4. The 1 gradient that put delay, center catchment to install plan to accelerate steel tube of glass of ground of the beach on the island, make full use of tidewater goes up, fall time, when seawater refluent when designing bottom tall Cheng to groove, have to begin the excavate of groove. In the excavate process of groove, the eduction inside the short time that cannot be in a few hours as a result of the seawater in beach, water content of groove periphery sanded form is big, incidental quicksand, cave in phenomenon.
To assure the stability of excavate edge slope, besides change delay excavate gradient, from 1: 1 add to 1: 1.5, use grab of wide pedrail PC-200 to be gone to by the bottom altitude excavate groove in order to accelerate excavate rate outside, be in ' when installing every glass steel tube. Want the side outside be in charge of, rely on open waters side namely, 2-3 of the artificial puddle that dig collect, pit depth with can flooding sumbersible pump advisable, next put away trashrack, undertake is in more centralized catchment, assure the unapt happening that reach the happening of cave in phenomenon quicksand to groove makes an appointment with slope of the edge inside 10 meters long range.
4. 2 improve installation technology, seasonable backfill sandy soil checks and accept qualification hind when groove excavate section and tall Cheng, can have the setup of vitreous steel tube, because the join of vitreous steel tube uses FWC contact, with Tong of prestressing force reinforcing steel bar bear the connect that insert type is different, if use the installation method that Tong of prestressing force reinforcing steel bar provides completely, can be get half the result with twice the effort only, for this, good in the light of this connect sealing, tube head inserts the characteristic with block muscularity, light weight, use the method that lubricate and places photograph union gently, accelerate the installation rate of vitreous steel tube greatly. Its construction working procedure is as follows: Before installation, rinse FWC connect clean, wipe, go up in besmear of balata of shut-off of water of FWC connect inside lubricant; When installation, carry artificially vitreous steel tube is contrapuntal, wait for after chain block is taut, installation worker will be in charge of another end to raise, control swing gently vitreous steel tube, accomplish slow and taut and swing to be coordinated at the same time gently undertake, till reach design place. After the installation tall Cheng that is in charge of in the examination, axes and perch accord with a design to ask, can undertake tubal the sanded backfill of two side equably with semmetry, backfill carries above 60cm on the head to the canal thick can, the backfill Sha Ke of the others need not backfill, wait for at high tide, use tidewater to erode, can recover beach ground to come place appearance, can save backfill time. Such, achieve already accelerate installation rate, saved backfill time, be helpful for the successful excavate of groove, carry backfill arenaceous ballast on the head through the canal again, solved float of vitreous steel tube canal, change, the problem that be out of line. 4-3 seals a nozzle. Because the groove of excavate is in,establish firm surveyor's pole at high tide, can be rushed to fill extensive to recover from an illness by ocean wave appearance, be like glass reinforced plastics two upright nozzle did not seal tubal head, remaining part in time had blocked up, inside seawater and the valve that already had installed fill person dene, cause a large number of silt inside the canal, can tear open a canal to take the process such as sanded, new excavate, installation only, affected time limit for a project not only so and affected project quality, caused pecuniary loss: If did not establish firm surveyor's pole, last nozzle that installs so needs remeasure to control fixed position. So, in remove everyday before field, must use nozzle reliable blind board had blocked up, fill sufficient sand, lest blind board changes, consistent lever makes good mark, will not blind excavate, dig bad pipe.
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