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Common quality problems in building engineering and the catalogue of 200 cases.
The first chapter is an overview.

The first section construction engineering quality acceptance

The second quarter construction engineering quality accident analysis

Chapter II Foundation Engineering

Section 1 Earthwork

Problem 1 Water accumulation in site leveling.

Problem 2: Excavation slope collapses

Problem 3: Fill slope collapses.

Question 4: The excavation of foundation pit (trough) is soaked in water or meets quicksand.

Question 5. Backfilling settlement of foundation pit (groove)

Question 6: The density of backfill soil can not meet the requirements, which leads to the increase of foundation deformation.

Question 7: The foundation wall is extruded and deformed by backfill soil.

Section 2 Blasting Engineering

Question 8: In case of fire (fire)

Question 9: Irregular blasting surface

Problem 10 blasting slag is too large, so it needs secondary blasting.

Problem 1 1 The foundation crack is too large after blasting.

Problem 12 Slope instability after blasting.

In the third quarter, the replacement method of foundation engineering

Problem 13 The connection of lime-soil foundation is not handled correctly.

Problem 14 uneven gradation of gravel foundation.

Problem 15 Defects in Geosynthetic Foundation Laying

Problem 16 Defects in Fly Ash Foundation Laying

The fourth quarter technical foundation engineering

Problem 17 Laying Defects of Dynamic Compaction Foundation

Problem 18 Defects in Grouting Foundation

Problem 19 Shear failure of soil layer reinforced by preloading foundation.

The reinforcement effect of vibroflotation foundation is poor.

Question 2 1 The gunning pressure of high-pressure rotary jet grouting foundation is unstable.

Section 5 Foundation Engineering of Pile Foundation Reinforcement

Question 22: Defects of cement-soil mixing pile foundation

Question 23: Quality defects of soil and lime-soil compaction pile foundation

The pile body of cement fly ash gravel pile appears necking and broken pile.

Question 25: Defects of composite foundation with rammed cement-soil piles

Question 26: Shrinkage of sand pile foundation

Section 6 Pile Foundation Engineering

Question 27: The joint of static pressure pile is loose and cracked.

Pre-tensioned prestressed pipe pile sinking can not meet the design requirements.

Pre-tensioned prestressed pipe pile is broken or inclined.

The sinking of precast concrete piles can not reach the design elevation or is not easy to sink.

Question 3 1 deformation of steel pipe pile top

Problem 32: The strength and rigidity of welded joints of steel piles are insufficient.

Slump occurred when drilling the bored pile with mud retaining wall.

The concrete of vibro-immersed cast-in-place pile is not dense.

Question 35: The outer pipe of rammed expanded cast-in-place pile is not sealed at the bottom.

Question 36: Defects of borehole wall protection of dry bored piles

Well kick occurred during manual digging of piles.

Question 38: The concrete of the explosion-expanded bored pile is rejected.

Section 7 Foundation Pit Engineering

Question 39: Water leakage of row pile wall in row pile wall support project

Question 40: The depth of cement-soil pile wall is insufficient.

Question 4 1 Leakage of water and sand between the underground continuous wall anchor and the reserved hole.

Problem 42: Overload of single node of steel support

Leakage of groove wall of underground continuous wall

Question 44: The size deviation of reinforcing cage is too large or deformed.

Question 45: It is difficult for open caisson to sink or stop sinking.

Question 46: excessive ground subsidence caused by drainage and drainage works.

Chapter III Masonry Engineering

The first section brick masonry engineering

Question 47: Brick masonry has straight seams or "double skins" when it is assembled.

The horizontal mortar joint in the gap of brick wall is not straight.

Question 49. If the connection is not tight, the brick wall will leave a negative line.

Question 50: Brick walls with empty barrels are in disorder.

Question 5 1 Brick chimney is in disorder.

Question 52: The installation dimension of the formwork for brick pipe arch is out of tolerance.

Section 2 Small Concrete Hollow Block Masonry Project

Question 53: The transportation and stacking of small concrete hollow blocks are unreasonable.

Question 54: The application of small concrete hollow blocks has not passed the entrance inspection.

Question 55: The arrangement diagram of small concrete hollow block masonry is not drawn.

Question 56: The concrete core column equipment is unreasonable.

Question 57: There are cracks in the small concrete hollow block wall.

Question 58: Defects of concrete small hollow block core column

Section 3 Masonry Works

Question 59: Stone masonry engineering materials do not meet the requirements.

Question 60 "Double skin" appears when the wall is assembled.

Question 6 1 In the rubble brick composite wall, the connection between rubble masonry and brick masonry is not firm.

Problem 62: Poor internal and external ties of stone retaining wall.

The fourth quarter reinforced masonry engineering

Question 63: Absence and Corrosion of Masonry Reinforcement

Question 64: The connection between brick wall and constructional column does not meet the requirements.

Honeycomb, holes and exposed bars appear in the concrete of constructional column.

Question 66: The compressive strength of reinforced masonry is too low.

Question 67. Horizontal steel bars are placed in disorder.

Question 68: The arrangement of steel bars in reinforced block masonry is unreasonable.

Section 5 Filled Wall Masonry Project

Problem 69 Poor management of masonry materials for infilled walls

Question 70: The connection between the Rachel reinforcement of the infilled wall masonry and the main frame does not meet the requirements.

Question 7 1 There are many cracks in the filling wall of lightweight aggregate concrete small hollow block.

Problem 72: The infilled wall has poor integrity.

Problem 73: The infilled wall is poorly connected with frame columns and beams.

Chapter IV Concrete Structure Engineering

The first section template engineering

Question 74: The template is damaged

Question 75 Improper use of release agent

Question 76. The setting of template embedded parts and reserved holes is unreasonable.

Question 77: The time for formwork removal of cast-in-place concrete structure is unreasonable.

Question 78 Damage to formwork and concrete caused by dismantling formwork

In the second quarter reinforcement engineering

Question 79: The column section is insufficient after replacing the steel bar.

Question 80: Surface corrosion of steel bars

Question 8 1 after cold drawing, cracks and delamination appear on the surface of steel bar.

Question 82: After spot welding of steel bar, the welding spot does not meet the requirements.

Question 83 Eccentricity and Bending of Reinforced Joint in Pneumatic Welding

Question 84: Defect of steel wire sleeve for tapered threaded connection

Question 85: The binding or installation of steel skeleton is not standardized.

Question 86: The stirrup spacing or quantity in the binding beam is wrong.

Section 3 Prestressed Engineering

A question 87 The surface quality of prestressed steel wire and stranded wire is unqualified.

Problem 88: The screw end rod is deformed or broken.

Question 89: There is an error in the blanking of prestressed tendons.

Question 90: The laying of unbonded prestressed tendons is not standardized.

Question 9 1 The tensioning of prestressed tendons violates the tensioning sequence.

Question 92: The prestressed tendons are not firmly combined with concrete members.

The fourth quarter concrete engineering

Question 93: The quality of concrete raw materials is unqualified.

Question 94: The quality control of concrete is not strict.

Question 95: The quality of cement is unqualified.

Question 96 Improper use of additives

Question 97: Poor concrete mix ratio.

Question 98: Concrete is layered and isolated.

Question 99: The quality of concrete pouring is unqualified.

Problem 100 Improper construction position of basement and trench.

Section 5 Cast-in-situ Structural Engineering

Problem/The construction quality of KLOC-0/0L cast-in-place beam slab concrete is unqualified.

Problem 102 The dimensions of the section and axis of the component do not meet the design requirements.

Question 103 The center line of concrete members and embedded parts is inclined to the positioning axis.

Problem 104 Appearance defect of cast-in-place structure

Section 6 Precast Structure Engineering

Question 105 The fabrication size of fabricated formwork is out of tolerance.

Problem 106 Deformation of Assembled Concrete Columns

Problem 107 The fabricated concrete crane beam is unqualified.

Question 108 The size of assembled concrete roof truss does not meet the design requirements.

Problem 109 Parts assembled during storage were damaged.

Problem 1 10 Displacement and deviation of components after hoisting.

Chapter V Wood Structure Engineering

Section 1 Timber and Log Structure Engineering

Problem 1 1 1 The material of wood members does not meet the quality requirements.

Problem 1 12 The moisture content of wood does not meet the requirements.

Problem 1 13 wood truss height is out of tolerance.

Question 1 14 wood truss's teeth are not tight.

Question 1 15 displacement and deflection of wooden frame hoisting.

Problem 1 16 When the wooden keel of the roof is installed, the splicing of the keel is not standardized.

Section 2 Glued Wood Structure Project

Problem 1 17 plywood has poor water resistance and durability.

Problem 1 18 The bonding strength of the bonded parts is insufficient.

Problem 1 19 plywood is unqualified.

Section 3 Light Wood Structure Engineering

Problem 120 The bearing capacity of light wooden shear wall structure is insufficient.

Problem 12l light wooden floor structure does not meet the design requirements.

Problem 122 The nail connection of transitional wood structure does not meet the requirements.

Chapter VI Building Roof Engineering

The first section coiled material waterproof roofing project

Problem 123 Cracking of cement mortar leveling layer

Problem 124 Poor drainage of leveling layer

Problem 125 The leveling layer is polished off.

Problem 126 Poor drainage of inverted roof

Problem 127 The moisture content of thermal insulation material is too high.

Problem 128 Loose insulation material particles are too large or too small.

Problem 129 Uneven thickness of loose material insulation layer

Problem 130 The slab insulation layer is unevenly laid.

Problem 13 1 When laying coiled materials by cold bonding method, the waterproof layer of coiled materials aged or fell off prematurely.

Problem 132 When the coil is laid by hot melt method, the coil bulges or is not firmly bonded.

Problem 133 Detailed structural leakage

In the second quarter coating waterproof roofing project

Problem 134 The coating film is not firmly bonded, peeling and cracking.

Problem 135 Improper handling of base course of coated waterproof roof.

Problem 136 The protective layer material of coated waterproof roof falls off.

Section 3 Rigid Waterproof Roofing Project

Problem 137 The isolation effect of rigid waterproof roof isolation layer is poor.

Problem 138 Cracking of Rigid Waterproof Roof

Problem 139 rigid waterproof roof waterproof shell and sand.

Problems 140 cracks, honeycomb, peeling, etc. Occurs at the bottom of the waterproof part of the seal.

Problem 14 1 Poor deformability after filling sealing material.

Problem 142 The sealing material is damaged or contaminated.

The fourth quarter tile roofing project

Problem 143 flat tile roof leaks.

Problem 144 Flat tile roof tiles fall off.

Problem 145 Leakage of linoleum tile roof

Problem 146 leakage of metal plate roof

Section 5 Thermal Insulation Roofing Project

Problem 147 Poor drainage and leakage of overhead roof.

Problem 148 Water storage roof leakage

Problem 149 leakage of planting roof

Section 6 Detailed Structural Engineering

Problem 150 Local water accumulated in the gutter and eaves gutter.

Problem 15 1 leakage at overflow node

Problem 152 Leakage of deformation joints and impinges ports.

Problem 153 Leakage around pipes protruding from the roof

Chapter VII Underground Waterproof Works

The first section underground building waterproof engineering

Problem 154 Water seepage of underground waterproof concrete

Problem 155 Insufficient performance of underground waterproof concrete.

Problem 156 The mix design of waterproof concrete is unreasonable.

Question 157 After pouring waterproof concrete, the surface did not take corresponding maintenance measures.

Problem 158 There is a through crack with a width greater than 0.2mm in the waterproof concrete structure.

Problem 159 Empty drum and water seepage occurred at the base of cement mortar waterproof layer.

Problem 160 Sand on the surface of waterproof layer of cement mortar

Problem 16 1 The waterproof layer of multi-layer plastered cement mortar has poor waterproof effect.

Problem 162 Improper selection of waterproofing materials for coiled materials.

Problem 163 Insufficient lap width of underground waterproofing membrane

Problem 164 The waterproof layer of the coiled material was damaged and lost its waterproof function.

Problem 165 Empty drum of coiled material waterproof layer

Problem 166 Leakage occurred in the main structure of underground engineering.

Problem 167 Surface Defects of Coating Waterproof Layer

Problem 168 The coating waterproof layer is damaged.

Problem 169 Deformation or damage of plastic waterproof layer in underground engineering

Problem 170 Deformation of metal plate waterproof layer or anchor pull-off of metal plate in underground engineering.

Problem 17 1 Poor welding quality of metal plate waterproof layer in underground engineering.

Problem 172 leakage of construction joints

Problem 173 Power line leakage

Problem 174 Leakage of embedded parts

In the second quarter special construction method of waterproof engineering

Problem 175 The waterproof ability of sprayed concrete is poor.

Problem 176 The installation and construction of anchor rod is not standardized.

Problem 177 Surface water seeped into the tank, causing the tank section to collapse.

Problem 178 Mud quality control omission

Problem ]79 Diaphragm Wall has poor integrity.

Problem 180 The groove wall collapsed during the hoisting of the reinforcing cage.

Problem 18 1 Incomplete Diaphragm Wall Interface

Problem 182 Cracks in the Secondary Lining

Problem 183 Composite lining affects the normal use of communication, power supply and other equipment.

Problem 184 Water leakage in shield tunnel

Problem 185 Leakage of deformation joint of double lining

Section 3 Drainage Works

Problem 186 The seepage and drainage layer is blocked.

Problem 187 The drainage function of the seepage drainage layer is poor.

Problem 188 The drainage effect of buried pipe blind ditch is poor.

Problem 189 The drainage effect of blind ditch without pipe is poor.

Problem 190 The quality of geosynthetics is unqualified.

Problem 19 1 The drainage ditch in the tunnel is unreasonable.

Problem 192: The open drain of wall lining is unreasonable.

Problem 193 The drainage structure of the external lining of the wall is unreasonable.

The fourth quarter grouting engineering

Problem 194 Improper selection of grouting materials

Problem 195 Abnormal grouting

Problem 196 poor grouting effect.

Problem 197 Improper selection of grouting materials for lining cracks.

Problem 198 The arrangement of grouting holes is unreasonable.

Problem 199 Grouting nozzle is not buried correctly.

Question 200 Defects in Grouting Construction

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