Sound insulation between upstairs and downstairs of glass curtain wall

The reason why there is no room between the upstairs and downstairs of the glass curtain wall and the upstairs and downstairs of the sound insulation glass curtain wall is because the floor of each floor is not in contact with the curtain wall, but there is a certain gap. So as long as these gaps are sealed tightly, the sound insulation effect can be achieved.

Generally, styrofoam is used to plug these gaps, but the sound insulation effect is not obvious because the density of styrofoam is extremely small and light.

When solving this kind of problems, the acoustic engineers of Silent Treasure will pack high-density sound-absorbing cotton with Silent Treasure sound-absorbing felt to plug these gaps. The sound insulation effect of this method is much higher than that of styrofoam, which can not only meet the needs of privacy, but also avoid noise interference.

The external wall is a glass curtain wall. How to soundproof the wall between two rooms 1 Gypsum board can be used for partition, for example, a layer of silent sound insulation felt can be added between them, which can better absorb sound waves.

2. It can also be considered to add sound-absorbing cotton between gypsum board and keel. This kind of structure is more stable and can surpass the general brick body.

Make a display screen on the glass curtain wall. What should be used to fill the gap between the glass curtain wall and the display screen? The display frame slightly protrudes from the glass curtain wall, and the gap between the display frame and the glass curtain wall is less than 10. If it is mm, it can be sealed with silicone weather-resistant adhesive. If the gap is too large, it is recommended to fill it with styrofoam first, and then smooth it with silicone weather-resistant adhesive after the styrofoam dries.

What glue is used between the glass curtain wall and the glass? Weathering structural sealant.

The distance between the glass curtain wall and the floor partition is generally 80- 120mm, and the thickness of the civil second floor from the top of the first floor to the ground is 80- 120mm if it is a structural surface (not decorated) and 130mm-200mm if it is a building surface (after decoration).

How much is the last sound insulation glass curtain wall in expressway? According to the square ~ there must be sound insulation pit wind, etc. Considering the difficulty of construction. , it's estimated to be only 500 yuan ~ this is still ordinary ~ ~ ~

The gap between the glass curtain wall and the ground exceeds 1 m wide. How to deal with various treatment methods: give a few examples.

1.5mm galvanized sheet+fireproof rock wool+1.5mm galvanized sheet sealing repair.

4 mm aluminum-plastic plate

2.5 or 3 mm aluminum veneer

10mm calcium silicate board

If it is built-in processing, it is generally willing to use joinery boards and the like.

Glass curtain walls with auxiliary frames always need other components to fix the glass. Hidden frame curtain wall is a subframe-glass is attached to the subframe with structural adhesive, and the subframe is connected with the main frame through components. From the outside, all the window frames are hidden behind the glass, so it is called hidden frame curtain wall. There must be no fewer auxiliary frames.

Glass curtain wall technology? Implementation standard: Technical Specification for Glass Curtain Wall Engineering (JJ102-2003)

The new Technical Code for Glass Curtain Wall Engineering (JGJ 102-2003) has been issued and will be implemented on June 65438+1 October12004. Compared with the original standard JJ102-96, many contents have been modified and added. Here is a brief introduction to its design.

The 2003 version first distinguishes between mandatory provisions and general provisions. Mandatory provisions are printed in bold, and "should" and "must" are adopted accordingly; The strictest qualifiers such as "should not" and "forbidden". Mandatory provisions should be implemented.

The content of non-mandatory clauses allows Party A and Party B to make other special agreements in the contract signed by both parties.

Introduction to the regulation of structural design service life;

The building structure has a specified design service life. In this revision, considering that the curtain wall belongs to the replaceable envelope structure, Chapter 12 of the code puts forward the design service life of the curtain wall structure, and points out in the explanation that the service life is generally not less than 25 years. Glass, aluminum profiles and steel can reach a service life of 25 years. The 10 year quality guarantee issued by structural adhesive is only a commercial measure, not the actual service life of structural adhesive. There have been cases abroad in which structural adhesive still works well for more than 30 years. From the aging test of structural adhesive, it can be seen that the service life of structural adhesive is possible to reach 25 years, and some domestic structural adhesive manufacturers have considered publishing the document of 25-year service life.

Terms and symbols:

(A) a clearer concept of curtain wall

In recent years, there are various forms of glass curtain wall, and new systems emerge one after another. The definition of curtain wall in the original specification has not adapted to the current trend of curtain wall diversification. Therefore, when the 2003 edition was revised, several characteristics of curtain wall were specified:

1, composed of supporting structure system and panel;

2. It has a certain displacement ability relative to the main structure;

3, do not share the load and function of the main structure.

Moreover, the glass curtain wall can be used as a decorative structure in addition to the peripheral protection structure.

(b) More detailed classification of curtain walls

1. Curtain wall refers to the wall with an inclination angle of 75 ~115 with the ground. The vertical curtain wall is a general curtain wall, and the rest are inclined curtain walls (inclination angle 75 ~ 90, inclination angle 90 ~115). Outside this range, they are collectively called lighting roofs, awnings and so on. , and according to the standard division of labor, not subject to the management of this specification.

2, glass curtain wall according to its structure type is divided into:

Frame supporting glass curtain wall;

All-glass curtain wall;

Point-supported glass curtain wall;

Among them, the frame-supported glass curtain wall can be divided into: open frame, hidden frame and semi-hidden frame curtain wall; According to its construction and installation methods, it can be divided into component curtain wall and unit curtain wall. Some manufacturers call the small unit curtain wall, whose glass plate has hooks and is installed on site in a single piece. In fact, it is a component curtain wall, which is not classified separately.

Materials:

(1) General provisions

The general rules have made new provisions on the surface treatment of metal materials. In addition to hot-dip galvanizing, inorganic zinc-rich coatings or other effective anti-corrosion measures (such as polyurethane coatings and fluorocarbon spraying) can also be used for steel profiles. Besides anodic oxidation, electrophoretic coating, powder spraying or fluorocarbon spraying can also be used for aluminum profiles.

(2) Aluminum alloy profiles

1. The models of aluminum alloy profiles are internationally accepted: 606 1, 6063, 6063A, etc.

2. The stipulation of heat-insulating aluminum profile was added, and it was emphasized that nylon 66 should be used as heat-insulating strip.

3. The thickness requirements of treatment layers for various surface treatments are given (Table 3.2.2 in the specification).

(3) Steel profiles

1, adding new steel products, such as weather-resistant structural steel and steel strand.

2. Provisions on supporting devices (hanging clips, steel claws, etc.). ) and anchor toughness in tension cables have been added.

3. The requirements of fluorocarbon spraying and polyurethane spraying on the thickness of surface treatment layer are specified in detail.

(4) glass

1. The variety of glass used for curtain wall was adjusted, and the wire-sandwiched glass was cancelled; Low-emissivity glass, fireproof glass and glazed glass were added.

2. Emphasize the secondary heat treatment, chamfering and edging process after tempering to reduce the self-explosion of glass.

3. The application of fireproof glass is clearly defined, and the use of single fireproof glass and its products is emphasized.

Architectural design:

(a) the opening area of the fan.

Considering energy saving, personal protection and the safety of the fan itself, the original code stipulates that the total area of the fan should not be greater than 15% of the wall area.

After SARS, it is generally required to strengthen natural ventilation and turn on fans. Therefore, this revision cancels the regulation of the maximum area of the opening fan, and the setting of the opening fan is determined by the architectural design according to the use requirements.

(2) controlling the reflectivity of reflective glass

Sun-controlled coated glass and low-emissivity glass both reflect sunlight, with high reflectivity and strong reflected light, which is easy to cause surrounding light reflection interference. Therefore, in the chapter of architectural design, it is stipulated that the reflectivity of glass should not be greater than 0.3.

(3) About the use of safety glass

Safety glass refers to laminated glass, tempered glass and tempered glass products. The use of safety glass should not only ensure the safety of personnel to the maximum extent, but also consider the limitation of the maximum processing size of tempered glass and laminated glass. The 2003 revision stipulates that:

1. Supporting curtain wall: safety glass shall be used;

2. Glass curtain wall: the glass rib should not be made of single piece of tempered glass, and the glass rib should be made of tempered laminated glass;

3. Point-supported curtain wall: the panel is made of tempered glass and its products, and the glass ribs are made of tempered laminated glass.

At present, some projects of frame-supported curtain wall use semi-tempered glass, which is not safety glass, so it is stipulated that "safety glass should be used". The glass rib of all-glass curtain wall is an important supporting structure. If a single piece of tempered glass is used, once it is broken due to spontaneous explosion or impact, the face glass will lose its support and collapse, seriously affecting safety. On the other hand, because the interlayer and tempered glass are limited by the maximum processing size of the current equipment, the high all-glass curtain wall can only use large-size float glass, so it is not stipulated that the all-glass curtain wall must use safety glass.

At present, in some projects, especially in large public buildings and high-rise buildings, all curtain walls adopt laminated glass. Although the personal injury caused by the falling of broken glass is avoided, once a fire breaks out, firefighters will not be able to enter the room for rescue, nor will they be able to help indoor personnel escape, resulting in new security risks. Therefore, when using laminated glass, it is necessary to set aside emergency and escape exits made of tempered glass and set up obvious indication signs.

(D) the application of fire glass

1, the fire-proof glass of curtain wall should use a single piece of fire-proof glass and its products. At present, the most widely used is single cesium potassium glass and its products. Composite glass filled with fire-retardant liquid should not be used.

2, the following parts of the curtain wall should use fire glass:

Transparent sandwich smoke plug;

Vertical transparent fire belts on the left and right sides of the firewall;

Transparent horizontal fire zones on the upper and lower sides of the floor when there is no solid wall under the window or the height of the solid wall is insufficient;

A transparent firewall used for dividing the fireproof separation groove;

Other transparent fireproof partitions and transparent floors.

3. The facilities or supporting structures supporting fire-proof glass should not adopt aluminum structure, but steel structure.

Basic provisions of structural design:

The original structural design chapter is subdivided into four chapters: basic provisions, structural design of frame-supported curtain wall, all-glass curtain wall and point-supported curtain wall.

This chapter mainly describes the similarities and differences of various glass curtain wall structural designs, including general rules; Mechanical efficiency of materials; Load and action; Effect combination; Connection design; Design of silicone structural adhesive.

(1) General provisions

1, which changed the original specification that curtain wall columns should be hung on the main structure. The original regulations were formulated according to the situation that the curtain wall was supported by the frame at that time. At present, many large-span and complex supporting steel structures are supported on the main structure at the lower end, and the cable-strut system is tensioned on the main structure, so it is impossible to adopt the form of suspension support. Therefore, in the sixth chapter, the provision that the frame-supported curtain wall should adopt hanging columns is added.

2. The original code requires that the column and the main structure should be connected flexibly. This concept is not clear, and how to calculate flexible active connection is easy to cause controversy. This specification stipulates that the curtain wall should have a certain displacement capacity relative to the main structure, which can be realized by various glue joints and gaps, various oblong holes, sliding joints of upper and lower columns, gaps of upper and lower columns and gaps of left and right beams. Long-span steel structures can also fully meet the requirements of large displacement through articulated rocker arm mechanism and spring mechanism. Therefore, in this revision, it is no longer emphasized that every connection must be connected by bolts, and it is not excluded that some connections are welded.

In the actual glass curtain wall engineering, many of them are welded by local connection (including the welding of column angle code and embedded parts), and some of them have been attacked by typhoon 12 for many times; The welded curtain wall is still safe after many shaking table tests of more than 9 degrees. Practice shows that it is unreasonable to completely prohibit welding in curtain wall connection, which is often difficult to do in some occasions. Specific projects should be analyzed in detail.

3. The load and action to be considered are defined, and the calculation of temperature stress is cancelled.

The revised article cancels the calculation of temperature stress. From the engineering design in recent years, after meeting the requirements of assembly gap structure and joint width, the temperature stress generally does not play a controlling role, so it is not calculated to simplify the design.

4. The importance coefficient and the seismic adjustment coefficient of bearing capacity are introduced, which are the basic coefficients of structural design to adjust the safety of structural design, and are used for the combination without seismic effect and the combination with seismic effect. In order to keep consistent with the expression of structural design code, this code introduces these two coefficients into the general expressions of internal force and stress control. In the design of glass curtain wall, these two coefficients should be 1.0, which will not increase the design workload.

5. Check and control the deflection in all directions respectively.

Generally, the wind load and self-weight in glass curtain wall act in different directions, so the seismic force is very small. Therefore, for the deflection control that does not affect the safety of the structure, the standard values of wind load and permanent load are controlled respectively. When the beam is stressed in two directions, the deflection is controlled in the horizontal and vertical directions respectively. As envelope and decorative structure, this control can not only meet the use requirements, but also simplify the design workload.

6. It is suggested to consider the torsional influence caused by eccentric load.

On the beam of frame-supported curtain wall, eccentric application of glass gravity will cause beam distortion. When insulating glass or laminated glass is used or the eccentricity is large, the beam will be subjected to large torque, which should be considered in the design.

(2) Mechanical efficiency of materials

1, the strength design value of glass is divided into three grades, and the strength design value of glass in the original specification is divided into two grades according to its thickness. Because the grade difference is too big, the unreasonable phenomenon of bearing capacity reduction will occur after the glass is thickened. Now the strength design value is divided into three grades according to the thickness, which can avoid this situation as much as possible.

2. Define the concept of glass side strength. Side surface refers to the cross section formed by glass cutting, and its width is equal to the thickness of glass. The lateral strength is lower than the large plane strength, which is often used to calculate the tensile bearing capacity of glass in the plane and the bending bearing capacity of glass ribs produced by bolts or other connectors.

3. The method of obtaining the design value of stainless steel strength is given, which is obtained by dividing the yield strength by the coefficient 1. 15.

4. In the cable-stayed structure, the pull rod and the cable are in tension for a long time, so it is appropriate to have a high degree of safety. The design value of tie rod strength is the yield strength divided by the coefficient 1.4; The strength design value of stay cables is obtained by dividing the tensile strength by the coefficient 1.8.

5. The strength design values of weathering steel and bolts, welds and rivets are listed in the appendix.

(3) Load and earthquake action

1, and the wind load is calculated according to Code for Load of Building Structures (GB50009). The basic wind pressure is based on a 50-year return period. For curtain walls with a height of more than 200m, complicated shape and complicated wind environment, wind tunnel tests should be conducted to determine the wind load value.

2. When calculating earthquake action, the dynamic coefficient is 5.0. And the seismic coefficients of two ground acceleration levels (corresponding to the intensities of 7.5 degrees and 8.5 degrees) increase.

(D) the combination of load and effect

1, and the partial coefficient of gravity load is generally 1.2. When the gravity load effect is favorable (the combination of axial pressure caused by self-weight and tensile stress caused by wind load when the glass rib at the lower end is bent), take1.0; When the gravity load effect plays a controlling role (such as the combination of self-weight and wind load of the compressed steel column supported at the lower end), it should still be considered as the combination of 1.35, and the combination coefficient of the corresponding wind load is 0.6.

2. The combination coefficient of earthquake action effect is 0.5.

3. When checking the deflection of curtain wall components, only check the deflection value under the action of wind load standard value or gravity load standard value, and do not combine them (when checking the canopy and lighting roof components, the interaction between wind load and self-weight should be considered, but this is beyond the scope of this specification).

(5) Connection design

1. Connection requires embedded parts. Embedded steel plates and embedded grooves shall be put in and fixed before concrete pouring. The design method of embedded steel plate is listed in the appendix.

2. When there is no condition to use embedded parts, anchor bolts can be used to fix the connectors. Mechanical anchor bolt or chemical anchor bolt should be used after adding anchor bolt, and the matters needing attention when adding anchor bolt after application are put forward.

3. The out-of-plane bearing capacity of masonry wall is low, and it is difficult to fix connectors. Therefore, the requirements of adding steel or concrete connecting beams and columns are made in the provisions.

(6) sealant

1. The design formula of structural sealant bearing capacity adopts the strength design value, which is consistent with the design expressions of other parts.

2. When calculating the thickness of sealant, the displacement bearing capacity is specified, and the stress elongation of 0. 14MPa can be obtained from the stress-strain curve provided by the manufacturer. The displacement of the glass panel is taken as the maximum interlayer displacement angle under wind load (at this time, the glue joint stress will not exceed 0. 14MPa). If necessary, the influence of temperature should also be considered.

Design of frame-supported curtain wall;

(A) glass panel design

1, adding the provisions on the minimum thickness and maximum thickness difference between the front and rear glass sheets of insulating glass and laminated glass.

2. In the calculation of stress and deflection of glass, the working state of large deflection of glass is considered, and the calculated value is reduced, and the reduction coefficient is introduced.

3. The deflection limit is defined as 1/60 of the short side length. Because the deflection of curtain wall glass is mainly caused by wind load, the standard value of wind load can be used to calculate the deflection.

4. The calculation methods of laminated glass and insulating glass are given. The relevant provisions on the equivalent thickness of laminated glass and insulating glass in the original specification are only applicable to the special case of two pieces of glass with the same thickness and model. In general, the external load on two pieces of glass should be distributed in proportion to their stiffness d, that is, in proportion to or. Considering the difference of deflection between the front and rear glass in insulating glass, the load distributed by the front glass directly subjected to wind load increases by 10%.

(2) Design of beam

1. Requirements for reasonably specifying the minimum thickness of beam section. The minimum thickness of the main stressed part of the section is determined by three conditions: width-thickness ratio b/t; Plate; When thread is used for direct stress connection, the area thickness of aluminum profile is not less than the diameter of screw; When the span of aluminum profile is not more than 1.2m, the minimum is 2mm；; When the span is greater than 1.2m, the minimum value is 2.5mm.. The minimum wall thickness of steel profile is 2.5 mm.

Sections that do not meet the above requirements will not be considered in the section design.

2. It is suggested that the beam should be designed according to bending and shearing. When the beam adopts open section, the influence of restrained torsion of thin-walled bar should also be considered, and torsion calculation should be carried out if necessary.

3. The absolute deflection limit of the beam was cancelled in the original code. The initial restrictions apply to small-span beams. At present, there are various forms of curtain walls and the span of beams varies greatly, so it is sometimes unreasonable to adopt a single numerical limit. Using relative deflection control conforms to the general habit of structural design. Therefore, this revision will control the deflection of aluminum alloy profiles at1180 of the span; Steel profiles are controlled to span 1/250.

(3) column design

1, the control principle of minimum thickness of column section is similar to that of beam. The width-thickness ratio of the plate and the area thickness of the aluminum profile threaded connection line are the same as those of the beam. The difference is that the minimum wall thickness of the opening part of aluminum profile is 3mm, and the minimum wall thickness of the box part is 2.5mm；; The minimum wall thickness of steel profile is 3mm.

How about glass curtain wall insulation? The insulation effect of glass curtain wall is quite good.