CN102704393B - Bridge deck continuous device applied to beam bridge and bridge deck continuous method - Google Patents

Abstract

The present invention firstly provides a bridge deck continuous device applied to girder bridges, which includes an arched structure, the two sides of the arched structure are provided with mounting surfaces for connecting with the bridge deck beam body, and the top of the arched structure along the width direction Features ribs in the shape of an I-beam. The present invention also provides a bridge deck continuous method using the bridge deck continuous device, which includes the following steps: placing the bridge deck continuous device on the concrete beams on both sides of the bridge deck continuous part, laying a bridge between the installation surface and the contact part of the concrete beam Asphalt felt; pouring bridge deck pavement concrete; making slits at the joints between the bridge deck pavement concrete and the two ends of the continuous part of the bridge deck. The present invention can change the current situation that the continuous structure of the bridge deck is easily damaged and difficult to repair, improves the durability of the continuous structure of the bridge deck, ensures the driving safety of the bridge, increases the driving comfort of the highway bridge, and solves the problems caused by poor handling of the continuous parts of the bridge deck. The problem of water damage caused by bridge piers and cover beams can effectively improve the service life of highway bridges.

Description

A bridge deck continuity device and bridge deck continuity method applied to girder bridges

technical field

The invention relates to a bridge deck continuous device and a bridge deck continuous method of a girder bridge.

Background technique

With the progress of society and the rapid development of economy, the proportion of bridges on roads to the total length of road routes is getting higher and higher, even reaching 40% on some high-grade roads. Among all types of bridges, simply supported girder bridges are currently the most commonly used type of bridge due to their convenient construction and low cost, especially simply supported slab girder bridges, which have obvious advantages over other bridges in terms of construction and installation , The quality of girder slab pouring is also easy to be guaranteed, and it has an absolute advantage in small and medium bridges. Simply supported slab girder bridges are widely distributed in highways and urban roads.

However, simply supported slab girder bridges also have some inherent shortcomings. In order to facilitate transportation and hoisting, the size of the components is limited, and there are many joints and poor integrity. The impact of the wheel has a great impact on the structural safety and durability, especially the connection parts, which are prone to early damage and damage under the impact force. At the same time, in the past ten years, the rapid development of economic construction has led to a rapid increase in highway traffic. Overspeeding and overloading have become an important source of bridge diseases and are seriously threatening the safety of bridge structures.

The bridge deck continuous device is a measure proposed to improve the driving conditions of the simply supported beam bridge, reduce the horizontal connection facilities, and avoid the installation of expansion devices. In the porous simply supported beam, it is not necessary to set expansion joints between two adjacent spans Instead, the deck pavement layer is used to connect the bridge decks between adjacent span bridges into one. Ensure the stability and comfort of driving, save investment, and reduce traffic pollution. The construction of seamless bridges began in the United States in the 1930s, developed rapidly in the 1960s, and is now quite popular. Since the advent of continuous bridge deck structures in the 1970s in my country, this device has been widely used. Through a large number of engineering practices, it has been proved that although the bridge deck continuous device has created favorable conditions for the stability of driving, it has also reflected many problems during use. The phenomenon of concrete cracking at the continuous part is very common, which causes water seepage on the bridge deck and affects The durability of the cap-beam concrete, while the traffic smoothness of the bridge is compromised. In recent years, the increase in traffic volume has greatly shortened the service life of the continuous structure of the bridge deck. There are more and more repair projects for the continuous structure of the bridge deck. Water damage to the cap beams and platform caps of simply supported bridges has become a very common The form of the disease is shown in Figure 1 and Figure 2. After investigation, it was found that more than 70% of bridges in Zhejiang Province have this type of disease in the cap beams and platform caps, and the situation in other provinces is roughly the same. Therefore, in view of the characteristics of this disease, it is very necessary to improve the continuous deck structure of simply supported girder bridges and develop a new type of continuous deck structure.

Contents of the invention

The first technical problem to be solved by the present invention is to provide a bridge deck continuous device applied to a girder bridge, which can alleviate the concrete cracking disease at the continuous part of the bridge deck.

For this reason, the present invention adopts the following technical solutions: the bridge deck continuous device includes an arched structure, the two sides of the arched structure are provided with mounting surfaces for connecting with the bridge deck beam body, and the upper part of the arched structure is along the Ribs in the shape of I-shaped beams are arranged at intervals in the width direction.

Another technical problem to be solved by the present invention is to provide a bridge deck continuous method applied to girder bridges, which is easy to implement and easy to guarantee quality.

For this reason, the present invention adopts following technical scheme: it is provided with above-mentioned bridge deck continuous device, and comprises the following steps:

1) Put the bridge deck continuous device on the concrete beams on both sides of the bridge deck continuous part, connect the installation surface of the bridge deck continuous device with the concrete beams on both sides of the bridge deck continuous part through bolts, the installation surface Pave asphalt felt between the contact parts with the concrete beam body;

2) Pour the bridge deck pavement concrete, and the concrete in the continuous part of the bridge deck in the bridge deck pavement concrete and the bridge deck pavement concrete outside the two ends of the continuous part of the bridge deck are jointly stressed through the connection of longitudinal steel bars;

3) After the concrete pouring of the bridge deck pavement is completed, cut joints shall be made at the joints between the concrete in the bridge deck continuous part and the bridge deck pavement concrete outside the two ends of the bridge deck continuous part in the bridge deck pavement concrete.

While adopting the above-mentioned technical solutions, the present invention can also adopt or combine the following further technical solutions: in step 2), a steel mesh is set above the bridge deck continuous device, and the scope of the steel mesh exceeds the range described in step 3). In the connection part, the steel mesh is connected with the longitudinal reinforcement in the bridge deck pavement concrete outside the two ends of the continuous part of the bridge deck.

Due to the adoption of the technical scheme of the present invention, the present invention proposes construction measures for the continuous device of the I-rib arched bridge deck. The provided continuous device of the bridge deck adopts steel plate material at the continuous part of the bridge deck, and processes it into an arched structure. The ribs in the shape of I-beams are added at a certain distance on the arch, so that the purpose of delaying and mitigating concrete cracking at the continuous part of the bridge deck can be achieved.

The bridge deck continuous method provided by the present invention applies the bridge deck continuous device to the girder bridge, which is easy to implement and easy to guarantee the quality. It can change the current situation that the continuous structure of the bridge deck is fragile and difficult to repair, improve the durability of the continuous structure of the bridge deck, ensure the driving safety of the bridge, increase the driving comfort of the highway bridge, and solve the problem caused by the poor treatment of the continuous part of the bridge deck. Bridge pier, cover beam water damage problem, thereby effectively improving the service life of highway bridges.

Description of drawings

Fig. 1 is a schematic diagram of a traditional bridge deck continuous device, wherein reference numeral 12 represents a double-layer steel mesh.

Fig. 2 is a schematic diagram of a traditional bridge deck continuous device applied to a bridge structure.

Fig. 3 is an elevational view of the I-rib arch bridge deck continuous device provided by the present invention.

Fig. 4 is a cross-sectional view of the I-rib arch bridge deck continuous device provided by the present invention.

Fig. 5 is an overall structural diagram of the I-rib arch bridge deck continuous device provided by the present invention.

Fig. 6 is a finite element calculation model diagram of the I-shaped rib arch bridge deck continuous device provided by the present invention.

Detailed ways

Refer to attached picture.

The invention introduces the arch structure in the bridge structure into the continuous part of the bridge deck, and disperses the stress concentration phenomenon of the concrete at this part. The bridge deck continuous device of the present invention includes an arch structure 1, and the two sides of the arch structure 1 are provided with mounting surfaces 11 for connecting with the bridge deck beam body. For vehicle loads, steel plates with a thickness of 9mm are used as the device material. Bolt holes 3 are provided on the mounting surface 11 . The upper part of the arched structure 1 is provided with I-beam-shaped ribs 2 at a certain distance along the width direction. On the one hand, the bearing capacity of the device can be improved, and on the other hand, the tensile stress borne by the concrete can be better dispersed.

Bridge deck continuous method of the present invention comprises the following steps:

1) Place the bridge deck continuous device on the concrete beam body 5 on both sides of the continuous bridge deck, connect the installation surface 11 of the bridge deck continuous device with the concrete on both sides of the continuous bridge deck through the bolt 4 The beam body 5 is connected as a whole, and a double layer of asphalt felt is laid between the installation surface of the arched structure and the contact part of the concrete beam body; in order not to limit the longitudinal expansion and contraction deformation of the beam body 5, the bolt hole 3 is made into a waist hole, which can be fixed if necessary. Small distance adjustment.

2), pouring the bridge deck pavement concrete 10, the concrete in the bridge deck pavement concrete in the continuous part of the bridge deck and the bridge deck pavement concrete outside the two ends of the continuous part of the bridge deck are jointly stressed through the connection of longitudinal reinforcement;

In this embodiment, the above-mentioned reinforcement connection adopts the following method: a longitudinal reinforcement mesh 7 is arranged above the continuous device of the bridge deck, and the scope of the longitudinal reinforcement mesh 7 exceeds the following connection parts, and the longitudinal reinforcement mesh 7 is continuous with the bridge deck Longitudinal reinforcement connections in the deck pavement concrete outside the two ends of the site.

3) After the pouring of the concrete for the bridge deck pavement is completed, a slit 6 shall be made at the joint between the concrete in the continuous part of the bridge deck and the bridge deck pavement concrete outside the two ends of the continuous part of the bridge deck. The continuous part of the bridge deck is the area between the left and right slits 6 .

The reference numeral 8 is a bridge pier, and the reference numeral 9 represents an expansion joint.

The invention changes the continuous form of the traditional bridge deck, utilizes the stress characteristics of the arch structure to disperse the stress of the continuous concrete on the bridge deck, and has obvious effect. Further illustrate technical effect of the present invention according to simulation calculation analysis below:

(1) The finite element simulation models of the traditional bridge deck continuous device and the I-rib arched bridge deck continuous device are respectively established.

(2) Simulating the actual bridge structure, applying live load and temperature, comparing the calculation results of the two, and demonstrating the utility of the present invention.

The stress of the continuous part of the bridge deck is mainly caused by two types of reasons, one is caused by the deformation of the beam body (expansion, deflection) caused by the deformation (expansion, rotation angle) of this part, and the other is that the load directly acts on this part. The stress on the continuous part of the bridge deck of simply supported beam mainly has the following conditions:

1) The shrinkage or elongation of simply supported beams caused by overall temperature changes will cause tensile and compressive stresses on the continuous parts of the bridge deck. This effect is Case 1.

2) Tensile and compressive stresses on the continuous parts of the bridge deck caused by vehicle braking force. This effect is called Case 2.

3) The downdeflection corner effect caused by the lane load fully covering two adjacent spans, the corner deformation will cause the continuous part to generate bending stress in which the upper edge is pulled and the lower edge is compressed. This effect is called Case 3.

4) The positive temperature difference in the gradient temperature action will cause the deflection angle effect at the end of the beam, and the deformation of the corner will cause a positive bending moment at the continuous part, resulting in compression on the upper edge and tension on the lower edge; the reverse temperature difference effect is just the opposite. This effect is called Case 4.

5) The local force effect caused by the wheel load acting on the continuous part of the bridge deck, which causes local compression on the continuous part, and produces a similar bending effect due to the thin continuous structure of the bridge deck. This effect is called Case 5.

Several of the above five working conditions may occur at the same time at a specific moment. Considering the cracking of the concrete under tension, the combination is made according to the most unfavorable situation of the upper edge under tension. For the tensile stress σ _sl on the upper edge of the continuous structure of the bridge deck, the combination of "working condition 1 (overall cooling) + working condition 2 + working condition 3 + working condition 4 (inverse temperature difference)" is the most unfavorable, that is:

σ _sl = σ _w + σ _z + σ _q + σ _t . . . . . . . . . . . . . . . . . . . . . . . . . . . .

This effect is called case combination.

In order to verify the effectiveness of the device of the present invention, the traditional bridge deck continuous structure is used as the comparison object, the deformation and stress characteristics of the structure under various loads are analyzed by finite element method, and the influence of construction measures on the continuous force of the bridge deck is compared.

The calculation and analysis adopt the large-scale general-purpose finite element program ABAQUS 6.9. In addition to the fine simulation geometric model, the distribution and material properties of the steel bars are also simulated strictly according to the design conditions.

Table 1 Summary of main tensile stress of bridge deck continuous concrete under different working conditions (unit: MPa)

The main body of the device of the present invention is an arched structure, so that under the deformation of the corner of the beam end, the coordination range of deformation at the continuous part of the bridge deck is increased, and the corner of unit length is reduced, so that the stress is greatly reduced. The reduction of stress helps to improve the cracking situation at the continuous part of the bridge deck. The reduction of the corner per unit length (that is, the increase of the radius of curvature) greatly delays the occurrence of reflection cracks in the asphalt concrete layer, or even does not appear reflection cracks.

Claims (5)

1. A bridge deck continuous device applied to beam bridges, characterized in that: said bridge deck continuous device comprises an arched structure, and both sides of said arched structure are provided with mounting surfaces for connecting with bridge deck beams , the upper part of the arched structure is provided with I-beam-shaped ribs at a certain distance along the width direction. 2. A bridge deck continuous device applied to girder bridges according to claim 1, characterized in that: said arched structure uses steel plates as the device material. 3. A bridge deck continuous device applied to girder bridges according to claim 1, characterized in that: said mounting surface is provided with bolt holes, and said bolt holes are waist-shaped holes. 4. A bridge deck continuous method applied to girder bridges is characterized in that: it is provided with the bridge deck continuous device described in claim 1, 2 or 3, and said bridge deck continuous method also includes the following steps: 1) Put the bridge deck continuous device on the concrete beams on both sides of the bridge deck continuous part, connect the installation surface of the bridge deck continuous device with the concrete beams on both sides of the bridge deck continuous part through bolts, the installation surface Pave asphalt felt between the contact parts with the concrete beam body; 2) Pour the bridge deck pavement concrete, and the concrete in the continuous part of the bridge deck in the bridge deck pavement concrete and the bridge deck pavement concrete outside the two ends of the continuous part of the bridge deck are jointly stressed through the connection of longitudinal steel bars; 3) After the concrete pouring of the bridge deck pavement is completed, cut joints shall be made at the joints between the concrete in the bridge deck continuous part and the bridge deck pavement concrete outside the two ends of the bridge deck continuous part in the bridge deck pavement concrete. 5. A bridge deck continuous method applied to girder bridges as claimed in claim 4, characterized in that: in step 2), a steel mesh is set above the bridge deck continuous device, and the scope of the steel mesh exceeds step 3 ), the steel mesh is connected to the longitudinal steel bars in the bridge deck pavement concrete outside the two ends of the continuous part of the bridge deck.