Construction of leachate collection and drainage system

1. Construction of leachate collection and drainage system

【Formula】Pipe drain

The construction of leachate collection guide system mainly includes the construction process of guide layer paving, collection flower pipe connection, collection canal stacking and other construction processes.

2. Transportation and distribution of pebble pellets

【Formula】Repeat the number of shop sweeps

Pebble pellets are transported using small tonnage (load less than 5t) dump trucks to transport pebble pellets directly to the paved membrane. According to the width of the working face, calculate the number of unloading vehicles of each section in advance, and discharge according to the calculated quantity to avoid over-unloading or less unloading.

On the impermeable layer of the material transport vehicle's travel route, no less than two layers of geotextile of the same specification are paved to strengthen the protection of the impermeable layer. When the material truck is driving on the impermeable layer, it travels slowly, and must not stop or start urgently; Sharp turns are strictly prohibited; The driver should obey the command staff.

Before the material truck enters and exits the impermeable layer, the pebbles splashed on the impermeable layer in the direction of the vehicle are cleaned by a special person, so as to avoid the wheels crushing the pebbles and damaging the impermeable layer.

3. HDPE leachate collects five stages of hot melt connection of flower tubes

【Formula】Pre-absorption is cold

HDPE leachate collection flower tube connection is generally hot-melt welded. The hot-melt welding connection is generally divided into five stages: preheating stage, endothermic stage, hot plate removal stage, docking stage, and cooling stage.

4. Flower tube hot melt process

【Formula】Cut the hot melt and butt cold

Cutting the end of the pipe: Use the fixture to accurately snap the pipe to the welding machine, wipe the end of the pipe, align, and mill the end of the pipe with a milling cutter until continuous chips appear.

Alignment inspection: After taking out the milling cutter, close the welding machine, and require that the gap between the end faces of the pipe is not more than 1mm, and the dislocation of the pipe edges of the two pipes is not more than 10% of the wall thickness.

Turn on the power supply: make the heating plate to 210±10°C, wipe the surface of the heating plate with a clean cotton cloth, and load it into the welding machine.

Heating and melting: close the two pipe ends, so that the welding machine heats the pipe end under a certain pressure, when there is a 0.4~3mm high melting ring, that is, stop pressurization, and carry out pressure-free heat preservation, the duration is 10 times of the wall thickness (mm).

Pressurized docking: After reaching the holding time, open the welding machine, carefully take out the heating plate, and re-close the welding machine within 10s, and gradually pressurize the weld ring to make the height of the melting ring reach 0.3~0.4 times of the wall thickness. The thickness of the unilateral side reaches 0.35~0.45 times of the wall thickness.

Packing cooling: Generally, the cooling time is 20~30min.

5. Key points of construction control of leachate collection and drainage system

【Formula】People walk the car material pipe

(1) When filling the pebbles of the guide layer, it is advisable to use a dump truck less than 5t, adopt different driving routes, advance in a circle, pile up materials at an interval of 5m, avoid overturning the substrate, and lay the filter material (pebbles) with the film and the guide layer.

(2) The filter material of the guide row layer needs to be screened, and the particle size should meet the design requirements. Pebbles should be preferentially used as drainage materials in the guide and row layer, gravel can be used, the particle size of the stone should be 20~60mm, and the CaCO3 content of the stone must be less than 5% to prevent the calcification of the guide row layer from causing the landfill leakage.

(3) The diameter of HDPE pipe: the main pipe should not be less than 250mm, and the branch pipe should not be less than 200mm. The opening ratio of HDPE pipe should ensure the strength requirements. The arrangement of HDPE pipes should be in a straight line, its turning angle should be less than or equal to 20°, and its joints should not be sealed.

(4) The dirt on the connecting surface of the pipe or pipe fittings should be wiped with a clean cotton cloth, and the connecting surface should be milled to make it perpendicular to the axis and make it consistent with the corresponding section.

(5) Before the hot-melt butt connection of the guide pipe, the two pipe sections should each extend out of the clamp for a certain free length, and the two corresponding connectors should be straightened so that they are on the same axis, and the wrong edge should not be greater than 10% of the wall thickness.

(6) The pressure holding and cooling time of the hot-melt connection shall comply with the regulations of the hot-melt connection tool manufacturer and the pipe fittings and pipe production plant, and ensure that the connector shall not be moved or external force shall be applied to the connector during the cooling period.

(7) Set the walking route of workers to prevent repeated stepping on HDPE geomembrane.

6. Safety and environmental monitoring

【Formula】The displacement of the body fluid of the dam mountain, the water vapor noise is dense.

(1) The stability and safety of the landfill garbage dump, garbage dam and surrounding mountain slope should be monitored, including the leachate level in the dump, the displacement of the dump, the displacement of the garbage dam, and the displacement of the surrounding mountain slope.

(2) Groundwater, surface water, atmosphere, discharged sewage, site boundary noise, and fly density should be regularly monitored around the landfill.

Yesterday口诀7/5

1. HDPE film material quality acceptance and perception inspection

【Formula】Thick and wide appearance label information

2. HDPE film material quality sampling inspection

【Formula】Draw batch 3 volume 1

3. HDPE film laying engineering construction quality perception inspection

【Formula】The seam is flat and dense

4. Sampling inspection of construction quality of HDPE film laying project

【Formula】Fill in the welding inspection

Three days ago mantra 7/3

1. HDPE film storage

【Formula】Dry yin and clear, far away from heat and stored for 2 years

2. HDPE film construction procedures

【Formula】Hanging paving inspection, adjustment and welding testing

3. HDPE film laying regulations

【Formula】Check the level and prevent drainage, and the wind shop leaves a wide welding car supervisor

4. Key points of HDPE film laying construction:

【Formula】Prepare the soil case in the surface, check the anchor wrinkle pliers, sign the driving and prohibit exemption

Seven days agomantra 6/29

1. Preparation for the construction of the comprehensive pipe gallery project

【Formula】Drawings are investigated and selected materials

2. Construction technology of cast-in-situ reinforced concrete structure comprehensive pipe gallery

【Formula】Acceptance of mold base mixing joints

3. Construction technology of prefabricated reinforced concrete structure comprehensive pipe gallery

【Formula】Pile making, marking, inspection, hoisting, and transporting

4. Foundation pit backfilling

【Formula】The structure is waterproof, evenly filled in the side, and the top rice is forbidden to be milled

5. Maintenance of comprehensive pipe gallery

【Formula】Special day with maintenance evaluation, water and fire people are limited

6. Comprehensive pipe gallery management data

【Formula】Filing and maintenance of daily life

Two weeks agomantra 6/22

1. Basic provisions of the project

【Formula】Docking net distance covering ditch protection

2. Regulations on gas pipelines crossing buildings:

【Formula】Jianda ignition and explosion corrosion, casing vertical penetration, deep diameter sealing distance erosion

3. The use of roads and bridges for gas pipelines to cross rivers should meet the requirements

【Formula】Pressure transmission thickness measurement of pile distance, compensation of vibration and bending angle security and anti-corrosion

五周前口诀6/2

1. The necessary conditions before the full water test of the structure

【Formula】Before and after the strong Qing repair, the floating stable charge and row are sealed, and the instruments and equipment are particularly safe

2. Preparation for full water test

【Formula】Water source injection and cover hole mark, ruler needle steaming observation and measurement

3. The test process of full water in the pool

【Formula】Prepare to inject water and view steaming

4. Water injection in the pond

【Formula】3 times 2m/d isolation measurement value, when the settlement is special

5. Observation of the water level of the full water test pool

【Formula】The needle is read at the beginning and the end, and the character is connected twice.

6. Determination of evaporation capacity of pool full water test

【Formula】No cover test at the same time

7. Pool full water test standard

【Formula】Wet area at the bottom of the wall, 23 notes of steel-concrete masonry.

Eight weeks ago mantra 5/4

1. Foundation pit engineering, support and enclosure structure

Cantilever single multi-support, external anchor reduction control

2. Foundation pit enclosure structure system

The wall encloses the inheritance, and the pit is deep in the environment

3. Type of deep foundation pit enclosure structure

The ground is connected to the gravity wall, and the piles are dug and filled

4. Precast concrete sheet piles

The moment T port connection is permanent

5. Advantages and disadvantages of steel sheet piles and steel pipe piles

Strong isolation and application of normal, deep lock fault structure anchor support, sinking and pulling water-stopping corner pile

6. Bored pile enclosure structure

Beam diameter mixer spacing

7、SMW工法桩（型钢水泥土搅拌墙）

The pile diameter is H steel, and the plugging and unplugging mud is strong

8. SMW construction pile process

Groove machine, recycling after stirring

9. Gravity cement-soil retaining wall

Convert deep embedded stiffeners

10. Types and advantages of underground diaphragm walls

The large and small sound of steel concrete is pre-produced, and it is suitable for multiple soil layers

11. The underground diaphragm wall is grooved

Dedicated segment length, planar shape

12. Underground diaphragm wall process

The guide trough is cleaned and hung and poured

13. A flexible joint of the groove section of the underground diaphragm wall

Circular wave wedge mixing

14. The channel section of the underground diaphragm wall is a rigid joint

Perforated steel plate socket ribs

15. The role of the guide wall

Heavy mud retaining base to supplement the resistance

16. Performance requirements for guide walls

Strong and precise construction

17. Factors should be considered when determining the form of the guide wall

Influence of ground water charge

18. The main technical performance indicators of mud

PH value, dense clay sand

三月前口诀4/7

1. Bridge composition

The lower branch is attached

2. Structures included in the substructure

Pier foundation

3. Bridge ancillary facilities

The face seam is sloped

4. The bridge deck system includes:

The water fence is clear

5. Common terms related to bridges

The arrow spans high, and the long line is hole

6. The classification of bridges

Force across the use of materials to obstruct the parking space

7. Bridges are divided according to the characteristics of stress

Beam arch rigid suspension group

8. Divided according to the span of the bridge

1138 or 15425

9. Bridges are divided according to their use

Highway and railway farmers transport water

10. Bridges are divided according to the materials used in the main load-bearing structures

Wood and steel mixing

11. Bridges are divided according to the nature of the obstacles they cross

Riverline viaduct

12. The bridge is divided according to the position of the carriageway of the superstructure

Upper, middle and lower bearing