The application experience of improving the smooth

Experience in improving the smoothness of cement concrete pavement

the engineering quality of cement concrete pavement is the concentrated expression of the use value of pavement products, and the pavement smoothness is an important index to measure the quality of pavement engineering. According to the actual situation of on-site mechanized construction, taking the GHP2800 cement concrete paver of gomaco gomaco company of the United States as an example, the following construction experience of improving pavement smoothness is analyzed and summarized

1. The adjustment of the paver itself. If the forming device of the paver is improperly adjusted during installation, resulting in the deformation of the forming mold or the shaking during construction, it will directly affect the flatness of the road. Therefore, the following points should be paid attention to during installation:

1. The tightness of 1 frame

(1) check whether the hanging connection of the forming mold is fastened to avoid the shaking of the mold during operation

(2) check whether the walking outrigger is worn to avoid shaking during walking

will affect the overall use effect of the equipment (3) check whether the telescopic guide plate at the walking outrigger is properly adjusted and fastened to avoid shaking of the outrigger during expansion and contraction

(4) check whether the diagonal brace at the walking leg is fastened and whether the support pin is worn and loose

to make the experimental scheme more flexible and enriched; (5) Check whether the joint between the leveler truss and the paving frame is fastened

(6) check whether the arch adjusting device on the mold is fastened and whether the auxiliary power of the oil cylinder works normally

1, 2 flatness of the trowel plate of the forming mold

(1) check whether the forming mold is straight during assembly. If the main formwork is deformed, the main formwork needs to be deformed, and the main formwork needs to be placed on a large enough platform (the platform needs to be polished smoothly) for adjustment

(2) check whether the trowel at the rear of the paver is straight, whether its tail end is about 3mm lower than the main formwork, and whether this state changes when the work is stressed

(3) check whether the girder of the trowel and the running track of the trowel trolley are straight, so as to avoid the uneven moving route of the trowel

(4) straighten and wipe the flat plate, with both ends slightly upturned 1 Mm, it is important to adjust the balance on the board well, the traveling speed of the trolley should be appropriate, and the time of reversing from the trolley to the end of both ends should be adjusted, not too fast and too fierce

automatic control of elevation 1 and 3

(1) check whether the outrigger oil cylinder and control valve are sealed and work normally

(2) whether the selection of control sensitivity is appropriate. If the sensor is used for a long time, it is inevitable that the sensitivity will decline. At this time, it is necessary to adjust the sensitivity to make necessary compensation when the welding structure also includes the brittle fracture of the pressure vessel. If the sensitivity is too high, it will cause unnecessary shaking of the fuselage

(3) whether the current value for controlling the opening of the solenoid valve is appropriate, generally between MA. After the machine is used for a long time, the movement resistance of the control valve spool will increase. At this time, it is necessary to appropriately increase the control current for artificial compensation

(4) the working travel speed of the machine is set by whether the electronic measurement system is too slow to convert the deformation of the force into an electrical signal. If the working travel speed of the machine is lower than 50cm/min, there will be "crawling" phenomenon, which means that the machine will stop and stop immediately, and the work is not coherent

(5) check whether the frequency of each vibrator can be adjusted effectively and timely at any time, whether the insertion depth of each vibrator is consistent, and if the vibrating effect of the vibrator is uneven, it will also cause the defect of local pavement flatness

(6) check whether the ramming plate is flat and straight, and whether its limit stroke is appropriate and consistent. Generally speaking, the lowest point reached by the ramming plate should be mm lower than the formwork, and whether the working speed is sufficient

(7) how accurate is the height zero adjustment of each outrigger, and whether there is a "negative inclination", that is, the main formwork is in a state of low front and high rear along the working longitudinal direction

(8) reduce the frequency of shutdown and waiting for materials, and try not to stop for more than 15min each time