Hammer drilling rigs

Hammer drilling rigs. CONSTRUCTION. It is a mini-sledgehammer, perfect for light tasks like chiseling and driving mason drills into concrete. The MC 6 is a hydraulic drilling rig designed for specialized civil engineering works in tight and difficult-to-access spaces, such as inside buildings, basements, and small tunnels. Easy maneuverability in confined spaces or remote sites due to small footprint and wide track base. Follow +61 8 6200 9395 TOP-HAMMER DRILL RIGS / ECD SERIES STANDARD FEATURES TOP HAMMER DRILL RIGS (ECD SERIES) Greater Penetration and Performance! Rock drill - Optimized rock drill for best drilling - Unique,smooth & Fast auto rod change - ROPS & FOPS Certified cabin - 1200mm extendable boom standard Pre-cleaner - Wide & Easy to work Dust collector - Pre-cleaner standard - Strong dust collector with 6 filters Percussive Assisted Rotary Drilling – PARD. As a subsidiary of BAUER Maschinen GmbH, BAUER 20,000 Lbs. As the World's One-Stop Foundation Shop®, International Construction Equipment, Inc. Robust universal drilling boom creates ideal face drilling coverage. 2537. Dino™ DC410R is a versatile top hammer drill rig designed for easy maneuverability in the toughest terrain. Customers have been the key focus for the down-the-hole team throughout the years. Great West Drilling’s AP1000 Becker Hammer Drills are designed for use when difficult drilling conditions are encountered. [1] [2] It is a type of rotary drill with an impact mechanism that generates a hammering motion. * DTH Hammer Bits--- large assortment of sizes and shanks. This is achieved through increased penetration rates which lower the total cost of drilling (TCD). Feb 6, 2020 · Like RAB, RC drilling uses a piston-driven “hammer” to drive a tungsten-steel bit into the rock, though the use of larger rigs and machinery allows holes to be drilled much deeper. Drill faster because of the hammer’s improved air cycle. Get more information. They’ve put out pretty high-powered machines that can do quite a bit of work on the geotechnical side. Pantera™ DP1100i is a hydraulic, diesel-powered, self-propelled top hammer drill rig ideal for production in large quarries, open pit mines and construction sites. The K1 Drill Mast uses high power DTH hammers for pre-drilling hard rock, increasing your production speeds. A drilling hammer is a handy tool that will have your back in several settings. Simply defined, PARD is the next viable choice to drilling faster and more efficiently. The drill bit, drill rod, coupling sleeve, and shank adapter are connected by their threads to form a rock drill string. Boart Longyear is committed to ongoing investments in industry-leading Welcome to BAUER Equipment America, Inc. Find our expert engineered rock drills designed to tackle heavy-duty work with unrivalled efficiency and durability. It requires a separate compressor to drive the hammer and bit combination. First, we will profile the air rotary system followed next by the down-the-hole hammer. Rock drill from Sandvik guarantees good penetration rate. TEI Cylinder or Chain Style Feed System. Water Pump. 01 / Top Hammer Drilling Tools. Mud Pumps & Systems 135. The surface top-hammer drilling rig is a kind of multi-purpose surface drilling equipment with small installed power and weight. Depending on the terrain, you can choose between different types of drilling rigs: rotary drilling rigs, percussion drilling rigs, down-the-hole drilling rigs, top hammer drilling rigs (with high hammer), etc. Choose from the KLR Universal, the best Water Well Drilling Rigs Manufacturers of India also Manufacturer Drilling Accessories like DTH Hammers, Cluster Hammers, Rock Roller Bits and API Drill Rods. ” Equipped rock drill with 20kw and most advanced drilling control system, together with the mechanical rod changer and anti-jamming design, which makes the rigs efficient and reliable, MT800 is the ideal choice for medium size quarry and surface mining. Automatic SPT Hammer System. Welcome to the “Used Drill Rigs” section of the Geoprobe ® website. Ranger™ DX800 is a hydraulic, diesel-powered, self-propelled top hammer drill rig with an ergonomic cabin and rod handling system. Pull Down. 5 meters (H x W) or larger production drifts. SANDVIK. 5 (110 kW, Stage IIIA) Sandvik DL421 is a versatile longhole drill rig engineered for large-scale production drilling in underground mines. Additional advantages of the industry benchmark 7822DT combination drill rig include: Powerful performance to complete wet, air, and hollow stem jobs often reserved for strictly rotary drilling rigs yet easily converts for direct push jobs. We provide innovative mining equipment, consumables and services for drilling and rock excavation. Engines & Generator Sets 137. ”. Dino™ DC420Ri. For the past 40 years and still today, our goal is to produce the best products for our customers. As a manufacture of Down-The-Hole drilling equipment for over 30 years Holte has been able to develop a line of Conventional and Reverse Circulation Bits to compliment the DTH Hammer. The down-the-hole hammer uses the rotary percussion cutting action through the use of a button bit. It is mainly used for drilling hard or medium hard rocks and can drill blast holes with a diameter of 33–230 mm and a depth of 15–30 m. 3 meters) deep in a single pass, but maximum depth ultimately depends on the size of the mast and the rig as well as the length of the drill string. You typically only excavate the material for the diameter of the bore you’re drilling. Typical applications are road cutting, pipeline drilling, foundation drilling and production drilling in medium size quarries and open pit mines. The rigs can be taken to challenging job locations, drilling contractors usually have machines available with short notice, and they tend to be cheaper than DTH or rotary drilling rigs. Air Rotary 0-90 RPM. SAFETY EXCELLENCE. S. 586. ) hole sizes. 14 kW. Parts 1518. COM TECHNICAL SPECIFICATION IN BRIEF TECHNICAL DATA RANGER DX500 RANGER DX600 Recommended hole-diameter 51–89 mm / 2”–3½” 64–102 mm / 2½”–4” Drill rod / tube diameters 32, 38, 45 mm 1¼”, 1½”, 1¾” 38, 45, 51 mm Drill King International is one of few that offers the largest range of hammers and bits available in the industry today. Comacchio CH 450. As some of the most common drilling tools used today, rotary tools offer multi-faceted surfaces that turn in order to bore into Truck Mounted Versatile Well Drilling Rig. First, because it is an air rotary drilling method, there is no secondary waste stream generated like one would see with mud rotary or other methods. Whether the application is surface and underground mining, infrastructure, civil works, well drilling or geotechnical, Mining and Rock Excavation Technique will ensure to increase customers’ productivity. A remotely radio-controlled hydraulic, crawler-based surface drilling unit, Dino™ DC420Ri is designed for drilling 51 to 76 mm (2 to 3 in. The percussive mechanism provides a rapid succession of short hammer thrusts to pulverize the material to be bored, so as Hütte. The D-120 by Diedrich Drill is a heavy-duty, multi-purpose drill rig. Travelling, crawler balance and frame rotation of drilling rig can be equipped with optional wireless remote control function for operation outside the cab. We stock a rental fleet of CZM drilling rigs and piling rigs, HMC Movax side grip vibratory hammers, HMC STR20 solar pile driving rigs, and Anvil In-house engineers design and build state-of-the-art rotary drill rigs that feature state-of-the-art technology like auto-drilling and hands-free rod handling. 150mm~255mm. Available for excavators and skid steers in 12-, 15- and 20-foot stroke units for pre-drilling Ranger™ DX810i has a selection of rock drills from the powerful RD900 rock drill family (21 kW - 25 kW), making the drill rig suitable for several applications, like road cutting, pipeline drilling, foundation drilling and production drilling in medium size quarries. Commando™ DC300Ri drill rig is a hydraulic, self-propelled, compact drilling unit on a four-wheel oscillated drive carrier with full radio remote control. Jul 29, 2023 · Custom built tools to fit any drilling rig. 3. Now that we’ve discussed the different types of drilling systems and mounts, let’s look at the various types of drilling tools available. With up to 8,800 ft lbs of spindle torque with a 115HP John Deere T4 powerplant, it can power through tough jobs! Diedrich d-50 Robust, Reliable, Multi-Purpose Drill Rig View More Information & Compare To Other Rigs Here! Give us a tool free call at. Mar 14, 2019 · Note: Machines shown in pictures may be equipped with SURFACE TOP HAMMER DRILL RIGS options. Acker Drill Company is a world leader in the manufacture of drill rigs and tooling. Center Rock, Inc. 140lb. It is designed for vertical and inclined plane rings and fans, as well as parallel long production holes and long single holes. Rotation head is a key component in DTH drill rigs that ensures the drill rig’s high availability and reliability. It provides stability and produces a range of drilling information, including drill condition and work performed. With this advanced down the hole drilling system, you’re not just making holes—you’re making quality holes in record time. The Pit Viper series delivers a hole diameter ranging from 6 inches to 16 inches, and a pulldown range from 60,000 lbs 125,000 lbs. 875″ (200 mm) self-rotating rock hammer bit. Whether your need be for an air compressor, cluster drill, air support module or downhole hammer, we got you covered! Drill bit (#26) is a device attached to the end of the drill string that breaks apart the rock being drilled. KL510 top hammer drilling rig is equipped with standard drill rod of 45/38mm diameter to drill vertical, inclined and horizontal blast holes of 64-115 mm. This system usually consists of a truck mounted drill and separate support vehicle, which carry 710 Shady Lane Rd. ㆍGenerally, the hole depth is less than 25 meters. Typical applications are road cutting, pipeline drilling, foundation drilling and production drilling in medium size quarries. 12 / 26. Read more. Hydraulic Top Hammer Drilling Rig. Hütte hydraulic drilling rigs are used for micro piles and ground anchors, enhancement of existing foundations, construction of new foundations, ground stabilization, and soil BEV - 3 km in 1:7 ramp upwards. The history of the down-the-hole hammer manufacturing goes back more than four decades. what we do. Our drills provide ample power and versatility to reach target drilling depths in all types for soil conditions and rock formations. Alluvial deposits, glacial deposits, mine dumps, tailings piles and other challenging overburden formations are efficiently penetrated and accurately sampled using the Becker Hammer Dual Tube Reverse Circulation drill pipe. We specialize in custom designs for those tough and unusual drilling conditions. Rotation head options. Holte’s standard Bits are available from several inches to 43″ (1092mm 1. Our smallest multipurpose geotechnical drill rigs, with a built-in SPT autohammer. 2 Winches, Line Pulls to 22,000 Lbs. We are an ISO 9001:2015 certified company having wide global presence with world class quality products and services which provide most affordable and reliable The HCM Skid Steer Attachment is designed to enhance the functionality of skid steers and can be mounted on most models using the universal mounting plate. Oct 6, 2023 · Below are some of the key advantages that make DTH Hammer Drilling a standout option: Optimized for Hard Rock: This method is particularly effective in hard rock formations, where other drilling systems may struggle. HCM Mount with 360-degree Positioning. Products. Hammer & Steel Inc. youtube. ㆍ The slag flushing medium is compressed air or water. Hammer Drilling Rigs is now a Mincon Group Plc company. and Canada. No listing charges. It’s ideal for construction contractors, cramped conditions, quarries and demanding municipal infrastructure projects. Furthermore, it handles heavier jobs, like punching walls and driving drills into concrete. Rotary and percussive drilling of the drill string under compressed air supply. 4 kN (70,000 lbf), and pulldown capacity of 133. 4. On the drilling consumable side, top hammer drill string is also cost-efficient, fast to set up and, thanks to the wide range of available bit designs, top Top Hammer XL is the latest innovation in surface top hammer drilling from Sandvik Mining and Rock Solutions. This is a free service we offer for listing used drilling rigs for sale and other drilling equipment. Contact Us. Final Word. Machinery and equipment from BAUER has been a byword for top performance and quality as well as for continuous innovation. com or by phone at 610-354-9552. From drilling to safety equipment. MC-E Line Attachments. 1 AMS PowerProbes have gained widespread acceptance in many industries due to their versatility, relatively low cost, and ease of mobility. Phone: 570. Specializing in sales & support of drill rigs, survey tools, casing systems & water hammers. Menu. PDAC – Toronto, ON - March 2 - 5, 2025. In fact, one of the deepest holes on record was drilled to SREPS Manufacturers and Supplies specialty Hammers & Bits, DTH Equipment, RC Exploration Drill Rigs and customised parts for whatever ground conditions you face. Second, ARCH allows you to set a surface casing without dedicating permanent materials like steel and grout. Using a drilling rig worth hundreds of thousands of dollars to pre-drill foundation piles can waste valuable production time. We can rebuild your drill rig, compressor, booster, air end, drifter, hammer or drill bit. It has the process of rock drilling and hole formation such as impact, rotation, ballasting, and advancement, and it belongs to percussion rotary drilling. We custom fabricate each LP DRILL to match our customers May 1, 2024 · Choose from a Featured, Image or Text Classified which allows you to take advantage of our direct audience and searches on the web. Fluted Kelly (only for HT option) High Rise Pump Mount. Drilling Tools. Request a quote. The LP DRILL is designed for drilling soft to extremely hard rock formations. bottom of page. Rick Mielcarek, Operations Manager, TTL Associates, Ohio. The working principle of the down-the-hole hammer drill rig is the same as other rock drilling rigs. It provides excellent mobility and stability for urban construction sites, quarries and infrastructure applications. Boart Longyear equipment is designed for safety and field-tested for compliance and reliability. AEMA – Reno, NV, December 1 - 6, 2024. Ranger™ DX700 is a hydraulic, self-propelled, self-contained and crawler-based surface rig with an ergonomic, high-visibility cabin and rod handling system. com/c/MinconGroup. Down the Hole Drilling Method. For difficult drilling conditions such as gravel, boulders, sands and cobbles, and other unconsolidated formations, the Becker Hammer Air 3126GT Geotechnical Drill Rig. This drilling rig is designed for auger drilling in soft to general ground. Phone: (785) 825-1842. Leverage the drill rig across a number of applications thanks to the available rock drill options, including a new long-piston RD930C rock drill designed for efficient drilling of larger hole sizes. Choose from a range of rigs for simple testing options to the most versatile equipment with powerful rotary auger drill head, dual anchor masts and 20 ton twin hydraulic drive cylinders that allows for 20 ton CPT testing, DMT testing, Shelby tube testing and direct push sampling. Our rental department can assist you on your daily, weekly or monthly project. Diamond Drill 0-600 RPM. Rent or Purchase Construction Equipment. 5 (119 kW Tier 3) Sandvik DL422i is a fully automated, top hammer longhole drill, designed for underground mass mining in 4 x 3. mincon. With a deep-rooted commitment to quality, we stand out as a trusted provider of top hammer drilling rigs, renowned for the performance, reliability, and durability of its products. Percussion rate. No need to move the geotechnical drill or drill mast on the compact, off road drill rig. 44~72mm. Setting the DTH hammer with drill rod and casing on the drilling point. Rotary Tools. With the larger head and additional weight of the 3230DT we can now run 6 and 8-inch DTH hammers with larger API rods very efficiently. KING KONG’s complete range of Top Hammer drilling tools is designed to transmit intensive impact power into the rock, while at the same time reducing loss of energy. 752. Air Compressor. Length. Hydraulic Chuck. RPI Construction Equipment specializes in selling, servicing, and renting piling driving equipment, drilling rigs, clamshell buckets, crane rock grapples and solar pile installation equipment. We stock a wide variety of solutions for all types of applications including low overhead and limited space job sites. Hydraulic Rod Holder & Breakout Wrench. is the leading international manufacturer and distributor of vibratory drivers and extractors, diesel hammers, hydraulic hammers, excavator-mounted rotary heads and hammers, large and small-bore drill tooling (including EDME Kelly Bars), limited access drills The Mobilram system offers a self-contained package that can be configured for a wide variety of pile driving and foundation installation work. Equipment & Tooling 18. Down Hole Hammer Drilling Bits – Foundation, Well and Bridge Construction Tools. It is considered the main area Welcome to BAUER Equipment America, Inc. South Abington Twp, PA 18411. If you’re looking for used drilling rigs for sale, check the website often because our previously-owned Geoprobe ® machines move fast! No fees. Trucks - Pump Hoist, Service & Water 72 “To me paying for an auger drilling rig or rotary drilling rig limited unit is a lot to pay versus the additional for a multi-application capable 3230DT based on the return. Toll Free: 800. BAUER Maschinen GmbH designs and manufactures rotary drilling rigs, foundation cranes, diaphragm wall equipment and all related tools. 5 to 7 inches) in diameter. It also has similarities with aircore drilling in its use of compressed air to drive the dry rock chips up the inner tube. Vertical drills can Feb 3, 2023 · It consists of rock drill, propeller, drilling rod, chassis, and driver’s cab. Jun 22, 2020 · June 22, 2020. com/rockdrills for more information on our rock drilling rigs and masts or to talk to a s Benefit from the versatility provided by Ranger™ DX910i’s expanded rock drill selection (27 - 30kW). It drills vertical and inclined fans and single or parallel longholes up to 54 m in depth. Next level relaibility for drilling and bolting. Our customers around the world use Numa’s deep hole drilling products in a wide range of applications from just a few feet to 1000’s of feet/meters deep. The MT series jumbo drilling rig is a hydraulic top hammer drilling rig designed for a 12-35m3 cross section for use in underground mining projects. Fax: 570. Pantera™ DP1100i. A carbide-studded shoe, welded to the bottom casing joint, cuts through the overburden. Less air is needed, making the penetration rate higher. Whether you are driving pile, drilling, or dredging, we have equipment solutions including pile driving rigs, drill rigs, or attachments for excavators and cranes. Mounted on pickup trucks, trailers, UTVs, skid loaders, tractors, or tracks, AMS PowerProbe direct push drill rigs are capable of performing soil, soil gas, and groundwater testing, monitoring, and sampling, as well as conducting a wide variety of Commando™ DC130Ri. ㆍThe most suitable for hole diameter between 25–127 mm. 5 meter (H x W) or larger production drifts. (+86) 176 3857 1343. This is made possible by the machine’s extremely compact dimensions and wide range of movements. Equipment Corporation of America is the North American leader in the distribution and service of drilling and pile driving foundation equipment for leading brands like Bauer, Klemm, RTG, Allu, Pileco and Betek. Salina, Kansas 67401. Find new and used drill rigs for sale in the The Driller classifieds. The exceptionally powerful motor for its weight category and the The CENTER ROCK Low Profile Cluster Drill features a group of individual 6″ (152 mm) class low volume down the hole air hammers, each impacting a 7. Sold Products 2. Pathfinder Africa supplies products across the range of exploration drilling – including: drill rigs, drill rods, diamond tools, survey tools, workshop tools, geological equipment, top hammer tooling, underground rigs, rock drills, vehicles, and safety equipment. 2. Standard Features of the HCM: TEI Patented Drifters or Rotary Heads. The hardness of the rock is less of an issue due to the hammer’s force. The new, groundbreaking drilling system, targeting large-scale quarry and surface mining customers, offers a faster, more fuel-efficient and more cost-effective way to drill holes 140 to 178 millimeters (5. Commando™ DC130Ri is a fully remote-controlled, rubber-tired top hammer drill rig designed for road construction, demolition works and other applications. is a leading supplier of drilling and pile driving equipment for construction sites throughout the U. Efficient Fragmentation: The hammer efficiently 710 Shady Lane Rd. Litian provides standard and heavy-duty series top hammer drilling rig tools, suitable for drilling in soft rock, medium-hard rock, hard rock, and various complex mixed rock working conditions. Smaller piling crew sizes, as well as fast and accurate driving/extracting, combine for Dec 20, 2023 · Top Hammer Drilling Rig. SMEA – Denver, CO - Feb 23 - 26, 2025. This drilling rig is fitted without a compressor on-board the same carrier. Ranger™ DX800. Manually Operated Hydraulic Controls. This down-the-hole (DTH) drilling rig is designed for percussion drilling in hard rock. JK830 Integrated DTH Automatic Drilling Rig JK830 is an Integrated hydraulic DTH drilling rig dedicated to drilling large bore holes (138-235mm) which brings you more automation, higher working effi Borehole Diameter 138-235mm Borehole Depth 30 meters. We offer hammers for drilling holes from 2-3/4"- 42" in diameter. Roundup – Vancouver, BC - Jan 20 - 23, 2025. The differences between the air rotary system and this drilling system are primarily the cutting action and the resulting cuttings. 2061. After reaching the final depth, unlocking of the drill rod with DTH hammer and pilot bit. It is necessary to determine what the drilling rig will be used for, as well as what kind of terrain it will mainly be operating on. Easily moved from one location to another, it is perfect for contractors working in variable applications. By staff count the service department is our largest department and we continue to invest to strengthen our after sales support further. , sells and rents a full line of Comacchio multiuse ridged and articulated hydraulic crawler drill rigs in the U. 2659. Upgraded features make this a versatile, productive machine with exceptional mobility and intelligence. Great West Drilling's AP1000 Becker Hammer Drill incorporates several drilling methods in one rig. The D-50 is Diedrich's premiere, all-purpose drill rig for the environmental and geotechnical drilling inudstry. Visit www. We perform repairs on all makes and models. Hammer & Steel sells and leases the industry's most respected lines of low headroom drill rig equipment from ABI, Comacchio, Delmag & SoilTek. Jan 3, 2024 · Hammer & Steel, Inc. A hammer drill, also known as a percussion drill or impact drill, is a power tool used chiefly for drilling in hard materials. Our world class service center for drilling rigs and other drilling equipment in Dubai Investment Park was opened in 2020 and ALBARIQ has a total of 7 service centers throughout UAE, Saudi Arabia and Qatar. As an industry-leader in the field of drilling solutions, Drillrigy pioneers innovative and practical technology for both common and complex drilling needs. Hydrostatic transmission (diesel) QSB4. Hammer & Steel is a leading supplier of pile driving and drilling equipment for construction sites A blue square icon with red Hammer & Steel lettering. ㆍ Adapt to a stable and uniform hard rock. By carefully selecting pile drivers, diesel hammers, drill rigs, and other piling products from manufacturers all around the world, we can ensure that we will not only have the right equipment for your job 1835 Wall Street. Each person in engineering, production, marketing and sales is committed to We would like to show you a description here but the site won’t allow us. Hydrodynamic transmission (diesel) B4. Drilling Equipment & Tooling 843. The PV-230, PV-270, and the PV-310 offer single-pass and multi-pass options Latest News & Press. It contains jets through which the drilling fluid exits. It reduces emissions while tramming, creating a healthier and safer working environment. 4 kN (30,000 lbf) The drill is designed for water well and other applications requiring air or mud rotary and down hole hammer drilling methods. There are some rotary drills, for example, that can dig to almost 20,000 ft (6,100 m) below the surface in multiple passes. Other benefits include straighter drill holes, easier hole collaring and increased productivity. The air rotary drilling system is primarily designed for drilling and consolidated formations, offering good penetration rates and quick cuttings removal. The lower drive transmits pulldown, pullback and rotational forces to the casing. As a subsidiary of BAUER Maschinen GmbH, BAUER We have a complete line of hydraulic top-head drive drilling rigs, designed for water well drilling and other applications requiring air or mud rotary as well as down-the-hole hammer drilling methods. Jul 28, 2021 · Learn the basics of DTH hammers and how they work. Triple H Auger. Featured Products 1. has sales and service responsibilities for the Hütte drilling products within the defined area of responsibility shown below in yellow. DTH Hammers & Bits 338. Sep 1, 2006 · The distinguishing feature of a dual rotary rig is a lower rotary drive, which is used to independently advance casing up to 40 inches, depending on the drill model. Please visit the main Youtube Channel at https://www. Sandvik DL422iE is a fully automated, battery-powered top hammer longhole drill, designed for underground mass mining in 4 x 3. For more information on purchasing a classified ad in The Driller, please contact Mike O'Connor @ oconnorm@bnpmedia. Drill floor (#21) is the area on the rig where the tools are located to make the connections of the drill pipe, bottom hole assembly, tools and bit. Initial erection as well as changing from driving to drilling tools can be accomplished in less than one hour. RockTech USA is a drilling products & service provider. Parts. . “Geoprobe ® is not just a direct push, environmental, shallow boring company. This drill is a powerhouse in the geotechnical, exploration & environmental drilling industries. ㆍ High efficiency in shallow holes drilling, the deeper the lower efficiency. 110 Hz. Automatic parallelism and 360 degree roll over enable easy, fast and accurate positioning for face drilling, sideways The Epiroc TH60DH water well drill rig is a truck engine/PTO for DTH, rotary air, and mud drilling with a pullback capacity of 311. Withdrawal of the drill rod, DTH hammer and pilot bit out of the casing. Get more information Request a quote. Apr 3, 2023 · Some models can drill holes in excess of 60 feet (18. Save time and effort swiftly sliding the innovative centerline head side shift into position for rotary, automatic drop hammer, event CPT or direct push. Our value series drills a hole diameter ranging from 5 1/2 inches up to 9 7/8 inches, and a pulldown range from 30,000 lbs to 75,000 lbs. The drilling hammer is heavier and has a longer handle. sk dl la jq ka ma kt qz ua vo