Concrete small hollow block benzene board insulation composite wall is a new type of energy-saving, heat-insulating and heat-insulating wall. It is used to replace clay brick benzene board composite wall or ordinary clay brick wall with soil conservation and energy conservation. Adding effective use of houses, increasing productivity, reducing labor intensity, and maintaining ecological balance. In the case of people with less energy and less pollution in China, the concrete small hollow block benzene board composite wall has great application prospects.
1Features (1) Small hollow block has less specifications, factory production, light weight and strength can be produced according to design needs.
(3) The thermal insulation benzene board is light in weight, low in water absorption rate, good in fire resistance, moisture-proof and anti-corrosive, convenient to transport, easy to cut, and easy to install. ! 3 The installation of the thermal insulation benzene board is carried out synchronously with the wall, and the fully enclosed protective measures are safe and do not affect the construction period.
Hollow concrete block, benzene board and air three-layer thermal insulation layer, the thermal insulation effect is obviously energy-saving up to 50).
Compared with the internal insulation of the benzene board in the outer wall, the problem of local heat bridge in the wall is solved, and the interior decoration of the user is not affected, the quality of the decoration can be ensured, and the area used is increased to improve the economic benefit.
Lu Jianzhong, born in February 1968, Nantong, Jiangsu, Nantong Shenyong Construction Engineering General Contracting Co., Ltd. 226300 Tongzhou 2003-06-11 Compared with the external wall benzene board external insulation, the local thermal bridge problem in the wall was solved. Defects such as peeling and cracking of the outer wall insulation layer and the main wall ensure the quality of the project, and the skeleton and bonding materials are not used, which greatly reduces the engineering cost.
Pre-buried pipelines such as electric and plumbing are installed along the hollow block holes, which is convenient and quick to be constructed with the same part of the masonry.
2 Process principle Concrete small hollow block benzene board composite wall structure is simple, the inner side of the outer wall (ie the inner wall) uses 190mm thick block as the load-bearing wall, and the outer side (ie outer wall) uses 90mm thick block as the protective wall. There is a 90mm thick benzene board insulation layer in the middle, and then the pull-out mesh is placed on the inner and outer pages. The overall performance of the reinforced concrete core column 2 has been set at both sides of the door and window opening, at the corner of the wall, at the intersection of the inner and outer walls, at the beam support, and at the corners of the stairwell.
3 Process 4 main equipment and equipment lifting, concrete mixer, steel straightening machine, electric welding machine, plug-in vibrating rod, micro vibrating rod, trolley, ashing machine, platform scale, rubber hammer, measuring instruments, etc.
5Material requirements The entry block must have the factory certificate and quality guarantee. (5) The steel mesh must have the factory certificate. The strength grade and variety specifications of the exposed part of the net should meet the design requirements, and the color is the same, no shortage. If the angle is less than 40d, it is forbidden to use the blocks of less than age. On-site stacking must be divided into specifications and models, so that the upper cover is under the cushion, and the height of the moisture-proof and rain-proof drainage measures is not more than 1.6m. The type specifications of the concrete small blocks are shown in Table 1. The compressive strength requirements of the concrete small blocks should meet the requirements. 2, the factory inspection according to the appearance quality grade and strength grade batch test sea 10,000 pieces for a batch of less than 10,000 pieces are also counted in batches.
Place the same wall with the outer wall - re-lay the inner wall - repeat the first-class process flow chart. Table 1 Type, size, size, size, minimum wall thickness, minimum rib thickness, length, width, height, main specification, block specification Block Corner Block Table 2 Small Block Compressive Strength Requirement Strength Grade Compressive Strength / MPa Five Blocks Average Block Minimum Masonry mortar can use admixture to improve the consistency of mortar, the consistency of mortar is controlled at 80~ 90mm, the special mortar will not be more than 2.5h from the end of the agitation. When the mortar is used, it should be stirred frequently to prevent bleeding and workability.
The concrete of the core column is fluid concrete and its slump is controlled at 200~250mm. In order to ensure the slump of the concrete of the core column, the concrete can be used when mixing the concrete.
The specification and performance of the benzene board must meet the design requirements. The benzene board should be flame retardant and the weight should be no less than 18kg/m3, and should be sampled and retested on site. The film must be preserved.
(6) Selection of concrete aggregate: medium sand with mud content less than 39: gravel or pebbles with particle size of 5~10mm and mud content less than 1.5%.
6 Operation points 6.1 Block benzene board composite insulation wall Masonry masonry construction, concrete small hollow block is generally not suitable for watering, but in the case of particularly dry and hot climate, you can spray a little water before the masonry .
Before the masonry, the block and elevation of the control rod should be first disc angle, no more than 3 skins at a time. At the corner of the disc, the wire should be lifted in time to adjust the deviation at any time, and the thickness of the gray joint is controlled. After the child is restored, the double-sided hanging line is built. When the building is built, the inner and outer walls should be built at the same time.
The masonry is layered along the height direction of the wall, and the layering height is determined according to the position of the splicing mesh. Each layer is successively constructed according to the cycle order of placing the benzene plate and placing the splicing mesh in the cavity of the outer wall. . The benzene board insulation wall is as shown.
The external thermal insulation composite wall (4) is surrounded by four joints of the benzene board, and the joints are tight, so as to prevent the vertical joints of the upper and lower layers of the thermal bridge from being staggered. As shown.
After the installation of the bismuth benzene board, the spliced ​​mesh of the inner and outer wall is placed, and the buried reinforced steel or mesh must be placed in the mortar layer and a 5 mm steel head mark should be exposed for inspection. The ribs or meshes must be pre-preserved in the cavity. The shape, size and spacing of the mesh should be placed according to the design requirements.
Blocks should be hole-to-hole, rib-to-rib joints. In some cases, it is impossible to build holes in the hole, but the length of the lap should not be less than 90mm. If it is not guaranteed, the knot should be set in the ash joint. Reinforced or reinforced mesh.
The block should be built up on the bottom (with the back cover), that is, the anti-laying method is used. If a block with a groove at one end is used, the grooved end should be built at one end of the flat head.
Masonry gray joints should be horizontal and vertical, and the mortar is full. All grey seams should be covered with mortar. The fullness of the mortar with horizontal gray joints shall not be less than the fullness of the mortar of the vertical ash joint of 909 shall not be lower than 809. The foundation block under the sill of the sill shall be filled with the foundation part of the masonry and the core concrete for the composite wall of the sill beam Filling.
1 To reduce the shrinkage deformation of mortar after masonry and the loosening of the lower masonry due to the top vibration, strictly control the masonry cycle and the height of the masonry wall is not more than 1.6m. The height difference between adjacent working sections shall not exceed one floor, and guarantee 8 +10d - layer.
(11) The masonry mortar must reach a certain strength (l.OMPa) before the construction of the core column concrete or other cast-in-place works.
The position of the 6.2 core column reserve ribs must be correct. When the first skin block is built, the position of the reserved ribs should be restored and corrected.
The first skin block at the bottom of each stem must be constructed with blocks that have a cleaning port.
The first layer of bricks at the corner of the outer wall indicates that it is difficult to operate during construction due to the use of lashing joints. It is impossible to ensure that the upper and lower core ribs are welded at the cleaning port to ensure the connection quality. Single-sided welded joint lap length 10! Weld thickness is not less than 0.3! The width is not less than 0.7! .
Before the concrete is poured, the floating slurry protruding from the core hole must be cleaned and cleared from the cleaning port.
Before pouring the core concrete, it is advisable to first fill the appropriate amount of de-stone cement mortar with the proportion of the core-filled concrete.
Because the core column concrete and the ring beam concrete are two different properties of concrete, the simultaneous casting is easy to cause the core column to leak and the core column and the ring beam concrete are separately poured.
The upper surface of the concrete core after pouring should be lower than the uppermost block by 50mm to improve the structural performance of the core column and the ring beam.
The core column concrete is cast at a height of 400+500mm. It is not allowed to be poured with a micro-vibration rod for one time to re-vibrate. It is also not allowed to use artificial vibrating column-core concrete for quantitative casting.
In the core column, the prestressed hollow plate should be left notched or made into a cast-in-place plate to ensure that the core column is penetrated up and down to ensure that the section of the core column at the prestressed hollow plate does not decrease.
When casting the core column concrete, the concrete column fixed rod retainer must be used to achieve a certain strength after the core column steel bar fixed concrete column concrete is removed, so as to ensure the position of the core column steel bar.
(11) At the junction of the core column and the wall, a reinforced concrete mesh and wall tie shall be provided for every 600mm along the wall. The steel mesh shall extend into the wall more than 1m. 6.3 Special parts treatment (1) at the beam At the entrance awning, since the outer wall is a non-bearing wall, a 1cm thick benzene board must be placed on the outer wall of the beam as a buffer layer during construction to prevent the outer wall from being cracked.
On each of the unit walls, linoleum paper is laid under the roof panel as a sliding layer to prevent cracks in the roof and the top wall.
Any leather block under the ring beam or cast-in-place window sill should be pre-filled or filled with not less than 5cm as the bottom mold.
In the construction of the cast-in-place beam formwork, it is found that the formwork fixture is likely to cause horizontal cracks at the position of the second to fourth skins under the ring beam, so it is necessary to pay attention to improving the template support method. On the one hand, the 3mm cutting edge can make the ring beam concrete recessed into the wall surface; on the other hand, the template can be supported on the wall body to facilitate the construction of the long triangular wood strip to prevent the template from leaking.
For the line pipe and wire box pre-buried in the wall, the water and electricity personnel are required to send a special person to reserve in front of the wall and explain to the masonry. When horizontal pipelines are difficult to lay, the two rows of blocks in the middle of the block should be opened and sealed with fine stone concrete. The vertical line pipe is embedded in the block hole with the building. Small blocks are strictly prohibited from leaving horizontal grooves on the surface of the masonry.
Switch box, junction box, radiator hook, pipe card, door and window frame, construction mold net, concrete insulation roof structure system engineering application 8 Wang Lijiu 铮钺 Zhou martial arts, roof slabs and steel bars are difficult and wall And the slab concrete can not be poured at one time. In addition, there is a thermal bridge between the wall and the roof panel in the roof structure, which affects the energy-saving insulation of the building. Through the research on the building formwork concrete roofing material; the partial modification of the building formwork product is used in the roof structure, which not only solves the above problems, but also improves the energy saving, heat preservation and waterproof performance of the roof structure system.
In the mid-to-late 1990s, in the construction of residential buildings, in order to improve the seismic and energy-saving insulation performance of buildings, multi-storey residential buildings mostly use reinforced concrete overall cast-in-place roofing combined with polystyrene insulation board (block or perlite insulation block) The system and the new waterproof materials such as SBS and APP form a roof structure system. In order to meet the architectural design requirements for the large open space of the residential building, improve the energy efficiency of the building, and limit the use of the sintered clay brick prestressed concrete roof structure, the lightweight GRC roofing building structure system has been extensive. Used in multi-storey homes.
The ban of sintered clay bricks has led to the emergence of a large number of new energy-saving wall materials in residential buildings. However, if the wall is made of concrete, and the roofing material still uses the traditional ordinary reinforced concrete roof, it will bring two problems. The first is that the building formwork concrete is free from vibration and is not used as a wall. It is difficult to bind the formwork and steel bars of the ordinary reinforced concrete roof slab after the formwork support, which makes the wall and the slab not poured at one time; in addition, in the roof structure, the building formwork concrete wall and the ordinary concrete house There is inevitably a thermal bridge between the panels that affects the energy-saving insulation performance of the entire building.
The above problems were solved by experimentally researching the partial modification of the building formwork product for the roof structure of the formwork concrete building, and the mold net at the outer insulation layer improved the insulation layer and waterproof.
C20 fine stone concrete is used to fill and compact the block holes at fixed positions, etc., to facilitate expansion bolts or nails.
Since the coefficient of linear expansion of concrete small blocks is twice as high as that of red bricks, a joint expansion joint is provided for each of the two units to reduce the occurrence of temperature cracks.
7 Effect Analysis The Donghu residential quarters in Daqing City are all concrete small block benzene board composite wall houses with a total construction area of ​​207,072 m2, all of which have reached excellent standards and achieved good economic and social benefits.
(1) Concrete small block benzene board composite wall, breaking the traditional practice of using red brick wall, saving a lot of land resources and meeting the requirements of energy saving 5012.
Compared with the same size brick masonry building, the concrete small block composite wall reduces the weight of the shed by more than 40, reduces the basic structure, saves more than 50 mortars, improves the masonry work efficiency by 25, saves labor and materials and shortens the construction period.
Compared with ordinary brick masonry houses, the outer wall of concrete small block is 380mm thick and the inner wall is 190mm thick. It is 490mm smaller than the outer wall of ordinary brick masonry house and the inner wall is obviously smaller. It can increase the use area. 1 Wang Lijiu, 1945 Born in March, Changchun, Jilin, instructed by the School of Civil and Hydraulic Engineering, Dalian University of Technology, Ph.D. Supervisor, 116024 Dalian 2 Dalian University of Technology, School of Civil and Hydraulic Research Funding Project
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