The thermal insulation performance of dry hung stone, how to construct the insulation of dry hung st

Dry-hung stone on the exterior walls.

It does not play a role in heat preservation. If you want indoor insulation, you need to make an insulation layer on the exterior wall, and then dry hang the stone.

There are two types of external wall insulation:

1. Dry-hung marble on the exterior wall, generally with 80-120kg m32, and the exterior wall is brushed with painted rock wool board.

Generally, more than 150kg is used. The thickness is determined by regional temperature differences.

Dry-hanging stone is a construction process for building exterior walls. Stone dry hanging.

The method is also known as the empty hanging method.

It is a new type of construction technology in the current wall decoration. In this method, the facing stone is directly hung on the wall or on the steel frame with a metal pendant, and there is no need for grout pasting. The principle is to set the main stress point on the main structure, and fix the stone on the building through the metal pendant to form a stone decorative curtain wall.

The process is to use corrosion-resistant bolts and corrosion-resistant flexible connectors to hang granite, artificial marble and other facing stones directly on the outer surface of the building structure, leaving a 40 50mm cavity between the stone and the structure. The finish made with this process allows an appropriate amount of displacement under the action of wind and ** force to absorb part of the wind and ** force without cracking and falling off. When the wind force disappears, the stone also resets with the structure.

There is a difference in the decorative effect, and the difference is even greater.

These are two completely different systems. The dry-hanging marble system needs a keel, and the insulation layer and the stone can be done separately or compounded together; The insulation layer and the finishing layer of the exterior wall decoration insulation integrated board are compounded together, and the fixing method is generally combined with adhesive anchors, and it can also be hung dry.

In terms of decorative effect: the dry hanging system is very beautiful, but the disadvantage is that there may be color difference; The exterior wall decoration insulation integrated board system can achieve a real imitation marble effect, the color difference is very small, and the disadvantage is that it is not natural marble if you look closely.

**Aspect: It is normal for the dry hanging system to cost more than 500 yuan, even more than 1,000 yuan; The cost of the exterior wall decoration and insulation integrated board system is generally about 300, and the complex practice will not exceed 500.

Environmental protection: At this stage, the environmental protection policy is very strict, and the dry hanging system uses natural marble for decoration, which has been greatly restricted, and the quantity and quality are not guaranteed; The materials used for thermal insulation and decorative integrated boards are very little affected by environmental protection policies.

In terms of self-cleaning: after the surface of the exterior wall decoration and insulation integrated board is covered with a special light covering process, it can maintain good self-cleaning, no ash, and can be kept bright and clean for a long time after being washed by rain; Natural stone has relatively poor self-cleaning.

In terms of connection security: the rigid connection of the dry hanging system is very secure; The exterior wall decoration and insulation integrated board system uses the fixing method of adhesive anchor combination, and the safety is greatly affected by the quality of the adhesive mortar.

There are a few other not-so-good things about marble:

First of all, the application height of dry-hung marble has limitations, according to the relevant standards, the height of dry-hung marble shall not exceed 27 meters;

Secondly, the weight of marble is much heavier than the integrated board of the same area, so the construction is more difficult, the labor cost is high, and the keel needs to be welded, and the construction period is long, more than 50% longer than the construction period of the integrated board;

In addition, the marble color is more serious, and the integrated board finishing layer is prefabricated in the factory with fully intelligent automatic spraying equipment, and the spraying is stable and will not appear color. And in terms of service life, the system can achieve the same life as the building without water seepage.

First, the process flow: base treatment, measurement and pay-off, stone keel separation, installation, cutting rock wool board, pasting rock wool board and fixing it with plastic expansion bolts, concealed inspection and acceptance of rock wool board, dry hanging stone, glue curtain wall special acceptance.

Second, according to the design requirements of the building exterior wall, the stone keel is measured and set off, and the stone keel is installed.

Third, rock wool board cutting and installation: according to the spacing of the stone keel, the rock wool board is cut, and the horizontal direction is staggered from bottom to top. Starting from the corner of the wall, the fixed panels are connected vertically and staggered.

The rock wool boards at the yin and yang corners are staggered and interlocked. The rock wool board at the four corners of the door and window openings shall not be spliced, and the whole rock wool board should be cut into shape, and the incision shall be perpendicular to the board surface, and the corners of the wall shall be pasted and fixed with the same insulation board. The top and bottom of the board should be staggered, and the staggered distance should be 1 2 plate length.

The width of the narrow strip rock wool board for embedding shall not be less than 150mm.

Fourth, rock wool board fixation: the depth of the rock wool board anchor installed into the structural wall is not less than 50mm. 8 120mm plastic expansion bolts are selected for anchorage, and electric hammers are used to drill holes in the outer wall, and the hole diameter is 12mm; The hole depth is 120mm (including the thickness of the insulation board), so that the rock wool board is closely integrated with the exterior wall.

After the anchor point is fastened, it should be 1 2mm lower than the surface of the rock wool board. The arrangement of anchorage points: anchorage points are set at the four corners of the rock wool board and in the middle of the horizontal joints.

The installation of anchor bolts is 300mm longitudinal spacing, transverse spacing is 400mm, plum blossom arrangement, and the corners of the base wall are encrypted to 200mm spacing, and meet the requirements of design and related standards.

Fifth, rainproof and damp measures: before the top of the rock wool board is not hung with stone glue, cover it with a plastic cloth to prevent rain from leaking on the inside of the rock wool board.

Sixth, the standard value of tensile bearing capacity of a single anchor bolt is greater than or equal to.

Seventh, all professional types of work in the construction should be closely coordinated, reasonable arrangement of the process, and it is strictly forbidden to reverse the process operation.

Eighth, heavy objects should be prevented from hitting the wall and damaging the rock wool insulation board, and repaired in time once found.

Ninth, inter-layer fire prevention: at the elevation of the floor slab item on each floor, set up an inter-layer fireproof closed isolation zone around the wall, because the inner surface of the exterior wall stone is 200mm void from the outer wall, in order to prevent the fire from occurring, the fire spreads from this gap to the upper layer, so the inter-layer fire isolation zone is set up, the material is made of thick galvanized steel plate 50mm thick fireproof insulation mineral wool board, one end of the galvanized steel plate is fixed on the outer wall with nails, the nail spacing is 500mm, and the other end is fixed on the transverse angle steel keel.

1. The insulation material should be made of quality-approved insulation material in accordance with the design requirements, and should have good compressive strength and crack resistance, which can meet the design requirements.

2. The binder should use a quality-approved binder, and should meet the provisions of the relevant standards.

3. The installation should ensure the firmness of the insulation material, and the thickness of the insulation layer shall not be less than the required value of the design requirements.

4. For the insulation layer exposed by cracks, the protective treatment of the wall or steel bar terminal should be carried out to prevent the damage of the insulation layer by water seepage of mixed permeable bright concrete.

5. The hanging stone should be made of quality-approved hanging materials, and should be installed in accordance with the design requirements to ensure the firmness and correctness of the hanging stone.

6. The quality approved wall materials should be used to ensure the strength and flatness of the wall.

7. After the installation is completed, the surface of the hanging stone should be waterproofed to prevent water from penetrating into the insulation layer.

8. After the installation is completed, the surface of the hanging stone should be treated with anti-corrosion to prevent the corrosion of the insulation layer.

(1) Welding of connectors.

Generally, the installation process of "embedded parts + connecting plate + stainless steel pendant" or "embedded parts + connecting plate + steel keel + stainless steel pendant" is used to fix the stone; The embedded parts have been completed during the construction of the structure. It is particularly important to ensure the welding quality of the embedded parts, connecting plates and keels, and the firmness and durability of the external finish.

The following requirements are made:

Clean the weld before welding, and there should be no oil and rust around the weld. During the welding construction, the embedded plate, connectors, section steel, welding rods, and welding currents of the same thickness should be taken under the witness of the owner's on-site representative and the supervision party to make welding specimens under the same conditions, and sent to the quality supervision and inspection department for testing.

The welding speed should be correctly mastered during formal welding, and constant velocity welding should be required to ensure that the thickness and width of the weld are uniform. Welding procedures should be implemented for the arc length (3mm), welding angle (biased to the angle steel side), arc striking and arc closing. After removing the slag, carry out a self-inspection of the appearance and weld size, and confirm that there is no problem before transferring the location to continue welding.

2) Stone installation.

First of all, the specifications of the plate should be checked according to the sample drawing, and the plate end slotting and plate installation should be carried out after the check is correct. In order to ensure the quality of the slotting (verticality, slot depth, slot position), the following measures can be taken:

Wooden stone fixing frames are made on site, and the stone slabs are fixed before slotting. Align the T-pendant up and down the slot, mark the position and then slot. The depth of the groove is pre-adjusted with a marble machine and a ruler rod, and the ruler rod is used to hold up the stone, and the groove depth is 16mm.

Self-inspection should be carried out after the slotting is completed, including the depth, position, verticality, and whether the stone on the side of the groove is split.

Before the stone is put on the wall, remove the floating dust and stone slag in the groove; After the test hanging (see the following table for the requirements of plate position and plate vertical), the groove is filled with glue, the installation stone is installed, and the ruler is checked. The allowable deviation of the exterior finish shall meet the requirements of the "JGJ73-91" specification.

3) Caulking. First of all, use a special board brush to clean the stone slab joints, remove the deposits, pollutants and powders in the joints, and then apply acetone water twice to increase the adhesion capacity of the sealant.

Wide-seam stuffed foam caulking strips. The caulking strip is 20, and the filling depth should be straight and consistent (8mm away from the stone plate surface), no overlap, and the joint should be tight and free of gaps when the pendant is disconnected.

The caulking glue is a U.S.-made DC silicone sealant, and the glue is pasted with a rubber strip to avoid contamination of adjacent stones, and the colloid is an arc-shaped concave section after the stone is embedded, and the concave surface is far from the surface of the stone. The caulking of the glue gun is completed in one section, and the speed should ensure that the caulking is free of bubbles and continuous gluing. The caulking glue distillation should be completed at the time of initial setting to ensure a consistent shape.

First do a good job of hanging the stone bracket, of course, this bracket leg should be long, enough insulation thickness. If you are making inorganic insulation materials, you can bracket the back plate first, and then pour the insulation materials, so that the layers go up.

After fixing the stone keel, fill the gap between the keel with a certain thickness of insulation cotton.

To do a good job of stone keel, it is generally more to do thermal insulation rock wool after the main keel!

Construction method and steps of building self-insulating wall and dry-hanging stone:

1. First of all, according to the structure, the position of the embedded parts of the dry-hung steel is reasonably designed, and the civil construction unit is required to set the position of the structural column according to the requirements when the construction is disclosed, because the rear anchors are not allowed to hit the filling wall, and must be set on the reinforced concrete; Dry hanging stone exterior wall insulation tool Hebei electric hanging basket.

2. Carry out steel plate buriing, after the burial is completed, the cold bridge part is insulated, the wall is self-insulation, that is, the insulation treatment is done at the concrete beam, plate and column, usually the insulation board is used, and for the steel embedded parts, the insulation particles or insulation mortar can be used for local treatment.

Dry-hung stone must be calculated by design, otherwise there may be greater hidden dangers, and the anchors placed behind must be done on-site pulling experiments.

After doing a good job of thermal insulation, the keel will destroy the thermal insulation.

The commonly used exterior wall dry-hanging stone is mainly granite, and the varieties mainly include sesame white, ** hemp, Kalamaili gold, yellow rust stone, cherry blossom red, etc. The main processing surfaces are mainly lychee noodles, fire noodles and smooth surfaces. The color difference of stone is one of the most important factors affecting the appearance of stone dry hanging.

In the construction process, we should try to pick the color for paving, so as not to affect the overall appearance.

The dry hanging method of exterior wall facing stone is to use high-strength and corrosion-resistant metal pendants to fix the facing stone on the outer surface of the building by means of support, hanging, pin and bolt. Reasonable pendant design and strict construction technology are the key to ensure the safety and beauty of the exterior stone. Dry hanging construction replaces the traditional wet work construction with prefabricated assembly, and its advantages are mainly reflected in:

a.It can avoid surface pollution, discoloration and "anti-alkali", so that the slate can maintain its color luster.

b.It can avoid wet operation, reduce the impact of climate change, and save the cost of winter and rain application.

c.It can avoid the stone falling off and reduce the maintenance cost.

d.Continuous operation can increase the speed of construction.

e.The weight of the structure is reduced and the insulation space is reserved.