He Yu, male, born in 1978. He once worked in Beijing Pile Driver Division of Sany Group. Since then, he has been working in the after-sales service department. The rotary drilling rig developed by Sany was debugged and tested by him. After its rich experience in after-sales service. Responsible for the training of after-sales and marketing personnel in the company.

He has been engaged in the training of after-sales and marketing personnel for many years. In addition to having a large number of students and such a huge resource, many years of teaching experience and training process have fully communicated and interacted with the students, making him in the special industry of rotary drilling rigs. Has keen market insight and judgment. It is believed that the pile foundation construction industry is still the focus of national economic growth in the next 3-5 years. In 2012, he decided to leave Sany Heavy Industry and began to enter the foundation construction industry.

In March 2012, He Zong purchased Sany's second-hand SR250 rotary drilling rig and began to enter the pile foundation construction industry. The equipment is mainly used in Xinning County, Shaoyang City, Hunan Province. It is used for factory foundation piling construction, real estate building foundation piling construction and other projects. The diameter of the pile is mainly 800-1500mm, the depth of the pile is generally 8-15m, and the geological conditions are mainly backfill soil, clay layer, and strongly weatherized silty mudstone, the construction started very smoothly, no matter from the construction quantity, as well as the construction speed and construction quality are good, but after the completion of the construction of a real estate pile, began to account for the construction cost, found that the construction cost of fuel consumption accounted for a large part of the cost, far more than their own budget. After careful analysis of each fuel consumption record, it was found that the pile with an aperture of 800-1000mm was close to the fuel consumed with an aperture of 1500mm. In other words, the KR250 rotary drilling rig paid a relatively large cost during the construction of small aperture, resulting in great waste. However, large models have great advantages and great profit margins when doing large pile diameters with an aperture of 1500mm. However, the 800-1000 pile holes with small aperture can be constructed with small models.

At that time, the small model of Sany Heavy Industry rotary drilling rig was mainly SR150C. Compared with the pile with a hole diameter of 800-1000mm, the fuel consumption was still very large, the construction cost was high, and the transportation was also inconvenient. Two vehicles were needed to transport, and the transportation cost was high. It takes a long time to assemble the drilling rig, and the construction cannot be carried out immediately; when the space is narrow, the rotation space is insufficient, and the large rotary drilling rig cannot enter the site, which is very inconvenient. When all the problems are here, it is quite distressing. Just by chance, I heard that Jiangsu TYSIM Machinery Company produces KR125 rotary drilling rig. It is a tailor-made product for yourself.

This type of machine has the whole transportation with drill pipe, and only one trailer is needed to meet the transportation. The design is light and can be constructed in a narrow space. It only takes half an hour from the lower truck to the construction, which can save a lot of time. In the construction of the same small aperture, the fuel consumption is low.

In April 2013, KR125 rotary drilling rig was purchased from Jiangsu TYSIM Machinery Technology Co., Ltd. and matched with the original SR250 rotary drilling rig for construction. Large model construction has large aperture and small model construction has small aperture.

Second cooperation with boss he

The project he boss cooperated with us is about the pile foundation construction of a real estate pile in Huitong County, Huaihua City, Hunan Province. The local construction site is of typical geology: stratum distribution is plain fill, strongly weathered silty mudstone and medium weathered silty mudstone. According to the geological report and field survey, the average uniaxial compressive strength is about 10MPa. Mudstone is mainly composed of clay minerals (such as hydromica, kaolinite, montmorillonite, etc.), followed by detrital minerals (quartz, feldspar, mica, etc.), epigenetic minerals (such as epidote, chlorite, etc.), ferromanganese and organic matter. The texture is soft, the consolidation degree is weaker than shale, and the recrystallization is not obvious.

The project is mainly located in the northern part of Huitong County, mainly to dig up the mountains and fill up the valleys. The buildings in this community are mainly located on the mountainside, and the height of the buildings is 7-story small tall buildings.

Overall property vision

The construction equipment is KR125 rotary drilling rig produced by Jiangsu TYSIM Machinery, equipped with 800mm pick double-bottom sand hopper for dry hole operation. Huitong County is rich in water resources. When the borehole reaches 3m, you can see the water at the bottom of the hole. 30 minutes after the completion of drilling, steel cage and concrete pouring shall be carried out, otherwise there is a lot of water in the hole, which can reach a depth of 4-5m, and water shall be pumped out by water pump when pouring concrete. The selection of drill pipe, because of the stratum on site and the performance of KR125 rotary drilling rig, most of the piles in the project are between 8-9m, and the drill pipe is 4 × 10m friction drill pipe. during construction, the second drill pipe does not need to extend out. the weight of the drill pipe itself plus the pressure transmitted by the power head, the torque of KR125 rotary drilling rig reaches 12.5T.m, which is enough to cut and destroy the rock. The purpose of drilling is thus achieved.

The above picture is the specific rock picture of the site construction

KR125 Rotary Drilling Rig under Construction

At the end: considering the actual pile pouring speed and the manufacturing speed of the reinforcement cage, the average piling of the construction site is about 10 piles per day. the project belongs to the real estate construction pile, with short construction period and strict requirements on the project quality. the construction party a is full of praise for the KR125 rotary drilling rig itself, the construction speed and quality, and thinks that the equipment is simply tailor-made for the construction of housing piles. In addition, the site's payment terms are good and the end of each month is closed. Greatly ease the construction of the financial pressure. The construction side said at the end of the year to add a KR125 rotary drilling rig.