CLAMPSHELL- CONSTRUCTION EQUIPMENT.pptx

construction equipment - clampshell

1. CLAM SHELL CONSTRUCTION EQUIPMENT BY AKANKSHA PENDHARKAR

2. SIZE OF CLAMSHELLS BUCKETS : Clamshells buckets are available in various sizes; and in heavy duty type for digging, medium-weight type for general purpose , medium light-duty type for handling light materials. Buckets may have teeth that can be easily removed or they may be without teeth. Teeth are used in digging harder types of materials but are not required when a bucket is re-handling materials. The clam-shell bucket is a sophisticated articulating two-piece bucket mechanically hinged at the middle to form a claw-like appendage with an internal volume . Clamshells are used primarily for handling loose materials such as sand, gravel, crushed stone, etc. and for removing materials from cofferdams, pier foundations, etc. They are specially suited to vertical lifting of materials from one location to another. The limit of vertical movement maybe relatively large when they are used with long crane booms. 1.WHAT IS CLAM-SHELL BUCKET? https://eikengineering.com/products/grab-series/clamshell-bucket/

3. https://www.researchgate.net/figure/Structure-of-clamshell-grab_fig1_330558119 CLAMP-SHELL COMPONENTS

4. This classification is done mainly based on the operating method And purpose of using . 2. TYPES OF CLAMP-SHELL BUCKETS HYDRAULIC CLAM-SHELL BUCKET MECHANICAL/CABLE CLAM-SHELL BUCKET HYDRAULIC CLAM-SHELL FOR TELESCOPIC ARM 1 2 3 https://aprgrabs.com/mechanical-clamshell-bucket/

5. Hydraulic clamshell grab bucket is an equipment creation with two shells, controlled by hydraulic cylinder  with one, two or four cylinders available can be horizontal or vertical mounted. Clamshell bucket can be used for loading & digging or dredging purposes. Hydraulic clamshell bucket can be execute work (load) precisely such as wood chips, waste, paper, sand, dirt, mud, & food etc . hydraulic clamshell buckets can be installed on  fixed cranes, truck, forestry cranes, excavators, crawlers  and so on. Bucket have two types as light & heavy. Light bucket used for handle waste, dirt as other hand  heavy models used for intensive heavy work. FEATURES: Sturdy structure with high tensile steel. Anti-wear manganese steel teeth built grabs. Grab specially build from 0.75  cbm up to 30 cbm . Reduced height, multi-stable, can work at any angle. Hydraulic rotator for 360˚ rotation. HYDRAULIC CLAMPSHELL BUCKET https://aprgrabs.com/mechanical-clamshell-bucket/

6. The Mechanical C lamshell is designed specifically to be used on a crane for large capacity dredging and digging applications. The opening and closing action is operated via cable . The inner side of the bucket has a smooth surface for easy unloading of high viscosity material such as mud and clay, while the outer layer is reinforced with an additional layer of wear strips. The hanger is constructed with high tensile steel. Opening and closing scoop grabs is operated through rope cable. It gives an advantage when bulk materials with various densities are discharged. MECHANICAL CLAMPSHELL BUCKET https://aprgrabs.com/mechanical-clamshell-bucket/

7. These are specially designed clamshell buckets for use with cranes that are not equipped with independent holding and closing lines. simple to operate. Single rope clamshells can be used to unload bulk material for large land work projects or to remove aggregates during dredging operations.  Two Rope Clamshell buckets for two line operated cranes (One Holding Rope and One closing Rope). These grabs are especially designed for charging and discharging gravel, sand and other bulk materials. The grabs are manufactured of anti-abrasive steels. sheaves bearings are heavy duty and sealed for optimal performance.  https://aprgrabs.com/mechanical-clamshell-bucket/ SINGLE ROPE FOUR ROPE TWO ROPE These are specially designed clamshell buckets for use with cranes that are not equipped with independent holding and closing lines. simple to operate. Single rope clamshells can be used to unload bulk material for large land work projects or to remove aggregates during dredging operations.  Four Rope Mechanical Clamshell Grabs are used for attachment to four line operated large cranes, two Holding Ropes and Two Closing Ropes. It is an excellent tool for charging  and discharging sands, coal, mineral powder and bulk chemical fertilizer. electricity, vessel, metallurgy, preservation and transportation, and are exported in quantities .

8. Productive Deep-Digging Excavator with Clamshell Telescopic Arm. The clamshell telescopic arm allows the excavator to dig deep underground, down to a depth of 25 m, and to load a truck with a short cycle time, increasing uptime and production. Clamshell Telescopic Arm The clamshell telescopic arm gives dynamic actions for productive underground excavation by a combination of ropes and hydraulic cylinders . Bucket capacity: 1.30 m3 Digging depth: 25.0 m HYDRAULIC CLAMPSHELL FOR TELESCOPIC ARM

9. HYDRAULIC CLAMPSHELL FOR TELESCOPIC ARM

10. COUNTERWEIGHTS Two types of counterweights, a standard heavier type and an optional put-on type,are available . TWIN-ROPE SYSTEM The twin-rope system makes the machine safe further. Even if one of the twin ropes breaks accidentally , the other can hold the telescopic arm in position. SLIDING CAB The cab on the clamshell telescopic arm excavator is positioned forward , to allow the operator to look down deep excavation from the operator’s seat for confident excavation. The cab can further slide forward A walkway and handrail are deployed for easy access to the cab . Sliding stroke distance: 1 300 mm HYDRAULIC CLAMPSHELL FOR TELESCOPIC ARM SLIDING CAB COUNTERWEIGHTS TWIN ROPE SYSTEM

11. THE TYPES OF GRAB BUCKET CAN BE DIVIDED ACCORDING TO THE VOLUME DENSITY OF GRASPING MATERIALS Light , Medium , Heavy , Extra-heavy type. These four different types of grab bucket, in order to adapt to different volume density materials, in the case of the same volume, the weight of the grab bucket has a big difference. ACCORDING TO THE DRIVING MODE OF CLOSURE AND OPENING OF THE JAW PLATE, THE GRAB CAN BE DIVIDED INTO: Rope type: the rope grab relies on the wire rope to create a closed force to achieve the purpose of grasping the material. The rope grab is divided into single rope, double rope and four-rope grab . Power grab: power grab through the load on the power unit and the transmission device to open and close the jaw plate, such as: electric grab, motor grab.

12. DOUBLE JAW PLATE GRAB WOOD GRAB BUCKET SCISSOR GRAB BUCKET ELECTRIC MOTOR GRAB MULTI-VALVE TYPE GRAB BUCKET ELECTRIC HYDRAULIC GRAB TYPES OF GRAB BUCKETS

13. 3. SELECTION CRITERIA FOR EQUIPMENT There are many types of factors behind the selection of construction equipment, and the types are completely describe below Economic Consideration. The economic consideration such as owning costs and operating fuel costs of   equipment, the resale value, the replacement cost , salvage value are most important in selection of equipment. Site Specific . Site condition, both ground conditions as well as climatic conditions may affect the equipment selection decision . Equipment Specific . Construction equipment come with high price tags . Client and project Specific . The owner/client in acertain project may have certain preferences that are no in line with the construction companys preferred policies as far as equipment procurement is concerned. Manufacturer Specific . A construction company may prefer to buy equipment from the same manufacturer again and again, and that too from a specific dealer. Labor Consideration. Shortage of manpower in some situations may lead to decision in favor of procuring equipment that is highly automated.

14. 4. SELECTION CRITERIA FOR CLAMSHELL Quantities of material to be moved The available time to complete the work the job conditions The prevailing soil types, the swell and compaction factors , etc. The job conditions include factors such as availability of loading and dumping area, accessibility of site, traffic flows and whether conditions at site In order to plan the number of earthwork equipment needed , the planner first determine the following:- The suitable class of equipment for earthwork-for example, if the soil to be excavated is loose and marshy, and bulk excavation is involved in the project, one may optimized for a dragline.

15. When working with any type of equipment, it is critical that a thorough pre-use inspection be performed. Proper task planning helps to ensure that : Everyone involved in the work activity is aware of what the team is doing. Each individual is aware of his/her responsibility. The correct tools and equipment are available. Potential hazards are identified and mitigated. Clamshell dredging is a duty cycle process and will require more frequent planned maintenance. This will allow you to be prepared at all times and help to eliminate surprises; it also prevents overlooking of maintenance while focusing on other areas of the work, such as the spoils pile. Following are several items to consider during the development of a task plan for clamshell dredging operations. Condition of equipment: --Is the crane the right size and type for the operation? --Have the crane and components been properly inspected? --Has the clamshell bucket been properly sized and inspected? --What potential hazards were found during inspection of the equipment? --Is all required equipment documentation current and available? 5.TASK PLANNING FOR GREDGING WITH CLAMPSHELL

16. EQUIPMENT SETUP --How stable and level is the surface area upon which the crane and the clamshell, and other associated equipment, will be set? --What size equipment mats are needed? --Have measures been taken to prevent the bucket from opening while unloading/loading ? --Are there structures (buildings, trees, electrical lines or poles, bridges, pipes, etc.) that have the potential to contact any part of the crane or its attachments during operation (think 360s)? --Has personnel access to the swing area and load travel path been closed and properly barricaded so nobody will be under a load? --Have all equipment, materials and other items that could be damaged by a falling load been moved out of the swing area and travel path or otherwise been protected? --Are there vibrations from other sources (local traffic, work operations, etc.) that may pose a potential settling or tipping hazard to the equipment or clamshell bucket while set stationary or during operation ? 5.TASK PLANNING FOR GREDGING WITH CLAMPSHELL

17. SCHEDULED AND UNSCHEDULED MAINTENANCE --Is time scheduled to inspect and service the boom, wire rope, and sheaves of the crane at least twice per shift and the bucket pins, arms, teeth, sheaves, and ropes even more often? --Have the area and equipment been identified so the bucket can be blocked, secured, and prevented from opening while being serviced? --Has the "Jack line," or closing line, been prepared in advance to be replaced on a regular basis prior to its breaking? --How will the bucket be kept secured in the event of a wire rope or pin failure? Protection of the public and other workers: --Is the public protected from access to the work site? --Are other workers able to maintain a safe distance from the clamshell operations? --Has the spoil removal process been set up to limit exposure to other workers and the public? 5.TASK PLANNING FOR GREDGING WITH CLAMPSHELL

18. • Digging pits for ground construction work. • Ideal for digging and loading material in tight and limited spaces. • Material handling, loading and unloading industrial wastes, grains, sands, etc. • Heavy duty mechanical clam-shell is ideal for dredging application by crane.  6.APPLICATIONS

19. Clamshell Grab Buckets for Mucking - foundation well mucking. Rehandling Clamshell Buckets- These are widely used for many industrial purpose of transferring products from one place to other . Hydraulic clamshell buckets - commonly used to carry aggregates such as earth , sand and gravel. Single rope cable clamshell buckets – these are more heavy duty clamshell buckets are are typically used on cranes Two Line Digging Buckets - powerful earth-moving for large projects that can range from commercial, civic, or marine applications. These buckets are used with cranes Digging clamshell bucket – as the name suggests, this is the clamshell bucket of choice for excavation work where heavy loads are to be dug and moved out. Rock Grapples- Ideal for moving aggregates, creating construction driveways, jetties, and other large rock features . These can also be used to remove rocks and debris from soil efficiently or clear land before a piling project begins . Electro-Hydraulic Buckets- marine or terrestrial projects Ore Buckets- heavy loads and operate in any conditions for transporting large amounts of aggregate.commonly used in mining operations.  6. APPLICATIONS ACCORDING TO TYPES OF BUCKETS

20. CYCLE TIME (TCYCLE) - The cycle time is the total time required for the dredge to empty, move to the desired location, fill the bucket and empty it. As the cycle time increases, so does the project length, and therefore cost . SWING ANGLE (ΘSW) - The first parameter is swing angle() sw θ. The swing angle is the difference between the location where sediment is dropped into the hopper barge and the location where the sediment is excavated . SWING SPEED (ΩSW) - Swing speed () sw ω is the rate that the mechanical clamshell dredge rotates to and from the excavation site and the barge . Fall Velocity ( uf ) The rate or speed at which the bucket is lowered to the bottom is the fall velocity()f u . GRAB TIME (TG)- The grab time ()g t is the time required to close the clamshell on the sediment and is given in seconds. A common grab time value is 1 second, and it can be adjusted for buckets of various sizes. EMPTY TIME (TE) - The empty time ()e t is the time required for the sediment to leave the bucket after opening. An average value is 2.6 seconds, which is the suggested default value. 7. CLAMPSHELL THEORY

21. 8.TOP BRANDS OF CLAMPSHELL https://blog.iseekplant.com.au/blog/top-ten-heavy-equipment-manufacturers

22. THANK YOU BY AKANKSHA PENDHARKAR