When it comes to small foundation pit support excavation, especially municipal projects, steel sheet piles are the most common and relatively cost-effective support method. Steel sheet pile is a type of steel with a lock. The cross-sections include linear, Z-shaped, U-shaped, H-shaped, hat-shaped, etc.
Steel sheet piles are divided into two types according to production technology: cold-formed steel sheet piles and hot-rolled steel sheet piles, with the latter taking the lead. There are many different sizes, models and locking forms, such as the most commonly used Larson steel sheet pile. Why is it called Larson? Because the engineer who invented this steel sheet pile is called Larson. The so-called Larsen is a U-shaped riveted interlocking steel sheet pile. In short, it is a steel sheet pile designed with a U-shaped protruding cross-section and can be used to interlock adjacent steel sheet piles.
Excavation and support construction is a key process that determines the success or failure of the foundation pit project. The sequence of steel sheet pile support is generally: Detect underground obstacles→Level the site and determine pile locations→Suppress steel sheet piles→Construct dewatering and drainage measures→Excavate and erect supports (or pull anchors)→ Excavation to the bottom of the foundation pit and timely foundation treatment (if any, or treatment in advance) → Construction of cushion and main structure and timely and gradual backfilling → Backfilling to the site level → Recycling of steel sheet piles → Continue backfilling to the designed ground level.
Advantages of steel sheet piles
(1) The steel plate provides resistance during installation stress;
(2) Extremely light weight, easier to lift and carry;
(3) Steel plates are reusable and recyclable;
(3) Has a long life both above and below water;
(4) The pile length is easily adapted and can be welded or bolted to make it work;
(5) Has stronger joints that can withstand the force of being driven into place.
Disadvantages of steel sheet piles
(1) Higher cost: Steel sheet piles require high-strength materials and are relatively expensive, usually more expensive than ordinary piles.
(2) The construction process has a great impact on the surrounding environment: steel sheet piles need to be excavated and constructed inside the wall, which may have a huge impact on the surrounding environment, especially in busy areas, and may interfere with surrounding commercial activities and traffic situations.
(3) Large spacing between pile bodies: The spacing between steel sheet piles is usually relatively large, which may cause deformation after long-term use.
Article source: https://article-realm.com/article/Business/53428-Advantages-and-disadvantages-of-steel-sheet-piles.html
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