Externally arranged, compacted and grouted Larsen steel sheet pile composite retaining structure and use method thereof

Abstract

The invention relates to the field of pipeline laying on land or underground, in particular to an externally arranged, compacted and grouted Larsen steel sheet pile composite retaining structure and a use method thereof. The externally arranged, compacted and grouted Larsen steel sheet pile composite retaining structure comprises a top pipe (1) arranged in a foundation pit (10), and is characterized by further comprising Larsen piles (2), circuit purlins (3), connectors (4) and inner supporting pipes (5); all the Larsen piles (2) are vertically arranged in the foundation pit (10); and the circuit purlins (3) are horizontally arranged in the foundation pit (10). The use method of the externally arranged, compacted and grouted Larsen steel sheet pile composite retaining structure is characterized by comprising the following steps of inserting of the Larsen piles (2), compacting and grouting, soil blocked excavation, construction of the top pipe (1) and soil backfilling. The externally arranged, compacted and grouted Larsen steel sheet pile composite retaining structure is high in tensile strength, bending resistance, and environment adaptability.

Description

technical field [0001] The invention relates to the field of laying pipelines on land or underground, in particular to a Larsen steel sheet pile composite support structure with peripheral compaction grouting and a method for using the same. Background technique [0002] Most of the foundation pits involved in the municipal pipe jacking project are deep foundation pits that need to be maintained around. In the past, the newly built roads were located in the surrounding area of ​​the pipe jacking project construction area. Basically adopt the method of grading excavation to implement earthwork excavation. But in recent years, due to the shortening of the commissioning period, buildings close to the main project, such as supporting substations, are often constructed first. Pile method, due to the low tensile strength of cement mixing piles, must have a certain width to meet the strength requirements, which leads to too large width and cannot be used in narrow spaces; Due to ...

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Problems solved by technology

But in recent years, due to the shortening of the commissioning period, buildings close to the main project, such as supporting substations, are often constructed first. Pile method, due to the low tensile strength of cement mixing piles, must have a certain width to meet the strength requirements, which leads to too large width and cannot be used in narrow spaces; Due to the weak bending resistance of the concrete crown beam at the top, the excavation partition is relatively small, which affects the construction period and even cannot be constructed because the partition is too small; The foundations collide, and the construction cost is huge

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