zhangxiaosan
Legenda soseske
Pridružen/-a: 27.09. 2016, 06:54
Prispevkov: 1069
|
 Objavljeno: 10 Nov 2016 07:15 Naslov sporočila: Paving test section |
 |
|
This chapter mainly includes: the purpose of the test, the preparation of the test, the content of the test (the number of test items, the number of tests, the frequency of testing), the test process, the test results and so on.
The test objectives are as follows:
Confirm the use of the impact roller model is appropriate;
Impact rolling can achieve the desired effect;
To determine the appropriate impact rolling the construction process;
Determine the appropriate quality testing methods;
Determine the reasonable quality control standards;
Test items include: thickness, settlement, compaction, physical and mechanical parameters of soil, penetration value (DN), broken conditions, deflection, flatness,
Soil vibration velocity measurement, bearing capacity and other indicators, according to the different uses of impact roller to determine the corresponding test items and frequency.
Construction preparation
This chapter mainly includes some basic preparatory work that should be done before impact roller compaction.
New road impact rolling
Impact crushing of new roads mainly includes: ground and road impact rolling, earth and rock mixed fill, filling stone embankment layered stamping, roadbed impact to enhance pressure and so on.
Ground and road impact roller compaction for the following situations:
The general section of the Il level (including II level) below the collapsible loess foundation;
Shallow soft foundation with thickness less than 3m;
Soft soil cutting.
The above situation is mainly based on the impact of impact roller depth (1.4m or so) and the effective compaction thickness (1.1m or so) and highway engineering requirements of the foundation treatment.
Impact crushing is mainly used in soil and stone mixed fill, fill the stone embankment layered stamping. For fine-grained soil due to loose shop coefficient is too large, stamping surface ups and downs and the speed does not increase. Therefore, fine grained soil should not be stratified stamping. In the summary of a number of engineering examples, based on the appropriate thickness of the stamping stamping and punching times are clearly defined.
Enhanced pressure is mainly applied to the following situations:
To fill 4m above the roadbed to enhance the layering pressure:
Impact rolling at the junction of excavation and excavation;
The vibration rolling has reached the top of the road under the impact of rolling.
Tested by the test section, stamping 20 times after the average settlement if less than 30mm. It is not necessary to carry out the impact of enhanced pressure, for the impact of the road rolling crush requirements are designed to dig 10cm in the dug after the surface to facilitate the formation of loose surface and filling the filling. The optimum reinforcement pressure position of the road bed is 100mm under the designed bed height. Subgrade layer pressure, each layer thickness is generally 2.Om ~ 2.5m, fine-grained soil embankment take a small, coarse-grained soil embankment take a large value. The roadbed will not be widened when the pressure is increased.
road maintenance equipment sold worldwide
kind of road maintenance rammer
gray cardboard grooving machine
double steel wheel roller manufacturer |
|
