Construction of Deep Drilling Rig, Germany
Customer Project
As the geothermal energy market is continuously increasing, BAUER Maschinen GmbH, a German company working in the field of specialist foundation engineering, has developed a new deep drilling rig. Dlubal Software's German customer Ing.-Büro H.-U. Möller was in charge of the plant's structural analysis. The system is used to make borings reaching to a depth of 22,965 ft in the area of geothermal energy, oil, or gas.
| Structural Engineering |
Ing.- Büro H.-U. Moller, Minden, Germany www.hum-minden.de |
| Investor |
BAUER Maschinen GmbH, Schrobenhausen, Germany www.bauer.com |
Model
In addition, it is possible to extend existing boreholes using modern boring technology. The boring device is built in Germany and distributed worldwide.
Structure
The deep drilling rig has the following dimensions: L x W x H = 82 ft x 39 ft x 137.7 ft. The mass of the entire structure is 639 t. It has a modular structure which enables transport on a truck.
The plant is self-erecting in parts and can be shifted from one bore hole to the other when built up. The drill bit is driven into the earth by a maximum rotary drive of 60°kNm and pulled out by a maximum force of 989,159 lbs.
Calculation
The model consists of 1,137 nodes and 2,052 members forming a lattice tower with the shape of a U. The guide is applied on the open U‑side.
For their calculation, the engineers have analyzed six RSTAB models with different loads and states such as plant in and out of operation with concentrated support and tension failure, lying tower, lifting of tower, mounting of winch, etc.
The structural system and loading were entered in a basic system. Then, all systems to be analyzed were derived from the base system. To determine the maximum internal forces and stresses, the six models were superimposed in a super combination.
Keywords
Deep drilling rig Drilling rig Drilling technology Drilling
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Consideration of Construction Stages in RFEM 6
The calculation of complex structures by means of finite element analysis software is generally performed on the entire model. However, the construction of such structures is a process carried out in multiple stages where the final state of the building is achieved by combining the separate structural parts. To avoid errors in the calculation of overall models, the influence of the construction process must be considered. In RFEM 6, this is possible by using the Construction Stages Analysis (CSA) add-on.
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Compared to the RF-/STEEL EC3 add-on module (RFEM 5/RSTAB 8), the following new features have been added to the Steel Design add-on for RFEM 6 / RSTAB 9:
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