Recently, TYSIM KR90A small rotating drilling rig participated in the construction of a commercial housing development project in JiangYin city, JiangSu province. The project requires reformative construction to be built on the foundation of existing residential building. The surface has 40cm thick of cement ground, under the cement is the 12M long cut-off wall constructed using three axis mixing equipment, under the wall contains dirt and sand, it is deemed as a fragile stratum. The construction demands the removal of surface dirt and diaphragm wall without excavation construction. The new pile hole is required to be drilled through the concrete floor and Impermeable wall, and into the fragile stratum. The total depth of the pile hole is 18m with a diameter of 700mm. TYSIM KR90A with its strong power, managed to clear the obstruction caused by the cement floor and Impermeable wall while using the “Sludge protection wall” drilling construction method to overcome the difficulties of narrow and limited working space, sufficiently demonstrated the advantages of “compact but powerful machinery”; It has smoothly completed the construction task, reduced cost of constructions for customers, shortened the construction period, and won excellent and consistent appraisals from the customers.TYSIM KR90A rotary drilling rig has engine power of 86kw with a total weight of 25 tons, it can perform drilling diameter of 400-1200mm to reach a max drilling depth of 28m. The rig utilizes a weight-minimized design, under the same construction conditions, its light weight results in less power consumption allowing the engine to better support the drilling construction for having no need to support the heavy weight of the machinery itself. Meanwhile, the Kelly bar is also light weight, the raising and lowering speed of it can reach 75 m/min while maintaining the same safeness, the rig rotary speed can reach 5r/min. The rotary speed of the power head is 8-30r/min. Apart from the low fuel consumption design, the rig has a fast dirt-dumping speed to result in higher overall construction efficiency.At this point, TYHENG FOUNDATION CONSTRUCTION CO., LTD, which provides the small rotary drilling rig leasing service, is a wholly-owned subsidiary of TYSIM. TYHENG adopts “service” as its core value, and utilizes such attitude to provide clients with an “Eight in One” service in terms of selling, leasing, construction, trade-in, re-manufacturing, service, operator supply & training, and consulting & promotion of drilling methods. The company has a rental fleet of over 60 small and medium sized piling rigs. With the maintenance service and delivery service of piling rig provided by dozens pilling manufacturer, TYSIM has established a joint maintenance base that employs a technical and professional maintenance team which has years of experience in machinery servicing to provide clients with professional construction advice and methodologies. After five years of experience and commitment by cooperating with customers and also undertaking independent construction works, our small rotary rigs had participated in many modern constructions such as dam-reinforcement, underground pipe gallery, and over-water construction, which ultimately contributed towards the domestic promotion of the utilization of small rotary rigs.  At the same time, TYHENG is committed to creating a leading professional piling service platform at home and abroad.  One of the objectives of the Service project is to be the leading domestic brand in small rotary drilling rigs having the most complete domestic small rotary digging products series, half of the rigs are to fill the blank in our country unique demand for such products, the whole series of products and the KM series telescopic arm have passed the international CE certification, have been exported to 26 countries.  Within five years, we will strive to achieve the goal of being a domestic first-class, international well-known brand.