How long should the embedded PVC drainage pipe be embedded in the masonry retaining wall

Whether the drainage treatment of the retaining wall is proper or not directly affects the safety and use effect of the retaining wall. Therefore, drainage facilities should be provided on the retaining wall to drain the water in the slope material behind the wall, prevent the water accumulation behind the wall caused by surface water infiltration, so that the wall body is protected from additional hydrostatic pressure; Eliminate the swelling pressure caused by the increase of water content of cohesive soil filler; Reduces the frost heave pressure of packing in seasonally frozen areas.

The drainage facilities of the retaining wall are usually composed of two parts: ground drainage and wall drainage.

Ground drainage ditches can be set up to drain ground water; Compacting the top surface of the backfill and the ground loosening soil to prevent rainwater and ground water infiltration, and paving can be added if necessary; The gutter in front of the toe of the trench retaining wall should be paved and reinforced to prevent the gutter water from seeping into the foundation.

The main purpose of wall drainage is to quickly remove the water behind the wall. The mortar retaining wall should be at the appropriate height of the wall according to the amount of seepage water.

Arrange the drain holes. The size of the drain hole can be used according to the size of the discharge water respectively, using 5cm 10cm, 10cm 10cm, 15cm 20cm square hole, or 5 10cm diameter round hole. The spacing of the drain holes is generally 2 3m, and the upper and lower staggered settings.

The bottom of the lowest drain hole should be higher than the ground in front of the toe of the wall; When it is a cutting wall, the water outlet should be higher than the water level of the side ditch: if it is a flooded retaining wall, it should be higher than the normal water level to avoid the backflow of water outside the wall. In order to prevent water from seeping into the foundation, a 30 cm thick clay aquifer should be installed at the bottom of the bottom of the drainage hole.

Coarse-grained material reversal should be set at the inlet of the drain hole.

filter layer to avoid clogging the pores. When the back of the wall filling is not permeable or there is the possibility of frost heave, the sand and pebble drainage layer with a thickness of not less than that should be set between the lowest drainage hole behind the wall and the top of the wall or geotextile should be used.

Wall drainage is mainly to remove water behind the wall, usually at the appropriate height of the wall to arrange a row or several drainage holes.

The size of the drain hole can be seen by the size of the discharge volume, and the square hole or the diameter of the hole is used.

The spacing of the holes is generally 2 3 m, which can be increased in arid areas and decreased in rainy areas. For water-soaked retaining walls, the holes should be staggered up and down, left and right. The outlet of the lowest drain hole should be higher than the ground; If it is a trench retaining wall, it should be higher than the water level of the side ditch; The flooded retaining wall should be above the normal water level.

The shoulder wall or embankment wall is set below the high fill embankment or steep slope embankment, which can prevent the subgrade slope or base from sliding, ensure the stability of the subgrade, and at the same time shrink the foot of the fill slope, reduce the amount of fill, reduce the demolition and floor space, and protect the existing buildings adjacent to the line.

For riverside and reservoir embankments, a retaining wall is set on the waterfront side to prevent the erosion and erosion of the roadbed by the water flow, and it is also an effective measure to reduce the compression of the riverbed or occupy less storage capacity.

The spacing of the drainage pipes is determined according to the hydrogeological conditions, mainly considering the two factors of surface water and groundwater, and of course you have to combine the detailed parameters of the retaining wall.

Reserve the tube according to a certain spacing.

According to the "Technical Code for Building Slope", there are detailed regulations on it.

You're talking about PVC electrician pipes, model 16-50mm

Medium wall thickness 16 20 25 32 mm 40

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The length of the shear wall, whether flexible or rigid, is consistent with the thickness of the shear wall due to the limitation of the formwork. The length of the rear wall casing should be about 2mm higher than the wall, and both ends are.

The embedded casing is reserved for the pipe to pass through the brick wall, concrete beam, concrete wall and other components. It is suitable for civil air defense, underground engineering, chemical industry, steel, tap water, sewage treatment and other places where pipelines pass through the wall and require strict waterproofing. Generally, the diameter of the embedded casing is two specifications larger than the diameter of the pipe to pass through the component.

1. Wall, 1) The length of the shear wall, whether it is flexible or rigid, is limited by the formwork, and its length is consistent with the thickness of the shear wall.

2) The length of the rear wall casing should be about 2mm higher than the wall, and both ends are there. In this way, the wall will be flat with the wall after whitewashing.

2. a plate surface; 1) The bottom of the casing for water supply and drainage in the kitchen and bathroom is flush with the top plate, and the height of the panel should be at least 5mm higher than the finished ground.

2) The casing in the electric well and water well should also be 5mm higher than the finished ground.

3) The elevation of the plane can be based on the civil engineering drawings.

Directly refer to the "Code for Construction Quality Acceptance of Building Water Supply, Drainage and Heating Engineering" GB 50242-2002 which has more detailed requirements.

This is a plastic drainage pipe with an organized drainage of the back fill of the retaining wall through the wall. There is no strict limit on the length of the inner and outer leaves. 30mm and 50mm are fine. However, 1. The pipe diameter of 50 is too small; 2. The height of the right nozzle leaving the clay aquifer should be marked, too small and easy to block.

Generally, the steel pipe is larger than the installation pipe, such as the 2-inch PVC pipe with DN65 or DN80 casing, to ensure that the gap between the working pipe and the casing is about 10mm. The corresponding pipe coarse gap should be larger, and the casing should be larger if the error is large. The riser is 40-50mm longer on the ground as needed, and the lower end is flush with the roof.

Install horizontally at both ends flush with the wall.

First of all, you need to look at the water supply and drainage design description: whether there is a requirement to bury the steel casing through the floor and the wall, if the internal design drawings do not require the capacity of the steel casing, the PVC casing can be buried: the casing of PVC160 is embedded in the pipe of the floor slab, the inner wall and the indoor floor beam DN100 (equivalent to PVC110), and the casing of each floor slab is generally removed before the concrete is completely hardened, that is, the hole is left first (in order to facilitate the casing, the PVC casing is generally broken first when embedded);

The ground beams that penetrate the outer wall, roof and outer wall of the basement must be embedded with a rigid waterproof casing, that is, a steel pipe + a waterstop foil ring; If it is a ring beam buried casing on the outer wall of the bathroom, the pipe of DN100 is buried with a rigid waterproof casing of DN150.

There are many types of types of bushings, which can be divided into three types of pure porcelain bushings: single insulating material casing, composite insulating casing (including oil-filled casing, inflatable casing) and capacitive casing (including oil-paper capacitive casing, adhesive paper capacitive casing) according to the structural characteristics and different main insulating mediums.

Due to its relatively simple structure, it is widely used for wall bushings of 35kV and below and electrical bushings of 10kv and below. In order to ensure sufficient creepage distance, the outdoor part of the porcelain sleeve is also provided with ribs. In order to prevent corona in the air inside the porcelain sleeve, the surface of the porcelain sleeve is often sprayed with a metal coating and the diameter of the guide rod is enlarged to improve the electric field distribution.

1. First of all, you have to look at the water supply and drainage design instructions: whether there is a requirement to bury the steel casing through the floor and the wall, if the design drawings do not require the steel casing, the PVC casing can be buried: the casing of PVC160 is embedded in the pipe of the floor slab, the inner wall and the indoor floor beam DN100 (equivalent to PVC110), and the casing of each floor slab is generally removed before the concrete is completely hardened, that is, the hole is left first (in order to facilitate the casing, the PVC casing is generally broken first when embedded);

The ground beams that penetrate the outer wall, roof and outer wall of the basement must be embedded with a rigid waterproof casing, that is, a steel pipe + a waterstop foil ring; If it is the ring beam of the outer wall of the bathroom buried casing, the pipe of DN100 is buried in the rigid waterproof casing of DN150, but now the bathroom is sewage and wastewater diversion, and there is a caisson and a secondary seepage pipe, (this is basically the design of our southern side, depending on how you design it on the drawing), so that the ring beam of the bathroom through the outer wall needs to be buried with three casings, pay attention to the consistent size spacing of each layer, otherwise when the external wall is installed in the future, the branch pipe is uneven, What an ugly word is that (the same applies to the air-conditioning casing embedded in the shear wall of the exterior wall, and the air-conditioning casing is generally PVC casing).

The other is that the bathroom is not designed with caissons, and the rigid waterproof casing should be left in the outer wall ring beam, and the floor of each layer of the bathroom should be left with a hole (that is, the bathroom supervisor and branch pipe of this house are on the roof of the next one, but now it is basically eliminated, and the maintenance is too difficult), and then add the casing when installing the branch pipe in the future, and the PVC casing can be done without explanation.

2. The brand of the material depends on whether there are clear provisions or requirements on the contract and the construction unit, if not, before each material enters the site in large quantities, you can ask the construction unit to send the sample first, and choose a brand after being determined by the supervision and Party A; The brand you said, this is not easy to say, the brand of the material has a certain regionality, our side of PVC pipe: Liansu, Xiongsu, Huasu used more, in your side may not be applicable. You can go to a nearby hardware store to consult, commonly used material brands, the higher the price of the general brand awareness.

Generally, the casing of the wall and floor slab is two pipe diameters larger than the water pipe to be worn: the casing of DE32 embedded DN40D; DN32 embedded DN50 casing. Now the casing is mostly made of steel casing (that is, welded pipe).

If you wear the outer wall of the basement, you must reserve a waterproof casing.

Hello, I don't know about this either, I'm sorry about the specifics.