CN-121976627-A - Composite outer wall based on UHPC panel and construction method thereof

CN121976627ACN 121976627 ACN121976627 ACN 121976627ACN-121976627-A

Abstract

The invention discloses a composite outer wall based on a UHPC panel and a construction method thereof, wherein the composite outer wall comprises an outer wall main body, and the outer wall main body is connected between a steel beam and a steel column; the outer wall main body is formed by combining a steel keel frame and UHPC plates, the UHPC plates are connected to the steel keel frame through a first connecting piece, and the steel keel frame is fixed to a steel beam through a second connecting piece or directly welded. The UHPC board can be connected with the steel beam through the steel keel frame to realize cooperative stress, so that the structural stability and the function are integrated, the heat insulation performance and the fire resistance of the UHPC board are excellent, the light, high-strength, fireproof, heat-insulating, durable and maintenance-free performances of the composite outer wall are realized, the heat insulation board is suitable for the outer wall of a building with strict requirements on performances, and the heat insulation board has wide application prospect.

Inventors

Mao Decan
ZHENG FENG
QIN GUOSHUN
LU YINGJIE

Assignees

启臻质构(嘉兴)科技有限公司

Dates

Publication Date: 20260505
Application Date: 20260209

Claims (10)

1. The composite outer wall based on the UHPC panel comprises an outer wall main body, wherein the outer wall main body is connected between a steel beam and a steel column; The method is characterized in that: The outer wall main body is formed by combining a steel keel frame and UHPC plates, the UHPC plates are connected to the steel keel frame through a first connecting piece, and the steel keel frame is fixed to the steel beam through a second connecting piece or direct welding.
2. The UHPC panel-based composite outer wall of claim 1, wherein the steel keel frame comprises a vertical steel keel, a horizontal steel keel and a top-bottom steel keel, the top-bottom steel keel is fixed on the steel beams on the upper side and the lower side through a second connecting piece or directly welded, the vertical steel keel is connected with the top-bottom steel keel and the bottom steel keel through a first connecting piece, the horizontal steel keel is connected with the vertical steel keel through a first connecting piece, wherein the first connecting piece is a self-tapping screw or a clamping piece, and the second connecting piece is a steel structure self-tapping screw.
3. The UHPC panel-based composite outer wall of claim 2, wherein the vertical steel keels, the horizontal steel keels and the top-bottom steel keels are all made of hot dip galvanized steel or steel subjected to corrosion prevention treatment.
4. The UHPC panel-based composite outer wall of claim 1, wherein the UHPC panel is a composite sandwich structure, and comprises an outer panel, a core panel and an inner panel which are sequentially combined, wherein the outer panel and the inner panel are bonded with the core panel through an interface reinforcing layer.
5. The UHPC panel-based composite exterior wall of claim 4, wherein the interface reinforcing layer comprises glass fiber mesh cloth pre-embedded in the outer panel and the inner panel and inorganic adhesive sprayed on the inner side of the outer panel and the outer side of the inner panel, and the glass fiber mesh cloth is in a zigzag structure.
6. The UHPC panel-based composite outer wall of claim 4, wherein the core board comprises a dampproof layer, a heat insulation layer and a sound insulation layer, the dampproof layer is made of a high-molecular waterproof breathable film or PE composite aluminum foil, the thickness of the dampproof layer is 0.2-1.5 mm, the heat insulation layer is made of foaming polyurethane, the thickness of the heat insulation layer is 50-200 mm, the sound insulation layer is made of high-density damping felt or sound-absorbing cotton, and the thickness of the sound insulation layer is 2-10 mm.
7. The UHPC panel-based composite outer wall of claim 4, wherein the outer panel is a UHPC panel, 1-5% of steel fiber or glass fiber and 0.5-2% of nano modifier are doped in a matrix of the outer panel, and the thickness of the outer panel is 3-100 mm.
8. The UHPC panel-based composite outer wall of claim 4, wherein the inner panel is at least one of an European board, a gypsum board or a cement fiber board, and the thickness of the inner panel is 5-100 mm.
9. The UHPC panel-based composite exterior wall of claim 1, wherein a silicone sealant or a modified silane sealant is filled between the UHPC panel and the steel beams and the steel columns.
10. The construction method of a composite exterior wall based on a UHPC panel according to any one of claims 1 to 9, characterized by comprising the steps of: s1, steel keel frame installation A. firstly, fixing a top-bottom steel keel on steel beams on the upper side and the lower side through intermittent welding or a second connecting piece; b. then, the vertical steel keels are placed between the upper and lower vertical steel keels at equal intervals, the vertical steel keels are connected with the vertical steel keels through connecting pieces, and the horizontal interval between every two adjacent vertical steel keels is 30-60 cm; c. Then installing transverse steel keels between the vertical steel keels, wherein the transverse steel keels are connected with the vertical steel keels through first connecting pieces and are distributed between the upper and lower steel keels at equal intervals; S2, UHPC board construction A. Firstly, connecting an inner panel with a transverse steel keel and a vertical steel keel through a first connecting piece, and embedding glass fiber mesh cloth on the inner panel; b. Then spraying inorganic binder on the outer side of the inner panel, performing sound insulation layer construction along the outer side of the inner panel, spraying foaming polyurethane on the outer side of the sound insulation layer after the sound insulation layer is installed to form a heat insulation layer, and performing dampproof layer construction along the outer side of the heat insulation layer to form a core plate with a dampproof layer, a heat insulation layer and a sound insulation layer distributed from outside to inside in sequence; c. Embedding glass fiber mesh cloth in the UHPC board, spraying an inorganic binder along the inner side surface of the UHPC board, adhering the inorganic binder to the outer side of the core board, connecting the UHPC board with the vertical steel keels and the horizontal steel keels through the first connecting piece, and reserving expansion joints with the width of 5-10 mm between the periphery of the inner panel and the outer panel and between the periphery of the steel beams and the steel columns; S3, sealing treatment Filling silicone sealant or modified silane sealant in the expansion joint; S4, performance detection A. and detecting wind pressure resistance, air tightness, water tightness and acoustic performance of the UHPC board: when wind pressure resistance is detected, a UHPC board test piece is preloaded, 50% of a design wind load standard value is applied, the load is held for 10min, whether an instrument is normal or not is checked, then grading loading is carried out, the loading value of each grade is 20% of the design wind load standard value, the load is held for 5min, deformation data of a steel keel frame and a panel are recorded, limiting loading is carried out, loading is carried out to the design wind load design value, the load is held for 1h, whether cracking, panel falling and steel keel frame buckling phenomena occur or not is observed, unloading is carried out finally, grading unloading is carried out to 0, and residual deformation is recorded; When in airtight detection, firstly, positive pressure and negative pressure are applied to a UHPC plate test piece, the pressure difference is classified into 50Pa, 100Pa, 150Pa and 250Pa, then data acquisition is carried out, after each stage of pressure is stable, 3 times of air permeation quantity is recorded, an average value is obtained, and finally, the unit area of air permeation quantity is converted according to the area of the UHPC plate test piece; When watertight detection is carried out, pre-spraying is carried out on a UHPC board test piece, a spraying system is started, spraying is continued for 10min, the surface of the UHPC board test piece is wetted, pressurized spraying is carried out, lateral pressure is applied in a grading manner, the pressure of each grade is 20% of the designed watertight pressure, each grade holds a load for 10min, spraying is kept at the same time, whether water seepage and wetting marks appear on the inner side of the UHPC board test piece or not is observed under each grade of pressure, the pressure value when water seepage occurs for the first time is recorded, and finally limit verification is carried out, loading is carried out to the designed watertight pressure value, the load is kept for 30min, and no water seepage phenomenon is confirmed; During acoustic performance detection, respectively measuring background noise in a reverberation chamber and a sound elimination chamber to ensure that detection requirements are met, transmitting stable broadband noise in the reverberation chamber, recording the average sound pressure level L1 of the reverberation chamber, measuring the sound pressure level L2 of a UHPC plate test piece in the sound elimination chamber, calculating a weight sound insulation amount Rw=L1-L2-correction value, and superposing a frequency spectrum correction amount Ctr to obtain Rw+ctr; b. The method comprises the steps of carrying out safety detection on a stress system, pre-loading a UHPC plate test piece, applying 10% of design pulling resistance, holding the load for 5min, checking whether the UHPC plate test piece is firmly connected with an instrument, carrying out constant-speed recording, loading at a speed of 1kN/s, implementing load-displacement curve recording, then carrying out target loading, loading to 1.2 times of the design pulling resistance, holding the load for 30min, observing whether weld cracking, base metal yielding and anchor slipping occur at a node, finally carrying out destructive loading, if the ultimate pulling resistance is required to be measured, continuing loading to node destruction, and recording an ultimate load value; c. deflection test is carried out on the steel keel frame, and the strength of the welding line and the steel keel frame is verified: When deflection test is performed, firstly, displacement meters are arranged at the midspan, 1/4 span and 3/4 span of the steel joist frame, the dial gauge is arranged at the connection point of the UHPC plate and the steel joist frame, then the dial gauge is converted into linear load according to a wind load standard value, the linear load is uniformly applied to the steel joist frame, the linear load is kept for 10min, the lateral displacement value of each detection point is read, the midspan maximum deflection f is calculated, whether f is less than or equal to L/250 is met or not is verified, finally, unloading inspection is performed, residual deformation of the steel joist frame is measured after unloading, and the residual deformation amount is less than or equal to 5% of the maximum deflection; When the intensity of the welding line is detected, firstly calibrating the sensitivity and the measuring range of a digital ultrasonic flaw detector, then scanning the welding line, scanning the probe along two sides of the welding line at the speed of 100-150mm/s, wherein the scanning range is the width of the welding line plus 2 times of the thickness of a base material, finally judging the defects, recording the positions, the sizes and the equivalent of the defects, and evaluating the grade of the defects; When the welding line is in bending test, the welding line bending test piece is cut, the welding line is positioned between a bending center and a support, the bending test piece is bent to 180 degrees at a speed of 1mm/min, no crack is visible to naked eyes in the welding line and a heat affected zone after bending, and the welding line is judged to be qualified.

Description

Composite outer wall based on UHPC panel and construction method thereof Technical Field The invention relates to the technical field of building outer walls, in particular to a composite outer wall based on a UHPC panel and a construction method thereof. Background As a key part of the building enclosure structure, the building outer wall not only bears the functions of isolating the outdoor environment and guaranteeing the stability of the indoor physical environment, but also directly influences the overall energy consumption, durability, safety and appearance of the building. Along with the promotion of building industrialization and the continuous improvement of the requirements of people on building performance, energy conservation and environmental protection, the requirements on the comprehensive performances of light weight, high strength, heat preservation, heat insulation, sound insulation, noise reduction, fire prevention, durability, convenient assembly, low carbon, environmental protection and the like of an outer wall system are more stringent. Conventional exterior wall systems, such as masonry walls, precast concrete wall panels, or curtain wall systems, often have limitations in material properties or system integration. For example, a common concrete outer wall has large self weight, low tensile strength and easy cracking, and the heat insulation performance usually depends on an additional heat insulation layer, so that risks of falling off, insufficient fireproof grade and the like exist. Although the curtain wall system realizes the separation of the structure and the enclosure, the complex supporting structure, a large number of on-site sealing operations and the connection of the panel and the main body structure are generally difficult to realize real cooperative stress, and the stability of the whole structure and the further improvement of wind resistance and earthquake resistance are restricted. UHPC (ultra-high performance concrete) has excellent mechanical properties, and the stress performance of the component is 7-11 times higher than that of common concrete, so that the design of light and thin design (the thickness can be less than 10 mm) can be realized. The durability is extremely outstanding, the chemical resistance is extremely high, and the corrosion of acid and alkali and salt can be effectively resisted. The freeze-thaw cycle is strong (freeze rating F300), maintaining structural stability even in extreme climates. The external wall panel prepared by UHPC can realize large-amplitude and thin section, effectively reduce the dead weight of the structure, remarkably improve the impact resistance, weather resistance and service life of the external wall, and has great application potential. However, if UHPC is used as a single veneer or a load-bearing panel, it is difficult to integrate other building physical functions such as heat insulation and sound insulation. How to combine the advantages of UHPC panels with the versatility required by the building and solve the problem of efficient, reliable and convenient construction connection between the UHPC panels and the main body structure is a key challenge for successfully applying the UHPC panels to high-performance composite outer wall systems. The existing prefabricated sandwich wall board or partial curtain wall system still has room for improvement in the aspects of protection of functional layers, reliability of connection nodes, realization of integrated cooperative work of structures and enclosures, and the like. For example, the functional layer is easily damaged in the transportation and installation process, the connection node may become a thermal bridge or weak link, and the field wet operation affects quality and efficiency. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a composite outer wall based on a UHPC panel and a technical scheme of a construction method thereof, which can not only connect the UHPC panel with a steel beam through a steel keel frame to realize cooperative stress, so that the structural stability and the function are integrally and doubly improved, but also have the excellent heat insulation and fire resistance of the high strength, high weather resistance, low carbon and environmental protection of the UHPC and the core plate, realize the excellent performances of light weight, high strength, fire prevention, heat preservation, durability and maintenance free of the composite outer wall, be applicable to the building outer wall with strict requirements on the performance and have wide application prospect. In order to solve the technical problems, the invention adopts the following technical scheme: The composite outer wall based on the UHPC panel comprises an outer wall main body, wherein the outer wall main body is connected between a steel beam and a steel column; The method is characterized in that: The outer wall main body is formed by com