On August 16, in the project of improving the safety capability of traffic safety facilities of G60 Shanghai-Kunming Expressway and G75 Lanhai Expressway in Longli County, a "giant craftsman"-slipform paver was moving slowly on the central isolation belt of the road, where the paver passed, a new type of low-reinforced concrete anti-collision guardrail was formed. The first phase of the project is constructed by Hengchuang Construction Company of Guiyang Chengfa Group, which belongs to Guizhou High Speed Group. This is also the first application of the "slipform" construction technology of low-reinforced concrete guardrail in Guizhou Province. It has many advantages, such as low cost, short construction period and high safety. The
driver praised
Mr. Ren of Guiyang, who works in Longli County and often needs to go back and forth between the two places. Since the project of improving the safety capability of traffic safety facilities was launched in mid-May 2023, Mr. Ren has seen significant progress in the project every few days. "There is a mixer truck on the isolation belt, followed by a large machine, observed every day only to find that the original quarantine guardrail is made by it." The
traditional "turnover formwork" construction is inefficient, which can only advance about 60 meters per day, but the "slipform" construction can advance 200-300 meters per day, which greatly reduces the construction time of the central isolation belt as long as 28 kilometers. Lu Jiangdong, project manager
of Hengchuang Construction Company Bid 7, introduced that the construction of "slipform" mainly depends on the cooperation of concrete mixer, paver and workers. Among them, the paver is the "main force". The concrete is vibrated and formed by the vibrator in the mould of the slip-form machine. The concrete moves forward while vibrating and vibrates while driving. The driving speed is controlled according to the speed of material supply and the pouring effect. The concrete reaches a dense state within the duration of propulsion. The guardrail is formed at one time, which can realize "building while walking" and save about 10% of the cost per cubic meter.
The development of "exclusive" concrete greatly improves
the safety factor on the traditional highway, the central isolation belt mostly uses metal waveform guardrail, in case of traffic accidents, metal waveform guardrail has the risk of intruding into the vehicle passenger compartment. At the same time, the maintenance unit needs to replace the damaged waveform guardrail, resulting in secondary road-occupying construction.
Lu Jiangdong introduced that slip-form construction has extremely high requirements for raw materials, mix proportion and transportation conditions of semi-finished products. Hengchuang Construction Company relies on the company's scientific research platform to carry out scientific research work according to the project situation. Through independent development of slip-form construction concrete, repeated research and test, the "exclusive" concrete for slip-form construction is finally developed.
Professional crash tests have proved that "exclusive" concrete can withstand the impact of general traffic accidents and greatly reduce the risk of secondary injury to drivers and passengers. As the "main force" of
the paver, the workers call it "easy"
. The traditional formwork turnover construction site has great potential safety hazards. The formwork weighs 800 kilograms. A team needs about 16 people, and this "Jack stone" needs a crane to cooperate with the workers on the site to lift it by hand. At the end of the day's work, the workers shouted, "I can't lift my hands.".
Slipform construction can effectively reduce the risk of accidents and reduce the potential danger of workers caused by suspension operation by controlling the pouring of concrete through the computer system and sensing system equipped with slipform paver.
Not only that, the slip-form construction team only needs about 8 people, and greatly reduces the time of carrying heavy objects. Li Youhong, the team leader of Bid 7 Project, has been engaged in highway construction for more than ten years, has participated in the construction of Huaxi Avenue and other projects, and is an expert in traditional turnover construction. When asked about the feeling of using slip-form construction for the first time, Li Youhong said bluntly: "It's much easier!"
It is understood that G60 Shanghai-Kunming Expressway and G75 Lanhai Expressway are important components of the skeleton highway network in Guizhou Province. At present, the project of improving the safety capability of traffic safety facilities in this section has entered the sprint stage, and the renovation is expected to be completed by the end of September.
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