1. Material preparation
In order to meet the requirements for the exit of the plant, three certificates of the product are to be provided and all detection indicators meet the requirements。
2. Pre-construction preparations
(1) all scalators, accessories, equipment, tools, etc. Used for this work should be delivered to the construction site prior to construction。
(2) traffic security signs should be installed at the construction site as required, equipment tools and supplies should be placed in a designated location or area, and all construction personnel should enter the construction site with safety clothing, hats and civilization。
3. Painting, cutting
(1) cut wires, 80-sided concrete protection bandwidths of 40 cm on both sides of the condensation line, and other types of condensation stitches determine the width of the device。
(2) when drawing a line, if the size of the previous pre-filling slot is smaller than the size of the drawing, the line shall be drawn by the size of the drawing; if the original pre-position is larger than the size of the drawing, the line shall be drawn by the size of the original pre-filling slot. It was also confirmed that the concrete protection bands on both sides of the installation were wide。
(3) the cutting area shall be cut in accordance with the above-mentioned cutting line and shall ensure that the trough is straight and the straightness is 1. 5 mm/m. After cutting, the cutting line shall not have any visible bends。
(4) before cutting, a three-metre straight-foot check of the flatness of the tarp layer requires control up to 1. 5 mm. Check if the bridge is broken, arched or collapsed. It was found that the asphalt road at the edge of the seam zone was not flat and should be extended to the entire line cutting。
(5) to prevent the contamination of the surface by cutting plasma, to wash the side of the cutting immediately with a high pressure water gun or to absorb the slurry with a broad band of tape paper attached to the cutting edges along a line of colour cloths。
4. Digging, cleaning
(1) the area of separation is based on the actual needs of the construction site and the accessibility needs of the site, the setting of signposts, the use of cones and colour flags on the bridge road。
(2) cleans up concrete layers and impurities in the outlet area based on the width of the cut。
(3) scratch concrete at the bottom of the suture area and clean up the tectonic impurities to ensure that the future is filled with concrete and beams。
(4) discrepancies shall be disposed of at a position beyond 1 m on the edge of the seam zone, and shall be covered by plastic cloths and removed from the construction site in a timely manner。
(5) when digging, wind rifles shall not be dug along the line cutting through the sea on the edge of the zone in order to prevent the disruption of the integrity of the asphalt road along the seam zone: the asphalt road outside the seam zone shall not be destroyed (including the breaking of an angle, lift)。
(6) fragmented concrete and dust in the tank area where the air press is used to blow (or high-pressure water gun flushing) and check that multiple dimensions, wide and deep, meet the construction chart requirements。
5. Welding equipment installation
(1) collapse pre-layed steel bars to smooth them and determine the detailed programme for the installation of convulsions based on the actual size of pre-layed steel bars。
(2) the stretcher is equipped with a bolting team to position it against the centre line of the pre-positioned beam, the length of which corresponds to the length of the suture area and the straightness is 1. 5 mm/m。
(3) the absence of pre-layed steel bars in the tanks or the incorrect location of pre-layed steel bars shall be reinforced by the addition of additional planting steel bars, which shall meet the design requirements in terms of their location, specification, quantity, anchor depth, resistance, etc。
(4) when the gear is installed, the gear is hung to the corresponding position, the flatness is adjusted, and the flatness is checked at a 3-metre-square scale, and the gear should be below 2 mm on the road, which does not permit a high exit。
(5) welding to connect steel bars and strengthen steel bars shall not lead them to the high side of the road and shall retain a shielding layer above 2. 5 cm。
6. Supporting templates and installation of scalable rubber water and..
(1) a template, as required. It is attached to the end of the suture between an agular steel and a beam, and the template is secured by wire (generally plate number 14). The sutures between the templates are then filled with slurry (or fillings such as somatics). (c) ensure the strength and integrity of the concrete-fed process。
(2) installation of a condensed rubber-condensed water belt, which shall be fitted to the middle corner steel of the frame using a card seat and shall be stretched to the outside of the collision-proof fence。
7. High and fast concrete pouring
(1) before the concrete is poured, it is necessary to check whether or not the template is tight and leaky, in order to avoid a silt or slurry in the event of a convulsion (importantly, otherwise the beam may die)。
(2) clean up the surface of the road within a 1 m radius on both sides of the seam zone and cover it with plastic sheeting or other materials to prevent contamination of the surface when concrete is poured。
(3) the surface of the platinum must be on the same plane as the asphalt and plate, and the error must be within 2-0 mm or otherwise returned to work。
(4) the use of high and fast structures for the repair of concrete, where materials should be self-flowing, micro-inflated and self-enriched, up to 20 mpa or more in two hours, will allow for instant open transport。
8. Technical requirements for scalable installation
Check items
Set value or allowed deviation
Check method or frequency
Length (mm)
Design requirements met
Metrics: every track
Sew wide (mm)
Design requirements met
Metrics: 1 in 2m per track
High difference with bridge (mm)
Zoom 2
Metrics: 5 on each side of the stretcher
Landscape (%)
General
±0. 5
Standard: 5 tests per track
Large
±0. 2
Standard: 5 tests per track
Horizontal flatness (mm)
≤3
3 m straight: 2 points each to check the condensers and anchor concrete in the direction of length
Weld size
Weld quality level 2 when not required for design
Measure: check everything, two places per weld
Welding wounds
Ultrasound: check all
9. Scalp adaptation attention:
(1) when the original bridge is removed, the pre-layed steel band shall be retained, and if the pre-layed steel band (brand 2) is damaged, re-planted at the corresponding position of the beam and ensure that the removal process does not damage the beam concrete to the extent possible。
(2) when a stretcher is installed, the breadth of the stretcher shall be determined on the basis of the prevailing temperature。
