223results about How to "Improve construction convenience" patented technology

The invention discloses early-strength nano C-S-H crystal nucleus concrete in a low-temperature curing environment and a preparation method thereof. The concrete is composed of the following substances in parts by weight: 260-300 parts of PO52.5 ordinary Portland cement; 135 to 155 parts of slag; 60 to 70 parts of fly ash; the water-binder ratio is 0.27 to 0.31; the sand ratio is 0.40 to 0.44; the water reducing agent accounts for 1% of the mass of the gel body; the nano C-S-H crystal nucleus accounts for 6%-10% of the mass of the gel body; 1080 to 1210 parts of coarse aggregate; and 770 to 870 parts of fine aggregate. The method comprises the following steps: (1) respectively weighing the cement, the slag and the fly ash according to the parts by weight, putting into a stirrer, and stirring for 1 minute; 2) continuously adding sand and stone into the concrete mixer, and continuously stirring for about 2 minutes; and 3) adding the water, the water reducing agent and the nano C-S-H crystal nucleus into the mixture, and uniformly stirring for 2 minutes. The method effectively solves the problem of slow development of concrete strength in a low-temperature environment, also solves the problems of long construction period and high maintenance cost of a concrete structure in winter, and has obvious engineering significance and relatively strong economic benefits.

The utility model discloses a dry building vegetation retaining wall which comprises undisturbed soil, a concrete foundation and a first concrete coping, the concrete foundation is arranged on the side, close to a riverway, of the undisturbed soil, the first concrete coping is arranged on the top layer of the undisturbed soil, and a riverway retaining wall is arranged above the concrete foundation. A broken stone hardcore is arranged on the slope face of the undisturbed soil, an ecological retaining wall is arranged above the broken stone hardcore, and an ecological protection slope is arranged in the ecological retaining wall. The concrete foundation is built beside the riverway, the riverway retaining wall is built on the concrete foundation so as to reduce direct contact between a riverway water source and undisturbed soil, meanwhile, the ecological retaining wall is laid on the riverway slope through the broken stone hardcore, and in the weather with a large amount of rainfall, the slope protection upper layer is protected by the ecological retaining wall. Silt and stones are prevented from being scoured, and the overall protection performance of the retaining wall is effectively improved.

The invention relates to the field of electric power engineering, in particular to a direct current remote supply communication system based on a cable trench, which comprises a monitoring terminal, a comprehensive monitoring platform, a local module and a remote module, compared with a direct-current remote supply technology in the prior art, the direct-current remote supply device has certain power supply capacity for equipment in a cable trench, but has the defects that on one hand, different power supply requirements of different equipment cannot be met, for example, the power supply requirement of timing starting or manual control starting is needed, and resource waste is caused, and on the other hand, the direct-current remote supply device cannot meet the power supply requirements. The power supply state cannot be sensed, and problems cannot be found in time; the communication system transmits the power supply condition of the direct-current remote power supply equipment to the platform through the network communication technology, can monitor the power supply state in real time, has higher reliability, can check the state of a power supply line through the system platform, can perform early warning in time, improves the fault processing capability, can control power supply according to the requirements of the electric equipment, and improves the power supply efficiency. And unnecessary power consumption is reduced.

The utility model relates to a concrete modular building suitable for old community reconstruction, which comprises a plurality of concrete modules divided from the same floor space according to different indoor space functions, and a plurality of prefabricated parts divided from a public area according to functions, wherein the prefabricated part comprises a shear wall, a first pouring cavity is formed in the shear wall, and a second pouring cavity is formed between the adjacent concrete modules corresponding to the shear position in the floor space and / or between the adjacent prefabricated part and the concrete module; according to the invention, concrete can be poured in the first pouring cavity and the second pouring cavity so as to form a shear area of the floor, and the shear area can be combined with the corresponding concrete module and / or prefabricated part into a whole by pouring the concrete in the preset first pouring cavity and the second pouring cavity in situ so as to form the shear area of the floor. And the consistency of the shearing force area, the prefabricated parts and the concrete modules is improved, so that the overall strength of the modular building is improved, and the anti-seismic effect is improved.

The pipeline backfilling equipment comprises a shell, the top of the shell is open, a filtering assembly is arranged at the open position of the top of the shell, and the filtering assembly is used for filtering soil materials entering the filtering assembly, dividing the soil materials into small particles and large particles and discharging the soil materials with the small particles and the large particles separately. One side of the shell is connected with the vehicle body, and the shell is driven by the vehicle body to advance above a pipe ditch; the feeding device is arranged on one side of the shell; the soil filling assembly is used for receiving the discharged small-particle soil materials and the discharged large-particle soil materials; and the compaction roller is arranged at the bottom of the shell. According to the device, soil materials can be sequentially subjected to feeding, filtering, feeding and compacting treatment, multiple vehicles do not need to be matched for construction, the construction efficiency and convenience can be effectively improved, and after the soil materials are filtered, only fine particles can make contact with a pipeline, so that the pipeline cannot be damaged during subsequent compacting and normal use.

The invention relates to the technical field of polyurethane adhesives, in particular to an adhesive for frock smooth aluminum and a preparation method of the adhesive for frock smooth aluminum. The component A is prepared from the following raw materials in parts by weight: 25-40 parts of a polyol composition, 50-75 parts of a calcium filler, 0.1-0.3 part of a dispersing agent, 0.1-0.3 part of a catalyst, 1-4 parts of a molecular sieve, 0.01-0.2 part of a defoaming agent and 0.1-0.5 part of nano silicon dioxide, the component B is prepared from isocyanate at least, and by controlling the selection and matching of polyol, the dispersing agent and the catalyst in the system and controlling the addition amount of each raw material, the component A and the component B can be prepared into the polyurethane adhesive. When the provided adhesive is used for bonding smooth aluminum (1-2 mm) and a cellular board, the peeling strength of a roller is larger than or equal to 60 N * mm / mm, and the actual outer wall application requirement is met.

The invention relates to an intelligent photovoltaic curtain wall which has the function of adjusting light transmission intensity. The surface of the photovoltaic curtain wall is fully covered by the photovoltaic module, the supporting body is installed behind the photovoltaic battery module, and the photovoltaic module is fixed on the supporting body through the module fastener. Air hole channels are arranged among the photovoltaic modules to adjust temperature, and air holes can be connected with external constant-temperature systems such as a central air conditioner, so that the photovoltaic curtain wall has good constant-temperature capability. The photovoltaic cell is located between the guide rails, and the controller controls the driving motor to achieve movement of the cell position, so that the light transmission intensity is adjusted in good time. A mechanical arm and a control motor are arranged in the photovoltaic cell storage box and used for storage and output of photovoltaic cells, and the control motor receives instructions of the controller to operate. The controller is connected with the driving motor and the control motor through data lines, the shielding area ratio of the photovoltaic cell is automatically adjusted according to user requirements, and automatic adjustment of the light transmission intensity is achieved.

According to the high-altitude large valve groove pipe butt splicing device and the construction method thereof, the actual requirement of high-altitude large valve groove pipe centering splicing work in an actual construction site can be met, operation is easy and convenient, the construction convenience and the construction efficiency are improved, a right side pipeline is adjusted through the variable-frequency chain hoist, and the right side pipeline is adjusted through the variable-frequency chain hoist; the lifting and descending speed range is wide, the control precision is high, and high-precision centering of the grooved pipe section can be achieved. And the device can be recycled, and only groove aligning devices with different diameters need to be replaced for groove pipes with different pipe diameters. The device is convenient to disassemble, after the groove pipe sections are spliced and installed in a butt joint mode, the bolts on the upper half and the lower half of the groove alignment device are loosened, the chain lock is unlocked, the temporary beam and the variable-frequency chain hoist on the second support are disassembled, and then the device can be disassembled; meanwhile, materials are easy to obtain, manufacturing is easy, cost is low, and safety and durability are achieved.

The invention discloses a preparation method of a polyurethane-acrylate dispersoid and application of the polyurethane-acrylate dispersoid in a coating, and belongs to the technical field of chemical engineering, and the preparation method comprises the following steps: S1, preparation of a bifunctional prepolymer: reacting glycidyl phenyl ether with adipic acid to generate a polyfunctional acrylate derivative, and then reacting with a sulfydryl-terminated thio-polyurethane prepolymer to obtain the bifunctional prepolymer; a difunctional prepolymer is obtained; s2, preparation of a mixed solution A: mixing the thio-urethane acrylate prepolymer with a viscosity reduction solvent, a hydrophilic chain extender and dihydroxy propionate, fully and uniformly stirring, and reacting hydroxyl in the dihydroxy propionate with isocyanate groups in the thio-urethane acrylate prepolymer to generate an isocyanate-terminated prepolymer; the problems that in the prior art, a polyurethane-acrylate dispersion is poor in stability and insufficient in comprehensive performance are solved, and the polyurethane-acrylate dispersion has the advantages of being good in weather resistance and efficient in processing.

The invention discloses an automatic site selection method and system for a mountain fan hoisting platform, and belongs to the technical field of new energy wind power generation engineering, and the method comprises the steps: obtaining original topographic data, and reconstructing the original topographic data into a digital elevation model with a spatial index; querying the digital elevation model by using a spatial index based on the structural security constraint parameters of the fan foundation, and determining an effective elevation search interval; discretizing a calculation area into grid units in an elevation interval, taking a core area as a seed point, and outputting binary grid data through a potential energy driving cost function and a heuristic search extension platform boundary; performing morphological correction on the binary raster data and calculating the total earthwork amount; and iteratively searching and optimizing a scheme with the minimum total earthwork volume in the elevation interval, and converting the scheme into vectorized engineering primitives to be output. On the premise that the safety of the foundation structure is ensured, the earthwork amount is globally optimal, and the method has the advantages of being high in automation degree, high in terrain adaptability and good in engineering practicability.

The invention provides a modular light sound insulation wall and a forming method thereof, and belongs to the field of fabricated building wall bodies, and the modular light sound insulation wall at least comprises a silencing support, a connecting piece and an outer coating layer. Furthermore, a plurality of silencing cavities are formed in the silencing supports, resonance silencing particles are arranged in the silencing cavities, and the inner sides of the surfaces of the two silencing supports are oppositely arranged and form a sound insulation air layer. The connecting piece is located on the sound insulation air layer and connected with the two silencing supports, and the outer covering layer is formed on the outer sides of the surfaces of the silencing supports. The silencing support is arranged, and the resonance silencing particles and the sound insulation air layer are combined, so that the purposes of light weight and good sound insulation effect are achieved.

The invention relates to the field of magnesium phosphate cement-based materials, and particularly discloses an interface-enhanced emulsified asphalt composite magnesium phosphate cement repairing material and application thereof. The repairing material comprises the following components in parts by weight: 400-600 parts of a magnesium phosphate cement-based material, 50-150 parts of emulsified asphalt, 5-10 parts of a toughening organic component, 10-15 parts of an optimizing agent, 8-20 parts of an interface reinforcing agent, 4-10 parts of chemically modified fibers and 80-100 parts of mixing water. The magnesium phosphate cement-based material comprises the following components in parts by weight: 150-300 parts of magnesium oxide powder, 70-150 parts of phosphate and 10-30 parts of a retarder. According to the invention, demulsification of the emulsified asphalt and hydration of the magnesium phosphate cement can be coordinated and matched with each other, the bonding capacity between the repairing material and a repairing interface can be enhanced, and the mechanical property of the repairing material is improved.

The invention discloses a splicing type water retaining device for hydraulic engineering construction, and relates to the technical field of hydraulic engineering construction, in particular to the splicing type water retaining device for hydraulic engineering construction, which comprises a first outer side bottom plate and a second outer side bottom plate, a first external connection stand column and a second external connection stand column are welded to the outer wall of the first outer edge bottom plate and the outer wall of the second outer edge bottom plate correspondingly, the first outer edge bottom plate and the second outer edge bottom plate are connected through a connecting bottom plate, and the bottom of the first outer edge bottom plate, the bottom of the second outer edge bottom plate and the bottom of the connecting bottom plate are provided with deep burying assemblies correspondingly. According to the splicing type water retaining device for hydraulic engineering construction, the connecting bottom plate is of a modular splicing structure and can be flexibly adjusted according to the width of a river channel, the whole device can be adjusted as needed when the number of the extending plates and the connecting bottom plate is not determined through the first extending columns and the second extending columns, and the transportation size and weight can be greatly reduced through the modular design; the device can be repeatedly used, the engineering cost is reduced, and compared with a traditional connecting mode, the construction time is greatly saved.

The utility model discloses a modularized steel enclosing purlin assembly convenient to quickly install, which comprises a steel sheet pile, a plurality of steel enclosing purlins and a plurality of steel enclosing purlins, the I-shaped steel enclosing purlins are transversely arranged on the inner sides of the steel sheet piles; the steel support is horizontally arranged between the I-shaped steel enclosing purlins, the steel support comprises a fixed head, a movable head and a supporting column, and the supporting column is arranged between the fixed head and the movable head; the bearing plate is clamped and fixed on the I-shaped steel enclosing purlin in a U shape and is used for bearing the steel support; rectangular mounting plates are arranged at the end of the fixed head and the end of the movable head, a U-shaped sliding rail is arranged on the bearing plate, an opening of the sliding rail faces upwards, and the mounting plates can be embedded in the sliding rail in a sliding mode. According to the steel enclosing purlin assembly, the bearing plates fixed in a clamped mode are arranged, the bearing plates are used for bearing the steel supports, rapid positioning and connection between the I-shaped steel enclosing purlins and the steel supports are achieved, and the construction convenience and the use efficiency of the whole steel enclosing purlin assembly are improved.

The utility model discloses a connecting node of space grid structure and space grid structure, including first member, second member and force transfer member, first member extends along first plane, second member extends along second plane, second plane and first plane form angle setting, the force transfer member is equipped with the first member, second member extends along second plane, second plane and first plane form angle setting. The cross section of the first component and the cross section of the second component are box-shaped. The force transmission component is located between the first component and the second component, the cross section of the force transmission component is in a trapezoid shape, the trapezoid is provided with an upper bottom, a lower bottom, a first waist edge and a second waist edge, the first waist edge extends in the normal direction of the first plane, the second waist edge extends in the normal direction of the second plane, the first component is connected to the first waist edge, and the second component is connected to the second waist edge. According to the connecting node of the space grid structure and the space grid structure, the components can be located on the same plane to be connected with the force transmission components, so that the components are connected smoothly, force transmission is direct, and the reliability and construction convenience of the connecting node are improved.

The invention discloses a ceramic plate curtain wall construction structure with high construction convenience and a mounting method thereof. The structure comprises a wall body, an embedded part and a positioning installation module. And the outer wall of the wall body is connected with an embedded part through a mounting bolt, is slidably connected with a guide rod and is used for positioning and mounting the ceramic plate. The positioning installation module comprises a clamping block, a support is fixedly installed at the bottom of the clamping block, and an infrared distance meter and other devices are arranged in the clamping block. In addition, corner connectors are fixedly installed on the outer walls of the embedded parts, stand columns are fixedly connected to the back faces of the corner connectors, and cross beams are arranged between the two columns. Connecting pieces are fixedly connected to the outer walls of the beams, hanging pieces are arranged on the inner surfaces of the beams, and ceramic plate bodies are fixedly installed on the outer walls of the hanging pieces. In addition, the system also comprises a safety detection module which is internally provided with a mounting box and other equipment. In the construction process, the embedded part can be fixed to the outer wall of the wall body through the mounting bolts, and the ceramic plate can be quickly and accurately positioned and mounted through the clamping blocks, the connecting blocks, the fixing pins and other assemblies.

The invention relates to a construction method for pile sinking near an underground diaphragm wall of a sheet-pile wharf. The construction method comprises the following steps of hole guiding parameter determination, hole guiding construction, pile sinking, pile splicing and pile conveying. According to the specification of the PHC pipe pile to be used and the plate-shaped wharf structure, hole guiding parameters are determined; the diameter of the guide hole is smaller than that of the PHC pipe pile, and the depth of the guide hole is larger than the bottom elevation of the underground diaphragm wall. According to the construction method, the front wall can be prevented from moving towards the sea due to the soil squeezing effect during pile sinking, meanwhile, the outer side displacement, caused by the soil squeezing effect, of the upper half portion of the front wall is reduced by optimizing the depth of the guide hole, the land side soil pressure of the lower half portion of the front wall is increased, the overall stability of the front wall is improved, and the bidirectional optimization effect is achieved. The bearing capacity of the pile foundation is not obviously lost, the construction convenience is improved, and the construction cost for changing the pile foundation into other pile foundation structures is greatly reduced.

This utility model discloses a highway bridge with convenient drainage, comprising a beam body and concrete and asphalt layers arranged sequentially from bottom to top on the beam body. Drainage ditches are provided on both sides of the beam body, with a filter layer at the top of the drainage ditches. A water collection trough of a certain height is reserved above the filter layer. Multiple drainage holes are spaced along the length of the bridge on the filter layer, with filter plugs inside the drainage holes. A drain pipe is provided at the bottom of the drainage holes, with the outlet of the drain pipe extending to the pier foot and connecting to a collection pool. This utility model has a simple structure, high ease of construction, short construction period, and low construction cost. It ensures good drainage effect and is very easy to clean, greatly reducing cleaning costs. The addition of a rainwater collection pool at the pier foot of the highway bridge enables rainwater recycling, which is environmentally friendly and prevents foundation corrosion at the pier foot, thus improving the service life of the bridge.

The invention discloses an adjustable floor thickness controller and a construction method, and relates to the technical field of building construction. The adjustable floor thickness controller comprises a vertical supporting module. The vertical supporting module comprises a first plate body, a second plate body and an adjusting assembly. The adjusting assembly comprises an inserting rod, a sleeve and a locking mechanism; the sleeve is vertically and detachably connected with the first plate body; and the inserting rod is vertically and detachably connected with the second plate body. The vertical supporting assembly is simple in structure and reliable in function, the adjusting assembly can conveniently adjust the distance between the first plate body and the second plate body, so that the overall height of the vertical supporting assembly is adjusted to adapt to construction operation of floor slabs with different target thicknesses, product compatibility and adaptability are improved, product standardization is achieved, the production and manufacturing efficiency is improved, and the production cost is reduced. Materials are fully supplied, and the construction period is prevented from being delayed.

The present invention relates to the technical field of integrated ceilings, and proposes an integrated ceiling device for building decoration, comprising a plurality of longitudinal keel frames, two transverse keel frames and a plurality of silos, wherein the plurality of longitudinal keel frames and the silos are equidistantly arranged in a linear array, and the two transverse keel frames are symmetrically arranged, thereby realizing highly integrated automation of ceiling installation. During the automated installation stage, the gusset plates automatically fall and are pushed to the installation grooves under the coordinated action of gravity and a pushing cylinder, and the electric turntable and the inclined top block cooperate to push the gusset plates to be continuously installed. The silos and the baffle plates ensure orderly supply and positioning of the gusset plates, and the reset spring realizes rapid reset of the baffle plates. The various components work closely together to form an efficient and stable installation process, thereby realizing automation and intelligence of ceiling installation, and significantly improving construction efficiency and convenience. Through the above technical scheme, the problems of single function and inconvenient cleaning in the prior art are solved.

The utility model relates to a support for cast-in-place construction of a combined construction section road beam, and belongs to the technical field of bridge construction, the support for cast-in-place construction of the combined construction section road beam comprises a lifting support, the top of the lifting support is provided with a bottom formwork used for pouring a beam body, and a web formwork and a wing formwork which are located on the two sides of the bottom formwork; the hydraulic driving device is arranged on the lifting bracket and is used for driving the web template and the wing templates so as to enable the web template to be butted with the bottom template; and the folding crawling ladder comprises an inspection ladder rotationally connected with the bottom template, and a driving part which is arranged on the lifting bracket and is used for driving the inspection ladder to swing to descend or ascend. The highway beam can be cast in situ in a way of inversely using the bracket hole by hole, so that the steel structure consumption of the highway beam cast-in-situ construction can be reduced, the construction cost is reduced, and the project is more economical and reasonable; in addition, the support can move as a whole, the dismounting workload of the support can be reduced, the high-altitude dismounting operation time of personnel is shortened, and construction operation is more convenient, efficient and safe.

The invention discloses a foundation structure for a jacket, the jacket and a wind turbine generator, the foundation structure comprises a suction bucket, a connecting part and a piling part, and a pressure regulating cavity is formed in the suction bucket; the connecting part is fixedly arranged on the top surface of the suction barrel and is suitable for being matched and connected with a jacket; the piling component is arranged on one side of the suction barrel and forms a piling channel suitable for the tubular pile to penetrate through. According to the foundation structure, the construction convenience of wind power development in the deep and far sea area and the bearing capacity and stability of the foundation structure can be remarkably improved, the complex seabed geological conditions are effectively dealt with through a negative pressure sinking mechanism of the suction bucket and reinforced supporting of the piling component, and the offshore wind power technology is promoted to develop towards the deep and far sea.

The invention relates to the technical field of coatings, in particular to an environment-friendly insulating coating for a sodium power battery and a preparation process of the environment-friendly insulating coating. The invention relates to an environment-friendly insulating coating for a sodium power battery. The environment-friendly insulating coating comprises the following components: modified epoxy acrylate resin, polyurethane resin, a free radical initiator, a cationic initiator, nano silicon dioxide, nano aluminum oxide, glass beads, a flatting agent, a defoaming agent, an anti-settling agent and a light stabilizer. The core-shell structure micro-nano rubber particles are used for modifying the epoxy acrylate resin, the flexibility and impact resistance of a cured coating are improved, the advantages of free radical curing and cation curing are combined, the shrinkage rate in the free radical curing process is reduced, the surface hardness of the coating is improved, dual-initiator systems are mutually balanced, and the curing performance of the coating is improved. According to the present invention, the rapid curing is achieved while the good mechanical property and the good adhesion are maintained, the formula is optimized, the matrix resin material, the filler and the auxiliary agent are selected, the solid component ratio is increased, the VOC emission is reduced, and the environmental protection is provided.

The utility model discloses a middle-shallow geothermal energy buried pipe mounting structure, which belongs to the technical field of buried pipes and comprises a supporting seat, a bottom plate is fixedly connected below the supporting seat, and an adjusting device is mounted in the supporting seat. According to the utility model, the adjusting device is arranged in the supporting seat and comprises the first threaded rod, the nut and the adjusting hole, so that an operator can rotate the first threaded rod in the mounting process to enable the first threaded rod to move up and down in the adjusting hole so as to drive the whole supporting seat to lift, thereby realizing accurate control on the mounting height of the buried pipe; the nut is fixedly connected to the upper surface of the supporting base, it is ensured that the structure is stable and reliable in the adjusting process, in actual construction, the adjusting mechanism can be flexibly adjusted according to the ground gradient or the concave-convex condition of a foundation, it is ensured that all buried pipes are located at the same elevation position, and uneven heat transfer or buried pipe damage caused by different buried depths is avoided; the system effectively adapts to complex and changeable terrain environments, and the system operation stability is improved.

The application discloses a rectangular frame column settlement observation point pre-burying device and a pre-burying construction method. The device comprises a first L-shaped plate, a second L-shaped plate and a gear mechanism. The gear mechanism comprises a hollow rectangular base plate, a gear and a positioning ring. A settlement observation rod is arranged in the positioning ring, the gear and the hollow rectangular base plate. Upper bolts and lower bolts are arranged on the positioning ring. The method comprises the following steps: 1, rectangular frame column steel bar binding and formwork erection; 2, adjustment of the rectangular frame column settlement observation point pre-burying device; 3, installation of the rectangular frame column settlement observation point pre-burying device; 4, installation of the settlement observation rod; 5, concrete pouring and settlement observation rod pre-burying; and 6, removal of the rectangular frame column settlement observation point pre-burying device. After the rectangular frame column formwork is installed, the settlement observation point pre-burying device is used to pre-bury and fix the settlement observation point.

The utility model relates to a side formwork fixing device belongs to the building construction technical field, concretely is a kind of side mould reinforcing device for increasing cross section beam, including reinforcing frame and a pair of reinforcing plate, the both sides of reinforcing frame are equipped with hollow part, further include;Opposite bolt, the opposite bolt is threadedly installed on reinforcing plate, the opposite bolt is clamped on hollow part, and the both ends of the opposite bolt are threadedly installed with matched nut;Push plate, the push plate is slidably installed at the both sides of reinforcing frame, and the side of push plate is equipped with multiple through holes;The utility model has reached the effect of guaranteeing structural stability and applicability, solves the problem that the existing construction device is inconvenient to adaptively adjust the fixing structure according to the size of side mould when using, relative fixed column and horizontal pole, leading to the poor fixing effect of part side mould.

The invention relates to the technical field of tunnel engineering, and provides a construction method of a bealock section large-span multi-arch tunnel entry structure, which comprises the following steps: constructing a first pre-reinforcing pile assembly and a second pre-reinforcing pile assembly, excavating a temporary side slope to construct a middle pilot tunnel, excavating the middle pilot tunnel, and constructing a middle partition wall in the middle pilot tunnel after the middle pilot tunnel is communicated. And backfilling soil and stones to the bottom height of the protective arch, constructing the protective arch located above the left tunnel hole and the right tunnel hole, constructing an open cut tunnel section and an end wall type tunnel portal, backfilling soil at the top of the protective arch to the designed height, and then synchronously constructing the left tunnel hole and the right tunnel hole to the hidden tunnel section. According to the method, synchronous construction of the left main hole and the right main hole of the multi-arch tunnel can be achieved, the construction procedures of the multi-arch tunnel are greatly reduced, safety is high, meanwhile, the side slope is effectively reinforced, the side slope is prevented from collapsing in the excavation process, the design method of the protection arch is further provided, the determined protection arch can meet the structural requirement, and construction convenience can be improved.

The invention provides a weak surrounding rock vertical shaft pilot shaft protection wall structure and a construction method, and relates to the technical field of building construction.The protection wall structure comprises a well protection module, the well protection module comprises a plurality of axially-connected pipe bodies, the outer diameter of each pipe body is smaller than the inner diameter of a construction pilot shaft, and the adjacent pipe bodies are detachably connected; the concrete backfilling module is filled between the well protection module and the inner wall of the construction pilot well; and the lower end of the construction pilot shaft is provided with an underground adit in a communicating mode, the supporting platform is installed in the underground adit, and the top end of the supporting platform is connected with the pipe body located at the lowermost portion. Compared with the prior art, the problem that the pilot shaft wall is prone to damage during pilot shaft construction can be effectively solved.

The invention belongs to the technical field of building materials, and relates to disposable redispersible asphalt powder as well as a preparation method and application thereof. The asphalt powder comprises the following components in parts by weight: 100 parts of asphalt, 2-20 parts of an emulsifier, 5-20 parts of protective colloid, 0.5-40 parts of a stabilizer, 1-10 parts of a slow-release complexing agent and 5-20 parts of an anti-caking agent. The slow-release complexing agent is one or more of activated modified borax, modified boric acid, modified sodium silicate or chromate, and the activation mode of the slow-release complexing agent is that an inorganic salt aqueous solution and a part of the protective colloid solution are mixed in advance. The specific slow-release complexing agent is introduced and forms a synergistic system with the emulsifier, the protective colloid and the like, so that the asphalt powder can be quickly redispersed when meeting water for construction for the first time, the complexing agent and a hydrophilic component are subjected to irreversible reaction after drying and film forming, redispersibility is permanently lost, and the technical problem that a traditional product is poor in water resistance after film forming is effectively solved. The product is suitable for the fields of waterproof and anticorrosive dry-mixed mortar, asphalt coiled material base layer treating agents and the like.

The utility model discloses a prefabricated and assembled corrugated steel web combined box girder structure which comprises two I-shaped beam plates and a prefabricated slab erected between the two I-shaped beam plates. The prefabricated plate is prefabricated by a corrugated I-shaped steel web and two flange plates, L-shaped splicing blocks are pre-buried in the surfaces of the flange plates, L-shaped connectors corresponding to the L-shaped splicing blocks are formed in the surface of the I-shaped beam plate, and the L-shaped splicing blocks slide into the L-shaped connectors; the rotary limiting structures are arranged between the L-shaped splicing blocks and the L-shaped connectors; the corrugated I-shaped steel webs, the flange plates and the L-shaped splicing blocks are prefabricated to form an integral prefabricated plate in a factory, and then the two prefabricated plates are erected between the two I-shaped beam plates on site to complete quick splicing, so that the splicing efficiency and the construction efficiency of the whole combined box girder can be greatly improved, cast-in-place is not needed, and the construction cost is reduced. And the construction convenience is high.