Hollow steel skeleton prefabricated column of column built-in combined metal template

Abstract

The application discloses a hollow steel skeleton prefabricated column with built-in combined metal formwork, which comprises a column body, a combined metal formwork arranged in the column body, a space formed on the inner side of the combined metal formwork, a cavity formed in the middle of the column body through the space, an annular concrete entity formed on the outer side of the combined metal formwork, and a steel reinforcement cage arranged in the column body, wherein the upper end and the lower end of the steel reinforcement cage respectively extend above and below the annular concrete entity, and the steel reinforcements at the upper end and the lower end of the steel reinforcement cage are staggered with each other; a steel plate hoop is arranged at the lower end of the steel reinforcement cage to form a self-supporting supporting surface. The hollow cavity reduces the overall weight, the concrete entity around the cavity can be poured and cured at one time under the limitation of the combined metal formwork, and the production efficiency of the prefabricated column is greatly improved. The prefabricated columns of adjacent floors are overlapped in the steel reinforcement cage and poured, so that the connection quality of the prefabricated columns of adjacent floors is more controllable.

Description

TECHNICAL FIELD

[0001] The present application relates to the hollow prefabricated column in the field of fabricated building, in particular to a hollow steel skeleton prefabricated column with built-in combined metal formwork, more particularly to a hollow steel skeleton prefabricated column with built-in combined metal formwork, which is formed by setting a built-in combined metal formwork in the steel skeleton column prefabricated segment part to constrain the hoop and longitudinal reinforcement of the column, and at the same time the combined metal formwork separates the prefabricated column segment into an internal cavity and a cavity external annular concrete entity, wherein the cavity of the prefabricated segment is poured with concrete after installation at the construction site, and the cavity external annular concrete entity is poured with concrete when manufactured in the factory. BACKGROUND

[0002] Traditional housing construction technology has low production efficiency, slow construction speed, long construction period, high material consumption, serious site pollution and high labor intensity, which cannot meet the demand of the healthy and sustainable development of the construction industry in China. And the prefabricated concrete building is widely used in various construction projects because of its efficient industrialized production, intensive and fast construction process, and green and environmentally friendly construction process.

[0003] At present, the connection between the upper and lower prefabricated columns in the assembled monolithic concrete structure mainly includes two types: steel sleeve connection (pre-buried connection sleeve in the prefabricated segment) and cavity lap joint (reserved cavity in the prefabricated segment).

[0004] The grouting connection in the existing sleeve connection needs to complete the pouring connection between the beam and the lower prefabricated column at the node first, and then connect the steel bars of the upper and lower prefabricated columns through the grouting sleeve after the node concrete reaches the initial strength. The above process has the following defects: there are multiple grouting sleeves in a single prefabricated column, and it is difficult to ensure that the longitudinal reinforcement of the lower prefabricated column of the adjacent layer is inserted into the sleeve of the upper prefabricated column during the installation stage; during the grouting stage, it is impossible to detect the anchoring quality of the steel bars in the sleeve and the strength of the grouting material. In addition, due to the large weight of the prefabricated column segment, the original tower crane at the construction site needs to be replaced by a tower crane with larger lifting capacity, which leads to the increase of the overall cost of the project.

[0005] The construction process of the existing cavity prefabricated column is briefly described as follows: during production in the prefabricated component factory, the prefabricated steel reinforcement cage of the prefabricated column is bound and hoisted into the mold, the concrete entity on one side is poured and cured to the specified strength, and then the prefabricated column is turned over by a turning equipment (special equipment) and the concrete entity on the other side is poured. Since the prefabricated column has four sides, the above process needs to be repeated four times. The above production process relies on special equipment and needs to cure the concrete entity on four sides in four times, which makes the production efficiency of the prefabricated column relatively low. SUMMARY

[0006] The technical problem to be solved by the present application is to provide a hollow steel skeleton prefabricated column with built-in combined metal formwork, which reduces the overall weight through the cavity in the middle, and can reduce the weight to about 1 / 3 of the weight of the existing solid prefabricated column. The concrete entity around the cavity can be formed by one-time pouring and one-time curing under the limitation of the combined metal formwork, greatly improving the production efficiency of the prefabricated column. The prefabricated columns of adjacent floors are nested with each other through the steel reinforcement cage, and are connected and poured in the steel reinforcement cage. The quality detection of the connecting part of the prefabricated columns of adjacent floors can use the detection means of cast-in-place columns, so that the connecting quality of the prefabricated columns of adjacent floors is more controllable.

[0007] To solve the above technical problems, the technical solution adopted by the present application is as follows:

[0008] A hollow steel skeleton prefabricated column with built-in combined metal formwork, characterized in that: a column body is provided, a combined metal formwork is arranged in the column body, the inner side of the combined metal formwork surrounds a space, a cavity is formed in the middle of the column body through the space, the cavity penetrates the column body up and down, and an annular concrete entity is formed on the outer side of the combined metal formwork by pouring, which serves as a formwork for on-site pouring and is used to wrap the column body into a whole; a steel reinforcement cage is further arranged in the column body, the upper end and the lower end of the steel reinforcement cage respectively extend above and below the annular concrete entity, the steel bars at the upper end and the lower end of the steel reinforcement cage are staggered with each other, so that when the prefabricated columns of adjacent floors are connected, the lower end of the steel reinforcement cage of the upper prefabricated column can be nested with the upper end of the steel reinforcement cage of the lower prefabricated column; a steel plate hoop is arranged at the lower end of the steel reinforcement cage, and a supporting surface for self-supporting is formed at the lower end of the steel reinforcement cage through the steel plate hoop.

[0009] Optionally, the combined metal formwork is arranged in the steel reinforcement cage, and the four surrounding parts of the steel reinforcement cage are embedded in the annular concrete entity, and the combined metal formwork is attached to the inner side of the annular concrete entity.

[0010] Optionally, the combined metal formwork comprises a plurality of metal formwork units, the metal formwork units are stacked one above the other, and the metal formwork units adjacent to each other are nested together, the steel reinforcement cage comprises longitudinal reinforcement and stirrups, the stirrups are arranged horizontally, the stirrups are inserted into the connecting parts between the metal formwork units adjacent to each other, the stirrups are limited by the metal formwork units, and the metal formwork units above the stirrups are supported by the stirrups.

[0011] Optionally, the metal formwork units are provided with mounting grooves, the stirrups comprise outer stirrups and inner stirrups, the outer stirrups are sleeved around the outer periphery of the steel reinforcement cage, and the inner stirrups are inserted into the inner side, and the inner stirrups are respectively clamped in the mounting grooves.

[0012] Optionally, the metal formwork units are hollow four-prism-taiprism metal shells, one end of the four-prism-taiprism metal shell is larger than the other end, so that the end parts of the upper and lower four-prism-taiprism metal shells can be nested with each other.

[0013] Optionally, the metal formwork unit comprises a hollow first rectangular metal shell and a second rectangular metal shell, the first rectangular metal shell has a size larger than the second rectangular metal shell, so that the first rectangular metal shell can be sleeved on the second rectangular metal shell, and the first rectangular metal shell and the second rectangular metal shell are alternately stacked.

[0014] Optionally, the combined metal formwork is surrounded outside the steel reinforcement cage, and the combined metal formwork is attached to the inner side of the annular concrete entity.

[0015] Optionally, the combined metal formwork comprises a columnar metal shell, a steel mesh sheet and a tie member, the columnar metal shell is attached to the inner side of the annular concrete entity, the steel mesh sheet is located outside the columnar metal shell and is embedded in the annular concrete entity, and the tie member is inserted into the column, and two ends of the tie member are connected with the steel mesh sheet.

[0016] Optionally, the longitudinal reinforcement is uniformly distributed around the steel reinforcement cage, the lower end of the longitudinal reinforcement vertically extends downward to below the annular concrete entity, the upper end of the longitudinal reinforcement extends upward to above the annular concrete entity, but the upper end of the longitudinal reinforcement is bent inwardly and offset, so that the upper end of the longitudinal reinforcement is staggered with the lower end.

[0017] Optionally, the steel plate hoop comprises a plurality of spaced transverse steel plates and a plurality of spaced longitudinal steel plates, the transverse steel plates and the longitudinal steel plates are welded together, the lower end of the longitudinal reinforcement is welded with the steel plate hoop, and a reinforcing rib is arranged in the middle of the steel plate hoop, the lower end of the reinforcing rib is welded with the middle of the steel plate hoop, and the upper end of the reinforcing rib extends into the cavity.

[0018] Compared with the prior art, the present application has the following beneficial effects:

[0019] 1. The hollow cavity in the middle of the prefabricated column formed by the space surrounded by the combined metal formwork reduces the overall weight, which can be reduced to about 1 / 3 of the weight of the existing solid prefabricated column, thereby correspondingly reducing the size of the on-site hoisting equipment and reducing the cost. On the other hand, since most of the concrete of the hollow prefabricated column is cast on site, the cost of the prefabricated component can be reduced.

[0020] 2. When the prefabricated columns of adjacent layers are connected by pouring, the lower end of the steel reinforcement cage of the upper layer of prefabricated columns is nested with the upper end of the steel reinforcement cage of the lower layer of prefabricated columns, and the connection part will be exposed on the upper surface of the floor slab, so that the quality detection of the connection part can use the detection means of the cast-in-place column during pouring, and the detection is simpler, so that the connection quality of the prefabricated columns of adjacent floors is more controllable.

[0021] The connection of the prefabricated columns of adjacent layers of the present application does not need to use a steel sleeve, and the construction difficulty is lower, the construction is easier, and the construction cost is lower.

[0022] 3、The prefabricated column of the present application is provided with a combined metal formwork, an annular concrete entity is formed by the limitation of the combined metal formwork, and the steel reinforcement cage is effectively constrained, so that the concrete entity can be poured at one time and cured at one time during the production in the factory, and the component does not need to be poured and cured for multiple times, that is, the turnover equipment is not needed.

[0023] 4、The annular concrete entity is wrapped into a whole, a supporting surface is formed by the steel plate hoop at the lower end, so that the prefabricated column can support itself and can be used as a temporary support during the construction and installation.

[0024] 5、In addition, in a further structure, the combined metal formwork of the present application can also be composed of a plurality of metal formwork units stacked one above another and nested together, and the stirrup is limited by the metal formwork unit, so that the present application has lower material consumption and lower labor cost, and the processing efficiency can be greatly improved compared with the existing stirrup connected by welding. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a front view schematic diagram of the hollow steel skeleton prefabricated column of the first embodiment of the present application;

[0026] Figure 2 is a combined schematic diagram of the steel reinforcement cage and the combined metal formwork of the hollow steel skeleton prefabricated column of the first embodiment of the present application;

[0027] Figure 3 is Figure 1 a sectional view schematic diagram of A-A;

[0028] Figure 4 is Figure 1 a sectional view schematic diagram of B-B;

[0029] Figure 5 is a three-dimensional schematic diagram of the quadrangular frustum metal shell of the first embodiment of the present application;

[0030] Figure 6 is an assembly schematic diagram of the quadrangular frustum metal shell and the stirrup of the first embodiment of the present application;

[0031] Figure 7 is a three-dimensional schematic diagram of the first rectangular metal shell of the second embodiment of the present application;

[0032] Figure 8 is an assembly schematic diagram of the first rectangular metal shell, the second rectangular metal shell and the stirrup of the second embodiment of the present application;

[0033] Figure 9is a structural schematic view of the hollow steel skeleton prefabricated column of the present application in the field connection of adjacent layers;

[0034] Figure 10 is a front view schematic view of the hollow steel skeleton prefabricated column of the embodiment three of the present application;

[0035] Figure 11 is a front view perspective view of the hollow steel skeleton prefabricated column of the embodiment three of the present application;

[0036] Figure 12 is a side view perspective view of the hollow steel skeleton prefabricated column of the embodiment three of the present application;

[0037] Figure 13 is Figure 11 a sectional view schematic view at C-C;

[0038] Figure 14 is a structural schematic view of the double limb tie member of the embodiment three of the present application;

[0039] Figure 15 is a structural schematic view of the single limb tie member of the embodiment three of the present application;

[0040] Figure 16 is a three-dimensional schematic view of the columnar metal shell of the embodiment three of the present application;

[0041] Figure 17 is a three-dimensional schematic view of the steel mesh sheet of the embodiment three of the present application.

[0042] The meaning of the reference signs in the drawing is as follows:

[0043] 1, longitudinal reinforcement; 1-1, upper end of longitudinal reinforcement; 1-2, lower end of longitudinal reinforcement; 1-3, bent part; 2, ring-shaped concrete entity; 3, combined metal formwork; 3-1, quadrangular prism metal shell; 3-2, first rectangular metal shell; 3-3, columnar metal shell; 3-4, mounting groove; 3-5, second rectangular metal shell; 4, stirrup; 4-1, outer stirrup; 4-2, inner stirrup; 5, steel plate hoop; 5-1, transverse steel plate; 5-2, longitudinal steel plate; 6, reinforcing bar; 10, cavity; 11, floor slab; 12, steel mesh sheet; 13, double limb tie member; 13-1, first locking bolt; 13-2, first pressing plate; 13-3, U-shaped tie rod; 14, single limb tie member; 14-1, second locking bolt; 14-2, second pressing plate; 14-3, straight rod. DETAILED DESCRIPTION

[0044] The present application is further described below in combination with embodiments.

[0045] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by the upper, lower, front, rear, left, right and the like, is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0046] In the description of the present application, one or more is understood as one or more, more than two is understood as more than two, greater than, less than, more than, etc. are understood as not including the number, above, below, etc. are understood as including the number. If the first, second is described, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.

[0047] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting and the like should be broadly understood, and those skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0048] Embodiment one:

[0049] As Figures 1 to 6 The hollow steel skeleton prefabricated column of the column built-in combined metal formwork of embodiment one is shown in the figure, which includes a column body, a combined metal formwork 3 is arranged in the column body, the combined metal formwork 3 is hollow columnar, the inner side of the combined metal formwork 3 forms a space, the space forms a cavity 10 in the middle of the column body, the cavity 10 penetrates the column body up and down, and the weight of the prefabricated column as a whole is reduced through the cavity 10. The outer side of the combined metal formwork 3 is poured to form an annular concrete entity 2, which is used as a formwork during site pouring and is used to wrap the column body into a whole.

[0050] During the production of the prefabricated column in the factory, the annular concrete entity 2 can be poured at one time through the limitation of the combined metal formwork 3 and the mold table of the factory, and then one curing is performed. The component does not need to be poured and turned over multiple times in the factory, that is, it does not need to rely on the turning equipment, and compared with the structure of the cavity prefabricated column in the background art which needs to be poured and cured four times, the production efficiency of the cavity prefabricated column is greatly improved.

[0051] Among them, a steel cage is arranged in the column body. The combined metal formwork 3 of the embodiment is arranged in the steel cage, the four peripheral parts of the steel cage are embedded in the annular concrete entity 2, and the combined metal formwork 3 is attached to the inner side of the annular concrete entity.

[0052] The specific structure of the reinforcement cage is as follows: the reinforcement cage comprises longitudinal reinforcement 1 and stirrup 4, the longitudinal reinforcement 1 is uniformly distributed on the periphery of the reinforcement cage, and surrounds the outside of the combined metal formwork 3, the stirrup 4 is horizontally arranged, and the stirrup 4 is provided with multiple layers at intervals. The stirrup 4 comprises outer stirrup 4-1 and inner stirrup 4-2, the outer stirrup 4-1 is a square, the side length is less than the side length of the cylinder, and the outer stirrup 4-1 is sleeved on the periphery of the reinforcement cage, and the inner stirrup 4-2 is inserted on the inner side, and the two ends of the inner stirrup 4-2 are connected with the side of the outer stirrup 4-1.

[0053] The combined metal formwork 3 of the embodiment comprises a plurality of metal formwork units, as shown in Figure 6 The metal formwork units are stacked in sequence from top to bottom, and the metal formwork units adjacent to each other are nested together, so as to form an integrated combined metal formwork. The metal formwork unit is provided with a mounting groove, and in the assembly process, the inner stirrup 4-2 is inserted into the connection between the metal formwork units adjacent to each other, the inner stirrup 4-2 is first clamped in the mounting groove 3-4 on the upper edge of the lower metal formwork unit, and the outer stirrup 4-1 is sleeved on the outer side of the metal formwork unit, and then the upper metal formwork unit is assembled, the lower edge of the upper metal formwork unit is correspondingly nested on the upper edge of the lower metal formwork unit and supported on the inner stirrup 4-2, so that the metal formwork unit limits the stirrup, and the stirrup supports the metal formwork unit above it. Compared with the existing stirrup connected by welding, the above-mentioned structure has lower connection consumables and lower labor, and can greatly improve the processing efficiency.

[0054] The specific structure of the metal formwork unit of the embodiment is as follows: as shown in Figure 5 and Figure 6 The metal formwork unit is a hollow quadrangular frustum metal shell 3-1, which is surrounded by four trapezoidal metal plates, and the opening at one end of the quadrangular frustum metal shell 3-1 is larger than the opening at the other end, so that the end portions of the two quadrangular frustum metal shells 3-1 can be nested with each other. One preferred size of the two ends of the quadrangular frustum metal shell 3-1 is that the side length of the large end is greater than the side length of the small end by 2-4 mm.

[0055] The lower end 1-2 of the longitudinal reinforcement 1 vertically extends downward to the lower side of the annular concrete entity 2, the upper end 1-1 of the longitudinal reinforcement 1 extends upward to the upper side of the annular concrete entity 2, but the upper end 1-1 of the longitudinal reinforcement 1 is bent inward and offset, a bending portion 1-3 is formed at the bending position, so that the upper end 1-1 and the lower end 1-2 of the longitudinal reinforcement 1 are staggered with each other, and the lower end of the reinforcement cage of the upper prefabricated column can be nested with the upper end of the reinforcement cage of the lower prefabricated column when the prefabricated columns of adjacent floors are connected. The embodiment is provided with the stirrup 4 at the lower end of the longitudinal reinforcement 1, and is not provided with the stirrup 4 at the upper end.

[0056] The steel plate hoop 5 is welded at the lower end of the longitudinal reinforcement 1, and a supporting surface for self-supporting is formed at the lower end of the reinforcement cage by the steel plate hoop 5. As shown inFigure 4 As shown, the steel plate hoop 5 of the present embodiment comprises a plurality of transversely arranged steel plates 5-1 and a plurality of longitudinally arranged steel plates 5-2, wherein the number of the transversely arranged steel plates 5-1 and the longitudinally arranged steel plates 5-2 is set to four, and the transversely arranged steel plates 5-1 and the longitudinally arranged steel plates 5-2 are welded together to form a quadrangular steel plate hoop 5. The lower end of the longitudinal reinforcement 1 is welded to the inner side of the edge of the steel plate hoop 5. A reinforcing rib 6 is arranged in the middle of the steel plate hoop 5, and the lower end of the reinforcing rib 6 is welded to the intersection of the transversely arranged steel plates 5-1 and the longitudinally arranged steel plates 5-2, and the upper end of the reinforcing rib 6 extends into the cavity 10.

[0057] One specific processing procedure of the prefabricated column of the present embodiment is as follows:

[0058] 1. The longitudinal reinforcement 1 of the reinforcement cage is erected and positioned;

[0059] 2. The metal formwork unit is sleeved, and the center of the horizontal section of the metal formwork unit coincides with the center of the prefabricated column;

[0060] 3. One direction of the inner hoop rib 4-2 is clamped into one direction of the mounting groove 3-4 of the metal formwork unit;

[0061] 4. One outer hoop rib 4-1 is sleeved, and the inner surface of the outer hoop rib 4-1 tightly abuts the outer surface of the longitudinal reinforcement 1, and is erected on the inner hoop rib 4-2;

[0062] 5. The other direction of the column inner hoop rib 4-2 is clamped into the other direction of the mounting groove 3-4 of the metal formwork unit;

[0063] 6. The metal formwork unit of the upper layer is installed, and the parts between the metal formwork units of the upper and lower layers are nested with each other to limit the displacement of the metal formwork unit of the upper layer, and the metal formwork units of the upper and lower layers support the metal formwork unit of the upper layer through the inner hoop rib 4-2, and the metal formwork units of the upper and lower layers also limit the inner hoop rib 4-2;

[0064] 7. The steps 2-6 are repeated, the metal formwork units are sequentially stacked, and finally a complete combined metal formwork is formed, and the adjacent metal formwork units are nested with each other and the inner hoop ribs are engaged with each other, and the reinforcement cage and the combined metal formwork 3 form a whole;

[0065] 8. The whole in the field of the above step 7 is hoisted into the formwork of the factory, and the combined metal formwork 3 and the formwork of the factory are once poured with concrete, and the peripheral annular concrete entity 2 is formed at one time, and then one-time curing is performed.

[0066] In the construction site, when connecting the prefabricated columns of adjacent floors, for example, Figure 9As shown, the upper end 1-1 of the longitudinal reinforcement 1 of the lower prefabricated column will be out of the upper surface of the floor 11, the upper prefabricated column can be supported on the upper surface of the floor 11 through the supporting surface, the lower end of the reinforcement cage of the upper prefabricated column is sleeved on the upper end 1-1 of the longitudinal reinforcement of the lower prefabricated column, and the upper and lower prefabricated columns are connected through the reinforcement cage, the connecting part of the upper and lower prefabricated columns is located on the upper surface of the floor 11 and leaks out of the upper surface, and then after pouring the cavity 10 and the connecting part, the formwork on site is removed, the quality of the connecting part of the upper and lower prefabricated columns can be detected, the detection means of the cast-in-place column can be used, the detection is simpler and more reliable, and the connecting quality of the prefabricated columns of adjacent floors is more controllable.

[0067] Embodiment two:

[0068] The hollow steel framework prefabricated column of the column built-in combined metal formwork of embodiment two is different from that of embodiment one in the structure of the combined metal formwork 3.

[0069] As shown in Figure 7 and Figure 8 , the combined metal formwork 3 of embodiment two includes a hollow first rectangular metal shell 3-2 and a second rectangular metal shell 3-5, the first rectangular metal shell 3-2 and the second rectangular metal shell 3-5 are straight cylinders with a rectangular horizontal cross section and are composed of four rectangular plates, the first rectangular metal shell 3-2 and the second rectangular metal shell 3-5 are each provided with a mounting groove 3-4, the size of the first rectangular metal shell 3-2 is greater than that of the second rectangular metal shell 3-5, so that the first rectangular metal shell 3-2 can be sleeved on the second rectangular metal shell 3-5, and the first rectangular metal shell 3-2 and the second rectangular metal shell 3-5 are alternately stacked. One preferred size of the first rectangular metal shell 3-2 and the second rectangular metal shell 3-5 is that the side length of the first rectangular metal shell 3-2 is greater than that of the second rectangular metal shell 3-5 by 2-4 mm.

[0070] One specific processing process of the prefabricated column of the embodiment is as follows:

[0071] 1. The longitudinal reinforcement 1 of the reinforcement cage is erected and positioned;

[0072] 2. A first rectangular metal shell 3-2 is sleeved, and the center of the horizontal cross section of the first rectangular metal shell 3-2 coincides with the center of the prefabricated column;

[0073] 3. The inner stirrup 4-2 in one direction is clamped into the mounting groove 3-4 in one direction of the first rectangular metal shell 3-2;

[0074] 4. An outer stirrup 4-1 is sleeved, the inner surface of the outer stirrup 4-1 closely abuts the outer surface of the longitudinal reinforcement 1, and the outer stirrup 4-1 is erected on the inner stirrup 4-2;

[0075] 5, the other direction of the inner hoop 4-2 is clamped into the installation groove 3-4 of the other direction of the metal mold plate unit;

[0076] 6, the second rectangular metal shell 3-5 is sleeved, the lower end of the second rectangular metal shell 3-5 is embedded into the upper end of the first rectangular metal shell 3-2, the displacement of the second rectangular metal shell 3-5 is limited, the second rectangular metal shell 3-5 is supported by the inner hoop 4-2, and the first rectangular metal shell 3-2 and the second rectangular metal shell 3-5 also limit the inner hoop 4-2;

[0077] 7, the inner hoop 4-2 of one direction is clamped into the installation groove 3-4 of one direction on the upper edge of the second rectangular metal shell 3-5;

[0078] 8, the outer hoop 4-1 is sleeved again, and the inner surface of the outer hoop 4-1 is tightly attached to the outer surface of the longitudinal reinforcement 1 and is erected on the inner hoop 4-2;

[0079] 9, the inner hoop 4-2 of the other direction is clamped into the installation groove 3-4 of the other direction on the upper edge of the second rectangular metal shell 3-5;

[0080] 10, the first rectangular metal shell 3-2 of the last layer is sleeved again;

[0081] 11, the steps 2-10 are repeated, the first rectangular metal shell 3-2 and the second rectangular metal shell 3-5 are sleeved alternately and stacked together, the positions between the adjacent first rectangular metal shell 3-2 and the second rectangular metal shell 3-5 are nested with each other, and the inner hoop 4-2 is engaged with each other, the steel cage and the combined metal mold plate 3 form an integral whole;

[0082] 12, the integral whole formed by the step 11 is hoisted into the mold plate of the factory, the combined metal mold plate and the mold plate of the factory are once poured with concrete, and the peripheral annular concrete entity 2 is formed at one time, and then one-time curing can be carried out.

[0083] Example three:

[0084] As Figures 10 to 17 the hollow steel frame prefabricated column of the column built-in combined metal mold plate of example three, which is different from example one in the structure of the combined metal mold plate 3 and the assembly relationship between the combined metal mold plate 3 and the steel cage.

[0085] The combined metal mold plate 3 of example three includes a columnar metal shell 3-3, a wire mesh 12 and a tie member, as Figure 16As shown, the columnar metal shell 3-3 is hollow, with a horizontal cross-section in the shape of a rectangle composed of four flat plates, and is an integral structure. The columnar metal shell 3-3 is attached to the inner side of the annular concrete entity 2, and is surrounded by the outer side of the steel reinforcement cage, with the side of the steel reinforcement cage abutting against the inner side of the columnar metal shell 3-3. The steel mesh 12 is located on the outer side of the columnar metal shell 3-3 and is embedded in the annular concrete entity 2, and the tie members are inserted into the column, with both ends of the tie members passing through the columnar metal shell 3-3 and being connected to the steel mesh 12.

[0086] As shown, Figures 13 to 15 the tie members include double-limb tie members 13 and single-limb tie members 14, which are used to connect the steel mesh 12. As shown, Figure 14 the double-limb tie member 13 includes a U-shaped tie rod 13-3, a first pressing plate 13-2, and a first locking bolt 13-1, the first pressing plate 13-2 is provided with two first through holes, both ends of the U-shaped tie rod 13-3 pass through the two first through holes respectively, and both ends of the U-shaped tie rod 13-3 are threadedly connected with the first locking bolt 13-1 respectively. The single-limb tie member 14 includes a straight rod 14-3, a second pressing plate 14-2, and a second locking bolt 14-1, the second pressing plate 14-2 is provided with two second through holes, one end of the straight rod 14-3 is provided with a hook, the other end passes through the second through hole of the second pressing plate 14-2 and is threadedly connected with the second locking bolt 14-1. Since the distance between the rods of the tie members has a standard requirement, the double-limb tie member 13 and the single-limb tie member 14 can be selected according to the size of the prefabricated column. As shown, Figure 13 the prefabricated column of the embodiment combines the use of the double-limb tie member 13 and the single-limb tie member 14, in one cross-section, one double-limb tie member 13 and one single-limb tie member 14 are used transversely and side by side, and one double-limb tie member 13 and one single-limb tie member 14 are also used longitudinally and side by side. Both the double-limb tie member 13 and the single-limb tie member 14 pass through the columnar metal shell and cross the cavity 10 in the middle, and the columnar metal shell 3-3 and the steel mesh 12 are connected and tied by the tie members.

[0087] Among them, the columnar metal shell 33 and the steel mesh 12 can be improved to other materials and shapes. When the part of the annular concrete entity 2 outside the cavity 10 adopts ultra-high performance concrete, the steel mesh 12 can not be arranged.

[0088] The thickness of the side wall of the ring-shaped concrete entity 2 is preferably 20 mm when the ring-shaped concrete entity 2 is used as a formwork for pouring a column at a construction site, and is preferably 20-40 mm when the ring-shaped concrete entity 2 is used as a protective layer for a prefabricated column at a construction site. The above is a description of the commonly used thickness of the ring-shaped concrete entity 2. The thickness of the side wall of the ring-shaped concrete entity 2 can be adjusted according to design requirements in the case of using high-performance materials or in a special environment.

[0089] The above embodiments of the present application are not intended to limit the scope of protection of the present application, and the embodiments of the present application are not limited thereto. Any other modifications, replacements or changes to the above structure of the present application, which are made according to the above content of the present application and in accordance with ordinary technical knowledge and common practice in the art, without departing from the above basic technical idea of the present application, shall fall within the scope of protection of the present application.

Claims

1. A hollow steel frame precast column with an internal composite metal formwork, characterized in that: The column comprises a combined metal formwork, the inner side of which forms a space, through which a cavity is formed in the middle of the column, the cavity penetrating the column from top to bottom, while the outer side of the combined metal formwork is formed with an annular concrete entity, which is used as a formwork during casting and for wrapping the column into a whole; a steel cage is arranged in the column, the upper end and the lower end of the steel cage extending above and below the annular concrete entity respectively, the steel bars of the upper end and the lower end of the steel cage being staggered with each other, so that the lower end of the steel cage of the upper layer of the prefabricated column can be nested with the upper end of the steel cage of the lower layer of the prefabricated column when connecting the prefabricated columns of adjacent floors; a steel plate hoop is arranged at the lower end of the steel cage, and a self-supporting supporting surface is formed at the lower end of the steel cage through the steel plate hoop; The combined metal formwork comprises a plurality of metal formwork units, which are stacked one above another and nested with each other between the adjacent metal formwork units; the steel cage comprises longitudinal bars and stirrups, the stirrups being arranged horizontally and penetrating the connection between the adjacent metal formwork units, the stirrups being limited by the metal formwork units and supporting the metal formwork units above them.

2. The hollow steel skeleton precast column of the column-embedded combined metal formwork according to claim 1, characterized in that: The combined metal formwork is arranged in the steel cage, the peripheral part of the steel cage being embedded in the annular concrete entity, and the combined metal formwork being attached to the inner side of the annular concrete entity.

3. The hollow steel skeleton precast column of the column-embedded combined metal formwork according to claim 1, characterized in that: The metal formwork units are provided with mounting grooves, the stirrups comprise outer stirrups and inner stirrups, the outer stirrups being sleeved around the outer periphery of the steel cage, and the inner stirrups being embedded in the inner side and clamped in the mounting grooves.

4. The hollow steel skeleton precast column of the column-embedded composite metal formwork according to claim 3, characterized in that: The metal formwork units are hollow quadrangular frustum metal shells, one end of which is larger than the other end, so that the end parts of the upper and lower quadrangular frustum metal shells can be nested with each other.

5. The hollow steel skeleton precast column of the column-embedded composite metal formwork according to claim 3, characterized in that: The metal formwork units comprise hollow first and second rectangular metal shells, the size of the first rectangular metal shell being larger than that of the second rectangular metal shell, so that the first rectangular metal shell can be sleeved on the second rectangular metal shell, and the first and second rectangular metal shells are alternately stacked.

6. The hollow steel skeleton precast column of the column-embedded composite metal formwork according to claim 1, characterized in that: The combined metal formwork surrounds the outer side of the steel cage, and is attached to the inner side of the annular concrete entity.

7. The hollow steel skeleton precast column of the column-embedded combined metal formwork according to claim 1 or 6, characterized in that: The combined metal formwork comprises a columnar metal shell, a steel wire mesh and a tie member, the columnar metal shell being attached to the inner side of the annular concrete entity, the steel wire mesh being arranged on the outer side of the columnar metal shell and embedded in the annular concrete entity, and the tie member penetrating the column, the two ends of the tie member being connected with the steel wire mesh respectively. 8.The hollow steel skeleton precast column of the column-embedded composite metal formwork according to claim 1, characterized in that: The longitudinal reinforcement is uniformly distributed around the reinforcement cage, the lower end of the longitudinal reinforcement extends vertically downward below the annular concrete entity, the upper end of the longitudinal reinforcement extends upward above the annular concrete entity, but the upper end of the longitudinal reinforcement is bent inwardly to offset from the lower end. 9.The hollow steel skeleton precast column of the column-embedded combined metal formwork according to claim 1, characterized in that: The steel plate hoop comprises a plurality of spaced transverse steel plates and a plurality of spaced longitudinal steel plates, the transverse steel plates and the longitudinal steel plates are welded together, the lower end of the longitudinal reinforcement is welded to the steel plate hoop, a reinforcing rib is arranged in the middle of the steel plate hoop, the lower end of the reinforcing rib is welded to the middle of the steel plate hoop, and the upper end of the reinforcing rib extends into the cavity.

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