Question 2: What is the definition and scope of design overlap and construction overlap? Is the construction atlas a design lap joint? When you say that lap joint is an extension of steel bars, you need to comply with the Code for Seismic Design of Buildings (GB 50011_ 2001), Code for Design of Concrete Structures (GB 500 10_2002) and Code for Acceptance of Construction Quality of Concrete Structures.
In the actual construction process, when the reinforcement of the component is not long enough (the ex-factory length of the reinforcement is), it is necessary to connect the reinforcement. There are three main ways to connect steel bars: binding connection (lap joint), mechanical connection and welding (partial lap joint). In order to ensure the reliability of steel bars, the scope of steel bar connection joints and the processing quality of joints are specified in the steel bar plan as follows:
1, when the diameter of tensile reinforcement is > > 25mm, and the diameter of compressive reinforcement is > > 28mm, binding lap joint should not be adopted.
2, when the axial tension and small eccentric tensile members of the longitudinal reinforcement should not be used binding lap.
3, longitudinal reinforced connection position should avoid the beam end, column end stirrup encryption area. If secondary connection is needed, mechanical connection or welding shall be adopted.
Its lap length is also clearly defined:
Therefore, it can be regarded as design lap joint in design regulations, general design instructions, reinforcement plan drawings and technical documents, while lap joint in actual construction, construction organization design, engineering technical data and construction quality acceptance can be regarded as construction lap joint. Of course, the construction lap joint requirements are higher than the design lap joint requirements.
Question 3: What do the overlapping construction steps of steel bars mean in actual construction?
Question 4: What is the lap speed of flow construction? The difference between the total time of the upper and lower processes and the net time of each process.
Question 5: Which is commonly used in actual construction, flow construction or overlapping construction? You need both.
1, flow construction is an inevitable choice after reasonable division of construction sections. For example, three similar buildings, the main structure is naturally divided into three sections, running water construction. As long as there is only one steel bar and formwork team, there is no slowdown in circular construction.
2. However, the previous process and the next process should basically overlap. The external formwork of each layer of beam formwork has not been finished, and the steel bars have been tied. This is normal.
I can't emphasize that it is more commonly used.
Question 6: 5 points for rebar lap joint. It is not allowed to add a steel bar to connect two steel bars that have been discharged but the binding length is not enough for binding treatment.
The reason is simple: one connector or two connectors? How to calculate the binding lap length of reinforcement? How to find the ζI value of the area percentage (%) of longitudinal reinforced lap joint? In short, there is no relevant standard basis for such a joint method! There are no related experimental reports. Therefore, it is not allowed to add a steel bar to connect two steel bars that have been discharged but the binding length is not enough for binding treatment.
Question 7: What's the difference between anchoring and overlapping? Anchoring is like a ship's anchor plunging into the sand, being thrown down and being fixed. In architecture, it is the grip of cement on steel bars, mainly to increase the longitudinal shear stress of steel bars.
Lap, refers to the connection between reinforcement together, there are straight stubble lap and staggered stubble lap.
Construction technology (2004. 12), pp. 64 and 65, "Research on steel bar structure in high-rise frame-shear structure", an article in Jinan. The second question, "Form of longitudinal steel bar binding lap joint", says that "the new specification stipulates that the transverse clear distance of steel bar in longitudinal steel bar binding lap joint should not be less than the diameter of steel bar and should not be less than 25mm. However, the construction is still carried out in the form of traditional steel binding and overlapping. I wonder which is this new specification? However, I think it makes sense. What I want to know now is whether the parallel rebar lap ties 2 to the rebar; The so-called new code requires scattered overlapping, and longitudinal bars and stirrups are tied tightly, but overlapping longitudinal bars do not have to be tied together. According to the stress analysis mentioned in this paper, I think it is reasonable that the longitudinal steel bars are not tied together, as long as the lap length meets the requirements of the code, and it is not necessary to tie them together. It's best not to tie them together. The reason is that the concrete around the steel bar increases, and its bite force increases.
Question 8: What are the requirements for steel bar lapping in construction projects? I don't know if you study engineering, but if you graduate from engineering, your teacher will vomit blood and die. Tell you, the state has rules and regulations on steel bar lap joint. Look at the 04G 10 1 atlas from a straight point of view, just download one online. I suggest you train.
Question 9: When calculating the number of steel bars, the overlapping length of steel bars should be calculated according to the design and specifications. The construction loss and lap joint not specified in the design and specification have been included in the safety net loss of steel bars and are not calculated mutually. This clause should be understood as: "When calculating the number of steel bars, the overlapping length of steel bars should be calculated according to the design and specifications." I have already talked about the basic calculation method of the number of steel bars. "The construction loss and lap joint not specified in the design and specification have been included in the safety sub-network loss of steel bars, and will not be calculated separately". The number of steel bars other than those specified in the previous sentence, such as steel bars for fixing mesh, small steel bars for fixing beam stability and steel bars left on the ground for supporting formwork, does not refer to the steel bars of structural members.
1-this is the content in the quota. According to this meaning, it is not necessary to calculate the overlapping reinforcement of the capping beam. If the rebar is long enough, there is no need to lap it.
2-If the lap joint is to be calculated, the lap joint is several meters long. Are there any specifications? Generally speaking, the amount of overlap is calculated according to the entry length of steel bars. If it is adjusted to 9 meters, it is a 9-meter joint; If you dial in12m, then count the connector as12m. Of course, we usually try to get joints with short raw materials.
3- Whether the horizontal reinforcement of the new retaining wall and the horizontal reinforcement of the main structure do not need to be anchored with hooks when anchoring. This question is wrong. Both horizontal and vertical steel bars are divided into two parts: overlapping and anchoring. If the rebar is not long enough, it must be overlapped. Where there is a corner, it must be anchored. When the straight anchor is not long enough, it must be bent.
Do you understand?
Question 10: What are the lap joint modes and lap joint width requirements of waterproofing membrane during construction? Self-adhesive waterproofing membrane, overlapping of adjacent membranes: uncover and fold the upper isolation membrane of the paved membrane according to the requirements of overlapping width, and then lay another membrane. Coil lap width, tire-free self-adhesive coil long side not less than 60mm, short side not less than 80mm；; The long and short sides of self-adhesive coiled material with tire shall not be less than100 mm. Please consult Xi Anhanxin for related questions.