JPS6354863B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel method for reinforcing block walls.

Block fences can be constructed relatively easily without requiring specialized skills, do not require daily maintenance like hedges, and protect privacy, so they are rapidly placed. It has been.

Although building standards have been established, it is difficult to strictly enforce regulations against buildings that do not comply with these standards, so many buildings are being built that do not meet the standards.

Most of the fatalities in the June 12, 1973 Miyagi Prefecture Earthquake, which attracted the attention of disaster prevention officials nationwide as an urban earthquake disaster, were due to the collapse of block walls.

However, at present, no effective measures have been taken against block walls having these defects.

The conventional method of reinforcing an existing block wall is to take the foundation concrete (width 15 cm or more and length 60 cm or more) on the residential property side, weld L-shaped steel at intervals of 3.2 meters or less, and at right angles to the welds. This method involves placing steel strips horizontally at regular intervals on both sides of a block wall and tightening bolts at a pitch of 80 cm, but the steel used in this method has not been treated to prevent corrosion, so it must be removed. This is a temporary reinforcement method based on the premise, and it requires a large area to install L-beam welding.
The narrow urban housing land situation was not suitable for its widespread use.

The present invention relates to a method for reinforcing a block wall, which eliminates the above-mentioned drawbacks and can strengthen earthquake resistance by attaching reinforcing materials to a block wall that is at risk of collapsing.

Hereinafter, the reinforcing method of the present invention will be explained in detail based on the drawings.

Existing block wall 1 as shown in Figures 1 and 2
Horizontal steel members 2 as horizontal reinforcing members are placed in close contact with the wall at regular intervals and fixed with bolts 3 from both sides. The vertical steel members 5 are connected and fixed to each other with bolts 3 via the block wall 1 and the horizontal steel members 2.

In addition, the vertical steel members 5 are arranged at intervals of 1.5 meters to 2.0 meters, and a necessary range of the foundation portion 4 is excavated to stand the vertical steel members 5 upright.

The steel used for this construction shall be treated to prevent corrosion, or be coated with paint or mortar to prevent corrosion.

In particular, in order to strengthen earthquake resistance, improve the appearance, and further strengthen the toughness of the vertical steel members 5, reinforcing concrete containing steel fibers is pre-formed into a semicircular shape along the periphery of the steel members. In step 6, an adhesive is applied to the fence and reinforced by splicing over the entire area of the vertical steel members 5 from the base portion 4 to the top of the fence. Note that this steel fiber-containing concrete 6 can also be formed into a mold so that it can completely cover the vertical steel members 5 by making cement mortar containing steel fibers on site. Further, it is preferable that the steel fibers have a size of 0.5 mm x 0.5 x 30 mm and are mixed in a proportion of about 1.0% to the concrete material.

Furthermore, in the above-described embodiments, the horizontal steel members 2 that are not covered with the steel fiber-containing concrete 6 may be omitted.

The present invention has the following features and effects.

(1) Since the block wall is reinforced from just above the foundation with vertical reinforcing material and concrete containing steel fibers, collapse can be prevented, and the reinforcement means is approximately the same as the standing area of the block wall. Therefore, only a small area is required compared to other methods.

(2) The vertical reinforcing material is entirely covered with concrete containing steel fibers, so it maintains weather resistance and does not lose its reinforcing effect.Furthermore, since the concrete also contains steel fibers, it has increased toughness and is reinforced. The effect can be further enhanced.

(3) The construction is simple, the construction period can be shortened using conventional reinforcement methods, and it can be done at a low cost.

(4) By constructing this reinforcement, it will be possible to demonstrate sufficient seismic resistance against earthquakes with a seismic intensity of about 6 (severe earthquake), and prevent the collapse of block walls as happened frequently in the Miyagi Prefecture-Oki Earthquake. I can do it.

[Brief explanation of drawings]

FIG. 1 is a plan view of a reinforced block wall for explaining the method for reinforcing a block wall according to the present invention, FIG. 2 is a cross-sectional view taken from FIG. 1, and FIG. 3 is a schematic diagram of the entire reinforced structure. It is. 1...Block wall, 2...Horizontal steel material (horizontal reinforcement material),
3... Bolt, 4... Foundation part, 5... Vertical steel material (vertical reinforcing material), 6... Concrete containing steel fiber.

Claims (1)

[Claims] 1. Reinforcers consisting of vertical reinforcements or horizontal reinforcements and vertical reinforcements are installed at regular intervals along both sides of an existing block wall, and these reinforcements are connected to each other with the block wall in between. A method for reinforcing a block wall, which comprises connecting and fixing the wall, and then covering and reinforcing the vertical reinforcing material with concrete mixed with steel fibers.