JPS59150861A - Hanging construction method of fragile matter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for constructing a brittle object such as rock or concrete with little influence on the surface below.

Traditionally, when the concrete surface of a chemical factory, food factory, etc., such as a concrete floor or wall, is damaged, the damaged part is removed by chiseling and then concrete is poured again to repair it.Currently, however, this chiseling work is Since it is done manually, it requires a lot of effort.

Therefore, the present inventors conducted research in search of an easy-to-perform chisel method, and found that, for example, when hydrating and digesting quicklime or dolomite, which are currently commercially available for breaking brittle objects such as rocks or concrete, The objective can be achieved by using a rupturing agent containing a substance that causes expansion, making the hole for filling the brittle object with the rupturing agent into a groove shape, and specifying the size and spacing of the grooves and the method for filling the rupturing agent. This knowledge led us to complete the present invention.

That is, the present invention involves forming a large number of grooves at approximately equal intervals on the surface of a brittle object such as a concrete structure or rock, the depth of which is approximately the same as the depth of the vine, and one of the grooves.
The gist of the device is to fill each tube with an expandable substance and to make it expand depending on the expansion pressure.

The expansible substance used in the present invention is "Calmite" (product name below) manufactured by Nippon Cement Co., Ltd., which is currently commercially available as a slow crushing agent or a static crushing agent for breaking brittle objects such as rocks or concrete. Substances that expand in volume during hydration and digestion, such as "Plystar" manufactured by Onoda Cement Co., Ltd. and "S Mite" manufactured by Sumitomo Cement Co., Ltd., quicklime or dolomite, or substances that expand due to phase change or other chemical reactions. can be used.

The holes filled with these expandable substances are groove-shaped as shown in the figure.
It is preferable that the width a is 115 or less of the depth h.

If the width of the groove exceeds the depth by 115 mm, the expansion pressure will escape toward the upper opening of the groove, and the expansion pressure acting on the side walls of the groove will become small, making it difficult to properly lift the groove.

Also, the depth of the groove needs to be the same as the depth of the vine. If a groove is shallower than the vine depth, some parts will remain unhanged, and on the other hand, if a groove is deeper than the vine depth, the vine will be too tight.

In this case, the volume of the groove is equal to the sum of the volumes of the object to be lifted, which are in contact with both sides of the groove, although it also depends on the strength of the object to be lifted.
A rough guideline is to set it between /30 and 1/100. 1/
If it is less than 100, the amount of expandable substance filled in the groove is too small, and the resulting expansion pressure is small, which may result in insufficient growth.

Although it is not necessarily necessary that the grooves to be filled with the expandable substance and the grooves to be filled with the expandable substance be the same size, from the viewpoint of workability, it is better to make them the same size.

When installing these grooves, for example, when cutting a reinforced concrete surface with a concrete compressive strength of about 210 K gf/cm2, the expansion pressure should be 200 K gf/cm2.
When using an expansible material having a value of about K gf/cm2 or more, it is preferable that the groove spacing is 2.5 times the depth h or less, and the grooves are spaced at approximately equal intervals. If the spacing is 2.5 times or more the depth of the groove, the lifting will not be done uniformly, leaving some parts uncut, and cracking may occur in areas deeper than the groove depth that should not be lifted. . However, by setting the spacing between the grooves to 2.5 times the depth or less, and making them approximately equally spaced, it is possible to completely cover the surface to be lifted and to hang neatly.

When filling grooves with an expandable substance, it is essential to fill every other groove, and if all grooves are filled, both ends will peel off, but the center portion will remain intact. Therefore, it must be avoided.

According to the method of the present invention, hanging can be done more easily and neatly than in the conventional method.

The present invention will be explained below based on examples.

The concrete surface is 7.5cm deep and 170CIl wide.
11 length, 3300! It corresponds to the vine, width 4mm,
Grooves with a depth of 7.5 cm and a length of 330 cm were provided at 12 cm intervals, and in every other groove, a slurry made by adding water and kneading commercially available "Plystar" manufactured by Onoda Cement Co., Ltd. was poured. It's here. 24 hours after pouring, the hanging surface was raised, and I was able to hang it cleanly just by tapping it lightly with a hammer.

Tomo I”L Concrete surface 2Qcm deep, 200cm wide
The length is 200cm, and the width is 10IllII11.
Grooves with a depth of 2Qcm and a length of 2000+11 were provided at intervals of 5Qcm, and a slurry made by adding water to commercially available "Plystar" manufactured by Onoda Cement Co., Ltd. was poured into every other groove. 24 hours after pouring, the surface of the hanging surface rose, and when I tapped it lightly with a hammer, I was able to hang it cleanly.

Comparative example 1 The concrete surface is 6 CIl 11 deep and 1 oocm wide.

Length 200 cm corresponds to the vine, width 4111I111
Grooves with a depth of 60I11 and a length of 200011 were made at 5cm intervals, and a slurry made by adding water to commercially available "Plystar" manufactured by Onoda Cement Co., Ltd. was poured into all of these grooves. 24 hours after pouring. Only the ends came off, but the center part did not change at all and could not be removed with just a light tap with a hammer.This part required the same amount of effort as before and was finally able to be removed.

[Brief explanation of drawings]

The drawing is a partially vertical perspective view showing an example of a construction state of the construction method of the present invention. Patent applicant: Kannagawa Keima Nippon Cement Co., Ltd.

Claims (1)

[Claims] (1) When scraping the surface of a brittle object such as a concrete structure or rock, a large number of grooves with approximately the same depth as the groove depth are formed at approximately equal intervals on the surface of the object, and every other groove is expanded. A method for chiseling brittle objects, which is characterized by filling the material with a resilient material and causing it to break due to its expansion pressure. (2) A method for chiseling a brittle object according to claim (1), wherein the width of the groove filled with the expandable substance is 115 or less of the depth. ■ The distance between the grooves is approximately 2.5 times the depth of the groove or less,
In addition, the groove is filled with an expandable substance that exhibits an expansion pressure of approximately 200 Kgf/cm2 or more.
Chiseling method for brittle objects described in item 1) or item (■).