962 results about "Underground pipeline" patented technology

A method for leakage detection of underground pipeline corridor based on dynamic infrared thermal image processing. The leakage can be detected by the following steps, including: converting infrared thermal videos into infrared thermal images; obtaining the gray scale information and temperature information of internal environment of the underground pipeline corridor. The gray scale information can realize the conventional target of pipe line state identification inside the pipeline corridor, and the temperature information can be used to detect the pipe leakage.

The invention discloses an active-omni-directional-vision-based pipeline inside functional defect detection device. The active-omni-directional-vision-based pipeline inside functional defect detection device comprises a camera shooting creeping system, a control cable and a detection analysis core operating system, wherein the detection analysis core operating system comprises a coordinated action control unit, a creeping system control unit, an image receiving unit, a functional defect and structural defect qualitative and quantitative analysis judgment module and a storage unit; and a pipeline inside omni-directional image and a laser scanning cross section slice image are subjected to machine vision processing analysis and the functional defect and the structural defect of the pipeline can be recognized. The invention also discloses an active-omni-directional-vision-based pipeline inside functional defect detection method. A brand new automatic pipeline health checking method is provided and can provide effective technical support for underground pipeline maintenance and completion acceptance.

The invention discloses an underground pipeline positioning method based on a CORS (continuous operational reference system). The method comprises the following steps of: I, establishing a CORS; II, collecting paper drawings: collecting the pipeline as-built drawings of all underground pipelines paved in an area to be positioned and the topographical map around each underground pipeline respectively; III, making an electronic map, wherein the making process comprises the steps of paper map electronization treatment, drawing scanning and pretreatment, raster image transfer, raster image orientation, image sector conversion, pipeline attribution information marking, edge matching treatment, projection conversion, data check, conversion into an embedded electronic map and the like; IV, transferring and visually displaying the electronic map; V, superposing the coordinate data of the electronic map; and VI, positioning the underground pipelines. The method disclosed by the invention is easy and convenient to use and operate, has a good using effect and high practical value, and can really realize accurate positioning of the underground pipelines and effectively solve the problems of inconvenience in positioning operation, relatively bad positioning effect and the like of the existing underground pipeline positioning method.

The invention relates to a locating technology, and aims at providing an underground pipeline locating method and a device. The underground pipeline locating method comprises: setting a burial position of an electronic tag firstly; and then obtaining longitude and latitude coordinates of the electronic tag through a detector and transmitting the longitude and latitude coordinates of the electronic tag to a background computer management system to set up electronic tag information, and forming a pipeline geographic information system (GIS) on an electronic map of the background computer management system along with engineering information; during pipeline maintenance and locating in later period, firstly using global position system (GPS) to locate roughly according to the longitude and latitude coordinates of the electronic tag in the GIS, and then using the detector to locate accurately and amending burial depth. The underground pipeline locating method and the device are capable of intuitively and accurately displaying information of a geographic position of the underground pipeline, pipeline trend, pipeline key point information and pipeline ambient condition and the like through a hand-held terminal and a GIS map, and therefore working efficiency is greatly improved.

The invention discloses belongs to the comprehensive management on underground pipelines in cities and industrial parks and aims at comprehensively and scientifically managing relevant situations of underground pipelines and improving the accuracy and the efficiency of working; in order to achieve the purpose, the invention adopts the technical scheme as follows: a GIS (Geographic Information System)-based comprehensive management system for underground pipelines comprises a data acquiring and monitoring system, a data center and a comprehensive management system for the underground pipelines, wherein the data acquiring and monitoring system is used for acquiring data at fixed monitoring points of the underground pipelines; and the data center is used as a server and is used for monitoring a process value and being communicated with process hardware, and the process hardware serves as the data acquiring and monitoring system. The system is mainly applied to comprehensive management on the underground pipelines in the cities and the industrial parks.

The invention provides a GIS-based underground pipeline operation and maintenance system. The GIS-based underground pipeline operation and maintenance system comprises a map management sub-system, a pipe network facility management sub-system, a pipe network analysis sub-system, a pipe network maintenance sub-system, a system management sub-system, a WEBGIS pipe network figure publishing sub-system and a system database; the GIS-based underground pipeline operation and maintenance system is established on the basis of a dynamic and static water supply pipe network electronic map, performs attribute query, location, analysis and statistics of pipelines and various facilities, and outputs all kinds of statistical results; after a pipe network accident happens, a valve closing scheme and a user water cut-off notice can be provided within a short time; the scheme can be rapidly adjusted after a new condition happens; graphic and character integrated modern management of a water supply pipe network is realized; a dynamic updating mechanism of pipe network data is provided; the system is accurate and high-efficient; powerful scientific decision basis is provided for water supply planning, designing, dispatching, emergency maintenance and atlas data management; the full-computer operation process for analyzing and deciding is realized; and thus, the production efficiency and the social service level of a running-water company are increased.

The invention relates to a construction method for laying water pipes, mainly solving the problems of high cost, transport expense and maintenance expense of a precast rigid pipe adopted for a traditional heavy-calibre water pipe. The construction method comprises the following steps of: excavating a foundation, laying a cushion layer at the bottom of a pipe ditch, laying pipelines, injecting water to make a core, filling concrete and backfilling the pipe ditch. In order to be convenient for maintenance, an operation well is arranged at the part of each three-way valve. Compared with an iron pipe and a steel pipe, a plastic flexible pipe has the advantages of greatly reduced production cost, good corrosion resistance, no water leakage, long service life, on-site construction, simple operation and improved construction efficiency. Compared with the traditional underground pipeline, the invention has simple operation for the maintenance and reduces the maintenance expense.

This invention provides a leakage test method and a device including: marking a basic tendency of an underground line to be tested, injecting a tracer gas in a certain pressure composition of 5% hydrogen and 95% nitrogen to the line, testing the H2 signal along the tendency of the pipeline with a H2-sensitive probe of a movable hydrogen leak detector, converting the test signal to an electric signal then converting it to a digital signal by A/D conversion, memorizing and analyzing the continuously tested digital signals to judge the leakage orientation based on the change trend weak or strong of the test signal and judging the accurate position of the leak point by comparing with the maximum value of the memory and an indicator displays the maximum value of the concentration of the tested hydrogen and indicates the location of the direction and leakage definitely. Advantage: direct indication, accurate location to reduce work intensity of test.

The invention relates to multifunctional spray irrigation equipment for landscaping. The multifunctional spray irrigation equipment comprises a second base, a rotating mechanism and a spray irrigation mechanism, wherein the rotating mechanism comprises an air cylinder, a rotating shaft, a first belt wheel, a second belt wheel, a belt, a second bearing and a second motor; the spray irrigation mechanism comprises a rocker arm type spray head, a water guide pipe, a first support rod, a support plate, a water box, a first base, a fixing block and an ascending and descending unit. The multifunctional spray irrigation equipment for landscaping has the advantages that firstly, the spray irrigation height can be regulated through the ascending and descending unit, so that various requirements of different plants on the spray irrigation height are met; secondly, the large-area spray irrigation can be realized by rotating the spray irrigation mechanism around the rotating shaft under the condition of only using the single rocker arm type spray head; through air cylinder control, the spray irrigation covering range can be adjusted, so that the laying of underground pipelines and the configuration number of spray irrigation equipment can be greatly reduced, and thus the unit area investment is reduced.

A method for underground pipeline monitoring in which a continuous alternating electrical current having a current frequency in a range of about 1 kHZ to about 8 kHz is imparted onto a pipeline, producing an alternating magnetic field at the current frequency along the pipeline. Distributed along the pipeline is a network of RFID tag sensors which absorb an amount of energy from the alternating magnetic field. The impedance of the sensors is modulated, producing a modulated sensor impedance which is detected at a location proximate the location at which the continuous alternating electrical current is imparted onto the pipeline.

The invention provides an operation period underground pipeline pipe diameter measuring method based on a ground penetrating radar. The principle is that a ground penetrating radar electromagnetic wave reflection mechanism and a pipeline special circular shape are used for achieving underground pipeline pipe diameter detecting and interpreting under the non-excavation and non-disturbance situation when an operation period pipeline of an underground pipeline is filled with lossy dielectric. The implementation steps are that (1) on the basis that underground pipeline trend, burial depth, corresponding earth surface positions and proper radar frequency spectrum parameters are determined, ground penetrating radar detecting is carried out, and radar images of three measuring points in a radar measuring line direction above the pipeline are obtained by measuring; (2) on the basis of radar image denoising processing, electromagnetic wave single-track oscillographs corresponding to the coordinates of the three measuring points are extracted; (3) electromagnetic wave transmission time from the three measuring points to a pipe wall is determined through a single-track wave curve peak-valley value; (4) on the basis that field electromagnetic wave speed is determined, the transmission distance between the three measuring points and the pipe wall is obtained; and (5) the coordinates of the three measuring points and the electromagnetic wave transmission distance between the three measuring points and the pipe wall are used for computing the pipeline pipe diameter.

The invention relates to an accurate positioning and detecting method and device for damages of an underground metal pipeline anticorrosive coating. The method comprises the following steps: a current interrupter periodically turns on or off a constant current source through the constant current source, and provides excitation signals for an underground pipeline; the ground voltages of two points along the underground pipeline route are measured by utilizing two saturation copper sulfate reference electrode detection canes which are connected with a signal measurement processor respectively; the signal measurement processor measures, records and displays the turn-on and turn-off of the pipe ground voltages; and the position of the damaged part of the underground pipeline can be determined according to the pipe ground turn-on and turn-off voltages. Through the method, the position of the damage point of the anticorrosive coating can be confirmed accurately, the detection accuracy of the damage for the underground pipeline anticorrosive coating is improved, and important guarantee is provided for mastering the normal operation situation of the pipeline, ensuring the safe operation of the pipeline and the convenience for pipeline maintenance and management.

The invention relates to a method for repairing an underground pipeline without digging, which comprises the following steps: (1) blocking and cleaning an old sewage pipeline needing repair and usingclosed circuit TV system (CCTV) equipment to detect the inner part of the pipeline; (2) delivering a waterproof barrel-shaped auxiliary lining hose pipe into the pipeline and injecting thermosetting resin to form a resin hose pipe; (3) turning over and inserting the resin hose pipe and a warm water delivery pipe for heating into the waterproof barrel-shaped auxiliary lining hose pipe; (4) expanding the resin hose pipe with water and compressed air so that the resin hose pipe is tightly attached to the inner wall of an old pipe, circularly heating by warm water and hardening and molding the thermosetting resin hose pipe so that the inner wall of the old pipe forms a new lining pipe with high strength; (5) opening pipe openings at both ends of the new lining pipe by cutting to smooth the pipeline; and (6) cutting at the extending positions of the pipe openings of the new lining pipe, which are positioned in the well wall of a check well. The method can prevent leakage, protect the pipe openings, prevent the thermosetting resin injected into the lining hose pipe from being mixed with underground water and prevent a poor phenomenon of lining material part hardening.

The invention provides a horizontal guiding drill while-drilling detection early warning system which comprises an underground while-drilling detection system and a ground signal processing and earlywarning display system that are connected with each other by a two-core communication cable, so that high speed data communication can be realized; in the construction process, the underground while-drilling detection system works under the ground and adopts active acoustic detection technology for detecting, thus completing acquisition and transmission of data of underground pipeline detection; and the ground signal processing and early warning display system works on the ground and is used for controlling the underground while-drilling detection system, processing and displaying the detection data and alarming by sound and an indicator light according to the danger level of underground obstacles. The system combines the detection technique and the drilling construction technique so as torealize while-drilling detection early warning, can effectively detect the obstacle which is about 1m far from the advance locus of a horizontal guiding drill, has higher detection accuracy and effectively reduces the construction risk.

The invention relates to a horizontal guiding drill while-drilling acoustic wave imaging detection early warning system which comprises an underground while-drilling detection and attitude measurementsystem and a ground data processing system that are connected with each other by a communication cable; wherein the underground while-drilling detection and attitude measurement system is installed between a drill rod on a horizontal guiding drill and a back-drawing device (or a guide plate) and comprises a while-drilling detection system and a while-drilling attitude measurement system which arerespectively connected with the communication cable, and a power supply administration module respectively connected with the while-drilling detection system and the while-drilling attitude measurement system by circuits; when in construction by using the horizontal guiding drill, construction and detection are carried out at the same time, and underground pipelines existing near the constructionlocus can be detected in real time; when in danger, the early warning system gives an alarm to operating staff of a drilling machine; meanwhile, the construction route map of the horizontal guiding drill can be accurately drawn, and the distribution situation of the pipelines existing near the construction route can be provided by combining the detection early warning information.

The embodiment of the invention relates to a method for positioning an underground pipeline and a system thereof. The method comprises the following steps of: transmitting an electromagnetic wave signal to a wireless radio-frequency positioning marker containing an ID code; receiving a wireless signal which is fed back by the wireless radio-frequency positioning marker and contains the ID code and the underground pipeline information; carrying out checking treatment on the ID code and the underground pipeline information; determining an embedded place name of the wireless radio-frequency positioning marker according to the ID code; determining the embedded concrete position of the pipeline; and determining the trend of the pipeline according to the orientation information of the adjacent wireless radio-frequency positioning marker. The embodiment of the invention also provides a positioning system of the underground pipeline. The positioning method and the positioning system in the embodiment of the invention can realize the accurate positioning of the underground pipeline, find fault points as soon as possible when faults happen, reduce the digging area and the compensation cost,furthermore help maintainers establish the records of maintaining in normal times and overhauling the underground pipeline.

The invention relates to a construction method for putting a tunnel shield into a hole in a special stratum, which is characterized by comprising the following steps: before putting the tunnel shield into the hole, approaching the tunnel shield to a tunnel portal gradually; injecting a bi-liquid grout into a soil layer of an external layer; chiseling off thick underground continuous wall concretein a steel ring of the tunnel portal; performing ground vertical sectional probe hole detection; welding a prepared double-layer spring steel plate on the steel ring of the tunnel portal; arranging ahole-entering device on the outer side of the steel ring of the tunnel portal; cutting internal arranged steel bars of an underground continuous concrete wall; pushing the tunnel shield into the holewithout a concrete protective layer; and injecting the bi-liquid grout again at a seam between reinforced soil and unreinforced soil bodies, wherein when the tunnel shield is put into the hole, the double-layer spring steel plate and the hole-entering device are clung to the shell of a tunnel shield machine, the tunnel shield is not pushed when the head of the tunnel shield machine enters a rubber cord fabric board, and a single fluid or the bi-liquid grout is injected into the soil layer of the external layer for replenishing grout. The construction method has the advantages of ensuring thatthe tunnel shield is safely put into the hole in the special stratum, reducing the soil loss, controlling land subsidence well and effectively protecting underground pipelines at the hole-entering part by adopting an internal and external combination measurement.

The invention relates to a construction method of a structural system of a river under a no-cutoff working condition, comprising the specific steps as follows: 1, constructing cofferdams and shortcuts; 2, removing river channel bridges and pile foundation; 3, constructing a base pit of the river channel segment; 4, constructing the parts at both sides of a new river bridge; and 5, removing the cofferdams and recovering water transportation of the river. The invention has the advantages that: 1, the road or underground pipeline is ensured to be uninterrupted in the construction period; 2, the pile foundation is arranged or fillers are filled below a drainage pipe in the paving process of the drainage pipe to ensure that the drainage pipe maintains the water-on state at the preset height after the cofferdam is gathered; 3, the drainage pipe is cut in the connection-after-disconnection manner when the underground passage ground wall is constructed to cut separately for alternative construction so as to ensure that the river is not cutoff in the construction process of an enclosing structure; and 4, the drainage pipe is supported by a lattice column support system during construction of the underground structures and bridges so as to ensure the stability of the drainage pipe and no cutoff of the river in the construction process of the underground structure.

The invention relates to underground pipeline embedding equipment, in particular to transport embedding equipment used for underground pipeline embedding. The transport embedding equipment used for underground pipeline embedding is high in working efficiency and capable of embedding pipelines in the required positions accurately and saving time and effort in the transport embedding process. In order to achieve the technical effects, the transport embedding equipment used for underground pipeline embedding comprises a mounting plate, supporting bases, first rotary shafts, a tire, a first fixing plate, a first guide rail, a first guide sleeve, a handle, a fixing block, a supporting rod, a first connecting block and the like. The supporting bases are mounted on the left side and the right side of the lower side of the mounting plate in a welded mode. The first rotary shafts are connected to the lower portions of the outer sides of the supporting bases. The transport embedding equipment has the technical effects of being high in working efficiency and capable of embedding pipelines in the required positions accurately and saving time and effort in the transport embedding process; and the underground pipelines are clamped through clamping plates.

A laying method for laying communication cables (16) is provided which allows to lay optical fiber cables (20) in an underground pipeline such as a sewage pipe neither placing direct tension nor allowing slack on them, and for a main pipe in which a plurality of optical fiber cables (20) are to be laid, the method also allows to lay optical fiber cables (20) in the upper space of inside the pipeline and to obviate the need of an expensive robot for the laying operation. In the proposed laying method, a high-strength low-elongation tension member is disposed to be slidable in the lengthwise direction along each optical fiber cable (20, 21, 22), and the tension members (25, 26, 27) are drawn into the underground pipeline (1) to tension the trunk tension member (25) thereby stretching the trunk tension member (25) substantially straight in the underground pipeline (1), and thus the optical fiber cables (20, 21, 22) are laid in the upper space of inside the underground pipeline (1). Also the branch tension member (26, 27) is tensioned in the branch pipe (4, 5) to lay the optical fiber cables (21, 22) in the branch pipe without allowing slack.

The invention relates to an underground pipeline excavation-restoration construction method of stage temperature-control field pipe-making, comprising the following steps: (1) an old sewage pipeline is plugged and cleaned, and closed-circuit television equipment is adopted to detect the inner part of the pipeline; (2) an impervious tubular auxiliary lining flexible pipe is arranged in the pipeline, and soaking hardened resin is filled to form a resin flexible pipe; (3) the resin flexible pipe and a hot water delivery pipe for heating are turned over and are inserted in the impervious tubular auxiliary lining flexible pipe; (4)the resin flexible pipe is expanded to be closely attached to the inner wall of the old pipeline by utilizing water and compression air, the hot water is heated in a circulating way, the resin flexible pipe is hardened, and a lining new pipeline is formed on the inner wall of the old pipeline; (5) the pipe orifices at two ends of the lining new pipeline are cut, so as to lead the pipeline to be smooth. The method is characterized in that: the heating circulation of hot water is divided into three steps: a first step is carried out for 40-45 minutes at the temperature of 73-75 DEG C; a second step is carried out for 55-60 minutes at the temperature of 82-84 DEG C, and a third step is carried out 30-35 minutes at the temperature of 25-30 DEG C. The method can prevent seepage, and can prevent the hardened resin which is soaked in the material and is solidified and not hard from cracking caused by sharp cooling.

The invention belongs to the field of three-dimensional geographic information system data visualization, and particularly relates to a method for automatically building a three-dimensional model of data of an underground pipeline. The method comprises the steps of building a three-dimensional virtual geographical environment according to DEM data and DOM data, cleaning and organizing the data of the underground pipeline, establishing a pipeline node tree structure relation, building underground pipeline node joints and a pipeline three-dimensional meta model, automatically building the three-dimensional model of the underground pipeline according to the structure of the underground pipeline and the positions of nodes, in a virtual geographical scene, of the underground pipeline, building a massive underground pipeline model drawing mechanism based on the LOD, loading the three-dimensional model of the underground pipeline to the virtual geographical scene, and carrying out visualization and query management. The method for automatically building the three-dimensional model of the data of the underground pipeline has the advantages that modeling and model management are flexible and convenient, the model of the underground pipeline does not need to be built manually, expression and rapid visualization of the data structure of the underground pipeline are facilitated, and rapid building and flexible management of the model of the complex underground pipeline in the virtual geographical environment are achieved.

The invention relates to an ultra-shallow earth-covered subway shield traversing operation tunnel construction method, comprising the following steps of: a. preparation before construction: (1) identifying the work condition within a traversing range before constructing; (2) modifying subway shield equipment; (3) modifying a duct piece; and (4) carrying out protection treatment on underground pipelines within the traversing range; b. actual construction: (1) dividing the ultra-shallow earth-covered subway shield traversing range into a test segment, a traversing segment and a control segment after the traversing, acquiring the optimized parameter configuration of subway shield tunnelling construction when the subway shield traversing tunnel is tunnelled on the test segment, and guiding the subway shield traversing segment tunnelling construction; (2) implementing anti-floating measures within the traversing range; (3) after the traversing, carrying out secondary tracking grouting on the upper part of a traversed tunnel in the constructed tunnel to further stabilize the soil bodies and prevent the subsequent deformation; and (4) keeping to monitor the deformation conditions of the ground and the settlement conditions of the traversed tunnel in the construction process, and summarizing monitoring data to a computer of a command center.

The invention discloses a data interaction system of an urban underground pipeline, and a method thereof. The system comprises a data layer, a service logic layer and an application layer, wherein the data layer consists of a basic topography database, a special topic pipeline network database, other relational databases, a spatial database engine and other relational database engines and is connected with a data resource management center through a spatial data engine and a relational data engine; the service logic layer is positioned between the data layer and the application layer, is a management center of a data resource platform interface, is in charge of providing various functional interfaces used by the application layer and is used for managing and distributing user roles and data, delimiting a data permission and auditing and publishing the data; and the application layer is used for providing various applications on the basis of the service logic layer, transmits a user request to the data layer and is also in charge of sending the processed data obtained from the data layer to the user.

The invention discloses a method for comprehensively treating saline and alkaline land through combination of irrigation and planting. The method comprises the following steps: (a) paving underground pipelines, including micro-moisture pipes for irrigation and salt discharge underground pipes for discharging salt; (b) leveling and furrowing the saline and alkaline land for irrigation salt discharge, wherein the irrigation salt discharge includes underground salt discharge and surface salt discharge and specifically comprises the following three steps in sequence: I, performing underground salt discharge; II, performing surface salt discharge, and performing rapid large-area surface salt discharge on the saline and alkaline land subjected to the underground salt discharge through a flood irrigation way; III, repeating the underground salt discharge; (c) planting suaeda salsa on a large area, continuously performing micro-moisture irrigation salt discharge before and after seedling emergence of the suaeda salsa, performing micro-moisture irrigation intermittently after branching of the suaeda salsa till the end of the peak-growth period of the suaeda salsa, pulling up the suaeda salsa by the roots, and planting crops or continually planting the suaeda salsa according to the soil salinity to further reduce salinity.

The invention discloses an underground pipeline damage detection method and system. The method specifically comprises the steps of actively simulating variable sound signal and coupling the sound signal into a pipeline, modulating a backward scattered light signal in an optical fiber when the sound signal is transmitting in the pipeline, and acquiring the backward scattered light signal carrying sound signal information in the optical fiber; demodulating the backward scattered light signal to acquire time domain information of the sound signal to be detected; separately performing Fourier transform and wavelet transform on the time domain information of the sound signal, to acquire first and second feature parameters of the sound signal to be detected; and using the feature parameters of the sound signal to be detected as inputs, and detecting the position and degree of a damage of an underground pipeline via feature extraction and other methods. According to the method and system provided by the invention, the active sonic flaw detection method is used, the detection of the internal damage of the long underground pipeline is achieved through controlling the frequency and amplitudeof the sound signal, and the feature parameters of the sound signals of the different positions of the damaged pipeline are used for accurately positioning the damage position of the pipeline and assessing the damage degree.

The invention discloses a construction method for reinforcing soft formation in shield construction, adopting a reinforcement mode which uses plain continuous walls as the major and jet grouting piles as the auxiliary; as the plain continuous wall is adopted in the invention, with partial support, the plain continuous wall can withstand external soil-water pressure to ensure the stability of a working face, and tunnel portals can be broken down in advance before launching shield construction to prevent confliction with the shield assembly and debugging; the bulk breaking and construction can be safely and quickly carried out on a connection access; the construction process is simplified; the requirements on plain continuous wall are relatively simple, joints do not need to be specifically made, then a pile jetting machine is adopted to punch continuously in the construction process; after the plain continuous wall is used for reinforcement, the reinforcement range is significantly reduced, particularly applicable for engineering sites with small construction sites, intensive underground pipelines, heavy traffic on the ground and near to the foundations of the buildings on the ground; the reinforcement cycle is shortened, the age for reaching required strength is short, and the cost of the entire end is relatively low.

The present invention relates to the unopened laying of underground pipeline. The method is that after the tubular tool cut into soil, the resistance increasing part is jacked by the inflated bag around the tool to produce contact force with soil while the hydraulic cylinder inside the tubular tool produce thrust, and the common action of the two forces pushes the tool forwards inside the soil ineither straight line or curved line. The pipe jacking equipment is a telescopic pipe including three embedded sections has annular edge in front end, hydraulic cylinder inside the pipe and resistanceincreasing device around the pipe. The present invention is used in the laying of underground various pipeline.

The invention discloses a silty soil stratum pipe-jacking jacking construction method based on a tool pipe with a steel sleeve head. The method includes the steps that firstly, a work well is constructed, wherein the work well used for jacking a construction underground pipeline is constructed, the construction underground pipeline is formed by splicing a plurality of pipeline splicing joints, the tool pipe with the steel sleeve head comprises the steel sleeve pipe, a supporting ring installed on the inner side of the rear end of the steel sleeve pipe and an inserting port fixed to the supporting ring, the wall thickness of the steel sleeve pipe is 0.8-1.2 cm, and the length of the steel sleeve pipe is 80-120 cm; secondly, a jacking device is installed; thirdly, the tool pipe with the steel sleeve head is jacked, wherein the tool pipe with the steel sleeve head is hoisted in place, the tool pipe with the steel sleeve head is jacked, and a soil is manually excavated in the pipe; and fourthly, pipeline jacking is performed, wherein the pipeline splicing joints in the construction underground pipelines are jacked correspondingly from front to back. The method is simple in step, reasonable in design, easy and convenient to construct, good in using effect, capable of easily, conveniently and fast completing the silty soil stratum pipe-jacking jacking construction process and safe and reliable in construction process.

Methods are provided for reducing interference from stray currents in buried pipelines/metal structures during MEIS testing or other current-sensing applications in the pipeline. Methods are also provided for measuring bulk complex electrical impedance between a buried pipe and the soil, thereby rendering an indication of the quality of the anti-corrosive coating. Methods are also provided for measuring the complex propagation constant of AC voltages propagating along an attenuative pipeline. This information is useful for assessing the general condition of the anti-corrosive coating involved, or to enhance MEIS inspection of the pipeline. Methods are also provided for enhancements to MEIS testing, including (a) canceling magnetometer offset effects associated with the Earth's magnetic field after the magnetometer is positioned for measurement, (b) implementing a separate sensing connection to the pipe so as to avoid interference from voltage loss in the pipe feed-line connection, (c) providing a power amplifier to excite the pipe with large-amplitude signals.