Best fire case 60 series horizontal directional dr

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Case 60 series horizontal directional drilling rig and its application

1 case 60 series directional drilling rig structure and working principle

case 60 series directional drilling rig is a kind of construction equipment provided by case company for the construction of public facilities. It provides a new and effective means to bid farewell to the old methods of digging roads for the placement of pipelines under roads and sidewalks or empty racks or grooves for the installation of pipelines in river sections

1.1 working principle of case horizontal directional drilling rig

first drill under the road, sidewalk or river with a drill bit. The operator uses the data of the bit in the underground (such as the bit position and depth) returned by the directional controller to operate the drill on the ground to control the direction of the bit in the underground, so that the bit can bypass the original underground utility pipeline and drill out of the ground smoothly. After the drill L is completed, use the back expander to expand the original channel. At the same time, the drill pipe can drag the cable or other pipes connected with the back expander back along the original channel to complete the laying of underground pipelines. There is no need to damage the pavement or carry out underwater operations during the whole construction process, which has the effect of reducing project costs, improving efficiency and improving the environment

1.2 case overall optimization drilling rig

in order to adapt to the rapid development of trenchless construction needs and engineering contractors' increasingly high-grade requirements for equipment. The optimization and improvement of the drilling rig are concentrated in four parts: the six cylinder engine is used as the main force, the power head double force push-pull drive system, and the drilling/pullback and torque hydraulic systems are independent and adopt optimization technology in multiple directions, giving users a new concept of directional drilling rig

1.2.1 the six cylinder engine is used as the main force to provide strong backup capacity

the 6030 drilling rig of case company adopts the six cylinder engine as the main force of this level of directional drilling rig. The six cylinder engine provides sufficient backup power, and the drilling/pullback force of 13.6t is the highest in the same gear. Keith's design concept is believed to be emulated by peers in the near future

1.2.2 times the force push-pull drive system, output high-efficiency drilling power

case 6010 and 6030 directional drilling rigs can output amazing 11500 pounds and 30000 pounds of drilling pull back force respectively, breaking through the limitation of the performance level of traditional drilling rigs. High efficiency push-pull is achieved by equipped with the patented case force push-pull system. The double force push-pull system has a unique structure, which increases the double bearing capacity, thereby reducing the risk of the constructor, reducing the load of the main components by 50%, extending the service life of the push zipper strip and improving the reliability of the equipment

1.2.3 drilling/pullback and torque hydraulic system are independent

traditional directional drilling rigs use a set of hydraulic system in drilling side pullback and torque output. The hidden danger is that when the project requires the maximum torque and pullback force at the same time, a set of hydraulic system cannot provide sufficient output. After changing this part into two sets of independent hydraulic systems, the case 60 series drilling rig can provide the power required for drilling/pullback and torque respectively, which is the only drilling rig of its kind. When the two sets of hydraulic oil circuit drilling rigs are working, the drilling pull back and torque can reach the maximum at the same time, and always maintain this working state

1.2.4 overall optimization and lifting, people-oriented, provide the greatest convenience for the operator

case's overall optimization and lifting of 60 series drilling rigs is not only reflected in the improvement of construction risk resistance. At the same time, it also takes into account the comfort, convenience and easy maintenance of the operator when using the machine. Ergonomically designed operation chair and all-weather electronic control panel reduce the working intensity of operators; The lift up integral hood is convenient for maintenance and repair; The multi hole anchor pile mechanism can support and position the drill after classification, and it can still stabilize the drill in case of complex terrain: there are many places in the equipment for such optimization improvement

2 Application of case 6030 directional drilling rig in Huangpu River project

determination of 2.1 model

China submarine cable construction company (hereinafter referred to as submarine cable company) recently undertook the project of Shanghai Information (Network) port to bury optical cables from North to south from the bottom of Huangpu River. As the communication optical cable of Mishi ferry on Huangpu River is the most critical hub to ensure the smooth communication between Songjiang and Shanghai urban area, and the geographical conditions are special, according to the project requirements, submarine cable company and the technical personnel of case directional drilling rig, the general distributor in China, Shifang international company of the United States, jointly analyzed and finally determined to use case 6030 horizontal directional drilling rig as the construction equipment of the project. The six cylinder engine of case 6030 is used as the main engine power, which reserves sufficient backup support power; The tensile capacity of double force push-pull drive system is twice that of ordinary equipment; The power output of drill put back drag and torque is independent, and the hydraulic system does not interfere with each other; These advantages are a strong guarantee for the completion of this challenging project

2.2 determination of supporting equipment

in addition to the main machine, the main supporting facilities for directional drilling construction, including directional control instrument, mud system and the selection and allocation of mud and drilling tools, need to be determined according to the actual situation of the project

2.2.1 direction controller

Mishi ferry project has a long distance and large depth drop. Submarine cable company has specially ordered the markiv wired direction controller from DCI company of the United States. We are absorbing advanced technology at home and abroad. The wired direction controller is mainly composed of signal bar, remote display instrument, detector and signal transmission line. The signal bar is installed in a special non-magnetic drill, and the transmission line is connected with the signal bar to transmit directional control parameters (tilt angle, rotation direction, temperature, etc., which cannot provide depth signals) to the drilling console. The wired direction control parameters are not disturbed by space electromagnetic waves. Suitable for long-distance crossing. The mariv wired direction controller of DCI company is a technical improvement on the wireless direction control mode. The direction control ability is the first among small direction controllers (depth 43M, distance 0m). The energy required by the signal rod is obtained from the drill through the cable to ensure the uninterrupted long-distance crossing of the tablet. For the Mishi ferry project, Shifang company and case company specially hired mr.joezeck, a directional control expert from DCI company from the United States, to make a special trip to the site for technical guidance. Shifang company sends two full-time engineers in non excavation to assist in the work on site

2.2.2 case mud system

for the long crossing distance of Huangpu River and the large amount of mud, submarine cable company ordered two sets of case bpm335 mud mixing system. The effect of mud configuration directly affects the quality of drilling holes, while the solid particles of mud are easy to agglomerate when encountering water and cannot be fully hydrated, which puzzles rig manufacturers and users. The mixing method of the mud system of case horizontal directional drilling rig is designed as front shear mixing, that is, before the mud particles enter the water, they are fully chopped to increase the area of the particles in contact with the water and reduce the particles from sticking together. After the mud particles enter the mud tank, they are directly sent to the mud tank by the suction circulation system for 360 degrees. Stir to get the best mixing effect. The case mud system has simple structure and light weight, which is very convenient for the relocation of field construction

directional drilling requires a large amount of mud. The role of mud in directional drilling technology is compared to "human blood". It plays the role of lubrication, wall fixing and cleaning of the duct, and circularly cools the signal bar to ensure the normal working temperature of the signal bar. Case provides more than a dozen kinds of mud products, which provide a way for users to prepare effective mud in ordinary strata and complex geology. Keith high-efficiency boron moistening soil suitable for sand layer and "one-step composite boron moistening soil" used for sand layer. More than ten kinds of Keith mud additives can be configured into different mud liquids for tillage soil, sand soil, gravel soil and rock formation pore forming. Because there are many kinds of mud, how to use it varies from place to place. Therefore, the soil condition of the construction section should be fully understood before construction, so as to determine the appropriate mud ratio

3 the construction process of the case 6030 horizontal directional drilling rig crossing the Huangpu River project

3.1 and the leading product R & D is the polylactic acid R & D of Haizheng group and the engineering construction preparation process of using the scientific and technological innovation team

the geology of Mishi ferry, like most areas in Shanghai, belongs to the alluvial plain soil layer, so the mud is mainly chemical polymers. Considering the long crossing distance, in order to prevent the melting soil from wrapping the drilling tool, the special case paste proof drilling fluid is proportioned in the chemical polymer to further reduce the resistance in the hole. Although geological data show that the soil quality of Mishi ferry is religious soil, the Huangpu River has a long history and complex conditions at the bottom of the river, which is far from being completely described by a geological report. For this reason, the special high-efficiency boron moistening soil of case and other auxiliary additives of case are also prepared on site to prepare emergency measures for soil changes

the project of mishidukou section requires the buried length of optical cable to be 360m, Taking wuchukou as the "Kuangji horizontal plane", the buried depth is 24m downward, and the optical cable is 6m away from the lowest point at the bottom of the riverbed. The entrance and exit are 50m away from the river bank respectively. Three 43 silicon core pipes are laid. The main difficulties of this project are as follows: ① the height difference between the optical cable position at the entrance and exit points and the lowest point (24m) ; ② The construction section is located on the waterway with busy shipping, and there are many ships in rush of water; ③ When drilling under the 260 meter wide river, directional detection cannot be carried out on the water surface in the center of the river for about 100 meters. According to these actual conditions, the technicians of Shifang and submarine cable company have formulated the construction plan pertinently

the construction is divided into four stages: the first stage is incident leveling, and the drilling depth of this section should reach about 24m. The horizontal distance shall not be less than 130m, and a leveling inflection point shall be formed; In the second stage, the leveling drilling is carried out, the direction is maintained at the turning point, and the horizontal crossing of the river bottom is completed. The crossing distance is about 120m, and the depth is 6m from the riverbed; The third stage is to excavate upward, complete the upward direction adjustment, and ensure that it is at the scheduled excavation point; In the fourth stage, according to the restrictions of construction conditions, one-time hole expansion and back dragging are adopted, and the buried pipes are placed

3.2 field implementation process of the project

after making full preparations, the first stage of drilling is started. The first drill pipe equipped with non-magnetic drill pipe is 20. At the same angle, after drilling 43 drill pipes continuously, the drilling depth reaches 25m underwater, and the drilling length is 132M. From the perspective of the river, it is impossible to control the direction here, and the second stage of construction is required in the design scheme; The driller uses three drill pipes to change cumulatively, forming a relatively large inflection point, and then enters the leveling drilling. Without depth signal, the driller relies on the direction control system to provide tilt angle and steering surface parameters, so as to keep the drill plate at 360 ° underground. The state of rotation controls the horizontal direction of advance. In the horizontal directional drilling crossing, this method is called "100 drill". After drilling the 89th drill pipe, the driller left the drill board at 12o'clock and began the third stage of operation. Continuously adjust the angle of eight drill pipes to keep the drill plate inclined and straight upward, and complete the crossing distance of about 110 meters in the horizontal direction; On February 20, the drill board finally appeared less than half a meter away from the original excavation point. Although the excavation point did not completely coincide with the scheduled point, the error of this distance was within the estimated range

since the diameter of the buried three HDPE silicon core tubes after total bunching is not more than 90mm, one-time eye expansion and pullback can be adopted. Taking into account the length of the drag back hole and the large curvature of the inflection point, it is necessary to prevent pipe jamming at the inflection point. The expander adopts flow

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