CN220665969U - Steel-concrete composite beam panel and UHPC bottom die integrated structure - Google Patents
Steel-concrete composite beam panel and UHPC bottom die integrated structure Download PDFInfo
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- CN220665969U CN220665969U CN202322170599.0U CN202322170599U CN220665969U CN 220665969 U CN220665969 U CN 220665969U CN 202322170599 U CN202322170599 U CN 202322170599U CN 220665969 U CN220665969 U CN 220665969U
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- 239000010959 steel Substances 0.000 claims abstract description 134
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Abstract
The utility model discloses a steel-concrete composite beam panel and UHPC bottom die integrated structure, which relates to the field of bridge energy-saving construction, and mainly comprises the steps of installing a plurality of U-shaped steel beams on a support of a bridge abutment, welding a steel top plate with a certain width and the same length as the U-shaped steel beams on the tops of two sides of each U-shaped steel beam, welding a plurality of shear keys on each steel top plate, installing a UHPC bottom die between the top of each U-shaped steel beam and the steel top plate of each two adjacent U-shaped steel beams, installing bridge deck steel bars and pouring concrete on the UHPC bottom die to form a reinforced concrete bridge deck, and paving an asphalt surface layer on the reinforced concrete bridge deck, wherein an anti-collision guardrail is arranged at the outer end of the upper part of a cantilever bridge deck of the reinforced concrete bridge deck.
Description
Technical Field
The utility model relates to the field of bridge energy-saving construction, in particular to a steel-concrete composite beam panel and UHPC bottom die integrated structure.
Background
The reinforced concrete composite structure is a novel structure developed on the basis of a reinforced concrete structure and a steel structure. Compared with a reinforced concrete structure, the self weight of the structure is greatly reduced, and the crossing capacity of the bridge is improved; compared with a steel structure, the steel consumption is reduced, and the structural rigidity is improved. The steel-concrete combined structure has the advantages of a steel structure and a concrete structure, has obvious technical and economic benefits and energy-saving and environment-friendly benefits, is suitable for the national conditions of basic construction of China, and is one of main development directions of highway and urban overpass structural systems.
The bridge deck board of the existing steel-concrete combined structure is generally formed by erecting a bottom formwork, installing reinforcing steel bars and casting concrete on the top of a steel beam after the steel beam is in place on a bridge pier. The installation and the fixation of the bridge deck floor form are labor-and labor-consuming. Chinese patent application No.: 202310153100.7 the name is "template-free cast-in-situ UHPC steel-concrete combined bridge deck and construction method thereof", mainly the longitudinal steel girder is welded with a dismantling-free pattern steel plate to replace a bottom template, and the structure increases the steel consumption and bridge deck load and the engineering cost. Therefore, in order to embody the bridge construction concept of safety, durability, energy saving, green and sustainable development, a construction method for improving the bridge deck slab with the cast-in-situ reinforced concrete combined structure is very necessary.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art and provide the steel-concrete composite beam panel and UHPC bottom die integrated structure which has the advantages of simple structure, convenient construction, safety, reliability, energy conservation, environmental protection and high cost performance.
The technical problems of the utility model are realized by the following technical scheme:
the utility model provides a steel and concrete composite beam panel and UHPC die block integrated structure, includes the support of bridge pier installs many pin U shaped steel roof beam on, every pin U shaped steel roof beam's both sides top all weld a certain width, and with the steel roof plate of the same length of U shaped steel roof beam, all weld many shear force keys on every steel roof plate, then all install the UHPC die block between the steel roof plate of every pin U shaped steel roof beam's top and every two adjacent pin U shaped steel roof beams to install bridge floor reinforcing bar and concreting on the UHPC die block and form reinforced concrete bridge floor, the last asphalt surface layer that spreads of this reinforced concrete bridge floor, the cantilever bridge floor upper portion outer end of reinforced concrete bridge floor is equipped with the anticollision barrier.
The UHPC bottom die is a splayed folded plate made of ultrahigh-strength and high-durability materials, the splayed folded plate comprises a plane plate, inclined plane plates respectively positioned at two ends of the plane plate and a plurality of rib plates arranged on the bottom surface of the plate, the width of each UHPC bottom die is 80 cm-100 cm, and the length of each UHPC bottom die is matched with the width of the top of each U-shaped steel beam and the distance between two adjacent U-shaped steel beams; the plate end of the inclined plate is a flat-bottom trapezoid, two ends of the end are respectively placed at one side edge of a steel top plate at the top of the U-shaped steel beam, and the edges of the two ends of the end are clung to adjacent shear keys to prevent the UHPC bottom die from sliding.
The U-shaped steel beam is a steel-concrete combined beam groove-shaped steel girder, the steel-concrete combined beam groove-shaped steel girder is manufactured by U-shaped sections in a steel structure manufacturing factory through steel plates, and finished products are transported to a construction site to be assembled and hoisted to a support of a bridge pier; the steel top plate is welded on the top of the U-shaped steel beam and bears shearing force and bending moment.
The thickness of the plane plate, the inclined panel and the rib plates is 1.5 cm-3 cm, and the lengths of the plane plate, the inclined panel, the number of the rib plates and the height of the rib plates are all determined by the width of the top surface of the U-shaped steel beam in the reinforced concrete composite beam and the beam spacing.
The UHPC bottom die is arranged and closely mounted on the main girder of the reinforced concrete composite girder in longitudinal sequence, and adjacent plates are bonded by building glue so as not to leak cement slurry when the reinforced concrete bridge deck is poured.
The shear key is a round head welding nail welded on an upper flange plate of the steel girder, and is arranged in a clustered mode, and the distance is 15 cm-30 cm.
The reinforced concrete bridge deck is in a reinforced concrete structure, and bridge deck steel bars and pouring concrete are arranged on the UHPC bottom die, so that a plurality of U-shaped steel beams are connected together to form a reinforced concrete composite beam structure.
The cantilever bridge deck is a reinforced concrete suspension bridge deck at two outermost sides of the U-shaped steel beam, a part of a UHPC bottom die is taken as a template or a traditional steel template and a traditional wood template are used as the template, and then an ear plate, a bracket and a mounting template are welded at the outer side of a web plate of the U-shaped steel beam.
The asphalt surface layer is asphalt concrete and is paved on the top surface of the reinforced concrete bridge surface; the anti-collision guardrail is of a reinforced concrete structure and is arranged at the outer end of the upper part of the cantilever bridge deck, and is a safety protection facility for bridge operation.
Compared with the prior art, the utility model mainly installs a plurality of U-shaped steel beams on the support of the bridge pier, and welds a steel top plate with a certain width and the same length as the U-shaped steel beams on the tops of both sides of each U-shaped steel beam, and welds a plurality of shear keys on each steel top plate, then installs a UHPC bottom die between the top of each U-shaped steel beam and the steel top plate of each adjacent two U-shaped steel beams, and installs bridge deck steel bars and concretes on the UHPC bottom die to form a reinforced concrete bridge deck, and the asphalt surface layer is paved on the reinforced concrete bridge deck, and the outer end of the upper part of the cantilever bridge deck of the reinforced concrete bridge deck is provided with an anti-collision guardrail, and the integrated structure mainly has the following advantages: the U-shaped steel beam and the UHPC bottom die are integrated in structure, deformation is coordinated, and structural stress is scientific and reasonable; compared with the traditional steel template and the template support, the splayed UHPC bottom die saves templates, does not need template support, saves energy, reduces emission, and is economical and environment-friendly; the calculation method of the UHPC bottom die integrated structure design is clear in principle, scientific, reasonable, practical and feasible, can guide the integrated construction of the steel-concrete composite beam panel and the UHPC bottom die, and improves the safety performance and engineering quality. Therefore, the integrated structure of the reinforced concrete composite beam panel and the UHPC bottom die has the advantages of simple structure, convenient construction, safety, reliability, energy conservation, environmental protection and high cost performance, and has higher economic and social benefits by combining the corresponding construction method.
Drawings
Fig. 1 is an elevational schematic of the present utility model.
Fig. 2 is a schematic diagram of a three-dimensional front structure of a bottom die of a UHPC.
Fig. 3 is a schematic diagram of the three-dimensional back surface structure of the bottom die of the UHPC.
Fig. 4 is an I-I cross-sectional view of fig. 2.
Fig. 5 is a sectional view of fig. 2 at II-II.
Fig. 6 is a sectional view of fig. 2 at III-III.
Fig. 7 is a force calculation diagram of the UHPC bottom die.
Description of the embodiments
Embodiments of the present utility model will be described in detail below with reference to the drawings.
As shown in FIGS. 1-7, 1.U steel beams, 2 upper flange plates, 3 shear keys, 4.UHPC bottom molds, 41 plane plates, 42 inclined plates, 43 rib plates, 44 ends, 5 reinforced concrete decks, 51 cantilever decks, 6 asphalt layers and 7 crash barriers.
The integrated structure of the steel-concrete composite beam panel and the UHPC bottom die is shown in fig. 1, and relates to the field of bridge energy-saving construction, the structure comprises a plurality of U-shaped steel beams 1 arranged on a support of a bridge pier, steel top plates with certain width and the same length as the U-shaped steel beams are welded at the tops of two sides of each U-shaped steel beam, a plurality of shear keys 3 are welded on each steel top plate, UHPC bottom dies 4 are arranged between the tops of each U-shaped steel beam 1 and the steel top plates of every two adjacent U-shaped steel beams, bridge deck steel bars and pouring concrete are arranged on the UHPC bottom dies to form a reinforced concrete bridge deck 5, finally, the integrated structure of the steel-concrete composite beam panel and the UHPC bottom dies is formed, an asphalt surface layer 6 is paved on the reinforced concrete bridge deck 5, and an anti-collision guardrail 7 is arranged at the outer end of the upper part of a cantilever 51 of the reinforced concrete bridge deck.
The U-shaped steel beam 1 is a steel-concrete combined beam groove-shaped steel girder, and the steel-concrete combined beam groove-shaped steel girder is manufactured by U-shaped sections by steel plates in a steel structure manufacturing factory, transported to a construction site for assembly and hoisted to a support of a bridge pier; the steel roof is welded at the top of the U-shaped steel beam 1, can bear shearing force and bending moment, strengthen the connection effect of the U-shaped steel beam and the reinforced concrete bridge deck, and achieve the purpose of common stress.
The UHPC bottom die 4 is a splayed folded plate made of ultra-high strength and high durability materials, the splayed folded plate comprises a plane plate 41, inclined plates 42 respectively positioned at two ends of the plane plate and a plurality of rib plates 43 arranged on the bottom surface of the plate, the width of each UHPC bottom die 4 is 80 cm-100 cm, and the length is matched with the width of the top of each U-shaped steel beam 1 and the distance between two adjacent U-shaped steel beams; the plate end of the inclined plate 42 is a flat-bottom trapezoid end 44, two ends of the end 44 are respectively placed at one side edge of a steel top plate at the top of the U-shaped steel beam 1, and two end edges of the end 44 are tightly attached to adjacent shear keys 3 to prevent the UHPC bottom die 4 from sliding.
The thickness of the plane plate 41, the inclined plate 42 and the rib plates 43 is 1.5 cm-3 cm, and the lengths of the plane plate 41, the inclined plate 42, the number of the rib plates 43 and the height are all determined by the top width and the beam spacing of the U-shaped steel beams 1 in the reinforced concrete composite beam.
The UHPC bottom die 4 is arranged and closely mounted on the girder of the reinforced concrete composite girder in longitudinal sequence, and adjacent plates are bonded by building glue so as not to leak cement slurry when the reinforced concrete bridge deck is poured.
The UHPC is an ultrahigh-strength cement-based material with high strength, high toughness and low porosity, and the fineness and activity of the mixture components are improved, coarse aggregate is not used, and defects such as pores and microcracks in the material are minimized, so that the ultrahigh strength and high durability are obtained.
The shear key 3 is a round head welding nail welded on the upper flange plate 2 of the steel girder, and is arranged in a clustered mode, and the distance is 15 cm-30 cm.
The reinforced concrete bridge deck 5 is of a reinforced concrete structure, and reinforced bars are arranged on the UHPC bottom die 4 and cement concrete is poured, so that a plurality of U-shaped steel beams 1 are connected together to form a reinforced concrete composite beam structure.
The cantilever bridge deck 51 is a reinforced concrete suspension bridge deck at two outermost sides of the U-shaped steel beam 1, a template of the cantilever bridge deck is a UHPC bottom die 4, a traditional steel template or a traditional wood template can be used, and an ear plate, a bracket and an installation template are welded at the outer side of a web plate of the U-shaped steel beam.
The asphalt surface layer 6 is asphalt concrete and paved on the top surface of the reinforced concrete bridge deck 5.
The anti-collision guardrail 7 is of a reinforced concrete structure, is arranged at the outer end of the upper part of the cantilever bridge deck 51, and is a bridge operation safety protection facility.
The least adverse stress working condition of the UHPC bottom die 4 is the construction stage of the reinforced concrete bridge deck 5, the construction load is the weight of the reinforced concrete bridge deck, and the sum of the construction machine and the mechanical vibration force isThe following calculation formula is obtained by the elasticity theory:
formula I, UHPC bottom die moment of inertia
The curved sections of the plane plate CD section and the inclined plate AC section and the inclined plate DB section of the UHPC bottom die 4 are T-shaped, and the height from the top surface of the plane plate 41 to the rib plate bottom isArbitrary->From the inclined plane 42 toThe height of the rib bottom is +.>Since the cross-sectional area of the plurality of ribs 43 is small, it is assumed that the centroid position of the cross-section is located at the thickness of the flat plate and the inclined plate +>In the inner part, the heights from the bottoms of the plane plate 41, the inclined plate 42 and the rib plate 43 to the cross section centroid are respectively +.>、/>The bending moment of inertia is:
1. planar plate CD segment
In the middle of
2. Diagonal panel AC section, DB section
In the middle of
Formula II, UHPC bottom die stress
The UHPC bottom die 4 is a double-hinge arch which is placed on a steel top plate, and the sum of the vibration force of the reinforced concrete bridge deck 5, the construction machine and the mechanical vibration force isUnder the action of->As symmetry axis, the horizontal force of the arch springing and the UHPC bottom die force are calculated as follows:
1. horizontal force of folding arch foot
In the middle of
2. UHPC bottom die internal force
Arch folding axial force:
bending moment of the arch:
the fixed integral in the formula is obtained by numerical calculation;
formula III, UHPC bottom die strength checking calculation
Each symbol in the first, second and third formulas is defined as:
-width of UHPC bottom mould, +.>；
-the diagonal length of the diagonal plate 42 of the UHPC bottom mould 4, the horizontal length of the half-plane plate 41, the horizontal total length of the UHPC bottom mould 4, +.>；
-thickness of plane plate 41 and inclined plate 42, thickness of rib 43, respectively, +.>；
-the left end of the UHPC bottom die 4 is the horizontal and vertical scale of the origin,/->；
-inclined panels 42 of UHPC bottom mould, respectively +.>Vertical height from top of the panel to bottom of the rib, height of the flat panel 41 and rib 43, total height from top of the flat panel to bottom of the rib, +.>；
-number of ribs 43;
-inclined plate 42 of UHPC bottom mould 4 and +.>Included angle of shaft->；
Plane plate of UHPC bottom die 4The curved sections of the CD section, the inclined panel AC section and the DB section are T-shaped, and the centroid positions of the sections are assumed to be positioned at the thickness +.>In, the height from the centroid of the flat plate to the rib plate bottom is +>Arbitrary->The vertical height from the center of the inclined plate to the bottom of the rib plate is +>，/>；
-calculation coefficients of the positions of the centroids of the sections of the plane plate CD section and the inclined plate AC section, DB section of the UHPC bottom die 4 respectively, +.>、/>The unit is->，/>、/>The unit is->，/>、/>The unit is->；
-elastic modulus of UHPC bottom die 4, +.>；
The load of the reinforced concrete bridge deck 5 construction stage of the steel-concrete composite beam is the sum of the weight of the reinforced concrete bridge deck, the construction machinery and the mechanical vibration force, and is ∈>；
-diagonal panels of UHPC bottom mould 4, respectively->Moment of inertia of the center of the position to the centroid and moment of inertia of the plane plate to the centroid, +.>；
-diagonal panels of UHPC bottom mould 4, respectively->Cross-sectional area of the location, cross-sectional area of the planar plate, +.>；
UHPC bottom die 4 is loaded with ++under the simple support condition of force method>Moment distribution at the time>；
UHPC bottom die 4 virtual horizontal force in arch force method ++>Moment distribution at the time>；
UHPC bottom die 4 virtual horizontal force in arch force method ++>Axial force distribution during time,/->；
-UHPC bottom die 4 is loaded respectively +.>Moment distribution, maximum moment, < ->；
-UHPC bottom die 4 is loaded respectively +.>Axial force distribution at the moment, maximum axial force, < >>；
UHPC bottom die 4 is loaded with +.>Horizontal force of arch foot->；
-calculating the coefficients of the unwanted unknown forces by force method for the UHPC bottom die 4, respectively,/->；
-maximum tensile stress, allowable tensile stress, respectively, of the UHPC bottom die 4, +.>。
The construction method of the steel-concrete composite beam panel and UHPC bottom die integrated structure mainly comprises the following steps:
step one, the structural size of the UHPC bottom die is planned
1. According to the actual condition of the steel-concrete composite beam panel, the primary steel-concrete composite beam panel and the UHPC bottom die are integrated into a structure, the arrangement form and the engineering material are selected;
2. rechecking and determining the integral structure size, arrangement form and engineering material selection of the steel-concrete composite beam panel and the UHPC bottom die by using a formula I, a formula II and a formula III;
3. compiling construction organization design files and organizing construction;
step two, factory manufacturing, transportation and installation of U-shaped steel beams
1. The manufacturing unit carries out a welding process assessment test according to the joint form of the steel beam and relevant specifications, and compiles a detailed welding process assessment report; determining proper welding groove size, welding parameters and welding process through experiments, and formulating effective measures for controlling welding deformation and reducing welding residual stress so as to ensure the welding quality and the safety of the structure; on the premise of ensuring the welding quality, a welding process with small welding deformation and small welding seam shrinkage should be selected as much as possible;
2. in order to ensure the installation precision of the steel beam, the manufacturing unit should carry out integral trial assembly on all the steel beam sections in a factory, and the manufacturing unit should effectively manage the trial assembly errors so as to avoid error accumulation; the quality of the upper flange plate and the shear key meet the design requirement;
3. in order to ensure that the components are transported without errors, the manufacturing units are required to number the component type identification components, and the identification should be obvious and durable; in order to ensure the smooth welding connection between the steel beam sections, the manufacturing unit should take practical measures to prevent the deformation of the components in the storage and transportation processes of the steel beam components; during the storage and transportation of the components, the protection of the coating surface of the steel structure should be paid attention to, and if the damage exists, the repair should be carried out in time; the manufacturing unit should make a coating surface repair process and report design and supervision approval;
4. the deviation of adjacent beams Duan Jiefeng should be reduced in the assembly process, and the assembly stagger in the longitudinal, transverse and height directions meets the standard; the plane precision and the elevation of the steel beam during installation should be strictly controlled when the steel beam is installed, and the allowable deviation between the steel beam and the theoretical position accords with the standard;
step three, prefabricating UHPC bottom die components
1. The ready-mixed mixture of cement, mineral admixture, fine aggregate and functional additive for preparing UHPC ultra-high performance concrete should be stored in places which are dry, ventilated, dampproof and not exposed to rain, should be respectively piled according to varieties and batch numbers, should not be piled and mixed for use, and should be stored before use; when the intervention mix is suspected or wet or stored for more than 3 months, resampling and rechecking are needed, and only if the rechecking is qualified, the mixture can be used;
2. the steel fiber is selected from steel fibers meeting the current industry standard, and the fibers are respectively marked and stored according to varieties, specifications and manufacturers and are dampproof and rust-proof;
3. the index requirement of the additive meets the specification, and the detection method is specified according to the national standard; the liquid additive should be stored in a closed container, should be sun-proof and antifreezing, if there is abnormal phenomenon of precipitation, should be used after the inspection is qualified;
4. determining the mixing ratio of UHPC through experiments; UHPC mixing is preferably carried out by adopting a vertical shaft planetary forced mixer, and stirring is carried out in a factory or on site; the total dry material volume is about twice the volume of the finished product after the stirring is completed; the volume of each stirring is generally about half of the volume of the stirring tank, and the maximum volume of the stirring tank is not more than 2/3 of the geometric volume of the stirring tank; feeding sequence: starting a stirrer, adding powder, stirring for 60s, adding water and additives, stirring for 240s, adding fibers, continuously stirring for 180s, and discharging; discharging after the concrete is uniformly stirred, wherein the phenomenon of agglomeration of powder and fiber does not occur in the mixture; after the stirring is completed, any water or additive is not added into the mixture; by experiments, a proper amount of expanding agent is doped into cast-in-situ UHPC;
5. UHPC mixture transportation equipment or facilities should be cleaned before receiving materials and no accumulated water exists, when the UHPC mixture transportation equipment or facilities are transported by adopting a stirring transport vehicle, the transportation time is not longer than 90 minutes, and segregation and bleeding phenomena of concrete do not occur when the UHPC mixture transportation equipment or facilities are transported to the site; if the suspended hopper type other simple modes are adopted for transportation, the transportation time is not longer than 30min, and any water is not added into the mixture in the transportation process;
6. the UHPC template must reach the due strength and rigidity, and can withstand the impact, vibration and personnel load when UHPC is poured; the UHPC has strong fluidity, the pressure of the template is higher than that of ordinary concrete, and the template is required to be sealed without expanding the template and leaking slurry; the surface of the template contacted with the UHPC is provided with water permeable template cloth; the compressive strength of the concrete is not lower than 10.0MPa, and the side mold can be removed; the bearing template can be dismantled when the concrete strength can bear the dead weight load and other possible superposition load and reach more than 60 MPa; the detached template should be checked in time to clean the surface of the template; the surface of the template is prevented from being collided and knocked by heavy objects, and sharp hard objects are forbidden to scratch the surface of the template;
7. checking the size of a template before pouring UHPC mixture, and pouring after confirming no errors; the plug-in vibrating rod is not needed for vibrating during normal pouring, but the plug-in vibrating rod can be used for properly vibrating when meeting the narrow space, so that the compactness of the concrete is ensured; the concrete is required to be uniformly distributed during in-situ casting, and casting is required to be continuously carried out; after the UHPC mixture is poured, repairing and trowelling the exposed surface of the concrete in time; during the concrete pouring, a field technician observes the stability of the template at a moment, and when loosening, deformation and displacement are found, the top surface of the concrete should be napped or other roughness-increasing treatment measures should be taken after the pouring is finished in time;
8. in the UHPC mixture pouring process, plastering, polishing, watering, laminating and curing are carried out while pouring; at least covering a membrane and maintaining geotextile for 7 days after construction, and reinforcing inspection during the maintenance period to ensure that maintenance is in place; when the on-site air temperature is higher than 35 ℃, the midday construction is avoided, and the construction can be selected in the morning, evening or night; if the concrete cannot be avoided, the concrete covered with the moisturizing and health preserving film after being formed should be sprayed with water for moisturizing and health preserving in time; when the construction air temperature is lower than 5 ℃, construction is not suitable, if construction is needed, construction process tests are carried out by a construction party and a material supplier, and heat preservation measures are determined;
9. removing the die after the UHPC bottom die component meets the requirement of specified strength, cleaning residual concrete at corners, orderly stacking, and transporting to a construction site in time;
step four, UHPC bottom die installation
1. Installing a UHPC bottom die 4 along the bridge direction of the U-shaped steel beam 1; transversely installing the U-shaped steel beams from the middle roof truss gradually and symmetrically towards two sides;
2. the two ends of the UHPC bottom die are tightly attached to the adjacent shear keys 3, so that the UHPC bottom die is prevented from sliding, if gaps exist, a thin steel plate is used for plugging the gaps and electric welding is firm;
3. the UHPC bottom module pieces are longitudinally and sequentially arranged and are tightly attached, and adjacent plates are bonded by building glue so as not to leak cement slurry when the reinforced concrete bridge deck is poured;
4. the cantilever bridge deck 51 is formed by taking a part of UHPC bottom die 4 or using a traditional steel template and a traditional wood template, and then welding an ear plate, a bracket and a mounting template on the outer side of a web plate of the U-shaped steel beam 1;
step five, installing steel bars of the reinforced concrete bridge deck and pouring cement concrete
1. Installing bridge deck steel bars on the UHPC bottom die 4, and placing protective layer blocks between the bridge deck steel bars and the UHPC bottom die to enable the total protective layer thickness of the steel-concrete composite beam panel and the UHPC bottom die integrated structure to meet the standard or design requirement;
2. pouring reinforced concrete bridge face cement concrete, and oscillating for compaction;
3. paving geotextile after final setting of cement concrete, and sprinkling water for curing to the specified strength;
step six, construction of anti-collision guardrail and asphalt surface layer
1. Dismantling a cantilever bridge deck template or a support bracket;
2. erecting a crash barrier template, installing crash barrier steel bars, and welding the crash barrier steel bars and reinforced concrete bridge surface embedded bars;
3. pouring cement concrete of the anti-collision guardrail, removing the template of the anti-collision guardrail after the cement concrete reaches a certain strength, paving geotextile, and sprinkling water for maintenance until the strength reaches a specified strength;
4. cleaning sundries on the surface of the reinforced concrete bridge surface cement concrete, blasting balls, roughening the reinforced concrete bridge surface, and spreading an adhesive layer;
5. paving bridge deck asphalt concrete, and compacting by rolling.
The foregoing is merely a specific embodiment of the present utility model, and it should be understood by those skilled in the art that any structural design equivalent to the embodiment is included in the scope of the present utility model.
Claims (9)
1. The utility model provides a steel and concrete composite beam panel and UHPC die block integrated structure, includes to install many pin U shaped steel roof beam (1) on the support of bridge pier, its characterized in that every pin U shaped steel roof beam's both sides top all weld a certain width, and with the steel roof of the same length of U shaped steel roof beam, all weld many shear force keys (3) on every steel roof, then all install UHPC die block (4) between the top of every pin U shaped steel roof beam and the steel roof of every adjacent two pin U shaped steel roof beams to install bridge floor reinforcing bar and concreting on the UHPC die block and form reinforced concrete bridge floor (5), spread asphalt pavement layer (6) on this reinforced concrete bridge floor, cantilever bridge floor upper portion outer end of reinforced concrete bridge floor is equipped with anticollision barrier (7).
2. The steel-concrete composite beam panel and UHPC bottom die integrated structure according to claim 1, wherein the UHPC bottom die (4) is a splayed folded plate made of ultra-high strength and high durability materials, the splayed folded plate comprises a plane plate (41), inclined panels (42) respectively positioned at two ends of the plane plate and a plurality of rib plates (43) arranged on the bottom surface of the plate, the width of each UHPC bottom die (4) is 80 cm-100 cm, and the length of each UHPC bottom die is matched with the width of the top of each U-shaped steel beam (1) and the distance between two adjacent U-shaped steel beams; the plate end of the inclined plate (42) is a flat-bottom trapezoid, two ends of the end (44) are respectively placed at one side edge of a steel top plate at the top of the U-shaped steel beam (1), and two end edges of the end (44) are tightly attached to adjacent shear keys (3) to prevent the UHPC bottom die (4) from sliding.
3. The steel-concrete composite beam panel and UHPC bottom die integrated structure according to claim 1, wherein the U-shaped steel beam (1) is a steel-concrete composite beam groove-shaped steel girder, and the steel-concrete composite beam groove-shaped steel girder is manufactured by U-shaped sections of steel plates in a steel structure manufacturing factory, transported to a construction site for assembly and hoisted to a support of a bridge pier; the steel top plate is welded at the top of the U-shaped steel beam (1) and bears shearing force and bending moment.
4. The steel-concrete composite beam panel and UHPC bottom die integrated structure according to claim 2, wherein the thicknesses of the plane plate (41), the inclined plate (42) and the rib plates (43) are 1.5 cm-3 cm, and the lengths of the plane plate (41), the inclined plate (42), the number and the heights of the rib plates (43) are determined by the top surface width and the beam spacing of the U-shaped steel beams (1) in the steel-concrete composite beam.
5. The integrated structure of the reinforced concrete composite beam panel and the UHPC bottom die according to claim 1, wherein the UHPC bottom die (4) is arranged in sequence and is closely mounted on the girder of the reinforced concrete composite beam in the longitudinal direction, and adjacent plates are bonded by building glue so as not to leak cement slurry when pouring the reinforced concrete bridge deck.
6. The steel-concrete composite beam panel and UHPC bottom die integrated structure according to claim 1, wherein the shear key (3) is a round head welding nail welded on an upper flange plate (2) of a steel main beam, and is arranged in a clustered mode, and the distance is 15 cm-30 cm.
7. The steel-concrete composite beam panel and UHPC bottom die integrated structure according to claim 1, wherein the reinforced concrete bridge deck (5) is a reinforced concrete structure, and bridge deck steel bars and pouring concrete are installed on the UHPC bottom die (4) so that a plurality of U-shaped steel beams (1) are connected together to form the steel-concrete composite beam structure.
8. The steel-concrete composite beam panel and UHPC bottom die integrated structure according to claim 1, wherein the cantilever bridge deck (51) is a reinforced concrete suspension bridge deck at two outermost sides of the U-shaped steel beam (1), a part of the UHPC bottom die (4) is taken as a template or a traditional steel template and a traditional wood template are used, and an ear plate, a bracket and a mounting template are welded at the outer side of a web plate of the U-shaped steel beam (1).
9. The steel-concrete composite beam panel and UHPC bottom die integrated structure according to claim 1, wherein the asphalt surface layer (6) is asphalt concrete and is a paving layer paved on the top surface of the reinforced concrete bridge deck (5); the anti-collision guardrail (7) is of a reinforced concrete structure, is arranged at the outer end of the upper part of the cantilever bridge deck (51), and is a bridge operation safety protection facility.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322170599.0U CN220665969U (en) | 2023-08-14 | 2023-08-14 | Steel-concrete composite beam panel and UHPC bottom die integrated structure |
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| CN202322170599.0U CN220665969U (en) | 2023-08-14 | 2023-08-14 | Steel-concrete composite beam panel and UHPC bottom die integrated structure |
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