Made a more detailed discussion.
The residence of a residential area is a residential building constructed by the fifth branch of Henan Sijian Co., Ltd. and is located in Gongyi District. The building is a frame-scissored structure with a total construction area of ​​31150, 17 floors above ground, and 1 underground floor. 50mm thick polystyrene board external wall insulation 0 1 is a weak link of the thermal bridge problem is not easy to solve; Second, the impact of the construction progress (installation of radiators, water, interior decoration are required to be completed after the installation of internal insulation); Occupied indoor effective area, each household accounts for about 1.3 ~ 1.5mS. Four is to achieve the external wall heat transfer coefficient requirements, the same thermal conductivity coefficient of material insulation thickness is greater than the outer insulation; Fifth, affect the second decoration; six is ​​in the wall Difficulties in hanging objects; Seventh, external walls are greatly affected by outside air temperature, and the temperature difference caused by walls can easily cause cracks in the internal insulation wall surface.
In view of the defects in internal insulation, the design of high-rise residential buildings in a certain district adopts external insulation (steel wire mesh polystyrene board, also known as Shule Shelf). There are two ways to install the Shule Shelf for exterior wall insulation. The first is to complete the construction of the main structure, use the connecting material to fix the Scholes board on the outer wall; the second is to place the Scholes board on the inner side of the outer mold where the wall is to be poured, and after the concrete of the wall is poured, the outer insulation board And the wall once survived, this process can save a lot of manpower, time and installation of machinery and spare parts. The latter kind of installation method was selected for the external insulation of a high-rise residential building in a residential area.
Reinforced steel banding (rebar must have a factory certificate and retest report); 2 The location of the wall bars must be accurate and must be performed strictly in accordance with the operating procedures; 3 External wall thermal insulation plate installation (the interior and exterior walls of reinforced steel banding experience after qualified, before the insulation board Installation); 4 Pop up the horizontal and vertical lines according to the wall thickness required by the design to determine the outer thickness dimension. At the same time in the outer wall reinforcement tie card pad, not less than 6 pieces in each plate; 5 cutting assembled insulation board. After the insulation board is in place, the L-bars pass through the insulation board at the position of the baffle wall and are burnt with fire. Fasten its steel wire mesh and wall reinforcement. The L-barrel has a diameter of 6mm, a length of 150mm, and a hook of 30mm. It passes through the heat-insulating part and brushes the anticorrosive paint twice. The low-carbon steel wire mesh on the outer side of the warm plate is disconnected and disconnected by the floor layer and is not connected to each other. Corners and windows, outside the bottom of the balcony to be attached to the angle of the net and connect flat net, lap length of not less than 200mm. Before the installation of the template must be part of the concrete picking clean, it is appropriate to use a large template, according to the thickness of the insulation board to determine the template preparation Size, quantity. 1 Pop up the wall line installation template. When the concrete strength of the bottom layer is not less than 7.5 MPa, the installation begins; 2 Install the outer wall of the outer template. Before installation, reliable positioning measures shall be taken at the root of the cast-in-situ concrete wall or on the outside of the insulation board to prevent the template from squeezing against the insulation board. The stencil is placed on a triangular pedestal, the stencil is in place, and the bolts are tightened and tightened. The connection must be tight and firm so as to prevent erroneous stages and slurry leakage.
External wall insulation uses commodity concrete. 1 Before the wall concrete is poured, the top surface of the thermal insulation board must be sheltered. New and old concrete joints should be poured with 3 to 5 cm fine-strength concrete of the same strength class. Concrete layered pouring, the thickness of each layer is controlled at 500mm, "sub-casting should not exceed lm, the concrete hopper should be distributed, continuous, interval time does not exceed 2h; vibrating rod vibration spacing should not be less than 50cm, each vibration point The surface of the continuation time exhibits laitance and no longer sinks. When concrete is poured at the entrance of the hole, the material shall be cut along both sides of the opening at the same time so that the pouring pots on both sides are approximately the same, and the vibrating rod should be more than 30 cm away from the hole; In the span of the lintel of the door opening, it can also be left at the junction of the vertical and horizontal walls. After the concrete of the 5 wall is poured, the reinforcement must be finished and the surface of the concrete should be wiped with a wooden spatula.
1 Under normal temperature conditions, the panel can only be removed when the concrete strength of the wall is not less than 7.5 MPa. When demoulding the template, the compressive strength of the same condition concrete curing specimen should be taken as the criterion. 2 The outer template of the wall should be removed first. Then remove the inside template of the wall. , And timely repair wall corner coagulation; 3 After the removal of the wall casing, dry mortar holes should be filled, after filling, the outer hole should be lack of insulation board to make up with insulation materials.
During normal temperature construction, spray water curing within 12 hours after the template is dismantled, not less than 7 days and nights, and the number of spray water curing shall be based on keeping the concrete wet. In winter construction, the concrete curing temperature shall be determined at regular intervals, and the records shall be recorded and demolished. After the concrete surface should be covered so that it slowly cools.
The concrete of the wall shall be vibrated densely and densely. The wall surface and the joints shall be smooth and flat. The wall shall be free from defects such as holes, exposed bars and ash.
1 Preparation before plastering. The slurry that is poured on the surface of the insulation board is not well combined with the trowel, and those who have loose or empty phenomena should be cleaned to ensure that there is no dust, oil collapse and dirt; 2 The yin and yang angles and the joint seam network must be spliced ​​with steel wire and insulation board steel wire Firm, straight angle. Between two layers of insulation board steel wire should be disconnected, not connected; 3 raw materials. Cement is '425 ordinary portland cement; sand is medium coarse sand. The cement mortar was prepared according to the ratio of 1:3 and was mixed with 1% of cement weight cracking agent; 4 ash. The EC-1 interface treatment agent on the surface of the board must be uniform. After it is dry, it can be plastered. Between the plastering layer and between the plastering layer and the insulation board must be firmly bonded, there is no delamination, empty drum phenomenon, the surface should be smooth and clean, the next step should be smooth, the line angle should be vertical and clear. Plastering should be divided into bottom layer and surface layer, to be layered plaster, until the bottom ash condensation before the surface layer plastering, each layer of plaster thickness of not more than 10mm, the total thickness of not more than 20mm' to cover the wire is appropriate, each After the layers are wiped off, they need to be sprinkled and cured; 5 The binding strength test and anti-pulling test of the mud mortar and the steel wire mesh piece are then performed.
The above external insulation construction is a better external insulation practice. No special machinery and technical workers are needed in the construction. The construction progress is fast, and basically does not affect the construction progress of the structure. Moreover, the insulation material does not absorb water and water, which is beneficial to external walls. Maintenance, winter construction is conducive to the insulation of concrete. Through the application of this project, the construction period and project quality are ensured. However, there is still no complete set of standard practices in practice and it needs further exploration and improvement.
Picnic backpack is a type of backpack designed specifically for carrying everything you need for a picnic. It typically includes compartments and pockets for storing food, drinks, utensils, plates, and other picnic essentials.
A typical picnic backpack may include the following:
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Insulated compartment: This compartment is designed to keep your food and drinks cool for hours. It is usually lined with thermal material to maintain the temperature of the food.
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Utensil compartment: This compartment is designed to hold utensils such as knives, forks, spoons, and bottle openers.
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Plate and glass holders: These are usually attached to the sides of the backpack and are designed to hold plates, glasses, and cups.
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Napkin holder: This is a small pocket or strap designed to hold napkins.
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Blanket: Some picnic backpacks also come with a built-in blanket that can be rolled up and stored in a compartment.
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Other accessories: Some picnic backpacks may also include salt and pepper shakers, cutting boards, cheese knives, and other picnic accessories.
Picnic backpacks come in different sizes, styles, and designs. They can be made of different materials such as canvas, polyester, or nylon. Some backpacks may also be waterproof or water-resistant to protect your food and drinks from getting wet in case of rain.
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