Composite column and application structure and construction method thereof

Abstract

The invention discloses a composite column as well as an application structure and a construction method thereof, and aims to provide a composite column which can greatly reduce the hoisting weight of a prefabricated column so as to facilitate on-site hoisting construction and reduce the construction cost; and the number of the vertical steel bars connected through the grouting sleeve technology can be effectively reduced under the condition that the formwork erecting procedure on the construction site is not increased, and therefore the problem that the steel bars and the grouting sleeve cannot be aligned is effectively solved. The composite column comprises a hollow prefabricated column, the hollow prefabricated column comprises a prefabricated concrete column formwork and a prefabricated column reinforcement cage which are poured into a whole, a vertically-through column cavity is formed in the prefabricated concrete column formwork, and the prefabricated column reinforcement cage comprises vertical main reinforcements; the on-site overlapping structure comprises a plurality of vertical edge steel bars located in the column cavity and concrete which is poured in the column cavity in site and fills the column cavity. Before concrete is poured in the column cavity on site, the vertical side steel bars can move in the height direction of the hollow prefabricated column.

Description

Technical Field

[0001] The present invention relates to the technical field of building structures, and particularly relates to a composite column and its application structure and construction method. Background Art

[0002] In precast concrete structures, structural components such as reinforced concrete beams, slabs, columns, and stairs are usually prefabricated in factories and then transported to the construction site, and assembled into an integral structure using reasonable joint connection structures, which have the advantages of good quality, fast construction speed, and low construction intensity.

[0003] In traditional precast concrete structures, precast concrete solid columns are used for columns, and the connection between columns is completed through grouting sleeve technology. Since the cross-sectional size of columns is usually large and the weight of a single precast concrete solid column component is heavy, a large-sized tower crane needs to be equipped at the construction site to meet the hoisting requirements of precast concrete solid columns, increasing the construction cost. At the same time, each vertical steel bar (vertical steel bars usually include multiple vertical main steel bars and multiple vertical side steel bars, generally 2 - 4 vertical main steel bars and 4 - 20 vertical side steel bars) between precast concrete solid columns on the upper and lower floors needs to be connected through grouting sleeve technology, that is, the upper end of each vertical steel bar of the precast concrete solid column on the lower floor needs to be inserted into the grouting sleeve (the grouting sleeve is fixed at the lower end of the vertical steel bar) at the lower end of the corresponding vertical steel bar of the precast concrete solid column on the upper floor. In practice, it is found that due to the limitations of construction site conditions and management levels, when there are many vertical steel bars, it is difficult to accurately align all vertical steel bars, and it is easy to occur that some or all of the steel bars cannot be aligned with the grouting sleeve (that is, the steel bars cannot be inserted into the grouting sleeve), resulting in the failure to smoothly install the precast concrete solid column, and the on-site management cost is large, which greatly restricts the application of precast concrete structure technology in projects.

[0004] If the vertical steel bars between precast concrete solid columns on the upper and lower floors are connected by welding technology, the vertical side steel bars of the precast concrete solid column on the upper floor need to extend below the precast concrete solid column, exposing enough length and leaving enough space for the welding operation of vertical steel bars on the upper and lower floors; although this can effectively improve the problem that it is easy to occur that the steel bars cannot be aligned with the grouting sleeve when connecting vertical steel bars by grouting sleeve technology, after the welding connection of the vertical steel bars between precast concrete solid columns on the upper and lower floors is completed, formwork needs to be supported at the corresponding exposed parts of the precast concrete solid column, and then concrete is poured on site to connect the precast concrete solid columns on the upper and lower floors, which not only increases the construction steps, reduces the construction efficiency, but also easily affects the connection strength and stability between each precast concrete solid column.

[0005] Furthermore, in order to facilitate the on-site construction of precast concrete columns and reduce the type of tower crane on-site, some inventors currently fabricate precast concrete columns as hollow-section members first, reducing the weight of the precast concrete columns, thus facilitating on-site construction hoisting and reducing construction costs. However, in all current precast concrete hollow columns, all vertical steel bars are integrally cast with concrete in the factory. When installing precast concrete columns, there are still a large number of vertical steel bars connected by grouting sleeve technology, and it is relatively difficult to accurately align all vertical steel bars. It is easy to have problems where the steel bars cannot be inserted into the grouting sleeves, resulting in the inability to smoothly install precast concrete hollow columns, with a relatively large on-site management cost, which greatly restricts the application of precast concrete structure technology in projects.

[0006] For example, Chinese Patent Publication No. CN108516859, with the invention name of a fiber lightweight aggregate precast hollow concrete column, also has the above problems. Summary of the Invention

[0007] The purpose of the present invention is to provide a composite column, its application structure and construction method, which can not only greatly reduce the lifting weight of the precast column to facilitate on-site hoisting construction and reduce construction costs, but also effectively reduce the number of vertical steel bars connected by grouting sleeve technology without increasing the formwork process on the construction site, thus effectively improving the problem of misalignment between the steel bars and the grouting sleeves, enabling the precast column to be smoothly installed.

[0008] The technical solution of the present invention is as follows: A composite column, comprising: A hollow precast column, including a precast concrete column formwork and a precast column steel reinforcement cage cast integrally. There is a column cavity that runs through up and down inside the precast concrete column formwork, and the precast column steel reinforcement cage includes vertical main steel bars; An on-site composite structure, including several vertical side steel bars located inside the column cavity and concrete that is cast on-site inside the column cavity and fills the column cavity. Before the concrete is cast on-site inside the column cavity, each vertical side steel bar can move along the height direction of the hollow precast column. After the concrete cast on-site inside the column cavity hardens, the on-site composite structure and the hollow precast column form a composite column and jointly bear the load. When the composite column of this solution is actually installed and constructed, the parts that need to be lifted are the hollow precast column and the vertical side steel bars. After the hollow precast column and the vertical side steel bars are installed and constructed, concrete is then cast on-site into the column cavity of the hollow precast column. In this way, the lifting weight of the hollow precast column can be greatly reduced, the type of tower crane on the construction site can be reduced, so as to facilitate on-site hoisting construction and reduce construction costs.

[0009] During the actual installation and construction of the composite column in this solution, when the hollow precast column and the vertical side steel bars are hoisted together to the designed installation position, enough space is left between the lower end of the precast concrete column formwork and the concrete floor slab to provide room for the welding or mechanical connection operation of the vertical side steel bars. Then, the vertical side steel bars are moved downward, and the connection of each vertical side steel bar is achieved through welding or mechanical sleeves. Specifically, the lower end of the vertical side steel bar of the composite column is connected to the upper end of the vertical side steel bar of the structural column on the lower floor through welding or mechanical sleeves. Next, the hollow precast column is hoisted downward along the height direction of the hollow precast column to the upper surface of the concrete floor slab, and the vertical main steel bars are connected through the grouting sleeve technology. The grouting sleeve technology means that the upper end of the vertical main steel bar of the structural column on the lower floor is inserted into the grouting sleeve, and then grout is injected into the grouting sleeve to achieve the connection of the steel bars. Finally, concrete is directly poured into the column cavity. After the concrete poured on-site in the column cavity hardens, the on-site composite structure and the hollow precast column form a composite column that bears force together. In this way, only the vertical main steel bars in the composite column of this solution are connected through the grouting sleeve technology, and the rest of the vertical side steel bars are all connected through welding or mechanical connection. Therefore, the number of vertical steel bars connected through the grouting sleeve technology is effectively reduced, thus effectively improving the situation that it is easy to have the problem that the steel bars and the grouting sleeves cannot be fully aligned due to too many vertical steel bars in the same precast column using the grouting sleeve technology, enabling the smooth installation of the precast column. At the same time, when pouring concrete on-site in the column cavity, there is no need to formwork on-site, so the construction steps will not be increased, the construction efficiency is effectively improved, the construction cost is further reduced, and the connection strength and stability between the columns on different floors are also ensured.

[0010] Preferably, it further includes side steel bar positioners fixed in the column cavity. The side steel bar positioners include a number of vertical guiding holes, and the vertical side steel bars are slidably inserted into the vertical guiding holes. In this way, the side steel bar positioners can position and guide each vertical side steel bar, facilitating actual construction operations. At the same time, during the process of pouring concrete on-site in the column cavity, it ensures that the positions of the vertical side steel bars are in the set positions, which is beneficial to ensuring the strength and stability of the composite column itself after the concrete in the column cavity solidifies.

[0011] Preferably, the outer shape of the cross-section of the precast concrete column formwork is square, and the number of the vertical main steel bars is 2 - 4.

[0012] Preferably, on the inner wall of the column cavity, there are formwork stiffening structures corresponding to the vertical main steel bars. The formwork stiffening structures are integrally cast with the precast concrete column formwork, and the vertical main steel bars are completely or partially covered by the formwork stiffening structures. In this way, on the one hand, it is beneficial to improve the structural strength of the precast concrete column formwork. On the other hand, under the condition of ensuring the structural strength of the precast concrete column formwork, the wall thickness of the precast concrete column formwork can be further reduced, the lifting weight can be reduced, which is convenient for on-site lifting construction and reduces the construction cost.

[0013] Preferably, the prefabricated column steel reinforcement cage further includes stirrups. The maximum thickness of the precast concrete column formwork is T, and T = c + d, where c is the thickness of the steel bar protection layer and d is the diameter of the stirrup; The minimum thickness of the precast concrete column formwork is t, and t = c, where c is the thickness of the steel bar protection layer.

[0014] Preferably, the upper ends of the vertical main steel bars extend above the upper end of the precast concrete column formwork. After the concrete is cast in place and hardened in the column cavity, the upper ends of the vertical side steel bars extend above the upper end of the precast concrete column formwork. In this way, the vertical main steel bars and vertical side steel bars extending above the upper end of the precast concrete column formwork can pass through the concrete floor slab of the upper floor and serve as the connecting bars at the lower end of the structural column of the upper floor to ensure stable connection between the vertical steel bars of the structural columns on different floors.

[0015] Preferably, a grouting sleeve is provided at the lower end of the vertical main steel bar.

[0016] Preferably, each vertical side steel bar is close to or abuts against the inner wall of the column cavity, and each vertical side steel bar is distributed in sequence along the edge of the column cavity. In this way, after the concrete in the column cavity is cured, it is beneficial to improve the strength and stability of the composite column itself.

[0017] A composite column application structure includes an upper structural column, a lower structural column, and a concrete floor slab connecting the upper and lower structural columns. At least one of the upper and lower structural columns is a composite column; Both the upper and lower structural columns include vertical main steel bars and vertical side steel bars. The upper ends of the vertical main steel bars and vertical side steel bars of the lower structural column pass through the concrete floor slab and extend a set length out of the concrete floor slab; The vertical main steel bars between the upper and lower structural columns are connected through grouting sleeves, and the vertical side steel bars between the upper and lower structural columns are connected by welding or mechanical sleeves. In the composite column application structure of this solution, at least one of the upper and lower structural columns is a composite column. During the specific installation and construction of the composite column, only the vertical main steel bars are connected through the grouting sleeve structure, and the remaining vertical side steel bars are connected by welding or mechanical sleeves. Therefore, the number of vertical steel bars connected by the grouting sleeve technology is effectively reduced, thus effectively improving the situation where it is easy to have the problem that the steel bars and grouting sleeves cannot be fully aligned due to too many vertical steel bars in the same precast column using the grouting sleeve technology, enabling the smooth installation of the precast column; at the same time, when the concrete is cast in place in the column cavity, there is no need to formwork on site, so the construction steps are not increased, the construction efficiency is effectively improved, the construction cost is further reduced, and the connection strength and stability between the columns on different floors are also ensured.

[0018] A composite column construction method includes the following steps, First, pre-install the vertical side steel bars into the column cavity; Hoist the hollow precast column together with the vertical side steel bars to the designed installation position on the concrete floor slab. The lower end of the vertical main steel bar is provided with a grouting sleeve, and the designed installation position is provided with protruding corner connecting steel bars and side connecting steel bars; Second, move the vertical side steel bars downward, and connect the lower ends of the vertical side steel bars to the upper ends of the corresponding side connecting steel bars by welding or mechanical sleeves; Then, lower the hollow precast column, insert the corner connecting steel bars upward into the grouting sleeve until the precast concrete column formwork supports on the upper surface of the concrete floor slab; Third, pour concrete into the column cavity and grout in the grouting sleeve. In the construction method of the composite column of this scheme, only the vertical main steel bars are connected by the grouting sleeve technology, and the rest of the vertical side steel bars are all connected by welding or mechanical sleeves. Therefore, the number of vertical steel bars connected by the grouting sleeve technology is effectively reduced, thus effectively improving the situation that it is easy to have the problem that the steel bars and the grouting sleeves cannot be fully aligned due to too many vertical steel bars in the same precast column using the grouting sleeve technology, enabling the precast column to be installed smoothly; at the same time, when pouring concrete on-site in the column cavity, there is no need for on-site formwork support, so the construction steps will not be increased, the construction efficiency is effectively improved, the construction cost is further reduced, and the connection strength and stability between columns on different floors are also ensured.

[0019] The beneficial effects of the present invention are: it can not only greatly reduce the lifting weight of the precast column, facilitating on-site hoisting construction and reducing the construction cost; but also can effectively reduce the number of vertical steel bars connected by the grouting sleeve technology without increasing the formwork support process on the construction site, thus effectively improving the problem that the steel bars and the grouting sleeves cannot be aligned, enabling the precast column to be installed smoothly. Description of the Drawings

[0020] Figure 1 It is a structural schematic diagram of a composite column of the present invention (the column cavity in the figure is not filled with concrete).

[0021] Figure 2 It is a cross-sectional schematic diagram of an implementation manner of the composite column of the present invention (the column cavity in the figure has been filled with concrete).

[0022] Figure 3 It is a cross-sectional schematic diagram of another implementation manner of the composite column of the present invention (the column cavity in the figure has been filled with concrete).

[0023] Figure 4 It is a schematic diagram of the construction and installation process of the composite column of the present invention.

[0024] Figure 5 It is a partial structural schematic diagram of the application structure of the composite column in the present invention.

[0025] In the figure: Hollow precast column 1, precast concrete column formwork 1.1, formwork stiffening structure 1.11, precast column steel reinforcement cage 1.2, vertical main reinforcement 1.21, stirrup 1.22, grouting sleeve 1.23, column cavity 1.3; On-site composite structure 2, vertical side reinforcement 2.1, side reinforcement positioner 2.2, welded connection joint 2.3; Lower layer structural column 3, corner connection reinforcement 3.1, side connection reinforcement 3.2; Upper layer structural column 4; Concrete floor slab 5. Specific implementation method

[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods: Specific embodiment 1, as Figure 1 、 Figure 2 shown, a composite column includes a hollow precast column 1 and an on-site composite structure 2.

[0027] The hollow precast column 1 is the factory precast part. The hollow precast column 1 includes a precast concrete column formwork 1.1 and a precast column steel reinforcement cage 1.2 that are cast integrally. There is a column cavity 1.3 that runs through from top to bottom inside the precast concrete column formwork 1.1; specifically, the precast concrete column formwork 1.1 is formed by casting in the factory, and is formed by bonding and wrapping a concrete mixture around the precast column steel reinforcement cage 1.2 and then hardening. The precast concrete column formwork 1.1 and the precast column steel reinforcement cage 1.2 are cast and connected into one body, and a column cavity 1.3 is formed inside the precast concrete column formwork 1.1. The precast column steel reinforcement cage 1.2 includes vertical main reinforcement 1.21. A grouting sleeve 1.23 is provided at the lower end of the vertical main reinforcement 1.21. The grouting sleeve 1.23 and the vertical main reinforcement 1.21 are coaxially distributed, and the lower end of the grouting sleeve 1.23 is flush with or higher than the lower end of the precast concrete column formwork 1.1. The outer shape of the cross-section of the precast concrete column formwork 1.1 is circular or polygonal.

[0028] In one example, the outer shape of the cross-section of the precast concrete column formwork 1.1 is square. The vertical main reinforcement 1.21 is 2 - 4 pieces. Figure 2 As Figure 3 shown, the vertical main reinforcement 1.21 is 4 pieces, and the vertical main reinforcement 1.21 is arranged at the four corner positions of the precast concrete column formwork 1.1. Of course, it should be noted that the number and arrangement position of the vertical main reinforcement 1.21 can be designed according to needs. For example, the vertical main reinforcement 1.21 is 4 pieces, and one vertical main reinforcement 1.21 is arranged in the middle of each of the four sides of the precast concrete column formwork 1.1; another example is that the vertical main reinforcement 1.21 is 2 pieces, and one vertical main reinforcement 1.21 is arranged at each diagonal of the precast concrete column formwork 1.1.

[0029] In another example, the outer shape of the cross-section of the precast concrete column formwork 1.1 is circular. There are 2 - 6 vertical main steel bars 1.21, and each vertical main steel bar 1.21 is evenly distributed around the circumference of the precast concrete column formwork 1.1.

[0030] Of course, it should be noted that the outer shape of the cross-section of the precast concrete column formwork 1.1 can also be set to other shapes according to actual needs.

[0031] The on-site composite structure 2 includes several vertical side steel bars 2.1 located in the column cavity 1.3 and the concrete that is cast in place and fills the column cavity 1.3 in the column cavity 1.3. In this embodiment, the length direction of the vertical main steel bars 1.21 is parallel to the height direction of the hollow precast column 1. The length direction of the vertical side steel bars 2.1 is parallel to the height direction of the hollow precast column 1.

[0032] Before the concrete is cast in place in the column cavity 1.3, each vertical side steel bar 2.1 can move along the height direction of the hollow precast column 1. After the concrete cast in place in the column cavity 1.3 hardens, the on-site composite structure 2 and the hollow precast column 1 together form a composite column and bear the load together.

[0033] During the actual installation and construction of the composite column in this embodiment, the parts that need to be lifted are the hollow precast column 1 and the vertical side steel bars 2.1. After the hollow precast column 1 and the vertical side steel bars 2.1 are installed and constructed, concrete is then cast in place into the column cavity 1.3 of the hollow precast column 1. In this way, the lifting weight of the hollow precast column 1 can be greatly reduced, and the tower crane model on the construction site can be reduced, so as to facilitate the on-site hoisting construction.

[0034] During the actual installation and construction of the composite column in this embodiment, as Figure 4 shown, when the hollow precast column 1 and the vertical side steel bars 2.1 are hoisted together to the designed installation position of the concrete floor slab 5, enough space is left between the lower end of the precast concrete column formwork 1.1 and the concrete floor slab 5 for the welding or mechanical connection operation of the vertical side steel bars 2.1; Next, as Figure 4 shown, the vertical side steel bars 2.1 are moved downward, and then the connection of each vertical side steel bar 2.1 is realized through welding or mechanical sleeves; specifically, the lower end of the vertical side steel bar 2.1 of the composite column is connected to the upper end of the vertical side steel bar 2.1 of the lower - layer structural column 3 through welding or mechanical sleeves; Then, as Figure 5 shown, the hollow precast column 1 is hoisted downward along the height direction of the hollow precast column 1 to the upper surface of the concrete floor slab 5, and the vertical main steel bars 1.21 are connected through the grouting sleeve technology. The grouting sleeve technology means that the upper end of the vertical main steel bar 1.21 of the lower - layer floor structural column is inserted into the grouting sleeve 1.23, and then grout is injected into the grouting sleeve 1.23 (the grouting sleeve technology is an existing technology); Finally, concrete is directly poured into the column cavity 1.3. After the on-site poured concrete in the column cavity 1.3 hardens, the on-site composite structure 2 and the hollow precast column 1 together form a composite column and bear force jointly. In this way, only the vertical main steel bars in the composite column of this embodiment are connected by grouting sleeves, and the remaining vertical side steel bars 2.1 are all connected by welding or mechanical connection. Therefore, the number of vertical steel bars connected by the grouting sleeve technology is effectively reduced, thus effectively improving the situation that it is easy to have the situation where the steel bars and the grouting sleeve 1.23 cannot be fully aligned due to too many vertical steel bars in the same precast column using the grouting sleeve technology, enabling the precast column to be installed smoothly. At the same time, when pouring concrete on-site in the column cavity 1.3, there is no need for on-site formwork support, so the construction steps will not be increased, the construction efficiency is effectively improved, the construction cost is further reduced, and the connection strength and stability between columns on different floors are also ensured.

[0035] Further, as Figure 1 , Figure 5 shown, the upper end of the vertical main steel bar 1.21 extends above the upper end of the precast concrete column formwork 1.1. After the on-site poured concrete in the column cavity 1.3 hardens, the upper ends of the vertical side steel bars 2.1 extend above the upper end of the precast concrete column formwork 1.1. In this way, the vertical main steel bar 1.21 and the vertical side steel bar 2.1 extending above the precast concrete column formwork 1.1 can pass through the concrete floor slab of the upper floor and serve as the connecting bars at the lower end of the structural column on the upper floor to ensure the smooth connection between the vertical steel bars of the structural columns on different floors.

[0036] Further, as Figure 2 , Figure 3 shown, each vertical side steel bar 2.1 is close to or adjacent to the inner wall of the column cavity 1.3, and each vertical side steel bar 2.1 is distributed in sequence along the edge of the column cavity 1.3. In this way, after the concrete in the column cavity 1.3 cures, it is beneficial to improve the strength and stability of the composite column itself.

[0037] Further, as Figure 1 , Figure 2 , Figure 3 shown, the precast column steel cage 1.2 further includes stirrups 1.22. The stirrups 1.22 are arranged around each vertical main steel bar 1.21. In one example, the stirrups 1.22 of the three-dimensional steel cage adopt a spiral stirrup structure.

[0038] In this embodiment, the maximum thickness of the precast concrete column formwork 1.1 is T, and T = c + d, where c is the steel bar protection layer thickness (the steel bar protection layer thickness in this embodiment is 20 - 50 mm), and d is the diameter of the stirrup 1.22.

[0039] The minimum thickness of the precast concrete column formwork 1.1 is t, and t = c, where c is the thickness of the steel bar protection layer (in this embodiment, the thickness of the steel bar protection layer is 20 - 50 mm).

[0040] Furthermore, the precast concrete column formwork 1.1 is formed by casting concrete. Specifically, the precast concrete column formwork 1.1 is formed by casting high-strength concrete. Of course, the precast concrete column formwork 1.1 can also be formed by casting ordinary concrete.

[0041] Furthermore, the precast concrete column formwork 1.1 is formed by centrifugal casting process in the factory. Of course, the precast concrete column formwork 1.1 can also be formed by ordinary formwork casting method.

[0042] Furthermore, in the on-site composite structure 2, the type of concrete cast and filled in the column cavity 1.3 on-site can be selected according to needs. Specifically, In one example, the concrete cast in the column cavity 1.3 on-site is non-shrink high-strength concrete to improve the structural performance.

[0043] In another example, the concrete cast in the column cavity 1.3 on-site is self-compacting concrete to improve the perfusion compactness.

[0044] Furthermore, the diameters of the vertical main steel bars 1.21 and the vertical side steel bars 2.1 can be selected according to needs. Specifically, In one example, the diameters of the vertical main steel bars 1.21 and the vertical side steel bars 2.1 are different. For example, the diameter of the vertical main steel bar 1.21 is larger than the diameter of the vertical side steel bar 2.1.

[0045] In another example, the diameters of the vertical main steel bars 1.21 and the vertical side steel bars 2.1 are the same.

[0046] Furthermore, the strength grades of the vertical main steel bars 1.21 and the vertical side steel bars 2.1 can be selected according to needs. Specifically, In one example, the strength grades of the vertical main steel bars 1.21 and the vertical side steel bars 2.1 are different. For example, the strength grade of the vertical main steel bar 1.21 is higher than the strength grade of the vertical side steel bar 2.1.

[0047] In another example, the strength grades of the vertical main steel bars 1.21 and the vertical side steel bars 2.1 are the same.

[0048] Furthermore, the vertical main steel bars 1.21 are composed of prestressed steel bars.

[0049] Furthermore, the same vertical main steel bar is composed of one steel bar, or the same vertical main steel bar is composed of a group of parallel bars formed by several steel bars.

[0050] Further, as Figure 1 shown, the composite column further includes side steel bar positioners 2.2 fixed in the column cavity 1.3. The side steel bar positioners 2.2 include a number of vertical guiding holes. In this embodiment, the vertical guiding holes of the same side steel bar positioner 2.2 correspond one-to-one with the vertical side steel bars 2.1. The vertical side steel bars 2.1 are slidably inserted into the corresponding vertical guiding holes. In this way, the side steel bar positioners 2.2 can position and guide each vertical side steel bar 2.1, facilitating actual construction operations; at the same time, during the in-situ pouring of concrete in the column cavity 1.3, the position of the vertical side steel bars 2.1 is ensured to be at the set position, so that after the concrete in the column cavity 1.3 cures, it is beneficial to ensure the strength and stability of the composite column itself.

[0051] In this embodiment, there are at least two side steel bar positioners 2.2, and the side steel bar positioners 2.2 are distributed successively from top to bottom, with one close to the top inside the column cavity 1.3 and one close to the bottom inside the column cavity 1.3. The vertical side steel bars 2.1 are successively inserted into the corresponding vertical guiding holes on each side steel bar positioner 2.2.

[0052] The side steel bar positioners 2.2 are prefabricated parts in the factory and are installed together with the hollow precast column 1 during factory production.

[0053] Specific Embodiment Two, for the rest of the structure of this embodiment, refer to Specific Embodiment One. The difference is that In one implementation manner of this embodiment, as Figure 2 shown, the wall thickness of the precast concrete column formwork 1.1 adopts an equal-thickness structure.

[0054] In another implementation manner of this embodiment, as Figure 3 shown, the wall thickness of the precast concrete column formwork 1.1 adopts an unequal-thickness structure. Specifically, in this implementation manner, the outer shape of the cross-section of the precast concrete column formwork 1.1 is square. There are four vertical main steel bars 1.21, and the vertical main steel bars 1.21 are arranged at the four corner positions of the precast concrete column formwork 1.1. The precast concrete column formwork 1.1 is provided with integrally cast and formed formwork stiffening structures 1.11 at the four corner positions of the column cavity 1.3, and the vertical main steel bars 1.21 are completely or partially covered in the formwork stiffening structures 1.11. In this way, on the one hand, it is beneficial to improve the structural strength of the precast concrete column formwork 1.1, and on the other hand, under the condition of ensuring the structural strength of the precast concrete column formwork 1.1, the wall thickness of the precast concrete column formwork 1.1 can be further reduced, reducing the lifting weight, facilitating on-site lifting construction, and reducing the construction cost.

[0055] Specific Embodiment Three, as Figure 5As shown in the figure, a composite column application structure includes an upper structural column 4, a lower structural column 3, and a concrete floor slab 5 connected between the upper and lower structural columns 3. At least one of the upper structural column 4 and the lower structural column 3 is a composite column. The specific structure of the composite column refers to Specific Embodiment 1 or Specific Embodiment 2.

[0056] Both the upper structural column 4 and the lower structural column 3 include vertical main steel bars 1.21 and vertical side steel bars 2.1. Specifically, both the upper structural column 4 and the lower structural column 3 include steel cages, and the steel cages of the upper structural column 4 and the lower structural column 3 both include vertical main steel bars 1.21 and vertical side steel bars 2.1.

[0057] The upper ends of the vertical main steel bars and vertical side steel bars of the lower structural column all pass through the concrete floor slab and extend a set length above the concrete floor slab. Among them, this part of the vertical main steel bars 1.21 located above the concrete floor slab 5 forms corner connecting steel bars, and this part of the vertical side steel bars 2.1 located above the concrete floor slab 5 forms side connecting steel bars.

[0058] The vertical side steel bars 2.1 between the upper structural column 4 and the lower structural column 3 are connected by welding or mechanical sleeves. Specifically, In one implementation, the lower end of the vertical side steel bar 2.1 of the upper structural column 4 is welded to the upper end of the side connecting steel bar in the corresponding vertical side steel bar 2.1 of the lower structural column 3, and a welded connection joint 2.3 is formed at the lower end of the vertical side steel bar 2.1 and the upper end of the side connecting steel bar.

[0059] In another implementation, the lower end of the vertical side steel bar 2.1 of the upper structural column 4 is connected to the upper end of the side connecting steel bar in the corresponding vertical side steel bar 2.1 of the lower structural column 3 by a mechanical sleeve. Specifically, In one example, the mechanical sleeve is a threaded sleeve. The upper and lower ends of the vertical side steel bars 2.1 of the upper structural column 4 and the lower structural column 3 both have threads, and the upper end of the side connecting steel bar has threads. The lower end of the vertical side steel bar 2.1 of the upper structural column 4 is connected to the upper end of the corresponding side connecting steel bar by a threaded sleeve.

[0060] In another example, the mechanical sleeve is an extrusion sleeve. The lower end of the vertical side steel bar 2.1 of the upper structural column 4 and the upper end of the corresponding side connecting steel bar are both inserted into the extrusion sleeve, and the lower end of the vertical side steel bar 2.1 of the upper structural column 4 is connected to the upper end of the corresponding side connecting steel bar by deforming the extrusion sleeve by compression.

[0061] In this embodiment, the vertical side steel bars 2.1 between the upper and lower structural columns 3 correspond one by one, that is, the vertical side steel bars 2.1 between the upper structural column 4 and the lower structural column 3 correspond one by one. Of course, it should be noted that the number of vertical side steel bars 2.1 of the upper structural column 4 and the number of vertical side steel bars 2.1 of the lower structural column 3 may also be different.

[0062] The vertical main reinforcement bars 1.21 between the upper-story structural column 4 and the lower-story structural column 3 are connected by the grouting sleeve technology. Specifically, a grouting sleeve 1.23 is provided at the lower end of the vertical main reinforcement bar 1.21 of the upper-story structural column 4, and the corner connection reinforcement bars in the vertical main reinforcement bars 1.21 of the lower-story structural column 3 are inserted into the grouting sleeve 1.23 of the upper-story structural column 4 one by one, and then grout is injected into the grouting sleeve 1.23 (the grouting sleeve technology is an existing technology).

[0063] In this embodiment, the vertical main reinforcement bars 1.21 between the upper and lower structural columns 3 correspond one by one, that is, the vertical main reinforcement bars 1.21 between the upper-story structural column 4 and the lower-story structural column 3 correspond one by one. Of course, it should be noted that the number of vertical main reinforcement bars 2.1 of the upper-story structural column 4 and the number of vertical main reinforcement bars 2.1 of the lower-story structural column 3 may also be different.

[0064] In one implementation manner of this embodiment, both the upper-story structural column 4 and the lower-story structural column 3 are composite columns.

[0065] In the second implementation manner of this embodiment, the upper-story structural column 4 is a composite column, and the lower-story structural column 3 can be selected as a cast-in-place structural column or a precast structural column according to needs. Specifically, In one example, the lower-story structural column 3 is a reinforced concrete cast-in-place structural column.

[0066] In another example, the lower-story structural column 3 is a solid precast reinforced concrete structural column.

[0067] In the third example, the lower-story structural column 3 includes a hollow precast reinforced concrete structural column prefabricated integrally in the factory and cast-in-place concrete poured into the hollow inner cavity of the hollow precast reinforced concrete structural column. The steel reinforcement cage and the concrete of the hollow precast reinforced concrete structural column are cast integrally in the factory.

[0068] In the third implementation manner of this embodiment, the lower-story structural column 3 is a composite column, and the upper-story structural column 4 can be selected as a cast-in-place structural column or a precast structural column according to needs. Specifically, In one example, the upper-story structural column 4 is a reinforced concrete cast-in-place structural column.

[0069] In another example, the upper-story structural column 4 is a solid precast reinforced concrete structural column.

[0070] In the third example, the upper-story structural column 4 includes a hollow precast reinforced concrete structural column prefabricated integrally in the factory and cast-in-place concrete poured into the hollow inner cavity of the hollow precast reinforced concrete structural column. The steel reinforcement cage and the concrete of the hollow precast reinforced concrete structural column are cast integrally in the factory.

[0071] In the application structure of the composite column of this embodiment, at least one of the upper structural column 4 and the lower structural column 3 is a composite column. During the specific installation and construction of the composite column, the parts that need to be lifted are the hollow precast column 1 and the vertical side steel bars 2.1. Therefore, the lifting weight of the hollow precast column 1 can be greatly reduced, and the tower crane model on the construction site can be reduced, so as to facilitate the on-site hoisting construction. At the same time, only the vertical main steel bars 1.21 between the upper structural column 4 and the lower structural column 3 are connected through the grouting sleeve structure, and the vertical side steel bars 2.1 between the upper structural column 4 and the lower structural column 3 are connected by welding or mechanical sleeves. Therefore, the number of vertical steel bars connected by the grouting sleeve technology is effectively reduced, thus effectively improving the problem that the steel bars and the grouting sleeve 1.23 cannot be aligned, so that the precast column can be installed smoothly. In addition, when pouring concrete on-site in the column cavity 1.3 of the upper structural column 4, there is no need for on-site formwork support, which effectively improves the construction efficiency, further reduces the construction cost, and also ensures the connection strength and stability between the columns on different floors.

[0072] Specific embodiment four, a construction method of a composite column. The specific structure of the composite column in this construction method refers to specific embodiment one or specific embodiment two.

[0073] A construction method of a composite column includes the following steps. First, pre-install the vertical side steel bars 2.1 into the column cavity 1.3.

[0074] Lift the hollow precast column 1 and the vertical side steel bars 2.1 together to the designed installation position of the concrete floor slab 5, and make the hollow precast column 1 and the vertical side steel bars 2.1 in a vertical state. Before the on-site hoisting of the vertical side steel bars 2.1 in the on-site composite part, they are pre-installed into the column cavity 1.3 of the hollow precast column 1 and hoisted together with the hollow precast column 1, which can improve the construction efficiency.

[0075] As Figure 4 shown, the designed installation position of the concrete floor slab 5 is provided with protruding corner connecting steel bars 3.1 and side connecting steel bars 3.2; specifically, there is a lower structural column 3 below the designed installation position of the concrete floor slab 5, and the specific structure and method of the lower structural column 3 refer to specific embodiment three. The upper ends of the vertical main steel bars 1.21 and the vertical side steel bars 2.1 in the lower structural column 3 both pass through the concrete floor slab 5 and are located above the concrete floor slab 5. Among them, this part of the vertical main steel bars 1.21 located above the concrete floor slab 5 forms corner connecting steel bars, and this part of the vertical side steel bars 2.1 located above the concrete floor slab 5 forms side connecting steel bars.

[0076] As Figure 4 shown, when the hollow precast column 1 and the vertical side steel bars 2.1 are lifted together to the designed installation position of the concrete floor slab 5, there is an operating space between the lower end of the precast concrete column formwork 1.1 and the concrete floor slab 5, leaving enough operating space for the welding or mechanical connection of the vertical side steel bars.

[0077] Second, as Figure 4 shown, move the vertical side reinforcement 2.1 downward, and connect the lower end of the vertical side reinforcement 2.1 to the upper end of the corresponding side connecting reinforcement by welding or mechanical sleeve connection (for the specific structure of connecting the lower end of the vertical side reinforcement to the upper end of the corresponding side connecting reinforcement by mechanical sleeve connection, refer to the specific embodiment three).

[0078] Next, as Figure 5 shown, lift the hollow precast column 1 downward, insert the corner connecting reinforcement upward into the grouting sleeve 1.23 until the precast concrete column formwork 1.1 supports on the upper surface of the concrete floor slab 5.

[0079] Third, pour concrete into the column cavity 1.3. Inject grout into the grouting sleeve 1.23, such as high-strength grouting material. After the concrete poured on-site in the column cavity 1.3 hardens, the on-site composite structure 2 and the hollow precast column 1 together form a composite column and bear the load together.

[0080] In the construction method of the composite column of this embodiment, the parts that need to be lifted are the hollow precast column 1 and the vertical side reinforcement 2.1. After the hollow precast column 1 and the vertical side reinforcement 2.1 are installed and constructed, then pour concrete on-site into the column cavity 1.3 of the hollow precast column 1. In this way, the lifting weight of the hollow precast column 1 can be greatly reduced, the tower crane model on the construction site can be reduced, so as to facilitate the on-site hoisting construction, and the construction cost can be reduced.

[0081] In the construction method of the composite column of this embodiment, only the vertical main reinforcement is connected by the grouting sleeve technology, and the remaining vertical side reinforcements 2.1 are all connected by welding or mechanical sleeve connection. Therefore, the number of vertical reinforcements connected by the grouting sleeve technology is effectively reduced, and thus the situation that it is easy to have the problem that the reinforcements and the grouting sleeve 1.23 cannot be fully aligned due to too many vertical reinforcements in the same precast column is effectively improved, enabling the precast column to be smoothly installed; at the same time, when pouring concrete on-site in the column cavity 1.3, there is no need to formwork on-site, so the construction steps will not be increased, the construction efficiency is effectively improved, the construction cost is further reduced, and the connection strength and stability between columns on different floors are also ensured.

[0082] The above are only the preferred embodiments of the present invention, and do not impose any limitations on the present invention. Any simple modifications, changes, and equivalent transformations made to the above embodiments according to the technical essence of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A composite column, characterized in that: include: A hollow prefabricated column (1) comprises a prefabricated concrete column form (1.1) and a prefabricated column reinforcement cage (1.2) cast in one piece, wherein the prefabricated concrete column form (1.1) has a column cavity (1.3) that passes through from top to bottom, and the prefabricated column reinforcement cage (1.2) comprises vertical main reinforcements (1.21); The on-site composite structure (2) comprises a plurality of vertical side steel bars (2.1) located in a column cavity (1.3) and concrete poured on-site in the column cavity (1.3) to fill the column cavity (1.3); before the concrete is poured on-site in the column cavity (1.3), each vertical side steel bar (2.1) can move along the height direction of the hollow prefabricated column (1); after the concrete poured on-site in the column cavity hardens, the on-site composite structure and the hollow prefabricated column form a composite column.

2. The composite column according to claim 1, characterized in that: It also includes a side steel bar positioner (2.2) fixed in the column cavity (1.3), the side steel bar positioner (2.2) including a plurality of vertical guide holes, and the vertical side steel bars (2.1) can be slidably inserted in the vertical guide holes.

3. The composite column according to claim 1, characterized in that: The cross-sectional outer shape of the precast concrete column formwork (1.1) is square, and the number of vertical main steel bars (1.21) is 2-4.

4. The composite column according to claim 3, characterized in that: A formwork reinforcement structure (1.11) corresponding to the vertical main steel bars (1.21) is provided on the inner wall of the column inner cavity (1.3); the formwork reinforcement structure (1.11) and the precast concrete column formwork (1.1) are integrally cast and formed, and the vertical main steel bars (1.21) are completely or partially covered in the formwork reinforcement structure (1.11).

5. The composite column according to claim 1, 2, 3 or 4, characterized in that: The precast column reinforcement cage (1.2) further comprises stirrups, and the maximum thickness of the precast concrete column formwork (1.1) is T, T=c+d, wherein c is the thickness of the reinforcement protective layer, and d is the diameter of the stirrups; The minimum thickness of the precast concrete column formwork (1.1) is t, t=c, where c is the thickness of the reinforcement cover.

6. The composite column according to claim 1, 2, 3 or 4, characterized in that: The upper ends of the vertical main reinforcements (1.21) extend above the upper end of the precast concrete column formwork (1.1), and after the concrete poured on site in the column cavity (1.3) hardens, the upper ends of the vertical side reinforcements (2.1) extend above the upper end of the precast concrete column formwork (1.1).

7. The composite column according to claim 1, 2, 3 or 4, characterized in that: A grouting sleeve is provided at the lower end of the vertical main steel bar (1.21).

8. The composite column according to claim 1, 2, 3 or 4, characterized in that: Each vertical side steel bar (2.1) is close to or closely adjacent to the inner wall of the column cavity (1.3), and each vertical side steel bar (2.1) is distributed in sequence along the edge of the column cavity (1.3).

9. An application structure of the composite column according to any one of claims 1 to 8, characterized in that: It comprises an upper structural column (4), a lower structural column (3) and a concrete floor slab (5) connected between the upper and lower structural columns, wherein at least one of the upper and lower structural columns is a composite column; The upper and lower structural columns both include vertical main steel bars (1.21) and vertical side steel bars (2.1), and the upper ends of the vertical main steel bars (1.21) and the vertical side steel bars (2.1) of the lower structural column both pass through the concrete floor slab (5) and extend out of the concrete floor slab (5) by a set length; The vertical main reinforcement (1.21) between the upper structure column (4) and the lower structure column (3) is connected by a grouting sleeve, and the vertical side reinforcement (2.1) between the upper structure column and the lower structure column is connected by welding or mechanical sleeves.

10. A construction method for a composite column according to any one of claims 1 to 8, characterized in that: The following steps are included: First, pre-install the vertical edge reinforcement into the column cavity; The hollow prefabricated column and the vertical side reinforcement are hoisted together to the designed installation position of the concrete floor slab, a grouting sleeve is provided at the lower end of the vertical main reinforcement, and the designed installation position is provided with extended corner connecting reinforcement and side connecting reinforcement; Second, move the vertical side reinforcement downwards and connect the lower end of the vertical side reinforcement to the upper end of the corresponding side connecting reinforcement by welding or mechanical sleeve; Next, the hollow precast column is lowered so that the corner connecting steel bars are inserted upward into the grouting sleeve until the precast concrete column formwork is supported on the upper surface of the concrete floor; Third, pour concrete in the column cavity and inject grout into the grouting sleeve.

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