Formwork erecting method for steel funnel top concrete structure

Abstract

The application discloses a formwork erecting method for a steel funnel top concrete structure, which comprises the following steps: determining a plurality of supporting base mounting positions on a steel funnel sidewall; manufacturing supporting bases and welding and fixing the supporting bases to the steel funnel sidewall; mounting first direction horizontal steel pipes on the supporting bases to form a lower supporting layer in a steel funnel top area; erecting a supporting frame on the lower supporting layer; arranging horizontal scissors supports on the top and bottom of the supporting frame and mounting a top support on the top of the vertical rod; mounting a long back, a short back and a formwork on the top support in sequence, so that the formwork is located below a pouring position of the steel funnel top concrete structure; and after the supporting frame and the formwork are accepted, reinforcing steel bars are bound and concrete is poured. The application solves the problems of large erecting height of a scaffold, large quantity of temporary supporting pieces welded in the steel funnel and large workload of dismantling and polishing in the formwork erecting construction of the existing steel funnel top concrete structure.

Description

Technical Field

[0001] This invention relates to the field of industrial building technology engineering, and more specifically, to a method for supporting the formwork of a concrete structure at the top of a steel funnel. Background Technology

[0002] In industrial buildings such as metallurgical plants, mines, and raw material yards, steel funnels are commonly used for material storage, diversion, or batching. Steel funnels are typically installed in the upper middle part of a concrete frame structure, above which concrete beams, slabs, or platform structures need to be constructed. Because the steel funnel occupies lower space, the formwork support construction of the concrete structure above the funnel is limited by the shape of the funnel, the location of the opening, and the available construction space.

[0003] Current construction methods typically begin with erecting scaffolding from the ground or a lower concrete platform, then extending the scaffolding through the bottom of a steel funnel or into its interior before continuing upwards to the top concrete structure. For the scaffolding uprights located inside the steel funnel, it is often necessary to weld a large number of short vertical reinforcing bars or temporary supports inside the funnel, according to the longitudinal and transverse spacing of the uprights, to support or position the scaffolding uprights.

[0004] The above-mentioned methods have at least the following problems: First, the scaffolding erection height is large, resulting in a large workload for erection and dismantling, and a long construction period; second, a large number of short steel bars or temporary supports need to be welded inside the steel funnel, leading to a large workload for subsequent cutting, grinding, and anti-corrosion treatment; third, welding and cutting operations easily increase damage to the surface of the steel funnel; fourth, the support frame passes through the inside of the steel funnel, restricting the working space and complicating the construction organization. Therefore, there is an urgent need for a formwork method suitable for the concrete structure at the top of the steel funnel, in order to reduce the amount of scaffolding erection starting from the ground and reduce the workload of temporary welding and post-treatment inside the steel funnel. Summary of the Invention

[0005] To address the problems existing in the prior art, the present invention aims to provide a formwork support method for the concrete structure at the top of a steel funnel, thereby solving the problems of large scaffolding height, numerous temporary welded supports inside the steel funnel, and large workload for dismantling and grinding in the existing formwork support construction of the concrete structure at the top of the steel funnel.

[0006] The present invention adopts the following technical solution:

[0007] This invention discloses a method for supporting the formwork of a concrete structure at the top of a steel funnel, comprising the following steps:

[0008] S1. Based on the location of the top concrete structure of the steel funnel to be poured, the outline of the steel funnel sidewall, and the formwork support load, determine the installation positions of multiple support bases on the sidewall of the steel funnel.

[0009] S2. Fabricate multiple support bases and weld and fix the support bases to the side wall of the steel funnel. The support bases have a support portion extending toward the inside of the steel funnel.

[0010] S3. Install a first-direction horizontal steel pipe on the support base, so that the end of the first-direction horizontal steel pipe is supported on the support part, and a lower support layer is formed by multiple first-direction horizontal steel pipes in the top area of ​​the steel funnel.

[0011] S4. A support frame is erected on the lower support layer. The support frame includes uprights, horizontal bars and diagonal bars. The lower end of the uprights is supported on the lower support layer. The horizontal bars connect adjacent uprights. The diagonal bars connect the uprights and / or horizontal bars.

[0012] S5. Horizontal scissor braces are provided at the top and bottom of the support frame, and a top support is installed at the top of the upright.

[0013] S6. Install the long back side, the short back side and the template in sequence on the top support, so that the template is located below the position to be poured in the concrete structure at the top of the steel funnel.

[0014] S7. After inspecting the support frame and formwork, proceed with rebar tying and concrete pouring;

[0015] The support frame is not erected from the ground, but is supported by a base welded to the side wall of the steel funnel and a first-direction horizontal steel pipe supported on the base, so that the erection height of the support frame is limited to the top area of ​​the steel funnel.

[0016] Furthermore, in step S1, multiple support bases are installed in pairs along the opposite side walls of the steel funnel, and the supporting parts of the same pair of support bases are at the same height, so that the two ends of the horizontal steel pipe in the first direction are respectively supported on the two paired support bases.

[0017] Furthermore, the support base includes a support plate and stiffening ribs. The support plate is welded and fixed to the side wall of the steel funnel. The support plate extends toward the inside of the steel funnel. The stiffening ribs connect the side wall of the steel funnel and the support plate.

[0018] Furthermore, a limiting portion is formed on the support plate to restrict the rolling or lateral movement of the first horizontal steel pipe, the first horizontal steel pipe being placed in the limiting portion or abutting against the limiting portion.

[0019] Furthermore, after step S3, the method further includes the step of installing a second horizontal steel pipe on the first horizontal steel pipe, wherein the second horizontal steel pipe intersects with the first horizontal steel pipe and is connected by fasteners to form a grid-like lower support layer.

[0020] Furthermore, in step S4, the uprights, horizontal bars, and diagonal bars are all made of steel pipes with a diameter of 48mm. Adjacent uprights are connected by horizontal bars to form frame units, and adjacent frame units are connected by diagonal bars to form a spatially stable structure.

[0021] Furthermore, in step S6, the long back side is a steel pipe back side arranged along the long direction of the concrete structure, the short back side is a wooden back side arranged along the short direction of the concrete structure, and the template is a wooden template with a thickness of 15mm.

[0022] Furthermore, after the concrete strength reaches the demolding requirements, the formwork system is dismantled in the following order: formwork, short back side, long back side, top support, horizontal scissor brace, diagonal brace, horizontal bar, vertical bar, and lower support layer. The welded parts between the support base and the side wall of the steel funnel are retained, treated with anti-corrosion measures, or cut off and ground.

[0023] Furthermore, the height of the support frame is 3m to 4m, the support base is set on the inner side wall of the steel funnel, and the load of the support frame is transferred to the side wall of the steel funnel through the lower support layer and the support base.

[0024] Beneficial effects

[0025] This invention utilizes the side wall of the steel funnel as a support reaction point, and forms a local support foundation for the top of the steel funnel through the support base and the lower support layer, eliminating the need to start from the ground or lower platform to erect a full-span scaffold, thus significantly reducing the height of the support frame.

[0026] The present invention only requires setting a support base at a selected position on the side wall of the steel funnel, which reduces the amount of welding, cutting and grinding work required for a large number of short steel bars or temporary supports inside the steel funnel.

[0027] The support frame of this invention is located at the top of the steel funnel, with a low erection height, and the operating space for construction personnel is relatively concentrated, which is conducive to improving the efficiency of formwork and the quality of installation.

[0028] A spatial support system is formed by horizontal steel pipes in the first direction, horizontal steel pipes in the second direction, vertical poles, horizontal poles, diagonal poles, and horizontal scissor braces, which can meet the load-bearing and stability requirements of the concrete beam and slab formwork at the top of the steel funnel.

[0029] Reducing the number of welding operations on the surface of the steel funnel and minimizing subsequent repair, corrosion protection, and grinding work will help shorten the construction period and reduce construction costs. Attached Figure Description

[0030] Figure 1 This is a cross-sectional view of an embodiment of the present invention after formwork support;

[0031] Figure 2 This is a plan view of an embodiment of the present invention after formwork support;

[0032] Figure 3 This is a schematic diagram of the lateral node connecting the support base and the steel funnel according to an embodiment of the present invention;

[0033] Figure 4 This is a schematic diagram of the planar node connecting the support base and the steel funnel according to an embodiment of the present invention. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0035] As shown in the figure, this embodiment provides a formwork method for the concrete structure at the top of a steel funnel, applicable to scenarios where the steel funnel 1 is installed in a concrete frame structure and a concrete beam, slab, or platform structure needs to be constructed at the top of the steel funnel. The concrete structure at the top of the steel funnel 1 is to be constructed. If scaffolding is erected starting from the ground, a relatively high scaffolding structure is required, and a large number of temporary supports need to be installed inside the steel funnel 1. This embodiment forms a local support foundation in the top area of ​​the steel funnel by setting a support base 3 on the side wall 2 of the steel funnel.

[0036] First, based on the location of the concrete structure at the top of the steel funnel, the beam and slab outline, the formwork load, the construction load, and the shape of the side wall 2 of the steel funnel, measurements are taken and lines are laid out on the side wall 2 of the steel funnel to determine the installation positions of multiple support bases 3. The multiple support bases 3 are preferably arranged in pairs along the opposite side walls of the steel funnel 1, with the same pair of support bases 3 at the same elevation, to facilitate the subsequent installation of the first-direction horizontal steel pipe 4. In a specific project, 10 support bases 3 can be selected according to the planar layout of the support frame.

[0037] The support base 3 includes a support plate 31 and stiffening ribs 32. The support plate 31 is welded and fixed to the side wall 2 of the steel funnel 1, and extends into the steel funnel 1. The stiffening ribs 32 connect the side wall 2 of the steel funnel 1 and the support plate 31 to improve the bending and shear resistance of the support plate 32. A limiting part may be provided on the support plate 31, which may be a flange, a limiting groove, or a limiting block, to limit the rolling or lateral displacement of the horizontal steel pipe 4 in the first direction.

[0038] After the support base 3 is fabricated, it is welded and fixed to the side wall 2 of the steel funnel according to the marked position. Before welding, the welding area of ​​the side wall 2 of the steel funnel can be cleaned. After welding, the weld quality and the elevation of the support surface are checked to ensure that the support bases 3 at both ends of the same horizontal steel pipe 4 in the first direction meet the installation requirements of the same elevation.

[0039] Subsequently, a first-direction horizontal steel pipe 4 is installed on the support base 3. Both ends of the first-direction horizontal steel pipe 4 are supported on the support plates 31 of two oppositely arranged support bases 3, and can be positioned and connected to the support bases 3 via fasteners, clamps, limiting devices, or binding devices. After multiple first-direction horizontal steel pipes 4 are arranged at intervals, a lower support layer is formed in the top area of ​​the steel funnel. According to the stability requirements of the support frame, a second-direction horizontal steel pipe 5 can also be installed on the first-direction horizontal steel pipe 4. The second-direction horizontal steel pipe 5 intersects with the first-direction horizontal steel pipe 4 and is connected by fasteners to form a grid-like lower support layer.

[0040] After the lower support layer is formed, a support frame is erected on it. The support frame includes uprights 6, horizontal bars 7, and diagonal bars 8. The lower ends of the uprights 6 are supported by the lower support layer, the horizontal bars 7 connect adjacent uprights 6, and the diagonal bars 8 connect uprights 6 and / or horizontal bars 7. The uprights 6, horizontal bars 7, and diagonal bars 8 can all be made of steel pipes with a diameter of 48mm. The combination of uprights 6, horizontal bars 7, and diagonal bars 8 forms a spatially stable frame for supporting the upper formwork system.

[0041] To improve the overall stability of the support frame, horizontal scissor braces 9 are installed at the support frame. The horizontal scissor braces 9 can be intersected along the horizontal plane of the support frame and connected to the uprights 6 or horizontal bars 7. The horizontal scissor braces 9 can limit the horizontal deformation of the support frame and improve the overall stability of the support frame during concrete pouring.

[0042] A top support 10 is installed at the top of the upright 6, and the elevation of the formwork is controlled by adjusting the height of the top support 10. A longitudinal back support 11 is installed on the top support 10; preferably, the longitudinal back support 11 is a steel pipe back support arranged along the length of the concrete structure. A short back support 12 is installed on the longitudinal back support 11; preferably, the short back support 12 is a wooden back support arranged along the short direction of the concrete structure. Formwork 13 is installed on the short back support 12; formwork 13 can be made of 15mm thick wooden formwork. After the formwork 13 is installed, the elevation, flatness, and stability of the support frame are checked. After acceptance, the reinforcing steel is tied and the concrete is poured.

[0043] After the concrete reaches the required strength for demolding, remove the formwork 13, short back support 12, long back support 11, top support 10, horizontal scissor brace 9, diagonal brace 8, horizontal bar 7, vertical bar 6, and lower support layer in the order from top to bottom. The support base 3 can be retained and treated with anti-corrosion measures according to project requirements, or it can be cut off and the steel funnel sidewall 2 can be ground and repaired with anti-corrosion measures.

[0044] Taking the mixing and batching room in the raw material yard of a steel company's relocation project as an example, this project is a concrete frame structure with multiple platforms. The steel funnel is installed near the second floor, and the top concrete platform is located at the upper level. Using the traditional method, scaffolding needs to be erected from the ground or lower platform to the top concrete platform of the steel funnel, and multiple short steel bars need to be welded inside the steel funnel to support the scaffolding uprights. This results in a large erection height and a long construction period. Using the method of this embodiment, a support base 3 is set on the inner wall of the steel funnel, with the lower support layer serving as the bottom foundation of the support frame. This allows the erection height of the support frame 15 to be controlled within a local height range in the top area of ​​the steel funnel, for example, 3m to 4m, thereby reducing the amount of scaffolding erection work and the amount of temporary welding, cutting, and grinding work inside the steel funnel.

[0045] The key to this invention lies not in using steel pipe scaffolding, top supports, or wooden formwork alone, but in welding the support base 3 to the side wall 2 of the steel funnel, and using the support base 3 and horizontal steel pipes to form a partial support foundation for the top of the steel funnel. This allows the support frame to be erected directly in the top area of ​​the steel funnel, instead of starting from the ground or a lower platform. This force path and construction sequence can effectively adapt to construction scenarios where the steel funnel occupies the lower space and it is not convenient to erect formwork support frames from the ground.

[0046] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. A method for supporting the formwork of a concrete structure at the top of a steel funnel, characterized in that: Includes the following steps: S1. Based on the location of the top concrete structure of the steel funnel to be poured, the outline of the steel funnel sidewall, and the formwork support load, determine the installation positions of multiple support bases on the sidewall of the steel funnel. S2. Fabricate multiple support bases and weld and fix the support bases to the side wall of the steel funnel. The support bases have a support portion extending toward the inside of the steel funnel. S3. Install a first-direction horizontal steel pipe on the support base, so that the end of the first-direction horizontal steel pipe is supported on the support part, and a lower support layer is formed by multiple first-direction horizontal steel pipes in the top area of ​​the steel funnel. S4. A support frame is erected on the lower support layer. The support frame includes uprights, horizontal bars and diagonal bars. The lower end of the uprights is supported on the lower support layer. The horizontal bars connect adjacent uprights. The diagonal bars connect the uprights and / or horizontal bars. S5. Horizontal scissor braces are provided at the top and bottom of the support frame, and a top support is installed at the top of the upright. S6. Install the long back side, the short back side and the template in sequence on the top support, so that the template is located below the position to be poured in the concrete structure at the top of the steel funnel. S7. After inspecting the support frame and formwork, proceed with rebar tying and concrete pouring; The support frame is not erected from the ground, but is supported by a base welded to the side wall of the steel funnel and a first-direction horizontal steel pipe supported on the base, so that the erection height of the support frame is limited to the top area of ​​the steel funnel.

2. The formwork support method for the top concrete structure of a steel funnel according to claim 1, characterized in that: In step S1, multiple support bases are installed in pairs along the opposite side walls of the steel funnel, and the supporting parts of the same pair of support bases are at the same height, so that the two ends of the horizontal steel pipe in the first direction are respectively supported on the two paired support bases.

3. The formwork support method for the top concrete structure of a steel funnel according to claim 1, characterized in that: The support base includes a support plate and stiffening ribs. The support plate is welded and fixed to the side wall of the steel funnel and extends toward the inside of the steel funnel. The stiffening ribs connect the side wall of the steel funnel and the support plate.

4. The formwork support method for the top concrete structure of a steel funnel according to claim 3, characterized in that: The support plate has a limiting part for restricting the rolling or lateral movement of the first horizontal steel pipe, which is placed in the limiting part or abuts against the limiting part.

5. The formwork support method for the top concrete structure of a steel funnel according to claim 1, characterized in that: Following step S3, the method further includes installing a second horizontal steel pipe on the first horizontal steel pipe, wherein the second horizontal steel pipe intersects with the first horizontal steel pipe and is connected by fasteners to form a grid-like lower support layer.

6. The formwork support method for the top concrete structure of a steel funnel according to claim 1, characterized in that: In step S4, the uprights, horizontal bars, and diagonal bars are all made of steel pipes with a diameter of 48mm. Adjacent uprights are connected by horizontal bars to form frame units, and adjacent frame units are connected by diagonal bars to form a spatially stable structure.

7. The formwork support method for the top concrete structure of a steel funnel according to claim 1, characterized in that: In step S6, the long back side is a steel pipe back side arranged along the long direction of the concrete structure, the short back side is a wooden back side arranged along the short direction of the concrete structure, and the template is a wooden template with a thickness of 15mm.

8. The formwork support method for the top concrete structure of a steel funnel according to claim 1, characterized in that: After the concrete strength reaches the demolding requirements, the formwork system is dismantled in the following order: formwork, short back side, long back side, top support, horizontal scissor brace, diagonal brace, horizontal bar, vertical bar, and lower support layer. The welded parts between the support base and the side wall of the steel funnel are preserved, treated with anti-corrosion measures, or cut off and ground.

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