59results about How to "Clear force" patented technology

The utility model relates to a cold-formed thin-walled steel fabricated structural system, and belongs to the technical field of structural engineering. Comprising combined joints, module main beams, module columns and module secondary beams. Column sleeves are arranged at the upper end and the lower end of the combined joint, a center joint is arranged between the column sleeves, horizontal partition plates are welded between the column sleeves and the center joint, a vertical end plate is welded to each side of the outer surface of the center joint, materials such as concrete can be poured into columns, and the bearing capacity and integrity of the combined joint are improved. The connecting sleeve has the beneficial effects and advantages that the connecting sleeve is small in size, light in weight and convenient to transport and hoist, the machining time is greatly shortened, the machining quality is guaranteed, modular design, factory production and specialized installation are integrally achieved through standardized modular production of components and the connecting sleeve, field assembly is simple and efficient, and the production efficiency is improved. The purposes of reducing labor, shortening the construction period and saving cost are achieved, and industrialization development of the fabricated building is promoted.

The utility model provides a prefabricated column and a connecting structure of the prefabricated column and a prefabricated beam, the prefabricated column comprises a column body and a second steel connector arranged on the side face of the column body, and the connecting structure comprises a first steel connector and the second steel connector which are arranged at the beam end; the first steel connector is I-shaped, the pre-embedded upper and lower flanges of the first steel connector are in lap welding connection with the longitudinal bars in the beam, the pre-embedded web plate is provided with a hole and / or a welding stud, and the exposed web plate is provided with a bolt hole; the second steel connector comprises I-shaped steel, an anchor plate and a plurality of anchor bars, the anchor plate and the I-shaped steel are located inside and outside the column respectively, part of the first anchor bar is located inside the column, part of the first anchor bar is located outside the column and is in lap welding with an upper flange and a lower flange of the I-shaped steel, and the second anchor bar is located inside the column and is welded with the anchor plate. The webs are connected through bolts, and stirrups are arranged on the embedded portion of the first steel connector and the connecting area of the two steel connectors respectively. The structure is simple, the steel consumption of the connecting joint can be reduced, and construction is convenient.

The invention belongs to the technical field of road engineering roadbed treatment, and particularly relates to a riprap silt squeezing depth calculation method based on energy conservation. The calculation method comprises the following steps: S1, assuming a simplified calculation working condition, and respectively calculating gravitational potential energy of block stones and soil blocks by taking the block stones and wedge-shaped soil blocks at the lower part after the block stones enter a soil body as research objects; s2, calculating resistance work and buoyancy work of the block stone in water, side soil shear work of the block stone when the block stone moves in the sludge, and soil pressure and shear work of the soil block; s3, establishing a balance equation of the total potential energy and the total resistance acting; and S4, calculating the riprap silt squeezing depth according to the equation. According to the method, the problem of establishment of the balance equation in the overwater riprap process is solved by utilizing the principle of conservation of energy, the design difficulty of engineers and the extra workload of parameter valuing are effectively reduced on the basis of ensuring the calculation requirement, and the scheme decision-making efficiency is favorably improved.

The utility model relates to the technical field of engineering construction, in particular to a connecting structure with adjustable parallel connection length for a few-support system, which comprises a connecting standard pipe fitting and a connecting flange, and the connecting flange comprises a steel hoop used for being arranged on a steel pipe pile or a steel stand column. The two side ends of the steel hoop are each provided with a flange plate used for being connected with the end of a standard pipe fitting. The connecting sleeve is used for connecting two sections of standard pipe fittings to achieve splicing, and anchoring structures used for being connected with the standard pipe fittings to be matched are arranged at the two ends of the connecting sleeve. The connecting structure is convenient to mount and dismount, and welding operation is greatly reduced.

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 invention relates to a large-displacement tensile device and a design method. The tensile device comprises a self-adaptive base, a tensile cable group, a first seat plate and a second seat plate, the self-adaptive base comprises a first tensile base, a second tensile base, a spring base and a self-adaptive spring; the first tensile base is arranged on the first seat plate; one end of the self-adaptive spring is connected with the first tensile base, and the other end of the self-adaptive spring is connected with the spring base; the second tensile base is connected with the second seat plate; and the tensile cable group penetrates through the first tensile base and the second tensile base to form a closed loop. Compared with the prior art, the tensile device can provide good vertical tensile capacity for the support in a limited space of an existing support system, and has the characteristics of multi-directional horizontal large-displacement adaptability, good fatigue resistance and stable and reliable mechanical property.

The utility model relates to a sinking courtyard stair structure which is fixed on an outer wall of a sinking courtyard and comprises a middle frame, stair plates and a platform plate. The middle frame is arranged on one side of the sinking courtyard outer wall in parallel, one sides of the platform plates are connected with the middle frame, the other sides of the platform plates are connected with the sinking courtyard outer wall, the platform plates are distributed on the two sides of the middle frame in a staggered mode, and the stair plates are fixed to the left side and the right side of the middle frame and distributed on the front side and the rear side of the middle frame in a crossed mode. The two ends of the stair plates are connected with the platform plates on the two sides of the middle frame respectively. Compared with the prior art, the utility model has the advantages of reasonable and safe acceptance system, simple structure, wide application range and the like.

The invention discloses an anchoring device for external prestressing reinforcement of a bridge without damaging a beam body, and relates to the technical field of bridge engineering, the anchoring device comprises a concrete T-shaped beam, the two ends of the concrete T-shaped beam are fixedly connected with external prestressing anchoring assemblies respectively, and the external prestressing anchoring assemblies are fixedly connected through external prestressing tendons. According to the anchoring device for external prestressing reinforcement of the bridge without damaging the beam body, drilling and steel bar planting on the existing bridge body are not needed, the beam body is not damaged, the construction speed is high, and stress is clear.

The utility model discloses an assembly type telescopic tower crane man access platform device, including nested keel, cross bracing keel and antiskid steel sheet, the nested keel includes first square tube and second square tube, and the second square tube is inserted to the first square tube, is used for telescopic adjustment nested keel's overall length and is fixed through high -strength bolt connection, and a plurality of cross bracing keels are connected between two nested keels, and the cross bracing keel is flush with the top surface of the nested keel, and the antiskid steel sheet is laid on the nested keel and the cross bracing keel. The utility model solves the problem that traditional tower crane man access builds low efficiency, poor adaptability, insufficient safety, has the advantages of convenient assembly, telescopic adjustable, high reusability, safe and reliable, can be adapted to different models tower crane and construction working condition, effectively promotes construction safety and operation efficiency.

The application discloses a movable bridge deck panel installation platform and a construction method thereof. The movable bridge deck panel installation platform comprises a steel plate leg, an angle steel leg and a steel panel, is installed on the upper side of a bridge deck panel, the steel plate leg and the angle steel leg are supported on a main force component of a steel beam, load is transmitted to the main force component of the steel beam, the safety of the steel beam structure is ensured, a caterpillar crane is moved to the steel panel to perform hoisting operation, direct contact with the bridge deck panel is avoided, bridge deck panel cracking is avoided, compared with a traditional automobile crane or a special frame plate machine, the efficiency is higher and the economy is better, through a construction method of cyclically adopting a hoisting bridge deck panel, installing the movable bridge deck panel installation platform, moving the caterpillar crane to the installation platform, hoisting the next bridge deck panel, space occupation of a construction site is less, and the construction method has the advantages of convenient construction, rapidness, convenience, safety and the like.

The invention discloses an adjustable main buckling integrated type section steel tower cable wind connecting structure and a construction method thereof. The cable wind connecting structure comprises a tower side cable wind buckling and hanging connecting structure, a tower waist cable wind hanging connecting structure and a tower top cable wind connecting structure, and corresponding cable wind ropes, tensioning end universal joints and cable wind ground anchors matched with the cable wind connecting structure, the tower waist cable wind hanging connecting structure and the tower top cable wind connecting structure. The construction method comprises the following construction steps: step 1, calculating the stress of the section steel tower wind cable system; 2, a tower mooring rope anchoring device and a tensioning end are installed before the tower is installed; 3, a tower wind cable system is installed in the tower installation process; 4, the tower wind cable system is tensioned step by step; and 5, in the tower dismantling process, the wind cable system is released, pulled and dismantled step by step. The structure of the technology has the advantages of being simple in structure, safe, reliable, clear in stress, small in steel consumption and capable of adjusting the angle of the cable rope, meanwhile, the method is convenient to assemble and disassemble and high in construction efficiency, it can be guaranteed that the displacement of the section steel tower is within the allowable range when the section steel tower works, and the construction safety risk of tower cable hoisting and cable-stayed buckling operation is reduced.

This invention discloses a bridge pot bearing and control system based on system conversion. A first bearing body and a second bearing body are stacked from top to bottom. The first bearing body has a first mounting plate, and an adjustment component is installed below the first mounting plate. The second bearing body has a second mounting plate, and a test component is installed on the second mounting plate. The test component connects with the adjustment component. While performing pressure testing, the test component, in conjunction with the adjustment component, enables the conversion between three states: fixed pot bearing, unidirectional movable pot bearing, and bidirectional movable pot bearing. This invention monitors the stress on the bearing in real time, calculates the bridge shear force based on the reaction force, and derives the bridge shear force amplification factor under dynamic loads, thus improving bridge design methods and making bridge design safer and more reliable. It can realize the functions of a fixed bearing, a unidirectional movable bearing, or a bidirectional movable bearing, and achieve mutual conversion between bearing types.

The invention discloses a PC prefabricated small box girder top web node reinforcing steel bar structure which comprises top plate horizontal reinforcing steel bars, web U-shaped stirrups, top plate longitudinal reinforcing steel bars, corner longitudinal reinforcing steel bars, web longitudinal reinforcing steel bars and concrete, and reinforcing steel bar arrangement of a small box girder top web node is completed in the mode that top plate reinforcing steel bar meshes and web reinforcing steel bar meshes are manufactured respectively, assembling is conducted, and finally reinforcing steel bar penetrating is conducted. The top plate horizontal steel bars and the top plate longitudinal steel bars form a top plate steel bar mesh, the web U-shaped stirrups and the web longitudinal steel bars form a web steel bar mesh, and the top plate steel bar mesh is hoisted to the web steel bar mesh and then penetrates through the corner longitudinal steel bars to complete small box girder top web node steel bar arrangement. By optimizing the inclined steel bars at the lower corner and reinforcing the longitudinal steel bars at the corner in the traditional design, the top web node steel bars are optimally arranged, the mechanical property of the top web node is improved, meanwhile, the steel bar machining and arranging difficulty is lowered, and the problems that the top web node steel bars are various in specification, low in arranging and mounting efficiency and the like are solved.

The present application relates to the technical field of net rack structure reinforcement, and particularly relates to a welding-free full-assembled net rack rod piece reinforcement device and method. The device comprises: a fixed center bearing frame for reinforcing a circular tube component; a telescopic vertical sliding inclined strut assembly arranged between two adjacent vertical fixed vertical rods; an assembled sectional sleeve assembly for fixing the fixed center bearing frame outside the circular tube component; a cable body for connecting two connecting bases on the fixed center bearing frame; and a tensioning adjusting mechanism for adjusting the tension of the cable body. The welding-free full-assembled net rack rod piece reinforcement device and method provided by the present application adopts a welding-free full-assembled construction process, and the components are standardized prefabricated in a factory. The components are only assembled by bolts and pins at the site, so that the construction is safe and efficient, welding damage is avoided, and the original structure performance is not affected. The components are connected by bolts, so that the components are convenient to disassemble and assemble, the components can be recycled and reused, and the engineering cost is reduced.

The present invention relates to a high-inner-pressure, high-air-tightness, large-span space structure in high-altitude areas. The external structure is a self-balancing structural system formed by a plurality of annular load-bearing components surrounding an intermediate structure along their respective axial arrays; the intermediate structure is fixedly installed in the external structure, and the intermediate structure is assembled by a number of intermediate structural units; the internal structure is attached to the intermediate structure, and a whole air-film structure with high air-tightness is adopted. When the large space is not pressurized, the internal structure can be separated from the intermediate structure. After the large space is pressurized, the pressure makes the internal structure close to the intermediate structure; the external structure is installed on the supporting structure as a whole, does not contact the ground, and the supporting structure is installed on the ground. The large-span space structural system of the present invention is novel and has clear layers. The internal, middle, and external structures form a self-balancing force system, which can withstand a large internal pressure and can be realized by manual handling and assembly. It has a closed and pressure-bearing effect and meets the needs of pressurized oxygen supplementation.

According to the rectangular-section RC column-U-shaped steel reinforced RC beam connection joint reinforcing structure and method, two pieces of channel steel which are symmetrically arranged are bonded to a bonding anchoring area through building structure glue, notches matched with the U-shaped steel reinforced RC beam in section size are formed in flanges of the channel steel, and the two pieces of channel steel are welded at butt joints to form a sleeve; a plurality of preformed holes are formed in each piece of channel steel, and each preformed hole contains a shoot nail connected with the RC column; the U-shaped steel reinforced RC beam is provided with eight pieces of angle steel, and the U-shaped steel on the U-shaped steel reinforced RC beam is connected with the sleeve in a surrounding welding mode to form a beam-column joint reinforced structure. The sleeve and the beam-column joint are bonded and anchored by smearing the building structural adhesive, the shooting nails are adopted for further anchoring, the overall working performance of the sleeve and the beam-column joint is greatly improved, in addition, the U-shaped steel reinforced RC beam and the sleeve are firmly connected through the angle steel in a surrounding welding mode, a beam-column joint reinforcing system is formed, stress is definite, industrial production is facilitated, and the construction cost is reduced. And the building assembly development requirement is met.

The present invention provides a large-span folding arc-shaped tide-blocking floating gate structure and a method for using the same. The structure is a double-door type and includes: two gate reservoirs, which are respectively arranged on both sides of a river channel; two gate units that are symmetrical on both sides, and the gate units are divided into upper and lower layers and can be folded and folded in the gate reservoir. Each gate unit includes an upper tide-blocking floating gate, a lower tide-blocking floating gate and an arc-shaped foundation. The radius of the upper tide-blocking floating gate is larger than that of the lower tide-blocking floating gate. One end of the upper tide-blocking floating gate and the lower tide-blocking floating gate are both hinged in the force-bearing pier on the bank side, and are arranged in different positions and concentrically. The arc-shaped foundation extends from the gate reservoir to the center of the river channel. The upper tide-blocking floating gate and the lower tide-blocking floating gate rotate and move from the edge of the gate reservoir to the center of the river channel around their hinge points along the arc-shaped foundation to unfold. During the tide-blocking operation, the arc-shaped foundation, the upper tide-blocking floating gate, the lower tide-blocking floating gate and the force-bearing pier on the bank side are combined to realize the function of blocking the tide.

The utility model relates to the technical field of concrete pump damping, and provides a vertical pump pipe damping device which comprises a rubber damping ring, a spring connecting rod, an arc-shaped clamping plate and a supporting connecting piece. The rubber damping ring is horizontally arranged, the multiple spring connecting rods are distributed on the inner side of the rubber damping ring in the circumferential direction of the rubber damping ring, the center axis of each spring connecting rod points to the center of the rubber damping ring, one end of each spring connecting rod is connected with the rubber damping ring, and the other end of each spring connecting rod is connected with the corresponding arc-shaped clamping plate. A circular channel is defined by the multiple arc-shaped clamping plates and used for allowing a vertical pump pipe to penetrate through. The outer side of the rubber damping ring is connected with a supporting connecting piece which is used for being connected with a wall or a column or a floor hole of a building. The vibration energy of the pump pipe is consumed through the rubber damping ring, the influence caused by vibration in the concrete pumping process can be effectively reduced, and the concrete forming quality and the stability of an inter-floor supporting system are effectively guaranteed.

The invention discloses a multifunctional bridge with drainage and routing functions, a handrail and a mounting method. The handrail at least comprises a handrail assembly. The handrail assembly comprises a plurality of handrail stand column sets. The upper sections of every two adjacent railing post groups are connected through a railing; each railing post group consists of two railing posts which are arranged in parallel; the two railing posts are connected through bolts; the railing post and the railing water baffle are arranged on the outer side of the lower section of the railing assembly; the drainage bin is arranged at the lower end of the handrail assembly in the length direction of the handrail assembly. The multifunctional bridge handrail can achieve centralized drainage of a bridge floor and hiding and storage of bridge pipelines, is easy to install, attractive in appearance and clear in stress, and can be popularized and applied to pedestrian landscape bridge handrails.

The utility model discloses a kind of kart vehicle body telescopic adjusting devices and kart. The device is applied to the kart vehicle body with front vehicle support and rear vehicle support, load bar is equipped on front vehicle support, hollow sleeve rod is equipped on rear vehicle support opposite to load bar, load bar can slide in axial direction to change the distance between front and rear vehicle support. Adjusting component includes shell body fixed on front vehicle support, direction conversion structure arranged in shell body and screw rod cooperated with nut and sleeve, direction conversion structure is made of meshing gear set, for converting hand lever rotation into screw rod autorotation and driving vehicle body telescopic;Between load bar and hollow sleeve rod is sliding fit, end portion is equipped with limit structure, and scale mark is set on load bar and / or hollow sleeve rod. The kart using the device can conveniently adjust wheelbase within a certain range, adapt to drivers of different heights, with simple structure, low cost, safe and reliable adjustment.

The utility model relates to the field of aircraft body structures, and provides a truss type aircraft cargo hold floor structure and an aircraft, the cargo hold floor structure comprises a fuselage frame, a truss, a floor cross beam, fuselage frame connecting nodes, floor cross beam connecting nodes and a floor; the floor beams are arranged on the upper portion of the machine body frame, and the two ends of each floor beam are fixedly connected with the machine body frame. The truss comprises a plurality of stand columns, one ends of the stand columns are connected with the fuselage frame through fuselage frame connecting nodes, and the other ends of the stand columns are connected with the floor cross beams through floor cross beam connecting nodes. The stand columns can rotate around the fuselage frame connecting joints or the floor beam connecting joints. A triangular structure is formed between every two adjacent stand columns and the machine body frame or the floor beam. According to the utility model, the assembly process is simplified, and the production efficiency is improved. And the connecting rotating shafts are adopted at the connecting positions of the truss, the fuselage frame and the floor cross beam, so that the connecting positions only transmit tension and compression loads, and the situation that the positions are insufficient in connection due to large bending moment of the bottom frame is avoided.

The invention discloses a wall panel connection structure of a thin steel plate shear wall structure, comprising a wall panel, a cover plate and a fish plate; angle steels are arranged at the corners of the wall panel, the upper surface of the wall panel end is arranged with a cover plate, and the lower surface of the wall panel end is arranged with a fish plate, wherein the angle steels, the cover plate, the wall panel and the fish plate are distributed in sequence from top to bottom, and the angle steels, the cover plate, the wall panel and the fish plate are connected, and the structure can realize the effective connection between the thin steel plate and the fish plate in the thin steel plate shear wall structure.

This utility model discloses a crane truss structure with a parallel crane beam as the lower chord, comprising: a lower chord structure, which includes two crane beams arranged in parallel and spaced apart, with multiple upper connecting plates connecting the upper flanges of the two crane beams and multiple lower connecting plates connecting the lower flanges of the two crane beams; the two ends of the crane beams are used to connect to corresponding factory building brackets; an upper chord structure, located above the lower chord structure; and a web member assembly, which includes multiple diagonal web members and multiple vertical web members connecting the upper and lower chord structures, with multiple node structures provided on both the upper and lower chord structures; the two ends of the diagonal web members are connected to the corresponding node structures, and the two ends of the vertical web members are connected to the corresponding node structures. This utility model can solve the problems of existing ultra-large span crane beams having large cross-sectional heights, occupying a large amount of space below the rail surface, affecting the air circulation inside the workshop, using a large amount of steel, having complex stress, and being inconvenient to install.

The utility model discloses a welding tool for a top plate and a bottom plate of a single-box double-chamber steel box girder, and relates to the field of municipal bridge construction. The welding tool comprises a vertical supporting piece and a connecting piece, the vertical supporting piece comprises a vertical connecting piece and a supporting piece, the vertical connecting piece is used for being connected with the connecting piece, and the supporting piece is used for supporting the single web side steel box girder; one end of the connecting piece is used for being connected with a web of the double-web side steel box girder, and the other end of the connecting piece is used for being connected with the vertical supporting piece. The utility model further provides a welding method. According to the steel box girder butt joint device, time waste caused by high-altitude butt joint, seam stacking and other procedures of the steel box girder can be reduced to a great extent, the construction progress is accelerated, and labor is saved. And secondly, due to the increase of the construction time, the construction quality of welding operators is indirectly guaranteed, and the quality defect caused by time scrambling is avoided.

The utility model discloses a cable trench support capable of separating strong current from weak current, which comprises a cable trench and a stress rod, the bottom of the stress rod is fixedly connected with a bottom plate of the cable trench, a reinforcing rod is mounted between the lower part of the stress rod and a side wall of the cable trench, a plurality of cable supports are mounted on two sides of the upper part of the stress rod in a layered manner, and the cable supports are connected with the stress rod. The cable support on one side serves as a strong current line support, and the cable support on the other side serves as a weak current line support. The utility model has the advantages of simple structure, safety, reliability and clear stress, and is particularly suitable for cable trenches with steep slope surfaces, limited space and strong and weak current separation requirements.

The invention belongs to the technical field of high-temperature energy storage, and discloses a high-temperature storage tank composite foundation for a high underground water level. A layer of inner ring beam outer side annular steel plate is laid on the outer side of an inner ring beam, a fireproof ceramic fiber plate is filled between the height range of the inner ring beam and an outer ring wall, and the outer ring wall is placed on a bearing raft; a sliding layer is arranged between the outer ring wall and the bearing raft, a heat preservation layer adheres to the outer side of the outer ring wall, the waterproof cofferdam and the bearing raft are integrally poured together, a waterproof heat preservation layer and a drainage ditch are arranged in the waterproof cofferdam, the drainage ditch is provided with a water collecting pit, and the two sides of the waterproof heat preservation layer are flashed and fixedly connected with the waterproof cofferdam and the bearing raft respectively. A high ring wall protrusion is arranged at the contact position of the bearing raft and the outer ring wall to serve as a sliding step, a reinforced concrete limiting tenon integrally poured with the sliding step is arranged on the inner side of the outer ring wall above the sliding step, four drainage pipes are evenly arranged on the periphery of the top face of the bearing raft, and a ventilation pipe is buried in the bearing raft. Meanwhile, the functions of water resistance, heat preservation, effective temperature stress release and the like are achieved.

This utility model discloses a piston-type pneumatic actuator, including a drive housing and a cylinder housing. The cylinder housing is located on one side of the drive housing, and a drive chamber is provided inside the drive housing. A pressure plate is provided inside the cylinder housing, and an air chamber is provided on one side of the pressure plate. An output shaft is provided on the other side of the pressure plate. The output shaft passes through the cylinder housing and extends into the drive chamber for reciprocating movement. A valve stem is rotatably mounted inside the drive housing, and one end of the valve stem extends into the drive chamber and is connected to a connecting rod. A strip-shaped groove is provided on the connecting rod. A drive block is fixedly connected to the portion of the output shaft located in the drive chamber. A slide rod is provided on the drive block, and the slide rod slides in the strip-shaped groove. The output shaft drives the connecting rod and the valve stem to reciprocate and rotate reciprocally through reciprocating movement. This solution converts linear motion into the reciprocating rotational motion of the valve stem, thereby realizing the opening and closing control of the valve, and has the advantages of smooth movement and fast response.

The utility model discloses a stay cable anchoring structure which is characterized in that a groove is formed in an arch rib wall plate, three force transmission plates are arranged in the arch rib wall plate, and the force transmission plates are welded with the arch rib wall plate; and one end of the lug plate is welded with the three force transmission plates, and the other end of the lug plate is connected with the anchoring stay cable. The stay cable anchoring structure is simple in structure, clear in stress and convenient to construct, and solves the problem of connection between a steel pylon with a complex structure and a stay cable.

The present invention discloses a mobile folding hangar that can be horizontally unfolded and folded, comprising at least two oppositely arranged mobile side walls and a folding roof installed on the top of the mobile side walls, the two sides of the folding roof are hinged to the mobile side walls, a plurality of slides are vertically arranged on the mobile side walls, the lower end of a movable strut is slidably connected in each of the slides, the upper end of the movable strut is hinged to the transverse connecting rod of the folding roof, and the lower end of the movable strut is simultaneously connected to one end of a lifting cable, the other end of the lifting cable is fixedly connected to a lifting cable winch after passing through a lifting cable fixed pulley fixed at the upper end of the slide, when the folding roof is basically unfolded, the lifting cable winch is rotated to move the movable strut upward along the slide, and the folding roof is fully unfolded. The present invention has a fast construction speed, can be walked and moved as a whole, and can be quickly repaired after being damaged.

The steel pipe truss comprises a concrete prefabricated bottom plate (1) and an upper chord steel pipe (2), the left side and the right side of the upper chord steel pipe (2) are each in an arc shape, the upper ends of the arcs on the left side and the right side are connected to form an upper straight line section, the lower ends of the arcs on the left side and the right side are connected to form a lower straight line section, and the lengths of the upper straight line section and the lower straight line section are both 15-80 mm; the prefabricated concrete bottom plate further comprises a web member (3), the web member (3) is formed by continuously bending a hollow steel pipe into a wave shape, the wave crest of the wave-shaped web member (3) is welded to the bottom face of the lower linear section of the upper chord steel pipe (2), and the wave trough part of the wave-shaped web member (3) is buried in the prefabricated concrete bottom plate (1). The hollow web member is creatively welded with the straight section at the bottom of the upper chord steel pipe, and the thickness of the steel plate at the lower straight section of the upper chord steel pipe is increased, so that the defect can be better avoided, and the welding strength is ensured.