1, multi-functional, widely used

There are many types of strata in China, and the purpose of engineering investigation is different. Although the drilling is not deep, the complexity of the drilling technology is no less than that of deep-hole core drilling. For this purpose, the rig used must have the characteristics of multi-function. At present, the engineering drill products at home and abroad have a variety of drilling functions such as rotary, impact, vibration, static pressure, etc. Some also have the combined drilling functions of rotary pipe drilling and rotary vibration hole drilling, especially worthy of attention is that the hydraulic vibrator attached to the drill is very effective for drilling sand and gravel formation. The vibrator uses a pair of eccentric wheels to rotate at a high speed in the opposite direction, generating centrifugal force, so that the vibrator is a high group vibration in the vertical direction, thus generating exciting force. By changing the rotation direction of the liquid motor and adjusting the hammer mechanism of the vibrator, the vibrator can be made to vibrate bidirectional, up and down, which can be used for sinking casing and pulling casing.

2, large capacity, large reserve coefficient

Medium and deep hole core drilling machine often takes lifting ability as the basic parameter of drilling ability, but engineering drilling machine is not, because the drilling is shallow, the weight of the drilling tool is not up to much, and the power is mainly used to overcome the huge resistance of the gravel layer in the rotating soil layer. For example, the rotary casing and pipe drilling method and the promising long auger drilling method require a large torque. Therefore, the power of an engineering drilling rig with a drilling hole depth of 30 to 50 meters is much greater than that of a core drilling rig with the same drilling capacity. It is understood that most of the drilling RIGS for engineering investigation in Hong Kong still use vertical shaft drilling RIGS; One of the reasons for this is its large capacity, which is convenient for dealing with complex formations. Another special reason is that the area requires each borehole to be drilled below 5 meters of bedrock before the final hole can be drilled. The bedrock here is all 8-10 grade granite, most of which need to be drilled with diamond core, so the CS-3 drill with high and low rotation (40~1000 RPM) and the vertical shaft structure of the Datong hole is very suitable for engineering investigation and construction in this area.

3, car installation, with mast drilling frame

Due to shallow drilling, short construction period, frequent movement of drilling rig, and flat urban construction road, engineering drilling rig has a variety of vehicle loading methods. The most common is a two-wheeled trailer truck, such as G-ZA and GDD-50 drill RIGS; Large capacity, can be used for drilling Wells of engineering drilling RIGS installed on the car, such as G-2 and G-3 drilling RIGS; It can also be tracked or mounted on a four-wheel tractor. These car loading methods have their own advantages, the car loading is easy to long-distance transportation, but the site is narrow and difficult to turn, the hole is also difficult, the melon belt car can not drive in the urban area: the four-wheel tractor is small and flexible, can move in the construction site, and can drive on the road, is the best car loading square ball two-wheel vehicle is a simple car loading method, but due to the lack of traction power, uneven in the pothole It is difficult to pull the ground by manpower, which often causes the migration of the drilling rig to exceed the drilling time, therefore, for the corresponding capacity of the two-wheeled drilling rig, it is better to design the power self-mechanism. Because the drilling hole is not deep, the drilling tool is not heavy, most of the drilling rig is accompanied by a lightweight mast drilling frame, the height of about 6 to 8 meters, fold. Lying on the rig, easy to transport goods. The take-off and landing of the mast mostly rely on the special take-off and landing oil cylinder or the clean wire rope system of the hoist to complete.

5, with a variety of testing means

Engineering geological drilling in addition to sampling, but also to carry out a variety of tests, such as commonly used standard penetration test, dynamic penetration, static penetration, etc. The standard penetration test is to use the elevator to lift the core heavy sleep, pull to a certain height and then rely on the automatic decoupling device to make the weight fall freely to calculate the number of hammering in a certain depth of penetration. Many engineering drilling RIGS can carry out static penetration tests, and hydraulic drilling RIGS can carry out side tests as long as they have ground anchor devices and are equipped with side testing instruments (resistance strain gauges or automatic contact detection recorders). Some drilling RIGS can carry out side pressure test, side well, side wave and so on