GOST 24379-80 Foundation Bolts. General Specifications

GOST 24379.0-80

This standard applies to foundation bolts with thread diameters from 12 to 48 mm for climatic region I₁ per GOST 16350-80, and from 12 to 140 mm for other climatic regions of the USSR, intended for fastening building structures and equipment.

FOUNDATION BOLTS General specifications Foundation bolts. General specification	GOST 24379.0-80

1. Classification

Bolts are classified by design configuration, method of installation into the foundation, method of anchoring in the foundation concrete, and operating conditions.

By design configuration, bolts are divided into types:

1 — bent; 2 — with anchor plate; 3 — composite; 4 — removable; 5 — straight; 6 — with conical end.

By method of installation into the foundation, bolts are divided into those installed before the foundation is concreted and those installed into finished foundations in wells or boreholes.

Bolts installed before the foundation is concreted include: bent (type 1, version 1), with anchor plate (type 2), composite (type 3), removable (type 4).

Note. When installing removable bolts, only the anchor reinforcement is embedded in the foundation mass, while the stud is installed freely in the pipe after the foundation is constructed.

Bolts installed into finished foundations in wells or boreholes include: bent (type 1, version 2), straight (type 5), with conical end (type 6).

Note. Type 1, version 3 bolts are installed in wells pre-formed in the foundations, while type 5 and 6 bolts are installed in boreholes drilled in finished foundations using mechanized tools.

By method of anchoring in the foundation concrete, bolts are divided into those anchored by direct interaction of elements (studs or anchor plates) with the foundation concrete (types 1–4) and those anchored using epoxy or siloxane adhesive, as well as cement-sand mixtures (types 5 and 6, versions 2 and 3); and those anchored using expanding collets (type 6, version 1).

By operating conditions, bolts are divided into design bolts and structural bolts.

Design bolts include bolts that carry loads arising during the operation of building structures or equipment.

Structural bolts include bolts provided for fastening building structures and equipment whose stability against overturning or sliding is ensured by the self-weight of the structures or equipment. Structural bolts are intended for aligning building structures and equipment during installation, for ensuring stable operation of structures and equipment during service, and for preventing their accidental displacement.

2. Technical requirements

Bolts shall be manufactured in accordance with the requirements of this standard and GOST 24379.1-80.

The steel grades of studs for design bolts, depending on the climatic construction regions, shall be adopted according to Table 1.

Table 1

Steel grade	Regulatory document	Steel category for the climatic region of construction per GOST 16350-80
		II ₁II ₅ etc.	I ₂, II ₂ and II ₃	I ₁
St/3kp	GOST 535-88	2*	-	-
St3ps	GOST 535-88	2	4**	-
20	GOST 1050-88	+	-	-
09G2S	GOST 19281-73	6* ⁴	6	6***
10G2S1	GOST 19281-73	6* ⁴	6	6***

* For fastening building structures and equipment, if provided for by All-Union Process Design Standards (ONTP).

** For bolts with a diameter up to and including 24 mm.

*** For bolts with a diameter up to and including 48 mm.

*⁴ For bolts with a diameter of 56 mm and more; for smaller diameters — subject to technical and economic justification.

The «+» sign means that the steel category and its requirements need not be specified in the design; the «–» sign means that this steel grade should not be used in the specified climatic region.

Bolt studs may be manufactured from steels of other grades whose mechanical properties are not lower than those of the steel grades specified in Table 1.

Studs of structural bolts shall be manufactured from steel grade St3kp2 per GOST 535-88 in all climatic regions.

The steel grade for studs of structural bolts, if the latter are subject to verification for seismic effects and effects arising during emergency equipment operation, shall be assigned the same as for studs of design bolts.

The calculated cross-sectional area of studs (at the thread), depending on the nominal thread diameter, shall be adopted in accordance with the reference appendix.

Nuts and couplings of bolts shall be manufactured from steels of the same grades as the studs. The use of corresponding category 2 steels is permitted.

Washers and caps shall be manufactured from steel grade 20 per GOST 1050-88 or grade S235 per GOST 27772-88; bushings — from carbon steel grade St3kp2 per GOST 535-88; collets and tubes — from any group B steel grade per GOST 10705-80 and GOST 10706-76.

Cast anchor plates for type 2, version 3 bolts shall be manufactured from grey cast iron grade SCh15 per GOST 1412-85, and for type 4, version 2 bolts — from steel grade 25L, meeting the requirements for casting group II per GOST 977-88.

By agreement between the customer and the manufacturer, studs with an extended threaded portion may be manufactured.

The appearance of studs and nuts shall comply with the requirements for product grade C per GOST 1759.0-87.

3. Set composition

Bolts shall be supplied by the manufacturer as a complete set in accordance with Fig. 1 of GOST 24379.1-80.

The composition of the bolt set shall comply with Table 2.

Table 2

Bolt type	Type	Bolt name	Parts and assembly units of the set	Quantity
			1. Stud (item 1)	1
	1		2. Washer	1
1		Bent bolts	3. Nut per GOST 5915-70	2
			1. Stud (item 2)	1
	2		2. Washer	1
			3. Nut per GOST 5915-70	2
			1. Stud (item 3)	1
	1		2. Anchor plate (item 11)	1
			3. Washer	1
			4. Nut per GOST 5915-70	4
			1. Stud (item 4)	1
2	2	Bolts with anchor	2. Anchor plate (item 11)	1
		plate	3. Washer	1
			4. Nut per GOST 10605-72	4
			1. Stud (item 4)	1
	3		2. Anchor plate (item 13)	1
			3. Washer	2
			4. Nut per GOST 10605-72	3
			1. Stud (item 3)	1
			2. Stud (item 5)	1
	1		3. Coupling (item 13)	1
			4. Anchor plate (item 11)	1
			5. Washer	1
3		Composite bolts	6. Nut per GOST 5915-70	4
			1. Stud (item 4)	1
			2. Stud (item 5)	1
	2		3. Coupling (item 13)	1
			4. Anchor plate (item 11)	1
			5. Washer	1
			6. Nut per GOST 10605-72	4
			1. Stud (item 5)	1
	1		2. Anchor reinforcement (item 14, version 1)	1
			3. Washer	1
			4. Nut per GOST 5915-70	2
			1. Stud (item 6)	1
4	2	Removable bolts	2. Anchor bar (item 14, version 2)	1
			3. Washer	1
			4. Nut per GOST 10605-72	2
			1. Stud (item 6)	1
	3		2. Anchor bar (item 14, version 3)	1
			3. Washer	1
			4. Nut per GOST 10605-72	2
			1. Stud (item 7)	1
5	-	Straight bolts	2. Washer	1
			3. Nut per GOST 5915-70	2
			1. Stud (item 8) (item 15)	1
	1		2. Expanding collet (item 15)	1
			3. Washer.	1
			4. Nut per GOST 5915-70	2
		Bolts with conical	1. Stud (item 9)	1
6	2	end	2. Conical bushing (item 16)	1
			3. Washer	1
			4. Nut per GOST 5915-70	2
			1. Stud (item 10)	1
	3		2. Washer	1
			3. Nut per GOST 5915-70	2

By agreement between the customer and the manufacturer, bolts may be supplied separately, by individual parts and assembly units.

4. Acceptance rules

Bolts shall be accepted by the manufacturer’s technical inspection to verify compliance with the requirements of this standard and GOST 24379.1-80.

Bolts shall be accepted in batches consisting of items of a single designation. The batch size is established by agreement between the customer and the manufacturer. In mass production, a batch shall comprise items manufactured by the plant over a period of not more than one day.

To check bolts for compliance with the requirements of this standard and GOST 24379.1-80, 3 samples are taken from the batch.

If, during inspection of the selected bolts, at least one bolt fails to meet the requirements of this standard and GOST 24379.1-80, double the number of bolts shall be selected from the same batch and re-inspected. If the results of the re-inspection are unsatisfactory, the batch is rejected.

Acceptance rules for bolts with respect to appearance and dimensions, depending on batch size, shall comply with those specified in GOST 17769-83.

A batch of items is considered accepted if inspection establishes that all bolt parameters comply with those specified in this standard and GOST 24379.1-80.

The customer has the right to perform quality control of the bolts, observing the acceptance rules and applying the inspection methods established by this standard.

At the customer’s request, bolt studs shall be tested for breaking strength, tensile strength and impact toughness.

The results of the acceptance inspection of bolts shall be documented in a report in accordance with the established procedure.

5. Inspection methods

The mechanical properties of bolts shall meet the relevant requirements of the standards for the materials from which they are made. The quality of the material used for bolts shall be certified by the suppliers’ certificates.

Inspection of the thread, deviations of linear dimensions, form and location of part surfaces from nominal values, and surface roughness, shall be carried out in accordance with GOST 1759.1-82 and GOST 1759.2-82.

Dimensions not limited by tolerances are not inspected; compliance with them is ensured by the manufacturing process.

Testing of studs for breaking strength, tensile strength and impact toughness shall be carried out according to the procedure of GOST 1759.4-87. 3 studs from the batch are subjected to testing.

The appearance of bolts and their parts is checked visually without the use of magnifying instruments.

6. Marking, packaging, transportation and storage

A mark indicating the nominal thread diameter of the stud in mm and the stud length in cm shall be applied to the end face of the studs. For studs with a diameter of M12, the mark may be applied to a tag attached with wire to the set of studs.

On studs intended for bolts operated at a design winter outdoor air temperature below 40 °C, the letters KhL shall additionally be indicated in the mark.

On the anchor bar, the mark shall be applied to the outer surface of the pipe at the middle of its length and shall indicate the nominal thread diameter of the stud in mm and the pipe length in cm.

On anchor plates, the mark shall be applied to the face of the plate and shall indicate the nominal thread diameter of the stud and the size of the square plate B or the outer diameter of the round plate D₁, in mm.

On couplings, conical bushings and collets, the mark shall be applied to the outer surface of the item and shall indicate the nominal thread diameter, in mm, of the stud for which the item is intended.

Other marking requirements are per GOST 1759.0-87.

Before packaging, the threaded parts of bolts shall be coated with PVK grease to GOST 19537-83 and wrapped in paper to GOST 515-77. At the customer’s request, bolt studs (except the thread) may be coated with BT-99 varnish to GOST 8017-74. Before installing the bolts in the foundation, the varnish coating must be removed.

Other rules for packaging of items and marking of shipping containers are per GOST 18160-72.

Each batch of items shall be accompanied by a quality passport to GOST 2.601-68, indicating: the name and address of the manufacturer or its trademark; the batch number; the item designation; the item’s completeness (set composition); the date of manufacture; and the net weight of the batch.

Note. The quality passport may be placed inside the container.

Bolts and their parts may be transported by any means of transport. Reliable securing and protection against mechanical damage shall be ensured.

Transportation of items in containers without packaging is not permitted.

Bolts shall be stored in warehouses sorted by type, version and size and shall be protected from contamination. The air in the storage area must not contain impurities of aggressive gases that cause corrosion of the bolts.

7. Manufacturer’s warranty

The manufacturer guarantees that the bolts comply with the requirements of this standard, provided the transportation and storage conditions are observed.

Design cross-sectional area of bolts

Nominal thread diameter of stud d, mm	Design cross-sectional area F r, cm²	Nominal thread diameter of stud, d, mm	Design cross-sectional area F r, cm²
12	0.84	64	26.76
16	1.57	72	34.60
20	2.45	80	43.44
24	3.52	90	55.91
30	5.60	100	69.95
36	8.16	110	85.56
42	11.20	125	111.91
48	14.72	140	141.81
56	20.30

Note. The design cross-sectional area of bolts is determined according to ST SEV 182-75.

Corresponds to DIN 529.