A method for adding eaves to an existing building

Abstract

The invention discloses a method for adding eaves to an existing building, comprising the following construction steps: drilling a hole at the lower part of a parapet wall of a roof, inserting a cantilevered square steel into the hole, wherein one end of the cantilevered square steel is cantilevered outside the building, and the other end of the cantilevered square steel is placed on the roof of the building; forming a weight on the cantilevered square steel at the other end of the cantilevered square steel on the roof of the building; laying a top pressure beam on the top of the parapet wall; laying an eaves beam outside one end of the cantilevered cantilevered square steel; laying a supporting beam at the junction of the parapet wall facade and the cantilevered square steel; at each cantilevered square steel, connecting the top pressure beam and the eaves beam with a steel section to form an inclined beam; laying a connecting beam between the eaves beam and the supporting beam, and laying a sealing plate on the plane formed by the eaves beam, the supporting beam, and the connecting beam. The present application can make the added eaves, the parapet wall, and the roof form a whole by fixing the cantilevered square steel on the roof of the building, and has a good ability to resist wind damage.

Description

Technical Field

[0001] The invention relates to the field of building reconstruction, and in particular to a method for adding eaves to an existing building. Background Art

[0002] In the beautification and renovation of old residential areas, adding eaves and redecorating exterior walls is called a "dressing and hatting" project. Among them, the common method of adding eaves is to construct a triangular steel frame on the exterior wall of the building and then lay glazed tiles on it. The connection strength between the eaves and the wall constructed by this method is insufficient and can be easily blown away in strong winds, posing certain safety hazards. Summary of the invention

[0003] Based on this, in order to solve the problem that the existing technical solution for adding eaves is insufficient, the present invention provides a method for adding eaves to an existing building, and the specific technical solution is as follows:

[0004] A method for adding eaves to an existing building comprises the following construction steps:

[0005] S1. Drill a hole at the bottom of the roof parapet and insert a cantilevered square steel into the hole, wherein one end of the cantilevered square steel is cantilevered outside the building and the other end is placed on the roof of the building;

[0006] S2. At the other end of the cantilevered square steel of the building roof, a template is laid and steel bars are welded to form an anchor beam, so that the cantilevered square steel is embedded in the anchor beam and connected to the steel bar, and then concrete is poured in the template to form a weight on the cantilevered square steel;

[0007] S3. Lay a continuous top beam square steel on the top of the parapet to form a top beam, and fix it to the parapet with bolts; lay a continuous eaves beam square steel on the outside of one end of the cantilevered cantilevered square steel to form an eaves beam, and weld it to fix it; lay a continuous supporting beam square steel at the junction of the parapet facade and the cantilevered square steel to form a supporting beam, and weld it to fix it;

[0008] S4. At each cantilevered square steel, use steel sections to connect the top beam and the eaves beam to form an inclined beam, and use steel sections to connect the top beam and the supporting beam to form a steel column;

[0009] S5. Seal the holes drilled through the parapet with mortar and perform waterproofing, and apply anti-rust and anti-corrosion paint to each steel beam;

[0010] S6. Lay a connecting beam square steel between the eaves beam and the supporting beam to form a connecting beam, and lay a sealing plate on the plane formed by the eaves beam, the supporting beam and the connecting beam, and fix it with bolts;

[0011] S7. Lay several connecting beams of square steel in the middle of the top beam and the eaves beam and weld them to the inclined beam. Lay decorative panels on the plane formed by the top beam, the eaves beam and the connecting beam and fix them with bolts.

[0012] The above-mentioned method of adding eaves to an existing building can make the added eaves, parapet and roof form a whole by fixing the cantilevered square steel on the building roof, and has a better ability to resist wind damage.

[0013] Furthermore, before executing step S1, the roof of the existing building is cleaned and items that may affect the construction are removed.

[0014] Furthermore, the portion of the cantilevered square steel outside the building accounts for one third of the square steel, and the portion of the square steel placed on the roof of the building accounts for two thirds of the square steel.

[0015] Furthermore, the drilling is performed in a horizontal direction.

[0016] Furthermore, the diameters of both ends of the drill hole passing through the parapet are larger than the diameter of the portion of the drill hole located in the parapet.

[0017] Furthermore, step S5 specifically includes firstly sealing the portion of the drill hole located in the parapet with mortar and then sealing both ends of the drill hole passing through the parapet with mortar.

[0018] Furthermore, the limited expansion rate of the mortar in water for two weeks is ≥0.4‰, and the limited shrinkage rate in air for four weeks is ≤0.25‰.

[0019] Furthermore, the decorative plate is one of a resin tile, a PVC plate or an aluminum plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a flow chart of a method for adding eaves to an existing building as described in an embodiment of the present application. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with its embodiments. It should be understood that the specific implementation methods described herein are only used to explain the present invention and do not limit the protection scope of the present invention.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0023] A method for adding eaves to an existing building in one embodiment of the present invention includes the following construction steps:

[0024] S1. Drill a hole at the bottom of the roof parapet and insert a cantilevered square steel into the hole, wherein one end of the cantilevered square steel is cantilevered outside the building and the other end is placed on the roof of the building;

[0025] S2. At the other end of the cantilevered square steel of the building roof, a template is laid and steel bars are welded to form an anchor beam, so that the cantilevered square steel is embedded in the anchor beam and connected to the steel bar, and then concrete is poured in the template to form a weight on the cantilevered square steel;

[0026] S3. Lay a continuous top beam square steel on the top of the parapet to form a top beam, and fix it to the parapet with bolts; lay a continuous eaves beam square steel on the outside of one end of the cantilevered cantilevered square steel to form an eaves beam, and weld it to fix it; lay a continuous supporting beam square steel at the junction of the parapet facade and the cantilevered square steel to form a supporting beam, and weld it to fix it;

[0027] S4. At each cantilevered square steel, use steel sections to connect the top beam and the eaves beam to form an inclined beam, and use steel sections to connect the top beam and the supporting beam to form a steel column;

[0028] S5. Seal the holes drilled through the parapet with mortar and perform waterproofing, and apply anti-rust and anti-corrosion paint to each steel beam;

[0029] S6. Lay a connecting beam square steel between the eaves beam and the supporting beam to form a connecting beam, and lay a sealing plate on the plane formed by the eaves beam, the supporting beam and the connecting beam, and fix it with bolts;

[0030] S7. Lay several connecting beams of square steel in the middle of the top beam and the eaves beam and weld them to the inclined beam. Lay decorative panels on the plane formed by the top beam, the eaves beam and the connecting beam and fix them with bolts.

[0031] The above-mentioned method of adding eaves to an existing building can make the added eaves, parapet and roof form a whole by fixing the cantilevered square steel on the building roof, and has a better ability to resist wind damage.

[0032] Specifically, the existing building targeted by the present application has a roof with a parapet, thereby ensuring completion of the construction.

[0033] In one embodiment, before executing step S1, the roof of the existing building is cleaned and objects that may affect the construction are removed.

[0034] In one of the embodiments, the portion of the cantilevered square steel outside the building accounts for one third of the square steel, and the portion of the square steel placed on the roof of the building accounts for two thirds of the square steel.

[0035] In one embodiment, the drilling is performed in a horizontal direction.

[0036] In one embodiment, the diameters of both ends of the borehole passing through the parapet are larger than the diameter of the portion of the borehole located in the parapet.

[0037] In one of the embodiments, step S2 specifically comprises laying a formwork and welding steel bars at the other end of the cantilevered square steel of the building roof, implanting the welded steel bars into the building roof, and at the same time, the lowest point of the casting space formed by the formwork is 0.05m-0.1m lower than the upper surface of the building roof, forming an anchor beam, embedding the cantilevered square steel into the anchor beam and connecting it to the steel bars, and then pouring concrete in the formwork to form a weight on the cantilevered square steel.

[0038] Specifically, a plurality of steel meshes are laid at equal intervals in the vertical direction in the template, and the welded steel bars are inserted into the meshes of the steel meshes at intervals. Through the above arrangement, the stability and reliability of the weight can be effectively improved, and the strength of the overall structure can be improved.

[0039] The pressure weight setting satisfies:

[0040]

[0041] Among them, K c is the safety factor, which is selected according to the provisions of the "Building Seismic Appraisal Standard" (GB50023-2009);

[0042] Q is the horizontal seismic shear force of the building roof;

[0043] F is the pressure of the weight;

[0044] ξ is the non-uniformity coefficient, which is mainly determined by the mass of concrete, the water content of concrete, the number of wire meshes, the number of meshes of the wire meshes and the strength of the wire meshes. Its value range can be obtained based on a limited number of experiments and will not be repeated here.

[0045] In one of the embodiments, step S3 specifically comprises: laying a continuous top beam square steel on the top of the parapet to form a top beam, and fixing it to the parapet with bolts; laying a continuous eaves beam square steel on the outside of one end of the cantilevered cantilevered square steel to form an eaves beam, and welding and fixing the outside of one end of the cantilevered cantilevered square steel to the continuous eaves beam square steel laid on one end of the cantilevered square steel; laying a continuous supporting beam square steel at the junction of the parapet facade and the cantilevered square steel to form a supporting beam, and welding and fixing the continuous supporting beam square steel laid at the junction of the parapet facade and the cantilevered square steel to the cantilevered square steel.

[0046] Specifically, the welding fixation method is as follows: a first chromium powder layer is laid on the welding surface of the welding position, a chromium sheet is laid on the first chromium powder layer, a second chromium powder layer is laid on the chromium sheet, the second chromium powder layer is in contact with the welding surface, and finally welding is performed using MG600 welding wire / electrode, and smooth grinding is performed after welding is completed; the laying thickness of the chromium powder layer is controlled to be 0.1 to 0.4 mm; the thickness of the chromium sheet is 0.6 to 1.6 mm.

[0047] In one embodiment, step S5 specifically includes first performing mortar plugging on the portion of the drill hole located in the parapet and then performing mortar plugging on both ends of the drill hole passing through the parapet. With this design, the cantilevered square steel can be fixed first and then plugged, which can improve the stability of the cantilevered square steel and facilitate subsequent waterproofing.

[0048] In one embodiment, the limited expansion rate of the mortar in water for two weeks is ≥0.4‰, and the limited shrinkage rate in air for four weeks is ≤0.25‰.

[0049] In one embodiment, the waterproofing process in step S5 specifically includes the following steps:

[0050] (1) When there is no water leakage in the hole, it can be directly filled with high-strength cement mortar. The cement strength grade should be 42.5 or above. Medium sand should be used. It should be sieved before use to prevent large pieces of debris from mixing in. The water-cement ratio of the mortar should be controlled at 0.38-0.45, so that the mortar can be held in a ball and will not fall apart when it is released. It is best to add 25% of the cement amount of alum stone expansion agent to the mortar to improve the bonding strength between the mortar and the hole, improve the pull-out resistance of the cantilevered square steel, and also improve the impermeability of the hole.

[0051] (2) When there is water leakage in the hole, grouting should be performed first to seal the water. It is best to choose a grout with low viscosity and low strength, because the grout can be injected into small cracks to block the water leakage in the hole, and it is also helpful to remove the residual grout in the hole after the grouting is completed and fill it with cement slurry.

[0052] In one embodiment, the decorative panel is one of a resin tile, a PVC panel or an aluminum panel.

[0053] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for adding eaves to an existing building, characterized in that: The construction steps include: S1. Drill a hole at the bottom of the roof parapet and insert a cantilevered square steel into the hole, wherein one end of the cantilevered square steel is cantilevered outside the building and the other end is placed on the roof of the building; S2. At the other end of the cantilevered square steel of the building roof, a template and welded steel bars are laid, and the welded steel bars are implanted into the building roof. At the same time, the lowest point of the casting space formed by the template is 0.05m-0.1m lower than the upper surface of the building roof, forming an anchor beam, so that the cantilevered square steel is embedded in the anchor beam and connected to the steel bars, and then concrete is poured in the template to form a weight on the cantilevered square steel; Among them, a plurality of steel meshes are laid at equal intervals in the vertical direction in the template, and the welded steel bars are inserted into the meshes of the steel meshes at intervals, which can effectively improve the stability and reliability of the weight and improve the strength of the overall structure; The pressure weight setting satisfies: Among them, K c is the safety factor, which is selected according to the provisions of the "Building Seismic Appraisal Standard" (GB50023-2009); Q is the horizontal seismic shear force of the building roof; F is the pressure of the weight; ξ is the non-uniformity coefficient; S3. Lay a continuous top beam square steel on the top of the parapet to form a top beam, and fix it to the parapet with bolts; lay a continuous eaves beam square steel on the outside of one end of the cantilevered cantilevered square steel to form an eaves beam, and weld it to fix it; lay a continuous supporting beam square steel at the junction of the parapet facade and the cantilevered square steel to form a supporting beam, and weld it to fix it; S4. At each cantilevered square steel, the top beam and the eaves beam are connected with profiled steel to form an inclined beam, and the top beam and the supporting beam are connected with profiled steel to form a steel column. The portion of the cantilevered square steel outside the building accounts for one third of the square steel, and the portion of the square steel placed on the roof of the building accounts for two thirds of the square steel; S5. The drilled holes passing through the parapet are sealed with mortar and waterproofed. Anti-rust and anti-corrosion paint is applied to each steel beam. The drilled holes in the parapet are sealed with mortar first, and then both ends of the drilled holes passing through the parapet are sealed with mortar. The limited expansion rate of the mortar in water for two weeks is ≥0.4‰, and the limited shrinkage rate in air for four weeks is ≤0.25‰; S6. Lay a connecting beam square steel between the eaves beam and the supporting beam to form a connecting beam, and lay a sealing plate on the plane formed by the eaves beam, the supporting beam and the connecting beam, and fix it with bolts; S7. Lay several connecting beams of square steel in the middle of the top beam and the eaves beam and weld them to the inclined beam. Lay decorative panels on the plane formed by the top beam, the eaves beam and the connecting beam and fix them with bolts.

2. The method for adding eaves to an existing building according to claim 1, characterized in that: Before executing step S1, the roof of the existing building is cleaned and objects that may affect the construction are removed.

3. The method for adding eaves to an existing building according to claim 1, characterized in that: The drilling is performed in a horizontal direction.

4. The method for adding eaves to an existing building according to claim 3, characterized in that: The diameters of both ends of the drill hole passing through the parapet are larger than the diameter of the portion of the drill hole located in the parapet.

5. The method for adding eaves to an existing building according to claim 1, characterized in that: The decorative plate is one of a resin tile, a PVC plate or an aluminum plate.

Images