Protective fence for municipal construction engineering

Abstract

The invention discloses a protective fence for municipal construction engineering. The protective fence comprises a fence body and a protection and noise reduction integrated module. The fence body is composed of a left support, a right support and detachable horizontal handrails, and a mounting groove is formed between every two adjacent handrails. The protection and noise reduction integrated module is installed in the groove through a base plate, a flexible bag body filled with shear thickening fluid is arranged on the outer side of the protection and noise reduction integrated module to serve as a protection unit, and the impact self-adaptive response characteristic is achieved. A Helmholtz resonance silencer is arranged on the inner side of the noise reduction device to serve as a noise reduction unit, a water collection funnel with a flow guide piece and a one-way drainage valve is integrated at the bottom of the silencer, and cooperation of efficient targeted noise reduction and automatic drainage and water accumulation prevention is achieved. The device integrates intelligent physical protection and acoustic treatment functions, the problems that a traditional fence is single in function, noise reduction equipment is prone to failure and inconvenient to maintain are solved, and the safety and environment management level of a building construction site is remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of municipal fences, in particular to a protective fence for municipal construction projects. BACKGROUND

[0002] Construction sites of municipal construction projects usually need to set up fences to divide work areas, ensure public safety and reduce construction interference. Traditional construction fences are mostly made of metal plates, punched nets or plastic partitions, and their main functions are limited to physical isolation and simple visual shielding. However, such fences have obvious shortcomings when facing the complex working conditions commonly seen in construction sites:

[0003] Firstly, in terms of safety protection, traditional rigid fences are prone to permanent deformation or damage when subjected to accidental impacts such as flying stones and tool drops, and their protective ability is limited. Some flexible fences, due to insufficient strength, are difficult to effectively block high-speed impact objects, and neither of them can provide dynamic and reliable protection for pedestrians or vehicles inside the fence.

[0004] Secondly, in terms of noise control, mechanical equipment (such as excavators, generators, concrete mixers, etc.) on construction sites continuously produce a large amount of medium and low frequency noise, which seriously affects the surrounding environment. In the prior art, either simple sound-absorbing cotton is attached to the fence, which has limited noise reduction frequency and effect and is not durable; or a separate sound barrier is set up, resulting in large occupation area, complex installation and high cost. More troublesome is that these noise reduction structures are prone to performance degradation or even failure due to rainwater accumulation in the open environment, lacking long-term stable working ability.

[0005] In addition, traditional fences and their additional functional modules are mostly integrated or fixedly connected, and need to be replaced as a whole after partial damage, which is inconvenient for transportation, installation and maintenance, and difficult to meet the efficient and modular management requirements of modern construction projects.

[0006] Therefore, there is an urgent need in the art for a new protective fence that integrates efficient impact protection and stable noise control functions, and is easy to install and maintain, to cope with the complex environmental challenges of municipal construction sites and achieve comprehensive protection of personnel, equipment and the surrounding environment. SUMMARY

[0007] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, one object of the present application is to provide a protective fence for municipal construction projects.

[0008] The technical solution of the present application is as follows: a protective fence for municipal construction projects, characterized in that it comprises a fence body and a protective and noise reduction integrated module.

[0009] The fence body comprises a left support, a right support and a railing, a plurality of horizontal railings are detachably arranged between the left support and the right support in a vertical direction, and a mounting groove is defined between any two railings.

[0010] The protection and noise reduction integrated module comprises a base plate, a fixing member, a protection unit and a noise reduction unit, the outer side of the base plate is provided with the protection unit, the inner side of the base plate is provided with the noise reduction unit, the base plate is arranged in the mounting groove and detachably connected with the railing through the fixing member;

[0011] The protection unit comprises a capsule and a shear thickening fluid filled in the capsule, the flexible capsule is a deformable flexible capsule and is made of high-strength material;

[0012] The noise reduction unit comprises a silencer, a water collecting funnel and a drain valve, the silencer is detachably connected with the base plate, the silencer is a Helmholtz resonance silencer, the silencer is provided with a cavity and a narrow sound inlet, the water collecting funnel comprises a conical funnel cover and a vertical funnel pipe, the bottom of the cavity is provided with the funnel cover for water collection, the bottom of the funnel pipe is provided with the drain valve, the drain valve is a one-way valve, the inner wall of the funnel pipe is provided with a flow guide member, the flow guide member is used to break the surface tension of water to guide the water flow to the drain valve and simultaneously suppress the resonance of the air column in the funnel pipe.

[0013] Further, the left support and the right support are provided with mounting holes corresponding to the railings, and the left and right ends of the railings are respectively inserted into the corresponding mounting holes.

[0014] Further, the outer side of the railing is provided with a T-shaped limiting guide rail, and two limiting grooves are defined between the limiting guide rail and the railing;

[0015] In the protection and noise reduction integrated module between any two railings, the upper end of the base plate is inserted into the lower limiting groove of the upper railing, and the lower end of the base plate is inserted into the upper limiting groove of the lower railing.

[0016] Further, the fixing member is a bolt, the limiting guide rail is provided with a through hole communicating with the limiting groove, the base plate is provided with a threaded hole, and the bolt is threadedly connected with the threaded hole through the through hole.

[0017] Further, the base plate is provided with a first positioning magnet, and the limiting groove is provided with a second positioning magnet, when the base plate is inserted into the limiting groove and moved to the magnetic attraction cooperation of the first positioning magnet and the second positioning magnet, the through hole is aligned with the threaded hole.

[0018] Further, the capsule is a wear-resistant and tear-resistant TPU capsule, the shear thickening fluid is a shear thickening fluid mixed by surface modified silicon dioxide and high viscosity polydimethylsiloxane, and a sedimentation preventing agent is added in the shear thickening fluid.

[0019] Further, the muffler comprises a shell and a sound inlet pipe arranged on the shell, the shell is detachably connected with the base plate through screws, the shell is hollow inside to form the cavity, and the sound inlet pipe forms the sound inlet.

[0020] Further, an end of the sound inlet pipe is provided with a sound guide cover, the cavity is provided with a sound muffling pipe arranged coaxially with the sound inlet pipe, the sound muffling pipe has a diameter larger than that of the sound inlet pipe, and a plurality of sound muffling holes are arranged on the pipe wall of the sound muffling pipe.

[0021] Further, the funnel cover is integrally arranged with the muffler, an upper surface wall of the funnel cover forms a bottom wall of the cavity, the flow guide member is a flow guide sheet extending along the length direction of the funnel pipe, the upper end of the flow guide sheet is sharp, and a plurality of flow guide sheets are arranged on the inner wall of the funnel pipe in a non-uniform manner.

[0022] Further, the drain valve is a duckbill type one-way valve, the duckbill type one-way valve comprises a valve body and a duckbill valve flap arranged on the valve body, the valve body is fixedly arranged on the bottom of the outer side of the muffler, the duckbill valve flap cover is arranged outside the water collecting funnel, and the lower end of the funnel pipe faces the lowest part of the duckbill valve flap.

[0023] Compared with the prior art, the application has the following advantages:

[0024] 1. High degree of functional integration, one column multi-purpose: innovatively integrating intelligent impact protection based on shear thickening fluid and targeted noise reduction function based on Helmholtz resonance principle in a single module, and standardizing the installation of the module on the fence body, so that the traditional fence has the dual ability of active safety protection and sound environment governance; the "one plate two sides, function separation" configuration of the protection and noise reduction integrated module realizes the high integration of physical protection and noise control in structure and the extreme use of space, not only simplifies the overall structure, reduces the production and deployment cost, but also realizes the efficient cooperation and non-interference of the two functions.

[0025] 2. Intelligent self-adaptation of protection: the shear thickening fluid in the protection unit enables the fence to have the intelligent response characteristic of "strong when strong", which is soft and harmless under normal circumstances, and instantly hardens to provide rigid protection when encountering high-speed impact, and the safety performance is significantly better than that of traditional rigid or purely flexible fences.

[0026] 3. Efficient noise reduction and self-maintenance: The noise reduction unit efficiently absorbs typical low-frequency noise on the construction site, and through the unique "water collecting funnel + flow guide + one-way drain valve" design, it realizes automatic drainage and anti-accumulation of water in the noise reduction cavity, ensures the long-term stability of the noise reduction performance, and solves the pain point that the traditional sound insulation structure is easy to fail due to water accumulation.

[0027] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following description, or can be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and the drawings are only examples and are not drawn strictly according to scale. For those skilled in the art, other drawings can also be obtained from these drawings without creative labor:

[0029] Figure 1 is a front side schematic view of the present application;

[0030] Figure 2 is a rear side schematic view of the present application;

[0031] Figure 3 is a schematic view of the protection unit of the present application;

[0032] Figure 4 is an exploded schematic view of the base and the railing of the present application;

[0033] Figure 5 is a schematic view of the noise reduction unit of the present application;

[0034] Figure 6 is an exploded view of the noise reduction unit of the present application;

[0035] Figure 7 is a sectional view of the noise reduction unit of the present application;

[0036] Figure 8 is a perspective view of Figure 7 ;

[0037] Figure 9 is a schematic view of the water collecting funnel of the present application.

[0038] Reference signs:

[0039] 1, fence body; 11, left support; 12, right support; 13, railing; 14, limiting guide rail; 15, limiting groove;

[0040] 2, protection and noise reduction integrated module; 21, base plate; 211, screw hole; 212, first positioning magnet; 22, fixing member; 23, capsule; 24, muffler; 241, shell; 242, sound inlet pipe; 243, sound guide cover; 244, sound absorbing pipe; 25, funnel cover; 26, funnel pipe; 27, flow guide member; 28, drain valve. DETAILED DESCRIPTION

[0041] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0042] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements with the same or similar functions throughout. In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "inner", "outer", "vertical", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0043] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, and can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0044] In the description of the present application, "first feature" and "second feature" can include one or more features. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more features.

[0045] The following refers to the drawings Figures 1-9The application discloses a protective fence for municipal construction engineering.

[0046] As shown in Figure 1 and Figure 2 The fence body 1 comprises a left support 11, a right support 12 and a railing 13, a plurality of horizontal railings 13 are arranged in the up-down direction and detachably arranged between the left support 11 and the right support 12, an installation slot is defined between any two adjacent railings 13, and a plurality of protective and noise reduction integrated modules 2 are arranged in each installation slot. The modular design makes subsequent installation, transportation and local maintenance and replacement extremely convenient.

[0047] The protective and noise reduction integrated module 2 comprises a base plate 21, a fixing piece 22, a protective unit and a noise reduction unit. The base plate 21 is arranged in the installation slot and detachably connected with the railing 13 through the fixing piece 22, so that the module is quickly installed and fixed. The outer side (i.e. the side facing the outside of the construction site) of the base plate 21 is provided with the protective unit, and the inner side (i.e. the side facing the construction site) of the base plate 21 is provided with the noise reduction unit, that is, the protective and noise reduction integrated module 2 is a "one plate two sides, function separation" configuration, thereby realizing the high fusion of physical protection and noise control in structure and the extreme use of space, so that a single module becomes a complete functional unit, and the problems of complex structure, large space occupation and mutual interference caused by the need to respectively install the protective structure and the noise reduction structure in the traditional way are completely avoided.

[0048] The protective unit comprises a capsule 23 and a shear thickening fluid filled in the capsule 23. The capsule 23 is a deformable flexible capsule 23 and is made of high-strength material. The shear thickening fluid is a typical non-Newtonian fluid. In a normal state or under low-speed impact (such as personnel leaning, slight collision), the fluid remains in a low-viscosity state, so that the capsule 23 has a soft touch, provides friendly buffering and absorbs energy, and greatly reduces the risk of injury caused by rigid collision; and when subjected to high-speed and high-energy impact (such as vehicle impact, tool falling), the fluid behaves as a solid state, thereby efficiently dispersing and resisting the impact energy, providing instantaneous rigid protection for the rear personnel and equipment, and realizing the active protection mechanism of "soft overcomes hard and strong overcomes weak".

[0049] The noise reduction unit comprises a silencer 24, a water collecting funnel and a drain valve 28. The silencer 24 is detachably connected to the base plate 21. The silencer 24 is a Helmholtz resonance silencer 24, which is internally provided with a cavity and a narrow sound inlet. When the construction site typical low-frequency noise (such as the roar of the generator, the mixer) corresponding to the natural frequency of the silencer 24 is transmitted into the sound inlet pipe 242, the air column in the cavity will be excited to produce violent resonance. The sound wave is reflected and rubbed inside the cavity for many times, effectively converting the sound energy into heat energy and dissipating, so as to realize the targeted and efficient absorption of the noise of the specific frequency.

[0050] During outdoor use, when the environment is humid or it is raining, water vapor and a small amount of water droplets may enter and accumulate at the bottom of the cavity. In order to ensure the long-term stability of the noise reduction performance, the present application also designs a unique self-maintaining drainage structure.

[0051] The bottom of the cavity is provided with a funnel cover 25 for collecting water, and the bottom of the funnel pipe 26 is provided with a drain valve 28, which is a one-way valve. The inner wall of the funnel pipe 26 is provided with a flow guide 27, which has two functions. One is to break the surface tension of water and guide the condensed water or rainwater to flow smoothly to the drain valve 28 for discharge, ensuring that even a small amount of water can be smoothly guided to the bottom, avoiding the formation of a residual water film that affects the sound absorption performance. The second is to disrupt the geometry of the funnel pipe 26 and suppress the formation of a new resonance of the air column inside the funnel pipe 26, preventing the generation of secondary noise and ensuring the purity and stability of the sound absorption effect.

[0052] The collected water flows to the one-way drain valve 28 under the guidance of the funnel pipe 26. When the accumulated water reaches a certain amount and generates sufficient water pressure, it can push open the drain valve 28 and smoothly discharge the water. After the drainage is completed, the drain valve 28 is automatically closed, forming a reliable sealing barrier that can effectively prevent external dust, insects and other foreign matter from entering the cavity of the silencer 24 in the opposite direction, fundamentally solving the problem of sound absorption performance decay caused by internal water accumulation or blockage.

[0053] In some embodiments, the left support 11 and the right support 12 are provided with mounting holes corresponding to the rail 13, and the left and right ends of the rail 13 are respectively inserted into the corresponding mounting holes. This plug-in structure simplifies the assembly process of the fence as a whole, and the frame can be built without complex tools.

[0054] In some embodiments, to achieve accurate positioning and quick installation of the protective and noise reduction integrated module 2, the outer side of the railing 13 is provided with a T-shaped limiting guide rail 14, and the limiting guide rail 14 and the railing 13 define an upper and a lower limiting slot 15. In the protective and noise reduction integrated module 2 between any two railings 13, the upper end of the base plate 21 is inserted into the lower limiting slot 15 of the upper railing 13, and the lower end of the base plate 21 is inserted into the upper limiting slot 15 of the lower railing 13. The fixing member 22 is a bolt, the limiting guide rail 14 is provided with a through hole in communication with the limiting slot 15, the base plate 21 is provided with a threaded hole 211, the bolt is threadedly connected through the through hole and the threaded hole 211, and the base plate 21 is firmly locked at the installation position by cooperation of the limiting of the upper and lower limiting slots 15.

[0055] In some embodiments, to facilitate quick alignment of the threaded hole 211 during installation, the base plate 21 is provided with a first positioning magnet 212, and the limiting slot 15 is provided with a second positioning magnet. When the base plate 21 is inserted into the limiting slot 15 and moved to the magnetic attraction cooperation of the first positioning magnet and the second positioning magnet, the through hole and the threaded hole 211 are automatically aligned, at which time the bolt can be screwed in, greatly improving the installation efficiency.

[0056] In some embodiments, to ensure the durability and reliability of the protective unit, the capsule 23 is preferably a TPU (thermoplastic polyurethane) capsule 23 that is wear-resistant and tear-resistant. The shear thickening fluid is a shear thickening fluid mixed with surface-modified silicon dioxide and high-viscosity polydimethylsiloxane, and an anti-settling agent is added therein to ensure that the filler has stable performance during long-term use and does not delaminate or settle.

[0057] In some embodiments, the silencer 24 includes a housing 241 and a sound inlet pipe 242 arranged on the housing 241, and the housing 241 is detachably connected with the base plate 21 through a screw, facilitating later maintenance or replacement. The housing 241 is hollow inside to form a cavity, and the sound inlet pipe 242 forms a sound inlet.

[0058] In some embodiments, to optimize the sound reduction frequency band and effect, the end of the sound inlet pipe 242 can be provided with a sound guide cover 243 for more effectively collecting and guiding sound waves. A sound reduction pipe 244 coaxially arranged with the sound inlet pipe 242 can also be arranged in the cavity, the diameter of the sound reduction pipe 244 is greater than that of the sound inlet pipe 242, and a plurality of sound reduction holes are arranged on the pipe wall of the sound reduction pipe 244, so as to expand the sound reduction frequency range by forming a plurality of resonance cavities.

[0059] In some embodiments, the funnel cover 25 is integrally arranged with the silencer 24, the upper surface wall of the funnel cover forms a bottom wall of the cavity, and the drain valve 28 is preferably a duckbill type one-way valve including a valve body and a duckbill valve flap arranged on the valve body. The valve body is fixedly arranged on the outer side of the bottom of the silencer 24, and the duckbill valve flap cover is arranged outside the water collecting funnel. The lower end of the funnel pipe 26 is directed to the lowest part of the duckbill valve flap.

[0060] The duckbill check valve has a simple structure, a unique "no mechanical moving parts + elastic valve" design, simple structure, easy maintenance, and is suitable for the scene of the present application. However, the duckbill valve usually needs a small opening pressure, and if there is little water in the cavity, it may not be enough to form enough water pressure (especially a thin layer of water), and the surface tension of the water may also make it "stick" in the cavity, unable to push the valve open.

[0061] Based on this, the present application selects to set a water collecting funnel at the bottom of the cavity to collect water, and the lower end of the funnel pipe 26 is directed to the lowest part of the duckbill valve. In this way, even if there is only a thin layer of water film in the cavity, when these water is collected in the small funnel pipe 26 of the funnel, the water column height increases, generating a larger hydrostatic pressure at the outlet, so that this pressure is enough to overcome the small opening resistance of the duckbill valve.

[0062] In addition, the inner wall of the funnel pipe 26 is provided with a flow guide 27, which is a flow guide sheet extending along the length direction of the funnel pipe 26. The upper end of the flow guide sheet is sharp, which can effectively pierce the water surface tension film and create a preferential flow path for the water flow, ensuring that even a small amount of water can be smoothly guided to the bottom, avoiding the formation of residual water film. The inner wall of the funnel pipe 26 is provided with a plurality of flow guide sheets arranged asymmetrically around the inner wall of the funnel pipe 26. This asymmetric layout completely breaks the regular geometric shape of the funnel pipe 26, effectively inhibits the secondary resonance of the air column in the pipe, avoids the generation of secondary noise, and guarantees the purity of the acoustic performance of the main sound attenuation cavity.

[0063] In summary, the present application has the following characteristics:

[0064] 1. High integration of functions, one column multi-use: innovatively integrating intelligent impact protection based on shear thickening fluid and targeted noise reduction function based on Helmholtz resonance principle in a single module, and standardizing the installation on the fence body 1, so that the traditional fence has the dual ability of active safety protection and sound environment governance; The configuration of the protection and noise reduction integrated module 2 is "one board two sides, function separation", which realizes the high integration of physical protection and noise control in structure and the extreme use of space, not only simplifies the overall structure, reduces the production and deployment cost, but also realizes the efficient cooperation and non-interference of the two functions.

[0065] 2. Intelligent self-adaptation of protection: The shear thickening fluid in the protection unit enables the fence to have the intelligent response characteristic of "strong when strong", which is soft and harmless under normal circumstances, and provides rigid protection when subjected to high-speed impact, which is significantly superior to traditional rigid or purely flexible fences in safety performance.

[0066] 3. Efficient noise reduction and self-maintenance: The noise reduction unit efficiently absorbs typical low-frequency noise on the construction site. Meanwhile, through the unique design of "water collecting funnel + flow guide 27 + one-way drain valve 28", it realizes the automatic drainage and water accumulation prevention function of the noise reduction cavity, ensures the long-term stability of the noise reduction performance, and solves the pain point of the easy failure of traditional soundproofing structures due to water accumulation.

[0067] Although some embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, and all such changes, modifications, substitutions and alterations are intended to be within the scope of the claims of the present application.

Claims

1. A protective fence for municipal construction projects, characterized in that, include: The fence body and the integrated protection and noise reduction module; The fence body includes a left support, a right support, and railings. Several horizontal railings are detachably arranged between the left and right supports and spaced apart in the vertical direction. An installation groove is defined between any two railings, and multiple integrated protection and noise reduction modules are provided in each installation groove. The integrated protection and noise reduction module includes a base plate, a fixing component, a protection unit, and a noise reduction unit. The protection unit is provided on the outer side of the base plate, and the noise reduction unit is provided on the inner side of the base plate. The base plate is disposed in the mounting groove and is detachably connected to the railing through the fixing component. The protective unit includes a capsule and a shear-thickening fluid filled in the capsule. The flexible capsule is a deformable flexible capsule and is made of a high-strength material. The noise reduction unit includes a silencer, a water-gathering funnel, and a drain valve. The silencer is detachably connected to the substrate and is a Helmholtz resonance silencer. The silencer has a cavity and a narrow sound inlet. The water-gathering funnel includes a conical funnel cover and a vertical funnel tube. The bottom of the cavity is provided with the funnel cover for gathering water, and the bottom of the funnel tube is provided with the drain valve. The drain valve is a one-way valve. The inner wall of the funnel tube is provided with a flow guide. The flow guide is used to disrupt the surface tension of the water to guide the water flow to the drain valve and at the same time suppress the resonance of the air column in the funnel tube.

2. The protective fence for municipal construction projects according to claim 1, characterized in that, The left and right supports are provided with mounting holes corresponding to the railings, and the left and right ends of the railings are respectively inserted into the corresponding mounting holes.

3. The protective fence for municipal construction projects according to claim 1, characterized in that, The outer side of the railing is provided with a T-shaped limiting guide rail, and the limiting guide rail and the railing define two limiting grooves, one above and one below. In the integrated protection and noise reduction module between any two railings, the upper end of the base plate is inserted into the lower limiting groove of the upper railing, and the lower end of the base plate is inserted into the upper limiting groove of the lower railing.

4. The protective fence for municipal construction projects according to claim 3, characterized in that, The fixing component is a bolt, the limiting guide rail is provided with a through hole communicating with the limiting groove, the base plate is provided with a screw hole, and the bolt passes through the through hole and is threadedly connected to the screw hole.

5. The protective fence for municipal construction projects according to claim 4, characterized in that, The substrate is provided with a first positioning magnet, and the limiting groove is provided with a second positioning magnet. When the substrate is inserted into the limiting groove and moves to engage with the first positioning magnet and the second positioning magnet, the through hole is aligned with the screw hole.

6. The protective fence for municipal construction projects according to claim 1, characterized in that, The capsule is a wear-resistant and tear-resistant TPU capsule, and the shear thickening fluid is a shear thickening fluid composed of surface-modified silica and high-viscosity polydimethylsiloxane, and an anti-settling agent is added to the shear thickening fluid.

7. The protective fence for municipal construction projects according to claim 1, characterized in that, The silencer includes a housing and a sound inlet tube disposed on the housing. The housing is detachably connected to the base plate by screws. The housing is hollow to form the cavity, and the sound inlet tube forms the sound entrance.

8. The protective fence for municipal construction projects according to claim 7, characterized in that, The end of the sound inlet pipe is provided with a sound guide cover, and the cavity is provided with a silencer pipe arranged coaxially with the sound inlet pipe. The diameter of the silencer pipe is larger than that of the sound inlet pipe, and the wall of the silencer pipe is provided with a number of silencer holes.

9. The protective fence for municipal construction projects according to claim 1, characterized in that, The funnel cover and the silencer are integrally formed. The upper surface of the funnel cover forms the bottom wall of the cavity. The flow guide is a flow guide sheet extending along the length of the funnel tube. The upper end of the flow guide sheet is sharp. Multiple flow guide sheets are provided on the inner wall of the funnel tube in an uneven arrangement around the inner wall of the funnel tube.

10. The protective fence for municipal construction projects according to claim 1, characterized in that, The drain valve is a duckbill-type check valve, which includes a valve body and a duckbill valve disc disposed on the valve body. The valve body is fixedly disposed on the bottom outside of the silencer, and the duckbill valve disc covers the outside of the water-collecting funnel. The lower end of the funnel tube faces the lowest point of the duckbill valve disc.

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