On December 12, 2021, about 200 leaders, experts, and technical researchers from China Railway No.4 Engineering Group Co., Ltd. visited the standardized pile foundation construction site of the Linhuaiguan Grand Bridge to guide the work.

The General Manager and Deputy General Manager of Xuteng Foundation visited the site in person and reported on the pile foundation construction to the attending leaders. The atmosphere on site was lively.

Project Overview

The Linhuaiguan Grand Bridge of the G329 Fengyang–Bengbu Realignment Project is located in the thousand-year-old town of Linhuaiguan. It is a cable-stayed bridge with two towers and two cable planes crossing the Huai River, and serves as a control and landmark project for the entire line. The cable-stayed bridge has a total length of 530 m, the main bridge towers are 137 m high, and the main span across the Huai River is 290 m. Once completed, it will become the largest bridge of its type spanning the Huai River.

Rendering of the Huai River Grand Bridge

Construction Task

In the Linhuaiguan Grand Bridge project of the G329 Fengyang–Bengbu Realignment Project undertaken by China Railway No.4 Engineering Group, our company has contracted all pile foundation construction tasks for the Linhuaiguan Grand Bridge and its approach bridges, including the main tower pile foundations of Piers 3# and 4#: a total of 36 bored cast-in-place piles with a diameter of 2.8 m. The pile foundations are mainly located in gneiss rock, with strength ranging from 80 MPa to 120 MPa. The maximum designed hole depth is 94 m, the maximum rock-socketed depth is 37 m, and the core length is 26 m.

All pile foundations in this project are constructed using the rotary drilling hole-forming process, with various drill bits and a step-by-step reaming scheme for drilling and hole formation. Four XCMG XR580HD rotary drilling rigs and two XGC85T cranes and two XGC130T cranes each have been deployed. The pile foundation construction period for the 3# and 4# main piers is expected to be 3 months.

Entering the Construction Site

Drilling Construction

XR580HD Rotary Drilling Rig

Engine power: 447 kW

Maximum hole diameter: 3.5 m

Maximum hole depth with interlocking Kelly bar: 111.5 m

Maximum hole depth with friction Kelly bar: 132 m

Rock core column extracted from a depth of 94 m

Rebar cage installation

First sealing by ball release with a large hopper, and pouring by tanker truck discharge

Civilized construction

After the on-site inspection, the leaders of China Railway No.4 Engineering Group fully affirmed the construction efficiency and standardized on-site construction of Xuteng Foundation, and gave important instructions for future work. Thank you to the leaders of China Railway No.4 Engineering Group for their long-term trust and support. Xuteng Foundation will surely live up to expectations and complete all bored cast-in-place pile construction tasks safely, with high quality, and efficiently.