Sany SR420 helps the main bridge of Donglei Expressway Tongminghai Bridge to close smoothly

2019year6month30On the same day, the main bridge of Tongminghai Bridge, a control project of Donglei Expressway with the participation of Beijing Sany Intelligent Rotary Drilling Rig, was successfully closed, creating favorable conditions for the subsequent completion and opening to traffic.

The Tongminghai Bridge was built with the participation of Poly Growth Company, and its total length is about5762meters, the main bridge is a double-tower double-cable-stayed bridge, and the span is arranged146+338+146meters, the tower is about high121It is currently the longest double-tower cable-stayed bridge across the sea in western Guangdong. With the Tongminghai Bridge connecting the east and west, turning the moat into a thoroughfare, Leizhou and Donghai Island will be closely linked together to achieve common development.

The bridge site is located in the area frequently affected by typhoons, thunderstorms and tropical storms and the mangrove nature reserve, which is extremely difficult to construct. In order to overcome the impact of unfavorable environmental factors on the bridge and speed up the construction progress, the main pier pile foundation of the Tongminghai Bridge adopts a diameter of 2.8-3.1m bored pile, pile length138meters, the drilling platform to the bottom of the pile146m, the construction equipment uses rotary drilling rigs, but there is no precedent for such large-diameter ultra-deep piles in China.

In view of the particularity of this project, the Poly Long Project Department organized a special technical seminar and cooperated with Beijing Sany Intelligent Manufacturing Technology Co., Ltd. to manufacture it specifically for the project construction requirementsSR420Rotary drilling rigs. Beijing Sany Intelligent Manufacturing Technology Co., Ltd. rematches the construction capacity of the designed whole machine, and focuses on key research in terms of working height, main winch capacity, and stability of the whole machine, so as to ensure that the equipment can achieve safe construction and efficient construction under the condition of meeting the requirements of the project department. It is the close cooperation between the two sides that makes the process have the guarantee of equipment, and the fastest construction period of the main pier monopile is4.5day, in one fell swoop created the pile path2.8meters, the depth of the hole146m "the deepest ultra-long pile foundation in China" record.

At the same time, in order to avoid the impact of the typhoon period on the quality and progress of the project, the main pier cushion cap adopts the overall hoisting process of the casing box, which is only used38It's done in days1The construction of the cushion cap of Wanfang concrete has created the first speed of large-volume cushion cap construction in China, and also provided a strong guarantee for the smooth closure of the main bridge.

Beijing Sany Intelligent Manufacturing Technology Co., Ltd. is a high-tech enterprise specializing in R&D, manufacturing, sales and service of piling equipment under Sany Heavy IndustryC10、E10、H10andW10Four series of rotary drilling rigs can meet the needs of various pile hole construction. Three of themH10The series hasSR405R、SR415R、SR445RandSR485RThe four products, specially designed for large-hole deep piles, have the five characteristics of heavy load, high efficiency, energy saving, reliability and intelligence, and have strong rock-breaking ability and efficient construction efficiency, which is an indispensable construction tool for large-diameter ultra-deep pile foundation construction in China.