CN118876219A - Preparation method of high-strength fire-resistant exhaust duct - Google Patents

Abstract

The invention discloses a preparation method of a high-strength refractory exhaust passage. The preparation method comprises the following steps of A1) preparing light fireproof mortar; step A2) preparing anti-cracking mortar; step A3) preparing a reinforcing material for later use; step A4) preparing a mold, and coating a release agent on the operation surface of a mold plate; step A5) plastering anti-cracking mortar on the surface of the release agent to form an outer surface protective layer, and step A6) paving reinforcing materials on the surface of the outer surface protective layer; step A7), coating and pressing light fireproof mortar layer by layer on the surface of the reinforcing material to form a sandwich heat insulation layer positioned in the middle; step A8), paving reinforcing materials on the surface of the sandwich heat insulation layer; step A9) plastering anti-cracking mortar on the surface of the reinforced material to form an inner surface protective layer; and A10) demolding to obtain a blank, and conveying the obtained blank to a curing workshop for wet curing. The thin-wall exhaust passage prepared by the invention has the advantages of high strength, good fireproof performance and low weight.

Description

Preparation method of high-strength fire-resistant exhaust duct

Technical Field

The invention relates to the field of exhaust ducts, and in particular to a method for preparing a high-strength fire-resistant exhaust duct.

Background Art

Residential exhaust ducts are pipe products used to remove cooking fumes and dirty air from the kitchen and bathroom, and are an important part of the centralized exhaust system of residential kitchens and bathrooms. Existing residential exhaust ducts in my country mainly include two categories: one is the prefabricated steel wire mesh cement pipe made in accordance with the JG/T 194 standard, and the other is the glass fiber reinforced cement exhaust duct made in accordance with the JC/T 854 standard.

Years of practice have proved that the above two types of exhaust ducts generally have the following defects: 1) The fire resistance (especially thermal insulation) of the exhaust duct is poor, which is difficult to meet the set standards and poses a safety hazard; 2) The soft object impact resistance is poor and is prone to damage. At present, the existing technology mainly improves the above performance of the exhaust duct by increasing the overall wall thickness. However, increasing the wall thickness will increase the overall weight of the exhaust duct, which increases the difficulty of construction.

In addition, when thin-walled components in the prior art are combined with the wall to form an exhaust duct, cement mortar is simply applied to the joints for sealing. Since the exhaust duct wall is thin, the strength and rigidity are low, it is easy to cause cracks at the joints when impacted by external forces, resulting in reduced sealing performance and frequent smoke and odor leakage. In the event of a fire, cracks at the joints are likely to occur or spread, posing a safety hazard. Therefore, it is necessary to improve the prior art.

Summary of the invention

In order to at least partially solve the deficiencies in the prior art, the main purpose of the present invention is to provide a method for preparing a high-strength fire-resistant exhaust duct, wherein the prepared exhaust duct has the advantages of high strength, good fire resistance and low weight.

To achieve the above main purpose, the present invention discloses a method for preparing a high-strength fire-resistant exhaust duct, which comprises the following steps:

Step A1) preparing lightweight fireproof mortar;

First, silicate cement, lightweight aggregate and quartz sand are measured and mixed according to a set ratio, and auxiliary materials are added to the mixture to obtain dry powder insulation mortar; then, the dry powder insulation mortar and water are mixed in a container according to a water-cement ratio of 1: (0.7-0.9) and kept stirring until the mixture is stirred into a uniform, particle-free paste, and then left to stand for use;

Step A2) preparing anti-cracking mortar;

First, silicate cement and quartz sand are measured and mixed according to a set ratio, and silica fume, redispersible polymer powder and auxiliary materials are added to the mixture to obtain dry powder anti-cracking mortar; then, the dry powder anti-cracking mortar and water are mixed in a container according to a water-cement ratio of 1: (0.3-0.4) and kept stirring until the mixture is stirred evenly and has a moderate consistency, and then left to stand for use;

Step A3) preparing reinforcement material for standby use;

Step A4) preparing a mold and applying a release agent on the working surface of the mold plate;

Step A5) applying anti-cracking mortar on the surface of the release agent to form an outer surface protective layer, and controlling the thickness of the outer surface protective layer to be 2-5 mm;

Step A6) laying a reinforcing material on the surface of the outer surface protective layer;

Step A7) applying light fireproof mortar layer by layer on the surface of the reinforcement material to form a sandwich insulation layer in the middle, and controlling the thickness of the sandwich insulation layer to be 15-30 mm;

Step A8) laying reinforcing material on the surface of the sandwich insulation layer;

Step A9) applying anti-cracking mortar on the surface of the reinforcing material to form an inner surface protective layer, and controlling the thickness of the inner surface protective layer to be 2-5 mm;

Step A10) After demoulding, an embryo body is obtained, and the obtained embryo body is sent to a curing workshop for wet curing.

According to a specific embodiment of the present invention, the lightweight aggregate in step A1) includes one or more of expanded perlite, expanded vermiculite and expanded vitrified microspheres.

According to a specific embodiment of the present invention, the quartz sand in step A2) includes medium sand and fine sand, wherein the weight of the fine sand is set to be more than twice the weight of the medium sand.

According to a specific embodiment of the present invention, the lightweight fireproof mortar prepared in step A1) is allowed to stand for 3-5 minutes, and then it can be directly used after being stirred evenly again; the anti-cracking mortar prepared in step A2) is allowed to stand for 5-10 minutes, and then it can be directly used after being stirred evenly again.

According to a specific embodiment of the present invention, the reinforcing material in step A3) is galvanized steel wire mesh or alkali-resistant glass fiber mesh cloth.

According to a specific embodiment of the present invention, in step A6), the reinforcing material is pressed into the anti-cracking mortar forming the outer surface protective layer and smoothed; in step A9), the anti-cracking mortar forming the surface protective layer is first filled into the inner reinforcing material during smoothing, and then smoothed layer by layer.

According to a specific embodiment of the present invention, the thickness of the prepared inner surface protective layer and the outer surface protective layer are set to be the same, and the thickness of both is set to not exceed 1/4 of the thickness of the prepared sandwich insulation layer.

According to a specific embodiment of the present invention, after demoulding in step A10), the embryo body is an L-shaped or U-shaped thin-walled component, and the thin-walled component is assembled to the wall through two positioning sealing corner guard plates to form an exhaust duct with the wall; wherein the preparation method further comprises:

Step A11) manufacturing a long strip-shaped positioning sealing corner guard plate, wherein the positioning sealing corner guard plate has a first connecting edge portion and a second connecting edge portion perpendicular to each other, wherein the first connecting edge portion and the second connecting edge portion both extend along the length direction of the thin-walled component;

Step A12) applying adhesive to the outer surface of the first connecting edge portion, and then bonding the positioning sealing corner guard plate to the wall along the installation position of the thin-walled component; then, fixing the positioning sealing corner guard plate to the wall by a plurality of fixing members which are arranged at intervals up and down and penetrate the first connecting edge portion and are installed on the wall;

Step A13) Apply adhesive to the outer surface of the second connecting edge portion, and bond the two open edge portions of the thin-walled component to the second connecting edge portions of the two positioning sealing corner guards respectively, so as to form a rectangular exhaust duct between the thin-walled component and the wall; then, fix the thin-walled component to the positioning sealing corner guard by means of a plurality of fixing parts which are arranged at intervals up and down and penetrate the thin-walled component and are installed on the positioning sealing corner guard.

According to a specific embodiment of the present invention, a notch is provided on the outside of the positioning sealing corner guard plate at the connection between the first connecting edge portion and the second connecting edge portion, and the preparation method further comprises:

Step A14) After the thin-walled component is fixed on the positioning sealing corner guard plate, polymer mortar is applied to the notch and alkali-resistant glass fiber mesh cloth is pasted on the joint.

According to a specific embodiment of the present invention, in step A13) and step A14), when the thin-walled component is fixed on the positioning sealing corner guard plate, the open edge portion of the thin-walled component at least partially covers the notch portion of the positioning sealing corner guard plate, so as to form a dovetail groove structure with a larger inner part and a smaller outer part between the wall, the positioning sealing corner guard plate and the thin-walled component.

The present invention has the following beneficial effects: it provides a preparation method for a high-strength fire-resistant exhaust duct, in which a lightweight fire-proof mortar and an anti-cracking mortar are respectively prepared, wherein the lightweight fire-proof mortar contains non-combustible lightweight aggregate to achieve heat insulation and fire prevention, thereby greatly improving the fire resistance of the exhaust duct; at the same time, because the lightweight fire-proof mortar contains lightweight aggregate, its bulk density will be much smaller than the bulk density of the anti-cracking mortar whose main components are silicate cement and quartz sand. Such an arrangement can not only ensure the overall structural strength, but also increase the overall wall thickness of the exhaust duct while taking into account the weight of the exhaust duct, so that the overall weight of the exhaust duct remains basically unchanged or even reduced, thereby effectively reducing the construction difficulty caused by the weight, and is also conducive to reducing production costs.

In the preparation method of the high-strength fire-resistant exhaust duct provided by the present invention, the reinforcing materials are arranged in the inner surface protective layer and the outer surface protective layer respectively, and are separated by the middle sandwich insulation layer. This arrangement effectively increases the distance between the two layers of reinforcing materials, and maximizes the tensile strength, bending resistance and impact resistance of the exhaust duct.

In the preparation method of the present invention, a special long strip positioning and sealing corner guard plate is provided to assemble and connect the L-shaped or U-shaped thin-walled components, so that the L-shaped or U-shaped thin-walled components can be accurately positioned, so that after the L-shaped or U-shaped thin-walled components are combined with the wall to form an exhaust duct, they will not shift when impacted by external force, and the joints will not crack, thereby ensuring the effectiveness and durability of the sealing at the joints. At the same time, it also has the advantages of simple installation and time-saving and labor-saving.

In order to more clearly illustrate the purpose, technical solutions and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a flow chart of the preparation method of Example 1 of the present invention;

FIG2 is a cross-sectional view of the high-strength fire-resistant exhaust duct prepared in Example 1;

FIG3 is a first preparation flow chart of Example 2 of the preparation method of the present invention;

FIG4 is a diagram showing three exemplary structures of long strip-shaped connecting members;

FIG5 is a second preparation flow chart of Example 2 of the preparation method of the present invention;

FIG6 is a first preparation flow chart of Example 3 of the preparation method of the present invention;

FIG7 is a second preparation flow chart of Example 3 of the preparation method of the present invention;

FIG8 is an enlarged view of the joint of Example 3 of the preparation method of the present invention;

FIG9 is a schematic diagram of a deformed structure of the joint in FIG8 ;

FIG10 is a schematic diagram of another deformed structure of the joint in FIG8;

FIG11 is a schematic diagram of another deformed structure of the joint in FIG8;

FIG12 is a first flow chart of Example 4 of the preparation method of the present invention;

FIG. 13 is a second flow chart of Example 4 of the preparation method of the present invention.

DETAILED DESCRIPTION

In the following description, many specific details are described in conjunction with the embodiments to facilitate a full understanding of the present invention, but it should be understood that the following embodiments and detailed descriptions are only for illustrative purposes and do not limit the scope of protection of the present invention. The proportions of the components in the drawings are only for exemplary display for better illustration and are not intended to limit their true proportions.

Preparation method example 1

The high-strength fire-resistant exhaust duct of the preparation method embodiment 1 is specifically a one-time integrally formed rectangular exhaust duct, as shown in FIG1 , and the preparation method specifically includes the following steps:

Step A1) preparing lightweight fireproof mortar;

First, silicate cement, lightweight aggregate and quartz sand are measured and mixed according to a set ratio, and auxiliary materials are added to the mixture to obtain dry powder insulation mortar; then, the dry powder insulation mortar and water are mixed in a container according to a water-cement ratio of 1: (0.7-0.9) and kept stirring until the mixture is stirred into a uniform, particle-free paste, and then allowed to stand for use; the standing time is preferably 3-5 minutes, for example 5 minutes, and then stirred again to be uniform and can be used directly;

Furthermore, the lightweight aggregate in step A1) includes one or more of expanded perlite, expanded vermiculite and expanded vitrified microspheres. To achieve control of the bulk density of the sandwich insulation layer, preferably, the weight ratio of silicate cement to lightweight aggregate/lightweight aggregate mixture is preferably controlled at 1:(0.7-1).

Exemplarily, the sandwich insulation layer includes the following components by weight: silicate cement: 30-60 parts, lightweight aggregate: 20-40 parts, quartz sand: 5-15 parts, redispersible polymer powder: 1-2 parts, air entraining agent (foaming agent): 1-3 parts, polypropylene chopped fibers: 0.5-3 parts, water reducer: 0.5-1 parts, hydroxypropyl methylcellulose: 0.5-1 parts.

The particle size of the lightweight aggregate in the lightweight aggregate is selected to be less than 10 mm, specifically including large-size aggregate with a particle size of 5 mm-10 mm, medium-size aggregate with a particle size of 2 mm-5 mm, and small-size aggregate with a particle size below 2 mm; wherein the volume ratio of large-size aggregate, medium-size aggregate and small-size aggregate is 1: (1-2): (0.8-1.5), for example, large-size aggregate accounts for 30% of the weight ratio of lightweight aggregate, medium-size aggregate accounts for 40% of the weight ratio of lightweight aggregate, and small-size aggregate accounts for 30% of the weight ratio of lightweight aggregate. In the embodiment, by further limiting the particle size of the lightweight aggregate, the overall state of the sandwich insulation layer slurry can be taken into account while ensuring the thermal insulation performance, which is conducive to maintaining its relatively stable structural strength.

Step A2) preparing anti-cracking mortar;

First, silicate cement and quartz sand are measured and mixed according to a set ratio, and silica fume, redispersible polymer powder and auxiliary materials are added to the mixture to obtain dry powder anti-cracking mortar; then, the dry powder anti-cracking mortar and water are mixed in a container according to a water-cement ratio of 1: (0.3-0.4) and kept stirring until the mixture is stirred evenly and has a moderate consistency, and then allowed to stand for use; the standing time is preferably 5-10 minutes, for example 8 minutes, after which it can be directly used after being stirred evenly again.

For example, the anti-cracking mortar includes the following components by weight: Portland cement: 20-40 parts, quartz sand: 50-85 parts, silica fume: 2-3 parts, redispersible polymer powder: 3-5 parts, lignin: 0.1-0.3 parts, water reducer: 0.2-0.5 parts, hydroxypropyl methylcellulose: 0.2-0.5 parts, polypropylene short fibers: 0.5-2 parts. Among them, the main purpose of silica fume is to improve the overall physical properties and durability, the water reducer is mainly used to improve strength and workability, the hydroxypropyl methylcellulose is mainly used to improve water retention, and the polypropylene short fibers are mainly used to improve crack resistance.

Further, the weight ratio of silicate cement to quartz sand is 1:(1.5-2.5); wherein the quartz sand includes medium sand and fine sand, and the weight proportions of medium sand and fine sand are respectively: 10-25 parts of medium sand and 40-60 parts of fine sand. In the embodiment, the weight of the fine sand is preferably set to be more than twice the weight of the medium sand. By limiting the ratio of medium sand to fine sand, the smooth surface effect of the surface protective layer can be improved while ensuring the high strength of the structure.

Step A3) preparing reinforcement material for standby use;

Specifically, for the steel mesh cement prefabricated thin-wall exhaust duct manufactured according to JG/T 194 standard, the reinforcing material in the inner surface protective layer and the outer surface protective layer is specifically hot-dip galvanized steel wire mesh, and the weight of the hot-dip galvanized steel wire mesh in the unit expansion area of the exhaust duct should not be less than 1.0kg/ ^m2 ; for the exhaust duct manufactured according to JC/T 854 standard, the reinforcing material in the inner surface protective layer and the outer surface protective layer is specifically alkali-resistant glass fiber mesh cloth, and the weight of the alkali-resistant glass fiber mesh cloth in the unit expansion area of the exhaust duct should not be less than 0.5kg/ ^m2 .

Step A4) preparing the mold 101, supporting the mold plates on both sides of the exhaust duct and the bottom mold plate, and applying a mold release agent on the operating surface (inner surface) of the mold plate;

Step A5) Apply anti-cracking mortar on the surface of the mold plate coated with the release agent to form an outer surface protective layer 1, and control its thickness to be 2-5 mm, specifically 4 mm.

Step A6) laying the outer reinforcement material 2 on the surface of the outer surface protection layer 1, wherein the outer reinforcement material 2 is pressed into the outer surface protection layer 1 and smoothed;

Step A7) Apply lightweight fireproof mortar layer by layer to form a sandwich insulation layer 3 located in the middle, and control its thickness to be 15-30 mm. Exemplarily, the thickness of the sandwich insulation layer 3 after applying is 20 mm.

Step A8) laying the inner reinforcement material 4 on the surface of the sandwich insulation layer 3;

Step A9) Apply anti-cracking mortar on the surface of the inner reinforcement material 4 to form an inner surface protective layer 5, and control its thickness to be 2-5 mm, specifically 4 mm. When applying, first fill the anti-cracking mortar into the inner reinforcement material 4, and then apply it layer by layer.

Among them, chamfers are made at the corners of the side formwork and the bottom formwork to further improve the structural strength.

Further comprising: supporting the exhaust duct top template 102, applying a demoulding agent on the operating surface of the top template 102; applying anti-cracking mortar on the demoulding agent surface of the top template 102 to form an inner surface protective layer 5, and keeping the inner surface protective layer 5 the same thickness as the aforementioned; laying the inner reinforcement material 4 on the surface of the inner surface protective layer 5 again, applying lightweight fireproof mortar on the surface of the inner reinforcement material 4 to form a sandwich insulation layer 3, and keeping the sandwich insulation layer 3 the same thickness as the aforementioned; laying the outer reinforcement material 2 on the surface of the sandwich insulation layer 3 again, applying anti-cracking mortar on the surface of the outer reinforcement material 2 to form an outer surface protective layer 1, and keeping the outer surface protective layer 1 the same thickness as the aforementioned;

Step A10) After demoulding, a rectangular embryo 103 is obtained, and the obtained rectangular embryo 103 is sent to a curing workshop for wet curing to obtain a finished high-strength fire-resistant exhaust duct, wherein the longitudinal section of the rectangular high-strength fire-resistant exhaust duct is shown in FIG. 2 .

Preparation method example 2

The lightweight fireproof mortar, anti-cracking mortar and reinforcing materials used in Preparation Method Example 2 are the same as those in Preparation Method Example 1. The main difference between Preparation Method Example 2 and Preparation Method Example 1 is that a plate-shaped embryo 201 is first manufactured, and then four finished plate-shaped embryos 201 are assembled to form a rectangular exhaust duct.

As shown in FIG3 , the method for preparing the plate-shaped embryo 201 of this embodiment specifically includes the following steps:

Step A1) preparing lightweight fireproof mortar;

Step A2) preparing anti-cracking mortar;

Step A3) preparing reinforcement material for standby use;

Step A4) preparing a flat plate mold 202 and applying a release agent on the operating surface of the mold plate;

Step A5) Apply anti-cracking mortar on the surface of the mold plate coated with the release agent to form an outer surface protective layer 1, and control the thickness of the outer surface protective layer 1 to be 2-5 mm, specifically 3 mm.

Step A6) laying an external reinforcement material 2 on the surface of the outer surface protective layer 1, and pressing the external reinforcement material 2 into the anti-cracking mortar forming the outer surface protective layer 1;

Step A7) Lightweight fireproof mortar is applied layer by layer on the surface of the outer reinforcement material 2 to form a sandwich insulation layer 3 located in the middle, and the thickness of the sandwich insulation layer 3 is controlled to be 15-30 mm, specifically 25 mm.

Step A8) laying the inner reinforcement material 4 on the surface of the sandwich insulation layer 3;

Step A9) Anti-cracking mortar is applied on the surface of the inner reinforcement material 4 to form an inner surface protective layer 5. The thickness of the inner surface protective layer 5 is controlled to be 2-5 mm, preferably the same as the thickness of the outer surface protective layer 1.

Step A10) After demoulding, a plate-shaped embryo body 201 is obtained, and the obtained plate-shaped embryo body 201 is sent to a curing workshop for wet curing to obtain a high-strength and fire-resistant finished plate-shaped embryo body.

Furthermore, the four finished plate-like embryos are assembled together by connecting members 6; wherein the cross-sectional shape of the connecting member 6 is specifically L-shaped, triangular or rectangular as shown in FIG4 , and the connecting member 6 is preferably made of the aforementioned anti-cracking mortar, and can also be made of metal plates (such as angle steels) and the like. The specific assembly process is shown in FIG5 , firstly, an adhesive (such as tile adhesive) is used to bond a connecting member 6 to one side of each finished plate-like embryo 201, and a fixing member such as a screw or an air gun nail is used to securely fix the connection; then, an adhesive (such as tile adhesive) is applied to the contact surface of the four finished plate-like embryos 201 and the adjacent connecting members 6 to assemble to form a rectangular exhaust duct; finally, a fixing member such as a screw or an air gun nail is used to form a reliable connection between each plate-like embryo 201 and the connecting member 6.

Preparation method example 3

The lightweight fireproof mortar, anti-cracking mortar and reinforcing materials used in Preparation Method Example 3 are the same as those in Preparation Method Example 1. The main difference between Preparation Method Example 3 and Preparation Method Example 1 is that the L-shaped thin-walled component 301 is produced, and the L-shaped thin-walled component 301 can be combined with the surface of the wall 302 to form a rectangular exhaust duct.

As shown in FIG6 , the preparation method of this embodiment specifically includes the following steps:

Step A1) preparing lightweight fireproof mortar;

Step A2) preparing anti-cracking mortar;

Step A3) preparing reinforcement material for standby use;

Step A4) preparing an L-shaped mold 303 and applying a mold release agent on the operating surface (inner surface) of the mold plate;

Step A5) Apply anti-cracking mortar on the surface of the mold plate coated with the release agent to form an outer surface protective layer 1, and the thickness of the outer surface protective layer 1 is controlled to be 2-5 mm.

Step A6) laying an outer reinforcement material 2 on the surface of the outer surface protective layer 1;

Step A7) Lightweight fireproof mortar is applied layer by layer on the surface of the outer reinforcement material 2 to form a sandwich insulation layer 3 located in the middle, and the thickness of the sandwich insulation layer 3 is controlled to be 15-30 mm.

Step A8) laying the inner reinforcement material 4 on the surface of the sandwich insulation layer 3;

Step A9) Anti-cracking mortar is applied on the surface of the inner reinforcement material 4 to form an inner surface protective layer 5. The thickness of the inner surface protective layer 5 is controlled to be 2-5 mm, preferably the same as the thickness of the outer surface protective layer 1.

Step A10) After demoulding, an L-shaped embryo body 302, i.e., an L-shaped thin-walled component, is obtained; the obtained L-shaped embryo body 302 is sent to a curing workshop for wet curing to obtain an L-shaped finished embryo body.

Furthermore, the obtained L-shaped finished embryo (thin-wall component) is assembled onto the wall 302 through two positioning sealing corner guard plates 304 and combined with the wall 302 to form a rectangular exhaust duct, and the specific process is shown in FIG. 7 ; wherein, the preparation method (also known as the forming method) of the high-strength fire-resistant exhaust duct further includes the following steps:

Step A11) manufacturing a long strip-shaped positioning sealing corner guard plate 304, wherein the positioning sealing corner guard plate 304 has a first connecting edge portion 304a and a second connecting edge portion 304b perpendicular to each other, wherein the first connecting edge portion 304a and the second connecting edge portion 304b both extend along the length direction of the thin-walled component;

Specifically, the positioning sealing corner guard plate 304 is preferably made of the anti-cracking mortar in step A2, which has the same service life as thin-walled components; in some embodiments, the positioning sealing corner guard plate 304 can also be made of steel materials such as angle steel. Exemplarily, the cross-section of the positioning sealing corner guard plate 304 is L-shaped. In other embodiments, the cross-section shape of the positioning sealing corner guard plate 304 can also be rectangular or triangular, or polygonal or other irregular shapes. This is not limited here and will not be expanded one by one by examples; preferably, the shape of the positioning sealing corner guard plate 304 is the same as the cross-sectional shape of the long strip connecting member 6 shown in Figure 4, and the size can be enlarged or reduced as needed.

Step A12) First, apply adhesive, such as tile adhesive, on the outer surface of the first connecting edge portion 304a, and then adhere the positioning sealing corner guard plate 304 (specifically the first connecting edge portion 304a) to the wall 302 along the installation position of the thin-walled component; then, fix the positioning sealing corner guard plate 304 to the wall 302 through a plurality of fixing members 7 that are arranged at intervals up and down and penetrate the first connecting edge portion 304 and are installed on the wall; wherein the fixing members 7 here can be easy-to-use connecting fixing members such as chemical bolts, expansion bolts or cement nails.

Step A13) Then, apply adhesive on the outer surface of the second connecting edge portion 304b, and bond the two open edge portions 301a of the thin-walled component to the second connecting edge portions 304b of the two positioning sealing corner guards 304 respectively, so as to form a rectangular exhaust duct between the thin-walled component and the wall 302; then, fix the thin-walled component to the positioning sealing corner guard 304 through a plurality of fixing parts 7 which are arranged at intervals up and down and penetrate the thin-walled component and are installed on the positioning sealing corner guard 304; wherein, the fixing parts 7 here can be chemical bolts, expansion bolts or cement nails and other easy-to-use connecting fixing parts.

In the embodiment, a notch portion 304c is provided on the outside of the positioning sealing corner guard plate 304 at the connection between the first connecting edge portion 304a and the second connecting edge portion 304b, as shown in FIG8 ; wherein the preparation method further comprises: step A14) after the thin-walled member is fixed on the positioning sealing corner guard plate 304, polymer mortar is applied to the notch portion 304c to achieve bonding; the presence of the notch portion 304c here can help to accommodate more adhesive, thereby forming a better sealing effect on the joint.

Further, please continue to refer to Figure 8. When the thin-walled component is fixed on the positioning sealing corner guard 304, the open edge portion 301a of the thin-walled component preferably at least partially covers the notch portion 304c of the positioning sealing corner guard 304, so as to form a dovetail groove structure 305 with a large inside and a small outside between the wall 302, the positioning sealing corner guard 304 and the thin-walled component 301; compared with the traditional sealing method of plastering at the gap, the dovetail groove structure 305 can help prevent the polymer mortar from falling off, thereby improving the sealing effect at the joint.

As shown in Figure 9, as a deformation of the above-mentioned notch portion 304c, the opening of the notch portion 304c gradually becomes smaller from the inside to the outside, that is, the cross-section of the open edge portion 301a of the thin-walled member is formed into an inclined shape, which can also prevent the polymer mortar filled in the notch portion 304c from detaching; preferably, an alkali-resistant glass fiber mesh cloth 306 can also be attached to the outside of the notch portion 304c at the joint, and the alkali-resistant glass fiber mesh cloth 306 is preferably about 100 mm in the left and right directions in Figure 9, which can better protect the polymer mortar at the joint and improve the connection strength at the joint.

As another variation of the above embodiment, as shown in FIG. 10 , the side of the open edge portion 301a of the thin-walled component is preferably provided with a connecting plate 307 protruding outward, and correspondingly, a plug-in groove is provided on the wall 302, which may be a slit groove obtained by on-site construction. When the thin-walled component is installed in place, the connecting plate 307 extends into the plug-in groove to achieve positioning.

Furthermore, the fixing member 7 may also penetrate the connecting plate 307 and pass through or penetrate into the second connecting edge portion 304 b to connect the thin-walled member and the positioning sealing corner guard plate 304 together.

As another variation of the above embodiment, as shown in FIG11 , a recessed receiving groove 308 is provided on the wall 302 corresponding to the first connecting edge portion 304a, and the first connecting edge portion 304a is at least partially buried in the receiving groove 308; preferably, the first connecting edge portion 304a is completely buried in the receiving groove 308 to facilitate a more stable connection. The receiving groove 308 is filled with sealing mortar, which is more conducive to providing a better sealing effect.

Among them, the groove width of the receiving groove 308 is relatively large, which is beneficial to the installation of the first connecting edge portion 304a on the one hand, and can accommodate more sealing mortar on the other hand; wherein, the open edge portion 301a of the thin-walled component can also be arranged not to extend into the receiving groove 308, so that the sealing mortar accommodated in the receiving groove 308 can be blocked in the receiving groove 308 by the side of the open edge portion 301a and will not overflow.

Preparation method example 4

The lightweight fireproof mortar, anti-cracking mortar and reinforcing materials used in Preparation Method Example 4 are the same as those in Preparation Method Example 1. The main difference between Preparation Method Example 4 and Preparation Method Example 3 is that, as shown in Figures 12-13, a U-shaped thin-walled component 401 is produced, and the U-shaped thin-walled component 401 can be combined with a wall with a corner to form an exhaust duct. The production process of Preparation Method Example 4 is the same as that of Preparation Method Example 3, and will not be expanded here.

The performance of the lightweight fireproof mortar used to make the sandwich insulation layer 3 in the manufacturing method embodiments 1-4 is verified below through test examples 1-4.

In Test Example 1, the lightweight fireproof mortar for preparing the sandwich insulation layer 3 adopts the following components by weight: 150 kg of 42.5 grade silicate cement, 120 kg of expanded glass beads, 30 kg of quartz sand, 5 kg of redispersible polymer powder, 4 kg of air entraining agent, 2 kg of polypropylene chopped fibers, 3 kg of high-efficiency water reducing agent, and 2 kg of hydroxypropyl methylcellulose.

In Test Example 2, the lightweight fireproof mortar for preparing the sandwich insulation layer 3 adopts the following components by weight: 150 kg of 42.5 grade silicate cement, 130 kg of expanded vermiculite particles, 30 kg of quartz sand, 5 kg of redispersible polymer powder, 3 kg of air entraining agent, 3 kg of polypropylene chopped fibers, 3 kg of high-efficiency water reducing agent, and 2 kg of hydroxypropyl methylcellulose.

In Test Example 3, the lightweight fireproof mortar for preparing the sandwich insulation layer 3 adopts the following components by weight: 150kg of 42.5 grade silicate cement, 140kg of expanded perlite particles, 30kg of quartz sand, 5kg of redispersible polymer powder, 3kg of air entraining agent, 3kg of polypropylene chopped fibers, 3kg of high-efficiency water reducing agent, and 2kg of hydroxypropyl methylcellulose.

In Test Example 4, the lightweight fireproof mortar for preparing the sandwich insulation layer 3 adopts the following components by weight: 150 kg of 42.5 grade silicate cement, 60 kg of expanded glass beads, 60 kg of expanded vermiculite, 20 kg of quartz sand, 5 kg of redispersible polymer powder, 3 kg of air entraining agent, 3 kg of polypropylene chopped fibers, 4 kg of high-efficiency water reducing agent, and 2 kg of hydroxypropyl methylcellulose.

The water-cement ratio (dry powder insulation mortar: water) of Test Examples 1-4 is 1:(0.7-0.9), and here it is uniformly carried out according to a water-cement ratio of 1:0.8; the specific production method is: mix the dry powder insulation mortar and water in a container according to the set water-cement ratio and keep stirring until the mixture is stirred into a uniform, particle-free paste, let it stand for use, and stir it evenly again before use.

Among them, the paste-like lightweight fireproof slurry of the above test examples 1-4 was used to make a board with a length, width and height of 40mm×40mm×160mm, and was tested in accordance with the implementation standards of GB/T 26000-2010 "Expanded Vitrified Microsphere Thermal Insulation Mortar" and GB/T 20473-2021 "Building Thermal Insulation Mortar", and the data obtained are shown in the following table:

It can be seen from the above data that the sandwich insulation layers 3 prepared in Test Examples 1-4 all meet the following requirements: bulk density: ≤350kg/m ³ , thermal conductivity ≤0.080W/(m·K), compressive strength: ≥0.7Mpa, linear shrinkage: ≤0.3%, combustion performance: Class A non-combustible material; the above experimental results show that the sandwich insulation layers 3 prepared in the embodiments meet the relevant standards and requirements for high-strength fire resistance.

The performance of the anti-cracking mortar used to make the surface protective layer in the above-mentioned embodiments 1-4 is verified by test examples 5-8.

In Test Example 5, the anti-cracking mortar for preparing the surface protective layer adopts the following components by weight: 42.5 grade silicate cement: 350kg, medium sand (40-70 mesh): 200kg, fine sand (60-150 mesh): 500kg, silica fume: 20kg, redispersible polymer powder: 30kg, lignin: 3kg, water reducer: 3kg, hydroxypropyl methylcellulose: 3kg, polypropylene chopped fibers: 6kg.

In Test Example 6, the anti-cracking mortar for preparing the surface protective layer adopts the following components by weight: 42.5 grade silicate cement: 300kg, medium sand (40-70 mesh): 200kg, fine sand (60-150 mesh): 500kg, silica fume: 20kg, redispersible polymer powder: 30kg, lignin: 3kg, water reducer: 5kg, hydroxypropyl methylcellulose: 5kg, polypropylene chopped fibers: 10kg.

In Test Example 7, the anti-cracking mortar for preparing the surface protective layer adopts the following components by weight: 42.5 grade silicate cement: 250kg, medium sand (40-70 mesh): 200kg, fine sand (60-150 mesh): 500kg, silica fume: 20kg, redispersible polymer powder: 30kg, lignin: 3kg, water reducer: 5kg, hydroxypropyl methylcellulose: 5kg, polypropylene chopped fibers: 15kg.

In Test Example 8, the anti-cracking mortar for preparing the surface protective layer adopts the following components by weight: 42.5 grade silicate cement: 400kg, medium sand (40-70 mesh): 200kg, fine sand (60-150 mesh): 500kg, silica fume: 30kg, redispersible polymer powder: 40kg, lignin: 3kg, water reducer: 5kg, hydroxypropyl methylcellulose: 5kg, polypropylene chopped fibers: 20kg.

The water-cement ratio (dry powder anti-cracking mortar: water) of Test Examples 5-8 is 1:(0.3-0.4), and here it is uniformly carried out according to a water-cement ratio of 1:0.35; the specific production method is: mix the dry powder anti-cracking mortar and water in a container according to the set water-cement ratio and keep stirring until the mixture is evenly stirred and has a moderate consistency, let it stand for use, and stir it evenly again before use.

Among them, the anti-cracking mortar of the above test examples 5-8 was used to make a plate with a length, width and height of 40mm×40mm×160mm, and tested in accordance with the implementation standard of GB/T 4100-2015 "Building Mortar", and the data obtained are shown in the following table:

Test weight Tensile Strength Compressive strength Linear shrinkage Water resistance Test Example 5 1665 1.5 25 0.07 qualified Test Example 6 1620 1.8 twenty three 0.06 qualified Test Example 7 1602 2.1 twenty one 0.05 qualified Test Example 8 1743 1.4 28 0.08 qualified

From the above data, it can be seen that the surface protective layers prepared in Test Examples 5-8 all meet the following requirements: bulk density: ≥1500kg/m ³ , tensile strength: ≥1.0MPa, compressive strength: ≥20Mpa, linear shrinkage: ≤0.1%, water resistance: qualified; the above experimental results show that the surface protective layers prepared in the examples all meet the relevant standards and requirements for height.

Although the present invention has been described above through embodiments, the above embodiments are only used to exemplarily describe the feasible implementation schemes of the present invention, and are not used to limit the protection scope of the present invention. Any equivalent substitutions or changes made by those skilled in the art in accordance with the present invention should also be covered by the protection scope defined by the claims of the present invention.

Claims (10)

1. The preparation method of the high-strength refractory exhaust passage is characterized by comprising the following steps of:

Step A1), preparing light fireproof mortar;

Firstly, silicate cement, lightweight aggregate and quartz sand are metered and mixed according to a set proportion, and auxiliary materials are added into the mixture to obtain dry powder heat insulation mortar; then, the dry powder heat insulation mortar and water are mixed according to the following ratio of 1: mixing the water cement ratio of (0.7-0.9) in a container and keeping stirring until the mixture is stirred into uniform and particle-free paste, and standing for later use;

Step A2) preparing anti-cracking mortar;

Firstly, silicate cement and quartz sand are metered and mixed according to a set proportion, and silica fume, redispersible polymer rubber powder and auxiliary materials are added into the mixture to obtain dry powder anti-cracking mortar; then, the dry powder anti-cracking mortar and water are mixed according to the following ratio of 1: mixing the water cement ratio of (0.3-0.4) in a container and keeping stirring until the mixture is uniformly stirred and has moderate consistency, and standing for later use;

step A3) preparing a reinforcing material for later use;

Step A4) preparing a mold, and coating a release agent on the operation surface of a mold plate;

step A5), plastering anti-cracking mortar on the surface of the release agent to form an outer surface protective layer, and controlling the thickness of the outer surface protective layer to be 2-5mm;

step A6), paving reinforcing materials on the surface of the outer surface protective layer;

Step A7), coating and pressing light fireproof mortar layer by layer on the surface of the reinforcing material to form a sandwich heat insulation layer positioned in the middle, wherein the thickness of the sandwich heat insulation layer is controlled to be 15-30mm;

Step A8), paving reinforcing materials on the surface of the sandwich heat insulation layer;

step A9) plastering anti-cracking mortar on the surface of the reinforced material to form an inner surface protection layer, and controlling the thickness of the inner surface protection layer to be 2-5mm;

and A10) demolding to obtain a blank, and conveying the obtained blank to a curing workshop for wet curing.

2. The method for manufacturing a high-strength refractory exhaust passage according to claim 1, characterized in that: the lightweight aggregate in step A1) includes one or more of expanded perlite, expanded vermiculite, and expanded vitrified microbeads.

3. The method for manufacturing a high-strength refractory exhaust passage according to claim 1, characterized in that: the quartz sand in step A2) includes medium sand and fine sand, wherein the weight of the fine sand is set to be more than twice the weight of the medium sand.

4. The method for manufacturing a high-strength refractory exhaust passage according to claim 1, characterized in that: the standing time period of the light fireproof mortar prepared in the step A1) is 3-5 minutes, and then the light fireproof mortar can be directly used after being stirred uniformly again; the standing time period of the prepared anti-cracking mortar in the step A2) is 5-10 minutes, and then the anti-cracking mortar can be directly used after being stirred uniformly again.

5. The method for manufacturing a high-strength refractory exhaust passage according to claim 1, characterized in that: the reinforcing material in the step A3) is galvanized steel wire mesh or alkali-resistant glass fiber mesh cloth.

6. The method for manufacturing a high-strength refractory exhaust passage according to claim 1, characterized in that: in the step A6), the reinforcing material is pressed into the anti-cracking mortar forming the outer surface protective layer and trowelled; and A9) filling the anti-cracking mortar forming the surface protection layer into the inner reinforcing material during the plastering, and then performing layer-by-layer plastering.

7. The method for manufacturing a high-strength refractory exhaust passage according to claim 1, characterized in that: the thicknesses of the prepared inner surface protective layer and the prepared outer surface protective layer are set to be the same, and the thicknesses of the inner surface protective layer and the outer surface protective layer are set to be not more than 1/4 of the thickness of the prepared sandwich heat insulation layer.

8. The method for manufacturing a high-strength refractory exhaust passage according to claim 1, characterized in that: step A10), demolding to obtain a thin-wall member with an L-shaped or U-shaped blank, and assembling the thin-wall member on a wall body through two positioning corner sealing plates to form an exhaust passage with the wall body; wherein, the preparation method further comprises:

Step A11) manufacturing a strip-shaped positioning seal corner plate, wherein the positioning seal corner plate is provided with a first connecting edge part and a second connecting edge part which are perpendicular to each other, and the first connecting edge part and the second connecting edge part extend along the length direction of the thin-wall member;

Step A12), coating adhesive on the outer side surface of the first connecting edge part, and then adhering the positioning sealing corner plate to the wall body along the installation position of the thin-wall member; then, fixing the positioning corner sealing plate on the wall body through a plurality of fixing pieces which are arranged at intervals up and down and penetrate through the first connecting edge part to be mounted on the wall body;

Step A13), adhesive is smeared on the outer side surface of the second connecting edge part, two open edge parts of the thin-wall component are respectively and correspondingly adhered to the second connecting edge parts of the two positioning seal corner plates, and a rectangular exhaust passage is formed between the thin-wall component and the wall body in a combined mode; then, the thin-wall member is fixed on the positioning seal corner plate by a plurality of fixing pieces which are arranged at intervals up and down and penetrate through the thin-wall member to be mounted on the positioning seal corner plate.

9. The method for manufacturing a high-strength refractory exhaust duct according to claim 8, wherein: the outside of the positioning seal corner plate is provided with a notch part at the joint of the first connecting edge part and the second connecting edge part, and the preparation method further comprises the following steps:

And A14) after the thin-wall member is fixed on the positioning sealing corner plate, smearing polymer mortar in the notch part, and attaching alkali-resistant glass fiber mesh cloth at the joint.

10. The method for manufacturing a high-strength refractory exhaust duct according to claim 9, wherein: in the step A13) and the step A14), when the thin-wall member is fixed on the positioning seal corner plate, the open edge part of the thin-wall member at least partially covers the notch part of the positioning seal corner plate so as to form a dovetail groove structure with large inside and small outside among the wall body, the positioning seal corner plate and the thin-wall member.