The document describes SCHWING Stetter Separate Placing Booms (SPB), which are specialized equipment used for concrete placement in large-scale construction, particularly for high-rise buildings.
Function Description
SCHWING Stetter Separate Placing Booms are designed to efficiently distribute concrete at construction sites, especially where traditional methods might be less effective or time-consuming. They work in conjunction with concrete pumps to deliver concrete precisely to various forms, including walls, columns, and decks. The primary function is to extend the reach of concrete placement, allowing for faster and more accurate distribution.
These placing booms are of stable box-type construction, featuring a 4-stage hydraulic folding mechanism that operates in a vertical plane. The boom is pivoted on a swiveling slewing column, enabling a wide range of motion. Operation is managed via hand levers or an installed electric remote control cable. An end hose and a connecting line facilitate the connection to the main delivery pipeline. A trestle-pin connection allows for quick separation, which is crucial when repositioning the placing boom. The first boom section is equipped with a pin joint.
The hydraulic pump, responsible for actuating all boom movements, is powered by an electric motor. The complete power unit, including the hydraulic tank and control box, is conveniently installed near the pedestal. This integrated design ensures that the system is self-contained and ready for operation.
The use of separate placing booms offers several advantages:
- Increased Placement Rates: Can boost placement rates by as much as 50% compared to other methods.
- Reduced Labor Requirements: Typically, only one person is needed to operate the placing boom, leading to less raking and finishing time due to precise placement.
- Higher Quality Concrete: Continuous flow of concrete contributes to better quality.
- Time Savings: Frees up the tower crane for other lifting operations, improving overall site efficiency.
SCHWING has a long history in this field, having introduced its first separate placing boom in 1969. The SPB models (SPB 30 through SPB 35) are versatile and can be used for both stationary applications and on truck-mounted pumps.
Important Technical Specifications
The document provides detailed technical specifications for several SPB models: SPB 25, SPB 28, SPB 32, and SPB 35.
Common Specifications:
- Dia. of pipeline: DN 125 for all models.
- Slewing range folding: 530° for all models.
- Length of end hose: 4 m for all models.
- Electric engine power: 400 V, 50 cps, protection mode IP 44.
Model-Specific Specifications:
- SPB 25 (Split boom):
- Horizontal reach from centre of rotating axis, max.: 25 m
- Electric engine power: 22 kW
- Total weight of the boom (with hydraulic oil, with pin connection on main boom to reduce handling weight): 5970 Kg
- SPB 28 (Split boom):
- Horizontal reach from centre of rotating axis, max.: 28 m
- Electric engine power: 30 kW
- Total weight of the boom (with hydraulic oil, with pin connection on main boom to reduce handling weight): 6380 Kg
- SPB 32 (Split boom):
- Horizontal reach from centre of rotating axis, max.: 30 m
- Electric engine power: 30 kW
- Total weight of the boom (with hydraulic oil, with pin connection on main boom to reduce handling weight): 7100 Kg
- SPB 35 (Split boom):
- Horizontal reach from centre of rotating axis, max.: 35 m
- Electric engine power: 30 kW
- Total weight of the boom (with hydraulic oil, with pin connection on main boom to reduce handling weight): 8350 Kg
Accessories:
- 1x Tubular head part: 638 Kg for SPB 28 and 32 / 849 Kg for SPB 35. It is 2m long with integrated flanges.
- 3x Tubular segments: 1450 Kg each segment. Consists of 3 segments, each 6m octagonal column. Total height: approx. 20 m.
- 1x Hydraulic climbing device: 75 Kg per cylinder. Includes 1 set of climbing cylinders actuated by a hand lever or remote control (push button with approx. 15m cable), and suspensions with socket pins.
- 3x Floor frames: 272 Kg each. Equipped with 2 eccentric pins, guide rollers, 2 small cross bolts, and 8 wedges.
- 1x Cross frame: 755 Kg.
- 1x Working platform: 386 Kg, to facilitate assembly and operation, accessible via ladders.
- 3x Ladder section: 4 m long, 43 Kg, with back protection.
Usage Features
The SPB systems offer flexible installation methods:
- Free standing: Up to 20 m.
- Through the floor slabs: Integrated into the building structure.
- Directly on cross frame: For ground-level or elevated base installations.
Climbing Procedure:
The boom column is guided and supported by three climbing guide frames during climbing operations. These frames transfer forces to the concrete structure and maintain stability. The climbing equipment is always installed on the lowermost climbing frame.
- Attach lifting arms to climbing cylinders and secure pins.
- Place climbing cylinders on supports of the lowermost guide frame, insert lifting pins in position "A" (for bleeding without lifting).
- Extend climbing cylinders slowly to raise the boom column and placing boom.
- Insert supporting pin above the guide frame when cylinders are fully extended.
- Insert safety latches into the next higher bore of the boom column; retract cylinders slowly to relieve load, which is then borne by supporting pins.
- Retract climbing cylinders completely.
- Withdraw lifting pins and insert into the next hole.
- Repeat steps until desired height is reached.
Safety Aspects during Climbing:
- To maintain stability, the boom column's lower edge must remain at least 1.50 m away from the lowermost climbing guide frame.
- RISK OF ACCIDENT: The boom column and placing boom may topple over if a third climbing guide frame is not installed at the top before lifting the boom column out of the lowermost guide frame.
- When a position is reached, climbing equipment and guide frame must be relocated if climbing continues. This involves moving climbing equipment to the next higher floor, dismantling the lowermost frame and refitting it at the highest floor.
- Once the desired height is reached, the boom column must be secured with wedges (eight wedges in the guides of the upper frame and eight in the lower frame).
- Attention: For static reasons, no wedges must be driven into the middle guide frame.
General Points for Using Placing Booms:
- The placing boom relieves the crane from concreting operations.
- Installation time must be considered.
- Operations require full supervision by experienced personnel.
- Comprehensive check systems are needed for installation and commissioning.
- Operators must be trained to maintain the equipment.
- Regular inspections by a competent person are required for the machine's condition and safety file reporting.
- The site electrician should regularly inspect power cables and sockets at the control panel and circuit breaker.
- If using a generator, a 75kVA unit is recommended.
- An SPB32 boom's 22kW electric motor requires an 84 Amps start-up current and 42 Amps running current.
- Safety is paramount; all assembly personnel must be trained and certified.
- Water wash-out system is recommended for cleaning the boom, as it is cost-effective and safer.
Maintenance Features
The document implicitly suggests several maintenance-related practices through its safety and assembly guidelines:
- Regular Inspections: The machine's condition on site must be inspected regularly by a competent person, with a report placed in the safety file.
- Electrical System Checks: The site electrician should regularly inspect the power cable and installed sockets at both the control panel on the boom and the circuit breaker at the mains supply.
- Lubrication: A paint brush is listed as a required tool for applying grease to connection pins/points, indicating the need for regular lubrication of moving parts.
- Tooling for Assembly/Disassembly: The list of required tools (spanners, sockets, torque wrenches, hammer) implies that components are designed for disassembly and reassembly, facilitating maintenance and repairs.
- Bolt Torque Specifications: Construction bolts in the mast section (M36 x 360 cap screws, 10.9 grade) require specific torque settings according to drawing No. 10216625. This highlights the importance of precise assembly for structural integrity and safety, which is a key aspect of long-term maintenance.
- Pipe Clamp and Safety Clip Checks: Correct pipe clamps, plastic support plates, and safety clips (including "R" clips for working platform mounting points) must be fitted and maintained to ensure the delivery line's integrity and worker safety.
- Cleaning: The recommendation for a water wash-out system for cleaning the boom suggests that regular cleaning is part of maintaining the equipment's functionality and preventing concrete buildup.
The document emphasizes that the provided information is an aid and does not replace the official operation instructions and safety manuals, which would contain more detailed maintenance schedules and procedures.
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