CN114635345A - Cell-free steel-concrete combined section structure based on UHPC and construction method thereof - Google Patents
Cell-free steel-concrete combined section structure based on UHPC and construction method thereof Download PDFInfo
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- CN114635345A CN114635345A CN202210142989.4A CN202210142989A CN114635345A CN 114635345 A CN114635345 A CN 114635345A CN 202210142989 A CN202210142989 A CN 202210142989A CN 114635345 A CN114635345 A CN 114635345A
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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
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
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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
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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
- E01D2101/30—Metal
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Abstract
The invention provides a cell-free steel-concrete combined section structure based on UHPC, which comprises a concrete box girder transition section, a steel-concrete combined section and a steel box girder transition section which are sequentially arranged; the steel-concrete combined section comprises a steel box structure and a UHPC structure poured in the steel box structure, the steel box structure comprises a mixed section top plate, a mixed section bottom plate, a mixed section web plate, mixed section flange plates and a steel bearing plate, the steel-concrete combined section is arranged between the steel box beam transition sections and fixedly connected with the steel box beam transition sections, the mixed section web plate is a double-arm plate, and a plurality of rows of first shear nail connecting pieces are arranged on the mixed section top plate, the mixed section bottom plate, the mixed section web plate and the side walls of the steel bearing plate. The cell-free steel-concrete combined section structure based on the UHPC has the characteristics of simple structure, clear force transmission, good connecting effect, simple and convenient construction and the like. The invention also provides a construction method of the cell-free steel-concrete combined section structure based on the UHPC.
Description
Technical Field
The invention relates to the technical field of bridge engineering, in particular to a cell-free steel-concrete combined section structure based on UHPC and a construction method thereof.
Background
The prestressed concrete continuous beam bridge has the advantages that the dead weight of the structure is too large, the shrinkage and creep of common concrete are large, and the beam body can be excessively bent downwards under the long-term action of load, so that the dead weight of the structure can be reduced by adopting the steel box girder in the bridge span, and the problems of main span downward bending of the long-span continuous beam and beam body cracking are solved. The steel-concrete combined section is a transition section between a steel beam and a concrete beam, and because the rigidity and the mass of the steel beam and the concrete beam on two sides are greatly different, the rigidity and the strength are mutated at the moment, the stress is complex, two materials are connected by using a shear force key usually, and measures are taken to weaken the difference of the two materials. The steel-concrete combined section is roughly divided into a steel-concrete combined section without a steel grid chamber and a steel-concrete combined section with the steel grid chamber. It is bigger to have check room steel-concrete to combine section steel-concrete area of contact to be bigger, and internal force transmission is more smooth-going between girder steel and concrete beam, and the wholeness is better, but correspondingly, the setting up of steel check room can make steel-concrete combine section inner space narrow and small, is difficult to guarantee steel construction welding quality and the inside concrete placement compactness of check room, and narrow and small inside PBL connecting piece, peg, the reinforcing bar of being covered with of structure simultaneously, the structure is too complicated. In addition, the common concrete filled in the grid chamber has large drying shrinkage due to poor volume stability, the bonding strength with the steel plate is not high, the gap is very easy to appear between the steel top plate of the combining section and the concrete, and the upper rainwater permeates the grid chamber through the cracks of the pavement layer, so that the durability of the combining section is seriously influenced, and even the structural stress is endangered.
Based on this, a new steel-concrete joint section structure is needed to simplify the structure and solve the above technical problems.
Disclosure of Invention
The invention aims to solve the technical problem of providing a cell-free steel-concrete combined section structure based on UHPC (ultra high performance polycarbonate), which has the characteristics of simple structure, clear force transmission, good connecting effect, simple and convenient construction and the like.
In order to solve the problems, the technical scheme of the invention is as follows:
a cell-free steel-concrete combined section structure based on UHPC comprises a concrete box girder transition section, a steel-concrete combined section and a steel box girder transition section which are sequentially arranged;
the steel-concrete combined section comprises a steel box structure and a UHPC structure poured in the steel box structure, the steel box structure comprises a mixed section top plate formed by extending a top plate of a steel box girder transition section, a mixed section bottom plate formed by extending a bottom plate of the steel box girder transition section, a mixed section web plate formed by extending a web plate of the steel box girder transition section, a mixed section flange plate formed by extending a flange plate of the steel box girder transition section, and a steel bearing plate which is arranged between the steel-concrete combined section and the steel box girder transition section and fixedly connected with the steel box girder transition section, the mixed section web plate is a double-arm plate, and the mixed section top plate, the mixed section bottom plate, the mixed section web plate and the mixed section flange plate are respectively connected with the steel bearing plate;
the mixed section top plate, the mixed section flange plate, the steel bearing plate and the template used in pouring are enclosed to form an upper pouring cavity, the mixed section bottom plate, the steel bearing plate and the template used in pouring are enclosed to form a lower pouring cavity, the mixed section web plate, the mixed section top plate and the mixed section bottom plate are enclosed to form an abdomen pouring cavity, and UHPC is cast in situ in the upper pouring cavity, the lower pouring cavity and the abdomen pouring cavity to form the UHPC structure; and a plurality of rows of first shear nail connecting pieces are arranged on the side walls of the mixing section top plate, the mixing section bottom plate, the mixing section web plate and the steel bearing plate which are positioned in the upper layer pouring cavity, the lower layer pouring cavity and the abdomen pouring cavity and correspond to each other;
the concrete box girder transition section and the UHPC structure are connected into a whole through a reserved steel bar, longitudinal internal stress beams are distributed in the concrete box girder transition section, and the longitudinal internal stress beams penetrate through the UHPC structure of the steel-concrete combined section and are anchored on the steel bearing plate.
Further, the length of the steel-concrete combined section is 1.5-3m, the distance between the double-arm plates is 0.8-1.2m, the height of the upper-layer pouring cavity is 0.8-1.5m, the height of the lower-layer pouring cavity is 0.8-1.5m, and the thickness of the steel pressure-bearing plate is 50-120 mm.
Furthermore, a concrete partition plate with a manhole is arranged in the transition section of the concrete box girder, the concrete partition plate and the UHPC structure are connected into a whole through reserved steel bars, and the reserved steel bars are distributed in parallel along the bridge direction and the transverse bridge direction.
Further, the steel box structure still include with steel bearing plate is connected and one end stretches into a plurality of longitudinal baffle in the concrete baffle, the longitudinal baffle surface is equipped with the second shear force nail connecting piece in the embedding concrete baffle.
Furthermore, the thickness of the concrete partition plate is 0.5-2m, and the depth of the longitudinal partition plate extending into the concrete partition plate is 50-100 cm.
Further, the steel pressure bearing plate is a straight steel plate.
Furthermore, a plurality of T ribs are arranged in the transition section of the steel box girder, one end of each T rib is fixedly connected with the steel bearing plate, and the other end of each T rib is fixedly connected with the steel girder stiffening rib.
Furthermore, the height of the T-shaped rib is gradually reduced from one end of the connecting steel pressure bearing plate to one end of the connecting steel beam stiffening rib, the slope ratio of the T-shaped rib is 1/8-1/10, and the height of one end of the T-shaped rib connecting steel pressure bearing plate and a row of first shear nail connecting pieces, far away from the corresponding mixing section top plate/mixing section bottom plate, in the UHPC structure are on the same horizontal line.
Furthermore, an STC layer with the thickness of 30-60mm is arranged on the top surfaces of the steel-concrete combined section and the steel box girder transition section, and comprises a third shear nail welded on the top surfaces of the steel-concrete combined section and the steel box girder transition section, a steel bar mesh laid on the top surfaces of the steel-concrete combined section and the steel box girder transition section, and an UHPC layer poured on the steel bar mesh.
The invention also provides a construction method of the cell-free steel-concrete combined section structure based on the UHPC, which comprises the following steps:
step S1, manufacturing a steel-concrete combined section steel box structure, and welding a first shear pin connecting piece inside the steel-concrete combined section steel box structure;
step S2, the steel box structure of the hoisting steel-concrete combined section is butted and fixed with the transition section of the concrete box girder, and a prestressed duct of the steel-concrete combined section is installed;
step S3, installing templates of an upper layer pouring cavity and a lower layer pouring cavity of the steel-concrete combined section, and pouring UHPC (ultra high performance concrete) on the upper layer pouring cavity, the lower layer pouring cavity and the abdomen pouring cavity to form a steel-concrete combined section UHPC structure;
and step S4, curing the UHPC of the steel-concrete combined section.
Compared with the prior art, the cell-free steel-concrete combined section structure based on UHPC and the construction method thereof have the advantages that:
the lattice-free steel-concrete combined section structure based on the UHPC provided by the invention has the advantages that the steel lattice structure is eliminated, the number of shear connectors is reduced, the structure is greatly simplified, and the structure is simple and convenient to manufacture; the concrete beam is easy to be reinforced and poured.
The UHPC-based cell-free steel-concrete combined section structure provided by the invention adopts the UHPC material to be connected with the concrete girder, and the mechanical property of the UHPC is between that of concrete and steel, so that the rigidity transition is facilitated, and the structure is well stressed; meanwhile, the UHPC has good fluidity and small aggregate particle size, and is easy to pour and construct; the contraction is small, and the combination between the steel grating chamber and the concrete can be effectively ensured; high rigidity, toughness and fatigue strength.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a structure of a UHPC-based cell-free steel-concrete junction according to the invention;
FIG. 2 is a schematic structural diagram of a steel box of a steel-concrete composite section in the structure of the UHPC-based cell-free steel-concrete composite section shown in FIG. 1;
FIG. 3 is a schematic cross-sectional view of 1/2 at A-A of FIG. 1;
FIG. 4 is a schematic cross-sectional view of 1/2 at B-B of FIG. 1;
FIG. 5 is a schematic top plan view 1/2 of a steel-concrete composite segment in a UHPC-based cell-free steel-concrete composite segment structure according to the present invention;
fig. 6 is a schematic 1/2 bottom plan view of a steel-concrete segment in a structure of a UHPC-based cellular-free steel-concrete segment according to the present invention.
Detailed Description
The following description of the present invention is provided to enable those skilled in the art to better understand the technical solutions in the embodiments of the present invention and to make the above objects, features and advantages of the present invention more comprehensible.
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For numerical ranges, combinations of values between the endpoints of each of the ranges, between the endpoints of each of the ranges and individual values, and between individual values can result in one or more new numerical ranges, and such numerical ranges should be considered as being specifically disclosed herein.
Referring to fig. 1 to 6, fig. 1 is a schematic structural diagram of a UHPC-based cellular steel-concrete junction structure according to the present invention; FIG. 2 is a schematic structural diagram of a steel box of a steel-concrete composite section in the structure of the UHPC-based cell-free steel-concrete composite section shown in FIG. 1; FIG. 3 is a schematic cross-sectional view of 1/2 at A-A of FIG. 1; FIG. 4 is a schematic cross-sectional view of 1/2 at B-B of FIG. 1; FIG. 5 is a schematic top plan view 1/2 of a steel-concrete composite section in a UHPC-based cell-free steel-concrete composite section structure according to the present invention; fig. 6 is a schematic view of the 1/2 bottom plan of the steel-concrete segment in the structure of the UHPC-based cellular-free steel-concrete segment of the present invention. The cell-free steel-concrete combined section structure based on UHPC comprises a concrete box girder transition section 1, a steel-concrete combined section 2 and a steel box girder transition section 3 which are sequentially arranged, wherein the steel-concrete combined section 2 is used for connecting the concrete box girder transition section 1 with the steel box girder transition section 3.
The steel-concrete joint section 2 comprises a steel box structure 21 and a UHPC structure 22 poured in the steel box structure 21. The steel box structure 21 includes a mixed section top plate 211 formed by extending a top plate of the steel box girder transition section, a mixed section bottom plate 212 formed by extending a bottom plate of the steel box girder transition section, a mixed section web 213 formed by extending a web of the steel box girder transition section, a mixed section flange plate 214 formed by extending a flange plate of the steel box girder transition section, and a steel bearing plate 215 disposed between the steel-concrete combining section 2 and the steel box girder transition section 3 and fixedly connected with the steel box girder transition section, the mixed section web 213 is a double-arm plate, and the mixed section top plate 211, the mixed section bottom plate 212, the mixed section web 213, and the mixed section flange plate 214 are respectively connected with the steel bearing plate 215.
The mixed section top plate 211, the mixed section flange plate 214, the steel bearing plate 215 and the template 4 used in pouring are enclosed to form an upper pouring cavity 216, the mixed section bottom plate 212, the steel bearing plate 215 and the template 4 used in pouring are enclosed to form a lower pouring cavity 217, the mixed section web plate 213, the mixed section top plate 211 and the mixed section bottom plate 212 are enclosed to form an abdomen pouring cavity 218, and UHPC is cast in place in the upper pouring cavity 216, the lower pouring cavity 217 and the abdomen pouring cavity 218 to form the UHPC structure 22; and the mixed section top plate, the mixed section bottom plate, the mixed section web plate and the steel bearing plate side wall which are positioned in the upper layer pouring cavity 216, the lower layer pouring cavity 217 and the abdomen pouring cavity 218 and correspond to each other are respectively provided with a plurality of rows of first shear nail connecting pieces 219, and the first shear nail connecting pieces 219 are used for increasing the bonding force between the UHPC structure and the steel box structure.
In this embodiment, the length of the steel-concrete combined section 2 is 1.5-3m, the distance between the double-arm plates is 0.8-1.2m, the height of the upper-layer pouring cavity 216 is 0.8-1.5m, the height of the lower-layer pouring cavity 217 is 0.8-1.5m, and the steel pressure plate 218 is a flat steel plate with a thickness of 50-120 mm.
The transition section 1 of the concrete box girder and the UHPC structure in the steel-concrete combined section 2 are connected into a whole through reserved steel bars. Specifically, a concrete partition plate 11 with a manhole is arranged in the concrete box girder transition section 1, and the concrete partition plate 11 and the UHPC structure are connected into a whole through reserved steel bars. Preferably, the reserved steel bars are distributed in parallel along the bridge direction and the transverse bridge direction, so that the UHPC and the transition section of the concrete box girder are stressed together. In this embodiment, the thickness of the concrete spacer 11 is 0.5 to 2 m.
In order to ensure the good combination of the steel-concrete combination section 2 and the concrete box girder transition section 1, longitudinal internal prestressed tendons 12 and external prestressed tendons 13 are distributed in the concrete box girder transition section 1, the longitudinal internal prestressed tendons 12 penetrate through a UHPC structure 22 of the steel-concrete combination section and are anchored on a steel bearing plate 215, and the external prestressed tendons 13 penetrate through a main span from a main pier diaphragm and are anchored on a main pier diaphragm on the other side.
In order to further improve the good combination of the steel-concrete combination section 2 and the concrete box girder transition section 1, preferably, the steel-concrete combination section 2 further comprises a plurality of longitudinal partition plates 210 which are connected with the steel pressure bearing plates 215 and one ends of which extend into the concrete partition plates 11, and the surfaces of the longitudinal partition plates 210 are provided with second shear nail connecting pieces 2101 embedded in the concrete partition plates. In this embodiment, the depth of the longitudinal partition 210 extending into the concrete partition 11 is 50-100 cm.
Be equipped with girder steel stiffening rib 31 and a plurality of piece T rib 32 in the steel case roof beam changeover portion 3, wherein the one end and the steel bearing plate 215 fixed connection of T rib 32, the other end and girder steel stiffening rib 31 fixed connection. In this embodiment, the height of the T-rib 32 is gradually reduced from the end connected with the steel pressure bearing plate 215 to the end connected with the steel beam stiffener 31 to realize rigidity transition, the slope ratio is 1/8-1/10, and the height of the end connected with the steel pressure bearing plate 215 of the T-rib 32 is in the same horizontal line with the row of first shear pin connectors 219 of the UHPC structure far away from the corresponding top plate/bottom plate of the mixing section.
According to the invention, an STC layer 5 with the thickness of 30-60mm is arranged on the top surfaces of the steel-concrete combining section 2 and the steel box girder transition section 3, the STC layer represents steel-ultra-high-toughness concrete, and the STC layer 5 specifically comprises a third shear nail 51 welded on the top surfaces of the steel-concrete combining section and the steel box girder transition section, a steel bar mesh (not numbered) laid on the top surfaces of the steel-concrete combining section and the steel box girder transition section, and an UHPC layer (not numbered) poured on the steel bar mesh. The STC layer covers the top surfaces of the concrete box girder transition sections with longitudinal prestress of the combining sections except for the top surfaces of the steel-concrete combining sections 2 and the steel box girder transition sections 3.
The invention relates to a UHPC-based cell-free steel-concrete combined section structure, which comprises the following steps:
step S1, manufacturing a steel-concrete combined section steel box structure, and welding a first shear pin connecting piece inside the steel-concrete combined section steel box structure;
step S2, the steel box structure of the hoisting steel-concrete combined section is butted and fixed with the transition section of the concrete box girder, and a prestressed duct of the steel-concrete combined section is installed;
step S3, installing templates of an upper layer pouring cavity and a lower layer pouring cavity of the steel-concrete combined section, and pouring UHPC (ultra high performance concrete) on the upper layer pouring cavity, the lower layer pouring cavity and the abdomen pouring cavity to form a steel-concrete combined section UHPC structure;
the UHPC structure of the upper-layer pouring cavity and the UHPC structure of the abdomen pouring cavity are poured through pouring holes 2110 formed in the top plate 211 of the combining section, and the UHPC structure of the lower-layer pouring cavity is poured through pouring holes formed in the template 4.
And step S4, curing the UHPC of the steel-concrete combined segment.
Compared with the prior art, the cell-free steel-concrete combined section structure based on UHPC and the construction method thereof have the advantages that:
the lattice-free steel-concrete combined section structure based on the UHPC provided by the invention has the advantages that the steel lattice structure is eliminated, the number of shear connectors is reduced, the structure is greatly simplified, and the structure is simple and convenient to manufacture; the concrete beam is easy to be reinforced and poured.
The UHPC-based cell-free steel-concrete combined section structure provided by the invention adopts the UHPC material to be connected with the concrete girder, and the mechanical property of the UHPC is between that of concrete and steel, so that the rigidity transition is facilitated, and the structure is well stressed; meanwhile, the UHPC has good fluidity and small aggregate particle size, and is easy to pour and construct; the contraction is small, and the combination between the steel grid chamber and the concrete can be effectively ensured; high rigidity, toughness and fatigue strength.
The embodiments of the present invention have been described in detail, but the present invention is not limited to the described embodiments. It will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, and these embodiments are therefore considered to be within the scope of the invention.
Claims (10)
1. A cell-free steel-concrete combined section structure based on UHPC is characterized by comprising a concrete box girder transition section, a steel-concrete combined section and a steel box girder transition section which are sequentially arranged;
the steel-concrete combined section comprises a steel box structure and a UHPC structure poured in the steel box structure, the steel box structure comprises a mixed section top plate formed by extending a top plate of a steel box girder transition section, a mixed section bottom plate formed by extending a bottom plate of the steel box girder transition section, a mixed section web plate formed by extending a web plate of the steel box girder transition section, a mixed section flange plate formed by extending a flange plate of the steel box girder transition section, and a steel bearing plate which is arranged between the steel-concrete combined section and the steel box girder transition section and fixedly connected with the steel box girder transition section, the mixed section web plate is a double-arm plate, and the mixed section top plate, the mixed section bottom plate, the mixed section web plate and the mixed section flange plate are respectively connected with the steel bearing plate;
the mixed section top plate, the mixed section flange plate, the steel bearing plate and the template used in pouring are enclosed to form an upper pouring cavity, the mixed section bottom plate, the steel bearing plate and the template used in pouring are enclosed to form a lower pouring cavity, the mixed section web plate, the mixed section top plate and the mixed section bottom plate are enclosed to form an abdomen pouring cavity, and UHPC is cast in situ in the upper pouring cavity, the lower pouring cavity and the abdomen pouring cavity to form the UHPC structure; and a plurality of rows of first shear nail connecting pieces are arranged on the corresponding mixed section top plate, mixed section bottom plate, mixed section web plate and steel bearing plate side wall in the upper layer pouring cavity, the lower layer pouring cavity and the abdomen pouring cavity;
the concrete box girder transition section and the UHPC structure are connected into a whole through the reserved steel bars, and longitudinal internal stress beams are distributed in the concrete box girder transition section and pass through the UHPC structure of the steel-concrete combined section to be anchored on the steel bearing plate.
2. The structure of the UHPC-based cell-free steel-concrete combined section as recited in claim 1, wherein the length of the steel-concrete combined section is 1.5-3m, the distance between the double-arm plates is 0.8-1.2m, the height of the upper-layer casting cavity is 0.8-1.5m, the height of the lower-layer casting cavity is 0.8-1.5m, and the thickness of the steel bearing plate is 50-120 mm.
3. The UHPC-based cellular-free steel-concrete combined section structure is characterized in that a concrete partition plate with a manhole is arranged in the concrete box girder transition section, the concrete partition plate and the UHPC structure are connected into a whole through reserved steel bars, and the reserved steel bars are distributed in parallel along the forward bridge direction and the transverse bridge direction.
4. The UHPC-based cellular-free steel-concrete composite section structure according to claim 3, wherein the steel box structure further comprises a plurality of longitudinal partition plates connected with the steel bearing plates and having one ends extending into the concrete partition plates, and the surfaces of the longitudinal partition plates are provided with second shear nail connectors embedded in the concrete partition plates.
5. A UHPC-based cellular-free steel-concrete bonded section structure according to claim 4 wherein the concrete partition has a thickness of 0.5-2m and the depth of the longitudinal partition extending into the concrete partition is 50-100 cm.
6. The UHPC-based cellular-free steel-concrete composite structure according to claim 1, wherein the steel bearing plate is a flat steel plate.
7. The UHPC-based cellular-free steel-concrete combined section structure as claimed in claim 1, wherein a plurality of T-shaped ribs are arranged in the steel box girder transition section, one ends of the T-shaped ribs are fixedly connected with the steel bearing plate, and the other ends of the T-shaped ribs are fixedly connected with the steel girder stiffening ribs.
8. A UHPC-based cellular-steel-concrete bonded section structure as claimed in claim 7 wherein the T-rib height gradually decreases from the end of the connecting steel pressure-bearing plate to the end of the connecting steel beam stiffener, with a ramp ratio of 1/8-1/10, and the height of the end of the T-rib connecting steel pressure-bearing plate is at the same level as the row of first shear pin connections in the UHPC structure away from the corresponding top/bottom plate of the hybrid section.
9. A UHPC-based cellular-free reinforced concrete composite block structure according to claim 1 wherein the top surfaces of the reinforced concrete composite block and the steel box girder transition block are provided with an STC layer having a thickness of 30-60mm, the STC layer comprises a third shear pin welded to the top surfaces of the reinforced concrete composite block and the steel box girder transition block, a steel bar net laid on the top surfaces of the reinforced concrete composite block and the steel box girder transition block, and a UHPC layer poured on the steel bar net.
10. A construction method of a UHPC based cellular-free steel-concrete joint section structure according to any of claims 1 to 9, characterized by comprising the steps of:
step S1, manufacturing a steel-concrete combined section steel box structure, and welding a first shear pin connecting piece inside the steel-concrete combined section steel box structure;
step S2, hoisting a steel box structure of the steel-concrete combined section and a transition section of the concrete box girder, butting and fixing, and installing a prestressed duct of the steel-concrete combined section;
step S3, installing templates of an upper layer pouring cavity and a lower layer pouring cavity of the steel-concrete combined section, and pouring UHPC (ultra high performance concrete) on the upper layer pouring cavity, the lower layer pouring cavity and the abdomen pouring cavity to form a steel-concrete combined section UHPC structure;
and step S4, curing the UHPC of the steel-concrete combined section.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210142989.4A CN114635345A (en) | 2022-02-16 | 2022-02-16 | Cell-free steel-concrete combined section structure based on UHPC and construction method thereof |
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| CN202210142989.4A CN114635345A (en) | 2022-02-16 | 2022-02-16 | Cell-free steel-concrete combined section structure based on UHPC and construction method thereof |
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| CN109235266A (en) * | 2018-09-26 | 2019-01-18 | 湖南大学 | A kind of construction method of toughened internal stress |
| CN110965457A (en) * | 2019-12-25 | 2020-04-07 | 西南交通大学 | Steel case hybrid beam short bonding section structure of high-speed railway large-span |
| CN211973156U (en) * | 2020-03-02 | 2020-11-20 | 天津市交通科学研究院 | Comprehensive reinforcing structure for top plate void of steel-concrete combined section of steel-concrete combined beam bridge |
| CN215210455U (en) * | 2021-06-03 | 2021-12-17 | 湖南大学 | Steel-free lattice connecting system of steel-concrete mixed beam |
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Application publication date: 20220617 |