The key points of waterproof construction in construction engineering are fully understood to ensure the engineering quality!


Building waterproof engineering is a divisional project to prevent the structure of buildings (structures) from being invaded by water and the internal space from being harmed by water

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Building waterproof engineering involves basement, wall body, wall floor, roof and many other parts of buildings (structures)

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Its function is to prevent water leakage and groundwater erosion within the design durability period of buildings (structures), and ensure that the building structure and internal space are not damaged

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Basement waterproof 1, mix proportion and materials (1) concrete composition materials

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According to the requirements of the project, the test mix proportion shall be prepared

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Before the construction, the commercial mixing station shall test mix, check the slump, adjust the water consumption, and determine the construction mix proportion

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After the determination, it shall not be adjusted at will

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(2) Gravel shall be selected for waterproof concrete, with mud content no more than 1%, mud content no more than 0.5% and crushing index no more than 12; medium coarse sand shall be selected, with average particle size no more than 0.5mm, mud content no more than 3% and mud content no more than 1%

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2

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Pumping waterproof concrete (1) reasonably arrange the position of pump truck according to the needs of the project to reduce the turnover times

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(2) The length ratio of horizontal conveying pipe to vertical conveying pipe is not more than 1 ∶ 3

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The pipeline connection shall be straight and the turning shall be straight and slow

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The pump pipe joint shall be tight to prevent the pipe from being blocked by air in the pipe during construction

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(3) Before pouring concrete, the pipe shall be washed with pressurized water, and then the cement mortar shall be pressed

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(4) Iron bars are placed at the feed port of the delivery pump to prevent large sundries from mixing into the concrete mixture

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(5) The slump shall be managed and measured by a specially assigned person, and the slump value shall be adjusted in time and recorded in detail

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3

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Formwork construction (1) the formwork shall be flat, the joint shall be tight, and there shall be sufficient strength and rigidity

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It shall be wet before pouring concrete

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(2) The water stop ring is welded on the split bolt to fix the formwork

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After removing the formwork, cut off the bolts along the edge of the concrete structure, brush the anti embroidery paint, and smooth with waterproof mortar

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4

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When the concrete curing concrete enters the final setting, it shall be covered with double-layer grass curtain with color strip cloth and watered

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The curing time shall not be less than 14 days

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After the basement exterior wall formwork is removed, the exterior wall waterproof construction is carried out, the foundation pit is backfilled in time, and the concrete is concealed

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The concrete standard curing room and box are set up on site to strictly control the concrete curing environment

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Exterior wall waterproof 1

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Cleaning of base course

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The surface of base course paved with waterproof layer shall be clean, flat, solid and dry without hollowing, sanding and cracking

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All pipes and bolts passing through the wall shall be well treated before the construction of waterproof layer

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2

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Brush the base treatment agent

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Brush the base treatment agent on the clean base

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The thickness should be uniform

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Small area or internal and external corners and other parts that are not easy to roll brush should be carefully brushed with a brush dipped in the base treatment agent

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There should be no pitting, missing brush and other defects

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3

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Lay additional layer

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The weak parts of basement floor, such as sump, elevator shaft, pipe root and deformation joint, shall be laid with the same additional layer as coiled material

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The contact part between the roll material from the bottom to the facade and the permanent protective wall should be laid empty, and the additional layer should also be laid empty

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4

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Lay coiled materials lay coiled materials in large area on the base surface of the base treatment agent which has been dried, snap the datum line, and bond with the hot-melt method; bake the bottom surface of coiled materials and the base surface with the spray gun to melt the asphalt on the bottom surface of coiled materials, roll the coiled materials forward while baking, and then roll them with the roller to extrude the air between the coiled materials and the base, so as to make them bond firmly with the base

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Toilet, kitchen waterproof 1, base surface treatment, base surface must be flat, clean, firm, no water, no leakage, internal and external corners should be made into arc angle

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In order to ensure the coating thickness and construction quality, the process should be completed in the order of bottom coat → lower coat → middle coat → upper coat

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2

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After the construction of waterproof layer in wet rooms such as closed water test toilet and water tank room is completed, there is no leakage after 24 hours of water storage, and then the surface layer or decoration shall be done

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After the decoration, the secondary water storage test shall be carried out

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If there is no leakage after 24 hours, it can be accepted

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3

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Waterproof film (1) should be used in strict accordance with the specifications and with the use, the day used up

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In the process of preparation and construction, the container of rubber material should be covered in time to prevent water evaporation and conjunctive or dry solid

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(2) Wear flat shoes during construction operation, and avoid placing construction machines and tools on the waterproof layer that is not yet dry

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(3) there shall be no wrinkles, bubbles, white stubble, edge warping and other phenomena

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(4) When the coating is applied, it shall be evenly stirred at any time, as far as possible, without local deposition; when the brushing construction is adopted, the direction of each brushing is perpendicular to the previous one; the time interval between each layer shall be subject to the previous one, which is dry and solid, but must be continuously applied

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4

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Construction points (1) according to the slope of the ground, the thickness of the ground, the location of the datum line, determine the top elevation of the floor drain and water outlet

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Before waterproofing, all vertical pipes shall be constructed and the hole shall be tightly blocked with fine aggregate concrete

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(2) When making the leveling layer, the corner arc should not be too large, otherwise it will affect the wall decoration

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A small groove with 1cm width should be left around the pipe root casing, floor drain and water outlet

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After the leveling layer is dry, it should be filled with ointment

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(3) After the completion of the waterproof layer, the water test must be carried out, and the water storage time is more than 24 hours

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The next process can be carried out only after the water is qualified, and the water storage test record shall be made

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Roof waterproof 1

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Base treatment: clean the protrusions and other foreign matters on the surface of the base

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The modified asphalt adhesive is diluted with industrial gasoline, stirred evenly, coated on the base with a long handle roller brush, and the coiled material is laid after 4 hours at room temperature

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2

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In the construction of additional layer, parapet, downcomer, pipe root, cornice, internal and external corners and other details shall be added first

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Generally, modified asphalt coiled material shall be used for construction, which shall be firmly adhered

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3

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For cornice, the carcass material paved on the cornice end is cut and pressed into the groove, and then the groove is filled with sealing material

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4

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The gutter, eaves gutter and gutter shall be sealed before painting

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When the downcomer cup is buried, the joint between the downcomer cup and the socket of the vertical pipe shall be tightly filled with sealing materials to prevent water pouring in case of rainstorm

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Due to the large amount of water flow in the gutter and cornice, it is often washed and soaked by rain, so the corner of the gutter and cornice should be coated with sealing material first, and then a layer of coiled material should be laid as an additional layer after drying

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5

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Before the construction of the flashing and coil end flashing parts, the coil should be paved first, and the length of the matrix material in the vertical plane should be sufficient

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The plane should be paved to the corner first, and then the facade should be paved from the bottom to the top

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6

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There should be no reverse tenon in the direction of water flow for the paving at the intersection of vent and roof outlet pipe, additional layer should be pasted at the internal corner of vent, and the upper shear should be crossed and pasted

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Cement mortar is used to build six edge waterproof foot protection at the root of the pipe to ensure that the shearing position is not cracked or damaged

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7

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The waterproof layer at the internal and external corners of the roof is easy to be cracked

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Therefore, within the range of 100 mm from each side of the base course of the internal and external corners of the roof, the waterproof layer shall be coated with sealing materials, and then the additional layer shall be paved

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*Note: some of the contents and pictures are transferred from the Internet

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If there is any infringement, please contact us to delete them in time | edited by: Wang Zhe Yang Baomin | checked by: Peng Liyun | edited by: Wang Zhe Yang Baomin click on the pattern to open the wechat applet

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