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2383results about How to "Construction safety" patented technology

Carst region double-arch road tunnel construction method

The invention discloses a carst region double-arch road tunnel construction method, which comprises the following steps; 1. carrying out construction preparation; 2. carrying out construction at channel openings; 3. adopting a three-pilot-tunnel method for constructing the channel inlet opening section, and adopting a step digging method for digging during the three-pilot-tunnel method construction; 4. adopting a middle-pilot-tunnel method for constructing the middle communication section of the channel, and adopting a full cross section method for digging during the middle-pilot-tunnel method construction; 5. adopting the three-pilot-tunnel method or the middle-pilot-tunnel method for constructing the channel outlet opening section, adopting the step digging method for digging when the middle-pilot-tunnel method is adopted for digging construction of the channel outlet opening section, and synchronously carrying out secondary lining construction from the front part to the back part in the digging construction process of the channel inlet opening section, the middle communication section of the channel and the channel outlet opening section. The invention has the advantages of reasonable design, simple and convenient construction, safe and reliable construction process, flexible construction mode, short construction period and greatly simplified construction steps, and effectively overcomes various defects during the traditional carst region double-arch road tunnel construction.
Owner:CHINA RAILWAY 20 BUREAU GRP +3

Soil pressure balancing type tunnel shielding simulation experiment system

The invention relates to a soil pressure balance type tunnel shield analog experiment system, a rectangular soil coelom with the upper part provided with an opening is internally provided with a shield machine model and filled with a simulated soil body, the axle wire of the shield machine model is overlapped with that of the soil coelom; the upper surface of the simulated soil body is covered with a layer of concrete cushion the upper surface of which is connected with a horizontal loading beam by more than two soil pressure jacks, the horizontal loading beam is connected with the bottom of the soil coelom by an anchor rope; and the simulated soil body is also internally embedded with a soil pressure box, a grating fiber optical sensor and a displacement meter, wherein, the soil pressure box, the grating fiber optical sensor and the displacement meter are all electrically connected with a data acquisition and processing device. The system can simulate the influence of shield tunnel construction between subways of cities on the stratum and surrounding environment more conveniently, actually and effectively, and provide more actual and accurate experimental data for tunnel construction and design so as to guarantee the high-efficiency and safety of the shield tunnel construction of cities.
Owner:SOUTHWEST JIAOTONG UNIV

Multipoint synchronous push construction method for porous large-span continuous steel truss girder

The invention discloses a multipoint synchronous push construction method for a porous large-span continuous steel truss girder, which comprises the following steps of: (1) assembling a steel truss girder assembling platform and a push slideway in a shoreside bridge pier position; (2) assembling a section of steel truss girder and a guide girder on the steel truss girder assembling platform; (3) installing a vertical jack for carrying out support conversion on the steel truss girder and then installing a continuous push jack, a steel strand and an electrohydraulic integrated control system; (4) operating the electrohydraulic integrated control system for carrying out push operation on the steel truss girder; and (5) after the push operation of the section of steel truss girder is finished, continuously assembling the steel truss girder on the steel truss girder assembling platform, carrying out next push operation, repeating the step for circulating operation and finishing the push construction of the porous large-span steel truss girder. The invention has the advantages of short construction period, safe construction, quality guarantee, low cost, and the like, realizes the push operation of the large-span steel truss girder, saves the construction cost, and reduces the pollution to a river channel.
Owner:1ST ENG OF CHINA ZHONGTIE MAJORBRIDGE GROUP +1

Automatic driving system and method of water conservancy construction vibration roller

The invention provides an automatic driving system and method of a water conservancy construction vibration roller. The system comprises a remote monitoring device and an onboard automatic control device. The remote monitoring device plans working areas and navigation routes according to 3D digital model man-machine interaction of construction projects, receives data like position, speed and rotation direction of the roller and working environment video information in a wireless communication manner and sends automatic navigation data and instructions to the onboard automatic control device. The remote monitoring device can also remotely control the roller based on received emergent processing requests in a man-machine interaction manner. The onboard automatic control device receives the automatic navigation instruction and remote control driving information sent by the remote monitoring device in real time, and compares the information sent by the onboard automatic control device with the information like position, speed and rotation angle detected by an onboard RTK-GPS and a sensor. After being adjusted via the PID algorithm, deviation is sent to execution elements like an electric steering wheel, an electric throttle and an electric brake to control the vibration roller to finish respected rolling work. According to the invention, the automatic driving system is compatible with a manual driving system.
Owner:TSINGHUA UNIV

Tunnel information tracing accurate grouting method

ActiveCN101832142AOptimizing the Number of Grouting HolesReduce the amount of waterUnderground chambersTunnel liningGlass fiberGeomorphology
The invention relates to the field of tunnel grouting, in particular to a tunnel information tracing accurate grouting method, which solves the problems of thick reinforcing ring, large number of drilled holes, long construction period and the like of the traditional curtain grouting method adopted in current tunnel grouting. The method comprises the processes of grout stopping wall building, arrangement of orifice tubes and grouting tubes, measurement of the water burst of a drill hole, packer test, hole arrangement, drilling operation and grouting, wherein the hole arrangement and the grouting are performed according to the sequence from an advance geological drill hole to other outer ring holes to an inner ring hole to a working surface stabilizing hole to an access hole to a pipe-shed hole; and steps such as advance big pipe-shed construction of a working chamber and working surface stabilization by using a glass fiber anchor rod are saved. In the invention, a break through is made in the conventional construction philosophy, grouting design and geological change are tightly combined together, a grouting mechanism of 'crack blocking, water reduction, surrounding rock fixation and stratum stabilization' is adopted, the grouting holes are reduced by 30 to 40 percent, grouting quality is improved, the safe and quick construction is guaranteed, major water burst and mud burst accidents are eliminated, and the environment is protected maximally.
Owner:CHINA RAILWAY 12TH BUREAU GRP

Construction method for integrally sliding large-span steel pipe arch of curved bridge

The invention relates to a construction method for integrally sliding a large-span steel pipe arch of a curved bridge, belonging to the field of bridge engineering construction. The method comprises the following steps: firstly, carrying out on-site splicing and welding on the manufacturing and installing sections of a steel pipe arch to form a large hoisting section; then installing a temporary arch-splicing support on a bridge-site longitudinal splicing site position, arranging arch ribs on the temporary arch-splicing support, and adopting an arch springing restraint device to preload arch springings after finishing splicing the steel pipe arch, thus enabling the steel pipe arch to form a stressed entirety; and finally, dismantling the temporary arch-splicing support, and adopting a pushing power system to realize integrally sliding the whole steel pipe arch into a proper position. The construction method of the invention has the advantages of small site occupation, integral hoisting of large sections, less hoisting subsection and less arch-splicing support amount, thus the construction cost is economical, the high-altitude welding quantity is less, the welding quality is ensured, the arch axis linetype control is easy, the steel pipe arch splicing and a concrete beam can be simultaneously constructed, arch splicing is carried out on an ectopic bridge site, the underbridge navigation is not influenced, the construction is safe and the construction progress can be quickened.
Owner:CHINA FIRST HIGHWAY ENG +1

Electromagnetic shielding coating material and preparation method thereof

The invention provides an electromagnetic shielding coating material. The electromagnetic shielding coating material comprises 40-70% of liquid metal, 10-40% of a conductive filler, 5-15% of a magnetic shielding filler, 0.5-2% of a coupling agent, 1-10% of a binder, 0.5-2% of a toughening material and 0.5-2% of a wetting dispersing agent, wherein the liquid metal is low-melting-point metal with the melting point of 300 DEG C or below or a conductive nanofluid formed by mixing low-melting-point metal nanoparticles with a fluid dispersant. For the first time, the concept of taking the liquid metal as a conductive auxiliary binder and a conductive auxiliary flow aid is put forward and implemented, and the liquid metal replaces a non-conductive solvent and a non-conductive binder to form the electromagnetic shielding coating material system. Besides, the electromagnetic shielding coating material neither contains any toxic or harmful substances nor produce any volatile organics, is high infilm forming speed, has the characteristics of being safe and environmentally friendly, convenient to construct and low in cost, and can be widely applied to a plurality of fields including militaryscience, electronics, aerospace, buildings and the like.
Owner:BEIJING DREAM INK TECH CO LTD

Environment-protective illumination intelligent management system

The invention discloses an environment-protective illumination intelligent management system which comprises an upper computer, an intelligent monitoring terminal, an intelligent server and a single-lamp energy-saving controller, wherein the upper computer is arranged in a monitoring center and is provided with an intelligent management software, and the functions that the remote monitoring management (remote metering, remote controlling, remote signaling, remote viewing, and remote regulating) of urban public lighting facilities, electronic map operation and management of street lamp monitoring, map direct-viewing presentation and convenient positioning of relevant facility resources of the street lamp, as well as production management, warehouse management, artificial intelligence, and the like are realized by the upper computer; the intelligent monitoring terminal actualizes the measurement and gathering of electrical parameters of the street lamp, and the control of an illumination return circuit and a branch circuit, is connected with the intelligent server, and performs communication with the upper computer through an operator public network (GPRS, CDMA); the intelligent server is connected with the intelligent monitoring terminal, performs communication with a single lamp controller through a power-line carrier mode with automatic relay, delivers the control command, and receives single lamp status data and warning data; and the single lamp energy-saving controller receives the instructions of the intelligent server, and the control of the switching, power decreasing, light adjusting and the like for the single lamp is realized, and gathers the data such as electrical parameters, state, alarming of the single lamp.
Owner:TAIHUA WISDOM IND GRP CO LTD

Construction technology of steel sheet pile cofferdam for Yellow River Channel internal support table construction

ActiveCN101838993ASolve the water stop problemReasonable designBulkheads/pilesCofferdamSheet pile
The invention discloses a construction technology of a steel sheet pile cofferdam for Yellow River Channel internal support table construction. A construction support table is an underwater support table arranged in a Yellow River Channel. The technology comprises the following steps of firstly, determining a structure and the size of a used cofferdam in the process of underwater support table construction; secondly, surveying and setting out; thirdly, constructing the cofferdam; fourthly, constructing a bored pile at the bottom of the support table; fifthly, constructing the support table: carrying out forming construction of the underwater support table on the top of the bored pile after construction when the bored pile construction is finished, and finishing integrative construction of the bored pile and the underwater support table; and sixthly, constructing a pier column at the upper part of the support table. The invention has the advantages of reasonable design, convenient construction and low construction cost, carrys out construction by adopting an integrative construction method of the support table and the bored pile and can efficiently solve the defects of long construction period, large investment, needs of setting up a plurality of construction platforms, large construction difficulty and the like in the successive construction process of the bored pile and the support table in the traditional construction process of the steel sheet pile cofferdam.
Owner:CHINA RAILWAY 20 BUREAU GRP +3

Method for forecasting advanced geology for tunnel construction

The invention relates to an advanced geological forecast method in the tunnel construction filed, comprising the following steps of: determining a hole prospecting proposal according to a middle or short term forecast and placing a radar antenna in after a hole is drilled to collect radar signals and determine whether any abnormal geologic body exists; if no geologic body exist, continuing construction; if geologic body exists, drilling again, placing a radar antenna in so as to collect signal and determine whether any abnormal geologic body exists; if no geologic body exist, continuing construction; if geologic body exists, drilling again and placing a radar antenna in so as to collect signals. Describing the spatial positions of the abnormal geologic bodies according to the signals obtained during the three times so as to provide operational geologic information for further processing. The advanced geological forecast method can be used in a wide exploration scope, can accurately forecast the abnormal spatial geologic phenomenon in front of an excavating face, provides reliable assurance for reducing collapse and rapid construction, is applicable to exploration of high resolution at deep underground and deep tunnel excavating face and is an uniquely feasible and effective exploration means to deep engineering in many cases.
Owner:CHINA RAILWAY NO 2 ENG GRP CO LTD +1

Rapid construction method of high-pressure water-rich fault zone of tunnel

ActiveCN101798930AReduce water pressure in tunnelReduce water and mud inrushUnderground chambersTunnel liningWorld classTunnel construction
The invention relates to the field of tunnel construction, in particular to a rapid construction method of a high-pressure water-rich fault zone of a tunnel, which solves a plurality of problems in the construction method of high-pressure water-rich fault zone tunnels under the guide of the traditional knowledge. A draining branch tunnel is additionally arranged between a main tunnel and a parallel heading, the water flow pressure of the hanging wall of a fault interface is reduced progressively, and a large amount of water is discharged from the main tunnel by adopting a guiding and non-clogging mode; when the water pressure of the main tunnel is reduced to 0.3-0.5MPa, an informationized tracking and accurate grouting method is used for grouting and reinforcing the main tunnel; and rapidly excavating and sealing technology is used for excavating the main tunnel and the parallel heading. The invention adopts the technology combining the water distribution and pressure reduction mode, the informationized tracking and accurate grouting method and the rapidly excavating and sealing technology for high-pressure water-rich shattered fault zones for the first time, breaks through the traditional concept that the water distribution and pressure reduction mode is opposite to the grouting and reinforcing construction method, solves the world-class problem of construction of the high-pressure water-rich fault zone of the tunnel, improves the construction progress and the construction efficiency, and ensures safe and rapid perforation of the tunnel.
Owner:CHINA RAILWAY 12TH BUREAU GRP

Shed-frame method for shallowly burying large-sized underground structure construction

The invention relates to a shed-frame method for shallowly burying a large-sized underground structure construction. A construction principle is as follows: an envelope enclosure is adopted for retaining soil and water and resisting lateral deformation; a large-diameter pipe shed is arranged to bear the load of road surfaces and stratums and protecting underground pipelines; strip foundation construction of a center pillar in a main structure is carried out in a small pilot tunnel which is excavated with a subsurface excavation method; and under the protection of a top pipe shed frame, main structure construction is carried out with a cover-and-excavation half-top-town half-bottom-up method, and the center pillar, side walls, a center plate and a top plate which are pre-constructed well are utilized for providing vertical and horizontal support systems in an excavation space. The invention aims at providing a new method for shallowly burying the large-sized underground structure construction under an urban road; and the method is reasonable and feasible in technique and strong in operability, the quality of the main structure is guaranteed easily, construction is safe and rapid, the influences on ground transportation and the dismantlement and change to underground pipelines are reduced, and the comprehensive benefits are remarkable, therefore the shed-frame method has an important engineering application value and development prospect.
Owner:BEIJING UNIV OF TECH

Long tunnel fast construction process

The invention discloses a long tunnel fast construction process. The tunnel construction method in the direction from the entrance to the exit and the tunnel construction method in the direction from the exit to the entrance are the same and each construction section is respectively constructed from back to front. The construction process is as follows: 1, excavating construction at an initial construction section, the process is as follows: performing advance geology forecast, determining the excavating construction method for the current construction section, excavating and primary supporting; 2, excavating construction at the next construction section; 3, repeating the step 2 for multiple times until the construction tunnel is through, wherein in the tunnel construction process, found water seepage areas are timely subjected to draining treatment, and the secondary lining construction is synchronously performed on the tunnel holes formed by excavating from front to back. The long tunnel fast construction method is reasonable in design, simple and convenient in construction, safe in the construction process, short in construction process and fast in construction progress, thus effectively solving the defects and shortcomings such as large equipment investment, long construction period and slow construction progress of the existing long tunnel construction.
Owner:中铁二十局集团第二工程有限公司

Method for constructing tunnel by finishing full section curtain grouting from upper-half section

The invention relates to the field of tunnel construction, in particular to a method for constructing a tunnel by finishing full section curtain grouting from an upper-half section, which solves the problems of long construction period, difficult construction, high construction safety risk and the like during full section curtain grouting construction of a complex geological section. The method comprises the following steps of: firstly, excavating the upper-half section, and strengthening the support of a tunnel face; secondly, constructing a temporary inverted arch and a grout-stopping wall of the upper-half section; thirdly, excavating the lower-half section in place, and strengthening the support of the tunnel face; fourthly, constructing a grout-stopping wall of the lower-half section; fifthly, forming grouting holes on the upper-half section, wherein the maximum elevation angle alpha is between 25 and 45 degrees, the maximum depression angle beta is between 30 and 70 degrees, andthe longitudinal strengthening length is between 15 and 30 m; sixth, performing grouting operation; seventh, constructing a large-scale lead pipe roof; eighth, excavating a grout-stopping wall; ninth, excavating a tunnel trunk; and finally, continuously cycling by taking an area of 15 to 30 m as a grouting strengthening cycling section to realize the construction of the tunnel by curtain groutingfrom the upper-half section. The method can greatly reduce the construction difficulty, shorten the construction period, and ensure the construction quality, and the construction is safe, quick and economic, so the method can be widely used in the field of tunnel construction.
Owner:2ND ENG CO LTD OF CHINA RAILWAY 12TH BUREAU GRP

Method for constructing road swivel bridge and railway swivel bridge by using turnplate spherical hinge

The invention relates to a method for constructing a bridge, in particular to the method for constructing a road swivel bridge and a railway swivel bridge by using a turnplate spherical hinge, which aims to solve the problems of the complex process, inconvenient construction, high requirements on construction sites, and the like of the conventional swivel bridge construction. The method specifically comprises the following steps of: machining the turnplate spherical hinge; constructing a lower pile cap and mounting a lower spherical hinge and an endless track, wherein the concrete of the lower pile cap is poured in three stages; constructing an upper pile cap and mounting an upper spherical hinge and a support steel cylinder; and after the upper pile cap and the lower pile cap are swiveled in place under the action of the turnplate spherical hinge, pouring rear sealed concrete between the upper pile cap and the lower pile cap. The method has the advantages of the capacity of changing overhead barrier operation into operation on the coast or near the ground, safe and reliable construction, simple and convenient operation, fast implementation and construction cost reduction, is suitable for both straight bridges and curved bridges, and compared with the conventional construction methods, also has the advantages of shortening construction period, saving a part of big construction machinery and labor force and greatly saving construction cost.
Owner:2ND ENG CO LTD OF CHINA RAILWAY 12TH BUREAU GRP +1

Soft rock four-line large-span tunnel compound double-side wall bracing cable conversion excavation construction method

InactiveCN102226398AExpand the working areaInternal force redistribution is not obviousUnderground chambersTunnel liningEngineeringBuilding construction
The invention relates to a soft rock four-line large-span tunnel compound double-side wall bracing cable conversion excavation construction method which has the characteristics of safety in construction, speediness and simpleness in operation, and is further applicable to large-scale machines for construction. The method comprises the following steps: (1) excavating pilot holes on side walls on two sides, firstly implementing corresponding forepoling before excavation, and immediately implementing corresponding preliminary bracing and temporary bracing after the excavation; (2) pouring pedestal foundations on the two sides; (3) excavating side pilot holes of arch parts on the two sides respectively, firstly implementing the corresponding forepoling before the excavation, immediately implementing the corresponding preliminary bracing and the temporary bracing after the excavation, and implementing a pre-stressed anchor cable connected with a surrounding rock anchor at the top of the corresponding preliminary bracing; (4) excavating core soil of the arch parts bench by bench, firstly implementing the corresponding forepoling before excavating an upper bench, immediately implementing the corresponding preliminary bracing after the excavation, and implementing the pre-stressed anchor cables connected with the surrounding rock anchor at two end parts of the preliminary bracing; (5) pouring secondary lining of the arch parts; (6) excavating the lower core coil bench by bench; and (7) pouring an inverted arch, and pouring the inverted arch to the design height.
Owner:CHINA RAILWAY ERYUAN ENG GRP CO LTD

Peaty soft soil stratum subway station construction technology

The invention discloses a peaty soft soil stratum subway station construction technology. A main structure of a constructed subway station comprises base plates, side walls, top plates and middle plates distributed between the top plates and the base plates. Underground consecutive walls are arranged on outer sides of the two side walls. The base plates, the side walls, the middle plates and the top plates are all of a rebar concrete structure formed by pouring waterproof concrete. The subway station construction technology comprises the following steps: (1) underground consecutive wall construction, (2) foundation reinforcement, namely, three-shaft stirring piles are used for reinforcing the foundation of excavated foundation pits, (3) vacuum water falling, namely conducting vacuum well point water falling construction on the foundation pits needing excavating, (4) foundation pit excavation, namely, an open excavation method is used for conducting earthwork excavation on the foundation pits needing excavating with a plurality of excavating layers from top to bottom, (5) subway station main structure construction. The method is simple, convenient to realize, quick in construction speed, capable of being ensured in construction quality easily, and good in construction effect, and enables the subway station construction process of peaty soft soil stratum to be completed simply, quickly and with high quality.
Owner:中铁二十局集团第五工程有限公司

Method of performing combined drilling, flushing, and cutting operations on coal seam having high gas content and prone to bursts to relieve pressure and increase permeability

The present invention relates to a “drilling-flushing-slotting” coupled pressure relief and permeability increasing method for a high gas outburst coal seam, which is more particularly suitable for the pressure relief and permeability increasing when gas of a roadway band of the high gas outburst coal seam is pre-extracted through crossing boreholes. On the basis of the crossing borehole pre-extraction measures for the coal seam gas, the hydraulic flushing and the hydraulic slotting are reasonably combined, and a “drilling-flushing-slotting” dedicated device is utilized to implement the coupled operation of “low pressure drilling-medium pressure flushing-high pressure slotting” in a borehole, so that the coal in the pre-extraction area is deformed and moved to form network cracks, passages are provided to the desorption flow of the gas, and the gas is easier to extract. The method can enlarge the single-hole pressure relief influence range, increase the gas permeability of the coal seam, improve the gas extraction efficiency, reduce the number of pre-extraction boreholes, shorten the pre-extraction time and have good applicability to the coal seams in different occurrence states. The present invention can reduce the number of the crossing boreholes by 32.5% and can reduce the length of each crossing borehole by 42.9%, is remarkable in coal roadway regional outburst eliminating effect, and obviously increases the tunneling speed.
Owner:CHINA UNIV OF MINING & TECH
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