30results about How to "Facilitate standardized construction" patented technology

The invention provides a steel wire drawing and hole cleaning device assembly for replacing an old lifting rod of an arched bridge pre-stressed boom. The assembly comprises a working steel strand, a stretching jack, an upper connector, a connecting rod, a lower connector, an upper supporting foot and a lower supporting foot, which are sequentially connected. A method for dismounting the old lifting rod is that a hydraulic stretching jack wire drawing mode is adopted; steel wire or the steel strand of the old lifting rod of the arched bridge pre-stressed boom is drawn out and then a hole is cleaned; when in the working state, the lower end of the lower connector is connected with the steel wire to be draw and while the upper end of the lower connector is respectively connected with the connecting rod, the upper connector and the working steel strand; the upper end of the upper connector is connected to the working steel strand by a clamping plate anchoring manner; the upper connector and the lower connector are connected with the connecting rod by a thread manner; the lower supporting foot is mounted on the bridge surface; the upper supporting foot used as a reactive supporting frame of the stretching jack is mounted on the lower supporting foot; the stretching jack is driven to stretch the working steel strand so as to achieve single wire drawing. The method and the method are applicable to replacement of the old lifting rods of all arched bridges; the original structure of the bridge cannot be damaged, and standard mechanical construction can be conveniently carried out.

The invention discloses a hoop type tool suspender device for changing a steel pipe truss concrete arch bridge suspender. The device comprises an upper cross beam, a tensioning-end anchorage, upper and lower temporary ropes, a conversion beam, a fixing-end anchorage, a lower joist and a hoop type arch crown anchoring antiskid system consisting of a bolt, a lifting belt, an anchoring hoop, a leveling steel box, an upper cross beam, an antiskid rope and an antiskid hoop, wherein one end of the anchoring hoop is anchored on a steel pipe truss arch ring by the bolt and the lifting belt through a winding way; one end of the antiskid rope is fixedly connected with the bottom of the anchoring hoop, and the other end is fixedly connected with the bottom of the antiskid hoop; and the antiskid hoop and the anchoring hoop are connected through a steel strand or a rigid pull rod. When the device is used for changing the suspender, with the hoop type anchoring antiskid system arranged on the arch, the upper temporary rope is connected with a bridge floor conversion beam, the lower joist is arranged below the lifting rod cross beam, the lower temporary rope is connected with the bridge floor conversion beam, and a jack on the bridge floor conversion beam is tensioned to realize conversion of the suspender force; and moreover, the structure is simple, and the manufacturing and construction cost is low.

The invention provides a whole-bundle drawing device assembly for replacing a hoisting rod and cleaning a hole. The whole-bundle drawing device assembly comprises a connector, a tool nut I, a high-strength screw rod, a supporting leg, a tensioning jack and a tool nut II; a steel wire and hole cleaning method for detaching an old hoisting rod of an arch bridge by adopting the device assembly comprises the following steps: firstly, drilling a bridge deck to an anchor head section of the old hoisting rod from top to bottom by utilizing a concrete core drilling machine; then, mounting the device assembly under the bridge deck and covering an upper end round hole of the connector onto an anchor plate of a steel wire anchor head to be drawn to be fixedly connected with the anchor plate through a welding manner; covering a lower end round hole of the connector onto one end of the high-strength screw rod through the tool nut I to be fixedly connected with the high-strength screw rod by adopting a thread connection manner; taking the supporting leg as a counter-force supporting frame of the tensioning jack and mounting the supporting leg on the bottom surface of a lower transverse beam of the bridge; taking the high-strength screw rod as a jack tensioning part and drawing the whole bundle of the steel wire of the old hoisting rod of the arch bridge or the anchor head of a steel strand by adopting the hydraulic tensioning jack; and finally, cleaning the hole. The method has the advantages of relatively short construction and working time, low cost, economical efficiency, safety and reliability, and convenience for standardized construction.

The invention discloses a device for replacing a traction friction type anchoring hanger rod. The device comprises a fixed end anchoring tool, a stretching end anchoring tool, an upper transfer girder, upper and lower steel strands, a lower supporting beam, and a traction friction anchored type arch top anchoring skid resisting system which is mounted on an arch of an arch bridge, wherein the arch top anchoring skid resisting system comprises a friction anchoring device I consisting of two groups of upper and lower riding type clamping devices I and two pull rods I, and a friction anchoring device II consisting of two upper and lower riding type clamping devices II and two pull rods II; the two ends of a pulling cable are respectively anchored on the upper riding type clamping devices I or the upper riding type clamping devices II; a pulling jack is driven to stretch the pulling cable to realize skid resistance of the traction type arch top friction anchoring skid resisting system; four rotary lifting tools for levelling are respectively positioned at the two ends of the two upper riding type clamping devices I and the two upper riding type clamping devices II and rotate through pin shafts so as to adaptively realize levelling of the lifting tools; according to the device, small influences are caused to stress of an original structure during a cable force transfer process of hanger rod replacing; convenience is provided for standard construction; high work efficiency is realized.

The invention discloses an annular pre-stress anchoring counter-force rectification device for bridge horizontal rectification, belonging to the technical field of bridge horizontal rectification restoration construction. The device specifically comprises a cross-shaped counter-force rack, a horizontal rectification jack, a leveling steel support, a steering steel support, an annular pre-stressing steel stranding harness, a tensioning jack, a tensioning end anchor and a fixed end anchor, wherein the cross-shaped counter-force rack is anchored on the side face of a pier column through the pre-stressing steel stranding harness; one end of the horizontal rectification jack supports against the upper part of the cross-shaped counter-force rack, and the other end of the horizontal rectification jack pushes against a main beam of the bridge, so that rectification restoration can be realized. The annular pre-stress anchoring counter-force rectification device has the advantages of simple and light structure, economical construction cost, convenience in assembly and standard construction, short construction period, slight influence on structure stress and high combination degree with structure characteristics of bridge piers, and is not influenced by the mounting space of pier top.

The invention discloses a cable tension uniformity monitoring system for parallel steel strand stay cable and construction method thereof. The construction method comprises the following steps: establishing a monitoring system, determining a graded tension process, monitoring tension of the stay cable, screening the unqualified tension, compensating tension, jacking and anchoring, unloading the monitoring system, and constructing the next steel strand stay cable. The cable tension uniformity monitoring system for parallel steel strand stay cable and construction method thereof solves the problems that the traditional cable tension cannot be monitored or only the integral cable can be monitored and a basis for adjusting the cable force aiming at the uneven cable force of a single steel strand cannot be provided. When the stay cable is integrally tensioned, the uniformity of each steel strand is controlled by monitoring the cable force value of each steel strand step by step, so that thecable force adjustment between each steel strand is facilitated. The method has the advantages of high degree of automation, high control precision, low labor cost investment, high work efficiency, safety, reliability, simple operation and convenience for standardized construction.

The invention discloses a device for replacing a main cable clip of a suspension bridge and a mounting method of the device. The device comprises temporary hoops, rubber pads, a hanging bracket, steelwire ropes and lug plates, wherein the hanging bracket is formed by splicing a plurality of sections, and the temporary hoops are arranged on the two sides of the main cable clip respectively and aredetachably connected with a main cable; the rubber pads are arranged between the temporary hoops and the main cable, the lug plates are connected with the lower portions of the temporary hoops, one end of each steel wire rope is connected with the corresponding lug plate, and the other end of each steel wire rope is connected with the hanging bracket. The section type spliced hanging bracket serves as a construction platform, and the lower space of the main cable of the suspension bridge is effectively utilized; the temporary hoops anchored on the main cable serve as counter force fulcrums, the structure is light, the construction cost is low, installation is convenient, standardized construction is facilitated, the construction period is short, and the influence on the stress of the structure is small.

The invention discloses a traction-type tool derrick rig for replacing derricks of a steel tube truss-concrete arch bridge. The traction-type tool derrick rig comprises fixed end anchorage devices, tensioning end anchorage devices, upper conversion beams, temporary derricks, a sling device, and a traction-type arch crown anchorage and anti-slide system composed of hanging belts, anchorage beams, traction ropes, traction jacks, slide shoes, slide plates, travelling mechanisms, levelling mechanisms, cross beams and adjustable screws, wherein one end of each of one hanging belt and one traction rope is anchored at the two sides of the corresponding anchorage beam, the other end of each traction rope is connected with the corresponding traction jack through the corresponding travelling mechanism, the other end of each hanging belt is fixed on a web member, the slide shoes are installed at the bottom of each travelling mechanism, and connected with the travelling mechanism through arc-shaped hinged supports; and one levelling mechanism is located above each travelling mechanism, each adjustable screw penetrates through the corresponding levelling mechanism and the corresponding travelling mechanism, and each adjustable screw, the corresponding levelling mechanism and the corresponding travelling mechanism are connected through pin shafts. According to the device, during a rope force conversion process for derrick replacement, the stress system of the original structure is not changed, the influence on a stress of the original structure is low, the labour working intensity is low, standardized construction is facilitated, the working efficiency is high, and the construction cost is low.

The invention relates to a single-layer attachable climbing and outward-lifting protective device. The single-layer attachable climbing and outward-lifting protective device comprises an anchoring screw and positioning supporting seats, an upper set of positioning supporting seat and a lower set of positioning supporting seat are arranged, and clamping grooves are formed in the head parts of eachpositioning supporting seat. A climbing device comprises vertical arm rods clamped in the clamping grooves and connecting lug plates which are welded on the upper and lower positions of the vertical arm rods, and the vertical arm rods and the positioning supporting seats are connected in a hinged mode. Movable clamping rings are arranged at the two ends of connecting pipes in a sleeving mode. Thefour connecting pipes with the movable clamping rings are connected to form a rectangular frame, and a safety net is laid on the rectangular frame. One ends of wire ropes are connected with the connecting lug plates which are located at the upper ends of the vertical arm rods, and the other ends of the wire ropes are connected with the one side of the rectangular frame by the movable clamping rings. The other side of the rectangular frame is connected with the connecting lug plates which are located at the lower ends of the vertical arm rods. The ingle-layer attachable climbing and outward-lifting protective device can be pre-fabricated as a whole on the ground, the safety process is programmed and simplified, standardized construction is facilitated, and the outward-lifting net device canbe directly lifted and climbed by inverted chains and tower cranes.

Provided is a curved bridge fitting laying structure based on orthogonal prefabricated beam plates and a laying method thereof. The fitting laying structure includes an upper portion beam plate system, a beam plate protection structure and a lower portion support structure. The upper portion beam plate system comprises a plurality of spans of the beam plates arranged in the curve chord tangent direction of the curve, and each of the beam plates is the same in size, and each of the beam plates comprises the orthogonal prefabricated beam plates arranged side by side. Plate seams of every span formed by each of the orthogonal prefabricated beam plate are trapezoidal staggered, and the plate seams are filled with wedge-shaped wood strips. The laying method includes the determination of a benchmark span, the laying of pier capping beams, cushion rock and support seats, the laying of middle beams and cantilever side beams, and the laying of the filling of the plate seams and shielding structures of the plate beams. The curved bridge fitting laying structure based on the orthogonal prefabricated beam plates and the laying method thereof are applicable to a curved bridge with assembly typeconstruction on an upper portion of the curved bridge, and prefabricated beam plates of each span of the curved bridge are the same in size, the plate seams between each span are regularly staggered,the laying method is reasonable and ingenious, and the calculation of the design of the beam plates is simplified, the construction quality of the prefabricated beams is ensured, and the assembly construction can shorten the construction period of the curved beam bridge.

The invention provides a clamp type cable sheath grounding frame which comprises multiple grounding copper bar components which are fixed on the wall. The technical main points are that the grounding copper bar components comprise multiple grounding copper bar units I and grounding copper bar units II which are identical in structure. The adjacent grounding copper bar units I or the grounding copper bar units II are connected in series via bridging copper bars. The grounding copper bar units I or the grounding copper bar units II comprise copper bar bodies, multiple pin parts which are integrated with the copper bar bodies and positioned at the bottom parts of the copper bar bodies and equidistantly arranged, and insulating sheets which are arranged at the two ends of the copper bar bodies. The same side of the grounding copper bar components formed by the grounding copper bar units I and the grounding copper bar components formed by the grounding copper bar units II and the same grounding trunk lead-out copper bar are fixed simultaneously. The grounding copper bar components are fixed on the wall via expansion bolts assembled on the insulating sheets. Problems of disordered cable shielding layer grounding installation mode, poor uniformity, poor anti-interference performance and poor resistance consistency can be fundamentally solved.

The invention relates to a house structure, comprising a foundation, a house body formed on the foundation, and a roof mounted on the house body. A main body frame is connected on the foundation and encloses a accommodating space, and the main body frame is a frame structure surrounded by a plurality of transverse beams and longitudinal beams. By adopting the technical scheme of the present invention, the skeleton structure of the house body is surrounded by a plurality of prefabricated integral main frames, the main frame is pre-processed in the factory and sold as a whole, and the main frame is directly installed on the foundation after being transported to the construction site. It improves the efficiency of on-site construction, and also facilitates the standardized construction of houses.

A full-bundle ejecting-drawing assembly for hanging rod replacement hole cleaning comprises a U-shaped hoop, a shoulder pole steel beam, flat jacks and steel cushion blocks which are installed in sequence, wherein in a usage state, the U-shaped hoop is fixedly connected with a steel wire anchor head to be ejected and drawn in a welding mode, the shoulder pole steel beam is installed between the steel wire anchor head to be ejected and drawn and the bottom of the U-shaped hoop, and two flat jacks are respectively installed between the top surfaces of two ends of the shoulder pole steel beam and the bottom surfaces of a hanging rod cross beam. The steel cushion blocks serving as flat jack height adjusting cushion blocks are installed between the bottom surface of the hanging rod cross beam and the tops of the flat jacks and drives the flat jacks to reversely eject the shoulder pole steel beam and the U-shaped hoop so as to achieve full-bundle ejection and drawing. By using the device and a method for dismounting an old hanging rod, arch bridge oil hanging rod dismounting can be performed under limited operating height (for example, spanning an existing railway line), the manual operating strength is low, the working efficiency is high, the full-bundle ejecting-drawing assembly is safe and reliable, the construction operation time is relatively short, and the construction cost is relatively economical.

The invention discloses a cage ladder which comprises a cage frame. The interior of the cage frame is used for accommodating a component. The cage frame comprises a first frame unit, a second frame unit and a third frame unit which are sequentially connected from bottom to top. The second frame unit comprises a plurality of sections of cage units sequentially connected from top to bottom. The first frame unit, the third frame unit and the cage units are all internally connected with a step ladder. Pull pipes are arranged in the cage units and closely abut against the component. The interior ofthe third frame unit is detachably connected with a construction platform. A climb ladder is arranged between the step ladder in the third frame unit and the construction platform. The cage ladder iseasy and fast to mount and convenient to construct; and the purpose that the multiple processes such as protection, maintenance and heat preservation of the component are completed through one-time erecting can be achieved, reutilizing can be achieved, and the construction efficiency is improved advantageously.

A clamp-type cable sheath grounding frame, including several grounding copper bar assemblies fixed on the wall, and its technical gist is: the grounding copper bar assembly includes several grounding copper bar units I and grounding copper bar units with the same structure II, between adjacent grounding copper bar units I or between grounding copper bar units II through bridging copper bars; A number of feet arranged at equal intervals at the bottom, insulating sheets located at both ends of the main body of the copper bar; the same side of the grounding copper bar assembly formed by the grounding copper bar unit I and the grounding copper bar assembly formed by the grounding copper bar unit II are simultaneously connected to the same The main grounding copper bar is fixed, and the grounding copper bar assembly is fixed on the wall through expansion bolts assembled on the insulating sheet. It fundamentally solves the problems of chaotic installation methods, poor uniformity, poor anti-interference performance, and poor resistance consistency of the grounding of the cable shielding layer.

The invention relates to a construction method of a tower-type sliding support frame and a large-span semicircular pipe truss structure. The tower-type sliding support frame includes several tower bodies, an operating platform, an oblique truss, a horizontal truss, cross tie rods, and a chassis bracket and sliding structure; the construction method of the large-span semicircular pipe truss structure mainly includes the following steps: 1) Determine the layout plan of the support frame; 2) Lay the sliding track, install the tower sliding support frame, and install the first assembly unit ; 3) Move the tower sliding support frame forward by two main truss distances; 4) Install the second assembled unit to complete the installation of the third assembled unit; 5) Install the pipe truss structure in the second partition. The invention effectively shortens the construction period, occupies less land, and is convenient for standardized construction.

The invention provides a recyclable assembled foundation pit support construction method, which belongs to the field of foundation pit support construction and includes the following steps: S1, processing and checking soil nails, panels and backing plates; S2, soil nail positioning, Installation into the hole; S3, panel installation and fixation; S4, grouting between the panel and the slope of the foundation pit; S5, recycling the soil nails and panels after the foundation pit construction is completed to solve the construction process of the existing soil nail wall technology The failure to recycle the middle soil nails and hanging nets will easily lead to waste of resources and problems of low construction quality and construction efficiency due to the inability to achieve standardized construction during construction.

The present invention relates to the technical field of FAST radio astronomy telescopes, in particular to a method for replacing an adaptive connection mechanism of a FAST reflector unit. Panel; install the force system conversion device; adjust the position of the end shaft of the reflective surface panel; transfer the gravity of the reflective surface panel to the adjacent cable body; remove the adaptive connection mechanism to be replaced; install a new adaptive connection mechanism and fasten it with the node plate ; The force system conversion device removes and restores the installation of the small panel at the corner of the reflector unit. This method does not change the force system of the original structure during the replacement process of the self-adaptive connection mechanism of the reflection surface unit, and has little influence on the force of the original structure, and realizes the rapid replacement of the self-adaptive connection mechanism of the reflection surface unit, with low manual labor intensity and fast progress , no damage to the reflecting surface unit, can be used repeatedly, facilitates standardized construction, high work efficiency, and low construction cost.

The invention discloses a parallel steel strand cable construction cable force uniformity monitoring system and a construction method. The monitoring system comprises a top pressure jack, a tensioningjack, a pressure sensor, a squeeze sleeve, a data acquisition module and an upper computer. The number of pressure sensors is the same as that of stranded wires, and the jacking jack is arranged at the rear end of the parallel stranded wire working anchor, which is used for tightening the working clamps after the tensioning is completed. Tensioning jack is used for parallel steel strand cable tensioning; The pressure sensor is arranged in the tensioning jack and the extrusion sleeve; The host computer is connected with the data acquisition module, the data acquisition module reads the voltagesignal of the pressure sensor, and the host computer records, screens and stores the cable force value. When the whole system is stretched, the cable force value of each strand is monitored step by step to control the uniformity of each strand, and it is convenient to adjust the cable force between each strand. The system has the advantages of high automation degree and control precision, less manual investment, high efficiency, safety and reliability, simple operation and convenience for standardized construction.

The invention discloses a hoop type tool suspender device for changing a steel pipe truss concrete arch bridge suspender. The device comprises an upper cross beam, a tensioning-end anchorage, upper and lower temporary ropes, a conversion beam, a fixing-end anchorage, a lower joist and a hoop type arch crown anchoring antiskid system consisting of a bolt, a lifting belt, an anchoring hoop, a leveling steel box, an upper cross beam, an antiskid rope and an antiskid hoop, wherein one end of the anchoring hoop is anchored on a steel pipe truss arch ring by the bolt and the lifting belt through a winding way; one end of the antiskid rope is fixedly connected with the bottom of the anchoring hoop, and the other end is fixedly connected with the bottom of the antiskid hoop; and the antiskid hoop and the anchoring hoop are connected through a steel strand or a rigid pull rod. When the device is used for changing the suspender, with the hoop type anchoring antiskid system arranged on the arch, the upper temporary rope is connected with a bridge floor conversion beam, the lower joist is arranged below the lifting rod cross beam, the lower temporary rope is connected with the bridge floor conversion beam, and a jack on the bridge floor conversion beam is tensioned to realize conversion of the suspender force; and moreover, the structure is simple, and the manufacturing and construction cost is low.

A device for replacing traction friction anchoring suspenders, including fixed end anchors, tension end anchors, upper transfer beams, upper and lower steel strands and lower joists, and traction friction anchoring arches installed on arch bridge arches Top anchoring anti-slip system; the arch anchoring anti-slip system includes friction anchoring device Ⅰ composed of two sets of horse-riding upper and lower clamping devices I and two pull rods I and two sets of horse-riding upper and lower clamping devices II Friction anchoring device II composed of two pull rods II; the two ends of the traction cable are respectively anchored on the horse-riding upper clamping device I or the horse-riding upper clamping device II, and the traction jack is driven to pull the traction cable to realize the traction vault Anti-skid of friction anchoring anti-skid system; the four rotating spreaders for leveling are respectively located at the two ends of the two horse-riding upper clamping devices I and II, and the leveling of the spreaders is realized through self-adaptive rotation of the pin shaft; The device has less influence on the stress of the original structure during the cable force conversion process of the suspender replacement, is convenient for standardized construction, and has high work efficiency.

A full-bundle ejecting-drawing assembly for hanging rod replacement hole cleaning comprises a U-shaped hoop, a shoulder pole steel beam, flat jacks and steel cushion blocks which are installed in sequence, wherein in a usage state, the U-shaped hoop is fixedly connected with a steel wire anchor head to be ejected and drawn in a welding mode, the shoulder pole steel beam is installed between the steel wire anchor head to be ejected and drawn and the bottom of the U-shaped hoop, and two flat jacks are respectively installed between the top surfaces of two ends of the shoulder pole steel beam and the bottom surfaces of a hanging rod cross beam. The steel cushion blocks serving as flat jack height adjusting cushion blocks are installed between the bottom surface of the hanging rod cross beam and the tops of the flat jacks and drives the flat jacks to reversely eject the shoulder pole steel beam and the U-shaped hoop so as to achieve full-bundle ejection and drawing. By using the device and a method for dismounting an old hanging rod, arch bridge oil hanging rod dismounting can be performed under limited operating height (for example, spanning an existing railway line), the manual operating strength is low, the working efficiency is high, the full-bundle ejecting-drawing assembly is safe and reliable, the construction operation time is relatively short, and the construction cost is relatively economical.

The invention discloses an equal-thickness mortar smearing device for aerated bricks on a construction site and a construction method thereof.The device comprises a bearing plate, two elastic clamping plates are connected to one side of the bearing plate, and the two elastic clamping plates are each provided with a sliding groove formed in the length direction of the corresponding elastic clamping plate; the limiting insertion piece is arranged in the length direction of the elastic clamping plates, the limiting insertion piece is installed on one side of the supporting plate and arranged between the two elastic clamping plates, the limiting insertion piece is provided with a first side and a second side, and a containing space is defined by the second side, the pasting face of the aerated brick, the supporting plate and the two elastic clamping plates; the two ends of the mortar smearing plate are arranged in the sliding grooves of the two elastic clamping plates in a sliding mode respectively, and the distance between the mortar smearing plate and the limiting inserting piece is matched with the thickness of mortar smeared on the aerated bricks. The problems of engineering rework and unstable engineering quality caused by non-uniform mortar coating thickness of the aerated bricks during secondary masonry construction of existing constructional engineering are solved.

The invention provides a synchronous hydro-electric control cable force conversion system for suspender replacement. The system comprises a centralized control computer, a main control box, and multiple hydraulic pump station systems for temporary bottom-carrying lifting device cable force conversion. Each hydraulic pump station system for temporary bottom-carrying lifting device cable force conversion comprises a set of hydraulic pump stations and four jacks. A displacement sensor and a pressure sensor are installed on each jack. The four jacks are installed on a temporary bottom-carrying lifting device, and the jacks are connected with corresponding switching valves on the hydraulic pump stations through oil inflow oil pipes and oil return oil pipes respectively. The displacement sensors and the pressure sensors are in circuit connection with the main control box. The main control box is in circuit connection with each hydraulic pump station. The centralized control computer is connected with the main control box. The system can achieve automatic hydro-electric control cable force loading and unloading of the temporary bottom-carrying lifting device to complete the cable force conversion process, the automation degree is high, the synchronous control precision is high, the work efficiency is high, safety and reliability are achieved, and standardized construction is convenient.

The invention discloses a construction method of a steel guardrail concrete base. The construction method comprises the following steps of: adopting a prefabricated decorative plate in the range of a dripping eave on the outer side of the steel guardrail concrete base, and performing field installation and positioning; and enabling the concrete base to take a finished product of the decorative plate as an external mold and performing field pouring construction. A reinforcement cage of the decorative plate is processed and manufactured by a mold of the reinforcement cage of the decorative plate, a mold plate of the decorative plate adopts a plastic mold plate, and a vibration table is used for vibrating concrete, so that the appearance of the finished product of the decorative plate can achieve a mirror effect. The installation of the finished product of the decorative plate utilizes a gun carrier provided with a three-way fine adjustment device for fine adjustment, and after the finished product of the decorative plate meets the requirements after performing recheck and inspection multiple times, the finished product of the decorative plate can be firmly welded with a pre-buried steel bar on a box girder. The construction method disclosed by the invention has the advantages of greatly improving the appearance quality of the guardrail base, reducing decoration work and high-altitude operation safety risk, realizing accurate installation and positioning of a steel guardrail pre-buried piece, realizing low construction input and having better economic benefits and social benefits.