Basement waterproofing for the seminar

[Abstract] long-term project in the basement surrounded by water, and water sources and composition is extremely complex, often contain many harmful media, so the purpose of waterproofing the basement includes not only the seepage, but also include the maintenance of the structure of protection, this Construction on the basement waterproofing concrete measures were discussed.

[Keywords] basement waterproofing, construction technology

After pouring a basement wall treatment
Qi Hao in the back before filling 370 mm thick walls and put away after pouring cover. To prevent bad crowd backfill retaining wall, the skin should be every three cracks in the gray brick through a long pull then placed 2Φ8 steel. Yin and yang, retaining walls and cover the application of cement mortar into the angular diameter of 50 ~ 80 mm small fillet, to prevent damage to SBS waterproofing membrane.

2 deformation crack at the water treatment measures
Deformation should be added an additional layer of membrane, an additional layer of total width of 600 mm. Deformation in two sides should be pouring concrete in construction, the water stop in the middle sandwiched Deformation client mode on the same asphalt wood wool board nailed to the side die and the water stop the wing edges reinforced with wire fixed to the floor, and then pouring concrete, the concrete strength reaches a certain strength to be removed after the end of the template, with the wire side of the water stop to another fixed-wing steel on the floor, and then pouring the other side of the concrete. wood wool board-side sealed filling ointment strict.

Construction Requirements: construction, to ensure a solid and concrete with water-stop, in addition to the water-cement ratio and cement content of concrete must be strictly controlled, the exposure should not be a water stop for concrete coarse aggregate concentration or leakage vibration phenomenon in the support template-based and water stop pouring concrete shall not be destroyed.

Concrete should be vibrated at the water stop, out of the bubble, but the vibrator insertion point should be left more than 250 mm water-stop, non-vibrating contact with water stop rod for heat pipes through the concrete wall, can be used to waterproof rubber sealing sleeve to accommodate the pipe due to temperature rise caused by the shrinkage deformation, ie, the first flange of the sealing sleeve embedded in the structure, not in the blue end of the casing pipe weeks tick along the chisel, with prime gray inlay fill Install pipes, the sealing rubber condom into the wall and install the casing pipe flange, bolts tight hoop, and then iron pipes card will only hoop fastening rubber wall pipe in the skin, then not end with the asphalt blue flax and other wall pipe casing and fill the gap between the embedded dense, and finally with water repellent admixture to the cement mortar tube tightly closed fractional root four weeks.

Additional layer at the pipe must be carefully pasted to ensure construction quality. Is to press the detailed shape of the coil well cut, not heating, posted about in detail, depending on size, shape, suitable, and then roll the bottom (with heat flux side) with a hand-held torch baking, leaving the molten state can be pasted at the end of the sealing material has been painted a grass-roots, the prison shop and compaction.

After pouring in the basement structure after construction, can be carried out basement dewatering well the closed wells should be closed before the garbage, mud and other debris to clean up; dewatering well pipe outer wall of the rust with a wire brush cleaned; removed the excess part of the steel, the steel infusion C30S6 micro-expansion concrete, then flange, bolts, rubber gasket sealed pipe. precipitation of secondary wells should be pouring concrete strength grade than the areas where the basement floor level to improve the expansion of concrete, and old and new Concrete should be chiseled face access Cha Mao Houqing clean and fully wet.

3 waterproof concrete works
3.1 Construction Process
3.1.1 Process
Ready mix concrete mixing → Construction → Maintenance → Transportation → casting
3.1.2 Concrete mixing: in strict accordance with the ratio of construction, accurate weighing the amount of each material, feeding order: gravel, cement, fly ash, admixtures, sand, water, water after stirring 3 minutes, to ensure that the concrete mixing time. cement, sand, stone, additives and other materials, truck weighing, 160-200 mm slump.

Determination of the construction process, regular testing of concrete slump, construction or other reasons, such as rain, sand water content changes, and timely determination of its moisture content and adjust the concrete mixing water.

3.1.3 Concrete transport continuous equilibrium, at intervals of not more than 2 hours. Concrete during transport to prevent the phenomenon of segregation and slump loss, leakage of plasma carts prohibited shipment of concrete, if segregation occurs, before pouring a second mixing.

3.1.4 Concrete pouring continuous casting, leaving less left construction joints due to the orchestra pit area 3 floors underground, in order to ensure the normal adjacent concrete floor construction shall be H ~ J, 21 ~ 22 to stay facilities, industrial sewing shaft section (see next Figure ensure the construction of assembly-line, leaving in the same construction joints after pouring.

3.1.5 floor basement waterproofing, impermeability of the concrete retaining wall poured to Deformation, construction joints, and after pouring into the construction zone for concrete pouring. Floor, side walls is designed to impermeability of concrete, on-site pouring concrete mixing station, ensure continuous construction, leaving no cold joints. the construction of a first-poured concrete floor, concrete floor partitions to high by the end of the construction is completed, the side wall casting, continuous pouring of concrete construction programs. concrete floor "of the word" to the casting, the side wall layer of concrete pouring cycle.

Template should be removed before pouring the debris, water, steel surfaces should be clean and free of grease. Check embedded parts, aside hole, pipe, sealing tape, identify problems in time. Pouring concrete free-fall height of not more than 2 m to prevent the accumulation of gravel produced, affecting the quality. Links to free download http://www.hi138.com
Concrete floor construction: concrete floor construction a "second vibrator, many wiping pressure" construction process, ensure confidentiality and impermeability of concrete from grade. Layered side wall of concrete pouring cycle, the two teams and groups at the same time, the concrete layer thickness 400mm, adjacent two-story concrete pouring at intervals of not more than 2 hours, to insert the lower concrete vibrator, 50 mm is appropriate. Retaining wall reinforcement, template, concrete construction should be to meet the design strength of concrete floor when more than 40%. reinforced concrete vibrator non-collision, templates, embedded parts, etc. pouring process in a timely observation of the template, steel, embedded parts, and set aside hole situation, identify problems and take timely measures to deal with.

Before pouring concrete on construction joints, concrete surface should be cutting hair, removing debris, to keep a layer of clean wet holes 20-30mm thick 1:1 cement mortar, and then layered casting, application of mechanical vibration, to ensure dense concrete, not excessive vibration or leakage vibration.

3.1.6 base floor, side walls of concrete vibrator TROWELING completed, should be promptly covered the use of concrete curing membrane, conservation, to prevent early cracking.

3.1.7 pipe through the wall, waterproofing expansion joints: pipe through waterproof concrete structure in place, embedded casing, casing sealing ring on the plus welding, welding close to full Install wear tube, through the first pipeline embedded casing and pinpoint the location for temporary fixed and then end with a seal weld steel casing and the other end casing with waterproof sealant to fill the gap close, and the steel block with a tight seal. Expansion joint waterproofing, leveling layer of cement mortar 1:2, JS waterproof coating on the second side to do an additional layer of joints, each side is not less than 300mm, addition of a polypropylene fabric. Constructed as shown:
3.1.8 waterproof floor and walls, construction joints -5.85 ~ -4.85 at the following chart: closed steel water stop joints.

3.1.9 the second floor construction joint set as shown above, in-7.50m,-6.65m at the sandwich thrown at the roof and roof beams of steel.

After pouring the practice see 3.1.10 G (Shi -04.

3.2 Quality assurance measures
3.2.1 basement floor, walls to waterproof concrete construction in strict accordance with design requirements of concrete strength and water resistance rating of concrete preparation, to ensure the quality of the self-waterproof concrete to meet the design requirements.

3.2.2 The materials must have a factory certification and performance test reports, and the re-examination of qualified, non-conforming material is strictly prohibited.

3.2.3 The strength of not less than cement 32.5R ordinary portland cement, sand, stone should meet the specification standards, the largest stone size less than 30 mm, water absorption of less than 1.5%, water use does not contain harmful substances in water, admixtures used regular manufacturers of high reliability products. a variety of materials to be inspected, pay attention to the rain of sand, stone and water content determination, as well as the construction mix adjustment.

3.2.4 waterproof concrete preparation, design concrete strength C30, within the mixed pumping agent M17-10, expanders UEA-H. Waterproof concrete on-site mixing of concrete, the concrete used in each tank by a variety of raw materials, vehicles must be weighed, to ensure the water quality of concrete to meet the design requirements.

3.2.5 Concrete pouring water, using a method of pouring the completion of construction, construction day and night, without leaving any construction joints, to ensure dense concrete pouring water, and wipe several times with the pressure of construction technology to improve the water level to ensure that anti-leakage effect.

3.2.6 Construction of waterproof concrete, the pull tab with a fixed template through waterproof concrete structure, should be used to seal puller, internal steel structure, support must not contact the template, to ensure against leakage of concrete construction quality.

3.2.7 In the waterproof concrete wall structure, where intensive management through, should take the same strength grade of fine stone waterproof concrete pouring to ensure dense concrete pouring water, not leakage.

3.2.8 waterproof concrete pouring has been completed, you should immediately conservation, insulation, and fully maintain the concrete moist state, curing time of not less than 14 days. Links to free download http://www.hi138.com