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1·This paper introduces a digital instrument for vertality of pile hammer. In the instrument AT89C51 is the key chip . The structure of instrument, s hardware and software are analysed.

介绍一种以单片机AT89C51为核心的垂直度测量仪，分析了硬件组成及主要软件工作流程。

2·Hydraulic pile hammer is one of the pile driving machines that drive prefabricated piles into the ground in the construction of pile foundation such as construction, bridge, dock, etc.

液压打桩锤是用于建筑、桥梁、码头等桩基础施工中打入预制桩的桩工机械。

3·Mechanical impact dynamics is used to analyse the production and spread of stress wave when hydraulic pile hammer hammerblows piles, the stress wave influence the course of driving pile.

本文应用冲击机械系统动力学分析打桩过程中锤体与桩撞击时应力波的产生、传播以及该波对沉桩过程的影响。

4·Small , ultra-small models can play Piles of automatic hammer , highway , rail barrier pile , Impact also can be used to consolidate all types of roads and infrastructure .

小型、超小型号的自动打桩锤可以打护坡桩、公路铁路护栏桩、还可以用其冲击破路和夯实各类基础。

5·The experience of pile hole drilling using pneumatic hammer in bridge construction is reviewed. Equipments, tools and techniques are also described in detail.

文中回顾了在建桥工程中，应用风动潜孔锤钻进桥桩桩孔的经验，具体介绍了使用的设备、工具及施工工艺技术。

6·The basic principle of simple high strain pile test method transformed from measured free fall of drop hammer is given in this paper.

给出测量自由落锤的加速度换算高应变试桩的动力的简易法的基本原理、测试操作与工程应用。

7·The weight that drops in a pile driver or steam hammer.

撞键打舂机或汽棰内落下的重物。

8·By the construction example of garbage extruding pile impacted and rammed by a heavy hammer, the method is analyzed and some Suggestions are put forward.

本文通过重锤冲孔夯扩垃圾挤密桩处理软弱地基工程实例介绍，对此方法进行了分析，并提出了改进意见。

9·The drivability study of piling requires modeling of the hammer impact to calculate the input force wave at the pile head.

桩的可打性研究需要模拟桩的锤击，计算出桩顶的应力波。

10·The hammer weight of High Strain Testing determines on that the pile capacity tested by High Strain Testing is correct or not.

高应变测试时锤重的选择，直接影响高应变承载力测试的成功与失败。