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HZ-20 Concrete Core Drilling Machine
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Product Introduction
HZ‑20 Concrete Core Drilling Machine This machine is one of the HZ series diamond engineering drills, also known as a road‑drilling machine or concrete core drill. Powered by a gasoline engine, it offers quick start-up and reliable operation, making it ideal for locations without access to electricity and for drilling large‑diameter holes in construction projects.
Main uses
The Model 20 engineering drilling rig employs high-speed cutting technology and is compatible with thin-walled diamond drill bits, making it widely used for drilling and core sampling in fields such as construction, municipal engineering, equipment installation, and building quality inspection.
1. Core samples are taken from concrete, asphalt pavement, and limestone foundations at highways, airports, ports, dams, and other sites for compressive and flexural strength testing.
2. Install large machinery and drill anchor bolt holes.
3. Drill holes for the installation of bridge handrails and traffic safety guardrails.Key Features
1. It features a dual-column structure and a screw-feed mechanism, offering excellent stability and simple, effortless operation. Equipped with traveling wheels for convenient mobility.
2. Employing high-speed cutting technology in conjunction with thin-walled diamond drill bits, this method can drill through high-strength reinforced concrete, delivering high drilling efficiency, precise hole positioning, and smooth bore walls. The resulting holes exhibit excellent quality, with intact, smooth core samples and minimal vibration, causing no damage to the structure.Technical Specifications
Larger drill hole diameter 200mm Greater drilling depth 700mm Power 13 horsepower (Honda gasoline engine) Machine weight 200kg External dimensions 1200×800×1300mm
Reasons to Choose Us
Multiple specifications to choose from
Source factory
Ships promptly
Thoughtful service
Supports customization
Selected Raw Materials
Factory Advantages
Deep expertise, comprehensive product range
√Over 10 years of dedicated R&D and manufacturing of testing instruments for highway, construction, geotechnical, asphalt, cement, and other engineering applications.
√Comprehensive category coverage: from raw material testing to construction quality control, a one-stop solution.
√Compliant with international standards such as ISO and GB, meeting the regulatory requirements of overseas projects.
Reliable quality and excellent value for money.
√ We strictly adhere to the ISO 9001 quality management system, select core components from internationally renowned brands, and conduct full inspection before shipment.
√ In-house manufacturing + a large-scale supply chain deliver strong price competitiveness, with no markups from intermediaries.
√Stable and durable, with a low failure rate, reducing operational and maintenance costs for overseas customers.
Efficient delivery, global service
√In-stock inventory plus flexible manufacturing ensures 7–15 day rapid delivery, with support for customized rush orders.
√Cangzhou’s Lin’gang District boasts a strategic location, with convenient sea and air transportation and globally traceable logistics.
√Multilingual team with 24-hour technical support, offering installation and commissioning, training, a three‑year warranty, and ongoing follow-up services.
Operating with integrity and backed by extensive experience.
√13 years of industry expertise, serving over 30 countries and regions worldwide.
√The principle of “integrity in business, mutual benefit.”
√Deep understanding of international engineering standards and procurement processes, with efficient communication and seamless collaboration.
Frequently Asked Questions
Is the universal materials testing machine experiencing loading stalling or abnormal zeroing of load data?
1. Loading lag: Clean the lead screw and guide rails, apply lubricant, and remove debris from the transmission components. 2. Zeroing anomaly: Restart the equipment system, calibrate the load and displacement zero points, and check for poor electrical contact in the sensor wiring. 3. Overloading is strictly prohibited; before testing, verify that the grips are securely tightened to prevent eccentric loading of the specimen.
How often should in‑instrument verification be performed? Which instruments are required to undergo it?
High‑precision, high‑frequency‑use, and drift‑prone equipment (such as balances, penetration testers, water permeability testers, and sensor‑type devices) shall undergo intermediate verification every three months; routine equipment shall be verified every six months. Equipment that is within the verification/calibration interval, has been repaired following a malfunction, or has been relocated must undergo additional intermediate verification, with complete verification records maintained.
Is the repeatability of pendulum-type pavement friction coefficient measurements poor?
Key points for resolution: Prior to testing, thoroughly clean the pavement at each measurement point, ensuring there is no standing water, dust, or debris; calibrate the instrument’s level and zero point to ensure a standardized pendulum‑drop trajectory; strictly control the pendulum’s sliding distance; avoid conditions such as strong winds, wet pavement, or abrupt temperature changes; and calculate the average of multiple measurements taken at the same point.
How should one handle cases where the pavement infiltration meter data exceeds allowable error limits, exhibits leakage, or shows abnormal readings?
1. Sealing leaks: Inspect the base seal for aging or damage and replace it promptly; before testing, firmly press down on the base to expel any residual air inside. 2. Data deviation > ±2%: Calibrate the level sensor, clean any fouling from the graduated cylinder, and check for damage to the scale markings. 3. Compliance with new regulations: For seepage rates ≤ 300 mL/min, existing equipment may continue to be used; for rates > 300 mL/min, the accuracy of older equipment fails to meet standards, and such equipment must not be used.
Can the old Marshall compaction apparatus and stability tester still be used?
According to the 2025 revised asphalt testing procedures, after adjusting the indenter configuration on the Marshall stability test apparatus, existing instruments currently in use may continue to be operated normally without mandatory replacement; only periodic calibration to maintain accuracy and ensure equipment integrity is required.
What are the causes of uneven compaction and layered cracking in molded specimens during compaction testing?
Main causes: non‑vertical drop of the compaction hammer, rail jamming, excessive deviation in hammer weight, uneven layer thickness during loading, insufficient number of blows, or overload. Solutions: regularly lubricate the guide rails; verify and correct the vertical alignment of the hammer; strictly follow the procedure for layered material placement and step‑by‑step compaction; ensure that hammer weight and drop height comply with standards; and prevent over‑thick layers.
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