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Super-detailed underground waterproofing project construction practices that engineers must know

Author: admin Published: 2019/5/7 Hits: QR code sharing
First, the construction of self-waterproof concrete structure
1. The material of waterproof concrete and the proportion of cement should be selected according to design requirements, and its strength level should not be lower than 32.5. The natural aggregate of the coarse aggregate is suitable, the particle size should be 5 ~ 40mm, and the mud content should not be greater than 1%. Requirements for the proportion of waterproof concrete: the impermeability required for the trial mix is 0.2 MPa higher than the design value; the amount of cement is not less than 300kg / m3, and the active admixture is not less than 280kg / m3; ~ 45%, water-cement ratio is not greater than 0.55; slump should not be greater than 50mm.
2 construction points
模板 The formwork of waterproof concrete project should be smooth and the joints should be tight and leak-proof. Generally, it is not suitable to use bolts or iron wires to penetrate the concrete wall to fix the formwork. When bolts are used to penetrate the concrete wall to fix the formwork, water stopping measures should be taken. Such as the use of tool-type bolts, welded in the middle of the bolt water-proof steel plate, bolts at both ends of the block and so on.
① Tool bolt method: Fix and tighten the waterproof bolt with the tool bolt. When removing the mold, remove the tool bolt, and then close the bolt groove tightly with caulking material and polymer cement mortar.
② Bolt plugging method: Make grooves around the bolts on both sides of the structure, cut off the bottom of the flat groove of the bolt after removing the mold, and then block the groove with expanded cement mortar.
③ The method of adding a welded water stop ring to the embedded casing: add a casing to the pull bolt, the casing can also serve as a head support, and two ends of the casing should be provided with studs. After removing the mold, the bolts are pulled out, and the casing is sealed and compacted with expanded cement mortar. The pits left by the cushion are sealed in the same way.

⑵ In order to prevent the water introduction of steel bars, the steel bar protection layer on the water front must not be less than 50mm, the steel bars on the floor must not contact the concrete cushion, and the steel bars cannot be fixed on the formwork with iron nails or lead wires. Water infiltrated along the reinforcement.

西安防水工程

⑶ There is no bleeding or segregation before the waterproof concrete is poured, and the free fall height is not more than 1.5m.
机械 Waterproof concrete should be mechanically vibrated and compacted.
⑸ Every 500m3 of continuous pouring concrete, one group (6) of impervious test pieces shall be kept, and each project shall be not less than 2 groups.
⑹ Waterproof concrete should be cured naturally, and the curing time should be no less than 14 days.
3 Waterproof structure treatment
缝 Construction joint
The construction joint is a weak part of waterproofing, so it should not be left or left in construction. The floor concrete shall be continuously poured, and vertical construction joints shall not be left on the wall. The horizontal construction joint of the wall should not be left at the place where the shear force and bending moment are large or where the floor and the wall meet. The low-level construction joint should be no less than 200mm from the floor surface and no less than 300mm from the edge of the hole through the wall.
处理 Through-wall pipe treatment
Water supply and drainage, heating, and cable ducts should pass through the underground outdoor wall, and they should be waterproofed. Otherwise, water seepage will easily occur along the root of the pipe. In order to ensure the waterproof construction and easy installation of the pipeline, the location of the pipeline should be 25cm away from the corner or protruding part of the inner wall, and the distance between the pipes should be greater than 30cm. Directly buried type is suitable for wall penetrating pipes with a diameter of <5cm: sleeve type is suitable for wall penetrating with a diameter of> 5cm: wall penetrating box type is suitable for multiple wall penetrating pipes. When concentrated: no impact or vibration shall be caused when concrete is poured. Buried through the wall pipe, when the soil is backfilled outside the wall, it is not allowed to punch or tamp the through wall pipe protruding outside the wall, so as to avoid water leakage due to the impact of the waterproof measures.
⑶ Embedded parts
The embedded iron parts on the wall or floor of the basement are fixed with hangers or special tools to prevent water from seeping into the room along the iron parts. The embedded iron parts are subject to large forces. In order to prevent disturbing the surrounding concrete and damage the waterproof layer, the thickness of the end of the embedded parts to the outer surface of the wall must not be less than 25cm, and it should be partially thickened if it is less than 25cm.
⑷The deformed seam waterstop is currently used mostly embedded rubber (plastic) waterstop.
(1) The waterproof layer of the post-casting belt and the post-casting belt is not disconnected. An additional layer is added and the water-proofing tape is attached outside, which can partially thicken the bottom plate and set up a water-proofing tape. Since the thickening of the bottom plate generally does not exceed 25cm, it is not suitable to set a buried water stop, and an external type water stop should be used.
Construction of rigid waterproof layer of waterproof mortar
Rigid waterproof layer is suitable for waterproof layer of underground masonry structure or reinforced layer of waterproof concrete structure. Its ability to resist deformation is poor, and it should not be used when the structure is subject to more severe vibration loads or is subject to corrosion, high temperature and repeated freezing and thawing.
1 Primary treatment
The treatment of the base layer of the rigid waterproof layer is very important. The treatment of the base layer includes cleaning, watering, brushing, and leveling to keep the surface of the base layer moist, clean, flat, solid, and rough. Edges and irregularities exceeding 1cm should be cut into slow slopes, washed with water, and leveled with plain ash and cement mortar. Treatment of unevenness on the concrete base layer: Picture 47.jpg The honeycomb holes on the concrete surface should be removed from loose stones and cleaned by watering. The plain gray and cement mortar should be used to level the base layer. Treatment of honeycomb holes in concrete base: Picture 48.jpg For lime masonry or cement mixed mortar masonry, the joint should be cut to a depth of 1 cm, and the joint should be at a right angle. Brickwork picking: Picture 49.jpg Concrete construction joints should be cut into a figure-eight groove along the joint. After rinsing with water, the plain ash is used as a base and the cement mortar is compacted and leveled.

The cement mortar waterproof layer is made by cross-layering with pure cement mortar and cement mortar. The number of times the waterproof layer is applied is determined by the design. The more common method is 5 times. The first layer of plain gray layer, 2mm thick, first wipe a 1mm thick cement slurry, scrape back and forth with an iron trowel, the cement slurry fills the pores on the surface of the base layer, and then wipe a 1mm thick cement slurry to level the layer. Brush on the surface of the cement paste in order. The second cement mortar layer has a thickness of 6 to 8 mm. It is performed after the initial setting of the cement mortar layer, and it is desirable that the cement mortar is thinly embedded in 1/4 of the thickness of the cement mortar layer. The above layers alternate. The construction joints of the waterproof layer need sloped stepped stubble, and the overlap of the stubble is overlapped layer by layer according to the hierarchical operation sequence. The location of the stubble is generally left on the ground, and the stubble must be 20cm away from the yin and yang angle. The waterproof layer of the yin and yang corners needs to be rounded. The diameter of the yin corner is 5 cm and the diameter of the yin corner is 1 cm.

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Construction of flexible waterproof layer
The flexible waterproof layer uses a coil waterproof layer. Currently, high-polymer modified asphalt waterproof coils and synthetic high-molecular waterproof coils are used in waterproofing projects of underground projects. The disadvantage of the flexible waterproof layer is that it is more difficult to repair after leakage. The method of paving the waterproof layer of the coil is divided into external and external methods and external and internal methods according to the sequence of construction with the underground waterproof structure. Exterior wall exterior surface.
Construction procedure: pouring cushion layer → laying permanent protective wall → laying temporary protection wall with 300mm height → painting cement mortar screeding layer on the wall → applying additional waterproof layer at the corner Structural mortar cement screed leveling layer → facade waterproof layer construction → acceptance and protection layer construction.
The external and internal protection method is to lay up the permanent protective wall after pouring the concrete cushion, and lay the coil on the cushion and the permanent protection wall.
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