Wednesday, 10 November 2010



Tool digs for example back hoe, power shovel, or also known as front shovel, dragline, and clamshell. Backhoe and front shovel also called tool hidrolis because bucket that moved in hidrolis. Tool Election is hung from tool ability referred at one particular certain field condition. Its difference lay ins object that will dibagian front, however all tools are referred have equality with activator tool that is tyre wheel or crawler.

A. Digger Tool Hidrolis
Power shovel and backhoe those included in digger tool hidrolis haves bucket that paired in front its. Intended digger tool hidrolis is tool that work caused by pressure hidrolis at machine into its operation. Its activator Tool is tractor with tyre wheel or crawler.

1. Front Shovel
Front shovel is used to dig laid at significant above surface of tool place referred exists. This tool have ability to dig hard significant. If significant that dug have the character of soften then front shovel will find difficulties. Capacities bucket front shovel is hung from significant type. In consequence, there is factor correction into determines capacities bucket. (factor correction are referred as multiplied with capacities bucket.

Table Factor correction (BFF) for tool dig

Factor-factor that influence cycle of front activity shovel is capacities loads bucket, movement bucket with payload, cargo discharging and movement empty bucket. For fairish bucket between 2,3 till 3,8 m3s, time of front cycle shovel is following.
a). time loads : 7 till 9 second
b). rotary time with payload : 4 till 6 second
c). time unloads : 2 till 4 second
d). Time reruns : 4 till 5 second
Whereas front productivity shovel depend on significant type, dig height, rotation angle;corner, big tool transports, and others.

2. Backhoe
Operation backhoe generally for channel dig, tunnel; cutting or basement. Backhoe consist of activator tool that can be in the form of crawler or tyre, boom, strick and bucket. Wheeled Backhoe usually not used for dig but rather often used for other job. Capacities Election bucket backhoe must in accordance with job that will be conducted.
Backhoe same as front shovel where significant type influences didalam productivity calculation. Determination of cycle time backhoe is relied on capacities election bucket

B. Dragline
Dragline is tool digs that weared to dig laid at significant more tall from surface of tool place referred exists with further range from tools dig other. Elementary Tool from dragline is bucket that paired at boom. Length boom dragline same as crane however longer then stability dragline is must reckoned.
Dragline find difficultieses in controlling cargo discharging. In consequence, better tool of significant conveyor that weared to transport significant of dig result king sized dragline. Size of conveyor tool better 5 till 6 times the size of bucket dragline.
Productivity dragline depend on factor-faktor like significant, deepness penggalain, angle;corner swing, size bucket, length boom, capacities of conveyor tool, field condition and others. Tool Productivity is counted/calculated at condition of genuiness land/ground or bank condition.

C. Clamshell
Clamshell are used for free land/ground dig like sand, gravel, rock breaks, and others. Clamsheel lifts significant in vertical. Size bucket at clamshell vary between light till heavy. Light Bucket are generally used to move metarial, whereas bucket that used to dig. At bucket that generally paired tooth that help tool in diging significant.
Productivity Calculation clamshell have not yet standaritation, in consequence, then productivity equation for clamshell is ;
Productivity = V x 60/CT x BEF x efficiency

In general cycle time clamshell is got from estimate result base experience.
Sumber :
Alat Berat untuk Proyek Konstruksi

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