Construction of Deep Drilling Rig, Germany
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. The German Dlubal Software 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 7,000 m in the area of geothermal energy, oil or gas.
Ing.- Büro H.-U. Moller, Minden, Germany
BAUER Maschinen GmbH, Schrobenhausen, Germany
In addition, it is possible to extend existing boreholes using modern boring technology. The boring device is built in Germany and distributed worldwide.
The deep drilling rig has the following dimensions: L x W x H = 25 m x 12 m x 42 m. The mass of the entire structure is 580 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 4,400 kN.
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 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.
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The RF-/STEEL EC3 add-on module automatically transfers the buckling line to be used for the flexural buckling analysis for a cross-section from the cross-section properties. In particular for general cross -sections, but also for special cases, the assignment of the buckling line can be adjusted manually in the module input.
SHAPE-THIN Table "6.2 Classification of the Cross-Section According to EN 1993-1" and Stress Diagram
SHAPE-THIN determines the effective cross-sections according to EN 1993-1-3 and EN 1993-1-5 for cold-formed sections. You can optionally check the geometric conditions for the applicability of the standard specified in EN 1993‑1‑3, Section 5.2.
The effects of local plate buckling are considered according to the method of reduced widths and the possible buckling of stiffeners (instability) is considered for stiffened sections according to EN 1993-1-3, Section 5.5.
As an option, you can perform an iterative calculation to optimize the effective cross-section.
You can display the effective cross-sections graphically.
Read more about designing cold-formed sections with SHAPE-THIN and RF-/STEEL Cold-Formed Sections in this technical article: Design of a Thin-Walled, Cold-Formed C-Section According to EN 1993-1-3.
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Programs Used for Structural Analysis
The structural engineering software for design of frame, beam and truss structures, performing linear and nonlinear calculations of internal forces, deformations, and support reactions
Stress analysis of steel members
Stability analysis according to the eigenvalue method