When there is no coolant, it is forbidden to roll and process threads.
4) It can connect horizontal, vertical and oblique HRB335 and HRB400 reinforcement with the same diameter or different diameter.
4) The hydraulic oil pollutes the reinforcement, which is troublesome to clean.
2) Tensile performance inspection (1) 500 joints with the same specification, grade, material and construction conditions shall be regarded as one acceptance batch for on-site inspection, and less than 500 joints shall also be regarded as one batch.
The operation instructions and dangerous matters of reinforcement processing machinery shall be pasted on the working wall so that the processing operators can watch at any time.
Mechanical switches adopt leakage protectors.
safe and civilized construction 1.
If one of them is still unqualified during re inspection, the batch of joints is unqualified.
Safety helmets must be worn when entering the construction site, and fireworks are strictly prohibited in the construction site..
(4) Before the formal construction, the extrusion connection process test under the field conditions shall be carried out.
Disadvantages: 1) the labor intensity of on-site construction is high, and three people are required during operation.
If there is wear, they must be replaced.
3.
2、 Classification of reinforcement mechanical connection: there are many kinds of reinforcement mechanical connection.
Before use, the reinforcement machinery and electrical equipment entering the site must be inspected and accepted by the project engineering department and the safety and quality department and reported to the supervisor for acceptance before use.
When cutting short materials, keep the distance between the hand and the cutter more than 150mm.
5.
2) Large material and high cost.
Straight thread sleeve: sleeve whose inner hole is straight thread; Rib stripping and rolling straight thread connection of reinforcement is to strip part of the longitudinal rib and transverse rib at the end of the reinforcement to be connected by cutting, and then roll it directly into ordinary straight thread, which is connected with a special straight thread sleeve to form the connection of reinforcement.
(5) During appearance inspection, three test pieces are selected from the joint for tensile test.
The formal construction can be carried out only after the test is qualified.
The technology of rib stripping and rolling straight thread connection of reinforcement is a technical invention at home and abroad, reaching the international advanced level; Rib stripping and rolling straight thread connection technology, convenient and fast construction method, energy saving, consumption reduction, benefit improvement, stable and reliable connection quality have been favored by the majority of construction units and owners.
2.
If the strength of one test piece is lower than the design value, the batch of joints is unqualified.
4.
Sample display: III.
3) It is not suitable for high-density reinforcement.
7.
Taper thread sleeve: a thread sleeve whose inner hole can be connected with the taper thread of the reinforcement is a taper thread; 3.
2.
When lifting the reinforcement, it shall be bound firmly.
It is a necessary tool for reinforcement on-site construction.
The installation of machinery shall be solid and stable.
There is no electricity for construction.
The process inspection shall also be carried out before the mobilization of different batches of reinforcement in the construction.
Cold extrusion sleeve is a processing method that puts the metal blank in the cold extrusion die cavity and applies pressure to the blank through the punch fixed on the press at room temperature to make the metal blank produce plastic deformation.
2) The reinforcement connecting sleeve can be prefabricated in advance, which does not occupy the construction period and has high processing efficiency.
It is a new product of straight thread connection technology.
Construction process flow of welding sleeve, split sleeve and straight thread sleeve: ★ pre connection: flat end of reinforcement → rib stripping and thread rolling → thread head quality inspection → connection with sleeve → joint inspection; ★ on site connection: rebar in place → unscrew rebar protective cap and sleeve protective cap → tighten the joint → mark → quality inspection.
3) The connection is convenient, fast and simple.
(3) Bending at joint ≤ 40.
The shell of the wire rolling machine must be firmly grounded before use; The slideway and sliding block must be regularly sorted out and oiled, and the rib stripping knife and wire rolling wheel must be regularly inspected and replaced; The cooling liquid of the wire rolling machine must use water-soluble emulsified coolant.
The finished products and semi-finished products processed on site shall be in order and placed neatly by category.
This kind of connection method has been developed in China in recent 10 years.
According to the type of reinforcement mechanical connection joint, it can be divided into straight thread sleeve, cone thread sleeve and extrusion sleeve.
The inspection results shall meet the requirements of jgj107-2016.
Sufficient lighting must be provided at the reinforcement processing machinery to ensure that the operators operate in a good light environment.
The minimum indentation of the joint shall meet the provisions in the above table.
The hook can be removed only after it is in place and supported.
The reinforcement processing machinery shall be maintained by special personnel, and the parts of various machinery, especially vulnerable parts, shall be inspected regularly.
All electrical and mechanical enclosures must be reliably connected with the protective grounding wire.
Advantages: ★ stable and reliable joint quality; ★ not affected by the chemical composition of reinforcement; ★ the influence of human factors is small and the operation is simple; ★ fast construction speed and not affected by climatic conditions; ★ no pollution, no fire hazard, construction safety, etc; ★ in the connection of coarse diameter reinforcement, the mechanical connection method of reinforcement has broad development prospects.
Reinforcement mechanical connection is a new reinforcement connection process, which is called the “third generation reinforcement joint” after binding and electric welding.
When processing materials, bending machine, cutting machine, etc.
It has the advantages of joint strength higher than reinforcement base metal, speed 5 times faster than electric welding, no pollution, saving 20% of steel, etc.
It is made of steel and can be tightened φ 16－ φ 40mm steel is easy to use and fast to tighten.
Advantages: 1) it has strong adaptability to reinforcement and can be constructed without prefabrication in advance.
Overload lifting is strictly prohibited.
Features of steel bar connecting sleeve: 1) the use of steel bar connecting sleeve produced by our company can greatly reduce the use of materials, and the operation is simple and not limited by the type of steel bar composition.
Extrusion sleeve: the inner hole is a smooth hole, which is used for the extrusion connection of ribbed reinforcement.
It is strictly prohibited to mix long and short hoisting.
For process inspection, there shall be no less than 3 test pieces of each specification.
1、 Introduction and definition of mechanical connection of reinforcement: it refers to the connection method that transfers the force in one reinforcement to another reinforcement through the mechanical bite of the connector or the bearing action of the end face of the reinforcement.
The main person in charge, technical director, technicians, full-time (Part-time) personnel of safety and quality of the project department, operation team leader (Foreman) Test and inspection personnel must receive professional training and assessment on mechanical connection process and quality control of reinforcement; Operators who process reinforcement joints on site must be trained by professionals and take up their posts with certificates, and hang a sign next to the machine to indicate the safety operation procedures.
If the hand holding end is less than 400mm, press or clamp the short head of reinforcement with casing or clamp.
It can be constructed all day.
2) The joint quality is stable and reliable, and the joint performance is easy to meet the class I requirements in yb9250 standard.
The protective cap of rebar sleeve is screwed to the rebar sleeve to prevent the rebar sleeve from falling into the sundries inside the rebar sleeve during construction and affecting the rebar connection strength.
(2) There shall be no visible cracks on the joint surface.
When lifting the reinforcement framework, the framework shall not be close until it falls within 1m from the ground.
6.
The most widely used straight thread sleeve can be divided into upsetting straight thread sleeve, rib stripping rolling straight thread sleeve and direct rolling straight thread sleeve.
(3) If the tensile strength of one test piece does not meet the requirements, another 6 test pieces shall be taken for re inspection.
Cutting of reinforcement Inspection methods for construction quality of rebar connecting sleeve with protective cap during rebar wire head processing 1) appearance inspection of construction quality (1) check whether the crimping passes meet the design requirements, and there shall be no less pressing, heavy pressing and other phenomena.
(4) The inspection marks are exposed on the reinforcement at both ends of the joint, but the positioning marks are not exposed.
All electrical switches must implement one machine, one switch, one leakage and one protection.
1.
When the uniaxial tensile test results of the three test pieces meet the requirements of jgj107-2016, the batch of joints is qualified.
A special person shall be assigned for command, and no one is allowed to stand below.
are strictly prohibited from over loading at one time.
Protective cap of rebar sleeve thread head the protective cap of rebar thread head is used to put a safety cap on the rebar thread head in order to prevent rust and thread damage during handling after the rebar thread is sleeved.
(2) Three test pieces randomly selected from each batch of acceptance pieces are evaluated.
