Method for jacking large-sized prefabricated parts

Abstract

The invention discloses a method for jacking large-sized prefabricated parts, which is characterized by including: setting air sacs, erecting a jacking base, laying a bottom plate, prefabricating a part, jacking and removing the air sacs. The method has the advantages that building cost of a prefabricating site is reduced, load of the prefabricating site is small, jacking stability is high, service cost is low, safety is high, inflating speed is fast, and use is flexible and convenient. The flat air sacs are all set below the part and less prone to damage, specifications, layout, delivery and the like of the prefabricated parts are no longer limited by positions of air sac grooves or hydraulic jacks, labor and time are saved, the air sacs can directly pass through rolling air sacs from the bottom of the part after jacking the part, and no support cushion is needed.

Description

technical field [0001] The invention relates to the field of object lifting, in particular to a jacking method for large prefabricated components. Background technique [0002] The jacking of current large prefabricated components is generally realized by hydraulic jacks or mechanical jacks. In modern construction, the volume and weight of components are getting larger and larger, such as caissons for ports, intake and drainage outlets of power stations, box culverts, bridges, immersed tubes, ships, drilling platforms, etc., these components weigh thousands of tons or even over If the traditional jacking method is used, several jacking points must be arranged. Since the load at the jacking point is very concentrated, the load per square meter must reach hundreds of tons, which requires high foundations, especially geological In areas with poor conditions, the construction is difficult, the cost is high, the efficiency is low, and the safety is poor. Large-scale prefabricati...

AI Technical Summary

Problems solved by technology

[0004] 1) The construction cost of the prefabrication field is relatively high, especially for the prefabrication field with poor geological conditions, the foundation of the airbag tank needs special treatment, and the construction cost is high;

[0005] 2) The strength of the cover plate of the airbag groove is high, and the bearing capacity per square meter is as high as 30 tons or more. Not only is the cost high, but it is also easy to damage. , the flatness of the cover plate becomes poor or damaged, and the airbag groove will settle. When it is used again, the prefabricated site needs to be leveled with sand, and the cover plate needs to be replaced frequently;

[0007] 4) The working height of the airbag is high, and its height is the depth of the airbag groove plus the height of the component base from the prefabricated platform. The deeper the airbag groove, the smaller the contact area between the airbag and the bottom surface of the component, and the greater the working pressure required for the airbag , the load at the bottom of the airbag groove is greater, and there is also the problem of unstable lifting of the airbag;

[0008] 5) When the specifications of prefabricated components are changed, it is often restricted by the layout of the airbag grooves in the prefabricated site, and the utilization rate of the site will be reduced, which will bring difficulties to the simultaneous prefabricated layout and shipment of multiple components. Although this solution is better than the hydraulic jack The lifting is much better, and it is not necessary to reset the jacking pit seat for each specification of prefabricated components, but this problem cannot be ignored;

[0009] 6) This technical solution uses cylindrical airbags with conical heads at both ends. The conical heads are exposed to the outside of the component and are vulnerable to damage. This part requires a lot of gas but does not work, which is both gas-intensive and labor-intensive. unsafe;

[0010] 7) Supporting components are required. After lifting the airbag to lift the component to a specified height, a large number of cushioning objects must be placed under the component to support the component. Penetrate the rolling airbag at the bottom, which is labor-intensive and time-consuming

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