CN206090305U - Ultra high performance concrete common concrete combination bridge panel - Google Patents

Abstract

The utility model provides an ultra-high-performance concrete-ordinary concrete composite bridge deck, which comprises an ultra-high-performance concrete layer, an ordinary concrete layer and stressed steel bars. The ultra-high performance concrete layer is covered on the ordinary concrete layer, and the interface between them is a rough bonding surface. The stressed steel bars are arranged in the ultra-high performance concrete layer and the ordinary concrete layer, and the two are connected and work together through interface bonding force, occlusal force and shearing steel bars. The utility model significantly enhances the anti-cracking ability of the bridge deck in the negative bending moment area along the transverse and along the bridge, can use less or even no prestress, and can also reduce the thickness of the bridge deck. The utility model combines the respective advantages of ordinary concrete and ultra-high-performance concrete, and has the advantages of good crack resistance, good durability, high strength, high rigidity, light weight, good economy and easy construction, etc., and has wide application in bridge engineering. application prospects.

Description

An ultra-high performance concrete-ordinary concrete composite bridge deck

technical field

The utility model relates to the technical field of bridge engineering, in particular to an ultra-high performance concrete-ordinary concrete composite bridge deck.

Background technique

Under the action of load, there is a greater risk of cracking in the negative bending moment areas of the concrete bridge deck in the transverse direction and along the direction of the bridge. Since the bridge deck directly bears repeated loads of vehicles and is in a working environment that is prone to corrosion, cracking of the bridge deck not only directly affects its durability and safety during operation, but also reduces the stiffness of the bridge. At present, the configuration of steel bars and the introduction of prestress are mainly used to avoid cracking of concrete bridge decks or limit the width of cracks. For concrete continuous girder bridges or steel-concrete composite continuous girder bridges subjected to tensile cracking along the bridge direction, the tensile stress can also be reduced by lifting and lowering the bearings, adjusting the construction sequence of the concrete bridge deck, and weakening the combined effect of the negative moment zone. However, the above method is complex in construction and has the problem of large loss of short beam prestress.

Ultra-high-performance concrete is a kind of high-strength and high-durability concrete that does not use coarse aggregate, uses fine sand as aggregate, mixes a large amount of mineral admixtures such as silica fume, high-efficiency water reducer and fine steel fibers. , high toughness, dense concrete material, its compressive strength and tensile strength are much higher than ordinary concrete.

Utility model content

The purpose of the utility model is to provide a bridge deck structure with good crack resistance, convenient construction and good economy, so as to slow down the cracking of the bridge deck caused by negative bending moment, and further improve the durability, fatigue strength and stiffness of the bridge.

The technical solution adopted to realize the purpose of the utility model is as follows, a composite bridge deck of ultra-high performance concrete-ordinary concrete, including an ultra-high-performance concrete layer, an ordinary concrete layer and stressed steel bars. The ultra-high performance concrete layer is covered on the ordinary concrete layer. The stressed steel bars are arranged in the ultra-high performance concrete layer and the common concrete layer.

Further, the thickness of the ultra-high performance concrete layer is 30-150 mm.

Further, the interface between the ultra-high performance concrete layer and the ordinary concrete layer is a rough joint surface. The stressed reinforcement includes several transverse reinforcements, several longitudinal reinforcements and several shear reinforcements. The transverse reinforcement is bound with the longitudinal reinforcement to form a reinforcement cage. The shearing reinforcement runs through the rough joint surface, and its two ends are respectively connected to the transverse reinforcement in the ultra-high performance concrete layer and the ordinary concrete layer.

The technical effect of the present utility model is beyond doubt:

1. The use of ultra-high-performance concrete effectively improves the crack resistance of the concrete slab in the negative moment area, and significantly improves the durability, fatigue strength and stiffness of the bridge deck;

2. Using ultra-high-performance concrete with high cost in layers, the overall project cost is low and has good economy.

Description of drawings

Figure 1 is a cross-sectional view of a UHPC-ordinary concrete composite bridge deck.

In the figure: ultra-high performance concrete layer 1, ordinary concrete layer 2, longitudinal reinforcement 3, transverse reinforcement 4, shear reinforcement 5, rough joint surface 6.

detailed description

The utility model will be further described below in conjunction with the accompanying drawings and embodiments, but it should not be understood that the scope of the above subject matter of the utility model is limited to the following embodiments. Without departing from the above-mentioned technical ideas of the present utility model, various replacements and changes made according to common technical knowledge and conventional means in the art shall be included in the protection scope of the present utility model.

Example 1:

This embodiment discloses an ultra-high-performance concrete-ordinary concrete composite bridge deck, which includes an ultra-high-performance concrete layer 1, an ordinary concrete layer 2 and stressed steel bars.

The ultra-high performance concrete layer 1 is covered on the ordinary concrete layer 2 . The interface between the ultra-high performance concrete layer 1 and the ordinary concrete layer 2 is a rough bonding surface 6 . The stressed steel bars are arranged in the ultra-high performance concrete layer 1 and the ordinary concrete layer 2 .

In this embodiment, the ultra-high-performance concrete used in the ultra-high-performance concrete layer 1 refers to a kind of concrete that does not use coarse aggregate, but only uses fine sand as aggregate, and is mixed with silica fume and other mineral admixtures to achieve high-efficiency water reduction. Cement-based composites of additives and fine steel fibers. The specific mechanical performance indicators of the ultra-high performance concrete used are designed according to the stress requirements of the bridge.

Example 2:

Referring to FIG. 1 , this embodiment discloses an ultra-high-performance concrete-ordinary concrete composite bridge deck, including an ultra-high-performance concrete layer 1, an ordinary concrete layer 2 and stressed steel bars. The ultra-high performance concrete layer 1 is covered on the ordinary concrete layer 2 . The interface between the ultra-high performance concrete layer 1 and the ordinary concrete layer 2 is a rough bonding surface 6 . The stressed steel bars are arranged in the ultra-high performance concrete layer 1 and the ordinary concrete layer 2 .

The stressed reinforcement includes several transverse reinforcement bars 3 , several longitudinal reinforcement bars 4 and several shear reinforcement bars 5 . The transverse reinforcement 3 and the longitudinal reinforcement 4 are bound to form a reinforcement cage. The reinforcement cages are arranged in the ultra-high performance concrete layer 1 and the ordinary concrete layer 2 . The shear steel bar 5 runs through the rough joint surface, and its two ends are respectively connected to the transverse steel bars 4 in the ultra-high performance concrete layer 1 and the ordinary concrete layer 2 .

In an embodiment, the thickness of the ultra-high performance concrete layer 1 is 100 mm. In this embodiment, the ultra-high-performance concrete used in the ultra-high-performance concrete layer 1 refers to a kind of concrete that does not use coarse aggregate, but only uses fine sand as aggregate, and is mixed with silica fume and other mineral admixtures to achieve high-efficiency water reduction. Cement-based composites of additives and fine steel fibers.

After the initial setting of ordinary concrete 2, remove the soft mortar layer on the surface to make the surface clean and have a certain roughness. The ultra-high performance concrete layer 1 and the ordinary concrete layer 2 are reliably connected and form a combined action through interface cohesive force, occlusal force and shear reinforcement 5 .

Claims (3)

1. an ultra-high performance concrete-ordinary concrete composite bridge deck, is characterized in that: comprise ultra-high performance concrete layer (1), ordinary concrete layer (2) and stressed steel bar; Described ultra-high performance concrete layer (1) It is covered on the ordinary concrete layer (2); the stressed steel bars are arranged in the ultra-high performance concrete layer (1) and the ordinary concrete layer (2). 2. The ultra-high performance concrete-ordinary concrete composite bridge deck according to claim 1, characterized in that: the thickness of the ultra-high performance concrete layer (1) is 30-150mm. 3. A kind of ultra-high performance concrete-ordinary concrete composite bridge deck according to claim 1, characterized in that: the interface between the ultra-high performance concrete layer (1) and the ordinary concrete layer (2) is a rough joint surface (6); The stressed reinforcing bars include some longitudinal reinforcing bars (3), some transverse reinforcing bars (4) and some shearing reinforcing bars (5); the longitudinal reinforcing bars (3) and transverse reinforcing bars (4) are bound into reinforcement cages; The shearing reinforcement (5) runs through the rough joint surface (6), and its two ends are respectively connected to the transverse reinforcement (4) in the ultra-high performance concrete layer (1) and the ordinary concrete layer (2).