Assembly method of lightweight solid web mandrel applied to cast-in-place concrete hollow floor slabs

Abstract

The invention discloses a lightweight solid-web type mandrel applied to a cast-in-situ concrete hollow floor slab, and an assembling method of the mandrel. The lightweight solid-web type mandrel comprises a solid lightweight foamed inner core; a protective layer wraps outside the solid lightweight foamed inner core; the solid lightweight foamed inner core is provided with a feeding hole; an opening is formed in the protective layer by corresponding to the feeding hole. The assembling method comprises the steps of molding the solid lightweight foamed inner core, manufacturing the protective layer, putting the solid lightweight foamed inner core into the protective layer from the opening, and sealing the protective layer. After the assembling method is adopted, the mandrel can be rapidly assembled, the construction efficiency is improved, the rigid damage and the impact damage caused in a construction process can be favorably resisted, the phenomena of excessive pouring and water seepage of the concrete can be prevented, and the common quality problems of honeycombs and holes can be effectively avoided.

Description

technical field [0001] The present invention relates to mandrels for use in hollow-core slabs. Background technique [0002] In the past, most of the buildings in our country were reinforced concrete structures. This kind of structure consumes a lot of building materials and is heavy. Especially for the floor slab, the middle part is generally suspended, so the strength of the floor slab is low. For this reason, the country advocates the use of cast-in-place hollow slab technology to realize the construction of the slab. In this way, not only can the consumption materials be reduced, but also the weight of the slab can be reduced. [0003] At present, the technology of adopting cast-in-place hollow-core slabs is mainly as follows: first build the formwork, then lay the lower steel bars on the formwork, fix the mandrel on the lower steel bars, then set the upper steel bars on the mandrel, and finally pour concrete. [0004] However, most of the existing mandrels are hollow s...

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Problems solved by technology

[0004] However, most of the existing mandrels are hollow structures. For example, in the patent document whose publication date is 2005.7.27, the application number 200510020286.0 discloses a method for making and constructing a cast-in-place reinforced concrete hollow floor. The mandrel can be inflated and exhausted, that is, when pouring concrete, the mandrel is inflated, and when the construction is completed, the gas in the mandrel is released and the mandrel is pulled out. Although this structure can reduce the weight of the floor, when due to After the mandrel is inflated, it is a hollow structure. When pouring concrete, once the mandrel is damaged, the construction personnel cannot quickly find it, and the concrete will enter the mandrel, resulting in the phenomenon of concrete overfilling. The mandrel of this structure has poor resistance to rigid damage and impact damage caused by construction; in addition, when pouring concrete, it needs to be vibrated in order to discharge the gas and prevent hollowing, but this mandrel prevents construction workers from Observe the vibration situation in time, therefore, it is easy to form holes, and it is easy to form honeycomb and hole-type floors, making it difficult for the floors to meet the construction requirements

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