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Use of air curtain sinking caisson construction methods and characteristics


Next, again the wall in the final model. Good pouring concrete caisson an appropriate niche gas intensity profile, remove the outer mold the shape of the left gas niches, tip in the vertebral drill a small hole leading to the level of machine mm plastic tube compressor. Niche on the number and arrangement of gas method, in principle, should be close lower caisson, the upper can be thin. According to Japanese data sink depth 30 ~ 50m, Figure 5 re-rate in the 1.5t / m around the caisson, the role of each gas niche area 2.2 ~ 3.0m. And the persons to 100 ~ 130m deep, heavy rate 2.5f / m of the caisson is 1.8 ~ 2.4m. . According to our test results, the average effect of each gas niche area of about 1.0 ~ 1.6m recommended for the proper, this is sinking in the process of considering some gas niche may be blocked, some air curtain has high efficiency. 3.2 Layout of pressure tracheal Road (1) if not sinking, sinking depth is not deep, it can only set up risers, air jet holes drilled in the standpipe, so that straight line, pressure loss, gas niche also easy to plug, the author of \But the line more,[link widoczny dla zalogowanych], the corresponding high pick in the caisson, to take over the workload also increased. (2) To save pipelines, risers and level can also be taken by way of loop and the jet hole is located on the horizontal loop. However, levels of each standpipe connecting the root of the number of loop supply not more than 3 ~ 4. Should set the loop at both ends of the level of sand storage tube, to avoid or reduce sediment clogging gas niches. Pressure pipe and fittings should seek straight road, no leakage, to reduce the pressure loss. 3.3 The depth of compressed air pressure and sink deep buried depth of the relationship between the different niches of the gas are not the same density requirements laid as deep well pressure gas, the gas emitted following rises in the mural, and also play a role in the above Therefore, the increase is not necessarily proportional to the density of gas niches, so gas will not affect the niche less pressure gas effect. It can be seen from the experimental data: the depth of sinking air curtain around the 4Om caisson, compressed air pressure is generally 40 ~ 6SN/cm, and sank deep in the 50m air curtain around the caisson,[link widoczny dla zalogowanych], compressed air pressure is generally 30 ~ a0N / cm. . Experience has shown that pressure as long as the larger niche in the outside air pressure (earth pressure + water pressure + adhesion) can be, but considering the skew gi Thistle sinking and gas from the passive earth pressure air from the air compressor package to the top of the output by the well niches along the pipeline gas pressure loss factors such as bending joints, the pressure can be increased to the equivalent gas pressure niche theory of embedded depth of 1.5 times. Such as the beard to increase pressure, of course, but also an appropriate increase in gas pressure effect, but not obvious, nor the economy in general should not be used. Therefore, the depth of the sink in the 40m air curtain within the caisson, direct access to low-pressure suction sinking air supply system, do not have to reprovision high-pressure air supply system, but must be equipped with a total capacity of not less than the required compressed air pressure of air per minute The reservoir of the total wind Yao (commonly known as air bag), each of 40 gas niches test data obtained from the average gas consumption is 0.02m. / Mi ugly. Both rates of 3.4 and gas Shen niche Density As mentioned earlier, different densities of air shrine,[link widoczny dla zalogowanych], the friction when compressed air along with the reduction in the degree varied. However, different rates of re-caisson, the requirements on the gas density is different niches. Because the re-rate big to overcome large frictional resistance,[link widoczny dla zalogowanych], even less gas niches, but also to complete the sink. On the contrary, the sinking rate of weight is only a small reduction of Ci to a certain degree of friction, (to increase the number of air shrine) to make r the sink. 4 air curtain and a few basic features of Shen (1) air curtain in the clay in general also have very good use of effects, and in the larger water content of clay, sand soil total of filial piety, sticky sand used as an air curtain caisson sinking means, the effect is not worse than the sand. Generally reduce the friction of 30 or more. The use of air curtain in the sand more pronounced these effects. (2) test proved that increasing the gas pressure can increase the density of niches gas effect. Therefore, if conditions allow,[link widoczny dla zalogowanych], more appropriate niche will help set a number of air caisson sinking fast. But the specific issues of black and must be specific, as well re-rate it sunk, buried depth, geology, construction conditions, the shape of sinking and so on. (3) General re-rate Zt / m around the caisson, as long as the taking of measures to avoid the large loss of air pressure, the use of ordinary air compressor air bag together with sufficient capacity, you can Sinking to a depth of about 50m. Therefore, by sinking sinking air curtain technology is not complicated, and bring about economic, quality, duration of effect is obvious.
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