What are the pouring methods of reinforced concrete?

The pouring construction of reinforced concrete, the commonly used methods at present are: when the concrete drop is small (not more than 2 meters) is poured directly with a concrete tanker, and when the drop is large, a chute, collusion, a chute are used for pouring;Concrete pump truck (including ground pump) pouring;Underwater concrete is poured with a conduit.

Before pouring concrete, the reinforcement formwork is first tied, that is, the steel bar is fixed to the desired structural shape with iron wire, and then covered with a formwork on the outside of the steel skeleton. Finally, the concrete is poured in, and the mold is removed after curing to reach the strength standard, and the obtained is reinforced concrete.

The pouring of concrete is poured from one end to the other end, and the method of horizontal segmentation and oblique layering is adopted, and the pouring method is as follows: the pouring direction is to progress from one end of the beam to the other end in order. When approaching the other end, in order to avoid the concrete at the beam end to produce honeycomb and other undense realization images, the material is fed from one end to the opposite direction, and the dragon is closed at a distance of 4 5m from the end.

Layered blanking, vibrating, each layer thickness should not exceed 30cm, the upper layer of concrete must be vibrated in the lower layer of concrete.

It can only be poured after compacting to ensure that the concrete has good compactness. Prestressed concrete.

The horseshoe part of the beam is densely reinforced, and in order to ensure the quality, the horseshoe part can be poured first, and then the web can be poured. The concrete of the diaphragm and the web are poured at the same time, and the pouring should be layered and operated in parallel.

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At present, there is only cast-in-place commercial mixing, and the secondary structure can be self-mixed.

The methods of concrete pouring usually are: when the pouring drop is small (less than 2m), the concrete tanker is directly poured;When the drop is large, the string drum, the chute and other devices are adopted;Concrete pump truck pouring (including ground pump);Underwater concrete is mostly poured with conduits.

Concrete is poured under the mud, and the concrete is poured with a conduit in a slot filled with cement slurry.

Underwater concrete pouring, pouring at a designated location underwater.

Shear wall concrete pouring, while pouring columns and walls of the same concrete strength.

Concrete is poured in layers, with comprehensive layering, broken layering, and oblique layering.

The pouring construction of reinforced concrete, the commonly used mode at present is: when the concrete drop is small (not more than 2 meters) is poured directly with a concrete tanker, and when the drop is large, a chute, collusion, a chute are used for pouring;Concrete pump truck (including ground pump) pouring;Underwater concrete is poured with a conduit.

1) The concrete should be poured before the initial setting, if there is a preliminary setting phenomenon, it should be stirred once vigorously to restore its fluidity before it can be put into the mold; If there is segregation, it must also be remixed before pouring.

2) The free-fall height of the concrete. When pouring concrete, the free height of concrete falling from a height should not exceed 2m, and the free falling height should not exceed 3m in the vertical structure, otherwise it should be cut along the string drum, chute, slip pipe or vibrating chute to prevent segregation of concrete due to excessive free fall height.

3) Before pouring the vertical structural concrete, the bottom of the pouring place should be filled with cement slurry or cement mortar with a thickness of 50 loomm and the same composition as the mortar in the concrete.

4) Layered pouring of concrete. Concrete pouring should be carried out in layers so that the concrete can vibrate and compact, and the upper concrete should be poured and vibrated before the lower concrete sets. The thickness of the concrete pouring layer should comply with the regulations.

5) The concrete pouring work should be carried out continuously as much as possible, such as the upper and lower concrete pouring must be intermittent, and the maximum duration of the interval (including the entire duration of transportation, pouring and intermittent) shall not exceed the regulations.

6) Retention and treatment of construction joints.

If the concrete cannot be poured continuously due to technical reasons or the limitation of equipment and manpower, and the intermittent time in the middle exceeds the allowable time, the construction joint should be determined in the appropriate position in advance. Because the adhesion of the old and new concrete is poor, it is a weak link in the component, so the construction joint should be left in the part where the structural force (shear force) is small and convenient for construction. Horizontal seams should be left for columns, and vertical seams should be left for beams and plates.

Concrete pouring refers to the process of pouring concrete into the mold until plasticization, in civil engineering and construction projects, concrete and other materials into the mold to make a predetermined shape, concrete pouring, the free height of concrete should not exceed 2m, when more than 3m should take corresponding measures.

Process: Cleaning: Before pouring, the garbage, soil, oil stains and other debris on the steel bar in the template should be removed, and the cement mortar cushion block and plastic cushion block of the steel bar should be checked to see if it is well mated.

Concrete mixing: determine the amount of various materials in each tray according to the mix ratio, and the moisture content of the aggregate should be measured frequently and adjust the water consumption of the mix ratio in time. Concrete Transport:

When pumping concrete, it is necessary to ensure that the concrete pump works continuously. Vibrating requirements: the free falling height of the concrete from the material port shall not exceed 2 meters, and measures must be taken when it exceeds 2 meters.

Column pouring: the bottom of the column should be filled with 5 to 10cm thick and concrete mix ratio of the same halved stone concrete, column concrete should be layered vibrating, the thickness of each layer is not more than 50cm when using the plug-in vibrator, the vibrating rod shall not touch the steel bar and embedded parts. Beam slab pouring:

The beams and slabs of the ribbed floor slab should be poured at the same time, and the pouring method should be started from one end with the slurry method. Staircase pouring: Staircase concrete is poured from the bottom up.

There are several methods for the construction of concrete structures:

1. Direct pouring construction: the prepared concrete is directly poured into the predetermined position by equipment or manual rolling.

2. Two-way pouring construction: a horizontal conveyor belt is used to deliver the concrete to the opposite sides, and then poured in from both sides at the same time.

3. Semi-film curing application: cover the pre-broken cement tape on the substrate, and fix the anchor to make it firm and immovable; It is then poured into high-performance concrete on a substrate.

4. Vacuum flow pouring has been applied: vacuum treatment is carried out on the color plate or unclosed part, released from the storage container equipped with a vacuum pressurization device, and the flow will not be skewed away by the action of gravity.

Structural Designer].

In fact, there are three types: cast-in-place integral, assembled integral, and prefabricated assembly.

1.Cast-in-place monolithic.

Meaning: That is, all components are supported by on-site formwork, on-site pouring of concrete, and on-site maintenance.

Advantages: good integrity, large stiffness, good seismic and impact resistance, good waterproofness, strong adaptability to irregular planes, and easy to open holes.

Disadvantages: A large number of templates are required, the amount of work on site is large, and the construction period is also long.

2.Prefabricated and prefabricated.

Meaning: That is, the components are first made in the factory or prefabrication yard, and then installed on the construction site. Search.

Advantages: high branch base: can save the formwork, improve the construction conditions during production, improve labor productivity, speed up the construction progress, disadvantages: integrity, stiffness, poor seismic performance.

3.Assemble monolithically.

Meaning: The assembly integral type is also called the prefabricated type, that is, after the prefabricated slabs, beams and other components are hoisted in place, the reinforced concrete is poured on it or at the junction with other parts to form a whole, so that the assembly integral type is formed.

Features: The integrity and seismic resistance of the assembly type are between the other two. Template consumption and bulk production fall somewhere in between.

The pouring construction of reinforced concrete, the commonly used methods at present are: when the concrete drop is small (not more than 2 meters), it is directly poured with a concrete lifting width soil tanker, and when the drop is large, it is poured by using a noisy liquid tank, collusion, and a slip pipe; concrete pump truck (including ground pump cavity) pouring; Underwater concrete is poured with a conduit.