1. U shape cold rolled steel sheet pile
U shape cold rolled steel sheet pile that features large section modulus (W=600~5200 cm3/m) is suitable for small and medium projects that bear relatively small earth (water) pressure, especially for temporary works. Depending on the different geological conditions, vibratory hammer with corresponding power is usually used for construction. In company with the progressive development of smelting technology, the width of single piece U hape cold rolled steel sheet pile reached up to 750mm after the year 2002, which has brought about the acceleration of construction.
Grand Piling U shape cold rolled steel sheet pile has the following advantages:
①This product is wider than common hot rolled steel sheet piles, and this means the reduction in time consumption of hoisting and pile sinks;
②The increase in width brings about the reduction of interlocks of walls per linear meter; In this way, the water sealing performance of wall body is directly improved, and the engineering cost is reduced; Good for watertightness
③The increase in height and use of high grade steel ensures the outstanding statics characteristics and reduces the weight of wall per linear meter;
④The uniform thickness of section board ensures the favorable rigidity of pile sinking;
⑤The high-tensile steel and advanced production equipment insures the performance of cold-bent steel sheet pile;
⑥Dedicated interlock designed through finite element analysis software ensures the repeated use of cold-bent steel sheet pile;
⑦The symmetrical structure and the provided rotation angle is conducive to the correction of construction deviation
2. Z shape cold rolled steel sheet pile
Z shaped cold rolled steel sheet pile has a large section modulus (W=1200~5015cm3/m) and is suitable for large, medium and small projects that bear relatively large earth (water) pressure. Based on the characteristics of Z-shaped cold-bent steel sheet pile, two pieces are usually combined into one group for driving. Although its construction procedure is slightly longer and technical difficulty is higher than that of U-shaped cold bent steel sheet pile, its overall construction efficiency is higher since the group composed of two pieces of piles may have a width of 1160~1400mm, nearly 2~3 times the width of single piece of U-shaped cold-bent steel sheet pile; hence, Z-shaped cold-bent steel sheet piles have been widely used for a lot of dock projects of China that has a requirement for land-based area. Normally, the construction method is "pile pitching through vibration, and then pile sinking through hammering".
The most essential mechanical property of Z-shaped cold-bent steel sheet pile is the continuity of web and the symmetrical distribution of interlocks at specified positions at both sides of neutral axis, both have positive effect on section modulus of cold-bent steel sheet pile.
Grand Piling Z-shaped cold rolled steel sheet pile has the following merits:
① Flexible design and resultant relatively high section modulus and mass ratio;
② Increase in moment inertia of section, improvement of bending rigidity of overall piling wall, and effective reduction of displacement deformation;
③ GPZ cold-bent steel sheet pile is wider than conventional cold-bent steel sheet piles, and this means the effective reduction of time consumption of hoisting and piling;
④ The use of high tensile steel remarkably improves the bending strength of cold-bent steel sheet pile wall;
⑤ The increase in section width brings about the reduction of interlocks of sheet-pile wall, which directly improves the water sealing performance of sheet-pile wall.
3 Straight cold-bent steel sheet pile
Straight cold rolled steel sheet pile has a relatively small section modulus; however, its interlock has a strong resistance to horizontal tension that is up to 5500 kN/m; straight cold-bent steel sheet pile is applicable for large round built island cofferdam that bears horizontal tensile in horizontal direction and suitable for grid-shaped cold-bent steel sheet pile gravity wharf project; the construction of straight cold-bent steel sheet pile is very convenient
4 L type and S type cold rolled steel sheet pile, or called omega type steel sheet piling
The interlock of both L shaped and S shaped cold rolled steel sheet pile is located at one side of cold-bent steel sheet pile wall. Compared with U-shaped and Z-shaped cold-bent steel sheet piles, L-shaped and S-shaped light-duty cold-bent steel sheet piles feature light section, small space occupancy of piling wall, the same orientation of interlocks and convenient construction etc. and are applicable to small-range excavation projects such as municipal work