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Engineering Construction Standard Full-text Information System
Construction Industry Standard of the People's Republic of China JG/T 3028—1995
Exhaust chimney flue for residential kitchen
Exhaust chimney flue for residential kitchenConstruction Standard
1995-10-16Promulgated
Ministry of Construction of the People's Republic of China
Implementation on 1996-05-01
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Construction Industry Standard of the People's Republic of China Exhaust chimney flue for residential kitchenSubject Content and Scope of Application
JG/T3028—1995
This standard specifies the classification, specifications and dimensions, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage requirements for kitchen exhaust ducts for multi-story and low-rise residential buildings. This standard applies to smoke exhaust duct products made of concrete or lightweight aggregate concrete materials for coal-fired stoves in residential kitchens with non-mechanical smoke exhaust. Smoke exhaust ducts for residential buildings with decentralized heating using coal as fuel can be used as a reference. 2 Reference standards
GBJ175
GB9978
GBJ107
GBJ204
GBJI19
General purpose low carbon steel wire
Ordinary low carbon steel hot rolled coil round bar
Portland cement, ordinary Portland cement
Fire resistance test method for building components
Concrete strength test and evaluation standard
Reinforced concrete Engineering construction and acceptance specifications Technical specifications for the application of ordinary concrete admixtures Technical specifications for lightweight aggregate concrete
JGJ52 Quality standards and test methods for sand used in ordinary concrete JGIL53 Quality standards and inspection methods for crushed stone or pebbles used in ordinary concrete 3 Terms
3.1 Coal-fired stove
A stove that uses coal as the main fuel and is mainly used for cooking 3.2
Smoke exhaust duct
Refers to the channel for exhausting smoke generated by the coal-fired stove. 3.B Main flue
A shared smoke exhaust channel connected to the branch flue of each kitchen on each floor at the same vertical position. 3.4 Branch flue
A smoke exhaust channel connecting the coal-fired stove and the main flue for each floor. 3.5 Single flue
A smoke exhaust channel used by the coal-fired stove in each kitchen on each floor to exhaust smoke into the roof atmosphere. 3.6 Main and branch flues
Integrate the main and branch flues into one, discharge the smoke generated by the coal-burning stoves in the kitchens on each floor into the main flue through the branch flue at the same vertical position, and then discharge the smoke into the atmosphere through the main flue. 3.7 Main and branch partitions
Approved by the Ministry of Construction of the People's Republic of China on October 16, 1995 and implemented on May 1, 1996
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The partition between the main flue and the branch flue in the main and branch flues. 4 Classification and model
4.1 Classification of exhaust duct products
4.1.1 According to the different system structures composed of the exhaust duct, the exhaust duct is divided into the main and branch (PYZ) type in which each household uses branch flues to share the main flue and the single (PYD) type in which each household has its own flue. The structure of the exhaust duct system is shown in Appendix A (reference). 4.12 Smoke exhaust ducts are divided into three types according to the length of each section: 0.9, 1.0m and three types based on the length of the floor height (H), with the codes 09; 10; 27, 28, 29, and 30 respectively.
4.1.3 Smoke exhaust ducts are divided into three types according to the direction of the smoke inlet, with the codes L, R, and F. L means the smoke inlet is on the left, R means the smoke inlet is on the right, and F means the smoke inlet is in the front. When there is no such symbol, it means no item. The direction of the smoke inlet is stipulated in Figure 1.4.1.4 Each section of the smoke exhaust duct is divided into four types according to the installation position in the system, with the codes 1, 2, 3, and 0 respectively. 1, 2, and 3 respectively indicate the smoke ducts located at the bottom, middle, and top of each floor when each floor is assembled in sections. When the code is 0, it means that each floor is a full-length smoke duct. Smoke inlet
Smoke inlet!
Main flue
Code L
Marking method
Branch flue
Smoke inlet
Main flue
Code R
Figure 1 Smoke inlet direction regulations
Branch flue
Main flue
Code F
4.2.1 Smoke exhaust duct products shall be marked according to the system structure, length, installation position and smoke inlet direction. The marking method is as follows: Main parameters (length of each flue section Jm)
Structural characteristic code (installation position: 1, 2, 3, 0, smoke inlet direction: L, R, F)
Product name code (PYZ, PYD)
4.2.2 Marking example
Each layer is assembled in sections, with a length of 0.9m, located at the bottom, with the smoke inlet between the coal stove and the branch flue on the left side. Main branch flue: PYZ-—1L09JG/T3028—-1995
Each layer is a full-length flue , length is 2.7m, single type flue with smoke inlet located in front of the flue: PYD-0F27JG/T3028—1995
4.3 Basic structural dimensions of exhaust duct
4.3.1 External dimensions
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4.3.1.1 The elevation and surface drawings of PYZ type exhaust duct are shown in Figure 2. 4.3.1.2 The elevation and cross-section drawings of PYD type exhaust duct are shown in Figure 3. 4.3.2 The cross-sectional dimensions of the exhaust duct shall comply with the provisions of Table 1. The determination of the flow cross section of the exhaust duct is shown in Appendix B (reference). The smoke inlet connecting the coal-fired stove and the branch flue shall not be less than 0.010m24.3.3
The cross-sectional area of the smoke outlet connecting the branch flue and the main flue shall not be less than the flow cross-sectional area of the branch flue. Figure 2 PYZ type smoke exhaust duct elevation, section diagram
Figure 3 PYD type smoke exhaust duct elevation, plane diagram
4.3.5 When the smoke exhaust duct flow cross section is rectangular, its minimum side length should not be less than 100mm. Technical requirements
PYZ type
PYD type
5.1 Materials
5.1.1 Cement
Wall thickness:
Smoke exhaust duct cross-sectional dimensions
Smoke duct cross-sectional dimensions
Outer dimensions, mm
Long side a
≤500
≤300
≤300
Cement of not less than No. 425 should be used, and its performance should meet the requirements of GBJ175. 5.1.2 Steel bars
Cross-sectional area of the flow, m2
Main flue
Should use Grade 1 steel bars or cold-drawn carbon steel wire. Its performance should comply with the provisions of GB343 or GB701. 5.1.3 Aggregates
Side flue
Light aggregate and fine stone particle size should not be greater than 1/3 of the wall thickness of the flue, and its performance should comply with the provisions of JGJ51, JGJ52, JGJ53, GBJ204.
The use of admixtures should comply with the provisions of GBJ119. 5.1.4
5.2 Appearance quality
5.2.1 There should be no exposed steel bars, honeycombs, collapse and hollowing on the inner and outer surfaces of the flue products. Engineering Construction Standard Full-text Information System
5.2.2 When the cross-sectional area of the flue flow is rectangular, the corners should be rounded. The reserved smoke inlet in the exhaust duct should be unobstructed and unblocked. 5.2.3 The inner surface of the exhaust duct should be flat and smooth, and no cracks are allowed (but surface cracking and shrinkage cracks in the mortar layer are not limited). 5.2.4 Exhaust ducts with the following conditions are allowed to be repaired: a.
Skin stickiness, pitting, and honeycomb should not exceed 1/20 of the total area; the area of each piece should not exceed 50cm2. If both ends of the flue are damaged, the width should not exceed 1/10 of the side length, and the height should not exceed 100mm. If the main support partition at the end is damaged, the width should not exceed 1/10 of the side length, and the height should not exceed 20mm. 5.3 Allowable size deviation
The allowable size deviation of the exhaust duct shall comply with the provisions of Table 2. 5.3.1
Table 2 Allowable deviation of the dimensions of exhaust duct products
Cross-sectional dimensions
First-class products
Qualified products
5.3.2 The two end faces of the exhaust duct shall be perpendicular to the central axis of the flue. Physical properties
5.4.1 Concrete
Main flue
Branch flue
The strength grade of lightweight aggregate concrete and fine stone concrete shall generally not be lower than C20. 5.4.2 The water absorption rate of the side wall of the exhaust duct shall not be greater than 16%. 5.4.3 The fire resistance limit of the exhaust duct products shall not be less than 1.2h. 6
Test method
Appearance quality inspection
Visually inspect the inner and outer surfaces of the exhaust duct for exposed reinforcement, honeycombs, hollows and collapse. 6.2 Dimension inspection
6.2.1 The dimensions of the exhaust duct shall be measured with a steel tape measure with an accuracy of 1mm. Wall thickness
Cross-section
±2%oH
6.β.2 The lateral curvature of a flue shall be measured with a special straightness deviation measuring instrument or a metal ruler or wooden ruler with a length not less than the length of the flue.
6.2.3 The verticality of the two end faces and the side of the flue shall be measured with a square. 6.2.4 Cracks shall be measured with a magnifying glass of not less than 20 times. 6.3 Physical and mechanical index test methods
Physical and mechanical index tests include concrete compressive strength, fire resistance, and water absorption tests. 6.3.1 Determination of concrete compressive strength
Concrete compressive strength test shall be carried out in accordance with the method specified in GBJ107. 6.3.2 Water absorption test
6.3.2.1 Sampling test equipment: concrete cutting machine, tray balance (maximum weighing 5kg, sensitivity 1g), cooking pot, drying box. 6.3.2.2 Sampling and test steps: Take two samples with a side length of 50mm at 30mm at both ends of the exhaust duct. Wipe the surface of the sample clean and put it in an oven at a temperature of 105±5℃ for drying. After continuous drying for 6 hours, take it out and weigh it twice in succession. If the loss does not exceed 10%, the weight of the last weighing can be recorded as G1. Then, put it in a clean water container containing 15-25℃ water and heat the water to boiling within 2 hours. After 5 hours, stop heating and let the sample cool down naturally in the water for 20 hours to reach room temperature. After taking it out, quickly wipe off the surface moisture with a wet towel and weigh its weight after water absorption G2. Engineering Construction Standard Full Text Information System
6.3.2.3 The water absorption rate is calculated by the following formula:
Wherein: W-water absorption rate of flue wall;
G1-weight of sample after drying, 8;
G2-weight of sample after water absorption, 8
G2-G1×100%
The average value of the main samples is the water absorption rate of the group of samples. Accurate to 0.1%. 6.3.3 Determination of fire resistance
The fire resistance limit of flue products is determined according to the method specified in GB9978. 7 Inspection rules
7.1 Inspection classification
Product inspection is divided into factory inspection and type inspection. 7.1.1
Factory inspection includes appearance quality, dimensional deviation, concrete compressive strength. Type inspection includes appearance quality, dimensional deviation, concrete compressive strength, fire resistance and water absorption test. Factory inspection
Sampling and batching
Sampling is carried out by random sampling method according to batch. The exhaust ducts of the same specification, the same raw materials and the same process are considered as batches for the products shipped out of the factory. The number of batches divided by different length specifications is shown in Table 3. When the total number of exhaust ducts is less than one batch, it is also inspected as one batch. Table 3 Division of the total number of batches for factory inspection
Length of exhaust duct, mm
Total number of product batches, roots
Note: H is the floor height of residential buildings.
7.2.2 Appearance quality inspection
Appearance quality inspection should be carried out one by one. 7.2.3 Dimension deviation inspection
Twenty exhaust ducts are sampled from each batch of products for inspection. If more than 4 (including 4) exhaust ducts are unqualified, the batch is judged to be unqualified. 7..4 Concrete strength test
When the concrete mix ratio and the materials used are changed or 100m concrete is used in continuous production, three groups of test blocks with the same curing conditions as the product shall be used for strength test. One group shall be used for demoulding strength test, one group shall be used for design strength test, and the other group shall be used as spare or for factory strength test. 7. b Type test
Type test shall be carried out in any of the following situations: production finalization appraisal of new products (or conversion of old products); after formal production, if there are major changes in structure, materials, and processes that may affect product performance; in normal production, regular inspections or after a certain number of products have been accumulated, and after the product has been discontinued for more than half a year and resumed; when the factory inspection results are significantly different from the previous type inspection; when the national quality supervision agency proposes a type inspection requirement; when each length specification product has been produced continuously for half a year or the cumulative number reaches the number specified in Table 4. bzSoeO,coMa Engineering Construction Standard Full Text Information System
Length of smoke exhaust duct, mm
Total number of products, root
Note; H-storey height of residential building.
Table 4 Total number of products for type inspection
7.3.2 Inspection of appearance quality and dimensional deviation is the same as that of 7.2.2 and 7.2.3. 7.3.3 Inspection of concrete strength is the same as that of 7.2.4. 7.3.4 Water absorption test, to be carried out once every three months, or at the same time as type inspection. 7.3.5 Determination of fire resistance limit is carried out at the same time as type inspection. 7.4
Judgment ruleswww.bzxz.net
Products that meet the requirements of 5.2.1~5.2.2, have no defects in appearance and meet the requirements of 5.31~5.3.2 in terms of dimensional deviation, and the concrete strength meets the design requirements, shall be accepted as first-class products. 7.4.2 Any product whose dimensional deviation complies with Articles 5.3.1 to 5.3.2, meets some of the indicators in Articles 5.2.1 to 5.2.2, and has relatively minor defects within the allowable repair range, and whose concrete strength meets the design requirements, can be accepted as qualified products. 7.5 Repair
Any exhaust duct that is accidentally damaged or slightly damaged during manufacturing or transportation can be accepted after effective measures are taken to repair it within the allowable repair range and it meets the technical requirements of this standard and passes the inspection. 8 Marking, packaging, transportation, storage
8.1 Marking and factory certificate
8.1.1 Product marking
The product surface should be painted with waterproof paint to indicate the type, specification, grade, manufacturing period and manufacturer mark on the flue products. The expression method is as follows:
Manufacturer name-product code-grade-manufacturing date. Example: Shenyang Northern Flue Factory PYZ-1R09 first-class product 90.7.188.1.2 Factory certificate
For all products that have passed the inspection and are allowed to leave the factory, the factory certificate should be filled in. When shipping, the factory certificate must be sent to the user along with the delivery note, which should include:
Certificate number;
Manufacturer name and manufacturing date;
Product specifications and quantity;
Product test results;
Stamp of the inspection department of the manufacturer, and the seal of the inspection officer. 8.2 Packaging
To prevent damage to the exhaust duct, its two ends should be wrapped with soft fabric or straw rope. 8.3 Transportation
Transport by various means of transportation. When loading and unloading the exhaust duct, it should be gently lifted and placed during the loading and unloading process, and throwing is strictly prohibited. It should be fixed during transportation to reduce vibration and prevent collision. 8.4 Storage
The stacking site of the smoke exhaust duct must be solid and flat, and smoke exhaust ducts of different specifications should be stacked separately. The stacking height should not exceed 2m. bzSoO,coCurrent Engineering Construction Standard Full-text Information System
Appendix A
Composition of residential kitchen smoke exhaust duct system
(reference)
A1 The smoke exhaust duct system composed of smoke exhaust ducts is shown in Figure A1 and Figure A2. 0
Main smoke duct
7777772
Smoke inlet
Ash removal outlet
Smoke inlet
Branch smoke duct
Smoke outlet
Flush brick Table
Figure AIPYZ type smoke exhaust duct system diagram
Main smoke duct
Smoke inlet
Main smoke duct
Smoke inlet
Smoke brick table
Smoke brick table
Figure A2PYD type smoke exhaust duct system diagram
A1.1The smoke exhaust system composed of PYZ type smoke exhaust duct, smoke enters the main smoke duct from the smoke delivery port along the branch smoke duct through the smoke outlet of the branch smoke duct connected to the main branch, and then from the main smoke duct to the roof and discharged into the atmosphere. The top floor exhaust is directly discharged into the atmosphere by the branch smoke duct. The smoke exhaust system composed of PYD type smoke exhaust duct is directly discharged into the atmosphere by the smoke exhaust channels of each floor directly to the roof. A1.2When the number of residential floors is three or more (including three floors), PYZ type smoke exhaust duct should be used. A2 Local dimensions of the exhaust duct system
A2.1 The position of the smoke inlet connecting the exhaust duct and the stove should be determined according to the design. The height of the exhaust duct from the roof should adopt the dimensions marked in Figures A1 and A2.
A2.2 The bottom of the exhaust duct system should be built with a brick platform, and the height of the brick platform should be 300mm, which can also be determined according to the design. A2.3 The PYz type exhaust duct system should be equipped with an ash removal port in the bottom brick platform, and the area of the ash removal port should not be less than 120mmX120mm. bzsos,com Engineering Construction Standard Full Text Information System
A3 Assembly of the exhaust duct system
A3.1 The bottom exhaust duct should be installed on the brick platform. When installing layer by layer, the interface of each section of the exhaust duct must be tightly mortared. The strength grade of the mortar used shall not be lower than M5 grade.
A3.2 When assembling the exhaust duct on each floor, the branch flue should be partitioned, and the partition should be blocked with bricks and sealed with mortar. A3.3 When installing the exhaust duct, two No. 8 galvanized iron wires should be tightly wound around the two ends of each section of the flue to anchor it to the adjacent wall to maintain lateral stability. The installation should be strictly carried out according to the position of the product number. A34 Appendix B Determination of the smoke flow section of the exhaust duct (reference) The smoke flow resistance of the exhaust duct system is calculated according to formula (B1): H Where: H is the resistance of the exhaust duct system, Pa; in is the resistance coefficient along the way; l is the length of the exhaust duct segment, m; w is the smoke flow velocity of the exhaust duct, m/s; p is the smoke density, kg/m; 8 is the local resistance coefficient; tt is the equivalent diameter of the smoke flow section of the exhaust duct, m, when the flow section is circular, a. d, when the flow section is rectangular; dor
circular flow section diameter, m;
a-long side of rectangular flow section, m
b-short side of rectangular flow section, m.
B2The natural lift of smoke exhaust is calculated according to formula (B2): H.=hyg
0.7734+353.196
Where: H.-natural lift of smoke exhaust, Pa; h, height of smoke exhaust system, m;
g-gravitational acceleration, m/s2;
t-outdoor air temperature, ℃;
t-average smoke temperature, ℃.
B3 When determining the flow cross-section of the smoke exhaust duct, the flow resistance of the smoke exhaust system and the natural lift caused by the smoke generated by the coal combustion should satisfy the provisions of formula (B3):
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Additional Notes:
This standard is proposed by the Ministry of Construction of the People's Republic of China. H.≥H,
This standard is under the jurisdiction of the China Building Standard Design Institute, the technical unit responsible for building products and equipment standards of the Ministry of Construction. This standard was drafted by Shenyang Institute of Architecture and Civil Engineering and the Urban Housing Research Institute of the Ministry of Construction. This standard is entrusted to the China Building Standard Design Institute for interpretation. (B3)
The main drafters of this standard are Huang Zhigang, Lin Runquan, Ma Shiming, Wang Yueren, Zhang Wanqing, Ma Shulian, Jiang Zhongyi, Wu Yunfu, Wang Yongbin, Li Yuming, and Hao Xuejun.
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