How to calculate the road dowel bar

1.

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2.

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

< H2 > extended data

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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7.

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 the traffic load between the two pavement slabs and prevent the staggered platform, increase the stress transfer between the adjacent concrete blocks, prevent the local stress of the concrete pavement from being larger, resulting in the uneven settlement of the concrete pavement, and transfer the stress so that the adjacent concrete blocks are stressed together

2. The tie bar refers to the special-shaped reinforcement arranged in the middle of the slab thickness at a certain distance along the joint of the cement concrete pavement. Its function is to prevent the slab from staggering and the gap between longitudinal joints from expanding

extended data:

dowel bar

in order to control the shrinkage and warpage stress caused by temperature change in concrete pavement, it is necessary to set various types of joints in the pavement, and set load transfer devices at the joints, so as to enhance the load transfer efficiency between two adjacent slabs

The engineering practice shows that the joint is the weak part of the cement concrete surface, and the load transfer capacity of the joint is the key factor affecting the service life of the cement concrete pavement and driving stability and comfort. However, the previous cement pavement design specifications did not specify the conditions for setting dowel bars at the transverse joints

the code for design of cement pavement (2003 Edition) stipulates that mmy joints with dowel bars shall be used for extra heavy and heavy traffic highways, toll plaza and three contraction joints adjacent to expansion joints or free ends

8. 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 />
http://www.ldstruc.com/simple/index.php?t22772.html
http://co.163.com/forum/content/1729_ 281072_ 1. HTM

if you still don't understand, there's nothing I can do

9. It should be the wrong mark of the unit. In terms of roads and bridges, the reinforcement of connecting rods such as cement pavement joints, construction joints and expansion joints are calculated by tons