New Technology in Building Construction _ On the Application of New Technology in Building Construction

With the development and improvement of the scale and quality of the construction industry, the level of China's construction technology is also constantly improving. On the basis of expounding the development of new construction technology, this paper analyzes the new construction technology from several common engineering technologies such as waterproof construction, mass concrete construction, steel bar connection, roof construction and emery wear-resistant floor, and puts forward the application of some new construction technologies, so as to provide certain reference for improving the efficiency and quality of construction projects.

With the rapid development of science and technology in China, the construction industry is also changing with each passing day. At present, the competition in the construction market is very fierce. In order to gain a foothold in the market and seek greater development, we must rely on scientific and technological innovation to enhance the strength of enterprises and ensure that the key construction technology and equipment keep up with the international development trend and the advanced level of the industry. Improve scientific and technological content, improve engineering quality, reduce production costs and create the best benefits. Although in recent years, with the development and improvement of the scale and quality of the construction industry, the level of China's construction technology is constantly improving, especially some individual technologies have become among the world's advanced ranks. However, on the whole, China's construction technology level is relatively low at present, and the construction industry as a traditional labor-intensive industry and the growth mode of extensive economic have not been fundamentally changed. The only way to speed up the transformation of scientific and technological achievements in the field of construction engineering, continuously improve the scientific and technological content of engineering projects, comprehensively promote the technological progress of construction enterprises and improve the overall level of construction technology is to rely on scientific and technological progress and apply scientific management and a large number of technologically advanced and reliable scientific and technological achievements to various fields of engineering projects and construction industry.

The development of new building technology With the continuous improvement of China's scientific and technological level, the level of building construction technology has also been quite mature and steadily improved. Especially in recent years, the emerging new technologies and new processes in building engineering have brought great impact to the traditional construction technology. The emergence of this series of new technologies not only solved the technical bottleneck that traditional construction technology could not achieve in the past, but also promoted and guided the emergence of new construction equipment and construction technology. In addition, the new construction technology has improved the construction efficiency as never before. On the one hand, it reduces the cost and working time of the project, on the other hand, it enhances the safety and reliability of the project construction, providing a broader stage for the development of the whole construction project. At present, the Ministry of Construction focuses on promoting ten new technologies in the construction industry, including deep foundation pit support technology, high-strength and high-performance concrete technology, high-efficiency steel bar and prestressed concrete technology, large-diameter steel bar connection technology, new formwork and scaffolding application technology, building energy-saving and new wall application technology, new building waterproof and plastic pipe application technology, steel structure technology, integral installation technology of large components and equipment, and enterprise computer application and management technology.

Application of new construction technology in concrete projects. 1 waterproof construction technology waterproof is actually to prevent leakage and harmful cracks in the parts that contact with water.

We must follow the correct design principles. Comprehensive treatment, multi-channel fortification, rigid-flexible combination, waterproof and drainage, composite waterproofing, comprehensive fortification, joint sealing, reasonable selection of waterproof materials and construction technology.

For roof waterproofing, this paper puts forward a relatively new construction technology, that is, polymer cement-based composite coating construction: this construction technology first deals with slab joints, joints and base. During the construction of tower roof and podium roof, the coating should be carried out in stages, and the coating should be dried before coating. The laying directions are perpendicular to each other, and the thickness of the topmost coating is not less than1mm. The end of the coated waterproof layer should be coated with waterproof coating for many times, and there can be no flowing and accumulation. The waterproof layer reflects many walls.

Aerated concrete brick wall should be used for external wall waterproofing, that is, in order to prevent the plastering layer from cracking and hollowing, steel wire mesh should be hung at the interface of two different materials before plastering the aerated concrete block wall. After the steel mesh is fixed, the base surface is treated, and 20% 108 glue and L5% cement are used to prepare cement slurry for brushing. After the surface treatment at the grass-roots level, the plastering layer should be constructed. Dry bricks or bricks soaked in water are strictly prohibited during masonry, and water shall not be used for masonry. Thickness of horizontal mortar joint and width of vertical mortar joint shall be controlled within the range of10 2mm, and mortar plumpness of horizontal mortar joint shall be ≥ 8o%. Generally, it is built to the top in three times, and reinforced concrete lintels are used. In the subsequent waterproof layer construction, the water-based ultra-low pollution fluorine coating (double-liquid antifouling type) was painted on the leveling layer in a cross shape with a thickness of 3mm, and sprayed with water in time after construction.

Mass concrete construction is complicated for mass concrete rotation and mass concrete construction, because the hydration of cement in concrete is an exothermic reaction. When the temperature stress exceeds the tensile limit that concrete can bear, cracks will appear in concrete. It is the key problem of construction technology to control the temperature rise of concrete pouring block, the temperature difference between inside and outside of concrete pouring block and the cooling speed caused by cement hydration heat, and to prevent harmful temperature cracks (including concrete shrinkage cracks) in concrete.

According to the specific situation and temperature stress calculation, it is determined whether to cast in whole or in sections. Then, according to the determined construction scheme, the number of concrete transportation tools, pouring equipment, tamping machinery and labor force is calculated. Common pouring methods are concrete pump pouring or tower crane pouring. Concrete pouring should be carried out in reasonable sections and layers, so that the concrete will rise evenly along the height. Pouring should be carried out when the outdoor temperature is low, and the temperature when pouring concrete should not exceed.

After mass concrete is poured in sections, the surface shall be vibrated or plastered after initial setting and before final setting, so as to eliminate bleeding on the upper surface, and plastered and compacted repeatedly with wooden swatter to eliminate the first surface crack. Under winter construction conditions, the compacted concrete should be covered with plastic film in time, and then covered with thermal insulation materials (rock wool quilt, grass curtain, etc.). ). In non-winter construction conditions, plastic film and thermal insulation materials can be covered, or after the final setting of concrete, embankment can be built around the upper surface of concrete, and water with a depth of 20-30cm can be poured for maintenance. And regularly measure the surface and internal temperature of concrete.

When curing concrete in humid environment, the concrete mixed with portland cement, ordinary portland cement or slag portland cement shall not be less than 7 days, and the concrete mixed with retarding admixture or with impermeability requirements shall not be less than 7 days.

There are some problems that need to be standardized in the construction of steel bar connection, such as mechanical connection, area percentage of welded joints, etc., which should not be controlled according to tensile zone. When the number of steel bars is odd, it is acceptable to slightly exceed the percentage. There is no limit to the compression area, otherwise? 1 quo: The punishment scale is too strict. Percentage control of binding joint area: the tensile reinforcement of beam, plate and wall should not be too large. When it is really necessary to increase the percentage of joint area in the project, the tensile reinforcement of the beam should not be greater than 5O, and other components can be appropriately relaxed according to the actual situation. Therefore, the percentage of joint area of tensile reinforcement in the beam is a bottom line, which cannot be crossed, and other members can be relaxed, but the requirements of lap length must be met. Such as column reinforcement (especially constructional column), lap joint can also be set up, which will facilitate construction.

At present, there is a new type of steel bar connection, that is, straight thread joint connection: there are three different forms of straight thread joint connection.

For the straight thread connection of steel bars, when connecting standard joints in concrete construction, first screw the steel bar at one end of the installed connecting sleeve onto the connected steel bar. Make the exposed threads of the sleeve not exceed 1 complete threads, and the connection is completed. Thread-adding joint: firstly, screw the lock nut and standard sleeve on the first steel bar of the lengthened thread head in turn, then tighten the standard thread head to be reinforced, then screw the sleeve back to the standard thread head and tighten it with a wrench, then tighten the lock nut and the standard sleeve for locking connection, and the joint inspection is completed. After the joint connection is completed, the quality inspector will check it in batches. The inspection method is as follows: the exposed threads at both ends of the joint are visually equal in length, and the complete threads (except extended threads) do not exceed 1 piece, and every 300 joints ~ pieces, each batch 1 piece, and 65,438+0,000% of the rebar connection requirements are qualified.

Roofing project The main link of roofing project should belong to roofing waterproof construction, which usually adopts traditional waterproofing membrane, including asphalt waterproofing membrane, polymer modified asphalt waterproofing membrane and synthetic polymer waterproofing membrane. The leading varieties of waterproofing membrane are polymer modified asphalt waterproofing membrane and polymer waterproofing membrane. Conclusion With the continuous progress and development of society, there will be more new technologies, new equipment and new materials. We should be brave in innovation, bold in application, and combine modern scientific management to achieve good results in construction and production. At the same time, in order to continuously promote the technological progress of the construction industry and increase the promotion of advanced and applicable new technologies in the construction industry, the content of new technologies in the construction industry should also be adjusted and supplemented to continuously adapt to the new requirements of the development of productive forces and realize the sustainable development of enterprises.