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Article source: Added time: 2018-04-09
Now with the emergence of hollow floors, building facilities have also been widely used. Now let's take a look at the advantages of hollow floors compared with ordinary beam-slab structures. If you want to know, please look down.
One. Technical and economic comparison of the hollow floor (concrete hollow tube) structure. 1. Ordinary beam-slab structure: The solid part of the plate is relatively thin, applicable span is 4m-6m, and the thickness of the plate is about 100㎜—120㎜; there is a secondary beam about 20㎜-30㎜. The beam reinforcement is relatively increased; due to the secondary beam at the bottom, Increased floor height is not conducive to earthquake resistance; the template construction is more complicated, and the plate is easy to be deformed and cracked by temperature after pouring; more secondary beams and column rises are not conducive to the installation of various pipelines such as air conditioning pipes and fire sprinklers, and lighting is limited. Unsightly needs ceiling decoration; it is heavy and easily generates deflections and cracks, which cannot be used for the requirements of large space and long span of buildings. 2. Cast-in-situ (concrete hollow pipe) hollow slab structure: a number of dense ribbed balanced forces are formed inside the slab, and the applicable span is 6m-15m; the secondary beam is eliminated to solve the problem of floor height limitation, reduce the excavation depth of the foundation, Issues such as the construction of foundation pits have shortened the foundation construction period; the bottom leveling support template is simple, which greatly reduces material loss and shortens the construction period; the cast-in-place hollow slab can also improve the temperature deformation of the thick slab and reduce the concrete hardening during condensation Volume shrinkage, hydration heat, temperature cracks and other problems have also been improved during the process; the reduction of self-weight also reduced the column caps and removed the secondary beam, so that the bottom surface of the cast-in-place hollow slab after the completion was flat, which was more conducive to the fire protection of air-conditioning pipes The installation of various pipes of the sprinkler head is not limited to daylighting and lighting, and no ceiling decoration is required.
two. Technical and economic comparison of hollow floor (concrete hollow tube) and hollow floor (PMX lightweight composite square tube) structure. 1. Hollow floor (concrete hollow round pipe): early application in cast-in-situ concrete hollow floor, played a role in structural innovation. However, since its own material is concrete and glass fiber structure, the strength is short in periodicity, and the maintenance and other requirements are strict in production; its own weight is heavy and it is easy to break and form cracks, which is inconvenient for construction, transportation, and installation; Material loss; small circular contact surface is not easy to fix, additional welding of corresponding meshes is required, increasing the binding of steel bars, etc., resulting in increased construction costs; in addition, the concrete hollow pipe head and the body are not formed at one time, often cracking, In the process of pouring vibration, the strength is reduced due to the absorption of a large amount of water, and it is easy to be broken by shock during vibration. The inflow of radon easily causes the false hollow portion to increase the weight of the plate, which can not play the role of hollow well. But at the same time the hollow ratio has decreased. 2. Hollow floor (PMX light composite square tube): Currently, it is mostly used in cast-in-situ concrete hollow floor. Since it is a lightweight composite material, its own weight can be ignored, construction and transportation are convenient, and zero damage rate It saves materials, and has fixed attachments to reduce construction costs and improve construction efficiency. It can be cut and arbitrarily cut, and the pipeline layout is not affected. The square pipe itself is solid and will not form a false hollow in the cast. After the concrete is solidified, the square tube protective film and the material itself do not adhere to the concrete, so a cavity in the slab is truly formed. Insulation and sound insulation are far more effective than concrete hollow round pipes.
three. Technical and economic comparison between the hollow floor (concrete hollow tube) and hollow floor (PMX lightweight composite square box) structure. In addition to the above, the hollow ratio of the concrete hollow round pipe can only account for about 30% of the large slab, and the hollow ratio of the PMX light composite square box can reach about 50%. The self-weight is obviously reduced and the amount of reinforcing steel is saved. The external dimensions of the concrete hollow round pipe are relatively fixed. The PMX lightweight composite square box can reach any size according to the design requirements.
four. Technical and economic comparison of hollow floor (concrete honeycomb square box) and hollow floor (PMX light composite square box) structure. Hollow floor concrete honeycomb square box structure. Because the box is placed directly on the formwork, there is less concrete protective layer at the bottom. After the mold is removed, the concrete shrinks, and the bottom forms multiple honeycomb-shaped concave surfaces; its hollow ratio is about 50%, but The dead weight is 20-25 times that of the PMX lightweight composite square box, which is easy to break and difficult to handle and install. As with the concrete round pipe, the pipeline layout requires horizontal and vertical increase of material loss; absorption of a large amount of water during the in-situ vibrating process reduces the strength, and it is easy to be cracked by vibration when vibrating, and the inflow of radon is likely to cause false hollows to increase the plate. Due to its own weight, it cannot play a good role in hollowness; there is no in-situ concrete protection layer at the bottom of the slab. The bottom of the slab needs to be looked for at the reinforcement ribs. The surface of the finished slab is uneven and needs to be treated separately, even the ceiling decoration. The hollow box floor PMX lightweight composite square box structure is as specified in the regulations, with protective layers on the top and bottom. After the completion, the bottom of the board is flat and beautiful, and can be hung at any position.
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