JP-7856813-B2 - Rammed earth blocks

JP7856813B2JP 7856813 B2JP7856813 B2JP 7856813B2JP-7856813-B2

Inventors

加藤猛
荒木朗
新田稔
山▲崎▼ 順二

Assignees

株式会社淺沼組

Dates

Publication Date: 20260511
Application Date: 20250430

Claims (3)

A rammed earth block is formed by compacting a material primarily composed of soil within a formwork. The rammed earth block is provided with a plurality of reinforcing members arranged inside the rammed earth block and along the longitudinal direction of the rammed earth block , The plurality of reinforcing members include a pair of reinforcing members arranged apart in the width direction of the rammed earth block, and a pair of reinforcing members arranged apart in the thickness direction of the rammed earth block relative to the pair of reinforcing members. Rammed earth blocks.
The rammed earth block according to claim 1, wherein the reinforcing material is formed from rough rope.
The rammed earth block according to claim 2, wherein the reinforcing material is formed from natural materials.

Description

This invention relates to rammed earth blocks that are manufactured using the conventionally known rammed earth construction method, enabling the construction of tall earthen walls and providing high workability, while also allowing for the reuse of earthen materials. The construction of earthen walls using the rammed earth method has long been widely known and is often seen in the earthen walls of temples and shrines. This method involves pouring soil into formwork and compacting it layer by layer at appropriate heights, repeating this process multiple times. However, when creating walls using rammed earth, a certain thickness is necessary because thin walls are fragile. This results in a heavy overall weight, and the structural instability caused by compacting the soil makes it difficult to build walls to great heights. For these fundamental problems, rammed earth is rarely used today. Japanese Patent Publication No. 2012-087017 Perspective view showing an example of the rammed earth block of the present invention.Front view of a rammed earth wall constructed using the rammed earth blocks of the present invention.The same, a front view showing the framework structure for stacking rammed earth blocks.Cross-sectional view showing the relationship between rammed earth blocks and core material. The following describes preferred embodiments of the present invention with reference to the drawings. Figure 1 is a perspective view showing the rammed earth block 1 of the present invention, which has an overall rectangular parallelepiped shape with recesses 2,2 formed on both short sides. This rammed earth block 1 is manufactured by pouring soil into a formwork (not shown) and compacting it. Therefore, the overall shape is not limited to this embodiment and can be appropriately selected according to the shape of the formwork, such as a cube or a trapezoidal cross-section. 3 is a reinforcing material arranged along the longitudinal direction inside the cross-section, and is intended to resist bending stress, tensile stress, etc. While the material of the reinforcing material is not particularly limited in terms of its function, if the rammed earth block 1 of this embodiment is made of a material that can be crushed and returned to the soil when discarded after its use, it is preferable to use a similar natural material such as rough rope. As an example of the material for rammed earth block 1, excluding the reinforcing material 3, a mixture of fine aggregate sand for concrete and soil from the site where the rammed earth construction will be carried out is used, mixed with a magnesium-based solidifying agent, and then treated with tap water, groundwater, industrial water, or river water. As an example of the mixing ratio, 10 to 15 parts binder, 30 parts sand, 100 parts soil collected from the site, and 20 to 35 parts water are used, and these are mixed to create the material for rammed earth block 1. Note that the amounts of binder, sand, and soil are for the dry state. There are no particular limitations on the particle size of the soil, but preferably it is 15 mm or less and contains 15% or more clay. The ratio of soil to sand is set to 100:30 in order to ensure the use of soil collected from the site and to match the local environment. This ratio is also used to adjust the particle size to be appropriate for soil solidification and to enhance dimensional stability (prevent deformation due to drying) associated with soil solidification. These materials will be treated as industrial waste, but after their intended use, they can be crushed and reused. Furthermore, the rough rope used as reinforcing material can be treated as regular waste. Therefore, the amount of industrial waste generated can be reduced. The reason for allowing a range in the binder and water ratio is to accommodate differences in soil particle size, moisture content, and soil composition in the local soil. The ratio should be determined appropriately according to the properties of the local soil. Within this range, by adjusting the ratio and amount of water and binder according to the soil's moisture content, soil can be solidified regardless of soil type. Next, the procedure for manufacturing the rammed earth block is as follows: The materials to be used are mixed in an electric mixer until uniform. This mixture is poured into the mold up to the first layer 1a in Figure 1, and compacted with a hammer or similar tool to form the shape. Then, reinforcing material 3 such as rough rope is placed on top of the first layer, and then the material for the second layer 1b is poured in and compacted in the same way, with reinforcing material 3 placed on top of that as well. Subsequently, the material for the third layer 1c is poured in and compacted in the same way to shape the overall form, and then allowed to solidify. Compaction can be done manually or using an electric hammer drill. After compaction is complete and about one hour has passed, once the w