CN114674972A - Method for detecting fireproof performance of cavity floor slab with built-in smoke exhaust and ventilation pipeline - Google Patents

Method for detecting fireproof performance of cavity floor slab with built-in smoke exhaust and ventilation pipeline Download PDF

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CN114674972A
CN114674972A CN202210176201.1A CN202210176201A CN114674972A CN 114674972 A CN114674972 A CN 114674972A CN 202210176201 A CN202210176201 A CN 202210176201A CN 114674972 A CN114674972 A CN 114674972A
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pipeline
test piece
cavity floor
flue gas
hearth
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王勇
刘伟鑫
王颂淯
古傲林
张亚军
王功臣
部翼翔
任兆卿
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China University of Mining and Technology CUMT
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China University of Mining and Technology CUMT
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
    • G01N31/12—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using combustion
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F5/00—Measuring a proportion of the volume flow
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L13/00—Devices or apparatus for measuring differences of two or more fluid pressure values

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  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Molecular Biology (AREA)
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  • General Health & Medical Sciences (AREA)
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  • Fluid Mechanics (AREA)
  • Fire-Detection Mechanisms (AREA)

Abstract

The invention discloses a method for detecting the fireproof performance of a cavity floor slab with a built-in smoke exhaust ventilation pipeline, which is characterized in that the fireproof performance of the cavity floor slab with the built-in smoke exhaust ventilation pipeline is respectively detected according to an internal fire condition and an external fire condition; the cavity floor fire behavior to built-in air pipe of discharging fume that can be fine detects, receives the condition of a fire and the outside condition of receiving a fire respectively to built-in air pipe of discharging fume's cavity floor fire behavior according to inside and detect, can make the testing result of fire behavior more comprehensive, more accurate.

Description

Method for detecting fireproof performance of cavity floor slab with built-in smoke exhaust and ventilation pipeline
Technical Field
The invention relates to the field of detection of the fireproof performance of a cavity floor slab, in particular to a method for detecting the fireproof performance of the cavity floor slab with a built-in smoke exhaust ventilation pipeline.
Background
With the increasing requirements of people on the indoor space size and comfort level, the hollow floor slab developed by excavating the concrete which has little influence on the stress and deformation in the solid floor slab becomes a novel floor slab type which is more popularized and applied in the engineering world of China in recent years. Meanwhile, smoke exhaust pipelines and fire fighting pipelines of underground garages, large shopping malls and other structures are large in size, occupy large space and seriously affect the clearance height of the structures. For the cavity floor, if the smoke exhaust pipeline is arranged at the bottom of the plate, the engineering value of the cavity cannot be exerted, and the popularization and the application of the cavity floor are seriously restricted, so that the cavity floor with the built-in smoke exhaust ventilating duct becomes a new design trend.
At present, a method for detecting the fire resistance of the novel floor slab does not exist in the technical field of building construction fire resistance detection.
Disclosure of Invention
Aiming at the technical defects, the invention aims to provide a method for detecting the fireproof performance of a cavity floor slab of a built-in smoke exhaust ventilation pipeline, which can well detect the fireproof performance of the cavity floor slab of the built-in smoke exhaust ventilation pipeline.
In order to solve the technical problem, the invention adopts the following technical scheme:
the invention provides a method for detecting the fireproof performance of a cavity floor slab with a built-in smoke exhaust ventilation pipeline, which is characterized in that the fireproof performance of the cavity floor slab with the built-in smoke exhaust ventilation pipeline is respectively detected according to an internal fire condition and an external fire condition;
when the detection is carried out according to the internal fire condition, the method specifically comprises the following steps:
(A1) processing a pipeline section opening communicated with a cavity floor test piece at one end of the cavity floor test piece, extending one end of the cavity floor test piece with the pipeline section opening into a hearth, extending the other end of the cavity floor test piece out of the hearth, and sequentially connecting a connecting pipeline, a condenser, a rectifier, an equipment pipeline and a fan, wherein a gas flowmeter for detecting the gas flow in the equipment pipeline is installed on the equipment pipeline, an infrared temperature detection sensor for detecting the temperature of the pipeline section opening is installed on a furnace wall corresponding to the hearth, the hearth is communicated with a flue gas discharge pipeline, and a flue gas flow sensor is arranged in the flue gas discharge pipeline;
(A2) Turning on a fan, adjusting the fan by using data detected by a gas flowmeter, and controlling the flow of gas in the equipment pipeline to be 3 +/-0.45 m/s;
(A3) heating the hearth by using an ignition device, starting to record the starting time of the test when the temperature of the flue gas measured by an infrared temperature detection sensor reaches 50 ℃, continuously heating the hearth to enable the average temperature of the measured temperature of the flue gas to reach 280 ℃ within 2min, and simultaneously adjusting a fan by using data detected by a gas flowmeter to control the flow of the gas in the equipment pipeline to be 3 +/-0.45 m/s;
(A4) after beginning 5min, keeping the average temperature of the flue gas at 280-310 ℃, keeping the gas flow in the equipment pipeline at 3 +/-0.45 m/s, recording the flue gas flow measured by a flue gas flow sensor when the test is carried out for 10min, setting the flue gas flow as an initial value, and monitoring the flue gas flow in real time by taking minutes as a unit;
(A5) recording deformation conditions of the test piece, environmental temperature, temperature in a furnace, surface temperature of the test piece, temperature of the tail end of a pipeline and flue gas flow parameters in real time by taking minutes as a unit;
(A6) closing and removing the fan 25min after the test is started, plugging the tail end of the pipeline by using a whole piece of heat insulation cotton, blocking the flow of smoke in the pipeline, keeping for 5min, continuously monitoring the integrity and heat insulation of the test piece during the period, removing the heat insulation cotton, reconnecting the fan, and recovering the air supply of the fan;
(A7) Repeating the step (A6) 5min before each test period is finished by taking 30min as a test period until the time required by a client is reached or the fire resistance limit of the test piece is reached;
when the detection is carried out according to the external fire condition, the method specifically comprises the following steps:
(B1) processing one end of a cavity floor test piece into a sealing end, extending the sealing end of the cavity floor test piece into a hearth, extending the other end of the cavity floor test piece out of the hearth, sequentially connecting a connecting pipeline, an equipment pipeline and a fan, mounting a barometer for detecting the gas pressure in the equipment pipeline on the equipment pipeline, mounting an infrared temperature detection sensor for detecting the temperature of an opening of the cross section of the pipeline on a furnace wall corresponding to the hearth, communicating the hearth with a flue gas discharge pipeline, and arranging a flue gas flow sensor in the flue gas discharge pipeline;
(B2) turning on a fan, and adjusting the fan by using data detected by a barometer to enable the pressure of gas in the equipment pipeline to be less than 300 +/-15 Pa;
(B3) heating a hearth by using an ignition device, starting to record the starting time of the test when the temperature of the flue gas measured by an infrared temperature detection sensor reaches 50 ℃, continuing to heat the hearth to enable the average temperature of the measured temperature of the flue gas to reach 280 ℃ within 2min, and simultaneously adjusting a fan by using data detected by a barometer to enable the gas pressure in a pipeline of the equipment to be less than 300 +/-15 Pa;
(B4) Recording the deformation condition of the test piece, the environmental temperature, the temperature in the furnace, the surface temperature of the test piece, the tail end temperature of the test piece and the smoke flow parameters in real time by taking minutes as a unit;
(B5) closing and removing the fan 25min after the test is started, plugging the tail end of the pipeline by using a whole piece of heat insulation cotton, blocking the flow of smoke in the pipeline, keeping for 5min, continuously monitoring the integrity and heat insulation of the test piece during the period, removing the heat insulation cotton, reconnecting the fan, and recovering the air supply of the fan;
(B6) and (5) repeating the step (B5) for 5min before the end of each test period by taking 30min as a test period until the time required by the client is reached or the fire resistance limit of the test piece is reached.
Preferably, the cross section of the cavity floor test piece is a rectangular cross section.
Preferably, the cross-sectional dimension of the cavity floor test piece is 1000mm × 500mm, and the total length is 6 m.
Preferably, the connecting pipeline and the equipment pipeline are circular pipelines.
Preferably, one end of the cavity floor slab test piece extending into the hearth is fixed with the inner wall of the hearth through a support frame in the furnace.
Preferably, a fireproof blocking structure corresponding to the cavity floor test piece is arranged on the furnace wall of the hearth.
The invention has the beneficial effects that: .
The method is simple to operate, can well detect the fireproof performance of the cavity floor slab with the built-in smoke exhaust ventilation pipeline, and can respectively detect the fireproof performance of the cavity floor slab with the built-in smoke exhaust ventilation pipeline according to the internal fire condition and the external fire condition, so that the detection result of the fireproof performance is more comprehensive and more accurate.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic layout of a cavity floor test piece in an internal fire state;
FIG. 2 is a schematic diagram showing the arrangement of test pieces of a cavity floor in an external fire state;
fig. 3 is a schematic cross-sectional structure diagram of a cavity floor test piece.
Description of reference numerals:
1-supporting frame in furnace; 2, opening the section of the pipeline; 3-sealing end of pipeline; 4, a hearth; 5-furnace wall; 6-air duct connecting piece; 7-a support structure; 8, fireproof blocking; 9-cavity floor slab test piece; 10-connecting a pipeline; 11-a condenser; 12-a rectifier; 13-equipment piping; 14-a gas flow meter; 15, a fan; 16-barometer.
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 obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
As shown in fig. 1 to fig. 2, this embodiment provides a method for detecting fire-proof performance of a cavity floor slab of a built-in smoke exhaust ventilation duct, which detects fire-proof performance of the cavity floor slab of the built-in smoke exhaust ventilation duct according to an internal fire condition and an external fire condition;
when the detection is carried out according to the internal fire condition, the method specifically comprises the following steps:
(A1) processing a pipeline section opening 2 communicated with a cavity floor test piece 9 at one end of the cavity floor test piece 9, extending one end of the cavity floor test piece 9 with the pipeline section opening 2 into a hearth 4, extending the other end of the cavity floor test piece 9 out of the hearth 4, and sequentially connecting a connecting pipeline 10, a condenser 11, a rectifier 12, an equipment pipeline 13 and a fan 15, wherein a gas flowmeter 14 used for detecting the gas flow in the equipment pipeline 13 is installed on the equipment pipeline 13, an infrared temperature detection sensor used for detecting the temperature at the pipeline section opening 2 is installed on a furnace wall 5 corresponding to the hearth 4, the hearth 4 is communicated with a flue gas discharge pipeline, and a flue gas flow sensor is arranged in the flue gas discharge pipeline;
(A2) Opening the fan 15, adjusting the fan 15 by using the data detected by the gas flowmeter 14, and controlling the gas flow in the equipment pipeline 13 to be 3 +/-0.45 m/s;
(A3) heating the hearth 4 by using an ignition device, starting to record the starting time of the test when the temperature of the flue gas measured by an infrared temperature detection sensor reaches 50 ℃, continuing to heat the hearth 4 to enable the average temperature of the measured temperature of the flue gas to reach 280 ℃ within 2min, and simultaneously adjusting a fan (15) by using data detected by a gas flowmeter 14 to control the gas flow in the equipment pipeline 13 to be 3 +/-0.45 m/s;
(A4) after beginning 5min, keeping the average temperature of the flue gas at 280-310 ℃, keeping the gas flow in the equipment pipeline at 3 +/-0.45 m/s, recording the flue gas flow measured by a flue gas flow sensor when the test is carried out for 10min, setting the flue gas flow as an initial flue gas flow value, and monitoring the flue gas flow in real time by taking minutes as a unit;
(A5) recording the deformation condition of the test piece, the environmental temperature, the temperature in the furnace, the surface temperature of the test piece, the tail end temperature of the test piece and the smoke flow parameters in real time by taking minutes as a unit; wherein the deformation of the test piece is directly observed and recorded by a tester, and the ambient temperature is obtained by measuring the external ambient temperature during the test by using a conventional alcohol thermometer which is well known to those skilled in the art. Arranging a conventional thermocouple which is well known to a person skilled in the art on the wall of the test furnace, wherein the arrangement position of the thermocouple is equal to the geometric center of the section of the test piece, and the thermocouple is used for measuring the temperature in the furnace; the thermocouple for measuring the temperature of the tail end of the test piece is 5, is arranged on the outlet section of the backfire end of the test piece and is respectively positioned at the center of the section of the test piece and 100mm away from the centers of four sides of the rectangular pipeline of the test piece; the number of the thermocouples for measuring the surface temperature of the test piece is 8, and the thermocouples are arranged in the middle positions of four surfaces of the rectangular pipeline at positions 25mm and 325mm away from the outer side of the supporting structure on the surface of the test piece; the flue gas flow is detected by a flue gas flow sensor.
(A6) After the test is started for 25min, closing and detaching the fan (15), plugging the tail end of the pipeline by using a whole piece of heat insulation cotton, blocking the flow of smoke in the pipeline, keeping for 5min, continuously monitoring the integrity and heat insulation of the test piece during the period, then removing the heat insulation cotton, reconnecting the fan, and recovering the air supply of the fan (15);
(A7) repeating the step (A6) 5min before each test period is finished by taking 30min as a test period until the time required by the consignor is reached or the test piece reaches the fire resistance limit;
when the detection is carried out according to the external fire condition, the method specifically comprises the following steps:
(B1) processing one end of a cavity floor test piece (9) into a sealing end, extending the sealing end of the cavity floor test piece (9) into a hearth (4), extending the other end of the cavity floor test piece (9) out of the hearth (4), sequentially connecting a connecting pipeline (10), an equipment pipeline (13) and a fan (15), installing a barometer (16) for detecting the gas pressure in the equipment pipeline (13) on the equipment pipeline (13), installing an infrared temperature detection sensor for detecting the temperature at a pipeline section opening (2) on a furnace wall (5) corresponding to the hearth (4), communicating the hearth (4) with a flue gas discharge pipeline, and arranging a flue gas flow sensor in the flue gas discharge pipeline;
(B2) Opening the fan (15), and adjusting the fan (15) by using data detected by the barometer (16) to enable the gas pressure in the equipment pipeline (13) to be less than 300 +/-15 Pa;
(B3) heating the hearth (4) by using an ignition device, starting to record test starting time when the temperature of the flue gas measured by an infrared temperature detection sensor reaches 50 ℃, continuing to heat the hearth (4), enabling the average temperature of the measured flue gas temperature to reach 280 ℃ within 2min, and adjusting a fan (15) by using data detected by a barometer (16) to enable the gas pressure in the equipment pipeline (13) to be less than 300 +/-15 Pa;
(B4) recording the deformation condition of the test piece, the environmental temperature, the temperature in the furnace, the surface temperature of the test piece, the tail end temperature of the test piece and the smoke flow parameters in real time by taking minutes as a unit; wherein the deformation of the test piece is directly observed and recorded by a tester, and the ambient temperature is obtained by measuring the external ambient temperature during the test by using a conventional alcohol thermometer which is well known to those skilled in the art. Arranging a conventional thermocouple which is well known to a person skilled in the art on the furnace wall of the test furnace, wherein the arrangement position is as high as the geometric center of the section of the test piece so as to measure the temperature in the furnace; the thermocouple for measuring the temperature of the tail end of the test piece is 5, is arranged on the outlet section of the backfire end of the test piece and is respectively positioned at the center of the section of the test piece and 100mm away from the centers of four sides of the rectangular pipeline of the test piece; the number of the thermocouples for measuring the surface temperature of the test piece is 8, and the thermocouples are arranged in the middle positions of four surfaces of the rectangular pipeline at positions 25mm and 325mm away from the outer side of the supporting structure on the surface of the test piece; the flue gas flow is detected by a flue gas flow sensor.
(B5) After 25min from the beginning of the test, closing and removing the fan (15), plugging the tail end of the pipeline by using a whole piece of heat insulation cotton, blocking the flow of smoke in the pipeline, keeping for 5min, continuously monitoring the integrity and heat insulation of the test piece during the period, then removing the heat insulation cotton, reconnecting the fan, and recovering the air supply of the fan (15);
(B6) the step (B5) is repeated 5min before each test cycle is finished by taking 30min as a test cycle until the time required by the client is reached or the test piece reaches the fire endurance.
The cross section of the cavity floor slab test piece 9 is a rectangular cross section. The cross section size of the cavity floor slab test piece 9 is 1000mm multiplied by 500mm, and the total length is 6 m. The connecting pipeline 10 and the equipment pipeline 13 are circular pipelines. One end of the cavity floor test piece 9 extending into the hearth 4 is fixed with the inner wall of the hearth 4 through the inner support frame 1 in the furnace, a fireproof plugging structure corresponding to the cavity floor test piece 9 is arranged on a furnace wall 5 of the hearth 4, the fireproof plugging structure comprises a supporting structure 7 fixed with the furnace wall 5 and a fireproof plugging 8 fixed with the supporting structure 7, and a rectangular cavity of the cavity floor test piece 9 is communicated through an air pipe connecting piece 6.
The support frame 1 in the furnace, the hearth 4, the furnace wall 5, the air pipe connecting piece 6, the supporting structure 7, the fireproof plug 8, the cavity floor test piece 9, the connecting pipeline 10, the condenser 11, the rectifier 12, the equipment pipeline 13, the gas flowmeter 14, the fan 15, the barometer 16, the infrared temperature detection sensor, the flue gas exhaust pipeline and the flue gas flow sensor of the embodiment are conventional products or structures well known to those skilled in the art, and are connected with each other in a conventional connection manner well known to those skilled in the art, and will not be described in detail herein.
The furnace ignition device, the infrared temperature detection sensor, the flue gas flow sensor, the gas flow meter 14, the fan 15 and the barometer 16 of the present example are in control connection with existing controllers well known to those skilled in the art in a manner well known to those skilled in the art, and will not be described in detail herein.
In this example, the national standard "method for testing fire resistance of building Member part 1" was used for adjusting the furnace temperature: general requirements GB/T9978.1-2008, article 5.1.
The test pieces of this example reached the fire endurance in one of the following cases:
1) the heat insulation is lost when the average temperature rise of the surface exceeds 140 ℃ or the temperature rise of any part of the surface exceeds 180 ℃.
2) When the back fire surface of the test piece generates flame and the continuous burning time exceeds 10s and more than 10s, the integrity is lost.
3) The dry absorbent cotton is close to the damaged part on the surface of the pipe body, and the absorbent cotton loses integrity when being ignited.
4) The crack can be measured when the crack appears between the pipe body or the pipe body and the supporting structure, and a crack probe with the diameter of 6mm can penetrate through the test piece from the opening or the crack and move for a distance of 150mm along the opening or the crack; or a 25mm diameter gap probe, can penetrate the specimen through the opening or crack, losing integrity.
5) Under internal firing conditions, the fire and backfire end coupons were significantly deformed, resulting in loss of integrity when the recorded smoke flow (V1) at the end of the coupon was below 1/2 of the initial value (V0).
6) Under external fire conditions, integrity is lost when a pressure differential of (300 ± 15) Pa cannot be maintained within the pipeline.
This embodiment easy operation, cavity floor fire behavior to built-in air pipe of discharging fume that can be fine detects, receives the condition of a fire and the outside condition of a fire according to inside and detects the cavity floor fire behavior of built-in air pipe of discharging fume respectively, can make the testing result of fire behavior more comprehensive, more accurate.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (6)

1. A detection method for the fire-proof performance of a cavity floor slab with a built-in smoke exhaust ventilation pipeline is characterized in that the fire-proof performance of the cavity floor slab with the built-in smoke exhaust ventilation pipeline is respectively detected according to an internal fire condition and an external fire condition;
When the detection is carried out according to the internal fire condition, the method specifically comprises the following steps:
(A1) processing a pipeline section opening (2) communicated with the cavity floor slab test piece (9) at one end of the cavity floor slab test piece (9), extending one end of the cavity floor slab test piece (9) with the pipeline section opening (2) into the hearth (4), the other end of the cavity floor slab test piece (9) extends out of the hearth (4) and is sequentially connected with a connecting pipeline (10), a condenser (11), a rectifier (12), an equipment pipeline (13) and a fan (15), a gas flowmeter (14) for detecting the flow rate of gas in the equipment pipeline (13) is arranged on the equipment pipeline (13), an infrared temperature detection sensor for detecting the temperature of the opening (2) of the section of the pipeline is arranged on the furnace wall (5) corresponding to the hearth (4), the hearth (4) is communicated with a flue gas discharge pipeline, and a flue gas flow sensor is arranged in the flue gas discharge pipeline;
(A2) opening a fan (15), adjusting the fan (15) by using data detected by a gas flowmeter (14), and controlling the gas flow in the equipment pipeline (13) to be 3 +/-0.45 m/s;
(A3) heating the hearth (4) by using an ignition device, starting to record the test starting time when the temperature of the flue gas measured by an infrared temperature detection sensor reaches 50 ℃, continuously heating the hearth (4) to enable the average temperature of the measured temperature of the flue gas to reach 280 ℃ within 2min, and simultaneously adjusting a fan (15) by using data detected by a gas flowmeter (14) to control the gas flow in the equipment pipeline (13) to be 3 +/-0.45 m/s;
(A4) After beginning 5min, keeping the average temperature of the flue gas at 280-310 ℃, keeping the gas flow in the equipment pipeline at 3 +/-0.45 m/s, recording the flue gas flow measured by a flue gas flow sensor when the test is carried out for 10min, setting the flue gas flow as an initial value, and monitoring the flue gas flow in real time by taking minutes as a unit;
(A5) recording the deformation condition of the test piece, the environmental temperature, the temperature in the furnace, the surface temperature of the test piece, the temperature at the tail end of the pipeline and the flow parameters of flue gas in real time by taking minutes as a unit;
(A6) closing and removing the fan 25min after the test is started, plugging the tail end of the pipeline by using a whole piece of heat insulation cotton, blocking the flow of smoke in the pipeline, keeping for 5min, continuously monitoring the integrity and heat insulation of the test piece during the period, removing the heat insulation cotton, reconnecting the fan, and recovering the air supply of the fan;
(A7) repeating the step (A6) 5min before each test period is finished by taking 30min as a test period until the time required by the consignor is reached or the test piece reaches the fire resistance limit;
when the detection is carried out according to the external fire condition, the method specifically comprises the following steps:
(B1) processing one end of a cavity floor test piece (9) into a sealing end, extending the sealing end of the cavity floor test piece (9) into a hearth (4), extending the other end of the cavity floor test piece (9) out of the hearth (4), sequentially connecting a connecting pipeline (10), an equipment pipeline (13) and a fan (15), installing a barometer (16) for detecting the gas pressure in the equipment pipeline (13) on the equipment pipeline (13), installing an infrared temperature detection sensor for detecting the temperature at a pipeline section opening (2) on a furnace wall (5) corresponding to the hearth (4), communicating the hearth (4) with a flue gas discharge pipeline, and arranging a flue gas flow sensor in the flue gas discharge pipeline;
(B2) Opening the fan (15), and adjusting the fan (15) by using data detected by the barometer (16) to enable the gas pressure in the equipment pipeline (13) to be less than 300 +/-15 Pa;
(B3) heating the hearth (4) by using an ignition device, starting to record test starting time when the temperature of the flue gas measured by an infrared temperature detection sensor reaches 50 ℃, continuing to heat the hearth (4), enabling the average temperature of the measured flue gas temperature to reach 280 ℃ within 2min, and adjusting a fan (15) by using data detected by a barometer (16) to enable the gas pressure in the equipment pipeline (13) to be less than 300 +/-15 Pa;
(B4) recording deformation conditions of the test piece, environmental temperature, temperature in the furnace, surface temperature of the test piece, terminal temperature of the test piece and flue gas flow parameters in real time by taking minutes as a unit;
(B5) closing and removing the fan 25min after the test starts, plugging the tail end of the pipeline by using a whole piece of heat insulation cotton, blocking the flow of smoke in the pipeline, keeping for 5min, continuously monitoring the integrity and heat insulation of the test piece during the period, then removing the heat insulation cotton, reconnecting the fan, and recovering the air supply of the fan;
(B6) and (5) repeating the step (B5) for 5min before the end of each test period by taking 30min as a test period until the time required by the client is reached or the fire resistance limit of the test piece is reached.
2. The method for detecting the fire-proof performance of the cavity floor slab with the built-in smoke exhaust and ventilation pipeline according to claim 1, characterized in that the section of the cavity floor slab test piece (9) is a rectangular section.
3. The method for detecting the fire prevention performance of the cavity floor slab with the built-in smoke exhaust and ventilation pipeline as claimed in claim 1 or 2, characterized in that the cross-sectional dimension of the cavity floor slab test piece (9) is 1000mm x 500mm, and the total length is 6 m.
4. The method for detecting the fire prevention performance of the cavity floor slab with the built-in smoke exhaust ventilation pipeline is characterized in that the connecting pipeline (10) and the equipment pipeline (13) are circular pipelines.
5. The method for detecting the fire prevention performance of the cavity floor slab with the built-in smoke exhaust ventilation pipeline according to claim 1, wherein one end of the cavity floor slab test piece (9) extending into the hearth (4) is fixed with the inner wall of the hearth (4) through the support frame (1) in the furnace.
6. The method for detecting the fire prevention performance of the cavity floor slab with the built-in smoke exhaust ventilation pipeline according to claim 1, wherein a fire prevention blocking structure corresponding to the cavity floor slab test piece (9) is arranged on the furnace wall of the hearth (4).
CN202210176201.1A 2022-02-25 2022-02-25 Method for detecting fireproof performance of cavity floor slab with built-in smoke exhaust and ventilation pipeline Pending CN114674972A (en)

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Publication number Priority date Publication date Assignee Title
CN201416225Y (en) * 2009-06-04 2010-03-03 王本淼 Cast-in-situ open web building roof with hidden protection exhaustsmoke conduit system
CN204269577U (en) * 2014-10-30 2015-04-15 中国矿业大学 Controlled in wireless armoured concrete slab Fire-resistance test system
CN105401678A (en) * 2015-12-15 2016-03-16 湖南科技大学 Cast-in-concrete hollow floor inner die system with indoor smoke discharging function
CN207553407U (en) * 2017-10-30 2018-06-29 邓丽君 It is a kind of that there is the cast-in-place concrete hollow building roof of indoor fire-fighting
CN113565249A (en) * 2021-07-30 2021-10-29 中国矿业大学 Smoke exhaust and ventilation device, multifunctional cavity floor and manufacturing method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201416225Y (en) * 2009-06-04 2010-03-03 王本淼 Cast-in-situ open web building roof with hidden protection exhaustsmoke conduit system
CN204269577U (en) * 2014-10-30 2015-04-15 中国矿业大学 Controlled in wireless armoured concrete slab Fire-resistance test system
CN105401678A (en) * 2015-12-15 2016-03-16 湖南科技大学 Cast-in-concrete hollow floor inner die system with indoor smoke discharging function
CN207553407U (en) * 2017-10-30 2018-06-29 邓丽君 It is a kind of that there is the cast-in-place concrete hollow building roof of indoor fire-fighting
CN113565249A (en) * 2021-07-30 2021-10-29 中国矿业大学 Smoke exhaust and ventilation device, multifunctional cavity floor and manufacturing method

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中国工程建设标准化协会标准: "《T/CECS 886-2021 建筑防烟排烟风管防火性能试验方法标准》", 30 June 2021 *
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