JPH0421932Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention relates to a formwork concrete block for construction.

(Prior Art) As a concrete block for construction, a formwork concrete block in which reinforcing bars can be arranged vertically and horizontally is known. Figure 5 shows
An example of this formwork concrete block 1 is shown,
The rectangular flat face shells 2, 2 located at the front and rear (left and right in the figure) are integrally connected by a web shell 3 having large U-shaped recesses 3a, 3b formed on both the upper and lower sides. Vertical reinforcing bars are placed in the vertical holes (front and rear), and horizontal reinforcing bars are placed in the horizontal grooves formed by the upper and lower recesses 3a and 3b.

Therefore, when manufacturing such a formwork concrete block 1 for construction, a rectangular frame surrounding the four circumferences of the concrete block 1 and a drawn core (lower A mold) is placed within the above frame, and the cores corresponding to the left and right vertical holes of the web shell 3 are fixed to the above frame so as to hang from above to form a mold for molding, and mortar is poured into the space of this mold. After filling, the shoe (upper mold) corresponding to the upper recess 3a is lowered from above to pressurize the mortar with a constant pressure, and then the drawing core (lower mold) is pulled out to the side and the shoe is lowered. A molded product was extruded onto a pallet, and the molded product was transported together with the pallet to a curing room for hardening.

(Problem to be solved by the invention) The conventional architectural formwork concrete block 1 is
As shown in FIG. 5, the thickness T between the upper and lower surfaces of the central part of the web shell 3 is set to approximately 1/3 of the total height H of the architectural formwork concrete block 1, and the depth Ha of the recess 3a on the upper surface and the depth Hb of the recess 3b on the lower surface were set equal to each other. That is,
The above-mentioned thickness T and depths Ha and Hb were approximately equal, and each was about 1/3 of the total height H of block 1. Therefore, after the molding is completed, the web shell 3 is removed from the mold, and until it hardens in the curing chamber, the web shell 3 bends under its own weight, and the front and rear web shells 2, 2 fall inward, causing the gap between the upper ends to be slightly larger than the specified dimension. For example, if the spacing between the upper ends is 190 mm, the width will be 1 to 3 mm narrower. A horizontal linear step 4 was formed at the overlapping portion of the architectural formwork concrete blocks 1, 1, forming a so-called armor step, which deteriorated the appearance.

This invention solves the above-mentioned problems by changing the shape of a concrete formwork block for construction, and provides a concrete formwork block for construction in which no steps are generated during masonry.

(Means for solving the problem) In this invention, as shown in FIG. 1, large U-shaped or V-shaped recesses 13a and 13b are formed on both the upper and lower surfaces of the front and rear face shells 12, 12. In the architectural formwork concrete block 11 that is connected by a web shell 13 that allows vertical and horizontal reinforcing bars to be placed, the depth Ha of the recess 13a on the top surface of the web shell 13 is equal to the distance between the upper and lower surfaces of the center of the web shell 13. The depth of the recess 13b on the lower surface of the web shell 13 is smaller than the thickness T.
Hb is formed to be larger than the thickness T between the upper and lower surfaces of the central portion of the web shell 13. The preferred dimensions of the depths Ha and Hb of the upper and lower recesses 13a and 13b and the thickness T of the central part of the web shell 13 are that the depth Ha of the upper surface is 15 to 25% of the total height H, and the depth Hb of the lower surface is 15% to 25% of the total height H. 35-50% of the web shell thickness T is the total height H
35-45% of

(Function) Since the recess 13a on the upper surface is shallow, even if the web shell 13 is bent between the end of molding and curing and hardening, the upper ends of the face shells 12, 12 will fall inward and the distance between the upper ends will narrow. will be extremely small, and there will be almost no difference from the specified dimensions. Furthermore, the lower ends of the face shells 12, 12 are restricted from sliding due to the frictional force acting between them and the upper surface of the pallet, and the spread between the lower ends is prevented.

(Example) As shown in Fig. 1, architectural formwork concrete consists of front and rear face shells 12, 12 formed in a rectangular flat plate shape and two left and right web shells 13, 13 (see Fig. 4). In block 11, the depth Hb of the recess 13b on the lower surface is approximately 50% of the total height H.
%, and the depth Ha of the recess 13a on the upper surface is approximately 20% of the above-mentioned total height H, and two small semicircular recesses 13c for horizontal reinforcing bars are provided on the upper surface of the web shell 13.

The architectural formwork concrete block 20 of the embodiment shown in FIGS.
The thickness of the central part of this web shell 23 is T, and the depth of the recess 23a on the top surface is
Ha, the depth Hb of the recess 23b on the lower surface, and the recesses 23c, 23c for the horizontal reinforcing bars are formed almost in the same way as in the embodiment shown in FIG. In this example, a protrusion 24 having a rectangular cross section is provided in a columnar shape in the vertical direction along each of the left inner surface of the front face shell 21 and the right inner surface of the rear face shell 22, and the upper end of the protrusion 24 is provided upwardly. Extend to protrusion 24
a, and a vertical groove 25 with a rectangular cross section is formed on each of the right inner surface of the front face shell 21 and the left inner surface of the rear face shell 22, and when this architectural concrete block 20 is stacked in a staggered manner, the upper side The protrusion 24a of the lower block 20 fits into the vertical groove 25 of the lower block 20 to prevent the upper and lower blocks 20 from shifting in the front, rear, left, and right directions. Further, in this embodiment, horizontal step portions 21a, 22a are recessed along the inner edges of the upper surfaces of the face shells 21, 22 (see Fig. 3), so that the faces of the upper and lower blocks 20, 20 are recessed during masonry. Horizontal grooves W are formed inside the overlapping parts of the shells 21, 21 and 22, 22, respectively, and when the fresh concrete is poured after masonry is completed, the fresh concrete flows into the horizontal grooves W to form pour joints. ing. Note that the horizontal stepped portions 21a and 22a are connected to the two-dot chain lines 21b and 22a below, respectively.
As shown by 22b, it can be provided in an inclined shape to facilitate the formation of the above-mentioned driving joint. Furthermore,
In this embodiment (see FIG. 2), the left end surface of the front face shell 21 and the rear face shell 22 are
Edge step portions 21c and 22c in the vertical direction are recessed along each inner edge of the right end surface of the front face shell 21, and along each inner edge of the right end surface of the front face shell 21 and the left end surface of the rear face shell 22. End face protrusions 21d and 22d in the vertical direction are provided to protrude, respectively, and when a plurality of blocks 20 are arranged horizontally, the end face steps 21c and 22d of the adjacent face shells 21 and 22
22c and the end protrusions 21d and 22d engage, forming a vertical groove T between them in the vertical direction, and by pouring the fresh concrete, the fresh concrete flows into the vertical groove T, forming a pouring joint. ing.

The architectural concrete block 30 of the embodiment shown in FIG. 4 has front and rear face shells 31, 32.
Connect with two left and right web shells 33, 33,
A vertical hole 34 is formed in the center, and grooves 35, 35 in the shape of dividing the vertical hole 34 into two are formed on both left and right sides, respectively, and the web shells 33, 33 are
It is formed in the same manner as the web shell 23 shown in the figure, and vertical columnar protrusions 36, 36 are formed along the inner surfaces of both ends of the front and rear face shells 31, 32, the upper ends of which are approximately 3 to 5 mm from the upper surface of the face shells 31, 32. Protrusions 36a, 36a are formed on the upper surfaces of the face shells 31, 32 so as to protrude, and a longitudinal groove is formed in the center of the inner surface of the face shells 31, 32 with a width that allows two of the above-mentioned protrusions 36 to be fitted in parallel. 37, 37, and in this example, a large number of blocks 3
0 are stacked in a staggered manner, the two protrusions 36a, 36a at both ends of the blocks 30 adjacent to each other on the lower side are fitted in parallel to the lower end of the vertical groove 37 in the center of the upper block 30, and Misalignment is prevented. It is the same as the embodiment shown in FIGS. 2 and 3 in that pouring crevices are formed inside the adjacent parts of the face shells 31 and 32 by pouring fresh concrete after masonry.

(Effects of the invention) This invention forms a shallow recess on the top surface of the web shell of a formwork concrete block, and a deep recess on the bottom surface.In other words, the web shell is placed at a higher position than before. This prevents the face shell from tilting in an uncured and unhardened state after molding, and the distance between the upper ends of the front and rear face shells from becoming smaller than a specified size.
Therefore, the appearance of a building using this architectural formwork concrete block is improved without the formation of armor steps that conventionally occur during masonry. Furthermore, the purpose is achieved by changing the shape of the block.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the first embodiment of this invention, Fig. 2 is a plan view of the second embodiment, Fig. 3 is a sectional view taken along the - line in Fig. 2, and Fig. 4 is a cross-sectional view of the third embodiment. 5 is a plan view, FIG. 5 is a cross-sectional view of a conventional concrete formwork block, and FIG. 6 is a cross-sectional view showing the block of FIG. 5 in use. 11, 20, 30... Architectural formwork concrete block, 12, 21, 22, 31, 32... Face shell, 13, 23, 33... Web shell, 13a, 23a, 33a... Recess on top surface, 1
3b, 23b...Concavity on the lower surface, Ha, Hb...Depth of the concavity, T...Thickness at the center of the web shell.

Claims (1)

[Scope of utility model registration request] Large U on both the top and bottom of the front and rear face shells.
In architectural formwork concrete blocks that are connected by a web shell with a recess formed in a shape of a letter or V, which enables the placement of reinforcing bars in the vertical and horizontal directions, the depth of the recess on the top surface of the web shell is equal to the depth of the recess at the center of the web shell. An architectural formwork concrete block characterized in that the depth of the recess on the lower surface of the web shell is smaller than the thickness between the upper and lower surfaces of the web shell, and the depth of the recess is larger than the thickness between the upper and lower surfaces of the central part of the web shell.