Q: What is rebar used for?
A: Rebar is used as a tension device in reinforced concrete and masonry structures, such as buildings, roads and bridges; to add strength and hold the concrete in compression. Concrete is a material that is very strong in compression, but weak in tension. To make up for this imbalance in concrete's behavior, rebar is inserted into it, to carry the tensile loads.
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Q: When is rebar needed in concrete?
A: Concrete which carries heavy loads (such as footings, foundation walls, columns and roads) almost always requires reinforcing steel. Not all concrete work requires rebar. Concrete projects such as pathways, some driveways and small shed floors, generally do not require any steel reinforcing at all. However, adding steel rebar to smaller projects, will always give added strength.
Q: What are rebar sizes?
A: #3 #4 #5 #6 #7 #8 #9 #10 #11 #14 #18 are the standard US rebar sizes. US (also known as Imperial) bar sizes give the diameter in units of ' inch for bar sizes #2 through #8, so that #8 = 8'8 inch = 1 inch diameter. Bar sizes larger than #8 follow the ' inch rule imperfectly and skip sizes #12-13, and #15-17 due to historical convention.
Q: What are rebar couplers?
A: Rebar couplers are connections made to attach two pieces of rebar when lapping joints are not appropriate or allowed in a certain area of the job. Rebar couplers are nice because they can simplify a design and decrease the amount of rebar needed while keeping the same tension strength required.
Q: What is rebar fabrication?
A: Once detailed rebar plans have been approved, the rebar fabricator cuts, bends, and finishes the ends of each bar to specification with power equipment. This process must be done with great detail as it will be eventually shipped and used on a job site per those original engineered drawings.
Q: What is rebar threading?
A: Rebar threading is actually taking a piece of rebar at an end, using a machine that will carve it down while leaving a threaded helix end. Threaded rebar is used as an alternative anchoring method such as rebar couplers.
Q: Can rebar be bent?
A: Yes rebar can be bent. More likely than not, you will see bent rebar because it was fabricated to meet certain engineered drawings. Since bending steel alters its strength at the bend, it must be done very carefully to meet code requirements and avoid liability if the structure suffers a failure. If the bar becomes split or broken during the process, it gets tossed to the scrap heap and a new bar goes through the bending machines to replace it. Rebar is very strong, so machines in a fabrication shop are used to bend them to exact dimensions that will be later used to create a structure to strengthen concrete.
Q: Can rebar be cut?
A: Just as rebar can be bent, rebar can be cut. Cutting rebar can be done many ways such as a saw with a metal graded blade, using a torch to cut the bar with extreme heat, a band saw, or a shear. A shear press is what is used in professional fabrication jobs.
Q: How does rebar work?
A: Structural elements need rebar to carry the tension in the reinforced concrete. Rebar helps control concrete cracking due to shrinkage cracks from curing or from temperature changes. Concrete alone is very strong when dried but does not have tension strength to stop cracking and erosion. When rebar is in place before the concrete is poured, once poured they both form a bond that strengthens the structure as a whole.
Q: How much rebar do I need?
A: How much rebar you need will be different for every job. Rebar is needed to strengthen concrete and is required differently per amount of concrete and size of rebar that you are using.
Q: How do you connect rebar?
A: There are many ways to connect rebar. A few examples are Rebar couplers. Rebar couplers are connections made to attach two pieces of rebar when lapping joints are not appropriate or allowed in a certain area of the job. Rebar couplers are nice because they can simplify a design and decrease the amount of rebar needed while keeping the same tension strength required. Another way to connect rebar is through a simple rebar splice. This is a lapping joint that has a required lap length depending on the size of rebar that you are using.
Q: What are dowel bars used for?
A: Dowel bars are installed in a reinforced concrete footing to tie it to another masonry or concrete structure above it. For a home with a concrete footing, concrete block stem wall, and a concrete slab, the dowels will go into the concrete block cells, then bend into the slab itself, to tie everything together for structural strength.
Q: How do you tie rebar cages?
A: There are many different types of ties used to secure reinforcing bars to each other. For speed and security, we prefer a double snap tie. This keeps the rebar in position against displacement, due to transportation and concrete placing. The double snap tie is quite simple to execute. The tie wire is doubled over and then wrapped once around the crossing bars in a diagonal manner, with the wire ends on top. The wires are then twisted together with a pair of pliers until they are tight against the rebar. The wire is then cut with pliers. An additional twist may also be applied to guarantee the bars have a snug fit. Repeat the process at all junction points to complete the rebar cage.
What is a steel bar thread rolling machine?
The steel bar thread rolling machine is a machine that uses the advanced technology of stripping and rolling to process the straight threads of the connection ends of the steel bars. The steel straight threaded metal fiber processed by it is continuously dense and has good comprehensive mechanical properties. The tensile strength is increased by 20%-30%, the fatigue strength is increased by 40%-60%, and the corrosion resistance is increased by 50%-200%. The connection strength of the steel bar is higher than that of the steel bar base material, and the mechanical properties of the steel bar joint meet and exceed domestic and foreign standards. The steel bar rolling straight thread connection technology is suitable for industrial and civil buildings. It requires the connection construction of rigid, oblique, and horizontal steel bars in important parts of the structure that give full play to the strength and ductility of the steel bars. It has a simple and fast process, can be prefabricated, has no open flame operation, does not pollute the environment, has no hidden danger of explosion and fire, is safe and reliable, can be constructed all-weather, and saves a lot of steel and energy. Only a wrench is used to connect the steel bars, and each steel bar joint takes about one minute. The construction period of the structure was shortened, and the industrialized and civilized construction was realized.
Processing range and classification of steel bar thread rolling machine
The steel wire thread rolling machine can directly roll and process ordinary steel bars of Φ12, Φ14, Φ16, Φ18, Φ20, Φ22, Φ25, Φ28, Φ32, Φ36, Φ40, and other specifications and HRB335, HRB400, RRB400 steel bars.
The classification of thread rolling machines is relatively simple. According to the processing range, it is divided into 40 types and 50 types. There are three ways of operation. Semi-automatic, pneumatic, CNC type.
The working principle of the rebar thread rolling machine
1. Rebar clamping structure: Rebar clamping is accomplished by using positive and negative threaded screws to drive the clamping pliers to slide and self-center.
2. Thread head processing: clamp the steel bar, rotate the rib stripping thread rolling head, and perform axial feed to complete the thread processing. The rotation of the rib stripping thread rolling head is completed by the main motor through the reducer at a speed of 50 revolutions per minute. The feed is completed by the operator pulling the handle through the gear and rack to drive the reducer and the rib stripping and threading head to move along the slide bar.
3. Thread rolling wheel: The thread rolling wheel is composed of three pieces, which can be installed interchangeably, and the thread is formed at one time.
4. Tool advance and retreat: Turn on the main motor button, the motor drives the reducer and the rib stripping and threading head to rotate, the operator pulls the handle to feed, when the thread processing is completed, the stroke switch touch plate presses the stroke switch button, after a delay Reverse and return to the starting position and stop automatically.
Common accessories of steel bar thread rolling machine
1. Thread roller: There are four kinds of materials, namely, manganese steel roller, alloy roller, high-strength roller, and grade four steel roller. Manganese steel rollers can coupler PCS steel bars. Alloy rollers can coupler PCS steel bars. High-strength rollers can coupler PCS steel bars. Grade four steel rollers can coupler PCS steel bars.
1-Straight thread rolling machine suitable for construction engineering, 3 rolling wheels are a set, and the weight is about 4KG.
2-HRB335-HRB400 ribbed threaded steel bars, the processed steel bar joints have good strength
3-16-22 rebar can be rolled, outer diameter 79* inner diameter 30*thickness 45; 25-32 rebar can be rolled 71*30*45
4-How to distinguish the non-semicolon of the thread rolling wheel: the thread rolling wheel with a semicolon is divided into number identification (1, 2, 3); dot identification (number of dots 1, 2, 3); rolling without semicolon No logo on the side of the wire wheel
5-How to buy a thread rolling wheel with no semicolon: the thickness of the gasket is 6mm to buy without semicolon; the thickness of the gasket is 5, 6, and 7mm to buy with a semicolon.
2.Rolling machine blade: Two different sizes of thread rolling machine blades.
How to use the thread rolling machine?
(1) Preparation before processing
1. Connect the power cord and ground wire as required, and turn on the power supply. The power supply is a three-phase 380V 50Hz AC power supply. To ensure personal safety, please use an automatic switch with a leakage protection function.
2. In the coolant tank, add sufficient soluble coolant (adding oil coolant is strictly prohibited), also called an emulsion, cutting fluid.
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(2) Trial run on the empty car
1. Rotate the water pump button. Check whether the cooling water pump is working properly.
2. Press the forward, reverse, and stop buttons to check whether the electrical control system is working properly.
3. According to the specifications of the processed steel bar, adjust the position of the limit switch contact.
(3) Debugging:
1. According to the diameter of the steel bars to be processed, the corresponding size thread roller is selected. The relationship between the thread roller and the diameter of the processed steel bar is shown in the table:
2. Select the corresponding gasket according to the selected rolling wheel, see the table:
3. Select the corresponding test bar, adjust the size of the rib stripping device and the rolling wheel device. (The big end of the test bar is to adjust the size of the stripped rib, and the small end of the test bar is to adjust the size of the thread)
4. Adjust the position of the rib stripping stroke block according to the specifications of the processed steel plate to ensure that the length of the rib stripping reaches the required value. The relationship between stripped rib length and steel bar specifications is shown in the table.
5. According to the specifications of the processed steel bars, adjust the position of the rib stripping stroke block to ensure that the effective length of the rolled thread reaches the required value. The relationship between the effective length of the thread and the steel bar specification is shown in the table
(4)Workpiece clamping
Mount the steel bar to be processed on the jaws of the vise, and the extension length should be aligned with the end surface of the stripping blade of the rolling head at the starting position, and then turn the handle to clamp.
Precautions for use of steel bar thread rolling machine
1. The cooling liquid must be a water-soluble emulsified cooling liquid, the oil-based cooling liquid is strictly prohibited, and ordinary lubricating oil can not be used instead.
2. Rolling threads is strictly prohibited when there is no coolant.
3. The ends of the steel bars to be processed should be flat and must be cut with a toothless saw. And the end should be round and straight within the length of 500mm, and no bending is allowed, and it is not allowed to directly process the end of the gas cutting or cutting machine.
4. During the initial cutting, the feed should be even, do not advance too fast to prevent the blade from chipping.
5. Slideways and sliders should be cleaned and oiled regularly.
6. Iron filings should be cleaned up in time.
7. The cooling liquid tank is cleaned once every half month.
8. The reducer should be refueled regularly to maintain the specified oil level.
9. The rolling machine should be maintained regularly.
10. The housing of the machine tool must be reliably grounded before use.
IDEAL Rebar thread rolling machine
(1)HGS40
The rolling range is 16-28mm, the motor power is 4KW, the maximum length 80mm, and the machine weight is 300KG
(2)HGS50
The rolling range is 16-40mm, the motor power is 5.5KW, the maximum length 80mm, and the machine weight is 420KG
(2)HGS50pro
The rolling range is 16-40mm, the motor power is 7.5KW, the maximum length 150mm, and the machine weight is 500KG
Partner with IDEAL for your concrete line pump needs
Our rebar thread tolling machines are very user-friendly. For a customized quotation for a rebar thread rolling machine, a rebar thread rolling machine suitable for your business, please contact us immediately. Our friendly and knowledgeable staff members offer technical support 24 hours a day, seven days a week.
If you are looking for more details, kindly visit Rebar Threading Machine.
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