A construction site protection screen

Abstract

The present application relates to nuclear power engineering construction protection technical field, specifically to a kind of construction engineering protective screen, including main unit, reinforcing unit, be set on positioning mechanism two for making up the blind area of protective mechanism protective layer mechanism, fixed unit, setting on the traction mechanism of protective mechanism and protective layer mechanism;By main protection structure and auxiliary protective layer structure combination, overall form the double-layer protection system of adaptation nuclear power engineering construction, can effectively make up the gap of protective screen facing construction operation area, edge gap, mesh too large etc., can effectively block small welding slag, dust, chippings etc., improve the protection effect of preventing foreign matter, preventing welding slag etc. in nuclear power construction, by quick assembly and disassembly and locking structure, improve construction efficiency and reduce labor intensity, and utilize traction tension design, make protective layer always keep flat, wrinkle-free, no shaking stable state, can further improve the continuity and reliability of protection.

Description

Technical Field

[0001] This invention relates to the field of construction protection technology for nuclear power engineering, specifically to a protective net for building engineering. Background Technology

[0002] Nuclear power projects, as infrastructure projects with extremely high requirements for safety, cleanliness, and protection standards, involve a large number of high-altitude operations, cross-operations, welding operations, and precision equipment installations during the construction of the nuclear island, conventional island, and supporting facilities. The construction site must simultaneously meet multiple protection requirements, such as preventing personnel from falling, preventing materials from falling, preventing welding slag from sparking, preventing dust from spreading, and preventing foreign objects from intruding. In particular, the requirements for FOD (focal debris) control, fire prevention and flame retardancy, and environmental protection and dust control are far more stringent than those for ordinary building construction. However, in the current construction protection of nuclear power projects, most of them still use traditional steel wire mesh, metal mesh or ordinary dense safety net as the main protective device. The function of such protective structure is relatively simple. Generally, it can only intercept falling objects such as large tools and components. It may not be able to effectively block small foreign objects such as welding slag, dust, and debris generated during some construction operations. There are certain blind spots in protection, which cannot better meet the refined protection requirements in the construction of nuclear power projects. In view of this, we propose a protective net for construction projects. Summary of the Invention

[0003] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a construction engineering protective net that can effectively solve the problems of the existing protective net having single function, obvious blind spots, inability to effectively intercept welding slag, dust and other small foreign objects, and difficulty in meeting the refined protection needs of nuclear power construction.

[0004] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a protective net for construction projects, including a main unit, a positioning mechanism, and a protective mechanism disposed on the positioning mechanism for foundation protection during nuclear power plant construction. The reinforcement unit includes a second positioning mechanism disposed on the first positioning mechanism for calibration and docking with the first positioning mechanism, and a roll-up mechanism disposed on the second positioning mechanism for compensating for blind spots in the protection of the protection mechanism. The fixing unit includes a drive mechanism disposed on the first positioning mechanism and a fixing mechanism disposed on the second positioning mechanism. The drive mechanism is used to drive the fixing mechanism to move, so as to realize the quick connection and locking of the first positioning mechanism and the second positioning mechanism. The traction mechanism is disposed on the protective mechanism and the winding mechanism, and the traction mechanism is used to traction and tension the winding mechanism in the state.

[0005] Furthermore, the positioning mechanism one includes two sets of symmetrically distributed fixed piles, and a positioning cylinder for docking with the positioning mechanism two is fixedly connected to one side of each fixed pile.

[0006] Furthermore, the top of the positioning cylinder is provided with a positioning groove for calibrating the docking direction of the two positioning mechanisms, and the inner wall of the positioning cylinder is also provided with a fixing hole for locking and fixing with the fixing mechanism.

[0007] Furthermore, the protective mechanism includes a rectangular frame fixedly connected between two sets of fixed piles, and a protective net body is fixedly connected to the inner wall of the rectangular frame.

[0008] Furthermore, the second positioning mechanism includes a take-up roller inserted into the inner wall of the positioning cylinder, and a positioning block corresponding to the positioning groove is fixedly connected to the surface of the take-up roller, with the surface of the positioning block inserted into the inner wall of the positioning groove.

[0009] Furthermore, the winding mechanism includes a protective winding layer fixedly connected to the surface of the take-up roller, and the top and bottom of the protective winding layer are fixedly connected with fixing strips for connecting to the traction mechanism.

[0010] Furthermore, the driving mechanism includes a threaded rod threaded to the inner wall of the fixed pile, a handwheel fixedly connected to the top of the threaded rod, and a push rod fixedly connected to the bottom of the threaded rod for transmission cooperation with the fixed mechanism.

[0011] Furthermore, the fixing mechanism includes a push rod slidably connected to the inner wall of the take-up roller, a spring is fixedly connected to the bottom of the push rod, and the end of the spring away from the push rod is fixedly connected to the inner wall of the take-up roller.

[0012] Furthermore, a vertical tapered rod is fixedly connected to the bottom of the push rod, and a lateral tapered rod is provided below the vertical tapered rod to drive and cooperate with the vertical tapered rod. A second spring is fixedly connected to one end of the lateral tapered rod, and the end of the second spring away from the lateral tapered rod is fixedly connected to the inner wall of the take-up roller. A fixing rod for inserting and cooperating with the fixing hole is fixedly connected to one end of the lateral tapered rod.

[0013] Furthermore, the traction mechanism includes a traction block that is fixedly connected to both the top and bottom of a rectangular frame, and the traction block is connected to a fixing strip on the protective roll layer via a traction rope.

[0014] The technical solution provided by this invention has the following advantages compared with known public technologies: This invention combines a main protective structure with an auxiliary roll structure, utilizes a positioning and calibration mechanism to achieve rapid docking and assembly, and employs a drive locking structure to achieve rapid fixing and disassembly of the main body and the reinforcing parts. At the same time, a traction tensioning structure keeps the roll flat and unfolded, forming a double-layer protection system adapted to nuclear power engineering construction. In addition to achieving the basic protection functions of conventional high-altitude fall prevention and large material interception, it effectively compensates for blind spots in protection such as gaps, edge gaps, and excessively large meshes in the protective net facing the construction area. It can effectively block fine welding slag, dust, debris, etc., and improve the protection effect against foreign objects and welding slag in nuclear power construction. With its quick assembly, disassembly and locking structure, it enables tool-free rapid installation and disassembly, adapting to the flexible operational needs of nuclear power plant construction sites, improving construction efficiency and reducing labor intensity. The traction tension design ensures that the roll layer remains flat, wrinkle-free, and stable, preventing protection failure due to roll layer loosening or skewing, and further enhancing the continuity and reliability of protection. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the main body unit and the reinforcing unit structure of the present invention; Figure 3 This is a schematic diagram of the main unit and fixing unit structure of the present invention; Figure 4 This is a schematic diagram of the reinforcing unit and fixing unit structure of the present invention; Figure 5 This is a cross-sectional view of the fixed pile and positioning cylinder of the present invention; Figure 6 This is a cross-sectional view of the winding roller of the present invention; Figure 7 For the present invention Figure 5 Enlarged schematic diagram of the structure at point A; Figure 8 For the present invention Figure 6 Enlarged schematic diagram of the structure at point B.

[0017] The labels in the diagram represent: 100, main unit; 101, positioning mechanism one; 1011, fixing stake; 1012, positioning cylinder; 1013, positioning groove; 1014, fixing hole; 102, protective mechanism; 1021, rectangular frame; 1022, protective net body; 200. Reinforcing unit; 201. Positioning mechanism two; 2011. Take-up roller; 2012. Positioning block; 202. Layer winding mechanism; 2021. Protective layer; 2022. Fixing strip; 300. Fixed unit; 301. Drive mechanism; 3011. Handwheel; 3012. Top rod; 3013. Threaded rod; 302. Traction mechanism; 3021. Traction block; 3022. Traction rope; 303. Fixed mechanism; 3031. Push rod; 3032. Spring 1; 3033. Vertical tapered rod; 3034. Lateral tapered rod; 3035. Spring 2; 3036. Fixed insertion rod. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0019] The present invention will be further described below with reference to embodiments.

[0020] like Figure 1As shown, a construction engineering protective net includes a main unit 100, including a positioning mechanism 101 and a protective mechanism 102 mounted on the positioning mechanism 101 for foundation protection in nuclear power plant construction; a reinforcing unit 200, including a positioning mechanism 201 mounted on the positioning mechanism 101 for calibration and docking with the positioning mechanism 101, and a roll-up mechanism 202 mounted on the positioning mechanism 201 to compensate for blind spots in the protective mechanism 102; and a fixing unit 300, including a driving mechanism 301 mounted on the positioning mechanism 101 and a fixing mechanism 303 mounted on the positioning mechanism 201. The driving mechanism 301 drives the fixing mechanism 303 to move, achieving rapid connection and locking between the positioning mechanism 101 and the positioning mechanism 201; and a traction mechanism 302 mounted on the protective mechanism 102 and the roll-up mechanism 202. 02. The traction mechanism 302 is used to traction and tension the roll-up mechanism 202 in the unfolded state; the main unit 100 serves as the basic load-bearing structure, including positioning mechanism one 101 and protective mechanism 102. The protective mechanism 102 is used for basic protection operations such as fall prevention, dust prevention, and splash prevention in nuclear power engineering construction. Positioning mechanism two 201 is calibrated and docked with positioning mechanism one 101. The roll-up mechanism 202 is used to make up for the blind spots of protection such as small splashes, welding slag, dust, and falling small components that the protective mechanism 102 cannot cover, forming a double-layer protection system; the drive mechanism 301 drives the fixing mechanism 303 to move, realizing the quick connection and locking of positioning mechanism one 101 and positioning mechanism two 201. The traction mechanism 302 is used to traction and tension the roll-up mechanism 202 in the unfolded state, so that the roll-up mechanism 202 remains flat and improves the overall protection stability; Specifically, refer to Figures 2 to 7 The positioning mechanism 101 includes two sets of symmetrically distributed fixing posts 1011. A positioning cylinder 1012 for docking with the positioning mechanism 201 is fixedly connected to one side of each fixing post 1011. The top of the positioning cylinder 1012 has a positioning groove 1013 for calibrating the docking direction of the positioning mechanism 201. The inner wall of the positioning cylinder 1012 also has a fixing hole 1014 for locking and fixing with the fixing mechanism 303. The protective mechanism 102 includes a rectangular frame 1021 fixedly connected between the two sets of fixing posts 1011. A protective net body 1022 is fixedly connected to the inner wall of the rectangular frame 1021; the fixed pile 1011 is made of galvanized steel pipe or aluminum alloy profile, with high structural strength and corrosion resistance, and is suitable for the nuclear power construction site environment. The positioning cylinder 1012 is fixedly connected to the inner side of the fixed pile 1011. The top of the positioning cylinder 1012 is provided with a positioning groove 1013, which is used to limit and calibrate the docking direction of the positioning mechanism 201 to ensure installation accuracy. The inner wall of the positioning cylinder 1012 is provided with a fixing hole 1014, which is used to form a plug-in locking with the fixing mechanism 303. It should be noted that the protective mechanism 102 consists of a rectangular frame 1021 fixed between two sets of fixed piles 1011 and a protective net body 1022 inside the rectangular frame 1021. The rectangular frame 1021 is made of square steel welded together, and the protective net body 1022 is made of flame-retardant dense mesh safety net. The material is halogen-free flame-retardant high-density polyethylene, and the mesh density is not less than 2000 meshes / 100cm². It has the low smoke, low toxicity, dustproof and fall-proof performance required for nuclear power construction and is used to achieve protection for conventional high-altitude operations in nuclear power construction. Specifically, refer to Figure 2 and Figure 4 The positioning mechanism 201 includes a take-up roller 2011 inserted into the inner wall of the positioning cylinder 1012. A positioning block 2012 corresponding to the positioning groove 1013 is fixedly connected to the surface of the take-up roller 2011. The surface of the positioning block 2012 is inserted into the inner wall of the positioning groove 1013. The winding mechanism 202 includes a protective winding layer 2021 fixedly connected to the surface of the take-up roller 2011. The top and bottom of the protective winding layer 2021 are fixedly connected to fixing strips 2022 for connecting with the traction mechanism 302. The take-up roller 2011 is made of aluminum alloy round tube, which is lightweight and easy to rotate and unwind. The take-up roller 2011 is inserted into the inside of the positioning cylinder 1012. The positioning block 2012 is inserted into the positioning groove 1013 to achieve circumferential limiting and prevent the take-up roller 2011 from shaking or deviating. It should be noted that the protective roll 2021 is wound on the surface of the take-up roller 2011. The material is nuclear power-specific flexible fireproof and dustproof cloth, which has the characteristics of flame retardancy, anti-aging, prevention of penetration by fine welding slag, and prevention of dust dispersion. It has uniform thickness and good flexibility. After unfolding, a gap is left between the bottom and the ground, and the top height is lower than the protective net body 1022. It is specially designed to make up for the blind spots of the lower gap, edge gap and fine splashes that are easily penetrated by the protective net body 1022. It is especially suitable for preventing FOD foreign objects, welding slag and dust diffusion in nuclear power construction. The top and bottom of the protective roll 2021 are fixedly connected to the fixing strip 2022. The fixing strip 2022 is made of plastic hard strip or thin aluminum alloy strip and is used to connect with the traction mechanism 302 to ensure the traction tension effect. Specifically, refer to Figures 3 to 6 and Figure 8The drive mechanism 301 includes a threaded rod 3013 threadedly connected to the inner wall of the fixed pile 1011. A handwheel 3011 is fixedly connected to the top of the threaded rod 3013, and a push rod 3012 for transmission cooperation with the fixed mechanism 303 is fixedly connected to the bottom of the threaded rod 3013. The fixed mechanism 303 includes a push rod 3031 slidably connected to the inner wall of the take-up roller 2011. A spring 3032 is fixedly connected to the bottom of the push rod 3031. The end of the spring 3032 away from the push rod 3031 is fixedly connected to the inner wall of the take-up roller 2011. A vertical tapered rod 3033 is fixedly connected to the bottom of the push rod 3031. A lateral tapered rod 3034 for transmission cooperation with the vertical tapered rod 3033 is provided below the vertical tapered rod 3033. A second spring 3035 is fixedly connected to one end of the lateral tapered rod 3034. One end of the lateral tapered rod 3034 is fixedly connected to the inner wall of the take-up roller 2011. One end of the lateral tapered rod 3034 is fixedly connected to a fixed insertion rod 3036 for insertion into the fixed hole 1014. The threaded rod 3013 is threadedly connected to the inner wall of the fixed pile 1011. Rotating the handwheel 3011 can drive the threaded rod 3013 and the top rod 3012 to move up and down. When the top rod 3012 moves down, it pushes the push rod 3031 to slide down, compressing the first spring 3032. The push rod 3031 drives the vertical tapered rod 3033 to move down. Through the tapered surface cooperation, the lateral tapered rod 3034 moves laterally, compressing the second spring 3035, so that the fixed insertion rod 3036 extends out and inserts into the fixed hole 1014 of the positioning cylinder 1012, completing the locking and fixing of the positioning mechanism 101 and the positioning mechanism 201. It should be noted that when the handwheel 3011 is rotated in the opposite direction, the push rod 3012 moves upward. Under the reset action of the first spring 3032 and the second spring 3035, the fixed insertion rod 3036 exits the fixed hole 1014, realizing quick disassembly. Specifically, refer to Figures 2 to 4 The traction mechanism 302 includes traction blocks 3021 fixedly connected to the top and bottom of the rectangular frame 1021. The traction blocks 3021 are connected to the fixing strips 2022 on the protective roll 2021 via traction ropes 3022. The traction blocks 3021 are fixed to the top and bottom of the rectangular frame 1021 respectively. The traction blocks 3021 are made of plastic or aluminum alloy. The traction ropes 3022 are made of flame-retardant nylon rope or stainless steel wire rope. The traction ropes 3022 connect the traction blocks 3021 to the fixing strips 2022 on the protective roll 2021. After the protective roll 2021 is unfolded, the fixing strips 2022 are tightened by the traction ropes 3022, so that the protective roll 2021 is pulled and tensioned flat, avoiding wrinkles, displacement, and excessive shaking. This ensures that the protective roll 2021 stably covers the front of the protective net body 1022, continuously filling the blind spots in the protection, and better meeting the needs of continuous, stable, and blind-spot-free auxiliary protection in nuclear power engineering construction.

[0021] The working principle of this invention is as follows: When in use, the fixing piles 1011 of the main unit 100 are first firmly installed on the nuclear power construction scaffolding, working platform or edge structure, so that the protective net body 1022 of the protective mechanism 102 forms a continuous and closed basic protective surface. Relying on the halogen-free flame-retardant high-density polyethylene material, it achieves basic protection functions such as high-altitude fall prevention, large material interception and preliminary dust prevention, meeting the conventional safety protection requirements of nuclear power construction and providing the first layer of reliable safety barrier for on-site operations. Subsequently, the reinforcing unit 200 is assembled. The take-up roller 2011 is aligned and inserted into the positioning cylinder 1012 of the positioning mechanism 101. The positioning block 2012 on the take-up roller 2011 automatically engages with the positioning groove 1013 at the top of the positioning cylinder 1012, realizing rapid positioning, circumferential limiting, and directional calibration. This prevents the take-up roller 2011 from deflecting, shaking, or misaligning, ensuring that the winding mechanism 202 and the protective mechanism 102 are precisely aligned, preventing potential hazards such as protective offset and gap leakage, and improving assembly efficiency and protective consistency. After positioning is completed, the fixed unit 300 is operated, and the handwheel 3011 of the drive mechanism 301 is rotated, which drives the threaded rod 3013 to rotate and pushes the top rod 3012 to move downward. The top rod 3012 presses down the push rod 3031 of the fixed mechanism 303, so that the push rod 3031 drives the vertical tapered rod 3033 to move downward. Through the tapered surface cooperation, the lateral tapered rod 3034 extends laterally and pushes the fixed insertion rod 3036 to be inserted into the fixed hole 1014 of the positioning cylinder 1012, thus completing the automatic locking of the positioning mechanism 101 and the positioning mechanism 201. After locking, the structure is firm, without loosening or slippage, and can withstand construction impact and wind load. By rotating the handwheel 3011 in the opposite direction, the fixing rod 3036 automatically exits the fixing hole 1014 under the reset action of the spring 3032 and the spring 3035, realizing tool-free quick disassembly. This meets the high-efficiency operation requirements of frequent opening and closing, emergency passage, equipment hoisting, and zone switching at nuclear power sites, and greatly reduces disassembly and assembly time and labor intensity. After locking, the protective roll 2021 on the take-up roller 2011 is unfolded downwards so that it flatly covers the front of the protective net body 1022. Then, the traction block 3021 and the fixing strips 2022 above and below the protective roll 2021 are pulled and fixed by the traction rope 3022 of the traction mechanism 302, so that the protective roll 2021 always maintains a stable state of tension, flatness, no wrinkles, no shaking, and no bulging, avoiding the failure of protection due to loosening, displacement, or curling of the roll. The protective roll 2021 uses nuclear power-specific flexible fireproof and dustproof cloth, which has the characteristics of flame retardancy, low smoke, anti-aging, prevention of fine welding slag penetration, and blocking of micro dust. After unfolding, it maintains a reasonable gap between the bottom and the ground, and the top height is lower than the protective net body 1022. It can accurately compensate for the lower part of the protective net body 1022, directly facing the gaps in the construction work area, edge splicing gaps, and small splashes caused by excessively large mesh, etc., to achieve precise interception of FOD micro foreign objects, welding sparks, dust, and debris. It can reduce the risk of foreign objects entering equipment systems, dust contaminating instruments, and welding slag igniting combustibles during nuclear power construction. Throughout the entire nuclear power plant construction protection process, the protective net body 1022 is responsible for the main fall prevention and protection of large components, the protective roll layer 2021 is responsible for refined reinforcement protection, the traction mechanism 302 continuously maintains the flatness and stability of the roll layer, and the fixing mechanism 303 ensures the overall connection reliability. It not only meets the general building protection safety standards, but also effectively adapts to the special requirements of nuclear power projects for fire prevention and flame retardancy, cleanliness and environmental protection, foreign object control, convenient disassembly and assembly, and no blind spots in protection.

[0022] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A protective net for construction projects, characterized in that, include, The main unit (100) includes a positioning mechanism (101) and a protective mechanism (102) installed on the positioning mechanism (101) for the foundation protection of nuclear power engineering construction. The reinforcement unit (200) includes a positioning mechanism two (201) disposed on the positioning mechanism one (101) for calibration and docking with the positioning mechanism one (101), and a roll-up mechanism (202) disposed on the positioning mechanism two (201) for compensating for the blind spots of the protection mechanism (102). The fixing unit (300) includes a drive mechanism (301) disposed on the positioning mechanism one (101) and a fixing mechanism (303) disposed on the positioning mechanism two (201). The drive mechanism (301) is used to drive the fixing mechanism (303) to move, so as to realize the quick connection and locking of the positioning mechanism one (101) and the positioning mechanism two (201). The traction mechanism (302) is disposed on the protective mechanism (102) and the roll mechanism (202). The traction mechanism (302) is used to pull and tension the roll mechanism (202) in the state.

2. The protective netting for construction projects according to claim 1, characterized in that, The positioning mechanism one (101) includes two sets of symmetrically distributed fixed piles (1011), and a positioning cylinder (1012) for docking with the positioning mechanism two (201) is fixedly connected to one side of the fixed piles (1011).

3. A protective net for construction projects according to claim 2, characterized in that, The top of the positioning cylinder (1012) is provided with a positioning groove (1013) for calibrating the docking direction of the second positioning mechanism (201), and the inner wall of the positioning cylinder (1012) is also provided with a fixing hole (1014) for locking and fixing with the fixing mechanism (303).

4. A protective net for construction projects according to claim 1, characterized in that, The protective mechanism (102) includes a rectangular frame (1021) fixedly connected between two sets of fixed piles (1011), and a protective net body (1022) is fixedly connected to the inner wall of the rectangular frame (1021).

5. A protective net for construction projects according to claim 1, characterized in that, The second positioning mechanism (201) includes a take-up roller (2011) inserted into the inner wall of the positioning cylinder (1012). The surface of the take-up roller (2011) is fixedly connected with a positioning block (2012) corresponding to the positioning groove (1013). The surface of the positioning block (2012) is inserted into the inner wall of the positioning groove (1013).

6. A protective net for construction projects according to claim 1, characterized in that, The winding mechanism (202) includes a protective winding layer (2021) fixedly connected to the surface of the take-up roller (2011), and the top and bottom of the protective winding layer (2021) are fixedly connected with fixing strips (2022) for connecting to the traction mechanism (302).

7. A protective net for construction projects according to claim 1, characterized in that, The drive mechanism (301) includes a threaded rod (3013) threaded to the inner wall of the fixed pile (1011), a handwheel (3011) fixedly connected to the top of the threaded rod (3013), and a top rod (3012) fixedly connected to the bottom of the threaded rod (3013) for transmission cooperation with the fixed mechanism (303).

8. A protective net for construction projects according to claim 1, characterized in that, The fixing mechanism (303) includes a push rod (3031) slidably connected to the inner wall of the take-up roller (2011), and a spring (3032) is fixedly connected to the bottom of the push rod (3031). The end of the spring (3032) away from the push rod (3031) is fixedly connected to the inner wall of the take-up roller (2011).

9. A protective net for construction projects according to claim 8, characterized in that, The bottom of the push rod (3031) is fixedly connected to a vertical tapered rod (3033). Below the vertical tapered rod (3033) is a lateral tapered rod (3034) that is in transmission cooperation with the vertical tapered rod (3033). One end of the lateral tapered rod (3034) is fixedly connected to a spring (3035). The end of the spring (3035) away from the lateral tapered rod (3034) is fixedly connected to the inner wall of the take-up roller (2011). One end of the lateral tapered rod (3034) is fixedly connected to a fixing rod (3036) for insertion cooperation with the fixing hole (1014).

10. A protective net for construction projects according to claim 1, characterized in that, The traction mechanism (302) includes a traction block (3021) fixedly connected to the top and bottom of a rectangular frame (1021), and the traction block (3021) is connected to the fixing strip (2022) on the protective roll layer (2021) by a traction rope (3022).

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