The thermal insulation masonry cast-in-place bearing wall system is a new type of thermal insulation load-bearing structure, which first appeared in Europe and the United States. After the introduction of the building technology into China, it was valued by the construction industry. The thermal insulation masonry cast-in-place bearing wall system is constructed by the factory to produce the thermal insulation hollow block into a wall body, and the vertical and horizontal steel bars are arranged in the holes of the block, and then the large flow and vibration-free concrete is poured. During construction, the pet block acts as a template (concrete concrete in the hole). After the wall is built, the block acts as a wall insulation. The reticular concrete stems and beams are subjected to various loads like concrete walls. Use this system. The construction cost is low and the construction progress is fast. Although the concrete is poured on site, there is no need to support the steel formwork, and the wall insulation performance is good, which meets the requirements of building energy conservation. At present, the cast-in-place bearing wall system for thermal insulation is mainly used in multi-storey residential buildings. This technology is similar to traditional construction methods and is easily accepted by people.
1Insulation hollow block and thermal insulation masonry cast-in-place bearing wall main technical indicators Beijing Yili Building Materials Co., Ltd. EPS concrete (polyphenyl granule concrete) thermal insulation hollow block is broken with waste polystyrene foam into particles as light bone Material, cement is used as a cement, and additives such as binders are added to the concrete. At present, there are three kinds of specifications for the thermal insulation hollow pet block. The outer dimensions are 400mm wide and 200mm high. The thickness is also selected as a pet block of different thickness according to the inner and outer walls. The density of the pet block is 400~500kg3. The vertical hole and the horizontal groove of the pet block are square, and the size of the hole and the groove in the block can be changed according to the design requirements of the poured concrete core.
The block, which doubles as the inner and outer insulation layers of the outer wall, can avoid thermal bridges, reduce energy consumption, and has a thermal conductivity. The heat transfer coefficient of the 9~11, 30cm masonry exterior wall is 0.60, and the 25cm thick masonry exterior wall is transmitted to meet the 50% energy saving requirement in Beijing. The heat transfer coefficient of the 40cm thick masonry exterior wall is 0.40 (W/fe2.k), which can meet the building insulation needs in Harbin. The heat storage coefficient of the thermal insulation masonry material is 187 (WAi2k), the thermal inertia index D value of the 30cm thick external wall is 399, and the D value of the external wall of the 25cm thick wall is 321, which all meet or exceed the D value of the ordinary clay brick wall of 24cm thick (3.14). ). The exterior wall of the thermal insulation moulding is in line with the winter and summer cool of the house, which fully meets the development requirements of the ecological building, and is incomparable to other wall practices.
In addition, the 20cm thick inner wall, the core is 12cm thick reinforced concrete, the sides are EPS concrete, constitute a composite structure, with good sound insulation performance of 50dB, to meet the air insulation standard of the first-class air of residential building wall.
EPS concrete used for thermal insulation molding, when the density exceeds 350k n1, the German specification is judged to be quasi-combustible material, belonging to A2 grade. EPS concrete does not burn or spread in high temperature (1000 or more). After the surface polystyrene particles are melted, cement foam is formed and there is still heat insulation.
The 20cm thermal insulation moulding cast-in-place concrete wall has a fire resistance limit of up to 4 hours and can meet the requirements of the firewall.
2 Construction of the thermal insulation masonry cast-in-place bearing wall The construction of the cast-in-place bearing wall system is a combination of masonry engineering and reinforced concrete engineering. The masonry construction is a masonry process, which is flexible and simple in construction. The masonry crevice is small, and it is built with polymer mortar. The masonry height can reach 3.4m. The overall stability of the wall is very good. It does not need any of the several wall construction methods of Table 1. The comprehensive cost comparison wall type construction method artificial material fee Yuanru 2 ratio exterior wall interior wall interior and exterior wall combination exterior wall interior wall interior and exterior wall combination masonry bearing wall 300 thick thermal insulation masonry outside bearing wall bearing wall 190 thick block insulation outside bearing wall bearing wall 140 thick cast-in-place load-bearing insulation wall 140 thick cast-in-place inner load-bearing wall 243.37128.00174.151.471.041.25 Note: At present, the new type of residential building is included in the floor area per square meter. 4m2 external wall, support, can directly and continuously inject large flow concrete, which is currently impossible to achieve in the integrated construction system of template insulation at home and abroad. The specific T. process is as follows: According to the hole position of the wall insulation hollow block, the concrete core anchor is pre-buried on the grounded concrete foundation. The wall is built with insulated hollow blocks, which are staggered according to the length of the half block, and the horizontal reinforcement is provided along with the building. After the wall of each floor is finished, the vertical steel bars are inserted, and the steel bars are accommodated in the cavity through which the walls penetrate each other, and the floor ash in the hollow hole below the wall is cleaned, and the vertical steel bars are passed through the cleaning port. The concrete core anchors are tied and connected, and the upper part of the vertical reinforcing bars is connected with the ring beam reinforcement. After the floor insulation hollow mold wall is built, the door and window openings and the horizontal holes of the wall are blocked, and the self-compacting, micro-expanded fluid concrete is poured from the top of the vertical cavity, and the concrete is hardened and inside the wall. Form a grid-like reinforced concrete load-bearing structure.
(4) According to the hole position of the upper wall, the upper wall block anchor column rib is pre-buried on the ring beam. After the cast-in-place beam and the lintel are cast-in-place, the concrete strength is up to the required installation or cast-in-place floor.
(6) The main structure of the thermal insulation masonry load-bearing wall building is completed, the surface of the wall should be decorated, the surface is scraped with polymer mortar and then affixed with glass cloth, then the polymer mortar is used for leveling and calendering, and the external spray coating or decorative facing brick is solidified. .
3 Effect and Advantages of Insulation Masonry Cast-in-place Bearing Wall System The concrete core of the cast-in-place bearing wall is a grid-like reinforced concrete structure with good integrity. Compared with the wall of the general carcass structure, the seismic performance is greatly improved. improve. Through the simulation calculation and the analysis of the structural performance test results of Tsinghua University, it can be seen that the multi-storey (including seven-story) concrete mesh shear wall is configured with steel bars according to the force, and the buildings below four floors are structurally reinforced. The external wall concrete mesh shear wall has a structural thickness of 15cm, a hole of 20%, and a folded thickness of 12cm. The inner wall mesh shear wall has a structural thickness of 12cm, the hole accounts for 20%, the folded thickness is 10cm, and the mesh wall is at the axis. Under the joint action of pressure and reciprocating horizontal force, the failure mode is the shear failure of the coupling beam and the concrete of the end wall limb is damaged by the pressure, the crack is dispersed, and the ductility is good. The ultimate displacement angle is greater than M00 and the ductility coefficient is greater than 3. The reinforcing column of the wall can effectively improve the shear capacity of the wall, but the reinforcing column has little effect on the deformation ability of the mesh wall with shear deformation. In addition, the thermal insulation masonry cast-in-place bearing wall can be combined with other structural walls, and the concrete small hollow block load-bearing inner wall is combined into an “external pouring inner†thermal insulation load-bearing system, which can avoid easy cracking and leakage of the external wall of the block. And improve the overall seismic performance; combined with the cast-in-place concrete inner wall into a thermal insulation full cast-in-place bearing system, external wall insulation mold protection structure, reduce temperature stress, prevent cracks, is conducive to the expansion of the expansion joint spacing.
The block dimensions are consistent with the standard modulus of a conventional hollow block.
The structure and appearance dimensions are suitable for factory production and can be automated and semi-automated for specialized production. The hollow hollow pet block has light weight and convenient construction, and is easy to be built on the construction site. The vertical and horizontal reinforcement is simple and easy. The poured concrete has sufficient strength to meet the load-bearing needs of multi-storey or high-rise buildings. The reinforced concrete core bearing the external wall is not exposed at all. The temperature change in winter and summer is small, and the temperature stress damage is reduced, which is beneficial to the protection of the load-bearing wall structure. The heat-insulating mold-bearing wall has no separate insulation layer. The core does not need a template, and the load-bearing insulation is integrated, so the construction period can be shortened and the cost can be reduced. It can replace clay bricks and use waste polystyrene foam as raw material to reduce environmental pollution and benefit the old. It is in line with the national policy of wall reform, building energy conservation and environmental protection.
Through comprehensive analysis, the cost of wall construction using thermal insulation masonry construction is lower than the current price of wall and insulation layer construction. See Table 1. 4 Conclusions Insulation Masonry Cast-in-place bearing wall system is a kind of insulation, heat insulation and separation. The new structure of sound, fire prevention and structural integration is innovative in technology and meets the needs of China's building energy conservation, wall reform and environmental protection. Especially in the construction of multi-storey residential buildings in the northern region, it has obvious economic and social benefits.
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