CN114589805A - Prefabricated reinforced concrete rectangular bridge deck prefabricating method - Google Patents
Prefabricated reinforced concrete rectangular bridge deck prefabricating method Download PDFInfo
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- CN114589805A CN114589805A CN202210275716.7A CN202210275716A CN114589805A CN 114589805 A CN114589805 A CN 114589805A CN 202210275716 A CN202210275716 A CN 202210275716A CN 114589805 A CN114589805 A CN 114589805A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
- B28B23/022—Means for inserting reinforcing members into the mould or for supporting them in the mould
- B28B23/024—Supporting means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/0002—Auxiliary parts or elements of the mould
- B28B7/0011—Mould seals
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/0029—Moulds or moulding surfaces not covered by B28B7/0058 - B28B7/36 and B28B7/40 - B28B7/465, e.g. moulds assembled from several parts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/0029—Moulds or moulding surfaces not covered by B28B7/0058 - B28B7/36 and B28B7/40 - B28B7/465, e.g. moulds assembled from several parts
- B28B7/0055—Mould pallets; Mould panels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/0064—Moulds characterised by special surfaces for producing a desired surface of a moulded article, e.g. profiled or polished moulding surfaces
- B28B7/0082—Moulds characterised by special surfaces for producing a desired surface of a moulded article, e.g. profiled or polished moulding surfaces with surfaces for moulding parallel grooves or ribs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/34—Moulds, cores, or mandrels of special material, e.g. destructible materials
Abstract
The invention discloses a method for prefabricating a rectangular prefabricated reinforced concrete bridge deck for a steel-concrete composite beam, which is characterized in that the position relationship among the position of the bridge deck extending out of a steel bar, the position of a steel bar joint during the assembly of the bridge deck and the position of a steel beam shear nail is simulated, verified and adjusted by using a BIM (building information modeling) technology, so that the position conflict among the bridge deck, the steel bar joint and the steel beam shear nail during the assembly is avoided; the initial positions of the reinforcing steel bars are set by adopting a turning and abdicating method, when in hoisting, the adjacent bridge deck plates are placed according to preset positions after turning around, and the adjacent lap-jointed reinforcing steel bars can automatically stagger the lap-jointed positions, so that the position conflict of the bridge deck plate reinforcing steel bars at the lap-jointed positions during assembly is avoided; a thick steel plate is used as a bottom die, so that the bridge deck is prevented from warping; the combination of the inverted inserting side forms ensures that the edges and corners of the bridge deck are clear and the line shape is smooth, and solves the problems that the opening of the side form is upward, more slurry leaks and the upper edge of concrete is difficult to form in the prior art; the invention greatly improves the prefabrication precision and the appearance quality of the bridge deck by the comprehensive application of the technologies.
Description
Technical Field
The invention relates to the field of bridge construction, in particular to a method for prefabricating an assembly type reinforced concrete rectangular bridge deck commonly used for a steel-concrete composite beam.
Background
The steel-concrete composite beam is widely applied to bridge construction, the structure of the steel-concrete composite beam is mostly formed by assembling and laminating a frame-shaped steel beam and a reinforced concrete rectangular bridge deck on site, and the laminated part is formed by connecting the superposed part of the extended steel bars of the bridge deck and shear nails on the steel beam into a whole through cast-in-place concrete. The steel beam is precisely manufactured in a fixed workshop through modern equipment, the reinforced concrete bridge deck is prefabricated on site half a year in advance, the precision of the steel beam and the reinforced concrete bridge deck is far away, the problems of warping, slab staggering, position conflict of steel bar lap joint and position conflict of steel bar joints and steel beam shear nails are easily caused during assembly, the construction quality is influenced, and difficulty is brought to the assembly progress. The common prefabrication method is that the notch of the side mold faces upwards, and the notch is arranged according to the position of a steel bar; because the reinforcing steel bars are generally uniformly arranged according to the whole, the starting and ending points of the reinforcing steel bars of each plate are different in position and the side molds are not shared well during blocking, and errors are easy to occur; in addition, the notches at the upper ends of the side molds cannot be plugged, so that slurry leakage and gaps are easily generated during concrete pouring, the quality is influenced, and the appearance linearity cannot be guaranteed, so that how to improve the prefabrication precision and the appearance quality of the reinforced concrete bridge deck is an important subject in front of engineering technicians.
Disclosure of Invention
The invention aims to provide a prefabricated method of a rectangular bridge deck of prefabricated reinforced concrete, which can improve the assembly efficiency, reduce the investment and classified storage of side molds, avoid the position conflict of reinforcing steel bars of the bridge deck at the lap joint and the warping phenomenon of the bridge deck during assembly, achieve the visual effects of clear edges and corners and smooth line shape, and has high bridge deck prefabrication precision and appearance quality.
The purpose of the invention is realized as follows:
a prefabricated method of an assembled reinforced concrete rectangular bridge deck comprises the following specific steps:
A. installing embedded angle steel and embedded anchor bars at preset positions, pouring a concrete base, and paving a bottom die steel plate on the concrete base, so that the bridge deck can be prevented from warping;
B. the position relation among the position of the bridge deck extending out of the steel bars, the position of the steel bar joint when the bridge deck is assembled and the position of the steel beam shear nail is simulated, verified and adjusted by using a BIM (building information model) technology, so that the position conflict among the bridge deck, the steel bar joint and the steel beam shear nail is avoided when the bridge deck is assembled;
C. a steel bar arrangement formula: l1= i +2A + m a + j, L2= i +2B + n B + j, wherein i =3.6cm, j =6.4cm, L1 is the length of the bridge deck; l2 is the width of the deck slab; l0 and L3 are lengths of the bridge deck extending out of the steel bars; m is the number of the steel bars of the long side L1; n is the number of the grades of the steel bars of the short side L2; a is the steel bar spacing of the long side L1; b is the steel bar spacing of the short side L2; a is the steel bar adjusting distance of the long side L1; b is the steel bar adjusting distance of the short side L2; the steel bars are arranged according to the formula and are bound and welded on the jig frame, and the starting and ending positions of the steel bars are set by adopting a turning and abdicating method;
D. firstly, polishing a bottom die steel plate, lofting according to the designed length and width dimensions of a bridge deck, and flatly paving and fixing the inner side of a base plate on the bottom die steel plate along the periphery according to the lofting dimensions by using a head-to-tail connection method;
E. integrally hoisting reinforcing steel bars of the bridge deck, putting the reinforcing steel bars on a base plate, installing side molds by an inverted insertion method, wherein the side molds form a rectangle and are fixed on the base plate, the side molds are flush with the inner side of the base plate, and the flange joints are all screwed by bolts;
F. the plugging device is made by nailing a bamboo rubber plate and square wood, the plugging device is placed between two layers of bridge deck extending reinforcing steel bars outside the side mold, the bamboo rubber plate is tightly attached to the side mold and used for plugging slurry leakage of a notch of the side mold, the square wood is tightly propped by the vertical limiting reinforcing steel bars, and the vertical limiting reinforcing steel bars are welded on the bridge deck extending reinforcing steel bars;
G. pouring concrete in a rectangular area enclosed by the side molds, dismantling the side molds, roughening the contact surfaces of the concrete and the side molds, maintaining for seven days, and then lifting and storing.
In the step A, the thickness of the bottom die steel plate is not less than 8mm, the flatness is less than 2mm, and the sizes of the bottom die steel plate in the length and width directions are respectively 400mm larger than the sizes of the bridge deck in the length and width directions.
In the step D, the distance of the inner side of the backing plate is respectively the same as the size of the bridge deck in the length and width directions, the backing plate is a rectangular steel plate, the width of the backing plate is 100mm, and the length of the backing plate extends out 150mm from one side of the end-to-end joint, namely: the length of the backing plate is 150mm longer than the length and width direction of the bridge deck plate, and the thickness of the backing plate is equal to the thickness of the lower edge protection layer of the bridge deck plate extending out of the reinforcing steel bars.
In the step E, the side mold consists of a side mold panel, a transverse rib and a flange; the side formwork panel is made of a steel plate with the thickness of 14mm, the height of the steel plate is equal to the height of the bridge formwork panel and the thickness of the cushion plate, the side formwork panel is provided with a single-side notch according to the distance between the bridge formwork panel and the steel bar, the notch faces downwards, the width of the notch is 3mm larger than the diameter of the bridge formwork panel extending out of the steel bar, and the depth of the notch is equal to the height of the bridge formwork panel and the total thickness of the upper and lower edge protection layers of the steel bar; the transverse ribs are made of No. 8 channel steel, the channel steel is horizontally placed, an opening of the channel steel faces downwards, and the channel steel is welded on the outer side of the top surface of the side die panel; the flange is made of rectangular steel plates, the width of the flange is 80mm, the thickness of the flange is 10mm, the height of the flange is equal to that of the side die, and two M12 bolt holes are distributed.
In the step F, the length of the bamboo plywood is the same as that of the side die, the thickness of the bamboo plywood is 12mm, the height of the bamboo plywood is equal to the net distance between the two layers of bridge deck slab extending steel bars, and the cross section size of the square timber is 100 x 100 mm.
Or:
in the step D, the backing plate is a toothed steel plate, the distance of the inner side of the backing plate is respectively the same as the length and width dimensions of the bridge deck plate, the width of the backing plate without tooth height is 100mm, the length of the edge with teeth is equal to the length L1 of the bridge deck plate, the length of the straight line edge is equal to the width L2 plus 300mm of the bridge deck plate, and the thickness of the backing plate is equal to the thickness of the lower edge protection layer of the bridge deck plate extending out of the reinforcing steel bar.
In the step E, the side mold consists of a side mold panel, a transverse rib and a flange; the side die panel is bent into a tooth shape by adopting a 14mm thick steel plate according to the pattern of the bridge panel, the height is equal to the height of the bridge panel and the thickness of the cushion plate, the side die panel is provided with a single-side notch according to the distance between the bridge panel and the extending steel bar, the notch faces downwards, the width of the notch is 3mm larger than the diameter of the bridge panel extending the steel bar, and the depth of the notch is equal to the height of the bridge panel and the total thickness of the upper and lower edge protection layers of the steel bar; the transverse rib is made into a tooth shape according to the size by using No. 8 channel steel, the channel steel is horizontally placed, an opening of the channel steel faces downwards, and the channel steel is welded on the outer side of the top surface of the side die panel; the flange is made of rectangular steel plates, the width of the flange is 80mm, the thickness of the flange is 10mm, the height of the flange is equal to that of the side die, and two M12 bolt holes are distributed.
In the step F, the length of the bamboo plywood is the same as that of the tooth-shaped side die, the thickness of the bamboo plywood is 12mm, the height of the bamboo plywood is equal to the net distance between the two layers of bridge deck slab extending steel bars, the cross section size of the square timber is 100-100 mm, and the bamboo plywood is made into a tooth shape according to the size.
The invention has the following advantages:
1. through the application of the BIM (building information model) technology, the position conflict among the position of the bridge deck extending out of the steel bar, the position of the steel bar joint when the bridge deck is assembled and the position of the steel beam shear nail is thoroughly eliminated, and the method is very effective for improving the assembly efficiency;
2. the starting and end positions of the reinforcing steel bars are set by adopting a turning and abdicating method, when in hoisting, the adjacent bridge deck plates are placed according to preset positions after turning around, the overlapped reinforcing steel bars of the adjacent overlapped parts can automatically stagger the overlapped positions, and adjacent plates are not required to be additionally made, so that the investment and classified storage of the side molds are reduced, the assembly efficiency is improved, and the position conflict of the reinforcing steel bars of the bridge deck plates at the overlapped positions during assembly is avoided;
3. a thick steel plate is used as a bottom die, so that the bridge deck is prevented from warping;
4. the side forms are installed by an inverted insertion method, so that the edges and corners of the bridge deck are clear, the line shape is smooth, and the construction problems that the opening of the side form is upward, the slurry leakage of the notch is more, and the upper edge line of concrete is not easy to form in the prior art are thoroughly solved;
5. by comprehensively applying the technologies, the prefabrication precision and the appearance quality of the bridge deck are greatly improved.
Drawings
FIG. 1 is a schematic structural view of example 1;
FIG. 2 is a layout view of a mat according to example 1;
FIG. 3 is a schematic structural view of example 2;
FIG. 4 is a layout view of a backing plate of example 2;
FIG. 5 is a side elevational view;
FIG. 6 is a cross-sectional view of a sideform;
FIG. 7 is a side view in plan;
FIG. 8 is an assembled view of the bottom mold and the side mold;
in the figure: 1. side mould; 11. a side form panel; 2. a base plate; 21. a concrete base; 22. a bottom die steel plate; 23. embedding angle steel in advance; 24. embedding anchor bars; 3. a cross rib; 4. a flange; 5. bolt holes; 6. a bolt; 7. square wood; 8. limiting the reinforcing steel bars; 9. the bridge deck extends out of the steel bars; 10. bamboo plywood; m1, rectangular bridge deck; m2, castellated bridge deck.
Detailed Description
The invention is described in further detail below with reference to the following examples and figures.
Example 1:
a prefabricated method of an assembly type reinforced concrete rectangular bridge deck is shown in figure 1 and comprises the following specific steps:
A. installing embedded angle steels 23 and embedded anchor bars 24 at preset positions, pouring a concrete base 21, and paving bottom die steel plates 22 on the concrete base 21 to avoid warping of the bridge deck;
B. the position relation among the position of the bridge deck extending out of the steel bar 9, the position of a steel bar joint when the bridge deck is assembled and the position of a steel beam shear nail is simulated, verified and adjusted by using a BIM (building information model) technology, so that the position conflict among the bridge deck M1 during assembly is avoided;
C. the formula of the arrangement of the steel bars is shown in figure 1: l1= i +2A + M a + j, L2= i +2B + n B + j, wherein i =3.6cm, j =6.4cm, L1 is the length of the bridge deck M1; l2 is the width of deck plate M1; l0 and L3 are the lengths of the bridge deck extending out of the steel bars 9; m is the number of grades of the reinforcing steel bars of the long side L1; n is the number of the grades of the steel bars of the short side L2; a is the steel bar spacing of the long side L1; b is the steel bar spacing of the short side L2; a is the steel bar adjusting distance of the long side L1; b is the steel bar adjusting distance of the short side L2; the reinforcing steel bars are arranged according to the formula and are bound and spliced into a whole on the jig frame, the starting and ending positions of the reinforcing steel bars are set by adopting a turning and abdicating method, and when the reinforcing steel bars are assembled, the automatic abdicating and smooth lapping of the reinforcing steel bars can be realized only by turning and placing the adjacent bridge deck plates M1, so that the position conflict of the bridge deck plates extending out of the reinforcing steel bars 9 at joints is avoided, and the investment of the side mold 1 is reduced;
D. firstly, polishing the bottom die steel plate 22, lofting according to the designed length and width dimensions of the bridge deck plate M1, and flatly paving and fixing the inner side of the base plate 2 on the bottom die steel plate 22 along the periphery according to the lofting dimensions by using an end-to-end connection method shown in FIG. 2;
E. integrally hoisting the steel bars of the bridge deck M1 and placing the steel bars on the backing plate 2, installing the side dies 1 by an inverted insertion method according to the figure 8, wherein the side dies 1 are enclosed into a rectangle and fixed on the backing plate 2, and the side dies 1 are flush with the inner side of the backing plate 2; the flange joints are all screwed by bolts 6, so that the bridge deck M1 has accurate size, clear edges and corners, smooth line shape, high efficiency and leakage prevention;
F. the plugging device is formed by nailing a bamboo rubber plate 10 and square bars 7, two layers of bridge deck plates placed outside the side die 1 extend out of the reinforcing steel bars 9, the left end of the bamboo rubber plate 10 is tightly attached to the side die plate 11 and used for plugging slurry leakage of a notch of the side die plate 11, the square bars 7 are tightly propped by vertical limiting reinforcing steel bars 8, and the vertical limiting reinforcing steel bars 8 are welded on the extending reinforcing steel bars 9 of the bridge deck plates;
G. pouring concrete in the area enclosed by the side moulds 1, dismantling the side moulds 1, roughening the contact surfaces of the concrete and the side mould face plates 11, maintaining for seven days, and then lifting and storing.
In the step a, the thickness of the bottom die steel plate 22 is not less than 8mm, the flatness is less than 2mm, and the dimensions of the bottom die steel plate 22 in the length and width directions are respectively 400mm larger than the dimensions of the bridge deck M1 in the length and width directions.
In step D, the distance of backing plate 2 inboard is the same with the length width direction's of decking M1 size respectively, and backing plate 2 is the rectangle steel sheet, and the width of backing plate 2 is 100mm, and the length of backing plate 2 is 150mm in end to end department unilateral extension, promptly: the length of the backing plate is 150mm longer than the length and width directions of the bridge deck M1, and the thickness of the backing plate 2 is equal to the thickness of a protective layer of the bridge deck extending out of the lower edge of the steel bar 9.
In the step E, the side die 1 consists of a side die panel 11, a transverse rib 3 and a flange 4; the side die plate 11 is made of a steel plate with the thickness of 14mm, the height of the side die plate is equal to that of the bridge deck M1, the thickness of the backing plate 2 is reduced, a single-side notch is formed in the side die plate 11 according to the distance between the bridge deck and the extending reinforcing steel bar 9, the notch faces downwards, the width of the notch is 3mm larger than the diameter of the bridge deck extending the extending reinforcing steel bar 9, and the depth of the notch is equal to that of the bridge deck M1, and the total thickness of the upper and lower edge protection layers of the reinforcing steel bar is reduced; the transverse rib 3 is made of 8# channel steel, the channel steel is horizontally placed, the opening of the channel steel faces downwards, and the channel steel is welded on the outer side of the top surface of the side die panel 11; the flange 4 is made of rectangular steel plates, the width of the flange is 80mm, the thickness of the flange is 10mm, the height of the flange is equal to the height of the side die 1, and two M12 bolt holes 5 are arranged.
In the step F, the length of the bamboo plywood 10 is the same as that of the side die, the thickness of the bamboo plywood 10 is 12mm, the height of the bamboo plywood 10 is equal to the net distance between two layers of bridge deck slab extending steel bars 9, and the cross section size of the square timber 7 is 100 x 100 mm.
Example 2:
a prefabricated method of an assembled reinforced concrete rectangular bridge deck is shown in figure 3 and comprises the following specific steps:
A. installing embedded angle steels 23 and embedded anchor bars 24 at preset positions, pouring a concrete base 25, and paving bottom die steel plates 22 on the concrete base 25;
B. the position relation among the position of the bridge deck extending out of the steel bars 9, the position of a steel bar joint when the bridge deck is assembled and the position of a steel beam shear nail is simulated, verified and adjusted by using a BIM (abbreviation of building information model) technology, so that the position conflict among the bridge deck, the steel bar joint and the steel beam shear nail is avoided when the bridge deck is assembled;
C. the formula of the arrangement of the steel bars is shown in figure 3: l1= i +2A + M a + j, L2= i +2B + n B + j, wherein i =3.6cm, j =6.4cm, L1 is the length of the bridge deck M2; l2 is the width of deck plate M2; l0 and L3 are the lengths of the deck slab extending beyond the rebar 9; m is the grade number of the reinforcing steel bars on the long side; n is the grade number of the short-side steel bars; a is the distance between the reinforcing steel bars on the long side; b is the steel bar spacing of the short side; a is the distance between the long-side steel bars; b is the adjustment interval of the short-edge steel bars; the reinforcing steel bars are arranged according to the formula and are bound and welded on the jig frame into a whole, and when the bridge deck is assembled, the automatic abdicating and smooth lapping of the reinforcing steel bars can be realized only by turning the adjacent bridge deck plates, so that the position conflict of the bridge deck plates extending out of the reinforcing steel bars 9 at joints is avoided, and the investment of the side mold 1 is reduced;
D. firstly, polishing the bottom die steel plate 22, lofting according to the designed length and width dimensions of the bridge deck plate M2, and flatly paving and fixing the inner side of the backing plate 2 on the bottom die steel plate 22 along the periphery according to the lofting dimensions by a parallel connection method shown in figure 4; the backing plate 2 is a toothed steel plate.
E. Integrally hoisting the steel bars of the bridge deck M2 and placing the steel bars on the backing plate 2, and installing the side die 1 by an inverted insertion method according to the figure 8, wherein the side die deck 11 is in a tooth shape; the side mold 1 is enclosed into a rectangle and fixed on the backing plate 2, and the side mold 1 is flush with the inner side of the backing plate 2; the flange joints are all screwed by bolts 6, so that the bridge deck M2 has accurate size, clear edges and corners, smooth line shape, high efficiency and leakage prevention;
F. the tooth-shaped plugging device is formed by nailing a bamboo rubber plate 10 and square bars 7, two layers of bridge deck plates arranged outside the side die 1 extend out of the reinforcing steel bars 9, the left end of the bamboo rubber plate 10 is tightly attached to the side die plate 11 and used for plugging slurry leakage of a notch of the side die plate 11, the square bars 7 are tightly propped by vertical limiting reinforcing steel bars 8, and the vertical limiting reinforcing steel bars 8 are welded on the extending reinforcing steel bars 9 of the bridge deck plates;
G. pouring concrete in the area enclosed by the side moulds 1, dismantling the side moulds 1, roughening the contact surfaces of the concrete and the side mould face plates 11, maintaining for seven days, and then lifting and storing.
In the step a, the thickness of the bottom die steel plate 22 is not less than 8mm, the flatness is less than 2mm, and the dimensions of the bottom die steel plate 22 in the length and width directions are respectively 400mm larger than the bridge deck plate M2.
In the step D, the backing plate 2 is a toothed steel plate, the distance between the inner sides of the backing plate 2 is respectively the same as the length and width of the bridge deck M2, the minimum width of the backing plate 2 is 100mm, the length of the toothed edge is the same as the length of the bridge deck M2, the length of the straight line edge is equal to the width of the bridge deck M2 plus 300mm, and the thickness of the backing plate 2 is equal to the thickness of the lower edge protection layer of the bridge deck extending out of the steel bar 9.
In the step E, the side die 1 consists of a side die panel 11, a transverse rib 3 and a flange 4; the side die panel 11 is made of a 14mm thick steel plate and is bent into a tooth shape according to the graph of the bridge panel M2, the height is equal to the height of the bridge panel M2 and the thickness of the backing plate 2, the side die panel 11 is provided with a single-edge notch according to the distance between the bridge panel M2 and the steel bar 9, the notch faces downwards, the width of the notch is 3mm larger than the diameter of the bridge panel extending out of the steel bar 9, and the depth of the notch is equal to the height of the bridge panel M2 and the total thickness of the upper and lower edge protection layers of the steel bar; the transverse rib 3 is made into a tooth shape according to the size by using No. 8 channel steel, the channel steel is horizontally placed, an opening of the channel steel faces downwards, and the channel steel is welded on the outer side of the top surface of the side die panel 11; the flange 4 is made of rectangular steel plates, the width of the flange is 80mm, the thickness of the flange is 10mm, the height of the flange is equal to the height of the side die 1, and two M12 bolt holes 5 are arranged.
In the step F, the length of the bamboo plywood 10 is the same as that of the side die 1, the thickness of the bamboo plywood 10 is 12mm, the height of the bamboo plywood 10 is equal to the net distance between two layers of bridge deck slab extending reinforcing steel bars 9, the cross section of the square timber 7 is 100 x 100mm, and the bamboo plywood is made into a tooth shape according to the size.
It should be noted that: the principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. The prefabricated method of the assembled reinforced concrete rectangular bridge deck is characterized by comprising the following specific steps of:
A. installing embedded angle steel and embedded anchor bars at preset positions, pouring a concrete base, and paving a bottom die steel plate on the concrete base, so that the bridge deck can be prevented from warping;
B. the position relation among the position of the bridge deck extending out of the steel bars, the position of the steel bar joint when the bridge deck is assembled and the position of the steel beam shear nail is simulated, verified and adjusted by using a BIM (building information model) technology, so that the position conflict among the bridge deck, the steel bar joint and the steel beam shear nail is avoided when the bridge deck is assembled;
C. a steel bar arrangement formula: l1= i +2A + m a + j, L2= i +2B + n B + j, wherein i =3.6cm, j =6.4cm, L1 is the length of the bridge deck; l2 is the width of the deck slab; l0 and L3 are lengths of the bridge deck extending out of the steel bars; m is the number of the steel bars of the long side L1; n is the number of the grades of the steel bars of the short side L2; a is the steel bar spacing of the long side L1; b is the steel bar spacing of the short side L2; a is the steel bar adjusting distance of the long side L1; b is the steel bar adjusting distance of the short side L2; the steel bars are arranged according to the formula and are bound and welded on the jig frame, and the starting and ending positions of the steel bars are set by adopting a turning and abdicating method;
D. firstly, polishing a bottom die steel plate, lofting according to the designed length and width dimensions of a bridge deck, and flatly paving and fixing the inner side of a base plate on the bottom die steel plate along the periphery according to the lofting dimensions by using a head-to-tail connection method;
E. integrally hoisting reinforcing steel bars of the bridge deck, putting the reinforcing steel bars on a base plate, installing side molds by an inverted insertion method, wherein the side molds form a rectangle and are fixed on the base plate, the side molds are flush with the inner side of the base plate, and the flange joints are all screwed by bolts;
F. the plugging device is made by nailing a bamboo rubber plate and square wood, the plugging device is placed between two layers of bridge deck extending reinforcing steel bars outside the side mold, the bamboo rubber plate is tightly attached to the side mold and used for plugging slurry leakage of a notch of the side mold, the square wood is tightly propped by the vertical limiting reinforcing steel bars, and the vertical limiting reinforcing steel bars are welded on the bridge deck extending reinforcing steel bars;
G. pouring concrete in a rectangular area enclosed by the side molds, dismantling the side molds, roughening the contact surfaces of the concrete and the side molds, maintaining for seven days, and then lifting and storing.
2. The prefabricated method of the assembled reinforced concrete rectangular bridge deck according to claim 1, wherein: in the step A, the thickness of the bottom die steel plate is not less than 8mm, the flatness is less than 2mm, and the sizes of the bottom die steel plate in the length and width directions are respectively 400mm larger than the sizes of the bridge deck in the length and width directions.
3. The prefabricated method of the assembled reinforced concrete rectangular bridge deck according to claim 1, wherein: in the step D, the distance of the inner side of the backing plate is respectively the same as the size of the bridge deck in the length and width directions, the backing plate is a rectangular steel plate, the width of the backing plate is 100mm, and the length of the backing plate extends out 150mm from one side of the end-to-end joint, namely: the length of the backing plate is 150mm longer than the length and width direction of the bridge deck plate, and the thickness of the backing plate is equal to the thickness of the lower edge protection layer of the bridge deck plate extending out of the reinforcing steel bars.
4. The prefabricated method of the assembled reinforced concrete rectangular bridge deck according to claim 1, wherein: in the step D, the backing plate is a toothed steel plate, the distance of the inner side of the backing plate is respectively the same as the length and width dimensions of the bridge deck plate, the width of the backing plate without tooth height is 100mm, the length of the edge with teeth is equal to the length L1 of the bridge deck plate, the length of the straight line edge is equal to the width L2 plus 300mm of the bridge deck plate, and the thickness of the backing plate is equal to the thickness of the lower edge protection layer of the bridge deck plate extending out of the reinforcing steel bar.
5. The prefabricated method of the assembled reinforced concrete rectangular bridge deck according to claim 1, wherein: in the step E, the side mold consists of a side mold panel, a transverse rib and a flange; the side formwork panel is made of a steel plate with the thickness of 14mm, the height of the steel plate is equal to the height of the bridge formwork panel and the thickness of the cushion plate, the side formwork panel is provided with a single-side notch according to the distance between the bridge formwork panel and the steel bar, the notch faces downwards, the width of the notch is 3mm larger than the diameter of the bridge formwork panel extending out of the steel bar, and the depth of the notch is equal to the height of the bridge formwork panel and the total thickness of the upper and lower edge protection layers of the steel bar; the transverse ribs are made of No. 8 channel steel, the channel steel is horizontally placed, an opening of the channel steel faces downwards, and the channel steel is welded on the outer side of the top surface of the side die panel; the flange is made of rectangular steel plates, the width of the flange is 80mm, the thickness of the flange is 10mm, the height of the flange is equal to the height of the side die, and two M12 bolt holes are distributed.
6. The prefabricated method of the assembled reinforced concrete rectangular bridge deck according to claim 1, wherein: in the step E, the side mold consists of a side mold panel, a transverse rib and a flange; the side die panel is bent into a tooth shape by adopting a 14mm thick steel plate according to the pattern of the bridge panel, the height is equal to the height of the bridge panel and the thickness of the cushion plate, the side die panel is provided with a single-side notch according to the distance between the bridge panel and the extending steel bar, the notch faces downwards, the width of the notch is 3mm larger than the diameter of the bridge panel extending the steel bar, and the depth of the notch is equal to the height of the bridge panel and the total thickness of the upper and lower edge protection layers of the steel bar; the transverse ribs are made into tooth shapes according to the size of No. 8 channel steel, the channel steel is horizontally placed, an opening of the channel steel faces downwards, and the channel steel is welded on the outer side of the top surface of the side die panel; the flange is made of rectangular steel plates, the width of the flange is 80mm, the thickness of the flange is 10mm, the height of the flange is equal to the height of the side die, and two M12 bolt holes are distributed.
7. The prefabricated method of the assembled reinforced concrete rectangular bridge deck according to claim 1, wherein: in the step F, the length of the bamboo plywood is the same as that of the side die, the thickness of the bamboo plywood is 12mm, the height of the bamboo plywood is equal to the net distance between the two layers of bridge deck slab extending steel bars, and the cross section size of the square timber is 100 x 100 mm.
8. The prefabricated method of the assembled reinforced concrete rectangular bridge deck according to claim 1, wherein: in the step F, the length of the bamboo plywood is the same as that of the tooth-shaped side die, the thickness of the bamboo plywood is 12mm, the height of the bamboo plywood is equal to the net distance between the two layers of bridge deck slab extending steel bars, the cross section size of the square timber is 100-100 mm, and the bamboo plywood is made into a tooth shape according to the size.
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| CN114589805B (en) | 2023-04-14 |
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