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Horizontal directional drilling (HDD) is a method of underground utility installation that uses a drilling rig to bore a hole horizontally through soil or rock. HDD rigs are essential tools for many construction projects, especially those involving trenchless technology. Here’s a beginner’s guide on how to use HDD rigs. Equipment Needed To use an HDD rig, you will need the …

This issue mainly introduces the TV detection and sonar detection technology in the pipeline detection method. TV detection is mainly suitable for detection when the water level in the pipeline is low, and it can comprehensively check the structural and functional conditions of the drainage pipeline. Sonar testing can only be used to detect underwater objects. It can detect mud …

Pipe jacking construction technology has become an indispensable part of the current municipal engineering with a series of advantages such as small impact on the environment and saving manpower. However, due to the pipe jacking construction technology, additional stress field is generated in the surrounding soil, resulting in changes in mechanical properties such as loading and unloading, causing soil disturbance. …

Any kind of trenchless construction technology, if there is no standard to regulate, or if the construction is not in accordance with the standard, quality problems may occur. Although we are vigorously promoting CIPP repair technology, we cannot take potential quality problems lightly. Recognizing the possible problems in this method will help us to further improve the technology and improve …

When the pipeline is buried in quicksand layer or soft soil layer, the pipeline foundation is vulnerable to instability and fracture, causing interface disconnection and leakage, causing soil and water loss around the pipeline, pipeline sinking and damage, and road surface collapse. Therefore, to ensure the quality and long-term effect of pipeline repair, the pipeline foundation and surrounding soil must …

The spiral pipe jacking machine is a kind of equidistant spiral rod for mud discharge of roadheader head, including a cylinder, a spiral rod, a spiral vane group fixed on the spiral rod and a mud discharge pipe. The cylinder and the mud discharge pipe are sleeved outside the spiral vane group. The spiral vane group includes several spiral vanes …

During the construction and use of underground pipelines, due to continuous or discontinuous physical, chemical, biochemical and biological erosion, defects of different degrees often occur. The types of pipeline defects include pipeline leakage, pipeline blockage, pipeline displacement, mechanical wear, pipeline corrosion, pipeline cracks, pipeline rupture and pipeline collapse, etc. There are many reasons for pipeline leakage, generally speaking, there are …

The point CIPP repair technology is similar to the in-situ curing pipeline repair technology (CIPP), and also uses the same or similar materials. It is mainly used to repair partially damaged pipelines and has been applied for more than 30 years. During construction, the short liner is wrapped on an expandable roller and pulled into the site to be repaired …

When the water supply pipeline passes through railways, highways and river valleys, certain measures must be taken. When the pipeline crosses the railway, its crossing location, method and construction method shall strictly comply with the provisions of the technical specifications of the railway department for crossing the railway. According to the importance of the railway, the following measures shall be …

The basic function of HDD drilling rig is to realize guided feeding, rotation and reaming pullback, rotation and long-distance pullback of the lifeline to be laid, and at the same time provide a carrier for the angle adjustment of the trajectory. Drilling tools mainly include drill rods, screw drilling tools, transfer cases, etc., to achieve effective transmission of force and …

Construction characteristics of horizontal directional drilling 1. Directional drilling crossing construction will not hinder traffic, damage green space, vegetation and buildings, and affect the normal life and work order of residents. 2. Modern crossing equipment has high crossing accuracy and is easy to adjust the laying direction and burial depth. 3. The buried depth of urban pipe network is generally …

Because the existing pipelines in the city’s underground are criss-crossed, the pipelines are heavy, chaotic and dense, forming artificial underground obstacles, which brings difficulties and risks to the trenchless construction. The situation of causing economic losses occurs, so the underground pipeline detection of the construction site must be carried out before the trenchless construction. So what are the trenchless pipeline …