Le type of bridge expansion joint replacement woo

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Wool-type expansion joints of bridge replacement construction of Le

2.2 The layout of the support structure 1 YF-24 Type Concrete using quick repair agent, Dura fiber (DURAFIBER) concrete (1) material characteristics. I) YF-24 Type Concrete sulphoaluminate rapid repair agent by the majority of materials, high-quality materials and efficient silicon compound from the surface hardening agent. YF-24 Type Concrete's initial setting time of 2h10min, final setting time was 3h30min, initial setting time longer than ordinary concrete and final setting time shorter than that of ordinary concrete. YF-24 Fast repair agent for a cement content by I4% ~ 18% mixed concrete Concrete Aggregates can increase the bending strength of about 6%, compressive strength increased by 2. O% ~ 2.5%, this feature exists to solve the concrete construction of common operational and early strength development of contradictions. 2) Dura fiber (DURAFIBER) Hill Brothers Chemical Company in the United States produced its Dura fibers as thin as a hair, has a high strength, corrosion resistance and dispersed with water to the distribution characteristics of chaos, when mixed with Dura filaments Cement Concrete Aggregates strong bond with the formation of network enhancement system, when the concrete by the impact load when the fibers absorb a large amount of energy, thus effectively reducing the concentration of stress, hindered the development of concrete cracks and greatly improved Concrete impact, anti-fatigue, anti-shrinkage pulp ...-1IIIllf1 ... I Ⅲ engineering design and construction of 35 No. 4 performance. Dura fiber cement content by 0.36% to 0.3% of a mixed Concrete Aggregates Concrete flexural strength can increase by 10% to 15%, compressive strength of 2.5% a 3.5% increase. (2) doped YF-24 Type Concrete Concrete rapid repair agent, Dura fiber (DURAFIBER) concrete, mixed with YF-24 Type Concrete rapid repair agent and Dura fiber (DURAFIBER) concrete and ordinary concrete of the mechanical effect of Table 1, Aggregate concrete mix design in Table 2, Table 1YF a 24-type concrete, fiber reinforced concrete and concrete strength bud through MPa1) specimens in the table creation process is: 1,1 +2,1 +3,1 +4, respectively, the production of 4 and 4 strength flexural strength specimens, the intensity values in the table is based on the same slot in 4 batches of concrete aggregate total of 32 sets out the results of test specimens; 2) +% values are the corresponding normal the percentage of concrete strength in Table 2 Concrete Aggregates wool mix design in Table 3 Le expansion joint construction technology points (1) kerf slot. Subject to expansion joint centerline, on both sides of the resection 4O50cm range, cutting the old and the bridge deck pavement and expansion joints, the cutting depth should ensure that the minimum structure except the thickness is greater than or equal to 10cm, chiseled good beam roof and back wall top surface should be roughly flat and clean rinse. (2) the installation of expansion joint in place. Bridge expansion joints will be in place aimed at expansion joints, expansion joints to the center line of deck elevation and subject to, the elevation of straight, vertical and horizontal axis adjustment, smoothness adjustment. After positioning in strict accordance with the requirements of welded steel net 2.1, strengthening reliable and cut off only after passing inspection device positioning steel. (3) folder with 3mm plywood and foam expansion joint beam filling gaps and cracks sealed with glass, plastic construction to prevent leakage of concrete slurry. (4) casting a 24-type doped YF rapid repair agent and Dura fiber (DURAFIBER) concrete. L-3 in the above procedure after passing inspection, the bridge deck pavement layer of 3cm × 3cm at the bottom of the square hole wire mesh for concrete cracking strengthened, and in strict accordance with the design of the concrete aggregate mix mixing concrete, At the same time should do a good job and the flatness of vibrated concrete of the quality control, and to do a good job keeping in good health after the concrete forming work. 4 Conclusion In the Anglo-German line of State Road 106 bridge to the large and medium wool Le Fogang section of expansion joint replacement construction practice, we use this construction technique enhances the back wall - a main beam joints overall force performance, increase concrete tensile, flexural, impact, crack resistance and durability. At present, the line has been opened after the expansion joint replacement more than two years, the use of results are quite satisfactory. Mixed with 17% of the YF-24 Fast for a repair agent and 0.3% of the Dura fiber (DU-RAFIBER) joints per meter increased by only 20 yuan less than the project costs are marginal compared with the cost of expansion joints, and the construction is very simple and easy to operate. The overall economic effect is a good and worthy of promotion and application of construction technology. Port References: [1] JTJ041-2000, Specification for Highway Bridge Construction Is]. [2] China Engineering Construction Standardization Association. Steel fiber concrete structure design and construction of [M]. Beijing: China Construction Industry Press, 1992. [3] Ministry of the First Highway Engineering Corporation. A bridge highway construction manual [M]. Beijing: China Communications Press, 2000.
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