84results about How to "Avoid collapse accidents" patented technology

The invention discloses a method of synergetic extraction of coal bed gas of a tool post type mined area and a lower coal bed. The method comprises the steps that firstly, a mine is surveyed; after the floor failure depth is determined, a horizontal well is constructed; the coal bed gas of the mined area is extracted; when the extraction amount of the coal bed gas during unit time is decreased to 20-40% of Q1, the extraction pressure is decreased circularly so that coal bed gas extraction can be continued; when the extraction amount is decreased to 10-18% of Q1, supercritical CO2 is injected for displacement; when the extraction mount is decreased below 20% of Q1 again, oriented fracturing is conducted, a vertical discharge well is arranged on the other side of the horizontal well, and discharging equipment is arranged for conducting coal bed gas extraction; and when the extraction amount of the coal bed gas is decreased below 20% of Q2, the supercritical CO2 is used for displacement again, and extraction is stopped till the extraction amount is decreased to 10% of Q2. By the adoption of the method, coal bed gas resources close to a thin coal seam is extracted along with the coal bed gas in the tool post type mined area, and recovery of gas resources in abandoned still coal seams is achieved.

The invention is applicable to the data processing field and provides a road underground cavity detection system and a vehicle-mounted system. The road underground cavity detection system comprises a central control system, a satellite positioning system, a digital pre-processing system, a power supply system and a ground penetrating radar system, wherein the satellite positioning system, the digital pre-processing system, the power supply system and the ground penetrating radar system are connected to the central control system, and the digital pre-processing system is connected to the ground penetrating radar system. The invention can detect the cavities under the road, restores the cavities underground in advance and thus prevents the collapse accidents.

The invention discloses a bar member deformation monitoring device. The device comprises a rigid rod (1), a power supply (2) and a signal generator (3). Two ends of the rigid rod (1) is respectively provided with a first fixing fastener (4) and a second fixing fastener (5), wherein the first fixing fastener (4) and the second fixing fastener (5) are capable of being fixedly connected to a bar member to be measured respectively; the first fixing fastener (4) and / or the second fixing fastener (5) is provided with a first electrode (6) capable of being electrically contacted with the bar member to be measured; the middle of the rigid rod (1) is provided with a monitoring fastener (7); a monitoring hole (8) is arranged on the monitoring fastener (7), wherein the bar member to be measured can runs through the monitoring hole (8) and keeps a ring gap with the monitoring hole (8); the monitoring fastener (7) is provided with a second electrode (9) in the inner circumference of the monitoring hole (8) along the circumferential direction; the power supply (2) and the signal generator (3) are in series connection between the first electrode (6) and the second electrode (9). The bar member deformation monitoring device can monitor the deformation of the bar member in real time, is simple and convenient to install, and economical and reliable. The invention also provides a scaffolding monitoring alarm system.

A soft rock stratum underground excavation large-section tunnel construction method comprises the following steps of conducting excavation on the upper portion of the center of an arc part to form an arc part small pilot tunnel, and arranging an arc crown vertical supporting system in the arc part small pilot tunnel; conducting excavation to form a left upper pilot tunnel, a left middle pilot tunnel, a right upper pilot tunnel, a left lower pilot tunnel and a right lower pilot tunnel in sequence, and reserving a core rock wall in each pilot tunnel; pouring inverted arc concrete on the left side and right side and inverted arc backfill; pouring the arc part of a tunnel and a side wall secondary lining; excavating the core rock walls; pouring inverted arc concrete and inverted arc backfill. A supporting system adopted in the construction method comprises the arc part small pilot tunnel, a manual hole digging pile, the arc crown vertical supporting system, a side wall preliminary bracing and a core rock wall bracing, wherein the arc crown vertical supporting system comprises a steel pipe support penetrating through the manual hole digging pile and the arc part small pilot tunnel, and an independent foundation is arranged on the bottom of the steel pipe support and located on the bottom of the manual hole digging pile. According to the soft rock stratum underground excavation large-section tunnel construction method and the supporting system, sedimentation of the arc part of the tunnel can be effectively controlled, excavation footage is large, construction progress is accelerated, arc part secondary lining can be realized early, and construction safety is guaranteed.

The invention discloses a construction method of layer-built grouting of existing structures adjacent to a tunnel by advanced same-hole multiple ducts. The method comprises the following steps that 1,the grouting range and hole location arrangement are designed; 2, an inclined shaft support is removed; 3, tunnel integral construction is carried out; and 4, drill holes and small ducts are installed and grouted. The construction method directly transports slurry to the designated position with advanced small pipes similar to the distribution shape of branches, the role of skeleton is achieved at the same time, rapid and efficient grouting is achieved, small pressure is used for avoiding the impact of large pressure on a pipeline and ensure that the ground settlement or uplift is in the absolute safety range.

The present invention relates to a method for measuring the dynamic horizontal resistance coefficient of an excavated soil layer in a deep foundation pit, and belongs to the design field of excavatedsoil layer support in the deep foundation pit. The method comprises the following steps of: Step 1: arrangement of monitoring points for the displacement of the deep foundation pit and determination of monitoring methods; Step 2: determination of initial m-value of a soil layer in the deep foundation pit; Step 3: determination of a deformation reduction coefficient of the m-value of the soil layerin the deep foundation pit and a reduction m-value; Step 4: determination of the equivalent internal friction angle of the soil layer in the deep foundation pit; Step 5: determination of a dynamic m-value BP neural network prediction model structure for the soil layer in the deep foundation pit; Step 6: learning and training, and verification of the BP neural network prediction model; and Step 7:prediction of the dynamic m-value of the excavated soil layer in the deep foundation pit. According to the method disclosed by the present invention, based on a neural network model, the process of dynamic change of the m-value of the soil layer with excavation of the foundation pit is effectively reflected, a prediction model for the dynamic m-value of the excavated soil layer in the deep foundation pit is established, and collapse of the foundation pit caused by excessive deformation of the foundation pit supporting structure can be effectively prevented.

The invention discloses a quick well formation device in a soft soil layer, comprising a plurality of joints of hollow drill rods which are mutually connected for forming a well and then used as a well wall and a hollow drill bit which is connected with the last joint of the hollow drill rod, wherein a filter cylinder is arranged in the hollow drill rods, the filter cylinder is connected with thelast joint of the hollow drill rod by clamping, and the hollow drill rods are mutually connected through pipe hoops. As the plurality of joints of well formation device a plurality of joints which aremutually connected for forming the well and then used as the well wall are adopted, the drill rods can be used as the well wall without being lifted out, after forming the well, the filter cylinder can be arranged downwards in the hollow drill rods after forming holes, clamped at the bottom of the drill bit and used for directly pumping underground water, the pumping of the underground water cannot be affected by the increase of the depth, the increase of the pressure and the deformation of the well wall, the reasonable setting of the porosity of filter holes on the filter cylinder can ensure the smooth collection of water samples, and the setting of a settling chamber at the lower end of the filter cylinder can settle sediment and prevent the filter holes from being blocked. The quick well formation device can quickly complete the well formation in the soft soil layer region within the underground depth of 10m; and compared with the existing drilling and the artificial excavation, the quick well formation device can save the investment in human resources and material resources, greatly improve the working efficiency and avoid the well wall collapse accidents.

The invention provides an overweight vehicle driving state risk early warning method and system based on structure monitoring. The method carries out the risk dynamic recognition and early warning through the fusion analysis of the attribute and state information of an overweight vehicle and the bridge structure state monitoring data. Damage of overweight vehicles to a bridge structure, traffic interruption and blockage caused by the overweight vehicles and bridge collapse accidents can be effectively prevented or reduced to the maximum extent, and the driving safety of the overweight vehiclesis improved.

The invention discloses a large-span bridge traffic flow density control system and method based on a smart phone. The system comprises a data association module, an abnormal event monitoring module,a bidirectional traffic flow prediction module, a bridge monitoring center, an induction module and a traffic flow dynamic distribution module. The bridge monitoring center is in information communication with the bidirectional traffic flow prediction module and the traffic flow dynamic distribution module. The control system can predict the traffic flow condition in the bridge in a certain time period in the future according to the traffic flow density, the weather condition, the vehicle position, the vehicle speed and the vehicle quality of several kilometers around; when it is predicted that the traffic flow density in the bridge is too large, early warning is given to vehicles in advance to avoid the situation that a large number of vehicles are left on the bridge due to sudden accidents on the bridge and then bridge deck collapse and other dangerous situations caused by bridge overload carrying; meanwhile, the vehicles entering the bridge are subjected to lane guiding, and damageto the bridge structure due to uneven loads of different lanes on the bridge is avoided.

The invention relates to a nitride bonded sandwich load bearing board and a preparation method thereof, and belongs to the technical field of fireproof materials. The nitride bonded sandwich load bearing board comprises a mullite surface protection layer and a silicon nitride bonded silicon carbide middle layer, wherein the mullite surface protection layer is prepared from the following raw materials: mullite of which the coarseness is 0.2 to 1mm, mullite fine powder of which the particle size is 200 meshes, mullite of which the density is 325 meshes, clay and an organic bonding agent; the silicon nitride bonded silicon carbide middle layer is prepared from silicon carbide of which the coarseness is 1 to 3mm, silicon carbide of which the coarseness is 0.5 to 1, silicon carbide fine powder of which the coarsness is 0.5 to 1mm and the particle size is 325 meshes, silicon carbide ultrafine powder, the clay, metal silicon powder of which the particle size is 325 meshes and the organic bonding agent. According to the nitride bonded sandwich load bearing board disclosed by the invention, silicon nitride bonded silicon carbide is adopted as the middle layer, the high temperature bending strength of the silicon nitride bonded silicon carbide is high and is not reduced but increased under a high temperature, reaction between a magnetic material and the load bearing board is avoided during sintering of the magnetic material, and the service life of the load bearing board is indirectly prolonged.

The invention discloses equipment for one-time pile forming into rock of a screw pile driver and a pile forming method. The method employs the screw pile driver to realize pile forming into rock on a subgrade, and specifically comprises the steps of assembling and positioning the screw pile driver, drilling down into the ground to form a pile hole, lifting a drill, injecting concrete into the pile hole and placing a steel reinforcement cage. With the equipment and the pile forming method provided by the invention, drilling, pouring and pile forming can be completed in one step, the process steps of pile forming are simplified, the investment of manpower and material resources is saved and the production cost is reduced. Besides, the quality of drilling and pile forming is improved, and the working efficiency can be improved by 5-8 times in contrast with traditional process.

The invention provides a tunnel monitoring mechanism and a sedimentation monitoring method for a tunnel. The tunnel monitoring mechanism comprises an installing assembly and at least one fiber bragg grating pulling wire sensor, wherein the fiber bragg grating pulling wire sensor is connected with a demodulator; the installing assembly comprises a plurality of connecting elements and at least one positioning element; the connecting elements are arranged on the top of the tunnel; a connecting wire of one fiber bragg grating pulling wire sensor is connected onto one connecting element; the at least one positioning element is arranged on the inner wall of the tunnel; the connecting wire is positioned by the positioning element so that the fiber bragg grating pulling wire sensor is arranged at one side near the inner wall of the tunnel. The tunnel monitoring mechanism and the sedimentation monitoring method solve the problems of low tunnel sedimentation monitoring precision and real-time monitoring incapability in the prior art; meanwhile, the problem of interference on other work procedures during the monitoring can be solved.

The invention provides a settlement monitoring mechanism and a settlement monitoring method of a building structure. Among them, the settlement monitoring mechanism includes: a base, which is arranged on the monitored piece; a photoresistor assembly connected to the signal acquisition instrument, which is arranged on the base, and the photoresistor assembly includes a plurality of photoresistors, and the plurality of photoresistors are respectively along the The vertical direction and the horizontal direction are arranged in sequence; the laser emitter is arranged on the base or the reference plane. The technical solution of the invention effectively solves the problems in the prior art that the settlement monitoring accuracy of building structures is low and cannot be monitored in real time.

The invention relates to an overall type steel-based platform static load test load piling method for civil engineering. The overall type steel-based platform static load test load piling method for civil engineering is characterized in that the method is performed according to the following steps that, a steel-based platform is selected, a jack is installed at the center of test points, a main beam is installed on the steel-based platform, a jack cylinder body and the main beam are effectively connected, and the steel-based platform and the main beam are effectively connected; a reference beam is installed, and loads are piled; after the weight of the piled loads reaches a regulated weight and a test instrument meets the test requirement according to check, test loading can be performed;after a test ends, parts of the loads are unloaded; and the steel-based platform, the main beam and part of the loads are transferred to a next test point, the above steps are repeated till detectionof the test points of the whole program ends. By means of the load piling method, the large tonnage load piling potential safety hazards can be eliminated, the detection time and the detection cost are saved, a large tonnage static load experiment can be safely and conveniently implemented, integrity is good, self moving can be achieved, speed is high, cost is low, and energy conservation and environmental protection are achieved.

The invention provides a comprehensive foundation pit support construction method for a sandstone combined soil layer. The method comprises specific steps as follows: a, a clay layer on the upper layer is subjected to earth excavation, and a plurality of oblique inserting type well point dewatering pipes and a plurality of vertical type well point dewatering pipes are alternately mounted on a sand layer after excavation is performed to the sand layer; b, the oblique inserting type well point dewatering pipes and the vertical type well point dewatering pipes are operated simultaneously; c, excavation is continuously performed after water level of underground water in the sand layer is decreased to a reserved elevation, and dense steel screens are paved at the lower part of the sand layer and soil nails are adopted for anchoring after the excavation is performed to a rock layer; d, rocks of the rock layer are chiseled, and earth excavation is performed continuously; e, broken stones after chiseling are removed, and structural construction is performed. According to the method, a support mode of combination of light dewatering wells and dense steel screen anchoring is adopted, underground water in the sand layer can be drained in time, the safety of the foundation pit support process is improved, and the difficulty of foundation pit excavation is reduced. The support technology is simpler, the support cost is reduced, and the construction time is shortened.

The invention provides a steel rolling heating furnace which is characterized in that a hearth of the steel rolling heating furnace comprises a preheating section, a heating section and a soaking section which are arranged sequentially, wherein a retaining wall is arranged between the heating section and the soaking section; a metal pipeline is arranged in the retaining wall; one end of the metal pipeline is connected with a descending pipe of a steam drum; the other end of the metal pipeline is connected with an ascending pipe of the steam drum; and water separated from a steam-water mixture in the steam drum enters the metal pipeline from the descending pipe, absorbs heat of the retaining wall in the metal pipeline, then forms a steam-water mixture and enters the steam drum from the ascending pipe. Compared with the prior art, the metal pipeline in the retaining wall between the heating section and the soaking section of the steel rolling heating furnace is cooled by water cooling rather than evaporated cooling, and can share an evaporated cooling system with a furnace reinforcement pipe without reconstructing a cooling water system additionally, so that the steel rolling heating furnace has the advantages of investment saving, energy saving and consumption reduction, can recycle the heat, is good in cooling effect, and can avoid an accident that the retaining wall collapses due to scale formation of an inner wall of a suspension steel pipe of the retaining wall.

The invention discloses a construction structure for an underground passage crossing an urban road. The construction structure comprises a first construction structure (110) and a second constructionstructure (120), wherein the first construction structure (110) comprises enclosure piles (1) and waterproof curtains (2); the tops of the enclosure piles (1) on the two sides are each provided with afirst crown beam (3); a thick reinforced concrete cover plate (4) is arranged between the first crown beams (3) on the two sides; a supporting device is arranged between the enclosure piles (1) on the two sides; the second construction structure is characterized in that a reinforced concrete support is arranged between crown beams at the top, and other structures of the second construction structure are the same as the corresponding structures of the first construction structure; and plain concrete cushion layers (9) are arranged below the first construction mechanism (110) and the second construction structure (120) in the underground passage. The invention further discloses a construction method for the underground passage crossing the urban road. According to the construction structureand construction method for the underground passage crossing the urban road, the passage sealing time is short during construction, the construction efficiency is high, and the structure is stable.

A soft rock stratum underground excavation large-section tunnel construction method comprises the following steps of conducting excavation on the upper portion of the center of an arc part to form an arc part small pilot tunnel, and arranging an arc crown vertical supporting system in the arc part small pilot tunnel; conducting excavation to form a left upper pilot tunnel, a left middle pilot tunnel, a right upper pilot tunnel, a left lower pilot tunnel and a right lower pilot tunnel in sequence, and reserving a core rock wall in each pilot tunnel; pouring inverted arc concrete on the left side and right side and inverted arc backfill; pouring the arc part of a tunnel and a side wall secondary lining; excavating the core rock walls; pouring inverted arc concrete and inverted arc backfill. A supporting system adopted in the construction method comprises the arc part small pilot tunnel, a manual hole digging pile, the arc crown vertical supporting system, a side wall preliminary bracing and a core rock wall bracing, wherein the arc crown vertical supporting system comprises a steel pipe support penetrating through the manual hole digging pile and the arc part small pilot tunnel, and an independent foundation is arranged on the bottom of the steel pipe support and located on the bottom of the manual hole digging pile. According to the soft rock stratum underground excavation large-section tunnel construction method and the supporting system, sedimentation of the arc part of the tunnel can be effectively controlled, excavation footage is large, construction progress is accelerated, arc part secondary lining can be realized early, and construction safety is guaranteed.

The invention discloses a three-phase multiple extrusion graphite electrode distribution ferroalloy furnace power transmission smelting method and a system. Each phase of a transformer secondary-side three-phase wiring terminal is divided into at least two electrode wiring terminals connected in parallel; each electrode wiring terminal is connected with a high-quality extrusion graphite electrode; all high-quality extrusion graphite electrodes penetrate into a furnace from the top part of a furnace cover of a ferroalloy furnace; each two adjacent high-quality extrusion graphite electrodes has different phases; three high-quality extrusion graphite electrodes with different phases are uniformly distributed in an equilateral triangle way; and three-phase multiple high-quality extrusion graphite electrodes are uniformly and reasonably distributed in the furnace to transmit power for working, so that a high-temperature melting area in the furnace and an area for producing ferroalloy liquid through reduction reaction are enlarged, coverage areas are mutually crossed, overlapped and connected, the ferroalloy liquid can be discharged easily, the electric energy and the electrode consumption are greatly saved, and the safety accidents caused by the product quality problem of conductive electrodes are completely eradicated.

The invention discloses a safety early warning method for deep foundation pit excavation and construction. The method comprises main reason analysis of engineering accidents, deep foundation pit design and construction safety analysis, and deep foundation pit engineering construction safety monitoring and early warning management and safety control. The main reason analysis of the engineering accident comprises improper engineering investigation, small designed safety reserve, improper selection of a supporting scheme, improper waterproof and drainage measures and improper waterproof and drainage measures. The deep foundation pit engineering construction safety monitoring comprises deep foundation pit engineering construction safety monitoring, deep foundation pit engineering constructionsafety monitoring and deep foundation pit engineering construction safety monitoring. According to the safety early warning method for deep foundation pit excavation and construction, through real-time safety detection, the safety of the foundation pit can be monitored preferentially, safety early warning can be conducted in time, the safety of the foundation pit structure is guaranteed, collapseaccidents of the foundation pit are prevented, construction safety is guaranteed, and better use prospects are brought.

The invention discloses an adjustable supporting device for coal mine roadway supporting, comprising a base. A screw post is integrally formed above the base; a rotary adjusting sleeve is mounted outside the screw post in threaded manner; a fixing seat is arranged at the upper end of the rotary adjusting sleeve; a limiting rotary ring in rotational connection with the rotary adjusting sleeve is integrally formed at the lower end of the fixing seat. The adjustable supporting device designed herein allows supporting force for a roadway top to be adjusted conveniently through a jack and the rotary adjusting sleeve during supporting, and roadways of various heights can be supported conveniently and quickly in this way; further, the same support can be provided with multiple bases at any time for the purpose of supporting, and therefore, reinforcing the supporting performance of a local area is greatly facilitated; the adjustable supporting device also allows the supporting force for the roadway top to be adjusted conveniently through the jack and the rotary adjusting sleeve during support, so that collapse is avoided to great extent; the adjustable supporting device has high application value.

The invention discloses an underground parking well structure with vibrating wire type sensors and a one-way radio frequency chip. The underground parking well structure is the same as an existing soft soil area foundation pit technology, cement-mixed piles are used as water stop curtains, cast-in-situ bored piles are used as supporting piles, and reinforced concrete inner walls are arranged on the inner sides of the supporting piles. The underground parking well structure is characterized in that the vibrating wire type sensors for testing out-of-pit soil body lateral stress are welded to main ribs of the supporting piles, and the vibrating wire type sensors are connected to a data acquisition processor outside a well through wires and connected with a communication module through wires;launching is performed after signals enter the communication module provided with the one-way radio frequency chip, detection system software is downloaded at a remote receiving server, on a computerscreen, an out-of-pit soil body stress change curve can be checked, and pre-warning is performed when the peak exceeds the software setting indicator. Compared with the prior art, the underground parking well structure can monitor the soil body stress change of the outer side of a civil engineering structure by wireless propagation in real time by multiple people, and once the stress exceeds the warning data, timely early warning is made to avoid a collapse accident.

The invention discloses a construction device and a construction method for safe construction of an underground structure. The construction device comprises a foundation pit support assembly, whereinthe foundation pit support assembly comprises a plurality of support plates, each support plate comprises a plurality of surrounding plates and a plurality of soil retaining plates; each surrounding plate is a hollow plate-shaped structure, the surrounding plate comprises an outer side plate used for being connected with a foundation pit and an inner side plate close to the center of the foundation pit, a plurality of communication holes are formed in each outer side plate, and a drain hole is formed in each inner side plate; and a grouting pipe is arranged in a gap between any two adjacent soil retaining plates, and the outlet end of a grouting hole faces the side, away from each surrounding plate, of each grouting pipe. The construction method is based on the construction device. By adopting the device and the method, the support can be provided for foundation pit construction, so that the construction safety is facilitated; and meanwhile, after the foundation pit construction is completed, voids of a soil layer on the foundation pit edge caused by foundation pit construction can be partially or completely filled, so that the stability of the stratum around the foundation pit isfacilitated.

The invention discloses a collection method and device for images of a vertical shaft wall. A set of cameras is used to complete full coverage sampling of the whole shaft wall. Each time a hoist is lifted or lowered, a complete of the vertical shaft wall is obtained. The set of cameras consists of four cameras. The shooting angle of each camera is 90 degrees, each camera shoots one quadrant, and so the four cameras achieve 360 degree shooting of the shaft wall. During normal operation of the hoist, the camera set takes images of the shaft wall in real time, and the full coverage shooting of the whole vertical shaft wall is realized by arranging an appropriate sampling time and sampling frequency. Accurate acquisition of the shaft wall images is a key step in shaft wall defect automatic detection. The accurate acquisition of the shaft wall images for ensuring the detection of a shaft wall crack is of certain significance for preventing shaft wall damage and mine collapse accidents.

The invention provides a tundish roasting device and a control method thereof. The tundish roasting device comprises a burner, a control device and a temperature detection device, wherein a burning chamber opened outward is arranged in the burner; a gas transportation device and an air transportation device communicating to the burning chamber are arranged on the burner; the control device is connected to the gas transportation device and the air transportation device; the temperature detection device is connected to the control device. The temperature detection device is used for detecting acurrent roasting temperature of a tundish refractory material. The control device comprises a storer which stores a corresponding relationship between the roasting time of the tundish refractory material and an ideal roasting temperature and a controller of controlling flows of the gas transportation device and the air transportation device according to the corresponding relationship to adjust thecurrent roasting temperature. The embodiment of the invention provides the tundish roasting device capable of adjusting the roasting temperature of the tundish refractory material automatically and preventing collapse of the refractory material and the control method thereof.

The invention is applicable to the field of data processing, and provides a system and method for collecting underground environment detection data. The system comprises multiple underground environment detection devices, multiple microwave base stations which carry out point to point communication with any one underground environment detection device, and a server communicating with the multiple microwave base stations through the internet. According to the system and the method, all the underground environment detection devices can be integrated for data detection, underground environment analysis such as hole analysis can be carried out on a road, and therefore, the underground holes can be repaired in advance, thereby preventing collapse accidents.

The invention discloses a power-transmission smelting method and system for a calcium carbide furnace with a three-phase multi-extruded-graphite-electrode layout. Each phase of a transformer secondary-side three-phase terminal is divided into at least two electrode terminals which are connected in parallel, and each electrode terminal is connected with a high-quality extruded graphite electrode; all the high-quality extruded graphite electrodes penetrate into the furnace from the top of a furnace lid of the calcium carbide furnace, any two adjacent high-quality extruded graphite electrodes are out of phase, three out-of-phase high-quality extruded graphite electrodes are uniformly distributed to form an equilateral triangle, three-phase multiply high-quality extruded graphite electrodes are distributed uniformly and reasonably in the furnace and transmit electricity to do work, the high-temperature melting zone and the area for producing calcium carbide liquid through a reduction reaction in the furnace are enlarged, coverage areas intersect with each other and are overlapped and communicated with each other, the calcium carbide liquid can be discharged easily, electric energy and electrode consumption are greatly saved, and accidents caused by the product quality problem of conductive electrodes are thoroughly avoided.

The invention discloses an environment-friendly concrete conveying machine for a construction site. The environment-friendly concrete conveying machine comprises a main beam supporting frame; a support supporting frame is arranged at the top of the main beam supporting frame; the main beam supporting frame is provided with a slewing support through the support supporting frame; a main beam and a concrete conveying pipe penetrate through the interior of the main beam supporting frame; a feeding bent pipe is arranged at the bottom of the concrete conveying pipe, and a rotating bent pipe is arranged at the top of the concrete conveying pipe; one side of the rotating bent pipe is provided with a movable bent pipe through the concrete conveying pipe; the bottom of the movable bent pipe is provided with a discharging bent pipe through the concrete conveying pipe; the bottom of the discharging bent pipe is provided with a discharging hole cover; a connecting base is arranged at the top of thedischarging hole cover, and a noise reduction cover is arranged at the bottom of the connecting base; and the main beam is provided with a rotating balance frame through a pulley and a main beam diagonal brace, and a counterweight box is arranged on one side of the rotating balance frame. According to the environment-friendly concrete conveying machine for the construction site, through the powerful discharging hole cover, the problems that concrete is prone to splashing, and noise is large are solved.

The invention discloses a tunnel expanding pre-reinforcing system suitable for shallow burying and a reinforcing method thereof, and belongs to the technical field of underground engineering and tunnel engineering. A second door-shaped support and a third door-shaped support of the tunnel expanding pre-reinforcing system are arranged on the two sides of a first door-shaped support correspondinglyand are parallel to the first door-shaped support, the second door-shaped support is hinged to the first door-shaped support through a hinge part, and the third door-shaped support is fixedly connected with the first door-shaped support; height adjusting devices are arranged at the tops of the door-shaped supports, a mounting frame is arranged on the height adjusting devices, and a plurality of first hydraulic jacks are arranged on the mounting frame; a plurality of second hydraulic jacks are arranged between a side web and stand columns; and the first hydraulic jacks are arranged between thearch crown part of the web and the mounting frame. According to the tunnel expanding pre-reinforcing system suitable for shallow burying and the reinforcing method thereof, the front-section consolidation section of the tunnel-expanding pre-reinforcing system serves as a rigid supporting point, the rear section of the tunnel-expanding pre-reinforcing system adopts a hinged adjustment stress transmission point, adjustment and change are carried out along with blasting stress and surrounding rock counterforce, and dynamic loading equipment for active intervention protection and passive unloadingbalance is achieved.