This specification is applicable to the safety technology, labor protection and fire prevention requirements of brick chimney and reinforced concrete chimney engineering and other sub-projects and construction. In addition to this specification, it should also be implemented in accordance with the relevant national regulations. GBJ 78-1985 Chimney Engineering Construction and Acceptance Specification GBJ78-1985 Standard Download Decompression Password: www.bzxz.net

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National Standard of the People's Republic of China
Code for Construction and Acceptance of Chimney Project
GBJ78-85
1985Beijing
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National Standard of the People's Republic of China
Code for Construction and Acceptance of Chimney Project
GBJ78-85
Editor Department: Ministry of Metallurgical Industry of the People's Republic of ChinaApproval Department: State Planning Commission of the People's Republic of ChinaImplementation Date: March 1986| |tt||Engineering Construction Standard Full Text Information System
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Notice on the Release of "Smoke Window Engineering Construction and Acceptance Specification"
Ji Biao [1985] No. 1208
According to the notice of the former State Construction Commission (81) Jianfa She Zi No. 546, the "Smoke Window Engineering Construction and Acceptance Specification" GBJ7-64, which was revised by the Ministry of Metallurgical Industry and relevant departments, has been reviewed by relevant departments. The revised "Smoke Window Engineering Construction and Acceptance Specification" GBJ78-85 is now approved as a national standard and will be implemented on March 1, 1986. This specification is managed by the Ministry of Metallurgical Industry, and its specific interpretation and other work are the responsibility of the Industrial Furnace Engineering Company of the Second Metallurgical Construction Company of the Ministry of Metallurgical Industry of Baotou City. The publication and distribution is organized by the Basic Construction Standard and Quota Research Institute of our Commission. State Planning Commission
August 12, 1985
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Revision Notes
This specification is based on the notification of the former National Capital Construction Committee (81) Jianfa Shezi No. 546, and the Second Metallurgical Construction Company of our Ministry of Industry and Furnace Engineering, together with relevant units, formed a revision group to jointly revise the original "Cigarette Construction and Acceptance Specifications GBJ7-64". During the revision process, the revision group summarized the experience and lessons of cigarette construction in the implementation of the original specification for more than ten years, conducted relatively extensive investigations and research, necessary tests and verifications, and solicited opinions from relevant units across the country. After repeated revisions, it was finally reviewed and finalized together with relevant departments.
This specification is divided into nine chapters, 135 articles and two appendices. The main revisions include: adding new technologies, new processes, and new materials such as sliding formwork, thin shell foundation, acid-resistant concrete, refractory concrete, water reducing agent, and film curing agent, and revising some engineering quality standards, the scope of use of limestone, and the lap length of steel bars; adding a chapter on construction safety in view of the characteristics of high-altitude operations in smoke window projects; and deleting outdated regulations in the original specification.
With the development of my country's four modernizations, new technologies, new processes, and new materials will continue to emerge. It is hoped that all units will pay attention to accumulating information and summarizing experience in the process of implementing this specification, and send the opinions that need to be revised or supplemented to the Industrial Furnace Engineering Company of the Second Metallurgical Construction Company of our department in Baotou City as a reference for future supplementary revisions. Ministry of Metallurgical Industry
February 1985
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Chapter 1
Chapter 2
Chapter 3
Chapter 4
Brick Smokestack Wall
Reinforced Concrete Smokestack Wall
Section 1
Section 2
Section 3
Section 4
Section 5
Chapter 5
Chapter 6
Chapter 7
General Provisions
Concrete
Quality Standards
Inner Lining and Insulation Layer
Smokestack Accessories
Winter Construction
Section 1|| tt||Section 2
Section 3
Section 4
Section 5
Chapter 8
General Provisions
Brick Chimney Wall
Reinforced Concrete Chimney Wall
Project Acceptance
Chapter 9
Construction Safety
Appendix—
Smoke Brine Drying
Appendix 2 Explanation of Terms Used in This Code
Additional Notes·
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·(11)
：(18)
·(23)
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Chapter 1 General Provisions
Article 1.0.1 This code applies to the construction and acceptance of brick chimney and reinforced concrete chimney projects.
The earthwork, masonry, reinforced concrete, anti-corrosion Article 1.0.2
and other sub-projects and construction safety technology, labor protection and fire prevention requirements of the chimney project shall be implemented in accordance with this code and the relevant national regulations in force. Article 1.0.3 The raw materials, semi-finished products and finished products used in the chimney project must have a technical inspection certificate. All raw materials that exceed the prescribed inspection period or are likely to deteriorate must be re-inspected and inspected before they can be used. Engineering Construction Standard Full Text Information Systemwww.bzxz.net
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Chapter 2 Foundation
Article 2.0.1 After the foundation pit of the chimney foundation is dug, the construction unit shall, together with the construction, design and other relevant units, check whether the coordinates of the center of the foundation pit, the size and elevation of the base meet the design requirements; whether the foundation soil meets the exploration data used in the design. If not, the construction unit and the design unit shall propose a solution. The foundation pit should be accepted before the next construction process can be carried out. Article 2.0.2 When the foundation pit is below the groundwater level, effective measures to lower the groundwater level or drain water should be taken according to the hydrogeological conditions before digging the foundation pit. And surface water should be prevented from flowing into the foundation pit.
The measures to lower the groundwater level or drain water in the foundation pit should be continued until the backfill soil is backfilled above the groundwater level before stopping.
Article 2.0.3 The surface of the base should be flat. For individual low-lying areas slightly lower than the design elevation, leveling can be done when pouring the cushion concrete. Article 2.0.4 After the foundation pit is accepted, the foundation should be poured in time. If the foundation is poured again after a long pause after the excavation, the surface of the foundation pit should be rechecked. When the foundation is damaged, the construction and design units should be asked to determine the corresponding remedial measures. Article 2.0.5 When constructing the soil tire of the M-shaped composite shell foundation, the external dimensions should be accurate and the original soil structure should not be damaged. After the soil base is completed, a 25-30 mm thick 1:3 cement mortar surface layer should be applied on its surface. Article 2.0.6 The longitudinal steel bars of the cylinder wall inserted into the foundation ring wall should be accurately tied or welded to the foundation steel bars according to the position, grouping and insertion depth required by the design, and measures should be taken to prevent the displacement of the steel bars.
Article 2.0.7 The location of the foundation construction joint should comply with the following provisions (Figure 20.7):
1. The concrete of the foundation bottom plate should be poured continuously at one time, and the construction joint of the annular and circular plate foundation can be left at the connection between the bottom plate and the ring wall; Engineering 2 Construction Standard Full Text Information System
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2. The shell foundation concrete should be poured continuously at one time according to the horizontal layer, and no construction joints should be left. For the combined shell foundation of the positive and inverted cone and truncated cone, when it is really difficult to pour it in one time, the location of the construction joint should be agreed upon by the construction unit and the design unit. E
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Figure 2.0.7 Schematic diagram of the location of foundation construction joints a-ring plate foundation
b-circular plate foundation
c-truncated cone combined shell foundation
d-positive and inverted cone combined shell foundation
eM-shaped combined shell foundation
1-simple wall 2-ring wall 3-bottom plate
4-ring beam 5-shell 6-ring plate
A-A construction joint
Article 2.0.8
After the foundation is completed, the foundation should be inspected and the foundation pit backfilled in time. The backfill soil should be compacted layer by layer.
Article 2.0.9 The allowable deviation of the foundation position and size should not exceed the value shown in Table 2.0.9.
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Allowable deviation of foundation position and size
Displacement of foundation center point to design coordinates
Elevation of upper surface of ring wall or ring beam
Thickness of ring wall
Thickness of shell
Inner radius of ring wall or shell
Local unevenness of inner surface of ring wall or shell (along radial direction)
Outer radius of bottom plate or ring plate
Thickness of bottom plate or ring plate Degree
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Table 2·0·9
Allowable Deviation Value
1% of the inner radius, and not more than 40mm
1% of the inner radius, and not more than 40mm
1% of the outer radius, and not more than 50mm
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Chapter 3 Brick Smoke Window Barrel Wall
Article 3.0.1 The brick smoke window barrel wall shall be built with standard or special-shaped first-class ordinary clay bricks, and its grade shall meet the design requirements. When there is a requirement for frost resistance, the frost resistance index of the brick shall meet the design requirements. Bricks laid on the outer surface of the barrel wall shall be selected without cracks and at least one end shall have complete edges and corners.
Article 3.0.2 When constructing at room temperature, the bricks shall be watered and moistened in advance, and their moisture content should be 10~15%.
Article 3.0.3 Before laying the cylinder wall, the flatness of the foundation ring wall or the upper surface of the ring beam should be checked, and 1:2 cement mortar should be used to smooth it. The horizontal deviation shall not exceed 20 mm, and the thickness of the mortar leveling layer shall not exceed 30 mm. Article 3.0.4 The mix ratio of masonry mortar shall be weight ratio, and its consistency is 810 cm.
Mortar should be used as soon as it is mixed. Cement mortar and cement mixed mortar must be used within 3 hours and 4 hours after mixing respectively; if the maximum temperature during construction exceeds 30℃, it must be used within 2 hours and 3 hours after mixing respectively. Article 3.0.5 The cylinder wall should be built with top bricks. When the outer diameter of the cylinder wall is greater than 5 meters, it can also be built with staggered bricks and top bricks. Article 3.0.6 When the thickness of the cylinder wall is not less than 1 brick, half bricks can be used for the inner and outer layers. However, broken bricks smaller than 1/2 brick shall not be used. Article 3.0.7 The circumferential joints of the upper and lower layers of masonry should be staggered by 1/2 bricks, and the radial joints should be staggered by 1/4 bricks (special-shaped bricks should be staggered by 1/2 of their width). Article 3.0.8 The vertical mortar joint width and horizontal mortar joint thickness of masonry should be 10 mm. In the 5 square meters of masonry surface, 10 places are randomly checked, and only 5 of them are allowed to increase the mortar thickness by 5 mm.
Article 3.0.9 The mortar joints of the cylinder wall masonry must be full. The fullness of the horizontal mortar joints shall not be less than 80%. The vertical mortar joints should be filled with mortar by squeezing and adding mortar, and it is strictly forbidden to use water to grout the joints.
The external mortar joints of the simple wall should be grouted, and the grouting mortar should be 1:1.5 cement mortar mixed with fine sand. The internal mortar joints should be scraped flat. Article 3.0.10 The masonry brick layer can be built horizontally or tilted toward the center of the smoke window, and its inclination should be equal to the slope of the outer surface of the cylinder wall. Article 3.0.11 The verticality and radius of the center line of the smoke pattern should be checked every 1.25 meters of masonry. The deviations found should be gradually corrected during the masonry process. Article 3.0.12 When ordinary clay bricks are processed into special-shaped bricks for top masonry, they should be processed on one side of the brick. The width of the small head after processing should not be less than 2/3 of the original width. The outer surface of the cylinder wall after masonry, the concave and convex of the brick corners shall not exceed 5 mm. Article 3.0.13 When the cylinder wall is equipped with steel bars, the position, joints and anchorage of the steel bars shall meet the design requirements.
Article 3.0.14 When building the cylinder wall, a group of mortar test blocks should be taken every 5 meters in height. When the mortar grade or mix ratio is changed, another test block should be taken to test its strength at 28 days of age.
Article 3.0.15 The hoops on the cylinder wall should be installed horizontally, and the positions of the joints should be staggered along the height of the cylinder wall.
The hoops should be painted with anti-rust agent before installation.
Article 3.0.16 When installing the hoops, the bolts should be tightened only after the masonry mortar strength reaches 40% to make it close to the cylinder wall. Article 3.0.17 The allowable deviation of the verticality of the center line of the brick chimney should not exceed the value in Table 3.0.17.
Article 3.0.18
The allowable deviation of the masonry size of the cylinder wall of the brick chimney diagram should not exceed the value in Table 3.0.18.
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