slightly curved circle). Attach. The street adjusting member 20 is fixed to the side pressure counter-holding member 18 by the stopper 21.

Further, as shown in FIG. 6, a lifting prevention metal fitting 22 is provided to prevent the form material 14 from lifting upward.
Install. The lifting prevention fitting 22 is made of a plate-like body made of a predetermined material (metal, reinforced plastic, or other metal-reinforced wood). 14 is installed in contact with the upper surface of the substrate 14.

A fine adjustment nut 23 is screwed onto the upper surface of the lifting prevention member 22, and the fine adjustment nut 23 is rotated to finely adjust the gap between the upper surface of the form member 14. Further, as the adjustment member and the fine adjusting member 24 as to adjust the position of 20 is provided, as through adjustment member 20 by rotating the street fine adjustment member 24 is attached at a predetermined linear state fine adjust. In this embodiment, the street fine adjustment member 24 includes a screw portion 24A connected to the street adjustment member 20, a screw portion 24B connected to an anchor 25 embedded in the floor slab 12, and the two screw portions 24A. 24B and a cylindrical screw member 24C that is screwed together. The position of the adjusting member 20 is adjusted by rotating the cylindrical screw member 24C.

When the above operation is completed, concrete is poured from the concrete charging opening 16 and the lateral pressure counter-pressing member 1 is left after the cultivation survival period has elapsed.
8 and the lifting prevention member 22 are removed. Since the removal work of the side pressure opposing holding member 18 and the lifting prevention member 22 can be performed on the floor slab 12 without a scaffold, it can be performed simply, safely, and quickly.

In the above embodiment, no step is formed on the balustrade. However, when a form member 14C as shown in FIG. 7 is used, the step part 14D of the form member 14C causes the step part of the balustrade to be formed. Can be formed, which is also included in the present invention. Note that the step portion 14D is formed by
In addition to the front and rear surfaces of C, a step is formed only on the front surface of the formwork material 14C.
The structure including the portion 14D is also included.

When the form member 14E shown in FIG. 8 is used, the slope of the balustrade can be formed by the slope portion 14F of the form member 14E, which is also included in the present invention. In addition, the slope part 14F is in front of the formwork material 14E.
In addition to being provided on the rear surface, the slope portion 14 is provided only on the front surface of the form material 14E.
The structure including F is also included.

[0029]

As described above, according to the present invention, the following effects can be obtained. Since all work can be done on the floor slab, external scaffolding is not required and it is safe. In addition, the period during which the external scaffold remains remains short, which is economical. Since the work process is simple, efficiency is improved and workability is improved. Furthermore, since the concrete surface is covered with the formwork, the concrete is not directly exposed to the outside,
Therefore, cracks due to neutralization of concrete do not occur. For this reason, a beautiful appearance can be obtained over a long period of time.

In the case where the outer surface of the formwork is colored or patterned in advance, the process of coloring or patterning is simplified , and in this regard, the construction period can be shortened and the quality of the high balustrade does not deteriorate.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a structure of a balustrade according to an embodiment of the present invention.

FIG. 2 is a perspective view of a form member according to one embodiment of the present invention.

FIG. 3 is a perspective view showing an inner surface of the form member of FIG. 2;

FIG. 4 is a perspective view illustrating a construction method of the present invention.

FIG. 5 is a cross-sectional view showing an end portion of a floor slab in a state before construction of a railing according to the present invention.

FIG. 6 is a sectional view showing a construction method of the present invention.

FIG. 7 is a perspective view showing a form member according to another embodiment of the present invention.

FIG. 8 is a perspective view showing a form member according to still another embodiment of the present invention.

FIG. 9 is a perspective view showing a known balustrade.

FIG. 10 is a perspective view showing another known balustrade.

FIG. 11 is a perspective view showing still another known balustrade.

FIG. 12 is a perspective view for explaining a conventionally known method of constructing a railing.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 11 Concrete structure 12 Floor slab 13 Reinforcement 14 Form material 15 Reinforcement material 16 Concrete introduction opening 17 End plate 18 Side pressure countering member 19 Fixing member 20 Street adjusting member 21 Stopper 22 Floating prevention member 23 Fine adjustment nut 24 Fine adjustment Member 25 Anchor

Claims (8)

(57) [Claims] 1. A railing for a balustrade extending in the longitudinal direction is previously erected at an end of a floor slab of a concrete structure, a formwork is installed around the reinforcing bar, concrete is poured, and a balustrade is cast. In the construction method of forming, a form material made of glass fiber reinforced plastic divided into front and rear is placed on a reinforcing bar and arranged in front and rear and combined, and then the installed form material does not shift in the front and rear direction. Install the side pressure counter-holding member as follows, and then attach an uplift prevention member to prevent the form material from rising upward, and then cast concrete from the concrete input port on the top surface of the form material, After curing of the concrete, remove the lateral pressure resistance holding member and lifting prevention member,
. A method of constructing a balustrade portion in a concrete structure having a balustrade, wherein the formwork material is used as an outer surface of the balustrade by leaving the formwork material. 2. A balustrade according to claim 1, wherein a fixing member is provided between the lateral pressure counter-holding member and the surface of the formwork material to prevent rattling of the side pressure counter-pressing member. Construction method of a railing part in a concrete structure having a crack. 3. The method according to claim 2, wherein the fixing member comprises a wedge. 4. A balustrade in a concrete structure having a balustrade according to claim 1, wherein an adjusting member is provided so as to extend in the longitudinal direction so that the formwork material is arranged in a straight line. Construction method of the part. 5. A concrete structure having a balustrade according to claim 1, wherein a fine adjustment nut is attached to the lifting prevention member, and the fine adjustment nut is rotated to finely adjust the height. Construction method of high balustrade part. 6. A fine adjustment member is provided to adjust the position of the street adjustment member, and the fine adjustment member is operated to finely adjust the street adjustment member so as to be mounted in a predetermined linear state. The method for constructing a balustrade portion in a concrete structure having a balustrade according to claim 4 or claim 5. 7. The construction method of a balustrade in a concrete structure having a balustrade according to claim 1, wherein a reinforcing material is provided on an inner surface of the formwork. 8. The method according to claim 1, wherein the outer surface of the formwork is previously colored, patterned, or the like.