The insulation system of the hot plate once poured and formed around the system, the construction process and quality control measures during the construction process are proposed.
The cast-in-place concrete external wall and the non-net flame-retardant polystyrene outer insulation board integral pouring system are effective measures for energy saving of high-rise residential shear walls in China, overcoming the problem of local thermal insulation local cold bridge, enhancing the heat preservation effect and increasing The use area is convenient for interior decoration and effectively protects the concrete wall. Compared with the net system, the surface layer wire mesh and the obliquely inserted wire are eliminated, and the plate price is reduced by about 1/3 while the 20mm~50mm thick plaster is changed. The anti-cracking mortar of about 5mm improves the work efficiency, shouts light weight of the building, further improves the thermal performance, and the polystyrene board can play the role of external thermal insulation during winter construction. The polystyrene board is mainly suitable for the shear wall with the outer facing paint. structure.
1 After the reinforcement of the outer wall of the construction process is completed, the polystyrene board is installed on the outer side of the wall reinforcement, and then the steel large formwork inside and outside the wall is installed. After the concrete is poured, the insulation layer and the wall are organically combined, after the mold is removed. Apply polymer cement mortar to the surface of the insulation board and press the alkali-resistant glass fiber mesh cloth to strengthen the protective surface layer. The bonding force between the net-free benzene board and the wall is the natural bonding force between the benzene board and the wall (should be greater than the tensile strength of the benzene board itself); the back surface of the benzene board is designed to be zigzag to increase the adhesion and anchoring force with the concrete. At the same time, the periphery of the plate is designed to be high and low, and the joints are bonded to each other to strengthen the integrity of the plate. When the insulation board is installed, the diameter of the insulation plate is 10mm, the length is 110mm, and the jacket is ABS at a certain interval (3/m2). The engineering plastic, the expansion tube with galvanized screws in the middle, protrudes into the concrete 65mm, and the anchoring force of the concrete and the insulation board is strengthened.
2 Operation points 21 Polystyrene board installation (1 amine design wall thickness firstly pop out horizontal and vertical lines to ensure the thickness of the wall is accurate. After tying the wall reinforcement, install 100mm100mm mortar spacer on the outside of the wall reinforcement to make the wall and benzene The plates are tightly contacted to ensure uniform thickness of the protective layer of the steel.) The wire is fixed from one side and then fixed to the wall. The polystyrene board is bonded to the board through the polystyrene at the joint.
(3) According to the design size of the assembled benzene board, the position of the anchor bolt is marked, the spacing is 600mm, the cloth point is plum-like, the electric baking iron is perforated, and then the expansion tube is inserted into the hole, the tail and the wall The steel bars are tied, and there are not less than 5 expansion tubes on each benzene plate.
(4) Fill the gap between the door and window with a 100mmx10mm polystyrene board to prevent the lining of the lining and the wall after the wall is fixed, and then fix the wall concrete by clamping the large formwork.
When the template is installed on the outer side of the outer wall of the outer wall, reliable positioning measures shall be taken at the outer root of the thermal insulation board to prevent the template from pressing against the thermal insulation board. The outer wall outer mold should be larger than the layer height by 30mm~50mm. . The pegs for temporary connection are to comply with the specifications.
(3 Construction machinery control. The requirements for the tools in the construction must comply with the construction specifications. The torque wrench should be checked twice before and after the operation every day. If necessary, the number of verifications should be increased according to the usage. The dry top should be numbered. Establish a card to record the situation. It must be checked before use and can be used after pressure test.
32 material management measures (1 bolt inspection. After bolts are sent to the construction site, the bolts should be sampled and tested. If the bolts are stained with oil, apply kerosene and wash the oil, then apply a little butter on the screw, nut and washer contact surface. The box is ready for use.
(2 examination of liver pieces. Check or test the relevant technical documents and physical objects provided by the factory according to the design documents and the standards for railway steel bridge manufacturing rules. Items include: inspection of steel beam test record; review of major repair records of welds The review of the allowable error of the main bar shape and the visual inspection of the bar. If the site is not in conformity with the repair, the site cannot be rectified and returned to the factory for disposal.
33 Personnel management measures (1 Shield first to pre-job training for construction personnel, professionals require certification to work.
(2) Signing a labor responsibility letter, and assigning responsibility to each position, so that every link in the construction must be strictly controlled.
(3) Reduce the construction quality supervision organization to ensure the normal operation of the management system.
4 Application examples From 2002 to 2003, good results were achieved by using the truss method in the steel beam structure of the Jiaoxin-Xinjiang Railway across the Taixue Highway Bridge and the Beijing-Shanghai Expressway Bridge.
(Responsible editor Hu Jianping) First: Wang Zhifeng, male, born in August 1970, Jinzhong City, Shanxi Province, graduated from Taiyuan Heavy Machinery Institute in 1994, engineer, China Railway Third Bureau, five company machinery factory, Shanxi Province No. 22 Building, 5th Family Office, Xiaqiao Street, Zhongshi City, 30600. Wei Wangyu concrete exterior wall and non-net outer insulation board construction technology should not be placed on the bottom of the wall reinforcement bar using the upper part of the template.
2.3 Watering concrete In order to protect the upper tongue of the polystyrene board, it should be protected at the joint when pouring concrete. The shape is inverted 2.4. When demolishing the mold, first remove the outer template of the outer wall, then remove the inner mold, and avoid crowding. After crushing the benzene board, after disassembling the mold, the polystyrene insulation mortar is used to block the hole of the through-wall bolt and penetrate into the wall more than 50mm, and the defective polystyrene board surface is repaired with the thermal insulation mortar.
2.5 wipe polymer cement mortar (1 clean the surface layer of the insulation board before the end of the ash, level with polystyrene insulation mortar, evenly spread the mixed polymer mortar on the surface of the insulation board (the ratio of anti-cracking polymer cement mortar is: cement) Weight: Anti-cracking slurry weight: sand weight <1:0.5:3).
(2) The glass fiber mesh cloth is cut off according to the height of the layer, the height of the window sill and the height of the lintel. Before the first layer of crack-resistant polymer mortar is not dried, the glass fiber mesh cloth is laid vertically and pressed with a wooden trowel. Into, the surface layer is required to be pulverized. After the first layer of polymer mortar is solidified, a layer of anti-cracking polymer mortar is applied to the surface, and the grid cloth is covered by the slurry to the total thickness of 4 mm. Within the range of =6mm (see) (3) Wipe the 20mm thick polystyrene insulation slurry on the side of the window. Leave a gap of 10mm from the window frame when the paste is applied to prepare the glue.
(4) An angled 50mm and 2m high punched galvanized iron corners shall be added at the first corner of the corner. After the first crack-resistant mortar is wiped, the metal corners are pressed into the mortar (extruded) The slurry is suitable, and then pressed into the fiberglass mesh together with the large face; the metal corners are completely wrapped.
(5) Anti-fracture polymer mortar surface is sprayed with exterior decorative coating.
3 Construction quality control 3.1 Materials (1) The specification, size and shape of the polystyrene board shall be in conformity with the design. There shall be no damage to the design. The entry shall have the factory certificate and test report, and the apparent density shall be 18kg/m3=20kg/m3. Flame retardant polystyrene board.
(2) Polymer cement mortar and glass fiber mesh cloth should meet the technical specifications for external wall thermal insulation construction (polystyrene board fiberglass mesh polymer mortar practice) DB/T01-38-2002, check the certificate and The test was reported and on-site inspection.
(3) Plastic expansion tube:! 10 galvanized bolts, 65mm into the concrete wall, the jacket is ABS engineering plastic.
-94 has a tensile bond strength of 0.17 MPa (time interval > 10 min).
3.2 Verticality and flatness of the wall (1) When pouring concrete, the pressure on the lower side is large, which will tilt the formwork outward, the pressure on the upper side is small, the formwork is inclined in the middle, and the lower part is fastened during construction, and the upper part is supported. Make the seams of the layers less to a minimum, and ensure the verticality and flatness of the wall.
(2) When pouring concrete, pour a piece of iron on the road to pour concrete onto the iron plate, let the concrete flow into the mold, so that the side pressure of the concrete on the template is reduced to ensure the quality.
(3) Due to the large pressure on the corner side, the angle die can be processed into an integral gusset of 600 mm on each side, and corresponding measures are taken on the fixing to ensure that the deviation of the verticality of the corner is less than the allowable deviation.
3.3 Insulation layer (1) The outer wall template does not need to be coated with a release agent to avoid affecting the quality and appearance of polystyrene board plastering.
(2) When the expansion bolt and the wall steel bar are tied, a certain amount of looseness should be reserved to avoid the unevenness of the surface layer of the thermal insulation board after the binding and tightening.
(3) During the process of building a concrete wall, it is forbidden to insert the vibrating rod into the insulation board.
(4) Before placing the expansion bolt, first use the electric baking iron to pierce the hole. It is strictly forbidden to directly insert the expansion bolt into the polystyrene board.
3.4 cracking polymer mortar layer (1) in strict accordance cracking polymer mortar mix ratio f sleep, slump control 120O10mm appropriate, with the mortar to mix with the use, for use in the f the sleep marinated 1.5P daphne.
(2) The sand should be medium sand, and the gravel with a diameter of > 2.5mm should not be mixed to avoid the unevenness of the glass fiber mesh.
(3) when the mesh cloth to wipe laid overlapping each other, lap length not less than 50mm, the yin and yang corner portion to be wrapped and competition, not less than 200mm, non-lapped yin and yang corner.
(4) The layers between the plasters and the plaster layer and the base layer must be firmly bonded, without delamination and hollowing, and the surface layer has no defects such as ash and cracks. Plastering requires a smooth surface, smooth joints, and straight lines.
(5) Door and window corner claim corner material to meet the requirements, the plaster should be smooth ride, door frames and wall clearance packing tight smooth surface.
(6) dividing joint competing, depth uniform, homogeneous, smooth, smooth vertical and horizontal, smooth. The drip line is straight, the drip depth and the competition depth are uniform and not less than 10mm. 4 Conclusion The cast-in-place concrete exterior wall and the non-web polystyrene outer insulation board are integrally casted. The main form of energy saving for high-rise residential buildings is good. , civilized construction, less wet work, low labor intensity, high safety, comprehensive economic benefits and good social benefits, has been moving towards a comprehensive promotion stage is the development direction of building energy conservation in the future. (Editor Hu Jianping) first tied Wang Wei male, born in July 1969, Lan county Shanxi Province, Taiyuan University of Technology who is now in structural engineering in 2003 postgraduate students, engineers, engineering consulting firms Shanxi Province, Taiyuan, Shanxi Fuxi No. 1 Box 268, 30001.
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