oneAccording to the standard:
Quality Acceptance Standard for Building Decoration and Decoration Engineering" GB50210-2018
Unified Standard for Acceptance of Construction Quality of Construction Projects GB50300-2013
Technical Code for Safety of Work at Height in Building Construction" JGJ80-2016
Design Standard for Energy Efficiency in Public Buildings GB50189-2015
Construction drawings of Dashang Huafu.
IIExterior wall insulation practices
The exterior wall of the residential building of this project is made of 80-thick A2 composite phenolic fireproof insulation boardPartial balcony railings are 50Thick A2 grade composite phenolic fireproof insulation boardThermal bridges, cold bridges, awning panels, horizontal directions of external windows, parapets, smoke hoods and other shapesAdoption30 thick A-grade inorganic insulation mortar. The car ramp exits the outdoor ground retaining wallAdoptionM10 ready-mixed cement mortar plastering. EPS composite components are pasted with professional adhesive mortar. The main performance index of composite phenolic fireproof insulation board is: thermal conductivity 0031w／（m.k), dry density 25kg m3, compressive strength 012MPa, the combustion performance grade should not be lower than A2. The main performance index of inorganic thermal insulation mortar is: thermal conductivity 0070w／（m.k), dry density 350kg m3, compressive strength 020MPa, the combustion performance grade should not be lower than Class A.
Three, exterior wall composite phenolic fireproof insulation board construction technologyprocessand the main practice requirements
3.1. Process flow:
Grassroots cleaning elastic line lofting Arrangement of boards (brush interface agent) Adhesive Paste lines and pre-glued board edge wrapping mesh cloth Paste composite phenolic insulation board Drilling and installation fixtures Phenolic board grinding, jointing, leveling, cleaning Intermediate acceptance Wipe anti-crack mortar Acceptance
3.2. Detailed explanation of construction steps:
1.Grassroots Cleanup:
Thermal insulation base inspection, acceptance: whether the external wall insulation base meets the requirements, is directly related to the quality of thermal insulation construction is one of the main reasons, insulation construction must be jointly accepted by the owner, supervision, general contractor, external thermal insulation construction unit (can be subdivided acceptance), acceptance can be carried out only after acceptance. Check the contents:
The surface of the external wall insulation base should be smooth and firm, clean and dry, in line with the design requirements, and the cement mortar leveling shall not have cracks, crisp looseness, sanding, peeling, and hollowing.
The secondary structure wall is leveled with anti-cracking mortar, and the local mortar is not full with mortar or foam.
It is required that the surface flatness and verticality deviation of the stucco base do not exceed 3mm, and the maximum gap between the outer wall base and the ruler should not be greater than 3mm and should be changed gently. When the deviation is out of tolerance, the protruding wall is polished, and the recess part is repaired (1 25. Cement mortar plastering, when the thickness is less than 6mm, the insulation construction unit shall use a special adhesive mortar to implement the repair);In order to ensure that the flatness of the entire wall is within 3mm, the yin and yang corners are square, and the top and bottom are smooth.
The exterior wall insulation base must be clean, dry and flat;Whether the size of the balcony railing, overhanging eaves and other protruding wall parts meets the design requirements;Door and window frames are in place.
2.Spring-line control:
According to the technical requirements of the building façade design and the external wall insulation system, the horizontal, vertical and expansion joints and decorative seams of the external doors and windows are popped up on the wall, from -0Starting from 200, eject the line of each board according to the specifications of the insulation board.
Hang vertical datum control lines at the yin and yang corners of the exterior wall of the building and other necessary places, and hang horizontal lines at appropriate positions on each floor to control the verticality and flatness of the insulation board paste.
3.Plate arrangement (brush interface agent).
Before the construction of the insulation board, the typesetting drawing should be drawn according to the requirements of the design drawings, the specifications and quantity of the special-shaped board should be determined, and the board should be popped out with an ink line on the base layer.
Block location map. In order to enhance the adhesion between the insulation board and the adhesive paste, a special interface agent is thinly applied on both sides of the phenolic board before pasting the insulation boardAfter the interface agent is dried, the special adhesive mortar can be applied for wall pasting construction.
4.Formulating adhesives.
1) Pour 5 parts (weight ratio) of dry-mix mortar into a clean plastic bucket, add 1 part of clean water, stir while adding water, and then stir with a handheld electric mixer for 5 minutes until the stirring is uniform and the consistency is moderate.
2) Let the configured binder stand for 5 minutes, stir again and then use, the configured binder should be used up within 1 hour.
3) The configuration of special binder is only allowed to add clean water, and other additives (agents) are not allowed.
5. Install phenolic insulation board.
1) The size of the standard board is 1200*600mm, the diagonal error is less than 2mm, the insulation board is cut with a tool knife, and the allowable deviation of the size is 15mm。
2) Mesh cloth flipping: pre-glued mesh cloth on the phenolic insulation board on both sides of the door and window openings, deformation joints, etc., with a total width of about 200mm and a width of 80mm for the package turning part, the specific method is as follows: the cutting length of the mesh cloth is 180mm plus the thickness of the plate. First, apply a special adhesive with a length of 80 mm and a width of 20 mm on the bag turning area, then press into the 80 mm long mesh cloth, and throw out the rest for later use.
3) Apply the configured special adhesive to the back of the phenolic insulation board, the thickness of the adhesive compaction is about 3mm, in order to ensure that the bonding is firm, the bonding method can be adoptedPoint-and-click methodThe total bonding area should not be less than 60%.
Point frame method: use a trowel to wipe a special binder with a width of 50mm and a thickness of 10mm around each phenolic insulation board, and then wipe the ash cake with a diameter of 100mm and a thickness of 10mm in the frame, which is distributed in the shape of plum blossoms, and a 50mm exhaust hole should be left in the frame at the bottom of the insulation board.
5) Quickly paste the phenolic insulation board with a special adhesive on the wall to prevent the surface from crusting and losing the bonding effect. Do not apply a special adhesive to the sides.
6) After the phenolic insulation board is glued to the wall, it should be flattened with a 2-meter ruler to ensure its flatness and firm pasting, and the board should be squeezed tightly between the boards, and there should be no 3mm gap. After each board is glued, the extruded special binder should be removed.
7) The insulation board should be pasted in sections from bottom to top along the horizontal directionEach row of boards should be staggered 1 2 plate lengths, the minimum local staggered seam shall not be less than 100.
6. Make decorative line corners
1) According to the design requirements, use the ink line to eject the position of the line angle that needs to be made, and correct the horizontal and vertical directions.
2) After the line angle should be cut according to the design size, the first corner and the interface agent on both sides of the corresponding insulation board should be brushed together, and then coated with a special adhesive to make it paste firmly.
7. Install the fixings
1) The installation of the fixing parts can be started after the phenolic insulation board is pasted and completed within 24 hours thereafter. According to the position required by the design, drill with a percussion drill, the hole diameter is 10mmThe depth of drilling into the base wall is about 60mmThe depth of the anchoring of the fixtures into the base wall is about 50mm to ensure firm and reliable.
2) The number of fixing parts is one at each of the four corners of the insulation board, 2 are reinforced in the middle, 30 windows and yang angles, and the length of the plastic expansion nail should be greater than the thickness of the plate 5-6. The diameter of the anchor should be consistent with the thickness of the expansion nail. See image below
3) The self-tapping screws should be squeezed tightly and the surface of the engineering plastic expansion nail cap and the phenolic insulation board should be neatly or slightly screwed into some to ensure that the tail of the expansion nail is bulging out and fully anchored with the base wall.
8. Wipe the bottom polymer mortar:
1) The configuration of polymer mortar is the same as that of special binder.
2) Apply the configured polymer mortar evenly on the phenolic insulation board with a thickness of 2mm
9. Press-into the mesh cloth
1) The mesh cloth should be cut according to the length and width requirements of the working surface, and the lap width should be left. The cutting of the mesh cloth should be carried out in the warp and weft directions.
2) Turning the mesh cloth around the openings such as doors and windows, the four corners should be strengthened by an additional layer of mesh cloth, and the whole mesh cloth should be turned around the opening and the additional mesh cloth.
3) Apply polymer mortar on the front and side of the phenolic insulation board at the opening and the mesh cloth turning part (only the end edge of the mesh is allowed to be plastered with polymer mortar). The pre-thrown mesh cloth is flipped along the thickness of the plate and pressed into the polymer mortar.
4) Straighten and flatten the whole mesh cloth in the horizontal direction, pay attention to the inward curved side of the mesh cloth, and use a trowel to smooth the mesh cloth with the middle up and down sides to make it close together. The horizontal lap width of the mesh cloth is not less than 100mm, the vertical lap length is not less than 80mm, and the lap joint is supplemented with polymer mortar to the vacancy of the bottom mortar, and the mesh cloth shall not be wrinkled, hollow and warped.
5) At the corners of the concave and convex lines, the narrow mesh cloth should be buried in the underlying polymer mortar, and the whole mesh should be laid on the narrow mesh cloth with a lap width of 80mm.
6) At the yin and yang corners of the wall, the grid cloth on both sides is overlapped with each other in both directions, and the lap width of each side is not less than 200mm.
10. Plastering polymer mortar:
After wiping the bottom layer of polymer mortar and pressing into the mesh cloth, when the mortar solidifies to the surface is not sticky, start to wipe the surface layer of polymer mortar, and the thickness of the plastering surface is subject to the covering mesh cloth, so that the total thickness of the polymer mortar is 5mm.
Fourth, the construction process and main practice requirements of inorganic thermal insulation mortar (FTC).
4.1. Construction process.
Base treatment: Hanging vertical line, elastic control line, pasting cake, re-measuring the flatness of the base layer, brushing interface mortar, wiping inorganic thermal insulation slurry, thermal insulation layer acceptance, plastering cement anti-crack mortar, then plastering plastic alkali-resistant glass fiber mesh cloth, anti-crack protection layer acceptance.
4.2. Description of construction process.
1.Base treatment: construction of phenolic fireproof insulation board.
2.To make a mark, the construction thickness mark should be done on the wall before the construction of the cake insulation slurry, and the cake should be pasted according to the following steps:
1. For each floor, first check the flatness of the wall with a 2m bar ruler, and check the verticality of the wall with a 2m supporting board.
2 at about 10cm from the top of the floor, at the same time about 10cm from the yin and yang angles of the big wall, according to the thickness of the steel vertical control line that has been hung at the corner of the big wall, paste 5cm 5cm polystyrene plate with interface mortar as a standard sticker.
3. After the standard sticker is fixed, pull the horizontal control line between the two horizontal stickers, and the specific method is to insert the small round nail with a small line into the standard sticker, straighten the small line, make the small line control slightly higher than the standard sticker cake 1mm, and press 1 between the two stickersPaste a number of standard stickers horizontally at 5m intervals.
4. Use the line pendant to hang the vertical line about 10cm from the bottom of the floor, and paste the standard sticker at 10cm at the yin and yang corners of the big wall. (When the floor is higher, it should be completed by two people) after the interval 1Paste the standard sticker in the vertical direction about 5m.
5. After the construction of each layer of pasting cake is completed, check the consistency of the pasting cake with a 2 5m small wire in the horizontal direction. In the vertical direction, the verticality is checked with a 2m supporting board, and the thickness of the ash cake is measured, and the engineering quantity of the ultra-thick area is calculated.
3.Interface mortar construction.
The interface mortar is evenly painted on the concrete or aerated block wall, and the interface mortar layer should not be too thick.
4.Insulation slurry construction.
1. The interface mortar is basically dry, and the construction of the insulation slurry can be carried out.
2. In the preparation of insulation slurry and anti-cracking mortar, the mixing needs to be carried out by a special person to ensure the accuracy of the mixing time and water addition. The mixing quality at the construction site can be judged by observing its operability, slip resistance, paste status and measuring its wet apparent density.
3. The insulation slurry should be completed in layers, and the thickness of each plastering should be controlled at about 15mm, and the thickness of the design insulation layer should be designed by layered plastering, and the construction interval of each layer is 24 hours.
4. The order of plastering at the bottom of the insulation slurry should be from top to bottom, from left to right, and the thickness of the construction plastering can be increased as much as possible on the basis of compaction, and it is appropriate to wipe it to about 1cm away from the insulation standard sticker.
When plastering the surface layer of thermal insulation slurry, it should be repaired mainly for the depression with a thin slurry, for the protrusion, it can be scraped flat with a trowel, and finally the wall is wiped with a trowel, first horizontally and then vertically, and then with a supporting line ruler, and the acceptance standard is reached after the 2m bar ruler is detected.
During the construction of thermal insulation slurry, it is necessary to pay attention to cleaning the ground ash, and the ground ash can be used by re-mixing within 4 hours.
5. The details should be carried out according to the following steps:
1) Check the straight angle of the base wall corner with a wooden square, and check the verticality of the wall corner vertically with a line pendant.
2) The insulation slurry should be pressed by a wooden square to rub the corner slurry layer up and down, so that the corner insulation slurry is basically vertical. Then the yin and yang horn trowel calendered.
3) After the installation and acceptance of the window auxiliary frame, the insulation and plastering construction of the door and window unit can be carried out, and the door and window should be wiped first during the construction of the door and window, and the window sill and the upper window should be wiped with a large wall. Before construction, the size of the door and window should be connected to the unilateral figure-of-eight ruler, and the mouth should be built with a ruler to ensure the consistency of the door and window prescription and the inner and outer dimensions.
4) Drip line (groove): In the cornice, window sill, lintel, awning, balcony, top pressing and protruding wall and other parts, the flow slope should be made above, and the drip line (groove) should be made below. The slope of the flowing water andThe drip line (groove) should not be less than 40mm from the outer surface, the drip line (also known as the olecranon) should ensure that its slope is correct. After the construction of the insulation slurry is completed, the groove is cut along the line with a wallpaper knife on the insulation layer, and the groove depth is about 15mm, the groove is filled with anti-cracking mortar, the drip groove is embedded in the groove and the anti-crack mortar is firmly bonded, and the floating slurry along the mouth on both sides is removed, and the drip groove should be inlaid firmly and horizontally.
5) After the construction of the insulation slurry is completed, a comprehensive quality inspection should be done according to the requirements of the inspection batch. On the basis of passing the self-inspection, the construction quality records shall be sorted out and submitted to the general contractor and related parties for concealed inspection and acceptance.
5.Anti-crack layer construction.
1) After the insulation construction is completed for 3 7 days and the thickness and flatness of the insulation layer are concealed and accepted, the anti-crack layer construction can be carried out.
2) Configure anti-crack mortar:
Pour 5 parts (weight ratio) of dry-mixed mortar into a clean plastic bucket, add 1 part of clean water, stir while adding water, and then stir with a hand-held electric mixer for 5 minutes until the stirring is uniform and the consistency is moderate. Let the anti-cracking mortar stand for 5 minutes, stir it again and then use, and the configured binder should be used up within 1 hour. The configuration of anti-cracking mortar is only allowed to add clean water, and no other additives (agents) are allowed.
3) When wiping anti-cracking mortar, the thickness should be controlled at 3 5mm, and the anti-cracking mortar with width and length equivalent to the mesh area should be pressed into the mortar immediately after wiping the anti-cracking mortar with iron trowel characters. The width of the lap between the mesh should not be less than 50mm, press into one side first, wipe some anti-column mortar and then press into the other side, the lap joint should be filled with mortar, and it is strictly forbidden to dry it. Finally, it is necessary to press the iron plastering word again along the longitudinal length of the mesh cloth to collect the light and eliminate the trowel mark on the surface. The degree of press-in of the mesh cloth should be such that the exposed mesh is visible, but the bare mesh cloth cannot be seen on the surface.
4) The alkali-resistant mesh at the yin corner should be pressed and lapped, with a width of 200mm, and the yang corner should also be wrapped in both directions and the corner should be pressed and lapped, with a width of 200mm.
5) When the corners of the anti-crack surface layer need to be flattened and trimmed, the surface can be brushed with an appropriate amount of water with a bristle brush before calendering, which can effectively prevent the mortar from sticking to the trowel. The window sill mouth should be straight, there should be no burrs, and the sunny corner of the window should be pressed and trimmed straight with a sunny trowel.
6) After the construction of the anti-crack layer is completed, the quality of the project should be comprehensively inspected according to the requirements of the inspection batch. On the basis of passing the self-inspection, the construction quality records shall be sorted out and submitted to the supervision and Party A for concealed inspection and acceptance.
Five、Quality control requirements:
Raw materials are accepted at the site
After the insulation board, insulation mortar, adhesive mortar and plastering mortar enter the site, notify the general contractor, supervision, and construction unit materials department to jointly verify the manufacturer's qualification certificate, business license, thermal insulation record, thermal insulation board parameters and other information, after the data is qualified (thermal insulation mortar, adhesive mortar and plastering mortar data can be sampled and sent for inspection, and a sample can be sealed on site), thermal insulation board and rock wool need to be spot-checked on the dry density, and the dry density is qualified after sampling and inspection (a sample is sealed on site), and the exterior wall construction can only be started after the re-inspection is qualified. Anchor nails and mesh cloth provide samples in advance, and seal the samples after the approval of the three parties, and then the materials will enter the site for acceptance according to the requirements of the sealing samples.
Note: Each batch of insulation materials need to be accepted in accordance with the acceptance requirements of this article, and it is recommended that the exterior wall construction unit calculate the amount of materials in advance according to the building number under construction, and enter the whole batch as much as possible
2.Model construction:
Each team needs to construct the exterior wall insulation model in the designated area before construction, report to the tripartite acceptance, take pictures and seal the sample after acceptance, and each team must carry out large-scale construction in accordance with the model construction standards after acceptance.
3.Construction Acceptance:
Nodes to be accepted: after the construction of the exterior wall model is completed, the acceptance of the wall base layer before construction, and the anti-package net is fixed, before the insulation board is paved and nailed, after nailing, and after the plastering construction is completed.
Participants: quality inspectors, supervision engineers, and civil engineers of the construction unit of the general contractor (among them, the acceptance of the exterior wall model and plastering needs to be attended by the technical person in charge of the general contractor, the chief engineer, and the project manager of the construction unit).
Acceptance Criteria:
Note: The general contractor, the supervision company, and Party A shall carry out acceptance in strict accordance with the acceptance standards. For the unqualified parts of the acceptance, it is forbidden to carry out the next process.
6. Precautions
1) The construction environment must ensure that the temperature is above 5 degrees, and the wind force shall not be greater than level 5.
2) Ensure that the floating ash of the base layer is clean.
3) The bonding area of the fireproof isolation tape is 100%.
4) It is strictly forbidden to have ash between the seams of the insulation material boards.
5) The construction of the plastering layer must be allowed only after the adhesive mortar is completely dried.
6) The bottom mortar must be smeared, and the net is not allowed to be hung dry.
7) Since the composite phenolic insulation board is a high water absorption product, the rock wool material should be protected from rain in the construction project, and the insulation board surface should be plastered in time after the mortar is dried.
8) After the construction gondola enters the site, notify the three parties to verify the data performance of the machinery, and notify the three parties to carry out acceptance after the installation is completed, and it is not allowed to be used if it is not accepted.
9) The construction site shall comply with the general contractor's management requirements for quality, safety, progress, civilized construction and dust.
10) All acceptance shall be completed by the general contractor and then submitted for inspection.
11) After the concealed project is no longer accepted, it is forbidden to carry out the next process.
12) On-site dust control obeys the management of the general contractor and meets the requirements of the first document issuance.
13) The material stacking is subject to the management of the general contractor, and the waste materials left on the site are cleaned up after the construction is completed every day.
14) Comply with the project management measures issued by the construction unit.