GB 31039-2014Pretensioned spun concrete special-shaped piles (English PDF)

Foreword

This standard 6.1.1, 6.1.3, 6.4, 6.5 are mandatory, the rest are recommended.

This standard was drafted in accordance with GB/T 1.1-2009 given rules.

The standard proposed by China Building Materials Federation.

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

1 Scope

This standard specifies the terms and definitions of pre-tensioned prestressed concrete shaped centrifugal piles, product classification, raw materials and general requirements, technical Requirements, test methods, inspection rules, marking, storage and transportation, product certification and so on.

This standard applies to industrial and civil buildings, ports, municipal, bridges, railways, highways, water conservancy projects and foundation treatment and temporary facilities such as the use of pre-tensioned prestressed concrete centrifugal shaped piles.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein Member. For undated references, the latest edition (including any amendments) applies to this document.

GB 175 Common Portland Cement GB/T 700-2006 carbon structural steel GB/T 701 low carbon steel hot rods GB 1499.2 steel reinforced concrete - Part 2. Hot rolled ribbed bars GB/T 1596-2005 for fly ash cement and concrete GB/T 5223.3-2005 prestressed concrete steel bar GB 8076 concrete admixture GB 13476-2009 pre-tensioned Prestressed Concrete Piles GB/T 14684 construction sand GB/T 14685 construction with gravel, crushed stone GB/T 18046-2008 for cement and concrete granulated blast furnace slag powder GB/T 18736-2002 high performance concrete with mineral admixtures GB/T 50081 mechanical properties of ordinary concrete test method standards GB 50107 Concrete Strength Inspection and Evaluation Standards GB 50153-2008 engineering structure reliability design of uniform standards GB 50164 concrete quality control standards JC/T 540 concrete products cold drawn low carbon steel wire JC/T 947 pre-tensioned prestressed concrete pile end plates JC/T 950-2005 Prestressed Concrete Piles of silica sand powder JGJ63 concrete water standards

3 Terms and Definitions

The following terms and definitions apply to this document.

Pile cross-sectional outer contour of a non-circular, square or non-uniform cross section of the longitudinal direction of the non-centrifugal molding process of pre-tensioned prestressed mix Concrete pile (hereinafter referred to as shaped piles, see Figure 1).

a) bamboo pile

b) ribbed bamboo pile

c) octagonal pile

d) hexagonal pile

e) expanding pile head Explanation.

D --- nominal diameter;

Dj --- bamboo outer diameter;

Dg --- expanding the outer diameter of the head;

t --- wall thickness;

L --- length;

Lg --- expanding head length;

s --- from bamboo;

bjt --- bamboo top width;

bjb --- bamboo bottom width;

hj --- bamboo height;

brt --- longitudinal rib top width;

brb --- longitudinal rib bottom width;

hr --- longitudinal rib height.

Figure 1 a schematic outline shaped pile

Pre-tensioned prestressed concrete centrifugal bamboo pile pretensionedspunconcreteknotpiles Pile axial direction at equal intervals bamboo-shaped (annular) projections of circular cross-section of the centrifugal molding process of pre-tensioned prestressed concrete pile [Hereinafter referred to as bamboo piles, see Figure 1a)].

Pre-tensioned prestressed concrete ribbed bamboo pile centrifugal pretensionedspunconcreteribbedknotpiles Pile with a longitudinal rib-like projections bamboo pile [hereinafter referred to as ribbed bamboo piles, see Figure 1b)].

Pre-tensioned prestressed concrete octagonal pile centrifugal pretensionedspunconcreteoctagonalpiles Pile cross-sectional outer contour of a centrifugal process octagonal shaped pre-tensioned prestressed concrete piles [hereinafter referred to as the octagonal piles, see Figure 1c)].

Pre-tensioned prestressed concrete centrifugal hexagonal pile pretensionedspunconcretehexagonalpiles Pile cross-sectional outer contour of a centrifugal process hexagonal shaped pre-tensioned prestressed concrete piles [hereinafter referred to as hexagonal piles, see Fig.

Pre-tensioned prestressed concrete centrifugal expansion pile head pretensionedspunconcretesteptaperedpiles A terminal end diameter larger centrifugal molding process of pre-tensioned prestressed concrete piles [hereinafter referred to as enlarged pile head, see Figure 1e)].

Nominal diameter Shaped pile cross-sectional outer contour of the inscribed circle diameter (see Figure 1 size D), the outer diameter of the circular cross-section is the pile.

4 Products

5 Raw materials and general requirements

6 Technical Requirements

7 Broken ribs, head off allowed

8 Ferrule recess depth of the recess should not exceed 10mm

9 Surface concrete slump allowed

Pile joints and ferrule Combined with the pile surface Plasma leakage of plasma leakage depth of not greater than 5mm, plasma leakage length should not exceed 1/6 of the perimeter, and should repair Voids and cellular allowed

6.3 Size Tolerances

Shaped various parts of the pile size tolerances shall comply with the provisions of Table 6.

Table 6 shaped pile size to allow deviation in millimeters

No. Item allowable deviation

1 Length L ± 0.5% L

The second end portion inclined <=0.5% D 3 end surface flatness <=0.5 4 nominal diameter D 300mm ~ 700mm 5-2 800mm ~ 1200mm 7-4 5 and the thickness t any the thickness of the protective layer 6 any 7 pile curvature <=L/1000 8 end plate size tolerances shall comply with JC/T 947 of the relevant provisions 6.4 thickness of concrete cover Structures built with concrete foundation prestressed reinforced protective layer thickness of not less than shaped pile of 40mm. Ground handling and GB 50153-2008 specified in Annex A temporary facility with a base shaped pile of prestressed reinforced concrete protective layer thickness should not be less to 25mm.

6.5 Bending Properties Bending Performance 6.5.1 shaped pile of not less than specified in Table 7.

Table 7 shaped pile bending performance

Nominal diameter D

model

The thickness t

Cracking moment

/ KN · m

Ultimate Moment

/ KN · m

Nominal diameter D

model

The thickness t

Cracking moment

/ KN · m

Ultimate Moment

/ KN · m

Table 7 (continued)

Nominal diameter D

model

The thickness t

Cracking moment

/ KN · m

Ultimate Moment

/ KN · m

Nominal diameter D

model

The thickness t

Cracking moment

/ KN · m

Ultimate Moment

/ KN · m

Note. The table is not the moment to consider the impact of longitudinal ribs.

6.5.2 shaped pile should be 7.5 bending test, when the load to Table 7 cracking moment, the pile should not be cracks.

6.5.3 When loaded into Table 7 ultimate moment, shaped pile should not be any of the following occurs.

a) by the crack width of concrete tensile zone reach 1.5mm;

b) tensile reinforcement pulled off;

c) the destruction of concrete compression zone.

6.5.4 Ultimate Moment shaped pile joints should not be below the limit pile moment.

7 Test methods

7.1 compressive strength of concrete 7.1.1 indwelling concrete specimens

7.1.1.1 When the concrete mix to adjust or change the ratio of raw materials, should produce three groups of specimens.

When mixing 100 per 7.1.1.2 or the same work shift with a mixing ratio of less than 100 concrete, should produce three or more specimens.

Wherein. a set of test specimens prestressed reinforced concrete compressive strength discharge sheets, a set of test specimens of concrete compressive strength 28d (using steam when pressure curing process, after testing the compressive strength of concrete tank 1d), the compressive strength of concrete or alternate rest inspection shaped pile factory.

7.1.2 concrete specimens production and conservation 7.1.2.1 concrete mixture should be stirred station or feeding step randomly, creating a standard size specimens.

7.1.2.2 Inspection intensity level of the specimen after specimen molding and post-shaped pile with the conditions of atmospheric pressure steam curing, form removal into the curing room curing to 28d (when using the autoclave curing process, after form removal into the autoclave curing autoclave was cooled to room temperature after the tank).

7.1.2.3 factory inspection specimen strength, after forming and specimen shaped pile with atmospheric steam curing conditions, after the form removal (using autoclave curing process when, after the form removal into the autoclave curing after the cauldron) and finished with shaped pile conditions to the factory maintenance.

7.1.3 Test Method for Compressive Strength of Concrete Concrete compressive strength test method is executed according to GB/T 50081 of the relevant provisions.

7.2 appearance quality

Table 1-5, check the appearance of the shaped pile quality, in addition to inspection tools and inspection methods specified in Table 8, the remaining items using

Visual inspection method.

Table inspection tools and inspection methods 8 appearance quality

No. Check Item tool and inspection methods for measuring tool division value/mm 1 plasma leakage steel tape measure length, accurate to 1mm 0.5 2 sticky skin and pitted surface, plasma leakage, loss of depth knock with depth vernier caliper measurements, accurate to 0.1mm 0.02 3 crack width with 20 times magnifier reading measurement, accurate to 0.01mm 0.01 4 sticky skin and pockmarked face, knock damage area after steel tape measure to calculate accurate to 1mm 0.5 5 ferrule recess depth with depth vernier caliper measurements, accurate to 0.1mm 0.02

NOTE. Measure No. 1, 2 projects are the basis of the pile, without regard to the thickness of the bamboo and other protruding parts.

7.3 Size Tolerances

Table 6 requirements, shaped pile size tolerance examination, inspection tools and inspection methods are shown in Table 9, in which the end plate size allowed

Xu deviation test performed in JC/T 947 of the relevant provisions.

Table 9 size tolerance of inspection tools and inspection methods

No. Check Item tool and inspection methods for measuring tool division value/mm 1 length L steel measuring tape, accurate to 1mm 0.5 2 end tilt the right angle on foot on the side close to the pile, the other side of the end plate abuts measured for the maximum gap, accurate to 1mm 0.5 3 end surface flatness Steel ruler erected a cross on the end face of the slow rotation, the largest with a feeler Gap, accurate to 0.1mm 0.02 twenty one

Table 9 (continued)

No. Check Item tool and inspection methods for measuring tool division value/mm 4 nominal diameter D Caliper or steel ruler in the same section measuring pile of two mutually perpendicular straight Diameter, the mean value, accurate to 1mm 0.5 5 and the thickness t with a vernier caliper or steel ruler in the same section of the pile two mutually perpendicular straight Diameter measuring four on the wall thickness, measured within two or more in the same section of the pile the minimum thickness of the outer circle to the straight edge of the mean value, accurate to 1mm 0.5 6 pile curvature the opposite ends of the cable close to the pile, steel ruler to measure the maximum bending at Distance to the nearest 1mm 0.5 Note. The nominal diameter D, the thickness t measurements ...