Quality Requirements for Pervious Base and Gravel Base
I. Quality Requirements for Pervious Base
The quality requirements of the water-permeable base layer are as follows.
Appearance
a. The surface is flat, solid, tightly caulked, and there is no loose surface;
b. Rolling with 12t steel roller, the depth of wheel trace must not exceed 5mm;
c. There is no soft-slurry section.
2. The allowable deviations are shown in Table 1.
Permeable base quality tolerance table 1
project | Allowable deviation | Testing |
Smoothness | 10mm, no more than 5% | With 3m ruler with feeler gauge per 100m2 |
thickness | ±10% | Every 500m2 point, using a ruler |
width | Not less than design requirements | Use a ruler, one for every 50m |
Cross slope | less than 1% | Level meter measuring 50m |
Longitudinal slope | Less than 1/1000 | Measuring with a water meter, measuring every 100m |
compactness | ≥93% | 2 per game |
Note: The standard mass density can be measured using Marshall Stabilizer or 30 MPa (300 kg/cm2) pressure forming method.
II. Quality requirements for gravel substrate
After the permeable gravel substrate has been roller compacted, the surface should be solid and smooth, and the caulking material must not float on the surface or accumulate to form a layer. After being rolled by a roller over 12t, the wheel track shall not be larger than 5mm, and the quality of the gravel bottom substrate See Table 2 for requirements.
Quality requirements for gravel substrate
project | Quality or tolerance | Test frequency | Testing method | |
range | Points | |||
Compaction density | ≥2.1t/m3 | 1000m2 | 1 | Sand filling method |
thickness | ±10% | 1000m2 | 1 | Use steel ruler |
Smoothness | ≤10mm | 300m2 | 1 | 3m ruler and feeler gauge |
Elevation | ±10% | 300m2 | 1 | The amount of water meter |
UY hydraulic cylinder for metallurgical equipment. This product is the standard product of heavy machinery enterprises, and the standard number is. JB / zq4180-1997.
Technical characteristics
Reliable work, impact resistance, pollution resistance, suitable for high temperature, high pressure, harsh environment
Impact-resistant hydraulic cylinder
Anti-pollution hydraulic cylinder
Hydraulic cylinder for metallurgical equipment
Application field
Smelting, casting and rolling, transportation, transportation, power and other equipment.
Type
Size(mm)
Class
Max. Flow
Nominal Flow
Transitional Flow
Min. Flow
Min. Reading
Max. Reading
m³/h
L/h
m³
LXSGZ-15E
LXSGZR-15E
15
B
3.125
2.5
50
31.25
0.00005
99999
40
25
32
20
25
15.62
LXSGZ-20E
LXSGZR-20E
20
B
5
4
80
50
64
40
51.2
32
40
25
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