A vibration compaction method for foundation pit backfilling sand

Abstract

The invention discloses a vibration-compacting method for foundation pit backfill sand, which comprises the following steps: 1) driving steel sheet piles; 2) supporting a pair of steel sheet piles through purlins and support rods; 3) excavating the foundation pit; 4 ) The pipe gallery structure construction is placed in the foundation pit; 5) The sides and top of the pipe gallery are backfilled with sand; 6) The backfilled sand in the foundation pit is filled with water for preliminary compaction; 7) The purlins and support rods are removed; 8) Vibration hammer is used Clamp the steel sheet pile, pull out the steel sheet pile by vibration, and use the vibration force of the pile to compact the backfill sand; 9) Check the density of the backfill sand at one time; 10) Backfill the surface soil and complete the project. The use of mechanical compaction instead of manual compaction avoids manual work in poor environments and improves the working environment; one-time backfilling of sand reduces multiple conversions of processes, speeds up the construction progress, saves layered inspections, and reduces costs.

Description

technical field [0001] The invention relates to the technical field of building construction, in particular to a method for vibrating and compacting foundation pit backfill sand. Background technique [0002] The existing foundation pit backfilling sand compaction usually adopts the layered compaction method. The layered compaction method has the following disadvantages: 1. Since the distance between the comprehensive pipe gallery and the steel sheet pile foundation pit wall is only about 1 meter, the traditional manual hand jumping ramming method is used. , the working space is narrow, safety accidents such as bruises are prone to occur, the working environment is humid, and the quality of manual work is difficult to control; 2. The traditional manual compaction energy is small, the layers are flat and compact, and the layers are inspected. Only after passing the inspection can the upper layer be filled Sand has many process conversions and low efficiency; 3. Generally, the...

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Problems solved by technology

[0002] The existing foundation pit backfilling sand compaction usually adopts the layered compaction method. The layered compaction method has the following disadvantages: 1. Since the distance between the comprehensive pipe gallery and the steel sheet pile foundation pit wall is only about 1 meter, the traditional manual hand jumping ramming method is used. , the working space is narrow, safety accidents such as bruises are prone to occur, the working environment is humid, and the quality of manual work is difficult to control; 2. The traditional manual compaction energy is small, the layers are flat and compact, and the layers are inspected. Only after passing the inspection can the upper layer be filled Sand has many process conversions and low efficiency; 3. Generally, the layers of sand filling are more than 20 layers, and the inspection is carried out in layers, and the inspection cost is relatively high; 4. The manual compaction method is used for layered and layered compaction and detection of density. Pile, pulling out the pile will bring out the mud, and the backfill sand will be re-arranged and combined by vibration and liquefaction, and the density will change accordingly, and the detection of the density is not the final state of the density, and the detection loses its due meaning

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