2.3.6 Link Measurement, view and analyse data
2.3.6 连接测量（Link Measurement）、查看和分析数据
After downloading the measurement data, a measurements needs to be linked to an active project. Select the option Link Measurement in the SIT menu. Any open project will be closed.
在测量数据下载后，测量需要连接到一个活动的项目。在SIT菜单中选择Link Measurement 选项，此时每个打开的项目会被关闭。
Select the check box of a measurement and choose the project, then press the link button. The memo field in the dialog box will show the latest status. 选择一个测量的检查对话框并选择项目，然后点击连接按钮。 对话框的记忆区会显示最近的状态。
Press OK to link the measurement(s). 点击OK连接测量。
You can now open the desired project for further reporting and analysis. The linked measurement(s) are shown in the project tree.
现在，你可以打开所需的项目以便进一步报告和分析。连接的测量显示在项目树中。
Remarks: 备注：
? ? ?
If you decide not to link a measurement after downloading, you will be alerted every time you run
the SIT-software.
如果你决定不在下载后连接测量，每次运行SIT软件时，都会提示你连接。
Please use the Refresh button in the Report Signals Tab to update recent changes in settings and parameters.
请使用Report Signals 选项卡下的Refresh按钮更新最近的设置和参数的更改。
?
3 Sonic Integrity Testing in general 3 声波完整性测试简介
Sonic Integrity Testing is a widely used measurement method to check the integrity of foundation piles, directly after installation. Sonic Integrity Testing is based upon the principle of sending a low strain shock wave from the pile head through the pile shaft and registration and interpretation of the response. 声波完整性测试是一个被广泛使用的用于桩基安装完成后直接检查桩基的完整性测量方法。声波完整性测试的原理为：从桩头开始发生一个小的应力冲击波穿透桩身，然后记录并分析它的响应。
3.1 Aim of Sonic Integrity Testing 3.1 声波完整性测试的目的
The aim of analysing SIT measurements is to quantify the size of possible defects or irregularities that have arisen in the pile shaft during installation or driving. Measurements indicate whether or not foundation piles will be capable of passing on the load on the pile head to the bearing layers.
分析SIT测量的目的是确定桩身在安装或操作过程中引起的可能缺陷或不规则的尺寸。测量可以显示桩基是否可以将荷载从桩头传递到支撑层上。
Sonic Integrity Testing is performed directly after installation or driving and before the foundation is
incorporated in a further foundation plan, in order to prevents construction delay, considerable costs and liability issues later on in the construction project.
为了防止后续的建筑工程中的建筑延期、损失以及责任问题，声波完整性测试在桩基安装完成后直接进行，并且在地基纳入进一步地基计划之前进行。
Please note: Sonic Integrity Testing does not provide any indications of the load bearing capacity of the pile foundations, but only provides information on the conditions of concrete piles it selves (see paragraph 3.4). 请注意：声波完整性测试并不能提供桩基的荷载承受能力的信息，只能提供混凝土桩基本身状况的信息。 3.2 Basics of Sonic Integrity Testing 3.2 声波完整性测试的基本原理
? Firmly press a SIT acceleration sensor on the pile head and strike the pile head with a SIT-hammer. ??将SIT加速度传感器紧紧地按在桩头上，然后使用SIT撞锤敲击桩头。
? A low strain shock wave is inserted into the pile head travelling through the pile shaft to the pile toe and
back upwards. ? 一个小的应力冲击波插入到桩头中，透过桩身传输到桩脚，然后反向传回。
? The response from the pile to the shock wave, is registered by the acceleration sensor and shown as a
reflectogram on screen of the SIT ? 桩基对冲击波的响应被加速度传感器记录并在SIT屏幕显示反射图。
The Integrity Testing (SIT) principle can be explained from the impact of a spring-mass system in 2 different cases. First, the case is that the last mass can move freely (Free End). The second case is that the last mass is restricted (Fixed End). In both cases, the energy of the impact mass is transferred from the first mass, then to the next, and so on down the line.
声波完整性测试（SIT）可以通过质量弹簧系统的冲击的两种情况解释：第一种情况是最终质量可以自由移动（Free End）；第二种情况是最终质量有约束（Fixed End）。在两种情况下，冲击质量的能量从第一个质量、下一个质量…往下传输。
Thus, by observing the impact mass alone, one can determine a Free End or Fixed End condition, even if the end is not visible as with piles after boring or driving.
这样，仅通过观察冲击质量，可以确定Free End 或 Fixed End 状况，即使桩基末端在开凿或敲击后不可见。
Illustration 3.2 A: Basics of Sonic Integrity Testing, illustrated by a spring-mass system
图解3.2A:用弹簧质量系统解析基本声波完整性测试
Comparably, testing piles by Sonic Integrity Testing one can distinguish a Free End from a Fixed End condition for a pile in soil after driving or boring, by implementing Sonic Integrity Testing. A hammer impact sets the first mass/ pile head in motion. A pile has both elastic properties and mass, as modelled with a series off balls connected by springs. Thus, the spring under the top ball compresses, transferring energy to the next ball. The top ball now has zero velocity, while the energy is transferred from the pile head down the pile shaft, to the pile toe.
相应地，使用声波完整性测试方法测试桩基，可以将开凿或敲击进土壤中的桩基的Free End状况从Fixed End状况区分开来。撞锤冲击使第一个质量/桩头变为运动状态。通过弹簧连接一系列的悬空球，桩基既有弹性特性又有质量特性。顶部的球现在的速度为0，而它的能量从桩头往下通过桩身传输到桩脚。
Illustration 3.2 B: Sonic Integrity Testing on foundation piles with free and fixed pile end 图解3.2B: 无末端和有固定末端的桩基完整性测试
3.2.1 Pile Discontinuities 3.2.1 桩基不连续性
One of the main purpose of Sonic Integrity Testing, is to provide an indication of pile discontinuities.
The hammer blow generates a wave travelling down the pile and as well as a reflective wave which travels up from the pile toe. Defects and other discontinuities such as an inclusion, hole, or crack are reflected in the same direction as the hammer blow. A bulge or increase in cross section is reflected in the opposite direction. Thus, in the reflective wave showed after SIT testing, one can reveal discontinuities after
installation or after driving. Some discontinuities cannot be detected by SIT testing, as table 3.2.1 describes. Please be aware: insufficient blow length and incorrect (too high) filter and/or gain settings can also be the cause of non-detected discontinuities.
桩基完整性测试的一个主要目的是提高桩基的不完整性信息。撞锤冲击产生一个冲击波，往下传输到桩脚，同样反射波从桩脚网上传输。缺陷或其他诸如夹杂物、孔、裂缝会反映在撞锤敲击的相同方向上。横截面中的突起或增大反映在相反方向。这样，在SIT测试后显示的反射波中，可以显示桩基安装或敲打后的不连续性。如表3.2.1描述的，有些不连续性不能被SIT测试检测到。
请注意：不充足的敲击时间长度和不正确（太高）的过滤和增益设置也可能是检测不到不连续性的原因。
Table 3.2.1: Detectable versus Non-detectable discontinuities 表3.2.1 不连续性不可检测和检测不到
相关推荐：
loading