The cast-in-place concrete of reinforced concrete should be a better way to build a loft if space conditions permit. It is affordable, reliable, and long-lived. The concrete floor is permanent, and the normal service life is 70 years. According to the normal construction process, the service life is 70 years. Before the construction, please design the company to do the planning, design and layout of the floor. At the same time as the user to understand how to use space, he himself If you need a large space for practical purposes, you will need more area on the attic floor, concealing points on the stairs, making small points, and practical points. The following introduces a brief introduction of concrete cast-in-place loft construction technology for your reference.
First, the premise of building penthouse:
1, must have enough floor height. The lower edge of a single-story attic floor is not less than 2.6 meters. The net height of the attic floor and roof is not less than 2.4 meters, and the minimum is not less than 2.2 meters. This is based on the premise of having people living. If your loft is unreliable, then you can decide on your own height.
2. The span of the shortest side of the attic should not be too large. In the case of using channel steel construction, it is generally not more than 4 meters and the maximum should not exceed 6 meters.
Second, the type of attic building a common way to build the attic:
1. Steel structure attic. Due to its lighter weight, the steel structure loft will not overload the contact beam and can be anchored with the contact beam better. The stability and safety of the steel structure are unmatched by the cast-in-place of the concrete. Remind the owner: The steel used as a loft must be a national standard, including expansion bolts and welding rods. (It is best to use a drug expansion plug).
2, reinforced concrete poured. The practice of reinforced concrete is a civil construction approach. There are some hidden dangers in concrete lofts:
(1) The load increases more. Since the concrete is heavy, the load on the entire building increases.
(2) The beam seen in the middle of the room is not the general frame beam but the contact beam of the structure. Generally, there are few reinforcements in contact with the beam, which only play the role of a pull knot and cannot bear the load of the entire floor. In fact, The contact beam is deformed under the effect of the newly added concrete slab. Therefore, the wall under the beam must bear the load. In general, the infill wall in the frame structure does not consider the effect of the load. If the load is too large, the filled wall may be cracked or even contacted. Cracked beam. What's more, some construction teams dare to make concrete lofts on hollow bricks, to put it plainly. This is irresponsible to your life.
(3) The construction of concrete slabs is not completed by general decoration teams. Dalian now requires commodity concrete, and it is not known whether the concrete penthouse is a product of concrete or on-site mixing. If it is commercial concrete, it can be better. In addition, reinforcements need to be calculated, and the thickness of the protective layer must meet the requirements. In particular, the end anchorage is the key link. Many places need to be anchored. Do not know whether the general decoration team can do it.
(4) The construction party said that how much it does nothing does not mean that it is really okay. Our house has a certain safety factor, at least the safety factor is reduced. If calculated, the concrete penthouse must not be placed on that contact beam. But you put it up. It didn't fall. It only means that there is some hidden danger.
(5) The so-called ignorant fearless, some teams are now willing to do anything, frame columns are also dare to change cross-section, frame beam casually piercing the hole, not only harm themselves but also endanger the safety of the entire building.
Cast-in-place loft construction technology
Follow the following principles:
1. Fixation method should be adopted for corner fixing. Do not damage the main beam easily.
2. The steel bars must use the national standard rib steel and be bundled into two or four layers.
3. Select qualified cement products and river sand (Cement No. 425# 600 label, river sand, rock, ratio 1:2:3, mix evenly, and shake with special vibrometer. Adopt anchorage).
4, floor slabs to do adequate maintenance.
5. For safety reasons, if necessary, use steel channel support at the corners just in case. These channels can be shielded by design.
6. When the span is too large, be sure to ask a professional structural engineer to perform calculations to avoid the risk of overweight. Need to increase the girder when necessary.
7, this is a highly professional project, must find a professional construction team.
8, reinforcement should be reasonable. As long as the design of the concrete floor reinforcement is reasonable, it can play an early warning role even when major changes occur. We have divided floor reinforcements into ribs, ribs, and ribs. Suitable ribs: The number of steel bars designed is within a reasonable range. Such a floor, once the floor is about to be destroyed, has a prediction: cracks appear. Less ribs are less reinforced, so that the load-bearing capacity of the floor is poor; extra ribs are reinforced more than the scope of the specification, this situation will be a problem when the floor can not reflect the damage situation. So it is not reinforced more More is better.
9, cast-in-place floor demoulding time to grasp well. The strength of concrete rises fastest in 3 days before pouring, from 50% to 50%, 75% in 7 days, 110% in 14 days, and it will still increase at a very slow speed.
Cast-in-place loft floor strength
The concrete with a span of more than 8 meters is ≥100%, ≥75% of 8 meters and 8 meters can be removed; when the strength is ≥1.2MPa, the building can be used for construction and construction. (Generally, the strength can reach ≥1.2MPa 24 hours after pouring, 7~9 days under normal maintenance in spring, summer and autumn, and can be removed 10~15 days under normal maintenance in winter).
Cast-in-place loft maintenance
The hydrating maintenance of loquat is very important for its strength growth and various performance enhancements. In particular, early conservation can avoid surface dehydration and significantly reduce the occurrence of telescoping cracks in the early stages of loquat. Therefore, the necessary maintenance (usually ≥24 hours) must be ensured after the floor is poured. If, in actual construction, the duration of the grab and the watering will affect the operation of the line and construction personnel, the sack must be kept in the construction or Grass bags are properly moisturized for about a week.
Editor's summary: The relevant information on concrete construction technology of cast-in-place loft was introduced here. I hope this article will be helpful to everyone. If you still have something you don't understand, you can leave a message to Xiaobian at the bottom. We will answer your questions as soon as possible.
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