Fireproof prestressed tendon with multi-layer fireproof structure

Abstract

The utility model relates to a fireproof prestressed tendon with a multi-layer fireproof structure, which comprises a central tendon, the periphery of the central tendon is coated with a fireproof coating layer, the periphery of the fireproof coating layer is sleeved and connected with a fireproof material sleeve, and the periphery of the fireproof material sleeve is sleeved and connected with an inner sleeve. The fireproof prestressed tendon further comprises an outer sleeve coaxially arranged on the periphery of the inner sleeve in a sleeving mode, and a heat insulation fire-resistant cavity annularly arranged on the periphery of the fireproof material sleeve is formed between the inner sleeve and the outer sleeve. When a fire disaster occurs, the heat-insulating fire-resistant cavity between the inner sleeve and the outer sleeve forms a first-layer fireproof structure, the fireproof material sleeve on the periphery of the fireproof coating forms a second-layer fireproof structure along with the continuation of the fire disaster, and when the second-layer fireproof structure fails, the fireproof coating layer coated on the periphery of the center rib serves as a third-layer fireproof structure. Therefore, the safety of the center rib is ensured through the multi-layer fireproof structure.

Description

TECHNICAL FIELD

[0001] The utility model relates to building construction technical field especially relates to a fireproof prestressed tendon with multilayer fireproof structure. BACKGROUND

[0002] Carbon fiber reinforced polymer (CFRP) tendon is a new type of composite material formed by combining carbon fiber as reinforcing material, synthetic resin as matrix material and appropriate amount of auxiliary agent in a certain proportion, and through composite processes such as drawing, pressing, extruding 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 low, and the resin burns when exposed to fire, causing rapid deterioration of its mechanical properties. With the application of prestressed CFRP tendon in public building engineering such as gymnasium, theater and shopping mall, it is required to have fireproof function to ensure the safety of the structure. SUMMARY

[0003] The utility model discloses a fireproof prestressed tendon with multilayer fireproof structure.

[0004] To solve the above technical problems, the technical scheme of a fireproof prestressed tendon with multilayer fireproof structure in the utility model is as follows:

[0005] A fireproof prestressed tendon with multilayer fireproof structure, comprising a central tendon, the 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 protective 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 fire-resistant cavity is formed between the inner sleeve and the outer sleeve and arranged around the outer periphery of the fireproof material sleeve.

[0006] Further, the fireproof material sleeve is a prefabricated filled fireproof material sleeve.

[0007] Further, the inner sleeve and the outer sleeve are both steel sleeves.

[0008] Further, the central tendon is a CFRP tendon.

[0009] Further, the inner sleeve and the outer sleeve are both multi-section structures arranged sequentially along the axial direction of the center tendon, the two adjacent sections of the inner sleeve are referred to as a first inner sleeve and a second inner sleeve, the two adjacent sections 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 sections of the inner sleeve and the two adjacent sections of the outer sleeve, the intermediate connector has a connector central hole for the fireproof material sleeve to pass through, the upper end of the hole wall of the connector central hole 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 is threadedly connected with the outer periphery of the second inner sleeve; the upper end of the outer periphery of the intermediate connector is threadedly connected with the inner periphery of the first outer sleeve, and the 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.

[0010] 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 perforations are arranged on the intermediate connector in a circumferential direction, the connector perforations pass through the intermediate connector in the up-down direction to realize the communication between the upper heat-insulating fireproof cavity and the lower heat-insulating fireproof cavity.

[0011] Further, the fireproof prestressed tendon further comprises an end connector, the end connector comprises a connector end portion, an end connector inner tube fixed to the connector end plate and an end connector outer tube, the inner periphery of the end connector inner tube is threadedly connected with the end portion of the inner sleeve, and the outer periphery of the end connector outer tube is threadedly connected with the end portion of the outer sleeve.

[0012] The fireproof prestressed tendon has the following beneficial effects: when a fire occurs, the heat-insulating fireproof cavity between the inner sleeve and the outer sleeve forms a first layer of fireproof structure, with the continuous fire, the fireproof material sleeve in the periphery of the fire retardant coating forms a second layer of fireproof structure, and when the second layer of fireproof structure fails, the fire retardant coating layer coated on the periphery of the center tendon serves as a third layer of fireproof structure, so that the safety of the center tendon is ensured through the multiple layers of fireproof structure.

[0013] Further, the fireproof material sleeve, the inner sleeve and the outer sleeve are independent of the center tendon, can be prefabricated in a factory and assembled on site, and can be easily manufactured and replaced, so that the fireproof reliability can be ensured, and when damage occurs, as long as the center tendon itself is not affected, other parts can be replaced.

[0014] 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 fire resistance grades can be met. BRIEF DESCRIPTION OF DRAWINGS

[0015] The above and other objects, features and advantages of the presently disclosed example embodiments will become more apparent from the following detailed description read in conjunction with the accompanying drawings. In the drawings, several embodiments of the present disclosure are illustrated by way of example and not limitation in which like reference numerals represent similar, or corresponding parts throughout the several views, wherein:

[0016] Figure 1 is a structural schematic diagram of one embodiment of the fireproof prestressed tendon in the utility model;

[0017] Figure 2 is Figure 1 a top view;

[0018] Figure 3 is a cooperation schematic diagram of the intermediate connector with the first inner sleeve, the first outer sleeve and the second inner sleeve, and the second outer sleeve in the embodiment;

[0019] Figure 4 is a cooperation schematic diagram of the end connector with the inner sleeve and the outer sleeve in the embodiment;

[0020] Figure 5 is Figure 4 a structural schematic diagram of the end connector in the utility model;

[0021] Figure 6 is a structural schematic diagram of the intermediate connector in the embodiment;

[0022] Figure 7 is Figure 6 an A-A sectional view of

[0023] 1, center tendon; 2a, fireproof coating layer; 2b, fireproof material sleeve; 3, inner sleeve; 4, outer sleeve; 5, heat insulation fire-resistant cavity; 6, intermediate connector; 7, connector through hole; 8, first inner sleeve; 9, first outer sleeve; 10, upper heat insulation fire-resistant cavity; 11, second inner sleeve; 12, second outer sleeve; 13, lower heat insulation fire-resistant cavity; 14, end connector; 15, connector end plate; 16, end connector inner tube; 17, end connector outer tube; 18, connector center hole. DETAILED DESCRIPTION

[0024] In order to facilitate the understanding of the utility model, the utility model will be described in more detail below in conjunction with the drawings and specific embodiments. The preferred embodiments of the utility model are given in the drawings. However, the utility model can be realized in many different forms, and is not limited to the embodiments described in the specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the utility model more thorough and comprehensive.

[0025] It should be noted that, unless otherwise defined, all technical and scientific terms used in the present application 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 present application are only for the purpose of describing specific embodiments and are not intended to limit the present application.

[0026] An embodiment of the fireproof prestressed tendon with a multi-layer fireproof structure in the present application is shown in the following Figures 1-7

[0027] 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, the fireproof prestressed tendon further comprises an outer sleeve 4 coaxially sleeved on the outer periphery of the inner sleeve, and a heat-insulating fireproof cavity 5 is formed between the inner sleeve 3 and the outer sleeve 4 and arranged around the outer periphery of the fireproof material sleeve.

[0028] In the present embodiment, the fireproof material sleeve 2b is a prefabricated filling type fireproof material sleeve; the inner sleeve 3 and the outer sleeve 4 are both steel sleeves.

[0029] The inner sleeve 3 and the outer sleeve 4 are both multi-segment structures sequentially arranged along the axial direction 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 serves to connect the first outer sleeve 9 and the first inner sleeve 8 and to connect the second outer sleeve 12 and the second inner sleeve 11, and the intermediate connector also serves to control the spacing between the inner sleeve and the outer sleeve and to maintain 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.

[0030] The intermediate connector has a connector central hole 18 in the center 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 upper end of the outer periphery of the intermediate connector 6 is threadedly connected with the inner periphery of the first outer sleeve 8, and the lower end of the outer periphery of the intermediate connector 6 is threadedly connected with the inner periphery of the upper end of the second outer sleeve 12. 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.

[0031] ​The end thickness of the outer sleeve pipe and the inner sleeve pipe is 3mm, facilitating the setting of the connecting thread, and the thickness of the part between the connecting threads of the outer sleeve pipe and the inner sleeve pipe is 0.5mm.

[0032] The heat-insulating fire-resistant cavity comprises an upper heat-insulating fire-resistant cavity 10 surrounded by a first outer sleeve pipe and a first inner sleeve pipe and a lower heat-insulating fire-resistant cavity 13 surrounded by a second outer sleeve pipe and a second inner sleeve pipe, 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 the up-down direction to realize the communication of the upper heat-insulating fire-resistant cavity 10 and the lower heat-insulating fire-resistant cavity 13.

[0033] 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 pipe 16 and an end connector outer pipe 17 fixed on the connector end plate 15, the inner periphery of the end connector inner pipe 16 is threadedly connected with the end of the inner sleeve pipe, and the outer periphery of the end connector outer pipe 17 is threadedly connected with the end of the outer sleeve pipe.

[0034] The preparation method of the fireproof prestressed tendon in the utility model is as follows:

[0035] Step 1, the diameters of the inner sleeve pipe and the outer sleeve pipe are determined according to the provisions of the Building Design Fireproof Specification GB50016;

[0036] Step 2, a fireproof coating layer is coated on the surface of the center tendon, and the coating thickness is not less than 5mm;

[0037] Step 3, a fireproof material sleeve is sleeved outside the fireproof coating, and the diameter of the fireproof material sleeve is determined according to the diameter of the inner sleeve pipe;

[0038] Step 4, the inner sleeve pipe is sleeved outside the fireproof material sleeve;

[0039] Step 5, when the inner sleeve pipes and the outer sleeve pipes are connected, an intermediate connector is used to connect the adjacent inner sleeve pipes and the adjacent outer sleeve pipes;

[0040] Step 6, an end connector is rotated and connected to the ends of the inner sleeve pipe and the outer sleeve pipe, and the fireproof prestressed tendon with the multi-layer fireproof protection is completed.

[0041] The utility model has the following technical effects:

[0042] 1. The filling type fireproof material sleeve of the fireproof type prestressed tendon is pre-fabricated by the factory to facilitate the standardized construction.

[0043] 2. The device is enhanced in integrity by the threaded connection, and the overall installation of the components is simpler.

[0044] 3. The mechanical connection greatly reduces the difficulty of field operation and speeds up the construction progress.

[0045] In the above description of the present specification, unless otherwise explicitly specified and limited, the terms "fixed", "installed", "connected" or "connected" and the like should be understood in a broad sense. For example, as to the term "connected", it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship between two elements. Therefore, unless otherwise explicitly limited in the present specification, those skilled in the art can understand the specific meaning of the above terms in the present application according to the specific circumstances.

[0046] According to the above description of the present specification, those skilled in the art can also understand the terms used as follows, for example, the terms indicating the orientation or positional relationship 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" are based on the orientation or positional relationship shown in the drawings of the present specification, which is only for the purpose of facilitating the description of the scheme of the present application and simplifying the description, and is not explicitly or implicitly indicated that the device or element involved must have the described specific orientation, and must be constructed and operated in a specific orientation, therefore the above orientation or positional relationship terms cannot be understood or interpreted as a limitation on the scheme of the present application.

[0047] 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 indicating relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" or "second" can explicitly or implicitly include at least one of the features. In the description of the present specification, the meaning of "a plurality of" is at least two, for example, two, three or more, etc., unless otherwise explicitly specified and limited.

[0048] It should be finally pointed out that: the above examples are only used to illustrate the technical solutions of the utility model, and not to limit them; although the utility model has been explained in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement to part of the technical features; 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 utility model.

Claims

1. A fireproofed prestressed tendon having a multi-layer fireproof structure, characterized in that: The fireproof prestressed tendon comprises a central tendon, an outer periphery of the central tendon is coated with a fireproof coating layer, an outer periphery of the fireproof coating layer is sleeved with a fireproof material sleeve, an outer periphery of the fireproof material sleeve is sleeved with an inner sleeve, the fireproof prestressed tendon further comprises an outer sleeve coaxially sleeved outside the inner sleeve, and a heat insulation fireproof cavity is formed between the inner sleeve and the outer sleeve and arranged around the outer periphery of the fireproof material sleeve.

2. The fireproofed prestressing tendon of claim 1, wherein: The fireproof material sleeve is a prefabricated filling type fireproof material sleeve.

3. The fireproofed prestressing tendon of claim 1, wherein: The inner sleeve and the outer sleeve are steel sleeves.

4. The fireproofed prestressing tendon of claim 1, wherein: The central tendon is a CFRP tendon.

5. The fire resistant prestressing tendon of claim 1, wherein: 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 inner sleeves are referred to as a first inner sleeve and a second inner sleeve, two adjacent outer sleeves 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 inner sleeves and the two adjacent outer sleeves, 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 an outer periphery of the first inner sleeve, and a lower end of the hole wall of the connector central hole is threadedly connected with an outer periphery of the second inner sleeve; an upper end of an outer periphery of the intermediate connector is threadedly connected with an inner periphery of the first outer sleeve, and a lower end of the outer periphery of the intermediate connector is threadedly connected with an inner periphery of the upper end of the second outer sleeve.

6. The fireproofed prestressing tendon of claim 5, wherein: The heat insulation fireproof cavity comprises an upper heat insulation fireproof cavity surrounded by the first outer sleeve and the first inner sleeve and a lower heat insulation 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 intermediate connector, and the connector through holes penetrate the intermediate connector in the up-down direction to realize the communication between the upper heat insulation fireproof cavity and the lower heat insulation fireproof cavity.

7. The fireproofed prestressing tendon according to any one of claims 1 to 6, characterized in that: The fireproof prestressed tendon further comprises an end connector, the end connector comprises a connector end portion, an end connector inner tube fixed to a connector end plate and an end connector outer tube, an inner periphery of the end connector inner tube is threadedly connected with an end portion of the inner sleeve, and an outer periphery of the end connector outer tube is threadedly connected with an end portion of the outer sleeve.

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