Plug-in type high-temperature-resistant ablation prefabricated part for flow guide groove of launching station and construction method of fire-resistant protective layer

Abstract

The invention discloses a plug-in type high-temperature-resistant ablation prefabricated part for a flow guide groove of a launching station and a construction method of a fire-resistant protective layer. The prefabricated part comprises a high-temperature-resistant ablation main body (1) prepared from a refractory castable, a vacancy structure (2) and an upper-and-lower two layer steel bar net (3) is arranged on the high-temperature-resistant ablation main body (1); the steel bar net (3) is composed of reinforced bars which are inlaid in the refractory castable and extend out of the refractory castable and are in a criss-cross mode; and the vacancy structure (2) is located between the upper-and-lower two layer steel bar net (3), and is composed of a groove (4) formed by the vacancy insidethe refractory castable. The prefabricated part is arranged at a certain part in the flow guide groove, the fire-resistant protective layer with an integrated structure is finished through the cast-in-place refractory castable at the periphery of the prefabricated part; and the prefabricated part and the method have the advantages that the prefabricated part used in the construction of the flow guide groove is strong in maintainability, high in environmental adaptability, and long in service life.

Description

technical field [0001] The invention belongs to the technical field of civil engineering, and in particular relates to the construction technology of a diversion channel for a rocket launch station, in particular to a construction method for a ready-to-install high-temperature ablation-resistant prefabricated part and a fire-resistant protective layer for a guide channel for a launch station. technical background [0002] The main function of the diversion groove at the launch station is to discharge the high-temperature and high-velocity plume generated by the booster ignition during rocket launch in the design direction, so as to ensure the normal operation of the rocket engine and eliminate its damage to surrounding facilities. At present, the main structure of the diversion tank is mostly reinforced concrete, and its working layer is a cast-in-place refractory reinforced concrete protective layer to resist the high temperature thermal shock during rocket launch. [0003]...

AI Technical Summary

Problems solved by technology

[0004] Poor maintainability: the diversion channel of the launching station adopts a cast-in-place integrated structure with internal reinforcement mesh, and the damage speed of each part varies greatly during use. The damage speed is the highest, and the advection section is basically not damaged due to the structural protective design, so it is necessary to repair the severely damaged local parts after several uses

Although the current overall cast-in-place structure has good integrity, it cannot be partially dismantled and repaired

[0005] Poor environmental adaptability: The construction environment of refractory castables belongs to the open air environment, and the construction performance and technical indicators of castables are greatly affected by environmental factors such as temperature and humidity. Although the construction performance of castables can be corrected by adding additive technology, but However, it is difficult to achieve the technical indicators in the standard testing environment, so that its performance cannot be guaranteed to the maximum extent.

[0006] Poor high-temperature ablation resistance: Since cast-in-place materials cannot be baked, the amount of cement added is usually fully increased in order to obtain high strength, and too high an amount of cement added will significantly reduce the refractoriness of the material, resulting in deterioration of its high-temperature performance

Compared with the baked refractory castables, the unbaked refractory castables have lower bonding strength and poorer erosion resistance

In addition, when the direct-flow section is impacted by high-temperature airflow, the crystal water in the cast-in-place refractory concrete will gasify rapidly, which will easily cause the material to burst and damage the structure. The structure is abnormally damaged and the service life does not meet the requirements.

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