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Dynamic compaction machine construction real-time monitoring method and system based on pounder impact acceleration measurement

A technology of acceleration measurement and real-time monitoring, applied in infrastructure engineering, on-site foundation soil survey, soil protection and other directions, can solve problems such as inability to guarantee vision sensors, blocking sensor measurement, harsh construction environment, etc., and achieve accurate detection results. , The effect of simple debugging and saving labor costs

Inactive Publication Date: 2014-01-15
TONGJI UNIV
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Problems solved by technology

Due to the harsh construction environment of dynamic compaction, the normal operation of the visual sensor or laser sensor cannot be guaranteed under the conditions of strong vibration, high temperat

Method used

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  • Dynamic compaction machine construction real-time monitoring method and system based on pounder impact acceleration measurement
  • Dynamic compaction machine construction real-time monitoring method and system based on pounder impact acceleration measurement
  • Dynamic compaction machine construction real-time monitoring method and system based on pounder impact acceleration measurement

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Embodiment Construction

[0034] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0035] 1. The design idea is the principle of the present invention:

[0036] Before tamping, the soil at the tamping point is soft, the impact time of the ram hammer on the ground is long, the ground cushioning effect is good, and the peak acceleration is small. During tamping, a hard shell is gradually formed below the rammed pit from top to bottom, and the yield stress of the upper layer of soil is close to or greater than the additional stress of the impact load of dynamic tamping. The dynamic response of the upper layer of soil is mainly elastic, and most of the ramming energy is consumed in A small part of the compaction of the soil is consumed by the elastic vibration and damping vibration of the soil. As the number of tamping strikes increases, the hard shell layer whose dynamic response is mainly elastic in the soil gradually expands...

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Abstract

The invention relates to a dynamic compaction machine construction real-time monitoring method and system based on pounder impact acceleration measurement. An acceleration sensor in the system, a detection controller, a data memory, a signal transmitter and a portable power source are fixedly installed on a pounder, the acceleration sensor provides collected voltage signals for the detection controller, and analog signals are processed through the detection controller and transmitted out through the signal transmitter. A signal receiver in the system, a receiving controller and a display and warning device are installed in a cab, the receiving controller receives maximum peak acceleration data provided by the signal receiver, and the receiving controller performs incremental computation on pounding point maximum peak acceleration for every time and judges whether the pounding is finished. According to the dynamic compaction machine construction real-time monitoring method and system, pounder impact on the ground is directly detected, the punning degree of soil mass is judged according to the stress conditions of the soil mass, judging results of the punning degree are directly obtained essentially, and detection results are accurate and reliable.

Description

technical field [0001] The invention relates to the field of mechanical engineering and automation thereof, in particular to a method for automatically monitoring the construction operation of a dynamic compaction machine by collecting the impact acceleration of the soil on a rammer during the dynamic compaction operation. Background technique [0002] The dynamic compaction method, also known as the dynamic consolidation method (Dynamic Consolidation), is a reinforcement method for dealing with weak soil foundations. It was developed and created by French engineer Louis in the late 1960s. It uses lifting equipment to raise the rammer (8 ~ 40t) to a large height (10 ~ 40m), and then makes the rammer fall freely, and acts on the foundation with a large impact energy (500 ~ 8000KN·m). A large shock wave is generated in the ground to overcome various resistances between soil particles and compact the foundation, thereby improving the strength of the foundation, reducing settle...

Claims

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Application Information

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IPC IPC(8): E02D3/046E02D1/00
Inventor 李万莉顾明浩刘鹏
Owner TONGJI UNIV
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