JPH0474484B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention provides a construction method for a top-shaped block in which a conical or pyramidal body is provided at the lower part of a flat upper board, and a cylindrical shaft leg is provided at the center of the lower part of the body. It is related to.

(Prior art) A top-shaped block balances the weight of the block itself, the vertical load it receives, and the integrated force of the ground reaction force and frictional resistance generated in the body and pivot legs, so that the block can be leveled without uneven settlement. It exerts the bearing capacity of the soil, and is used as a basic component in various ground stabilization and foundation reinforcement construction methods.

In the conventional installation method, the mud in the ground is dug down to a predetermined depth, and the shaft leg of a block-shaped block is inserted vertically into the bottom of the excavation part to the top end.
A group of multiple top-shaped blocks was laid, and the dug mud was backfilled into the spaces between the flat upper plates of each block and between the bodies, and a layer of concrete was poured on the top side of the block group. was.

(Problem to be solved by the invention) At the current stage, research and development of ground stabilization construction methods and foundation reinforcement methods using block-shaped blocks has progressed. By inserting the pivot legs vertically to the upper end, a group of multiple top-shaped blocks are laid, and gravel and crushed stones are placed in the spaces between the flat upper plates of each block and the spaces between the bodies. It was proposed to compact the blocks to form a gravel layer and then pour a layer of concrete over the blocks.

Filling the spaces between each block with gravel or crushed stone instead of backfilling with mud is beneficial in terms of making more effective use of the characteristics of the block-shaped blocks, but it also reduces the relationship with the waste concrete layer. is causing another problem.

In other words, in a backfill layer made of mud, the gaps between soil particles are relatively small, so there is almost no penetration of cement milk from the waste concrete layer under normal pressure, but in a backfill layer made of gravel or crushed stones,
Because the gaps between gravel and crushed stones are large, penetration of cement milk occurs widely and deeply.

The cement milk that has penetrated deeply into the interfilling gravel layer solidifies within the interfilling gravel layer, and the intermediary gravel layer and the block-shaped blocks become integrated, causing the original characteristics of the block-shaped blocks to be lost. It becomes like a solid foundation.

Therefore, an object of the present invention is to provide a method for laying block-shaped blocks that can prevent cement milk from penetrating into the packed gravel layer, and in which it is impossible to integrate the block-shaped blocks and the packed gravel layer. That's true.

(Means for Solving the Problems) As explained below using the reference numerals in the attached drawings, in the installation method of the present invention, the mud of the ground 9 is dug to a predetermined depth, and the shaft foot 4c is attached to the bottom of the dug part.
A plurality of top-shaped blocks 4 are arranged in parallel by vertically inserting them, and the flat upper board 4a of the top-shaped block group 4 is
Filling gravel layers 8 are formed by filling gravel and crushed stones in place of the dug mud in the spaces between the bodies 4b and the bodies 4b.

Then, a void retaining layer 6 of a constant thickness made of gravel, sand, etc. is formed on the upper surface side of the flat upper plate 4a of the block group 4, and a waste concrete layer 7 is formed on the upper surface side of the void retaining layer 6. Cement milk from the waste concrete layer 7 is absorbed into the void retaining layer 6.

Here, the top-shaped block 4 refers to the flat upper plate 4a.
A conical or pyramidal body 4b is provided at the lower part of the body 4b, and a cylindrical or prismatic shaft leg 4c is provided at the center of the lower part of the body 4b. The absorption of cement milk from the waste concrete layer 7 is carried out by the voids in the void retaining layer 6 or by the layer constituting material itself.

(Embodiment) In the illustrated embodiment, a plurality of top-shaped blocks 4 are mutually restrained at the upper and lower portions, and the upper connecting member 5 and A lower connecting member 3 is used.

The lower connecting member 3 includes a plurality of support rods 2 in which a plurality of rings 1 are arranged at predetermined vertical and horizontal intervals in a crosswise manner.
The shaft legs 4c of the top-shaped blocks are fitted into the ring 1.

The upper connecting member 5 is composed of a vertical support member 5a that passes through a hanging tool 4d protruding from the upper part of the flat upper board 4a, and a horizontal support member 5b that intersects with the vertical support member 5a. 5b is fixed to the hanger 4d by suitable means such as wire binding or welding.

Note that the shapes and structures of the lower connecting member and the upper connecting member are not limited to those described above, and may be any shape as long as they can mutually restrain a plurality of top-shaped blocks at the upper and lower portions.

(Effects of the Invention) As described above, in the present invention, gravel and crushed stones are packed into the spaces between the flat upper plates 4a of each piece-shaped block group 4 and between the bodies 4b, replacing the dug mud. By this, a packed gravel layer 8 is formed, and a void retaining layer 6 of a constant thickness made of gravel or sand is formed on the upper surface side of the flat upper plate 4a of the block type block group 4, and a void retaining layer 6 of a constant thickness is formed on the upper surface side of the void retaining layer 6. Since the waste concrete layer 7 is formed in the waste concrete layer 7 and the cement milk from the waste concrete layer 7 is absorbed by the void retaining layer 6, penetration of the cement milk into the interfilling gravel layer 8 is accurately prevented. Therefore, there is no fear that the block block 4 and the interfilling gravel layer 8 will be integrated with the cement milk and become like a solid foundation, and the original excellent characteristics of the block block can be maximized.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an example of a block-shaped block used in the construction method of the present invention. FIG. 2 is a longitudinal cross-sectional view of the block installation state in one embodiment of the present invention, and FIG. 3 is a perspective view showing the lower connecting member 3 separated. DESCRIPTION OF SYMBOLS 1...Ring, 2...Support rod, 3...Lower connecting member, 4...Block, 4a...Flat upper plate, 4b
...Pyramidal body, 4c...Cylindrical shaft leg, 4d...
Hanging tool, 5... Upper connecting member, 5a... Vertical support member, 5b... Horizontal support member, 6... Gap retaining layer, 7
...Waste concrete layer, 8...Filled gravel layer, 9...
ground.

Claims (1)

[Claims] 1. Dig the mud in the ground 9 to a predetermined depth, insert the shaft leg 4c vertically into the bottom of the excavated part, arrange a plurality of block-shaped blocks 4 in parallel, and make sure that the flat upper plates 4a of the block group 4 are mutually connected. A filling gravel layer 8 is formed by filling gravel and crushed stones in place of the dug mud in each of the spaces between the gap and the body 4b. A void retaining layer 6 of a constant thickness is formed on the upper surface side of gravel, sand, etc., a waste concrete layer 7 is formed on the upper surface of the void retaining layer 6, and cement milk from the waste concrete layer 7 is applied to the void retaining layer 6. A construction method for installing frame-shaped blocks that are absorbed by