CN116219894A - Bottom die for supporting cast-in-situ bridge deck of reinforced concrete composite beam and construction method - Google Patents
Bottom die for supporting cast-in-situ bridge deck of reinforced concrete composite beam and construction method Download PDFInfo
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- CN116219894A CN116219894A CN202310288899.0A CN202310288899A CN116219894A CN 116219894 A CN116219894 A CN 116219894A CN 202310288899 A CN202310288899 A CN 202310288899A CN 116219894 A CN116219894 A CN 116219894A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
- E01D19/125—Grating or flooring for bridges
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
Abstract
The invention discloses a bottom die for supporting a cast-in-situ bridge deck of a steel-concrete composite beam and a construction method, wherein the bottom die comprises a plurality of truss building carrier plates; the truss floor support plates are all arranged below the bridge deck plates to be poured and are prefabricated members, and each truss floor support plate comprises a bottom plate and a truss structure formed by a plurality of upper chord steel bars, a plurality of lower chord steel bars and a plurality of web member steel bars; a top edge reinforcing steel bar is arranged above the upper chord reinforcing steel bar; the outer sides of the two lower chord steel bars below the upper chord steel bars are respectively provided with a bottom edge reinforcing steel bar, and are respectively fixed on the corresponding girder flanges by adopting cushion blocks, and the length of at least one bottom edge reinforcing steel bar extends and spans the adjacent nearest box chamber, so that the cantilever section steel bar truss floor carrier plate of the boundary beam bridge deck slab can self-stand before pouring; and one outward side of the cantilever floor support plate is provided with L-shaped wood forms and U-shaped positioning steel bars. On the premise of meeting the structural safety, the invention can omit the procedures of installing and removing the template on site, reduce the risk of on-site high-altitude operation and save the cost of the bracket template.
Description
Technical Field
The invention relates to the technical field of bridge construction, in particular to a bottom die for supporting a cast-in-situ bridge deck of a reinforced concrete composite beam and a construction method.
Background
Steel-concrete composite beams are beams that are integrally joined by steel beams and concrete slabs and that are capable of being commonly stressed in cross section.
In the existing municipal engineering, large-span bridge structures crossing major intersections and the like mostly adopt steel-concrete composite girder simple supporting structures, the construction process mostly adopts a mode that steel structure girders are prefabricated in sections in factories and then transported to field hoisting, and reinforced concrete bridge deck structures are cast again after the steel girders are hoisted and formed. The steel-concrete composite beam concrete deck form support has been a difficulty with this bridge, particularly the cantilever portion.
In the prior art, triangular brackets are uniformly distributed on the lower side of the flange plate in the current construction of the flange plate on the outer side of the steel beam, the triangular brackets are fixedly connected with the side web plates, the top end of each bracket is provided with a supporting square timber, and high-quality bamboo plywood is paved after the brackets are assembled to serve as a bottom die of the flange plate. The steel plate bottom die is additionally arranged and the floor support is erected, so that the work efficiency and the safety are poor.
Due to the construction of cast-in-situ slabs, a large number of brackets and templates are still required, which has great deviation from the field construction management requirements of the steel structure and is not matched with the whole construction process.
Therefore, how to realize a construction platform and a construction method without support and demolding is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the defects in the prior art, the invention provides the bottom die and the construction method for the cast-in-situ bridge deck support of the reinforced concrete composite beam, and the realization aims to avoid the procedures of installing and removing the templates on site, reduce the risk of on-site high-altitude operation and save the cost of the support templates on the premise of meeting the structural safety.
In order to achieve the purpose, the invention discloses a bottom die for supporting a cast-in-situ bridge deck of a reinforced concrete composite beam, which comprises a plurality of truss floor bearing plates which are arranged in a rectangular array on a bridge plan view.
Each truss floor support plate is arranged below a bridge deck to be poured and is a prefabricated member, and each truss floor support plate comprises a bottom plate and a truss structure formed by a plurality of upper chord steel bars, a plurality of lower chord steel bars and a plurality of web member steel bars;
a box girder structure comprising steel cross beams and steel longitudinal beams is arranged below the truss floor carrier plates; the truss floor support plates positioned in the range of any box chamber of the box girder structure are box chamber upper opening floor support plates, the truss floor support plates crossing two adjacent box chambers are inter-box chamber truss floor support plates, and the two truss floor support plates positioned on the outer side cantilever plates of the side girders at two sides are cantilever floor support plates;
each bottom plate is connected with the corresponding steel beam flange in a lap joint mode;
every two adjacent truss floor support plates are connected through a buckle;
a top edge reinforcing steel bar is arranged above each upper chord reinforcing steel bar;
the outer sides of the two lower chord steel bars below each upper chord steel bar are respectively provided with a bottom edge reinforcing steel bar, and are fixed on corresponding steel beam flanges by adopting cushion blocks, and the length of at least one bottom edge reinforcing steel bar extends and spans the adjacent nearest box chamber and is fixed with the box chamber, so that each cantilever building carrier plate can stand by itself before pouring;
and one outward side of each cantilever building carrier plate is provided with an L-shaped wood pattern and a U-shaped positioning steel bar.
Preferably, a plurality of the upper chord steel bars of each truss floor carrier plate are arranged in parallel to form the upper surface of the truss structure;
two sides below each upper chord steel bar are symmetrically provided with one lower chord steel bar respectively to form the lower surface of the truss structure;
both ends of all the lower chord steel bars are respectively connected with the support transverse bars at the corresponding ends;
both ends of all the upper chord steel bars are respectively connected with the support transverse bars at the corresponding positions through support vertical bars at the corresponding ends;
the web member steel bars are penetrated and wound in a reciprocating manner to form the truss structure by all the lower chord steel bars and all the upper chord steel bars;
the bottom plate of each truss floor carrier plate is fixed with the lower surface of the corresponding truss structure.
More preferably, each bottom plate is fixedly connected with each corresponding lower chord steel bar through resistance spot welding;
each bottom plate is a pressed galvanized steel plate with the thickness below 0.6 mm.
Preferably, the bridge deck is positioned at the bridge deck widening section, the central lines of all the steel cross beams positioned at the support are parallel to the split hole lines, and a plurality of steel cross beams positioned in the span are arranged in a fold line and are perpendicular to the central lines of the corresponding box chambers of the box girder structure;
when each truss floor support plate is arranged, orthogonal staggered arrangement is carried out by adjusting the lapping amount through parallel split hole lines;
the bridge deck width-changing section is provided with wood molds in local areas on two sides of each steel diaphragm beam in the midspan;
each wood form is used for pouring a longitudinal cantilever between the corresponding bridge deck and the corresponding steel diaphragm.
More preferably, the bridge deck is not required to be provided with a pre-arched part, and all the top edge reinforcing steel bars and all the bottom edge reinforcing steel bars of all the corresponding cantilever building deck are obliquely arranged according to the transverse slopes of the corresponding positions of the bridge deck;
the bridge deck slab is provided with a part with pre-camber, and all top edge reinforcing steel bars and all bottom edge reinforcing steel bars of the cantilever floor deck slab are bent in advance at the transverse cantilever positions and are fixedly connected with the corresponding upper chord steel bars and the corresponding lower chord steel bars in the cantilever floor deck slab by lap welding.
Preferably, each L-shaped wood pattern covers the lower surface and the outer side surface of the corresponding cantilever building carrier plate;
each U-shaped positioning steel bar is bent around the upper surface, the outer side surface and the lower surface of the corresponding cantilever building carrier plate and fixedly connected with the corresponding upper chord steel bar.
The invention also provides a construction method of the bottom die supported by the cast-in-situ bridge deck of the reinforced concrete composite beam, which comprises the following steps:
and 6, arranging the L-shaped wood die and the U-shaped positioning steel bars on one outward side surface of each cantilever floor support plate.
Preferably, in step 5, an inverted T cap beam is disposed between every two adjacent bridge decks;
in step 5, the bridge deck plate at the top of the inverted T-shaped bent cap is provided with a support for the wooden pattern corresponding to each longitudinal cantilever, and the wooden pattern is used as a bottom die for construction.
Preferably, in step 6, an L-shaped wood pattern and a U-shaped positioning steel bar are disposed on an outward side of each cantilever building carrier plate, the corresponding L-shaped wood pattern and the corresponding U-shaped positioning steel bar are fixed first, and then the corresponding L-shaped wood pattern and the corresponding U-shaped positioning steel bar are mounted on the cantilever building carrier plates and welded and fixed with the corresponding upper chord steel bar.
Preferably, after finishing the laying of all the truss deck plates, the construction of the bridge deck plate is performed, including the steps of
the top edge longitudinal main bars are supported on the upper chord steel bars or are firstly placed on the steel girder flanges;
lifting all the top edge longitudinal main bars placed on the steel girder flanges to the height of the corresponding top edge transverse main bars, and fixedly connecting the top edge longitudinal main bars with iron wire binding or tie bars;
and 14, spraying intermediate paint and finishing paint on the exposed parts of all the truss floor support plates.
The invention has the beneficial effects that:
the invention adopts the truss floor carrier plate to solve the problem of supporting the bottom die of the concrete bridge deck of the steel-concrete composite beam, and can avoid the procedures of installing and removing the templates on site, reduce the risk of on-site high-altitude operation and save the cost of the support templates on the premise of meeting the structural safety.
The cantilever floor carrier plate structure solves the problems of difficult construction and high construction safety risk of the cantilever part of the bridge deck, the bracket work is not required to be erected below the cantilever part of the bridge deck, the investment cost is low, the installation is convenient and quick, the occupied space is small, the construction safety risk is low, the safety performance is ensured, and the construction efficiency is effectively improved.
The truss floor carrier plate is automatically produced in factories, the production quality can be ensured, the processing efficiency is improved, the bridge deck plate flow production can be realized under the condition that the engineering cost is not basically increased, the construction is fast, the construction period is saved, and the influence on site traffic during the construction period can be reduced.
The invention works together with concrete through the steel bar truss, and the upper chord member and the lower chord member of the steel bar truss act as the steel bars arranged on the upper side and the lower side of a common reinforced concrete floor slab. The configuration of bridge deck steel bars can be properly reduced so as to save the construction cost.
According to the invention, the steel bar truss floor support plate is integrally welded with the floor support plate truss steel bars at the inner side and the outer side of the combined beam box body through the top edge reinforcing steel bars and the bottom edge reinforcing steel bars, so that the steel bar truss floor support plate is placed on the steel beam integrally.
The conception, specific structure, and technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, features, and effects of the present invention.
Drawings
FIG. 1 shows a bottom die layout of a steel-concrete composite beam characteristic section according to an embodiment of the invention.
FIG. 2 illustrates a floor standing layout of a modular deck floor in accordance with one embodiment of the present invention.
FIG. 3 illustrates a floor plan view of a deck-widening section composite girder bridge deck slab in accordance with one embodiment of the present invention.
FIG. 4 shows a bottom floor plan view of a bridge deck slab of a bridge deck equal width section in an embodiment of the present invention.
Fig. 5 is a schematic elevation view of a finished product of a standard section steel bar truss floor carrier plate in an embodiment of the invention.
Fig. 6 shows a schematic cross-sectional view of a finished product of a standard section steel bar truss floor carrier plate in an embodiment of the invention.
FIG. 7 illustrates a floor plan view of a cast-in-place deck slab of a composite beam in accordance with one embodiment of the present invention.
Figure 8 illustrates a cross-sectional view of a deck slab cantilever section bar truss floor deck in accordance with one embodiment of the invention.
Fig. 9 illustrates a bridge deck transverse cantilever end form layout in accordance with one embodiment of the present invention.
Fig. 10 shows a large sample of the cross-sectional layout of the deck rebar in an embodiment of the invention.
Detailed Description
Examples
As shown in fig. 1 to 10, the bottom die for supporting the cast-in-situ bridge deck of the steel-concrete composite beam comprises a plurality of truss floor support plates 1 which are arranged in a rectangular array on a bridge plan view.
Each truss floor carrier plate 1 is arranged below a bridge deck 2 to be poured and is a prefabricated member, and comprises a bottom plate 3 and a truss structure formed by a plurality of upper chord steel bars 4, a plurality of lower chord steel bars 5 and a plurality of web member steel bars 6;
a box girder structure comprising a steel cross beam 7 and a steel longitudinal beam 8 is arranged below the truss floor carrier plate 1; the truss floor support plates 1 positioned in the range of any box room of the box girder structure are box room upper opening floor support plates 9, the truss floor support plates 1 crossing two adjacent box rooms are inter-box room truss floor support plates 10, and the two truss floor support plates 1 positioned on the outer side cantilever plates of the side girders on the two sides are cantilever floor support plates 11;
each bottom plate 3 and the corresponding steel beam flange 12 are connected by lap joint;
every two adjacent truss floor support plates 1 are connected through buckles;
a top edge reinforcing steel bar 13 is arranged above each upper chord reinforcing steel bar 4;
the outer sides of the two lower chord steel bars 5 below each upper chord steel bar 4 are respectively provided with a bottom edge reinforcing steel bar 14, and are fixed on the corresponding steel beam flange 12 by adopting cushion blocks, and the length of at least one bottom edge reinforcing steel bar 14 extends and spans the nearest adjacent box chamber and is fixed with the box chamber, so that each cantilever building carrier plate 11 can stand by itself before pouring;
an L-shaped wood die 15 and a U-shaped positioning steel bar 16 are arranged on one outward side of each cantilever building carrier plate 11.
In practical application, each truss floor support plate is produced by adopting a factory automation production line mode, and is produced and lifted to the site according to the practical planar arrangement requirement of the floor support plate.
At least one bottom edge reinforcing steel bar of the two bottom edge reinforcing steel bars corresponding to each upper chord reinforcing steel bar of each cantilever building carrier plate extends in length and spans across the adjacent nearest box chamber, so that the cantilever segment steel bar truss building carrier plate of each side beam bridge deck can be ensured to self-stand before pouring, and the bottoms of the two bottom edge reinforcing steel bars are fixed on the steel beam flange 12 plates by adopting cushion blocks and cannot be welded with the steel beam flange 12 plates.
In some embodiments, the plurality of upper chord steel bars 4 of each truss floor carrier plate 1 are arranged in parallel to form an upper surface of the truss structure;
two sides below each upper chord steel bar 4 are symmetrically provided with a lower chord steel bar 5 respectively to form the lower surface of the truss structure;
both ends of all lower chord steel bars 5 are respectively connected with support transverse bars 17 at the corresponding ends;
both ends of all the upper chord steel bars 4 are respectively connected with the support transverse bars 17 at the corresponding positions through support vertical bars 18 at the corresponding ends;
the web member steel bars 6 are wound around all the lower chord steel bars 5 and all the upper chord steel bars 4 in a reciprocating manner to form a truss structure;
the bottom plate 3 of each truss deck 1 is secured to the lower surface of the corresponding truss structure.
In some embodiments, each bottom plate 3 is fixedly connected to a corresponding each lower chord rebar 5 by resistance spot welding;
each of the bottom plates 3 is a pressed galvanized steel sheet having a thickness of 0.6 mm or less.
In some embodiments, the bridge deck 2 is positioned at the bridge deck widening section, the central lines of all the steel cross beams 7 positioned at the support 20 are parallel to the split hole lines, and a plurality of steel cross beams 19 positioned in the midspan are arranged in a fold line and are perpendicular to the central lines of corresponding chambers of the box beam structure;
when each truss floor support plate 1 is arranged, orthogonal staggered arrangement is carried out by adjusting the overlap amount through parallel split hole lines;
at the bridge deck widening section, wood forms 21 are arranged in the local areas on two sides of each steel diaphragm beam 19 in the midspan;
each wood form 21 is used to cast a longitudinal cantilever 22 between the respective deck slab 2 and the respective steel spreader beam 19.
In practical application, when each steel bar truss floor support plate 1 is arranged, the orthogonal staggered arrangement is carried out by adjusting the overlap amount through parallel hole dividing lines, so that oblique interweaving with the steel bars of the bridge deck 2 can be avoided.
In some embodiments, in the portion of the bridge deck 2 where the pre-camber is not required, all the top edge reinforcing steel bars 13 and all the bottom edge reinforcing steel bars 14 of all the corresponding cantilever floor deck 11 are obliquely arranged according to the transverse slope of the corresponding position of the bridge deck 2;
at the part of the bridge deck 2 where the pre-camber is required, all top edge reinforcing steel bars 13 and all bottom edge reinforcing steel bars 14 of all corresponding cantilever building carrier plates 11 bend the steel bars in advance at the transverse cantilever positions, and are connected and fixed with corresponding upper chord steel bars 4 and corresponding lower chord steel bars 5 in the cantilever building carrier plates 11 by lap welding.
In some embodiments, each L-shaped wood pattern 15 covers the underside and the outside of the corresponding outrigger floor deck 11;
each U-shaped positioning steel bar 16 is bent around the upper side, the outer side and the lower side of the corresponding cantilever floor support plate 11 and fixedly connected with the corresponding upper chord steel bar 4.
In practical application, when the length of the transverse cantilever arm of the cast-in-situ bridge deck is longer, and the pre-camber is required to be set, the cantilever arm pre-camber can be adjusted by bending reinforcing steel bars, and the problem of difficult bending of the template can be avoided.
The invention also provides a construction method of the bottom die supported by the cast-in-situ bridge deck of the reinforced concrete composite beam, which comprises the following steps:
and 6, arranging an L-shaped wood die 15 and a U-shaped positioning steel bar 16 on the outward side surface of each cantilever floor support plate 11.
In certain embodiments, in step 5, an inverted T cap beam 23 is provided between each two adjacent deck boards 2;
in step 5, a support for the wooden pattern is provided at the bridge deck 2 on top of the inverted T cap beam 23 corresponding to each of the longitudinal cantilever arms 22, and the wooden pattern is used as a bottom mold for construction.
In some embodiments, in step 6, an L-shaped wood pattern 15 and a U-shaped positioning bar 16 are disposed on an outward side of each cantilever floor support plate 11, the corresponding L-shaped wood pattern 15 and the corresponding U-shaped positioning bar 16 are fixed, and then the corresponding L-shaped wood pattern 15 and the corresponding U-shaped positioning bar 16 are mounted on the cantilever floor support plate 11 and welded and fixed with the corresponding upper chord bar 4.
In some embodiments, after the laying of all truss deck plates 1 is completed, the construction of deck plates 2 is performed, including the steps of
the top edge longitudinal main bars 26 are supported above the upper chord steel bars 4 or are firstly laid on the girder flanges 12;
all top edge longitudinal main ribs 26 resting on the girder flanges 12 are lifted to the height of the corresponding top edge transverse main ribs 27, and are fixedly connected by adopting iron wire binding or tie steel bars 28;
and 14, spraying intermediate paint and finishing paint on exposed parts of all truss floor support plates 1.
The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (10)
1. Bottom die supported by cast-in-situ bridge deck of steel-concrete composite beam; the bridge is characterized by comprising a plurality of truss floor support plates (1) which are arranged in a rectangular array on a bridge plan view;
each truss floor support plate (1) is arranged below a bridge deck (2) to be poured and is a prefabricated member, and comprises a bottom plate (3) and a truss structure formed by a plurality of upper chord steel bars (4), a plurality of lower chord steel bars (5) and a plurality of web member steel bars (6);
a box girder structure comprising steel cross beams (7) and steel longitudinal beams (8) is arranged below the truss floor support plates (1); the truss floor support plates (1) positioned in the range of any box room of the box girder structure are box room upper opening floor support plates (9), the truss floor support plates (1) crossing two adjacent box rooms are inter-box room truss floor support plates (10), and the two truss floor support plates (1) positioned on the outer side cantilever plates of the side girders at the two sides are cantilever floor support plates (11);
each bottom plate (3) is connected with the corresponding steel girder flange (12) in a lap joint manner;
every two adjacent truss floor support plates (1) are connected through buckles;
a top edge reinforcing steel bar (13) is arranged above each upper chord steel bar (4);
the outer sides of the two lower chord steel bars (5) below each upper chord steel bar (4) are respectively provided with a bottom edge reinforcing steel bar (14), and are respectively fixed on the corresponding steel beam flanges (12) by adopting cushion blocks, and at least one bottom edge reinforcing steel bar (14) extends in length and spans the adjacent nearest box chamber and is fixed with the box chamber, so that each cantilever building carrier plate (11) can self-stand before pouring;
and one side of each cantilever building carrier plate (11) outwards is provided with an L-shaped wood die (15) and a U-shaped positioning steel bar (16).
2. The bottom die supported by the cast-in-situ bridge deck of the steel-concrete composite beam according to claim 1, wherein a plurality of upper chord steel bars (4) of each truss floor carrier plate (1) are arranged in parallel to form the upper surface of the truss structure;
two sides below each upper chord steel bar (4) are symmetrically provided with one lower chord steel bar (5) respectively to form the lower surface of the truss structure;
both ends of all the lower chord steel bars (5) are respectively connected with the support transverse bars (17) at the corresponding ends;
both ends of all the upper chord steel bars (4) are respectively connected with the support transverse bars (17) at corresponding positions through support vertical bars (18) at corresponding ends;
the web member steel bars (6) are wound around all the lower chord steel bars (5) and all the upper chord steel bars (4) in a reciprocating manner to form the truss structure;
the bottom plate (3) of each truss floor support plate (1) is fixed with the lower surface of the corresponding truss structure.
3. The bottom die supported by the cast-in-situ bridge deck of the steel-concrete composite beam according to claim 2, wherein each bottom plate (3) is fixedly connected with each corresponding lower chord steel bar (5) through resistance spot welding;
each bottom plate (3) is a pressed galvanized steel sheet with the thickness below 0.6 mm.
4. The bottom die supported by the cast-in-situ bridge deck of the steel-concrete composite beam according to claim 1, wherein the bridge deck (2) is positioned at a bridge deck widening section, the central lines of all steel cross beams (7) positioned at a support (20) are parallel to a split hole line, and a plurality of steel cross beams (19) positioned in a midspan are arranged in a fold line and are perpendicular to the central lines of corresponding box chambers of the box beam structure;
when each truss floor support plate (1) is arranged, orthogonal staggered arrangement is carried out by adjusting the lapping amount through parallel hole dividing lines;
a wood die (21) is arranged in the bridge deck widening section and in the partial areas on two sides of each steel diaphragm beam (19) in the midspan;
each of the wooden forms (21) is used for casting a longitudinal cantilever arm (22) between the corresponding bridge deck (2) and the corresponding steel diaphragm (19).
5. The bottom die for supporting the cast-in-situ bridge deck of the reinforced concrete composite beam according to claim 5, wherein the bridge deck (2) does not need to be provided with a part with pre-camber, and all the top edge reinforcing steel bars (13) and all the bottom edge reinforcing steel bars (14) of all the cantilever floor deck (11) are correspondingly obliquely arranged according to the transverse slope of the corresponding position of the bridge deck (2);
the bridge deck plate (2) is provided with a pre-camber part, all top edge reinforcing steel bars (13) and all bottom edge reinforcing steel bars (14) of all corresponding cantilever building carrier plates (11) are bent in advance at transverse cantilever positions, and are connected and fixed with corresponding upper chord steel bars (4) and corresponding lower chord steel bars (5) of the cantilever building carrier plates (11) by lap welding.
6. The bottom die supported by the steel-concrete composite beam cast-in-situ bridge deck according to claim 1, wherein each L-shaped wood die (15) covers the lower surface and the outer side surface of the corresponding cantilever floor support plate (11);
each U-shaped positioning steel bar (16) is bent around the upper surface, the outer side surface and the lower surface of the corresponding cantilever building carrier plate (11) and fixedly connected with the corresponding upper chord steel bar (4).
7. The construction method of the bottom die supported by the cast-in-situ bridge deck of the steel-concrete composite beam according to claim 1, comprising the following steps:
step 1, prefabricating all truss floor support plates (1), all steel cross beams (7) and steel longitudinal beams (8) in a factory, and transporting to a construction site;
step 2, arranging temporary buttresses to erect all the steel cross beams (7) and the steel longitudinal beams (8) to form the box girder structure;
step 3, placing all truss floor carrier plates (1) on the box girder structure;
step 4, arranging the top edge reinforcing steel bars (13) and the bottom edge reinforcing steel bars (14) on each cantilever floor support plate (11);
step 5, arranging a mould corresponding to the longitudinal cantilever arm (22) of each bridge deck (2);
and 6, arranging the L-shaped wood die (15) and the U-shaped positioning steel bars (16) on one outward side surface of each cantilever floor support plate (11).
8. The construction method of the bottom die supported by the cast-in-situ bridge deck of the steel-concrete composite beam, as claimed in claim 7, characterized in that in the step 5, an inverted T-shaped bent cap (23) is arranged between every two adjacent bridge decks (2);
in step 5, the bridge deck (2) at the top of the inverted T-shaped bent cap (23) is provided with a support for the wooden pattern corresponding to each longitudinal cantilever (22), and the wooden pattern is used as a bottom die for construction.
9. The construction method of the bottom die supported by the steel-concrete composite beam cast-in-situ bridge deck according to claim 7, wherein in the step 6, an L-shaped wood die (15) and a U-shaped positioning steel bar (16) are arranged on one outward side surface of each cantilever floor support plate (11), the corresponding L-shaped wood die (15) and the corresponding U-shaped positioning steel bar (16) are fixed first, and then the corresponding L-shaped wood die (15) and the corresponding U-shaped positioning steel bar (16) are mounted on the cantilever floor support plates (11) and welded and fixed with the corresponding upper chord steel bars (4).
10. The construction method of the bottom die for supporting the cast-in-situ bridge deck of the steel-concrete composite girder according to claim 7, wherein the construction of the bridge deck (2) is performed after the laying of all the truss deck (1) is completed, comprising the steps of
Step 8, paving the transverse main ribs (24) and the longitudinal main ribs (25) of the bottom edge of the bridge deck plate (2) on all the truss floor carrier plates (1) which are paved in sequence;
step 9, binding the crossing points of the bottom edge transverse main ribs (24) and the bottom edge longitudinal main ribs (25) by adopting iron wires after the bottom edge transverse main ribs (24) and the bottom edge longitudinal main ribs (25) are paved;
step 10, paving a top edge longitudinal main rib (26);
the top edge longitudinal main rib (26) is supported on the upper chord steel bar (4) or is firstly placed on the steel girder flange (12);
step 11, paving a top edge transverse main rib (27), and binding the crossing points of the top edge longitudinal main rib (26) and the top edge transverse main rib (27) by adopting iron wires;
all the top edge longitudinal main ribs (26) placed on the steel beam flanges (12) are lifted to the height of the corresponding top edge transverse main ribs (27), and are fixedly connected by adopting iron wire binding or tie steel bars (28);
step 12, testing the pressure of all truss floor support plates (1) by using weights to ensure stability;
step 13, pouring the bridge deck plates (2) from the upper opening floor support plates (9) of each box chamber, and finally pouring the positions corresponding to the cantilever floor support plates (11);
and 14, spraying intermediate paint and finishing paint on exposed parts of all truss floor support plates (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310288899.0A CN116219894A (en) | 2023-03-23 | 2023-03-23 | Bottom die for supporting cast-in-situ bridge deck of reinforced concrete composite beam and construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310288899.0A CN116219894A (en) | 2023-03-23 | 2023-03-23 | Bottom die for supporting cast-in-situ bridge deck of reinforced concrete composite beam and construction method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116219894A true CN116219894A (en) | 2023-06-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310288899.0A Pending CN116219894A (en) | 2023-03-23 | 2023-03-23 | Bottom die for supporting cast-in-situ bridge deck of reinforced concrete composite beam and construction method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116219894A (en) |
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2023
- 2023-03-23 CN CN202310288899.0A patent/CN116219894A/en active Pending
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