Spring returns to Jiangsu, and good news keeps pouring in!

Recently, at the new school construction project on Plot 8 of Shanghai South Railway Station

Two sets of Shanghai Engineering Machinery (SEM) static drilling and root-planting method machines, with their excellent construction performance

have once again delivered a perfect "green new answer sheet"

Amid the industry's current trend of advocating green, low-carbon construction

Green and environmentally friendly — construction with static drilling and root-planting pile method equipment

showing a "blossoming at multiple sites" trend across several districts of Shanghai

using solid pile foundations to support the thoroughfare of urban infrastructure development!

Beside Luocheng Road in Xuhui District, Shanghai, two SEM SDP150H static drilling and root-planting method machines stand tall with their goose-neck masts; accompanied by the rhythmic, precisely timed drilling down, lifting, mixing, and pile planting of the equipment, they attract passersby to stop and watch.

Project site

The new school construction project on Plot 8 of Shanghai South Railway Station is located in Xuhui District, Shanghai, bordering Longwu Road to the east, Luocheng Road to the south, Shilong Road to the north, and Wuxuan Road to the west. The project covers a total land area of 24,097 square meters. The construction content includes: two new 5-story above-ground teaching buildings, one 5-story above-ground comprehensive sports building, and one 5-story above-ground administrative office building that also serves as a lecture hall, along with simultaneous implementation of an underground parking lot, outdoor grounds, and other works.

Project work site

The pile foundations for this project adopt the static drilling and root-planting pile method. The total usage of root-planted piles is 31,800 meters, about 795 piles, with a pile length of 40 m; drilling diameter: 650 mm; enlarged base diameter: 975 mm; enlarged base height: 2,000 mm. Selected pile types: PRHC 500(125) I C80 + PHDC 550-400(95) AB-500/400 C80.

▲Project work site

The project site is located within the Southwest Engineering School in Xuhui District, Shanghai. The site contains old foundations, underground pipelines, and other elements, and the environmental conditions are relatively complex, making it fairly sensitive to possible deformation, vibration, and other effects from foundation construction. There are many old buildings around the exterior of the site, so the requirements for soil squeezing during pile foundation construction are extremely high, and low noise is required to reduce disturbance to residents. The project schedule is tight, with completion required in 45 days.

▲Project work site

At the project site, two SEM SDP150H static drilling and root-planting method machines work efficiently in coordination, carrying out simultaneous construction.

As green and environmentally friendly pile foundation construction equipment fully independently developed by SEM, the two SDP150H static drilling and root-planting method machines performed impressively in this project, achieving about 300 m of piling per machine per day, or about 8-9 piles, effectively ensuring the smooth progress of the project.

▲Project work site

"This project site uses two sets of SEM static drilling and root-planting method equipment. Their products not only have high torque and large drilling depth, but also offer the advantages of low vibration, low noise, and energy saving and emission reduction during construction, perfectly matching the construction needs. SEM's product quality is very reliable, and their after-sales service is also excellent, so we feel confident when using them," said the person in charge of the on-site construction unit.

▲Project site

Staying true to the original aspiration, gathering strength to move forward steadily

SEM will continue to give play to

the responsibility and commitment of a benchmark in the green, low-carbon construction industry

to contribute new ideas and new strength

to more green construction projects for underground foundation engineering!

Hard work and dedication make life better

Introduction to the static drilling and root-planting method

The static drilling and root-planting method uses a static drilling and root-planting pile method drilling rig for drilling, full-process mixing, and bottom base enlargement, and finally plants a precast pile body. That is, it is a pile foundation method in which pretensioned prestressed concrete bamboo-joint piles (PHDC), pretensioned prestressed concrete pipe piles (PHC), and composite-reinforced prestressed concrete pipe piles (PRHC) of different specifications and models are combined in various ways to meet design requirements, and construction is carried out according to processes such as drilling, reaming, grouting, and planting.

Method features:

● No soil squeezing, no vibration, low noise;

● Good pile quality, with pile top elevation fully controllable;

● Extremely strong vertical compressive, uplift, and horizontal load resistance;

● Low slurry discharge;

● Good social benefits and promotion value.

Scope of application:

● Suitable for areas with various seismic fortification intensities, with applicable pile diameters of 500-1200 mm;

● Cohesive soil, silty soil, sandy soil, fill, gravel (pebble) soil, as well as rock strata with complex geological conditions, many interlayers, uneven weathering, and large variations in softness and hardness, with a maximum penetration depth of 90 m; when the construction site is adjacent to buildings (structures) or underground pipelines and other engineering facilities, and the use of other pile types would cause adverse effects;

● When the elevation of the top of the bearing stratum at the pile end varies greatly and the pile length is difficult to determine accurately, and the construction site does not have conditions for on-site concrete casting, or the quality of on-site cast concrete is not easy to guarantee;

● Projects with restrictions on large amounts of slurry discharge;

● When the design requires relatively high single-pile bearing capacity, and the technical and economic indicators and construction conditions are superior to those of other pile types.  

▲Construction process of static drilling and root-planting piles

Introduction to the SDP static drilling and root-planting method machine

The SDP series static drilling and root-planting method drilling rig is a new-generation drilling rig product fully independently developed by SEM, leveraging its years of accumulated R&D technical advantages in deep mixing drilling rigs and fully suitable for construction with the static drilling and root-planting method.

Method features:

1. It adopts advanced hydraulic base-enlargement technology, with the enlarged base diameter being 1-1.6 times the drilling diameter and the enlarged base height being 3 times the drilling diameter. It also uses an advanced lower-computer software historical data recording method to record and analyze various data during construction and form corresponding data curves.

2. It adopts intelligent construction management software, with an intelligent touch-screen control method, to monitor the construction process in real time and ensure construction quality. Various construction data are clearly displayed on the monitor and automatically stored, and can be output and printed.

3. The operating system is equipped with a 380V power-loss automatic shutdown program, ensuring that the drilling rig will not lose data due to freezing or power failure during use.

4. The motor startup method adopts soft start, and the soft starter itself has various motor protection functions, such as undervoltage, phase loss, phase sequence, and overload protection.

5. The hydraulic base-enlargement technology has reliable performance and uses hydraulic components of excellent quality, ensuring normal operation of hydraulic base enlargement at a depth of 80 m.

Advantages of static drilling and root-planting piles

Static drilling and root-planting piles use low-noise drilling rigs (static drilling) and the embedded method to complete precast piles (root planting) as a pile foundation technology. It is the culmination of modern pile foundation technology. After years of promotion and application, its significant advantages of being green and environmentally friendly, energy-saving and emission-reducing, and "more, faster, better, and more economical" have been highly recognized by all sectors of society.

Method features:

"More"

● By using combinations of multiple pile types such as bamboo-joint piles and composite-reinforced piles, as well as base enlargement and grouting technology, the compressive, uplift, and horizontal bearing capacity of pile foundations is greatly improved;

● Suitable for various geological conditions, especially pile foundations requiring high bearing capacity and dynamic loads.

"Faster"

● High construction efficiency, with a single machine able to drive more than 300 meters of piles per day, yielding higher economic benefits than other pile types;

● Through the drilling rig current, changes in the bearing stratum can be detected, with no need for pile cutting;

● Simple, fast, and reliable mechanical connection methods can be selected to ensure the reliability of pile splicing and the efficiency of construction.

"Better"

1. Pile materials are factory-prefabricated, ensuring quality;

2. Embedded method construction causes no soil squeezing and no damage to the pile body;

3. Intelligent construction with fully automatic equipment monitoring ensures construction quality;

4. The pile body and pile joints are protected by cement soil, improving corrosion resistance;

5. Green and environmentally friendly, fundamentally solving the problem of slurry discharge in engineering construction.

"More economical"

Under the same conditions, compared with bored cast-in-place piles:

1. Water saving (construction water use reduced by 90%);

2. Energy saving (construction energy consumption reduced by 40%);

3. Emission reduction (slurry discharge reduced by 70%);

4. Time saving (construction efficiency increased by 50%);

5. Cost saving (project cost reduced by 10%-20%);

6. Carbon emissions reduced by more than 50%.

▲Static drilling and root-planting pile material (bamboo-joint pile)

▲Static drilling and root-planting pile construction site