Circular Assembled Corrugated Pipe Culvert

Technical parameters of steel corrugated pipe culvert

1.Steel plate material: SS400 or Q235 or Q325 hot rolled steel plate.
2.Steel plate thickness: 1.6mm-12.0mm.
3.Technical assembly forms are: integrated type and assembled type.
4.According to the cross-section shape of the channel, it can be divided into round, oval, arch, horseshoe, dustpan, pear, etc.
5.According to the form of import and export, it can be divided into orthogonal and oblique; straight and oblique.
6.Filling height: 0.3-130m.
7.Pipe diameter (span): 0.5-16m.
8.The connection forms of nozzle joint are: inner flange connection, outer flange connection, plate lap, clamp connection, etc.
9.Waveform parameter: wave distance (p) × Wave depth (D) (mm)
68×13 75×25 125×25 150 x 50 200×55
230 x 64 300 x 110 380 x 140 400 x150
10.Anti-corrosion treatment: hot dip galvanizing ≥63 µ m; secondary anti-corrosion (generally additional asphalt coating).
11.Service life: ≥100 years.
Note: at present, the commonly used waveform is 68 when the diameter is ≤ 1.0m × 13，75 x 25, 125 × 25;
When 1.0m < diameter < 8.0m, use 150 × 50, 200 × 55, 230 × 64;
When diameter > 6.0m, use 300 × 110, 380 x 140 or 400 × 150.

Note: 1. The above product specifications are common specifications.
2. If customers need other products with special specifications, our company can specially design and process them according to technical requirements.

Note: the maximum filling height of integral corrugated steel pipe culvert can meet 40m. When the user determines that the culvert pipe used is high fill, it is necessary to notify the manufacturer four months in advance. The manufacturer shall carry out static checking calculation and adjust the technical parameters (wave distance, wave height, wall thickness, etc.) of the corrugated culvert pipe appropriately to meet the use requirements.

Application field of steel corrugated pipe culvert

1.Roads and railways: culverts, passages, small bridges, tunnels, culvert and tunnel overhaul, temporary access roads and seepage wells;
2.Municipal and construction: common ditch, optical cable protection, drainage ditch, tower crane cofferdam, vertical pile shell;
3.Coal mine: mineral transmission pipeline, personnel and mining machinery channel, shaft;
4.Civil: power plant flue, grain storage warehouse, fermentation tank, wind power generation;
5.Military: military access road, air defense passage and evacuation passage.

Advantages of steel corrugated pipe culvert

1.Steel corrugated pipe culvert has both rigidity and flexibility; the structure has reasonable stress, uniform load distribution and certain deformation resistance.
2.We adopt standardized design and large-scale production of the factory; short production cycle and high efficiency are conducive to reducing cost and improving quality.
3.The on-site installation speed is fast, the construction period is short, and the social and economic benefits are obvious.
4.Construction can be carried out all year round, and is not affected by seasons and the environment.
5.It can effectively solve the damage problem of concrete bridges and culverts caused by repeated frost heave in cold areas of Northern China.
6.It is especially suitable for special areas such as permafrost, expansive soil, soft soil and collapsible loess, and can avoid the damage of culvert caused by uneven settlement from foundation deformation.
7.Reducing the use of conventional building materials such as cement, sand and stones is of great significance for environmental protection.
8.Compared with concrete bridges and culverts, the comprehensive cost of steel corrugated pipe culverts with the same span is low.
9.The later maintenance workload is small and the maintenance cost is low.

Selection and construction technical requirements of steel corrugated pipe culvert

Selection process

The waveform parameters are selected according to the culvert pipe diameter and filling height
The thickness of steel plate is selected according to the filling height and special anti-corrosion requirements
The assembly form is selected according to the transportation conditions and installation environment

Construction technical requirements

1.Requirements for foundation and backfill materials

Steel corrugated pipe culvert is made of steel plate material, which has strong adaptability to deformation. The foundation material can be replaced with gravel, gravelly soil or sandy soil.

2.Compactness requirements

The foundation shall be compacted in layers by vibrating compaction machinery, and the compaction degree shall not be less than 93%; the wedge-shaped part of the pipe bottom can be tamped obliquely with small tamping machinery or with artificial wooden rods; backfilling on both sides shall be carried out symmetrically in layers, and the thickness of each layer shall not exceed 30cm; the compactness of both sides and top of culvert pipe is the same as that of subgrade at the same elevation; when the backfill thickness above the culvert exceeds 30cm, the roller shall be used for static pressure, and when it exceeds 50cm, the roller shall be used for vibration.

3.Backfill scope and thickness requirements

In frozen soil areas, the range on both sides of the culvert pipe is ≥ 0.5 times of the hole diameter (minimum 0.5m), and the thickness above the top of the culvert pipe is ≥ 0.5m (0.8m when the pipe diameter is greater than 3m). Gravel shall be filled within this rectangular range.

In non-frozen soil areas, gravel shall be filled below half of the pipe diameter on both sides of the culvert pipe, and the filling range on both sides shall be ≥ 0.5 times of the hole diameter (minimum 0.5m); more than half of the pipe diameters on both sides and the top can be filled with the same material as the subgrade filler.

Construction process flow

Preparation before construction → construction setting out → cofferdam setting → drainage and desilting → site leveling → foundation layered backfilling → detection of compactness and water content → leveling → site leveling → construction setting out → installation of culvert pipe → detection of longitudinal slope at culvert bottom → detection of culvert pipe sealing and spraying anti-corrosion coating → culvert pipe in place → wedge backfilling and compaction → wedge backfill and compaction → detection of compactness, water content, etc. → layered backfilling of pipe top → detection of compactness, water content, etc. → import and export treatment.

Installation process

Integral installation process (as shown in the figure):

gravel foundation