Hollow sandwich prefabricated column and forming method thereof

Abstract

The invention provides a hollow sandwich prefabricated column and a forming method thereof, and belongs to the field of prefabricated structural columns. The hollow sandwich prefabricated column structurally comprises an inner core column, an outer mold shell, structural ribs and tie pieces; wherein the outer mold shell is arranged on the inner core column in a surrounding manner, and a post-pouring laminated layer is formed between the outer mold shell and the inner core column in a clamping manner; the structural ribs are arranged in the post-cast laminated layer and surround the inner core column; and the tie piece is tied to the outer mold shell. According to the scheme, the structural ribs are installed on the outer side of the inner core column and then the laminated layer is poured, the connecting length of an existing cast-in-place standard is met, cast-in-place is equivalent, and it is guaranteed that vertical connection is safe and reliable; the inner core column is more convenient to prefabricate without convex steel bars, the butt joint installation of structural bars is more convenient, and the problems of inaccurate alignment, insufficient grouting, steel bar shearing and difficult detection of a grouting sleeve prefabricated column are thoroughly solved; and the pulling pieces are pulled on the outer mold shell to form a space three-dimensional stress system, so that the stability is improved, and the anti-cracking performance is good.

Description

Technical Field

[0001] The present invention belongs to the field of precast structural columns, and particularly relates to a hollow sandwich precast column and a forming method thereof. Background Art

[0002] In the existing field of structural columns in the field of prefabricated buildings, it generally includes precast columns, formwork columns, inner composite columns, etc.

[0003] Precast columns are generally prefabricated in factories and connected by grouting sleeves installed on site. Taking the practice in the national standard atlas "Connection Joint Structure of Precast Concrete Structures (Frame)" (20G310-3) as an example, grouting sleeves are provided at the bottom of the precast column and connected by grouting after inserting with the main reinforcement. However, the grouting sleeves of precast columns have problems such as misalignment and incomplete filling, resulting in difficult construction. Moreover, the components are relatively heavy, making hoisting difficult on the construction site, and the costs of factory production and construction site construction are too high.

[0004] Formwork columns are formed by enclosing with formwork to form a casting cavity, and then the main reinforcement is arranged in the cavity and cast. This structure is prone to formwork bulging due to the large internal cavity.

[0005] Inner composite columns are precast with a precast concrete pipe with a hollow interior, and then internally cast. This method has difficulties in docking and positioning during installation because the main reinforcement of the upper and lower columns needs to be connected by mechanical joints, resulting in construction difficulties.

[0006] In the prior art, there is also a practice of outer composite columns. In an outer composite precast column and a column structure including the outer composite precast column described in Chinese Patent CN218970431U, the column main reinforcement is connected to the cast-in-place layer on the outside of the precast column. Although the vertical connection can be ensured to be safe and reliable, due to the stirrups protruding from all four sides, it forms a special-shaped structure of the precast column, which is extremely inconvenient for both horizontal casting and vertical casting in factory prefabrication, resulting in high forming costs and difficulties; moreover, the outer formwork is separated from the precast column, and is prone to loosening, deformation, formwork bulging, and falling off.

[0007] Then how to achieve the convenience of prefabrication and installation of precast columns is an urgent problem to be solved by the present invention.

[0008] It should be noted that the information disclosed in the background art part of this invention is only intended to deepen the understanding of the general background art of the present invention, and should not be regarded as an admission or any form of suggestion that this information constitutes the prior art known to those skilled in the art. Summary of the Invention

[0009] The purpose of the present invention is to propose a precast column structure that is convenient for prefabrication and installation.

[0010] To achieve the above-mentioned purpose, the present invention first provides a hollow sandwich precast column, including: Inner core column; Outer formwork shell, the outer formwork shell surrounds the inner core column, and a post-cast composite layer is formed by sandwiching between the outer formwork shell and the inner core column; Structural reinforcement bars, the structural reinforcement bars are arranged in the post-cast composite layer and surround the inner core column; Lacing members, the lacing members are laced to the outer formwork shell.

[0011] Preferably, there are at least two groups of the lacing members, the two groups of lacing members are respectively arranged along a first direction and a second direction, and the first direction and the second direction are perpendicular to each other.

[0012] Preferably, the lacing member penetrates through the inner core column and is in tension between the two sides of the outer formwork shell.

[0013] Preferably, the lacing member is a tie rod, a through hole is provided in a penetrating manner on the side of the inner core column, and the tie rod penetrates through the through hole and is respectively laced to the outer formwork shell at both ends.

[0014] Preferably, the lacing member is laced to the inner core column and the outer formwork shell.

[0015] Preferably, the lacing member is a lacing bar, a pre-embedded threaded sleeve is provided on the side of the inner core column, both ends of the lacing bar have threaded sections, one end of the lacing bar facing the inner core column is threadedly connected to the pre-embedded threaded sleeve, and the other end is laced to the outer formwork shell.

[0016] Preferably, a clamping assembly is provided at one end of the lacing member where it is laced to the outer formwork shell, the clamping assembly includes an inner adjusting member and an outer adjusting member, the inner adjusting member and the outer adjusting member are respectively located on the inner and outer sides of the outer formwork shell and are threadedly sleeved on the lacing member, and the inner adjusting member and the outer adjusting member clamp and position the outer formwork shell.

[0017] Preferably, the outer formwork shell includes four outer formwork plates that enclose on four sides, and the lacing member is laced to the outer formwork plates.

[0018] Preferably, the structural reinforcement bars at least include column main reinforcement bars and column stirrups; multiple column main reinforcement bars are located in the post-cast composite layer and close to the corner positions on the inner side of the outer formwork shell, the column stirrups are hooped on multiple column main reinforcement bars; the column stirrups are sleeved on the inner core column.

[0019] Preferably, positioning angle steels are provided at the inner corners of the outer formwork shell.

[0020] Preferably, an outer formwork strengthening member is further provided on the outer side of the outer formwork shell, and the outer formwork strengthening member is laced and installed on the outer side surface of the outer formwork shell by the lacing member.

[0021] The technical effects produced by the above technical solutions of the present invention come from one or more of the following combinations: By installing structural bars on the outer side of the inner core column in the post-cast composite layer, the connection length meeting the existing in-situ construction specifications is achieved, which is equivalent to in-situ casting, ensuring the safety and reliability of vertical connections. Moreover, the prefabrication of the inner core column without protruding outer steel bars is more convenient, and the butt joint installation of the structural bars is more convenient, completely solving the problems of misalignment, incomplete filling, cutting of steel bars, and difficult detection of grouting sleeves in precast shear walls. Furthermore, the tie members are tied to the outer formwork to form a three-dimensional stress system, increasing stability and having good crack resistance performance.

[0022] Wire ducts and pipelines can be embedded in the in-situ casting layer, reducing the production difficulty in the factory and improving the factory production efficiency.

[0023] The tie members can penetrate the inner core column and perform limiting tie of the inner core column in the vertical and horizontal directions, or can perform single-sided and multi-directional tie through embedded threaded sleeves; the structural form is convenient and the construction is convenient.

[0024] The inner adjusting member and the outer adjusting member of the clamping assembly clamp and position the outer formwork, facilitating the positioning and stability of the outer formwork, which is not prone to dislocation before pouring and can prevent formwork bulging during pouring.

[0025] An outer formwork strengthening member is provided on the outer side surface of the outer formwork to strengthen the plate surface structure of the outer formwork and further prevent formwork bulging and displacement.

[0026] The present invention also provides a forming method for a hollow sandwich precast column, comprising the following steps: Precast the inner core column; Arrange the structural bars and surround the inner core column with the structural bars; Arrange the outer formwork, surround the inner core column and the structural bars with the outer formwork, and tie and fix it to the inner core column, and place the structural bars in the post-cast composite layer formed by being clamped between the outer formwork and the inner core column.

[0027] The technical effects generated by the above technical solutions of the present invention come from one or more of the following combinations: By installing structural bars on the outer side of the inner core column in the post-cast composite layer, the connection length meeting the existing in-situ construction specifications is achieved, which is equivalent to in-situ casting, ensuring the safety and reliability of vertical connections. Moreover, the prefabrication of the inner core column without protruding outer steel bars is more convenient, and the butt joint installation of the structural bars is more convenient, completely solving the problems of misalignment, incomplete filling, cutting of steel bars, and difficult detection of grouting sleeves in precast shear walls. Furthermore, the tie members are tied to the outer formwork to form a three-dimensional stress system, increasing stability and having good crack resistance performance. Description of the Drawings

[0028] Figure 1 It shows the structural schematic diagram of the hollow sandwich precast column of the present invention.

[0029] Figure 2Shows a structural top view of the hollow sandwich precast column of the present invention.

[0030] Figure 3 Shows another structural top view of the hollow sandwich precast column of the present invention.

[0031] Figure 4 Shows a schematic structural view of the inner core column of the present invention.

[0032] Figure 5 Shows the layout structure diagram of the outer mold reinforcement of the hollow sandwich precast column of the present invention.

[0033] Figure 6 Shows the layout top view of the outer mold reinforcement of the hollow sandwich precast column of the present invention.

[0034] Wherein: 1, inner core column; 10, shear key; 11, through hole; 2, outer mold shell; 20, counterbore; 21, outer formwork; 3, structural reinforcement; 31, column main reinforcement; 32, column stirrup; 321, first column stirrup; 322, second column stirrup; 4, tie member; 4a, tie rod; 41, outer adjuster; 42, inner adjuster; 5, positioning angle steel; 6, post-cast composite layer; 7, embedded threaded sleeve. Detailed implementation mode

[0035] The following description is given to enable those skilled in the art to implement and use the present invention and incorporate it into a specific application background. Various variations and various uses in different applications will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to a wide range of embodiments. Thus, the present invention is not limited to the embodiments given herein, but should be accorded the broadest scope consistent with the principles and novel features disclosed herein.

[0036] In the following detailed description, numerous specific details are set forth to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the practice of the present invention may not necessarily be limited to these specific details. In other words, well-known structures and devices are shown in block diagram form without detailed display to avoid obscuring the present invention.

[0037] Readers are cautioned to consider all documents and literature that are filed simultaneously with this specification and are open to public inspection of this specification, and the contents of all such documents and literature are incorporated herein by reference. Unless otherwise directly stated, all features disclosed in this specification (including any appended claims, abstract, and drawings) may be replaced by alternative features serving the same, equivalent, or similar purpose. Thus, unless otherwise clearly stated, each feature disclosed is only one example of a group of equivalent or similar features.

[0038] Note that, when used, the terms "left", "right", "front", "rear", "top", "bottom", "front side", "back side", "clockwise" and "counterclockwise" are used merely for convenience and do not imply any specific fixed directions. In fact, they are used to reflect the relative positions and / or orientations between various parts of an object. In addition, the terms "first" and "second" are used only for descriptive purposes and should not be construed as indicating or implying relative importance.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and defined, the terms "mounted", "connected" and "coupled" should be understood in a broad sense. For example, they can be fixedly connected, detachably connected or integrally connected; they can be mechanically connected; they can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] Note that, when used, "furthermore", "preferably", "moreover" and "even more preferably" are merely the starting points for elaborating another embodiment based on the foregoing embodiments. The content following the "furthermore", "preferably", "moreover" or "even more preferably" in combination with the foregoing embodiments constitutes the complete composition of another embodiment. The combinations among several "furthermore", "preferably", "moreover" or "even more preferably" following the same embodiment can form another embodiment arbitrarily.

[0041] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Note that the aspects described below in conjunction with the accompanying drawings and specific embodiments are merely exemplary and should not be construed as imposing any limitation on the protection scope of the present invention.

[0042] Structural Embodiment: Please refer to Figures 1 to 6 , this embodiment provides a hollow sandwich precast column, including an inner core column 1, an outer formwork 2, structural reinforcement bars 3 and tie members 4. Specifically, the outer formwork 2 surrounds the inner core column 1, and a post-cast composite layer 6 is formed between the outer formwork 2 and the inner core column 1; the structural reinforcement bars 3 are arranged in the post-cast composite layer 6 and surround the inner core column 1; the tie members 4 are tied to the outer formwork 2. By installing the structural reinforcement bars 3 in the outer post-cast composite layer 6 of the inner core column 1, the connection length required by the existing in-situ construction specifications is satisfied, which is equivalent to in-situ casting, ensuring the safety and reliability of vertical connections; and the prefabrication of the inner core column 1 without protruding external steel bars is more convenient, and the butt joint installation of the structural reinforcement bars 3 is more convenient, completely solving the problems of misalignment, insufficient filling, cutting of steel bars and difficult detection of grouting sleeve precast columns; moreover, the tie members 4 are tied to the outer formwork 2 to form a spatial three-dimensional stress system, increasing stability and having good crack resistance.

[0043] The above technical solutions are necessary for the implementation of this embodiment, and the following will be described in detail with reference to the accompanying drawings: Please refer toFigure 1 , Figure 4 and Figure 5 , in this embodiment, the inner core column 1 is a prefabricated concrete structural column formed in a factory, and its shape is not limited. In this embodiment, as a preferred embodiment, it is implemented as a square concrete column, but it can also be implemented as a cylindrical structure or the like. Further, a groove is provided in the inner core column 1 to form a shear key 10 with the post-cast composite layer 6.

[0044] Please refer to Figure 1 , the outer formwork 2 is formed by enclosing a plurality of outer formboards 21, and it can be removed or non-removed after the pouring of the post-cast composite layer 6. When non-removable is adopted, its material is preferably a high-performance concrete board or a fiber concrete board; when post-removable is adopted, common wooden formboards or metal formboards can be used. The hollow sandwich precast column of this embodiment is implemented as a square column. Although the square column is not the only structural limitation of this embodiment, this embodiment is described with the square column as the best embodiment. For this reason, the number of the outer formboards 21 is preferably four, and they enclose each other to form the outer formwork 2. In order to maintain stable positioning, positioning angle steels 5 are provided at the inner corners of the outer formwork 2 for installation and positioning.

[0045] Please refer to Figure 1 , Figure 2 , the structural reinforcement 3 in this embodiment at least includes column main reinforcements 31 and column stirrups 32. The quantities of the two are not limited, and there is no direct connection with the inner core column 1. Instead, through the tie members 4 and the post-cast composite layer 6, the inner core column 1, the post-cast composite layer 6 and the outer formwork 2 are connected as a whole. Taking the steel bar cage of a common steel-concrete structure as an example, multiple column main reinforcements 31 are arranged at least at the four corners, and multiple stirrups are arranged at intervals along the length direction of the column main reinforcements 31. The density of the stirrups is set according to the bending resistance requirements of the steel-concrete structure, and no specific limitation is made here. The structural reinforcement 3 formed by the column main reinforcements 31 and the column stirrups 32 is arranged in the post-cast composite layer 6 and surrounds the inner core column 1.

[0046] Specifically, as a preferred embodiment of this embodiment, multiple column main reinforcements 31 are located in the post-cast composite layer 6 and close to the corner positions on the inner side of the outer formwork 2, and the column stirrups 32 are hooped on the multiple column main reinforcements 31; the column stirrups 32 are sleeved on the inner core column 1. Further, the column stirrups 32 are divided into first column stirrups 321 of the first structural form and second column stirrups 322 of the second structural form. Taking two first column stirrups 321 and one second column stirrups 322 as a layer of stirrup structure, they are hooped on the multiple column main reinforcements 31 in layers.

[0047] Correspondingly, as a preferred embodiment of the first embodiment of the present invention, in this embodiment, the number of the main column reinforcing bars 31 is 12, which are distinguished as four corner column main reinforcing bars 31 located at the four corner positions in the post-cast composite layer 6 and eight side column main reinforcing bars 31 located at the four side positions in the post-cast composite layer 6, with two side column main reinforcing bars 31 provided on each side. Further, the above-mentioned first column stirrup 321 is strip-shaped, and the second column stirrup 322 is square. The second column stirrups 322 of each layer of stirrup structure are sleeved on the four corner column main reinforcing bars 31; and the two second column stirrups 322 of each layer of stirrup structure are respectively sleeved on the four side column main reinforcing bars 31 at the opposite side positions. The position of the inner core column 1 is preferably implemented at the center position of the steel reinforcement cage formed by the main column reinforcing bars 31 and the column stirrups 32.

[0048] In this embodiment, two implementation manners of the tie member 4 are exemplified: 1. Please refer to Figure 2 , Figure 6 . The tie member 4 penetrates through the inner core column 1 and is in tension on both sides of the outer formwork 2. In this regard, the tie member 4 is preferably a tie rod, and a through hole 11 is provided in the side part of the inner core column 1 in a penetrating manner. The tie rod penetrates through the through hole 11 and the two ends are respectively tied to the outer formwork 2. Further, there are at least two groups of the tie members 4, and the two groups of tie members 4 are respectively arranged along a first direction and a second direction, and the first direction and the second direction are perpendicular to each other; furthermore, each group of tie members 4 includes multiple rows arranged in layers along the height direction of the hollow sandwich precast column, and each row includes two tie rods. This is taken as a preferred embodiment and does not form the only limitation of this embodiment. By arranging vertically and horizontally in the first direction and the second direction, the position of the inner core column 1 in the first direction and the second direction is restricted, playing a role of positioning and stabilizing.

[0049] 2. Please refer to Figure 3 . The tie member 4 is tied between the inner core column 1 and the outer formwork 2. In this regard, the tie member 4 is preferably a tie rod 4a, and a pre-embedded threaded sleeve 7 is provided on the side part of the inner core column 1. The two ends of the tie rod 4a have threaded sections. One end of the tie rod 4a facing the inner core column 1 is threadedly connected to the pre-embedded threaded sleeve 7, and the other end is tied to the outer formwork 2. This method forms a single-sided tie, but can be arranged in multiple directions, and can also achieve the tie effect between the outer formwork 2 and the inner core column 1. Further, there are at least four groups of the tie members 4, and the four groups of tie members 4 are respectively arranged along the four sides of the inner core column 1; furthermore, each group of tie members 4 includes multiple rows arranged in layers along the height direction of the hollow sandwich precast column, and each row includes two tie rods 4a. This is taken as a preferred embodiment and does not form the only limitation of this embodiment. By arranging on the four sides, the position of the inner core column 1 is restricted, playing a role of positioning and stabilizing.

[0050] Of the two methods mentioned above, in this embodiment, the anchor 4 is preferably anchored in the same manner as the outer formwork 2. Specifically, the anchor 4 is anchored to one end of the outer formwork 2 and is provided with a clamping assembly, the clamping assembly comprising an inner adjustment member 42 and an outer adjustment member 41, the inner adjustment member 42 and the outer adjustment member 41 are respectively located on the inner and outer sides of the outer formwork 2 and are threadedly sleeved on the anchor 4, the inner adjustment member 42 and the outer adjustment member 41 clamp and position the outer formwork 2. Preferably, the inner adjustment member 42 and the outer adjustment member 41 are both threaded gaskets. When the outer formwork 2 uses a non-disassembly template, a countersunk hole 20 is formed on the outer side of the outer formwork 21, and the outer adjustment member 41 is arranged in the countersunk hole 20 to form a flat surface.

[0051] In order to further improve the rigidity of the outer mold shell 2 and prevent mold expansion, please refer to Figure 5 , Figure 6 , an outer mold reinforcement is also provided on the outer side of the outer mold shell 2, and the outer mold reinforcement is tied and installed on the outer side of the outer mold shell 2 by the tie member 4. Further, the outer mold reinforcement is selected as a reinforcement rib or a reinforcement rod; it can be further preferably a wooden rod or a square steel pipe, etc., a threaded hole is opened on the outer mold reinforcement, and the tie member 4 is tied and attached to the outer side of the outer template 21 to form a board surface reinforcement effect.

[0052] The beneficial effects of this embodiment are: By installing the structural reinforcement 3 on the outside of the inner core column 1 and then pouring the overlapping layer 6, the connection length of the existing cast-in-place specification is met, which is equivalent to cast-in-place, ensuring that the vertical connection is safe and reliable; and the inner core column 1 is more convenient to prefabricate without protruding steel bars, and the docking installation of the structural reinforcement 3 is more convenient, which completely solves the problems of inaccurate alignment of the grouting sleeve prefabricated shear wall, incomplete grouting, steel bar cutting, and difficult detection; and the anchor 4 is tied to the outer formwork 2 to form a spatial three-dimensional force system, which increases stability and has good crack resistance.

[0053] Wire boxes and pipelines can be pre-buried in the cast-in-place layer to reduce factory production difficulty and improve factory production efficiency.

[0054] The anchor 4 can penetrate the inner core column 1 to limit the inner core column 1 in the vertical and horizontal directions, and can also be used for single-sided and multi-directional anchoring through the embedded threaded sleeve 7; the structure is convenient and the construction is convenient.

[0055] The inner adjustment member 42 and the outer adjustment member 41 of the clamping assembly clamp and position the outer formwork shell 2, which facilitates the positioning and stability of the outer formwork shell 2 and is not prone to misalignment before pouring, and can prevent mold expansion during pouring.

[0056] An outer mold reinforcement is provided on the outer side surface of the outer mold shell 2 to strengthen the plate surface structure of the outer mold shell 2 and further prevent the mold from losing its position.

[0057] Method Example: Please combine Figures 1 to 6, this embodiment provides a forming method for a hollow sandwich precast column, which mainly includes the following steps: S1 Precast inner core column 1: Specifically, please refer to Figure 4 and combine with Figure 2 , Figure 3 In this embodiment, the inner core column 1 is a precast concrete structural column in the factory, and its shape is not limited. In this embodiment, as a preferred embodiment, it is implemented as a square concrete column, but it can also be implemented as a cylindrical structure, etc. For the installation method of the later-described tie member 4, the inner core column 1 can be provided with a through hole 11 on the side for the tie to pass through; or, an embedded threaded sleeve 7 can be buried on the side for easy installation. Both are common precast means, and the specific process will not be elaborated here.

[0058] S2 Arrange structural reinforcement bars 3: Specifically, please refer to Figures 1 to 3 In this embodiment, the structural reinforcement bars 3 at least include column main reinforcement bars 31 and column stirrups 32, and the quantity of both is not limited. Taking the steel cage of a common steel-concrete structure as an example, multiple column main reinforcement bars 31 are arranged at least at the four corners, and multiple stirrups are arranged at intervals along the length direction of the column main reinforcement bars 31. The density of the stirrups is set according to the bending resistance requirements of the steel-concrete structure, and no specific limitation is made here. The structural reinforcement bars 3 formed by the column main reinforcement bars 31 and the column stirrups 32 are arranged in the post-cast composite layer 6 and surround the inner core column 1.

[0059] Specifically, as a preferred embodiment of this embodiment, multiple column main reinforcement bars 31 are located in the post-cast composite layer 6 and close to the corner positions on the inner side of the outer formwork 2, and the column stirrups 32 are hoop-mounted on multiple column main reinforcement bars 31; the column stirrups 32 are sleeved on the inner core column 1. Further, the column stirrups 32 are divided into the first column stirrups 321 of the first structural form and the second column stirrups 322 of the second structural form. Taking two first column stirrups 321 and one second column stirrups 322 as a layer of stirrup structure, they are hoop-mounted on multiple column main reinforcement bars 31 in layers.

[0060] Correspondingly, as a preferred embodiment of this embodiment, the number of column main reinforcement bars 31 in this embodiment is 12, which are distinguished as four corner column main reinforcement bars 31 located at the four corner positions in the post-cast composite layer 6 and eight side column main reinforcement bars 31 located at the four side positions in the post-cast composite layer 6, with two side column main reinforcement bars 31 on each side. Further, the above-mentioned first column stirrups 321 are strip-shaped, and the second column stirrups 322 are square. The second column stirrups 322 of each layer of stirrup structure are hoop-mounted on the four corner column main reinforcement bars 31; and the two second column stirrups 322 of each layer of stirrup structure are respectively hoop-mounted on the four side column main reinforcement bars 31 at the opposite side positions. The position of the inner core column 1 is preferably implemented at the center position of the steel cage formed by the column main reinforcement bars 31 and the column stirrups 32.

[0061] S3 Arrange outer formwork 2: Specifically, please refer to Figure 1 and Figure 5 . The outer formwork shell 2 is formed by enclosing multiple outer formwork plates 21. After the casting of the post-cast composite layer 6, it can be removed or not removed. When not removed, its material is preferably a high-performance concrete plate or a fiber concrete plate; when removed later, common wooden formwork or metal formwork can be used. The hollow-core precast column in this embodiment is implemented as a square column. Although the square column is not the only structural limitation of this embodiment, this embodiment describes the square column as the best implementation method. For this reason, the number of the outer formwork plates 21 is preferably four, and they enclose each other to form the outer formwork shell 2. To maintain stable positioning, positioning angle steels 5 are provided at the inner corners of the outer formwork shell 2 for installation and positioning.

[0062] Two implementation methods for installing the outer formwork shell 2 by the tie members 4 in this embodiment are exemplified as follows: First, please refer to Figure 2 and Figure 6 . The tie member 4 passes through the inner core column 1 and is in tension on both sides of the outer formwork shell 2. In this regard, the tie member 4 is preferably a tie rod, and a through hole 11 is provided through the side of the inner core column 1. The tie rod passes through the through hole 11 and its two ends are respectively tied to the outer formwork shell 2. Further, there are at least two groups of the tie members 4, and the two groups of tie members 4 are respectively arranged along the first direction and the second direction, and the first direction and the second direction are perpendicular to each other; furthermore, each group of tie members 4 includes multiple rows arranged in layers along the height direction of the hollow-core precast column, and each row includes two tie rods. This is taken as a preferred implementation method and does not form the only limitation of this implementation method. By arranging vertically and horizontally in the first direction and the second direction, the position of the inner core column 1 in the first direction and the second direction is restricted, playing a role in positioning and stabilizing.

[0063] Second, please refer to Figure 3 . The tie member 4 ties the inner core column 1 and the outer formwork shell 2. In this regard, the tie member 4 is preferably a tie rod 4a. An embedded threaded sleeve 7 is provided on the side of the inner core column 1. The two ends of the tie rod 4a have threaded sections. One end of the tie rod 4a facing the inner core column 1 is threadedly connected to the embedded threaded sleeve 7, and the other end is tied to the outer formwork shell 2. This method forms a single-sided tie, but it can be arranged in multiple directions, and the same tie effect between the outer formwork shell 2 and the inner core column 1 can be achieved. Further, there are at least four groups of the tie members 4, and the four groups of tie members 4 are respectively arranged along the four sides of the inner core column 1; furthermore, each group of tie members 4 includes multiple rows arranged in layers along the height direction of the hollow-core precast column, and each row includes two tie rods 4a. This is taken as a preferred implementation method and does not form the only limitation of this implementation method. By arranging on four sides, the position of the inner core column 1 is restricted, playing a role in positioning and stabilizing.

[0064] Of the two methods mentioned above, in this embodiment, the anchor 4 is preferably anchored in the same manner as the outer formwork 2. Specifically, the anchor 4 is anchored to one end of the outer formwork 2 and is provided with a clamping assembly, the clamping assembly comprising an inner adjustment member 42 and an outer adjustment member 41, the inner adjustment member 42 and the outer adjustment member 41 are respectively located on the inner and outer sides of the outer formwork 2 and are threadedly sleeved on the anchor 4, the inner adjustment member 42 and the outer adjustment member 41 clamp and position the outer formwork 2. Preferably, the inner adjustment member 42 and the outer adjustment member 41 are both threaded gaskets. When the outer formwork 2 uses a non-disassembly template, a countersunk hole 20 is formed on the outer side of the outer formwork 21, and the outer adjustment member 41 is arranged in the countersunk hole 20 to form a flat surface.

[0065] In order to further improve the rigidity of the outer mold shell 2 and prevent mold expansion, please refer to Figure 5 , Figure 6 , an outer mold reinforcement is also provided on the outer side of the outer mold shell 2, and the outer mold reinforcement is tied and installed on the outer side of the outer mold shell 2 by the tie member 4. Further, the outer mold reinforcement is selected as a reinforcement rib or a reinforcement rod; it can be further preferably a wooden rod or a square steel pipe, etc., a threaded hole is opened on the outer mold reinforcement, and the tie member 4 is tied and attached to the outer side of the outer template 21 to form a board surface reinforcement effect.

[0066] The beneficial effects of this embodiment are: This method meets the connection length of the existing cast-in-place specifications by installing the structural reinforcement 3 on the outer side of the inner core column 1 and pouring the overlapping layer 6, which is equivalent to cast-in-place, ensuring that the vertical connection is safe and reliable; and the inner core column 1 is more convenient to prefabricate without protruding steel bars, and the docking installation of the structural reinforcement 3 is more convenient, which completely solves the problems of inaccurate alignment of the grouting sleeve prefabricated shear wall, insufficient grouting, steel bar cutting, and difficult detection; and the anchor 4 is tied to the outer formwork 2 to form a spatial three-dimensional force system, which increases stability and has good crack resistance.

[0067] Furthermore, the present invention is described in detail above in conjunction with the embodiments of the accompanying drawings, and a person skilled in the art can make various variations of the present invention according to the above description. Therefore, certain details in the embodiments should not constitute a limitation of the present invention, and the scope of protection of the present invention shall be defined by the scope of the attached claims.

Claims

1. Hollow sandwich prefabricated column, characterized in that: include: Inner core column; An outer formwork shell, the outer formwork shell is arranged around the inner core column and sandwiched between the outer formwork shell and the inner core column to form a post-casting overlapping layer; Structural reinforcement, the structural reinforcement is arranged in the post-cast superimposed layer and surrounds the inner core column; An anchor is anchored to the outer formwork.

2. The hollow sandwich prefabricated column according to claim 1, characterized in that: The anchors are at least two groups, and the two groups of anchors are arranged along a first direction and a second direction respectively, and the first direction and the second direction are perpendicular to each other.

3. The hollow sandwich prefabricated column according to claim 2, characterized in that: The anchor piece is passed through the inner core column and is pulled on two sides of the outer formwork.

4. The hollow sandwich prefabricated column according to claim 3, characterized in that: The tie member is a tie rod, a through hole is formed through the side of the inner core column, the tie rod is passed through the through hole and both ends are respectively tied to the outer formwork.

5. The hollow sandwich prefabricated column according to claim 2, characterized in that: The anchor is tied to the inner core column and the outer formwork.

6. The hollow sandwich prefabricated column according to claim 5, characterized in that: The tie rod is a tie rod, and a pre-embedded threaded sleeve is provided on the side of the inner core column. Both ends of the tie rod have threaded sections. One end of the tie rod facing the inner core column is threadedly connected to the pre-embedded threaded sleeve, and the other end is tied to the outer mold shell.

7. The hollow sandwich prefabricated column according to claim 3 or 6, characterized in that: The anchor is anchored to one end of the outer formwork and is provided with a clamping assembly, the clamping assembly includes an inner adjusting member and an outer adjusting member, the inner adjusting member and the outer adjusting member are respectively located at the inner and outer sides of the outer formwork and are threadedly sleeved on the anchor, the inner adjusting member and the outer adjusting member clamp and position the outer formwork.

8. The hollow sandwich prefabricated column according to claim 1, characterized in that: The outer formwork shell includes four outer formworks surrounded by four sides, and the anchors are anchored to the outer formworks.

9. The hollow sandwich prefabricated column according to claim 8, characterized in that: The structural reinforcement includes at least column main reinforcement and column stirrups; a plurality of the column main reinforcements are located in the post-cast overlapping layer and close to the corners on the inner side of the outer formwork, and the column stirrups are arranged on the plurality of the column main reinforcements; the column stirrups are sleeved on the inner core column.

10. The hollow sandwich prefabricated column according to claim 8, characterized in that: Positioning angle steels are provided at the inner corners of the outer formwork.

11. The hollow sandwich prefabricated column according to claim 1, characterized in that: An outer mold reinforcement is also provided on the outer side of the outer mold shell, and the outer mold reinforcement is fastened and installed on the outer side surface of the outer mold shell by the fastening member.

12. A method for forming a hollow sandwich prefabricated column according to claims 1 to 11, characterized in that: The following steps are involved: Prefabricated inner core column; Arranging structural ribs, and surrounding the inner core column with the structural ribs; Arrange the outer formwork, surround the inner core column and the structural ribs, and fasten them to the inner core column, and locate the structural ribs in a post-cast overlapping layer formed by sandwiching the outer formwork and the inner core column.

Images