CN214530773U - Cable trench firewall - Google Patents

Cable trench firewall Download PDF

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Publication number
CN214530773U
CN214530773U CN202120138650.8U CN202120138650U CN214530773U CN 214530773 U CN214530773 U CN 214530773U CN 202120138650 U CN202120138650 U CN 202120138650U CN 214530773 U CN214530773 U CN 214530773U
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China
Prior art keywords
fireproof
wall
seepage
wall body
fire
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Active
Application number
CN202120138650.8U
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Chinese (zh)
Inventor
张燕红
张燕青
董鹏飞
许艳艳
景占阁
赤建玉
孟婷
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Zhengzhou Silande New Material Technology Co ltd
Zhengzhou Zhongyuan Silande High Technology Co ltd
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Zhengzhou Silande New Material Technology Co ltd
Zhengzhou Zhongyuan Silande High Technology Co ltd
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Application filed by Zhengzhou Silande New Material Technology Co ltd, Zhengzhou Zhongyuan Silande High Technology Co ltd filed Critical Zhengzhou Silande New Material Technology Co ltd
Priority to CN202120138650.8U priority Critical patent/CN214530773U/en
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Publication of CN214530773U publication Critical patent/CN214530773U/en
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Abstract

The utility model relates to a cable pit prevents hot wall, include: the wall main part, the wall main part includes: the inner wall body and the outer wall body are distributed and formed with a middle cavity at intervals along the inner and outer transverse directions, and a plurality of fireproof bags are stacked in the middle cavity to form a fireproof covering layer; pouring an encapsulating material into the middle cavity to form a fireproof and anti-seepage encapsulating adhesive layer, wherein the fireproof and anti-seepage encapsulating adhesive layer wraps the fireproof cladding. The utility model provides an among the cable pit prevents hot wall, not only set up the fire prevention covering, guarantee sufficient fire behavior, middle wall body between the interior wall body still pours the embedment material in order to form the fire prevention and seepage prevention encapsulating adhesive layer, fire prevention and seepage prevention encapsulating adhesive layer wraps up in the fire prevention covering, fire prevention and seepage prevention encapsulating adhesive layer can provide effectual waterproof sealing, can effectively block up the gap of fire prevention package, realize sealed antiseep, prevent hot wall self and have good waterproof antiseep performance, can effectively avoid external water to cross and prevent hot wall and cause the influence to construct and inside electrical equipment thereof, safety factor is improved.

Description

Cable trench firewall
Technical Field
The utility model relates to a cable pit prevents hot wall.
Background
In electric power system's fire prevention link, the cable pit is key protection object, and when the conflagration took place, the intensity of a fire can stretch along with the cable pit, consequently, can set up hot wall in the cable pit usually to prevent the intensity of a fire to stretch.
The existing fire-proof wall is mostly made of bricks and coarse sand, and some cable ducts are made of simple fire-proof walls made of fire-proof plates, fire-proof bags and fire-proof mud. The application publication number CN1065322617A discloses a cable trench firewall, which comprises a first fireproof plate and a second fireproof plate, wherein the first fireproof plate and the second fireproof plate are corrosion-resistant and waterproof, and a plurality of fireproof bags are tightly and uniformly arranged between the first fireproof plate and the second fireproof plate.
The fireproof plate in the firewall is corrosion-resistant and waterproof, and can not block water from entering the outer side although the fireproof plate is prevented from being rotted. After the cable pit appeared intaking because of external factors the condition, water can be followed the fire prevention package gap outside of preventing or prevent that water from constantly gushing into or permeate inside the structure along fire prevention package gap or fire wall irregular edge, lead to the inside equipment foundation of structure to break down and destroy the influence because of soaking or humidity, have the potential safety hazard if electrical equipment discharges, metal structure equipment corrosion and the structure foundation sinks the fracture scheduling problem, causes the incident easily.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a cable pit prevents hot wall to solve among the prior art cable pit prevents that hot wall water-proof effects is not good to lead to the technical problem who has the potential safety hazard.
In order to achieve the above object, the utility model provides a firewall for cable trench's technical scheme is: cable pit prevents hot wall, includes:
the outer side of the wall main body is a water-facing side facing the outside, and the wall main body is provided with threading pipelines which transversely extend along the inside and the outside;
the wall main part includes:
the inner wall body and the outer wall body are distributed and formed with a middle cavity at intervals along the inner and outer transverse directions, and a plurality of fireproof bags are stacked in the middle cavity to form a fireproof covering layer;
pouring an encapsulating material into the middle cavity to form a fireproof and anti-seepage encapsulating adhesive layer, wherein the fireproof and anti-seepage encapsulating adhesive layer wraps the fireproof cladding.
The beneficial effects are that: the utility model provides an among the cable pit prevents hot wall, not only set up the fire prevention covering, guarantee sufficient fire behavior, middle wall body between the interior wall body still pours the embedment material in order to form the fire prevention and seepage prevention encapsulating adhesive layer, fire prevention and seepage prevention encapsulating adhesive layer wraps up in the fire prevention covering, fire prevention and seepage prevention encapsulating adhesive layer can provide effectual waterproof sealing, can effectively block up the gap of fire prevention package, realize sealed antiseep, prevent hot wall self and have good waterproof antiseep performance, can effectively avoid external water to cross and prevent hot wall and cause the influence to construct and inside electrical equipment thereof, safety factor is improved.
As a further improvement, the inner wall body is provided with an outer side surface facing the outer wall body, a reinforcing plate is attached to the outer side surface of the inner wall body, and the fireproof and anti-seepage pouring sealant layer is located between the outer wall body and the reinforcing plate.
The beneficial effects are that: set up the gusset plate on the lateral surface of interior wall body, can effectively improve whole hot wall intensity of preventing.
As a further improvement, the reinforcing plate is a metal plate.
The beneficial effects are that: the reinforcing plate is made of metal plates, and is convenient to process and manufacture.
As a further improvement, the reinforcing plate is fixed on the outer side surface of the inner wall body by gluing.
The beneficial effects are that: the gusset plate is fixed in an adhesive manner, so that the gusset plate is convenient to be pasted on the outer side surface of the inner wall body.
As a further improvement, the wall main part still includes flexible fire prevention spare, and flexible fire prevention spare is fire prevention cloth or fire blanket, and flexible fire prevention spare is located outer wall body and fire prevention seepage prevention pouring sealant layer, and flexible fire prevention spare has the lateral surface towards the outer wall body, and the lateral surface of flexible fire prevention spare has outer fire prevention seepage prevention perspective layer, and flexible fire prevention spare is hugged closely on the medial surface of the outer wall body and cover the medial surface of the outer wall body for outer fire prevention seepage prevention perspective layer compresses tightly the laminating in order to realize sealed antiseep on the medial surface of outer wall body.
The beneficial effects are that: the medial surface that corresponds the outer wall body has still hugged closely and has covered flexible fire prevention spare, set up outer fire prevention permeation prevention layer on the lateral surface of flexible fire prevention spare, when flexible fire prevention spare hugs closely on the medial surface of the outer wall body, outer fire prevention permeation prevention layer compresses tightly when laminating on the medial surface of outer wall body, can further improve the anti-seepage performance who prevents hot wall, and simultaneously, the direct extrusion flexible fire prevention spare of still usable fire prevention permeation prevention pouring sealant layer, the improvement is to the support of flexible fire prevention spare, the deformation that reduces flexible fire prevention spare shifts.
As a further improvement, the outer fireproof anti-permeation layer is a sealing coating.
The beneficial effects are that: and the sealing coating is adopted, so that the processing and the manufacturing are convenient.
As a further improvement, the flexible fireproof piece is provided with an inner side surface facing the inner wall body, and the inner side surface of the flexible fireproof piece is provided with an inner fireproof anti-seepage layer.
The beneficial effects are that: the inner fireproof anti-seepage layer is configured, so that the anti-seepage performance of the fireproof cloth can be improved.
As a further improvement, the inner fireproof and permeation-prevention layer is a sealing coating.
The beneficial effects are that: and the sealing coating is adopted, so that the processing and the manufacturing are convenient.
As a further improvement, the flexible fireproof piece is fixed on the inner side surface of the outer wall body through a bolt or a ribbon.
The beneficial effects are that: the flexible fireproof piece is conveniently fixed on the outer wall body through the stud or the ribbon.
As a further improvement, in the transverse direction of the inside and outside of the wall main body, the thickness of the fireproof and anti-infiltration irrigation sealing adhesive layer is larger than that of the inner wall body, and the thickness of the fireproof and anti-infiltration irrigation sealing adhesive layer is larger than that of the outer wall body.
The beneficial effects are that: the thickness of the fireproof and anti-infiltration irrigation sealing adhesive layer is set, and the waterproof performance of the fireproof wall is guaranteed.
Drawings
Fig. 1 is a schematic structural view of a cable trench firewall provided by the present invention;
fig. 2 is a schematic view of the arrangement of the firewall in the cable trench shown in fig. 1.
Description of reference numerals:
100. a cable trench; 200. a firewall; 300. a cover plate; 1. an outer wall body; 2. fireproof cloth; 21. an outer fire-proof permeation-proof layer; 22. an inner fireproof impermeable layer; 3. a fire-resistant cladding; 4. a fireproof and anti-seepage irrigation sealing adhesive layer; 5. a reinforcing plate; 6. an inner wall; 7. and (4) threading the pipeline.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention, i.e., the described embodiments are only some, but not all embodiments of the invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, elements recited by the phrase "comprising an … …" do not exclude the inclusion of such elements in processes or methods.
In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" when they are used are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from the specific situation.
In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the term "provided" may be used in a broad sense, for example, the object of "provided" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be a detachable connection or a non-detachable connection. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from the specific situation.
The present invention will be described in further detail with reference to examples.
The utility model provides a cable pit prevents hot wall's embodiment 1:
the cable pit prevents that hot wall not only plays the fire prevention effect, can also realize water seepage prevention, specifically set up fire prevention permeation prevention layer respectively in the inside and outside both sides of fire prevention cloth, and make fire prevention cloth cover the laminating on the medial surface of outer wall body, can form sealed antiseep, in addition, pouring embedment liquid glue solidification forms fire prevention infiltration prevention encapsulating glue layer in the middle chamber of wall main part, fire prevention infiltration prevention encapsulating glue layer parcel fire prevention covering, form fire prevention and waterproof sealing, and then effectively improve the water seepage prevention performance that the cable pit prevents hot wall, avoid external water to cross prevent hot wall and constitute the potential safety hazard to the electrical equipment in the structure.
The structure of the cable trench firewall is shown in fig. 1 and 2, the firewall 200 is fixed in the cable trench 100, the cover plate 300 is arranged on the top, and the threading pipe 7 is correspondingly arranged on the firewall 200 for the corresponding cable to pass through.
The specific structure of the firewall 200 is as shown in fig. 1, the firewall 200 includes a wall body, the outer side of the wall body is a water-facing side facing the outside, and the wall body is provided with a threading pipeline 7 extending transversely along the inside and outside, so as to facilitate the threading of a cable.
The wall main part specifically includes the outer wall 1, fire prevention cloth 2, fire prevention infiltration prevention encapsulating adhesive layer 4, gusset plate 5 and interior wall 6 that outside-in arranged in proper order, wherein, sets up fire prevention covering 3 in the fire prevention infiltration prevention encapsulating adhesive layer 4.
Interior wall body 6 and outer wall body 1 are concrete placement wall body, interior wall body 6 and outer wall body 1 are along inside and outside horizontal interval distribution in order to form middle chamber, a plurality of fire prevention package in order to form fire prevention covering 3 have been piled up to middle intracavity, fire prevention cloth 2 is as flexible fire prevention spare, fire prevention cloth 2 has the lateral surface towards outside wall body 1 and the medial surface towards interior wall body 6, lateral surface at fire prevention cloth 2 sets up sealing coating, in order to form outer fire prevention impervious layer 21, medial surface at fire prevention cloth 2 sets up sealing coating, in order to form interior fire prevention impervious layer 22.
During manufacturing, the inner side surface and the outer side surface of the fireproof cloth 2 can be respectively coated with organosilicon sealant to form a sealing glue layer, and an outer fireproof anti-seepage layer 21 and an inner fireproof anti-seepage layer 22 are formed on the two side surfaces of the fireproof cloth 2 due to the fireproof anti-seepage sealing performance of the organosilicon sealant.
Generally, the selected sealing material has long service life, does not damage and influence the material per se in a long-term soaking environment, does not contain a solvent, is harmless to a human body and does not pollute the environment.
During the assembly, with the medial surface of the outer wall body 1 of flameproof fabric 2 cover to make flameproof fabric 2 hug closely on the medial surface of outer wall body 1, usable peg or ribbon are fixed flameproof fabric 2 on the medial surface of outer wall body 1. And, the fire prevention anti-infiltration irrigation sealing glue layer of arranging in the middle cavity can be followed inboard extrusion fire prevention cloth 2, and fire prevention cloth 2 can hug closely on the medial surface of outer wall body 1 for outer fire prevention infiltration prevention layer 21 compresses tightly the laminating and is in order to realize sealed antiseep on the medial surface of outer wall body 1.
For the inner wall body 6, the inner wall body 6 has an outer side surface facing the outer wall body 1, a reinforcing plate 5 is attached to the outer side surface of the inner wall body 6, the reinforcing plate 5 is a metal plate, specifically, an aluminum plate can be selected, and the reinforcing plate 5 can be fixed on the outer side surface of the inner wall body 6 in an adhering manner. In the intermediate chamber, a plurality of fire-proof packs are stacked in order and closely arranged to form a fire-proof covering 3, and the fire-proof packs may be those commonly used in the art. During construction, a fireproof and impermeable encapsulating material is poured into the middle cavity to form a fireproof and impermeable encapsulating layer 4, the fireproof and impermeable encapsulating layer 4 wraps the fireproof cladding 3, namely the fireproof cloth 2 is extruded on the outer side of the fireproof and impermeable encapsulating layer 4, and the reinforcing plate 5 is extruded on the inner side. The fireproof and anti-seepage pouring sealant layer is used for carrying out irregular pouring and sealing on a special-shaped structure and a special-shaped cable wire harness, quickly pouring and sealing cavities needing to be fireproof, waterproof and anti-seepage, and forming gel to fill all seepage gaps, and concrete, cables, metal and the like have good bonding effects, and under a long-term water immersion environment, the fireproof and anti-seepage pouring sealant layer has no destructive influence on materials, does not contain solvents, is harmless to a human body, and does not pollute the environment. The encapsulating material can be a two-component curable gel fireproof material, meets the requirements of relevant national fireproof sealing standards, specifically can select a two-component polyurethane sealant disclosed in the invention patent application with the application publication number of CN110373146A, and has the performances of fire prevention, water prevention and leakage prevention.
In this embodiment, on the inside and outside horizontal of wall main part, the thickness of fire prevention infiltration-proof encapsulating adhesive layer 4 is greater than the thickness of interior wall body 6, and the thickness of fire prevention infiltration-proof encapsulating adhesive layer 4 is greater than the thickness of outer wall body 1, guarantees that fire prevention infiltration-proof encapsulating adhesive layer has enough thickness to improve the waterproof sealed effect of fire prevention.
In fact, because the fireproof and anti-seepage irrigation sealing adhesive layer is formed by pouring, an outward pushing action force can be applied to the fireproof covering layer, so that the fireproof covering layer is extruded and attached to the fireproof cloth, and the fireproof, waterproof and anti-seepage effects of the inner fireproof anti-seepage layer and the outer fireproof anti-seepage layer on the fireproof cloth are guaranteed. Moreover, the supporting strength can be improved, and the situation that the fireproof cloth deforms and shifts is avoided.
Among the fire wall that this embodiment provided, fire prevention impermeable layer and outer fire prevention impermeable layer in the both sides of fire prevention cloth set up, when being extruded at outer wall body and fire prevention impermeable sealant layer, can block water pressure, wind pressure and the intensity of a fire that external probably takes place to strike by priority. The fireproof covering layer and the fireproof anti-seepage pouring sealant layer are matched together to form a second fireproof, waterproof and anti-seepage structure, so that water permeating the fireproof cloth is secondarily blocked, and the fireproof, waterproof and anti-seepage effects of the fireproof wall are perfected. The adjacent structural layers of the firewall are mutually extruded and supported, so that mutual supplement is realized, the impact resistance is improved, and the fireproof, waterproof and anti-leakage performance of the firewall is effectively realized.
The utility model provides a cable pit prevents hot wall's embodiment 2:
the difference from example 1 is mainly that: in example 1, the fire-proof cloth was used as a flexible fire-proof member, and the fire-proof permeation-preventing layers were provided on the inner and outer sides of the fire-proof cloth, respectively. In this embodiment, the outer fireproof and impermeable layer may be disposed only on the outer side of the fireproof cloth, and the outer waterproof and impermeable performance may also be achieved.
It should be noted that in the above embodiments, the flexible fire-proof member is made of fire-proof cloth, and in other embodiments, the flexible fire-proof member may also be made of fire-proof blanket.
The utility model provides a cable pit prevents hot wall's embodiment 3:
the difference from example 1 is mainly that: in embodiment 1, the fireproof cloth is arranged between the inner wall and the outer wall, the outer fireproof impermeable layer is arranged outside the fireproof cloth, and the fireproof impermeable sealant layer is also arranged. In this embodiment, the fire-proof cloth is omitted, and only the fire-proof and anti-seepage irrigation sealant layer is arranged in the middle cavity to realize the functions of sealing and seepage prevention.
The utility model provides a cable pit prevents hot wall's embodiment 4:
the difference from example 1 is mainly that: in example 1, both the inner wall and the outer wall were concrete cast walls. In this embodiment, the inner and outer walls may be made of fire-proof boards or bricks.
The utility model provides a cable pit prevents hot wall's embodiment 5:
the difference from example 1 is mainly that: in example 1, the corresponding materials were coated on the inner and outer sides of the flameproof fabric, respectively, to form a flameproof and permeation-resistant layer. In this embodiment, the fire-proof cloth can be immersed in the corresponding material, so that the corresponding material and the fire-proof cloth are well bonded and fused together, and the functions of water resistance, seepage resistance and compressive strength can be achieved.
The utility model provides a cable pit prevents hot wall's embodiment 6:
the difference from example 1 is mainly that: in example 1, a corresponding potting material is poured between the fireproof cladding and the reinforcing plate to form a fireproof and anti-seepage potting adhesive layer, and the reinforcing plate can not only enhance the strength, but also play a role in preventing overflow. In this embodiment, the reinforcing plate may be omitted, and the corresponding potting material may be directly poured between the inner wall and the fire-proof cladding to form the fire-proof and anti-infiltration potting adhesive layer.
The utility model provides a cable pit prevents hot wall's embodiment 7:
the difference from example 1 is mainly that: in embodiment 1, the reinforcing plate is a metal plate, which is convenient for processing and manufacturing. In this embodiment, the gusset plate also can be nonmetal board, as long as satisfy sufficient strength, have good corrosion resisting property, can not cause environmental pollution.
Finally, it should be noted that the above mentioned embodiments are only preferred embodiments of the present invention, and not intended to limit the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made without inventive effort to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. Cable pit prevents hot wall, includes:
the outer side of the wall main body is a water-facing side facing the outside, and the wall main body is provided with a threading pipeline (7) extending transversely along the inside and the outside;
the wall main part includes:
the inner wall body (6) and the outer wall body (1) are distributed and formed with a middle cavity at intervals along the inner and outer directions, and a plurality of fireproof bags are stacked in the middle cavity to form a fireproof covering layer (3);
the fireproof and anti-seepage pouring sealing structure is characterized in that a pouring material is poured into the middle cavity to form a fireproof and anti-seepage pouring sealing adhesive layer (4), and the fireproof and anti-seepage pouring sealing adhesive layer (4) wraps the fireproof cladding (3).
2. The cable trench firewall according to claim 1, wherein the inner wall (6) has an outer side facing the outer wall (1), a reinforcing plate (5) is attached to the outer side of the inner wall (6), and the fireproof and anti-seepage sealant layer (4) is located between the outer wall (1) and the reinforcing plate (5).
3. Cable trench firewall according to claim 2, characterized in that the reinforcing plate (5) is a metal plate.
4. Cable trench firewall according to claim 2, characterized in that the reinforcing plate (5) is adhesively fixed on the outer side of the inner wall (6).
5. The cable trench firewall according to any one of claims 1 to 4, wherein the wall body further comprises a flexible fireproof member, the flexible fireproof member is a fireproof cloth (2) or a fireproof blanket, the flexible fireproof member is located between the outer wall body (1) and the fireproof and anti-seepage sealant layer (4), the flexible fireproof member has an outer side facing the outer wall body (1), the outer side of the flexible fireproof member has an outer fireproof anti-seepage layer (21), and the flexible fireproof member is tightly attached to the inner side of the outer wall body (1) and covers the inner side of the outer wall body (1), so that the outer fireproof anti-seepage layer (21) is tightly attached to the inner side of the outer wall body (1) to achieve sealing and anti-seepage.
6. Cable trench firewall according to claim 5, characterized in that the outer fire and permeation prevention layer (21) is a sealing coating.
7. Cable trench firewall according to claim 5, characterized in that the flexible fire protection element has an inner side facing the inner wall (6), the inner side of the flexible fire protection element having an inner fire protection and penetration prevention layer (22).
8. Cable trench firewall according to claim 7, characterized in that the inner fire and permeation prevention layer (22) is a sealing coating.
9. Cable trench firewall according to claim 5, characterized in that the flexible fire protection element is fixed on the inner side of the outer wall (1) by means of a peg or a band.
10. Cable trench firewall according to one of claims 1 to 4, characterized in that the thickness of the fire and permeation resistant sealant layer (4) is greater than the thickness of the inner wall (6) and the thickness of the fire and permeation resistant sealant layer (4) is greater than the thickness of the outer wall (1) in the inner and outer transverse directions of the wall body.
CN202120138650.8U 2021-01-19 2021-01-19 Cable trench firewall Active CN214530773U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202120138650.8U CN214530773U (en) 2021-01-19 2021-01-19 Cable trench firewall

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202120138650.8U CN214530773U (en) 2021-01-19 2021-01-19 Cable trench firewall

Publications (1)

Publication Number Publication Date
CN214530773U true CN214530773U (en) 2021-10-29

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Application Number Title Priority Date Filing Date
CN202120138650.8U Active CN214530773U (en) 2021-01-19 2021-01-19 Cable trench firewall

Country Status (1)

Country Link
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116047694A (en) * 2023-03-31 2023-05-02 安徽博达项目管理咨询有限公司 Optical cable fireproof channel system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116047694A (en) * 2023-03-31 2023-05-02 安徽博达项目管理咨询有限公司 Optical cable fireproof channel system

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