JPH0612008B2 - Concrete frame and its construction method - Google Patents

Description

Description: [Industrial field of application] The present invention relates to an improvement of a concrete method frame formed in the ground when constructing a slope protection structure.

[Conventional technology]

Conventionally, slope protection structures with various structures have been constructed in order to prevent collapse of slopes facing residential land and roads and to ensure safety.Examples of typical concrete slope frames for that purpose Are shown in FIGS. 3 and 4.

In the figure, a concrete method frame 1 has reinforcing bars 3 arranged vertically and horizontally on the slope of the ground, and wire meshes 2 are arranged so as to sandwich both sides of the reinforcing bars 3 to form a mold. It is formed by placing concrete 4. If necessary, each square of the law frame 1 is filled with crushed stone and the law frame 1
Has its surface finished with mortar 5.

In this way, by reliably spraying the concrete 4 or the mortar 5 onto the surface of the wire netting 2, the surface of the wire netting 2 is prevented from rusting, and thus the wire netting 2 is prevented from rusting.
It was thought that this wire netting 2 cooperated with the reinforcing bar 3 to reinforce the legal framework 1 most effectively.

[Problems to be Solved by the Invention]

However, mortar 4 and concrete 5 on the surface of the wire mesh 2
The overcoat thickness is naturally limited due to construction restrictions, and it is difficult to secure a sufficient thickness.

If these mortar 4 and concrete 5 cover thickness L ₁
When the rust prevention effect is surely aimed at by making it relatively hot to about 3 to 5 cm, the mortar and the like which is not yet hardened on the outside of the wire mesh 2 often peels off due to its own weight during the construction.

Further, even after the construction, the mortar or concrete may easily peel off due to the weight of the mortar or the like while being exposed to the weather.

For this reason, the covering thickness of mortar or the like is limited to about 5 mm, but the rust preventive effect of the wire netting 2 cannot be expected so much with such a covering thickness.

Furthermore, in order to obtain a tough slope protection structure, it is advantageous to use a wire mesh 2 having a high strength, which reduces the number of reinforcing bars 3 to be used and reduces the number of man-hours required for the reinforcement work. It is possible to avoid the increase and the resulting increase in construction cost. However, when a crimp wire net is used as the wire net 2, since this crimp wire net does not have sufficient strength, it is necessary to use a relatively large number of reinforcing bars 3 for reinforcement, which reduces the work of arranging. Was not fully achieved.

The present invention has been devised in view of the above problems,
When using a metal net phase for the formwork of the concrete method frame, semi-permanently prevent rusting of this net body,
It is an object of the present invention to provide a concrete method frame which has a low construction cost and a strong structure.

Another object of the present invention is to provide a method for efficiently and inexpensively constructing a concrete method frame having a relatively strong structure.

[Means for Solving the Problems]

In the present invention, the above object is achieved by a concrete method frame formed by forming a mold with expanded metal and coating the surface of the expanded metal with a synthetic resin material.

Another object of the present invention is to form a mold with expanded metal vertically and horizontally along the slope of the natural ground and coat the surface of this mold with synthetic resin, or coat the surface with synthetic resin beforehand. Forming a mold using the expanded metal, and then casting or spraying a concrete-based hardening material into the mold, more preferably, relatively mortar on the entire surface of the mold including the surface of the synthetic resin layer. Achieved by the method of constructing a concrete formwork by spraying thinly.

[Action]

In the concrete method frame according to the present invention, since the formwork is made of expanded metal, it is not easily broken even if external stress is applied to the entire method frame.

Moreover, since the surface of this expanded metal is covered with the synthetic resin layer, it does not rust semipermanently and its strength can be maintained. Therefore, concrete, mortar, etc. applied to the surface of the formwork can be maintained. Can be formed thinly.

In addition, it is not necessary to dispose a large number of reinforcing reinforcing bars even when constructing a method frame having a particularly strong structure.

〔Example〕

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2.

FIG. 1 shows a concrete frame 10 constructed for the purpose of protecting the slope, and FIG. 2 is a schematic sectional view showing the main part thereof.

The concrete method frame 10 includes a mold 12 made of expanded metal whose surface is covered with a synthetic resin 11, concrete 14 cast in the mold 12, and mortar 15 sprayed on the surface. It consists of
In this embodiment, reinforcing steel bars 16 are arranged in the mold 12.

The above-mentioned reinforcing bars 16 are arranged vertically and horizontally on the slope of the natural ground before forming the normal formwork 12, and reinforce the concrete formwork 10. In the present invention, since the formwork 12 is formed of expanded metal as described later, the concrete method frame 10 having a tough structure is constructed without using many rebars as in the conventional case. It

Therefore, the burden of the bar arrangement work on site is significantly reduced, and since a large number of bar arrangers involved in the bar arrangement work are not particularly required, it is possible to reduce building materials and labor costs.
Construction costs can be kept low.

The formwork 12 has both side surfaces along a rebar 16 laid on the slope to form a mold for placing concrete on the slope on which the concrete formwork 10 is to be constructed. An expanded metal is arranged so as to surround it to form a frame.

Here, a synthetic resin layer 11 is formed on the surface of the expanded metal. The synthetic resin used in this embodiment is an epoxy resin, a polyester resin, a vinyl chloride resin, a phenol resin, or the like, and includes these synthetic resin curing agents.

Each of these synthetic resins is, for example, sprayed on the surface of the expanded metal in the state of a synthetic resin liquid dissolved in each solvent, or is coated by a means such as casting. In addition, the synthetic resin coating is expanded metal 1
It may be carried out as needed on a part of the surface thereof, such as only the front side or the back side of No. 2, but it is more preferable to cover the entire front and back surfaces of the expanded metal in terms of the rust preventive effect of the expanded metal 12.

Further, the synthetic resin to be coated may be subjected to a coating treatment by pressing an uncured synthetic resin plate against the surface of the expanded metal and then curing it by heating or the like.

As described above, the type of the synthetic resin coated on the expanded metal is not particularly limited, and an appropriate means can be selected for the coating treatment depending on the construction procedure and the cost.

As described above, the mold 12 is formed by using the expanded metal coated with the synthetic resin 11, and the concrete 14 is then placed in the mold 12, and the mortar 15 is sprayed on the surface of the mold 14. A surface finish is made.

Here, the surface of the expanded metal forming the mold 12 is coated with the synthetic resin 11 as described above, and is subjected to rust prevention treatment. Therefore, the formwork 12
The overburden thickness L ₂ of concrete or mortar applied to the surface side of the can be made significantly smaller than the conventional overburden thickness L ₁ (see FIG. 4).

As a result, concrete or the like that has been cast or sprayed thickly on the surface of the formwork 12 during the construction will be peeled off by its own weight while being in an uncured state, or exposed to wind and rain after construction, and with that weight. Peeling is effectively prevented.

Next, a method of constructing the concrete method frame 10 according to the present invention will be described.

Reinforcing bars 16 are arranged vertically and horizontally along the slopes of the ground where the slope protection structure is to be constructed.

At this time, the rebar 16 does not require a large number because the mold 12 to be described later is formed of expanded metal. Therefore, the work of arranging can be simplified and it does not necessarily require a large number of arranging workers.Therefore, the construction cost can be reduced in terms of labor cost and material cost compared with the construction of the conventional concrete method. obtain.

Next, the expanded metal is arranged so as to sandwich the reinforcing bar 16 from both side surfaces to form the mold 12.

At this time, an expanded metal may be arranged on the bottom of the mold 12 (not shown).

Next, the mold 12 is coated with a synthetic resin 11. Here, the synthetic resin to be coated is preferably an epoxy resin, a polyester resin, a vinyl chloride resin, a phenol resin, or the like, as in the above embodiment.

This synthetic resin layer may be formed by applying or spraying a synthetic resin liquid onto the mold 12, or before the synthetic resin is cured by heating or the like.
Various means such as pressing against the mold 12 can be selected.

After the synthetic resin coating 11 is hardened on the surface of the mold 12, concrete is placed in the mold 12, and if necessary, concrete, mortar, or the like 15 is sprayed on the surface to finish the surface.

Here, the covering thickness L ₂ of the mortar 15 or the like on the mold 12 may be about 5 mm to 10 mm at most, and even with such covering thickness, the expanded metal forming the mold 12 is covered with a synthetic resin. Therefore, it does not cause corrosion.

Moreover, by making the cover thickness L ₂ thin, it is possible to avoid the situation where the uncured concrete is peeled off by its own weight, and the amount of material concrete can be saved.

Further, the expanded metal is covered with a synthetic resin before the mold 12 is formed, and the expanded metal is carried to the site to form the mold 1.
You may make two.

〔The invention's effect〕

As described above, according to the present invention, the expanded metal is used for the form of the concrete method frame, and the expanded metal is coated with the synthetic resin. by this,
The covering thickness of concrete and mortar applied to the formwork can be reduced. As a result, these mortars and the like do not peel off due to their own weight.

Thus, according to the present invention, it is possible to semi-permanently prevent rusting of the mold, and to provide a concrete method frame having a tough structure in which concrete does not peel off, and a method for constructing the same.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing an embodiment of a concrete method frame according to the present invention, and FIG. 2 is a schematic sectional view of the concrete method frame of FIG. FIG. 3 is a schematic perspective view showing an example of a conventional concrete method frame, and FIG. 4 is a schematic sectional view of the concrete method frame of FIG. 10 ... Concrete method frame; 11 ... Synthetic resin layer; 12
... Expanded metal (form); 14 ... concrete; 15 ... mortar, etc .; 16 ... rebar.

Claims (4)

[Claims] 1. A mold is formed of expanded metal,
A concrete method frame, characterized in that the surface of the expanded metal is coated with a synthetic resin material. 2. A concrete method frame in which a mold is made of expanded metal, and a concrete-type hardening material is cast or sprayed into the mold, and the surface of the expanded metal is covered with a synthetic resin material. In addition, the concrete method frame is characterized in that a thin mortar layer is formed on the entire surface including the synthetic resin material layer. 3. A mold is formed of expanded metal on the slope of the natural ground and then the surface of the mold is coated with a synthetic resin, or
Alternatively, the concrete method is characterized in that a form is formed on the slope of the ground using an expanded metal whose surface is previously coated with a synthetic resin, and a concrete-type hardening material is placed or sprayed in the form in pairs. How to build a frame. 4. A mold is formed of expanded metal on the slope of the natural ground, and then the surface of the mold is coated with a synthetic resin, or
Alternatively, a mold is formed on the slope of the ground using expanded metal whose surface is previously covered with a synthetic resin, and then a concrete-based hardening material is placed or sprayed into the mold, and finally mortar finish is applied to the entire surface. A method of constructing a concrete method frame characterized by applying.