1000mm Hammer Grab Use Inside of Od1200/1120mm Casing for Bored Pile Foundation
详细信息
1000mm hammer grab use inside of od1200/1120mm casing for bored pile foundation work1000mm pile hammer grab used inside of od1200/1120mm casing for bored pile foundation work
1000mm hammer grab use together with casing oscillator for pile foundation work
1000mm hammer grab use together with casing rotator for bored pile foundation
The hammer grab is the most important tool in pile construction and it determines the drilling process,tianjin huachang xingye technology co ltd hammer grab combines the advantages of a number of good hammer grab
| NO. | size | D | L | (kg) | Pulley NO | L CAPACITY |
| 750 | 750 | 4000 | 2500 | 5 | 120 | |
| 850 | 850 | 4500 | 3300 | 5 | 210 | |
| 1000 | 1000 | 4700 | 4500 | 5 | 450 |
of top class.
These are essential advantages:
The grab has no wear-prone cable pulleys.
The closing force is produced by a scissor system which is insensitive to wear and dirt
There is no closing cable subject to frequent replacement inside the grab.
Opening of the jaws is assisted by a pretensioned spring, so that adhesive
Soils are dumped by forcefully striking open the jaw
The body of the grab is streamlined, which ensures a high fall velocity under water
Additional side pockets on the grab's lower part increase the filing capacity of jaws in soft soil
The entire construction is stress relieved and extremely strong.
Hammer grab the double rope operation as well as single rope operation are quick ,reliable and highly economical
A 1000mm hammer grab is a heavy-duty, mechanical excavation tool used in deep foundation and bored piling construction. It is specifically engineered to operate inside steel casing pipes to break up, scoop, and extract loose soil, gravel, cobbles, boulders, and soft rock layers.
Because it relies on gravity and free-fall impact to shatter and penetrate tough ground strata, its weight and jaw configuration are critical to its performance.
Technical Specifications (Typical Averages)
While dimensions vary slightly by manufacturer (such as Sambo, Buma, Leffer, or Casagrande), a hammer grab built for a 1000mm nominal casing diameter generally falls within these parameters:
| Parameter | Standard Range / Specification |
| 1000 mm (often compatible with 1000mm to 1200mm outer casing) | |
| Actual Grab/Jaw Diameter | ~850 mm - 950 mm (to allow clearance inside the casing) |
| Total Machine Height/Length | 4.0 meters - 4.8 meters |
| Total Weight (Unloaded) | 4.5 - 6.0 metric tons (Higher weight = greater impact force) |
| Jaw Capacity | 190 - 350 liters per cycle |
| Cutting Edge Material | High-strength, abrasion-resistant steel (typically NM 400/500) |
1. Shape Profiles
Spherical Grabs: Feature rounded, heavy-rimmed shells. These are ideal for high-impact forces required to split hard soil, heavy gravel, and weathered rock.
Standard/Cylindrical Grabs: Best suited for high-volume mucking of sand, clay, and loose silt layers.
2. Operational Systems
Single-Rope System: Operates using a mechanical locking mechanism (or "catcher/crown") at the top. The jaws are locked open during free fall. Upon striking the borehole bottom, the latch releases, allowing the jaws to close tightly as the single winch line pulls upward.
Double-Rope System: Uses separate hoisting and opening/closing lines. It utilizes a series of internal pulley sheaves (often a 4-line or 6-line configuration) to generate massive closing pressure, ensuring minimal soil spillage even when digging through submerged or unstable strata.
Core Applications
All-Casing Bored Piling Method: Works seamlessly in tandem with casing oscillators or rotators to clear out the inner shaft while the casing is pushed down to prevent borehole collapse.
Obstacle Removal: Used to smash through buried concrete blocks, old timbers, or large boulders that would easily stall or damage a standard drilling auger or bucket.
High Water Table Excavation: Designed with hydrodynamic profiles to descend quickly through water or drilling slurry without excessive drag or resistance.
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