METHOD FOR INJECTING HARDENING GROUT INTO GROUND BENEATH GROUNDWATER

• Main Authors: WAKANA KAZUYUKI, SHIMODA KAZUO
• Format: Patent
• Language: English; Japanese
• Published: 13.02.2020
• Subjects: EMBANKMENTS; EXCAVATIONS; FIXED CONSTRUCTIONS; FOUNDATIONS; HYDRAULIC ENGINEERING; SOIL SHIFTING; UNDERGROUND OR UNDERWATER STRUCTURES

To provide a method for injecting hardening grout into the ground beneath groundwater in which there is no delay in gelling time for grout when the grout fills the ground beneath groundwater and becomes diluted, and sufficient strength occurs early.SOLUTION: Hardening grout is made by mixing cement milk solution A that includes 500 to 1,200 kg of cement per 1 mand liquid glass solution B of 20 to 35% concentration in volume with respect to SiOwith 2.5 to 4.0 molar ratio using a ratio of 130 to 500 L to the solution A of 1 m. Assuming that the hardening grout is diluted by groundwater to a predetermined dilution ratio within 3 times, the hardening grout is injected into the ground beneath groundwater. The hardening grout is compounded so that a delay in gelling time is within 15 seconds when the grout is diluted by water to the assumed, predetermined dilution ratio compared with the gelling time for the standard compound before the dilution, and the uniaxial compression strength 3 hours after the grout is diluted by water to the predetermined dilution ratio is 0.15 N/mmor more.SELECTED DRAWING: None 【課題】地下水下の地盤に充填されて希釈されてもグラウトがゲル化タイムの遅延が少なく、且つ、早期強度の発現が充分である硬化グラウトの地下水下地盤注入方法を提供する。【解決手段】硬化グラウトを、１ｍ3あたりセメント５００〜１，２００ｋｇを含んだセメントミルクのＡ液に、モル比２．５〜４．０のＳｉＯ2の容量で２０〜３５％の濃度の水ガラスのＢ液を、Ａ液１ｍ3に対して１３０〜５００Ｌの比率で混合したものであり、前記硬化グラウトが地下水で３倍以内の所定の希釈倍率に希釈されることを想定して、希釈前の基本配合のゲルタイムと比べて想定した前記所定の希釈倍率に水で希釈されたゲルタイムの遅延が１５秒以内で、且つ、前記所定の希釈倍率に水で希釈された３時間後の一軸圧縮強度が０．１５Ｎ／ｍｍ2以上となるように配合した前記硬化グラウトを地下水下地盤に注入する。【選択図】なし