4 kinds of methods of steel structure interlayer

The steel structure mezzanine is used to build the steel structure composite floor in the floor of the residence, office building, workshop, venue and other buildings with too high net height, so as to change the first floor into two floors, that is, to reasonably use the space to increase the area of use, without damaging the appearance of the original.

Steel mezzanine is available for different building types.

Take root

Steel sandwich safety one of the key of “root”, the so-called root is the new steel structure of the mezzanine floor load through the girders, is passed on to the root of the root to the original structure, like a tree without strong root tree can’t stand, in the actual construction must first determine whether fixed point bearing structure, the second is the detection of the original structure of hardness, thickness, reinforcement, etc., (the bearing structure or can’t meet the original structure construction, you need to do to support independence, but independent support components also needs to be done on the components such as bearing beam), as far as possible when turning hole don’t interrupt the main reinforcement, in strict accordance with the technical requirements of depth, diameter of holes,Anchors are provided according to roof load.The hole must be cleaned before the anchor bolt implantation, otherwise the anchorage strength will be seriously affected. The rotation speed should not be too fast during the implantation, which will result in incomplete drug mixing and too slow drug running, which will reduce the drawing force. After the implantation, the construction can be carried out according to the waiting time of temperature.For the fabrication of the embedded plate, the embedded plate is a couple of anchor bolts. The thickness and area of the embedded plate are calculated according to the total load of the main beam (the value reinforcement anchor plate is larger than that of the high-strength bolt anchor plate to make up for the low success rate of the value reinforcement).During installation, the anchor and bolt should be pulled out. For those with small shear force, the soil method can be tested. When drilling holes in all the embedded plates, the reinforcement should be considered.If there is a gap between the embedded plate and concrete beam or concrete column, it can be treated with glue or grouting material. After all anchors are solidified, the main beam can be loaded.

Main girder

Girder in sandwich steel structure engineering is a key to safety in another, if a tree roots again good and trunk can’t bear the external force is in vain, the choice of main girder and roofing load-bearing, span is directly related to, if can choose little span beams, or h-beam, steel beam after the chosen polishing cleaning, cutting, primer and so on, to the scene measured on both ends of the anchor in the fine cut, mezzanine and other steel structure engineering, most of the length of the beam purlin is indefinite length, so the measured after the cut, if choose as far as possible little span steel.

The connection

The interlayer construction of steel structure is mainly the connection of steel beam.

Steel structure sandwich construction is mainly steel beam connection, 1 welding, 2 high strength bolt connection.In large projects generally use high-strength bolt connection or welding, because the site and welding power allow this is not to say, in the steel structure sandwich site is often a narrow space, the main beam is difficult to enter, even in the outside disconnect in the access connection, mechanical easily not used, manual lifting and shoulder splices in the hoisting steel beam connection.

Method 1: steel structure cement pressure plate composite floor

Practice: Secondary beam purlin (spacing 600mm or so) + cement fiber board (or OSB osson board) + about 40mm thick fine stone light concrete (optional) + decorative surface layer;

The structure scheme has the advantages of low cost, light dead weight and short construction period.It is suitable for the mezzanine transformation of civil residence, office building and industrial projects.When there is a large floor load or vibration load, choose carefully;

Method 2: steel structure concrete composite floor slab

Method: steel structure floor plate + about 100mm thick reinforced concrete plate + decorative surface layer;

This scheme has the characteristics of high safety performance, large load bearing, no vibration, good sound insulation effect and so on.Applicable to different large and small span of the building pattern, such as residential buildings, office buildings, all kinds of workshop, heavy load and vibration load floor, etc., the most widely applicable scope.

Method 3: steel structure light weight board combination floor slab

Method: about 100mm thick ALC aerated concrete plate + about 30mm mortar screed layer + decorative surface layer;

This structure combination scheme is safe and environmental protection, light weight, high strength, durable without deformation, fast construction, short construction period, good insulation effect, installation can also be equal to the upper flange of the steel beam, the maximum use of effective space.Applicable to office buildings, residential buildings, light workshops, etc.Industrial projects with large floor loads or vibration loads should be carefully selected.

Method 4: steel structure steel plate combination floor slab

Practice: secondary beam purlin (or stiffened rib) spacing less than 600mm+ decorative steel plate (or grid plate) + about 40mm thick fine stone concrete (optional) + decorative surface layer (optional);

This structural combination scheme is suitable for industrial workshop, workshop, equipment and other buildings, good load-bearing effect, fast construction, etc., insulation and sound insulation effect is slightly worse.

1. The design and construction principles of the new mezzanine floor are as follows:

(1) Select the appropriate form of mezzanine floor by comprehensively considering the use function, energy saving and heat preservation, sound insulation and noise reduction, environmental coordination and other factors.

(2) Safety of structure First, the structural part should be calculated and analyzed, and the appropriate beam column section form and section size should be selected.The sandwich structure should not be connected with the beam and column of the original structure and should not destroy the original structure.

(3) The added weight of the mezzanine floor is as light as possible to reduce the dead load on the original structure;

(4) Construction is convenient, and the less influence construction has on other areas, the better;

2. Choose steel structure or pure concrete structure for new mezzanine floor:

Some clients have asked whether they would prefer a steel mezzanine floor or a concrete mezzanine floor.In fact, the vast majority of new mezzanine floors are steel (one of the four types of steel) and few are pure concrete.The reasons are as follows:

(1) The main advantage of steel structure sandwich is its light weight.Under the same conditions, the dead weight of concrete floor beams is 3-5 times that of steel floor beams.In general, the dead weight of steel sandwich floor is less than 100kg/m2 (the dead weight of steel concrete composite floor is slightly heavier and reaches about 300kg/m2), but the dead weight of pure concrete floor is more than 350kg/m2.The dead weight of steel mezzanine floor is significantly lower than that of pure concrete floor.

(2) Steel structure sandwich is mostly dry operation, convenient construction, few construction measures, fast construction speed, small impact on other surrounding areas.The pure concrete sandwich floor needs to be set up on site with scaffolding, supporting formwork, rebar binding, beam and slab concrete. There are many wet operations, many construction procedures, many construction measures, long construction period and great impact on the surrounding environment.

Therefore, the vast majority of new mezzanine floor is steel structure mezzanine.So how do we choose between these four approaches?Specific selection of which type of steel structure sandwich, you can find the corresponding steel structure company for evaluation, calculation, design.Different use or different building types, construction that type is more economical and reasonable, but also need professional designers to decide!