What are the safety precautions for steel bar processing?

Question 1: Safety precautions for steel bar workers. When steel bar workers enter the site, they must abide by the six disciplines of safety production and safety operation procedures. Wear safety helmet and headgear; Fasten your seat belt and fasten the safety buckle when working at heights, so as to hang high and use low.

2, it is forbidden to wear high heels, slippers, barefoot or drunk into the site.

3, don't understand electrical and mechanical personnel, it is strictly prohibited to use and fiddle with.

4. It is forbidden to throw materials, tools and other items down or up from a height.

5, after entering the site, found that there are hidden dangers in the workplace, should report in time, and easy to handle.

6. Do not command or operate illegally, and observe labor discipline.

7. Please maintain civilization and professional ethics at the construction site.

8. Smoking is prohibited in the construction site, and it is not allowed to play with each other, play or climb the protective railing of the hand frame.

9, do "three no harm", that is, I don't hurt others, I don't hurt myself, I don't get hurt.

Question 2: Safety precautions for rebar processing in winter 1. Winter construction of reinforcement engineering

The temperature is cold and windy in winter. Under the condition of negative temperature, the mechanical properties of steel bars have changed significantly: the yield point and tensile strength have increased; Elongation and impact toughness decrease, but brittleness increases. In winter, the toughness of welded steel joints will also decrease. If the welding process is not well mastered, the plasticity and toughness of steel bars will decrease and the comprehensive performance will deteriorate. If the welded joint cools too fast or comes into contact with ice and snow, it will also produce hardened structure, which will affect the use of steel bars.

The main problem to be considered in winter construction of reinforcement engineering is negative temperature welding of reinforcement.

If the project has a basement, there are three types of rebar joints: straight thread connection, welding and lap joint. Under winter construction conditions, negative temperature welding is particularly important.

The following technical measures are proposed for negative temperature welding of steel bars in this project:

(1). The rebar welding is arranged indoors (rebar butt welding workshop). The steel bar welding workshop is enclosed on three sides, and the top is covered with metal tile to prevent rain, snow and wind (the gap is leeward);

(2) The butt welding of steel adopts preheating-flash welding process. Before the flash process begins, the steel bar should be contacted for many times to increase the temperature of the steel bar, which is beneficial to the smooth flash process. During butt welding, the adjustable length of reinforcement increases by 10%, the transformer series decreases by one level, the contact pressure increases appropriately during preheating, and the intermittent time of preheating is also extended appropriately;

(3) After butt welding of steel bars, cover the joints with rock wool (or lime powder) for thermal insulation, so as to make them cool slowly and avoid immediate contact with ice and snow;

(4). In the process of processing, transportation and binding, attention should be paid to prevent the original performance of steel bars from being damaged by impact and scratch;

⑤. Covering protection measures should be taken for steel bars piled in the open air to prevent the surface from freezing. Before pouring concrete, clear the ice and snow on the surface of the steel bar; Enter the next working procedure as soon as possible after the steel bar is bound and formed.

Question 3: Precautions for reinforcement engineering 1. For some important components, such as crane beam, thin web beam, lower chord of passenger frame, etc. It is not suitable to replace HRB335 and HRB400 ribbed bars with HPB235 round bars.

2. After steel bar substitution, the minimum diameter, spacing, number of steel bars, anchorage length and other requirements of steel bar structure should be met.

3. In the same cross section, different kinds and diameters of substitution steel bars can be configured at the same time, but the tension difference of each steel bar should not be too large (because the diameter difference of each steel bar is generally less than 5mm), so as to avoid uneven stress on the members.

4. The longitudinal reinforcement and bending reinforcement of beam should be replaced separately to ensure the strength of normal section and inclined section.

5. When eccentrically compressed members (such as frame columns, crane workshop columns, upper chords of trusses, etc.). ) or eccentric tension members for steel bar substitution, do not calculate the reinforcement amount of the whole section, and should be substituted according to the stress surface (compression or tension) respectively.

6. When members are controlled by crack width, such as replacing large-diameter steel bars with small-diameter steel bars and replacing high-strength steel bars with low-strength steel bars, it is not necessary to check the crack width.

Question 4: What safety precautions should steel bar workers pay attention to when making column and wall reinforcement? When making steel bars, attention should be paid to electricity prevention and machine use (bending machine, straightening machine, cutting machine, etc.). )

Second, the finished product transportation, finished product stacking (don't hit people, stacked to prevent dumping)

You can find the safety disclosure of steel bar operation on the internet, which will have it.

Question 5: What requirements should be included in the safe operation requirements of reinforcement engineering? 1. Before starting, you must check whether there are cracks in the tool, whether the bolts of the tool rest are fastened and whether the protective cover is firm. Then turn the pulley by hand, check the gear fit clearance and adjust the clearance between the cutters.

2, after the start, idle running first, check the transmission part and bearing normal operation rear can use.

3. When the machine does not reach the normal speed, it is not allowed to cut materials. When cutting materials, you must use the middle and lower parts of the tool, grab the steel bar and accelerate.

4, shall not be shear diameter strength exceeds the provisions of the mechanical nameplate reinforcement and red-hot reinforcement. When cutting multiple steel bars at a time, the total cross-sectional area should be within the specified range.

5. When shearing low-alloy steel, the high-hardness tool should be replaced, and the diameter should be consistent with the nameplate.

6. When cutting the repair material, the distance between the hand and the cutter should be kept above150 mm.. If the hand-held end is less than 400mm, the steel bar end should be pressed or clamped with sleeves and clamps.

7. During the operation, it is forbidden to remove the broken ends and racks near the tool by hand. Non-operators shall not approach the swing range of steel bars and cutting machines.

8, found abnormal mechanical operation sound or tool skew, etc. , should immediately stop, power outage maintenance.

9. After the operation is completed, remove the sundries between knives with steel bars, clean up the construction site, and clean and maintain the whole machine. Turn off the power and lock the box.

Question 6: Problems needing attention in the process of steel bar processing and installation 1. Stirrup joints shall be staggered and bound with two vertical bars, and stirrup joints of cantilever beams shall be below. Other methods are the same as columns. The external angles of beam main reinforcement and stirrup should be all bound, and the rest can be bound at plum blossom point.

2. The steel mesh binding of slab is the same as that of foundation, and the intersection of two-way slab reinforcement should be fully bound. Attention should be paid to the negative reinforcement (surface reinforcement) on the upper part of the plate to prevent it from being stepped on; Especially for overhanging slabs such as awnings, overhangs and balconies, the position and height of negative reinforcement should be strictly controlled.

3. At the intersection of plate, secondary beam and main beam, the steel bar of plate is above, the steel bar of secondary beam is in the middle, and the steel bar of main beam is below. When there is a ring beam or cushion beam, the main beam reinforcement is on it.

4. The bending starting point of floor reinforcement, if there is no bending in the processing plant (field) and there is no special indication in the design drawings, can bend the reinforcement according to the following provisions, and the side span support of the plate is according to the span110l. The mid-span and continuous multi-span of the plate can be supported by the center line 1/6L as the bending starting point. (L- the middle span of the plate).

5, frame beam joints reinforced with very dense, should pay attention to the net spacing between the main reinforcement beam top should be 30mm, and facilitate the need of pouring concrete.

6. The binding joint of steel bars shall meet the following requirements: (1) The distance between the end of the lap length and the bend of steel bars shall not be less than 10 times the diameter of steel bars, and the joint shall not be located at the maximum bending moment of members. (2) In the tension zone, the end of the class I steel binding joint should be hooked, but the class II steel bar should not be hooked. (3) The lap joint of reinforcement shall be fastened with iron wire at the center and both ends. (4) The lap length of the binding joint of tensile reinforcement shall meet the structural design requirements. (5) The thickness of reinforced concrete protective layer should meet the structural design requirements. (6) Before the plate reinforcement is bound, the plate spacing shall be elastic according to the design requirements, and the plate reinforcement shall be bound according to the line to control the quality. (7) In order to ensure the correct position of reinforcement, according to the design requirements, the plate reinforcement is supported by @ 600 reinforced horse stool.

Question 7: What does steel bar processing include (1) Before steel bar processing, rust, oil stains and other sundries on steel bars should be removed first.

(2) Steel bar processing shall be carried out in strict accordance with the bill of materials, which shall indicate the type, shape, size, use position and quantity of steel bars to be processed according to the design and specification requirements.

(3) The ingredients should be reasonably mixed according to the use position, joint form and joint proportion of the steel bar. During processing, the principle of "long use in excellent talent, short use of short materials, matching of length and length" shall be followed, and the whole steel bar shall not be cut off at will.

(4) When bending steel bars, use mechanical cold bending instead of gas welding.

(5) Grade I disc reinforcement shall be straightened and derusted before processing, and the cold drawing rate shall be strictly controlled during straightening.

(6) The end of the first-class reinforcement shall be hooked at 180.

(7) When processing stirrups, it is necessary to ensure that the length of the curved part is 135, the length of the straight part is 10d, and the legs of stirrups are parallel to each other.

(8) Positioning ladder, positioning fixture, horse stool, etc. The size of steel bars should be processed and checked in advance to ensure the accuracy of the size.

(9) Processed semi-finished steel bars shall be piled up within the designated scope at the site, and listed for identification, indicating the type, size, use position and quantity of steel bars to prevent misuse when using.

Question 8: What are the safety protection inspection regulations for steel processing machinery?

1 The safety protection device and limit shall be complete, sensitive and reliable, and the protective cover and plate shall be installed firmly and shall not be damaged;

2 grounding (zero connection) should comply with the provisions of electricity consumption, and the grounding resistance should not be greater than 4Ω;

3 leakage protector parameters should match, installation should be correct, action should be sensitive and reliable; Electrical protection (short circuit, overload and voltage loss) shall be complete and effective.

Hydraulic system inspection regulations:

1 All hydraulic components shall be firmly fixed without leakage;

2 The hydraulic system should be clean and free of grease;

3. The set pressure of each hydraulic component should meet the requirements of the manual;

All hydraulic components should be calibrated and checked regularly.

Question 9: Operating procedures of steel processing machinery; Mechanical operation procedures of steel bar cutting machine.

A, steel bar must be cut in the middle of the tool, shall not be used in the upper part of the tool. In order to avoid overwork at the tail of the body.

Second, steel bars can only be cut with sharp tools.

Three, when the machine is running, are not allowed to make any repairs and corrections.

Four, when there is something wrong with the machine when working, should immediately stop and check, can resume work after being repaired.

Five, when the machine is running, it is forbidden to do any repair work.

Six, it is forbidden to remove the protective cover when the machine is running to avoid accidents.

Seven, according to the "cross" operation method, that is, "cleaning, lubrication, adjustment, strong anti-corrosion" maintenance equipment, strengthen the inspection before and after work.

Mechanical operation procedures of steel bar bending machine

A, bending steel bar, must according to the curvature to control the switch.

Second, the position of the bending point must be determined correctly. Keep the steel bar straight and don't tilt.

Third, the working position should be easy to operate.

Four, bending several long steel bars at the same time, should make good shelf support.

Five, in order to reduce the measurement time, you can set a scale on the table.

Six, at different speeds, the maximum bending times should comply with the regulations.

Seven, according to the "cross" operation method, that is, "clean, lubricate, adjust, firm, anti-corrosion" maintenance equipment, strengthen the inspection before and after work.

Mechanical operation procedures of butt welding machine

A, before operation, should check whether the welding machine handle, pressing mechanism, fixture is flexible and reliable.

Second, water must be supplied to cool the electrode and secondary winding before electrifying, and at the same time, check whether there is water leakage.

Three, before welding, should according to the welding steel section, adjust the voltage twice. It is forbidden to butt weld steel bars exceeding the specified diameter.

Four, all moving parts of the welding machine should be oiled regularly to maintain good lubrication.

Five, contactors and relays should be kept clean, and electrode contacts should be regularly polished with fine sandpaper.

Six, after welding, it is necessary to remove the spatter around the jaw at any time to keep the welding machine clean.

Seven, when working below 0℃, the welder should use compressed air to blow the water in the cooling pipe after use, in order to prevent the water pipe from freezing or blocking.