Double-layer roadbed box applicable to 3200t crawler crane and construction method of double-layer roadbed box

Abstract

The invention discloses a construction method of a double-layer roadbed box applicable to a 3200t crawler crane. The method comprises the steps of determining the position of each crawler when the 3200t crawler crane is operated, and defining an area of 11m*27m in the transverse and longitudinal center of the crawlers at each side; carrying out earth excavation according to a specified area, and digging a foundation pit of 1.5m; carrying out 3 to 7 lime soil backfilling in the foundation pit, wherein the backfilling depth is 0.8m, and the compactness is 95 percent; laying 200mm of stone on 3 to 7 lime soil, leveling, and detecting soil bearing capacity (reaching 30t / m<2>); laying a lower layer roadbed box according to the transverse and longitudinal central line of the crawler, ensuring the flatness deviation of the single-side roadbed box to be less than 2mm / m, and allowing the height deviation of the two side roadbed boxes within 10mm; and laying the upper layer roadbed box after the laying of the lower layer roadbed box conforms to the requirement. The invention also discloses the double-layer roadbed box applicable to the 3200t crawler crane. By adopting the construction method, a large intrinsic standoff ratio can be realized, the maximum load bearing capacity of the crawler crane is 288.4t / m<2>, and the application range is enlarged.

Description

technical field [0001] The invention belongs to the technical field of industrialized construction, and in particular relates to a double-layer subgrade box suitable for a 3200t crawler crane and a construction method thereof. Background technique [0002] With the enlargement of industrial installations, the hoisting of ultra-large equipment is the focus of project construction. At present, there are only three Terex 3200t crawler cranes in China, which are mainly used in the hoisting of nuclear island equipment modules in the nuclear power industry. Because the hoisting area of ​​the equipment is fixed, the range is large, and the load is still medium-sized, the site generally adopts tower working conditions. At this time, the pressure of the crawler crane on the foundation did not reach the design maximum value. According to the usual working conditions on site, the pressure of the crawler crane is 120t / m 2 , foundation pressure resistance 60t / m 2 As a basis, a crawle...

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Problems solved by technology

[0003] When the 3200t crawler crane is used to hoist large equipment in petrochemical plants, the maximum pressure on the foundation is 288.4t / m 2 , when the field is treated with a simple roadbed, the maximum ground endurance is 30t / m 2 At this time, the use of a simple single-layer subgrade box can no longer meet the requirements for the safe use of crawler cranes.

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