771 results about "Railway tunnel" patented technology

The invention relates to the technical field of railway tunnel construction, specifically a digging method of IV and V-class surrounding rock railway tunnel with large cross section, aiming to solve the problems of the existing railway tunnel digging method including narrow operation space, low work efficiency, inflexible construction method, instable construction progress, high deformation potential of surrounding rock, and inconvenient operation. The method comprises performing leading support, digging arc-shaped pilot tunnel and preserving core soil; staggeredly digging left / right side walls of middle sidestep and preserving core soil; staggeredly digging left / right side walls of lower sidestep and preserving core soil; sequentially digging upper, middle and lower sidesteps and preserving core soil; and digging inverted arch and carrying out preliminary support. The invention has large construction space and high work efficiency, and can perform multi-job parallel operation. When the geologic conditions are changed, the invention can be flexibly and timely converted to other construction method. Preservation of core soil and left / right staggeredly digging are helpful to the stability of the digging working face. When the surrounding rock has large deformation, the invention can adjust closure time as soon as possible under the prerequisite of assuring safety and meeting requirements of clearance cross section.

The invention discloses a shield construction method of digging three parallel tunnels under a trunk railway, which belongs to the field of tunnel construction technology. The construction method of the invention comprises the procedure that: the model analysis on each construction sequence and method is made by a three-dimensional finite element and the shield construction sequence is selected; to select the reinforcement project of the railway bed is selected according to the influence degree of the dynamic stress, the load-carrying structural model is adopted to calculate and decide the shield area reinforcing bars enhancement project under the dynamic load of the railway train; the construction parameters are selected according to the test results and the performance of the shield machine, the front earth pressure is reasonably set , the synchronizing mortar injection is enhanced, the forward digging speed and the axis deviation are strictly controlled, the secondary mortar injection is made, the foam or mud is filled by utilizing a pre-embedded injection hole; the strict monitoring measures to monitor the shield construction process is adopted so that the construction unit can adjust the construction parameters in time and guarantee the construction safety. The invention not only guarantees the construction quality and the construction safety of the project but also creates good economic benefit.

A full-face vehicular detection method for a railway tunnel lining and a device aim to avoid collision of ground penetrating radar antennas with an overhead line system and a support of the overhead line system, the detection speed is a normal running speed of a train, the antennas in full-face detection are not interfered with each other, automatic positioning is realized during detection, only ground penetrating radar signals in a tunnel need to be acquired, and a penetrating radar signal processing and analyzing method in tunnel detection is modified. The vehicular device comprises a six-channel high-speed scanning penetrating radar, a positioning portion, a laser ranging portion and data acquisition and processing software. The pulse repetition frequency of the ground penetrating radar is 3MHz, the pulse repetition frequency of each channel is 500kHz, and the scanning rate is 976scan / s. The ground penetrating radar is provided with TEM (transverse electric and magnetic field) short-horn air coupled antennas, each group of antennas realizes a double-transmission and single-receiving function, and the center frequency of the antennas is 300MHz. The ground penetrating radar antennas are mounted outside passenger train connectors, radiation surfaces of the antennas respectively face to an arch crown, arch springing and side walls, and the full-face vehicular detection method and the device are used for automatically detecting to exam the railway tunnel lining.

The invention belongs to the technical field of tunnel detection of railway engineering systems and particularly relates to a method and a rail vehicle for full-section comprehensive detection of railway tunnels. The rail vehicle comprises a rail vehicle floor board, a cab and a carriage. Line-scan cameras are arranged on an arch frame which is arranged on the rail vehicle floor board, air-coupled shield antennas, and a GPS (global positioning system) mainframe, ground penetrating radar and infrared thermal imagers are arranged on the rail vehicle floor board. A GPS receiver is arranged at the top end of the cab, a laser scanner is arranged at the tail of the top plate of the carriage, and an industrial personal computer is arranged in the carriage. By multiple detection systems, one-time full-section detection of tunnel lining states and tunnel bottom damages can be realized, high detection accuracy, high efficiency, shortening of maintenance time and saving of maintenance cost are realized, influences on normal transportation of the railway tunnels are low, and loss caused by stopping of transportation is reduced.

The invention provides a fire simulation experiment system for a rail tunnel rescue station. The system comprises a simulation tunnel, a simulation rescue station platform, a simulation railway train, a smoke exhaust system, a fire monitoring system, a fire suppression system and a fire parameter measurement system. By the experiment system, the research of a series of basic theory problems and engineering practice problems of fire development, smoke flow, fire monitoring and suppression and the like generated when the fire of the tunnel rescue station is positioned on the top of a carriage, inside the carriage and at the bottom of the carriage can be comprehensively carried out. By the system, a whole set of solution is provided for the research on the effectiveness of a fire monitoring and suppression technology and a smoke control technology under the condition of different longitudinal wind speeds and the evolution law of characteristic parameters such as a temperature field, a poisonous and harmful gas concentration field, thermal radiation and the like in the scene that a train in an extra-long railway tunnel is stopped at the rescue station in the fire process.

The invention discloses a construction treatment method of a filling karst tunnel. The construction treatment method comprises the following steps that (a), a karst development control factor and a development principle are sought; (b), karst detecting is conducted for advance geology forecast; (c), analysis of influence of filling karst on stability of tunnel surrounding rocks is conducted; and (d), filling karst treatment is conducted. According to the construction treatment method of the filling karst tunnel, filling karst advance geology forecast, pre-reinforcement measures and the normal construction technical process of the tunnel are organically combined, and the safety risks of filling karst section tunnel construction are reduced or avoided by sufficiently using the means and methods such as advance geology forecast and pre-reinforcement. The construction treatment method is applied to tunnel filling karst construction of highways and railways, and meanwhile, the construction treatment method has imitative and referential significances on construction of the railways, the highways, municipal administrations and hydraulic tunnels (caves) with similar geological conditions.

The invention relates to a method for rapidly detecting cracks of a tunnel lining. The method comprises the steps that the surface of a tunnel is scanned by a vehicle-mounted CCD camera to obtain a crack image and the image is transmitted to an image acquisition card in real time; data of the crack image are transmitted to a computer by the image acquisition card; image discriminatory analysis processing is conducted on the data of the image by the computer, and therefore tunnel crack information is obtained, wherein the tunnel crack information comprises the positions, the lengths, the widths and the shapes of the cracks. The method is suitable for a road tunnel and a railway tunnel through different vehicle-mounted platforms and the application range is wide. Detection is conducted on the vehicle-mounted platform with the speed larger than 60km / h, an ideal detection result is obtained, and therefore detection cannot interfere in normal traffic in the tunnel. Fully-automatic data acquisition and processing are adopted, manual interference is not needed, detection speed is high, accuracy is high, and cost is low. The method is large in economic value and social value in the technical field of tunnel crack detection and is worthy of wide popularization and application.

A process for constructing highly accurate three-dimensional mappings of objects along a rail tunnel in which GPS signal information is not available includes providing a vehicle for traversing the tunnel on the rails, locating on the vehicle a LiDAR unit, a mobile GPS unit, an inertial navigation system, and a speed sensor to determine the speed of said vehicle. A stationary GPS, whose geolocation is well-defined, is located near the entrance of the tunnel. Image-identifiable targets having a well-defined geodetic locations are located at preselected locations within the tunnel. The vehicle traverses the tunnel, producing mass point cloud datasets along said tunnel. Precise measurements of 3D rail coordinates are also obtained. The datasets are adjusted based on the mobile GPS unit, the inertial navigation system, the speed sensor, the location of the image-identifiable targets, and the precise measurements of 3D rail coordinates, to thereby produce highly accurate, and substantially geodetically correct, three-dimensional mappings of objects along the tunnel.

The invention relates to a security risk assessment and early warning method for a high-speed railway tunnel during operation period. The method comprises the first step of constructing an evaluationbasis, including a risk rating assessment standard, an evaluation index system and an early warning mechanism establishment: the risk rating assessment standard includes a risk possibility assessmentstandard and a risk consequence severity rating assessment standard. The risk rating assessment is based on the risk probability rating as the ordinate, and the risk consequence severity rating as theabscissa to construct a risk assessment matrix. The evaluation index system is established by the hazard factors of the four aspects of "human- things-management-environment ", and constructs the risk probability membership function of the hazard factors. The early warning mechanism is established by four-color early warning. The second step of risk rating assessment is quantitatively calculatedbased on the membership function and the second-level fuzzy comprehensive evaluation model, and conducted combining the risk consequence severity rating assessment standard and the risk rating assessment matrix. The third step of determining the early warning rating: obtained by coupling the superposition analysis risk rating and the early warning indicator risk rating. The beneficial effects of the security risk assessment and early warning method for a high-speed railway tunnel during operation period are that the evaluation results are quantified, and the decision is based on science.

The invention discloses a construction method of a railway tunnel, and particularly relates to a construction method for a composite stratum with the hard top and the soft bottom of a large-section tunnel. The method includes excavation construction; initial-stage supporting; and inverted arch and lining construction. When the thickness of a hard surrounding rock on the upper portion of a working surface of the tunnel is smaller than 2m in an excavation construction process, the excavation construction method is a three-step seven-pace method; and when the thickness of the hard surrounding rock on the upper portion of the working surface of the tunnel is larger than 2m, the excavation construction method is a three-step method. The construction method has the advantages of fast construction progress, high safety and fine construction economical efficiency.

The invention relates to the field of tunnel blasting, in particular to a method for blasting a shallow section of a modernization railway tunnel. The method includes the steps that houses around a blasting position are firstly assessed; arrangement positions of shot holes are then determined, and a full fracture surface is divided into a left blasting area and a right blasting area; charge structures of all the shot holes are determined; time for delay initiation, shot hole charge quantity and explosive kinds are determined; an underholing method, the distance between periphery holes and the least resistance line of the periphery holes are selected according to the characteristics of surrounding rock on site, the various shot holes are machined on the full fracture face according to the data determined in the step two, and explosive is installed according to the data determined in the step three; blasting is performed according to the blasting area partition sequence of cutholes-satellite holes-periphery holes-bottom plate holes, the satellite holes perform layer-by-layer blasting from inside to outside, and same-section millisecond blasting caps are adopted for initiation of the periphery holes. The purpose is to provide the method for blasting the shallow section of the modernization railway tunnel, wherein blasting influence can be reduced stably when the shallow section of the tunnel is blasted.

The invention relates to a large-section water-rich saturated fine sand railway tunnel excavation method. The method includes the following steps that firstly, pilot tunnels of double side walls are constructed in the lower half section of a positive hole of a tunnel in advance and are excavated with sub-steps, temporary inverted arches are arranged on the pilot tunnels respectively, rings are formed in a sealed and segmented mode, and sub-steps are used for carrying out look-ahead dewatering and drainage on the pilot tunnels; secondly, a method that an arc pilot channel is used for reserving core earth is used for excavating the upper section of the positive hole of the tunnel, the core earth is used for stabilizing a tunnel face, arc excavation is performed in place at a time, the positive hole primary supporting steel frame is spliced in place at a time, the temporary inverted arches and a middle partition wall which are next to the tunnel face are constructed to make an upper portion supporting structure form a ring in a sealed mode, the sub-steps are manually cut to excavate the core earth, an overall positive hole primary supporting lagging jack structure is rapidly established, the inverted arches are cast and concrete filling can be carried out in time; thirdly, a result is analyzed according to monitoring measurement data, the inner side wall in the hole, the temporary inverted arches and the middle partition wall are detached in a segmented mode and a composite lining is constructed in time. By means of the method, the construction problem that the self stability of the fine sand is poor and the fine sand rapidly deteriorates when encountering water and surges outwards like quicksand is solved.

The invention discloses a lining platform car of the single-thread railway tunnel, which contains the arched mould including the roof and side follow boards, the bracket with a lifting cylinder, the gantry and the supporting component of the arched mould. It is characterized in that: the roof follow board contains the left and right roof follow boards in bilateral symmetry. There is an adjusting roof follow board for changing the sectional width between them. The side follow board contains the detachable upper and lower side follow boards. A side adjusting follow board for changing the sectional height and radius can be added between them. With the adjusting roof follow board and the side adjusting follow board, the sectional size of the arched mould can be adjusted in certain range to adapt the tunnel engineering with different sections. It can reduce the engineering cost, lighten the working strength and improve the working efficiency.

The invention provides a construction method of railway tunnel lining side wall concrete. Firstly concrete for an inverted arch and the inner part of the inverted arch is constructed, then sleepers are placed, and a lining trolley traveling track is laid; a lining trolley is moved to a place to be lined, molding boards are connected to the top of a gantry, and end of hydraulic oil cylinders and jacks at two sides; the side hydraulic oil cylinders at two sides are started to regulate the molding boards at two sides of the lining trolley to the design positions, and all side jacks are locked to fix the side molding boards; short side wall molding boards at two sides of a tunnel are respectively mounted, the upper end heads of the short side wall molding boards are connected with the lower ends of arc-shaped molding boards at two sides to form a molding board assembly, and the molding board assembly is mounted at one end of the jack on a water groove side wall to be mounted with one side of the short side wall molding board; and then the concrete is cast and lined, and the cast lined concrete is dismounted with the mold after reaching the strength of mold removal. The construction method reduces procedures and shortens the erection time, saves the construction cost, and enhances the structure of the tunnel lining side wall and improves the external quality.

The present invention discloses a tunnel lining crack recognition method and system based on a gradient inter-class threshold algorithm. The method comprises: (1) denoising a tunnel crack image; (2) using a gradient inter-class threshold algorithm to carry out binarization processing on the denoised image, carrying out edge detection on the obtained binarized image, and calibrating the fracture index; and (3) carrying out morphological processing on the binarized image to remove the noise of the crack itself and fill the internal void, and carrying out crack index extraction on the filled image. The system comprises an image enhancement module, an edge detection module, and a crack recognition extraction module that are connected in sequence. The tunnel lining crack recognition method andsystem based on the gradient inter-class threshold algorithm provided by the present invention has a good recognition effect for the tunnel lining crack images with huge processing amount and multi-interference, and is applicable to the automatic detection of the lining of the high-speed railway tunnel skylight period.

The invention relates to a railway tunnel rescue station fire experiment system comprising a plurality of evacuation transverse passages. The railway tunnel rescue station fire experiment system comprises an experiment tunnel main body and a data measuring system. The experiment tunnel main body comprises a fire tunnel, evacuation transverse passages, a non-fired tunnel, a train model, a fire source and a smoke evacuation system. The fire tunnel is communicated with the non-fired tunnel through the evacuation transverse passages. The train model, the fire source and the smoke evacuation system are arranged in the fire tunnel. The fire experiment platform comprises nine evacuation transverse passages. By blocking different numbers of evacuation transverse passages, fire experiment research of railway tunnel rescue stations with different numbers of evacuation transverse passages is realized. The experiment platform is relatively wide in application range and is capable of combining fire scenes different in number of rescue station evacuation transverse passages, fire position, smoke evacuation mode and ventilation condition, so that the analysis research work of a plurality of railway tunnel rescue station fire scene experiments under practical conditions are realized, and the railway tunnel rescue station fire experiment system is wide in application prospect and has important guiding significance.

The invention discloses an inside and outside general bridge girder erection machine for a high speed railway tunnel and a girder erecting technology thereof. Double girders (3) of the bridge girder erection machine are provided with two smooth hanging girder crown blocks (2); the front ends of double girders (3) are provided with front landing legs (4) and assistant landing legs (5); the tail parts of the double girders (3) are provided with rear landing legs (1) which can tilt and can support on the girders at two sides of a concave-volume tyre girder transportation car (6) after falling down; and the feet of the rear landing legs (1) are provided with travelling mechanisms which travel along the rails of the upper cover plates of girders (6-6) at two sides of the concave-volume tyre girder transportation car (6). The bridge girder erection machine feeds girders in a rear cantilever type, passes through holes in a front cantilever type, and transfers, packs and travels among bridges. The inside and outside general bridge girder erection machine can finish girder erection operation in and out of the high speed railway tunnel, can change the traditional bridge erection process into the simple bridge erection process, and has the advantages of high bridge girder erection efficiency, reliable safety performance and the like. Thus, the inside and outside general bridge girder erection machine solves the bottleneck problem for erecting prestressing force box-type concrete girders when the high speed railway is built in mountainous areas.

The invention discloses a method for automatically designing and optimizing a railway vertical profile. The method comprises the steps of carrying out ground line smoothening processing to an original ground line, fitting an initial slope to the smoothened ground line, carrying out vertical profile design constraint condition processing to the initial slope, forming a vertical profile automatic slope design scheme, optimizing the vertical profile based on a differential evolution algorithm, setting optimization control parameters, initializing the populations according to the vertical profile automatic slope design scheme, using a target function to assess the advantages and disadvantages of the individual vertical profile scheme, calculating an individual target function value, carrying out evolution among the populations by using a mutation operation, an interlace operation, a restoring operation, setting of railway tunnel and a selecting operation until the final evolution condition is reached, and outputting a vertical profile diagram and a standard check table. The method for automatically designing and optimizing railway vertical profile has the advantages of high automation degree, strong practicality, fast computing speed, and high promotion and application value in design and optimization of the railway vertical profile.

The invention discloses a blast construction method of a shallow-buried railway tunnel in underneath pass of civil house weak segments. The method includes the following steps that a, according to characteristics of the shallow-buried railway tunnel in underneath pass of the civil house weak segments, a numerical value model is established; b, material parameters corresponding to the numerical value model of the shallow-buried railway tunnel in underneath pass of the civil house weak segments are selected; c, blasting simulation of the shallow-buried railway tunnel in underneath pass of the civil house weak segments is performed; d, numerical value simulation results of different cutting blasting modes are analyzed; e, in combination with engineering measured data of blasting constructionfor the shallow-buried railway tunnel in underneath pass of the civil house weak segments, verification is performed so that the demands of blasting safety vibration control standards can be met. By the utilization of a power finite element method, numerical value simulation analysis is performed to research the rule of a blasting seism, verification is performed in combination with the engineering measured data, and therefore blasting vibration is reflected accurately to a certain degree. The blasting vibration reduction effect of a vibration reduction technical scheme is researched, bases are provided for making a vibration reduction blasting scheme for the tunnel in underneath pass of dense civil houses, and influences on the rule of seismic wave propagation by excavation of the tunnelare researched.

The present invention discloses a rapid detection system of a railway tunnel lining surface disease. The system comprises: an image rapid collection unit S1 configured to collect lining section imagesP1-Pn; a section scanning unit S2 configured to convert an overall dimension to first space coordinates (x, y) corresponding to a plurality of pixel points in the lining section images P1-Pn; a mileage and synchronization unit S3 configured to send synchronization triggering signals to the image rapid collection unit S1 and the section scanning unit S2 to allow the two to perform sampling based on a travel distance and obtain mileage data z; a compensation unit S4 configured to obtain a relative displacement d and a deflection angle [Alpha] of a vehicle body relative to an initial state in aprocess of detection of vehicle travel; and an image processing unit S5 configured to form a three-dimensional tunnel lining surface image having geometrical characteristics and spatial positions of diseases. The detection system provided by the invention is convenient to install and high in resolution, can perform correction of a measurement value and can observably improve the tunnel lining surface disease detection efficiency.

The invention discloses an automatic punching device and method for high-speed railway tunnel anchor implantation and solves problem that health of construction staff is damaged, punching accuracy is poor in anchor implantation, construction efficiency is low and security of the construction staff cannot be guaranteed in existing tunnel anchor implantation. Each of the front end and the rear end of a hydraulic life truck is provided with a support leg, each support leg is provided with a support ball head and a winch, each of the front end face and the rear end face of a lift platform is provided with a hydraulic telescopic rod, each of the upper and lower ends of a frame-type housing is provided with a horizontal chute, a fixing pillar is vertically arranged in the two horizontal chutes, a horizontal servo motor and vertical chutes are arranged in the fixing pillar, each of the vertical chutes is provided with an electric hammer, vertical servo motors are arranged under the electric hammers, a gravity sensor and a laser range finder are arranged at the lower end of the frame-type shell, and a radar range instrument is arranged at the upper end of the frame-type shell. By the arrangement, working accuracy is greatly improved, and danger coefficient in construction is reduced.

The invention discloses a railway tunnel construction progress management system based on 3DGIS and an engineering 3D model. The system comprises a user management module, a practical progress data collection module, a construction group planning module, a 3D image progress display module, a statistical analysis module, a progress early-warning module and a log recording module; the practical progress data collection module has data filling, data checking and warehousing functions; the construction group planning module can make and record plans of a construction group of a construction site; the 3D image progress display module has 3D scene introduction, tunnel construction site model introduction, 3D roaming and progress display functions; the statistical analysis module can make statistical analysis on progress data and output a statistical report; the progress early warning module has early-warning staff configuring and short message prompting functions; and the log recording module can record user login information, progress filling information and checking information in real time. According to the invention, elaborate and 3D visualized management of the railway tunnel construction progress can be realized.

The tunnel invert form board trolley, it belongs to the technology field of tunnel construction equipment. It includes the resist float platform, front walk wheel, back walk wheel, lift front, back supporting seat, cancelled structure trolley frame which contains column, the foundation frame of trolley and the invert form board set below the foundation frame of trolley, the said front, back supporting seat. And the front, back walk wheel are set in the end of the foundation frame of trolley, the resist float platform is set in the top of the invert form board, the said walk wheel are lift walk wheel, the said foundation frame of trolley is set above the invert form board by a float device. The merit is that the structure is simple, the cost of manufacture is low; the construction of the invert arch as well as upkeep and other work such as tunneling, slag, transportation can be in synchronously progress, and placing quality is not effected by the shocking of the vehicle. It is specially applied to the placing construction of long and big railway tunnel invert.

The present invention relates to a mobile air curtain type tunnel smoke-repelling dust-removing method and its equipment. It is characterized by that in the tunnel interior an air curtain which is formed from pressure air stream and can be moved along tunnel section direction is made up. Said air curtain has the functions of repelling smoke and collecting dust. Said equipment includes motor vehicle, air curtain generation ring tube fixed in the front portion of motor vehicle, air supply mechanism communicated with air curtain generation ring tube and dust-collecting mechanism.

The invention relates to the technical field of railway tunnel environmental protection, in particular to an urban subway tunnel cleaning trolley, which mainly comprises a flat trolley, a control part, a dust absorption part, a sweeping part and a water flushing part, wherein the control part, the dust absorption part, the sweeping part and the water flushing part are orderly arranged on the flat trolley; one end of a filter-bag dust remover installed at the middle front part of the flat trolley is communicated with the air inlet of a centrifugal fan through a metal pipeline and an autothrottle; the other end of the filter-bag dust remover is communicated with a draught distributing box, which is provided with regular through holes, connected with a control air valve and provided with dust absorption ports on the periphery of the cross section; a dust deposit bucket on the lower part of the filter-bag dust remover is provided with a plurality of spiral conveyers longitudinally; the conveyers are connected with a motor reducing gear through chains and chain wheels to form the dust absorption part; the air inlet end of an air storage tank installed at the middle rear part of the flat trolley is communicated with a high-efficiency screw type air compressor, and the air outlet at the other end is communicated with a high pressure seamless pipe, which is connected with an angle-adjustable TB slot type structure air injection nozzle, an electromagnetic regulating valve and a manual pressure relief valve to form a sweeping part; and the water inlet end of a plunger type high-pressure water pump installed at the middle rear part of the flat trolley is communicated with three water tanks installed on the upper part of the flat trolley, and the other end is communicated with two high-pressure water jets arranged at the rear end part of the flat trolley to form the water flushing part. The invention has various advantages is suitable for various railway tunnels.

The present invention relates to a vehicle railway tunnel vault geological radar continuous detection system. The system comprises an engineering vehicle, a workbench, a hydraulic elevating platform, a tunnel section laser detection mechanism, a vault brace rod mechanism and a vault radar antenna detection mechanism. A brace rod main body in the vault brace rod mechanism has two brace rod arms, the two brace rod arms are connected through a brace rod arm regulation pin shaft, and the hydraulic elevating platform and a brace rod driving motor are employed to drive the two brace rod arms to realize two-degree-of-freedom elevating and rotation to allow a radar antenna in the vault radar antenna detection mechanism at the top end of the brace rod main body to be extended into all the gaps between the inner wall of the tunnel vault and a contact net and scan each area of the vault required being detected to allow the detection blank area of the tunnel vault to be reduced to nearly zero. The system performs cooperation motion among mechanisms when detection, the radar antenna can avoid obstacles such as the contact net and the like, the frequent and rapid elevation of the vault brace rod mechanism and the like is reduced, the control is simple, the reliability is high, the continuous detection is realized, and the detection efficiency and the quality are improved.

The invention relates to a high-speed railway tunnel structure state evaluation method. The method mainly comprises the following steps of 1) establishing a three-stage evaluation factor set of high-speed railway quality and numbering each factor; 2) by combining an analytic hierarchy process with an extensible evaluation method, determining a weight of each evaluation factor; and 3) determining a comprehensive result of influence of all factors on a high-speed railway tunnel structure by adopting a three-stage fuzzy comprehensive evaluation method. In combination with actual engineering examples, the rationality and applicability of the evaluation method are verified; and the method can provide theoretical support for scientific management of high-speed railway tunnels in an operation period at the present stage.

The invention discloses a pre-paved type polyolefin self-adhering film waterproof sheet and a preparation method thereof. The pre-paved type polyolefin self-adhering film waterproof sheet is composed of two layers of structures, namely, a polyolefin waterproof sheet and a self-adhering glue layer, wherein the polyolefin sheet is prepared from the following raw materials in parts by weight: 65-85 parts of polyethylene, 10-25 parts of thermoplastic elastomer, 5-10 parts of polyethylene grafting materials, 3-8 parts of a modified tackifier, 0.2-0.6 part of titanium dioxide and 0.1-0.5 part of an antioxidant. The preparation method comprises the following steps: mixing according to the raw material ratio of the polyolefin waterproof sheet, fusing, extruding and forming the polyolefin sheet, and then compounding one self-adhering glue layer onto the sheet. The polyolefin self-adhering film waterproof sheet prepared according to the method has the advantages of excellent physical and mechanical properties, excellent waterproof property, moderate softness, excellent workability, safety, environmental protection and excellent peeling strength of self-adhering glue layer and post-poured concrete. The pre-paved type polyolefin self-adhering film waterproof sheet prepared according to the method provided by the invention can be used for waterproof purpose of railway tunnels.

The invention provides a construction method of a large-span asymmetrical double-arch railway tunnel under a terrain bias pressure condition. The method is used for greatly shortening construction period and improving construction efficiency by simplifying construction steps. In the construction method, a middle pilot tunnel, an inside tunnel chamber and an outside tunnel chamber are sequentiallyexcavated, and unbalanced support systems are adopted in the inside tunnel chamber and the outside tunnel chamber, which effectively controls deformation of the top part of a middle partition wall and arch parts of the big main tunnel chamber and the small main tunnel chamber as well as side walls (the maximum deformation is controlled within 20mm), greatly shortens construction period, simplifies construction steps, improves construction efficiency by 30%, and the problem of water leakage on the top part of the middle partition wall is effectively solved.

A precision rod type convergence gauge comprises anchor heads which are respectively fixed at two ends of a measured distance, a universal hook and a tubular connecting rod; the precision rod type convergence gauge also comprises a micrometer caliper, wherein one end of the micrometer caliper is connected with an extracting-pulling type distance-measuring gauge and the other end is connected with a pull rod benchmark device which consists of a telescopic rod fixed with the micrometer caliper into a whole, a force-measuring spring guide sleeve matched with the telescopic rod and a limit spring. The connecting part of the force-measuring spring guide sleeve and the micrometer caliper is provided with a benchmark window marked with a benchmark line; the ends of the pull rod benchmark device and the extracting-pulling type distance-measuring gauge can be respectively connected with a plurality of sections of tubular connecting rods by threads; and an alignment line which can be aligned to the benchmark line of the benchmark window is arranged on the telescopic rod. The precision rod type convergence gauge is applicable to the stability monitoring of military caves, railway tunnels, bridges, underground hydraulic buildings and mine tunnel chambers, and the deformation observation of earth structures. The precision rod type convergence gauge has the advantages of the structure convenient for observation, high precision, combination of a plurality of sections of measurement rod and strong adaptability.