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1、谈后浇带的设计与施工Abstract: the new release of code for design of concrete structures (GB 50010-2002, hereinafter referred to as the concrete specification), the reinforced concrete structure of the largest joint spacing requirements than the strict norms, norms used by the word may should be changed to . T
2、his requires in the structural design, the designer must be taken seriously due to long to structure the negative influence, when the distance increases or structural joints is no expansion joint, must take practical measures to prevent the cracks of the structure.Key words: post pouring belt; desig
3、n; constructionThe new release of code for design of concrete structures (GB 50010-2002, hereinafter referred to as the concrete specification), the reinforced concrete structure of the largest joint spacing requirements than the strict norms, norms used by the word may should be changed to . This r
4、equires in the structural design, the designer must be taken seriously due to long to structure the negative influence, when the distance increases or structural joints is no expansion joint, must take practical measures to prevent the cracks of the structure. In increasing the spacing of the larges
5、t joint measures, take prevention measures in construction stage is an effective method for the general concrete shrinkage reducing the adverse effects of our common approach is to set the construction of the pouring belt. In addition, when the building there is a big difference, but the structure d
6、esign according to the specific circumstances can not set up permanent deformation joints, such as high-level and multi-storey main building (or lower) between the podium, construction is often used after pouring to resolve the differences in the construction phase of the settlement. These two kinds
7、 of construction after pouring belt, the former can be called shrinkage after pouring belt, the latter can be called post settlement belt. In this paper, after the construction of the design and construction of pouring belt, combined with engineering practice, talk about the authors view.First, the
8、design of the back pouring beltWhen the plane size of the building structure exceeds the maximum spacing of the expansion joint specified in the concrete specification (concrete specification 9.1.1), the method of post construction pouring belt shall be taken into consideration to appropriately incr
9、ease the spacing of the expansion joint. But the general structure due to temperature changes greatly, so the largest joint spacing should not be more than the concrete specification limits too much at the same time, we should pay attention to strengthen the roof insulation, the external walls of th
10、e use of reliable and efficient heat preservation, and increasing the longitudinal reinforcement ratio of vertical wall, gable roof and other important parts of the. When the local structure is equipped with shock proof joints due to seismic design, the width of the expansion joint shall meet the re
11、quirements of the shock resistant seam width. The structure of super long basement is frequent, in addition to the basement roof and in the basement of the outdoor above ground wall affected by temperature change is relatively large, the basement and foundation of internal structure in the use stage
12、 affected by the change of temperature inside and outside the room, the main problems to solve is the concrete shrinkage stress influence on structure. Except in the construction stage of post pouring belt, should strengthen the reinforcement of the basement roof and exterior wall of basement, recom
13、mended minimum longitudinal reinforcement ratio of not less than 0.5% bar as far as possible to choose a smaller diameter, generally 10 to 16 can be, try to choose the close spacing, should not be greater than 150mm, fine and dense the distribution of reinforcement is favorable for structural crack.
14、It must be pointed out that.,The back pouring band can only solve the autogenous shrinkage of concrete during construction, and it can not solve the stress concentration caused by the change of temperature, and can not replace the expansion joint. It is wrong for some structural designers to equate
15、the back pouring strip with the expansion joint, since the effect is not the same.When the basement structure is too long and the back pouring belt is not enough to solve the concrete shrinkage and temperature variation, the shrinkage compensating concrete can be taken into consideration, and the ex
16、pansion reinforcing belt is arranged in an appropriate place. The method can not only increase the maximum spacing of the expansion joint, but also can replace the part of the construction after casting belt with the expansion strengthening belt, thus realizing the continuous pouring of the concrete, namely the seamless construction. It should be noted that the use of expansion reinforcing strip to replace part of the construction of the pouring be
