Fireproof method for fireproofing fire resisting type prestressed tendon

Abstract

The present application relates to a kind of fireproof prestressed tendon's fireproof method, first step, when fire occurs, fire sensor detects fire signal, and water injection device is injected to the heat-insulating fire-resistant cavity between inner sleeve and outer sleeve by the water injection port on intermediate connector and / or end connector;Second step, water in heat-insulating fire-resistant cavity absorbs heat and boils, and steam generated by boiling is discharged by the corresponding steam exhaust port on intermediate connector and / or end connector;Third step, after steam in heat-insulating fire-resistant cavity is discharged by steam exhaust port, vacuum area is formed in heat-insulating fire-resistant cavity to realize heat insulation;Fourth step, heat is transferred to fireproof material sleeve by inner sleeve, and fireproof material sleeve plays the role of heat insulation;Fifth step, heat is transmitted to the fireproof paint layer of the outer periphery of center tendon by fireproof material sleeve, and fireproof paint layer plays the role of heat insulation.The present application provides a kind of fireproof prestressed tendon's fireproof method capable of realizing multi-level fireproofing when fire occurs.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of building construction fire prevention technology, and particularly relates to a fireproof method for fireproofing of a fireproof prestressed tendon. BACKGROUND

[0002] The carbon fiber reinforced polymer (CFRP) tendon is a new type of composite material formed by combining carbon fiber as a reinforcing material, synthetic resin as a matrix material, and a proper amount of auxiliary agents in a certain proportion, and through composite processes such as drawing, pressing, extrusion, and special surface treatment. Its main forms include round tendon, deformed tendon (notch, rib type, single spiral type, double spiral type, etc.), and twisted wire, etc. In the prestressed CFRP tendon used in civil engineering, the glass transition temperature of the resin matrix is relatively low, and the resin burns when exposed to fire, causing rapid deterioration of its mechanical properties. With the application of prestressed CFRP tendons in public building projects such as gymnasiums, theaters, and shopping malls, it is required to have fireproof function to ensure the safety of the structure. SUMMARY

[0003] The purpose of the present application is to provide a fireproof method for fireproofing of a fireproof prestressed tendon that can achieve multi-level fireproofing when a fire occurs.

[0004] To solve the above technical problems, the technical scheme of a fireproof method for fireproofing of a fireproof prestressed tendon in the present application is as follows:

[0005] A fireproof method for fireproofing of a fireproof prestressed tendon, the fireproof method comprising the following steps: first, when a fire occurs, a fire sensor detects a fire signal, and a water injection device injects water into a heat-insulating fire-resistant cavity between an inner sleeve and an outer sleeve through a water injection port on an intermediate connector and / or an end connector;

[0006] Second, the water in the heat-insulating fire-resistant cavity absorbs heat and boils, and the steam generated by boiling is discharged through a corresponding steam discharge port on the intermediate connector and / or the end connector;

[0007] Third, after the steam in the heat-insulating fire-resistant cavity is discharged through the steam discharge port, a vacuum area is formed in the heat-insulating fire-resistant cavity, thereby achieving heat insulation;

[0008] Fourth, heat is transferred to the fireproof material sleeve through the inner sleeve, and the fireproof material sleeve plays a heat-insulating role;

[0009] Fifth, heat is transmitted to the fireproof paint layer on the periphery of the center tendon through the fireproof material sleeve, and the fireproof paint layer plays a heat-insulating role.

[0010] Further, the fireproof prestressed tendon comprises a central tendon, an outer periphery of the central tendon is coated with a fireproof coating layer, the outer periphery of the fireproof coating layer is sleeved with a fireproof material sleeve, the outer periphery of the fireproof material sleeve is sleeved with an inner sleeve, the fireproof prestressed tendon further comprises an outer sleeve coaxially sleeved on the outer periphery of the inner sleeve, and a heat-insulating fireproof cavity is formed between the inner sleeve and the outer sleeve and arranged on the outer periphery of the fireproof material sleeve.

[0011] Further, the inner sleeve and the outer sleeve are both multi-segment structures arranged along the axial direction of the central tendon in sequence, two adjacent segments of the inner sleeve are referred to as a first inner sleeve and a second inner sleeve, two adjacent segments of the outer sleeve are referred to as a first outer sleeve and a second outer sleeve, the fireproof prestressed tendon further comprises an intermediate connector for connecting the two adjacent segments of the inner sleeve and the two adjacent segments of the outer sleeve, the intermediate connector has a connector central hole for the fireproof material sleeve to pass through, an upper end of a hole wall of the connector central hole is threadedly connected with the outer periphery of the first inner sleeve, and a lower end of the hole wall of the connector central hole is threadedly connected with the outer periphery of the second inner sleeve; an upper end of the outer periphery of the intermediate connector is threadedly connected with the inner periphery of the first outer sleeve, and a lower end of the outer periphery of the intermediate connector is threadedly connected with the inner periphery of the upper end of the second outer sleeve.

[0012] Further, the intermediate connector is provided with an intermediate connector water inlet and an intermediate connector steam outlet, and the intermediate connector steam outlet is provided with an intermediate connector steam valve.

[0013] Further, the heat-insulating fireproof cavity comprises an upper heat-insulating fireproof cavity surrounded by the first outer sleeve and the first inner sleeve and a lower heat-insulating fireproof cavity surrounded by the second outer sleeve and the second inner sleeve, and a plurality of connector through holes are arranged on the intermediate connector in a circumferential direction, the connector through holes penetrate the intermediate connector in an up-down direction to realize the communication between the upper heat-insulating fireproof cavity and the lower heat-insulating fireproof cavity.

[0014] Further, the fireproof prestressed tendon further comprises an end connector, the end connector comprises a connector end portion, an end connector inner pipe fixed to a connector end plate and an end connector outer pipe, an inner periphery of the end connector inner pipe is threadedly connected with an end portion of the inner sleeve, and an outer periphery of the end connector outer pipe is threadedly connected with an end portion of the outer sleeve.

[0015] Further, the end connector is provided with an end connector water inlet and an end connector steam outlet, and the end connector steam outlet is provided with an end connector steam valve.

[0016] Further, the water injection device comprises a water tank and a water pump, the water pump is connected with the corresponding connector water inlet through a water pipe, and the fire sensor is at least one of a smoke sensor, a temperature sensor or a visual fire detection sensor.

[0017] The application has the advantages that: in the application, the inner sleeve and the outer sleeve form a heat-insulating fireproof cavity, when no fire occurs, the heat-insulating fireproof cavity is in the state of containing air, so the weight of water does not act on the centering rib to affect the normal use of the centering rib, and there is no corresponding waterproof problem; when fire occurs, the water filling device fills water into the heat-insulating fireproof cavity, heat is first absorbed by the water, and the water plays a first layer of heat-insulating fireproof role; after the water becomes steam and is discharged through the corresponding steam outlet, the steam takes away the air in the heat-insulating fireproof cavity, so that the heat-insulating fireproof cavity is in a vacuum state to realize secondary heat insulation; with the continuation of the fire, the fireproof material sleeve, the inner sleeve and the outer sleeve are independent of the centering rib, and can be prefabricated in the factory and assembled on site, the fireproof reliability can be guaranteed, and since the manufacturing and replacement are relatively easy, when damage occurs, as long as the centering rib itself is not affected, other parts can be replaced.

[0018] Further, the fireproof material sleeve, the inner sleeve and the outer sleeve are independent of the centering rib, can be prefabricated in the factory and assembled on site, the fireproof reliability can be guaranteed, and since the manufacturing and replacement are relatively easy, when damage occurs, as long as the centering rib itself is not affected, other parts can be replaced.

[0019] Further, by changing the inner diameter of the outer sleeve, the inner diameter of the fireproof heat-insulating cavity can be changed, and the requirements of various fireproof grades can be met. BRIEF DESCRIPTION OF DRAWINGS

[0020] The above and other objects, features and advantages of the exemplary embodiments of the present disclosure will be more apparent from the following detailed description read in conjunction with the accompanying drawings, in which several embodiments of the present disclosure are shown by way of example, and wherein like or corresponding elements show like or corresponding parts, in which:

[0021] Figure 1 is a structural schematic diagram of one embodiment of the fireproof prestressed tendon in the application;

[0022] Figure 2 is a top view of Figure 1 ;

[0023] Figure 3 is a cooperation schematic diagram of the intermediate connector with the first inner sleeve, the first outer sleeve, the second inner sleeve and the second outer sleeve in the embodiment;

[0024] Figure 4 is a cooperation schematic diagram of the end connector with the inner sleeve and the outer sleeve in the embodiment;

[0025] Figure 5 is a structural schematic diagram of the end connector in Figure 4 ;

[0026] Figure 6 is a cooperation schematic diagram of the water tank of the water filling device in Figure 4 ;

[0027] Figure 7 is a structural schematic diagram of the intermediate connector in the embodiment;

[0028] Figure 8 is Figure 7 an A-A sectional view of the

[0029] Figure 9 is a distribution schematic diagram of the end connector when a plurality of central tendons are arranged to form a prestressed tendon bundle in the present application;

[0030] 1, central tendon; 2a, fireproof paint layer; 2b, fireproof material sleeve; 3, inner sleeve; 4, outer sleeve; 5, heat-insulating fire-resistant cavity; 6, intermediate connector; 7, connector through hole; 8, first inner sleeve; 9, first outer sleeve; 10, upper heat-insulating fire-resistant cavity; 11, second inner sleeve; 12, second outer sleeve; 13, lower heat-insulating fire-resistant cavity; 14, end connector; 15, connector end plate; 16, end connector inner tube; 17, end connector outer tube; 18, connector central hole; 19, water injection port; 20, end connector steam exhaust port; 21, end connector steam exhaust valve; 22, water pipe solenoid valve; 23, water pipe; 24, water tank; 25, water pump. DETAILED DESCRIPTION

[0031] In order to facilitate the understanding of the present application, the present application will be described in more detail below in conjunction with the drawings and specific embodiments. The preferred embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0032] It should be noted that unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing the specific embodiments and are not intended to limit the present application.

[0033] The fireproof method for the fireproof prestressed tendon in the present application is shown in the embodiment as Figures 1-9

[0034] The fireproof method includes the following steps, first, when the fire occurs, the fire sensor detects the fire signal, and the water injection device injects water into the heat-insulating fire-resistant cavity between the inner sleeve and the outer sleeve through the water injection port on the intermediate connector and / or the end connector;

[0035] Second, as the fire continues, the water in the heat-insulating fire-resistant cavity absorbs heat and boils, and the steam generated by boiling is discharged through the corresponding steam exhaust port on the intermediate connector and / or the end connector;

[0036] ​Thirdly, the steam in the heat-insulating fire-resistant cavity is discharged through the steam outlet, and a vacuum area is formed in the heat-insulating fire-resistant cavity to achieve heat insulation.

[0037] Fourthly, as the fire continues, heat is transferred to the fireproof material sleeve through the inner sleeve, and the fireproof material sleeve plays a role of heat insulation.

[0038] Fifthly, heat is transferred to the fireproof coating layer outside the center tendon through the fireproof material sleeve, and the fireproof coating layer plays a role of heat insulation.

[0039] In the embodiment, the fireproof prestressed tendon has a plurality of fireproof prestressed tendons, and the plurality of fireproof prestressed tendens form a prestressed tendon bundle.

[0040] The fireproof prestressed tendon comprises a center tendon 1, the center tendon 1 is a CFRP tendon, the outer periphery of the center tendon 1 is coated with a fireproof coating layer 2a, the outer periphery of the fireproof coating layer 2a is sleeved with a fireproof material sleeve 2b, the outer periphery of the fireproof material sleeve 2b is sleeved with an inner sleeve 3, and the fireproof prestressed tendon further comprises an outer sleeve 4 coaxially sleeved outside the inner sleeve, and a heat-insulating fire-resistant cavity 5 is formed between the inner sleeve 3 and the outer sleeve 4 and arranged outside the fireproof material sleeve.

[0041] In the embodiment, the fireproof material sleeve 2b is a prefabricated filling type fireproof material sleeve, and the inner sleeve 3 and the outer sleeve 4 are steel sleeves.

[0042] The inner sleeve 3 and the outer sleeve 4 are both multi-segment structures sequentially arranged along the axis of the center tendon, the two adjacent inner sleeves are referred to as a first inner sleeve 8 and a second inner sleeve 11, the two adjacent outer sleeves are referred to as a first outer sleeve 9 and a second outer sleeve 12, and the fireproof prestressed tendon further comprises an intermediate connector 6 for connecting the two adjacent inner sleeves and the two adjacent outer sleeves, the intermediate connector 6 connects the first outer sleeve 9, the first inner sleeve 8, the second outer sleeve 12 and the second inner sleeve 11, and simultaneously controls the spacing between the inner sleeve and the outer sleeve and maintains the coaxiality of the inner sleeve and the outer sleeve. The intermediate connector is made of light fireproof material, such as rock wool board, slag wool board, glass wool board and calcium silicate board.

[0043] The intermediate connector has a connector central hole 18 for the fireproof material sleeve to pass through, the upper end of the hole wall of the connector central hole 18 is threadedly connected with the outer periphery of the first inner sleeve, and the lower end of the hole wall of the connector central hole 18 is threadedly connected with the outer periphery of the second inner sleeve; the outer periphery of the intermediate connector 6 is threadedly connected with the inner periphery of the first outer sleeve 8 at the upper end, and the outer periphery of the intermediate connector 6 is threadedly connected with the inner periphery of the second outer sleeve 12 at the lower end. That is, the hole wall of the connector central hole 18 of the intermediate connector has a connecting thread, the outer periphery of the intermediate connector has a connecting thread, and the adjacent ends of the first inner sleeve and the second inner sleeve and the adjacent ends of the second inner sleeve and the second outer sleeve all have connecting threads.

[0044] The end thickness of the outer sleeve and the inner sleeve is 3mm, facilitating the setting of the connecting thread, and the thickness of the part between the connecting threads of the outer sleeve and the inner sleeve is 0.5mm.

[0045] The heat-insulated fire-resistant cavity comprises an upper heat-insulated fire-resistant cavity 10 surrounded by a first outer sleeve and a first inner sleeve and a lower heat-insulated fire-resistant cavity 13 surrounded by a second outer sleeve and a second inner sleeve, and a plurality of connector through holes 7 are arranged on the intermediate connector in a circumferential direction, and the connector through holes 7 penetrate the intermediate connector in an up-down direction to realize the communication of the upper heat-insulated fire-resistant cavity 10 and the lower heat-insulated fire-resistant cavity 13.

[0046] The fireproof prestressed tendon further comprises an end connector 14, the end connector 14 comprises a connector end plate 15 and an end connector inner tube 16 and an end connector outer tube 17 fixed to the connector end plate 15, the inner periphery of the end connector inner tube 16 is threadedly connected with the end of the inner sleeve, and the outer periphery of the end connector outer tube 17 is threadedly connected with the end of the outer sleeve. In the embodiment, the end of the central tendon is fixedly connected with the end connector 14, and in use, the central tendon can be tensioned by tensioning the end connector, and the end connector can directly apply the rebound force of the central tendon to other carriers. Of course, in other embodiments of the present application, the central tendon can also pass through the connector end plate of the end connector, and there is no force transmission relationship between the central tendon and the end connector. The end connector only plays a role in positioning the inner sleeve and the outer sleeve, and does not affect the tensioning process of the central tendon.

[0047] The end connector is provided with an end connector water inlet 19 and an end connector steam outlet 20, and the end connector steam outlet is provided with an end connector steam valve 21. The water injection device comprises a water tank 24 and a water pump 25, and the water pump 25 is connected with the corresponding end connector water inlet 19 through a water pipe 23. The fire sensor is at least one of a smoke sensor, a temperature sensor or a visual fire detection sensor. The smoke sensor can be an ion smoke detector, a photoelectric smoke detector, an infrared beam smoke detector and an air sampling smoke detector, etc. The visual fire detection sensor obtains fire information by shooting the flame. The above-mentioned sensors all belong to the prior art and will not be described in detail here. Item 22 in the figure represents a solenoid valve. In other embodiments of the present application, the intermediate connector can also be provided with an intermediate connector water inlet and an intermediate connector steam outlet, and the intermediate connector steam outlet is provided with an intermediate connector steam valve, and a water pipe is connected with the intermediate connector water inlet.

[0048] In the embodiment, the end connector water inlet and the end connector steam outlet are distributed in a 180° circumferential direction of the end connector, as shown in Figure 9As shown, the six end connectors constitute three groups of end connectors arranged in sequence in the left-right direction, each group of end connectors comprising two end connectors arranged in sequence in the front-rear direction, the water pipes connected to the end connectors being arranged in parallel and having an acute angle with the left-right direction and the front-rear direction, and the end connector steam valve on the front end connector being located between the water pipes of the two end connectors adjacent in the left-right direction, so that space is saved.

[0049] In the above description of the present specification, unless otherwise explicitly specified and limited, the terms "fixed", "mounted", "connected" or "linked" and the like should be understood in a broad sense. For example, as to the term "connected", it can be fixed connection, detachable connection, or integral; it can be mechanical connection, electrical connection; it can be direct connection, indirect connection through an intermediate medium, or internal communication of two elements or interaction relationship between two elements. Therefore, unless otherwise explicitly limited in the present specification, the above terms can be understood in the specific meaning in the present application by the person skilled in the art according to the specific circumstances.

[0050] According to the above description of the present specification, the person skilled in the art can also understand that the terms used, such as "upper", "lower", "front", "rear", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", "center", "longitudinal", "transverse", "clockwise" or "counterclockwise", and the like indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings of the present specification, which are only for the purpose of facilitating the description of the present application and simplifying the description, and are not explicitly or implicitly indicated that the devices or elements involved must have the specific orientation, be constructed and operated in the specific orientation, therefore the above orientation or positional relationship terms cannot be understood or interpreted as a limitation on the present application.

[0051] In addition, the terms "first" or "second" and the like used in the present specification are terms used to refer to numbers or ordinal numbers only for the purpose of description, and cannot be understood as explicitly or implicitly indicating relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first" or "second" can explicitly or implicitly include at least one of the features. In the description of the present specification, the meaning of "plurality" is at least two, such as two, three or more, etc., unless otherwise explicitly specified and limited.

[0052] It should be pointed out finally that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit the same; and although the present application has been described in detail with reference to the foregoing embodiments, it should be appreciated by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features thereof can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A fireproofing method for fireproofing a fireproofed prestressed tendon, characterized by: The fire-preventing method comprises the following steps: when a fire occurs, a fire sensor detects a fire signal, and a water injection device injects water into a heat-insulating fireproof cavity between an inner sleeve and an outer sleeve through a water injection port on an intermediate connector and / or an end connector; In the second step, the water in the heat-insulating fireproof cavity absorbs heat and boils, and the steam generated by the boiling is discharged through a corresponding steam discharge port on the intermediate connector and / or the end connector; In the third step, after the steam in the heat-insulating fireproof cavity is discharged through the steam discharge port, a vacuum area is formed in the heat-insulating fireproof cavity to achieve heat insulation; In the fourth step, heat is transferred to the fireproof material sleeve through the inner sleeve, and the fireproof material sleeve plays a heat-insulating role; In the fifth step, heat is transferred to the fireproof coating layer on the periphery of the center tendon through the fireproof material sleeve, and the fireproof coating layer plays a heat-insulating role.

2. The fire-impingement fireproofing method of claim 1, wherein: The fireproof prestressed tendon comprises a center tendon, a fireproof coating layer on the periphery of the center tendon, a fireproof material sleeve connected to the periphery of the fireproof coating layer, an inner sleeve connected to the periphery of the fireproof material sleeve, and an outer sleeve coaxially sleeved on the periphery of the inner sleeve, and a heat-insulating fireproof cavity is formed between the inner sleeve and the outer sleeve to surround the periphery of the fireproof material sleeve.

3. The fire-impingement fireproofing method of claim 2, wherein: The inner sleeve and the outer sleeve are both multi-segment structures sequentially arranged along the axis of the center tendon. Two adjacent segments of the inner sleeve are referred to as a first inner sleeve and a second inner sleeve, and two adjacent segments of the outer sleeve are referred to as a first outer sleeve and a second outer sleeve. The fireproof prestressed tendon further comprises a middle connector for connecting the two adjacent segments of the inner sleeve and the two adjacent segments of the outer sleeve. The middle connector has a connector center hole for the fireproof material sleeve to pass through. The upper end of the hole wall of the connector center hole is threadedly connected to the outer periphery of the first inner sleeve, and the lower end of the hole wall of the connector center hole is threadedly connected to the outer periphery of the second inner sleeve. The upper end of the outer periphery of the middle connector is threadedly connected to the inner periphery of the first outer sleeve, and the lower end of the outer periphery of the middle connector is threadedly connected to the inner periphery of the upper end of the second outer sleeve.

4. The fire-impingement fireproofing method of claim 3, wherein: The middle connector is provided with a middle connector water injection port and a middle connector steam discharge port, and the middle connector steam discharge port is provided with a middle connector steam discharge valve.

5. The fire-impingement fireproofing method according to claim 3, wherein: The heat-insulating fireproof cavity comprises an upper heat-insulating fireproof cavity surrounded by the first outer sleeve and the first inner sleeve, and a lower heat-insulating fireproof cavity surrounded by the second outer sleeve and the second inner sleeve. A plurality of connector through holes are circumferentially and spacedly arranged on the middle connector, and the connector through holes penetrate the middle connector in the up-down direction to realize the communication between the upper heat-insulating fireproof cavity and the lower heat-insulating fireproof cavity.

6. The fire-responsive fireproofing method of claim 2, wherein: The fireproof prestressed tendon further comprises an end connector. The end connector comprises a connector end and an end connector inner tube and an end connector outer tube fixed to the connector end plate. The inner periphery of the end connector inner tube is threadedly connected to the end of the inner sleeve, and the outer periphery of the end connector outer tube is threadedly connected to the end of the outer sleeve.

7. The fire-impingement fireproofing method according to claim 6, wherein: The end connector is provided with an end connector water injection port and an end connector steam discharge port, and the end connector steam discharge port is provided with an end connector steam discharge valve.

8. The fire-responsive fireproofing method according to any one of claims 3-7, wherein: The water injection device comprises a water tank and a water pump. The water pump is connected to the corresponding connector water injection port through a water pipe. The fire sensor is at least one of a smoke sensor, a temperature sensor, or a visual fire detection sensor.

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