Formwork-shaped blocks

Abstract

The present invention provides a formwork-like block that can prevent web splitting failure and improve the load-bearing capacity of the constructed wall. [Solution] A formwork-like block 1 is formed by connecting parallel face shells 2 with a web 3, wherein the upper surface of the web 3 is formed as a horizontal surface at the same height as the upper surface of the face shell 2, except for a U-shaped cutout 4 with a width of 28-30 mm and a depth of 35-50 mm for arranging horizontal reinforcement bars formed in the web 3, and the lower surface of the web 3 is formed as a horizontal surface at the same height as the lower surface of the face shell 2. A cast-in joint 5 may be formed on the upper surface of the face shell 2 along the entire length of the face shell 2.

Description

Technical Field

[0001] This invention relates to a formwork block.

Background Art

[0002] A formwork block has a shape in which facing face shells are connected by webs, has large cavities continuous vertically and horizontally, and is a block with a cross-sectional shape having a volume cavity ratio of 50 to 70% that is used by completely filling the cavities with a filler made of concrete or mortar (JIS A 5406 "Formwork Block").

[0003] And in Japan, which is a seismic country, when constructing a wall by assembling formwork blocks using a joint material such as mortar, it is necessary for earthquake resistance to insert and reinforce steel bars at regular intervals into the cavities of the formwork blocks. For these steel bars, vertical bars are inserted into the vertically oriented cavities and horizontal bars are inserted into the horizontally oriented cavities so that the steel bars are arranged in a grid pattern. After inserting the steel bars, the cavities around the steel bars are filled with concrete or mortar so as to adhere to the steel bars and hardened so that the formwork block and the steel bars are integrated.

[0004] The formwork block has a shape in which a part of the web is pre-cut out in order to insert the horizontal bar horizontally (see, for example, Patent Document 1). And regarding the cut-out shape of the web of this formwork block, importance has been attached to the fact that the concrete or mortar filled around the horizontal bar is continuous horizontally, and in order to secure sufficient space around the steel bar, it has been considered desirable that the web is cut out in a large U-shape or V-shape near the portion where the web is connected to the face shell. In particular, in a formwork block in which the cavities of the formwork block are completely filled with concrete or mortar, not only the upper side of the web on which the horizontal bar is placed but also the lower side are both cut out in a U-shape or V-shape, and such double-cut blocks have become widespread as a shape that improves the filling property of concrete or mortar (see, for example, Patent Document 2).

[0005] However, the concrete or mortar filled into the cavities of formwork blocks shrinks during hardening, making it easy for voids to form on the underside of the web. These voids are structural defects that reduce the load-bearing capacity of the wall constructed by stacking formwork blocks, so it is desirable to minimize them. In particular, in the case of formwork blocks where the cavities are completely filled with concrete or mortar, it has been found that when a vertical load is applied after hardening, the load is not transmitted downwards because of the void on the underside of the web, causing the web to crack and fail, deforming the block and reducing the load-bearing capacity of the wall. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2018-13008 [Patent Document 2] Japanese Patent Publication No. 2023-13907 [Overview of the project] [Problems that the invention aims to solve]

[0007] In view of the problems with the above-mentioned formwork-like blocks, this invention aims to provide a formwork-like block that can prevent web splitting and failure and improve the load-bearing capacity of the constructed wall. [Means for solving the problem]

[0008] To achieve the above objective, the formwork-like block of the present invention is a formwork-like block formed by connecting parallel face shells with a web, characterized in that the upper surface of the web is formed as a horizontal surface at the same height as the upper surface of the face shell, except for a U-shaped cutout portion with a width of 28 to 30 mm and a depth of 35 to 50 mm for arranging horizontal reinforcement bars formed in the web, and the lower surface of the web is formed as a horizontal surface at the same height as the lower surface of the face shell.

[0009] In this case, a casting joint can be formed on the upper surface of the face shell, extending along the entire length of the face shell. [Effects of the Invention]

[0010] According to the formwork-like block of this invention, the upper surface of the web is formed as a horizontal surface at the same height as the upper surface of the face shell, except for a U-shaped cutout 28-30 mm wide and 35-50 mm deep in which horizontal reinforcement bars are placed in the web, and the lower surface of the web is formed as a horizontal surface at the same height as the lower surface of the face shell. As a result, when the formwork-like blocks are stacked, the upper and lower blocks come into contact not only with the face shells but also with each other's webs, creating a continuous vertical connection. This increases the contact surface, preventing splitting failure of the web due to the formation of gaps on the underside of the web. Combined with the fact that stress generated in the blocks is more easily transmitted downwards, the load-bearing capacity of the constructed wall can be improved. [Brief explanation of the drawing]

[0011] [Figure 1] An embodiment of the formwork-shaped block of the present invention is shown below: (a) a plan view, (b) a front view of a partial cross section, (c) a side view, (d) a cross section AA of (b), and (e) a cross section BB of (b). [Figure 2] This shows a modified embodiment of the formwork-shaped block of the present invention, where (a) is a plan view, (b) is a front view of a partial cross section, (c) is a side view, (d) is a cross-sectional view AA of (b), and (e) is a cross-sectional view BB of (b). [Modes for carrying out the invention]

[0012] The following describes embodiments of the formwork-shaped block of the present invention based on the drawings.

[0013] Figure 1 shows one embodiment of the formwork-shaped block of the present invention. This formwork-like block 1 is formed by connecting parallel-formed face shells 2 with webs 3 at four points, and has a total length L1: 599 mm, a total height H1: 100 mm, and a total thickness W1: 125 mm (actual thickness 120 mm). The upper surface of the web 3 is formed as a horizontal surface at the same height as the upper surface of the face shell 2, except for a U-shaped cutout 4 with a width W4: 28-30 mm (30 mm in this embodiment) and a depth H4: 35-50 mm (40 mm in this embodiment) where horizontal reinforcement bars formed in the web 3 are placed, and the lower surface of the web 3 is formed as a horizontal surface at the same height as the lower surface of the face shell 2.

[0014] Here, the U-shaped notch 4 is formed with a width W4 of 28-30 mm (30 mm in this embodiment), which is the minimum width required to allow horizontal reinforcement bars made of D10 (10 mm in diameter) or D13 (13 mm in diameter) to be overlapped (placed side by side) at the lap joint. This allows the dimensions L3 of the upper surface of the web 3, which is formed on both sides of the notch 4 so as to be at the same height as the upper surface of the face shell 2, to be 16 mm (25.5 mm in the case of the modified formwork-like block of the present invention shown in Figure 2 (a formwork-like block with a total length L1: 599 mm, total height H1: 100 mm, and total thickness W1: 155 mm (actual thickness 150 mm)).

[0015] In this case, the upper surface of the face shell 2 is struck along the entire length of the face shell 2. This is designed to form a recessed joint 5. The cast-in joint 5 is designed so that when mortar (grout) is filled into the cavity of the formwork block, grout is also filled into the gaps above and below the face shell 2, and a joint is formed in a "post-construction" manner. To achieve this, a portion of the face shell 2 is cut out in advance.

[0016] According to this formwork block 1, the upper surface of the web 3 is formed on a horizontal plane at the same height as the upper surface of the face shell 2, except for the U-shaped notch 4 with a width of 28-30 mm and a depth of 35-50 mm where the horizontal ribs formed on the web 3 are arranged. At the same time, the lower surface of the web 3 is formed on a horizontal plane at the same height as the lower surface of the face shell 2. By doing so, when the formwork blocks 1 are stacked, the upper and lower blocks not only contact each other at the face shell 2 but also the webs 3 contact each other vertically and continuously, increasing the contact surface. As a result, it is possible to prevent the web 3 from being torn and broken due to the generation of a gap on the lower side of the web 3. Combined with the fact that the stress generated in the block is easily transmitted downward, the bearing capacity of the constructed wall can be improved.

[0017] As described above, the formwork block of the present invention has been described based on its embodiments. However, the present invention is not limited to the configuration described in the above embodiments, and its configuration can be appropriately changed within the scope not departing from the gist thereof.

Industrial Applicability

[0018] Since the formwork block of the present invention can prevent the web from being torn and broken and improve the bearing capacity of the constructed wall, it can be suitably used for RM construction applications.

Explanation of Reference Numerals

[0019] 1 Formwork block 2 Face shell 3 Web 4 Notch 5 Driving joint

Claims

1. A formwork-like block formed by connecting parallel face shells with a web, characterized in that the upper surface of the web is formed as a horizontal surface at the same height as the upper surface of the face shell, except for a U-shaped cutout 28 to 30 mm wide and 35 to 50 mm deep for arranging horizontal reinforcing bars formed in the web, and the lower surface of the web is formed as a horizontal surface at the same height as the lower surface of the face shell.

2. The formwork-like block according to claim 1, characterized in that a casting joint is formed on the upper surface of the face shell along the entire length of the face shell.

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