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Burst Expansion Anchor

A Burst Expansion Anchor is a tail-expanding, ultra-high tensile strength mechanical anchor. It operates by retracting an internal cone, which forcibly expands the slotted tail segments of a metal sleeve at the bottom of the concrete hole. This creates a "mechanical undercut" lock (simulating an undercut anchor), achieving pull-out resistance far exceeding that of standard expansion anchors (typically 2-3 times higher). Its core value lies in deep embedment (>8 times the bolt diameter), making it suitable for extreme heavy loads, vibration resistance, and impact resistance scenarios.

Key Components:
Slotted Expansion Sleeve: Features 4-6 longitudinal slots at the tail end. Expands to form "gripping fingers". Made of high-strength steel or stainless steel.The
Tapered Cone Plug: The front end is the expansion-driving cone. The central section is the load-bearing threaded stud (designed for internal or external hex drive).
Dual Washer System: Flat washer to distribute pressure + Spring washer to prevent loosening under vibration. This constitutes the critical anti-vibration defense.
Component Interaction: Tightening the stud → Retracts the cone → Causes violent ("explosive") radial expansion of the sleeve tail. → All three components are essential!

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Working Principle

Drill & Clean Hole: Drill a hole with a precise diameter (bolt diameter + ~2mm) and depth ≥ 8 times the bolt diameter. Thoroughly clean out the dust.

Insert to Bottom: Insert the complete assembly (sleeve + cone plug + stud + washers) to the absolute bottom of the hole (Full contact with the hole bottom is imperative!).

Tighten & Expand: Tighten the nut with a wrench → Draws the stud outward → Forces the cone plug backwards, wedging into the slotted sleeve tail → Causes radial expansion ("bursting") of the sleeve tail → Creates a deep mechanical undercut lock.the the

Dual Anchorage: Mechanical undercut lock resists tension (pull-out) + Bolt shank resists shear, providing high-strength bidirectional load capacity.

Advantage

Irreplaceable Advantages of Burst Expansion Anchor:

1. Ultimate Tensile Strength (Pull-out Resistance)

Deep Mechanical Undercut Design: Tail segments expand to form a "mechanical hook," delivering >3x the pull-out resistance of standard expansion anchors (e.g., M16 in C30 concrete: >70 kN).
Engineering Value: The safety cornerstone for super-heavy lifting systems (e.g., gantry crane rails for 10,000-ton capacity).

2. Ultimate Vibration Resistance & Loosening Prevention

Dual Anti-Loosening Mechanism:
* Mechanical undercut resists structural vibration.
* Spring washer absorbs high-frequency micro-vibrations.
Certified: Passes ISO 16130 vibration test (zero loosening after 2000 cycles at ±2mm amplitude).

3. Superior Impact Resistance

Undercut structure disperses stress, tolerating instantaneous shock loads up to 15g acceleration (equivalent to 2x the force of an automotive collision).
Typical Applications: Crusher bases in mines, weapon test benches.

4. Smart Evolution Potential

Removable Design: Reverse tightening releases the cone, enabling non-destructive removal (reducing maintenance costs by ↓50%).
Real-time Monitoring: Optional fiber-optic sensor anchors wirelessly transmit preload loss data (IoT integration).
Mandatory Conditions for Performance:
Substrate Strength: Only suitable for ≥C30 solid concrete/granite (Compressive strength >30 MPa).

Installation Precision:

Hole Depth = 8 × Bolt Diameter (Tolerance ≤ ±2mm) Shallower depth causes failure

Hole Diameter = Bolt Diameter + 2mm (Tolerance ≤ ±0.3mm)

Dust Removal: Complete cleaning (compressed air + brush).

Engineering Value Proposition

Irreplaceable Applications:

Lifeline Structures: Nuclear power equipment supports, suspension bridge anchor blocks.

Dynamic Load Critical Zones: High-speed rail seismic isolation bearings, LNG tank anchorage.

Century Projects: Immersed tunnel waterstop fixation (e.g., Hong Kong-Zhuhai-Macao Bridge, 200-year design life).

Absolute Usage Prohibitions:

Lightweight Masonry Blocks (Crushing risk)
Concrete with Cracks >0.3mm (Lock failure)

Summary: The drop-in anchor is the ultimate solution for heavy-load, vibration-resistant, and extreme-environment anchoring, with its deep tail mechanical undercut as the core technological barrier. Its performance mandates strict adherence to the "Three Highs" Principle:

High Material Strength (Substrate)

Precision Installation

High Load Resistance (Design)

Application

1. Heavy-Duty Suspension & Anti-Overturning Applications

Scenarios

Large industrial crane rails (shipyard gantry cranes, nuclear plant bridge cranes)

High-rise building façade maintenance unit tracks

Wind turbine tower base anchors

Offshore platform helicopter deck supports

Core Functions

Ultimate Pullout Resistance: Mechanical interlock at hole base; single M36 bolt withstands ≥450kN pullout force.
Anti-Overturning Stability: Resists wind/wave overturning moments (complies with IEC 61400-6, DNVGL standards).

2. High-Vibration & Impact Equipment Fixing

Scenarios

Mining crusher and ball mill bases

High-speed rail bridge seismic bearings

Ship deck machinery

Military weapon test platforms

Core Functions

Vibration & Loosening Resistance: Dual protection via spring washers + mechanical interlock; passes ISO 16130 vibration test (zero loosening after 2,000 cycles at ±2mm amplitude).
Impact Load Capacity: Withstands instantaneous shock (15g acceleration) and fatigue loads (validated per EN 1991-2 for 200,000 cycles).

3. Extreme Environment Applications

Scenarios

LNG tank anchoring (-196°C cryogenic conditions)

Cable tower crane rails for cross-sea bridges (high salt-spray corrosion)

Equipment brackets in nuclear plant radiation zones

Chemical reactor tower foundations

Core Functions

Cryogenic Toughness: AISI 316L stainless steel (>100J impact toughness at -196°C).
Long-Term Corrosion Resistance: 316 stainless steel + hot-dip galvanizing (salt-spray resistance >5,000 hours).
Radiation Resistance: Special alloys (ASTM A276 Type 304N) resist γ-ray embrittlement.

4. Innovative Engineering Applications

Scenarios

Historic building stone façade reinforcement

Modular data center cabinet bases

Dam safety monitoring point anchoring

Space experiment module ground simulation frames

Core Functions

Shallow-Hole High Pullout: Special short-bolt designs achieve standard pullout resistance at 60mm embedment depth.
Removable Design: Reverse loosening releases the cone, allowing non-destructive extraction.
Smart Monitoring: Embedded fiber optic sensors transmit real-time preload data.

5. Prohibited Applications

Low-Strength Substrates: Aerated concrete, ceramic blocks (crushing risk during expansion).
Ultra-High-Frequency Vibration: >50Hz with >5mm amplitude (causes metal fatigue fracture).
Strong Acid Environments: pH <2 zones (induces stainless steel intergranular corrosion).

Burst Expansion Anchor Barbed Expansion Bolts Zinc Plated Sleeve Anchor Brass Anchor Bolts Barbed Sleeve Anchor

Burst Expansion Anchor
Model	Screw Length (mm)	Effective Burial Depth (mm)	Installation Hole Diameter (mm)	Drilling Depth (mm)	Installation Torque (mm)	Design Tension (kN)	Ultimate Tension (kN)
6*60	60	43	8	50	4	0.99	5
6*80	80	63	8	70	4	0.99	5
6*100	100	83	8	90	4	0.99	5
6*120	120	103	8	110	4	0.99	5
6*150	150	130	8	135	4	0.99	5
8*60	60	36	10	44	8	2.3	9
8*70	70	46	10	54	8	2.3	9.5
8*80	80	56	10	64	8	2.3	9.5
8*100	100	76	10	84	8	2.3	9.8
8*120	120	96	10	104	8	2.3	9.9
8*150	150	126	10	134	8	2.3	9.8
8*200	200	176	10	184	8	2.3	9.9
10*60	60	32	12	42	25	7	25
10*70	70	42	12	52	25	7	25
10*80	80	51	12	61	25	7	28
10*90	90	61	12	71	25	7	28
10*100	100	71	12	81	25	7	28
10*110	110	81	12	91	25	7	28
10*120	120	91	12	101	25	7	28
10*150	150	120	12	131	25	7	28
10*200	200	170	12	181	25	7	28
12*70	70	36	14	48	40	15	35
12*80	80	46	14	58	40	15	35
12*90	90	56	14	68	40	15	38
12*100	100	66	14	78	40	15	38
12*110	110	76	14	88	40	15	38
12*120	120	86	14	98	40	15	38
12*150	150	116	14	128	40	15	38
14*100	100	65	16	77	50	18	45
14*120	120	85	16	97	50	18	45
14*150	150	115	16	127	50	18	45
14*200	200	165	16	177	50	18	45
16*100	100	50	18	71	60	25	60
16*120	120	78	18	91	60	25	60
16*150	150	108	18	121	60	25	60
16*180	180	138	18	151	60	25	60
16*200	200	160	18	173	60	25	60
18*150	150	110	20	124	80	29	80
18*180	180	140	20	154	80	29	80
18*200	200	160	20	174	80	29	80
20*150	150	98	23	112	110	35	100
20*180	180	130	23	144	110	35	100
20*200	200	150	23	164	110	35	100
20*250	250	200	23	214	110	35	100

Burst Expansion Anchor
Model	Screw Length (mm)	Effective Burial Depth (mm)	Installation Hole Diameter (mm)	Drilling Depth (mm)	Installation Torque (mm)	Design Tension (kN)	Ultimate Tension (kN)
6*60	60	43	8	50	4	0.99	5
6*80	80	63	8	70	4	0.99	5
6*100	100	83	8	90	4	0.99	5
6*120	120	103	8	110	4	0.99	5
6*150	150	130	8	135	4	0.99	5
8*60	60	36	10	44	8	2.3	9
8*70	70	46	10	54	8	2.3	9.5
8*80	80	56	10	64	8	2.3	9.5
8*100	100	76	10	84	8	2.3	9.8
8*120	120	96	10	104	8	2.3	9.9
8*150	150	126	10	134	8	2.3	9.8
8*200	200	176	10	184	8	2.3	9.9
10*60	60	32	12	42	25	7	25
10*70	70	42	12	52	25	7	25
10*80	80	51	12	61	25	7	28
10*90	90	61	12	71	25	7	28
10*100	100	71	12	81	25	7	28
10*110	110	81	12	91	25	7	28
10*120	120	91	12	101	25	7	28
10*150	150	120	12	131	25	7	28
10*200	200	170	12	181	25	7	28
12*70	70	36	14	48	40	15	35
12*80	80	46	14	58	40	15	35
12*90	90	56	14	68	40	15	38
12*100	100	66	14	78	40	15	38
12*110	110	76	14	88	40	15	38
12*120	120	86	14	98	40	15	38
12*150	150	116	14	128	40	15	38
14*100	100	65	16	77	50	18	45
14*120	120	85	16	97	50	18	45
14*150	150	115	16	127	50	18	45
14*200	200	165	16	177	50	18	45
16*100	100	50	18	71	60	25	60
16*120	120	78	18	91	60	25	60
16*150	150	108	18	121	60	25	60
16*180	180	138	18	151	60	25	60
16*200	200	160	18	173	60	25	60
18*150	150	110	20	124	80	29	80
18*180	180	140	20	154	80	29	80
18*200	200	160	20	174	80	29	80
20*150	150	98	23	112	110	35	100
20*180	180	130	23	144	110	35	100
20*200	200	150	23	164	110	35	100
20*250	250	200	23	214	110	35	100

Burst Expansion Anchor

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