Since the ancient mountains have no tracks, there are no bridges and there is no connection. With the wisdom of “four or two poundsâ€, the bridge is not well communicated in the sea and on the rivers. It connects the roads and creates the landscape. It can be said to consolidate the concept of human beings and become a bright pearl in the history of human architecture. However, during the effective construction period, the bridges across the sea (江, and) are affected by factors such as tides, typhoons, heavy fog, rainfall, navigation, etc., and the bridges across the sea (river, river) are due to the alluvial effect of the water, the sea (江, The river bed basically consists of the following weak layers: sub-sand, silty clay, clay, cohesive soil, clay and silt layer, and even some layers of confined water, especially the seabed of the sea-crossing bridge To a dozens of meters of shell permeable layer, which brings great difficulties to the pile foundation hole. Along with the tides of the sea, the complex seabed geological conditions, especially in the construction of the pile foundation, the positioning, insertion and pile foundation of the steel casing have great risks, and some may even cause irreparable damage. If the steel casing is deformed after the insertion is completed, the pile-based construction pile drill bit cannot be drilled, and the hole formation is even more difficult to talk about. Second, the steps to deal with the leakage of the deformed steel casing are as follows: The Touch Screen Monitor allows the user to operate the host computer simply by touching the icon or text on the computer display screen with his finger, thus getting rid of keyboard and mouse operations and making the human-computer interaction more straightforward. Mainly used in information inquiry in public halls, leading offices, electronic games, song and order, multimedia teaching, air ticket / train ticket pre-sale, etc. The products are mainly divided into three types: capacitive touch screen, resistive touch screen and surface acoustic wave touch screen. industrial touch monitor,industrial touch screen monitors,industrial grade touch screen monitor,industrial touch display,industrial display monitors,industrial touch screen displays Shenzhen Hengstar Technology Co., Ltd. , https://www.angeltondal.com
In order to solve the problem of deformation of the steel casing, the general method is to remove the deformed steel casing, and then re-reinforce the treatment and then insert it, but the cost of extraction and reinforcement is remarkable. In the construction, not all the pile foundation conditions are unsatisfactory, if processing steel protection During the process of the cylinder, all the steel guard legs and the entire cylinder wall are strengthened or thickened, which is bound to cause huge waste. After all, the steel casing plays a role in assisting the hole formation and is not used for permanent engineering.
1. Underwater cutting the locally deformed steel casing;
first step:
a. Sweeping and changing the slurry before the underwater cutting treatment of the deformed steel casing;
b. After the sweeping and changing of the steel casing, the deformation of the steel casing before the underwater cutting is carried out, that is, the steel casing with the same diameter of 80cm is placed in the casing and the temporary steel is measured. The distance from the bottom of the casing to the bottom of the steel casing to determine the specific length of the underwater cutting of the steel casing, before the underwater cutting, the diver must be sent to the water to perform underwater re-exploration of the steel casing, to clear the bottom of the casing The specific circumstances include whether the soil cleaning of the bottom of the casing is clean, the direction of deformation of the casing and the degree of deformation to determine the specific location and method of underwater cutting;
c. According to the preliminary data of the deformation of the steel casing, analyze the deformation degree of the steel casing, determine the starting height of the underwater cutting, determine the underwater cutting method according to the re-exploration situation, and accurately determine the deformation direction of the casing, according to its deformation The direction is cut by cutting out the 1/3 or 1/2 circumferential steel casing; for the inability to accurately determine the direction of deformation of the casing, the underwater cutting is performed by cutting the entire circumference.
The second step:
a. After the steel casing is cut, the mixture of cemented sand and cement 5:1 is backfilled into the casing to 10.0m above the cutting mouth at the bottom of the casing, and the deposit is dense for more than 7 days. After the cement and clay are combined, the slurry is drilled. It is required to drill into the money hole to reach a density of 1.2t/m3 and a colloidal rate of more than 98, and to make a slurry in the adjacent hole, to replenish at any time, to drill the final hole, and to replenish the slurry in the process of the lower steel cage, focusing on Strengthen the backfilling speed and deposition time control;
b. Send the diver down to the periphery of the steel casing for exploration, and the cavity can be plugged by grouting;
c. Prepare the high-viscosity and low-grade slurry material protection hole before cutting the deformed steel casing. Immediately after the steel casing is cut and hoisted, the slurry material is poured underwater, and the hole is insulated from the contact between the base soil layer and the seawater. After 1 day, the strength of I~3Mpa is formed, and then the slurry is drilled.