Asbestos-free calcium silicate board curtain wall dry hanging system and construction method

Abstract

The application discloses an asbestos-free calcium silicate board curtain wall dry hanging system and a construction method, wherein back hanging pieces, plate joint hanging pieces and external corner hanging pieces are arranged, the asbestos-free calcium silicate board at the external corner position can be effectively fixed and installed by using the external corner hanging piece, a sealing piece is installed after the whole wall surface construction is completed, the sealing body is pressed by a waste steel bar head (ball head structure) on site, the sealing body is bent and deformed to drive the connecting claws at two ends into corresponding hooking grooves, the connecting claws entering the hooking grooves are reversely locked to form a waterproof structure, the slide plate and the limiting plate are unidirectionally locked and fixed by the unidirectional ratchet to avoid resetting, and finally weather-resistant glue is filled in the outer side, so that the structural strength and stability of the whole curtain wall dry hanging system are ensured.

Description

Technical Field

[0001] This invention relates to the technical field of building construction, specifically to a dry-hanging system and construction method for asbestos-free calcium silicate board curtain walls. Background Technology

[0002] A building curtain wall consists of decorative panels and a keel structure connected by hangers. It is fixed to the exterior of the building using anchor bolts or embedded parts and anchor plates. It plays a role in energy conservation, prevents the main structure from being exposed to wind, sun and rain, protects the main structure, and thus extends the service life of the building. The curtain wall installed on the exterior of the building also enhances the aesthetics of the building's facade.

[0003] In recent years, new building materials have developed rapidly, and the variety of curtain wall panels has also been increasing. In order to reduce the over-exploitation of mountains, a large number of curtain wall materials that can replace stone have been developed in recent years. Asbestos-free calcium silicate board cladding is one of them, and it has also developed rapidly in recent years.

[0004] Asbestos-free calcium silicate board veneer panels are durable, lightweight, energy-saving, environmentally friendly, available in a variety of colors, and feature realistic marble-like patterns. The dry-hanging system is easy and quick to assemble, and the resulting structure is safe, reliable, strong, and aesthetically pleasing.

[0005] When finishing the corners of existing asbestos-free calcium silicate board curtain walls, the two sides of the asbestos-free calcium silicate board are usually ground to a 45° angle using a cutting machine and then joined together. During the joining process, the gaps are filled with joint sealant. However, this design only has one limiting surface, which makes it difficult to join together and has poor practicality. After the curtain wall panels are installed, the firmness of the curtain wall panels at the external corners is poor, which poses certain safety hazards. Summary of the Invention

[0006] The technical problem to be solved by this invention is that when finishing the corners of existing asbestos-free calcium silicate board curtain walls, the two sides of the asbestos-free calcium silicate board are generally ground to a 45° angle and then joined together. During the joining, the gap is filled with joint sealant. However, this design only has one limiting surface, which is not easy to join and has poor practicality. After the curtain wall panel is installed, the firmness of the curtain wall panel at the corner is poor, which poses certain safety hazards.

[0007] To solve the above-mentioned technical problems, the inventors, through practice and summarization, derived the technical solution of this invention, which adopts the following technical solution:

[0008] A dry-hanging system for asbestos-free calcium silicate board curtain walls includes:

[0009] Concrete structure;

[0010] Anchor plates are fixed to the concrete structure by anchor bolts;

[0011] The keel system consists of a main keel and a secondary keel, which are fixed together and installed with anchor plates via special conversion parts, external corner conversion parts and anchor plates;

[0012] Corner brackets are fixedly installed on the keel system using machine bolts;

[0013] The hanger, installed on the corner bracket by fastening bolts, includes:

[0014] Back hook, suitable for hooking onto the back of asbestos-free calcium silicate board;

[0015] The board seam hanger is suitable for hooking onto the seam between two adjacent asbestos-free calcium silicate boards.

[0016] External corner brackets, suitable for installation on the side of asbestos-free calcium silicate boards;

[0017] The corner bracket includes a connecting base plate, a second support plate, a first support plate, and a reinforcing rib. The connecting base plate is fixed to the corner bracket by fastening bolts. The connecting base plate has an L-shaped structure. The first support plate and the second support plate are arranged at 90°. The reinforcing rib is fixedly arranged at the bottom of the connecting base plate and is located on the same side as the first support plate. The side of the connecting base plate where the second support plate is arranged and the side of the reinforcing rib near the first support plate are both limiting surfaces. Both the first support plate and the second support plate are suitable for fixing asbestos-free calcium silicate boards.

[0018] In a preferred embodiment, the connecting base plate, the plate seam hanger, and the back hanger are all provided with long bolt holes along their length for adjusting the movement of the fastening bolts.

[0019] In a preferred embodiment, both the first and second support plates are provided with hooks on the side away from the connecting base plate. The hooks are adapted to fix the asbestos-free calcium silicate board together with the limiting surface. The side of the asbestos-free calcium silicate board is provided with a groove, which is adapted to fit the hooks.

[0020] In a preferred embodiment, the board seam hanger includes a first limiting plate, a second limiting plate, and a connecting plate. The connecting plate is adapted to have long bolt holes. Both the first limiting plate and the second limiting plate are provided with two sets symmetrically arranged on both sides of the connecting plate. The first limiting plate is located on the back of the asbestos-free calcium silicate board and its width is greater than that of the second limiting plate. The side of the asbestos-free calcium silicate board is provided with a second groove, which is adapted to install the second limiting plate and the sealing element.

[0021] In a preferred embodiment, the inside of the second slot is provided with a hook groove, and the sealing element includes a sealing body installed inside two sets of hook grooves at the plate seam. The front end of the sealing body is provided with a connecting claw, and the back of the sealing body is provided with two symmetrically arranged sliding plates. An elastic body is connected between the two ends of the two sets of sliding plates, and a one-way ratchet is provided between the sliding plate and the second limiting plate.

[0022] In a preferred embodiment, the front side of the sealing body is an arched rubber sheet.

[0023] In a preferred embodiment, the width of the second limiting plate is 1 / 2 to 3 / 4 of the width of the first limiting plate.

[0024] In a preferred embodiment, the width of the hook is 1 / 3 to 1 / 2 of the length of the tray.

[0025] A construction method for a dry-hanging system of calcium silicate board curtain wall without asbestos includes the following steps:

[0026] Step 1: Concrete Structure Treatment

[0027] Clean up any residual mortar and loose concrete on the surface of the base wall. If there are hollow areas, cracks, or peeling on the base, cut it open with a grinding wheel cutter, clean it thoroughly, and after cleaning down to the original base, moisten it with water and then level it in layers with cement mortar.

[0028] Step 2: Set up the baseline

[0029] Measure the outdoor one-meter line for each building, draw the window elevation line for each floor based on the one-meter line, and check it. Before the curtain wall construction, the vertical flatness of the building's exterior wall should be measured. Based on the measurement results of the exterior wall's vertical flatness, determine the reference surface of the main and secondary keels of the curtain wall. The measurement and positioning of the curtain wall should be combined with the measurement and positioning of the frame concrete main structure. Measure the control lines on the exterior wall facade to control the verticality and flatness of the curtain wall. Then, locate the position of each vertical keel according to the curtain wall keel layout drawing and the detailed construction drawings. Mark the position of the post-installed anchor plate according to the positioning dimensions of the main keel.

[0030] Step 3: Positioning of post-embedded parts

[0031] Make a paper anchor plate with the same shape and specifications as the post-installed anchor plate. Mark the center lines in both the longitudinal and transverse directions on the paper anchor plate. Attach the paper anchor plate to the wall so that the marked longitudinal and transverse center lines are aligned with the positioning lines of each vertical keel. Make the drilling range for chemical anchor bolts at the four installation hole locations. The size of all the long holes of the anchor plate should be marked on the wall to prevent the drilling position from being adjusted when encountering steel bars during the drilling process later.

[0032] Step 4: Anchor Bolt Installation

[0033] Drill holes using an impact drill according to the marked points of the post-installed embedded parts. Drill holes in concrete frame columns or frame beams using an electric drill. Mark the intended drilling depth on the drill bit. After drilling, use an air compressor to blow away the powder in the hole. The dust in the hole should be blown away. Put the matching chemical agent into the hole in the correct direction. Use a power tool to rotate the screw into the hole. Do not use a hammer to force the bolt into the hole.

[0034] Once the swivel bolt has been inserted to the bottom of the hole or the required anchoring depth, stop rotating immediately, remove the power tool, and do not disturb the anchor bolt before the chemical agent has fully cured. The next construction process can only be carried out after the anchor bolt has been allowed to cure and reach its strength.

[0035] Step 5: Pull-out test;

[0036] The safety of the curtain wall depends on the anchoring strength of the chemical anchors. Whether the anchoring strength of the chemical anchors meets the design and specification requirements must be verified by on-site pull-out test. Once the on-site pull-out test is passed, the anchor plate can be installed.

[0037] Step 6: Install the main keel

[0038] According to the design spacing in the drawings, combined with the anchor bolt opening spacing of the conversion parts, the required opening positions of the anchor bolt connection points of the main keel are located and marked. Then, the anchor bolt installation holes are drilled using a bench drill. First, the vertical main keels at both ends of the exterior wall are installed. After the main keels are in place, they are connected to the special conversion parts through anchor bolts. The position of the vertical main keels is determined according to the vertical and horizontal flatness control lines of the curtain wall to ensure that the spacing and vertical flatness of the vertical main keels meet the specifications. After the vertical main keels at both ends of the exterior wall are installed, when installing the middle vertical keel, control lines are drawn with the two vertical main keels as reference surfaces as needed to adjust the vertical flatness of the middle vertical keel. The keels are installed one by one from bottom to top. Expansion joints are left at the ends of the upper and lower main keels according to the design requirements in the drawings. The upper and lower keels at the expansion joints are connected with core sleeves to meet the lightning protection requirements. The upper and lower keels are connected by braided copper wires at the expansion joints.

[0039] Step 7: Secondary keel installation

[0040] After the main keel is installed, according to the horizontal installation control line, and based on the keel height and width and the width of the horizontal joint of the asbestos-free calcium silicate board designed in the drawings, the installation positioning lines of each row of horizontal secondary keels are marked on the main keel. Each row of positioning lines must be closed around the perimeter of the building. Only after the lines are checked and confirmed to be correct can the horizontal secondary keels be welded. Align the secondary keels with the installation positioning lines, spot weld them for temporary fixation, check the position for accuracy, use a spirit level to check and adjust the flatness, and after the inspection is qualified, perform full welding for fixation.

[0041] Step 8: Concealed Inspection

[0042] After all the main and secondary keels are installed, a concealed inspection of the keels must be carried out together with the supervisor and the construction unit. After the inspection is passed, the hangers and calcium silicate boards will be installed.

[0043] Step 9: Install the mounting bracket

[0044] The corner brackets and special hangers are custom-made in the factory according to the design requirements of the drawings. They are fixed to the main keel and secondary keel with machine bolts. The bolt holes of the hangers are long bolt holes, which are adjustable installation holes. The back hangers, board seam hangers, external corner hangers and corner brackets are connected and combined with fastening bolts to form a kit, which is convenient for later on-site installation. The fixing bolts connecting the back hangers, board seam hangers, external corner hangers and corner brackets are not tightened at first. They are tightened after the asbestos-free calcium silicate board is installed and the flatness is corrected to meet the requirements.

[0045] Step 10: Installation of asbestos-free calcium silicate boards

[0046] Asbestos-free calcium silicate boards are installed row by row from bottom to top. Each row begins at one corner on one side and proceeds to the other. The distance between the hangers should be at least 100mm from the corner of the board. The spacing between each hanger should be 300-600mm, with at least four hangers per board. A 15-18mm gap should be left between the asbestos-free calcium silicate boards. Insert the first asbestos-free calcium silicate board into the groove of the back hanger, fasten the horizontal board seam hanger, roughly adjust the position, and initially tighten the bolts. Adjust the two back hangers of the top row along the vertical wall direction according to the flatness control line. First, move the asbestos-free calcium silicate board left and right according to the vertical seam straightness control line to align the edge of the board with the control line. Then, fasten the vertical seam hanger. After the flatness of the asbestos-free calcium silicate board meets the requirements, tighten all the fastening anchors on the seam hanger. Install the remaining asbestos-free calcium silicate boards in sequence according to the above steps. Move the vertical seam of the board being installed left and right to adjust it, avoiding excessive force that may cause the adjacent boards to shift. Correct the deviation using the set control line. After the correction is completed, fasten the vertical seam hanger. During the installation process, use a 2m straightedge to frequently check the flatness of the installed board surface.

[0047] The surface and seams of the asbestos-free calcium silicate board are cleaned, and the sealing element is installed. The back of the sealing body is filled into the seam of the board by the side facing the second limiting plate. The sealing body is then squeezed by the front of the on-site steel bar head, which has a spherical end. The sealing body bends and deforms, causing the connecting claws at both ends to enter the corresponding hook grooves. The connecting claws are locked in the opposite direction in the hook grooves to form a waterproof structure. The sliding plate and the second limiting plate are fixed by a one-way ratchet to prevent resetting.

[0048] Step 11: Apply weather-resistant sealant

[0049] According to the requirements of the board joint width, paper tape is applied to both sides of the board joint. When applying sealant, first use a caulking gun to evenly apply an appropriate amount of weather-resistant sealant to the inside of the board joint sealant. The overlap width with the decorative board surface should not be less than 1mm to ensure a complete and tight seal. After applying the sealant, the paper tape should be removed. The paper tape should not be left on the board surface for more than 2 hours to avoid damaging the decorative layer of the board surface.

[0050] Step 12: Clean the surface of the asbestos-free calcium silicate board.

[0051] The surface of the board should be cleaned only after the weather-resistant adhesive has cured. First, clean the dust and dirt from the edges of the non-asbestos calcium silicate board. For decorative boards with a protective film, the surface of the decorative board should not be damaged during the process of removing the protective film.

[0052] Compared with the prior art, the present invention has the following beneficial effects:

[0053] By setting up back hangers, panel joint hangers, and external corner hangers, the external corner hangers can effectively fix and install the asbestos-free calcium silicate board at the external corner. After the entire wall construction is completed, the sealing element is installed. The sealing body is pressurized by the scrap steel bar ends (ball head structure) on site. The sealing body bends and deforms, causing the connecting claws at both ends to enter the corresponding hook grooves. The connecting claws are locked in the opposite direction in the hook grooves to form a waterproof structure. The sliding plate and the limiting plate are fixed by a one-way ratchet to prevent repositioning. Finally, weather-resistant sealant is filled on the outside to ensure the structural strength and stability of the entire curtain wall dry-hanging system. Attached Figure Description

[0054] Figure 1 This is a top view of an asbestos-free calcium silicate board curtain wall dry-hanging system and its construction method according to the present invention.

[0055] Figure 2 This is a partial enlarged view of the external corner of the asbestos-free calcium silicate board curtain wall dry-hanging system and its construction method according to the present invention.

[0056] Figure 3 This is a schematic diagram of the external corner bracket of the asbestos-free calcium silicate board curtain wall dry-hanging system and its construction method according to the present invention;

[0057] Figure 4 This is a detailed drawing of the panel joint hanger and the installation node of the asbestos-free calcium silicate board curtain wall dry hanging system and its construction method according to the present invention.

[0058] Figure 5 This is an enlarged view of the panel joint hanger and the installation node of the asbestos-free calcium silicate board curtain wall dry hanging system and its construction method according to the present invention.

[0059] Figure 6 This is an enlarged view of the installation node of the sealing element at the joint of the asbestos-free calcium silicate board curtain wall dry-hanging system and its construction method according to the present invention.

[0060] The corresponding labels and names in the attached figures are as follows:

[0061] 1. Asbestos-free calcium silicate board; 2. Backrest bracket; 3. Corner bracket; 4. Main keel; 5. Secondary keel; 6. Machine bolt; 7. Converter; 8. Anchor bolt; 9. Bracket fixing bolt; 10. Keel and converter connecting bolt; 11. Anchor plate; 12. Insulation layer; 13. Concrete structure; 14. External corner bracket; 141. Connecting base plate; 142. Support plate one; 143. Support plate two; 144. Reinforcing rib; 145. Long bolt hole; 15. Curtain wall bottom bracket; 16. External corner converter; 17. Board seam bracket; 171. Limiting plate one; 172. Limiting plate two; 173. Connecting plate; 174. Groove two; 18. Sealing element; 181. Sealing body; 182. Connecting claw; 183. Slide plate; 184. Elastomer; 185. One-way ratchet. Detailed Implementation

[0062] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0063] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0064] Example 1, as Figures 1 to 6 As shown, an asbestos-free calcium silicate board curtain wall dry-hanging system includes:

[0065] 13. Concrete structure;

[0066] Anchor plate 11 is fixed to concrete structure 13 by anchor bolts 8;

[0067] The keel system consists of a main keel 4 and a secondary keel 5, which are fixed together and installed with a special conversion part 7, an external corner conversion part 16 and an anchor plate 11.

[0068] Corner bracket 3 is fixedly installed on the keel system by machine bolt 6;

[0069] The hanger, fastened to the corner bracket 3 by bolt 9, includes:

[0070] Back hanger 2, suitable for hooking onto the back of asbestos-free calcium silicate board 1;

[0071] The board seam hanger 17 is suitable for hooking onto the seam between two adjacent asbestos-free calcium silicate boards 1;

[0072] External corner bracket 14, and suitable for installation on the side of asbestos-free calcium silicate board 1;

[0073] The corner bracket 14 includes a connecting base plate 141, a second support plate 143, a first support plate 142, and a reinforcing rib 144. The connecting base plate 141 is fixed to the corner bracket 3 by fastening bolts 9. The connecting base plate 141 has an L-shaped structure. The first support plate 142 and the second support plate 143 are arranged at 90°. The reinforcing rib 144 is fixedly arranged at the bottom of the connecting base plate 141 and is located on the same side as the first support plate 142. The side of the connecting base plate 141 where the second support plate 143 is arranged and the side of the reinforcing rib 144 near the first support plate 142 are both limiting surfaces. The first support plate 142 and the second support plate 143 are both suitable for fixing the asbestos-free calcium silicate board 1.

[0074] The connecting base plate 141, the panel seam hanger 17, and the back hanger 2 are all provided with elongated bolt holes 145 along their length for adjusting the fastening bolts 9. This facilitates adjustment of the panel surface along the direction perpendicular to the wall, ensuring the flatness and verticality of the panel surface.

[0075] The first tray 142 and the second tray 143 are provided with hooks on the side away from the connecting base plate 141. The hooks are suitable for fixing the asbestos-free calcium silicate board 1 together with the limiting surface. The side of the asbestos-free calcium silicate board 1 is provided with a groove, which is suitable for fitting the hooks.

[0076] The plate seam hanger 17 includes a first limiting plate 171, a second limiting plate 172, and a connecting plate 173. The connecting plate 173 is adapted to have a long bolt hole 145. The first limiting plate 171 and the second limiting plate 172 are each provided with two sets symmetrically arranged on both sides of the connecting plate 173. The first limiting plate 171 is located on the back of the asbestos-free calcium silicate board 1 and its width is greater than that of the second limiting plate 172. The side of the asbestos-free calcium silicate board 1 is provided with a second groove 174, which is adapted to install the second limiting plate 172 and the sealing element 18.

[0077] The groove 174 has a hook groove inside. The sealing element 18 includes two sets of sealing bodies 181 installed inside the hook grooves at the plate seam. The front end of the sealing body 181 is provided with a connecting claw 182. The back of the sealing body 181 is provided with two symmetrically arranged sliding plates 183. An elastic body 184 is connected between the two ends of the two sets of sliding plates 183. A one-way ratchet 185 is provided between the sliding plate 183 and the limiting plate 172.

[0078] The front side of the sealing body 181 is an arched rubber sheet.

[0079] The width of the second limiting plate 172 is 1 / 2 to 3 / 4 of the width of the first limiting plate 171.

[0080] The width of the hook is 1 / 3 to 1 / 2 of the length of the tray.

[0081] A construction method for a dry-hanging system of calcium silicate board curtain wall without asbestos includes the following steps:

[0082] Step 1, Treatment of Concrete Structure 13

[0083] Clean up any residual mortar and loose concrete on the surface of the base wall. If there are hollow areas, cracks, or peeling on the base, cut it open with a grinding wheel cutter, clean it thoroughly, and after cleaning down to the original base, moisten it with water and then level it in layers with cement mortar.

[0084] Step 2: Set up the baseline

[0085] Measure the outdoor one-meter line of each building, draw the window elevation line of each floor based on the one-meter line, and check it. Before the curtain wall construction, the vertical flatness of the building's exterior wall should be measured. Based on the measurement results of the exterior wall's vertical flatness, determine the reference surface of the main and secondary keels 5 of the curtain wall. The measurement and positioning of the curtain wall should be combined with the measurement and positioning of the frame concrete main structure. Measure the control lines for controlling the verticality and flatness of the curtain wall on the exterior wall facade. Then, locate the position of each vertical keel according to the curtain wall keel layout drawing and the detailed construction drawings. Mark the position of the post-installed anchor plate 11 according to the positioning dimensions of the main keel 4.

[0086] Step 3: Positioning of post-embedded parts

[0087] Make a paper anchor plate 11 with the same shape and specifications as the post-anchor plate 11. Mark the center lines in both the longitudinal and transverse directions on the paper anchor plate 11. Attach the paper anchor plate 11 to the wall so that the marked longitudinal and transverse center lines are aligned with the positioning lines of each vertical keel. Make the drilling range of chemical anchor bolts 8 at the four installation hole locations. The size of all the long holes of the anchor plate 11 should be marked on the wall to prevent the drilling position from being adjusted when encountering steel bars during the drilling process later.

[0088] Step 4, Install anchor bolt 8

[0089] Drill holes using an impact drill according to the marked points of the post-installed embedded parts. Drill holes in concrete frame columns or frame beams using an electric drill. Mark the intended drilling depth on the drill bit. After drilling, use an air compressor to blow away the powder in the hole. The dust in the hole should be blown away. Put the matching chemical agent into the hole in the correct direction. Use a power tool to rotate the screw into the hole. Do not use a hammer to force the bolt into the hole.

[0090] Once the rotatable bolt has been inserted to the bottom of the hole or the required anchoring depth, stop rotating immediately, remove the power tool, and do not disturb the anchor bolt 8 before the chemical agent has fully cured. The next construction process can only be carried out after the anchor bolt has been allowed to cure and reach the required strength.

[0091] Step 5: Pull-out test;

[0092] The safety of the curtain wall depends on the anchoring strength of the chemical anchor bolts 8. Whether the anchoring strength of the chemical bolts meets the design and specification requirements must be verified by on-site pull-out test. After the on-site pull-out test is qualified, the anchor plate 11 can be installed.

[0093] Step 6: Install the main keel 4

[0094] According to the design spacing of the anchor bolts 8 of the main keel 4, combined with the opening spacing of the anchor bolts 8 of the conversion piece, the required opening positions of the anchor bolts 8 of the main keel 4 are located and marked. Then, the anchor bolt 8 installation holes are drilled using a bench drill. First, the vertical main keels 4 at both ends of the exterior wall are installed. After the main keels 4 are in place, they are connected to the special conversion piece 7 through the anchor bolts 8. The position of the vertical main keel 4 is determined according to the vertical and horizontal flatness control lines of the curtain wall to ensure that the spacing and vertical flatness of the vertical main keels 4 meet the specifications. After the vertical main keels 4 at both ends of the exterior wall are installed, when installing the middle vertical keel, control lines are pulled with the two vertical main keels 4 at both ends as reference surfaces as needed to adjust the vertical flatness of the middle vertical keel. The keels are installed one by one from bottom to top. Expansion joints are left at the ends of the upper and lower main keels 4 according to the design requirements of the drawings. The upper and lower keels at the expansion joints are connected with core sleeves to meet the lightning protection requirements. The upper and lower keels are connected by braided copper wires at the expansion joints.

[0095] Step 7: Install secondary keel 5

[0096] After the main keel 4 is installed, according to the horizontal installation control line, and according to the design of the keel height and width and the width of the horizontal joint of the asbestos-free calcium silicate board 1, the installation positioning lines of each row of horizontal secondary keels 5 are marked on the main keel 4. Each row of positioning lines must be closed around the perimeter of the building. Only after the lines are checked and confirmed to be correct can the horizontal secondary keels 5 be welded. Align the secondary keels 5 with the installation positioning lines, spot weld them for temporary fixation, check the position for accuracy, use a spirit level to check and adjust the flatness, and after the inspection is qualified, perform full welding fixation.

[0097] Step 8: Concealed Inspection

[0098] After all the main and secondary keels are installed, the supervisor and the construction unit shall conduct a concealed inspection of the keels. After the inspection is passed, the hangers and calcium silicate boards shall be installed.

[0099] Step 9: Install the mounting bracket

[0100] The corner bracket 3 and the special hanging parts are custom-made in the factory according to the design requirements of the drawings. They are fixed to the main keel 4 and secondary keel 5 with machine bolts 6. The bolt holes of the hanging parts are long bolt holes 145, which are adjustable installation holes. The back hanging parts 2, board seam hanging parts 17, external corner hanging parts 14 and corner bracket 3 are connected and combined with fastening bolts 9 to form a kit, which is convenient for later on-site installation. The fixing bolts connecting the back hanging parts 2, board seam hanging parts 17, external corner hanging parts 14 and corner bracket 3 are not tightened at first. They are tightened after the flatness of the asbestos-free calcium silicate board 1 is corrected to meet the requirements.

[0101] Step 10: Installation of asbestos-free calcium silicate board 1

[0102] Asbestos-free calcium silicate boards 1 are installed row by row from bottom to top. Each row starts from one corner on one side and moves towards the other. The distance between the hangers is ≥100mm from the corner of the board. The spacing between each hanger is 300-600mm, and there are at least 4 hangers per board. A gap of 15-18mm is left between the asbestos-free calcium silicate boards 1. The first asbestos-free calcium silicate board 1 is inserted into the groove of the back hanger 2, and the horizontal board seam hanger 17 is fastened. After a rough adjustment of the position, the bolts are initially tightened. The two back hangers 2 in the upper row are adjusted vertically to the wall according to the flatness control line. Move the asbestos-free calcium silicate board 1 left and right according to the vertical seam straightness control line to align the edge of the board with the control line, and fasten the vertical seam hanger 17. After the flatness of the asbestos-free calcium silicate board 1 meets the requirements, tighten all the fastening anchor bolts 8 on the seam hanger 17. Install the remaining asbestos-free calcium silicate boards 1 in sequence according to the above steps, and adjust the vertical seam of the board being installed by moving it left and right to avoid excessive force causing the adjacent board to shift. Correct the deviation by using the set control line. After the deviation is corrected, fasten the vertical seam hanger 17. During the installation process, use a 2m straightedge to check the flatness of the board surface frequently.

[0103] Clean the surface and seams of the asbestos-free calcium silicate board 1, and install the sealing element 18. Fill the seam with the back of the sealing body 181 facing the limiting plate 172, and use the on-site steel bar head. The end of the steel bar head has a spherical structure. The front of the sealing body 181 is squeezed and deformed, which drives the connecting claws 182 at both ends to enter the corresponding hook groove. The connecting claws 182 are locked in the opposite direction in the hook groove to form a waterproof structure. The sliding plate 183 and the limiting plate 172 are locked and fixed by the one-way ratchet 185 to prevent resetting.

[0104] Step 11: Apply weather-resistant sealant

[0105] According to the requirements of the board joint width, paper tape is applied to both sides of the board joint. When applying sealant, first use a glue gun to apply an appropriate amount of weather-resistant glue evenly to the outside of the sealing body 181 inside the board joint. The overlap width with the decorative board surface should not be less than 1mm to ensure a tight seal. After applying the glue, the paper tape should be removed. The paper tape should not be left on the board surface for more than 2 hours to avoid damaging the decorative layer of the board surface.

[0106] Step 12: Clean one side of the asbestos-free calcium silicate board.

[0107] The surface of the board should be cleaned only after the weather-resistant adhesive has cured. First, clean the dust and dirt from the edges of the non-asbestos calcium silicate board. For decorative boards with a protective film, the surface of the decorative board should not be damaged during the process of removing the protective film.

[0108] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. The substitutions may be replacements of some structures, devices, or method steps, or they may be complete technical solutions. Equivalent substitutions or modifications made to the technical solutions and inventive concepts of the present invention should all be covered within the scope of protection of the present invention.

Claims

1. A dry hanging system for an asbestos-free calcium silicate board curtain wall, characterized in that, The utility model relates to a kind of wall hanging system, including: Concrete structure (13); Anchor plate (11), is fixed on concrete structure (13) by anchor bolt (8); Keel system, is fixed by main keel (4) and secondary keel (5), and is fixedly installed by special conversion piece (7), external corner conversion piece (16) and anchor plate (11); Corner code (3), is fixedly installed on keel system by mechanism bolt (6); Hanging piece, is installed on corner code (3) by fastening bolt (9), and hanging piece includes: Back hanging piece (2), is suitable for being hung on the back of asbestos-free calcium silicate board (1); Board joint hanging piece (17), is suitable for being hung on the board joint of adjacent two asbestos-free calcium silicate boards (1); External corner hanging piece (14), and it is suitable for installing asbestos-free calcium silicate board (1) side portion; Wherein, external corner hanging piece (14) includes connecting bottom plate (141), backing plate two (143), backing plate one (142) and reinforcing rib (144), connecting bottom plate (141) is fixed on corner code (3) by fastening bolt (9), connecting bottom plate (141) is L-shaped structure, backing plate one (142) and backing plate two (143) are 90 ° arrangement, reinforcing rib (144) is fixedly arranged at the bottom of connecting bottom plate (141) and is located on the same side with backing plate one (142), the side of connecting bottom plate (141) where backing plate two (143) is arranged and the side of reinforcing rib (144) close to backing plate one (142) are limiting surface, and backing plate one (142) and backing plate two (143) are suitable for fixed asbestos-free calcium silicate board (1); The board joint hanging piece (17) includes limiting plate one (171), limiting plate two (172) and connecting plate (173), the connecting plate (173) is suitable for being provided with long bolt hole (145), the limiting plate one (171) and the limiting plate two (172) are both provided with two groups of symmetrically arranged on the two sides of the connecting plate (173), the limiting plate one (171) is located on the back of asbestos-free calcium silicate board (1) and the width is greater than the width of the limiting plate two (172), and the side portion of asbestos-free calcium silicate board (1) is provided with slot two (174), and slot two (174) is suitable for installing limiting plate two (172) and sealing element (18); The inside of the slot two (174) is provided with hook groove, and the sealing element (18) includes two groups of sealing bodies (181) installed in the inside of hook groove at the board joint, the end of the sealing body (181) is provided with connecting claw (182) on the front surface, the back surface of the sealing body (181) is provided with two symmetrically arranged sliding plates (183), and the two ends of the two groups of sliding plates (183) are connected with elastic body (184), and one-way ratchet (185) is arranged between the sliding plate (183) and the limiting plate two (172).

2. The dry hanging system for the non-asbestos calcium silicate board curtain wall according to claim 1, characterized in that, The connecting bottom plate (141), the board joint hanging piece (17) and the back hanging piece (2) are all provided with long bolt hole (145) for fastening bolt (9) to move adjust along the length direction.

3. The dry hanging system for the non-asbestos calcium silicate board curtain wall according to claim 2, characterized in that, The side of the backing plate one (142) and the backing plate two (143) away from the connecting bottom plate (141) is provided with hook portion, and the hook portion is suitable for being fixed asbestos-free calcium silicate board (1) with limiting surface, and the side portion of asbestos-free calcium silicate board (1) is provided with slot one, and slot one is suitable for being adapted with hook portion.

4. The dry hanging system for the non-asbestos calcium silicate board curtain wall according to claim 3, characterized in that, The front surface of the sealing body (181) is an arched rubber sheet.

5. The dry hanging system for the non-asbestos calcium silicate board curtain wall according to claim 4, characterized in that, The width of the limiting plate two (172) is 1 / 2 to 3 / 4 of the width of the limiting plate one (171).

6. The dry hanging system for the non-asbestos calcium silicate board curtain wall according to claim 5, characterized in that, The width of the hook part is 1 / 3 to 1 / 2 of the length of the supporting plate.

7. A construction method of the dry hanging system of the asbestos-free calcium silicate board curtain wall according to claim 1, characterized in that, The construction steps are as follows: Step 1, concrete structure (13) treatment The residual mortar and scattered concrete on the surface of the base wall are cleaned, if the base layer has the phenomena of hollowing, cracking and shell, it is cut open by a grinding machine, cleaned, and leveled by layers of cement mortar after being wetted with water; Step 2, release of reference line The one-meter line of each building is measured, and the window elevation line of each floor is drawn according to the one-meter line and checked. Before the construction of the curtain wall, the vertical flatness of the building exterior wall should be measured, and the reference surface of the main and secondary curtain wall keels (5) is determined according to the vertical flatness measurement result. The measurement and positioning of the curtain wall should be combined with the measurement and positioning of the frame concrete main structure. The control line for controlling the verticality and flatness of the curtain wall is measured on the exterior wall elevation, and the position of each vertical keel is positioned according to the curtain wall keel arrangement drawing and the deepening construction drawing. The position of the rear anchor plate (11) is marked according to the positioning size of the main keel (4); Step 3, positioning of rear embedded part A paper anchor plate (11) with the same shape and size as the rear anchor plate (11) is made of paper board. The longitudinal and transverse center lines are marked on the paper anchor plate (11), and the paper anchor plate (11) is pasted on the wall so that the marked longitudinal and transverse center lines are aligned with each vertical keel positioning line. The chemical anchor bolt (8) drilling range is made at the four mounting hole positions. The size of the long hole of the anchor plate (11) should be marked on the wall to prevent the drilling position from being adjusted due to the steel bar in the later drilling process; Step 4, anchor bolt (8) installation According to the point position marked by the rear embedded part positioning, the hole is drilled by impact drilling. The hole depth is marked by the drill bit. After drilling, the hole is cleaned by air compressor. The dust in the hole should be cleaned. The matched chemical agent is placed in the hole according to the direction. The screw rod is rotated and inserted into the hole by electric tool. The bolt should not be forcibly inserted into the hole by hammering; When the rotating bolt reaches the bottom of the hole or the anchoring depth requirement, stop rotating immediately. The anchor bolt (8) should not be disturbed before the chemical agent is completely solidified. After the strength is reached after standing, the next process can be constructed; Step 5, pull-out test; The safety of the curtain wall depends on the anchoring strength of the chemical anchor bolt (8). Whether the anchoring strength of the chemical bolt meets the design and specification requirements must be proved by the on-site pull-out test. After the on-site pull-out test is qualified, the anchor plate (11) can be installed; Step 6, main keel (4) installation Main keel (4) anchor bolt (8) connection hole according to the design spacing, combined with the anchor bolt (8) opening spacing, the main keel (4) anchor bolt (8) connection point required opening position is positioned and marked, then the anchor bolt (8) mounting hole is opened using the bench drill, first install the vertical main keel (4) at both ends of the outer wall, the main keel (4) is in place, then the main keel (4) is connected with the special conversion piece (7) through the anchor bolt (8), the position of the vertical main keel (4) is determined according to the longitudinal and transverse vertical flatness control line of the curtain wall, to ensure that the spacing and vertical flatness of the vertical main keel (4) meet the specification requirements, after the vertical main keel (4) at both ends of the outer wall is installed, the control line is drawn according to the reference surface of the vertical main keel (4) at both ends during the installation of the vertical keel in the middle, which is used to adjust the vertical flatness of the vertical keel in the middle, the keel is installed from bottom to top, the expansion joint gap is left at the end of the upper and lower main keel (4) according to the design requirements in the drawing, the upper and lower keels at the expansion joint part are connected by sleeving the core, and the lightning protection requirements are met, the upper and lower keels are connected by crossing and connecting with the woven copper wire; Step 7, sub-keel (5) installation After the main keel (4) is installed, the installation positioning line of each row of horizontal sub-keel (5) is popped on the main keel (4) according to the horizontal installation control line, the design keel height and width in the drawing and the width of the horizontal joint of the non-asbestos calcium silicate board (1), each row of positioning line must be closed along the four sides of the building, after rechecking that there is no error, the horizontal sub-keel (5) can be welded, the sub-keel (5) is aligned with the installation positioning line, temporarily fixed by spot welding, the position is checked whether accurate or not, the flatness is checked and adjusted by using a level, and after the check is qualified, full welding is carried out for fixation; Step 8, concealed acceptance After the main and sub-keel (5) are completely installed, the keel concealed acceptance must be carried out together with the supervision and the construction unit, and after the acceptance is qualified, the hanging piece and the calcium silicate board are installed; Step 9, hanging piece installation The corner code (3) and the special hanging piece are processed according to the design requirements in the drawing, the machine-made bolt (6) is fixed with the main keel (4) and the sub-keel (5), the hanging piece bolt hole is a long bolt hole (145), which is an adjustable installation hole, the fastening bolt (9) is used to connect and combine the back hanging piece (2), the board joint hanging piece (17) and the external corner hanging piece (14) with the corner code (3) to form a set, which is convenient for on-site installation in the later period, the fixed bolt of the back hanging piece (2), the board joint hanging piece (17) and the external corner hanging piece (14) connected with the corner code (3) is not tightened first, and is tightened after the installation flatness of the non-asbestos calcium silicate board (1) meets the requirements; Step 10, non-asbestos calcium silicate board (1) installation The asbestos-free calcium silicate board (1) is installed from bottom to top row by row, each row is installed from one corner to the other corner of the asbestos-free calcium silicate board (1), the distance between the hanging pieces is greater than or equal to 100mm, the distance between the middle hanging pieces is 300-600mm, and each plate has no less than four, the gap between the asbestos-free calcium silicate boards (1) is 15-18mm, the first asbestos-free calcium silicate board (1) is inserted into the back hanging piece (2) slot, the horizontal plate joint hanging piece (17) is buckled, the position is roughly adjusted, the bolt is initially tightened, the upper two back hanging pieces (2) are adjusted along the vertical wall surface direction according to the flatness control line, the asbestos-free calcium silicate board (1) is moved left and right according to the vertical joint straightness control line to align the plate edge with the control line, the vertical plate joint hanging piece (17) is buckled, the flatness of the asbestos-free calcium silicate board (1) meets the requirements, and all the fastening anchors (8) on the plate joint hanging piece (17) are tightened, and the remaining asbestos-free calcium silicate boards (1) are installed according to the above steps, the vertical joint of the plate being installed is adjusted left and right to avoid excessive force causing displacement of adjacent plates; the control line is set to correct the deviation, the vertical plate joint hanging piece (17) is buckled after the correction is completed, and the flatness of the plate surface during installation is checked frequently with a 2m ruler; The asbestos-free calcium silicate board (1) is cleaned, the sealing piece (18) is installed, the back of the sealing body (181) is filled into the plate joint by facing one side of the limiting plate two (172), and the steel bar head is used, the end of the steel bar head is a spherical structure, the front is extruded to the sealing body (181), the sealing body (181) is bent and deformed to drive the connecting claws (182) at both ends into the corresponding hooking grooves, the connecting claws (182) are locked in the opposite direction to form a waterproof structure, and the sliding plate (183) and the limiting plate two (172) are fixed by the one-way ratchet (185) to avoid resetting; Step 11, weather-resistant glue is applied According to the width of the plate joint, paper adhesive tape is attached to both sides of the plate joint, weather-resistant glue is applied in the plate joint, the weather-resistant glue is evenly and appropriately applied on the outside of the sealing body (181) by using a glue gun, the overlapping width with the decorative plate surface should be greater than or equal to 1mm, the weather-resistant glue is applied to ensure that the whole sealing is tight, and the paper adhesive tape is torn off after the glue is applied, the time for which the paper adhesive tape is attached to the plate surface should be no more than 2 hours, so as to avoid damaging the decorative plate surface during the tearing of the protective film. Step 12, clean the asbestos-free calcium silicate board (1) surface The asbestos-free calcium silicate board (1) surface should be cleaned after the weather-resistant glue is cured, the dust and dirt on the edges of the asbestos-free calcium silicate board (1) are cleaned, the protective film of the decorative plate is not damaged during the tearing of the protective film.

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