The key technical contents during the construction of corrugated steel pipe culvert are: setting of the reserved arch, compaction of backfill, control of tightness between pipe joints, etc. Eliminate hidden quality problems and eliminate rework to achieve environmental protection and energy-saving benefits.
The corrugated pipe buried in the general soil foundation, often temporal settlement, and often the middle of the pipe body is greater than the two ends. Considering the water flow requirements and structural integrity, the longitudinal reserved arch of the foundation should be set to realize the reserved arch of the pipe body. The size of the reserved arch is considered according to the possible linkage of the foundation soil, the longitudinal slope of the culvert bottom and the height of the fill, etc. The longitudinal reserved arch of the foundation in the culvert pipe is generally 0.5% to 1% (generally 0.6%), and the maximum should not be greater than 2% to ensure that the middle of the pipe body does not appear depressed or longitudinal slippage.
The backfill on both sides of the culvert pipe should be gravel or the same material as the roadbed fill. Backfill on both sides of culvert pipe should be constructed symmetrically, backfill in layers, the thickness of each layer is 500px. both sides of culvert pipe near the mechanical tamping, coarse sand under the pipe with "watertight method" vibrator vibration. The backfill on both sides of the culvert pipe should be tamped with vibrating rammer layer by layer. The compactness is not less than 96%. When the top of the pipe backfill thickness of more than 1250px, the use of roller static pressure; fill thickness of more than 1500px, the use of roller vibratory compaction, compaction degree of not less than 96%.
Adopt coarse sand "watertight method" oscillator to compact, or use fluid fly ash backfill, or cement slurry pouring.
Also can choose the maximum particle size of not more than 75px of graded gravel backfill, with a small tamping machine oblique tamping to ensure the quality of the bottom of the pipe backfill.
The longitudinal construction order can be from the middle to both ends of the culvert; for the two end walls that have been completed can also be advanced from both ends to the middle.
Outside 0.6m of the maximum diameter of the pipe body on both sides can use 18Troller to crush, and within 0.6m must use small ramming machinery to compact, in order to avoid the impact of large mechanical equipment such as roller on the pipe culvert. The filling should be filled in layers and compacted in layers, the thickness of each layer after compaction is 500px, and the compaction degree is required to reach 96% before the next layer is filled.
When assembling the bottom plate, take the center axis and the midpoint of the pipe body as the benchmark, position the first corrugated plate and extend it to both sides as the starting point until both ends of the culvert import and export. When assembling the ring, it is assembled from the bottom to the top in order, the axial lap width is 120mm, and the top plate of the lap part covers the bottom plate.
After all the culvert pipe assembling is completed, use a fixed-torque electric wrench to tighten all the bolts in order according to the pre-tightening force, without missing. In order to ensure the required value of bolt torque, 2% of the bolts on the longitudinal connection joints of the structure were randomly selected before backfilling and tested with a torque wrench for sampling. After the bolts are tightened and meet the requirements, special sealing materials are used at the steel plate connections and bolt holes. After installation, evenly coat hot asphalt or emulsified asphalt inside and outside the pipe, and the coating thickness should be not less than 1mm.
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