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When used as subbase, the maximum particle size of gravel shall not exceed 50mm (square hole sieve).
How to evaluate whether the compacted specimen meets the requirements? Answer: after the last layer of sample is compacted, the height of the sample beyond the top of the test cylinder shall not be greater than 6mm, and the test piece with excessive height shall be discarded.
② Inspection of construction process, such as process inspection, concealed works inspection, etc.
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What is rigid pavement? Answer: rigid pavement refers to the pavement with large surface plate stiffness and high flexural tensile strength, generally referring to cement concrete pavement.
(2) Wet curing for 6 days and soaking for 1 day under the condition of 20 ℃ in the frozen area.
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(2) The edge of masonry shall be straight, smooth and firm.
What are the disadvantages of cement concrete pavement? Answer: 1) there are joints; 2) it cannot be opened to traffic immediately after construction; 3) it is difficult to excavate and repair; 4) the sunlight is too reflective; 5) there is a large demand for cement; 6) there are too many preparations before pouring concrete.
(2) It has good stability.
Only by making the compactness of each layer meet the requirements can the subgrade deflection value meet the requirements.
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What are the requirements for the maximum particle size of gravel when graded gravel is used as base and subbase? Answer: when graded gravel is used as base course, the maximum particle size of gravel shall not exceed 40mm (square hole sieve).
What is the effect of excessive oil stone ratio on quality? A: the correct selection of asphalt aggregate ratio is an important factor to ensure the quality of asphalt pavement.
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of construction and installation works according to the requirements of technical standards and technical specifications.
What are the commonly used instruments for highway survey? Answer: compass, theodolite, level, flat meter, hand alignment instrument, infrared range finder and total station.
The sundries, ponding and dirt on the reinforcement in the formwork shall be cleaned, the formwork shall have gaps and shall be tightly filled, and the inner surface of the formwork shall be coated with film remover.
(3) When pitting appears on several sides of the member, the side with the highest percentage of pitting area shall be used to indicate the degree of honeycomb pitting of the member.
What are the main contents of restoring alignment? Answer: (1) retest and restoration of traverse intersection point (2) retest and restoration of traverse turning point (3) restoration of middle pile of route (4) retest and addition of benchmark along the line.
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What are the basic contents of construction quality inspection, evaluation and acceptance of construction projects? Answer: sampling inspection of divisional and subdivisional works, inspection of construction quality assurance data and inspection of project appearance quality..
Excessive asphalt consumption will not only waste, but also cause diseases such as oil flashing, softening, oil bag, bag holding and so on.
③ Final inspection, such as sub item handover inspection, project completion inspection, etc.
Pavement cement concrete has high requirements for gravel.
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How to evaluate the honeycomb and pitted surface area of concrete surface? Answer: (1) for the honeycomb and pitted surface after concrete pouring and formwork removal, the honeycomb depth shall not exceed 1cm.
What is the content of the quality inspection stage? Answer: ① incoming inspection, such as the inspection of raw materials.
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For bridge construction, when should cross river leveling be carried out to check the elevation of benchmarks set on both banks of the river? Answer: when the water surface width of the river is more than 150m, cross river leveling shall be carried out to check the elevation of benchmark points on both banks.
What are the technical regulations (including operating regulations)? Answer: technical regulations (including operation regulations) are the concretization of technical standards and technical specifications.
Briefly describe the relationship between subgrade Top Deflection and compactness? Answer: the deflection value of the subgrade top surface is the deformation value under the load, that is, it reflects the overall strength of the subgrade, and the compactness reflects the compactness of each compacted layer of the subgrade.
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(2) The pitted surface area of each inclined plane in a member shall not exceed 1% of the surface area.
The asphalt surface used for the asphalt surface course is good, and what should be selected according to? Answer: according to regional climate conditions, temperature in construction season, pavement type, construction method, etc.
What is flexible pavement? Answer: flexible pavement refers to the pavement with small stiffness and low tensile strength, which mainly depends on compressive and shear strength to bear vehicle load.
What should be done before pouring concrete? Answer: before pouring, the support, formwork, reinforcement and embedded parts shall be inspected.
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What requirements should the base course of asphalt pavement meet? Answer: (1) it has sufficient stiffness and strength.
What is the effect of too small oilstone ratio on quality? Answer: if the amount of asphalt is too small, the mineral aggregate is not firmly bonded and compacted, which is prone to loose, pitted surface, water permeability and other phenomena, resulting in the early damage of the surface course.
Basic requirements for dry rubble? Answer: (1) large stones shall be selected during masonry, and staggered joints shall be squeezed tightly without looseness.
What is the 7-day unconfined compressive strength at the age of 7 days? Answer: (1) wet curing for 6 days and soaking for 1 day at 25 ℃ in non freezing area.
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What are the conditions of the measuring instrument that are regarded as unqualified? (1) Damaged; (2) Overload or misoperation; (3) Abnormal display; (4) There is a problem with the function; (5) Exceeding the specified weekly inspection and confirmation time interval; (6) The integrity of the instrument seal has been destroyed.
What are the common diseases of embankment slope? Answer: embankment slope collapse, slope gully, protective body sliding, protective denudation, chute suspension, etc.
How many types of conductors are commonly used on highways? Answer: closed conductor, attached conductor and branch conductor.
What characteristics must be possessed as the material of surface concrete? A: high flexural tensile strength, high wear resistance, good frost resistance and as low expansion coefficient and elastic modulus as possible.
They are the technical regulations on the construction process, operation methods, use of equipment and tools, construction safety technology, etc.
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What are the main factors affecting the results of angle measurement? Answer: (1) error of collimation axis and horizontal axis (2) leveling error of leveling pipe (3) error caused by non-standard operation (4) error affected by natural conditions (5) reading error.
What are the main items of bridge completion survey? Answer: (1) measure the bridge center line and span (2) measure the dimensions of piers, abutments, towers and anchors (3) check the bridge deck elevation.
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What are the elevation setting out methods? Answer: (1) the direct measurement method with level gauge is applicable to flat places; (2) Hanging steel ruler method is applicable to deep foundation pit or high bridge pier; (3) Trigonometric leveling method is applicable to deep foundation pit or high bridge pier.
Cuplock Scaffolding Bottom Cup
What are the main factors affecting concrete strength? Answer: (1) quality of raw materials, sand, cement and water (2) gradation composition of sand and stone (3) mix proportion and water cement ratio (4) mixing quality (5) transportation (6) vibration and leveling (7) maintenance (8) temperature 16.
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What are the main technical indicators for gravel in the specification? Answer: crushed stone crushing value index, needle and flake particle content, mud content and organic matter content.
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Which piles need to be nailed for centerline survey? Answer: (1) 20m pile or 50m pile (2) adding 100m pile (3) 100m pile and kilometer pile (4) starting, middle and ending piles of curve (5) indicating pile 19.
What are the manifestations and characteristics of hole collapse? A: the characteristics of hole collapse are that the water level in the hole drops suddenly, fine bubbles appear at the orifice, the slag discharge increases significantly without footage, and the load of the drilling rig increases significantly.
(3) The surface is flat and dense, and the camber is consistent with the surface course (4) it is well combined with the surface course.
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All types of pavement except cement concrete pavement and block pavement are flexible pavement.
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What are the main types of special subgrade? Answer: Subgrade in landslide section, subgrade in rock collapse and rock pile section, subgrade in debris flow area, subgrade in karst area, subgrade in permafrost area, subgrade in loess area, subgrade in expansive land area, subgrade in saline land area, subgrade in wind sand area, subgrade in snow damaged section and Subgrade in salivary flow section.
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