How to calculate the reinforcement of road dowel bar

1.

The dowel bar refers to the round steel bars arranged in the middle of the slab thickness every certain distance along the transverse joint of the cement concrete pavement. One end is fixed in one side plate, and the other end can slide in the adjacent side plate. Its function is to transfer traffic load between two road slabs and prevent platform staggering, increase stress transfer between adjacent concrete blocks, so as to prevent uneven settlement of concrete pavement caused by large local stress on concrete pavement, and transfer stress to make adjacent concrete blocks bear stress together

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the equipment is also used to detect 23 joints of two cement pavement sections in Illinois, USA. here, the evaluation standard of this paper is used to summarize the joint dowel deviation of North Hei Expressway and Illinois, USA. The following conclusions can be drawn from the comparison:

(1) compared with foreign high-quality construction level, DBI construction technology is still in its infancy in China, and the dowel bar deviation control technology needs to be improved

(2) the horizontal movement deviation leads to the unacceptable level of the dowel bar, which is 0% in the United States and 1.8% in the North black highway, indicating that the horizontal movement deviation can be well controlled by DBI process

(3) the longitudinal movement deviation leads to the unacceptable level of the dowel bar, which is 1.1% and 5.6% respectively in the United States and North black highway, and the proportion between the unacceptable level and the acceptable level is 12.4% and 29.3% respectively. The longitudinal movement of the dowel bar is closely related to the position of the slit

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5. Hehe, there will be detailed drawings in the design drawings
the general practice is that one end of the dowel bar is embedded in the middle of the pavement concrete (1 / 2 of the length), and the other end is covered with a sleeve when the concrete is poured and tamped
the main function of the dowel bar is to prevent the pavement on both sides of the expansion joint from sinking. The function of casing is to improve the damage of pavement caused by thermal expansion and cold contraction
generally, the dowel bar is round steel. The distance is about 50. It is explained in detail in the specific design< br />
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if you still don't understand, there's nothing I can do

6.

The first thing to correct is that the pull rod is set in the longitudinal direction, and the dowel rod is set in the transverse contraction and expansion joints

1. The left and right half of pouring, the middle is set with longitudinal rod, the setting of rod is related to your panel thickness and board width, board length

take the ordinary cement concrete surface as an example: when the plate is 3M and the surface thickness is 200-250mm, the pull rod is used φ 14 rebar × 700mm length × 900 mm, and the distance from the outermost transverse joint shall not be less than 10 mm (that is, the clear distance of not less than 100 mm between the two ends of a plate with a length of 4 meters)

2. The dowel bar should be round steel bar

take the transverse expansion joint as an example: when the surface thickness is 220mm, the diameter of dowel bar is 28mm φ The minimum length of dowel bars is 400mm and the maximum spacing of dowel bars is 300mm

3. The setting of the dowel bar is based on the transverse contraction joint and expansion joint, which means that the dowel bar is set only where there are transverse contraction joints and expansion joints, not between plates. In general, an expansion joint is set every 200m, or at the intersection of other roads, which must be set at the junction with the bridge

In this way, I'll show you some CAD drawings. If you need electronic version of CAD drawing, you are asking me

Moreover, I hope you can take a closer look at the code for design of highway cement concrete pavement structure JGT d40-2011

7. [question] what is the reinforcement content of common dowel bars and tie bars on ordinary cement concrete pavement
[answer] it depends on the specific design. Recently just do a quotation is: dowel core 0.5 kg; 4 kg. For reference only, hope to help you
the above contents are sorted out according to the problems encountered in the actual work of the students for reference. If you have any problems, please communicate and correct them in time.

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