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06 | 07 Ensuring top performance. Parameters, equipment selection and operating principle. Choosing the right equipment is key to the economic and technical success of any vibration driving job. Parameters such as the size and drive output of the vibrator must be matched to the length and weight of the pile and the soil conditions. Vibrator selection. Important details. The graphic below provides help in determining the required centrifugal force or in selecting the right vibrator based on soil conditions, pile weight and driving depth. Mark a point on the left-hand side of the table representing the maximum driving depth, and another point on the right-hand side marking the maximum pile weight. At the point where this line crosses the soil data line for your project, draw a vertical line to the vibrator models. This provides an overview of the units which can be considered for your requirements. To determine the exact model, we can offer competent advice taking account of site-specific, geological and technical requirements. Model Driving depth [ft] Centrifugal force US ton 15 30 45 60 75 90 105 120 135 150 MS-10 HFV 16 HFV MS-24 HFV MS-32 HFV MS-48 HFV MS-5 HFBV MS-25 H2/H3 MS-10/17 HF (B) 200 400 600 MS-25 HHF 800 MS-50 H2/H3 1000 1200 1400 1600 1800 2000 2200 2400 2600 Key vibration technology data. MS-62 HFV MS-50 HHF MS-100 HHF Example Weight of double pile: 3.0 US ton Driving depth: 54 ft Vibrator selected for mediumdense soil = MS-50 HHF For high-frequency vibrator applications, the centrifugal forces determined in this way should be 30% higher. Use of additional aids such as flushing pipes or preparatory drilling can significantly increase the driving performance of a vibrator. Choosing the right vibrator for the job mainly depends on pile size, driving depth and soil conditions. The greater the driving depth and the harder or more compact the soil, the higher the centrifugal force and amplitude required. Centrifugal force and amplitude need to be high enough to overcome the surface friction and tip resistance between the pile and the surrounding soil. Key vibrator data in this context are shown in the following descriptions and formulae. G loose soil 2800 3000 3200 3400 3600 3800 4000 very dense soil (clay) dense soil medium-dense soil MS-120 HHF MS-200 HHF 1 r Centrifugal force US ton 2 3 4 5 6 7 8 9 10 11 12 Pile weight [US ton]
Key vibration technology data. Eccentric moment M [in-lbs] The eccentric moment is the mea- . M = G r Speed (frequency) n [rpm] . 2 F = M w sure of unbalance. As a determining factor for amplitude it is a key parameter for driving operations. The speed dictates the vibration frequency of the system. The vibrations are transferred via the pile to the surrounding soil, significantly reducing the surface friction between pile and soil. High frequencies counter the unwanted spread of vibrations in the soil. Centrifugal force F [US ton] G r n 2 F = M (p . ) 30 The centrifugal force must be high enough to overcome surface friction between pile and soil. Centrifugal force plays a major part in reducing surface friction and provides impact force to overcome tip resistance. Operating principle of Müller vibrators (typical design). Power pack Diesel-hydraulic Remote control Hydraulic power hoses Total amplitude S [in] S = 2s = 2 . Mstat [in-lbs] Gdyn [lbs] Together with centrifugal force, amplitude is a measure of driving performance. A large “stroke” and high “impact force” ensure good driving progress. When driving and extracting in cohesive soils, the elastic connection between pile and soil can only be broken if the amplitude is high enough. 2 Acceleration a [in/s ] . 2 a s w = with w = p . n 30 Transmission of the pile acceleration to the surrounding soil causes the displacement of the particle structure and reduces particle friction and soil resistance. Acceleration is indicated as the ratio of acceleration to gravity: w = a g Elastic hose bracket This ratio corresponds to: The value can lie between 10 and 30. Drive output P [US HP] h F . 10 = Gdyn The drive unit must be powerful enough to generate the moment needed to maintain the centrifugal force of the vibrator, even in difficult ground. The drive output should be 3 US HP per 1 US ton centrifugal force. -1 Suspension Vibration isolator (spring suspension unit) Motor Eccentric Exciter block Hydraulic clamping device Pile Gdyn
Page 1 and 2: MÜLLER-vibrators. The ideal soluti
Page 3 and 4: Integrated services. For driving an
Page 5: The M = G . r ideal combination. Pr
Page 9 and 10: Driving of 8.69 ft diameter pipes w
Page 11 and 12: AV1 Precision work between storms a
Page 13 and 14: Vibrator Centrifugal force Eccentri
Page 15 and 16: Type Centrifugal force Eccentric mo
Page 17 and 18: Type Torque Speed Oil pressure Disp
Page 19 and 20: MÜLLER clamping devices and safety
Page 21 and 22: Controlled pile driving depending o
Page 23 and 24: MÜLLER vibration driving technolog

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