1213results about How to "Improve construction progress" patented technology

The invention relates to the technical field of tunnel engineering, in particular to an anti-collapse comprehensive treatment construction process for a tunnel to pass through a karst development area, which comprises the following steps: S1, early-stage exploration and planning: understanding a geological structure, karst development condition and underground water distribution along the tunnel in detail through drilling exploration, geological radar and seismic wave exploration; according to the anti-collapse comprehensive treatment construction process for the tunnel crossing the karst development area, the construction strategy is adjusted according to the actual geological condition, geological risks are treated more accurately, the construction progress is accelerated by adopting modern technologies and equipment such as geological radars, accidental interruption is reduced, comprehensive treatment measures are accurately controlled, and the construction efficiency is improved. The safety of the construction process is greatly improved, the influence on the surrounding environment is reduced, pollution is reduced by using environment-friendly materials and technologies, meanwhile, novel supporting materials and design are adopted in the construction technology, the novel supporting materials comprise a reinforcing mesh, anchor rods and sprayed concrete, immediate and lasting supporting is provided, and rock mass loosening and collapse are prevented.

The invention relates to a multi-interface cable auxiliary device for a high-voltage capacitor, and relates to the technical field of high-voltage capacitor cable wiring, the multi-interface cable auxiliary device comprises a side loading table of a placement rack, first, second and third support plates are all provided with wire coils, and a rotating rod is rotatably arranged above the loading table; two vertical plates are mounted on the fourth supporting plate; a rotary table is rotatably arranged between the two vertical plates; rotary tables are fixedly mounted at two ends of the rotary table; wire guide rollers are placed in grooves in the outer edges of the rotary tables; and a second pay-off roller with adjustable vertical height is arranged below the bracket. The cable does not need to be taken out manually, the operation time can be saved, the cable wiring efficiency is improved, meanwhile, the structural functionality is improved, cable inlet and outlet structures are more flexible, the situations of jamming and dislocation can be effectively avoided, and the construction progress of electric power engineering can be accelerated.

A long-distance pipe-jacking tunnel construction method based on three-dimensional stability analysis comprises the following steps: constructing a three-dimensional numerical model based on geological exploration data; performing high-precision discretization processing to form an infinitesimal triangular mesh; assigning physical and mechanical parameters to the soil body in the model; deducing a pipe-jacking tunnel excavation face supporting force calculation formula by applying a limit analysis upper limit theorem; developing an integrated calculation program, and performing comparative analysis with measured data; the accuracy of a calculation program is verified through actual measurement data, the jacking force is dynamically optimized by integrating construction parameters, and the influence of additional stress of the upper structure on construction stability is evaluated; the three-dimensional stability analysis model is optimized and updated, and accurate control over the construction process is achieved; and according to the optimization model and a data analysis result, a construction scheme is adjusted in real time to adapt to stratum change and construction deviation. Compared with a traditional method, the stability analysis precision of pipe-jacking tunnel construction is improved, the construction scheme is optimized, and the method has remarkable engineering application value and popularization prospects.

The invention discloses an urban large-section ultra-shallow-buried underground excavation tunnel approaching rapid construction method. The method comprises the following steps that S1, construction preparation is conducted; s2, an advanced large pipe shed is constructed; s3, reinforcing and grouting the bridge pile; s4, when the distance L between the tunnel face and the bridge pile in the longitudinal direction of the tunnel is larger than 3 m, the soil body around the tunnel is reinforced through full-section curtain grouting, otherwise, the soil body around the tunnel is reinforced through ground surface grouting, and compensation grouting in the tunnel is conducted according to the excavation condition of the tunnel; s5, tunnel excavation; during tunnel excavation, the tunnel is divided into a left pilot tunnel, a middle pilot tunnel and a right pilot tunnel, and meanwhile, the pilot tunnels are further divided into multiple steps for cyclic excavation; primary supporting and temporary supporting are conducted immediately after excavation of all the pilot tunnels is completed; and when the deformation displacement degree of the tunnel is gradually reduced, the temporary support is removed, an inverted arch is constructed, and the secondary lining is tightly followed. Therefore, under various auxiliary construction methods for tunnel construction, the self-stabilization capability of the soil covering stratum of the tunnel can be effectively improved, and the construction safety and the construction efficiency are improved.

The invention relates to a construction method of an anti-typhoon sea wave sea-crossing steel trestle and platform adjacent to a residential building. The construction method comprises the steps that firstly, deep fusion application of BIM and VR is conducted; step 2, surveying and setting out; step 3, embedding steel bars and pouring strip-shaped concrete; fourthly, the steel pipe piles are transported and lengthened; fifthly, steel pipe piles are driven; sixthly, parallel connection and diagonal bridging construction is conducted; seventhly, bearing beams are installed; eighthly, longitudinal beams are installed; ninthly, the distribution beams are installed; tenthly, bridge deck slabs and guardrails are installed; and 11, an intelligent monitoring and early warning system.

The invention discloses a recycled concrete interlayer-corrugated steel plate composite shear wall with recoverable functions. The anti-seismic property of the steel plate-concrete composite shear wall can be improved, but the steel plate-concrete composite shear wall is prone to local buckling or large deformation under the action of large horizontal loads. Frame columns are vertically arranged on a foundation; shear walls are arranged between the frame columns; a self-resetting device and a friction energy consumption device are arranged between the bottom of the shear wall and the foundation; the self-resetting devices are arranged at the bottom of the shear wall and on the two sides of the friction energy dissipation device. The foundation and the frame columns are fixed through column foot connecting pieces, and a lower end plate is arranged in the center of the foundation. Energy is dissipated through deformation of the disc spring, self-resetting is achieved through the self-resetting device after an earthquake, and residual deformation after the earthquake can be reduced; the energy dissipation beam section generates shear deformation due to the displacement difference between the shear wall and the frame column, the beam section dissipates energy through friction and pulls the SMA stranded wires to deform, and structural deformation is restored through elastic restoring force of the SMA stranded wires after an earthquake.

The invention discloses a wind power assembly type reinforced concrete tower tube assembly construction method, an assembly type reinforced concrete tower tube comprises a concrete tower splicing ring piece, a concrete tower full-circle ring piece and a steel tower conversion section, and the tower tube comprises the spliced ring piece, the full-circle ring piece and the steel tower conversion section from bottom to top; the construction method comprises the process of assembling the fabricated reinforced concrete tower drum through concrete tower piece splicing construction, concrete tower drum and steel tower conversion section hoisting construction and concrete tower drum prestress construction. According to the construction method, assembly and assembly of the concrete tower drum are completed through crawler crane line production, the fan foundation, the concrete tower drum and the steel conversion section are connected through concrete tower drum outer cable unbonded prestress construction, and the construction period is remarkably shortened. In addition, by optimizing the construction process, rapid installation of the prefabricated shell ring is achieved, the construction progress is accelerated, and meanwhile the construction cost is reduced.

The invention provides a construction device and method based on real-time monitoring of an asphalt pavement. The method comprises the following steps: collecting a visual detection image after paving an asphalt mixture in a target construction area; all asphalt aggregate particles are extracted from the collected visual detection images, the particle size characteristics of all the asphalt aggregate particles are determined, and aggregate groups in different particle size ranges are obtained according to all the particle size characteristics; obtaining the static distribution quantity of each aggregate group, determining the static boundary information of all aggregate groups in the visual detection image, and further determining the paving uniformity of the target construction area according to the static boundary information and all the static distribution quantities; and dynamically adjusting the screw pitch and the spiral rotating speed of a spiral material distributing machine in the asphalt concrete paver during asphalt pavement construction through the paving uniformity. By the adoption of the scheme, in the construction process of the asphalt pavement, the paving uniformity of asphalt paving can be monitored in real time, the paving parameters can be automatically adjusted, and therefore the overall paving uniformity in the construction process is improved.

The utility model relates to the field of pile foundations, in particular to an uplift precast pile structure which comprises a precast hollow pile and an anchoring device, the anchoring device is connected with the precast hollow pile, a plurality of unbonded prestressed steel strands are arranged in the precast hollow pile, and the anchoring device comprises a pile bottom anchoring part and a pile top anchoring part. The anti-pulling precast pile solves the problem that an anti-pulling precast pile in the prior art cannot be used as a long pile or an ultra-long pile, improves the anti-pulling bearing capacity of a single pile, improves the stress performance of the anti-pulling pile, and enables the anti-pulling pile to have better integrity and anti-pulling ductility.

The present invention relates to a double-walled steel cofferdam with no bottom and a construction method for deep-water rock capping platform rotary excavation. The BIM three-dimensional simulation technology is used to accurately design the size of the cofferdam module and the position of the preset holes, which greatly improves the accuracy and efficiency of the construction. By solving the problems of module size and layout in the design stage, the installation and commissioning work on site can be significantly reduced, thereby speeding up the construction progress and ensuring the quality of the project. The quick connection method of prestressed tendons and extruded waterproof strips is adopted between the cofferdam modules, which saves a lot of welding work, not only improves the construction efficiency but also reduces the construction difficulty. The guide device used for the lowering of the cofferdam is used for horizontal and vertical displacement and inclination monitoring, which can help the cofferdam lowering process more accurately, and greatly improve the construction efficiency and safety. The comprehensive slotting method of impact drill, rotary drilling drill and grab bucket greatly improves the slotting efficiency and reduces the slotting difficulty.

The invention relates to the field of earth-rock engineering, and discloses an organization design optimization method for improving the work efficiency of earth-rock engineering machinery, and the method comprises the following steps: S1, carrying out the modeling of each process in the earth-rock engineering through a directed acyclic graph; s2, calculating the earliest starting time and the latest starting time of each process by using a critical path method based on the process relation model, identifying a critical path of the project, and determining a critical process which affects the project construction period; s3, on the basis of the identified key process, performing process scheduling optimization by using mixed integer linear programming to ensure that the project period is minimized under resource limitation, and generating an optimized process scheduling scheme; and S4, based on the optimized process scheduling scheme, establishing a multi-stage queuing theory model, and optimizing the scheduling of the mechanical equipment. By optimizing procedure scheduling and mechanical equipment scheduling, the construction efficiency of earth-rock engineering is remarkably improved, the construction period and resource waste are reduced, and it is ensured that a project is efficiently completed on schedule.

The invention relates to a large deep foundation pit rotating trestle and a construction method, the large deep foundation pit rotating trestle comprises a trestle body and a supporting body, the supporting body and the trestle body are integrated, the supporting body is arranged below the trestle body, and the trestle body is divided into a straight section, a rotating slope section and a soil slope ramp; the straight sections are arranged on the edge of the top of the foundation pit, between the two rotating slope sections and at the tail ends of the rotating slope sections respectively, the rotating slope sections are arranged between the two straight sections, the tail end of the last straight section is provided with a soil slope ramp, and the soil slope ramp is directly communicated with the bottom of the large deep foundation pit. The trestle has the beneficial effects that the trestle occupies a small area of the deep foundation pit, bottom construction of the deep foundation pit is not affected, the construction difficulty of the deep foundation pit is reduced, the construction efficiency is high, the bearing capacity is high, the construction transportation capacity of the deep foundation pit is improved, the transportation efficiency is improved, and the construction progress of the deep foundation pit is accelerated.

The invention belongs to the technical field of aqueduct maintenance, and particularly discloses a high and large aqueduct body concrete spraying and maintaining device which comprises two main beams, a plurality of main beams and a plurality of auxiliary beams. The number of the straining beams is multiple, the multiple straining beams are sequentially distributed in the length direction of the two main beams, and the two ends of each straining beam are fixedly connected with the two main beams correspondingly; the rails are arranged in two rows, the two rows of rails are arranged on the two sides of the top end of the aqueduct body respectively, and the two main beams are perpendicular to the rails and are in sliding fit with the two rows of rails; the water tank is mounted at the top ends of the two main beams; the number of the spraying pipes is two, the two spraying pipes are located on the two sides of the aqueduct body respectively, and gaps are formed between the spraying pipes and the aqueduct body; the upper part of the spraying pipe is connected with the main beam; the water tank is communicated with the spraying pipe through a pipeline, and the pipeline is connected with a booster pump; and a plurality of spray heads are mounted on the spray pipe. Spraying maintenance can be conducted on the aqueduct body on the outer side of the aqueduct body, and the maintenance quality is improved.

The present invention relates to a high-alloy large-diameter pipeline welding method and an argon filling protection device thereof, which comprises: a V-shaped air chamber, an electromagnet and a power cord; the V-shaped air chamber as a whole is an arc-shaped structure matching the pipeline, and the two ends of the V-shaped air chamber are not connected. The cross-sectional structure of the V-shaped air chamber comprises a V-shaped portion, a first side edge, a second side edge and a shaping strip, the first side edge and the second side edge are respectively connected to the left and right sides of the upper edge of the V-shaped portion, and the first side edge and the second side edge are both perpendicular to the vertical center axis of the V-shaped portion. The shaping strip is an arc-shaped structure with the same curvature as the first side edge and the second side edge, and is fixed on the lower surface of the side edge. A plurality of electromagnets are evenly fixed on the lower surfaces of the first side edge and the second side edge, and each electromagnet is connected to a power cord. The device can effectively solve the problem that a special air chamber needs to be made for GTAW back-side argon filling welding of large-diameter pipelines, and argon needs to be continuously provided, which is easy to block the valve during the operation of the unit.

The invention discloses a hoisting construction method of a truck crane in an environment with limited bearing capacity of a floor slab, which is characterized in that supporting legs of the truck crane are erected on the floor slab and are positioned right above a structural beam, so that the counter force of the supporting legs of the truck crane acts on the structural beam. If no structural beam exists below the supporting leg of the truck crane, a conversion steel beam is erected between the two structural beams located in front of and behind the supporting leg, and the supporting leg is erected on the conversion steel beam. The invention relates to the technical field of building construction, and can solve the problem that in the prior art, a supporting full framing needs to be arranged at the bottom of a floor slab in truck-mounted crane hoisting construction under the environment that the bearing capacity of the floor slab is limited.

The utility model provides a building foundation bearing platform capable of being assembled. The foundation bearing platform comprises a bearing platform body with a pile foundation pouring opening, inserting grooves are formed in the two adjacent side edges of one set of the bearing platform body respectively, locking mechanisms are arranged on the two sides of the inserting grooves respectively, inserting pieces are arranged on the two adjacent side edges of the other set of the bearing platform body respectively, and the inserting grooves and the inserting pieces on the opposite side edges are matched with each other. The two bearing platform bodies are spliced through the inserting grooves of the inserting pieces and clamped through the locking mechanism. Length adjusting plates are arranged on the two opposite sides of the bearing platform body respectively, the two sets of length adjusting plates are connected with the bearing platform body through telescopic mechanisms, and the inserting pieces or the inserting grooves on the sides, provided with the length adjusting plates, of the bearing platform body are correspondingly arranged on the side faces of the length adjusting plates. The bearing platform can be spliced and assembled according to specific building requirements, the overall construction progress can be accelerated, the construction period can be shortened, and the spliced and assembled bearing platform can be suitable for multiple piles.

The utility model discloses an exterior wall real stone paint construction canopy, including canopy mechanism, and rolling motor and unrolling motor installed outside canopy mechanism, the bottom of canopy mechanism is provided with extension mechanism, and the top one side of extension mechanism is provided with extension motor, canopy mechanism includes first support plate and second support plate, the winding motor is fixedly installed on the outer side of the first supporting plate, the output end of the winding motor is fixedly connected with a winding roller, the outer side of the winding roller is evenly wound with rain shielding cloth, the end of the rain shielding cloth is fixedly connected with a balance weight rod, and the unfolding motor is fixedly installed on the outer side of the second supporting plate. By arranging the canopy mechanism, a winding motor can be used for driving a winding roller to rotate so as to wind the rain shielding cloth, meanwhile, an unfolding motor is used for achieving rotation of an unfolding driven roller so as to unfold the rain shielding cloth conveniently, and the rain shielding cloth can be vertically placed to protect the whole wall surface.

The invention belongs to the technical field of tunnel construction and underground engineering, and particularly relates to a high-ground-stress phyllite and sand slate interaction stratum tunnel water inrush prevention construction method which comprises the following steps that S1, a tunnel face is excavated in an upper step of a tunnel, a drainage hole is drilled, and a drainage steel pipe is buried for pressure relief; s2, a steel pipe is constructed to compact the weak rock mass, and the connecting tension of the net spraying concrete is increased; s3, constructing a self-drilling pipe shed at the arch part, and grouting to form a forepoling system; s4, core soil is reserved for mechanical excavation, and a crushing head is adopted for auxiliary excavation; s5, an upper step temporary inverted arch is constructed in time after excavation, reinforcing locking feet are constructed on arch feet on the two sides and side walls, and grouting is conducted; s6, the left side and the right side of the lower step are staggered and asymmetrically excavated and supported, and the excavation circulation footage is not larger than 2 m; and finally, the inverted arch is formed through one-time excavation, and the excavation circulation footage is not larger than 3 m. The pressure of large rheological deformation formed by water inrush is reduced, large rheological deformation of the soft rock non-uniform interaction stratum is controlled, and the construction efficiency and progress are improved.

The utility model relates to a circulating water pipeline foundation structure for a soft soil foundation large-area soil filling field, which comprises a foundation structure body, and the foundation structure body consists of a plurality of settlement reduction composite sparse piles, a raft foundation, a reinforced concrete wing wall, an artificial soil arc sand foundation, backfill plain soil and a circulating water pipeline, the bottoms of the subsidence reduction composite sparse piles penetrate through the upper soft soil layer and are supported on the hard soil layer, the tops of the subsidence reduction composite sparse piles are embedded into the raft foundation, reinforced concrete wing walls are poured over the raft foundation, the space between the raft foundation and the reinforced concrete wing walls is filled with an artificial soil arc sand foundation, and a circulating water pipeline is placed in the artificial soil arc sand foundation. A gap is reserved between the circulating water pipeline and the raft foundation, and the backfill plain soil is used for filling other remaining excavation areas. The device is simple and reasonable in structure, pipeline sedimentation is reliably and effectively controlled, and powerful support can be provided for soil arc sand foundations on the two sides of the thoracic cavity of the pipeline, so that the operation safety of the circulating water pipeline is ensured.

The overlying oxygen isolation device comprises a storage yard, a plurality of double-flow nitrogen conveying hoses are arranged on the upper surface of the storage yard, the interval between every two adjacent double-flow nitrogen conveying hoses is 0.5-3 m, a plurality of through grooves are formed in the outer surfaces of the double-flow nitrogen conveying hoses, the through grooves are distributed in the axis direction of the double-flow nitrogen conveying hoses, and the through grooves are communicated with the double-flow nitrogen conveying hoses. And a plurality of lifting arc supports are fixedly mounted on the upper surface of the storage yard corresponding to the double-flow nitrogen conveying hose. By arranging a double-flow nitrogen conveying hose, a nitrogen purifying and drying device and a nitrogen detection box, high-concentration nitrogen sequentially passes through a mixed gas buffer box, a first connecting pipe, a gas inlet pipe and a stable ventilation pipe and enters the combustible rock soil through the double-flow nitrogen conveying hose, and meanwhile, the nitrogen purifying and drying device extracts gas in the combustible rock soil; nitrogen rapidly enters the flammable rock-soil, air in the flammable rock-soil is rapidly extruded out through the nitrogen, and therefore the flammable rock-soil and the air are isolated, and spontaneous combustion of the flammable rock-soil is prevented.

The invention discloses an integrated offshore wind power jacket foundation grouting operation platform and a grouting operation method thereof. The operation platform comprises a main body frame with a horizontally arranged platform plate, and a through hole is formed in the center of the platform plate; a grouting raw material storage area, a grouting equipment placement area, a grouting preparation area and a grouting operation area are sequentially arranged at four edge positions in the circumferential direction of the platform plate; two cement-based grouting material storage boxes are fixed in the grouting raw material storage area; a grouting tool container, a generator set container and a diving tool container are fixed in the grouting equipment placement area; two grouting stirring tanks, two fresh water storage tanks and two grouting conveying pumps are fixed in the grouting preparation area, and a crane and a high-pressure flushing machine are arranged in the grouting operation area; according to the operation platform and the grouting operation method thereof, grouting operation can be started after the operation platform is pre-assembled at a wharf and is directly transported and installed at the top of the jacket, the construction difficulty is reduced, the cost is saved, and the construction efficiency and the operation safety are improved.

The invention relates to the field of equipment control, and discloses a building engineering construction environment monitoring method and system, and the method comprises the steps: a cloud data server builds a construction monitoring management container, obtains the concrete parameters of each construction stage, and obtains the concrete expected strength according to the concrete parameters; respectively carrying out pressure testing on the concrete test blocks poured according to the concrete parameters and the corresponding vibration parameters to obtain the actual strength of the concrete test blocks, and obtaining the strength achievement rate of the concrete test blocks according to the difference value between the actual strength and the expected strength of the concrete test blocks; if the strength achievement rate of each concrete test block exceeds a preset strength achievement rate threshold value, construction monitoring of the construction environment is completed. Manual intervention is reduced through automatic monitoring and intelligent regulation and control, the construction progress is accelerated, and meanwhile dependence on experience of operators is reduced.

The invention discloses a slope ramp hard rock tunnel core soil reserved excavation construction method. The method comprises the following steps that S1, a slope tunnel is divided into N sections in the length direction of the slope tunnel; s2, blasting the tunnel face of the upper step of the first section to reserve hard rock core soil; s2, an upper step is supported; s3, the upper step of the second section continues to be excavated, and meanwhile hard rock core soil is reserved; s4, hard rock core soil and a left middle step are excavated and supported, and a constructor stands on a left lower step for construction operation; s5, excavating a right middle step and supporting; s6, repeating the steps S2-S4 until all the upper steps and the middle steps on the slope tunnel are excavated and supported; s7, a left lower step is excavated and supported; s8, a right lower step is excavated and supported; according to the subway slope section hard rock tunnel construction method, blasting is controlled through shaping, a core rock platform is reserved on an upper platform of a subsurface excavation tunnel, and the problem of a construction operation platform is solved.

The invention discloses a fabricated component optimization method and system applied to concrete structure engineering, and is applied to the technical field of fabricated building construction. The method comprises the following steps: acquiring structural data of the fabricated building to establish a component model, and determining the layout of each fabricated component in the fabricated building; optimizing all the assembly type components based on the matching relation of all the assembly type components, and determining information of the optimized assembly type components; determining a production layout scheduling scheme of the fabricated components based on the optimized information of the fabricated components; and the construction procedures of the fabricated building and the construction conditions of all the fabricated components are determined, and fabricated building construction is conducted after production of the fabricated components is completed. By optimizing the matching degree between the prefabricated components and the production process and construction process of the fabricated components, the construction progress of the fabricated building can be accelerated, and meanwhile the construction quality of a project is guaranteed.

The invention discloses a shallow-buried tunnel excavation and primary support construction method. The method comprises the following steps that excavation and masonry of a top intercepting ditch of a tunnel and a tunnel opening drainage project are carried out; excavating earth and stone at the hole, and performing temporary protection on a side slope and a hole forming face; constructing an entrance hole-entering auxiliary measure; excavating a hole body; primarily supporting the tunnel body; constructing a pipe shed on an upward slope of an exit edge; performing inverted arch and backfill construction; tunnel body waterproof and drainage construction; performing open cut tunnel molded lining construction and tunnel portal construction; carrying out secondary lining; and pavement in the tunnel. The construction method has the advantages that the new Austrian method principle is adopted, the tunnel is divided into the left part and the right part to be excavated in the construction process, three-part layered excavation, primary support construction and mid-partition wall temporary support construction are adopted on one side of the tunnel, then the other side of the tunnel is excavated by steps, and the corresponding primary support construction method is carried out. Large-section tunnel construction is divided into small-section cavern construction through the mid-partition wall method, the early construction time of surrounding rock excavation is shortened, and therefore the stress change of surrounding rock excavation is stopped, and safe tunnel construction is facilitated.

The utility model provides a broken-line-shaped component type high-performance glass curtain wall which comprises a plurality of first wall bodies and second wall bodies arranged between every two adjacent first wall bodies, and each first wall body comprises a first stand column, a second stand column and an inner plate arranged between the first stand column and the second stand column; the second wall body comprises at least one cross beam and at least one glass panel; the glass panel is fixedly connected with the first wall body and the cross beam in a matched mode. The first wall body is assembled in a prefabrication mode in a factory, so that the assembly precision can be guaranteed, the stress strength of the first wall body is improved, and the on-site construction progress can be accelerated; besides, the cross beam of the curtain wall adopts a closed cavity design, is connected with the prefabricated first wall body through the insertion core on site, and can form a triangular prism truss structure together with the first wall body and the glass panel, so that the structural system can still keep higher mounting precision under the condition of meeting the requirements of larger span floor height and horizontal large division stress.

The utility model discloses a steel-concrete composite beam cast-in-place bridge deck slab construction supporting system which comprises narrow steel box girders, wood secondary ridges and wood formworks and is characterized by further comprising lug plates welded on the inner sides of the tops of the narrow steel box girders and steel main ridges fixedly connected between the adjacent narrow steel box girders through the lug plates. The cantilever steel pipe, the left inclined supporting rod and the right inclined supporting rod are arranged on the bottom plate cantilever plate on the inner side of the narrow steel box girder; the upper ends of the left inclined supporting rod and the right inclined supporting rod are connected with the midspan position of the steel main ridge, and the lower ends of the left inclined supporting rod and the right inclined supporting rod are connected with the cantilever steel pipes on the adjacent narrow steel box girders respectively. The wood secondary ridges and the wood formworks are sequentially arranged on the steel main ridges from bottom to top. A novel structural design is adopted, stress is reasonable, materials are conventional, installation is convenient, the construction speed is high, the construction cost is low, and compared with a full-space supporting system, the economic performance, the safety, the progress and the quality are greatly improved.

The invention discloses a reinforcement cage positioning and lowering device and a construction method thereof, and relates to the technical field of reinforcement cage lowering, the reinforcement cage positioning and lowering device comprises a moving frame, a lowering butt joint platform is arranged on the moving frame, and a horizontal adjusting assembly matched with the lowering butt joint platform is arranged on the moving frame; an auxiliary carrying platform is arranged on the moving frame, a moving adjusting assembly matched with the auxiliary carrying platform is arranged on the moving frame, a butt joint assembly matched with the lowering butt joint platform is arranged on the auxiliary carrying platform, and a position adjusting assembly which is matched with the lowering butt joint platform and used for adjusting the lowering position of the reinforcement cage is arranged on the auxiliary carrying platform. An auxiliary lifting mechanism matched with the position adjusting assembly is arranged on the auxiliary carrying platform. The problems of inaccurate positioning, low lowering speed, poor safety and the like in a traditional reinforcement cage lowering mode are solved, the construction efficiency and the engineering quality are improved, and a more advanced and reliable solution is provided for pile foundation construction of modern building engineering.

According to the double-cable single-anchor tunnel type anchorage and the construction method, two main cables of a bridge penetrate through an inclined hole with the axis parallel to the direction of the main cables to be led into the ground, after the direction of the main cables is deflected through a cable rotating saddle, the main cables penetrate through the inclined hole with the axis obliquely intersecting with the direction of the main cables and converge in a saddle chamber in the middle, and the side wall of the saddle chamber is provided with a transversely-installed splay cable saddle; the main cable is dispersed into a plurality of cable strands, the cable strands are dispersed in the front anchor chamber and anchored to a single wedge-shaped concrete anchor body, and the anchor body fully utilizes surrounding rock to jointly bear loads. The two main cables of the bridge are anchored to the same anchor body, and the anchor has the advantages of being convenient to construct, low in manufacturing cost, good in bearing performance and the like.

The invention provides a low-cost admixture for shotcrete and a preparation method thereof. The raw materials for preparing the admixture include the following components by weight percentage: 40% to 50% silica fume, 5% to 10% fast-hardening sulphoaluminate cement, 35% to 45% reinforcing agent, 2% to 4% dispersant, 1% to 2% shrinkage reducing agent, and 0.5% to 1% regulator. The raw materials for the shotcrete admixture are widely available, cheap and easy to obtain, can significantly improve the cohesiveness and pumpability of the shotcrete, shorten the setting time of the shotcrete, have high bonding strength with the rock base, reduce the rebound rate of the shotcrete, and greatly save the project construction cost.