CN213508105U - Reinforced structure for improving bending resistance bearing capacity of hollow slab for small-span bridge - Google Patents
Reinforced structure for improving bending resistance bearing capacity of hollow slab for small-span bridge Download PDFInfo
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- CN213508105U CN213508105U CN202022305671.2U CN202022305671U CN213508105U CN 213508105 U CN213508105 U CN 213508105U CN 202022305671 U CN202022305671 U CN 202022305671U CN 213508105 U CN213508105 U CN 213508105U
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Abstract
A reinforced structure for improving the bending resistance bearing capacity of a hollow slab for a small-span bridge is characterized in that semicircular beam bottom reserved grooves which are transversely arranged at intervals are formed in the bottom surface of the hollow slab, and plug plate holes which are vertically arranged and are connected with the beam bottom reserved grooves are formed in plug plates at the end part of the hollow slab; reinforcing steel bars are arranged in the beam bottom preformed groove and the plug plate hole; and an ultrahigh-performance concrete layer is poured at the bottom of the hollow slab. The reinforcing structure can greatly improve the bending resistance bearing capacity of the hollow slab by additionally arranging the reinforcing steel bars on the bottom surface of the hollow slab; the ultra-high performance concrete layer additionally arranged at the bottom of the hollow slab can combine the hollow slab, the reinforcing steel bars and the ultra-high performance concrete layer together, so that the bending resistance bearing capacity, the rigidity and the durability of the hollow slab are further improved; the crack generated on the bottom surface of the hollow slab is sealed by the ultra-high performance concrete layer, so that the durability of the structure can be ensured; the reinforcing bar is upwards buckled at the plug plate and stretches into the plug plate hole, so that the reinforcing bar at the bottom of the hollow plate can be well anchored.
Description
Technical Field
The utility model relates to a bridge engineering field specifically is an improve reinforced structure of small span bridge is with empty core plate bending resistance bearing capacity.
Background
The hollow plate is a plate with a hollow cross section. Compared with a solid slab with the same span, the hollow slab has the advantages of light weight, convenient transportation and installation, and smaller building height than a T-shaped beam with the same span, so the hollow slab is more used in a small-span bridge.
In order to improve the bending resistance bearing capacity of the hollow slab for the small-span bridge, a commonly adopted method comprises the following steps: (1) adhering a steel plate or carbon fiber to the bottom surface of the hollow plate; (2) applying external vertical prestress; (3) and concrete is paved on the top surface of the hollow slab.
The technical problems existing in the method are mainly as follows:
(1) the bottom surface of the hollow slab is adhered with a steel plate or carbon fiber, and the end part of the steel plate or the carbon fiber is often stripped due to infirm anchoring, so that the ideal reinforcing effect of improving the bending resistance bearing capacity cannot be achieved;
(2) the construction difficulty of applying external vertical prestress is high, and the manufacturing cost is high;
(3) the development of cracks on the bottom surface of the hollow slab is difficult to control by paving concrete on the top surface of the hollow slab, and the structural durability is seriously influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an improve the reinforced structure of small span bridge with empty core plate bending resistance bearing capacity to effectively solve the problem of the not enough fracture that leads to of empty core plate because of bending resistance bearing capacity or even destroy.
The utility model provides a reinforcing structure for improving the bending resistance bearing capacity of a hollow slab for a small-span bridge, which comprises the hollow slab; the bottom surface of the hollow plate is provided with semicircular beam bottom reserved grooves which are transversely distributed, have a mutual distance of 20-30 cm and have a diameter of 1.5-3.5 cm, and plug plate holes which are vertically arranged and are connected with the beam bottom reserved grooves are arranged in plug plates at the end parts of the hollow plate; reinforcing steel bars are arranged in the beam bottom preformed groove and the plug plate hole (the end part of the reinforcing steel bar is bent upwards and arranged in the plug plate hole); and an ultrahigh-performance concrete layer is poured at the bottom of the hollow slab.
The steel bar adopts HRB400 grade or HRB500 grade, and the diameter is 20 mm-32 mm;
the diameter of the plug plate hole is the same as that of a semicircular beam bottom reserved groove arranged at the bottom of the hollow plate;
the thickness of the ultra-high performance concrete layer poured at the bottom of the hollow slab is 5-10 cm.
The construction method of the reinforced structure for improving the bending resistance bearing capacity of the hollow slab for the small-span bridge comprises the following steps:
A beam bottom preformed groove is formed in the bottom surface of the hollow plate, and a plug plate hole is formed in the plug plate; and performing chiseling treatment on the bottom surface of the whole hollow slab;
Compared with the prior art, the beneficial effects of the utility model are that:
1. the bottom surface of the hollow slab is additionally provided with the steel bars, so that the bending resistance bearing capacity of the hollow slab can be greatly improved;
2. the ultra-high performance concrete layer is additionally arranged at the bottom of the hollow slab, so that the bending resistance bearing capacity, the rigidity and the durability of the hollow slab can be further improved;
3. the ultra-high performance concrete layer can be well bonded with the hollow slab and the reinforcing steel bars, so that the hollow slab, the reinforcing steel bars and the ultra-high performance concrete layer can be combined together to work together; meanwhile, the ultra-high performance concrete layer can be used for sealing cracks generated on the bottom surface of the hollow slab, and the durability of the structure is effectively guaranteed.
4. The reinforcing bar upwards buckles and stretches into in the end cap plate hole in end cap board department, can make the reinforcing bar that the hollow slab bottom was add realize good anchor, plays the effect of reinforcing bending resistance bearing capacity.
Drawings
The attached drawings are schematic diagrams of the embodiments of the present invention, wherein:
fig. 1(a) is a schematic elevation view of a part (half part) of a hollow slab with a beam bottom preformed groove formed in the bottom surface and a plug plate hole formed in a plug plate;
FIG. 1(b) is a sectional view taken along line A-A in FIG. 1 (a);
FIG. 1(c) is a sectional view taken along line B-B in FIG. 1 (a);
FIG. 1(d) is a cross-sectional view taken along line C-C of FIG. 1 (a);
FIG. 2(a) is a schematic partial (half) elevation view of a hollow core panel with reinforcing structure added;
FIG. 2(b) is a cross-sectional view E-E in FIG. 2 (a);
FIG. 2(c) is a sectional view taken along line F-F in FIG. 2 (a).
In the figure: the concrete slab comprises 1-hollow slabs, 2-end plates, 3-beam bottom preformed grooves, 4-end plate holes, 5-reinforcing steel bars and 6-ultrahigh-performance concrete layers.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
With reference to fig. 1(a), fig. 1(b), fig. 1(c), fig. 1(d), fig. 2(a), fig. 2(b), and fig. 2(c), in this embodiment, the reinforced structure for improving the bending resistance bearing capacity of the hollow slab for the small-span bridge is provided, the bottom of the hollow slab 1 is provided with semicircular beam bottom preformed grooves 3 which are distributed transversely and have a distance of 25cm and a diameter of 2.5cm, and the plug plate holes 4 which are arranged vertically, are connected with the beam bottom preformed grooves 3 and have a diameter of 2.5cm are arranged in the plug plate 2 at the end of the hollow slab; HRB 400-grade steel bars 5 with the diameter of 28mm are arranged in the beam bottom preformed groove 3, the end parts of the HRB 400-grade steel bars are bent upwards and are arranged in the plug plate holes 2; the bottom of the hollow slab 1 is provided with an ultra-high performance concrete layer 6 with the thickness of 8 cm.
The construction method of the reinforced structure comprises the following steps:
a semicircular beam bottom reserved groove with the diameter of 2.5cm is formed in the bottom surface of the hollow plate, and a plug plate hole with the diameter of 2.5cm is formed in the plug plate; and performing chiseling treatment on the bottom surface of the whole hollow slab;
Claims (4)
1. A reinforced structure for improving the bending resistance bearing capacity of a hollow slab for a small-span bridge comprises a hollow slab (1); the hollow slab is characterized in that semicircular beam bottom reserved grooves (3) which are transversely distributed, 20-30 cm in distance and 1.5-3.5 cm in diameter are formed in the bottom surface of the hollow slab, and plug plate holes (4) which are vertically arranged and are connected with the beam bottom reserved grooves are formed in plug plates (2) at the end parts of the hollow slab; reinforcing steel bars (5) are arranged in the beam bottom preformed groove and the plug plate hole; and an ultra-high performance concrete layer (6) is poured at the bottom of the hollow slab.
2. The reinforcing structure for improving the bending resistance and the bearing capacity of the hollow slab for the small-span bridge according to claim 1, wherein the reinforcing steel bars (5) adopt HRB400 grade or HRB500 grade, and the diameter is 20 mm-32 mm.
3. The reinforcing structure for improving the bending resistance and the bearing capacity of the hollow slab for the small-span bridge according to claim 1, wherein the diameter of the plug plate hole (4) is the same as that of the semicircular beam bottom preformed groove (3) arranged at the bottom of the hollow slab (1).
4. The reinforced structure for improving the bending resistance and the bearing capacity of the hollow slab for the small-span bridge according to claim 1, wherein the thickness of the ultra-high performance concrete layer (6) poured at the bottom of the hollow slab (1) is 5-10 cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022305671.2U CN213508105U (en) | 2020-10-16 | 2020-10-16 | Reinforced structure for improving bending resistance bearing capacity of hollow slab for small-span bridge |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022305671.2U CN213508105U (en) | 2020-10-16 | 2020-10-16 | Reinforced structure for improving bending resistance bearing capacity of hollow slab for small-span bridge |
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| CN213508105U true CN213508105U (en) | 2021-06-22 |
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| CN202022305671.2U Active CN213508105U (en) | 2020-10-16 | 2020-10-16 | Reinforced structure for improving bending resistance bearing capacity of hollow slab for small-span bridge |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116464313A (en) * | 2023-04-17 | 2023-07-21 | 中南大学 | Reinforced concrete flexural reinforcement member and reinforcement method |
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2020
- 2020-10-16 CN CN202022305671.2U patent/CN213508105U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116464313A (en) * | 2023-04-17 | 2023-07-21 | 中南大学 | Reinforced concrete flexural reinforcement member and reinforcement method |
| CN116464313B (en) * | 2023-04-17 | 2024-01-30 | 中南大学 | Reinforced concrete flexural reinforcement member and reinforcement method |
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