V Inspection, hoisting, and stacking of sheet piles
1. Inspection of sheet piles
For sheet piles, there are generally material inspection and visual inspection to correct sheet piles that do not meet requirements in order to reduce difficulties during the piling process.
(1) Visual inspection: including surface defects, length, width, thickness, end rectangular ratio, straightness, and lock shape. Note:
a. Welded parts that affect the driving of sheet piles should be removed;
b. Cut holes and section defects should be reinforced;
c. If the sheet pile is severely corroded, measure its actual section thickness. In principle, all sheet piles should undergo visual quality inspection.
(2) Material inspection: comprehensive testing of the chemical composition and mechanical properties of the base material of the sheet pile. This includes chemical composition analysis of the steel, tensile and bending tests of components, lock strength tests, and elongation tests. Each specification of sheet pile should undergo at least one tensile and bending test; two specimen tests should be conducted for sheet piles weighing 20-50t.
2. Lifting of steel sheet piles
The loading and unloading of steel sheet piles should be carried out by two-point lifting. When lifting, the number of steel sheet piles lifted each time should not be too many, and care should be taken to protect the lock to avoid damage. The lifting methods include bundle lifting and single lifting. Bundle lifting usually uses steel cables for bundling, while single lifting often uses special lifting equipment.
3. Stacking of steel sheet piles
The location for stacking steel sheet piles should be selected on a flat and solid site that will not sink or deform due to heavy pressure, and it should be easy to transport to the piling construction site. When stacking, attention should be paid to the following:
(1) The order, position, direction and plane layout of stacking should be considered in consideration of future construction;
(2) Steel sheet piles should be stacked according to model, specification and length, and signs should be set up at the stacking location;
(3) Steel sheet piles should be stacked in layers, with the number of piles in each layer generally not exceeding 5. Sleepers should be placed between each layer, with the spacing between sleepers generally being 3 to 4 meters, and the upper and lower layers of sleepers should be on the same vertical line. The total stacking height should not exceed 2 meters.
VI. Installation of guide frame.
In the construction of steel sheet piles, in order to ensure the correct position of the pile axis and the verticality of the pile, control the pile driving accuracy, prevent the buckling deformation of the sheet pile and improve the penetration capacity of the pile, a guide frame with a certain rigidity, also known as “construction purlin”, is generally installed. The guide frame adopts a single-layer double-sided form, usually composed of a guide beam and purlin piles. The spacing of the purlin piles is generally 2.5~3.5m. The spacing between the double-sided purlins should not be too large, generally slightly larger than the thickness of the sheet pile wall by 8~15mm. When installing the guide frame, the following points should be noted:
1) Use theodolite and level to control and adjust the position of the guide beam.
2) The height of the guide beam should be appropriate, which should be conducive to controlling the construction height of the steel sheet pile and improving the construction efficiency.
3) The guide beam should not sink or deform as the steel sheet pile is driven deeper.
4) The position of the guide beam should be as vertical as possible and should not collide with the steel sheet pile.
To be continued,
Yantai Juxiang Construction Machinery Co., Ltd. is one of the largest excavator attachment design and manufacturing companies in China. Juxiang Machinery has 16 years of experience in pile driver manufacturing, more than 50 research and development engineers, and produces over 2000 sets of pile driving equipment annually. It maintains close cooperation with domestic first-line machine manufacturers such as Sany, XCMG, and Liugong. Juxiang Machinery’s pile driving equipment is well-crafted, technologically advanced, and has been sold to 18 countries worldwide, receiving unanimous praise. Juxiang has the outstanding ability to provide customers with systematic and complete engineering equipment and solutions, and is a trustworthy engineering equipment solution service provider.
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Post time: Jul-02-2024