JPH108429A - Structure of concrete protection fence and construction method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure of a protection fence, by which construction work at a job site can be conducted easily and in a short term, field work can be conducted even if the weather is a little bad, and further construction can be performed without removal of existing guard rails, box beams and the like. SOLUTION: A required number of precast concrete slabs 21 having a a part of a reinforcement bar 22 projected from the back are arranged along a protection fence installation line 62 of a road in such a manner than the backs thereof are opposite to each other. The reinforcement bar 22 projected from the back of the precast concrete slub 21 is buried in concrete 25 filled in a space between the backs of the opposite precast concrete slub 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete protection fence structure and construction method.

[0002]

2. Description of the Related Art In recent years, concrete guard fences have been provided on highways and highways in place of conventional guard rails, guard cables, box beams, and the like. This is due to the problem that a vehicle running at high speed or a large vehicle breaks through a guardrail or the like and entrains vehicles on the opposite lane.

Conventionally, as a method of constructing the concrete protective fence, there are a slip form method and a formwork method in which concrete is directly poured on site, and a precast method in which a concrete block for the protective fence is previously formed in a factory.

[0004] In the slip-form construction method, after arranging reinforcing members along a road protective fence installation line (hereinafter referred to as a length direction having a protective fence installation width in the present specification),
This is a method of placing concrete between formwork that slides along the reinforcing bars to form a protective fence, and the formwork method involves placing concrete between formwork fixed to the protective fence installation line on the road. After the concrete is hardened, the formwork is removed to form a protective fence. On the other hand, the precast method is a method in which a required number of concrete blocks for protective fences formed at a predetermined length in a factory are transported to a site and connected to a required number of road protective fence installation lines and fixed.

[0005]

However, in the slip form method and the formwork method, foundation work, reinforcing steel work, concrete casting and curing are required at the construction site, and if the construction work is cumbersome, In addition, there is a problem that road lanes must be restricted for a long time for construction. In addition, in the slip form method,
Since the formwork does not exist immediately after the concrete is cast, it requires a hardening concrete material made of a special material, etc., and it may be difficult to perform the work due to a slight weather defect. There is a problem that extra installation and removal work is required.

[0006] On the other hand, in the precast method, since one concrete block for protective fence has a length of 3 to 5 m and is heavy, there is a problem that the transportation to the site and the construction at the site are troublesome and costly. .

Further, in the precast method, when a concrete protective fence is provided on a road surface on which a guardrail or a box beam is already provided, the guardrail or the box beam must be removed from the road surface first, and the removal work is required. There is a problem that an additional cost and period are required.

[0008] The present invention has been made in view of the above points, the construction work is easy, the work can be done on site even in the case of a little bad weather, the construction period at the site can be shortened, furthermore, the existing guardrail, box beam, etc. It is an object of the present invention to provide a concrete protection fence structure and a construction method which can be constructed without removing them even if they exist.

[0009]

According to the first aspect of the present invention, a required number of precast concrete slabs, in which a part of a reinforcing member protrudes from the back side, are installed such that the back sides thereof are opposed to each other, and a required number of road protective fence installation lines are provided. And a reinforcing member protruding from the back side of the precast concrete slab is buried in concrete filled in the space behind the opposing precast concrete slab.

In the structure according to the first aspect of the present invention, precast concrete slabs constituting both outer sides of the concrete protection fence are manufactured in advance in a factory, transported to a construction site, and arranged on a protection fence installation line at the construction site. After that, concrete protection fences can be formed by filling (casting) concrete into the space behind the precast concrete slab, which simplifies the work of filling concrete at the site and reduces the work time and curing time. In addition, since the precast concrete slab acts as a formwork, no special formwork is required, and on-site construction is possible even in a slightly bad weather. Moreover, the precast concrete slab used here is an outer surface side portion of the concrete protection fence, and corresponds to one in which the outer surfaces of the concrete protection fence are divided into three (not limited to three equal parts). Compared to the concrete block used in the precast method, it is lighter and easier to transport to the site and handle at the site.

According to a second aspect of the present invention, in the first aspect, road supplementary equipment such as a guardrail and a box beam erected on a protection fence installation line of the road is provided together with a reinforcing member protruding from the back side of the precast concrete slab. It is characterized in that it is configured as a reinforcing member for the protective fence. This claim 2
In the structure of the invention of the present invention, since the concrete protection fence can be provided without removing the existing box beam, guard cable, etc., the construction work is easy and simple, and the effect of reducing the cost of the reinforcing material is also effective. .

On the other hand, according to the invention of claim 3, the required number of precast concrete slabs, in which a part of the reinforcing material projects from the back side, are arranged side by side on the protective fence installation line of the road so that the back sides face each other. After being connected by a connecting member, a concrete protection fence comprising filling the concrete in the space on the back side of the opposing precast concrete slab and forming a concrete protection fence having the precast concrete slab as an outer surface is provided. . This claim 3
In the construction method of the present invention, as in the second aspect, the work of filling concrete at the site is simplified, the work time and the curing time are shortened, and the site construction can be performed even with a little bad weather. Furthermore, the precast concrete slab used is lighter in weight than the concrete block used in the conventional precast method, and is easy to transport and handle on site.

According to a fourth aspect of the present invention, a pair of the precast concrete slabs according to the third aspect is connected at the reinforcing member portion at an appropriate interval so that the back sides thereof are opposed to each other in advance, and the connected portions are connected. A required number of precast concrete slabs are arranged side by side on a protective fence installation line on a road, and concrete is filled in a space behind the opposing precast concrete slabs. Claim 4
In the invention of the above, in a state where a pair of precast concrete slabs are connected in advance so that the back sides are opposed to each other, they are arranged side by side on the protective fence installation line of the road, so that the installation work is simplified and the work time is shortened .

According to a fifth aspect of the present invention, in accordance with the third or fourth aspect, the precast concrete slab is positioned across a road-related facility such as a guardrail or a box beam erected on a road protection fence installation line, The backside space of the precast concrete slab is filled with concrete. According to the fifth aspect of the present invention, since it is not necessary to remove the existing guardrails, box beams, and the like, the operation is further simplified, and the construction period is shortened.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the accompanying drawings. 1 is a perspective view of a concrete protective fence according to an embodiment of the present invention, FIG. 2 is an enlarged sectional view of the embodiment, FIG. 3 is a sectional view of a concrete protective fence of another example, and FIG. FIG. 5 is a perspective view showing an example of the construction method of the protective fence, FIG. 5 is a cross-sectional view showing the state when concrete is filled in the embodiment, FIG. 6 is a cross-sectional view showing another example of the construction method of the concrete protective fence, and FIG. It is sectional drawing which shows the construction method of an example.

The structure of the concrete protective fence of the present invention is as follows.
As shown in FIGS. 1 and 2, a precast concrete slab (hereinafter referred to as a PC slab) 21, 21 from which a part of a reinforcing member 22 protrudes from the back side, is attached to the back fence of the road 61 so that the back sides face each other. Placed side by side on the installation line 62,
In the concrete 25 filled between the opposing PC plates 21, 21, reinforcing members 22, 22 protruding from the back side of the PC plates 21, 21 are buried, and the concrete 25 filled with both PC plates 21, 21 is filled. It has an integrated structure.

The PC plate 21 constitutes the outside of the target concrete protection fence 10 and has the outer shape of the concrete protection fence 10. Each dimension of the PC plate 21 has a thickness smaller than half of the thickness of the concrete protection fence 10 and a height substantially equal to the height of the concrete protection fence 10. The length is determined in consideration of the ease of handling of the PC plate 21 itself, workability, and the like. As an example,
The height is 1100 mm and the length is 5000 mm. A reinforcing member 22 of a required shape is embedded in the PC plate 21 with a part thereof protruding from the back side of the PC plate 21.

The reinforcing member 22 reinforces the PC plate 21 and strengthens the connection between the concrete 25 filled between the PC plates 21 and the PC plates 21, 21 to obtain the concrete protective fence obtained. 10 to increase the strength.

As shown in FIG. 2, connecting members 27 and 28 for preventing the gap between the PC plates 21 and 21 from being disturbed when the concrete 25 is filled. Are attached above and below the reinforcing members 22, 22 facing each other. As the connecting members 27 and 28, appropriate ones are used. For example, a metal rod having hooks at both ends or a bolt member having a hook at the tip is screwed to both ends of the turnbuckle to turn the turnbuckle. In some cases, the hook interval changes due to the rotation of.

When the structure of the present invention is applied to a road surface on which road-related facilities such as guardrails and box beams are already provided, as shown in FIG. 3, the road-related facilities 65 such as guardrails are sandwiched. PC version 21B, 21
B is located, and the road auxiliary equipment 65 is buried in the concrete 25B filled in the space behind the PC plates 21B, 21B. Thereby, it is not necessary to remove the road auxiliary equipment 65 from the protective fence installation line 62B of the road 61B, and the road auxiliary equipment 65 can be used as a part of the reinforcing member for reinforcing the protective fence.
It also helps to reduce the cost of bar arrangements. Reference numeral 22B is a reinforcing material, 2
7B and 28B are connecting members.

Next, an example of a construction method for the concrete protective fence having the structure shown in FIGS. 1 and 2 will be described. 1 and 2 are denoted by the same reference numerals.

First, as shown in FIG. 4, the PC plates 21 and 21 having the above structure are placed on a protective fence installation line 62 on a road 61.
The rear sides are opposed to each other, and a required number is arranged side by side with a predetermined gap left between the rear sides. As the PC versions 21 and 21, those manufactured in advance at a factory are carried to the site and used. At this time, since each of the PC plates 21 and 21 is an outer surface portion on one side of the concrete protection fence, it is much lighter and easier to handle than the concrete block in the conventional precast method, thereby facilitating the construction work. The connecting members 27, 28 are provided above and below the reinforcing members 22, 22 projecting from the back sides of the PC plates 21, 21 arranged opposite to each other at predetermined intervals along the length direction of the PC plates 21, 21. (Shown in FIG. 5)
Is attached.

Next, as shown in FIG.
If the back side of 21 is filled with concrete 25 and then cured and cured, a desired concrete protective fence can be obtained. Since the work at that time is to fill the narrow space between the back sides of the PC plates 21 and 21 with the concrete 25, the slip protection method or the formwork in which the entire concrete protective fence is formed by casting concrete at the construction site. Unlike the construction method, the amount of concrete filling (placed amount) is small, and the filling work and curing are easy and short. In addition, since the PC plate 21 also functions as a mold, the work can be performed even if the weather is slightly poor. In addition, since there is no need to dismantle the formwork, this also simplifies the construction work.

In the concrete protective fence formed in this manner, reinforcing members 22, 22 projecting from the back side of the PC plates 21, 21 are provided in the concrete 25 integrated with the PC plates 21, 21. PC because it is buried
The connection between the plates 21 and 21 and the concrete 25 is strong, and the strength of the protective fence is high.

The PC plates 21 and 21 are connected in advance at a factory or the like by connecting members 27 and 28 such that the back sides face each other as shown in FIG.
1 and 21 may be suspended by a crane or the like and arranged side by side on a protective fence installation line 62 of a road 61. By doing so, on-site construction becomes simpler, construction time can be shortened, and it is particularly suitable when construction is urgent. Even in this case,
The pre-connected PC plates 21 and 21 have a space between the back sides and are extremely lighter than the concrete blocks in the conventional precast method, so that the construction work is easier than in the conventional method.

As shown in FIG. 3, when there is a road supplementary facility 65 such as a guard rail or a box beam on the concrete protection fence installation line 62B, the PC plate 21B is disposed on the protection fence installation line 62B. 7, the PC plates 21B, 21B are positioned across road-related facilities 65 such as guardrails, and the P
Concrete may be filled between the C-plates 21B, 21B. Then, it is not necessary to remove the road auxiliary equipment 65.

[0027]

As shown and described above, in the structure of the concrete protective fence according to the first aspect of the present invention, a precast concrete slab manufactured in advance in a factory can be used. Since each of them constitutes one outer surface portion of the concrete protection fence, it is extremely lightweight unlike the concrete block used in the conventional precast method. Therefore, the work of transporting the precast concrete slab to the site and the handling at the site become easy. further,
The on-site concrete filling (casting) work can be completed by filling the back space of the opposing precast concrete slab, simplifying the on-site work, shortening the concrete curing time, and shortening the on-site work period. On-site work is possible even in some bad weather.

Further, in the structure of the concrete protective fence according to the second aspect of the present invention, in addition to the effect obtained by the first aspect of the present invention, in the case where auxiliary equipment such as a guard rail already exists on the protective fence installation line. However, there is no need to remove the auxiliary equipment, and there is an effect that the construction work at the site is extremely simplified and the construction period is shortened while saving the reinforcing material.

On the other hand, in the construction method of the concrete protective fence according to the third aspect of the invention, the construction on site can be performed simply and easily and in a short period of time, similarly to the effect of the first aspect of the invention. The effect is that the construction can be performed even in some bad weather. In the method for constructing a concrete protective fence according to the invention of claim 4, since the precast concrete slabs are handled in a state where they are connected to each other in advance,
There is an effect that construction on site is easier. Further, in the method for constructing a concrete protective fence according to the invention of claim 5, in addition to the effects of the invention of claim 3 or the invention of claim 4, an additional facility such as a guard rail already exists on the protective fence installation line. Even in this case, there is no need to remove the auxiliary equipment, so that the construction work at the site can be extremely simplified and the construction period is shortened.

[Brief description of the drawings]

FIG. 1 is a perspective view of a concrete protective fence according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of the embodiment.

FIG. 3 is a cross-sectional view of another example of a concrete protective fence.

FIG. 4 is a perspective view showing an example of a method for constructing a concrete protective fence of the present invention.

FIG. 5 is a cross-sectional view showing the same example when concrete is filled.

FIG. 6 is a sectional view showing another example of a method for constructing a concrete protection fence.

FIG. 7 is a cross-sectional view showing a construction method of still another example.

[Explanation of symbols]

 21, 21B: Precast concrete slab 22, 22B: Reinforcing material 25, 25B: Concrete 27, 28: Connecting member 62, 62B: Protective fence installation line 65: Road auxiliary equipment

Claims (5)

[Claims] 1. A required number of precast concrete slabs in which a part of a reinforcing material projects from the back side are arranged side by side on a protective fence installation line of a road so that the back sides thereof face each other, and the opposing precast concrete slabs are arranged. A structure of a concrete protection fence characterized by burying a reinforcing member protruding from the back side of the precast concrete slab in the concrete filled in the back space of (1). 2. Ancillary equipment such as guardrails and box beams erected on the protective fence installation line of the road,
The structure of the concrete protective fence according to claim 1, characterized in that it is configured as a reinforcing fence reinforcing material together with a reinforcing material protruding from the back side of the precast concrete slab. 3. A required number of precast concrete slabs, in which a part of the reinforcing material projects from the back side, are arranged side by side on a protective fence installation line of a road so that the back sides thereof face each other, and are connected by a connecting member. A method for constructing a concrete protection fence, comprising filling concrete in a space on the back side of the opposing precast concrete slab to form a concrete protection fence having the precast concrete slab as an outer surface. 4. A pair of precast concrete slabs, in which a part of the reinforcing material projects from the back side, are connected at the reinforcing material part at appropriate intervals so that the back sides face each other, and the connected parts are connected. Arranging the required number of precast concrete slabs side by side on the protective fence installation line of the road, filling the space behind the opposing precast concrete slabs with concrete, and forming a concrete protective fence having the precast concrete slab as an outer surface. Characteristic construction method of concrete protection fence. 5. A method in which a precast concrete slab is positioned across a road incidental facility such as a guard rail or a box beam erected on a protective fence installation line of a road, and the space behind the precast concrete slab is filled with concrete. The construction method of the concrete protective fence according to claim 3 or 4, wherein