JPH0628572Y2 - Concrete block for building - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a concrete block for construction, such as a hollow concrete block or a formwork concrete block,
In particular, the present invention provides a concrete block having excellent rainwater infiltration prevention and heat insulation properties.

(Prior Art) In order to give a waterproofing function to a concrete building block itself, a concrete building block having three face shells has come to be used. That is, the first face shell and the second face shell on the front side are connected by a plurality of relatively small first web shells to form a relatively small auxiliary cavity between the first and second face shells,
The second face shell and the rear side third face shell are connected by a plurality of relatively large second web shells to form a relatively large main cavity between the second and third face shells, and stacking is performed. Later, fresh concrete was poured into this main cavity, leaving the sub-cavity on the front side as a cavity so that rainwater that entered from the outside could be drained from the sub-cavity. When the blocks are stacked, the upper and lower sides of the second face shell and the third face shell are sealed with joint mortar, the upper and lower sides of the first face shell are sealed with watertight packing, and the left and right sides thereof are It has a structure in which the intrusion pressure of rainwater is reduced by the orifices formed in two stages in the front and rear.

(Problems to be solved by the invention) However, the conventional concrete block for construction is
Natural aggregate such as sand, gravel and crushed stone, cement and water are mixed at an appropriate ratio, the obtained mortar is supplied to a molding machine and compression molded, and this molded product is cured at a predetermined temperature for a predetermined time. Since it is manufactured by the above method, the compressive strength is less than 350 kg / mm ² and the width of the first web shell connecting the first face shell and the second face shell cannot be made too small. The concrete layer using aggregate is
Since the thermal conductivity is comparatively high and is 0.9 to 1.2 Kcal / mHr ° C, there was a problem that the heat insulating property as a concrete block for construction becomes insufficient.

This invention uses the material having large compressive strength and small thermal conductivity before and after the first web shell,
The width of the first web shell can be narrowed, and the heat conductivity of the concrete block is improved in combination with the decrease in the thermal conductivity thereof.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides first, second, and
A third face shell and first and second web shells connecting them are formed, and a relatively small sub-cavity is formed by the front first and second face shells and the first web shell. In a concrete block for construction in which a relatively large main cavity is formed by the second and third face shells on the rear side and the second web shell, at least from the middle of the thickness direction of the second face shell to the thickness direction of the first face shell Up to the middle is formed by a concrete layer with chamotte brick fragments as aggregate, and the rest is sand,
It is formed of a concrete layer containing natural aggregate such as crushed stone and gravel.

The crushed pieces of chamotte brick are classified into fine aggregate with a particle size of 5 mm or less and coarse aggregate with a particle size of 5 to 10 mm, and the fine aggregate is
0.8-2.5 weight ratio, coarse aggregate 0.8-2.0 weight ratio, cement
It is preferable to knead water at a mixing ratio of 0.5 to 1.5 weight ratio and water at 0.25 to 0.8 weight ratio.

(Operation) Since chamotte brick is hard and porous, has excellent compressive strength, and has low thermal conductivity, from the middle of the thickness direction of the second face shell including the crushed pieces of chamotte brick to at least the middle of the thickness direction of the first face shell. Part of
That is, the compressive strength of the first web shell and its front and rear parts is improved to 350 to 500 kg / mm ² , and the thermal conductivity is 0.6 to 0.7 Kc.
It is reduced to al / mHr ° C, and the improvement of the compressive strength enables the width of the first web shell to be narrowed.

(Example) In FIGS. 1 and 2, 1 is a first face shell, 2 is a second face shell, 3 is a third face shell, 4 is a first web shell, 5 is a second web shell, The first face shell 1, the second face shell 2, and the third face shell 3 are provided with V-grooves 1a, 2a, and 3a on the upper surfaces thereof, respectively, and V-grooves similar to the above are provided on one side face thereof. 1b, 2b and 3b
Are provided and intersect and communicate with the V grooves 1a, 2a, 3a on the upper surface, respectively. Further, on the other side surface, a ridge 1c fitted into the V groove 1b, 2b, 3b on the one side surface,
2c and 3c are provided.

The first face shell 1 and the second face shell 2 described above are connected by four relatively small first web shells 4, and the second face shell 2 and the third face shell 3 are connected.
Are connected by two relatively large second feb shells 5. The second web shell 5 is the face shell 2,
It is provided at a distance of 1/4 of the width (length in the left-right direction in FIG. 1) of the face shells 2, 3 from both ends of 3, and the first web shell 4 is symmetrical with respect to the second web shell 5. The first web shells 4 at both ends are provided so as to be slightly retracted from both end surfaces of the face shells 1 and 2.

The upper surface of the first web shell 4 is inclined at a position lower than the upper surfaces of the first face shell 1 and the second face shell 2 and is low on the first face shell 1 side and high on the opposite side. It is provided. Further, a vertical ridge 4a is provided at the center of both side surfaces of the first web shell 4.

Thus, in this embodiment, the front portion A from the center of the second face shell 2 in the thickness direction to the front face of the first face shell 1 is formed of concrete using crushed pieces of chamotte brick as an aggregate, and the second face A rear portion B from the center of the shell 2 in the thickness direction to the back surface of the third face shell 3 is formed of concrete containing natural aggregate.

The chamotte brick is crushed, and the crushed pieces are classified into fine aggregate with a particle size of 5 mm or less and coarse aggregate with a particle size of 5 to 10 mm, and the above fine aggregate, coarse aggregate, Portland cement and water are mixed using a mixer. While kneading at a weight ratio of 2: 1: 1: 0.5,
Similarly, gravel was used in place of the crushed pieces, and the two types of mortar obtained were respectively fed to a compression molding machine, and the front part A was mortar containing crushed pieces of chamotte bricks, and the rear part. Simultaneously molding B with mortar containing natural gravel and curing it into a product, the first web shell 4
Has a compressive strength of 350 to 500 kg / mm ² and a thermal conductivity of 0.62 KCal / m.
The width of the first web shell 4 can be reduced to 30 mm from the conventional 30 mm to 25 mm.

In this embodiment, since the sealing material can be loaded around the face shells 1, 2, and 3, it is not necessary to apply the joint mortar at the time of assembling, and the joint mortar may be cracked or the joint mortar may be cracked. The mortar does not peel off and fall into the small cavities between the first and second face shells 1 and 2 to expand the heat transfer area. Further, even if rainwater enters the inside of the first face shell 1, in that case, the water that has dropped from the upper surface of the first face shell 1 to the upper surface of the first web shell 4 is the first.
The water flowing along the slope of the upper surface of the web shell 4 toward the first face shell 1 side, without flowing toward the opposite second face shell 2 side, and flowing down the side surface of the first web shell 4 is It is blocked by the ridges 4a on the side surface and flows downward along the first face shell 1 side without flowing to the second face shell 2 side, and is drained. In the case of zigzag stacking, the four first web shells 4 are arranged along the vertical straight line, so that the above drainage is smoothly performed.

In the embodiment shown in FIGS. 3 and 4, two first web shells 4 are provided on the same line as the second web shells 5, and the second web shells 5 are arranged in the thickness direction middle to the first face shell 1 thickness direction. The front portion C up to the middle is formed of concrete using crushed pieces of chamotte brick as an aggregate, and the rear portion B from the middle in the thickness direction of the second face shell 2 to the rear surface of the third face shell 3 and the first face. The decorative surface portion D from the middle in the thickness direction of the shell 1 to the front surface is formed of concrete containing natural aggregate.

(Effects of the Invention) This invention is a waterproof concrete block for construction that includes natural aggregates such as sand, gravel, and crushed stone, and has first, second, and third face shells. Since the portion extending from the intermediate layer to at least the intermediate layer of the first face shell is replaced with a concrete layer having crushed pieces of chamotte brick as an aggregate, the first face shell and the second face shell are connected. The compressive strength of the web shell is improved and its thermal conductivity is reduced.
Therefore, the width of the first web shell can be made narrower than the conventional one, and the heat insulating property is improved in combination with the decrease in the thermal conductivity, and an excellent heat insulating concrete block for construction can be obtained.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, FIG. 3 is a plan view of a main part of a modified example, and FIG. 4 is a plan view of FIG. FIG. 4 is a sectional view taken along line IV-IV. 1, 2, 3: Face shell, 4, 5: Web shell,
A, C: front part using crushed pieces of chamotte brick as aggregate, B: rear part using sand, gravel, crushed stone, etc. as aggregate
D: A decorative surface portion using sand, gravel, crushed stone, etc. as an aggregate.

Claims (1)

[Scope of utility model registration request] 1. First, second, and third face shells, respectively.
It is composed of first and second web shells connecting them, and a relatively small sub-cavity is formed by the first and second face shells on the front side and the first web shell, and the second and the second shells on the rear side. In the concrete block for construction in which a relatively large main cavity is formed by the face shell of No. 3 and the second web shell, chamotte brick fragments from the middle of the second face shell in the thickness direction to at least the middle of the first face shell in the thickness direction. A concrete block for construction, characterized in that it is formed of a concrete layer containing as aggregate, and the remaining part is formed of a concrete layer containing natural aggregate such as sand, crushed stone, and gravel.