CN112211089A - Structure for hogging moment area of steel-concrete combined continuous beam bridge - Google Patents
Structure for hogging moment area of steel-concrete combined continuous beam bridge Download PDFInfo
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- CN112211089A CN112211089A CN202011227221.4A CN202011227221A CN112211089A CN 112211089 A CN112211089 A CN 112211089A CN 202011227221 A CN202011227221 A CN 202011227221A CN 112211089 A CN112211089 A CN 112211089A
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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
- E01D19/00—Structural or constructional details of bridges
- E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to 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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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
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Abstract
The invention belongs to the technical field of bridges. A construction for a hogging moment region of a steel-concrete composite continuous beam bridge comprises a first precast main beam and a second precast main beam; notches are formed in the opposite end portions of the first prefabricated main beam and the second prefabricated main beam, so that the notches of the first prefabricated main beam and the second prefabricated main beam are spliced to form a T-shaped seam of a rectangular strip with a serrated edge at the upper portion and a vertical groove body with a serrated edge at the middle lower portion; the first prefabricated main beam and the second prefabricated main beam are both formed by beam bodies formed by welding steel plates, each beam plate comprises an I-shaped steel, a bridge deck and an end partition plate, the top of each I-shaped steel is connected with the bridge deck, each bridge deck is in a step shape, and the end partition plate is welded at the junction of each I-shaped steel and a cast-in-place wet joint.
Description
Technical Field
The invention belongs to the technical field of bridges, and particularly relates to a structure for a hogging moment area of a steel-concrete combined continuous beam bridge.
Background
Under the background that the transportation department puts forward the characteristic performance advantages of steel structure bridges into full use to realize transformation and upgrading of highway structures, the form of the steel-concrete composite structure bridges is widely adopted in provinces and cities in China, and the highway construction is optimized and promoted. The novel building has a quick and convenient construction mode, small building height, light and attractive structure and shape, and has great competitiveness.
For a multi-span bridge, the beam height can be further reduced by adopting the continuous composite beam, and the service performance is better. However, in the hogging moment area of the continuous composite beam, the concrete will bear tensile force, the steel beam will bear pressure, and the limit state of the structure is often controlled by the cracking of the concrete and the buckling of the steel beam in the hogging moment area, which is very disadvantageous for both the steel beam and the concrete. At present, prestress is mostly applied to a concrete bridge deck slab during construction to meet certain stress requirements, but the bridge deck slab in a hogging moment area has more cracks and poor durability, a lower steel beam is easy to bend and destabilize, the construction process is complicated, particularly after the concrete bridge deck slab cracks, the rigidity of a composite beam is reduced, harmful liquid is easy to permeate and corrode reinforcing steel bars, studs and steel beams in the concrete slab, the durability of the bridge is reduced, and the difficulty of maintenance work is increased. Therefore, how to prevent the concrete crack in the hogging moment area or how to effectively control the width of the concrete crack in the hogging moment area is a key problem influencing the design of the continuous composite girder bridge. Aiming at the situation, the invention provides a structural form for solving the unfavorable stress state of a hogging moment area.
The ultra-high performance concrete (UHPC) is also called active powder concrete, is a cement-based composite material which is prepared by fine aggregates such as cement, quartz sand, quartz powder, silica fume, fly ash, steel fiber, high-efficiency water reducing agent and the like according to the maximum compact theory, and has the characteristics of high strength, high toughness, low porosity, high durability and no shrinkage in the later period.
Therefore, the invention aims to solve the problem that the existing hogging moment area of the continuous composite beam is unreasonably stressed, and provides the hogging moment area structure of the steel-concrete composite continuous beam bridge, which meets the stress requirement of the hogging moment area, and has the advantages of simple structure, convenient construction and strong applicability.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects of the existing method for applying prestress on the bridge deck in the hogging moment area, and provides the structure of the hogging moment area of the steel-concrete combined continuous beam bridge, which has novel structure, convenient construction and strong applicability, thereby preventing the concrete joints of the bridge deck in the hogging moment area from cracking and improving the structural durability.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a construction for a hogging moment region of a steel-concrete composite continuous beam bridge comprises a first precast main beam and a second precast main beam; notches are formed in the opposite end portions of the first prefabricated main beam and the second prefabricated main beam, so that the notches of the first prefabricated main beam and the second prefabricated main beam are spliced to form a T-shaped seam of a rectangular strip with a serrated edge at the upper portion and a vertical groove body with a serrated edge at the middle lower portion;
the first prefabricated body girder and the second prefabricated body girder are both composed of girder bodies formed by welding steel plates, each girder plate comprises an I-shaped steel, a bridge deck and an end partition plate, the top of each I-shaped steel is connected with the bridge deck, each bridge deck is in a step shape, the end partition plate is welded at the junction of each I-shaped steel and a cast-in-place wet joint, each I-shaped steel is provided with a web plate, a top plate and a bottom plate, each web plate is vertically connected with the top plate and the corresponding bottom plate to form I-shaped steel, each web plate of each I-shaped steel is provided with a web plate extending section extending inwards the T-shaped joint, each web plate extending section is provided with a stud, and the end part of each top plate of each; the first prefabricated body girder and the second prefabricated body girder are connected through the steel connecting plates in a welded mode.
Further, all pre-buried being provided with the longitudinal reinforcement that extends to in the rectangle strip in first prefabricated body girder and the second prefabricated body girder, the longitudinal reinforcement in the rectangle strip is connected by the overlap joint reinforcing bar still be provided with the transverse reinforcement perpendicularly on the longitudinal reinforcement.
Furthermore, the end part of the first prefabricated body girder and the bridge deck of the second prefabricated body girder are both pre-buried with interface reinforcing steel bars for connecting and binding longitudinal reinforcing steel bars in the rectangular strips.
Furthermore, the end baffle is the end baffle of buckling shape, the end baffle of buckling shape has the slot that sets up along vertical cell body direction and to the pterygoid lamina that the slot both sides extended.
Furthermore, the top plate extending section is a plurality of long straight steel bars arranged at intervals, and the middle top plate extending section is provided with studs.
Furthermore, UHPC concrete is filled in the rectangular strip of the T-shaped joint to form a zigzag edge rectangular UHPC strip, and common concrete or the UHPC concrete and the common concrete are filled in the vertical groove body layer by layer.
Further, in the vertical groove body, a UHPC concrete layer is positioned above a common concrete layer.
Further, the longitudinal bridge length of the rectangular strip is 1/15-1/3 of the calculated span, and the longitudinal bridge length of the vertical groove body is greater than or equal to 90 cm.
Further, the steel connecting plate is arranged above the welding position of the overhanging sections of the bottom plates of the I-shaped steel on the two sides.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the structure for the hogging moment area of the steel-concrete combined continuous beam bridge, the T-shaped seam meets the requirement of connection part casting compactness, when the hogging moment area of the continuous beam bridge bears axial tension, the adhesive force and the extrusion action of the concrete in the overhanging section of the top plate of the I-steel and the seam greatly contribute to the tensile capacity of the section, the tensile capacity of the section is further enhanced, the stress performance of the hogging moment area is improved, and therefore the problems that a bridge deck plate above the hogging moment area of the steel-concrete combined continuous beam bridge has overlarge tension and the bridge deck plate is prone to crack are solved.
(2) According to the structure for the hogging moment area of the steel-concrete combined continuous beam bridge, the serrated grooves are formed in the edges of the prefabricated bridge deck slab, the shape and the number of the serrations can be adjusted according to actual conditions, the serrated grooves can increase the contact area of cast-in-place UHPC and the prefabricated beam, the connection strength of the interface is enhanced, the vertical shear resistance of the joint is further improved, and the integrity of the prefabricated assembly beam is improved.
(3) The structure for the hogging moment area of the steel-concrete combined continuous beam bridge can improve the capability of resisting the hogging moment at the joint, and the longitudinal steel bars are lapped, so that the construction is convenient and quick, and the requirement of quick prefabrication and assembly construction can be met.
(4) According to the structure for the hogging moment area of the steel-concrete combined continuous beam bridge, the cast-in-place layer of the upper ultra-high performance concrete (UHPC) bridge is a rectangular strip, so that enough lap joint length can be provided for the top longitudinal steel bars, the lap joint quality is improved, and the construction is convenient.
(5) Compared with the common concrete, the UHPC cast-in-place structure adopted by the top ultra-high performance concrete (UHPC) layer can greatly enhance the strength, toughness and durability of the hogging moment area and effectively avoid the generation of cracks.
(6) The structure for the hogging moment area of the steel-concrete combined continuous beam bridge can eliminate pier top prestressed bundles, is simple to construct and good in economical efficiency, and can avoid the situation that the hogging moment area is provided with prestress to cause cracks on a bridge deck and buckling of a steel beam.
(7) According to the structure for the hogging moment area of the steel-concrete combined continuous beam bridge, the transverse length of the T-shaped seam, the length of the notch, the number of the studs of the web plate overhanging section and the number of the studs on the base plate overhanging section are adjusted, so that the hogging moment and the shearing force borne by the hogging moment area of the combined beam can be matched conveniently.
(8) According to the structure for the hogging moment area of the steel-concrete combined continuous beam bridge, the arrangement of the bent partition plate at the junction of the I-steel and the transverse joint plays a role in stiffening and bending resistance, the use of templates in construction is reduced, the construction difficulty is reduced, and the construction steps are simplified.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view showing the construction of a hogging moment region in example 1 (steel bar arrangement and wet joint filling are not shown).
FIG. 2 is an exploded view of a portion of the structure of a main beam of the preform.
FIG. 3 is a schematic view showing the construction of the hogging moment region in example 1 (steel bar arrangement and wet joint unfilled are not shown in the figure).
Fig. 4 is a plan view of fig. 3.
Fig. 5 is an elevation view of fig. 3.
Fig. 6 is a schematic view of the seam of fig. 3.
FIG. 7 is a schematic view of the end spacer and the peg thereon.
FIG. 8 is a schematic diagram of concrete filled in a vertical groove body at the middle lower part in the T-shaped joint.
FIG. 9 is a schematic diagram of the arrangement of the reinforcing mesh in the upper rectangular strip on the top of the hogging moment area.
Fig. 10 is a schematic layout view of longitudinal steel bars and lap steel bars in the second-layer prefabricated bridge deck slab at the top of the hogging moment area.
FIG. 11 is a schematic view showing the arrangement of longitudinal steel bars and lap steel bars in the third layer of prefabricated bridge deck slab at the top of the hogging moment area.
Wherein, labeled in the figures: 1-I-steel; 101-a base plate; 102-a web; 103-a top plate; 1001-floor overhang section; 1002-a web overhang section; 1003-roof overhang section; 2-a bridge deck; 3-rectangular strips; 301-rectangular UHPC strip edge convex; 4-vertical trough body; 401-vertical groove body projection; 5-end baffle plate; 6-stud; 7-a steel connecting plate; 8-longitudinal steel bars; 9-lapping reinforcing steel bars; 10-transverse steel bars; 11-interface steel bar.
Detailed Description
The invention is further described with reference to the following figures and examples. It should be noted that the specific embodiments of the present invention are only for clearly describing the technical solutions, and should not be taken as a limitation to the scope of the present invention.
In order to facilitate an understanding of the invention, the invention will be described more fully and in detail below with reference to the accompanying drawings and preferred embodiments, but the scope of the invention is not limited to the specific embodiments below.
It should be particularly noted that when an element is referred to as being "fixed to, connected to or communicated with" another element, it can be directly fixed to, connected to or communicated with the other element or indirectly fixed to, connected to or communicated with the other element through other intermediate connecting components.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
Referring to fig. 1 to 11, a construction for a hogging moment region of a steel-concrete composite continuous girder bridge includes a first precast main girder and a second precast main girder; notches are formed in the opposite end portions of the first and second main prefabricated body beams, so that the notches of the first and second main prefabricated body beams are spliced to form a T-shaped seam of a rectangular strip 3 with a serrated edge at the upper portion and a vertical groove 4 with a serrated edge at the middle and lower portions; UHPC concrete is filled in the rectangular strips 3 of the T-shaped joints to form zigzag-edge rectangular UHPC strips, rectangular UHPC strip edge bulges 301 are arranged on opposite sides of the rectangular strips 3, and common concrete or UHPC concrete and common concrete are filled in the vertical groove bodies 4 layer by layer. And in said vertical trough 4 a layer of UHPC concrete is located above a layer of ordinary concrete. The opposite side of the vertical channel 4 has a vertical channel projection 401.
The first prefabricated body girder and the second prefabricated body girder are both composed of girder bodies formed by welding steel plates, each girder body comprises an I-shaped steel 1, a bridge deck 2 and an end partition plate 5, the top of the I-shaped steel 1 is connected with the bridge deck 2, the bridge deck 2 is in a step shape, the end partition plate 5 is welded at the junction of the I-shaped steel 1 and a cast-in-place wet joint, the I-shaped steel 1 is provided with a web plate 102, a top plate 103 and a bottom plate 101, the web plate 102 is vertically connected with the top plate 103 and the bottom plate 101 to form I-shaped steel, the web plate 102 of the I-shaped steel 1 is provided with a web plate extending section 1002 extending into the T-shaped joint, studs 6 are vertically arranged on the web plate extending section 1002, and the end part of the top plate 103 of the I-shaped steel; the top plate extending section 1003 is formed by a plurality of long straight steel bars arranged at intervals, and the middle top plate extending section 1003 is vertically provided with studs 6. The bottom plate 101 of the I-beam 1 extends into the concrete beam, the end part of the bottom plate 101 of the I-beam 1 is provided with a bottom plate extending section 1001 extending outwards, the bottom plate 101 of the I-beam 1 is vertically provided with a stud 6, and the bottom plates 101 of adjacent I-beams 1 are welded and connected through a steel connecting plate 7, so that the first prefabricated main beam and the second prefabricated main beam are connected through the steel connecting plate 7; the bottom plates 101 of the prefabricated steel-concrete composite beam I-shaped steel 1 on the two sides are welded before system conversion at the continuous pier and are welded with the connecting steel plates, and the steel connecting plates 7 are arranged on the welding positions of the bottom plate extending sections 1001 of the I-shaped steel 1 on the two sides.
According to the structure for the hogging moment area of the steel-concrete combined continuous beam bridge, the T-shaped seam meets the requirement of connection part casting compactness, when the hogging moment area of the continuous beam bridge bears axial tension, the adhesive force and the extrusion action of the top plate extending section 1003 of the I-steel 1 and concrete in the seam greatly contribute to the tensile capacity of the section, the tensile capacity of the section is further enhanced, the stress performance of the hogging moment area is improved, and therefore the problems that the bridge deck 2 above the hogging moment area of the steel-concrete combined continuous beam bridge is prone to overlarge tension and the bridge deck 2 is prone to crack are solved.
All pre-buried being provided with in first prefabricated body girder and the second prefabricated body girder and extending to the longitudinal reinforcement 8 in the rectangular strip 3, the longitudinal reinforcement 8 in the rectangular strip 3 is connected by overlap joint reinforcing bar 9, and reinforcing bar quantity is according to particular case and decide. And transverse steel bars 10 are also vertically arranged on the longitudinal steel bars 8. The end of the first prefabricated body girder and the bridge deck 2 of the second prefabricated body girder are both pre-buried and provided with interface reinforcing steel bars 11 used for connecting longitudinal reinforcing steel bars 8 in the binding rectangular strips 3, and the interface reinforcing steel bars 11 need to be firmly hooked with outermost main reinforcing steel bars.
The end baffle 5 is a bent end baffle 5, and the bent end baffle 5 is provided with a groove arranged along the direction of the vertical groove body 4 and wing plates extending to the two sides of the groove. The wing plates at the two sides extend to the transverse bridge edge of the vertical groove body 4.
The longitudinal bridge length of the rectangular strip 3 is 1/15-1/3 of the calculated span, and the longitudinal bridge length of the vertical groove body 4 is greater than or equal to 90 cm. By adjusting the transverse length of the T-shaped seam, the length of the notch, the number of the studs 6 of the web overhanging section 1002 and the number of the studs 6 of the bottom plate overhanging section 1001, the bending moment and the shearing force borne by the hogging moment area of the combined beam can be matched conveniently.
Example 1:
the invention relates to a structure for a hogging moment area of a steel-concrete combined continuous beam bridge, which is characterized in that a prefabricated steel-concrete combined beam is formed by connecting a lower I-steel 1 and a bridge deck 2 made of upper common concrete through a stud 6, the hogging moment area structure comprises two prefabricated steel-concrete combined beams, notches of a first prefabricated main beam and a second prefabricated main beam are spliced to form a rectangular strip 3 with a serrated edge at the upper part and a cast-in-place wet joint of a vertical groove body 4 with a serrated edge at the middle lower part, and a longitudinal bridge length of a vertical PC layer filled in the upper part of a T-shaped joint is 6m and 0.11 m; the longitudinal bridge length of the lower common concrete layer is 1.2m, and the height is 1.69 m. The end of the first prefabricated body girder and the bridge deck 2 of the second prefabricated body girder are both pre-buried and provided with longitudinal steel bars 8 extending into the T-shaped joint, and interface steel bars 11 used for connecting and binding the longitudinal steel bars 8 in the rectangular UHPC strip with the serrated edge, and the longitudinal steel bars 8 in the T-shaped joint are connected by lap-jointed steel bars 9. As shown in fig. 10, the UHPC layer lapped steel bars 9 in the rectangular strip 3 are single-layer and 20mm in diameter, and the ordinary concrete layer lapped steel bars 9 are double-layer and 25mm in diameter; as shown in fig. 11, the longitudinal steel bars 8 in the bridge deck slab 2 prefabricated in the hogging moment area are 2 layers, the diameter of the longitudinal steel bars is 28mm, the diameter of the longitudinal steel bars is 20mm in addition to the diameter of the longitudinal steel bars 1 layer, the distance between the longitudinal steel bars 8 is 10cm, the longitudinal steel bars 8 in the UHPC layer are bound, and the longitudinal steel bars 8 in the common concrete layer are welded on one side. A bent end partition plate 5 is welded at the junction of the I-steel 1 and the T-shaped joint, studs 6 are arranged on the web plate extending section 1002 of the I-steel 1, a top plate extending section 1003 extending outwards is arranged at the end part of the top plate 103 of the I-steel 1, the bottom plate 101 of the I-steel 1 extends into the concrete beam, and the studs 6 are arranged on the bottom plate 101 of the I-steel 1. The bottom plates 101 of the prefabricated steel-concrete composite beam I-shaped steel 1 on the two sides are welded before system conversion at the continuous pier and are welded with the steel connecting plate 7. The notch is arranged at the upper part of the wet joint to form the rectangular UHPC strip with the serrated edge, so that the collision and the framing during the arrangement of the steel bars are avoided, the steel bars 9 are conveniently lapped, the construction is convenient, in addition, the design of the combined wet joint structural shape of the rectangular UHPC strip with the serrated edge at the upper part and the middle and lower serrated vertical groove bodies 4 enhances the connection strength at the interface, the negative bending moment and shearing force resistance capability of the joint is further improved, and the integrity of the prefabricated assembly beam is improved.
According to the invention, under the condition that the T-shaped seam meets the requirement of casting compactness of the connecting part, when the hogging moment region of the continuous beam bridge bears axial tension, the adhesive force and the extrusion action of the overhanging section 1003 of the top plate of the I-steel 1 and concrete in the seam greatly contribute to the tensile capacity of the section, so that the tensile capacity of the section is further enhanced, the stress performance of the hogging moment region is improved, and the problems that the bridge deck 2 above the hogging moment region of the steel-concrete combined continuous beam bridge has overlarge tension and the bridge deck 2 is easy to crack are solved.
In the invention, the arrangement of the bent end partition plates 5 at the junctions of the I-shaped steel 1 and the transverse joints not only plays a role in stiffening and bending resistance, but also reduces the use of templates in construction, reduces the construction difficulty and simplifies the construction steps.
The construction method for the structure of the hogging moment area of the steel-concrete combined continuous beam bridge comprises the following steps:
s1: prefabricating the prefabricated steel-concrete composite beam, wherein longitudinal steel bars 8 extending into wet joints are pre-embedded in the bridge deck 2 of the first prefabricated main beam and the second prefabricated main beam, and interface steel bars 11 are pre-embedded so as to bind steel bars in rectangular UHPC strips;
s2: accurately positioning two oppositely arranged steel-concrete composite beam prefabricated bodies on a construction site, welding steel structures on two sides, and utilizing lap-joint reinforcing steel bars 9 to lap-joint longitudinal reinforcing steel bars 8 pre-embedded in bridge decks 2 on two sides;
s3: fixedly connecting a bent end clapboard 5 at the end part of the I-shaped steel 1, welding a stud 6 connecting piece at the corresponding position, and erecting a template for forming a T-shaped joint;
s4: and pouring common concrete in the serrated vertical groove bodies 4 at the middle lower parts of the T-shaped joints and rectangular UHPC strips at the serrated edges of the upper layers of the T-shaped joints in batches, and curing to finish the construction process.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A construction for a hogging moment region of a steel-concrete composite continuous beam bridge comprises a first precast main beam and a second precast main beam; the method is characterized in that: notches are formed in the opposite end portions of the first and second main prefabricated body beams, so that the notches of the first and second main prefabricated body beams are spliced to form a T-shaped seam of a rectangular strip (3) with a serrated edge at the upper portion and a vertical groove body (4) with a serrated edge at the middle and lower portion;
the first prefabricated main beam and the second prefabricated main beam are both composed of beam bodies formed by welding steel plates, the beam plate comprises I-shaped steel (1), a bridge deck plate (2) and an end clapboard (5), the top of the I-shaped steel (1) is connected with the bridge deck (2), the bridge deck (2) is in a step shape, the end clapboard (5) is welded at the junction of the I-shaped steel (1) and the cast-in-situ wet joint, the I-shaped steel (1) is provided with a web plate (102), a top plate (103) and a bottom plate (101), the web plate (102) is vertically connected with the top plate (103) and the bottom plate (101) to form an I-shaped steel material, the web (102) of the I-shaped steel (1) is provided with a web extending-out section (1002) extending into the T-shaped joint, a stud (6) is arranged on the web extending-out section (1002), a top plate extending section (1003) extending outwards is arranged at the end part of the top plate (103) of the I-shaped steel (1); the concrete beam is characterized in that a bottom plate (101) of the I-shaped steel (1) extends into the concrete beam, a bottom plate extending section (1001) extending outwards is arranged at the end part of the bottom plate (101) of the I-shaped steel (1), studs (6) are arranged on the bottom plate (101) of the I-shaped steel (1), and the bottom plates (101) of adjacent I-shaped steels (1) are connected through steel connecting plates (7) in a welding mode.
2. The construction for the hogging moment zone of the steel-concrete composite continuous beam bridge as claimed in claim 1, wherein: all pre-buried longitudinal reinforcement (8) that are provided with in extending to rectangle strip (3) in first prefabricated body girder and the second prefabricated body girder, longitudinal reinforcement (8) in rectangle strip (3) are connected by overlap joint reinforcing bar (9), still be provided with transverse reinforcement (10) perpendicularly on longitudinal reinforcement (8).
3. The construction for the hogging moment zone of the steel-concrete composite continuous beam bridge as claimed in claim 1, wherein: the end part of the first prefabricated body girder and the bridge deck (2) of the second prefabricated body girder are both pre-buried with interface reinforcing steel bars (11) used for connecting and binding longitudinal reinforcing steel bars (8) in the rectangular strips (3).
4. The construction for the hogging moment zone of the steel-concrete composite continuous beam bridge as claimed in claim 1, wherein: the end baffle (5) is the end baffle (5) of buckling shape, the end baffle (5) of buckling shape has the slot that sets up along vertical cell body (4) direction and to the pterygoid lamina that the slot both sides extend.
5. The construction for the hogging moment zone of the steel-concrete composite continuous beam bridge as claimed in claim 1, wherein: the roof overhanging section 1003 is formed by a plurality of long straight steel bars arranged at intervals, and the middle roof overhanging section (1003) is provided with studs (6).
6. The construction for the hogging moment zone of the steel-concrete composite continuous beam bridge as claimed in claim 1, wherein: UHPC concrete is filled in the rectangular strips (3) of the T-shaped joints to form rectangular UHPC strips with saw-toothed edges, and common concrete or the UHPC concrete and the common concrete are filled in the vertical groove bodies (4) layer by layer.
7. The construction for the hogging moment zone of the steel-concrete composite continuous beam bridge as claimed in claim 6, wherein: in the vertical groove body (4), the UHPC concrete layer is positioned above the common concrete layer.
8. The construction for the hogging moment zone of the steel-concrete composite continuous beam bridge as claimed in claim 1, wherein: the longitudinal bridge length of the rectangular strip (3) is 1/15-1/3 of the calculated span, and the longitudinal bridge length of the vertical groove body (4) is greater than or equal to 90 cm.
9. The construction for the hogging moment zone of the steel-concrete composite continuous beam bridge as claimed in claim 1, wherein: the steel connecting plate (7) is arranged on the welding position of the bottom plate extending sections (1001) of the I-shaped steels (1) on the two sides.
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| CN202011227221.4A CN112211089A (en) | 2020-11-06 | 2020-11-06 | Structure for hogging moment area of steel-concrete combined continuous beam bridge |
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| CN202011227221.4A CN112211089A (en) | 2020-11-06 | 2020-11-06 | Structure for hogging moment area of steel-concrete combined continuous beam bridge |
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