An ALC outer wall dry hanging system based on an assembled hook bolt and a construction method thereof

Abstract

An ALC (Alternating Current Carrier) exterior wall dry-hanging system and its construction method based on prefabricated hook bolts are disclosed. The system includes ALC exterior wall panels, floor slabs, structural beams, prefabricated hook bolt assemblies, and connectors. The upper and lower parts of the ALC exterior wall panels have installation holes. The connectors are L-shaped and fixed to the top of the floor slab and the bottom of the structural beam. The prefabricated hook bolt assembly includes a bolt shank, an expansion sleeve, an elastic washer, a sector-shaped locking head, and fasteners. The bolt shank passes through the expansion sleeve and is threadedly connected to the sector-shaped locking head. The sector-shaped locking head clamps the vertical edge of the connector through a locking groove and is further secured by the fasteners. During construction, the connectors are first fixed, then the ALC exterior wall panels are hoisted. The sector-shaped locking head is installed from the indoor side, and the bolt shank is inserted and tightened from the outdoor side. Finally, the expansion sleeve is expanded and anchored by tightening the bolt shank. This invention eliminates on-site welding, achieving purely mechanical dry-hanging installation, and has the advantages of safety and environmental protection, rapid construction, reliable connection, and adaptability to prefabricated construction.

Description

Technical Field

[0001] This invention belongs to the field of civil engineering construction technology, and specifically relates to an ALC external wall dry-hanging system based on assembled hook bolts and its construction method. Background Technology

[0002] In current prefabricated construction, ALC (Autoclaved Lightweight Concrete) panels are widely used in exterior wall cladding systems due to their excellent lightweight, thermal insulation, fire resistance, and ease of processing. Traditional ALC exterior wall installation, especially the connection to the sides or top of the main structure, often employs welding. Specifically, L-shaped or U-shaped connecting iron parts are typically first fixed to concrete beams, columns, or floor slabs using chemical anchors or pre-embedded methods. Then, hook bolts or similar connecting rods are welded to these iron parts on-site, and finally, the ALC wall panels are fixed using these connecting rods.

[0003] However, this traditional welding process has significant limitations: First, welding involves open flames, posing serious fire and safety hazards at construction sites, especially in petrochemical, warehousing, or areas with flammable and explosive materials or dense protective measures, and is often strictly prohibited, leading to project delays. Second, the welding process generates large amounts of smoke, arc light, and harmful gases, exacerbating PM2.5 and other particulate pollution at the construction site, which does not comply with green construction and increasingly stringent environmental regulations. Third, welding requires professional welders, equipment, and hot work permits; the process is cumbersome and highly susceptible to weather and environmental conditions. Post-weld anti-corrosion treatment is also required, resulting in a long overall construction cycle, complex procedures, low efficiency, and high labor costs, contradicting the efficient and standardized principles of prefabricated construction. Fourth, welding quality heavily relies on the operator's skill level, easily leading to defects such as incomplete welds and undercuts, resulting in significant quality fluctuations and affecting the long-term reliability and durability of the joints.

[0004] Therefore, developing an ALC exterior wall system that completely eliminates on-site welding and achieves rapid, purely mechanical installation is of great significance for promoting building industrialization, ensuring construction safety, and improving construction efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide an ALC exterior wall dry-hanging system based on assembled hook bolts and its construction method, in order to solve the technical problems of existing ALC exterior wall installation relying on on-site welding operations, such as significant safety hazards, heavy environmental pollution, low construction efficiency, large quality fluctuations, and difficulty in adapting to the needs of prefabricated building industrialization construction.

[0006] To achieve the above objectives, the present invention adopts the following technical solution.

[0007] An ALC exterior wall dry-hanging system based on assembled hook bolts includes an ALC exterior wall panel, a floor slab at the bottom of the ALC exterior wall panel, and a structural beam at the top of the ALC exterior wall panel; the upper and lower parts of the ALC exterior wall panel are respectively provided with installation channels spaced laterally. The ALC exterior wall dry-hanging system also includes assembled hook bolt assemblies and connectors; the connectors are located at the top and bottom of the ALC exterior wall panel; each connector has an L-shaped cross-section, with its horizontal side connected to the top of the floor slab or the bottom of the structural beam, and its vertical side attached to the inner surface of the ALC exterior wall panel; there are two sets of assembled hook bolt assemblies, respectively installed in the mounting holes at the upper and lower parts of the ALC exterior wall panel; each assembled hook bolt assembly includes a bolt shank, an expansion sleeve, an elastic washer, a sector-shaped locking head, and fasteners; the expansion sleeve is inserted into the mounting hole. A bolt rod is provided inside the expansion sleeve; the outer end of the bolt rod is provided with a hexagonal bolt head, and the inner end of the bolt rod is provided with a threaded section; the inner end of the bolt rod extends beyond the inner end of the expansion sleeve; one end of the sector-shaped locking head is provided with a threaded blind hole that mates with the threaded section, and the sector-shaped locking head is threadedly connected to the inner end of the bolt rod; the other side of the sector-shaped locking head is provided with two clamping pieces at the top or bottom, and a locking groove for clamping the connector is formed between the two clamping pieces; the vertical edge of the connector is inserted into the locking groove; the fastener passes through the clamping pieces of the sector-shaped locking head and the vertical edge of the connector to fix the sector-shaped locking head to the connector.

[0008] Preferably, the mounting channel is a variable diameter channel, including a large diameter section near the outdoor side and a small diameter section near the indoor side.

[0009] Preferably, an elastic washer is fitted on the bolt shank between the hexagonal bolt head and the expansion sleeve; the outer diameter of the elastic washer is smaller than the diameter of the large-diameter section and larger than the diameter of the small-diameter section.

[0010] Preferably, the locking groove of the fan-shaped locking head has a cross-section that is wider at the top and narrower at the bottom, and its clamping piece has an anti-slip protrusion on the side near the locking groove.

[0011] Preferably, the transverse edge of the connector is connected to the floor slab or structural beam by anchor bolts.

[0012] Preferably, at least one end face of the elastic washer is provided with anti-slip teeth.

[0013] Preferably, the expansion sleeve is made of plastic, and the outer diameter of the expansion sleeve is smaller than the aperture of the small diameter section.

[0014] A construction method for an ALC exterior wall dry-hanging system includes the following steps.

[0015] Step 1: Fix the connectors to the designed positions on the floor slabs and structural beams of the main building structure.

[0016] Step 2: Pre-drill installation holes on the ALC exterior wall panel at the positions corresponding to the connectors.

[0017] Step 3: Hoist the ALC exterior wall panels into place.

[0018] Step 4: Insert the sector-shaped locking head into the installation hole from the indoor side and lock the locking groove onto the connector.

[0019] Step 5: Insert the bolt rod with the expansion sleeve into the installation hole from the outdoor side, and screw the inner end of the bolt rod into the threaded blind hole of the fan-shaped locking head for initial fixation.

[0020] Step 6: Pass the fastener through the clip of the sector locking head and the vertical edge of the connector to fix the sector locking head to the connector.

[0021] Step 7: Tighten the hexagonal bolt head of the bolt rod to further lock the connector with the sector-shaped locking head, and to expand and anchor the expansion sleeve within the small-diameter section of the installation channel.

[0022] Preferably, in step five, an elastic washer is fitted on the bolt rod between the hexagonal bolt head and the expansion sleeve; the diameter of the large-diameter section of the mounting hole is larger than the circumscribed circle diameter of the hexagonal bolt head, and the diameter of the small-diameter section is larger than the outer diameter of the expansion sleeve and smaller than the outer diameter of the elastic washer.

[0023] Preferably, in step four, the fan-shaped locking head is rotated to initially clamp the connector.

[0024] Compared with the prior art, the present invention has the following features and beneficial effects.

[0025] 1. The ALC exterior wall dry-hanging system based on modular hook bolts of this invention achieves a non-destructive, efficient, and highly reliable connection between the ALC wall panel and the main structure through innovative modular mechanical connectors. This completely eliminates on-site hot work and significantly improves installation speed and project quality. The entire installation process uses mechanical cold connections, requiring no on-site hot work (welding, cutting), fundamentally eliminating major safety risks such as fires and explosions caused by welding. This makes this invention particularly suitable for chemical plants, gas stations, data centers, areas surrounding historical buildings and other special construction sites with strict fire restrictions, greatly expanding the application scenarios of ALC wall panels.

[0026] 2. The ALC exterior wall dry-hanging system based on assembled hook bolts of this invention achieves reliable anchoring between ALC wall panels and structural beams and floor slabs. This method involves pre-installing L-shaped connectors on the structural beams or floor slabs, then embedding the fan-shaped locking head of the assembled hook bolt assembly into the L-shaped connector and locking it with M5 self-tapping screws, forming a weld-free mechanical connection node. The outer end of the bolt shank is fastened to the ALC exterior wall panel via a plastic expansion tube, and anti-slip elastic washers and anti-slip serrations effectively prevent loosening. The entire installation process is simple to operate, highly efficient, completely eliminates on-site hot work, and significantly improves installation speed and project quality. The entire installation process uses entirely mechanical cold connections, requiring no on-site hot work (welding, cutting), fundamentally eliminating major safety risks such as fires and explosions caused by welding.

[0027] 3. Compared to traditional welding processes that require multiple complex steps such as welders, welding machines, hot work permits, and post-weld treatment, this invention allows all connecting components to be prefabricated in the factory and assembled on-site. This truly realizes "dry construction," a perfect extension of prefabricated building technology, and helps improve the prefabrication rate of projects. On-site operations consist only of basic mechanical operations such as "insertion, rotation, and tightening," reducing the skill requirements for workers and allowing for quick training. The time required to install a single connection point is significantly shortened, greatly increasing the wall installation speed and effectively compressing the overall construction cycle, meeting the market demand for rapid construction. Simultaneously, this invention highly aligns with green environmental protection and prefabricated construction concepts, avoiding welding fumes, harmful gases, and light pollution, resulting in a clean construction environment that meets the mandatory requirements of national green building and civilized construction.

[0028] 4. The locking groove design of the sector-shaped locking head in this invention creates a mechanical self-locking effect that tightens as it is pulled under force, effectively resisting the outward force of the wall panel; the expansion sleeve's expansion force within the ALC plate hole provides strong static friction resistance, which is the main mechanism for resisting vertical loads and some horizontal loads; the self-tapping screw rigidly connects the sector-shaped locking head to the connector, completely eliminating the possibility of loosening of the connection node due to vibration or stress changes during use.

[0029] 5. The elastic washer in this invention prevents the bolt shank from loosening under long-term vibration through toothed engagement or deformation. These four layers of protection jointly ensure the extreme reliability and durability of the connection joint under wind loads, seismic action, and long-term use; construction quality no longer depends on the welder's individual skill, but is controlled by the precision of the prefabricated components and the tightening torque. The torque value can be conveniently and accurately quantitatively controlled and subsequently inspected using a torque wrench, ensuring that each connection point achieves the designed tightening force, resulting in uniform, stable, and controllable project quality.

[0030] 6. The connection system in this invention has a certain ability to adjust for construction errors. If it is necessary to maintain or replace a wall panel, it can be disassembled simply by loosening the bolts at a specific point from the outside side, thus realizing the "replaceability" of the exterior wall panel and providing convenience for the later maintenance and upgrading of the building. Attached Figure Description

[0031] The present invention will now be described in further detail with reference to the accompanying drawings.

[0032] Figure 1 This is a three-dimensional structural diagram of the ALC external wall dry-hanging system in this invention.

[0033] Figure 2 This is a side structural diagram of the ALC external wall dry-hanging system in this invention.

[0034] Figure 3 This is a schematic diagram of the connection node between the ALC exterior wall panel and the structural beam in this invention.

[0035] Figure 4 This is a schematic diagram of the bolt rod in this invention.

[0036] Figure 5 This is a side view of the fan-shaped locking head in this invention.

[0037] Figure 6 This is a front structural diagram of the fan-shaped locking head in this invention.

[0038] Figure 7 This is a schematic diagram of the elastic washer in this invention.

[0039] Reference numerals: 1-ALC exterior wall panel, 2-Assembled hook bolt assembly, 2.1-Bolt shank, 2.1.1-Hexagonal bolt head, 2.1.2-Threaded section, 2.2-Expansion sleeve, 2.3-Elastic washer, 2.4-Sector locking head, 2.4.1-Threaded blind hole, 2.4.2-Clamping piece, 2.4.3-Locking groove, 2.4.4-Anti-slip ridge, 2.4.5-Anti-blocking pad, 2.5-Fastener, 3-Anchor bolt, 4-Connector, 5-Mounting hole, 5.1-Large diameter section, 5.2-Small diameter section, 6-Structural beam, 7-Floor slab, 8-Anti-slip serrations. Detailed Implementation

[0040] like Figure 1-7 As shown, this ALC exterior wall dry-hanging system based on assembled hook bolts includes an ALC exterior wall panel 1, a floor slab 7 set at the bottom of the ALC exterior wall panel 1, and a structural beam 6 set at the top of the ALC exterior wall panel 1; the upper and lower parts of the ALC exterior wall panel 1 are respectively provided with installation channels 5 at transverse intervals. The ALC exterior wall dry-hanging system also includes a modular hook bolt assembly 2 and connectors 4; the connectors 4 are located at the top and bottom of the ALC exterior wall panel 1; each connector 4 has an L-shaped cross-section, with its horizontal side connected to the top of the floor slab 7 or the bottom of the structural beam 6, and its vertical side attached to the inner surface of the ALC exterior wall panel 1; the modular hook bolt assembly 2 has two sets, respectively located in the mounting holes 5 at the upper and lower parts of the ALC exterior wall panel 1; the modular hook bolt assembly 2 includes a bolt shank 2.1, an expansion sleeve 2.2, an elastic washer 2.3, a sector-shaped locking head 2.4, and a fastener 2.5; the expansion sleeve 2.2 is inserted into the mounting hole 5, and the bolt shank 2.1 is located inside the expansion sleeve 2.2; the bolt shank 2.1 is located outside the expansion sleeve 2.2; The bolt shank 2.1 has a hexagonal bolt head 2.1.1 at one end and a threaded section 2.1.2 at the inner end. The inner end of the bolt shank 2.1 extends beyond the inner end of the expansion sleeve 2.2. One end of the fan-shaped locking head 2.4 has a threaded blind hole 2.4.1 that mates with the threaded section 2.1.2. The fan-shaped locking head 2.4 is threadedly connected to the inner end of the bolt shank 2.1. The other side of the fan-shaped locking head 2.4 has two clamping pieces 2.4.2 at the top or bottom. A locking groove 2.4.3 for clamping the connector 4 is formed between the two clamping pieces 2.4.2. The vertical edge of the connector 4 is inserted into the locking groove 2.4.3. The fastener 2.5 passes through the clamping pieces 2.4.2 of the fan-shaped locking head 2.4 and the vertical edge of the connector 4 to fix the fan-shaped locking head 2.4 to the connector 4.

[0041] In this embodiment, the mounting channel 5 is a variable diameter channel, including a large diameter section 5.1 near the outdoor side and a small diameter section 5.2 near the indoor side.

[0042] In this embodiment, an elastic washer 2.3 is fitted on the bolt rod 2.1 between the hexagonal bolt head 2.1.1 and the expansion sleeve 2.2; the outer diameter of the elastic washer 2.3 is smaller than the hole diameter of the large diameter section 5.1 and larger than the hole diameter of the small diameter section 5.2.

[0043] In this embodiment, the cross-section of the locking groove 2.4.3 of the fan-shaped locking head 2.4 is a trapezoid or wedge shape that is wider at the top and narrower at the bottom, and the clamping piece 2.4.2 is provided with an anti-slip protrusion 2.4.4 on the side near the locking groove 2.4.3.

[0044] In this embodiment, the horizontal edge of the connector 4 is connected to the floor slab 7 or the structural beam 6 by anchor bolts 3.

[0045] In this embodiment, at least one end face of the elastic washer 2.3 is provided with anti-slip teeth 8; when at least two elastic washers 2.3 are provided, anti-slip teeth 8 are provided on both end faces of the elastic washer 2.3.

[0046] In this embodiment, the expansion sleeve 2.2 is made of plastic, and the outer diameter of the expansion sleeve 2.2 is smaller than the aperture of the small diameter section 5.2.

[0047] The construction method for this ALC exterior wall dry-hanging system includes the following steps.

[0048] Step 1: Fix the connector 4 to the designed positions of the floor slab 7 and structural beam 6 of the main building structure.

[0049] Step 2: Pre-fabricate the installation holes 5 on the ALC exterior wall panel 1 at the positions corresponding to the connectors 4.

[0050] Step 3: Hoist the ALC exterior wall panel 1 into place.

[0051] Step 4: Insert the sector-shaped locking head 2.4 into the mounting hole 5 from the indoor side, and lock the locking groove 2.4.3 onto the connector 4.

[0052] Step 5: Insert the bolt rod 2.1, fitted with the expansion sleeve 2.2, into the installation hole 5 from the outdoor side, and screw the inner end of the bolt rod 2.1 into the threaded blind hole 2.4.1 of the sector-shaped locking head 2.4 for initial fixation. During the tightening process of the bolt rod 2.1 and the sector-shaped locking head 2.4, the plastic expansion sleeve 2.2 expands under force, increasing the contact area with the ALC exterior wall panel 1 and enhancing the connection strength between the bolt and the ALC exterior wall panel 1.

[0053] Step 6: Pass the fastener 2.5 through the clip 2.4.2 of the fan-shaped locking head 2.4 and the vertical edge of the connector 4 to fix the fan-shaped locking head 2.4 to the connector 4.

[0054] Step 7: Tighten the hexagonal bolt head 2.1.1 of bolt rod 2.1 to further lock the connecting piece 4 with the sector locking head 2.4, and to expand and anchor the expansion sleeve 2.2 within the small diameter section 5.2 of the mounting hole 5.

[0055] In this embodiment, the fastener 2.5 is a self-tapping screw.

[0056] In this embodiment, in step five, an elastic washer 2.3 is fitted on the bolt rod 2.1 between the hexagonal bolt head 2.1.1 and the expansion sleeve 2.2; the diameter of the large-diameter section 5.1 of the mounting hole 5 is larger than the outer diameter of the hexagonal bolt head 2.1.1, and the diameter of the small-diameter section 5.2 is larger than the outer diameter of the expansion sleeve 2.2 and smaller than the outer diameter of the elastic washer 2.3.

[0057] In this embodiment, in step four, the fan-shaped locking head 2.4 is rotated to initially clamp the connector 4.

[0058] In this embodiment, the connector 4 is fixed to the main structure by chemical anchors or mechanical expansion anchors.

[0059] In this embodiment, a torque wrench is used to apply a preset tightening torque to the hexagonal bolt head 2.1.1.

[0060] In this embodiment, before the ALC exterior wall panel 1 is hoisted, installation channels 5 need to be reserved according to the height of the connector 4 for the construction operation of the assembled hook bolt assembly 2. The diameter of the installation channel 5 at the outdoor part 2cm from the panel surface is slightly larger than the outermost dimension of the hexagonal bolt head 2.1.1, which facilitates the installation of the bolt rod 2.1 and the elastic washer 2.3. The diameter of the installation channel 5 beyond 2cm is slightly larger than the diameter of the expansion sleeve 2.2, and can prevent the elastic washer 2.3 from moving inward.

[0061] In this embodiment, the space between the two clamping pieces 2.4.2 is designed as a trapezoidal structure in cross-section, that is, narrow at the bottom and wide at the top. The width of the narrow side at the bottom is less than the thickness of the connector 4, and the width at the top is greater than the thickness of the connector 4. The clamping piece 2.4.2 has an anti-slip protrusion 2.4.4 inside. The anti-slip protrusion 2.4.4 increases the friction between the fan-shaped locking head 2.4 and the connector 4 through the trapezoidal opening, thus achieving a secure and reliable connection. A 3.5mm diameter circular hole is reserved in the middle of the clamping piece 2.4.2. The fan-shaped locking head 2.4 and the connector 4 are connected as a whole by a self-tapping screw inserted in the circular hole. The head of the fan-shaped locking head 2.4 is provided with an anti-blocking pad 2.4.5 to withstand the force transmitted to the fan-shaped locking head 2.4 by the expansion sleeve 2.2 after the bolt rod 2.1 is tightened.

[0062] The above embodiments are not exhaustive examples of specific implementation methods, and other embodiments are also possible. The purpose of the above embodiments is to illustrate the present invention, rather than to limit the scope of protection of the present invention. All applications derived from simple variations of the present invention fall within the scope of protection of the present invention.

Claims

1. An ALC exterior wall dry-hanging system based on assembled hook bolts, comprising an ALC exterior wall panel (1), a floor slab (7) disposed at the bottom of the ALC exterior wall panel (1), and a structural beam (6) disposed at the top of the ALC exterior wall panel (1); characterized in that: The upper and lower parts of the ALC exterior wall panel (1) are respectively provided with installation holes (5) spaced apart in the horizontal direction. The ALC exterior wall dry-hanging system also includes a modular hook bolt assembly (2) and connectors (4); the connectors (4) are set at the top and bottom of the ALC exterior wall panel (1); each connector (4) has an L-shaped cross-section, and the horizontal side of the connector (4) is connected to the top of the floor slab (7) or the bottom of the structural beam (6), and the vertical side of the connector (4) is attached to the inner side of the ALC exterior wall panel (1); the modular hook bolt assembly (2) has two sets. The mounting holes (5) are respectively installed in the upper and lower parts of the ALC exterior wall panel (1); the assembled hook bolt assembly (2) includes a bolt rod (2.1), an expansion sleeve (2.2), an elastic washer (2.3), a sector-shaped locking head (2.4), and a fastener (2.5); the expansion sleeve (2.2) is inserted into the mounting hole (5), and the bolt rod (2.1) is provided inside the expansion sleeve (2.2); the bolt rod (2.1) The outer end is provided with a hexagonal bolt head (2.1.1), and the inner end of the bolt rod (2.1) is provided with a threaded section (2.1.2); the inner end of the bolt rod (2.1) extends beyond the inner end of the expansion sleeve (2.2); one end of the sector-shaped locking head (2.4) is provided with a threaded blind hole (2.4.1) that mates with the threaded section (2.1.2), and the sector-shaped locking head (2.4) is threadedly connected to the inner end of the bolt rod (2.1); the sector-shaped locking head (2.4) Two clamping pieces (2.4.2) are provided on the top or bottom of the other side, and a locking groove (2.4.3) for clamping the connector (4) is formed between the two clamping pieces (2.4.2); the vertical side of the connector (4) is inserted into the locking groove (2.4.3); the fastener (2.5) passes through the clamping piece (2.4.2) of the fan-shaped locking head (2.4) and the vertical side of the connector (4) to fix the fan-shaped locking head (2.4) to the connector (4).

2. The ALC exterior wall dry-hanging system based on assembled hook bolts according to claim 1, characterized in that: The mounting channel (5) is a variable diameter channel, including a large diameter section (5.1) near the outdoor side and a small diameter section (5.2) near the indoor side.

3. The ALC exterior wall dry-hanging system based on assembled hook bolts according to claim 2, characterized in that: An elastic washer (2.3) is fitted on the bolt rod (2.1) between the hexagonal bolt head (2.1.1) and the expansion sleeve (2.2); the outer diameter of the elastic washer (2.3) is smaller than the diameter of the large diameter section (5.1) and larger than the diameter of the small diameter section (5.2).

4. The ALC exterior wall dry-hanging system based on assembled hook bolts according to claim 1, characterized in that: The locking groove (2.4.3) of the fan-shaped locking head (2.4) has a cross-section that is wider at the top and narrower at the bottom, and the clamp (2.4.2) has an anti-slip protrusion (2.4.4) on the side near the locking groove (2.4.3).

5. The ALC exterior wall dry-hanging system based on assembled hook bolts according to claim 1, characterized in that: The transverse side of the connector (4) is connected to the floor slab (7) or structural beam (6) by anchor bolts (3).

6. The ALC exterior wall dry-hanging system based on assembled hook bolts according to claim 1, characterized in that: At least one end face of the elastic washer (2.3) is provided with anti-slip teeth (8).

7. The ALC exterior wall dry-hanging system based on assembled hook bolts according to claim 1, characterized in that: The expansion sleeve (2.2) is made of plastic, and the outer diameter of the expansion sleeve (2.2) is smaller than the aperture of the small diameter section (5.2).

8. A construction method for an ALC exterior wall dry-hanging system according to any one of claims 1-7, characterized in that, Includes the following steps: Step 1: Fix the connector (4) to the designed positions of the floor slab (7) and structural beam (6) of the main building structure; Step 2: Pre-fabricate installation holes (5) on the ALC exterior wall panel (1) at the positions corresponding to the connectors (4); Step 3: Hoist the ALC exterior wall panel (1) into place; Step 4: Insert the sector-shaped locking head (2.4) into the mounting hole (5) from the indoor side, and lock the locking groove (2.4.3) onto the connector (4); Step 5: Insert the bolt rod (2.1) fitted with the expansion sleeve (2.2) into the installation hole (5) from the outdoor side, and screw the inner end of the bolt rod (2.1) into the threaded blind hole (2.4.1) of the fan-shaped locking head (2.4) for initial fixation; Step 6: Pass the fastener (2.5) through the clamp (2.4.2) of the fan-shaped locking head (2.4) and the vertical edge of the connector (4) to fix the fan-shaped locking head (2.4) and the connector (4); Step 7: Tighten the hexagonal bolt head (2.1.1) of the bolt rod (2.1) to further lock the connecting piece (4) with the fan-shaped locking head (2.4) and to expand and anchor the expansion sleeve (2.2) in the installation channel (5).

9. The construction method of the ALC external wall dry-hanging system according to claim 8, characterized in that: In step five, an elastic washer (2.3) is fitted on the bolt rod (2.1) between the hexagonal bolt head (2.1.1) and the expansion sleeve (2.2); the diameter of the large-diameter section (5.1) of the mounting hole (5) is larger than the outer diameter of the hexagonal bolt head (2.1.1), and the diameter of the small-diameter section (5.2) is larger than the outer diameter of the expansion sleeve (2.2) and smaller than the outer diameter of the elastic washer (2.3).

10. The construction method of the ALC external wall dry-hanging system according to claim 8, characterized in that: In step four, the fan-shaped locking head (2.4) is rotated to initially clamp the connector (4).

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