70 Broken Bridge Swing Door System | Full Analysis of Profile Structure, Sealing, Hardware, and Performance

[Real scene of 70 broken bridge casement doors, floor renderings of 70 broken bridge casement doors in modern residential balconies and courtyards, single opening, mother and child door styles]

70 broken bridge swing door system, refers to the frame profile base width of 70mm through the strip broken bridge aluminum alloy swing door system, different from ordinary broken bridge sliding doors, 60, 65 small series swing doors, is home decoration balcony door, courtyard door, shop channel door mainstream standardized system products. Many customers are prone to 70 broken bridge swing door is equivalent to ordinary broken bridge door, only look at the appearance color, ignore the system design logic. 70 broken bridge swing door belongs to a complete set of systems, profile cavity, thermal insulation structure, sealing drainage, group angle technology, hardware notch, threshold structure unified matching, not scattered profiles simple splicing, taking into account heat preservation and energy saving, air tightness and water tightness, wind pressure resistance, sound insulation and anti-theft multiple performance, suitable for residential, villa, shop and other scenes. This paper focuses on the profile structure, heat insulation principle, sealing and drainage, hardware configuration, glass selection, performance parameters, installation acceptance, selection and purchase of pit avoidance of 70 broken bridge swing doors.

[Section details | 70 broken bridge casement door profile cross-section marking, marking the total width of 70mm, PA66 heat insulation strip, multi-cavity, drainage cavity, lock point cavity]

First, 70 broken bridge swing door profile substrate and cavity structure

70 broken bridge casement door base material adopts 6063-T5 national standard primary aluminum alloy, the primary aluminum metallographic phase is uniform, the strength is stable, the spraying adhesion is good, and it is not easy to peel and crack; inferior products use recycled heteroaluminum, which has many impurities and is easy to deform and paint off after long-term sun exposure. According to GB/T8478 aluminum alloy doors and windows standard, the wall thickness of the main force frame and fan profile of the casement door is ≥2.0mm. It is recommended to use 2.2mm thickened profiles for large-size mother-child doors and outdoor windward positions to avoid the door leaf's own weight sagging and wind pressure deformation.

The profile adopts a multi-cavity structure, which is divided into a heat insulation cavity, an independent drainage cavity, and a hardware lock-point cavity. The heat insulation cavity has a built-in 24mm wide PA66 glass fiber reinforced nylon heat insulation strip, and the heat insulation strip is laser-coded by the original factory. It is the core of the broken bridge structure. Cut off the hot and cold bridge of the aluminum profile to reduce heat conduction; the drainage cavity is independently isolated, and rainwater and condensate will not flow into the heat insulation cavity and the hardware groove to prevent hardware corrosion; the thickened design of the lock-point cavity makes it not easy to deform when the multi-point lock is stressed.

The surface treatment process is divided into electrostatic powder spraying, fluorocarbon spraying, and wood grain transfer printing. Indoor powder spraying is cost-effective and rich in color; outdoor gardens and coastal high salt spray environments give priority to fluorocarbon spraying, which is resistant to ultraviolet rays and rain corrosion, and has a service life of more than 15 years; the new Chinese style can use wood grain transfer to improve the spatial texture.

The 70 system adopts the European standard C-slot hardware slot, which is highly versatile and suitable for domestic and imported brand system hardware. This is also a major advantage of it as a standardized system door.

[Close-up of angle formation process | 70 broken bridge swing door pin glue injection angle details, comparison of angle code, glue injection channel, and angle leveling effect]

Second, the angle forming process determines the long-term stability of the door frame

The corner connection of the system doors and windows is a weak position. The standard process of the 70-broken bridge swing door is the pin injection group angle, which is different from the ordinary simple corner code nailing. The corner has a special cast aluminum corner code built in, and the corner code reserves a glue injection channel. After the group angle is completed, the group corner glue is injected. After the glue is cured, the four corners of the frame fan form a rigid whole, and the corner seam is tight, which is not prone to problems such as corner cracking, water seepage, and large gaps.

If you don't do the glue injection process, you can only fix it with screws, the temperature difference between thermal expansion and contraction will act repeatedly, the corner seam will slowly open, the sealing rubber strip will be misplaced, and there will be air leakage, water seepage, and abnormal switch noises. 70 Broken bridge casement doors can be used as single door, child and mother door, and opposite door. The middle stile in the middle of the child and mother door is also reinforced by injection angle, and the middle stile is under great force. After long-term use after reinforcement, it is not easy to twist and dislocate.

[Sealed drainage node diagram | Three-channel EPDM seal, isobaric chamber, hidden drainage, threshold water stop structure schematic diagram]

III. Sealing and drainage systems to solve the core pain points of air leakage and water seepage

The 70 broken bridge swing door is equipped with three EPDM EPDM sealing rubber strips as standard, which are integrally bent without breakpoints. The rubber strips are resistant to high and low temperatures, anti-aging, and have long-lasting elasticity. The first outer rubber strip blocks rainwater and dust; the middle rubber strip builds an isobaric chamber to balance the internal and external air pressure and resist the backflow of rainwater during rainstorms; the inner rubber strip isolates the leakage of indoor air conditioning and heating, and improves air tightness. Low-priced products use PVC rubber strips, which are hard and shrink after 1-2 years of exposure to the sun, and the seal fails directly.

The drainage adopts a hidden isobaric drainage structure. After the rainwater enters the cavity, it flows along the diversion groove to the outer drainage hole. The drainage hole is equipped with a windproof cover to block the entry of strong wind and mosquito dust. The outdoor 70 broken bridge swing door is equipped with a special low threshold water stop structure. The threshold height is reasonable, which is convenient for carts, the elderly and children to pass. At the same time, a water stop step is set to block the ground rainwater from pouring back into the room.

Many ordinary broken bridge doors only rely on surface gluing and waterproofing, and the sealant has a service life. It leaks after 5-8 years of aging and cracking. The 70 system gives priority to structural drainage, supplemented by sealant, to reduce the probability of water seepage from the structural level.

[Hardware accessories close-up | 70 swing door heavy-duty hinge, multi-point lock actuator, silent lock body, handle, windproof latch]

Fourth, the supporting hardware system affects the opening and closing feel and service life

The weight of the door leaf of the 70 broken bridge swing door is too large, and it needs to be matched with special swing door heavy-duty hardware, and light window hardware cannot be used. The three-dimensional adjustable heavy-duty hinge is preferred for the hinge, and the load-bearing specifications are 100kg and 120kg. It supports three-dimensional adjustment of up, down, left and right, front and rear. After the door leaf has been used for a period of time to sink slightly, the correction gap can be fine-tuned to avoid locking dislocation and scratching the profiles.

The lock adopts a multi-point locking system, which is different from a single-point lock. After closing the door leaf, multiple sets of lock points synchronously bite the lock seat, and the rubber strips around are evenly pressed to improve the anti-theft performance and air tightness simultaneously. The lock body can be selected as a mechanical silent lock, or it can be upgraded with a matching smart fingerprint lock, which is suitable for home entry and courtyard locations.

For outdoor use scenarios, windproof limiters can be installed, and the opening angle can be fixed in windy weather to prevent the door leaf from being hit by the wind, pulling the hinges and bumping the wall. Hardware priority is given to first-line brands such as Haobo and Gewu. The whole set of hardware quality assurance is independent, and miscellaneous hardware is prone to cards, rust, and broken hinges.

[Comparison chart of glass samples | 5 + 20A + 5 hollow tempered, Low-E hollow, laminated hollow glass samples, close-up of warm edge spacers]

Glass matching scheme, taking into account lighting, sound insulation and energy saving as needed

The glass slot of the 70 broken bridge casement door is suitable for insulating glass with a maximum thickness of 24mm. The mainstream standard is 5 + 20A + 5 double glass hollow tempered glass, and the hollow layer is 20A. The thermal insulation and sound insulation performance is better than that of the 12A small hollow. The glass must be marked with 3C toughening, which is granular after breaking, reducing the risk of injury.

For apartments facing the street and close to the main road, laminated insulating glass can be used to reduce low-frequency traffic noise and provide sound insulation of up to 32-36dB. In hot areas, low-emissivity insulating glass can be used to reflect infrared heat, reduce summer sunlight radiation into the room, and reduce air conditioning energy consumption. For privacy, matte and Changhong art glass can be used, which are mostly used for indoor partition doors.

Glass spacers give priority to warm edge strips, reducing glass edge cold bridges, and reducing the probability of glass condensation in winter; inferior aluminum spacers conduct heat quickly, and the corners are prone to fogging. Hollow glass cannot be repaired after fogging and entering water, and can only be replaced as a whole.

[Screenshot of performance test report | 70 broken bridge swing door anti-wind pressure, water tightness, air tightness, thermal insulation performance classification summary]

Six, 70 broken bridge swing door core performance parameters

According to the national standard GB/T7106, GB/T8478 test, a set of qualified 70 broken bridge swing door reference performance indicators:

Wind pressure resistance: conventional ≥4 level, high-rise and coastal windward areas can achieve 6 levels, and the fan body will not be deformed or unlocked under strong wind;

Watertight performance: ≥3 grade, rainstorm conditions, frame fan joints without leakage;

Air tightness: ≥6 grade, excellent air tightness, reducing hot and cold air penetration, reducing heating and cooling energy consumption;

Insulation K value: with Low-E20A insulating glass, K value can reach 2.4~ 2.8 W/(m2 · K), meeting the energy saving acceptance in most regions;

Sound insulation performance: about 30dB in ordinary hollow, up to 36dB in laminated hollow.

Here to correct the misunderstanding: the thicker the wall thickness, the better the performance. Without a reasonable multi-cavity, three-seal, and isobaric drainage design, simply thickening the aluminum material will still fail to meet the system door standards.

[Installation and construction real shot | hole cleaning, frame leveling, fixing piece reinforcement, gap foam filling, waterproof closing construction]

Standardized installation process, three points of product and seven points of installation

70 broken bridge swing door is a customized product, the hole size error, installation is not in place, no matter how good the system profile will fail.

The first step is to accurately measure on site, distinguish between inner opening, outer opening, and opening directions, and confirm that the wall is solid brick and hollow brick. The hollow brick wall needs to be reinforced with concrete in advance, and expansion screws cannot be directly hit;

The second step is to clean the hole, remove bumps and floating ash, and ensure that the installation base surface is flat;

The third step is to position the door frame, correct the horizontal and vertical, control the diagonal error, and ensure that the closing gap is uniform;

The fourth step is to fix, the fixed pieces are arranged by encryption, and the fixed fulcrum is increased at the force position;

The fifth step is to fill the gap, fill the gap between the frame and the wall with high-density polyurethane foam, and fill it fully;

The sixth step is to waterproof and close the outer wall, and seal the outer wall with neutral weathering silicone glue to stop water;

The seventh step is hardware debugging, repeatedly opening and closing the door leaf, debugging the hinge and multi-point lock to ensure that the switch is smooth and the lock is in place;

The eighth step is acceptance test, check that the sealing gap and drain hole are unobstructed, and the switch has no abnormal sound.

The closure of the outer wall is a high-frequency point of water leakage, and waterproof flooding treatment cannot be omitted.

[Style real picture | 70 broken bridge casement door single door, child and mother door, opposite door, style real scene with fixed bright window]

Applicable scenarios and style selection

70 Broken bridge casement doors are rich in styles, and single doors are suitable for small hole side doors and indoor partitions; mother and child doors are popular choices for balcony doors and entry doors. Daily small doors are used, and large pieces of furniture enter and exit to open the door; the door is atmospheric and transparent, suitable for large and wide villa balconies and shops; the style with bright windows is suitable for high door heads, improving lighting and increasing the proportion of facades.

Applicable scenarios: residential balcony partition doors, villa courtyard side doors, first floor entry doors, shop office channel doors, sun room matching swing doors;

It is not suitable for heavy-duty doors with oversized openings. It is recommended to choose heavy-duty system doors above 75 and 80 for oversized door leaves.

[Comparison of advantages and disadvantages details | Comparison of three-channel sealed 70 system door with glue injection group angle vs simple non-glue injection and single-channel sealed ordinary broken bridge door]

Nine, choose the key points to avoid pits and avoid the industry reduction routine

The wall thickness of the virtual label is 2.0mm, but only 1.4-1.6mm thin-walled recycled aluminum is actually available;

The PVC thermal insulation strip pretends to be PA66 nylon thermal insulation strip, and the thermal insulation fails;

Omit the angle of the pin injection group, only the screw is simply fixed, and the corner seam will crack and seep water later;

Single and two seals pretend to be three seals, and the rubber strip is simplified;

Ordinary light hinges pretend to be heavy hinges, the door leaf sags and the lock point is misplaced;

Ordinary hollow aluminum spacers replace warm edge strips, and the glass is easy to fog and dew;

The quotation is only for bare frame glass, and the price will be increased later for reinforced, waterproof and smart locks.

The order contract states the profile wall thickness, thermal insulation strip material, sealing strip, hinge load-bearing, glass configuration, corner forming process, and quality assurance years.

[Maintenance schematic diagram | Clean drain holes, hinge lubrication, rubber strips, sealant inspection and maintenance]

Daily maintenance to extend the service life of the product

Regularly clean up the sediment and fallen leaves in the drainage hole to prevent blockage of water; hinge, multi-point lock transmission position, add silicon-based lubricant every year, do not use oil, oil is easy to absorb dust, resulting in card; check the outer weathering glue every year, crack, drum and remove in time and re-glue; rubber strip aging and hardening, fall off and replace in time; avoid vigorously hitting the door leaf, do not hang heavy objects on the door leaf, reduce long-term overload of the hinge; fluorocarbon spray surface with water + neutral detergent wipe, prohibit strong acid and alkali corrosion coating.

[Panoramic completed picture | Balcony 70 Broken Bridge Child and Mother Swing Door Overall Floor Real Scene]

conclusion

The 70 broken bridge swing door system is not a simple broken bridge aluminum door frame with glass, but a standardized door and window system designed through structure, sealing, drainage and hardware. Compared with the 60 and 65 small series, the cavity space is larger, the sealing configuration and hardware are more adaptable, and the cost performance and comprehensive performance are taken into account. It is the mainstream choice for home decoration balcony doors and courtyard doors.

When purchasing a 70 broken bridge swing door, you can't just compare the unit price and color. Priority is given to confirming the wall thickness of the original aluminum profile, PA66 heat insulation strip, pin glue injection group angle, three EPDM sealing, isobaric drainage, and heavy-duty multi-point hardware. With standardized reinforcement and waterproof installation, the effects of heat preservation, sound insulation, water seepage prevention, and anti-theft can be achieved for a long time, taking into account home comfort and safety.