A Construction Technology of Underwater Gravel Paving Using Air Suction Dredge
A construction technique and suction dredger technology, applied in infrastructure engineering, caissons, buildings, etc., can solve problems that affect construction progress, difficult to handle, increase input costs, etc., to overcome uncontrollable filling volume, easy control of flatness, The effect of reliable quality assurance
Active Publication Date: 2021-01-05
CCCC SHEC FOURTH ENG +2
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Problems solved by technology
[0003] It has always been very difficult to fill caissons with underwater gravel, mainly because it is difficult to operate underwater, and it is difficult to make flexible adjustments at any time according to monitoring paving conditions
This difficulty is exacerbated by traditional gravel filling processes
The traditional underwater gravel filling process adopts crawler conveying, dumping, and grab lifting to dump the gravel directly into the bottom of the caisson well hole. The height of the gravel is highly dependent on the technology and experience of the construction personnel and cannot be quantitatively controlled. If there is less filling, it can continue to be poured. If the filling is too much, it will take a lot of time and manpower to dig out or be difficult to handle, and it is impossible to carry out multi-point distribution, which seriously affects the construction progress and greatly increases the input cost.
Method used
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Embodiment 1
[0017] In the Wufengshan Yangtze River Bridge, the north anchorage caisson adopts the crushed stone paving process of the present invention. The caisson well hole layout is as follows figure 2 As shown, the foundation of the caisson is 100.7m long, 72.1m wide, and 56m high, and is divided into 48 well holes in 6 rows (1# well to 6# well), with 8 holes in each row. Fill with gravel.
[0018] First pull and transport the gravel to the side of the 1# well hole in the first row, fill the 8 well holes of the first row 1# well with 2-3m of crushed stone through the discharge channel through the chute, and arrange 8 air suction pumps in the 1# well hole mud machine (one for each hole), and then use the suction dredge to pump and fill from the first row of well holes to the other five rows of well holes according to the filling sequence of 6#-5#-4#-3#-2#.
[0019] When filling the last row of well holes (2#), start to control the gravel elevation of the first row of well holes to e...
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The invention discloses an underwater gravel paving construction process adopting an air suction dredger. An open caisson hole is filled with gravels through a chute firstly, then the suction dredgersucks the gravels from the open caisson hole to other caisson holes for filling, the elevations of the gravels of the caisson holes are observed in real time, and the suction dredger is controlled towork till all the caisson holes are filled to the designed position. The method changes the situation that gravels are paved only through conveying or toppling of a caterpillar band or swinging of a grab bucket in the prior art, gravel filling with leaked filling and excessive filling being of common occurrence becomes controllable in quality, a guarantee is provided for concrete bottom sealing, multi-point distribution can be conducted, and the work efficiency is greatly improved.
Description
technical field [0001] The invention belongs to the technical field of construction, and in particular relates to an underwater gravel paving construction technology using an air suction dredger. Background technique [0002] Before the caisson is sunk in place for back sealing, it must be filled with gravel to level the foundation. The gravel filling layer is the foundation of the back-sealing concrete and the quality assurance of subsequent construction. Overfilling and missing filling will seriously affect the quality of the project. [0003] It has always been very difficult to fill caissons with underwater gravel, mainly because the underwater construction is difficult to operate, and it is difficult to flexibly adjust according to the monitoring of paving conditions at any time. This difficulty is exacerbated by traditional gravel filling processes. The traditional underwater gravel filling process adopts crawler conveying, dumping, and grab lifting to dump the grave...
Claims
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IPC IPC(8): E02D23/16E02D15/10
CPCE02D15/10E02D23/16
Inventor 汪成龙魏湛力钟永新石军王清阳
Owner CCCC SHEC FOURTH ENG