CN112854665A - Fireproof assembly type construction system for super high-rise electrical shaft - Google Patents
Fireproof assembly type construction system for super high-rise electrical shaft Download PDFInfo
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- CN112854665A CN112854665A CN202110181521.1A CN202110181521A CN112854665A CN 112854665 A CN112854665 A CN 112854665A CN 202110181521 A CN202110181521 A CN 202110181521A CN 112854665 A CN112854665 A CN 112854665A
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- steel plate
- fireproof
- fireproof steel
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- 238000010276 construction Methods 0.000 title claims abstract description 38
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 94
- 239000010959 steel Substances 0.000 claims abstract description 94
- 239000000779 smoke Substances 0.000 claims abstract description 34
- 239000011449 brick Substances 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 238000004891 communication Methods 0.000 claims description 10
- 238000012544 monitoring process Methods 0.000 claims description 9
- 238000009434 installation Methods 0.000 claims description 8
- 238000010079 rubber tapping Methods 0.000 claims description 5
- 239000003063 flame retardant Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000013521 mastic Substances 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 4
- 230000002159 abnormal effect Effects 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 230000002265 prevention Effects 0.000 description 15
- 239000004570 mortar (masonry) Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 230000001934 delay Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000009970 fire resistant effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F17/00—Vertical ducts; Channels, e.g. for drainage
- E04F17/08—Vertical ducts; Channels, e.g. for drainage for receiving utility lines, e.g. cables, pipes
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C37/00—Control of fire-fighting equipment
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B1/94—Protection against other undesired influences or dangers against fire
- E04B1/941—Building elements specially adapted therefor
- E04B1/942—Building elements specially adapted therefor slab-shaped
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Building Environments (AREA)
Abstract
The invention discloses a fireproof fabricated construction system for a super high-rise electrical shaft, which comprises a masonry brick wall, a bridge frame, a shear wall and a fireproof steel plate. The invention has the beneficial effects that: the fireproof steel plate and the bracket are prefabricated in a factory, so that the work of on-site measurement and cutting is reduced, a large amount of labor is saved under the condition of insufficient labor, the construction time is shortened, and the construction progress is accelerated; the fireproof steel plate is made of a 1.5mm steel plate, the strength is high, the beam bottom is dragged by the steel plate through the assembly type bracket, and the fireproof plate cannot deform under the conditions that a vertical shaft is deep in opening and large in gap and more fireproof bags and fireproof daub need to be packaged, so that the fireproof effect can be well realized, and flame is prevented from spreading to an adjacent floor through the opening; the smoke detector adsorbed on the fireproof steel plate can quickly and timely detect the content of various abnormal smoke and report the position at the first time, and conditions are created for relevant personnel to extinguish fire at the first time before open fire is generated on site or before the open fire is not spread.
Description
Technical Field
The invention relates to a fireproof fabricated construction system for an electrical vertical shaft, in particular to a fireproof fabricated construction system for an ultra-high-rise electrical vertical shaft, and belongs to the technical field of electrical construction.
Background
In the traditional shaft fireproof plugging construction, an inorganic fireproof partition plate is often adopted as a fireproof plate, and according to the field bridge frame installation condition and the size of a shaft opening gap, field measurement, field cutting and field assembly are carried out. This type of installation requires a plurality of electric tools, increases the risk of electricity consumption, and takes more time, and delays the construction period in case of a short period.
In super high-rise building, the height of shaft entrance to a cave bottom structure roof beam can be bigger, and the entrance to a cave that needs the shutoff is very dark, needs a large amount of back-fire relief package of shutoff and fire prevention daub, and inorganic PLASTIC LAMINATED can not bear too big weight and by the pressure break. When the fire block is completed, although the fire does not spread to an adjacent floor, the fire may not be detected in the first time and the fire may be expanded.
Based on this, this application provides a super high-rise electrical shaft fire prevention assembled construction system.
Disclosure of Invention
The invention aims to solve the problems and provide a fireproof fabricated construction system for an ultra-high-rise electrical shaft.
The invention realizes the purpose through the following technical scheme: a fireproof fabricated construction system for a super high-rise electrical shaft comprises a masonry brick wall, a bridge frame, a shear wall and a fireproof steel plate; the masonry brick wall and the shear wall are connected together, and a horizontal bridge frame wall penetrating opening is reserved during masonry brick wall construction; the bridge is vertically arranged at a vertical shaft opening; the fire prevention steel sheet includes leading fire prevention steel sheet and rearmounted fire prevention steel sheet, leading fire prevention steel sheet, rearmounted fire prevention steel sheet and assembled bracket are according to size, crane span structure width and crane span structure height information of vertical well entrance to a cave before the construction, prefabricate in advance at the mill, leading fire prevention steel sheet fixed connection is at the medial surface of shear force wall, rearmounted fire prevention steel sheet sets up the outside at the crane span structure, the outside surface of rearmounted fire prevention steel sheet is provided with the manger plate platform, leading fire prevention steel sheet and rearmounted fire prevention steel sheet drag through the assembled bracket, just fire relief package and fire prevention daub are filled in the top space of leading fire prevention steel sheet and rearmounted fire prevention steel sheet.
As a still further scheme of the invention: the water retaining platform is built on the floor slab.
As a still further scheme of the invention: the assembly type bracket is L-shaped and is made of 50-5 fireproof galvanized angle steel, one side of the assembly type bracket is fixed on the side wall of the shear wall through expansion bolts, and the other side of the assembly type bracket is fixed at the bottom of the structural beam through expansion bolts.
As a still further scheme of the invention: the upper surface of the fireproof daub is flush with the water retaining platform, and the upper surface of the fireproof daub is additionally provided with a front fireproof steel plate and a rear fireproof steel plate through self-tapping.
As a still further scheme of the invention: the length of the fireproof steel plate is equal to the width of a vertical shaft opening, and the width of the bridge frame, the width of the rear fireproof steel plate, the gap of the bridge frame and the height of the bridge frame can be adjusted according to information such as the number and the size of the installed bridge frames.
As a still further scheme of the invention: the front fireproof steel plate and the rear fireproof steel plate are fixedly provided with information labels, and the information labels are marked with information such as the number, the size and the installation position of the fireproof steel plates.
As a still further scheme of the invention: and the smoke detector is fixedly adsorbed on the front fireproof steel plate through the magnet base.
As a still further scheme of the invention: a smoke detector outer cover is arranged on the outer side of the smoke detector, and an air inlet grid is arranged on the smoke detector outer cover.
As a still further scheme of the invention: install electric quantity monitoring module, group battery, smog analysis and alarm module, communication module, signal antenna on smoke detector's the magnet base, and electric quantity monitoring module is connected with the group battery through the connecting wire, and smog analysis and alarm module's one end is passed through the connecting wire and is connected with the group battery, and smog analysis and alarm module's the other end is connected with communication module through the connecting wire, and is provided with signal antenna on the communication module.
The invention has the beneficial effects that: the fireproof fabricated construction system for the super high-rise electrical shaft is reasonable in design, the fireproof steel plates and the brackets are prefabricated in factories, the work of on-site measurement and cutting is reduced, a large amount of labor is saved under the condition of shortage of labor, the construction time is shortened, and the construction progress is accelerated; the fireproof steel plate is made of a 1.5mm steel plate, the strength is high, the beam bottom is dragged by the steel plate through the assembly type bracket, and the fireproof plate cannot deform under the conditions that a vertical shaft is deep in opening and large in gap and more fireproof bags and fireproof daub need to be packaged, so that the fireproof effect can be well realized, and flame is prevented from spreading to an adjacent floor through the opening; material waste and pollution are avoided in the construction process, and the requirements of energy-saving and green construction are met; the bottom of the smoke detector is provided with the magnet, the smoke detector can be quickly and timely installed on the fireproof steel plate after the fireproof steel plate is installed, the requirement of quick installation of assembly type construction is met, the smoke detector adsorbed on the fireproof steel plate can quickly and timely detect various abnormal smoke contents and report the position at the first time, and conditions are created for related personnel to put out a fire at the first time before open fire is generated on site or before the open fire is not spread.
Drawings
FIG. 1 is a three-dimensional perspective view of the present invention;
FIG. 2 is a top view of the present invention;
FIG. 3 is a diagram of a prefabricated fire-resistant steel panel according to the present invention;
FIG. 4 is a comparison before and after plugging of a shaft opening according to the present invention;
FIG. 5 is a drawing of the bridge through masonry brick wall fireproof plugging and prefabricated fireproof steel plate of the invention;
FIG. 6 is a front view of the smoke detector of the present invention;
figure 7 is a cross-sectional view of a smoke detector of the present invention.
In the figure: 1. masonry brick wall, 2, bridge frame, 3, shear wall, 4-1, front fireproof steel plate, 4-2, rear fireproof steel plate, 5, water retaining platform, 6, floor slab, 7, structural beam, 8, assembly type bracket, 9, expansion bolt, 10, self-tapping, 11, information tag, 12, fire retardant package, 13, fireproof daub, 14, shaft opening, 15, smoke detector, 16, smoke detector housing, 17, air inlet grille, 18, magnet base, 19, electric quantity monitoring module, 20, battery pack, 21, smoke analysis and alarm module, 22, communication module, 23, signal antenna, 24, connecting wire, a, bridge frame width, b, rear fireproof steel plate width, c, bridge frame gap, h, bridge frame height and L, fireproof steel plate length.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 7, a fireproof fabricated construction system for a super high-rise electrical shaft comprises a masonry brick wall 1, a bridge frame 2, a shear wall 3 and a fireproof steel plate; the masonry brick wall 1 and the shear wall 3 are connected together, and a horizontal bridge frame wall penetrating opening is reserved during construction of the masonry brick wall 1; the bridge frame 2 is vertically arranged at a vertical shaft opening 14; the fireproof steel plate comprises a front fireproof steel plate 4-1 and a rear fireproof steel plate 4-2, the front fireproof steel plate 4-1, the rear fireproof steel plate 4-2 and the assembly type bracket 8 are arranged in the bridge frame, before construction, according to the information of the size of the vertical well opening 14, the width a of the bridge frame and the height h of the bridge frame, the front fireproof steel plate 4-1 is prefabricated in advance in a factory and is fixedly connected with the inner side surface of the shear wall 3, the rear fireproof steel plate 4-2 is arranged on the outer side of the bridge frame 2, the outer side surface of the rear fireproof steel plate 4-2 is provided with a water baffle table 5, the front fireproof steel plate 4-1 and the rear fireproof steel plate 4-2 are dragged by an assembly type bracket 8, and the gaps above the front fireproof steel plate 4-1 and the rear fireproof steel plate 4-2 are filled with fire retardant bags 12 and fireproof mortar 13.
In the embodiment of the invention, the water retaining platform 5 is built on the floor slab 6 and used for preventing liquid such as water from flowing into the vertical shaft hole 14.
In the embodiment of the invention, the fabricated bracket 8 is in an L shape and is made of 50-5 fireproof galvanized angle steel, one side of the fabricated bracket is fixed on the side wall of the shear wall 3 through an expansion bolt 9, and the other side of the fabricated bracket is fixed at the bottom of the structural beam 7 through the expansion bolt 9.
In the embodiment of the invention, the upper surface of the fireproof daub 13 is flush with the water retaining table 5, and the front fireproof steel plate 4-1 and the rear fireproof steel plate 4-2 are additionally arranged above the fireproof daub 13 through the self-tapping 10, so that the fireproof daub 13 is ensured not to be damaged.
In the embodiment of the invention, the length L of the fireproof steel plate is equal to the width of the shaft opening 14, and the width a of the bridge, the width b of the rear fireproof steel plate, the gap c of the bridge and the height h of the bridge can be adjusted according to the information such as the number and the size of the installed bridges 2.
In the embodiment of the invention, the information labels 11 are fixedly arranged on the front fireproof steel plate 4-1 and the rear fireproof steel plate 4-2, and the information labels 11 are marked with information such as the number, the size, the installation position and the like of the fireproof steel plates, so that the front fireproof steel plate 4-1 and the rear fireproof steel plate 4-2 can be placed at specified positions in advance according to the information, and the installation condition can be met, the assembly can be carried out quickly, the field measurement is not needed, and the cutting and the blanking are not needed.
In the embodiment of the invention, the smoke detector 15 is fixedly adsorbed on the front fireproof steel plate 4-1 through the magnet base 18, so that the quick installation can be realized.
In the embodiment of the present invention, a smoke detector housing 16 is provided outside the smoke detector 15, and an air inlet grille 17 is provided on the smoke detector housing 16, so that smoke can more easily enter the inside of the smoke detector 15.
In the embodiment of the invention, an electric quantity monitoring module 19, a battery pack 20, a smoke analysis and alarm module 21, a communication module 22 and a signal antenna 23 are installed on a magnet base 18 of the smoke detector 15, the electric quantity monitoring module 19 is connected with the battery pack 20 through a connecting wire 24, one end of the smoke analysis and alarm module 21 is connected with the battery pack 20 through the connecting wire 24, the other end of the smoke analysis and alarm module 21 is connected with the communication module 22 through the connecting wire 24, the communication module 22 is provided with the signal antenna 23, smoke components and content in a located area can be rapidly and intelligently analyzed through the smoke analysis and alarm module 21, rapid alarm is realized, alarm information is fed back to a monitoring platform, and the electric quantity monitoring module 19 can monitor the electric quantity of the battery pack 20 in real time and realize low-electric-quantity alarm.
The working principle is as follows: when the fireproof fabricated construction system of the super high-rise electrical shaft is used, the fireproof steel plate and the fabricated bracket 8 which are produced and processed are placed at the positions to be installed in advance according to the information on the information tag 11, so that material disorder is avoided; when the bridge frame 2 and the cable in the electric shaft are constructed, construction can be carried out when fireproof plugging construction conditions are met. In the process, the assembled bracket 8 is fixed at the bottom of the structural beam 7 by using an expansion bolt 9, then the front fireproof steel plate 4-1 and the rear fireproof steel plate 4-2 are arranged at the upper part of the bracket 2, a fireproof bag 12 and fireproof mortar 13 are filled above the bracket, and the top of the fireproof mortar 13 is flush with the water retaining platform 5. The top of the fireproof daub 13 is provided with a front fireproof steel plate 4-1 and a rear fireproof steel plate 4-2, and is fixed by a self-tapping screw 10. And after the fireproof steel plate is installed, the smoke detector 15 is installed on the fireproof steel plate in an adsorption mode.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (9)
1. A fireproof fabricated construction system of a super high-rise electrical shaft comprises a masonry brick wall (1), a bridge frame (2), a shear wall (3) and a fireproof steel plate; the method is characterized in that: the masonry brick wall (1) is connected with the shear wall (3), and a horizontal bridge frame wall penetrating opening is reserved during construction of the masonry brick wall (1); the bridge (2) is vertically arranged at a vertical shaft opening (14); the fireproof steel plate comprises a front fireproof steel plate (4-1) and a rear fireproof steel plate (4-2), the front fireproof steel plate (4-1), the rear fireproof steel plate (4-2) and an assembly type bracket (8) are prefabricated in a factory in advance according to the size of a vertical well opening (14), the width (a) of a bridge frame and the height (h) of the bridge frame before construction, the front fireproof steel plate (4-1) is fixedly connected to the inner side face of a shear wall (3), the rear fireproof steel plate (4-2) is arranged on the outer side of the bridge frame (2), a water retaining platform (5) is arranged on the outer side surface of the rear fireproof steel plate (4-2), the front fireproof steel plate (4-1) and the rear fireproof steel plate (4-2) are dragged through the assembly type bracket (8), and a fire retardant bag is filled in gaps above the front fireproof steel plate (4-1) and the rear fireproof steel plate (4-2) (12) And a fire-retardant mastic (13).
2. The super high-rise electrical shaft fire protection fabricated construction system of claim 1, wherein: the water retaining platform (5) is built on the floor slab (6).
3. The super high-rise electrical shaft fire protection fabricated construction system of claim 1, wherein: the assembly type bracket (8) is L-shaped and is made of 50-5 fireproof galvanized angle steel, one side of the assembly type bracket is fixed on the side wall of the shear wall (3) through an expansion bolt (9), and the other side of the assembly type bracket is fixed at the bottom of the structural beam (7) through the expansion bolt (9).
4. The super high-rise electrical shaft fire protection fabricated construction system of claim 1, wherein: the upper surface of the fireproof daub (13) is flush with the water retaining platform (5), and the front fireproof steel plate (4-1) and the rear fireproof steel plate (4-2) are additionally arranged above the fireproof daub (13) through self-tapping (10).
5. The super high-rise electrical shaft fire protection fabricated construction system of claim 1, wherein: the length (L) of the fireproof steel plate is equal to the width of a vertical shaft opening (14), and the width (a) of the bridge, the width (b) of the rear fireproof steel plate, the gap (c) of the bridge and the height (h) of the bridge can be adjusted according to the number, the size and other information of the installed bridges (2).
6. The super high-rise electrical shaft fire protection fabricated construction system of claim 1, wherein: the front fireproof steel plate (4-1) and the rear fireproof steel plate (4-2) are fixedly provided with information labels (11), and the information labels (11) are marked with information such as numbers, sizes and installation positions of the fireproof steel plates.
7. The super high-rise electrical shaft fire protection fabricated construction system of claim 1, wherein: and a smoke detector (15) is fixedly adsorbed on the front fireproof steel plate (4-1) through a magnet base (18).
8. The super high-rise electrical shaft fire protection fabricated construction system of claim 7, wherein: a smoke detector outer cover (16) is arranged on the outer side of the smoke detector (15), and an air inlet grid (17) is arranged on the smoke detector outer cover (16).
9. The super high-rise electrical shaft fire protection fabricated construction system of claim 7, wherein: install electric quantity monitoring module (19) on magnet base (18) of smoke detector (15), group battery (20), smog analysis and alarm module (21), communication module (22), signal antenna (23), and electric quantity monitoring module (19) are connected with group battery (20) through connecting wire (24), the one end of smog analysis and alarm module (21) is passed through connecting wire (24) and is connected with group battery (20), the other end of smog analysis and alarm module (21) is connected with communication module (22) through connecting wire (24), and be provided with signal antenna (23) on communication module (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110181521.1A CN112854665A (en) | 2021-02-09 | 2021-02-09 | Fireproof assembly type construction system for super high-rise electrical shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110181521.1A CN112854665A (en) | 2021-02-09 | 2021-02-09 | Fireproof assembly type construction system for super high-rise electrical shaft |
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| Publication Number | Publication Date |
|---|---|
| CN112854665A true CN112854665A (en) | 2021-05-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110181521.1A Pending CN112854665A (en) | 2021-02-09 | 2021-02-09 | Fireproof assembly type construction system for super high-rise electrical shaft |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203230961U (en) * | 2013-04-21 | 2013-10-09 | 青岛一建集团有限公司 | Fireproof blocking structure at cable bridge floor-crossing plate |
| CN103556747A (en) * | 2013-10-18 | 2014-02-05 | 陕西沃尔思消防技术有限公司 | Fireproof blocking construction technology for cable shaft |
| CN203514556U (en) * | 2013-09-23 | 2014-04-02 | 中建二局第一建筑工程有限公司 | Fireproof blocking structure for vertical shaft hole |
| CN208884738U (en) * | 2018-09-05 | 2019-05-21 | 湖北楚禾新材料有限公司 | A kind of power engineering pipeline wears vertical shaft fire-resistant plugging device |
| DE102018211733A1 (en) * | 2018-07-13 | 2020-01-16 | Thyssenkrupp Ag | Fire protection device for an elevator system |
| CN210127554U (en) * | 2019-04-11 | 2020-03-06 | 大连三川建设集团股份有限公司 | Fire-proof plugging construction structure for large-hole electric well bridge |
| CN214462171U (en) * | 2021-02-09 | 2021-10-22 | 中铁建设集团有限公司 | Fireproof assembly type construction system for super high-rise electrical shaft |
-
2021
- 2021-02-09 CN CN202110181521.1A patent/CN112854665A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203230961U (en) * | 2013-04-21 | 2013-10-09 | 青岛一建集团有限公司 | Fireproof blocking structure at cable bridge floor-crossing plate |
| CN203514556U (en) * | 2013-09-23 | 2014-04-02 | 中建二局第一建筑工程有限公司 | Fireproof blocking structure for vertical shaft hole |
| CN103556747A (en) * | 2013-10-18 | 2014-02-05 | 陕西沃尔思消防技术有限公司 | Fireproof blocking construction technology for cable shaft |
| DE102018211733A1 (en) * | 2018-07-13 | 2020-01-16 | Thyssenkrupp Ag | Fire protection device for an elevator system |
| CN208884738U (en) * | 2018-09-05 | 2019-05-21 | 湖北楚禾新材料有限公司 | A kind of power engineering pipeline wears vertical shaft fire-resistant plugging device |
| CN210127554U (en) * | 2019-04-11 | 2020-03-06 | 大连三川建设集团股份有限公司 | Fire-proof plugging construction structure for large-hole electric well bridge |
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