The limited height rotary excavation is a kind of mechanical equipment for the construction of cast-in-place pile by taking soil and forming holes. The rotary bucket is driven by the drill rod to rotate and cut the earth, and then lifted to the outside of the hole for regular dredging. The rotary drilling rig adopts a multi-purpose modular design and can be used for the construction of various piles. More convenient than previous pile drivers.

Now whether it is a building or a bridge, it is necessary to make piles underground, that is, some cement concrete pillars, so it is necessary to make holes and pour concrete first.

The drilling tools such as short spiral drill bit, common drill bucket and sand trap drill bucket matched with the high limit rotary excavator can drill into different geology such as clay layer, gravel layer, pebble layer, medium weathered mudstone, etc.

The limited height rotary excavation can be widely used in the construction of bored piles in urban high-rise buildings, railways, highways, bridges and other pile foundations. It has the characteristics of fast pile forming speed, high construction efficiency, environmental protection and energy saving.

The structure of the height-limiting rotary excavator is divided into two parts: the chassis and the working device. From the use of different chassis, can be divided into crawler and car chassis.

The working devices of the height-limiting rotary excavator mainly include luffing mechanism, mast, main and auxiliary winches, power head, follower frame, pressure device, drill pipe, drilling tool, etc. The whole machine operation adopts pilot control and load sensing, which improves the convenience and sensitivity of operation.

Advantages of 2. height-limiting rotary excavators Advantages of rotary drilling rigs

(1) Rapid rock feed, treatment of hard strata, unique construction technology can achieve rapid rock feed.

(2) The construction noise is low, does not pollute the environment, and is suitable for construction areas with high environmental protection requirements.

(3) The power is strong, the power head directly acts on the drill bit, and the torque does not attenuate during piling.

(4) The high-limit rotary excavator is suitable for different geological conditions, and its hole-forming efficiency is 5-6 times that of the bridge rotary drilling rig, which is suitable for engineering projects with tight construction period.

(5) No need to disassemble and assemble, the drill pipe is highly integrated on the host, saving working time.

(6) The operation of the high-limit rotary excavator is controlled by the full hydraulic system, which can ensure that the verticality, hole position, hole depth, sediment thickness and other indicators of the pile foundation meet the requirements of the construction specifications.

(7) The stability of the hole wall drilled by the limited height rotary excavator is good, the hole is cleaned after the hole is formed, and the construction progress is fast.

(8) Excellent performance, fast lifting speed and heavy lifting weight. The drilling rig can be rotated by 270 degrees, the workbench can be moved back and forth, and both small pile diameter and large pile diameter can be used.