92 results about "Concrete cover" patented technology

The invention provides a maglev traffic track connecting structure, a maglev traffic track and a construction method of the maglev traffic track. The connecting structure comprises a penetrating type sleeve, a long bolt, an elastic cushion set and a fastening assembly. The penetrating type sleeve penetrates in the thickness direction of the concrete cover plate. The long bolt sequentially penetrates through the track, the penetrating type sleeve and the induction iron core. The elastic pad set comprises a first elastic pad arranged between the top end of the penetrating type sleeve and the induction iron core and a second elastic pad arranged between the bottom end of the penetrating type sleeve and the track. The fastening assembly comprises a nut in threaded fit with the end of the long bolt, and the rail and the induction iron core are fixed to the upper side and the lower side of the concrete cover plate by screwing the nut. The connecting structure is simple and reliable, good in stress condition and convenient to operate and maintain. On one hand, the track is tightly attached to the bottom end face of the concrete cover plate, the stress condition of the long bolts is good, and shear failure is not prone to occurring. And on the other hand, on the basis of realizing adjustable precision, the replacement difficulty and cost of the induction iron core and the track are relatively low.

The invention relates to the technical field of concrete detection, in particular to a concrete protective layer void detection method and system based on a detachable piezoelectric ceramic sensor and an electromechanical impedance resonance technology. The detection method comprises the following steps: temporarily fixing a detachable piezoelectric ceramic sensor on a detection point on the surface of a concrete structure; applying an alternating-current sweep-frequency voltage to excite the piezoelectric ceramic sensor, and obtaining an electromechanical impedance signal frequency spectrum; the electromechanical impedance signal frequency spectrum is analyzed, the frequency of a local defect formant is obtained, and according to the frequency of the local defect formant, geometric parameters of a void area are estimated through a defect size and frequency relation model; and moving the sensor and repeatedly detecting other detection points. The detection method has high efficiency and flexibility, and detection can be realized in any environment; the single-point detection speed is high, the efficiency is high, baseline data is not needed for detection, the anti-interference performance is high, and rapid positioning and quantitative evaluation of void damage can be achieved.

The utility model discloses a prefabricated reinforced concrete cover plate device, which relates to the technical field of concrete cover plates and comprises a concrete cover plate main body, splicing components are arranged on the periphery of the concrete cover plate main body, and a plurality of concrete cover plate main bodies can be spliced with one another conveniently. The splicing assembly comprises a transverse concrete connecting plate, a transverse concrete splicing plate, a longitudinal concrete splicing plate and a longitudinal concrete connecting plate, and the transverse concrete connecting plate, the transverse concrete splicing plate, the longitudinal concrete splicing plate and the longitudinal concrete connecting plate are arranged on the periphery of the concrete cover plate body respectively. According to the concrete cover plate, the transverse concrete connecting plates, the transverse concrete splicing plates, the longitudinal concrete splicing plates and the longitudinal concrete connecting plates are fixedly welded to the periphery of the concrete cover plate body respectively, and the pouring splicing plates are inserted into the corresponding inserting grooves; therefore, a plurality of adjacent concrete cover plate main bodies are combined and spliced, and the application range is expanded.

This invention discloses a method for evaluating the flexural bearing capacity of asymmetric corroded reinforced concrete (RC) columns, comprising: determining the corrosion rate of each steel bar within the cross-section of the corroded RC column; determining the asymmetric corrosion rate of the tension and compression steel bars within the cross-section of the corroded RC column by combining the corrosion rate and the direction of seismic action; determining the mechanical property degradation model of the tension-side corroded steel bars, the compression-side corroded steel bars, and the concrete cover based on the asymmetric corrosion rate and the performance parameters of the steel bars; establishing the equilibrium equation of the control section by combining the direction of seismic action, based on the asymmetric corrosion rate and the mechanical property degradation model; and obtaining the RC column under different axial forces by iteratively solving the equilibrium equation. N u Flexural bearing capacity under M u Thus, the rusted RC column was obtained. N u - M u Correlation curves and the compression-bending capacity envelope of corroded RC columns are presented; the compression-bending capacity performance of corroded RC columns is evaluated based on the compression-bending capacity envelope. This invention can accurately assess the residual capacity of non-uniformly corroded RC columns.

The utility model relates to the technical field of building construction, in particular to a planted roof deformation joint waterproof structure, which comprises a deformation joint and backfill soil arranged on two sides of the deformation joint, and is characterized in that gutters are arranged on two sides of the deformation joint, a retaining wall is arranged on one side, far away from the deformation joint, of each gutter, and the backfill soil is arranged on one side, far away from the deformation joint, of each retaining wall. A filter screen is arranged at the top end of the retaining wall, a plurality of drain holes are formed in the retaining wall, an advanced water stop system is arranged at the top end of the deformation joint, a concrete cover plate is arranged above the advanced water stop system, the concrete cover plate can convey and guide water to a gutter to prevent rainwater from submerging the deformation joint, and the gutter can guide and drain the water to a sewer. The situation that the gutter is full of water and spreads to the deformation joint is avoided, the deformation joint can be sealed through cooperation of a V-shaped aluminum plate and a flexible self-adhesion waterproof roll in the advanced water stop system, waterproof sealing is formed, and rainwater is prevented from permeating into the deformation joint.

The utility model discloses a concrete cover prefabricated part mould which comprises a mould frame, a bearing rod, a hollow first cylinder piece and a hollow second cylinder piece, the mould frame is provided with a bottom plate part, a mounting hole group and an annular hole arranged around the bottom plate part, the bottom plate part is provided with an open hole, the mounting hole group comprises at least two mounting holes which are sequentially arranged from top to bottom, and the first cylinder piece and the second cylinder piece are arranged on the bearing rod. The bearing rod detachably penetrates through the corresponding mounting hole, the first cylinder part penetrates through the annular hole in a lifting mode, the second cylinder part penetrates through the open hole in a lifting mode, the second cylinder part and the first cylinder part abut against the upper portion of the bearing rod, and a forming cavity is jointly defined by the inner cylinder wall of the first cylinder part, the bottom plate part and the outer cylinder wall of the second cylinder part; the forming cavity is provided with an upward opening, the bearing rod can be moved from one mounting hole to the other mounting hole, the abutting joint positions of the second barrel piece and the bearing rod and the abutting joint positions of the first barrel piece and the bearing rod both ascend or descend, and the depth of the forming cavity is correspondingly increased or decreased.

The utility model provides a die convenient to disassemble and assemble for a concrete cover plate, and relates to the technical field of concrete cover plate dies. The mold convenient to disassemble and assemble and used for the concrete cover plate comprises a mold plate, a movable pipe is connected into the mold plate in a sliding mode, a fixed pipe is connected to the side end of the mold plate, a baffle ring is connected to the side end of the fixed pipe, a connecting ring is connected into the movable pipe, a spring set is connected between the baffle ring and the connecting ring, and a telescopic cylinder is arranged in the fixed pipe. According to the mold convenient to disassemble and assemble and used for the concrete cover plate, the moving pipe is arranged, the one-way vibrator is started to enable the moving pipe to vibrate when concrete is poured after the mold plates are connected, and vibration is transmitted to the concrete to improve the compactness; the telescopic cylinder is started to apply force to the movable pipe during demolding after concrete is solidified, the formwork is separated through counter-acting force, the formwork abrasion is small during demolding, the damage degree is reduced, the service life is prolonged, the replacement frequency is reduced, the construction cost is reduced, the demolding process is simple, the labor cost and complexity are reduced, and the demolding efficiency is improved.

The invention discloses a construction method for building a ship lock mass concrete structure through bridge demolition components, and relates to the technical field of civil engineering. The method comprises the following steps: screening a concrete T beam or a concrete cover beam in bridge demolition as a precast block, carrying out lossless cutting and hoisting to a pretreatment field, and carrying out zoning, grading and directional scabbling treatment on a contact interface of a component and post-poured concrete, so that a friction gradient is formed on the interface, and the component realizes self-stabilization through friction in the early stage of construction. And then the concrete is poured layer by layer, so that deformation coordination of the new and old concrete is realized in the hardening and temperature deformation stages of the concrete to form an integral ship lock structure. According to the construction method, cooperative work of the prefabricated component and mass concrete is achieved through interface behavior regulation and control, the construction process is simplified, the temperature control anti-cracking performance is improved, and the high-valued utilization level of the bridge demolition component in a hydraulic structure is improved. Meanwhile, resource utilization of the construction waste is achieved, and new material consumption and engineering cost are effectively reduced.

This utility model discloses a fiber-reinforced composite concrete protective and airtight cover for underground utility tunnels, relating to the technical field of underground utility tunnel cover plates. It includes a cover plate support with a groove on its upper surface. A concrete cover plate body is placed inside the groove. The concrete cover plate body includes a protective frame, multiple transverse support ribs, multiple longitudinal support ribs, a heat insulation layer, a composite concrete layer, and an electromagnetic shielding layer. Each transverse support rib is horizontally fixedly connected to the inside of the protective frame, and each longitudinal support rib is vertically fixedly connected to the inside of the protective frame. This utility model uses high-strength steel for the protective frame, combined with a crisscrossing steel reinforcement skeleton (transverse and longitudinal support ribs), and then welds it to form a rigid frame. This effectively disperses the load generated by vehicle traffic or pedestrian trampling, preventing stress concentration that could lead to concrete cracking.

This utility model belongs to the field of bridge pier safety protection and discloses a reinforcement device for bridge piers to resist erosion. It includes a permeable protective barrel, which is fitted around the bridge pier to form an annular cavity. The cavity is filled with a filler material tightly adhering to the outer wall of the bridge pier. The top of the permeable protective barrel is sealed with a concrete cover. The protective barrel is composed of multiple vertically spliced ​​prefabricated sections, each with multiple circumferential openings on its sidewalls. These openings allow water flow to partially penetrate rather than directly impact the bridge pier, effectively dispersing water energy and slowing down the downstream water flow velocity, thereby inhibiting sediment initiation and localized erosion. The filler material fits tightly against the bridge pier, providing lateral support and reinforcement, enhancing the overall stability of the bridge pier. The concrete cover and prefabricated section structure ensure the device's airtightness and modular convenience, facilitating construction, installation, and subsequent maintenance. This device can simultaneously achieve the dual goals of erosion prevention and bridge pier reinforcement, significantly improving the durability and safety performance of the bridge pier and avoiding the limitations of existing technologies with only single functions.

This utility model discloses a device for reinforcing concrete cover with a mesh, comprising a rebar connector, a fixed base, and two sets of adjusting rods. One end of each adjusting rod is symmetrically mounted on the rebar connector, and the other end is connected to the fixed base. The rebar connector is mounted on a rebar cage, and the fixed base is located within the surface of the concrete cover. In use, the adjusting rods can be adjusted in length according to the concrete cover, and the mesh fabric is mounted on the surface of the concrete cover via the fixed base. This structure can improve the peel resistance of the mesh fabric on the concrete cover, enhance the crack resistance of the concrete cover, and improve the integrity of the rebar cage and the concrete cover, as well as the quality of the reinforced concrete structure.

The utility model discloses a reinforced protection layer thickness multi-point caliper relates to building construction detection tool field. It includes long strip board body shape main ruler body, movable ruler subassembly and angle measurement subassembly, and the main ruler body front surface is equipped with 0 40mm range 1mm graduation main scale and has been opened and has gone through the slot, and movable ruler subassembly contains first movable ruler and second movable ruler, and first movable ruler has 0 20mm range 1mm graduation first auxiliary scale and one end is the sharp head structure, and one end of second movable ruler is V-shaped fork structure, and both are through bolt nut combination and are fixed with the main ruler body sliding connection and have gone through the slot, and angle measurement subassembly is located at the main ruler body back, and contains the sector dial with 0 180 DEG scale and rotatable pointer. The main ruler body, first movable ruler, second movable ruler adopt stainless steel material. The caliper can accurately measure the reinforced protection layer thickness and angle, and the operation is convenient, and the durability is strong, can satisfy the building construction detection demand.

The invention discloses a reinforcing mesh and shear nail combined three-dimensional system applied to building terrace and bridge deck pavement, which comprises a reinforcing mesh and a shear nail component, the shear nail component comprises a shear nail cap, a shear nail body and a shear nail connecting piece, the reinforcing meshes vertically cross and penetrate through the side holes of the shear nail connecting pieces to be fixedly connected with the shear nail components; the shear nail components are divided into an integral type and an assembled type, the integral type shear nail components and the reinforcing meshes are welded and fixed through the shear nail connecting pieces to form a standardized three-dimensional unit module, module hoisting and module connection are rapidly carried out, the shear nail connecting pieces replace binding construction at the positions of reinforcing steel bar intersection points, and the construction efficiency is improved. And spacing and positions of the steel bars are controlled. The thickness of the concrete protection layer is accurately controlled, the reinforcing mesh is supported and positioned, the cracking risk is effectively reduced, and the wear resistance, pressure resistance, fatigue resistance and impact resistance of building terraces and bridge deck pavement are improved.

The application discloses a kind of bank protection reinforcement methods using prefabricated cover plate underwater pressure grouting, it is related to bank protection reinforcement technical field.The method includes the following steps: adding sheet pile outside original bank protection bottom plate;Prefabricated concrete cover plate with pressure grouting hole and pre-buried grouting sleeve;High-elastic rubber pad with opening is added at the bottom of cover plate;Install lifting frame and make its top expose above normal water level;Cover plate is hoisted to the above sheet pile and original bank protection bottom plate, utilize the compression deformation sealing underwater grouting area to be injected of cover plate dead weight and rubber pad, form local closed space;Finally, through the guide of lifting frame, grouting pipe is inserted into pre-buried sleeve from above water surface and carries out underwater pressure grouting.The application is combined by cover plate, rubber pad and grouting sleeve, effectively isolates water flow scouring, maintains stable grouting pressure, adapts to construction error, realizes accurate grouting, converts underwater key operation into water construction, greatly improves construction convenience and safety.

The utility model provides a detachable concrete cover plate hoisting structure which comprises a plurality of sleeves pre-buried in a concrete cover plate, a cover sealing assembly or a hoisting assembly is detachably connected in the sleeves, the hoisting assembly comprises a connecting rod and a lasso, one end of the connecting rod is detachably connected with the sleeves, the other end of the connecting rod is fixedly connected with the lasso, and the lasso is fixedly connected with the cover sealing assembly or the hoisting assembly. The lifting requirement of the cover plate is met, the cover sealing assembly can be arranged without dismounting the lifting assembly during lifting, traveling vehicles or pedestrians can conveniently go on the cover plate, and meanwhile the risk that the lifting assembly is artificially damaged is avoided.

The utility model discloses a composite geomembrane joint structure at a joint part of an anti-seepage wall. An upper anti-seepage structure is poured and solidified above the anti-seepage wall and comprises a concrete cap, plastic concrete and a composite geomembrane; the plastic concrete is located in a groove formed in the middle of the top face of the diaphragm wall, the concrete cap is located above the plastic concrete and the diaphragm wall, and the geomembrane penetrates from the middle of the top face of the concrete cap to the middle of the bottom face of the plastic concrete and is consolidated. The upper anti-seepage structure is provided with a plurality of geomembrane seam structures at intervals in the longitudinal direction of the concrete anti-seepage wall, and the geomembrane seam structures comprise connector seams formed in the longitudinal direction of the anti-seepage wall of a concrete cover cap at intervals, geomembranes are in a folded state in the connector seams, and foam plates are embedded into the two ends of the connector seams. And a water stop plate is longitudinally embedded between the geomembrane and the concrete cap along the downstream side of the river. The foam board, the water stop board, the connecting rod, the gravel and other structures are added to the pouring type connector, the joint of the geomembrane is prevented from being damaged, and the connection problem of the adjacent concrete caps is solved.

A kind of sliding formwork steel bar spacing and concrete cover thickness control device, belong to the technical field of water conservancy and hydropower engineering construction, including positioning angle steel, the positioning angle steel is fixedly connected on jack crossbeam, several positioning blocks evenly arranged are connected on the positioning angle steel along its length direction, positioning hole is opened in the positioning block, the hole wall of the positioning hole is recessed to form recess, several ball bearings are arranged in the recess along its circumferential direction.The positioning angle steel and the positioning hole in the utility model are arranged to accurately control the steel bar spacing and the concrete cover thickness, at the same time, the setting of ball bearing also avoids the steel bar that is inserted into positioning hole from being jammed, to ensure that the quality of sliding formwork construction concrete meets the design standard.

The invention discloses a steel-concrete structure building fold line curtain wall fixing structure and a construction method thereof. The steel-concrete structure building fold line curtain wall fixing structure comprises a steel beam, a steel square box, a plurality of anchor bars, a bracket, a concave point adapter, a curtain wall convex point stand column, a curtain wall concave point stand column, a floor bearing plate and concrete. The anchor bars are connected to the steel square box. The bracket is connected to the steel square box and the steel beam and located on the side, away from the anchor bar, of the steel beam. The concave point adapter is connected to the steel beam, and the extension length of the concave point adapter is smaller than that of the bracket in the direction perpendicular to the steel beam. The curtain wall convex point stand column is connected to the end of the bracket, the curtain wall concave point stand column is connected to the concave point adapter, and the floor support plate is located on the side, provided with the anchor bars, of the steel beam. The concrete is poured on the floor support plate, covers the anchor bars and is fixedly connected with the steel square box. In the invention, the structures such as the steel beam, the steel square box, the anchor bar, the bracket and the concave point adapter can be assembled and formed in a factory in advance, so that the assembly precision is improved, the operation complexity of site construction is reduced, and the assembly efficiency is obviously improved.

The utility model provides a double-wall sandwich insulation board and a forming system thereof, and belongs to the field of insulation laminated wallboards, the double-wall sandwich insulation board structurally comprises a supporting keel, an insulation board, a structural net and a concrete covering layer, the supporting keel is at least provided with two rows of through holes and two rows of positioning pieces, and the positioning pieces serve as positioning installation pieces of the insulation board on one hand and serve as positioning installation pieces of the insulation board on the other hand; on the other hand, the positioning pieces are used as tying pieces of the concrete covering layers on the two sides, and the wall bodies on the two sides are tied to form an integrated double-wall structure through the bolting effect of the positioning pieces and the concrete covering layers on the two sides and the cooperation of the supporting keels; the through holes facilitate the installation of the structural net and can also be used as through connecting ports for supporting the concrete covering layers on the two sides of the keel; according to the scheme, structural net mounting pieces such as wires and mounting nails are not needed, and the strength of the whole plate is higher through cooperation of the supporting keels and the concrete covering layer.

This invention provides a dynamic intelligent temperature control device for large-volume concrete and its usage method, belonging to the field of dynamic intelligent temperature control technology for concrete. It includes a base plate with a water distribution plate installed on one side. The water distribution plate has an outer ring pump connection hole and an inner ring pump connection hole sequentially opened from top to bottom. This invention uses an outer ring wireless flow regulating valve and an inner ring wireless flow regulating valve. When the concrete covers the cooling water pipe, the outer and inner ring wireless flow regulating valves begin to flow water, and the wireless flow meter starts counting the flow rate and simultaneously sends the information to a data relay station. During the concrete cooling stage, the cooling water flow rate changes accordingly according to the cooling rate until it automatically shuts off. Wireless temperature sensors and wireless temperature and humidity sensors are placed at the locations where measurements are needed to collect on-site data. When the equipment is not in use, the wireless temperature sensors and wireless temperature and humidity sensors can be pre-charged using an internally installed battery.

This utility model discloses a concrete slab production pouring equipment, including a traveling vehicle and a support frame. The support frame is installed on the outer wall of the traveling vehicle, and an integrated frame is installed at the bottom of the support frame. A mixing tank is installed at the top of the traveling vehicle. A reciprocating screw is installed inside the integrated frame and is movably connected to the integrated frame. A servo motor is installed on the side wall of the integrated frame, and the output end of the servo motor is connected to the reciprocating screw. A threaded sleeve is fitted on the surface of the reciprocating screw and is threadedly connected to the reciprocating screw. A placement plate is installed on the side wall of the threaded sleeve. This utility model not only realizes convenient circumferential rotation and scraping to clean the concrete on the inner wall of the mixing tank to prevent concrete from adhering to its inner wall, but also facilitates the reciprocating movement and uniform spreading of concrete and the smoothing of concrete in the mold, thus improving the efficiency of concrete slab production.

The utility model relates to a self-locking type concrete cover plate lifting appliance, and belongs to the technical field of building engineering lifting equipment. The device comprises a vertical rod, a transverse rod, a magnetic force adjusting mechanism and a fixing device, wherein the transverse rod is hinged to the vertical rod through a first rotating shaft, and the asymmetric end of the transverse rod is provided with a first magnetic block; the interior of the vertical rod is hollow, a rotatable second magnetic block is arranged in the vertical rod, the magnetic pole direction between the two magnetic blocks is adjusted through a top knob, and the transverse rod is controlled to be vertically inserted or horizontally locked; the fixing device comprises an inverted-cone-shaped clamping groove and an elastic fixing plug, the fixing plug is extruded by pressing a fixing rod downwards, and the rotating shaft is locked to prevent mistaken switching of magnetic poles. According to the device, the state conversion of the cross rod is realized through the switching of magnetic attraction and magnetic repulsion, the cross rod can be manually shifted below the cover plate for disassembly after hoisting, remote unlocking can also be realized by rotating the knob above the cover plate, and meanwhile, the elastic fixing plug forms shockproof friction locking, so that no accidental unhooking in the hoisting process is ensured.

The utility model discloses a connecting structure of an isolation seam cover plate of a seismic isolation structure, which belongs to the technical field of constructional engineering and comprises a first wall body and a second wall body which are arranged at an interval to form a seismic isolation seam, a cast-in-place concrete lifting lug is arranged on the outer side of the first wall body, and a plurality of embedded screws are embedded in the cast-in-place concrete lifting lug; a prefabricated concrete cover plate is further included, pin key preformed holes are formed in one end of the prefabricated concrete cover plate, and the number and the positions of the pin key preformed holes correspond to those of the embedded screws; the pre-embedded screws are inserted into the pin key reserved holes, and connection of the prefabricated concrete cover plate and the cast-in-place concrete lifting lugs is completed; the other end is connected to the top of the second wall. The first wall body, the concrete of the cast-in-place concrete lifting lugs and the reinforcing steel bars are used for supporting and resisting shearing on vertical force, the supporting and shearing resisting effect is far higher than that of bolts, enough supporting force can be provided for the prefabricated concrete cover plate, and the prefabricated concrete cover plate is prevented from falling; compared with a steel structure, the concrete structure has the advantage that the material cost and the manufacturing process can be reduced.

The utility model discloses a pervious concrete cover plate, and particularly relates to the technical field of cellar well lids, which comprises a concrete well lid, a plurality of pervious grooves are arranged on the concrete well lid, the bottom of the concrete well lid is connected with a water guide tank through bolts, the water guide tank is positioned below at least one pervious groove, and a drain hole is arranged at the bottom of the water guide tank. A hollow floating disc is arranged in the water guiding box, a guiding rod is fixedly connected to the bottom of the hollow floating disc, one end of the guiding rod movably penetrates through the bottom of the water guiding box, a buffering connecting assembly is arranged on the hollow floating disc and comprises a sealing box, a rotating rod is rotationally connected into the sealing box in a sealed mode, and one end of the rotating rod extends to the outer side of the sealing box. A tension spring is hooked in the sealing box, and one end, back on to the sealing box, of the tension spring is hooked on the rotating rod; the utility model solves the technical problem that the safety performance is insufficient due to the fact that the cellar well cover is not provided with an effective warning structure to realize the marking of the position of the well mouth.

The application relates to a protection structure of an anti-seepage geomembrane on the surface of a rock-fill dam, which comprises a cushion layer, a pervious concrete cushion layer, a geomembrane and a concrete cover plate, the cushion layer is laid on the upstream side of the rock-fill area of the rock-fill dam, the pervious concrete cushion layer is cast on the surface of the cushion layer and serves as the lower protection layer of the geomembrane, the geomembrane is laid on the surface of the pervious concrete cushion layer, the concrete cover plate is formed on the surface of the geomembrane by concrete upward spraying, the concrete cover plate comprises a plurality of regular polygonal subblocks, there is a preset gap between two adjacent regular polygonal subblocks, and a closed-cell foam plate is filled in the gap; the operation and maintenance of the protection structure of the anti-seepage geomembrane on the surface of the rock-fill dam are more convenient, the construction efficiency on the dam surface slope can be improved, and the risk of the geomembrane being broken by pounding can be reduced.

The utility model discloses a kind of UHPC cable manhole covers, including the cover plate body made of UHPC, multiple groups of reinforcement cage are pre-buried along length direction in the cover plate body inside, and reinforcement cage includes longitudinal main reinforcement and transverse distribution reinforcement;Anti-skid texture is equipped on the upper surface of cover plate body, and sealing groove is equipped on the side surface of four around, and rubber sealing strip is adaptively installed in sealing groove;Hoisting connecting part is equipped on the side surface of both ends of the short side of cover plate body;Reserved mark area is on the upper surface of cover plate body, multiple groups of reinforcing ribs are arranged along width direction in the cover plate body inside, and drainage groove is set up on the upper surface, the utility model uses UHPC material, compared with traditional concrete, high in strength, good in durability, under the premise of guaranteeing cover plate strength, cover plate thickness can be appropriately thinned, effectively reduce dead weight, after testing, the utility model cover plate body compared with same size ordinary concrete cover plate dead weight lightens 30%-40%, convenient to carry and install, reduce construction difficulty and labor intensity;Meanwhile, the high durability of UHPC makes cover plate long-term use under harsh environment, reduces maintenance replacement frequency, reduces whole life cycle cost.

This disclosure relates to the field of construction, and more particularly to a pre-embedded inflatable bladder cast-in-place reinforced concrete hollow wall and its construction process. The hollow wall includes a wall formwork, a reinforcing mesh, an inflatable bladder, horizontal tie bars, a second reinforcing mesh, another wall formwork, and a concrete cover. The horizontal tie bars are configured to connect with the first and second reinforcing meshes. The concrete cover is poured to fill the area between the first and second wall formworks. The inflatable bladder has a bonding area and multiple air chambers. The multiple air chambers are connected by the bonding area to form a whole. Multiple vertical through holes are formed within the bonding area. The horizontal tie bars pass through the through holes. The inflatable bladder also includes multiple positioning rods. The positioning rods protrude vertically from the plane of the inflatable bladder. The first end of the positioning rod is connected to the center of the air chamber, and the second end of the positioning rod can abut against the first or second wall formwork. The positioning rods have fixing holes. The positioning rods are tied and fixed to the first or second reinforcing mesh through the fixing holes.

The utility model discloses a concrete pouring structure of a super-large-span prestressed steel box concrete cover beam. The structure is provided with a steel box and a V-shaped funnel, and a pouring hole and an exhaust hole are reserved in a top plate of the steel box; the bottom of the V-shaped funnel is connected with a capping beam pouring hole, no gap exists, and concrete enters the box through the funnel. The problems that in the concrete pouring process of the prestressed steel box concrete cover beam, lateral deformation of a steel box is large, and concrete pouring is not compact are mainly solved. According to the mode, pouring holes and exhaust holes are mainly formed in a top plate of the bent cap steel box to ensure that concrete is densely poured in the closed steel box, blocking measures are arranged to prevent the concrete from polluting the steel box, and the out-of-plane stability in the concrete pouring process of the bent cap steel box is ensured by controlling the pouring sequence; and an efficient, safe and environment-friendly construction method is provided for the super-large-span prestressed steel box concrete cover beam.

The application provides a method for determining the bonding strength of steel bar-concrete after high temperature, comprising: obtaining the mechanical parameters of concrete after high temperature, which include the elastic modulus, tensile strength and ultimate tensile strain of concrete after high temperature; determining the three-section tensile constitutive model of concrete after high temperature according to the mechanical parameters of concrete after high temperature; solving the radius of the concrete cracking area corresponding to the maximum radial stress based on the three-section tensile constitutive model according to the thick-walled cylinder model and the dispersion crack assumption; obtaining the maximum radial stress of the concrete cover on the steel bar after high temperature according to the radius of the concrete cracking area corresponding to the maximum radial stress; and determining the bonding strength of steel bar-concrete after high temperature according to the relationship between the bonding strength of steel bar-concrete and the maximum radial stress. The application can effectively simulate the bonding strength of steel bar-concrete after high temperature, and the prediction result is accurate and practical.

The utility model discloses a concrete cover plate with strong skid resistance, which relates to the technical field of concrete cover plates, and comprises a cover plate body and a well mouth, the bottom end of the cover plate body and the top end of the well mouth are respectively provided with an anti-skid convex block and a limiting convex block, and a fixing mechanism is arranged in the cover plate body. The fixing mechanism comprises a middle through hole, a movable groove, an abutting plate, a sliding rod, a spring, a sunken groove, a water collecting disc and an extrusion block. According to the concrete cover plate with the high skid resistance, the friction force between the cover plate body and a well mouth can be increased by additionally arranging the skid-proof protruding blocks and the limiting protruding blocks, the relative fixing effect is guaranteed, meanwhile, the fixing mechanism is arranged, rainwater is gathered in the water collecting disc, and the water collecting disc, the extrusion block, the sliding rod and the abutting plate are sequentially linked, so that the skid resistance is improved. The abutting plate tightly abuts against the inner wall of the well mouth, the fixing effect of the cover plate body and the well mouth is further improved, the situation that the cover plate body is dislocated and deviated or washed away by rainwater is avoided, and the practicability of the device is improved.