CN117626786A - Prefabricated steel-concrete composite beam and its construction method - Google Patents
Prefabricated steel-concrete composite beam and its construction method Download PDFInfo
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- CN117626786A CN117626786A CN202311792032.5A CN202311792032A CN117626786A CN 117626786 A CN117626786 A CN 117626786A CN 202311792032 A CN202311792032 A CN 202311792032A CN 117626786 A CN117626786 A CN 117626786A
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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
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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
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
- E01D2101/28—Concrete reinforced prestressed
- E01D2101/285—Composite prestressed concrete-metal
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Abstract
The invention relates to an assembled steel-concrete combined beam and a construction method thereof. The existing fabricated steel-concrete combined beam structure is difficult to meet the use requirements of a large-span hybrid bridge. The cross section of the assembled steel-concrete combined beam is P-shaped, and the assembled steel-concrete combined beam comprises a steel beam section, a steel-concrete combined section and a concrete section which are connected in sequence longitudinally; the steel-concrete combination section and the concrete Duan Nafen are distributed with transverse prestress steel strands, and the ends of the prestress steel strands are anchored in the steel beam section. The invention adopts factory prefabrication and assembly construction, meets the requirement of quality control, reduces the influence of factors such as environment on the quality of the beam section, and accelerates the construction progress; the steel-concrete combined section has good stress performance and convenience in assembly type construction, is suitable for large-span mixed bridge construction, greatly shortens construction period and improves construction quality.
Description
Technical Field
The invention relates to the technical field of bridge engineering construction, in particular to an assembled steel-concrete combined beam and a construction method thereof.
Background
The steel-concrete combined beam comprises two materials of steel and concrete, and after reasonable combination, the advantages of high tensile strength, good plasticity and good compressive property of the concrete are fully exerted, so that the steel-concrete combined beam is increasingly applied to roads and railway bridges. The construction of the steel-concrete combined beam is generally carried out by adopting the mode of steel box beam field assembly and concrete field pouring, and the steel box beam has a complex structure, complex field environmental factors, difficult quality control, high safety risk, traffic influence and long construction period.
At present, the assembly construction of the reinforced concrete combined beam can be completely realized at the level of hoisting tonnage and construction technology, so that the assembly improvement of the construction technology of the reinforced concrete combined beam can be realized, and the bridge construction quality and the bridge construction efficiency are improved. However, most of the existing steel-concrete combined beams can only be used in building structures, and are of solid structures, small in section and limited in bearing capacity, and are difficult to be applied to bridge structures bearing heavy loads, particularly large-span bridge structures.
Therefore, there is a need to design new steel-concrete composite beam structures for bridge construction, which overcomes the above-mentioned drawbacks.
Disclosure of Invention
The invention aims to provide an assembled steel-concrete combined beam and a construction method thereof, which are used for solving the problem that the existing assembled steel-concrete combined beam structure is difficult to meet the use requirement of a large-span hybrid bridge.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the cross section of the fabricated steel-concrete combined beam is P-shaped and comprises a steel beam section, a steel-concrete combined section and a concrete section which are longitudinally and sequentially connected;
the steel-concrete combination section and the concrete Duan Nafen are distributed with longitudinal prestress steel strands, and the ends of the prestress steel strands are anchored in the steel beam section.
Further, the steel beam section comprises an outer steel plate, a top plate and a bottom plate;
the top plate and the bottom plate are horizontally arranged in an up-down parallel manner, the transverse inner ends of the top plate and the bottom plate correspond to each other up and down, and the transverse width of the top plate is larger than that of the bottom plate;
the outer steel plate is longitudinally and vertically arranged between the top plate and the bottom plate, two outer steel plates are arranged between the top plate and the bottom plate and are respectively positioned at two transverse ends of the bottom plate.
Further, T-shaped stiffening ribs are arranged on the inner side of the outer steel plate, the bottom surface of the top plate and the top surface of the bottom plate.
Further, the steel-concrete combination section comprises an outer steel plate, an inner steel plate and a bearing plate;
the outer steel plate and the inner steel plate form a P-shaped steel box, and the bearing plates are positioned at the front end and the rear end of the P-shaped steel box in the longitudinal direction;
and steel-concrete joint section concrete is filled in the P-shaped steel box.
Further, the P-shaped steel box is internally provided with a vertically and horizontally arranged perforated steel plate, the perforated steel plate divides the P-shaped steel box into a plurality of longitudinal cavities, penetrating steel bars are inserted into the holes of the perforated steel plate, and the penetrating steel bars are arranged along the inner wall of the P-shaped steel box.
Further, the inner wall of the P-shaped steel box is provided with a shear connection key perpendicular to the inner wall of the P-shaped steel box, and the shear connection key comprises PBL steel bars and shear nails.
Further, longitudinal prestress corrugated pipes are preset in the P-shaped steel box and the concrete section, the prestress steel strands are inserted into the prestress corrugated pipes, and the end parts are anchored at the outer sides of the bearing plates through anchors.
Further, the outer steel plate at the top of the reinforced concrete combination section is connected with the top plate of the steel beam section into a whole;
the outer steel plate at the bottom of the steel-concrete combination section is connected with the bottom plate of the steel beam section into a whole.
Further, the concrete section is a reinforced concrete structure.
In another aspect, there is provided a construction method of the fabricated reinforced concrete beam, the method comprising:
penetrating a prestress steel strand into the prestress corrugated pipe of the P-shaped steel box and the concrete section, and installing an anchor of the prestress steel strand in the steel beam section;
and tensioning the prestressed steel strand according to the design requirement, grouting the pore canal, and connecting the assembled reinforced concrete bonding beam with the adjacent beam end through bolt connection or wet joint.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides an assembled steel-concrete combined beam and a construction method thereof, wherein the steel-concrete combined beam is prefabricated and assembled in a factory, so that the requirement of quality control is met, the influence of factors such as environment on the quality of a beam section is reduced, and the construction progress is accelerated. In addition, the assembled steel-concrete combined beam integrates good stress performance of the steel-concrete combined section and convenience of assembled construction, adopts a cavity structure, is provided with an inner steel shell and an outer steel shell, the steel shells and concrete are combined to form the steel-concrete structure, the dead weight of the structure is reduced, the cross-sectional area is increased, the performances of the two materials are fully exerted, the bearing capacity of the structure is improved, the assembled steel-concrete combined beam is suitable for large-span mixed bridge construction, the construction period is greatly shortened, and the construction quality is improved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other embodiments of the drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a vertical longitudinal section of the present invention (section A-A in FIGS. 3-5).
FIG. 2 is a horizontal longitudinal section of the present invention (section I-I in FIGS. 3-5).
Fig. 3 is a sectional view of B-B in fig. 1.
Fig. 4 is a C-C section view of fig. 1.
Fig. 5 is a sectional view D-D of fig. 1.
Fig. 6 is a perspective view of the present invention.
Fig. 7 is a perspective view of the steel structure of the steel girder segment and the reinforced concrete joint segment of the present invention.
FIG. 8 is a B-B cross-sectional view of the left and right splice of the present invention.
FIG. 9 is a C-C cross-sectional view of the left and right splice of the present invention.
FIG. 10 is a D-D sectional view of the left and right splice of the present invention.
The marks in the figure are as follows:
1-steel beam section, 2-steel-concrete combination section, 3-concrete section and 4-prestress steel strand;
101-T-shaped stiffening ribs, 102-outer steel plates, 103-top plates and 104-bottom plates;
201-perforated steel plates, 202-shear connection keys, 203-penetrating steel bars, 204-reinforced concrete combined section concrete, 205-outer steel plates, 206-inner steel plates, 207-bearing plates, 208-PBL steel bars and 209-shear nails;
301-concrete section concrete;
401-prestressed bellows, 402-anchors.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. The drawings illustrate preferred embodiments of the invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "longitudinal", "transverse", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "disposed," and the like are to be construed broadly and may be fixedly connected, disposed, detachably connected, disposed, or integrally connected, disposed, for example. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the specific embodiment, a direction from left to right in fig. 1 is defined as a longitudinal direction, a direction perpendicular thereto is defined as a transverse direction, a direction from top to bottom in fig. 1 is defined as a vertical direction, and a direction perpendicular thereto is defined as a horizontal direction.
The invention provides an assembled steel-concrete combined beam, as shown in fig. 6 and 7, the cross section of the assembled steel-concrete combined beam is P-shaped, and the assembled steel-concrete combined beam comprises a steel beam section 1, a steel-concrete combined section 2 and a concrete section 3 which are longitudinally and sequentially connected, wherein the three combined sections are of a P-shaped structure, one side of the assembled steel-concrete combined beam is a cuboid box, and the outer side of the top of the cuboid box is a horizontal plate box. Longitudinal prestressed steel strands 4 are distributed in the steel-concrete combined section 2 and the concrete section 3, and the ends of the prestressed steel strands 4 are anchored in the steel beam section 1.
As shown in fig. 1, 2 and 3, the steel girder segment 1 includes an outer steel plate 102, a top plate 103 and a bottom plate 104. The top plate 103 and the bottom plate 104 are horizontally arranged in parallel up and down, the lateral inner ends of the top plate 103 and the bottom plate 104 correspond up and down, and the lateral width of the top plate 103 is larger than the lateral width of the bottom plate 104. The outer steel plate 102 is vertically disposed longitudinally between the top plate 103 and the bottom plate 104 and is provided in two, respectively at both lateral ends of the bottom plate 104. T-shaped stiffening ribs 101 are arranged on the inner side of the outer steel plate 102, the bottom surface of the top plate 103 and the top surface of the bottom plate 104 so as to improve the strength of the inner structure of the steel beam section 1.
The outer steel plate 102 is welded to both the top plate 103 and the bottom plate 104, and the T-stiffener 101 is also fixed to the outer steel plate 102, the top plate 103 and the bottom plate 104 by welding.
T-shaped stiffening ribs 101 are right trapezoid, the top edges of the T-shaped stiffening ribs 101 are far away from the reinforced concrete combination section 2 after being fixed, and the inclined edges of all the T-shaped stiffening ribs 101 form a transition section, so that the smooth transition of rigidity between the steel beam section 1 and the concrete section 3 is realized.
As shown in fig. 1, 2, 4, 5, the reinforced concrete joint section 2 includes an outer steel plate 205, an inner steel plate 206, and a bearing plate 207. The outer steel plate 205 is surrounded by the outer steel plate 205, the inner steel plate 206 is positioned inside the outer steel plate 205, the outer steel plate 205 and the inner steel plate 206 form a P-shaped steel box, the bearing plates 207 are positioned at the front end and the rear end of the P-shaped steel box in the longitudinal direction, and the bearing plates 23 are also P-shaped. The P-shaped steel box is filled with steel-concrete joint section concrete 204. The P-shaped steel box is internally provided with vertically and horizontally arranged perforated steel plates 201, the perforated steel plates 201 divide the P-shaped steel box into a plurality of longitudinal cavities, penetrating steel bars 203 are inserted into the holes of the perforated steel plates 201, and the penetrating steel bars 203 are arranged along the inner wall of the P-shaped steel box. The inner wall of the P-shaped steel box is provided with a shear connector 202 perpendicular to the inner wall of the P-shaped steel box, and the shear connector 202 comprises PBL steel bars 208 and shear nails 209. The penetrating reinforcement 203, the PBL reinforcement 208 and the shear pins 209 are distributed in a crisscross manner.
The cavities in the upper part and the lower part of the P-shaped steel box are first sub-cells, and the cavities in the side surfaces of the P-shaped steel box are second sub-cells. The arrangement directions of the penetrating steel bars 203 and the PBL steel bars 208 and the shear nails 209 in the first sub-cells and the second sub-cells are opposite, so that the stresses on the two sides and in the middle of the reinforced concrete joint section 2 are mutually dispersed, and the capability of preventing the reinforced concrete joint section concrete 204 from cracking is improved.
A longitudinal pre-stressing corrugated pipe 401 is preset in the P-shaped steel box, the pre-stressing steel strand 4 is inserted into the pre-stressing corrugated pipe 401, and the end part is anchored at the outer side of the bearing plate 207 through an anchor 402. The outside steel sheet 205 at the top of the reinforced concrete combination section 2 is connected with the top plate 103 of the steel beam section 1 into a whole, the outside steel sheet 205 at the bottom of the reinforced concrete combination section 2 is connected with the bottom plate 104 of the steel beam section 1 into a whole, and the reinforced concrete combination section 2 can be fixed in a welding mode, and a plate body can also be directly adopted, so that the strength and the stability of the connection between the steel beam section 1 and the reinforced concrete combination section 2 are ensured, the structural strength of a reinforced concrete structural beam is improved, and the construction requirement of a large-span hybrid bridge is met.
The steel plates are all connected in a welding mode. The ends of the T-shaped stiffening ribs 101 are welded and fixed with the bearing plates 23, and the strength of connection between the steel beam section 1 and the reinforced concrete combination section 2 is further improved through the T-shaped stiffening ribs 101.
As shown in fig. 1 and 2, the concrete section 3 is a reinforced concrete structure, a longitudinal prestressed corrugated pipe 401 is preset in the concrete section 3, and the prestressed steel strand 4 is inserted into the prestressed corrugated pipe 401.
The prestress steel strand 4, the prestress corrugated pipe 401 and the anchorage 402 form a prestress system, after the concrete of the reinforced concrete combination section 2 and the concrete section 3 reaches the specified strength, the prestress steel strand 4 is tensioned, the prestress steel strand 4 has higher strength, the vertical load and the horizontal load of the girder can be effectively shared, and the prestress is formed after the prestress steel strand 4 is tensioned, so that the bearing capacity and the stability of the structure are enhanced, the deformation and the cracking of the combination girder are effectively reduced, and the service life of the bridge is prolonged. The pre-stressed corrugated pipe 401 provides a tensioning channel for the tensioning construction of the pre-stressed steel strand 4.
It should be noted that, fig. 1-7 show structures of the fabricated steel-concrete combination beam on one side, and the fabricated steel-concrete combination beam is completely identical and symmetrical when being located on the left side and the right side. The P-shaped structure enables the steel-concrete combined beam to be of a double-sided box structure as shown in fig. 8-10, and the box body is positioned on two sides of the combined beam.
The construction method of the assembled steel-concrete combined beam comprises the following steps:
firstly, welding and fixing the perforated steel plate 201 in the reinforced concrete combination section 2 between an outer steel plate 205 and an inner steel plate 206, welding and fixing the T-shaped stiffening ribs 101 on the top plate 103, the bottom plate 104 and the outer steel plate 102 at intervals, and welding and fixing the other ends of all the T-shaped stiffening ribs 101 and the bearing plate 207; then, the shear nails 209 are welded and fixed on the outer steel plate 205 and the inner steel plate 206, and the penetrating steel bars 203 are penetrated and fixed between the perforated steel plates 201 by means of binding and spot welding; then, the outer steel plate 205, the inner steel plate 206, and the bearing plate 207 are welded, and the inner and outer forms are respectively subjected to the formwork erection.
And then, pouring the concrete section 3 and the reinforced concrete combination section 2 at one time, removing the template after the strength of the concrete reaches more than 75% of the design strength, and curing the formed test piece for more than twenty-eight days.
Before the steel-concrete combined beam is hoisted and constructed, a support is reasonably erected according to calculation, the support position and the support sedimentation are ensured to be within an allowable range, a large-scale floating crane or a beam transporting vehicle is adopted to transport the steel-concrete combined beam in place, the steel-concrete combined beam is hoisted to the support, the hoisting position is reasonably selected to prevent the steel-concrete combined beam from deforming or generating concrete cracks, and then the position of the steel-concrete combined beam is accurately positioned.
Penetrating a prestress steel strand 4 into a prestress corrugated pipe 401 of a P-shaped steel box and a concrete section 3, and installing an anchor 403 of the prestress steel strand 4 in a steel beam section 1;
and tensioning the prestressed steel strand 4 according to the design requirement, grouting the pore canal, and connecting the assembled steel-concrete combined beam with the adjacent beam end through bolt connection or wet joint.
When the wet joint connection is adopted, after the bridge deck plate is installed, binding wet joint steel bars and vertical templates, pouring wet joints in all units in sequence, and finally pouring reserved transverse wet joints, so that the installation construction of the steel-concrete combined beam serving as the bridge deck plate can be completed.
The steel beam section 1, the reinforced concrete combined section 2 and the concrete section 3 which are sequentially connected are used for realizing the assemblable construction of the reinforced concrete combined beam, the structural strength of the reinforced concrete combined beam is improved by arranging the shear components, the stiffening ribs and the like, and the construction use requirements of the large-span hybrid bridge are met.
The foregoing description of the invention has been presented for purposes of illustration and description, and is not intended to be limiting. Several simple deductions, modifications or substitutions may also be made by a person skilled in the art to which the invention pertains, based on the idea of the invention.
Claims (10)
1. Assembled steel-concrete combination beam, its characterized in that:
the cross section of the assembled steel-concrete combined beam is P-shaped and comprises a steel beam section (1), a steel-concrete combined section (2) and a concrete section (3) which are connected in sequence longitudinally;
longitudinal prestressed steel strands (4) are distributed in the steel-concrete combination section (2) and the concrete section (3), and the ends of the prestressed steel strands (4) are anchored in the steel beam section (1).
2. The fabricated steel-concrete composite beam according to claim 1, wherein:
the steel beam section (1) comprises an outer steel plate (102), a top plate (103) and a bottom plate (104);
the top plate (103) and the bottom plate (104) are horizontally arranged in an up-down parallel manner, the transverse inner ends of the top plate (103) and the bottom plate (104) are vertically corresponding, and the transverse width of the top plate (103) is larger than that of the bottom plate (104);
the outer steel plates (102) are longitudinally and vertically arranged between the top plate (103) and the bottom plate (104) and are respectively arranged at two transverse ends of the bottom plate (104).
3. The fabricated steel-concrete composite beam according to claim 2, wherein:
t-shaped stiffening ribs (101) are arranged on the inner side of the outer steel plate (102), the bottom surface of the top plate (103) and the top surface of the bottom plate (104).
4. A fabricated steel-concrete composite beam according to claim 3, wherein:
the steel-concrete combination section (2) comprises an outer steel plate (205), an inner steel plate (206) and a bearing plate (207);
the outer steel plate (205) and the inner steel plate (206) form a P-shaped steel box, and the bearing plates (207) are positioned at the front end and the rear end of the P-shaped steel box in the longitudinal direction;
and steel-concrete joint section concrete (204) is filled in the P-shaped steel box.
5. The fabricated steel-concrete composite beam according to claim 4, wherein:
the steel box is characterized in that a perforated steel plate (201) which is vertically and horizontally arranged is arranged in the P-shaped steel box, the perforated steel plate (201) divides the P-shaped steel box into a plurality of longitudinal cavities, penetrating steel bars (203) are inserted into holes of the perforated steel plate (201), and the penetrating steel bars (203) are arranged along the inner wall of the P-shaped steel box.
6. The fabricated steel-concrete composite beam according to claim 5, wherein:
the inner wall of the P-shaped steel box is provided with a shear connector (202) perpendicular to the inner wall of the P-shaped steel box, and the shear connector (202) comprises PBL steel bars (208) and shear nails (209).
7. The fabricated steel-concrete composite beam according to claim 6, wherein:
longitudinal prestressed corrugated pipes (401) are preset in the P-shaped steel box and the concrete section (3), the prestressed steel strands (4) are inserted into the prestressed corrugated pipes (401), and the end parts are anchored outside the bearing plates (207) through anchors (402).
8. The fabricated steel-concrete composite beam according to claim 7, wherein:
the outer steel plate (205) at the top of the reinforced concrete combination section (2) is connected with the top plate (103) of the steel beam section (1) into a whole;
the outer steel plate (205) at the bottom of the reinforced concrete combination section (2) is connected with the bottom plate (104) of the steel beam section (1) into a whole.
9. The fabricated steel-concrete composite beam according to claim 8, wherein:
the concrete section (3) is a reinforced concrete structure.
10. The method for constructing the fabricated reinforced concrete beam according to claim 9, wherein:
the method comprises the following steps:
penetrating a prestress steel strand (4) into a prestress corrugated pipe (401) of a P-shaped steel box and a concrete section (3), and installing an anchor (403) of the prestress steel strand (4) in the steel beam section (1);
and tensioning the prestressed steel strand (4) according to the design requirement, grouting the pore canal, and connecting the assembled steel-concrete combined beam with the adjacent beam end through bolt connection or wet joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311792032.5A CN117626786A (en) | 2023-12-25 | 2023-12-25 | Prefabricated steel-concrete composite beam and its construction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311792032.5A CN117626786A (en) | 2023-12-25 | 2023-12-25 | Prefabricated steel-concrete composite beam and its construction method |
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| Publication Number | Publication Date |
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| CN117626786A true CN117626786A (en) | 2024-03-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202311792032.5A Pending CN117626786A (en) | 2023-12-25 | 2023-12-25 | Prefabricated steel-concrete composite beam and its construction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119041285A (en) * | 2024-09-26 | 2024-11-29 | 中铁十八局集团有限公司 | Bridge steel-concrete combined section structure with steel shell and application method thereof |
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2023
- 2023-12-25 CN CN202311792032.5A patent/CN117626786A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119041285A (en) * | 2024-09-26 | 2024-11-29 | 中铁十八局集团有限公司 | Bridge steel-concrete combined section structure with steel shell and application method thereof |
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