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china latest news about There is water in the pit. Can we pour concrete?

There is water in the pit. Can we pour concrete?

October 17, 2025

To address this question, we must first determine whether water accumulation in the foundation pit affects concrete quality. According to Article 7.5.2 of GB/T14902 "Ready-Mix Concrete" standard: Concrete mixer trucks must completely drain water from mixing tanks before loading, and it is strictly ...
china latest news about Comparative analysis of rotary drilling rig with impact and rotary drilling rig

Comparative analysis of rotary drilling rig with impact and rotary drilling rig

September 17, 2025

The rotary drilling rig, a hole-forming equipment gaining widespread acceptance in recent years, has become a widely recognized method in underground foundation construction. As the fastest-developing innovative pile hole construction technique, rotary drilling cast-in-place piles are hailed as a ...
china latest news about Four steps to improve the construction quality of PHC pipe pile

Four steps to improve the construction quality of PHC pipe pile

September 5, 2025

I. ACCESS CONTROL The strength of the pipe pile shall reach 100% of the design value before it can be transported to the site. The product qualification certificate, appearance and external dimensions shall be checked when entering the site. Appearance: no honeycomb, exposed concrete, cracks, ...
china latest news about Two technical methods to improve the bearing capacity of rotary pile

Two technical methods to improve the bearing capacity of rotary pile

August 8, 2025

At present, the common technical methods to improve the vertical bearing capacity of single pile in cast-in-place piles are foundation expansion method and post-grouting method. In the same stratum, pile end resistance is proportional to the pile's end base area. When the pile diameter remains ...
china latest news about When should an underground continuous wall be used?

When should an underground continuous wall be used?

September 28, 2025

1. Characteristics of Underground Continuous Walls An underground continuous wall is constructed using specialized excavation equipment. The process involves excavating a slot-shaped hole along the perimeter of a foundation or underground structure to specified dimensions, followed by installing ...
china latest news about Four steps to improve the construction quality of PHC pipe pile

Four steps to improve the construction quality of PHC pipe pile

August 22, 2025

1. Entry control 1. The strength of the pipe pile shall reach 100% of the design value before it can be transported to the site. 2. The product qualification certificate, appearance and external dimensions shall be checked when entering the site. (1) Appearance: no honeycomb, exposed concrete, ...
china latest news about When to do foundation pit support?

When to do foundation pit support?

July 24, 2025

Foundation pit support engineering is a high-risk technical field in the construction industry. Although the incidence of foundation pit accidents nationwide has been decreasing year by year, such incidents still occur from time to time. Improper design and substandard construction quality remain ...
china latest news about How to drill holes and deliver piles for pipe piles?

How to drill holes and deliver piles for pipe piles?

July 10, 2025

Pier foundation hole leading method construction (1) The diameter of the pilot hole should not exceed 0.9 times of the diameter of the pipe pile, and measures to prevent collapse of the hole should be taken. The depth of the pilot hole should not exceed 12m; (2) It is advisable to use long spiral ...
china latest news about Construction plan of rotary drilling rig in karst stratum

Construction plan of rotary drilling rig in karst stratum

July 4, 2025

When drilling in karst areas, the slurry is prone to leakage, causing a sudden drop in the slurry level inside the hole. This can lead to the failure of the casing and result in borehole collapse. The fill material in karst areas is loose and has collapsed, and if the volume of the karst area is too ...
china latest news about Osaka to Kansai Expo Stage "Mengzhou Station" project

Osaka to Kansai Expo Stage "Mengzhou Station" project

June 27, 2025

The 2025 Japan International Expo (Osaka Kansai Expo) will take place on the artificial island of Dream Island in Osaka Bay. Plans include extending the subway, which will serve as the primary transportation route to the venue. Odaiba Corporation, responsible for constructing the port railway and ...
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