A prefabricating device for a concrete column reinforcement cage and a construction process

Abstract

A concrete column steel reinforcement framework prefabrication forming device and construction process, which is provided with a lower concrete column main reinforcement, a current concrete column main reinforcement, a concrete column stirrup, a column top constraint and limiting ring, and a column bottom constraint and limiting ring; the column top constraint and limiting ring comprises an upper ring body, an upper main reinforcement sleeve ring and an upper supporting leg; the upper ring body is provided with the upper main reinforcement sleeve ring at an inner corner, and the current concrete column main reinforcement is inserted into the upper main reinforcement sleeve ring and can be adjusted by being twisted and moved up and down. The upper supporting leg is connected with the upper ring body to play a role of temporary positioning and alignment, the column bottom constraint and limiting ring has the same structure as the column top constraint and limiting ring, the lower supporting leg of the column bottom constraint and limiting ring is opposite to the upper supporting leg to determine the layer height. The column top constraint and limiting ring, the column constraint and limiting ring and the column bottom constraint and limiting ring are connected through a limiting ring connecting plate to form a framework. Through the above structure, the steel reinforcement system of the concrete column is changed from being spliced on the construction site to being assembled in the factory, the production efficiency and the construction quality are improved, and the construction period is shortened.

Description

TECHNICAL FIELD

[0001] The present application relates to a concrete column steel reinforcement framework prefabrication forming device and construction process, in particular to the technical field of industrialized production and installation of building concrete columns, and particularly relates to a concrete column steel reinforcement framework prefabrication forming device and construction process. BACKGROUND

[0002] A concrete column is composed of column stress main reinforcement, stirrup and concrete. After the main reinforcement and steel reinforcement are bound, a formwork is needed to constrain and then concrete is poured to form. The concrete column is a vertical load-bearing component of a building, which is generally combined with a concrete beam and a concrete slab to form a frame structure of a house. The steel reinforcement of the concrete beam and slab must be anchored and connected to the concrete column to form a frame stress structure. This building forming method is commonly called a concrete cast-in-place structure.

[0003] With the further development of concrete construction technology, the pace of building industrialization is increasing year by year, and in particular, prefabricated buildings have been widely applied since this year. A large number of concrete columns are prefabricated in factories to save labor, improve quality and reduce costs. According to the type, it is usually divided into prefabricated solid concrete columns and prefabricated hollow concrete columns.

[0004] Technical defects of existing concrete column structure and process:

[0005] 1. Traditional cast-in-place concrete column: the steel reinforcement framework of the main reinforcement and stirrup is cut and formed at the construction site, which occupies a large area of processing site and cannot be mass-produced mechanically. It is time-consuming and labor-intensive, and the overall project cost increases significantly with the increasing labor cost.

[0006] 2. Prefabricated solid concrete column: a large number of molds are needed, and the steel reinforcement joint adopts a "sleeve grouting" connection technology, which is high in cost and difficult to control in quality. The finished product is heavy and difficult to transport and hoist.

[0007] 3. Prefabricated hollow concrete column: the column main reinforcement joint is extremely difficult to connect, and if the lap joint method is used, the cost is high and the lap joint quality is difficult to control. SUMMARY

[0008] The purpose of the present application is to overcome the shortcomings of the existing structure and process, provide a concrete column steel reinforcement framework prefabrication forming device and construction process, and solve the technical problems of high cost, poor lap joint quality and difficulty in transporting finished products in the prior art.

[0009] To solve the above technical problems, the technical scheme of the present application is: a concrete column steel reinforcement framework prefabricated forming device is provided with a lower concrete column main reinforcement, a current concrete column main reinforcement and a concrete column stirrup, characterized in that: it comprises a column top constraint and limiting ring and a column bottom constraint and limiting ring; the column top constraint and limiting ring comprises an upper ring body, an upper main reinforcement sleeve ring and an upper leg; the upper ring body is parallel to the concrete column stirrup; the upper main reinforcement sleeve ring is arranged at an inner corner of the upper ring body, and the current concrete column main reinforcement is inserted into the upper main reinforcement sleeve ring; the upper leg is arranged along the length direction of the column body and connected with the upper ring body.

[0010] The column bottom constraint and limiting ring has the same structure as the column top constraint and limiting ring, and the lower leg of the column bottom constraint and limiting ring is opposite to the upper leg; the column bottom constraint and limiting ring comprises a bottom ring body, a bottom main reinforcement sleeve ring and a lower leg; the bottom ring body is parallel to the concrete column stirrup; the bottom main reinforcement sleeve ring is arranged at an inner corner of the bottom ring body, and the lower concrete column main reinforcement is inserted into the bottom main reinforcement sleeve ring; the lower leg is arranged along the length direction of the column body and connected with the bottom ring body.

[0011] The column top constraint and limiting ring and the column bottom constraint and limiting ring are provided with a column interval constraint and limiting ring; the column interval constraint and limiting ring comprises an intermediate ring body and an intermediate main reinforcement sleeve ring arranged at an inner corner of the ring body, and the current concrete column main reinforcement is inserted into the intermediate main reinforcement sleeve ring.

[0012] The column top constraint and limiting ring, the column bottom constraint and limiting ring and the column interval constraint and limiting ring are connected by a limiting ring connecting plate, and the limiting ring connecting plate is arranged along the length direction of the concrete column.

[0013] A method for prefabricating the concrete column steel reinforcement framework prefabricated forming device is provided, and the steps are as follows:

[0014] 1) According to the specifications and quantities of the concrete steel reinforcement, the column top constraint and limiting ring, the column interval constraint and limiting ring, the bottom constraint and limiting ring and the limiting ring connecting plate are prepared;

[0015] 2) The column main reinforcement and the stirrup are cut and prepared for use: the traditional process is performed according to the design requirements;

[0016] 3) The limiting rings are connected in series to form a framework: the column top constraint and limiting ring, the bottom constraint and limiting ring and the column interval constraint and limiting ring are welded into one body by the limiting ring connecting plate according to the design positioning requirements;

[0017] 4) The current concrete column main reinforcement: according to the design requirements, the current concrete column main reinforcement is respectively inserted into the corresponding main reinforcement sleeve ring and temporarily fixed to prevent falling during transportation and installation;

[0018] 5) The concrete column stirrup is inserted: the concrete column stirrup is only fixed with the limiting ring connecting plate, and the process is completed.

[0019] The method for full-site pouring construction by using the prefabricated forming device of the concrete column steel framework is as follows:

[0020] 1) In the factory, the top restraint and limiting ring, the column-to-column restraint and limiting ring, the column bottom restraint and limiting ring, and the limiting ring connecting plate are prefabricated and connected to form a main framework.

[0021] 2) The main reinforcement of the concrete column is inserted into the respective main reinforcement sleeve and temporarily fixed to prevent falling during transportation and hoisting;

[0022] 3) The stirrup is bound or welded on the main framework according to the design requirements;

[0023] 4) The main reinforcement, stirrup, limiting ring, and connecting plate form a complete steel framework, and the steel framework is directly transported to the site;

[0024] 5) On-site steel connection is performed, and the reserved main reinforcement of the lower concrete column is inserted into the main reinforcement sleeve corresponding to the column bottom restraint and limiting ring of the column body;

[0025] 6) Because the lower column has been poured with concrete, the main reinforcement cannot be moved, and the main reinforcement of the bottom column inserted into the sleeve is fixed, so the main reinforcement in the sleeve of the current column is adjusted by adjusting the position and rotating the threaded sleeve, and the connection is completed;

[0026] 7) The formwork is erected;

[0027] 8) Concrete pouring, curing, and molding;

[0028] 9) The formwork is removed at the required time;

[0029] 10) Completion.

[0030] The factory-molded hollow column with removable formwork comprising the prefabricated forming device of the concrete column steel framework, wherein the outer part of the prefabricated forming device of the concrete column steel framework is provided with a removable formwork; a steel reinforcement layer spacer is arranged between the removable formwork and the column top restraint and limiting ring or the column-to-column restraint and limiting ring or the column bottom restraint and limiting ring; and a self-tapping screw passes through the removable formwork and the column top restraint and limiting ring or the column-to-column restraint and limiting ring or the column bottom restraint and limiting ring for positioning.

[0031] A method for construction by using the factory-molded hollow column with removable formwork is as follows:

[0032] 1) Removable formwork preparation: the removable formwork is a cement-based material compatible with concrete;

[0033] 2) The removable formwork is cut according to the size of the column body;

[0034] 3) Steel reinforcement layer spacers are placed outside the steel framework according to design requirements;

[0035] 4) with self-tapping screw to fix the removable formwork on the steel reinforcement framework, and the steel reinforcement joint position is not fixed first, and the operation opening is reserved;

[0036] 5) the prefabricated hollow column is transported to the construction site;

[0037] 6) hoisting and positioning: at this time, the reserved main reinforcement of the next layer is accurately inserted into the bottom main reinforcement sleeve ring of the column bottom constraint and limiting ring; the lower leg contacts the structural layer of the lower layer and forms a temporary stable structure;

[0038] 8) column adjustment and temporary support setting, Party B misplacement: traditional process method;

[0039] 9) main reinforcement lap joint: since the main reinforcement of the column is in the sleeve ring and can move freely, threaded sleeve connection or welding can be used;

[0040] 10) after the joint is checked and no error is found, the hidden acceptance is carried out, the operation opening is blocked with the removable formwork, and the self-tapping screw is locked;

[0041] 11) concrete pouring, curing and molding.

[0042] The beneficial effects of the present application are:

[0043] 1. The steel reinforcement system of the concrete column is changed from on-site cutting and splicing to factory assembly and molding, which preliminarily realizes the goal and direction of building industrialization and meets the current national policy requirements;

[0044] 2. A large amount of auxiliary land area is saved on the construction site;

[0045] 3. Mechanized production is realized, and production efficiency is greatly improved;

[0046] 4. A large amount of labor cost is saved;

[0047] 4. The product quality is improved;

[0048] 6. The application mode is flexible, the removable formwork can be preassembled in the factory to form a preassembled hollow column, or the formwork can be laid on site;

[0049] 7. The building industrialization goal of energy saving, emission reduction and environmental protection is realized. BRIEF DESCRIPTION OF DRAWINGS

[0050] Figure 1 : Structure diagram of prefabricated molding device of concrete column steel reinforcement framework.

[0051] Figure 2 : Structure diagram of column top constraint and limiting ring;

[0052] Figure 3 : Structure diagram of column constraint and limiting ring;

[0053] Figure 4 : Column bottom constraint and limiting ring structure schematic diagram;

[0054] Figure 5 : Factory forming hollow column structure without disassembly of mold schematic diagram. DETAILED DESCRIPTION

[0055] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the application.

[0056] A concrete column steel reinforcement cage prefabrication forming device is provided with a lower concrete column main reinforcement 8, a current concrete column main reinforcement 1 and a concrete column stirrup 2, a column top constraint and limiting ring 3 and a column bottom constraint and limiting ring 5. The top constraint and limiting ring 3 and the column bottom constraint and limiting ring 5 are provided with a column constraint and limiting ring 4 therebetween.

[0057] The column top constraint and limiting ring 3 comprises an upper ring body 3-1, an upper main reinforcement sleeve ring 3-3 and an upper leg 3-2. The upper ring body 3-1 is parallel to the concrete column stirrup 2 and is a closed square structure welded by a metal plate, is arranged in parallel with the column stirrup and has a plate thickness not greater than a column stirrup diameter, so that the thickness of the ring body and the thickness of the upper main reinforcement sleeve ring 3-3 are equal to the diameter of the concrete column stirrup 2, so as to ensure the accurate stability of the column main reinforcement position. The upper ring body 3-1 is provided with the upper main reinforcement sleeve ring 3-3 at an inner corner, the current concrete column main reinforcement 1 is inserted into the upper main reinforcement sleeve ring 3-3, the main reinforcement sleeve ring is fixedly connected with the ring body, the sleeve ring has a diameter greater than the diameter of the main reinforcement to be passed through, and the core role is to constrain the column main reinforcement position, so that the main reinforcement and the main reinforcement joint 7 are accurately positioned in the plane, and the main reinforcement can freely move, that is, can be twisted and can be moved up and down. The upper leg 3-2 is arranged along the length direction of the column body and is connected with the upper ring body 3-1, the upper leg 3-2 is fixedly welded around the ring body, and the drawing of the application is four legs, which are arranged staggered with the main reinforcement sleeve ring and the limiting ring connecting plate 6. The length of the upper leg is determined by calculation, and the top elevation is not lower than the top surface elevation of the floor, so as to facilitate the accurate positioning of the upper column of the house and the column bottom constraint and limiting ring, that is, the lower leg of the column bottom constraint and limiting ring is positioned and pressed against the upper leg of the column top constraint and limiting ring, and the role is to temporarily position the steel reinforcement cage, so as to facilitate the subsequent steel reinforcement connection and other operations.

[0058] The column bottom restraint and limiting ring 5 has the same structure as the column top restraint and limiting ring 3. The column bottom restraint and limiting ring 5 comprises a bottom ring body 5-1, a bottom main reinforcement sleeve ring 5-3 and a lower supporting leg 5-2. The bottom ring body 5-1 is parallel to the concrete column stirrup 2. The bottom main reinforcement sleeve ring 5-3 is arranged at the inner corner of the bottom ring body 5-1, and the lower layer concrete column main reinforcement 8 is inserted into the bottom main reinforcement sleeve ring 5-3. The lower supporting leg 5-2 is arranged along the length direction of the column body and connected with the bottom ring body 5-1.

[0059] The column interval restraint and limiting ring 4 comprises an intermediate ring body 4-1 and an intermediate main reinforcement sleeve ring 4-3 arranged at the inner corner of the ring body 4-1. The intermediate main reinforcement sleeve ring 4-3 is inserted into the intermediate main reinforcement sleeve ring 4-3. According to the layer height, one or more column interval restraint and limiting rings 4 can be arranged between the top restraint and limiting ring 3 and the column bottom restraint and limiting ring 5. The intermediate ring body 4-1 has the same structure and function as the upper ring body 3-1, and the intermediate main reinforcement sleeve ring 4-3 has the same structure and function as the upper main reinforcement sleeve ring 3-3.

[0060] The top restraint and limiting ring 3, the column bottom restraint and limiting ring 5 and the column interval restraint and limiting ring 4 are connected by the limiting ring connecting plate 6 arranged along the length direction of the concrete column. The steel plate type high strength material is used to connect the top restraint and limiting ring 3, the column interval restraint and limiting ring 4 and the column bottom restraint and limiting ring 5 to form a skeleton, and fix the stirrup of the column.

[0061] The column main reinforcement joint position 7 is arranged between the lower layer concrete column main reinforcement 8 and the current layer concrete column main reinforcement 1. The accuracy of the joint plane position is determined by the top restraint and limiting ring 3 and the column bottom restraint and limiting ring 5, and the up-down position is determined by the design. The conventional connection methods are welding and sleeve connection. The steel reinforcement welding joint can be directly operated, and the sleeve connection needs to be adjusted to the position and then rotated to meet the technical standard requirements.

[0062] Lower layer concrete column main reinforcement 8: After the concrete is poured, the main reinforcement of the lower layer column naturally extends out of the top surface of the structure layer, and the extension length is determined by the design. When the current layer column reinforcement skeleton is installed, the main reinforcement of the lower layer column will accurately penetrate into the bottom main reinforcement sleeve ring 5-3 and be connected with the main reinforcement of the current layer column at the column main reinforcement joint position 7.

[0063] The main function of the upper and lower supporting legs is to determine the positioning elevation of the column, as shown by the middle positioning lines H and H+1. Figure 1

[0064] Embodiment:

[0065] 1. According to the specifications and quantities of the concrete steel reinforcement, the column top restraint and limiting ring 3, the column interval restraint and limiting ring 4, the bottom restraint and limiting ring 5 and the limiting ring connecting plate 6 are prepared.

[0066] ​2. Column main reinforcement and stirrup blanking standby: according to the design requirements, traditional process;

[0067] 3. Series limiting ring, forming the framework: according to the design positioning requirements, the column top constraint and limiting ring 3, the bottom constraint and limiting ring 5 and the column constraint and limiting ring 4 are welded into one by the limiting ring connecting plate 6;

[0068] 4. This layer of concrete column main reinforcement 1: according to the design requirements, the main reinforcement 1 of this layer of concrete column is respectively inserted into the corresponding main reinforcement sleeve and temporarily fixed to prevent falling during transportation and installation;

[0069] 5. Concrete column stirrup 2: the concrete column stirrup 2 is only fixed with the limiting ring connecting plate 6, and the work is completed.

[0070] Example 1:

[0071] Prefabricated factory forming hollow column without disassembly formwork: the outside of the concrete column steel reinforcement framework prefabricated forming device is provided with a disassembly formwork C; between the disassembly formwork C and the column top constraint and limiting ring 3 or the column constraint and limiting ring 4 or the column bottom constraint and limiting ring 5, a reinforcement protection layer pad B is arranged; a self-tapping screw A passes through the disassembly formwork C and the column top constraint and limiting ring 3 or the column constraint and limiting ring 4 or the column bottom constraint and limiting ring 5 to position.

[0072] Installation steps:

[0073] 1. Disassembly formwork preparation: the disassembly formwork is a cement-based material compatible with concrete;

[0074] 2. According to the size of the column, cut the disassembly formwork C;

[0075] 3. According to the design requirements, place the reinforcement protection layer pad B outside the reinforcement framework;

[0076] 4. Fix the disassembly formwork C on the reinforcement framework with self-tapping screws A, and the disassembly formwork is not fixed at the reinforcement joint position first, leaving an operation opening;

[0077] 5. Transport the prefabricated hollow column to the construction site;

[0078] 6. Hoisting and positioning: at this time, the reserved main reinforcement of the next layer will be accurately inserted into the bottom main reinforcement sleeve 5-3 of the column bottom constraint and limiting ring 5; the lower leg 5-2 contacts the structure layer of the lower layer, and forms a temporary stable structure;

[0079] 8. Column adjustment and temporary support setting, Party B misplacement: traditional process method;

[0080] 9, Main reinforcement lap: because the column of the main reinforcement is in the sleeve, it can move freely, so the "threaded sleeve" connection is adopted; welding is only up and down alignment, that is, the two steel bars are connected, while the threaded sleeve connection must be threaded after the steel bar end is threaded and rotated into the sleeve to complete the connection;

[0081] 10, After checking the joint, the hidden acceptance is carried out, and the operation port is blocked with the removable formwork C and locked with the self-tapping screw A;

[0082] 11, Concrete pouring, curing and molding.

[0083] Example 2:

[0084] Full cast-in-place scheme:

[0085] 1, In the factory, the top restraint and limiting ring 3, the column restraint and limiting ring 4, the column bottom restraint and limiting ring 5 and the limiting ring connecting plate 6 are preconnected to form the main framework.

[0086] 2, The main reinforcement 1 of the concrete column is inserted into the respective main reinforcement sleeve ring and temporarily fixed to prevent falling during transportation and hoisting;

[0087] 3, The stirrup is bound or welded on the main framework according to the design requirements;

[0088] 4, The main reinforcement, stirrup, limiting ring and connecting plate form a complete steel reinforcement framework, and the steel reinforcement framework is directly transported to the site;

[0089] 5, Steel connection is carried out on site, and the reserved main reinforcement 8 of the lower concrete column is inserted into the corresponding main reinforcement sleeve ring of the column bottom restraint and limiting ring 5 of the column body;

[0090] 6, Because the lower column has been poured with concrete, the main reinforcement cannot be moved, and the main reinforcement of the bottom column inserted into the sleeve ring is fixed, so the main reinforcement in the sleeve ring of the column is adjusted by adjusting the position up and down and rotating into the threaded sleeve to complete the butt joint;

[0091] 7, Formwork;

[0092] 8, Concrete pouring, curing and molding;

[0093] 9, Demolish the formwork according to the required time;

[0094] 10, Completed.

[0095] The above structure and process can also be used for the construction of special-shaped concrete main body, such as trapezoidal column. Only the size and shape need to be adjusted according to the specific situation.

Claims

1. A prefabricated forming device for a concrete column reinforcement cage, provided with a lower concrete column main reinforcement (8), a current concrete column main reinforcement (1) and a concrete column stirrup (2), characterized in that: It includes column top restraint and limiting ring (3), column bottom restraint and limiting ring (5); column top restraint and limiting ring (3) includes upper ring body (3-1), upper main reinforcement sleeve ring (3-3), upper branch (3-2); upper ring body (3-1) is parallel with concrete column stirrup (2); upper ring body (3-1) is provided with upper main reinforcement sleeve ring (3-3) at inner corner, and the concrete column main reinforcement (1) is inserted into the upper main reinforcement sleeve ring (3-3); the upper branch (3-2) is arranged along the length direction of the column body and is connected with the upper ring body (3-1); the column bottom restraint and limiting ring (5) is the same structure with the column top restraint and limiting ring (3), the column bottom restraint and limiting ring (5) includes bottom ring body (5-1), bottom main reinforcement sleeve ring (5-3), lower branch (5-2); the lower branch (5-2) of the column bottom restraint and limiting ring (5) is opposite to the upper branch (3-2) of the column top restraint and limiting ring (3); The column top restraint and limiting ring (3) and the column bottom restraint and limiting ring (5) are provided with column interval restraint and limiting ring (4); the column top restraint and limiting ring (3), the column bottom restraint and limiting ring (5) and the column interval restraint and limiting ring (4) are limitedly connected through limiting ring connecting plate (6), and the limiting ring connecting plate (6) is arranged along the length direction of the concrete column.

2. The prefabricating and forming device for the reinforcement cage of a concrete column according to claim 1, characterized in that: The column interval restraint and limiting ring (4) includes intermediate ring body (4-1) and intermediate main reinforcement sleeve ring (4-3) arranged at the inner corner of the intermediate ring body (4-1), and the concrete column main reinforcement (1) is inserted into the intermediate main reinforcement sleeve ring (4-3).

3. The device according to claim 1, characterized in that: The lower layer concrete column main reinforcement (8) and the concrete column main reinforcement (1) are provided with column main reinforcement joint position (7).

4. The apparatus according to claim 1, wherein: The bottom ring body (5-1) is parallel with the concrete column stirrup (2); the bottom ring body (5-1) is provided with bottom main reinforcement sleeve ring (5-3) at the inner corner, and the lower layer concrete column main reinforcement (8) is inserted into the bottom main reinforcement sleeve ring (5-3); the lower branch (5-2) is arranged along the length direction of the column body and is connected with the bottom ring body (5-1).

5. A method for prefabricating a concrete column reinforcement cage forming device according to any one of claims 1 to 4, characterized in that, The steps are: 1) according to the specification and quantity of the concrete reinforcement, the column top restraint and limiting ring (3), the column interval restraint and limiting ring (4), the column bottom restraint and limiting ring (5) and the limiting ring connecting plate (6) are prepared; 2) column main reinforcement and stirrup blanking for standby: according to the design requirements, traditional process; 3) series limiting ring, form skeleton: according to the design positioning requirements, the column top restraint and limiting ring (3), the column bottom restraint and limiting ring (5) and the column interval restraint and limiting ring (4) are welded into one by the limiting ring connecting plate (6); 4) the concrete column main reinforcement (1) of this layer: according to the design requirements, the concrete column main reinforcement (1) of this layer is inserted into the corresponding main reinforcement sleeve ring respectively, and is temporarily fixed to prevent falling during transportation and installation; 5) wear concrete column stirrup (2): the concrete column stirrup (2) is only fixed with the limiting ring connecting plate (6), and the completion is achieved.

6. A method for full-site pouring construction using the prefabricated forming device for a concrete column reinforcement cage according to any one of claims 1-4, characterized in that, The steps are: 1) in the factory, the column top restraint and limiting ring (3), the column interval restraint and limiting ring (4), the column bottom restraint and limiting ring (5) and the limiting ring connecting plate (6) are preconnected to form the main skeleton; 2) The main reinforcement (1) of the concrete column is inserted into the respective main reinforcement sleeve and temporarily fixed to prevent falling during transportation and lifting; 3) The stirrup is tied or welded on the main framework according to the design requirements; 4) The main reinforcement, stirrup, limiting ring and connecting plate form a complete steel reinforcement framework, and the steel reinforcement framework is directly transported to the site; 5) The steel reinforcement is connected on site, and the reserved main reinforcement (8) of the lower layer concrete column is inserted into the corresponding main reinforcement sleeve of the column bottom restraint and limiting ring (5); 6) Because the lower layer column has been poured with concrete, the main reinforcement cannot be moved, and the main reinforcement inserted into the sleeve of the bottom layer column is fixed, so the main reinforcement in the sleeve of the current layer column is adjusted by adjusting the position and rotating the threaded sleeve, and the connection is completed; 7) The formwork is supported; 8) The concrete is poured and cured to form; 9) The formwork is removed according to the required time; 10) The work is completed.

7. A factory formed non-dismantling formwork hollow column comprising the prefabricated forming device for a concrete column reinforcement cage according to any one of claims 1-4, characterized in that: The outside of the concrete column steel reinforcement framework prefabrication forming device is provided with a removable formwork (C); the removable formwork (C) is provided with a steel reinforcement protective layer pad (B) between the column top restraint and limiting ring (3) or the column interval restraint and limiting ring (4) or the column bottom restraint and limiting ring (5); and the self-tapping screw (A) passes through the removable formwork (C) and the column top restraint and limiting ring (3) or the column interval restraint and limiting ring (4) or the column bottom restraint and limiting ring (5) to position.

8. A method of construction using the factory formed, non-dismantling form hollow column of claim 7, wherein, The steps are as follows: 1) Removable formwork preparation: the removable formwork is a cement-based material compatible with concrete; 2) The removable formwork (C) is cut according to the size of the column; 3) The steel reinforcement protective layer pad (B) is placed outside the steel reinforcement framework according to the design requirements; 4) The removable formwork (C) is fixed on the steel reinforcement framework with self-tapping screws (A), and the steel reinforcement joint position is not fixed first, leaving an operation opening; 5) The prefabricated hollow column is transported to the construction site; 6) Hoisting and positioning: at this time, the reserved main reinforcement of the next layer is accurately inserted into the bottom main reinforcement sleeve (5-3) of the column bottom restraint and limiting ring (5); the lower leg (5-2) of the column bottom restraint and limiting ring (5) contacts the structural layer of the lower layer and forms a temporary stable structure; 8) Column adjustment and temporary support setting to prevent misalignment: traditional process method; 9) Main reinforcement lapping: because the main reinforcement of the column is in the sleeve and can be freely moved, threaded sleeve connection or welding can be used; 10) After the joint is checked and no error is found, the operation opening is sealed with the removable formwork (C), and the self-tapping screw (A) is locked; 11) The concrete is poured and cured to form.

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