Adjustable back bolt double insurance stone curtain wall structure

Abstract

This invention discloses an adjustable double-locking stone curtain wall structure, relating to the field of stone curtain wall technology. The invention includes a fixed frame and a stone body: the stone body is fixed to the rear of the fixed frame, and expansion bolts are symmetrically fixed to the upper rear side of the stone body; a back plate: the threaded portions of the two expansion bolts are movably connected to the back plate, and a limiting plate is fixed to the side of the back plate away from the stone body, with symmetrically vertically through-holes in the limiting plate; a fastening assembly: the fastening assembly includes adapter brackets and mounting screws, with mounting screws symmetrically fixed to the top of the vertical portion of the adapter brackets, and the two mounting screws passing through the two arc-shaped openings respectively; horizontal keels and anti-fall components: horizontal keels are provided at the bottom of the fastening assembly, and anti-fall components are symmetrically arranged within the horizontal keels at both ends of the fastening assembly, with the horizontal keels arranged in an L-shape. This invention solves the problem of balancing installation accuracy and long-term safety in traditional stone curtain wall connection systems.

Description

Technical Field

[0001] This invention belongs to the field of stone curtain wall technology, and in particular relates to a stone curtain wall structure with adjustable back bolts and double insurance. Background Technology

[0002] Stone curtain walls are independent enclosure systems suspended outside the main structure, consisting of three parts: panels, supporting framework, and connection system. They primarily resist external forces such as wind and earthquakes, and do not bear the load of the main structure. The panels are typically made of granite with a thickness of at least 25mm, and the area of ​​a single panel should ideally be controlled within 1.5㎡. The most advanced connection method is the back-bolted type, due to its reasonable stress distribution, good seismic performance, and ability to meet the requirements for joint design. The short-slot type is widely used and has a moderate cost. The steel pin type is strictly limited by regulations and is not suitable for high-rise buildings or areas with high seismic intensity. The supporting framework consists of columns and beams, usually made of steel or aluminum alloy. The columns are connected to the embedded parts of the main structure, and a 15mm expansion joint should be installed at approximately 6 meters to absorb temperature deformation. In design, safety is the primary principle, and the effects of gravity, wind, earthquakes, and temperature must be considered simultaneously, with the most unfavorable combination of effects calculated according to regulations. Meanwhile, a search of existing publicly available documents revealed a patent document with patent number CN210152019U, which discloses a high-strength adjustable anti-fallback back-bolted stone curtain wall structure system, including a keel, a bracket, hooks, and a stone curtain wall. The keel is installed on the main structure of the curtain wall. The bracket includes a horizontally arranged bracket mounting plate and a vertically arranged hook mounting plate. The bracket mounting plate is installed on the keel by bracket mounting bolts. The hook includes a support strip, a stone mounting plate, and a U-shaped hook claw. The stone curtain wall is connected to the stone mounting plate by back bolts. One end of the stone mounting plate is provided with a support strip. The other end of the stone mounting plate is provided with a U-shaped hook claw. The U-shaped hook claw is hung on the hook mounting plate. The top of the U-shaped hook claw is provided with a height adjustment screw and an anti-fallback screw. This curtain wall system has high mechanical strength and stability, can be easily used for anti-fallback safety limiting, and can release bending moments to prevent the system from being affected by stress concentration. However, on the one hand, traditional hanging structures have a single fixed or adjustable dimension, which cannot effectively absorb the construction errors accumulated in the main structure and stone processing. This makes it difficult to make fine adjustments to the flatness and gaps of the panels during installation, affecting the appearance quality and installation efficiency. On the other hand, long-term exposure to wind vibration, temperature difference and other environments can cause fasteners to loosen and rust. Existing structures lack secondary constraints independent of the main connection. Once the main connection fails, there is a risk of the panels falling from a height. These two requirements often hinder each other in traditional designs. The pursuit of flexible adjustment often sacrifices structural rigidity, while the emphasis on safety and locking limits the adjustment capability. Summary of the Invention

[0003] The purpose of this invention is to provide an adjustable back-bolt double-safety stone curtain wall structure, which solves the problem of traditional stone curtain wall connection systems being unable to balance installation accuracy and long-term safety.

[0004] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: This invention relates to an adjustable double-locking stone curtain wall structure, comprising a fixed frame and a stone body: the stone body is fixed to the rear of the fixed frame, the rear side of the stone body is flush with the rear side of the fixed frame, expansion bolts are symmetrically fixed to the upper rear side of the stone body, the threaded portion of the expansion bolts extends out of the rear side of the stone body, a back plate: the threaded portions of the two expansion bolts are movably connected to the back plate, a limiting plate is fixed to the side of the back plate away from the stone body, the limiting plate has symmetrically vertically through arc-shaped openings, a fastening assembly: the fastening assembly includes a transition bracket and mounting screws, the end of the transition bracket is L-shaped, the top of the vertical portion of the transition bracket is symmetrically fixed with mounting screws, the two mounting screws pass through the two arc-shaped openings respectively, a horizontal keel and a fall protection assembly: a horizontal keel is provided at the bottom of the fastening assembly, and fall protection assemblies are symmetrically provided in the horizontal keels at both ends of the fastening assembly, the horizontal keels are L-shaped.

[0005] Furthermore, an outer panel is fixed to the front of the fixed frame, and the outer panel is fixed to the rear side of the stone body.

[0006] Furthermore, the back plate has symmetrical through-holes for fixing, and the screw portion of the expansion bolt passes through the fixing holes. The stone body has symmetrical fixing openings on the rear side, and the fixing openings are located below the fastening components. Each screw portion of the expansion bolt is movably connected to two washers.

[0007] Furthermore, two washers on the same expansion bolt are placed on both sides of the back plate, and a fastening nut is threadedly connected to the end away from the stone body. The fastening nut abuts against the end of a washer located at the rear, away from the back plate.

[0008] Furthermore, the fastening assembly also includes a second washer and a second fastening nut. The mounting screws at the top and bottom of the limiting plate are movably connected to the periphery of the first washer, and the mounting screws at the top and bottom of the limiting plate are movably connected to the periphery of the second fastening nut. The two second washeres are disposed between the two second fastening nuts.

[0009] Furthermore, the fastening assembly also includes a reinforcing triangular plate and a sliding opening. The reinforcing triangular plate is fixed at the two edges on the inner side of the adapter bracket, and the bottom of the horizontal part of the reinforcing triangular plate is vertically and symmetrically provided with a sliding opening.

[0010] Furthermore, the adapter angle bracket is set on the top of the horizontal keel, and the top of the horizontal keel is symmetrically provided with mounting holes corresponding to the position of the adapter angle bracket, and the mounting holes correspond to the position of the sliding opening.

[0011] Furthermore, the fastening assembly also includes a fastening bolt, a washer, and a fastening nut. A fastening bolt is vertically inserted into each sliding port. The fastening bolt thread portion above the top of the horizontal part of the adapter bracket is threaded with a fastening nut. The fastening bolt thread portion at the bottom of the fastening nut is movably connected with a washer. The washer is located at the top of the horizontal part of the adapter bracket.

[0012] Furthermore, the fall protection assembly includes a fixing block, a column, and a limiting frame. The front ends of the fixing blocks of the two fall protection assemblies are respectively fixed in the fixing openings on the rear side of the two stone bodies. Each fixing block has a column fixed to its top, and the top of each column has a limiting frame fixed to its top. A slot is provided in the middle of the rear side of the limiting frame. The limiting frame is movably connected to the horizontal keel, and the horizontal part of the horizontal keel is movably connected to the slot.

[0013] The present invention has the following beneficial effects: In use, the adjustment system utilizes the arc-shaped opening on the limiting plate and the cooperation of the mounting screw to simultaneously achieve bidirectional fine adjustment of height and angle at a single node. After adjustment, stable locking is provided by the elastic clamping of the upper and lower fastening nuts and washers. At the same time, the independently set anti-fall component forms a force transmission chain physically parallel to the main fastening path through the fixing block, column and limiting structure with slot. Under normal conditions, it follows the movement and guides, and independently supports the load when the main connection fails. The two systems are both functionally decoupled (adjustment does not affect the reliability of anti-fall, and anti-fall does not restrict the degree of freedom of adjustment) and structurally integrated, thus providing dual safety protection for the curtain wall during long-term service without sacrificing installation flexibility. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 A rear-view three-dimensional view of a stone curtain wall structure with adjustable back bolts and double safety features; Figure 2 A three-dimensional view of the rear structure of the fixed frame; Figure 3 This is a rear-view three-dimensional structural diagram of the main stone structure; Figure 4This is a three-dimensional view of the rear structure of the back panel; Figure 5 This is a rear-view perspective view of the fastening assembly. Figure 6 This is a three-dimensional structural diagram of the horizontal keel; Figure 7 This is a rear-view perspective view of the fall arrestor assembly.

[0016] Figure label: 1. Fixed frame; 101. Outer panel; 2. Stone body; 201. Expansion bolt; 202. Washer 1; 203. Fastening nut 1; 204. Fixing port; 3. Back panel; 301. Fixing hole; 302. Limiting plate; 3021. Arc-shaped opening; 4. Fastening components; 401. Adapter bracket; 402. Mounting screw; 403. Washer 2; 404. Fastening nut 2; 405. Reinforcing triangular plate; 406. Sliding port; 407. Fastening bolt; 408. Washer 3; 409. Fastening nut 3; 5. Horizontal keel; 501. Mounting hole; 6. Anti-fall component; 601. Fixing block; 602. Column; 603. Limiting frame; 6031. Slot. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Specific Implementation Example 1

[0018] Please see Figure 1-6 As shown, the present invention is an adjustable double-locking stone curtain wall structure, including a fixed frame 1, a stone body 2, a back panel 3, fastening components 4, and horizontal keel 5. The fixed frame 1 is a rectangular frame structure, and the stone body 2 is fixedly installed on its rear side. The stone body 2 serves as the main decorative panel of the curtain wall, and its rear side is flush with the rear side of the fixed frame 1 to ensure a flat surface after installation. Two expansion bolts 201 are symmetrically fixed on the upper rear side of the stone body 2. The heads of the expansion bolts 201 are embedded in the stone body 2, and the screws of the expansion bolts 201 extend from the rear side of the stone body 2 to pass through the back panel 3 and provide a locking foundation.

[0019] Please see Figure 1-3As shown, the back plate 3 is a flat metal component with two symmetrical through-holes 301. The threaded portions of the two expansion bolts 201 pass through the corresponding fixing holes 301, allowing the back plate 3 to be movably connected to the stone body 2. Each expansion bolt 201 has two washers 202 fitted on its threaded portion. The washers 202 are annular metal washers. The two washers 202 on the same expansion bolt 201 are located on both sides of the back plate 3. The washer 202 located on the front side of the back plate 3 is... The gasket 202, located on the rear side of the stone body 2 and the front surface of the back plate 3, abuts against the rear surface of the back plate 3 and the fastening nut 203. The end of the screw away from the stone body 2 is screwed with the fastening nut 203. The fastening nut 203 is pressed against the gasket 202 located behind the back plate 3. By tightening the fastening nut 203, the back plate 3 and the stone body 2 are fixed as a whole, so that the load of the stone body 2 is transmitted to the back plate 3 through the expansion bolt 201.

[0020] Please see Figure 1 , 4 As shown in Figure 5, a limiting plate 302 is fixed on the side of the back plate 3 away from the stone body 2. The limiting plate 302 is a flat plate component that is vertically fixed to the back plate 3. Two vertically penetrating arc-shaped openings 3021 are symmetrically opened on the limiting plate 302. The arc-shaped openings 3021 are long arc-shaped holes with their arc direction in the front-back direction, providing a range of movement in the front-back direction and the deflection direction for the mounting screws 402. The fastening component 4 includes a transition bracket 401 and mounting screws 402. The transition bracket 401 is a metal bracket piece with its end bent into an L shape. Two mounting screws 402 are symmetrically fixed to the top of the vertical part of the transition bracket 401. The mounting screws 402 are vertically arranged studs. The two mounting screws 402 pass through the two arc-shaped openings 3021 on the limiting plate 302, thereby hanging the back plate 3 and the stone body 2 on the transition bracket 401.

[0021] Please see Figure 1 , 3As shown in Figure 5, the fastening assembly 4 also includes a second washer 403 and a second fastening nut 404. The second washer 403 is an annular metal washer, and the second fastening nut 404 is a hexagonal nut. A first washer 202 is fitted onto the mounting screws 402 above and below the limiting plate 302. The first washer 202 above the limiting plate 302 abuts against the top surface of the limiting plate 302 and the upper second fastening nut 404, while the first washer 202 below the limiting plate 302 abuts against the bottom surface of the limiting plate 302 and the lower fastening nut. Between the two 404, fastening nuts 404 are screwed onto the mounting screws 402 above and below the limiting plate 302. Two washers 403 are located between the two fastening nuts 404. The washers 403 are used to fill the gap between the limiting plate 302 and the fastening nuts 404 and increase the contact area. By loosening or tightening the two fastening nuts 404, the axial position of the limiting plate 302 on the mounting screws 402 can be adjusted, thereby realizing the height adjustment of the fixing frame 1 and the stone body 2.

[0022] Please see Figure 1 , 5 As shown in Figure 6, the adapter bracket 401 is installed on the top of the horizontal keel 5. The horizontal keel 5 is an L-shaped metal keel profile, serving as the main horizontal support component of the entire structure. The fastening assembly 4 also includes a reinforcing triangular plate 405 and a sliding opening 406. The reinforcing triangular plate 405 is a right-angled triangular plate. The reinforcing triangular plate 405 is fixed at the two inner edges of the adapter bracket 401. The two right-angled sides of the reinforcing triangular plate 405 are welded and fixed to the vertical and horizontal parts of the adapter bracket 401, respectively, to enhance the L-shape of the adapter bracket 401. To enhance structural strength at the corner and prevent deformation under stress, the bottom of the horizontal portion of the reinforced triangular plate 405 is symmetrically provided with two vertically penetrating sliding openings 406. The sliding openings 406 are elongated through slots, with their length direction set along the front-to-back direction, providing adjustment stroke for the fastening bolts 407 in the front-to-back direction. The top of the horizontal keel 5 is symmetrically provided with two through mounting holes 501 at the corresponding positions of the adapter bracket 401. The mounting holes 501 are round holes, which correspond vertically to the sliding openings 406 and are used to pass through the fastening bolts 407.

[0023] Please see Figure 1 , 5As shown, the fastening assembly 4 also includes a fastening bolt 407, a washer 408, and a fastening nut 409. The fastening bolt 407 is a hexagonal head bolt, the washer 408 is an annular metal washer, and the fastening nut 409 is a hexagonal nut. A fastening bolt 407 is vertically inserted into each sliding port 406. The fastening bolt 407 passes through the mounting hole 501 and the sliding port 406 from bottom to top. The threaded part of the fastening bolt 407 extends from above the horizontal part of the adapter bracket 401. The fastening nut 409 is screwed onto the upper part of the threaded part. The washer 408 is fitted onto the threaded part below the fastening nut 409. The washer 408 presses against the top surface of the horizontal part of the adapter bracket 401. By tightening the fastening nut 409, the horizontal part of the adapter bracket 401 can be pressed and fixed to the top of the horizontal keel 5.

[0024] Please see Figure 1-3 As shown, an outer panel 101 is fixed to the front side of the inside of the fixed frame 1. The outer panel 101 is a flat decorative panel, which is fixed to the back side of the stone body 2. The outer panel 101 plays an external decorative and protective role for the stone body 2, and together with the stone body 2, it forms the filling layer inside the fixed frame 1.

[0025] The operation process of this embodiment is as follows: After drilling the corresponding mounting holes 501 vertically through the horizontal part of the horizontal keel 5, first, put a washer 202 on the position where the two expansion bolts 201 are exposed on the stone body 2. Then, align the fixing hole 301 on the back plate 3 with the threaded part of the expansion bolt 201 and press it onto the washer 202. Then, put another washer 202 on the threaded part of the two expansion bolts 201. Screw the fastening nut 203 onto the threaded part of the expansion bolt 201 and tighten it, so that the back plate 3 and the stone body 2 are fixed together. Next, place the adapter bracket 401 on top of the horizontal keel 5, aligning the sliding port 406 of the horizontal part of the adapter bracket 401 with the mounting hole 501 on the horizontal keel 5. Pass the fastening bolt 407 from bottom to top through the mounting hole 501 and the sliding port 406, put on the washer 3 408 and pre-tighten the fastening nut 3 409. At this time, the entire fixing frame 1 and the stone body 2 can be slid back and forth within the range of the sliding port 406 to determine the front and rear installation positions. After the positions are determined, tighten the fastening nut 3 409 completely to lock the adapter bracket 401 onto the horizontal keel 5. Specific Implementation Example 2

[0026] Please see Figure 1 , 2 As shown in Figures 6 and 7, based on the first specific embodiment, a fixing port 204 is symmetrically opened on the rear side of the stone body 2. The fixing port 204 is a circular blind hole located below the fastening component 4 and is used to fix the fixing block 601 of the anti-fall component 6. The anti-fall component 6 is symmetrically arranged in the horizontal keel 5 at both ends of the fastening component 4. The anti-fall component 6 provides additional anti-detachment restraint when there is vibration or loosening of the connection, forming a double insurance.

[0027] Please see Figure 1 , 7 As shown, the fall protection component 6 includes a fixing block 601, a column 602, and a limiting frame 603. The fixing block 601 is a rectangular block component, the column 602 is a vertically arranged column component, and the limiting frame 603 is a U-shaped frame component. The front ends of the fixing blocks 601 of the two fall protection components 6 are respectively fixed in two fixing holes 204 on the rear side of the stone body 2. The fixing blocks 601 are fixed in the fixing holes 204 by interference fit or adhesive, so that the fall protection component 6 and the stone body 2 form a rigid connection. Each fixing block 601 has a column 602 fixed to its top. The column 602 extends vertically upward. A limit frame 603 is fixed to the top of the column 602. A slot 6031 is opened in the middle of the rear side of the limit frame 603. The slot 6031 is a horizontally penetrating U-shaped groove. The limit frame 603 is locked onto the horizontal keel 5 through the slot 6031. The horizontal part of the horizontal keel 5 is embedded in the slot 6031, realizing the sliding engagement between the limit frame 603 and the horizontal keel 5. The horizontal keel 5 is fixed on the vertical keel on the outside of the wall.

[0028] Please see Figure 1 , 2 As shown in Figures 5 and 7, during the installation process, the limiting bracket 603 is secured to the horizontal part of the horizontal keel 5 via the slot 6031. Together with the fixing block 601 and the column 602, it plays a guiding and limiting role when the fixed frame 1 and the stone body 2 are sliding, ensuring that the stone body 2 does not shift laterally during the sliding process. When the structure is subjected to vibration or the fasteners become loose, the locking relationship between the limiting bracket 603 and the horizontal keel 5 provides an additional constraint force independent of the fastening component 4. When the connection of the adapter angle bracket 401 or the fastening bolt 407 fails, the anti-fall component 6 can still hold the stone body 2 and the fixed frame 1 on the horizontal keel 5. By hooking the horizontal part of the horizontal keel 5 through the slot 6031 of the limiting bracket 603, the entire component is prevented from falling, thus achieving double insurance anti-fall protection.

[0029] The operation process of this embodiment is as follows: the front end of the fixing block 601 is fixed in the fixing port 204 on the rear side of the stone body 2, the slot 6031 on the limiting frame 603 is snapped into the horizontal part of the horizontal keel 5, and then the fastening component 4 and the horizontal keel 5 are connected according to the steps of the first embodiment. When the sliding fixing frame 1 and the stone body 2 are adjusted to adjust the front and rear positions, the limiting frame 603 slides synchronously along the horizontal part of the horizontal keel 5, which plays a guiding and limiting role. Specific Implementation Example 3

[0030] Please see Figure 1 , 4As shown in Figure 5, based on the second specific embodiment, the stone curtain wall structure achieves bidirectional adjustment of height and angle through the cooperation of the mounting screw 402 and the arc-shaped opening 3021 and the adjustment of the fastening nut 404. The two symmetrically opened arc-shaped openings 3021 on the limiting plate 302 provide the mounting screw 402 with a range of movement in the front-back direction and the deflection direction. The mounting screw 402 can slide along the arc trajectory within the arc-shaped opening 3021, and can also make a small range of position adjustments in the vertical direction of the arc-shaped opening 3021.

[0031] Please see Figure 1 , 4 As shown in Figure 5, when it is necessary to adjust the height of the entire fixed frame 1 and the stone body 2, first loosen the fastening nuts 404 on the two mounting screws 402 located above the limiting plate 302, so that the limiting plate 302 is not under pressure. Then rotate the fastening nuts 404 on the two mounting screws 402 located below the limiting plate 302. The lower fastening nuts 404 rise or fall along the thread axis of the mounting screws 402. The lower fastening nuts 404 push the limiting plate 302 to rise or fall along the axis of the mounting screws 402, thereby driving the back plate 3 and the entire fixed frame 1 and the stone body 2 to rise and fall synchronously, so as to achieve the purpose of adjusting the height. The two washers 202 on the mounting screws 402 protect the upper and lower surfaces of the limiting plate 302 from direct wear by the fastening nuts 404.

[0032] Please see Figure 1 , 4 As shown in Figure 5, when it is necessary to adjust the deflection angle of the fixed frame 1 and the stone body 2, after loosening the fastening nut 404 located above the limiting plate 302, the fixed frame 1 is rotated as a whole. The fixed frame 1 drives the back plate 3 and the limiting plate 302 to rotate synchronously, so that the two mounting screws 402 slide along the arc trajectory in the corresponding arc-shaped openings 3021 respectively. Utilizing the arc guiding effect of the arc-shaped openings 3021, the limiting plate 302 deflects relative to the mounting screws 402 in the vertical direction, thereby driving the fixed frame 1 and the stone body 2 to deflect in the vertical direction. When the vertical direction is deflected at a certain angle, during the deflection process, the two mounting screws 402 slide within the two arc-shaped openings 3021 respectively. The arc-shaped direction of the arc-shaped openings 3021 limits the maximum angle range of the deflection. After the angle is adjusted to the correct position, the two previously loosened fastening nuts 404 are tightened again, clamping and fixing the limiting plate 302 between the two fastening nuts 404. At the same time, the second washer 403 is pressed against the surface of the limiting plate 302. The elastic deformation of the second washer 403 generates anti-loosening friction force, locking the adjusted height and angle position.

[0033] The operation process of this embodiment is as follows: When the height needs to be adjusted, first loosen the fastening nuts 404 on the two mounting screws 402 located above the limiting plate 302, and then rotate the fastening nuts 404 on the two mounting screws 402 located below the limiting plate 302 to make the limiting plate 302 rise and fall along the mounting screws 402 until the fixed frame 1 and the stone body 2 reach the required height. When the deflection angle needs to be adjusted, keep the upper fastening nuts 404 in the loose state, rotate the fixed frame 1 as a whole, and make the mounting screws 402 slide in the arc-shaped opening 3021 until the fixed frame 1 and the stone body 2 reach the required deflection angle. After the height and angle adjustment is completed, tighten the fastening nuts 404 on the two mounting screws 402 located above the limiting plate 302 to make the limiting plate 302 clamped and fixed.

[0034] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0035] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. Adjustable back-bolt double-safety stone curtain wall structure, including: Fixed frame (1) and stone body (2): The stone body (2) is fixed in the rear part of the fixed frame (1). The rear side of the stone body (2) is flush with the rear side of the fixed frame (1). Expansion bolts (201) are symmetrically fixed in the upper part of the rear side of the stone body (2). The screw part of the expansion bolt (201) extends out of the rear side of the stone body (2). Back plate (3): The screw parts of the two expansion bolts (201) are movably connected to the back plate (3). A limiting plate (302) is fixed on the side of the back plate (3) away from the stone body (2). An arc-shaped opening (3021) is symmetrically and vertically opened in the limiting plate (302). Fastening assembly (4): The fastening assembly (4) includes an adapter bracket (401) and mounting screws (402). The end of the adapter bracket (401) is L-shaped. The top of the vertical part of the adapter bracket (401) is symmetrically fixed with mounting screws (402). The two mounting screws (402) pass through two arc-shaped openings (3021) respectively. Horizontal keel (5) and anti-fall component (6): The bottom of the fastening component (4) is provided with a horizontal keel (5), and anti-fall components (6) are symmetrically arranged inside the horizontal keels (5) at both ends of the fastening component (4). The horizontal keel (5) is arranged in an L shape.

2. The adjustable back-bolt double-safety stone curtain wall structure according to claim 1, characterized in that: An outer panel (101) is fixed to the front of the fixed frame (1), and the outer panel (101) is fixed to the rear side of the stone body (2).

3. The adjustable back-bolt double-safety stone curtain wall structure according to claim 1, characterized in that: The back plate (3) has symmetrical through holes (301), and the screw part of the expansion bolt (201) passes through the through hole (301). The stone body (2) has symmetrical through holes (204) on the rear side. The through holes (204) are located below the fastening assembly (4). Each screw part of the expansion bolt (201) is movably connected to two washers (202).

4. The adjustable back-bolt double-safety stone curtain wall structure according to claim 3, characterized in that: Two washers (202) on the same expansion bolt (201) are placed on both sides of the back plate (3), and a fastening nut (203) is threaded to the end away from the stone body (2). The fastening nut (203) abuts against the end of a washer (202) located at the rear away from the back plate (3).

5. The adjustable back-bolt double-safety stone curtain wall structure according to claim 1, characterized in that: The fastening assembly (4) further includes a second washer (403) and a second fastening nut (404). The mounting screws (402) at the top and bottom of the limiting plate (302) are movably connected to the periphery of a first washer (202). The mounting screws (402) at the top and bottom of the limiting plate (302) are movably connected to the periphery of a second fastening nut (404). The two second washeres (403) are disposed between the two second fastening nuts (404).

6. The adjustable back-bolt double-safety stone curtain wall structure according to claim 5, characterized in that: The fastening assembly (4) also includes a reinforcing triangular plate (405) and a sliding port (406). The reinforcing triangular plate (405) is fixed at the two edges on the inner side of the adapter bracket (401). The bottom of the horizontal part of the reinforcing triangular plate (405) is vertically and symmetrically provided with a sliding port (406).

7. The adjustable back-bolt double-safety stone curtain wall structure according to claim 6, characterized in that: The adapter bracket (401) is set on the top of the horizontal keel (5). The top of the horizontal keel (5) is symmetrically provided with a mounting hole (501) corresponding to the position of the adapter bracket (401). The mounting hole (501) corresponds to the position of the sliding port (406).

8. The adjustable back-bolt double-safety stone curtain wall structure according to claim 7, characterized in that: The fastening assembly (4) further includes a fastening bolt (407), a washer (408), and a fastening nut (409). Each sliding port (406) is vertically inserted with a fastening bolt (407). The fastening nut (409) is threaded around the bolt portion of the fastening bolt (407) above the top of the horizontal part of the adapter (401). The washer (408) is movably connected around the bolt portion of the fastening bolt (407) at the bottom of the fastening nut (409). The washer (408) is located at the top of the horizontal part of the adapter (401).

9. The adjustable back-bolt double-safety stone curtain wall structure according to claim 2, characterized in that: The fall protection component (6) includes a fixing block (601), a column (602) and a limiting frame (603). The front ends of the fixing blocks (601) of the two fall protection components (6) are respectively fixed in the fixing openings (204) on the rear side of the two stone bodies (2). Each fixing block (601) has a column (602) fixed at the top. The top of the column (602) has a limiting frame (603) fixed at the top. The limiting frame (603) has a slot (6031) in the middle of the rear side. The limiting frame (603) is movably connected in the horizontal keel (5). The horizontal part of the horizontal keel (5) is movably connected in the slot (6031).

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