CN112761068A - T-shaped wet joint structure between prefabricated plates of UHPC bridge floor - Google Patents
T-shaped wet joint structure between prefabricated plates of UHPC bridge floor Download PDFInfo
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- CN112761068A CN112761068A CN202110035882.5A CN202110035882A CN112761068A CN 112761068 A CN112761068 A CN 112761068A CN 202110035882 A CN202110035882 A CN 202110035882A CN 112761068 A CN112761068 A CN 112761068A
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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
- 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
- E01D19/06—Arrangement, construction or bridging of expansion joints
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Abstract
A T-shaped special-shaped wet joint structure between prefabricated plates of a UHPC bridge deck mainly solves the technical problem of complex connection of bridge decks. The key points of the technical scheme are as follows: arranging a seam end with a step-shaped structure on any side of the upper part of the prefabricated bridge deck slab or 2-4 side surfaces, wherein the thickness of the seam end is smaller than that of the middle part of the prefabricated bridge deck slab, and the seam end and the prefabricated bridge deck slab are integrally formed in a one-step cast-in-place mode; be clearance fit between 2 adjacent prefabricated decking of seam, because of the corresponding seam end of 2 adjacent prefabricated decking is the stair structure to form T type spatial structure between the messenger adjacent 2 prefabricated decking, form the cast-in-place seam structure of T type through cast in situ concrete. It is mainly used for manufacturing bridge decks.
Description
Technical Field
The invention relates to a T-shaped special-shaped wet joint structure used between prefabricated plates of UHPC bridge floors.
Background
The bridge deck is used as an important component of a bridge structure, not only bears the direct action of vehicle load, but also provides a working surface for a pavement structure on the bridge deck, and is the most direct member influenced by adverse factors such as overload, corrosion, fatigue and the like, so that the service life of a bridge main body structure and the driving comfort are directly influenced by the working state of the bridge deck. The conventional steel-concrete bridge deck slab combined structure adopts common concrete, and the plate thickness is large due to the low tensile strength of the concrete, the structure self weight is large, the requirement of a large-span bridge main beam is difficult to adapt, and the bridge deck slab combined structure is easy to crack nearby wet joints, hogging moment areas, stay cable anchoring areas and the like, so that the service life of a bridge main body structure and a pavement structure is influenced. The ultra-high performance concrete has the advantages of high elastic modulus, high compression resistance, high tensile strength, good creep property and the like, the structural size can be reduced by adopting the prefabricated ultra-high performance concrete to manufacture the bridge deck, the dead weight of the structure is reduced, the structural load resisting effectiveness is improved, the spanning capacity is increased, and meanwhile, a good working surface is provided for a pavement structure.
At present, the rapid construction technology of prefabricated assembly in the bridge construction field is vigorously researched, developed and applied by the nation and the industry; due to the characteristics of light weight, high strength and the like, the ultra-high performance concrete bridge structure pays attention to the prefabrication and assembly technology and is gradually developed and applied, but in the aspect of ultra-high performance concrete prefabricated bridge decks, no engineering application experience exists at home. Because the ultra-thin components of the ultra-high performance concrete precast slab and the dense reinforcement in the slab bring two problems to the construction of the cast-in-place wet joint. The first problem is the influence of the reserved dense-grade steel bars of the wet joint, and the traditional method has two types: firstly, annular reinforcing steel bars are reserved in the prefabricated plates, and the connection of wet joints is ensured to be effective by connecting the annular reinforcing steel bars reserved in two adjacent prefabricated plates, but the templates of the prefabricated plates are difficult to mount and dismount due to the existence of the annular reinforcing steel bars, and the components are easy to damage during the template dismounting; and secondly, enough long steel bars are reserved in the prefabricated plates, the reserved steel bars are connected into a whole through binding or welding, effective connection of wet joints is ensured, and because the steel bars in the prefabricated plates are dense, the steel bars in adjacent prefabricated plates are easily overlapped and staggered when the prefabricated plates are installed, so that difficulty is brought to installation of the prefabricated plates. The second problem is the problem of the void at the bottom of the reserved steel bar, because the prefabricated plate is ultra-thin, the steel bar at the upper layer is exposed in the tooth socket of the prefabricated plate, when the wet joint ultra-high performance concrete is poured, the bottom of the steel bar is difficult to be dense, so that the weak link of the wet joint structure occurs, and the traditional structure has no corresponding solution.
Disclosure of Invention
The invention aims to provide a T-shaped cast-in-place joint structure which is convenient to install and disassemble a prefabricated bridge deck and strengthens the connection of the prefabricated bridge deck.
The technical scheme adopted by the invention for solving the technical problems is as follows: the method is characterized in that a joint end with a step-shaped special-shaped structure is arranged on any side of the upper part of a prefabricated bridge deck slab or 2-4 side surfaces of the upper part of the prefabricated bridge deck slab, namely the thickness of the joint end is smaller than the thickness of the middle part of the prefabricated bridge deck slab, a tooth space structure is arranged on the joint end, a reinforcing steel bar of the prefabricated bridge deck slab, which extends outwards to the upper layer, in the tooth space structure is partially wrapped, and the tooth space structure, the joint end and the prefabricated bridge deck slab are integrally; be clearance fit between 2 adjacent prefabricated decking of seam, because of the corresponding seam end of 2 adjacent prefabricated decking is the stair structure to form T type spatial structure between the messenger adjacent 2 prefabricated decking, form the cast-in-place seam structure of T type through cast in situ concrete.
According to the invention, two UHPC bridge deck precast slabs with reinforcing steel bars at joint ends in a partially wrapped step structure are lapped on the same steel beam, a gap of 10-60 cm is arranged between the two UHPC bridge deck precast slabs, a steel beam plate is arranged below the gap, and 1-3 rows of vertical studs are welded on the steel beam plate to form a T-shaped special-shaped space structure; a tooth groove structure is arranged at the joint end of the UHPC bridge deck precast slab, a steel bar of an overhanging upper layer of a precast bridge deck in the tooth groove structure is partially wrapped, and the tooth groove structure, the joint end and the precast bridge deck are integrally formed by one-step prefabrication; longitudinal reinforcing steel bars (4) with the same direction as the overhanging steel bars of the UHPC bridge deck precast slab and transverse steel bars in the direction perpendicular to the longitudinal reinforcing steel bars are arranged in the T-shaped special-shaped space, the longitudinal reinforcing steel bars and the overhanging steel bars of the UHPC bridge deck precast slab are arranged in parallel at intervals without any welding, a cast-in-place joint structure is formed by cast-in-place UHPC concrete, and the tensile force meeting the design requirement is transmitted
The internal reinforcing steel bars of the prefabricated bridge deck slab extend out of the joint ends, namely the internal reinforcing steel bars extend out of the joint ends according to design requirements, and therefore the strength of the joints is enhanced when the joints are cast in situ.
The internal reinforcing steel bars of the prefabricated bridge deck comprise more than two upper joint embedded reinforcing steel bars and more than two lower joint embedded reinforcing steel bars, the upper joint embedded reinforcing steel bars and the lower joint embedded reinforcing steel bars extend out of the prefabricated bridge deck 2 to the T-shaped cast-in-place joint 3, the upper joint embedded reinforcing steel bars and the upper joint embedded reinforcing steel bars of two adjacent prefabricated bridge decks 2 correspond to each other, the lower joint embedded reinforcing steel bars and the lower joint embedded reinforcing steel bars correspond to each other, the upper joint embedded reinforcing steel bars and the lower joint embedded reinforcing steel bars extend out of the T-shaped special-shaped space cast-in-place joint, the upper joint embedded reinforcing steel bars of the two adjacent prefabricated bridge decks (2) correspond to each other in position, and the lower joint embedded reinforcing steel bars also correspond to each other in position.
The internal reinforcing steel bars of the prefabricated bridge deck comprise upper joint embedded reinforcing steel bars 211 and lower joint embedded reinforcing steel bars 212, and the upper joint embedded reinforcing steel bars in the prefabricated bridge deck are radially exposed out of the upper reinforcing steel bars at the joint ends, namely are not embedded in the joint ends; the step surface of the joint end is a special-shaped step 21, and the tooth groove structure is arranged on the special-shaped step 21.
The upper seam embedded steel bars arranged in the prefabricated bridge deck slab are radially exposed out of the steel bars at the upper part of the seam end, and the step surface of the seam end is a special-shaped step 21; the upper-layer steel bars arranged in the prefabricated bridge deck are respectively wrapped by the boss structures 23 on the joint ends, namely the upper-layer steel bars are radially exposed on the step surfaces of the joint ends, namely the upper-layer steel bars are not completely embedded in the joint ends, and all the boss structures 23 on the joint ends and the upper parts of the joint ends are formed by one-step pouring with the prefabricated bridge deck through a mold, so that the step surfaces of the joint ends form tooth-groove-shaped structures.
According to the invention, a joint reinforcing steel bar 4 is arranged between two adjacent upper joint embedded steel bars and two corresponding upper joint embedded steel bars or between two lower joint embedded steel bars and two corresponding lower joint embedded steel bars, and the length of the joint reinforcing steel bar 4 is the width of the T-shaped cast-in-place joint 3.
Longitudinal reinforcing steel bars (4) with consistent directions of two adjacent seam embedded overhanging reinforcing steel bars on the upper layer are arranged between the two seam embedded overhanging reinforcing steel bars, and the length of the seam reinforcing steel bars (4) is more than 1mm smaller than the width of a T-shaped special-shaped space
The upper layer joint embedded steel bars 211 and the lower layer joint embedded steel bars 212 extend out of the prefabricated bridge deck by 25-40 cm. The upper joint embedded steel bars 211 and the lower joint embedded steel bars 212 of two adjacent prefabricated bridge decks 2 correspond to each other, and the butt joint gap is not less than 10 mm and not more than 50 mm.
The semi-wrapped special-shaped step 21 is provided with the vertical nail 24, and the exposed height of the vertical nail 24 is not less than 5mm and not more than 40 mm.
The interval between two adjacent prefabricated bridge deck boards 2 is 5-40 cm.
The height of the boss structure 23 wrapping the overhanging upper joint embedded steel bars 211 is 1/3-2/3 of the diameter of the overhanging upper joint embedded steel bars 211, and the width of the boss structure 23 is 1-3 times of the diameter of the overhanging upper joint embedded steel bars 211; the length of the boss structure 23 is the length of the part of the prefabricated bridge deck 2 wrapping the reinforcement profiled step 21.
The upper seam embedded steel bars arranged in the prefabricated bridge deck are partially wrapped by the boss structures 23 on the special-shaped steps 21 at the upper part of the seam end, namely the upper seam embedded steel bars are partially exposed on the step surfaces of the seam end in the radial direction, namely the upper seam embedded steel bars are not completely embedded in the seam end, and all the boss structures 23 at the seam end and the upper part of the seam end are formed by one-time cast-in-place of the prefabricated bridge deck through a mould, so that the step surfaces of the seam end form a longitudinal tooth-groove-shaped structure.
The upper joint embedded steel bars arranged in the prefabricated bridge deck slab are radially exposed out of the steel bars at the upper part of the joint end, and the steel bars are exposed out of the upper part of the joint end;
one third of the optional radial direction is pre-buried in the prefabricated bridge deck slab, two thirds of the optional radial direction is exposed outside the prefabricated bridge deck slab, and the end part of the optional radial direction can be exposed out of the boss structure;
optionally, two thirds of the radial direction of the bridge deck is embedded in the prefabricated bridge deck, one third of the radial direction of the bridge deck is exposed out of the prefabricated bridge deck, and the end part of the radial direction of the bridge deck can be exposed out of the boss structure;
preferably, one half of the radial direction is pre-embedded in the prefabricated bridge deck, the other half of the radial direction is exposed out of the prefabricated bridge deck, and the end part of the radial direction can be exposed out of the boss structure.
The invention has the beneficial effects that:
the cast-in-place joint structure is convenient and fast to construct, simple to operate and capable of efficiently finishing the bridge deck paving work.
Drawings
FIG. 1 is a schematic view of a partial structure of a prefabricated bridge deck according to the present invention;
FIG. 2 is a side view of the present invention;
FIG. 3 is a schematic view of the present invention in a configuration mounted on a main beam;
FIG. 4 is a top view of the present invention;
FIG. 5 is a schematic diagram of a T-shaped cast-in-place seam formed in accordance with the present invention;
FIG. 6 is a schematic structural view of the present invention fully laying a deck;
FIG. 7 is a schematic diagram of one-half pre-embedding of upper seam pre-embedded steel bars of the present invention;
FIG. 8 is a schematic diagram of one third of the embedment of the embedded steel bars of the upper seam of the invention;
fig. 9 is a schematic diagram of two-thirds embedding of the upper seam embedded steel bars of the invention.
In the figure: 1-bridge, 2-prefabricated bridge deck slab, 21-special-shaped step, 211-upper joint embedded steel bar, 212-lower joint embedded steel bar, 3-T type cast-in-place joint, 24-vertical nail, 4-joint reinforcing steel bar, 211 '-upper joint embedded steel bar of adjacent prefabricated bridge deck slab, and 212' -lower joint embedded steel bar of adjacent prefabricated bridge deck slab.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Embodiment 5, referring to fig. 1 to 9, the upper layer joint embedded steel bars and the lower layer joint embedded steel bars of the present invention both extend out of the prefabricated bridge deck to the T-shaped cast-in-place joint, the upper layer joint embedded steel bars and the lower layer joint embedded steel bars of two adjacent prefabricated bridge decks correspond to each other without binding or welding, and the rest is the same as the above embodiments.
Example 6 referring to fig. 1 to 9, the prefabricated bridge deck of the present invention has a tooth groove height of 3 to 7cm and a width of 5 to 20cm at the upper end thereof, and the rest of the above examples are the same.
Example 7 referring to fig. 1 to 9, the distance between two adjacent prefabricated bridge decks according to the present invention is 5-40 cm, and the rest is the same as the above examples.
In embodiment 8, referring to fig. 1 to 9, the upper layer joint embedded steel bars and the lower layer joint embedded steel bars of the present invention extend 25 to 40cm from the prefabricated bridge deck, which is the same as the above embodiments.
Example 10 referring to fig. 1 to 9, the main girder of the present invention includes a T-section steel composite girder, a steel box composite girder, an i-section steel composite girder, or a steel truss composite girder, which is the same as the above-described examples.
Example 11 referring to fig. 1 to 9, the tooth grooves of the prefabricated bridge deck according to the present invention are provided with more than one peg, as in the above-described examples.
Embodiment 12, referring to fig. 1 to 9, a joint reinforcing steel bar is placed in parallel between two adjacent upper layer joint embedded steel bars or two adjacent lower layer joint embedded steel bars in the present invention, the joint reinforcing steel bar is respectively placed between two adjacent upper layer joint embedded steel bars or two adjacent lower layer joint embedded steel bars of the prefabricated bridge deck, the length of the joint reinforcing steel bar is the width of a T-shaped cast-in-place joint, and the rest of the embodiments are the same as the above embodiments.
Embodiment 13, a wet joint structure of T style of calligraphy between UHPC bridge floor precast slab, includes girder steel, the prefabricated bridge deck of polylith UHPC erect on the girder steel, the cast-in-place UHPC that forms at interval between two adjacent UHPC precast slabs. The method is characterized in that: the prefabricated bridge deck comprises a half-wrapped steel bar special-shaped step, a steel beam upper plane, steel beam outward-extending studs, a gap between two adjacent prefabricated bridge decks, prefabricated bridge deck outward-extending upper-layer steel bars, prefabricated bridge deck outward-extending lower-layer steel bars, prefabricated bridge deck half-wrapped special-shaped step upper outward-extending studs, reinforcing steel bars and cast-in-situ UHPC (ultra high performance concrete) to form a T-shaped cast-in-situ joint; the half-wrapped steel bar special-shaped step of the UHPC prefabricated bridge deck is a regular concave-convex step consisting of a plurality of UHPC building blocks, an outward extending upper layer steel bar and outward extending studs, wherein the UHPC building blocks are wrapped by half, and the outward extending upper layer steel bar is wrapped by half. The overhanging upper layer reinforcing steel bars and the overhanging lower layer reinforcing steel bars of two adjacent prefabricated bridge deck plates are butted one by one, the reinforcing steel bars are arranged at two sides in a staggered mode without binding (or welding), and after cast-in-place UHPC is poured, two adjacent prefabricated bridge deck plates are connected into a whole.
Claims (8)
1. The utility model provides a wet seam structure of T word abnormal shape between prefabricated inter-plate of UHPC bridge floor, characterized by: two UHPC bridge deck precast slabs, the joint ends of which are provided with reinforcing steel bars in a partially wrapped step structure, are lapped on the same steel beam, a gap of 10-60 cm is arranged between the two UHPC bridge deck precast slabs, a steel beam plate is arranged below the gap, and 1-3 rows of vertical studs are welded on the steel beam plate to form a T-shaped special-shaped space structure; a tooth groove structure is arranged at the joint end of the UHPC bridge deck precast slab, a steel bar of an overhanging upper layer of a precast bridge deck in the tooth groove structure is partially wrapped, and the tooth groove structure, the joint end and the precast bridge deck are integrally formed by one-step prefabrication; longitudinal reinforcing steel bars (4) with the same direction as the overhanging steel bars of the UHPC bridge deck precast slab and transverse steel bars in the direction perpendicular to the longitudinal reinforcing steel bars are arranged in the T-shaped special-shaped space, the longitudinal reinforcing steel bars and the overhanging steel bars of the UHPC bridge deck precast slab are arranged in parallel at intervals without any welding, a cast-in-situ joint structure is formed by cast-in-situ UHPC concrete, and the tensile force meeting the design requirement is transmitted.
2. The wet joint structure of T-shaped between prefabricated panels of UHPC bridge floor according to claim 1, characterized in that: the interior reinforcing bar of establishing of prefabricated decking includes the upper joint embedded bar more than two and the lower floor joint embedded bar more than two, and upper joint embedded bar and lower floor joint embedded bar all stretch out to the cast-in-place seam in T word heterotypic space, and the upper joint embedded bar position of two adjacent prefabricated decking (2) corresponds each other, and lower floor joint embedded bar position also corresponds each other.
3. The wet joint structure of T-shaped between prefabricated panels of UHPC bridge floor according to claim 1, characterized in that: the upper seam embedded steel bars arranged in the prefabricated bridge deck are radially exposed out of the steel bars at the upper part of the seam end, the step surface of the seam end is a special-shaped step (21), and the tooth socket structure is arranged on the special-shaped step (21); the upper-layer steel bars arranged in the prefabricated bridge deck are partially wrapped by the boss structures (23) on the joint ends, namely the upper-layer steel bars are radially exposed on the step surfaces of the joint ends, namely the upper-layer steel bars are not completely embedded in the joint ends, and all the boss structures (23) on the joint ends and the upper parts of the joint ends are formed by one-step pouring with the prefabricated bridge deck through a mold, so that the step surfaces of the joint ends form tooth-groove-shaped structures.
4. The wet joint structure of T-shaped between prefabricated panels of UHPC bridge floor according to claim 1, characterized in that: two adjacent longitudinal reinforcing steel bars (4) with consistent joint embedded overhanging reinforcing steel bars in the upper layer are arranged between the two adjacent joint embedded overhanging reinforcing steel bars, and the length of each joint reinforcing steel bar (4) is smaller than the width of the T-shaped special-shaped space by more than 1 mm.
5. The wet joint structure of T style of calligraphy between UHPC bridge floor precast slab of claim 4 characterized by that: prefabricated decking (2) 5 ~ 40cm are all stretched out in upper joint embedded steel bar (211) and lower floor joint embedded steel bar (212), and upper joint embedded steel bar (211) and lower floor joint embedded steel bar (212) of two adjacent prefabricated decking (2) correspond each other, and the butt joint clearance is not less than 10 mm, is not more than 50 mm.
6. The wet joint structure of T style of calligraphy between UHPC bridge floor precast slab of claim 3 characterized by: the semi-wrapped special-shaped step (21) is provided with a vertical nail (24), and the exposed height of the vertical nail (24) is not less than 5mm and not more than 40 mm.
7. The wet joint structure of T style of calligraphy between UHPC bridge floor precast slab of claim 1 characterized by: the interval between two adjacent prefabricated bridge deck boards (2) is 5-40 cm.
8. The wet joint structure of T style of calligraphy between UHPC bridge floor precast slab of claim 1 characterized by: the height of the boss structure (23) wrapping the overhanging upper joint embedded steel bars (211) is 1/3-2/3 of the diameter of the overhanging upper joint embedded steel bars (211), and the width of the boss structure (23) is 1-3 times of the diameter of the overhanging upper joint embedded steel bars (211); the length of the boss structure (23) is the length of the part of the prefabricated bridge deck (2) wrapping the steel bar special-shaped step (21).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110035882.5A CN112761068A (en) | 2021-01-12 | 2021-01-12 | T-shaped wet joint structure between prefabricated plates of UHPC bridge floor |
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| CN202110035882.5A CN112761068A (en) | 2021-01-12 | 2021-01-12 | T-shaped wet joint structure between prefabricated plates of UHPC bridge floor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113605217A (en) * | 2021-07-08 | 2021-11-05 | 同信生态环境科技有限公司 | Structure of bridge abutment and roadbed joint and construction method |
| CN114108452A (en) * | 2021-12-31 | 2022-03-01 | 福州大学 | Folding embedded type bridge floor continuous telescopic device and construction method thereof |
| CN114319065A (en) * | 2022-01-18 | 2022-04-12 | 湖南大学 | Main beam unit with UHPC (ultra high performance polycarbonate) formwork structure, main beam structure and construction method of main beam structure |
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2021
- 2021-01-12 CN CN202110035882.5A patent/CN112761068A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113605217A (en) * | 2021-07-08 | 2021-11-05 | 同信生态环境科技有限公司 | Structure of bridge abutment and roadbed joint and construction method |
| CN114108452A (en) * | 2021-12-31 | 2022-03-01 | 福州大学 | Folding embedded type bridge floor continuous telescopic device and construction method thereof |
| CN114108452B (en) * | 2021-12-31 | 2024-03-08 | 福州大学 | Folding type embedded bridge deck continuous expansion device and construction method thereof |
| CN114319065A (en) * | 2022-01-18 | 2022-04-12 | 湖南大学 | Main beam unit with UHPC (ultra high performance polycarbonate) formwork structure, main beam structure and construction method of main beam structure |
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