JP6534201B2 - Void member for concrete - Google Patents

Description

  The present invention relates to a concrete void member embedded in a concrete structure such as a concrete slab, and more particularly to a concrete void member having a thickness indication.

In a concrete structure such as a concrete slab, it is known to embed a void member in concrete in order to reduce the amount of cast concrete and reduce weight. Generally, such void members are formed by foam molding and are lighter than concrete.
For example, the void members in Patent Documents 1 and 2 have a cubic or rectangular parallelepiped shape.
In the void member of Patent Document 3, the middle portion in the vertical direction has a constant cross section with an octagon, and the upper portion and the lower portion of the middle portion each have a tapered truncated cone shape.

Patent No. 3438852 Patent No. 5654652 gazette Patent No. 5259465 gazette

The thickness of the concrete slab is not uniform depending on the structure. Therefore, void members of various thicknesses are also required. However, manufacturing a void member using a separate mold for each different thickness increases the manufacturing cost. Therefore, the inventors examined to manufacture a plurality of types of void members having different thicknesses by one mold. In addition, by providing a thickness indication on the outer surface of the void member, it was examined to make it easy to distinguish the thickness of the void member. On the other hand, at the manufacturing site of the void member, it is troublesome to replace the mold for thickness indication every time the thickness is changed, and it is also assumed that the mold for the different thickness is mistaken.
An object of the present invention is to make it easy to determine the thickness of a void member in view of the above-mentioned circumstances, to prevent the complication of manufacturing and to suppress an increase in manufacturing cost.

In order to solve the above-mentioned problems, the present invention is a void member embedded in a concrete structure,
A thickness indicator is provided on the side,
The thickness display unit has a plurality of thickness displays arranged along the thickness direction of the void member;
The thickness indication of the one end portion in the thickness direction of the thickness indication portion is characterized by representing the thickness of the void member.

  According to this void member, the thickness of the void member can be easily determined by reading the thickness indication of one end of the thickness indication part. Moreover, when manufacturing the void member, even if the thickness of the void member is changed by adjusting the relative height between the upper mold and the lower mold of one void member manufacturing mold, molding for the thickness display portion There is no need to replace the mold with the thickness of the void member. That is, even if the thickness of the void member is different, the thickness display portion can be formed by the same mold, and the thickness display of one end portion of the thickness display portion of the void member of any thickness is The thickness of the void member can be represented. Therefore, while being able to prevent that complication of manufacture of a void member is caused, the increase in manufacturing cost can be suppressed.

The void member is
A body having a constant cross section in the thickness direction;
A first frustum portion which protrudes from one end portion in the thickness direction of the main body portion and whose cross section becomes smaller as the distance from the main body portion increases;
A second frustum portion which protrudes from the other end portion in the thickness direction of the main body portion and whose cross section decreases with distance from the main body portion;
The thickness indicator is provided on the side of the body,
Each thickness indication represents a value obtained by adding the total thickness of the first and second frustums to the distance from the other end of the main body to the thickness indication.
It is preferable that the thickness indication of the one end of the thickness indication part be disposed at the one end of the main body part.
Thereby, the thickness indication of the one end of the thickness indication part is a value obtained by adding the total thickness of the first and second frustum parts to the thickness from the other end of the main body to the one end Thus, the thickness of the entire void member can be reliably represented.

  According to the present invention, the thickness of the void member can be easily determined. Moreover, it can prevent that complication of manufacture of a void member is caused, and increase of manufacturing cost can be suppressed.

Fig.1 (a) is a front view which shows the void member for concrete which concerns on one Embodiment of this invention. FIG.1 (b) is a side view of the said void member in alignment with the Ib-Ib line of FIG. 1 (a). FIG. 2 is a perspective view of the concrete void member. FIG. 3 is a perspective view of a concrete void member of another thickness. FIG. 4 is an explanatory sectional view of a mold for manufacturing the void member for concrete. FIG. 5 is a perspective view of the peripheral portion of the thickness display portion forming mold of the manufacturing mold as viewed from the inside of the hollow portion.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 show a void member 1 for concrete according to an embodiment of the present invention. The shape of the void member 1 is a general block shape. Specifically, the void member 1 includes a main body portion 10, a first frustum portion 11, and a second frustum portion 12. The main body portion 10 has a constant cross section at any position in the thickness direction (height direction). Here, although the cross-sectional shape of the main-body part 10 is a quadrangle, it may be other shapes, such as a polygon other than a quadrangle, and a circle. The first frustum portion 11 protrudes from the upper end portion (one end portion in the thickness direction) of the main body portion 10. The first frustum portion 11 has a substantially square frustum shape, and the cross section becomes smaller as it goes away from the main body portion 10 upward. A plurality of grooves 11b, 11b... Having a V-shaped or trapezoidal cross section are formed in parallel on the upper surface 11a of the first frustum portion 11. The second frustum 12 protrudes from the lower end (the other end in the thickness direction) of the main body 10. The second frustum portion 12 has a substantially inverted quadrangular frustum shape, and the cross section becomes smaller as it goes away from the main body portion 10 downward. On the lower surface 12a of the second frustum 12, for example, two wide grooves 12b, 12b having a semicircular cross section are formed side by side.

  The void member 1 is embedded in a concrete structure (not shown) such as a concrete slab, for example. As a material of the void member 1, a material having a specific gravity smaller than that of concrete is used. Preferably, the void member 1 is made of a foamed resin such as expanded polystyrene. Thus, the weight of the concrete structure can be reduced, and the amount of cast concrete can be reduced. The grooves 11b and 12b of the void member 1 can be used as an accommodation portion of a void suppressing / reinforcing bar for holding the void member 1 so as not to move during concrete placement.

  As shown in FIG. 1A and FIG. 2, a thickness display portion 10 b is provided on one side surface 10 a of the main body portion 10. The thickness display portion 10 b is recessed from the side surface 10 a and extends vertically (in the thickness direction). The upper end portion (one end portion) of the thickness display portion 10 b reaches the upper end portion (the boundary with the first frustum portion 11) of the main body portion 10. The lower end (the other end) of the thickness display portion 10 b reaches the lower end (the boundary with the second frustum portion 12) of the main body 10. In the thickness display portion 10b, a plurality of thickness displays 10h, 10h,... The thickness display 10 hz of the upper end portion of the thickness display portion 10 b is disposed at the upper end portion (the boundary with the first frustum portion 11) of the main body portion 10.

As shown in FIG. 1 (a), each thickness indication 10h is the total thickness (t ₁₁ + t ₁₂ ) of the truncated pyramids 11 and 12 at the distance from the lower end of the main body 10 to the thickness indication 10h. It consists of the numerical value which expressed the value which added as a centimeter (cm). For example, when the thickness indication 10 h is “15”, the distance L ₁₅ from the lower end (the boundary with the second frustum 12) in the main body 10 to the thickness indication 10 h of “15” and the frustum 11 , 12 and the total thickness (L ₁₅ + t ₁₁ + t ₁₂ ) indicate 15 centimeters. Therefore, in the thickness indication 10h, the numerical value increases as the value increases. Here, although thickness indication 10h is attached every one centimeter, it may be every two centimeters, or may be more than that. Also, it may be every 0.5 centimeters, or may be less than that. The thickness indication 10 h is not limited to the centimeter notation but may be a millimeter notation or a metric notation.

As shown in FIG. 1A, the upper end thickness indication 10hz is the largest numerical value among the thickness indications 10h, 10h... In the thickness indication portion 10b. The upper end thickness indication 10 hz is the total thickness of the frustums 11 and 12 (t ₁₁ + t ₁₂ ) at the distance from the lower end of the main body 10 to the upper end thickness indication 10 hz, ie, the thickness t ₁₀ of the main body 10. Represents the value obtained by adding). In short, the upper end thickness indication 10 hz represents the thickness t _{1 of the} entire void member 1 (t ₁ = t ₁₀ + t ₁₁ + t ₁₂ ). For example, as shown in FIG. 2, in the case of the void member 1 having a thickness of t ₁ = 25 cm, the numerical value of the upper end thickness display 10 hz is “25”. Further, as shown in FIG. 3, in the case of the void member 1 having a thickness of t ₁ = 15 cm, the numerical value of the upper end thickness display 10 hz is “15”.
In the figure, although the upper end thickness display 10hz is interrupted at the central portion and only the lower half is displayed, the entire upper end thickness display 10hz may be displayed.

  FIG. 4 shows a void member manufacturing mold 30 (void member manufacturing apparatus) for manufacturing the void member 1. The void member manufacturing mold 30 includes an upper die 31, a lower die 32, and a thickness indication portion molding die 33. The upper die 31 is moved up and down with respect to the lower die 32 to open and close the void member manufacturing die 30. A cavity 30 a is formed between the upper mold 31 and the lower mold 32. The relative movement direction (vertical direction) of the upper and lower molds 31 and 32 is along the thickness direction of the void member 1 to be manufactured.

  The thickness display portion molding die 33 can be advanced and retracted relative to the lower die 32. The molding surface 33a of the thickness display portion molding die 33 faces the cavity 30a. As shown in FIG. 5, the display surface 33a is provided with a plurality of display dies 33h, 33h. The display type 33h is a mirror copy of the thickness display 10h, and is arranged in a zigzag so that the value increases in the upward direction.

The void member 1 is manufactured as follows.
The void member manufacturing mold 30 is closed by fitting the lower part of the upper die 31 to the lower die 32 and advancing the thickness indicator mold 33 to fit the dies 31, 32. At this time, the height relative to the lower mold 32 of the upper mold 31 is adjusted in accordance with the thickness of the void member 1 to be manufactured. This regulation, as indicated by two-dot chain line L ₂ or three-dot chain line L ₃ of Figure 5, the lower end portion of the upper die 31, the height of the display type 33h indicating the thickness of the void member 1 to be manufactured Be placed. For example, when manufacturing the void member 1 (FIG. 2) having a thickness t ₁ = 25 cm, the lower end portion (two-dot chain line L _{2 in} FIG. 5) of the upper die 31 has a height of display die 33 h ₂₅ representing “25”. Are placed. When manufacturing the thickness _t 1 = void 15cm member 1 (FIG. 3), the lower end of the upper mold 31 (two-dot chain line _{L 3} in FIG. 5) is, the height of the display type _{33h 15} representing "15" Be placed.

Next, the void member 1 is foam-formed in the hollow portion 30a.
The thickness display portion 10b can be formed on the side surface 10a of the void member 1 by the thickness display portion molding die 33, and the thickness displays 10h, 10h can be formed on the display dies 33h, 33h,. Consequently, the upper end thickness indication 10hz can be formed by the display die 33h located at the lower end portion of the upper die 31. The upper end thickness indication 10 hz represents the thickness t ₁ of the void member 1.

When manufacturing the void member 1 of different thickness, the height with respect to the lower mold 32 of the upper mold 31 is changed. Thereby, the thickness of the void member 1 to be manufactured can be easily changed. In short, one void member production mold 30 can produce a plurality of types of void members 1 having different thicknesses. It is not necessary to use another void member manufacturing mold 30 for each thickness of the void member 1 to be manufactured. Therefore, the manufacturing cost can be reduced.
In addition, the thickness display portion 10 b can be formed on the void member 1 of various thicknesses by one thickness display portion molding die 33. There is no need to replace the thickness indicator mold 33 for each void member 1 having a different thickness. Therefore, the manufacturing of the void member 1 can be further facilitated, and the manufacturing cost can be further reduced.

Thus, according to the void member 1 which is manufactured, it can be easily determined thickness t ₁ of the voids member 1 by upper thickness display 10hz thickness display unit 10b. By this, installation construction etc. to the concrete slab of the void member 1 can be facilitated.

The present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the invention.
For example, the void member 1 is not limited to the shape of the above embodiment, and the upper and lower frustum portions 11 and 12 may be omitted. The entire void member 1 may have a cubic or rectangular shape. In this case, the upper end portion of the thickness display portion 10 b may reach the upper end portion of the side surface of the void member 1, and the upper end thickness display 10 hz may be provided at the upper end portion of the side surface of the void member 1.
The thickness indication 10h is not limited to a numerical value, and may be a symbol or a mark, as long as an operator or the like can determine the thickness of the void member 1.
The concrete structure in which the void member 1 is embedded is not limited to a concrete slab, and may be a concrete column or the like. The void member 1 may be embedded in a concrete structure such as a concrete column in a state where the thickness direction is directed to the left and right (horizontal).

  The present invention is applicable to, for example, the construction of a reinforced concrete structure.

1 Void member 10 Body portion 10a Side surface 10b Thickness display portion 10h Thickness display 10hz Upper end thickness display (thickness display of one end)
11 first frustum 12 second frustum

Claims (1)

A void member embedded in a concrete structure,
A thickness indicator is provided on the side,
The thickness display unit has a plurality of thickness displays arranged along the thickness direction of the void member;
The thickness display at one end of the thickness direction of the thickness of the display unit, has table Wa thickness of the voids member, further,
A body having a constant cross section in the thickness direction;
A first frustum portion which protrudes from one end portion in the thickness direction of the main body portion and whose cross section becomes smaller as the distance from the main body portion increases;
A second frustum portion which protrudes from the other end portion in the thickness direction of the main body portion and whose cross section decreases with distance from the main body portion;
The thickness indicator is provided on the side of the body,
Each thickness indication represents a value obtained by adding the total thickness of the first and second frustums to the distance from the other end of the main body to the thickness indication.
A concrete void member, wherein a thickness indication of the one end of the thickness indication portion is disposed at the one end of the main body portion.

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