Concrete cast-in-place integrated anti-seismic passive house with double-heat-preservation function

Abstract

The invention discloses a concrete cast-in-place integrated anti-seismic passive house with a double-heat-preservation function, and relates to the technical field of building construction, a composite heat-preservation wall body structure sequentially comprises a permanent outer formwork, a foam powerful composite heat-preservation plate, a heat-preservation core plate, an inner anti-crack layer, an outer anti-crack layer and a bonding layer from outside to inside, a cement mortar leveling layer, an anti-crack mortar layer and a facing layer are arranged on the outer surface of the outer layer; a heat preservation layer is arranged in the middle, and a galvanized welded wire mesh reinforced heat preservation steel formwork is connected with the permanent outer formwork in an anchoring mode through a split type connecting piece; in the cast-in-place concrete layer, C30 concrete is poured between the permanent outer formwork and the middle heat preservation layer, and a cavity-free integrated structure is formed; the built-in steel mould net enhances the integrity of the wall body and meets the high anti-seismic requirement; in construction, heat preservation and formwork functions are integrated, the construction period is greatly shortened, the manufacturing cost is reduced, and finally systematic improvement of building heat preservation, the same service life of a structure and complete-period maintenance-free is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building construction, in particular to a concrete cast-in-place integrated passive house with double insulation function. BACKGROUND

[0002] Building construction refers to the whole process of converting design drawings into physical buildings, covering all production activities from construction preparation to completion acceptance, mainly including foundation engineering, main structure construction, decoration engineering and other stages. The core is to realize the conversion of engineering blueprint to physical space, and balance quality, safety, progress and cost control.

[0003] Traditional building external wall insulation system has common structural defects and performance short boards:

[0004] Safety hazards are prominent:

[0005] Organic insulation materials (such as polystyrene foam) are flammable, release toxic gases during fire, and are prone to hollowing and falling, threatening personal safety;

[0006] Insufficient anchoring reliability, and the insulation layer is prone to peeling under strong wind or earthquake.

[0007] Low durability:

[0008] The performance of the insulation layer is accelerated to decay (annual decay rate > 3%) under the influence of ultraviolet rays, freeze-thaw cycles, etc. Cracks in the joint lead to water seepage, mold growth, and shorten the service life of the building.

[0009] Energy efficiency bottleneck:

[0010] Single-layer insulation is difficult to meet the requirements of passive house with ultra-low heat transfer coefficient (K≤0.15W / (m 2 ·K));

[0011] Cold and hot bridge effect is significant, and the actual energy saving rate is less than 50%.

[0012] Construction inefficiency:

[0013] Insulation layer and structure are constructed in layers, with complex procedures, long cycle, and labor cost accounting for more than 30%;

[0014] On-site cutting and splicing have poor precision, which aggravates the quality risk.

[0015] In view of the above problems, a passive house with double insulation structure is designed by combining a strong composite insulation material with a middle insulation steel formwork, to solve the above technical problems. SUMMARY

[0016] In view of the deficiencies of the prior art, the present application provides a concrete cast-in-place integrated anti-seismic passive house with double thermal insulation functions, which solves the technical problems raised in the above background art.

[0017] To achieve the above object, the present application is implemented by the following technical scheme: a concrete cast-in-place integrated anti-seismic passive house with double thermal insulation functions, comprising:

[0018] The composite thermal insulation wall structure is sequentially composed of:

[0019] The permanent outer formwork is a strong composite bubble formwork, which comprises a thermal insulation core board, inner and outer crack-resistant layers and a bonding layer, and is provided with a cement mortar leveling layer, a crack-resistant mortar layer and a finishing layer on the outer surface.

[0020] The middle thermal insulation layer is a thermal insulation steel formwork net reinforced by a galvanized electric welding net, which is anchored and connected with the permanent outer formwork through a split connecting piece.

[0021] The cast-in-place concrete layer is formed by pouring C30 concrete between the permanent outer formwork and the middle thermal insulation layer, and forms an integrated structure without cavity.

[0022] Core performance parameters:

[0023] The seismic fortification intensity is greater than or equal to 8 degrees.

[0024] The comprehensive energy saving rate is greater than or equal to 80%.

[0025] The heat transfer coefficient K is less than or equal to 0.15 W / (m 2 ·K), and the air tightness n 50 is less than or equal to 0.6h -1 .

[0026] Key structure limitation:

[0027] The density of the split connecting piece is greater than or equal to 8 per square meter, and the spacing of the connecting pieces at the edges of the door and window openings is less than or equal to 300 mm.

[0028] The total thickness of the permanent outer formwork is greater than or equal to 50 mm, wherein the thickness of the thermal insulation core board is greater than or equal to 40 mm and the density is greater than or equal to 35 kg / m 3 .

[0029] Preferably, the strong composite bubble formwork comprises a five-layer composite structure:

[0030] The outer side is a 5mm-thick polymer crack-resistant mortar layer.

[0031] The middle is a 2mm-thick bonding layer + a thermal insulation core board, an extruded polystyrene with a thermal conductivity coefficient less than or equal to 0.030 W / (m·K) + a 3mm-thick cement-based crack-resistant layer.

[0032] The inner side is a thermal insulation transition layer, a polymer mortar with an elastic modulus less than or equal to 100 MPa.

[0033] Preferably, the thermal bridge blocking design includes:

[0034] The joints of the insulation boards are joined using irregular tongue and groove joints, with a gap width of ≤1mm;

[0035] L-shaped insulation wrapping components with an extension length of ≥200mm are installed on concrete beams and columns.

[0036] Preferably, the construction method includes the following necessary steps:

[0037] (a) Mark the positions according to the design layout drawing and cut non-standard insulation boards on site;

[0038] (b) Use a pistol drill to install split connectors, with ≥8 connectors per square meter;

[0039] (c) First erect the outer formwork for insulation and tie the connectors to the steel mesh, then erect the inner wooden formwork;

[0040] (d) The double template is fixed with tie bolts, and the transverse main ribs are made of double Φ48×3.5mm steel pipes;

[0041] (e) When pouring concrete, a U-shaped galvanized iron sheet edge protector shall be installed at the top of the insulation formwork;

[0042] (f) After demolding, fill with self-insulating blocks and lay 200mm wide alkali-resistant fiberglass mesh at the joints to prevent cracking.

[0043] Preferred application scenarios include:

[0044] New frame / shear wall structure buildings;

[0045] In the renovation of existing buildings, the original exterior wall insulation layer is replaced, and a seismic reinforcement layer is added simultaneously.

[0046] Beneficial effects

[0047] This invention provides a cast-in-place integrated earthquake-resistant passive house with dual thermal insulation functions. Through a double-layer insulation structure of composite insulation boards and steel mesh, this invention significantly improves thermal insulation performance and achieves ultra-low energy consumption. The cavity-free anchoring design of the split connectors and concrete completely solves the problems of insulation layer detachment and cracking. The fully encapsulated fireproof structure with cement mortar eliminates fire hazards. The built-in steel mesh enhances the integrity of the walls, meeting high earthquake resistance requirements. During construction, the insulation and formwork functions are integrated, significantly shortening the construction period and reducing costs, ultimately achieving a systemic improvement where building insulation and structure have the same lifespan and require no maintenance throughout the entire lifespan. Attached Figure Description

[0048] Fig. 1 This is a flowchart diagram.

[0049] Fig. 2 This is a schematic diagram of a high-strength foam composite insulation board.

[0050] Fig. 3 This is a schematic diagram of cast-in-place concrete with built-in insulation for a split-type connector. Detailed Implementation

[0051] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0052] Please see Figs. 1-3 This invention provides a technical solution: a cast-in-place integrated earthquake-resistant passive house with dual thermal insulation function, comprising:

[0053] Composite thermal insulation wall structure: from the outside to the inside, it consists of:

[0054] Permanent external formwork: Molded foam high-strength composite insulation board includes insulation core board, inner and outer crack-resistant layers and adhesive layer, and its outer surface is provided with cement mortar leveling layer, crack-resistant mortar layer and finishing layer;

[0055] Central insulation layer: Insulating steel formwork reinforced with galvanized welded wire mesh, which is anchored to the permanent outer formwork through split connectors;

[0056] Cast-in-place concrete layer: C30 concrete is poured between the permanent outer formwork and the central insulation layer to form a cavity-free integrated structure;

[0057] Core performance parameters:

[0058] Seismic fortification intensity ≥ 8 degrees;

[0059] Overall energy saving rate ≥80%;

[0060] Heat transfer coefficient K≤0.15W / (m²) 2 ·K), airtightness n 50 ≤0.6h -1 ;

[0061] Key construction constraints:

[0062] The density of split connectors is ≥8 pieces / square meter, and the spacing of connectors at the edge of door and window openings is ≤300mm;

[0063] The total thickness of the permanent outer formwork is ≥50mm, of which the insulation core board is ≥40mm thick and has a density ≥35kg / m³. 3 .

[0064] In this embodiment, the high-strength composite insulation board comprises a five-layer composite structure:

[0065] Outer side: 5mm thick polymer crack-resistant mortar layer;

[0066] Middle: 2mm thick adhesive layer + thermal insulation core board, extruded polystyrene, thermal conductivity ≤0.030W / (m·K) + 3mm thick cement-based crack-resistant layer;

[0067] Inner side: Thermal insulation transition layer, polymer mortar with an elastic modulus ≤100MPa.

[0068] This embodiment is further configured such that the thermal bridge blocking design includes:

[0069] The joints of the insulation boards are joined using irregular tongue and groove joints, with a gap width of ≤1mm;

[0070] L-shaped insulation wrapping components with an extension length of ≥200mm are installed on concrete beams and columns.

[0071] This embodiment further specifies that the construction method includes the following necessary steps:

[0072] (a) Mark the positions according to the design layout drawing and cut non-standard insulation boards on site;

[0073] (b) Use a pistol drill to install split connectors, with ≥8 connectors per square meter;

[0074] (c) First erect the outer formwork for insulation and tie the connectors to the steel mesh, then erect the inner wooden formwork;

[0075] (d) The double template is fixed with tie bolts, and the transverse main ribs are made of double Φ48×3.5mm steel pipes;

[0076] (e) When pouring concrete, a U-shaped galvanized iron sheet edge protector shall be installed at the top of the insulation formwork;

[0077] (f) After demolding, fill with self-insulating blocks and lay 200mm wide alkali-resistant fiberglass mesh at the joints to prevent cracking.

[0078] This embodiment is further configured such that the application scenarios include:

[0079] New frame / shear wall structure buildings;

[0080] In the renovation of existing buildings, the original exterior wall insulation layer is replaced, and a seismic reinforcement layer is added simultaneously.

[0081] Its detailed connection method is a well-known technology in this field. The following mainly introduces the working principle and process, and the specific work is as follows.

[0082] Example: 1. Structural composition and material specifications

[0083] Component technical details

[0084] - Dimensions: 1200×600mm (standard panel), thickness 50±0.5mm (factory prefabricated)

[0085] Hierarchical structure:

[0086] • Outer side: 5mm thick polymer-modified crack-resistant mortar (compressive strength ≥12MPa)

[0087] High-strength composite foam

[0088] Intermediate layer: 2mm interface bonding mortar + 40mm extruded polystyrene board (XPS) (density 38kg / m³) 3 Thermal conductivity plate

[0089] 0.028 W / (m·K), compressive strength ≥250 kPa)

[0090] • Inner side: 3mm cement-based crack-resistant layer (alkali-resistant fiberglass mesh reinforcement) + elastic transition layer (polymer-modified mortar, elastic modulus 90MPa)

[0091] Component technical details

[0092] -Galvanized welded wire mesh (mesh size 50×50mm, wire diameter 3mm, weld tensile strength ≥500N)

[0093] Insulated steel mesh in the middle

[0094] - Filling with rock wool insulation layer (50mm thickness, Class A fireproof, density ≥140kg / m³) 3 )

[0095] -LS-5 type nylon anchor (length 120mm, anchoring depth 60mm)

[0096] Split-type connector - tensile strength ≥ 0.8kN (tested according to JG / T 366-2012)

[0097] -Layout density: 8 per square meter on standard walls, and 6 per square meter at the edges of openings.

[0098] -C30 pumped concrete (water-cement ratio 0.45, fly ash content 20%)

[0099] concrete

[0100] - Slump control: 170±10mm (to avoid segregation)

[0101] Construction process and key control points

[0102] Step 1: Base treatment and surveying / layout

[0103] Clean the surface of the shear wall reinforcement and apply anti-rust paint;

[0104] Set double lines (positioning line + inspection line) according to the layout diagram, with an allowable deviation of ≤2mm / 10m.

[0105] Step 2: Installation and anchoring of insulation boards

[0106] Control point: L-shaped whole panels are used for door and window openings to reduce seams.

[0107] Step 3: Double-formwork support system

[0108] Outer template: Molded foam insulation board, with polyurethane foam injected at the tongue and groove joints (thermal conductivity...

[0109] ≤0.025W / (m·K));

[0110] Inner template: 15mm thick plywood, secondary ribs 40×70mm fir timber squares @300mm, main ribs double Φ48×3.5mm steel pipes @450mm;

[0111] Tie bolts: M14 through thread @ 450×450mm, with a rubber sealing ring installed where they pass through the insulation board.

[0112] Step 4: Concrete pouring and curing

[0113] Before pouring, install U-shaped galvanized iron sheet edge protection (height ≥ 50mm) on the top edge of the insulation board;

[0114] Layered pouring thickness ≤ 500mm, vibrator distance ≥ 200mm from insulation board (to prevent deformation);

[0115] Demolding conditions: The strength of the specimen under the same conditions is ≥15MPa (approximately 48 hours).

[0116] Step 5: Treatment of self-insulating masonry and joints

[0117]

[0118] Performance verification results

[0119] Thermal insulation performance:

[0120] Heat transfer coefficient K = 0.12 W / (m²) 2 •K)(GB / T 13475-2008 Protective thermal chamber method, temperature difference 20℃)

[0121] Thermal bridge coefficient ψ = 0.01 W / (m·K) (detected by infrared thermal imager, ambient temperature -10℃)

[0122] Structural safety:

[0123] Seismic performance: Passed the shaking table test of an 8-degree rare earthquake (inter-story drift angle 1 / 120, in compliance with JGJ / T101-2015).

[0124] Tensile pull-out force of connector: 0.85kN (6.25% higher than standard value)

[0125] 3.2 On-site measurements (12 months after completion)

[0126]

[0127] Typical application scenario expansion

[0128] School buildings:

[0129] LS-2 type insulation board is used (with added fire-resistant gypsum coating, fire resistance limit ≥1.5h);

[0130] The corridor walls have a built-in 50mm rock wool sound-absorbing layer (noise reduction coefficient NRC≥0.8).

[0131] Industrial plant renovation:

[0132] The existing brick wall external mounting system (anchor bolt insertion depth ≥100mm) improves the energy saving rate to 65%.

[0133] It should be noted that in this paper, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

Claims

1. A concrete cast-in-place integrated anti-seismic passive house with double thermal insulation function, characterized in that, Comprise: Composite thermal insulation wall structure: from outside to inside in turn: Permanent external formwork: strong composite thermal insulation board with thermal insulation core board, inner and outer crack-resistant layers and adhesive layer, the outer surface is provided with cement mortar leveling layer, crack-resistant mortar layer and finishing layer; Middle thermal insulation layer: galvanized electric welding net reinforced thermal insulation steel formwork, anchored and connected with the permanent external formwork through split type connecting piece; Cast-in-place concrete layer: C30 concrete is poured between the permanent external formwork and the middle thermal insulation layer to form an integrated structure without cavity; Core performance parameters: Seismic fortification intensity ≥ 8 degrees; Comprehensive energy saving rate ≥ 80%; Heat transfer coefficient K < 0.15 W / (m 2 ·K), air tightness n 50 < 0.6 h -1 ; Key structure limitation: The density of split type connecting piece is ≥ 8 per square meter, and the spacing of connecting piece at the edge of door and window opening is ≤ 300 mm; Permanent formwork total thickness ≥ 50 mm, with insulation core board thickness ≥ 40 mm and density ≥ 35 kg / m 3 .

2. The concrete cast-in-place integrated anti-seismic passive house with double thermal insulation function according to claim 1, characterized in that The strong composite thermal insulation board contains five layers of composite structure: Outside: 5mm thick polymer crack-resistant mortar layer; Middle: 2mm thick adhesive layer + thermal insulation core board, extruded polystyrene, thermal conductivity coefficient ≤ 0.030 W / (m·K) + 3mm thick cement-based crack-resistant layer; Inside: thermal insulation transition layer, polymer mortar with elastic modulus ≤ 100 MPa.

3. The concrete cast-in-place integrated anti-seismic passive house with double thermal insulation function according to claim 1, characterized in that Cold and hot bridge blocking design includes: Thermal insulation board joint uses special-shaped rebate joint, gap width ≤ 1mm; L-shaped thermal insulation covering piece is set at the concrete beam and column part, with extension length ≥ 200mm.

4. The concrete cast-in-place integrated anti-seismic passive house with double thermal insulation function according to claim 1, characterized in that Construction method includes the following necessary steps: (a) Positioning according to the design layout, cutting non-standard thermal insulation board on site; (b) Install split type connecting piece by hand gun drill, ≥ 8 per square meter; (c) First stand the thermal insulation external formwork and tie the connecting piece to the steel mesh, then stand the inner wooden formwork; (d) Fix the double formwork by penetrating the anchor bolt, the horizontal main rib uses double Φ48×3.5mm steel pipe; (e) When pouring concrete, set U-shaped galvanized iron sheet edge protection on the thermal insulation formwork; (f) After demolding, fill self-insulation block, and lay 200mm wide alkali-resistant glass fiber mesh cloth at the joint for crack resistance.

5. The concrete cast-in-place integrated anti-seismic passive house with double thermal insulation function according to claim 1, characterized in that Application scenarios include: New frame / shear wall structure building; Replace the original external wall insulation layer in existing building renovation, and simultaneously add seismic reinforcement layer.

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