Anti-leakage construction method for exhaust passage out of roof

Abstract

The invention discloses an exhaust passage out-of-roof anti-seepage construction method which comprises the following steps: step S1, a structural floor slab and an exhaust shaft pre-pouring section at the bottom of an exhaust shaft are synchronously poured and constructed; s2, the exhaust passage pre-embedded section of the prefabricated exhaust passage is embedded into the formwork assembly; s3, the formwork assembly embedded into the exhaust passage embedded section is erected and fixed to the reserved hole; s4, a post-cast strip is poured and blocked at the reserved hole between the structural floor slab and the exhaust passage pre-buried section; s5, after the post-cast strip to be blocked reaches the design strength, the formwork assembly is dismantled; and S6, pouring construction of an exhaust shaft post-pouring section above the exhaust shaft pre-pouring section and installation construction of an exhaust passage post-installation section below the exhaust passage pre-buried section are conducted. The roof part of the exhaust passage is constructed in a formwork hanging mode, the hanging assembly is ingeniously arranged in the pipe cavity of the embedded section of the exhaust passage, the risk that in a conventional formwork hanging mode, a structural floor needs to be penetrated, and leakage occurs in the plate penetrating position is avoided, the engineering construction quality is ensured, and the construction period is shortened.

Description

Technical Field

[0001] The invention relates to the technical field of waterproof construction of an exhaust duct roof, and in particular to a method for anti-leakage construction of an exhaust duct roof. Background Art

[0002] The prevention of roof leakage is the key and difficulty of the management of each sub-item of the construction project. For residential and apartment projects, there are many roof exhaust wells and the leakage of exhaust wells causes great damage to the building function. Common weak points of roof exhaust well leakage include the installation gap between the exhaust well hood and the exhaust duct structure, the construction joint between the exhaust well and the roof corner, and the gap between the exhaust duct and the exhaust well. There are generally two traditional engineering construction methods. One is to support the formwork and cast concrete to block the gap between the exhaust duct and the floor after the exhaust duct is installed, and then construct the exhaust well structure of the roof. The second is to complete the construction of the exhaust well structure first, then install the exhaust duct, and finally support the formwork. The former has a long overall process flow, which is not conducive to the construction period management and has a high risk of leakage between the well and the floor. The latter is difficult to install and block the exhaust duct after the exhaust well is constructed, which is not conducive to quality control. Moreover, in the above two operation methods, it is often difficult to support the formwork. The hanging formwork method requires passing through the structural floor, and there is a high risk of leakage at the penetration position. The bottom support formwork method has the problem of large workload for frame support, squeezing the construction space of the lower floor, and being easily affected by other operation processes on the lower floor. Summary of the invention

[0003] The purpose of the present invention is to provide a method for preventing leakage of exhaust ducts from roofs, so as to solve the technical problems described in the background technology.

[0004] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: A method for preventing leakage of an exhaust duct roof comprises the following steps: Step S1, the structural floor slab and the exhaust well first pouring section at the bottom of the exhaust well are cast synchronously, and the structural floor slab of the inner enclosed part of the exhaust well first pouring section is not cast temporarily as a reserved hole for installing the prefabricated exhaust duct; Step S2, embedding the exhaust duct embedded section of the prefabricated exhaust duct into the template assembly; Step S3, supporting and fixing the template component embedded in the pre-embedded section of the exhaust duct at the reserved hole, the template component includes a lower limit template, an outer limit template, an upper limit template of the sealing well template and an inner limit template, the lower limit template is correspondingly arranged at the bottom end of the pre-embedded section of the exhaust duct for supporting the pre-embedded section of the exhaust duct, the outer limit template is correspondingly attached to the outer facade of the bottom of the pre-embedded section of the exhaust duct, and its bottom end is fixed to the lower limit template, the sealing well template is correspondingly arranged on the surrounding side of the pre-embedded section of the exhaust duct, its top surface is attached to the structural floor slab, its inner side end abuts against the outer facade of the pre-embedded section of the exhaust duct and is fixedly connected to the outer limit template, its outer side end exceeds the edge of the reserved hole on the outside of the pre-embedded section of the exhaust duct and serves as a bottom template for plugging the post-casting strip at the reserved hole, the upper limit template is correspondingly arranged in the lumen of the pre-embedded section of the exhaust duct, the inner limit template is correspondingly attached to the inner facade of the bottom of the pre-embedded section of the exhaust duct, its top end is fixedly connected to the upper limit template, and its bottom end abuts against the top surface of the lower limit template; Step S4, pouring and sealing the post-cast strip at the reserved hole between the structural floor and the embedded section of the exhaust duct; Step S5, after the plugging post-cast strip reaches the designed strength, the formwork assembly is removed; Step S6, performing the pouring construction of the exhaust well post-casting section above the exhaust well pre-casting section and the installation construction of the exhaust duct post-installation section below the exhaust duct pre-buried section.

[0005] Preferably, the formwork assembly is supported and fixed by a hanging assembly, and the hanging assembly includes a hanging rod and a hook, the hook is arranged at the top of the hanging rod, the bottom end of the hanging rod is fixed on the lower limit formwork, and the top end thereof passes through the upper limit formwork and is hung on the top of the first pouring section of the exhaust shaft by the hook and is tightly fixed by a wooden wedge.

[0006] Preferably, the hook is fixedly arranged at the top end of the suspension rod, and the size of the hook is smaller than the inner diameter of the embedded section of the exhaust duct.

[0007] Preferably, the steps S2 to S3 include: Step S21, the hook and the hanging rod of the hanging assembly are gathered inwards until the embedded section of the exhaust duct can pass through and fall into place; Step S22, passing the embedded section of the exhaust duct through the hook and the hanging rod from top to bottom and embedding it into the slot between the inner limiting template and the outer limiting template; Step S31, inserting the hanging component and the template component embedded in the embedded section of the exhaust duct from bottom to top into the reserved hole; Step S32, unfold the hooks and hanging bars in the contracted state, hang the hooks on the top of the first pouring section of the exhaust shaft and fix them tightly with wooden wedges, ensure that the hanging bars are tightened and the sealing shaft template is pressed against the structural floor slab on the side of the reserved hole.

[0008] Preferably, the step S5 comprises: Step S51, removing the wooden wedge embedded between the hook and the first cast section of the exhaust well; Step S52, manually prying the well sealing template until it is loose; Step S53, removing the hook from the top of the precast section of the exhaust shaft, retracting the hook and the hanging rod inward to a state where they can pass through the pre-buried section of the exhaust duct, and tying and fixing them with ropes; Step S54, lowering the formwork assembly and the hanging assembly together to the lower structure floor by ropes to remove the formwork assembly.

[0009] Preferably, the template assembly is a wooden template, and wooden squares are provided at the outer limit template and the well sealing template, and additional ribs arranged in a mesh shape are provided at the bottom of the lower limit template, and the hanging rods are fixedly connected to the additional ribs.

[0010] Preferably, the gap between the inner limiting template and the outer limiting template is 2-3 mm larger than the wall thickness of the embedded section of the exhaust duct, and a rubber pad is fixedly provided on the top of the outer limiting template.

[0011] Preferably, the length of the exhaust duct pre-buried section below the sealing well template is not less than 90 mm, and the length of the exhaust duct pre-buried section above the structural floor is between 100-150 mm.

[0012] Preferably, the embedded section of the exhaust duct is made by secondary cutting of small sections of leftover material remaining after overall cutting of the prefabricated exhaust duct in consideration of the layer height modulus.

[0013] Preferably, the hanger bar is made of HPB300 steel bar with a diameter of 6-8 mm, and the hook is made of HRB400 steel bar with a diameter of more than 16 mm.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention has a simple structure and is convenient to construct. During the roof pouring construction, the exhaust well is poured once to a height above the roof waterproof layer. Furthermore, through the ingenious arrangement of the exhaust duct pre-buried section, the installation of the exhaust duct out of the roof is completed during the structural construction stage, thereby avoiding the reservation of the roof construction joint in an unfavorable position, ensuring that the construction of the exhaust duct out of the roof is inserted in advance while the roof post-process is being constructed, and effectively shortening the construction period; 2. The present invention uses a hanging formwork to construct the exhaust duct out of the roof, and cleverly sets the hanging assembly in the pre-buried section of the exhaust duct, effectively avoiding the risk of leakage at the penetration position caused by penetrating the structural floor slab in the conventional hanging formwork method, ensuring the quality of the project construction, and also reserving sufficient operating space for the hanging formwork construction and the remaining construction processes on the lower floors, so that there will be no problem of each process occupying the construction space; 3. The combined hanging formwork system adopted in the present invention has high overall integration, high safety, can be repeatedly used, is economical and environmentally friendly, and can be applied to the installation and construction of exhaust ducts in various types of residences and apartments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above and / or other aspects and advantages of the present invention will become clearer and easier to understand through the detailed description made in conjunction with the following drawings, which are only exemplary and do not limit the present invention, wherein: Figure 1 A schematic diagram of a vertical section structure of a combined hanging formwork system for an exhaust duct roof portion involved in the construction method of the present invention; Figure 2 It is a schematic diagram of the top plan structure of a combined hanging formwork system for an exhaust duct roof portion involved in the construction method of the present invention; Figure 3 It is a cross-sectional structural schematic diagram of a combined hanging formwork system for an exhaust duct roof portion involved in the construction method of the present invention; Figure 4 It is a schematic diagram of the upward plane structure of a combined hanging formwork system for an exhaust duct roof portion involved in the construction method of the present invention; Figure 5 It is a schematic diagram of the implementation and installation of a combined hanging formwork system for an exhaust duct roof portion involved in the construction method of the present invention; Figure 6 It is a schematic diagram of the structure after the construction of the prefabricated exhaust duct and exhaust well involved in the construction method of the present invention is completed.

[0016] Figure numerals: 1. Hanging assembly; 101. Hanging rod; 102. Hook; 103. Additional rod; 2. Formwork assembly; 201. Upper limit formwork; 202. Inner limit formwork; 203. Lower limit formwork; 204. Outer limit formwork; 205. Well sealing formwork; 206. Wooden square; 207. Rubber pad; 3. Prefabricated exhaust duct; 301. Exhaust duct pre-buried section; 302. Exhaust duct post-installed section; 4. Structural floor; 5. Exhaust shaft; 501. Exhaust shaft first pouring section; 502. Exhaust shaft post-pouring section; 6. Sealing post-pouring strip; 7. Wooden wedge; 8. Pipe section connecting material. DETAILED DESCRIPTION

[0017] Hereinafter, an embodiment of an exhaust duct roof anti-leakage construction method of the present invention will be described with reference to the accompanying drawings. The embodiments recorded herein are specific embodiments of the present invention, which are used to illustrate the concept of the present invention. They are all explanatory and exemplary and should not be interpreted as limiting the embodiments of the present invention and the scope of the present invention. In addition to the embodiments recorded herein, those skilled in the art can also adopt other obvious technical solutions based on the contents disclosed in the claims and the specification of this application, including technical solutions that adopt any obvious replacements and modifications to the embodiments recorded herein.

[0018] In the description of the present invention, it should be noted that the terms "front", "rear", "left", "right", "top", "bottom", "up", "down", "inside", "outside", "horizontal", "vertical", "upright", "oblique", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc., are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0019] The drawings of this specification are schematic diagrams, which assist in explaining the concept of the present invention and schematically show the shapes of various parts and their mutual relationships. Please note that in order to clearly show the structures of various components of the embodiments of the present invention, the drawings are not drawn according to the same scale. The same reference numerals are used to represent the same parts.

[0020] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The embodiments are only used to explain the present invention and are not used to limit the scope of the present invention. Figure 1-6 , the preferred embodiments of the present invention are further described in detail: like Figure 1-5As shown, first, a combined hanging formwork system for an exhaust duct out of the roof part adopted in a preferred exhaust duct out of the roof anti-leakage construction method of the present invention is introduced, the combined hanging formwork system comprises a prefabricated exhaust duct 3, a formwork assembly 2 and a hanging assembly 1, the prefabricated exhaust duct 3 comprises an exhaust duct pre-embedded section 301 of the exhaust duct out of the roof part and an exhaust duct post-installed section 302 below the exhaust duct pre-embedded section 301, the formwork assembly 2 comprises a lower limit template 203, an outer limit template 204, a sealing well template 205, an upper limit template 201 and an inner limit template 202, the lower limit template 203 is correspondingly arranged at the bottom end of the exhaust duct pre-embedded section 301 for supporting the exhaust duct pre-embedded section 301, the outer limit template 204 is correspondingly attached to the bottom facade of the exhaust duct pre-embedded section 301, and its bottom end is fixed to the lower limit template 203, the sealing well template 205 is correspondingly arranged on the surrounding side of the exhaust duct pre-embedded section 301, Its top surface is attached to the structural floor 4, its inner end abuts against the outer facade of the embedded section 301 of the exhaust duct and is fixedly connected to the outer limiting template 204, its outer end exceeds the edge of the outer reserved hole of the embedded section 301 of the exhaust duct and serves as the bottom template for plugging the post-casting strip 6 at the reserved hole. Therefore, the sealing well template 205 needs to ensure that it can cover the reserved hole of the entire exhaust well 5. The upper limit template 201 is correspondingly arranged in the lumen of the embedded section 301 of the exhaust duct, and the inner limit template 202 is correspondingly attached to the inner facade of the bottom of the embedded section 301 of the exhaust duct, its top end is fixedly connected to the upper limit template 201, and its bottom end abuts against the top surface of the lower limit template 203, the bottom end of the hanging component 1 is fixed on the lower limit template 203, and its top end passes through the upper limit template 201 and is fixed above the structural floor 4, and the hanging component 1 hangs and fixes the template component 2 and the embedded section 301 of the exhaust duct embedded in the template component 2; The hanging assembly 1 includes a hanging rod 101 and a hook 102, wherein the hook 102 is arranged at the top of the hanging rod 101, and the hanging rod 101 is hung at the top of the precast section 501 of the exhaust shaft through the hook 102 and is fixed by a wooden wedge 7; The hook 102 can be fixed on the hanging bar 101 in a detachable manner or in a non-detachable manner. In order to simplify the operation and improve the integration of the entire combined hanging formwork system, in some preferred embodiments, the hook 102 is fixedly arranged on the top of the hanging bar 101 in a non-detachable manner. At this time, during the installation of the formwork component 2, the hanging bar 101 and the hook 102 that exceed the exhaust duct pre-embedded section 301 need to be inserted into the exhaust duct pre-embedded section 301 to ensure that the formwork component 2 can be smoothly inserted into the reserved hole. For this purpose, the size of the hook 102 needs to be smaller than the inner diameter of the exhaust duct pre-embedded section 301. Considering the convenience of obtaining materials at the construction site, in some preferred embodiments, the hanging bar 101 is preferably made of HPB300 steel bars with a diameter of 6-8mm, and the hook 102 is made of HRB400 steel bars with a diameter of more than 16mm. The hanging bar 101 made of small-diameter steel bars can be bent and stored according to needs, and can be stabilized to the required shape after bending, and can also ensure sufficient strength and toughness to provide sufficient tension to ensure the stability of the hanging formwork system. The hook 102 made of large-diameter steel bars needs to be prefabricated into a hook shape, and the size of the hook is determined according to the cross-sectional size of the first pouring section 501 of the exhaust shaft of the construction project. The ribbed large-diameter steel bars have sufficient strength and will not deform after installation. The steel bars on the bars can also play an anti-slip role to ensure the stability of the hanging formwork system after installation. Of course, the hanging bar 101 can also be made of flexible materials such as wire ropes. The specific material selection should be determined according to the use requirements and specific construction scenarios. Also for the convenience of obtaining materials at the construction site, in some preferred embodiments, the template assembly 2 is a wooden template, and wooden squares 206 are provided at the outer limiting template 204 and the sealing template 205 for reinforcement and fixation, so that the sealing template 205, the outer limiting template 204 and the lower limiting template form a whole, and the various parts of the template assembly 2 are connected and fixed by steel nails. In order to ensure the stability of the entire construction process, the inner limiting template 202 can also be nailed to the lower limiting template 20 by steel nails in some preferred embodiments. 3, thereby improving the integrity of the template assembly 2, so that the template assembly 2 as a whole forms a slot tray structure with an inner limit, wherein the upper limit template 201 and the lower limit template 203 are respectively processed with round holes corresponding to the layout positions of the hanging rod 101 for the hanging rod 101 to pass through, and the size of the hole is to ensure that the hanging rod 101 as a sling does not undergo a large displacement as a whole. In the case where the hanging rod 101 adopts a small diameter steel bar, the top of the hanging rod 101 is welded and fixed to the hook 102 in the form of a large diameter steel bar by a lap weld, and the length of the lap weld is The bottom end of the hanging bar 101 passes through the lower limit template 203 and is fixed. At this time, in order to ensure the stability of the wooden template, the bottom of the lower limit template 203 is provided with additional bars 103 arranged in a mesh shape, and the hanging bar 101 and the additional bars 103 are fixedly connected by spot welding seams. The hanging bar 101 and the additional bars 103 are covered to avoid damage to the lower limit template 203. Of course, the number of the hanging bars 101 and the additional bars 103 needs to be calculated and determined according to the specific scenario. Usually, the number of the hanging bars 101 is three. When there are three hanging bars 101, the three hanging bars 101 are passed through six round holes, and the two ends of the hanging bars 101 pass upward from the bottom of the lower limit template 203. The hanging bars 101 at the bottom of the lower limit template 203 play the role of additional bars 103, and form a net bag structure together with the additional bars 103. When there are six hanging bars 101, the bottom end of the hanging bar 101 is bent and attached to the bottom end of the lower limit template 203 to play the role of additional bars 103, and the top end passes through the lower limit template 203 and the upper limit template 201 in turn and is connected with the hook 102; In order to ensure that the embedded section 301 of the exhaust duct can be smoothly embedded in the formwork assembly 2, the gap between the inner limiting formwork 202 and the outer limiting formwork 204 is preferably 2-3 mm larger than the wall thickness of the embedded section 301 of the exhaust duct, and a rubber pad 207 is fixedly provided on the top of the outer limiting formwork 204. The rubber pad 207 can squeeze the embedded section 301 of the exhaust duct to prevent it from deviating from the design axis during the pouring process, and on the other hand, it can also seal the gap between the embedded section 301 of the exhaust duct and the outer limiting formwork 204 tightly, so as to prevent concrete from flowing into the gap between the embedded section 301 of the exhaust duct and the outer limiting formwork 204 when the post-casting strip 6 is poured; As described above, the combined hanging formwork system includes a small section of exhaust duct pre-embedded section 301, and the exhaust duct pre-embedded section 301 is made of a small section of surplus material remaining after the overall cutting and processing of the prefabricated exhaust duct 3 considering the storey height module, and is made by secondary cutting. Considering the overlap between the exhaust duct pre-embedded section 301 and the exhaust duct rear-installed section 302 below, the length of the pipe section of the exhaust duct pre-embedded section 301 below the well sealing template 205 is not less than 90mm. At the same time, considering the construction stability of the entire combined hanging formwork system and the thickness of the structural floor 4, the length of the pipe section of the exhaust duct pre-embedded section 301 above the structural floor 4 is between 100-150mm. Accordingly, the height of the outer limiting template 204 needs to be adaptively adjusted according to the size of the exhaust duct pre-embedded section 301, and the size of the inner limiting template 202 should be similar to that of the outer limiting template 204, but there is no specific size requirement.

[0021] Next, taking the steel bar hanging assembly 1 as an example, a preferred exhaust duct roof anti-leakage construction method of the present invention is introduced. This construction method adopts the above-mentioned exhaust duct roof partial combined hanging formwork system for construction, and specifically includes the following steps: Step S1, the structural floor 4 and the exhaust well first pouring section 501 at the bottom of the exhaust well 5 are poured synchronously, and the structural floor 4 of the inner enclosed part of the exhaust well first pouring section 501 is not poured temporarily as a reserved hole for installing the prefabricated exhaust duct 3; Step S2, embedding the exhaust duct embedded section 301 of the prefabricated exhaust duct 3 into the template assembly 2, and fixing the exhaust duct embedded section 301 by the inner limiting template 202, the outer limiting template 204 and the rubber pad 207, specifically including: Step S21, the hook 102 and the hanging rod 101 of the hanging assembly 1 are gathered inwardly to a position as shown in FIG. Figure 1-2 The exhaust duct embedded section 301 shown can pass through the landing position; Step S22, passing the exhaust duct embedded section 301 through the hook 102 and the hanging rod 101 from top to bottom and embedding it into the slot between the inner limiting template 202 and the outer limiting template 204; Step S3, supporting and fixing the template assembly 2 embedded in the pre-buried section 301 of the exhaust duct at the reserved hole, specifically includes: Step S31, insert the hanging component 1 and the template component 2 embedded in the exhaust duct embedded section 301 from bottom to top into the reserved hole; Step S32, unfold the hook 102 and the hanging rod 101 in the contracted state, hang the hook 102 on the top of the first pouring section 501 of the exhaust shaft and fix it tightly with the wooden wedge 7, ensure that the hanging rod 101 is tightened and the sealing shaft template 205 is pressed against the structural floor 4 on the side of the reserved hole; Step S4, pouring micro-expansion concrete at the reserved hole between the structural floor 4 and the exhaust duct embedded section 301 to form a plugging post-cast strip 6; Step S5, after the plugging post-cast strip 6 reaches the designed strength, the formwork assembly 2 is removed, which specifically includes: Step S51, removing the wooden wedge 7 embedded between the hook 102 and the first casting section 501 of the exhaust well; Step S52, manually prying the well sealing template 205 until it is loose; Step S53, remove the hook 102 from the top of the first pouring section 501 of the exhaust well, and retract the hook 102 and the hanging rod 101 inward again to the position as shown in FIG. Figure 1-2 The state shown in which the exhaust duct pre-embedded section 301 can be passed through is temporarily fixed by a steel pipe during the contraction process, and the suspension bar 101 supported by the small diameter steel bar is tied and fixed with a rope to ensure that the whole contraction can pass through the exhaust duct pre-embedded section 301; Step S54, lowering the formwork assembly 2 and the hanging assembly 1 together to the lower structure floor 4 by ropes to remove the formwork assembly 2; Step S6, casting construction of exhaust well post-casting section 502 above exhaust well pre-casting section 501 and installation construction of exhaust duct post-casting section 302 below exhaust duct pre-buried section 301 are performed. The cross-sectional size and material of exhaust duct post-casting section 302 need to be consistent with those of exhaust duct pre-buried section 301. Figure 6 As shown, after the installation is completed, the pipe section connection material 8 is used for connection. The pipe section connection material 8 is generally a glass fiber mesh cloth and a 8-12mm thick cement mortar. It should be noted that the groove formed during the construction of the sealing post-casting strip 6 due to the rubber pad 207 should be processed by the pipe section connection material 8 during the construction of the exhaust duct connection method, and formed as shown in the figure. Figure 6 As shown in the chamfer, after the above construction is completed, the hanging assembly 1 and the template assembly 2 can be repeatedly transferred to the next construction area and the construction can be repeated according to the above construction method.

[0022] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preventing leakage of exhaust duct roof, characterized in that: The steps include: Step S1, the structural floor slab (4) and the exhaust well first pouring section (501) at the bottom of the exhaust well (5) are cast synchronously, and the structural floor slab (4) of the inner enclosed part of the exhaust well first pouring section (501) is not cast temporarily as a reserved hole for installing the prefabricated exhaust duct (3); Step S2, embedding the exhaust duct embedded section (301) of the prefabricated exhaust duct (3) into the template assembly (2); Step S3, supporting and fixing the template component (2) embedded in the pre-buried section (301) of the exhaust duct at the reserved hole, the template component (2) comprising a lower limit template (203), an outer limit template (204), a sealing well template (205), an upper limit template (201) and an inner limit template (202), the lower limit template (203) being correspondingly arranged at the bottom end of the pre-buried section (301) of the exhaust duct to support the pre-buried section (301) of the exhaust duct, the outer limit template (204) being correspondingly arranged at the bottom outer surface of the pre-buried section (301) of the exhaust duct, and the bottom end of the outer limit template (204) being fixed to the lower limit template (203), the sealing well template (205) being correspondingly arranged at the bottom end of the pre-buried section (301) of the exhaust duct, and the inner limit template (202) being fixed to the lower limit template (203), and the sealing well template (205) being correspondingly arranged at the bottom end of the pre-buried section (301) of the exhaust duct. The top surface of the air duct embedded section (301) is attached to the structural floor (4), the inner end of the air duct embedded section (301) is against the outer facade of the exhaust duct embedded section (301) and is fixedly connected to the outer limiting template (204), the outer end of the air duct embedded section (301) is beyond the edge of the outer reserved hole of the exhaust duct embedded section (301) and serves as the bottom template of the post-casting strip (6) for plugging the reserved hole, the upper limit template (201) is correspondingly arranged in the tube cavity of the exhaust duct embedded section (301), the inner limit template (202) is correspondingly attached to the inner facade of the bottom of the exhaust duct embedded section (301), the top end of the air duct embedded section (301) is fixedly connected to the upper limit template (201), and the bottom end of the air duct embedded section (301) is against the top surface of the lower limit template (203); Step S4, pouring a sealing strip (6) at the reserved hole between the structural floor (4) and the embedded section (301) of the exhaust duct; Step S5, after the plugging post-cast strip (6) reaches the designed strength, the formwork assembly (2) is removed; Step S6, performing the pouring construction of the exhaust well post-casting section (502) above the exhaust well pre-casting section (501) and the installation construction of the exhaust duct post-installation section (302) below the exhaust duct pre-buried section (301).

2. A method for preventing leakage of exhaust duct roof according to claim 1, characterized in that: The template assembly (2) is supported and fixed by a hanging assembly (1), wherein the hanging assembly (1) comprises a hanging rod (101) and a hook (102), wherein the hook (102) is arranged at the top end of the hanging rod (101), the bottom end of the hanging rod (101) is fixed to the lower limit template (203), and the top end thereof passes through the upper limit template (201), is hung on the top end of the exhaust shaft first pouring section (501) through the hook (102), and is fixed by a wooden wedge (7).

3. A method for preventing leakage of exhaust duct roof according to claim 2, characterized in that: The hook (102) is fixedly arranged on the top end of the suspension bar (101), and the size of the hook (102) is smaller than the inner diameter of the pre-embedded section (301) of the exhaust duct.

4. A method for preventing leakage of exhaust duct roof according to claim 3, characterized in that: The steps S2 to S3 include: Step S21, the hook (102) and the hanging rod (101) of the hanging assembly (1) are gathered inwardly until the exhaust duct embedded section (301) can pass through and fall into place; Step S22, passing the exhaust duct embedded section (301) from top to bottom through the hook (102) and the hanging rod (101) and embedding it into the slot between the inner limiting template (202) and the outer limiting template (204); Step S31, inserting the hanging component (1) and the template component (2) embedded in the pre-buried section (301) of the exhaust duct from bottom to top into the reserved hole; Step S32, unfold the hook (102) and the hanging rod (101) in the contracted state, hang the hook (102) on the top of the first pouring section (501) of the exhaust shaft and fix it by plugging it with a wooden wedge (7), ensure that the hanging rod (101) is tightened and the sealing shaft template (205) is pressed against the structural floor (4) on the side of the reserved hole.

5. The method for preventing leakage of exhaust duct roof according to claim 3, characterized in that: The step S5 comprises: Step S51, removing the wooden wedge (7) embedded between the hook (102) and the first cast section (501) of the exhaust shaft; Step S52, manually prying the well sealing template (205) until it is loose; Step S53, removing the hook (102) from the top of the precast section (501) of the exhaust shaft, retracting the hook (102) and the suspension rod (101) inward to a state where they can pass through the pre-buried section (301) of the exhaust duct, and tying and fixing them with ropes; Step S54, lowering the formwork assembly (2) and the hanging assembly (1) together to the lower structure floor (4) by means of ropes to remove the formwork assembly (2).

6. The exhaust duct roof anti-leakage construction method according to claim 2 is characterized in that: The template assembly (2) is a wooden template, and wooden squares (206) are provided at the outer limit template (204) and the well sealing template (205), and additional ribs (103) arranged in a net-like manner are provided at the bottom of the lower limit template (203), and the hanging ribs (101) are fixedly connected to the additional ribs (103).

7. The exhaust duct roof anti-leakage construction method according to claim 1 is characterized by: The gap between the inner limiting template (202) and the outer limiting template (204) is 2-3 mm larger than the wall thickness of the exhaust duct embedded section (301), and a rubber pad (207) is fixedly provided on the top of the outer limiting template (204).

8. The exhaust duct roof anti-leakage construction method according to claim 1 is characterized in that: The length of the pipe section of the pre-buried section (301) of the exhaust duct below the well sealing template (205) is not less than 90 mm, and the length of the pipe section of the pre-buried section (301) of the exhaust duct above the structural floor (4) is between 100 and 150 mm.

9. The exhaust duct roof anti-leakage construction method according to claim 1, characterized in that: The exhaust duct embedded section (301) is manufactured by secondary cutting of small sections of leftover material remaining after overall cutting of the prefabricated exhaust duct (3) taking into account the layer height modulus.

10. The exhaust duct roof anti-leakage construction method according to claim 2, characterized in that: The hanger bar (101) is made of HPB300 steel bars with a diameter of 6-8 mm, and the hook (102) is made of HRB400 steel bars with a diameter of more than 16 mm.

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