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MHT6107-2014: (Covers of water catchments and wells of civil airport flight area)
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(Covers of water catchments and wells of civil airport flight area)
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MH/T 6107-2014
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Standard similar to MHT6107-2014 MH/T 6108 MH/T 6106 MH/T 6098 Basic data | Standard ID | MH/T 6107-2014 (MH/T6107-2014) | | Description (Translated English) | (Covers of water catchments and wells of civil airport flight area) | | Sector / Industry | Civil Aviation Industry Standard (Recommended) | | Word Count Estimation | 18,158 | | Date of Issue | 23/7/2014 | | Date of Implementation | 1/10/2014 | | Issuing agency(ies) | Civil Aviation Administration of China | MHT6107-2014: (Covers of water catchments and wells of civil airport flight area)---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Gully tops and manhole tops for aerodromes
ICS 49.100
V 50
Civil Aviation Industry Standard of the People's Republic of China
Covers of water catchments and wells of civil airport flight area
014-07-23 release
2014-10-01 implementation
Issued by Civil Aviation Administration of China
Table of contents
Foreword...II
1 Scope...1
2 Normative references...1
3 Terms and definitions...1
4 Level...5
5 Materials...5
6 Design requirements...6
7 Test...11
8 Logo...16
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by the Airport Department of the Civil Aviation Administration of China.
This standard was approved by the Aircraft Airworthiness Certification Department of the Civil Aviation Administration of China.
This standard is under the jurisdiction of the China Academy of Civil Aviation Science and Technology.
Drafting organization of this standard. Airport Department of Civil Aviation Administration of China.
Drafters of this standard. Gao Tian. MH
Covers of water catchments and wells of civil airport flight area
1 Scope
This standard specifies the definitions, grades, materials, design requirements, test requirements,
Sign.
This standard is applicable to the top cover of the water collection port and the top cover of the well with the clear aperture below 1,000 mm (inclusive) set in the flight area of a civil airport.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article
Pieces. For undated references, the latest version (including all amendments) applies to this document.
GB/T 700 carbon structural steel
GB/T 1173 Cast aluminum alloy
GB/T 1348 Ductile iron castings
GB/T 1499 Steel for reinforced concrete
GB/T 6414 Casting dimensional tolerance and machining allowance
GB/T 9439 Gray iron castings
GB/T 11352 Cast carbon steel parts for general engineering
GB/T 13912 Technical requirements and test methods for hot-dip galvanizing of steel parts with metal covering
GB/T 15115 die-cast aluminum alloy
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Gully
A set of components for receiving surface water into the drainage system.
3.2
Manhole
A chamber or shaft leading to an underground facility.
3.3
Gully top
A part of the water collection port is located on the top of the water collection port box and consists of a seat ring and a grates or cover plate.
3.4
Manhole top
A part of the underground well, located on the top of the underground well, is composed of a seat ring and a cover plate or grates.
3.5
Seat frame
The fixed part of the top cover of the water collection port or the top cover of the well is used to place and support the grate and the cover.
3.6
Grating
The movable part of the top cover of the water collection port or the top cover of the well allows water to pass through and reach the water collection ditch.
3.7
Cover
The movable part of the top cover of the water collection port or the top cover of the underground well is used to cover the wellhead.
3.8
Vent
An opening in the cover plate of the well roof for ventilation.
3.9
Dirt bucket
The movable part of the water collection port or the top cover of the water collection port to collect garbage.
3.10
Dirt pan
The movable part of the underground well or the roof of the underground well, used to collect garbage.
3.11
Seating
The surface on which the grate or cover is placed on the seat.
3.12
Depth of insertion
The vertical height of the top cover of the water collection port and the side of the top cover of the underground well and the seat ring can play the role of positioning and restraint, as shown in Figure 1.
3.13
Total clearance
The sum of the maximum gaps between the seat ring and the grate and the cover plate are shown in Figure 2.
2a) 2b) 2c)
3.14
Clear opening (CO) clear opening
The diameter of the inscribed circle of the net area of the seat ring is shown in Figure 3 and Figure 4.
Note. The unit of clear aperture is millimeter (mm).
3.15
Clear area
The area of the unobstructed part between the bases is shown in the shaded part in Figure 5.
Note. The unit of net area is square meter (m2).
Figure 5 Schematic diagram of net area
3.16
Mass per unit area
The total mass of the cover or grates divided by the net area.
Note. The unit of mass per unit area is kilogram per square meter (kg/m2).
3.17
Cushioning insert
A material on the seat ring, grate or cover, so that the grate or cover does not swing when placed.
3.18
Test load
The load applied to the top cover of the water collection port or the top cover of the well during the test.
3.19
Pedestrian area
Exclusively for passengers and apron operators, and only temporarily allow motor vehicles to pass through during cargo delivery, cleaning and maintenance or emergency situations
area.
4 rank
The top cover of the water collection port and the top cover of the underground well are divided into 6 grades according to the carrying capacity. A15, B125, C250, D400, E600 and F900.
Each level is generally applicable to the following areas, if in doubt, a higher level should be selected.
a) A15-only allow pedestrians and bicycles to pass through the area;
b) B125-sidewalks, pedestrian areas and similar areas, general-purpose vehicle parking lots or parking spaces;
c) C250--the area where drainage canals are arranged beside the lane of the flight area, the soil area of the flight area;
d) D400--the area of the flight area, which carries general tire-loaded aircraft and operating vehicles;
e) E600-the area of the flight area that carries aircraft and operating vehicles with larger tire loads;
f) F900-the active area of the flight area is the area carrying the aircraft with a particularly large tire load.
5 materials
5.1 General requirements
5.1.1 Underground well roof and water collection cover
Except for the grates, the top cover of the well and the top cover of the water collection port should be made of the following materials.
a) Flake graphite cast iron;
b) Nodular cast iron;
c) Cast steel;
d) Rolled steel;
e) A combination of any one of the materials from a) to d) and concrete;
f) Reinforced concrete;
g) Aluminum alloy.
The rolled steel should have sufficient corrosion resistance, and the corrosion resistance of the rolled steel can be improved by hot-dip galvanizing on the clean surface. Galvanized thickness should
Not less than the value given in Table 1.The thickness of the rolled steel should not be less than 2.75 mm (as specified in 6.7 for the edge of the well roof and the seat ring connection
Except for the protective layer of the contact surface).
5.1.2 Grate
The grates should be made of the following materials.
a) Flake graphite cast iron;
b) Nodular cast iron;
c) Cast steel.
5.1.3 Filling material of cover plate
The filling material of the cover plate can be concrete or other filling materials suitable for the installation site.
5.2 Production, quality and testing
The production, quality and testing of designated materials shall comply with the relevant content of the following standards.
a) Flake graphite cast iron shall comply with GB/T 9439;
b) Nodular cast iron should comply with GB/T 1348;
c) Rolled steel should comply with GB/T 700;
d) Cast steel should comply with GB/T 11352;
e) Hot-dip galvanizing should comply with GB/T 13912;
f) Cast iron tolerances should comply with GB/T 6414;
g) Rebar should conform to GB/T 1499;
h) Cast aluminum alloy should comply with GB/T 1173;
i) Die-cast aluminum alloy should comply with GB/T 15115.
For concrete used for the top cover of B125 to F900, at 28 d, the minimum compressive strength of a cube test block with a side length of 150 mm should reach
The minimum compressive strength of 45 N/mm², a cylindrical test block with a diameter of 150 mm and a height of 300 mm should reach 40 N/mm²; it is used for A15 wells
For the concrete of the top cover, the minimum compressive strength of the above test block should reach 25 N/mm².
When a reinforced concrete structure is adopted, the thickness of the concrete covering on each side of the top cover should not be less than 20 mm. Reinforced concrete reinforced structural cloth
The bureau and detailed design should meet its performance requirements. This concrete covering thickness requirement does not apply to rolled steel, cast steel, flake graphite cast iron or ball
The black cast iron is the top cover of the well of the chassis.
6 Design requirements
6.1 Appearance
The top cover of the water collection port and the top cover of the well shall not have defects that impair its applicability.
6.2 Ventilation holes of the top cover of the well
6.2.1 The top cover of the well may be provided with ventilation holes. The top cover of the well with ventilation holes can be provided with a dirt pan.
6.2.2 The minimum ventilation area of the well roof with ventilation holes shall meet the requirements of Table 2.
6.2.3 The size of the ventilation holes on the roof of the well shall meet the following conditions.
a) When the vent hole on the roof of the well is a long hole, the length of the vent hole shall not exceed 170 mm; the width of the vent hole on the roof of the A15 and B125
It should be 18 mm～25 mm. C250, D400, E600 and F900 underground well roof cover vents have a width of 18 mm～32 mm;
b) When the vent holes in the roof of the well are round holes, the diameter of the vent holes in the roof of the A15 and B125 wells is 18 mm～38 mm. C250, D400,
The diameter of the ventilation holes in the roof cover of E600 and F900 wells is 30 mm～38 mm.
6.3 The clear aperture of the roof of the well for personnel entry
The design of the opening on the top cover of the underground well for personnel to pass through should be able to effectively meet the safety requirements of the installation area, and its diameter should usually be no less than
600 mm.
6.4 Embedding depth
The embedding depth of the D400, E600 and F900 water collection top cover and the well top cover should not be less than 50 mm. If the cover or grates pass the lock
The positioning device can be firmly positioned and will not be displaced due to vehicle traffic, so there is no need to meet this requirement.
6.5 Total clearance
6.5.1 The gap between different parts of the top cover of the water collection port and the top cover of the well shall be calculated according to 3.13.
6.5.2 The clearance may cause horizontal displacement of the cover or grates on the seat ring. To limit this displacement, the total clearance should meet the following requirements.
a) For covers or grates with one or two parts.
1) When the clear aperture is not more than 400 mm, the total gap should not be more than 7 mm;
2) When the clear aperture is greater than 400 mm, the total gap should not be greater than 9 mm;
b) For cover plates or grates with three or more components, the total gap should not be greater than 15 mm, and the gap between the components should not be greater than
5 mm.
6.6 Base
The top cover of the water collection port and the top cover of the well shall be made to ensure that they are matched with the base. D400, E600 and F900 grade bases should adopt opposite contact surface
Processing, adding shock-absorbing pads, adopting three-point support design or other methods to ensure stability and quietness in use.
6.7 Protection of the edges and contact surfaces of the roof of reinforced concrete wells
The edges of the A15, B125, C250 and D400 grade reinforced concrete well roof and the contact surface between the seat ring and the cover shall be made of graphite casting
Iron, nodular cast iron or hot-dip galvanized steel should be protected. The minimum thickness of cast iron or steel should meet the requirements of Table 3.
6.8 The stability of the cover and the grates in the seat
The cover and the grates should be kept stable in the seat ring to adapt to the traffic conditions in each installation area described in Chapter 4.The following schemes can be used.
a) Equipped with a set of locking devices;
b) Have sufficient quality per unit area;
c) Have a special design.
The above design schemes should ensure that the cover or grates can be opened with universal tools.
6.9 Slot size
6.9.1 Slot distribution and permeable area
The design of the slots on the grates should consider the requirements of drainage capacity and should be evenly distributed on the net area. The permeable area should not be less than the net area
30%, and the manufacturer should explain this in the manual.
6.9.2 Straight slotted hole
6.9.2.1 A15 and B125 grade grates
The slot size of A15 and B125 grade grates should meet the requirements of Table 4.
6.9.3 Non-straight slotted hole
The non-straight slotted hole shall be designed so that it cannot pass the 170 mm×170 mm×20 mm gauge.
6.10 Dirt pan and dirt bucket
When using the dirt pan and hopper, make sure that the dirt pan or hopper can continue to drain and ventilate after it is full.
6.11 Positioning of cover and grates
The design should ensure that the cover or grate has a set position relative to the seat ring.
6.12 Surface condition
6.12.1 The upper surface of the cover plate, grates and seat ring of D400, E600 and F900 grades should be flat, and the height deviation should not be more than 1% of the clear aperture.
And the maximum should not be greater than 6 mm. D400 grade cover or grates installed in parking areas can be concave.
6.12.2 The upper surface of the new solid cast iron and cast steel well roof shall have a raised pattern.
The height of the raised pattern should be.
6.13 Loosening and opening of cover and grates
Corresponding measures should be taken to ensure that the cover and grates can be effectively loosened and opened.
6.14 Sealed underground well roof
For well roof covers with sealing performance requirements, the sealing design depends on the pressure under the cover, as well as odor sealing and gas tightness.
Specific requirements such as sealing or water pressure sealing.
6.15 Bearing surface of seat ring
The contact surface between the seat ring and the supporting structure shall meet the following requirements.
a) The supporting pressure under the test load does not exceed 7.5 N/mm²;
b) Ensure sufficient stability under working conditions.
6.16 Seat ring depth
The overall depth of the D400, E600 and F900 level wells or the top cover seat ring of the catchment shall not be less than 100 mm; when one of the following conditions is met,
The depth of the metal part of the D400 level well or the top cover seat ring of the catchment can be reduced to 75 mm.
a) The seat ring is poured into concrete with a strength of at least C50 to bond the seat ring and the concrete together;
b) The seat ring is fixed by an anchoring device.
6.17 Opening angle of hinged cover and grates
6.17.1 Unless otherwise specified, the opening angle of hinged covers and grates should not be less than 100 º relative to the ground plane.
6.17.2 The cross-sectional shape of the cover plate and the hinged part of the grate in the radial direction of the hinged shaft should ensure that the gap between the cover plate and the grate and the seat ring cannot be used.
The 170 mm×170 mm×20 mm gauge passes, see Figure 7.When the gauge is placed vertically against the curved edge of the cover and the grate, it is at 170 mm
6.18 Recessed cover (filled cover)
For recessed cover plates, unless the filling work is carried out in the factory, the manufacturer shall provide all procedures for the filling operation. Filled
The surface texture of the cover plate should be suitable for its installation location.
7 Test
7.1 Basic requirements
7.1.1 The top cover of the water collection port and the top cover of the well shall be tested as a whole according to the requirements of the environment in which it is used. If the recessed cover is delivered in an unfilled state,
The load test should be carried out without filling.
7.1.2 All grades of products specified in Chapter 4 shall be subjected to load test.
7.1.3 For certain requirements, when no specific verification method is given in this standard, the manufacturer shall give the test method in its product documentation.
7.2 Test load
See Table 6 for the test loads of the top cover of the water collection and the top cover of the well with a clear aperture greater than or equal to 250 mm.
The test load of the top cover of the water collection and the top cover of the well with a clear aperture less than 250 mm is the value shown in Table 6 multiplied by the ratio of the clear aperture to 250
(CO/250), but the minimum should not be less than 0.6 times the value shown in Table 6.
7.3 Test device
7.3.1 Test machine
7.3.1.1 For the A15, B125, C250 and D400 grades of the top cover of the water collection and the top cover of the well, the test machine (preferably hydraulic test machine)
The loading capacity should be greater than 25% of the corresponding test load. For E600 and F900 grades of water collection cover and underground well roof, it should be greater than the corresponding test load.
10% of the test load.
7.3.1.2 The maximum allowable error of the test load is ±3%.
7.3.1.3 Regardless of the condition of the conjoined specimen, the size of the test bench of the testing machine shall be larger than the supporting area of the single specimen.
7.3.1.4 Rigid spacer
See Table 7 for the size and shape of the rigid pad.
7.3.2 Test preparation
Place the rigid cushion block on the test piece (cover or grate), and its longitudinal axis should be perpendicular to the surface of the test piece and coincide with the geometric center of the test piece. Correct
For double-triangular cover plates or grates, rigid pads should be placed on their geometric centers, see Figure 8.Normally, the cover or grates should be placed on the seat ring
in.
Figure 8 Rigid spacer and geometric center
The test load should be evenly distributed across the surface of the rigid pad. If the surface of the cover or grates is not flat, it should be
An intermediate cushion layer of cork, fiberboard, felt or other similar materials is added between, and the size of the intermediate cushion layer should not be larger than the size of the rigid cushion block.
A similar intermediate cushion layer can also be added between the test bench surface and the supporting surface of the testing machine.
When testing the non-planar surface of the top cover of the water collection port and the top cover of the well, the contact surface of the rigid pad should be made to match the cover or the grate
Matching shape. Surfaces made in accordance with the provisions of 6.12 and surfaces that are not much different from the plane do not require the contact surface of the rigid pad to be made corresponding
shape.
7.3.3 Type test
7.3.3.1 Type test should take three test samples to test to prove that they meet the relevant requirements. Each sample should meet Chapter 5 and Chapter 5
Technical requirements specified in Chapter 6.
7.3.3.2 The type test shall be carried out when the product design undergoes structural changes. All design changes, whether structural or non-
If it is structural, it should be approved by the certification body.
7.4 Test procedure
7.4.1 Basic requirements
All cover plates or grates shall be subjected to permanent deformation determination test and load test.
7.4.2 Permanent deformation determination test
Before loading, write down the initial reading of the geometric center of the cover or grate.
The test sample is loaded to 2/3 of the test load at a rate of 1 kN/s ~ 5 kN/s, and then unloaded. Repeat this process 5 times, then write down
The final reading of the geometric center of the sample.
The difference between the initial reading and the final reading after 5 loads is the amount of permanent deformation. The permanent deformation should not be greater than the value listed in Table 8.
The measured value of permanent deformation should be accurate to 0.1 mm.
For the double-triangular cover or grates, the permanent deformation of the two parts should be measured, and the measurement position should be as close as possible to the geometric center, as shown in Figure 8.
For test samples of reinforced concrete structures, after the test, feeler gauges or other appropriate methods are used to measure the cracks in the concrete.
The width of the crack should not be greater than 0.2 mm.
7.4.3 Load test
After the permanent deformation test is completed, the test load shall be immediately loaded to the test load at the same loading rate as the test and maintained for 300 2 s. In the test,
Parts made of the various materials mentioned in Chapter 5 a), b), c), d), e) and g) should not have cracks. Cover for reinforced concrete
For the slab, the adhesion between the steel bar and the concrete should not be lost after the loading test.
7.5 Test method
7.5.1 Appearance
Check visually to determine whether there are defects.
7.5.2 Ventilation holes
Measure the size of the vent hole with a measuring tool to the nearest 1 mm, and calculate its area to the nearest 100 mm2.
7.5.3 Clear aperture
Measure the clear aperture (circular, rectangular, triangular) with a measuring tool to the nearest 1 mm.
7.5.4 Embedding depth
Measure the embedding depth (A) of the D400, E600 and F900 grades of the top cover and the well top cover, accurate to 1 mm.
7.5.5 Total clearance
Use a measuring tool to measure the gap between the cover plate or grate and the seat ring to the nearest 0.5 mm, and calculate the total gap.
7.5.6 Base
The compatibility index of the base to ensure that the cover or the grate is stable in the seat ring shall be tested to meet the manufacturer's technical specifications.
7.5.7 Edge protection
The gauge measures the thickness of the uncoated steel (iron) protective edging on the roof of the reinforced concrete well to the nearest 0.1 mm. Hot dip galvanized layer
The thickness is accurate to 5 μm.
7.5.8 The stability of the cover or grates in the seat
If the stability is achieved through the method of "sufficient mass per unit area", the mass value of the cover or grates should be accurate to 1%, and the net area should be accurate.
It is 100 mm².
If the stability is achieved by a locking device or other specially designed methods, the relevant device should be visually inspected; if necessary, it should be
Line measurement.
7.5.9 Dimensions of the slot
Visually check whether the slots on the net area of the grates are evenly distributed; measure the slot size with a gauge to the nearest 1 mm; calculate the permeable area,
Accurate to 100 mm2.
7.5.9.1 Straight slotted hole
The measuring tool measures the size of the straight slot hole to the nearest 1 mm.
7.5.9.2 Non-straight slotted hole
The size of the non-straight slot should be measured with a 170 mm×170 mm×20 mm gauge.
7.5.10 Dirt pan and dirt bucket
Fill the dirt pan and hopper with sand, and visually check whether the dirt pan and hopper still have drainage and ventilation capabilities.
7.5.11 Positioning indication
When permanent marks or marks are used to ensure the positioning of the cover or grates in the seat ring, the marks or marks shall be visually inspected.
7.5.12 Surface condition
Measuring flatness with a measuring tool, accurate to 0.5 mm. The height of the raised pattern should be measured accurately to 0.5 mm. Visual inspection with reference to drawings,
Determine the surface area of the raised pattern of the cover and seat, or measure the size of the upper surface of the raised pattern with a measuring tool, accurate to 1 mm, and calculate the raised portion
The surface area of the sub-pattern accounts for the percentage of the upper surface of the top cover.
7.5.13 Loosening and opening of cover and grates
The loosening and opening device of the cover or grates shall be tested for operation.
7.5.14 Tightness of ground well top cover
For the well top cover with sealing performance, the corresponding test plan should be developed according to the sealing performance given by the manufacturer for experiment. As Jiangdi
The well body is placed in a certain depth of water for a certain period of time, and then whether there is leakage in the part of the well cover; or the inside of the well body is filled with gas of a certain pressure
Body, and then determine whether the pressure drop exceeds a certain limit value in a certain period of time.
7.5.15 Seat ring support surface
The bearing surface pressure under the test load is o...
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