GB 12987-2008Concrete hollow floor slab and complete sets for village constructs (English PDF)

Foreword

Chapter 5 of this standard is mandatory, the rest are recommended.

This standard replaces GB 12987-1997 "rural housing hole with concrete board" and GB 15230-1994 "concrete supporting rural housing member." the main differences between this standard and GB 12987-1997 and GB 15230-1994 are.

Name --- standard was revised to "rural construction with a concrete slab and a supporting member hole";

--- Standards include rural construction with concrete hole plate and rural construction with concrete supporting member;

--- Increased introduction;

--- Added some normative references;

--- Modified tag example;

--- Cancel the original standards and classification requirements;

--- Increasing the prestressing requirements (5.4) and the contents of the original national standard GB 12987-1997 included in Appendix A;

--- Factory inspection items unified concrete strength, size and appearance quality deviation;

--- Delivery inspection batch adjusted to GB 50204-2002 consistent quality appearance and size bias is adjusted to the number of test 10;

--- Increasing the compressive strength of concrete project determined the frequency of the sample make provisions, and clearly monthly assessment;

--- Balcony mechanical properties of the beam test method to modify the standard in Appendix A.

Appendix A of this standard is a normative appendix.

The standard proposed by China Building Materials Federation.

This standard by the National Standardization Technical Committee cement products (SAC/TC197) centralized.

Introduction

Production and use of rural construction hole with concrete slab and concrete structures, fixtures history for decades, since the beginning of the 1970s, Reinforced concrete hole plate hole prestressed concrete slab, reinforced and prestressed concrete door, window lintels, stair treads, and mixed Balcony concrete beam supporting member is in the countryside, towns built in housing construction has been widely used. In order to regulate rural housing hole with concrete slab and production support member, released in 1991, China's first GB 12987-1991 "rural housing hole with concrete slab," and in 1997 for the revised standard, revised standard GB 12987-1997 "rural housing hole with concrete board"; China issued in 1994 GB 15230-1994 "concrete supporting rural housing member" standard. Rural housing has been released more than a decade with a concrete slab and a supporting member hole standard.

Because of the design specifications, standards-based format and other changes have been made, the original standards for content does not meet the requirements, coupled with the two products are rural construction Concrete component product, test items, and so have many of the same judgment, issued a mandate for this country, requires the integration of these two standards Amendments.

In urban construction, since the building floors high, strict seismic requirements and other reasons, the concrete hole plate has been used less; but in the Rural Construction, Concrete hole plate and the supporting member due to a reasonable structure, easy installation, low construction costs, construction progress fast and so, still is the most important Building materials. As China's construction technology and raising the level of housing construction commonly used to further improve the seismic design of concrete round and the role of the orifice plate supporting member in the Rural Construction will play more and more.

We believe with the national standards of product quality integration amend and enact the implementation of rural construction control board and the hole with concrete supporting member the amount of attention and forcing the production plants around the implementation of the standards authorities, building a harmonious society will have a profound impact, so that Concrete hole plate and the supporting member to better serve new socialist countryside construction.

Rural construction hole with concrete panels and supporting member

1 Scope

This standard specifies the rural construction with concrete hole plate (hereinafter referred to as hole plate) and a supporting member (hereinafter referred to as the supporting member) sub Class, raw materials, technical requirements, test methods, inspection rules, factory certification, marking, storage and transportation.

This standard applies to rural and township construction of housing, offices, school classrooms and other buildings used as a floor, roof and ceiling like hole Concrete panels and doors, window lintels (hereinafter referred to as lintels), balcony cantilever beam (hereinafter referred to as the balcony beams) and stair treads (hereinafter referred to as treads) and other supporting member.

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.

GB 175 Common Portland Cement GB 1499.1 steel reinforced concrete - Part 1. Hot rolled steel GB 1499.2 steel reinforced concrete - Part 2. Hot rolled ribbed bars GB/T 5223 prestressed concrete steel wire GB 8076 concrete admixture GB 13788 cold rolled ribbed bar GB/T 14684 building sand GB/T 14685 building pebbles, gravel GB 50010 Design of Concrete Structures GB/T 50081-2002 ordinary concrete mechanical performance test method standards GB 50119 concrete admixture technical specifications GB 50164 concrete quality control standards Construction quality concrete structures GB 50204-2002 acceptance GB J107 Concrete Strength Inspection and Evaluation Standards JC/T 540 concrete products cold drawn low carbon steel wire JC/T 624 rural housing component quality concrete detection method JGJ55 ordinary concrete mix design procedures JGJ63 concrete water standards JGJ95 cold rolled ribbed bar design concrete structures Category 3

4 Flat-shaped treads shape

Chou --- treads wide;

L --- treads long;

Figure 5 L-shaped treads shape

3.3.2 cross-sectional dimension, nominal length 3.3.2.1 prestressed plate, non-prestressed plate-sectional dimensions, nominal length shall conform to Table 5, Table 6 provides.

3.3.2.2 lintels, beams and balconies treads sectional dimensions, nominal length shall conform to Table 7, Table 8 and 9 as specified in Table.

Table 5 prestressed plate section size and nominal length in millimeters

Sectional dimension

Level of nominal length 490 × 110 590 × 110 I, II, III, IV, V 270030003300 340036003800 490 × 120 590 × 120 I, II, III, IV, V 300033003400 360038004000 420043004500 490 × 130 590 × 130 I, II, III, IV, V 360038004000 420043004500 470048005000

Table 6 non-prestressed plate section size and nominal length in millimeters

Sectional dimension

Level of nominal length 490 × 110 590 × 110 I, II, III, IV, V 270030003300 490 × 130 590 × 130 I, II, III, IV, V 270030003300 340036003800 490 × 150 590 × 150 I, II, III, IV, V 270030003300 340036003800

Table 7 lintel section size and length in millimeters

section

Load length L level

180 × 50

240 × 50

370 × 50

Rectangular I 1100,1200,1300,1400 180 × 60 240 × 60 370 × 60 rectangle I 1100,1200,1300,1400,1500,1600,1700 II 1100,1200 III 1100

Table 7 (continued) millimeters

section

Load length L level

180 × 100

240 × 100

370 × 100

rectangle

I ~ II 1200,1300,1400,1500,1700,1900 III ~ IV 1200,1300,1400,1500,1700 V ~ VI 1100,1200,1300,1400 180 × 120 240 × 120 370 × 120 rectangle I ~ II 1400,1500,1700,1900,2000,2300 III 1300,1400,1500,1700,1900,2000 IV 1100,1200,1300,1400,1500,1700,1900 V 1100,1200,1300,1400,1500,1700 VI 1100,1200,1300,1400,1500 180 × 180 240 × 180 370 × 180 rectangle Two rectangular Two L-shaped I 2000,2300,2600,2900,3200,3500 II ~ III 1900,2000,2300,2600,2900 IV ~ V 1700,1900,2000,2300,2600 VI 1700,1900,2000 180 × 240 240 × 240 370 × 240 rectangle Two rectangular Two L-shaped II ~ III 2600,2900,3200,3500 IV 2300,2600,2900,3200 V 2300,2600,2900 VI 2300,2600 180 × 300 240 × 300 370 × 300 rectangle Two rectangular Two L-shaped IV ~ VI 2900,3200,3500 240 × 100 240 × 150 Two L-shaped I ~ IV 1100,1200,1300,1400,1500,1700 V ~ VI 1100,1200,1300,1400 I ~ IV 1500,1700,1900,2000,2100,2300 V ~ VI 1500,1700 240 × 180 Pumping holes (50 ~ 60) Rectangular I ~ IV 1700,1900,2000 240 × 100 (57) 240 × 160 (102) Prestressed Rectangular I ~ IV 1100,1200,1300,1400,1500,1700 V ~ VI 1500,1700 I ~ IV 1500,1700,1900,2000,2100,2300 V ~ VI 1500,1700,1900 Note. Other designs determined by the design department.

Table 8 balcony beam section size and length in millimeters

species

Sectional dimension

level

length

L1 L

Width balcony

(Bay size)

240 (220) ×

240/120 (150)

2100,2200,2300,2400,2500,2600,2700, 2800,2900 3,000 to 5,000 1400 2900,3000,3100,3200,3300,3400 3000 to 4700 1500 3100,3200,3300,3400,3500 3000-4000 2200,2300,2400,2500,2600,2700,2800, 2900,3000,3100 3,000 to 5,000 1400 2900,3000,3100,3200,3300,3400 3000-4000 1500 3100,3200,3300,3400,3500 3000 to 3600 Single male Beam 240 (220) × 1400 3100,3200,3300,3400 5000 1500 3200,3300,3400,3500,3600 4,000 to 5,000 1400 3100,3200,3300,3400,3500 4200 to 5000 1500 3200,3300,3400,3500,3600 3800 to 5000 240 (220) × 240/120 (150) 240 (220) × 1000 2400,2500,2600,2700,2800,2900,3000 3000-4000 1200 2800,2900,3000,3100 3000 1000 2500,2600,2700,2800,2900,3000,3100 3000 to 3400 1000 2500,2600,2700,2800,2900,3000,3100 4200 to 5000 1200 2800,2900,3000,3100,3200 3300 to 5000 1400 3200,3300,3400,3500,3600,3700 3000 ~ 5000 1500 3400,3500,3600,3700,3800,3900 3000 ~ 5000 2500,2600,2700,2800,2900,3000,3100, 3600 to 5000 1200 2900,3000,3100,3200 3000-5000 1400 3300,3400,3500,3600 3000-5000 1500 3700,3800,3900,4000 3000-5000

Note 1. The brackets 220 are cross-sectional width of non-standard bricks dependent.

Note 2. Other specifications need to design determined by the design department.

Table 9 treads section size and length in millimeters

Category Level

Sectional dimension

length

Flat I, II 250 ~ 350 40,50 - 1000 ~ 1400 L plate I, II 240 ~ 320 150 ~ 200 40 1000 ~ 1400 Prestressed L plate I, II 240 ~ 320 150 ~ 200 35 1000 ~ 1400 Note. Other specifications to be determined by the design department design.

3.3.3 Size of

3.3.3.1 prestressed plate structure size Table 10.

Table 10 prestressed plate structure size in millimeters

Sectional dimension

Hole

Holes aperture

490 × 110 5 70 20 20 590 × 110 6 70 20 20 490 × 120 5 (4) 76 (80) 22 22 590 × 120 6 (5) 76 (80) 22 22 490 × 130 5 (4) 76 (80) 25 29 590 × 130 6 (5) 76 (80) 25 29

Note 2. The agreement between can also produce other specifications size of the hole plate.

3.3.3.2 Non-prestressed plate structure size Table 11.

Table 11 Non-prestressed plate structure size in millimeters

Sectional dimension

Hole

Holes aperture

490 × 110 5 70 20 20 590 × 110 6 70 20 20 490 × 130 5 76 25 29 590 × 130 6 76 25 29 490 × 150 4 108 20 22 590 × 150 4 108 20 22

Note 2. The agreement between can also produce other specifications size of the hole plate.

3.4 mark

Hole plate, supporting member of the lintel and the plate-shaped concrete stepping plate varieties, length × width × height, grade, standard number Choreography.

Supporting member balcony Leung varieties, length × width × height balcony beam/tip height, grade, standard number choreography.

Supporting member of the L-shaped treads and prestressed concrete L-shaped stepping plate varieties, length × width × height × thickness, grade no, the standard number choreography. Tag example as follows.

Nominal length of 3800mm, a nominal width of 500mm, a height of 110mm, II grade level farm house with prestressed concrete round Orifice labeled as follows.

NYKB 3800 × 500 × 110 II GB 12987-2008 A length of 3400mm, width of 240mm, height of balcony beam 240mm, tip height of 150mm, loads of level I Balcony beam labeled as follows.

YTL 3400 × 240 × 240/150 I GB 12987-2008 A length of 1000mm, width of 320mm, a height of 150mm, thickness of 35mm, grade level I prestressed L-shaped stepping Board labeled as follows.

YLTB 1000 × 320 × 150 × 35 I GB 12987-2008 4 raw materials

4.1 Production and hole plate supporting member should adopt the intensity level of not less than 42.5 Common portland cement, its performance should be consistent with GB 175 Provisions.

4.2 fine aggregate shall comply with GB/T 14684 of.

4.3 coarse aggregate crushed stone or gravel should be adopted, its performance should be consistent with the provisions of GB/T 14685, wherein the maximum particle size should not exceed stones Clear distance between two adjacent circular holes, reinforcement spacing should not exceed 3/4, and should comply with the relevant provisions of GB 50204-2002.

4.4 concrete mixing and curing water should comply with the provisions JGJ63.

4.5 concrete admixtures shall comply with the provisions of GB 8076. Prestressed prohibited the use of chlorine or other additives salt corrosion of steel Effect of admixtures. Concrete admixture application shall comply with the provisions of GB 50119.

4.6 The use of admixtures, shall not adversely affect the product performance, admixture shall comply with the relevant product standard before use it must be tested to verify.

4.7 of prestressed tendons should adopt CRB650 CRB800 or cold-rolled ribbed steel, carbon steel and may also be scored Steel, non-prestressed members should adopt CRB550 cold-rolled ribbed steel, reinforced concrete Hot rolled I, II grade steel or cold drawn low carbon steel Silk, its performance shall conform to GB 13788, GB T 5223, GB 1499.1, GB 1499.2 540 in the corresponding provisions/and JC/T.

5 Technical requirements

6 Loose ends length <=50, width <=20

7 Live not more than one rib per piece, length <=50

8 Projections each tumor is not more than three, highly <=5

size

deviation

9 Length + 10-5

Width 10 ± 5

Height 11 ± 5

12 Lateral bending <=L/750

13 surface flatness 2m length of not more than 5

14 Reinforcement protection layer thickness + 5-3

15 Hole diameter + 3-5

16 Diagonal difference <=10

17 Prestressed center displacement ± 3

5.5.2 supporting member appearance quality and size tolerances shall comply with the provisions of Table 13.

Table 13 supporting members appearance quality and dimension deviation in millimeters

Sub-category items items Tolerance Qualified 1 exposed tendons allowed

2 Cracks not allowed 3 holes allowed 4 chipping off the side of not more than 1 per piece, length <=40, width <=20

5 Honeycomb is not more than 3% of the same surface area 6 length + 10-5 7 width ± 5 8 height ± 5 Reinforcement protection Thickness Beam + 10-5 Board + 5-3 10 lateral bending <=L/750 11 surface flatness 2m length of not more than 7 12 diagonal difference <=12 13 holes for the displacement of the center of <=7

NOTE. Diagonal difference only applies to the stepping plates.

5.6 Mechanical Properties Prestressed indicators should include testing the mechanical properties of the bearing capacity, deflection, and crack inspection; non-prestressed mechanical performance test indicators should be Including capacity, deflection and crack width.

5.6.1 Carrying Capacity 5.6.1.1 requires inspection by the design specification of concrete structures, should be conforming to the formula (1) Requirements.

gamma0u>=gamma0 [gammau] (1) where.

Gamma0u --- Load Bearing Test coefficient found that one of the tables listed in GB 50204-2002 test hallmark 9.3.2 reached the Found with the load bearing capacity of test design value (includes weight) ratio. test load bearing capacity design value according to JC/T 624 shall be calculated;

[Gammau] --- Bearing Test coefficient allowable value, according to GB 50204-2002 Table 9.3.2 access;

Importance factor gamma0 --- structural member supporting member for hole plate and take gamma0 = 1.

5.6.1.2 requires carrying capacity in real time with reinforced inspection shall comply with the formula (2) requirements.

gamma0u>=gamma0eta [gammau] (2) where.

Bearing Test eta --- correction factor, ie the ratio of capacity calculation with real value and the design value of internal force reinforcemen...