Abstract: A structural flame retardant high strength low exothermic polymer grouting material for consolidating, belonging to a technical field of polyurethane material, is produced by combined the polyether polyol and the modified isocyanate in a weight ratio of 100:(100-160), leading to internal reaction temperature ?100° C., strength ?60 mPa, bonding ?3 mPa, oxygen index ?28% while no halogen and no effect on water quality, odor level (80° C.) ?3.5, and fog test ?5 mg (which means no physical additive flame retardant is diffused into the environment). In particular, with no halogen, which is known as environmental hormones, in the plasticizers, there will be less combustion smoke, wherein the present invention will not release corrosive or irritating hydrogen halide gas, nor produce toxic carcinogens polybrominated benzoxins and polybrominated dibenzofurans, thereby avoiding the long-term impact of the material on the environment.

Abstract: A method for detecting road diseases by intelligent cruise via an unmanned aerial vehicle (UAV), the UAV and a detecting system therefor are provided. The method for detecting road diseases by intelligent cruise via UAV, wherein a road disease detection model and a road recognition model based on deep learning network are built in the UAV, wherein the method specifically comprises a step of: automatically flying the UAV on a predetermined route on the actual road determined by the road recognition model, and obtaining road disease test results by the road surface disease detection model. The present invention adopts the road recognition model and road disease detection model based on deep learning network, which can realize automatic cruise and automatic road disease detection, only need to set a predetermined route or area range, which is convenient and fast.

Abstract: A grouting double-locking pressure real-time sensing system includes: a positioning structure fixed to a ground; wherein an expandable positioning structure passes through the positioning structure, and an input end of the expandable positioning structure is connected to the grouting structure; the pressure real-time monitoring component is connected to the expandable positioning structure; the expandable positioning structure comprises a hollow conduit, an expandable assembly, an upper positioning member, and a lower positioning member; wherein the upper positioning member and the lower positioning member are respectively connected to two ends of the expandable assembly; the hollow conduit passes through the upper positioning member and the lower positioning member, and is threaded to the the lower positioning member; the upper positioning member is fixed to the positioning structure; when rotating the hollow conduit, the lower positioning member moves up and down, so as to expand or contract the expandable

Abstract: The present application discloses a pipeline radar and television inspection robot which includes a robot body, a directional drilling lifting device, a directional drilling rotary device, a directional drilling swing device, a radar, cameras and a driving apparatus; wherein the directional drilling lifting device is on a front part of the robot body; the directional drilling rotary device is on the directional drilling lifting device; the directional drilling swing device is on the directional drilling rotary device; the radar and the cameras are on the directional drilling swing device; the driving apparatus are on a bottom of the robot body. The directional drilling lifting device, the radar and the cameras are plugged in the robot body. The robot body electrically connects to cables which electrically connect to a control system. The cameras and the radar are able to be adjusted and the components are connected as modules.

Abstract: An intelligent decision-making method for maintaining urban underground sewer network includes steps of: analyzing with a sewer network functional defect three-dimensional instantaneous hydraulic model; calibrating parameters by finite element fitting analysis and full-scale test, and verifying accuracy of the sewer network functional defect three-dimensional instantaneous hydraulic model; combining node water level iteration method, Preissmann slit method, Godunov finite volume method and unstructured grid to rebuild a surface-subsurface one-two-dimensional coupled connection model; using R language, dynamic library linking technology, and long-short-term memory neural network method of multi-source data samples for engineering secondary development of the surface-subsurface one-two-dimensional coupled connection model, and obtaining urban sewer network functional defect conditions with waterlogging result labels; and establishing a multi-objective planning intelligent decision-making model for sewer network

Abstract: The present invention relates to a polymer expanding material in infiltration or seepage multi-water environment and a preparation method thereof, belonging to a technical field of polymer expanding foam materials. The polymer expanding material includes the following parts of materials by weight: 20-30 parts of rosin polyester polyol, 20-50 parts of isocyanate, 20-40 parts of PhireGuard® MB-512, 5-10 parts of HFO-1233zd, 1-2 parts of surfactant, 0.01-1 part of catalyst, and 0.01 parts of benzoyl chloride. The present invention has high sand fixing body strength, fast curing speed, good elastoplasticity, good pouring property and permeability, and good expanding property, which is suitable for infiltration or seepage multi-water environment, especially for dam infiltration, piping, and other problems during construction and subsequent operation of water conservancy projects.

Abstract: Trenchless methods for forming a curved hole channel with a steel sleeve and pipeline lifting are provided, including steps of: (T1) drilling a straight hole channel, and inserting the steel sleeve into the straight hole channel; (T2) inserting a guiding pipe into the steel sleeve, and determining a bending direction of a hole channel to be formed; and (T3) inserting a flexible steel-wire pipe into the guiding pipe, and punching to form the curved hole channel. With applying the creative trenchless method for forming the curved hole channel, a specially-made grouting pipe is accurately inserted to a bottom of a subsiding pipeline section, so that a polymer material is conveniently injected to a bottom of a disease position. Though utilizing an expansion force generated by the polymer material, the subsiding pipeline section is uplifted, so as to realize trenchless repairing.

Abstract: A structural flame retardant high strength low exothermic polymer grouting material for consolidating, belonging to a technical field of polyurethane material, is produced by combined the polyether polyol and the modified isocyanate in a weight ratio of 100:(100-160), leading to internal reaction temperature ?100° C., strength ?60 mPa, bonding ?3 mPa, oxygen index ?28% while no halogen and no effect on water quality, odor level (80° C.) ?3.5, and fog test ?5 mg (which means no physical additive flame retardant is diffused into the environment). In particular, with no halogen, which is known as environmental hormones, in the plasticizers, there will be less combustion smoke, wherein the present invention will not release corrosive or irritating hydrogen halide gas, nor produce toxic carcinogens polybrominated benzoxins and polybrominated dibenzofurans, thereby avoiding the long-term impact of the material on the environment.

Abstract: The present invention relates to a silicate-modified high-toughness and low-heat polymer grouting material for reinforcement, which belongs to the technical field of materials. About 60% by weight of the raw materials of the silicate modified grouting material of the present invention is the silicate modified aqueous solution, and about 40% is the structural flame retardant isocyanate, and main components of the polymer grouting material are classified into inorganic components according to the main total proportion. The silicate-modified high-toughness and low-heat polymer grouting material for reinforcement of the present invention has excellent flame retardancy and compressive performance, wherein a compressive strength is ?60 MPa, an oxygen index is ?30%, and a maximum reaction temperature is ?100° C., an odor grade (80° C.) is ?3.5, a fog test is ?5 mg (no physical additive flame retardant diffuses to the environment), bonding is ?3 MPa, a shear strength is ?20 MPa, and a tensile strength is ?20 MPa.

Abstract: A silicate-modified polymer grouting material for leakage plugging is provided, which belongs to the technical field of silicate modification, includes 60% by weight of silicate-modified aqueous solution component, and about 40% of structural flame-retardant isocyanate. According to the proportion of the main total amount, the main components are classified into inorganic components, so the silicate-modified polymer grouting material for leakage plugging has excellent flame retardant performance, oxygen index ?35%, adhesion ?1.5 mPa, maximum reaction temperature ?95° C., odor level (80° C.) ?3.5, fog test ?5 mg (without physical additive flame retardants diffusion to the environment). In particular, a main component of the silicate-modified aqueous solution, endows it with good surface resistance.

Abstract: A silicate modified polymer foam material for filling and sealing contains prepolymerized isocyanate and a silicate modified aqueous solution with a mass ratio in a range of 1:(1.2-1.4). In the prepolymerized isocyanate, a mass percentage of P is 4.4%, a mass percentage of N is 7.9%, and a mass percentage of —NCO is 11.9%. The silicate modified aqueous solution includes liquid sodium silicate, small molecule alcohol, water and a catalyst, wherein the liquid sodium silicate, the small molecule alcohol, the water and the catalyst account for 63-66%, 17-20%, 14-17% and 1.5-2.5% of the weight of the silicate modified aqueous solution respectively. A method of preparing the silicate modified polymer foam material for filling and sealing includes mixing the prepolymerized isocyanate with the silicate modified aqueous solution.

Abstract: A trenchless integrative repair method includes steps of: S1, pre-casting steel rings according to an internal diameter of a defect pipeline, and forming grouting holes in the steel rings; S2, loading the steel rings to a defect position inside the pipeline, and fitting the steel rings to an internal wall of the pipeline to form reinforcing rings; S3, selecting a number of the grouting holes according to subsidence distribution; drilling a hole in the pipeline to reach a subsidence position and inserting a grouting pipe; steadily grouting the subsidence position with a polymer grouting system, and observing a lift condition of the pipeline; removing the grouting pipe after the pipeline is lifted to a predetermined level; and S4, pulling a lining pipe into the pipeline, and fitting the lining pipe to the steel rings and pipeline walls adjacent to the steel rings; curing the lining pipe.

Abstract: A method for detecting road diseases by intelligent cruise via an unmanned aerial vehicle (UAV), the UAV and a detecting system therefor are provided. The method for detecting road diseases by intelligent cruise via UAV, wherein a road disease detection model and a road recognition model based on deep learning network are built in the UAV, wherein the method specifically comprises a step of: automatically flying the UAV on a predetermined route on the actual road determined by the road recognition model, and obtaining road disease test results by the road surface disease detection model. The present invention adopts the road recognition model and road disease detection model based on deep learning network, which can realize automatic cruise and automatic road disease detection, only need to set a predetermined route or area range, which is convenient and fast.

Abstract: A support tool for leakage repair of an inspection well includes: a curved loading plate having multiple grouting holes thereon, a telescopic adjustment device, and a base; wherein: one end of the telescopic adjustment device is connected to an inner side face of the curved loading plate, and the other end of the telescopic adjustment device is connected to the base; the telescopic adjustment device adjusts a distance between the curved loading plate and the base. The support tool is firstly hoisted at a leakage position of the inspection well; then a telescopic length of the telescopic adjustment device is adjusted, so that the curved loading plate and the base are in a close contact with opposite sides of the inspection well wall; and a grouting system is used to inject a double-slurry quick-setting repair material into a grouting pipe on the curved loading plate for plugging leakage.

Abstract: A method for constructing an assembled recyclable rectangular working well with preset detachable door openings comprises steps of: (I) designing according to functional requirements for a rectangular working well; (II) constructing by supporting piles; (III) installing prefabricated top beam; (IV) edge protection construction; (V) alternate construction of earthwork excavation, retaining slabs and internal support breast beams; (VI) installing the ladder entering the rectangular working well; (VII) rectangular working well back cover; (VIII) demolition of the detachable subsection support piles in the door part and completing the construction of the assembled recyclable rectangular working well in the preset detachable door hole; (IX) after the operation in the well is completed, during the backfilling process of the rectangular working well, gradually recovering the working well components such as the retaining slab, the internal support girder, the prefabricated crown beam and the supporting piles.

Abstract: A in-service repair method combing externally bonded pre-stressed FRP and polymer grouting for PCCP with broken wire, includes excavating PCCP, supporting the PCCP, treating outer wall of PCCP, bonded an external of the PCCP with pre-stressed FRP for repairing, laying grouting pipe, backfilling and grouting for densing. First of all, excavating a PCCP pipeline to be repaired and supporting the PCCP pipeline with a supporting device, smoothing the outer wall of the PCCP pipeline at a broken wire position and applying primer, and winding the FRP around a damaged portion of the PCCP pipeline, pre-stressing the FRP by applying a pre-stressing device and applying dipping glue to the FRP after tension to stick the FRP on the pipe wall, then laying a grouting pipe, backfilling the pipeline repaired, and finally injecting polymer into the soil after backfilling and compacting the soil by the grouting pipe pre-buried.

Abstract: A method for detecting and repairing external diseases of a buried drainage pipeline includes steps of: S1, controlling a robot to enter the pipeline to perform comprehensive detection of pipeline diseases; S2, analyzing detected pipeline diseases with a computer terminal based on detection results of the robot, and determining locations of external diseases of the pipeline; S3, controlling the robot to detect a depth of the external diseases of the pipeline relative to a ground surface; S4, determining a projection position of the external diseases of the pipeline on the ground surface according to detection results of the step S2, and drilling a hole from the ground surface; determining a drilling depth according to detection results of the step S3, and inserting a grouting pipe; and S5, grouting and repairing the external diseases of the pipeline through the grouting pipe.

Abstract: A thin-slotting lifting synchronous grouting device and its usage method are provided. The device includes a hollow force-bearing column through which a feeding pipe passes; wherein: left and right cutting plates are respectively fixedly arranged on each side of the hollow force-bearing column; a left connecting plate is fixedly arranged on an outside of the left cutting plate; a right guiding column is fixedly arranged on an outside of the right cutting plate; center lines of the left connecting plate, the right guiding column and the hollow force-bearing column are in a same plane; a top end of to the feeding pipe is connected to a grouting device, and a bottom end is connected to a spraying device; a spraying nozzle of the spraying device stretches out along the hollow force-bearing column; and a lower end of the hollow force-bearing column is connected with a disposable conical head.

Abstract: A track-type shotcrete integrated system includes: a proportioner working bin, a storage bin, a power bin, and load-bearing legs, wherein bottom sections of the load-bearing legs are equipped with a track chassis for moving, and the track chassis is electrically connected to a track controller; the storage bin contains a storage tank I and a storage tank II for storing different raw materials; a feed pump I is installed on a top of the storage tank I, and a feed pump II is installed on a top of the storage tank II; inlet pipes of the feed pump I and the feed pump II insert into the storage tank I and storage tank II respectively, and outlet pipes of the feed pump I and the feed pump II are connected to a feed pipe I and a feed pipe II respectively.

Abstract: A method for segmentation of underground drainage pipeline defects based on full convolutional neural network includes steps of: collecting a data set of the underground drainage pipeline defects; processing the data set of the underground drainage pipeline defects; optimizing with a semantic segmentation algorithm; adjusting model hyperparameters; training a model; verifying the model; and testing the model. The method adopts a deep learning algorithm, optimizes the FCN full convolutional neural network, develops a semantic segmentation method suitable for complex and similar defect characteristics of underground drainage pipelines, and adopts real underground drainage pipeline defect detection big data, thereby realizing pixel-level segmentation of the underground drainage pipeline defects and providing better robustness and generality. The detection accuracy and efficiency of the underground drainage pipeline defects are effectively improved.