by 1.
The jacking of beam section shall meet the following requirements: (1) the oil pump and Jack shall be calibrated together.
(2) The rated jacking force of the jacking Jack and the allowable tension of the pull rod shall not be less than 2 times of the design maximum jacking force.
(3) During the pushing process, the guidance, deviation correction and other monitoring work shall be carried out according to the design requirements to confirm that the deviation meets the design requirements.
(4) During the pushing process, the supplementary sliding block shall be inserted behind the sliding seat in time.
The inserted sliding blocks shall be arranged compactly, and the maximum clearance shall not exceed 20cm.
(5) The oil pump for jacking jack shall be equipped with synchronous control system.
When pushing on both sides, the left and right should be synchronized; During multi-point pushing, the vertical and horizontal directions of each jack shall be synchronized.
2.
Before use, the machines and equipment for construction by jacking method shall be inspected and tested to be qualified.
3.
The construction of formwork, reinforcement, prestress and concrete shall meet the specific requirements of corresponding safety technical disclosure.
4.
During the jacking process, the displacement of pier top shall be detected at any time, and its longitudinal and transverse displacement shall not exceed the design provisions.
5.
Prefabricated pedestal shall not be set under the power overhead line.
When there is power overhead line on one side of the prefabricated pedestal, its horizontal distance shall meet the safety requirements of construction power.
6.
Before the concrete pouring of precast beam section, the guide beam shall be installed in place, and the embedded parts connected between the guide beam and the beam section shall be installed firmly.
After inspection and acceptance, it is confirmed that they meet the design requirements and form documents, the beam section concrete can be poured.
7.
In case of abnormal conditions such as deformation of pull rod, loosening of pull anchor, loosening of prestressed anchorage of main beam and deformation of guide beam during jacking, the jacking must be stopped and handled properly.
The jacking can be continued only after confirming that it meets the requirements.
8.
When the sliding device is removed before the beam is dropped, each fulcrum shall be lifted evenly, the jacks on the same pier and abutment shall be carried out synchronously, and the jacking height difference between the beam bottom on both sides of the same pier shall not be greater than 1mm; The jacking height difference of beam bottom on adjacent piers and abutments shall not be greater than 5mm.
9.
Before the construction of jacking beam erection, the construction design of temporary pier, guide beam and beam making pedestal shall be carried out, and its strength, stiffness and stability shall meet the construction safety requirements; Before use, it shall be accepted, confirmed to be qualified and documented; It shall be checked at any time during use.
Hidden dangers found must be eliminated in time.
It can be used only after it is confirmed to be safe.
10.
Before transportation of components, appropriate transportation vehicles, hoisting machinery and special tools shall be selected according to their quality and overall dimensions.
11.
The component stacking shall meet the following requirements: (1) the component stacking site shall be flat and solid without ponding.
(2) Guardrails shall be set at the component stacking site, and warning lights shall be added at night.
(3) The stacked components shall be placed horizontally or vertically according to the stress and shape of the components.
(4) The end of the reserved connecting bar of the component shall take measures to prevent the on-site personnel from being injured.
(5) The section size of the beam bottom skid shall be determined according to the component quality and ground bearing capacity, and the length shall not exceed 30cm of the component width.
When stacking T-beams, I-beams, truss beams and other large components, diagonal bracing must be set.
(6) The stacking height of members shall be determined according to the shape, strength, ground pressure resistance and stacking stability of members, and the beam shall not exceed two floors; The slab shall not exceed 2m; The skids shall be placed under the lifting point, the position of each layer of skids shall be on the same vertical line, and the thickness of the same layer of skids shall be equal.
12.
When the components are over height, over width, over length and over weight, a special transportation scheme shall be formulated and approved by the road traffic management department.
13.
Before the transportation of large components, the transportation route shall be surveyed to confirm that the bearing capacity (including bridges and underground facilities), width, turning radius, clearance through bridges and tunnels and clear height of overhead lines meet the transportation requirements.
Confirm that the minimum distance between transportation machinery and power overhead line must meet the requirements in the following table.
14.
The transportation of components shall meet the following requirements: (1) the crane shall be loaded and unloaded behind the vehicle.
(2) Before loading and unloading components, the machine and vehicle shall be braked.
(3) The parking place for vehicles and machinery shall be flat and solid.
(4) Transportation vehicles and hoisting machinery shall not be used or overloaded beyond the regulations.
(5) For the transportation of thin-walled components, a special fixing frame shall be set, which shall be placed vertically or slightly inclined.
(6) The supporting point during component transportation shall be on the same vertical line as the lifting point, and the support must be firm.
(7) Electricians shall be equipped to follow the vehicle and carry tools to protect the overhead line on the way and ensure the safety of transportation.
(8) For transportation of T-beam, I-beam, truss beam and other large components that are easy to overturn, they must be firmly supported on the beam web with diagonal braces.
(9) The components shall be placed symmetrically and evenly on the transport vehicle, and rubber pads and other cushion blocks shall be placed between the support point and adjacent components.
(10) When lifting and moving components, the lifting point position shall meet the design requirements, and the bending and torsion of the hook shall be corrected.
When the included angle of the lifting rope is greater than 60 °, a lifting beam shall be set.
(11) After the components are loaded, they shall be fastened on the vehicle body with a wire tightener.
During long-distance transportation, the firmness of the wire tightener shall be checked.
If it is found to be loose, it must be stopped and tightened.
After confirmation, it can continue to operate.
(12) When transporting T-shaped and I-shaped beams on site with towrows and flat cars, the operation area shall be delimited, and non operators are not allowed to enter; The road must be flat, solid, straight and gentle; The towing platoon and small flat car shall be placed in the lifting point area at both ends of the beam, diagonal bracing shall be set on both sides of the main beam, and the beam should be firmly stacked with the towing platoon and small flat car to maintain stability.
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