八年级上英语月考单词
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A, scheme design, and using rangeThe location according to the site condition and bracket, the steel bar diameter as the phi 25; Planting bar adopt the method of impact drill hole. Structural adhesive.Second, the construction processPay-off chisel to material preparation, concrete surface to machine into a hole, hole cleaning - structural adhesive preparation - note glue - cure - testThree, the construction methodPlanting-bar anchorage construction is on has cut hair by the requirement of concrete with diamond drill, electric hammer, such as machinery and equipment, according to the selected parameters into a hole, and the wall of hole processing, injection of structural adhesive was prepared, then implant prepared steel, to achieve the requirement of the steel after solidification.1. The material preparationAccording to design requirements and anchoring parameters for diameter phi 25 ㎜reinforcement, blanking length, should be paid attention to steel surface derusting, then rinse out to dry. With the mechanical construction equipment (diamond drill, electric hammer, air blower, etc.) check the trouble-free, preparing mixed colloid measuring vessel, container, etc.2. The cut surfaceAccording to the design requirements of the position, width and height, to cut surface concrete column side, chisel in addition to the reinforced layer, and the cut surface to brush with steel wire net, high pressure water washed clean; In favor of the old and new concrete can reliable links, to ensure the integrity of the old and the new structure and good earthquake resistance.(3) into a holePlace of the need to anchor reinforcement line positioning, and machinery into a hole to hole is a; Drilling depth of 15 d. Drill, drill and take concrete and high-pressure blower will hole dust out of hole.4. The black holeOf pore forming high pressure processing, wind blowing hole ash net, baked in to dry, then wash hole wall with acetone.5. Note rubber planting barThe preparation of the adhesive reinforcement and mixture ratio, in strict accordance with the deployment of the container can not have oil. When allocating to ensure uniform mixing, color is consistent, glue into the hole after insert treated steel hole, in a certain direction repeatedly, adhesives are to make with steel and concrete bonding surface is close-grained, and temporary fixed, the 24 h at room temperature can force to use.6. CuringStructural adhesive cured after 7 d, drawing experiment (non-destructive testing), and the experiment value to meet the design requirements after unloading. Injecting 48 h rear can construction of next working procedure, within 48 h shall not have any disturbance on steel.7. The moldingPlanting bar after completion, meets the requirements for other processes - for sanding reinforcement assembling, welding, and concrete casting; In concrete pouring construction in strict accordance with the casting way.Four key points and matters needing attention, the construction operation1. Planting-bar anchorage is the key to the hole. Hole cleaning is not clean, or hole wet will be harmful to glue and concrete bonding, make its cannot reach the bond strength of design, affect the anchorage quality.2. Determine reasonable anchorage parameters, such as the hole diameter and depth.3. Colloid measurement must be accurate when making up, otherwise the colloid coagulation time is not good control, and even cause colloid coagulation contraction after curing, bond strength; A colloid mixture should be immediately after putting it in a hole.4. Note amount to grasp accurately, can neither too much nor too little. Too much, when inserted into the steel leakage. Cause waste or pollution; Too little colloid is not full, cause bond strength is not enough.5. Insert the reinforced when must pay attention to a direction of rotation, and rotation while inserted, so that the colloid and reinforced binding.6. Deal with colloid before construction bond strength and bond strength of rubber and steel and rubber and concrete test, meet the design specification requirements and rear can construction.7. After the completion of the engineering project, the sample drawing experiment was carried out, pulling force test for each steel bar intensity design value of 80%. Specific test results as shown in the attachment.8. Before drilling, should be reinforced location of original structure, so as to avoid the damage to the drilling of the original structure of reinforced.Five, the quality requirementsRubber bar and must have the inspection report, must have its corresponding technical parameters, determine the hole diameter, hole depth and length of steel exposed must meet the design requirements, reinforcement spacing should comply with the design and the corresponding acceptance criteria.Six, safety requirementsOperation should be strictly according to the nuclear safety technical regulations and safety regulations must wear insulated shoes, when holding a percussion drill wear insulating gloves; Air drilling, erection of scaffolding, and reset operation platform, to do a good job of safety protection.。