rinse plain cement slurry around once; ③ The fine aggregate concrete with higher strength shall be poured twice
.
2) the formwork support is not equipped with sweeping rod, the spacing between vertical and horizontal rods is too large, the anti-skid safety fasteners are not fastened, and the vertical and horizontal horizontal rods are not set at the upper part
.
The general contractor is the organizer and direct controller of the project construction, the core and key subject of the project quality control, and should play a leading role in preventing Jerry building in the project construction
.
The anti-skid safety fastener is not fastened; The length of the upper end of the vertical pole extending out of the top horizontal pole exceeds the specification requirements
.
2) At the junction of frame column and beam, 1 ~ 2 densified hoops are often placed less, and some have only outer hoops but no inner hoops
.
4
.
Second, what are the common forms of Jerry building? 1
.
4) No vibration, missing vibration or random vibration during concrete pouring
.
The coiled material shall be pressed into the wall groove, fixed with pressure strip nails and sealed tightly with sealing materials
.
It mainly involves three related parties: the construction party: in order to reduce the project cost, the design party and the construction party are required to adopt or use low-quality materials and components for design and construction
.
6) Before sealing the column wall formwork, the loose concrete, sawdust and sundries at the bottom are not cleaned up; The sawdust and sundries at the beam bottom shall not be cleaned
.
5) Tie bars are not placed on both sides of structural columns and construction holes according to the specification requirements
.
how to determine whether it belongs to Jerry building? Jerry building is an act taken by all parties involved in project construction to reduce project quality standards, violate project construction quality acceptance specifications and escape quality supervision and acceptance procedures based on their own economic interests
.
The disclosure contents shall be operable and the process flow standards and quality acceptance standards shall be defined
.
5) The floor slab is not subject to secondary plastering, polishing, watering and maintenance, or the maintenance time is insufficient
.
2) The base course treatment is not in place during waterproof construction, such as not solid and not clean; The internal and external corners are not provided with arc corners, and no additional waterproof layer is provided
.
2
.
1
.
3、 Prevention and control measures for Jerry built materials 1
.
roughening of portal; ②
.
3) The lap joint of coiled material is not tight, and the end does not meet the requirements
.
For the parts with complex processes and frequent common quality problems, the model must be used to guide the way
.
Circular arc shall be made at the internal and external corners in the base course of coiled material waterproof surface course
.
4) The cushion blocks of the protective layer are placed less or do not meet the requirements, especially at the beam bottom
.
The disclosure shall be made in advance
.
2
.
The official account of building engineering is recommended by the following code.
.
After the process is completed, the acceptance procedure shall be strictly followed
.
The height of the groove from the finished surface of the roof shall not be less than 250mm, and the wall above the groove shall be waterproof
.
Details of waterproof base course ▲ the concrete waterproof base course shall be solid, clean, flat, calendered and free of sand
.
▲ no tie bar ▲ tie bar has been set 6) the concrete pouring at the top of structural column is not dense
.
The second concrete shall be poured to the place away from the plate opening for light treatment
.
9) No roughening, cleaning, pumping, curing, etc
.
3
.
3) Reinforcing bars, additional bars, etc
.
Many subcontractors earn profits by substituting poor for excellent and shoddy
.
Construction unit (including general contractor, subcontractor and team): the material quality is lower than the design and specification requirements, and the construction process does not comply with the construction process standards and quality acceptance standards
.
shall be conducted during the pouring of post cast strip
.
The internal and external corners of the waterproof surface course base course shall be circular arc
.
Plastering works 1) before plastering, the joints of walls of different materials shall be omitted to hang nets
.
2) Do not wet the formwork before pouring concrete
.
3) When the formwork joint is too large, effective measures shall not be taken, but snakeskin bags shall be used to stop the leakage
.
Requirements for arc diameter: asphalt waterproof coiled material 200 ~ 300mm, polymer modified asphalt waterproof coiled material 100mm and synthetic polymer waterproof coiled material 40mm
.
It shall be treated with waterproof materials once (the pipe edge shall be turned to 50mm above the building elevation and 150 ~ 200mm around the hole edge)
.
Waterproof Engineering 1) non standard products are used as waterproof materials, such as insufficient coil thickness and other indicators are not up to standard
.
For example, the loose concrete and laitance are not removed at the column wall construction joint
.
The direct and root causes of unqualified quality
.
④
.
3) The mortar is not full
.
The thickness of the first concrete shall be controlled at 1 / 3 ~ 1 / 2 of the plate thickness and tamped and compacted with a steel bar
.
6) “Slimming reinforcement” shall be adopted, and the tensile rate of coiled reinforcement shall exceed the specification requirements (the cold drawing rate of plain round reinforcement shall not be greater than 4%, and the cold drawing rate of ribbed reinforcement shall not be greater than 1%)
.
5) Formwork reinforcement is not in place, resulting in formwork running and expansion
.
2) Corner protection is not made for plastering, and the number of cakes is too small
I
.
Formwork works 1) the thickness, size and quality standards of formwork and wooden brace fail to meet the requirements, and the thickness of steel pipe fasteners is too thin and seriously rusted
.
4
.
Reinforcement works 1) reinforcement binding is too thin, jumping and missing, especially the reinforcement at the bottom of the beam
.
7
.
4) The anchorage length of embedded reinforcement of masonry tie bar is insufficient and loose
.
2) Blocks shall not be wet in advance, and dry bricks shall be put on the wall during masonry construction
.
Supervision unit: failing to perform supervision duties and strictly implement acceptance procedures, etc
.
Punishment and repair measures shall be taken for frequent quality problems
.
5
.
8) During concrete pouring, there is no reinforcement worker and carpenter on duty, and there is no one to deal with formwork running and blasting
.
6
.
Strictly speaking, it is an illegal act
.
Review and check frequently in the process
.
Concrete engineering 1) the cement parameter in the mix proportion of commercial concrete is low
.
Source: the copyright of Baidu Library and Douding construction belongs to the original author
.
6) The construction joint shall not be roughened
.
7) The hanging holes on the roof and toilet are not poured twice, which is easy to cause leakage
.
5
.
Masonry works 1) the size deviation of blocks is large, the curing age is insufficient, and the quality does not meet the requirements
.
3) Add water during concrete pumping and pouring
.
The closed water test shall be carried out
.
Requirements for arc diameter: asphalt waterproof coiled material 200 ~ 300mm, polymer modified asphalt waterproof coiled material 100mm and synthetic polymer waterproof coiled material 40mm
.
①
.
3
.
Strict material acceptance system to prevent subcontracting from earning price difference by substituting poor for excellent and shoddy
.
2
.
The operation team and subcontractors who fail to correct after repeated education shall be dismissed from the site
.
7) For beam column joints with large difference in concrete grade, steel wire mesh is not used for blocking or the blocking is not firm
.
It survives at one time during plastering, and maintenance is not carried out after plastering
.
shall not be installed on the reinforcement
.
▲ exposed reinforcement of column ▲ exposed reinforcement of slab bottom ▲ exposed reinforcement of beam bottom 5) the raw materials of reinforcement are not cut flat head, and the number of effective threads for straight thread connection is insufficient
.
Other semi-finished materials and finished materials can not meet the requirements of national standards, that is, often referred to as “non-standard” products, such as the thickness of stainless steel pipes for railings, ceramic tiles and other decorative materials
.
4) The spacing of split screw does not follow the scheme
.
