JPS5883729A - Prevention of drying of mud water-solidified continuous wall - Google Patents

Abstract

PURPOSE:To prevent the slackening and falling of the wall face of a continuous wall constructed with solidified hydrous mud by a method in which the wall is constructed with a hardenable mud water, and a liquid water retaining agent is coated by spraying on the wall face exposed by internal excavation of the continuous wall. CONSTITUTION:The ground is excavated while filling an underground trench with a hardenable mud water, and when the trench is excavated to a given depth, the hardenable mud water is allowed to stand as such in the underground trench, whereupon continuous wall constructed with solidified hydrous mud is constructed. Then, the inside ground is excavated by utilizing the continuous wall as a sheathing wall, and a water retaining agent composed of an acrylic-, urethane-, silicone-, synthetic rubber- and asphalt-based paints is sparyed or coated on the exposed wall face of the continuous wall.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for preventing drying of a continuous underground wall constructed by a mud water solidification method.

Conventionally, the hardening mud used as a stabilizing liquid when constructing continuous underground walls is generally composed of cement mainly composed of bentonite, Portland cement, or blast furnace slag, and an appropriate amount of a reaction retarder, and it hardens when left to stand still. do. The solidified body of hardening mud not only has excellent water-shielding performance, but also has a strength of about 30~SO￥i depending on the formulation, so it can be used as a 'P0 member or Hi! When used in conjunction with other members such as I, it is used as a temporary mountain retaining wall with excellent water-blocking properties.

By the way, the solidified body of hardening mud is lSO~3θo%
It is in a high water content state with a water content ratio of , and most of the water has the property of being easily evaporated.

Therefore, if a muddy wall made of hardening muddy water is exposed to the air for a long period of time due to internal ground excavation, drying progresses and the wall surface gradually falls off.

The object of the present invention has been made in view of the above-mentioned drawbacks, and is a method for easily and economically preventing wall surfaces from peeling off due to drying when muddy walls made of hardening muddy water are exposed to the air for a long period of time. Our goal is to provide the following.

According to the present invention, a muddy solidified continuous wall is created using hardening muddy water, and a liquid drying prevention method is applied to the wall surface of the continuous wall exposed due to internal excavation. The aim is to prevent

By spraying the liquid anti-drying agent onto the exposed wall surface, it has good adhesion to muddy water assimilation walls, good watertightness, good weather resistance, high elasticity, and easy handling during construction. It is desirable that the material meets various conditions such as being easy to use, and acrylic, urethane, silicone, synthetic rubber, and asphalt materials are good examples.

First, in the mud method, the ground is excavated while filling an underground trench with hardening mud water as a stabilizing liquid. Hardenable mud water in an underground trench formed by excavation to a predetermined depth is converted into a continuous wall of solidified mud water when left to stand still. The internal ground is excavated using the continuous wall as an earth retaining wall. The purpose is achieved by spraying the anti-drying agent onto the exposed wall surface of the continuous wall using a compressor or the like, or applying it using a brush or the like.

According to this invention, since the liquid anti-drying agent is sprayed and applied to the wall surface of the muddy water solidification continuous wall exposed by internal excavation, deterioration of the continuous wall due to flaking due to drying is prevented. .

It can be said to be an economical construction method.

Examples will be shown below to clarify the disadvantages of the present invention described above.

(Example) Table 1 is based on hardening muddy water! xlOcm of solidified specimens, one with untreated surface and one with surface treatment, were kept at room temperature.
The results are shown in which the degree of dryness and strength of the samples were measured by placing them in a curing room at 0° C. and 60% relative humidity.

According to this, it was confirmed that the solidified specimen with an untreated surface had a high drying rate, showing a weight loss due to water evaporation of 10% in 7 days and 30% in 2 days, and its strength also decreased significantly. It was done.

On the other hand, it was confirmed that for the solidified specimen coated with about 7% acrylic paint, it took 9 days for the weight loss rate to reach io% and 2S days for the weight loss rate to reach 20%.

Furthermore, when the same solidified specimen coated with acrylic paint was left outdoors and the degree of dryness was examined after one week of continuous sunny days, it showed a weight loss of 7 to 7 g%, and then due to rainfall, it lost its original weight. It was confirmed that it recovered to a moist state and did not show a weight loss of 70% or more even after 30 days or more, and was sufficiently durable for practical use.

Table - / Weight loss rate and strength of solidified specimen

Claims (1)

[Claims] A method for preventing drying of a muddy water solidified continuous wall, which comprises spraying and applying a liquid anti-drying agent to the excavated wall surface when excavating the internal ground using the muddy water solidified continuous wall as an earth retaining wall.