Preface the starting and ending mileage of TJ-2 bid section of an expressway in Zhengzhou is K2 + 000 ~ K13 + 000.
5.2.5 the specification and strength of the joint filling material between plates shall meet the design requirements and coincide with the settlement joint.
Personnel, machines and tools organization type of work and personnel table No.
The inspection method and frequency 1.
Construction process flow and key points of operation 5.1 construction process flow cover plate construction process flow is: installation of support – Installation of bottom formwork and side formwork – Installation of reinforcement of the plate – pouring of cover plate concrete – concrete maintenance 5.2 basic requirements 5.2.1.
The inspection methods, technical requirements and allowable deviation inspection frequency of adjacent plate height difference ﹤ ruler ＜ 2 ﹤ 5 ﹤ 2m ruler ﹤ 5 ﹤ 5 ﹤ 5 ﹤ 5 ﹤ each set of formwork shall be inspected at 5 ﹤ axis height difference.
2.
The height (mm) of the concealed culvert is not less than the design value: spot check 30% of the slab, Check 3 sections of each slab, 3 width (mm), cast-in-situ ± 204 length (mm) + 20, – 10 feet: spot check 30% of the slabs, and check both sides of each slab.
Check according to Appendix D of jtgf80 / 1-2004.
All personnel related to construction must hold work permits and wear safety helmets at the construction site, otherwise a fine ranging from 50 to 100 yuan will be imposed.
The concrete strength (MPA) is within the qualified standard.
Reinforcement skeleton size length ± 10 feet measurement: spot check 30% of the total skeleton diameter ± 54; bending reinforcement position ± 20 feet measurement: spot check 30% of each skeleton; 5.
Theodolite 10 shall measure 2 points in the longitudinal and transverse directions.
The internal dimension of Take the axis as the center, measure the position of embedded parts at two points of the longitudinal formwork with a ruler less than 3mm, spot check the verticality or slope, and check the hanging line by 0.2% × For the quality inspection and acceptance standard of the cover plate, see the specified value or allowable deviation of the inspection items in the following table.
2.
number of machinery name and model remarks 1 crane 225t2 loader 1zl-503 reinforcement transport vehicle 14 concrete transport vehicle 510m35 generator 1100kw6 electric welding machine 4bxi-4007 plug-in vibrator 550 8 Quality control 8.1 see the following table for the quality inspection and acceptance standards of reinforcement processing: inspection of the specified value or allowable deviation (mm) inspection method and frequency 1 1 spacing between stressed reinforcement, foundation, pier and abutment ± 20 feet: inspection of two sections 2 stirrups, transverse horizontal reinforcement Spiral reinforcement spacing ± 10 feet measurement: check 5-10 spacing of each component; 3.
3.
5.
2.
The quality and specifications of cement, sand, gravel, water, admixtures and mixtures used in concrete must meet the requirements of relevant technical specifications, Construct according to the specified mix proportion.
9.2 the construction team shall conduct construction safety inspection every day, make detailed records, put forward maintenance or improvement measures, and implement them.
type of work quantity (person) 1 formwork worker 102 electrician fitter 23 welder 104 reinforcement worker 205 concrete worker 6 construction machinery configuration table No.
The area of honeycomb and pitted surface shall not exceed 0.5% of the surface area, and the honeycomb depth exceeding 10mm must be treated.
1.
9.
There are 24 culvert channels in the whole line.
8.4 appearance requirements 1.
6.4 admixtures are required to be made by the manufacturer, brand and quantity.
6.
The cover plate has a length of 29m, a width of 6.58m and a concrete dosage of 83.7m ³， The amount of reinforcement is 8413kg.
6.2 medium coarse sand is required to be well graded, hard and clean (river sand with mud content less than 2% and particle size less than 5mm) 6.3 crushed stones with uniform particle grading, hard texture and mud content less than 1% are required.
Combined with seasonal characteristics, focus on the implementation of measures to prevent electric shock, high-altitude falling, mechanical vehicle accidents, fire prevention, lightning protection and so on..
The concrete surface is flat, the edges are straight, and there are no serious gnawing edges and hanging angles.
Safety construction measures 9.1.
7.
In the process of concrete production, it is required to feed in strict accordance with the mix proportion determined by the test without any randomness, strictly control the water cement ratio and mixing time, spot check the moisture content of sand and gravel at any time with climate change, and adjust the water consumption in time.
Raw materials shall have sufficient stock to ensure that the color of concrete of the same structure is basically the same.
8.2 see the following table for the quality inspection and acceptance standards of formwork installation.
5.2.4 the plate body shall be free of exposed reinforcement and cavity.
Whether there are non stress cracks on the concrete surface.
If the cracks exceed 0.15mm, they must be treated.
5.2.3 during block construction, the joint shall be consistent with the settlement joint.
There are three sections of main line, * * interchange and service area.
Thickness of protective layer; column Beam ± 5 ruler measurement: each member shall be inspected at 8 places along the periphery of the formwork.
Material control 6.1 cement must be from the manufacturer designated by the owner, and small factory cement and miscellaneous brand cement must be strictly used.
The first item of K11 + 645 reinforced concrete cover plate is selected in the bid section.
9.3 adhere to the principle of focusing on self-examination, supplemented by mutual examination, and making changes while checking; Mainly check ideas, systems, disciplines, leaders, hidden dangers and accident handling.
Features 2.1 improve the concrete appearance quality of culvert cover plate 2.2 simple construction process, reliable construction quality and safe construction 3 Scope of application: culvert cover plate constructed by various cast-in-situ processes 4 Process principle: strictly control the processing, splicing and installation of formwork, control the preparation and vibration of concrete, ensure the rigidity, strength and processing accuracy of formwork, ensure that the surface of formwork is flat, smooth, square and tight without slurry leakage, and ensure that the external leakage surface of poured concrete meets the standard of fair faced concrete.
5.2.2 before pouring, the culvert abutment, pier and bearing surface must pass the inspection, and the plate and bearing surface must be close.
