72results about How to "Increase lateral stiffness" patented technology

The invention relates to an easy-to-replace marine single-point vibration reduction base which comprises a panel, the upper end face of the panel is matched with an auxiliary equipment base and provided with bolt holes used for being connected with auxiliary equipment, and a vibration reduction pad is laid between the panel and the auxiliary equipment base; the webs are vertically welded to the two sides of the lower end face of the panel to form a supporting structure of the vibration reduction base unit; wherein the face plate and the web plate are connected in a welded mode to form a vibration reduction base unit together, and the vibration reduction base unit is used for supporting and reducing vibration of auxiliary machine equipment. The damping device is compact and reasonable in structure and convenient to operate, the damping performance, the structural strength and the anti-corrosion capacity are remarkably improved by optimizing the structural design of the base, introducing the self-adaptive adjusting supporting device and the reinforcing rib plates and other innovative designs, and meanwhile installation and maintenance are facilitated. The beneficial effects jointly provide powerful guarantee for stable operation of ship power equipment, vibration and noise transmission are reduced, and comfort and invisibility of a ship are improved.

The utility model discloses a middle stand column system of a photovoltaic flexible support capable of adapting to a super-large slope mountain land, which comprises a support formed by a vertically arranged middle stand column and a horizontally arranged middle top beam, and the side face of the support is movably connected with an inner support. The flexible support has the advantages that the structure is more stable and reliable, stress is clear and reasonable, and the problem that a traditional flexible support is prone to large-scale collapse is effectively eradicated; the lateral stiffness is higher, the problem of prestress relaxation of the steel strand can be solved, and the deflection of the cable can be reduced; the matched foundation can be smaller in pile diameter and pile depth, so that the system construction cost is effectively saved; the root node is more stable and reliable under the complex crosswind working condition; the installation efficiency is high, the error-tolerant rate is high, and the adaptability is high under different slopes.

The utility model provides a force transmission structure of a vehicle body and a vehicle, a battery pack frame is integrated in the vehicle body, and doorsill beams on the left side and the right side of the vehicle body form side frames on the left side and the right side of the battery pack frame; the force transmission structure comprises a battery pack cross beam connected between the doorsill beams on the two sides, and the battery pack cross beam comprises a front cross beam arranged close to the front ends of the doorsill beams on the two sides, a rear cross beam arranged close to the rear ends of the doorsill beams on the two sides and a reinforcing cross beam located between the front cross beam and the rear cross beam. A battery pack inner cavity is defined among the front cross beam, the rear cross beam and the threshold beams on the two sides, the reinforcing cross beams are located in the battery pack inner cavity, and the reinforcing cross beams are arranged in the front-back direction of the whole vehicle at intervals. The lateral rigidity and the lateral force transmission channel of the vehicle body can be increased, and the lateral collision safety of the whole vehicle can be improved.

This invention discloses a low-damage steel frame structure and a prefabrication and assembly method. The structure includes: a foundation, a first frame column, a second frame column, frame beams, floor slabs, beam end connectors, and column bottom connectors. The first frame column is installed on the foundation via column bottom connectors. The second frame column is positioned above the first frame column, with the number of second frame columns determined according to the number of structural floors. The connection points between the first and second frame columns, as well as the connection points between two adjacent second frame columns, are located at the inflection points of each floor. The frame beams are fixedly connected to the second frame columns on both sides via beam end connectors. The floor slab is positioned on the upper surface of the frame beams. This invention enables the beam-column joints and column bottom joints to achieve a bending-shear separation stress mechanism, extending the plastic hinge areas at the beam ends and column bottoms, thereby reducing damage to the beam-column joints and column bottom joints, minimizing residual deformation of the steel frame structure, and improving the seismic toughness of the structure. All structural components can be prefabricated in a factory and assembled on-site, facilitating construction.

The application discloses a wall connecting rod for a frame structure outer wall scaffold and a construction method thereof, which comprises a rod body fixed on a wall body by means of a mounting piece and a rotating mechanism, the mounting piece comprises a fixed plate, a bolt one and a pre-buried piece, the pre-buried piece is fixed on the inner wall of an assembly hole opened on the surface of the wall body, the bolt one is threadedly connected between the pre-buried piece and the inner wall of the assembly hole opened on the surface of the fixed plate after penetrating through the inner wall, and is used for fixing the fixed plate and the wall body, the rod body is a three-section structure, which comprises a rod body one, a rod body two and a sleeve ring, the rod body one and the sleeve ring are integrally formed, and the rod body two is welded and fixed with the fixed plate. The three-section rod body and the sleeve ring are inserted and matched, the bolt two and the nut are locked and limited, the wall connecting rod and the wall body are rigidly connected, the free length of the scaffold vertical rod is effectively shortened, the lateral rigidity of the scaffold body is enhanced, and the scaffold body is prevented from shaking, tilting or collapsing.

The present invention discloses an active fuel pulsation attenuator for a vehicle engine, which relates to the field of fuel pulsation attenuators for a vehicle engine, and includes an elastic diaphragm and a chamber formed by an upper shell and a lower shell, wherein an air spring for pulling the elastic diaphragm toward the lower chamber is arranged in the upper chamber of the chamber, and a temperature regulating component for adjusting the stiffness of the air spring is also arranged at one end of the air spring. Based on the characteristics of semiconductor materials that can quickly cool and heat, the present invention combines the cooling and heating effects of semiconductor materials and applies them to the fuel pulsation attenuator for a vehicle engine, and can quickly and accurately control the semiconductor cooling sheet to adjust the air spring through the precise acquisition of the fuel pressure sensor, thereby realizing the active fuel pulsation regulation function.

The invention relates to the technical field of steel structure engineering construction, in particular to a super-long independent steel column segmented locking type temporary stabilizing device and a construction method thereof, and is suitable for the overall lifting stage of a multi-layer aerial corridor. The device comprises a first locking assembly surrounding a concrete column and providing an X-direction lateral fulcrum; the second locking assembly is fixedly connected to the surface of the steel column to form a force transmission interface; and the connecting conversion assembly connects the steel column and the concrete column into a whole, so that the X-direction load of the steel column is transmitted to the concrete column in sections. The super-long steel columns are temporarily decomposed into short column stress sections with the length not larger than the designed length, and lateral displacement is remarkably restrained. The construction method comprises the steps that the device is installed at the corridor joint, pre-tightening force is synchronously applied, displacement is monitored in real time, overall dismantling is conducted after lifting is completed, and no residue exists after dismantling. The method is not pre-buried and fully recycled, super-long columns are restored to be in a short column stress state, lateral displacement is reduced, steel is saved, the construction period is shortened, green construction and appearance completeness are both considered, and the method is suitable for a large-span corridor overall lifting project.

The invention provides a modular assembly type SRC beam-SRC bracket column frame structure and an assembly method thereof. The modular assembly type SRC beam-SRC bracket column frame structure comprises SRC bracket columns, SRC beams and column-column joint cores. The SRC bracket column comprises a bracket column type steel framework and column concrete, bolt holes are formed in the upper end and the lower end of the column cross-shaped steel and the upper end and the lower end of the column concrete, and a beam-beam connecting core is arranged at the outer end of the bracket beam H-shaped steel; the SRC beam comprises beam H-shaped steel, beam concrete and beam shoes, the beam shoes are arranged at the two ends of the beam H-shaped steel, and the ends of the SRC beam are connected with the beam-beam connection cores of the SRC bracket columns through the beam shoes; the column-column node core comprises a node core plate and two groups of L-shaped end plates, and threaded holes are formed in corresponding positions of the L-shaped end plates; every two vertically adjacent SRC bracket columns are connected and fixed through the column-column joint cores and the single-side self-locking high-strength bolts, every two horizontally adjacent SRC bracket columns are connected and fixed together through the SRC beams and the single-side self-locking high-strength bolts, and a frame structure is formed.

The utility model belongs to the technical field of vehicles, and provides a cross beam structure and a frame. The cross beam structure is arranged on a vehicle frame, the vehicle frame is provided with two longitudinal beams which extend in the length direction of a vehicle and are oppositely arranged, the cross beam structure comprises a cross beam body and connecting assemblies, the cross beam body extends in the width direction of the vehicle, and the connecting assemblies are arranged at the two ends of the cross beam body. And the cross beam main body is connected with the longitudinal beam through the connecting assembly. According to the utility model, the local transverse rigidity of the frame is improved, the local mode of the frame is also improved, the dynamic exciting force of an engine is avoided, the resonance of the frame is avoided, and the roar noise of acceleration in a vehicle is reduced.

The utility model discloses an auxiliary frame and a vehicle, and the auxiliary frame comprises two longitudinal beams which are transversely spaced; the cross beam is connected between the two longitudinal beams which are transversely spaced; the two first reinforcing rods are transversely spaced, the front ends of the first reinforcing rods are connected to the longitudinal beams and located behind the cross beams, the rear ends of the first reinforcing rods are used for being connected with a battery pack, and in the direction from front to back, the distance between the two first reinforcing rods which are transversely spaced is gradually decreased. Therefore, by arranging the first reinforcing rod, the force transmission path between the auxiliary frame and the battery pack can be increased, so that the lateral rigidity of the longitudinal beam and the structural strength of the battery pack are improved, and the structural reliability of the auxiliary frame and the control performance of the whole vehicle are improved.

The present invention relates to the fields of water conservancy engineering and shipping engineering, and discloses a ship lift tower column structure with a sparse pile raft foundation and a layered strong constraint box beam, comprising a tower column body, the tower column body comprising two tower column groups that are symmetrical on both sides, the space between the two tower column groups forming a ship compartment, a raft foundation being arranged directly below the tower column body, a sparse pile group being arranged directly below the raft foundation, a plurality of layers of connecting box beam groups being arranged between the middle and upper parts of the two tower column groups, each layer of connecting box beam groups comprising two connecting box beams located at the most upstream and the most downstream, a top beam group comprising a plurality of top beams being arranged between the tops of the two tower column groups, and the two ends of the top beams being fixedly connected to the two tower column groups. The present invention provides a ship lift tower column structure with a sparse pile raft foundation and a layered strong constraint box beam, effectively controlling the uneven settlement of the ship lift foundation and its later rheology, reducing the lateral deformation of the structure, avoiding the torsional deformation of the tower column, and reducing the stress of each key part of the ship lift structure.

This invention discloses a hollow slab bridge pavement structure and construction method, applicable to the design and construction of hollow slab bridge pavement layers. The structure is characterized by comprising three parts: bridge deck pavement, self-stressing ribs, and anchoring bars. Three self-stressing ribs are transversely arranged at L / 4, L / 2, and 3L / 4 within a span of the bridge pavement. Under the action of these three transverse self-stressing ribs, the rigid connection of the hinge joints between the hollow slabs in the bridge superstructure is strengthened, the transverse bending moment transmission of the hinge joints is increased, and the transverse stiffness of the bridge is improved, thereby extending the bridge's service life. Compared with transverse prestressing reinforcement of the bridge superstructure at the bottom of the bridge slab, self-stressing ribs have advantages such as uniform stress distribution, strong bonding with the hollow slabs, reasonable stress distribution, simple process, low cost, and environmental friendliness.

The utility model discloses a buffer rubber sleeve for a bogie of a passenger train, which comprises a rubber sleeve main body, and a rigid spring is mounted in the middle of the rubber sleeve main body. According to the buffer rubber sleeve, the rigid spring is additionally arranged in the middle of the rubber, the vertical rigidity of the buffer rubber sleeve is increased, the transverse rigidity of the buffer rubber sleeve is increased, high compression of a product after being assembled is effectively guaranteed, the problem that installation is affected due to size creep reduction after a pure rubber part is used for a long time can be solved, and the service life of the buffer rubber sleeve is prolonged.

The invention is suitable for the field of structural walls, and provides a steel grid wall structure provided with an energy dissipation component, which comprises edge frame columns, edge frame beams, grid components, lug plates and low-elasticity high-damping components, the edge frame columns and the edge frame beams are connected to form a frame, the lug plates are arranged on the inner sides of the edge frame columns and the edge frame beams, and the low-elasticity high-damping components are arranged on the inner sides of the edge frame columns and the edge frame beams. And the low-elasticity high-damping component is used for connecting the grid component and is arranged on the grid component. During use, the low-elasticity high-damping component is arranged in the grid component, compared with a traditional steel grid wall structure system, the steel grid wall structure system has the advantages of being clear in damage mode, concentrated in energy consumption and efficient, and effective control over a structural plasticity development area can be achieved.

The invention relates to a large-impact-resistant aircraft structure with two-stage vibration reduction, and the structure comprises an aircraft structure body which is internally provided with a plurality of in-satellite single machines; the aircraft structure body is sleeved with the first-stage shock absorbers, and the first-stage shock absorbers are configured to reduce impact overload force borne by the aircraft structure body through compression deformation of the first-stage shock absorbers; the multiple second-stage shock absorbers are arranged between the multiple in-satellite single machines and the aircraft structure body, and impact overload force borne by the in-satellite single machines is further reduced; and the driving part is in close contact with the first-stage shock absorber and is configured to bear impact overload force and transmit the impact overload force to the first-stage shock absorber. According to the large-impact-resistant aircraft structure, the first-stage shock absorber and the second-stage shock absorber are arranged, large-attenuation-ratio shock absorption with time-domain impact of about ten thousand g levels can be achieved through two-stage composite shock absorption, and normal work of a single aircraft is protected.

A prefabricated beam bridge reinforcement component, the beam bridge includes a beam body and a bridge pier and a cap bearing the beam body, the reinforcement component includes a concrete pier, a double limb, a double limb bottom hinge, a steel cross bar, a lower H-shaped steel, an upper H-shaped steel, a stiffening plate, a top plate and an angle adjustment pillar; two double limbs are connected by a steel cross bar to form a prefabricated component; a plurality of prefabricated components are superimposed, a lower H-shaped steel is installed on the double limbs at the top, and the double limbs at the bottom are supported on the cap through the double limb bottom hinge and the concrete piers, an upper H-shaped steel is arranged on the lower H-shaped steel, a top plate is arranged on the top of the upper H-shaped steel through a stiffening plate, the top plate is supported at the reinforcement position at the bottom of the beam body, and the upper H-shaped steel and the lower H-shaped steel are connected by an angle adjustment pillar. The present invention forms a new load-bearing structure by adding a left-right symmetrical prefabricated component and combining the supporting connection structure at the bottom of the beam, which significantly reduces the mid-span bending moment of the beam bridge and effectively prolongs the service life of the bridge.

The present application relates to a kind of single tube tower body reinforcing device, for single tube tower body reinforcing, the single tube tower body reinforcing device includes: single tube tower cantilever beam node, cable, cable top fixed node, cable bottom fixed node;The cable is arranged in double hyperbolic paraboloid shape around single tube tower body;The upper end of the cable is fixed by cable top fixed node;The lower end of the cable is fixed by cable bottom fixed node;The single tube tower cantilever beam node is set on single tube tower body;The middle of the cable is fixed by single tube tower cantilever beam node.Compared with prior art, the single tube tower body reinforcing device of the present application has the advantages of lower reinforcing cost, smaller reinforcing floor area, simpler reinforcing method, stronger operability, obvious effect on the overall stiffness of single tube tower, good appearance, etc.

The invention discloses a steel bridge deck pavement structure suitable for heavy traffic and a pavement method thereof, and belongs to the field of steel bridge deck pavement. Comprising an anti-corrosion layer, a high-performance stress dispersion layer, a waterproof bonding stress absorption layer and a modified asphalt concrete wearing layer which are sequentially laid on the upper surface of a steel bridge deck slab. Therefore, the comprehensive performance of impact resistance, deformation resistance, aging resistance and the like of the whole pavement structure reaches a relatively high level. By arranging the high-performance stress dispersion layer, the pressure of vehicle loads on the steel bridge deck is dispersed, local stress concentration caused by the wheel load effect is greatly reduced, and the fatigue cracking problem of the orthotropic bridge deck is relieved; by arranging the waterproof bonding stress absorption layer, the interface bonding strength and shear strength between the high-performance stress dispersion layer and the modified asphalt concrete wearing layer are enhanced, lower cracks can be prevented from being reflected to the modified asphalt concrete wearing layer, and the service life of the steel bridge under heavy traffic is prolonged.

The invention discloses an anti-progressive-collapse reinforcement design method for a steel support, belongs to the field of buildings, and solves the problem of how to design the steel support for progressive collapse. The method comprises the following steps: calculating a limit load beta max of a structure, and defining a critical load coefficient lambda as a ratio of a design load to the limit load; assuming that the number of the supports is k, the bearing capacity provided by a single support is (1-lambda) * (1.2 DL + 0.5 LL) / k; according to the method, a reinforced column and another adjacent column are dismantled at the same time, and the bearing capacity provided by a single support in different working conditions is calculated; the maximum bearing capacity max [(1-lambda) * (1.2 DL + 0.5 LL) / k] provided by a single support in all working conditions is obtained, and the axial force of the single support can be obtained according to a structural mechanics formula; and checking calculation and model selection are carried out on a single support section according to 'Steel Structure Design Standard' (GB 50017-2017).

The invention discloses a modularly assembled power transmission line tower structure, relates to the technical field of power transmission line tower structures, and is mainly used for solving the problems that a tower body of an existing power transmission line tower is poor in stability, and the construction quality of the power transmission line tower located in a field remote area is difficult to guarantee. According to the main structure, the tower comprises a tower body and a concrete base, the tower body comprises a plurality of tower body units which are sequentially arranged from top to bottom, each tower body unit comprises a core tube module and a plurality of main rod modules arranged around the core tube module, the core tube modules and the main rod modules in the tower body units are connected through connecting angle steel, and the adjacent main rod modules are connected through connecting angle steel. And the adjacent tower body units are coaxially and detachably connected through the connecting flange plates. The invention provides a modularly-assembled power transmission line tower structure which can improve the overall stability and lateral rigidity of a power transmission line tower and improve the construction efficiency through a rapid assembly technology among modules.

The embodiment of the invention provides a high-rise steel structure stacked box energy dissipation and vibration reduction building. The high-rise steel structure stacked box energy dissipation and vibration reduction building comprises steel structure module bodies, steel structure module boxes, combination columns, connecting assemblies and energy dissipation shear wall bodies. The steel structure module body is formed by stacking the steel structure module box bodies, and every two adjacent steel structure module box bodies are connected through the corresponding connecting assembly. The energy dissipation shear wall bodies are vertically arranged on the steel structure module body in a crossed mode. The combination columns are fixedly connected to the steel structure module box body. In the embodiment of the invention, the energy consumption shear wall bodies are vertically arranged on the steel structure module main body in a crossed manner to form a cross-layer diagonal bracing force transfer system, and the combination columns are arranged on the steel structure module box body, so that the lateral stiffness and the force transfer efficiency of the whole structure are remarkably improved; the wind vibration and earthquake response of the whole structure are restrained, and meanwhile the uneven structural rigidity distribution is effectively reduced.

The invention relates to the technical field of articulated vehicle steering, aims to solve the problems that an existing hydraulic steering system is high in energy consumption, low in precision, slow in response, insufficient in transverse rigidity, prone to causing vehicle body oscillation and the like, and discloses drive-by-wire electromechanical steering equipment and method for an articulated mining vehicle. The required torque is calculated by the data processing terminal and then is transmitted to the inverter through the CAN bus so as to drive the servo motor; the servo motor drives the enveloping worm through the planetary reduction gear, so that the turbine set is driven, and steering of the rear vehicle body of the hinged type mining vehicle relative to the front vehicle body of the hinged type mining vehicle is achieved. The system has the advantages of energy conservation, high efficiency, accurate response, high stability, fault redundancy capability, simplified structure and low maintenance cost, and the steering performance and reliability of the articulated mining vehicle under severe working conditions are remarkably improved.

The invention relates to the technical field of rocket single-machine vibration reduction, and discloses a rocket single-machine vibration reduction device, a carrier rocket and a rocket single-machine vibration reduction method.The rocket single-machine vibration reduction device comprises a connecting piece, a first vibration reduction assembly and a second vibration reduction assembly, a first connecting hole is formed in a single machine, and the connecting piece penetrates through the first connecting hole and is detachably connected with a support; the first vibration reduction assembly comprises a first axial vibration reduction pad and / or a first lateral vibration reduction pad, the second vibration reduction assembly comprises a second lateral vibration reduction pad and a first limiting pad which are arranged on the periphery of the connecting rod in a sleeving mode, and a first flange is arranged on the periphery of the first limiting pad in the single machine direction in an extending mode. The carrier rocket comprises the rocket stand-alone damping device. The rocket single machine vibration reduction method comprises the steps that a target single machine and a target support are assembled, the installation frequency of the target single machine is obtained and compared with the preset installation frequency, and a first axial vibration reduction pad and a first lateral vibration reduction pad are increased or decreased according to the comparison value. And the damping effect is good, and follow-up adjustment and optimization are facilitated.

This application provides a heat-absorbing tower structure system for a tower-type solar thermal power plant, including a heat absorber, a concrete cylinder, a vertical cylinder, a steel frame, a reinforcing mechanism, a first connecting mechanism, and a second connecting mechanism. The vertical cylinder is located within the cavity of the concrete cylinder and partially extends out of the concrete cylinder. The steel frame is positioned above the concrete cylinder and surrounds the outside of the vertical cylinder, and the heat absorber is located within the steel frame. The reinforcing mechanism connects the concrete cylinder and the steel frame to restrict the movement of the steel frame relative to the concrete cylinder, achieving vertical conversion of the steel-concrete structure. The first connecting mechanism fixes the concrete cylinder and the vertical cylinder to form a rigid horizontal connection for the lower tower body. The second connecting mechanism connects the steel frame and the vertical cylinder, allowing for relative horizontal displacement within a preset range. This heat-absorbing tower structure system has high stress coordination and deformation compatibility, can reduce construction costs, and meets the requirements of high reliability, lightweight, and stable support for the heat-absorbing tower of a tower-type solar thermal power plant.

The invention relates to an instantaneous large overload resistant spacecraft structure, which comprises: a main body structure, which comprises a plurality of bearing columns, the outer surfaces of which define a revolution body and are configured to bear an overload impact force; the support beams are arranged between every two adjacent force bearing columns and are configured to provide mounting points for the single aircraft; the end connecting structures are located at the two ends of the main body structure and provided with first threads. The spacecraft structure adopts a gyration body configuration, the stability and strength of the structure are effectively improved, the transverse rigidity of the structure is increased through the gyration body structure, the pointing precision of the spacecraft is effectively improved, the critical yield load coefficient of the structure is increased, and the problem that the structure is damaged due to configuration instability when subjected to large overload impact is solved; and uniform stress of the structure is ensured when the structure bears instantaneous overload, and damage caused by stress concentration is avoided.

The invention discloses a large-span overhanging ridgeline reverse curved double-slope diamond lattice shell system adapting to high drop, comprising a roof structure, a concrete structure and a vertical member connecting the roof structure and the concrete structure; the roof structure is in the form of a single-ridge reverse curved double-slope structure, which extends perpendicularly to the ridgeline direction to the building boundary end as a low zone; the vertical member comprises a first lateral resistance member arranged in the low zone of the roof structure, a second lateral resistance member and an internal vertical steel column arranged inside the roof structure, and a peripheral vertical steel column arranged along the outer contour of the roof structure; the first lateral resistance member comprises an inter-column support column arranged in the corner area of ​​the roof structure, a horizontal brace connected between adjacent inter-column support columns, a cross diagonal brace connected between the inter-column support columns and located at the upper and lower parts of the inter-column support columns, and a parallel diagonal brace connected between the inter-column support columns and located in the middle area of ​​the inter-column support columns. The present application has the advantages of stable structure, convenient construction and low cost.

The invention discloses a static and dynamic load control system and method for a ground-anchored space cable three-tower suspension bridge. The system comprises a ground-anchored space cable three-tower suspension bridge and a static and dynamic load control unit arranged on the ground-anchored space cable three-tower suspension bridge; the ground-anchored space cable three-tower suspension bridge comprises a main beam, a middle tower, side towers, transition piers, anchorages arranged on the main beam, and a spatial linear main cable arranged on the anchorage and the main beam; the static and dynamic load control unit comprises a shock-absorbing and energy-absorbing longitudinal limiting support arranged between the middle tower and a transverse connecting box on the main beam along the longitudinal bridge direction, a shock-absorbing and energy-absorbing wind-resistant support respectively arranged between the middle tower and the side tower and a steel box beam on the main beam along the transverse bridge direction, and a vertical support arranged at the junction of the transition pier and the steel box beam on the main beam; the flutter and wind-resistant stability of the whole bridge is improved by the spatial linear main cable; the longitudinal energy absorption capacity of the bridge is improved by the shock-absorbing and energy-absorbing longitudinal limiting support; and the transverse shock-absorbing capacity of the bridge is improved by the shock-absorbing and energy-absorbing wind-resistant support.

The utility model discloses an electromagnetic shielding wire duct of a building structure, which comprises a steel reinforced concrete duct body constructed on the building structure, a wire box arranged in the steel reinforced concrete duct body, a metal shielding net covering an opening of the wire box, and a grounding wire connected to the metal shielding net, a plurality of diagonal bracings which are horizontally supported at the opening of the wire box are arranged below the metal shielding net, and a wire duct cover plate is arranged above the metal shielding net. According to the utility model, electromagnetic signals can be shielded, electromagnetic interference can be avoided, the signal transmission quality of wires and cables in the trunking can be improved, the structural strength of the trunking can be improved, the structural deformation of the trunking can be reduced, the risk that the trunking is damaged can be reduced, and externally input current and voltage signals can be released; therefore, safety protection is carried out on electric wires and cables in the wire duct from a plurality of angles.

The present invention provides a telescopic and foldable multi-section working arm, comprising a base, a primary arm, a secondary arm, a tertiary arm, a quaternary arm, a quintuple arm, a primary telescopic driving component, a secondary telescopic driving component, a tertiary telescopic driving component, a quaternary telescopic driving component, an end rotating arm, a connecting rod, a pulling rod, an articulated sliding sleeve and a sliding sleeve locking pin. The lower end of the primary arm is hinged on the base, and a connecting interface of a task execution module is arranged at the front end of the quintuple arm; the primary arm, the secondary arm and the tertiary arm are hinged end to end in sequence, the quaternary arm is embedded in an inner cavity of the tertiary arm and can be telescoped therein, and the quintuple arm is hinged at the protruding end of the quaternary arm; the working arm of the present invention has certain versatility, and different task execution modules are added to the front end of the quintuple arm, and the base is installed on different carriers, so as to realize different task functions, and through multiple folding and nesting of components and making full use of the space between the components, the overall configuration can be greatly condensed to form a compact and regular storage form.