Construction technical scheme of HDR high damping rubber bearing

Installation preparation: prepare HDR high damping rubber beam construction technical scheme, get familiar with construction drawings and relevant specifications, participate in joint review of drawings, and provide vibration isolation technical training for relevant personnel participating in project construction. The HDR high piling rubber beam and its embedded plates shall be stored in the site until the completion of the project, and shall be placed flat and stacked neatly and firmly, away from heat sources, acid and alkali, oil and chemicals, etc.
Concrete construction of lower pier (column): the concrete construction of lower pier (column) is the same as the conventional reinforced concrete construction. In order to ensure the installation accuracy of the lower embedded plate, the concrete of the lower buttress (column) should be poured twice or grouted twice.
Positioning and installation of the lower embedded plate: when the concrete reaches the initial setting, mark the positions of the center and boundary of the lower embedded plate and the top elevation of the embedded plate on the concrete surface of the lower pier (column) with the measuring instrument (total station). Set the elevation control point on the side of the lower pier (column) to check the horizontal positioning, elevation and flatness of the lower embedded plate. The anchor frame shall be vertically inserted into the middle of four sides of the support (at least one for each side) with a plumb bob, and fixed on the column reinforcement with a short reinforcement. The anchor frame screw (diameter ≥ 18mm) shall be reserved with a certain length, and the elevation shall be rechecked with an instrument to ensure that the elevation of the adjusting screw on each anchor frame is consistent.
Secondary concrete construction of lower pier (column): when the concrete of lower pier (column) is poured for the second time, the elevation, axis and flatness of lower embedded plate shall be checked again before concrete pouring. The sleeve bolt hole shall be sealed and protected. The concrete should be poured from the pouring hole through a special funnel to prevent the concrete from pouring into the bolt hole. The strength of the secondary poured concrete shall be improved by one grade, and the concrete shall have high mobility and shrinkage characteristics. Two 25mm diameter vent holes on the embedded plate can exhaust the gas in the concrete. The concrete shall be watered and cured for at least 14d 12h after pouring.
Installation of HDR high impedance rubber beam: the installation condition of HDR high impedance rubber beam is that the concrete of lower pier (column) must reach 75% of the strength. Before installation, the positioning of HDR high impedance rubber beam shall be retested and records shall be kept for filing. The specification and model of HDR high piling rubber beam shall be marked on the upper surface of corresponding lower pier (column) according to the layout plan after cleaning the upper surface of lower pier (column). HDR high piling rubber beam hoisting equipment shall be hoisted by tower crane on site or truck crane if not available. The upper and lower connection plates of HDR high damping rubber beam are connected by split steel. Fix the HDR high pressing rubber beam with slings and lifting screws on the upper and lower connecting plates of HDR high pressing rubber beam, and then use the specified steel wire rope (hemp rope core) to bind the support, and pad the corner pad at the corner to prevent the steel wire rope from being damaged. Hook the wire rope with the hook and lock the safety pin. U-shackle snap ring shall be selected as the lifting device at the lifting point, and double slings shall be used for lifting. In order to make the HDR high impedance rubber beam bolt hole corresponding to the lower embedded steel plate bolt hole, the HDR high impedance rubber beam shall be stably lowered and slowly rotated after being hoisted to the target position. When HDR high stamping rubber beam is in place, two skilled workers shall cooperate with each other for installation and one technician shall be assigned for guidance. When the bolt holes of connecting steel plates and embedded steel plates of the bearing are aligned, slowly lower HDR high stamping rubber beam. After confirming that the bolts are accurately inserted, place the bearing on the lower embedded plate. In order to ensure that each connecting bolt has a certain locking torque (the initial tightening torque is 75%), the bolts connecting the lower embedded plate and HDR high damping rubber beam shall be symmetrically tightened (on diagonal or opposite sides). Re-measure the elevation and plane position of HDR high pressing rubber beam after the installation of HDR high pressing rubber beam, and record for filing.