The bridge expansion joint grouting construction plan

Summary: in bridge expansion joint repair engineering, the requirements of bridge expansion joint in parallel to the axis of bridge and perpendicular to the axis of the Bridges on the two directions of free expansion in a reliable way. Traffic is smooth, no sudden beating and noise. Should prevent rain and garbage soil infiltration clogs. Installation, inspection and maintenance to remove all dirt should be simple and convenient. In the setting of expansion joint, the rail and bridge deck pavement must be disconnected. The construction of bridge expansion joint method have? What are the precautions engineering disease? A, the effect of highway bridge expansion joint and classification 1. 1 the role of bridge expansion joint because the bridge in outdoor, in under the action of load, temperature, shrinkage and creep, beam displacement happens. When the displacement is too large, can affect the driving comfort and safety. In order to adjust the bridge superstructure displacement and connection, should be set expansion joints. But the improper design, installation quality is poor, lack of scientific and timely maintenance, expansion joints will jump, this is the common disease in our country, more and more prominent. Bridge expansion joint damage, settlement, wrong Taiwan such as accident, when the two cars through a jump impact of the bridge and the additional load, serious when affect the comfortableness of driving and cause safety accidents. In order to eliminate the phenomenon of platform, adopted many effective ways in our country, including the installation of the bridge expansion joint is a very important project, construction defects cannot be ignored. 1. 2 bridge expansion joint is divided into five categories: steel support type, composite shear type ( Plate) , modules, support type, docking type seamless seamless connection. Second, the highway bridge expansion joint grouting construction 2. 1 construction preparation before construction, familiar with the construction drawings and expansion joints installation procedures, check the abnormity edge beam flatness, straightness and seam distance, according to the engineering actual situation, must be equipped with enough mec. Machinery and equipment, small machinery and springboard must be high quality, so that through the construction of the vehicle to pass and match well. Provide enough canvas, plastic sheeting, maintenance with plastic film and grassroots, in order to prevent the pollution of the road, in order to ensure the smooth construction. 2. 2 slit before construction, according to the layout of the construction design drawings, use cutting machine according to the joint, pay attention to the road outside the protected seam line, prevent pollution, and ensure the joints incision is in good condition. 2. 3 slot using gas picks slot, should clean up the groove concrete and sundry, especially within the beam end clearance of sundry, and clean up the groove embedded steel bar. If the number of embedded steel bar, the bolts should be used to fill the embedded steel bar. Should invite owner representing the mutual acceptance and supervision, to ensure the quality of expansion joint. 2. Installed 4 in 2. 4. 1 before expansion device, check the anchorage width of expansion joint. According to the general set appropriate 50 cm, the width of the abutment back wall is easy to appropriate, to strengthen the stability of the expansion joint device, convenient for bridge deck construction; Sort slot sundry, with water cannons and check whether clean, ST eel flatness check during the installation process. Steel telescopic straight weld detection and smoothness, flatness control in 2 mm, 3 mm along the flatness control in less than 2 mm, top surface and surface elevation control. 2. 4. 2 fixed, hang with gantry and 10 x 10 Angle position Angle, at the top of the expansion joints and the center line of the beam end overlap, expansion joint is lower than asphalt concrete road surface elevation ( 1 ~ 2毫米) 。 On each fixed position, height and straightness adjusting to comply with the design requirements, according to the expansion joint anchor side beam and reserve tank of embedded steel bridge width from one side to the other night time solid RY 2 - in turn 3 bolt welded joint welded to ensure there is no change, from one end of the welding symmetrically on both sides of the ban on translation. 2. 4. 3 to measure the height of a fixed in the joints, confirm no deformation, deviation, on either side of the anchor bar and embedded steel welded joint at the same time, all of a sudden, such as welding construction, the first one side welding, welding, etc. When the machine is one of a large number of long and temperature change, from one side welding after welding, on the other side on the left and right of the anchorage, and on the other side note steel spot welding and bolt, ensure the steel D information. In order to prevent the occurrence of jump car phenomenon, according to steel specification should be 0 2 mm range control, the expansion joints of welding is firm, removal of temporary fixed clamp, orientation Angle, the free expansion. 2. 4. 4 template installation template generally use foam board, fiber board, sheet iron, etc. , when installation, must be strong, strict, guarantee the concrete in the process of vibration is not moving, prevent the slurry into the gap, affect the use of the expansion joints. In 3, 3 mm below the road net height. 2. 5 pouring epoxy grout before pouring, should use the plastic sheet covering two seam, to prevent the pollution of concrete pavement. The slump of concrete should be less than 2 cm, in order to reduce the water cement ratio, improve the early strength, can be mixed with additives, reduce the surface drying shrinkage of concrete, epoxy grout without vibration, in the production of cement board, 4 to 5 times the pressure until smooth. Strict control of epoxy grout surface roughness, make its top faces with expansion joint device, etc.