An assembled adjustable protective fence for municipal works

Abstract

The utility model discloses a kind of municipal engineering with adjustable protective fence of assembly, including stand, adjusting assembly, assembly component, stand is equipped with two groups and two groups between being equipped with support column, support column is connected with two groups of stand between fence for realizing construction area and external environment physical separation, adjusting assembly is located in stand, by the screw rod of adjusting assembly and the protective fence in fence form transmission cooperation, drive protective fence along stand axial realization steady lifting, assembly component is located in stand side, for realizing the quick positioning butt joint between adjacent fence and firm fixation, improve the assembly efficiency and connection reliability of fence whole, by the screw rod transmission structure of adjusting assembly, protective fence can along stand axial steady lifting, can be accurately adjusted according to construction depth, height difference of surrounding environment protection height, effectively solve the problem that traditional fixed fence is caused by specification fixed and protects surplus or insufficient, improve protection pertinence and resource utilization rate.

Description

Technical Field

[0001] This utility model belongs to the field of protective fence technology, specifically relating to an adjustable protective fence for municipal engineering. Background Technology

[0002] In the process of municipal engineering construction, protective fences are an indispensable infrastructure to ensure the safety of the construction area and isolate the work space from the external environment.

[0003] Existing traditional protective fences are mostly fixed structures, with parameters such as height and span fixed during manufacturing. They cannot be flexibly adjusted according to on-site construction conditions. Municipal engineering projects cover various types, including urban road repair, underground pipeline laying, and greening renovation. The protective needs of fences vary significantly in different construction scenarios. For example, during temporary construction on main urban roads, fences need to have a large protective height to prevent pedestrians from accidentally entering. However, in small-scale maintenance work next to sidewalks, fences that are too high can actually affect pedestrian passage and visibility. Traditional fixed fences, due to their fixed specifications, cannot be adjusted to meet these differentiated needs, often resulting in over-protection leading to resource waste or insufficient protection causing safety hazards. Utility Model Content

[0004] The purpose of this utility model is to provide an adjustable protective fence for municipal engineering projects, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an adjustable, assembled protective fence for municipal engineering, comprising:

[0006] The column is provided in two sets with a support column between the two sets. The support column is connected to the two sets of columns by a fence to physically separate the construction area from the external environment.

[0007] An adjustment component, located inside the column, can dynamically adjust the protection range of the fence according to the construction depth and the height difference of the surrounding environment. The screw of the adjustment component forms a transmission connection with the guardrail inside the fence, driving the guardrail to rise and fall smoothly along the axial direction of the column, thereby flexibly adjusting the protection height of the fence to adapt to the protection needs under different working conditions.

[0008] The assembly component, located on one side of the post, is used to enable rapid positioning, docking, and secure fixing between adjacent fences, thereby improving the overall assembly efficiency and connection reliability of the fence.

[0009] The protective cloth is rolled up inside the guardrail. When the guardrail rises along the axial direction of the column, the protective cloth unfolds, which can effectively block dust, gravel and other debris from spreading outward from the construction area, while preventing external personnel or animals from entering the construction area through gaps.

[0010] Preferably, the fence has a slot for raising and lowering the guardrail, the guardrail is slidably connected in the slot, the column has a transmission groove for accommodating the transmission components, the transmission groove has a servo motor that provides driving force, the lead screw is rotatably connected in the transmission groove through a bearing, and the output shaft of the servo motor is connected to the lead screw, forming a power source for driving the raising and lowering of the guardrail, providing the movement space and power source for raising and lowering the guardrail, and ensuring stable raising and lowering drive.

[0011] Preferably, a transmission block is connected to one side of the bottom of the guardrail. One end of the transmission block moves through a movable groove provided inside the guardrail and forms a transmission engagement with the lead screw through the lead screw nut. A sliding rod that provides guidance and limitation is also connected inside the transmission groove. One end of the transmission block is slidably sleeved on the sliding rod to limit the transmission block from rotating synchronously with the lead screw, thereby realizing the transmission engagement between the lead screw and the guardrail. At the same time, the guidance and limitation ensure that the guardrail can be raised and lowered smoothly without rotating.

[0012] Preferably, the other side of the guardrail is connected to an auxiliary sliding roller, one end of which is rolled to the inner wall of the guardrail to reduce frictional resistance. A number of positioning holes are evenly distributed on one side of the guardrail. The roller reduces the friction of the guardrail's lifting and lowering, and the positioning holes provide a basis for the guardrail's positioning.

[0013] Preferably, the top of the fence is connected to a limiting plate that supports the positioning component. The limiting plate is provided with a limiting rod, one end of which can be inserted into a limiting hole to lock the position of the guardrail after it is raised or lowered. By cooperating with the limiting rod and the limiting hole, the guardrail can be accurately locked after it is raised or lowered.

[0014] Preferably, the assembly component includes a fixing block for docking, the fixing block having two sets, each connected to one set of columns, the fixing block having a slot in the middle for the docking component to be inserted, providing a basic structure for docking of adjacent fences, and providing insertion space for the docking component through the slot.

[0015] Preferably, another set of columns is connected to two sets of mating connecting blocks. The middle of the connecting block is connected to an insert block that fits the slot. Both the fixing block and the insert block are provided with fixing holes for fastening components to pass through. After the insert block is inserted into the slot, it is screwed together by bolts and nuts that pass through the fixing holes to achieve rigid fixation between the fixing block and the connecting block. Through the mating of the insert block and the slot and the tightening of the bolts and nuts, the rigid connection and fixation of adjacent fences are achieved.

[0016] Preferably, both the uprights and the support columns are connected to support feet at their bottoms to enhance stability. The support feet are rotatably connected to casters that facilitate overall movement. The support feet enhance the stability of the fence, while the casters enable the fence to move flexibly as a whole.

[0017] Preferably, a winding roller is rotatably connected inside the guardrail via a bearing, and the protective cloth is wound onto the winding roller. A guide rod is connected inside the top of the guardrail, and several collars are connected to the top of the protective cloth, with the collars slidably fitted onto the guide rod. The winding roller is connected inside the guardrail via a bearing for winding the protective cloth, and the top guide rod cooperates with the collars on the protective cloth to achieve sliding guidance of the protective cloth.

[0018] Preferably, the top of the guardrail is rotatably connected to a turntable and the bottom of the turntable is connected to a take-up roller. One end of the protective cloth is connected to two sets of pins and the pins are inserted into the limiting holes. The turntable at the top of the guardrail is connected to the take-up roller to drive it to rotate, and the pins at one end of the protective cloth are inserted into the limiting holes to fix the position.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] (1) By adjusting the screw drive structure of the component, the guardrail can be raised and lowered smoothly along the column axis. The guardrail height can be precisely adjusted according to the construction depth and the height difference of the surrounding environment, effectively solving the problem of excessive or insufficient protection caused by the fixed specifications of traditional fixed fences, and improving the protection targeting and resource utilization rate.

[0021] (2) The assembly components adopt the matching structure of the fixed block and the connecting block, as well as the slot, and are fixed with bolts and nuts to realize the rapid docking and disassembly of adjacent fences, which can greatly shorten the construction preparation time, reduce manpower input, and improve assembly efficiency.

[0022] (3) The guardrail is slidably connected in the groove of the fence, and with the guide of the sliding rod and the auxiliary support of the roller, it ensures that the lifting process is smooth and without shaking. After the adjustment is in place, the limiting rod can be inserted into the limiting hole to further lock the position of the guardrail and prevent accidental displacement.

[0023] (4) When the protective cloth on the guardrail is unfolded, it can form a physical barrier, effectively blocking the spread of dust, gravel, and splashes from the construction area, reducing pollution to the surrounding environment. It is especially suitable for construction scenarios near urban main roads and residential areas, reducing interference to pedestrians and vehicles. When not in use, the protective cloth is rolled up inside the guardrail, without occupying extra storage space, and does not affect the movement and assembly of the fence, which helps to optimize the layout of the construction site and reduce the space occupation when the equipment is idle. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of this utility model;

[0025] Figure 2 This is a cross-sectional view of the present invention;

[0026] Figure 3 This is a schematic diagram of the structure of the protective railing of this utility model;

[0027] Figure 4 This is a schematic diagram of the structure of the protective fabric of this utility model after it has been unfolded.

[0028] Figure 5 This is a schematic diagram of the structure of the limiting plate and limiting rod of this utility model;

[0029] Figure 6 This is a schematic diagram of the structure of the fixing block and connecting block of this utility model;

[0030] Figure 7 This is a schematic diagram of the structure after the fixing block and the connecting block of this utility model are fixed together by bolts.

[0031] In the diagram: 1. Column; 2. Support column; 3. Fence; 4. Lead screw; 5. Guardrail; 6. Slot; 7. Servo motor; 8. Transmission block; 9. Slide rod; 10. Roller; 11. Limiting hole; 12. Limiting plate; 13. Limiting rod; 14. Fixing block; 15. Slot; 16. Connecting block; 17. Insert block; 18. Fixing hole; 19. Bolt; 20. Nut; 21. Support foot; 22. Caster wheel; 23. Protective cloth; 24. Turntable; 25. Guide rod; 26. Collar; 27. Pin; 28. Take-up roller. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed", "equipped with", "sleeved with", "connected", etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0034] This utility model provides, for example Figure 1-7 An adjustable, modular protective fence for municipal engineering projects, as shown, includes:

[0035] The column 1 has two sets of columns and a support column 2 between the two sets. The support column 2 is connected to the two sets of columns 1 by a fence 3 for physically separating the construction area from the external environment.

[0036] An adjustment component is installed inside the column 1. It can dynamically adjust the protection range of the fence 3 according to the construction depth and the height difference of the surrounding environment. The screw 4 of the adjustment component forms a transmission cooperation with the guardrail 5 inside the fence 3, driving the guardrail 5 to rise and fall smoothly along the axis of the column 1, thereby flexibly adjusting the protection height of the fence 3 to adapt to the protection needs under different working conditions.

[0037] The assembly component is located on one side of the post 1 and is used to achieve rapid positioning, docking and stable fixing between adjacent fences 3, thereby improving the overall assembly efficiency and connection reliability of the fence.

[0038] The protective cloth 23 is rolled up inside the protective fence 5. When the protective fence 5 rises along the axis of the column 1, the protective cloth 23 unfolds, which can effectively block the dust, gravel and other debris in the construction area from spreading outward, and at the same time prevent external personnel or animals from entering the construction area through the gaps.

[0039] The fence 3 has a slot 6 for the guardrail 5 to move up and down. The guardrail 5 is slidably connected in the slot 6. The column 1 has a transmission groove for accommodating transmission components. The transmission groove has a servo motor 7 that provides driving force. The lead screw 4 is rotatably connected in the transmission groove through a bearing, and the output shaft of the servo motor 7 is connected to the lead screw 4, forming a power source for driving the guardrail 5 to move up and down.

[0040] A transmission block 8 is connected to one side of the bottom of the guardrail 5. One end of the transmission block 8 passes through the movable groove provided in the fence 3 and is connected to the lead screw 4 through the lead screw nut to form a transmission engagement. A sliding rod 9 is also connected in the transmission groove to provide guidance and limit. One end of the transmission block 8 is slidably sleeved on the sliding rod 9 to limit the transmission block 8 from rotating synchronously with the lead screw 4 and to maintain the stability of the movement of the guardrail 5. A telescopic dust cover is connected between the transmission block 8 and the lead screw 4. The telescopic dust cover is usually made of canvas, nylon cloth, or plastic. It is sleeved on the outside of the lead screw 4 and connected to the transmission block 8. Its working principle is that the internal pleated structure is synchronized with the movement of the transmission block 8. When the transmission block 8 moves axially up and down, the pleats of the dust cover will unfold as the transmission block 8 rises and fold as the transmission block 8 falls, always completely covering the exposed part of the lead screw 4, forming a physical barrier to prevent dust, debris and other objects from entering.

[0041] The other side of the guardrail 5 is connected to an auxiliary sliding roller 10. One end of the roller 10 is rolled to the inner wall of the fence 3 to reduce frictional resistance. A number of positioning holes 11 are evenly distributed on one side of the guardrail 5.

[0042] The top of the fence 3 is connected to a limiting plate 12 that supports the positioning component. The limiting plate 12 is provided with a limiting rod 13, one end of which can be inserted into the limiting hole 11 to lock the position of the guardrail 5 after it is raised or lowered.

[0043] The assembly component includes a fixing block 14 for docking. The fixing block 14 is provided in two sets and is connected to one of the columns 1. The fixing block 14 has a slot 15 in the middle for the docking component to be inserted.

[0044] Two sets of connecting blocks 16 are connected to another set of columns 1. A plug 17 that is adapted to the slot 15 is connected to the middle of the connecting block 16. Both the fixing block 14 and the plug 17 are provided with fixing holes 18 for fastening components to pass through. After the plug 17 is inserted into the slot 15, it is screwed to the fixing block 14 and the connecting block 16 by bolts 19 that pass through the fixing holes 18 and nuts 20, so as to achieve rigid fixation between the fixing block 14 and the connecting block 16.

[0045] Both the upright column 1 and the support column 2 are connected to the bottom of a support foot 21 to enhance stability. The bottom of the support foot 21 is rotatably connected to a caster wheel 22 to facilitate overall movement.

[0046] A winding roller 28 is rotatably connected to the guardrail 5 via bearings. The protective fabric 23 is wound onto the winding roller 28. A guide rod 25 is connected to the top of the guardrail 5. Several collars 26 are connected to the top of the protective fabric 23 and are slidably fitted onto the guide rod 25. A turntable 24 is rotatably connected to the top of the guardrail 5, and the bottom of the turntable 24 is connected to the winding roller 28. Two sets of pins 27 are connected to one end of the protective fabric 23 and are inserted into the limiting hole 11. The protective fabric 23 is made of synthetic fiber fabrics such as polyester and nylon. This type of fabric forms a fine structure through the tight interweaving of warp and weft yarns, which can ensure a certain degree of flexibility, making it easy to wind up and unwind, and can resist external tearing due to the high strength of the fibers, providing basic support for protection. Under normal circumstances, the protective fabric 23 is wound onto the winding roller 28 inside the guardrail 5. The roller 28 is connected to the inner wall of the guardrail 5 through the bearing and can rotate freely. At this time, the protective cloth 23 is in a compact roll shape, which does not occupy extra space and is convenient for the overall movement or storage of the guardrail 3. When the guardrail 5 rises along the axis of the column 1 through the adjustment component, the operator can pull a corner of the protective cloth 23 to gradually release the protective cloth 23 from the winding roller 28. Several collars 26 connected to the top of the protective cloth 23 are slidably fitted onto the guide rod 25 at the top of the guardrail 5. During the unfolding process, the collars 26 slide smoothly along the guide rod 25 to ensure that the protective cloth 23 is stretched in the vertical direction and avoids wrinkles or deviation. After the protective cloth 23 is fully unfolded, the two sets of pins 27 connected to one end are inserted into the limiting hole 11 on the side of the guardrail 5. The position of the protective cloth 23 is locked by the cooperation of the pins 27 and the limiting hole 11 to prevent it from shrinking under the action of wind or external force.

[0047] When it is necessary to rewind the protective cloth 23, first pull out the locking pin 27 in the limiting hole 11 to release the protective cloth 23 from the lock of the guardrail 5. Then, the operator rotates the turntable 24 at the top of the guardrail 5. At this time, the winding roller 28 rotates in the opposite direction with the turntable 24. The winding roller 28 drives the protective cloth 23 to wind synchronously. During the winding process, the collar 26 at the top of the protective cloth 23 slides in the opposite direction along the guide rod 25. The smooth surface of the guide rod 25 cooperates with the stainless steel collar 26 to reduce sliding resistance and ensure that the cloth shrinks in a straight line to prevent deviation. When the protective cloth 23 is completely wrapped on the winding roller 28, stop rotating the turntable 24. At this time, the protective cloth 23 returns to a tight roll and is stored inside the guardrail 5 without occupying extra space, which is convenient for subsequent movement or storage.

[0048] This municipal engineering project uses an adjustable protective fence assembly. The output shaft of the servo motor 7 inside the column 1 is connected to one end of the lead screw 4 via a coupling. The other end of the lead screw 4 is nested in a bearing seat at the top of the column 1. The inner ring of the bearing is tightly fitted with the lead screw 4, and the outer ring is fixed in the bearing seat, ensuring that the lead screw 4 can rotate stably around its own axis. When the servo motor 7 receives a control signal from an external controller, the output shaft begins to rotate, transmitting torque to the lead screw 4 via the coupling, causing the lead screw 4 to rotate synchronously with the motor output shaft. Since the transmission block 8 meshes with the helical groove of the lead screw 4 through the internal lead screw 4 nut 20, when the lead screw 4 rotates, the transmission block 8 will move linearly along the axial direction of the lead screw 4 under the push of the thread. One side of the transmission block 8 extends out of the long, movable groove opened on the side of the fence 3, and engages with the inner... The side wall is connected, and inside the fence 3, a slide rod 9 is set parallel to the screw rod 4. The two ends of the slide rod 9 are fixed to the upper and lower ends of the column 1 respectively. A circular through hole is opened on the other side of the transmission block 8. The slide rod 9 passes through the through hole, and a small gap is maintained between the inner wall of the through hole and the slide rod 9. This does not affect the movement of the transmission block 8 along the slide rod 9, but also restricts the swaying of the transmission block 8 in the horizontal direction. When the transmission block 8 moves axially under the drive of the screw rod 4, it will drive the guardrail 5 to move synchronously to adjust the protection height of the fence 3. A roller 10 is installed on one side of the guardrail 5. The rim of the roller 10 contacts the inner wall of the fence 3. When the guardrail 5 is raised or lowered, the roller 10 rotates accordingly, converting the sliding friction between the guardrail 5 and the fence 3 into rolling friction, which greatly reduces the movement resistance and makes the raising and lowering process of the guardrail 5 smoother and more stable.

[0049] The side of the guardrail 5 has multiple circular limiting holes 11 evenly distributed along its height. A movable limiting plate 12 is installed at the corresponding position on the guardrail 3. The limiting plate 12 contains a limiting rod 13 whose diameter matches the limiting hole 11. When the guardrail 5 is adjusted to the required height, the operator manually pushes the limiting rod 13, aligning it with one of the limiting holes 11 and inserting it into the hole. The operator then flips the limiting rod 13 so that it engages with a limiting groove provided in the limiting plate 12 (e.g., ...). Figure 4 (as shown), thereby restricting the vertical movement of the guardrail 5.

[0050] The sides of the posts 1 of two adjacent sets of fences 3 are respectively welded with fixing blocks 14 and connecting blocks 16. The fixing blocks 14 have rectangular slots 15 facing the connecting blocks 16. The connecting blocks 16 have rectangular inserts 17 that perfectly match the shape and size of the slots 15. The thickness of the inserts 17 is slightly less than the depth of the slots 15. During docking, the inserts 17 on the adjacent set of connecting blocks 16 are aligned with the slots 15 on the fixing blocks 14 of the other set of posts 1, and the fence 3 is pushed horizontally to gradually insert the inserts 17 into the slots 15, ensuring that the two sets of fences 3 do not shift left or right during docking. Through-hole fixing holes 18 are provided on both sides of the slots 15 of the fixing blocks 14 and at the corresponding positions of the inserts 17 on the connecting blocks 16. When the inserts 17 are fully inserted into the slots 15, the fixing blocks 14... 4. The fixing hole 18 on the connecting block 16 will be precisely aligned. At this time, the bolt 19 is inserted from one end of the fixing hole 18. After the bolt 19 passes through the fixing hole 18, the nut 20 is put on the other end. Use a wrench to turn the nut 20 so that the nut 20 is gradually tightened along the thread of the bolt 19. As the nut 20 is tightened, the bolt 19 will be subjected to axial tension, which will pull the fixing block 14 and the connecting block 16 towards the middle, so that the contact surface of the insert 17 and the slot 15 are tightly fitted, generating sufficient friction. At the same time, a preload will be generated between the threads of the bolt 19 and the nut 20 to prevent the nut 20 from loosening due to vibration or other factors during use. This will firmly connect the two adjacent fences 3 together to form an integral structure, thus completing the assembly between the two adjacent fences 3.

[0051] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An adjustable, modular protective fence for municipal engineering projects, characterized in that, include: The column (1) is provided in two sets and a support column (2) is provided between the two sets. The support column (2) is connected to the two sets of columns (1) by a fence (3) for physically separating the construction area from the external environment. Adjustment component, the adjustment component is located inside the column (1), and can adjust the protection range of the fence (3) according to the construction depth and the height difference of the surrounding environment. The screw (4) of the adjustment component is transmitted to the guardrail (5) inside the fence (3) so that the guardrail (5) can be raised and lowered smoothly along the axis of the column (1), thereby adjusting the protection height of the fence (3) to meet the protection requirements under different working conditions. Assembly components are located on one side of the column (1) and are used to enable quick docking and fixing between adjacent fences (3); The protective cloth (23) is rolled up inside the guardrail (5). When the guardrail (5) rises along the axial direction of the column (1), the protective cloth (23) unfolds, which can effectively block the dust, gravel and debris in the construction area from spreading outward.

2. The adjustable protective fence for municipal engineering as described in claim 1, characterized in that: The fence (3) has a slot (6) and the guardrail (5) is slidably connected in the slot (6). The column (1) has a transmission groove and a servo motor (7) is provided in the transmission groove. The lead screw (4) is rotatably connected in the transmission groove through a bearing and the output shaft of the servo motor (7) is connected to the lead screw (4).

3. The adjustable protective fence for municipal engineering as described in claim 2, characterized in that: The bottom side of the guardrail (5) is connected to a transmission block (8), and one end of the transmission block (8) moves through the movable groove provided in the fence (3) and is connected to the screw rod (4) by the screw rod nut. The transmission groove is also connected to a slide rod (9), and one end of the transmission block (8) is slidably sleeved on the slide rod (9).

4. The adjustable protective fence for municipal engineering as described in claim 1, characterized in that: The other side of the guardrail (5) is connected to a roller (10) and one end of the roller (10) is rolled to the inner wall of the fence (3). Several limiting holes (11) are evenly distributed on one side of the guardrail (5).

5. The adjustable protective fence for municipal engineering as described in claim 4, characterized in that: The top of the fence (3) is connected to a limiting plate (12) and a limiting rod (13) is provided inside the limiting plate (12). One end of the limiting rod (13) is inserted into the limiting hole (11).

6. The adjustable protective fence for municipal engineering as described in claim 1, characterized in that: The assembly component includes a fixing block (14), which has two sets and is connected to one set of columns (1). The fixing block (14) has a slot (15) in the middle.

7. The adjustable protective fence for municipal engineering as described in claim 6, characterized in that: Two sets of connecting blocks (16) are connected to another set of columns (1), and a plug (17) is connected to the middle of the connecting block (16). The fixing block (14) and the plug (17) are both provided with fixing holes (18). After the plug (17) is inserted into the slot (15), it is screwed together with the nut (20) through the bolt (19) that passes through the fixing hole (18) to fix the fixing block (14) and the connecting block (16).

8. The adjustable protective fence for municipal engineering as described in claim 1, characterized in that: Both the column (1) and the support column (2) are connected to support feet (21) at their bottoms, and universal wheels (22) are rotatably connected to the bottom of the support feet (21).

9. The adjustable protective fence for municipal engineering as described in claim 4, characterized in that: Inside the guardrail (5), a take-up roller (28) is rotatably connected via a bearing. The protective cloth (23) is wound onto the take-up roller (28). A guide rod (25) is connected to the top of the guardrail (5). Several collars (26) are connected to the top of the protective cloth (23), and the collars (26) are slidably fitted onto the guide rod (25).

10. An adjustable protective fence for municipal engineering as described in claim 9, characterized in that: The top of the guardrail (5) is rotatably connected to a turntable (24) and the bottom of the turntable (24) is connected to a winding roller (28). One end of the protective cloth (23) is connected to two sets of pins (27) and the pins (27) are inserted into the limiting hole (11).

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