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SNIP 2.06.08-87 - Concrete and concrete structures of hydraulic structures

SNIP 2.06.08-87 - Concrete and concrete structures of hydraulic structures

building regulations

Concrete and reinforced concrete structures
waterworks

SNIP 2.06.08-87

STATE BUILDINGCOMMITTEE USSR

Moscow 1988

DESIGNED VNIIG... Vedeneev USSR Ministry of Energy (Candidate of Technical Sciences AP Pak - head of works; AV Karavaev; Candidates of Technical Sciences AD Kaufman, MS Lamkin, A.. N. Marchuk, LP Trapeznikov, VB Sudakov; doctor tehn Sciences L. A. Gordon, I. Sokolov ) together with Hydroproject them..Zhuk USSR Ministry of Energy ( AG Shards, TI Sergeeva ; Doctor of Technical Sciences SA Fried,. SA Berezinski );GruzNIIEGS USSR Ministry of Energy (Doctor of Technical Sciences GP Verbitsky .);Giprorechtrans Minrechflota RSFSR (Candidate of Sciences tahn V. E. Darevskii ;.. Lenmorniiproekt Minmorflot USSR (Candidate of Technical Sciences AA Dolinsky );.. IN Soyuzvodproekt Minvodkhoz (Candidate of Technical Sciences S. ..3. Ragolsky ).

INCLUDED USSR Ministry of Energy.

prepared for approval by the Office of standardization and technical standards in the construction of the State construction Committee of the USSR ( DV Petukhov ) .

With the introduction of SNIP 2.06.08-87"Concrete and reinforced concrete structures of hydraulic structures" from January 1, 1988 are repealed SNIP II-56-77 «Concrete and reinforced concrete structures of hydraulic structures».

When using the standard document should take into account the changes approved building codes and state standards, published in the journal "Bulletin of construction machinery", "Compendium of changes to building regulations," State construction Committee of the USSR and the information signs "State standards of the USSR" State standard of the USSR.


State Construction Committee
Soviet Union (USSR State Building)
Building Regulations SNIP 2.06.08.87
Concrete and reinforced concrete structures of hydraulic structures Instead
SNIP II-56-77

These standards apply to the design of new construction and reconstruction of concrete and reinforced concrete structures of hydraulic structures, which are continuously or intermittently exposed to the aqueous medium.

elements of concrete and reinforced concrete structures of hydraulic structures, are not exposed to the aquatic environment should be designed in accordance with the requirements of SNIP 2.03-01-84;concrete and reinforced concrete structures of bridges, tunnels and transport pipes, located beneath mounds of roads and railways, should be designed according to SNIP 2.05.03-84.

Projects constructions intended for construction in seismic areas in Northern construction climatic zone, in areas where subsidence, swelling and weak on the physical and mechanical properties of soil, shall be met additional requirements for such facilities by the relevant regulatory documents approved orUSSR State agreed.

Basic letter symbols and codes adopted in these standards according to ST SEV 1565-79 are given in Informative Annex 1.

1. GENERAL PROVISIONS

1.1. When designing concrete and reinforced concrete hydraulic structures necessary to comply with the requirements of SNIP 2.06.01-86, and building codes and regulations for the design of certain types of hydraulic structures.

1.2. Select the type of concrete and reinforced concrete (monolithic, precast-monolithic, precast, including prestressed and anchored into the ground) should be made based on the conditions of the feasibility of their application in specific circumstances of construction, taking into account the maximum reduction of material consumption, energy consumption, labor inputand the cost of construction.

When choosing prefabricated elements should be considered prestressed structures made of high-strength concrete and reinforcement, as well as the construction of lightweight concrete.

types of constructions, the main dimensions of the elements, as well as the degree of saturation of concrete constructions should be taken on the basis of comparison of technical and economic parameters of options.

Made

the Ministry of Energy and Electrification of the USSR

approved Resolution
State Construction Committee of the USSR

on February 26, 1987 № 37
Term
introduction

into effect January 1, 1988 g.

1.3. prefabricated elements should meet the conditions of mechanized production of specialized enterprises.

should consider the feasibility of consolidation of prefabricated structures, taking into account the conditions of their production, transportation, duty mounting mechanisms.

1.4. For monolithic structures should include standardized sizes that allow to apply the inventory formwork.

1.5. constructions in prefabricated components and compounds of the elements have to provide reliable transmission of forces, the strength of the elements themselves in the joint area, and the link is further poured concrete in the joint construction with concrete.

1.6. When designing the structures of hydraulic structures, insufficiently tested practice of design and construction, to the difficult conditions of static and dynamic structural work (when the nature of stress and strain state with the necessary certainty can not be determined by calculation) should be studied.

1.7. To provide the desired water resistance and cold resistance structures, as well as to reduce back pressure of water in their calculation sections necessary to provide the following outputs:

laying concrete corresponding marks on water resistance and frost from the upstream face and the outer surfaces (especially in areas of variable water level);

use of surfactant additives to concrete (air entraining plasticizing and others.);

waterproofing and heat-external surfaces of buildings;

concrete compression from the pressure faces and side surfaces of structures undergoing tension of operating loads;

drainage device from the upstream side.

Selecting event should be based on technical and economic comparison of options.

2. MATERIALS FOR CONCRETE AND CONCRETE STRUCTURES

CONCRETE

2.1. Concrete for concrete and reinforced concrete hydraulic structures must meet the requirements of GOST 26633-85 and this section.

2.2. When designing concrete and reinforced concrete hydraulic structures, depending on the type and conditions necessary to establish concrete quality indicators, the main ones are the following:

a) concrete classes on the compressive strength, which correspond to the values ​​guaranteed by the strength of concrete, MPa, with security q = 0,95.The massive concrete structures is allowed to use the values ​​of guaranteed strength with security q = 0,9 .

The projects need to include the following concrete classes compressive strength: B5, B7.5, B10, V12,5, B15, B20, B25, B30, B35;

b) concrete strength classes on axial tension.This characteristic is set in those cases where it is a dominant value in the production and controlled.

The projects need to include the following concrete classes in the axial tensile strength:;

c) the grade of concrete frost resistance.

The project is necessary to provide the following brands of concrete on frost resistance: F50, F75, F100, F150, F200, F300, F400, F500, F600.

brands of concrete frost resistance should be used depending on the climatic conditions and the number of settlement cycles of alternate freezing and thawing during the year (according to the long-term observation), taking into account the operating conditions.For energy installations concrete mark on frost resistance should be taken from Table.1.

Table 1

Climatic conditions concrete Mark on frost resistance with the number of cycles of alternate freezing and thawing in the year
to 50 incl. St.50 to 75 St.75 to 100 St.100 to 150 St.150 to 200 incl.
Moderate F50 F100 F150 F200 F300
Severe F100 F150 F200 F300 F400
particularly severe F200 F300 F400 F500 F600

Notes: 1. The climatic conditions are characterized by the average monthly temperature of the coldest month: moderate - higher than minus 10 ° C, severe - from minus 10 ° C to minus 20 ° C, incl., particularly severe - below minus 20 ° C.

2. Average temperature of the coldest month of the construction area are determined by the SNIP 2.01.01-82, as well as according to the Hydrometeorological Service.

3. When the number of calculation cycles to be applied more than 200 kinds of special concrete or structural heat protection.

r) brand waterproofing concrete.

The project is necessary to provide the following brands of concrete on water resistance: W2, W4, W6, W8, W10, W12, W16, W18, W20.

Mark concrete waterproofing administered depending on the pressure gradient, defined as the ratio of the maximum pressure in meters to the thickness construction (or the distance from the upstream side to drainage) in meters, and temperature of water in contact with the structure, ° C according to Table.2, or depending on the aggressiveness of the environment in accordance with the SNP 2.03.11-85.

In netreschinostoykih pressure concrete structures and netreschinostoykih free-flow designs maritime structures design grade of concrete waterproofing should not be less than W4.

Table 2

water temperature, ° C concrete Mark on water resistance when pressure gradients
to 5 incl. St. . 5 to 10 St.10 to 20 St.20 to 30 incl.
Up to 10 incl. W2 W4 W6 W8
St. 10 to 30 incl. W4 W6 W8 W10
St. 30 W6 W8 W10 W12

Note.For designs with a gradient of pressure in excess of 30 should be given concrete mark for water resistance W16 and higher.

2.3. With proper justification is allowed to set intermediate values ​​of concrete classes of compressive strength than those listed in paragraph. 2.2 , and classes B40 and higher.The characteristics of these concretes to be taken on SNIP 2.03.01-84 and interpolation.

2.4 .For concrete constructions of hydraulic structures should bring additional, installed in projects and confirmed by experimental research requirements: for utmost extensibility, there are no harmful interactions cement bases with fillers, resistance to abrasion water flow with bottom and suspended sediment, resistance against cavitation and chemical exposure, heat generation athardening concrete.

2.5 .Term hardening (age) of concrete, corresponding to its classes on the compressive strength of on axial tension and brand waterproofing, taken as a rule, for the construction of river waterworks 180 days, for prefabricated and monolithic constructions of sea and river port facilities 28 days.hardening period (age) concrete that meets its design mark on frost resistance, taken 28 days for massive structures erected in warm formwork 60 days.

If you know the timing of the actual loading of structures, methods of their construction, the conditions of concrete hardening, the type and quality of cement used, the concrete is allowed to set a class in a different age.

for the team, including pre-stressed structures, selling concrete compressive strength should be taken in accordance with GOST 13015.0-83, but not less than 70% of the strength of the received concrete class.

2.6. For reinforced concrete elements of heavy concrete, calculated on the impact of multiple repetitive load and compressed concrete beam structures (embankments type platforms on stilts, stilt-shells and so on. N.) Should be used Class concrete compressive strength of not less than B15.

2.7. for prestressed elements to be taken by the concrete class Compressive strength: not less than B15 - for structures with reinforcing rods;at least B30 - for elements submerged in the soil clogging or vibrating.

2.8. embedment of joints for prefabricated elements, which are in use may be exposed to subzero temperatures outside air or exposed to aggressive water, should apply concrete project marks on frost resistance and water resistance are not inferior to those adopted for the abutting elements.

2.9. should include widely used surfactant additives (RRT, START, LHD, and others.), As well as use as an active mineral admixture fly ash thermal power plants, meeting the requirements of the relevant regulations.

2.10. If technical and economic calculations to increase the water resistance of concrete and reinforced concrete hydraulic structures should be used in the prestressing concrete cement, and to reduce the burden of its own weight design - lightweight concrete, the classes and grades of concrete should be made according to SNIP 2.03.01-84.

2.11 .Normative and calculated resistance of concrete, depending on the concrete classes for compressive strength and axial tension should be taken from Table.3.

In case the intermediate grade concrete regulatory and calculated resistance should be taken for interpolation.

2.12 .Odds conditions, concrete work should be taken from Table.4.

2.13. When calculating reinforced concrete structures endurance Design strength of concrete Rb and Rbt must be multiplied by a coefficient of working conditions, taken from Table.5.

2.14. Design strength of concrete under hydrostatic compression Rba , MPa, shall be determined by the formula

, (1)

Table 3

concrete class Normative and calculated resistance of concrete, MPa (kg / cm3)
regulatory resistance;calculated resistance for the limit states of the second group calculated resistance for the limit states of the first group
compressive axial (prism strength) Rbn , Rb, ser tensile axial Rbtn , Rbt, ser axial compression (strength of prism) Rb axial tensile Rbt
compressive strength
B5 3,5 (35,7) 0,55 (5,61) 2,8 (28,6) 0,37 (3,77)
B7,5 5,5 (56,1) 0,70 (7,14) 4,5 (45,9) 0,48 (4,89)
B10 7,5 (76,5) 0,85 (8,67) 6,0 (61,2) 0,57 (5,81)
B12,5 9,5 (96,9) 1,00 (10,2) 7,5 (76,5) 0,66 (6,73)
B15 11,0 (112) 1,15 (11,7) 8,5 (86,7) 0,75 (7,65)
B20 15,0 (153) 1,40 (14,3) 11,5 (117) 0,90 (9,18)
B25 185 (189) 1,60 (16,3) 14,5 (148) 1,05 (10,7)
B30 22,0 (224) 1,80 (18,4) 17,0 (173) 1,20 (12,2)
B35 25,5 (260) 1,95 (19,9) 195 (199) 1,30 (13,3)
B40 29,0 (296) 2,10 (21,4) 22,0 (224) 1,