Fabricated concrete building grouting pretreatment construction method

Abstract

The invention discloses a fabricated concrete building grouting pretreatment construction method. The fabricated concrete building grouting pretreatment construction method comprises, after fabricatedpart hoisting and fixing as well as fabricated part and bottom plate edge sealing are completed and before grouting construction is implemented, detecting the blocking conditions of fabricated partsby filling vapor in through an ultrasonic atomizer, and then performing wetting treatment on a surface to be grouted, wherein the wetting treatment comprises the following steps of S1, continuously filling in vapor via a grouting inlet in the middle of the bottom of every fabricated part, when the vapor is emitted via a grouting outlet, blocking the grouting outlet through a rubber plug, standingfor a certain while and stopping vapor filling; S2, standing the fabricated parts for a while, detecting the moisture condition at the bottoms of the outlet holes at both ends of every communicating cavity through an endoscope to determine whether refilling vapor is necessary. The fabricated concrete building grouting pretreatment construction method is simple in operation and capable of effectively examining blocking and edge sealing conditions and adjusting the humidity and temperature of the communicating cavities in grouting areas to ensure grouting effects as well as connecting quality ofthe fabricated parts and improving the construction efficiency.

Description

technical field [0001] The invention belongs to the technical field of engineering construction, and in particular relates to a pretreatment construction method for prefabricated concrete building grouting. Background technique [0002] At present, prefabricated concrete structures have become the trend of future architectural development, and the country has issued technical regulations for the application of prefabricated concrete buildings, evaluation standards for prefabricated buildings and related national standard atlases. With the improvement of the acceptance of prefabricated concrete structures from all walks of life, the steel sleeve grouting connection technology has been more and more widely used. During the grouting construction process, the quality of grouting has a crucial impact on the quality and safety of engineering structures. How to wet the connecting cavity between the prefabricated components and the base plate before grouting directly restricts the g...

AI Technical Summary

Problems solved by technology

[0003] After the prefabricated components are hoisted and placed outdoors in a dry or high-temperature environment, if there is no prefabricated component and the connecting cavity for wetting before grouting, and the grouting is performed directly, the moisture in the grouting material will be absorbed by the concrete base surface, and the resistance of grouting It will become bigger and bigger, the water in the slurry will be lost quickly, the grouting pressure will be higher and higher, and the requirements for edge sealing will be higher and higher. The phenomenon of pipe plugging and edge sealing material cracking will easily occur on site, which will bring great harm to the construction site. Great inconvenience; greater risk of underfill grout

If the open water is injected directly through the grout hole for wetting, the lower surface and top surface of the prefabricated component cannot be effectively wetted. Since the base surface is generally roughened, there will be water remaining in the groove. Grouting may cause segregation and stratification of the grout, seriously affecting the quality of the grouting material, and the use of open water wetting will cause a lot of waste of water resources, which is contrary to the concept of green construction of green building materials in prefabricated buildings

[0004] Chinese patent CN105804410A discloses a method of sub-compartment pressure grouting for vertical connection of prefabricated concrete structures. The inventive method makes the grout overcome its own gravity and friction with the columnar pouring cavity to overflow the entire space from bottom to top through pressure. Grouting cavity ensures the density of grouting; according to the grouting height, the independent warehouse area is reasonably arranged to carry out grouting in different areas, which can improve the efficiency of grouting construction, but the invention uses the method of watering the grouting surface before grouting If it is wet, a lot of water resources will be wasted, and there may be water on the surface of the grouting pipes and prefabricated components, which will affect the quality of grouting

[0005] In addition, due to the uneven technical level of the existing component factories, it is very common for the inlet and outlet of the construction site to be blocked, and the corrugated pipes in some prefabricated components are seriously bent. The method of plugging and pounding iron wires is generally used to detect the blockage on the construction site. When the corrugated pipe is seriously bent, it is impossible to accurately detect whether the corrugated pipe is blocked. This method is relatively rough and the accuracy is poor, which is prone to misjudgment. For emergency dredging of pipelines, it is even necessary to chisel off the edge sealing layer of the base, wash the grouting material inside the prefabricated components, and then reinstall the edge sealing, which brings great trouble to the site construction and delays the construction period

[0006] According to the JGJ355-2015 technical specification for the application of steel sleeve grouting connection, the sleeve grouting construction should generally be carried out under the condition that the ambient temperature is not lower than 5°C, but affected by the temperature and the progress of the construction period, the actual project can be used below 5°C Low-temperature sleeve grouting materials put forward demand In order to meet the needs of low-temperature construction, a large number of scientific research and production units have developed low-temperature sleeve grouting materials one after another. However, when such products are grouted under low-temperature conditions, it is generally necessary to ensure that the diagonal support is fixed. The time is more than 24 hours, and it is supplemented by pre-curing, electric auxiliary heat preservation and other supporting maintenance measures. These measures increase the construction cost, complicate the grouting construction, and cannot perform humidification on the floor

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