Pump concrete pouring
Source: | Author:lichengcn | Publish time: 2017-08-24 | 20 Views | Share:
1. Preparation before concrete casting:
      (1) organize the construction team to perform the technical background. The class team must be familiar with the drawings and specify the requirements of various technical factors in the construction site (concrete strength grade, anti-seepage grade, initial setting time, etc.).
      (2) organize the shift inspection of steel bars and templates and fail to carry out concrete construction without concrete construction conditions.
      (3) organize construction equipment, tools and supplies, etc. to ensure good.
      (4) water moistening the template before pouring. The cleaning of the wall and column template should be closed after the removal of debris and water.
2. General requirements for concrete pouring:
      (1) the free fall of the concrete from the head of the bucket shall not exceed 2m, and measures must be taken when it exceeds 2m.You should use a tube, tube, chute or a hole in the side of the template.
      (2) when casting concrete, the concrete shall be divided into sections, and the height of each layer shall be determined according to the structure characteristics and the steel reinforcement.The average layer height is 1.25 times of the part length of the insert vibrator and the maximum is no more than 500mm.The thickness of the plate vibrator is 200mm.
      (3) add the architect site to favorites to start the vibrators, vibrating hand holding the flexible shaft at the top of vibrating rod rubber hose, quick insert inside concrete, vibrating, vibrators and slightly twitched, vibrating time of 20 ~ 30 seconds, but in concrete surface no bubbles, no longer significant sinking, pan pulp and surface formation on the surface level shall prevail.The insertion type vibrator should be used for the fast insertion, the insertion point should be evenly arranged, and the point by point shall be moved in sequence, which shall not be left out in order to achieve uniform vibration.The moving spacing is not greater than 1.5 times of the radius of the vibrating rod (generally 300 ~ 400mm), and the distance of the template should not be less than 200mm.When vibrating on the upper layer, the lower concrete surface should be inserted between 50 ~ 100mm to eliminate the seam between the two floors.The motion spacing of the plate vibrator should ensure that the vibrator's plate cover is partially on the edge of the solid part.
      (4) concrete shall be poured continuously.If intermittent, its interval should be reduced as far as possible, and should be finished before the concrete of the front layer concrete.The maximum time of the interval shall be determined according to all cement types and the initial conditions of concrete, and generally more than 2 hours shall be handled according to the construction joints.
      (5) should be hold people often observe template reinforced concrete, reserved holes and embedded parts, steel dowel presence of displacement deformation or congestion, and found that the problem should be watered immediately and should be in already pouring concrete initial setting before finishing.
      (6) after the casting is completed, check whether the surface of the steel bar is contaminated by concrete and scrubbed clean.
3. Concrete pouring:
      (1) before the wall is cast, or the newly burned concrete and the lower layer of concrete are in place, the cement mortar with the same ratio of 50mm thick and concrete shall be evenly poured on the bottom surface.The mortar is applied to the mould, and the hopper is not poured directly into the mould.
      (2) wall concrete shall be layered and vibrating, and the thickness of each layer shall be controlled at about 500mm.The material points of concrete should be dispersed and arranged in a continuous process.
      (3) when casting the hole of the wall, the concrete height of the two sides of the hole should be roughly the same.More uniform dense concrete vibrating, especially the wall thickness is small, Windows and doors hole structure reinforcement and connection staggered steel bar is dense, should use Φ 25 vibrators, other wall beam parts adopt Φ 50 vibrators, considering the wall humanly scaled the wall of concrete sealing mode cannot directly after vibration, can be reserved in advance will be humanly scaled down the mouth mouth, after waiting for concrete pouring to the location and vibrating compaction sealing mode and reinforcement.When vibrating, the vibrating rod should be more than 300mm from the edge of the hole and vibrate simultaneously from both sides to prevent the hole from deforming.The bottom template of the big hole should be opened and added.
      (4) constructional column concrete shall be layered and shall not exceed 300mm per layer.
      (5) construction seam setting: the wall should be located within 1/3 of the span of the door and window opening.The vertical joints of other parts of the wall shall be set by the construction plan.The horizontal seam of the column is placed under the main beam.
4. Concrete pouring of beams and plates:
      (1) the ribbed slab beam slab should be casting at the same time, the method of casting shall be end with "cast slurry method", the stratified pouring into stepped beam first, when reach the floor position again with concrete slab casting.
      (2) the hollow thickness of the floor shall be slightly larger than the thickness of the slab, and the vertical casting direction of the plate vibrator shall be used to vibrate.Continuously use the movement sign to control the thickness of the concrete slab.When the vibration is finished, wipe the surface with a ruler or drag plate.
      (3) when the beam and the plate are connected to the whole of the column and the wall, it shall be suspended for 1-1.5 hours after the column and wall are cast, which will give it a preliminary and solid foundation and then continue to pour.
      (4) construction seam setting: it is appropriate to pour the floor slab in the direction of the secondary beam, and the construction joints shall be placed in a 1/3 radius of the secondary beam span, and the construction joint surface shall be perpendicular to the axis of the secondary beam or the plate surface.The construction joints of the single - board are placed in any position parallel to the short side of the plate.
      (5) wooden board and wire mesh for construction joints.
      (6) the compressive strength of the concrete shall not be less than 1.2 Ppa, which shall be allowed to continue pouring.
      (7) to continue pouring concrete in the construction joint, the concrete construction seam surface shall be chisel, remove the loose stones and rinse with water.After removing the water, water a layer of cement or cement mortar with the same ratio of concrete, then continue pouring concrete.
      (8) the construction of the wall shall be handled according to the construction of the wall.
5. Stair concrete pouring:
      (1) the concrete of the stairway is poured from the bottom up.First, the concrete of the base plate is vibrated, and the stepping position and the step concrete are poured together, and continuously pushed upward continuously, and the surface of the step surface is smoothed with wood float at any time.
      (2) the stair concrete should be completed continuously.
      (3) location of the construction: according to the structure, it can be set in the span of the stair platform or 1/3 of the staircase.
      (4) when the concrete is cast, the concrete is constructed according to the high strength grade concrete, and the boundary surface is 500 at the side of the wall.
6. Maintenance of concrete:
      1. After the concrete has been cast, it should be covered within 12 hours and watered and maintained.
      2. The date of concrete watering and curing shall not be less than 14 days if the concrete is mixed with retarded admixture or anti-osmotic requirement.Before the concrete strength reaches 1.2mpa, it shall not trample or construct vibration on it.The column and wall die for more than 2 days, and then continue watering and curing after the mold is removed.
      3. Daily watering should keep the concrete in sufficient condition.Twice a day at normal temperature.
      4. Large area structures such as floor slab, floor, roof and other water storage maintenance, such as water storage, can be removed after removing the internal template and after concrete reaches a certain strength.
      5. Can spray the curing agent, form protective film on the concrete surface to prevent water evaporation and achieve the purpose of maintenance.
      6. When covered with plastic film, the surrounding area should be pressurized and should be kept in the film.