A prefabricated modular outer column base and its construction method

Abstract

This invention relates to the field of building structural engineering technology, and provides a prefabricated modular external column base and its construction method, including a structural column, a concrete external module, column top stiffening ribs, and main reinforcement bars and reserved anchor bolts embedded in the foundation; the bottom of the structural column is welded with a base plate for connection and fixation to the foundation through the reserved anchor bolts; the concrete external module is used to fit over the structural column and has several reserved reinforcement channels for the main reinforcement bars to pass through during assembly; the top surface of the concrete top module is provided with a first installation groove for installing the column top stiffening ribs; the bottom surface of the concrete top module, the top surface of the concrete bottom module, and the top and bottom surfaces of the concrete middle module are all provided with corrugated grooves for the overlapping of adjacent modules during assembly. It features simple construction, reliable force transmission, convenient and efficient installation, and energy saving and environmental protection, providing guidance for the design and construction of prefabricated steel-concrete external column bases.

Description

Technical Field

[0001] This invention relates to the field of building structure engineering technology, and in particular to a prefabricated modular external column base and its construction method. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] Promoting industrialized construction is an important way to facilitate the transformation and upgrading of the construction industry, and also a key direction for its development. Traditional construction mainly relies on on-site construction, which results in problems such as unstable quality, low construction efficiency, high labor demand, and high resource and energy consumption.

[0004] Compared to traditional exposed and embedded column bases, enclosed column bases offer advantages such as stable force transmission and ease of construction, making them highly practical in engineering projects. However, research on enclosed column bases has primarily focused on calculating and improving their mechanical properties, with relatively little research on structural improvements using prefabricated and modular designs. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a prefabricated modular external column base and its construction method, which avoids repeated formwork erection. By adjusting the number of intermediate segments used, the external height can be easily adjusted while ensuring the applicable external width. It features simple structure, reliable force transmission, convenient and efficient installation, and energy saving and environmental protection, providing guidance for the design and construction of prefabricated steel pipe concrete external column bases.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] The first aspect of the present invention provides a prefabricated modular outer column base.

[0008] A prefabricated modular outer column base includes a structural column, a concrete outer module, a column top stiffening rib, and main reinforcement bars and reserved anchor bolts embedded in the foundation;

[0009] The bottom of the structural column is welded with a base plate, which is used to connect and fix it to the foundation through the reserved anchor bolts;

[0010] The concrete outer module is used to be fitted over the structural column and has several pre-reserved rebar channels for the main reinforcement bars to pass through during assembly. The concrete outer module includes a concrete top module, a concrete bottom module, and several concrete intermediate modules. The top surface of the concrete top module is provided with a first mounting groove for attaching the column top stiffening rib. The bottom surface of the concrete top module, the top surface of the concrete bottom module, and the top and bottom surfaces of the concrete intermediate modules are all provided with corrugated grooves for overlapping between adjacent modules during assembly.

[0011] Furthermore, the interior of the concrete intermediate module is provided with multiple perforated reinforcing slabs at a set interval, and the perforated reinforcing slabs are connected by welding steel bars.

[0012] Furthermore, the interior of the concrete top module is provided with perforated reinforcing slabs at a set interval, and the perforated reinforcing slabs are welded together with steel bars to form a steel truss.

[0013] Furthermore, the column top stiffening rib includes a horizontally perforated plate;

[0014] The horizontal perforated plate is used to install in the first mounting groove. After the main rib extends out of the hole in the horizontal perforated plate, it is fixed with a nut.

[0015] Furthermore, the column top stiffening rib includes a trapezoidal vertical plate;

[0016] One side of the trapezoidal vertical plate is fixedly connected to the horizontal perforated plate, and the other side is fixedly connected to the side of the structural column by welding.

[0017] Furthermore, the foundation has a reserved second mounting groove, the second mounting groove having the same bottom surface area as the concrete outer module, and the groove depth having the same thickness as the bottom plate.

[0018] Furthermore, the second mounting slot is used to place the structural column and the concrete cladding module.

[0019] Furthermore, the bottom surface of the concrete bottom module is roughened.

[0020] Furthermore, the main reinforcement is made of steel bars or steel strands, and prestress is applied by tensioning after passing through the steel bar ducts.

[0021] A second aspect of the present invention provides a construction method for a prefabricated modular external column base as described in the first aspect, comprising the following steps:

[0022] Fabrication of structural columns, concrete outer modules, and column top stiffening ribs;

[0023] Pre-embed main reinforcement bars and reserve anchor bolts in the foundation;

[0024] The concrete bottom module is hoisted to the installation position so that the main reinforcement bars pass through the reinforcement ducts;

[0025] The structural column is hoisted and inserted into the concrete outer module from top to bottom, and the bottom plate of the structural column is fixed to the foundation by pre-reserved anchor bolts.

[0026] Install the concrete intermediate modules and concrete top modules one by one;

[0027] The stiffening ribs are hoisted to the top of the structural column and placed in the first mounting slot.

[0028] Compared with the prior art, the beneficial effects of the present invention are:

[0029] 1. The prefabricated modular outer column base of the present invention has a concrete outer module that can be customized in terms of outer height according to different structural column sizes in the project. Through the standard outer module, it is applicable to the needs of projects with most sizes. The module has a high degree of prefabrication and versatility, avoiding repeated mold making in the factory.

[0030] 2. The prefabricated modular outer column base described in this invention is easy to assemble, reducing the work of on-site binding of steel cages and formwork for in-situ casting. When constructed according to the designed procedure, each component forms an installation groove with each other, making assembly, grouting and construction very quick and efficient, improving the efficiency of industrialized building assembly, and conforming to the industry development trend of "low carbon, green and prefabricated".

[0031] 3. The prefabricated modular external column base of the present invention has the characteristics of simple structure, reliable force transmission, convenient and efficient installation, energy saving and environmental protection, and provides guidance for the design and construction of prefabricated steel pipe concrete external column base. Attached Figure Description

[0032] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention and do not constitute an improper limitation of the invention.

[0033] Figure 1 This is a structural diagram of the prefabricated modular outer column base of Embodiment 1 of the present invention;

[0034] Figure 2 This is a structural diagram of the concrete outer casing module of Embodiment 1 of the present invention;

[0035] Figure 3 This is a structural diagram of the concrete intermediate module of Embodiment 1 of the present invention;

[0036] Figure 4 This is a structural diagram of the concrete top module of Embodiment 1 of the present invention;

[0037] Figure 5This is a structural diagram of the concrete bottom module of Embodiment 1 of the present invention;

[0038] Figure 6 This is a diagram showing the connection between perforated reinforcing slabs inside the concrete intermediate module of Embodiment 1 of the present invention.

[0039] Figure 7 This is a diagram showing the connection between perforated reinforcing slabs inside the concrete top module of Embodiment 1 of the present invention.

[0040] Figure 8 This is a schematic diagram of the installation of the prefabricated modular outer column base according to Embodiment 1 of the present invention;

[0041] Figure 9 This is a schematic diagram of the mounting holes of the concrete bottom module in Embodiment 1 of the present invention;

[0042] Figure 10 This is a structural diagram based on Embodiment 1 of the present invention;

[0043] Figure 11 This is a schematic diagram of the structural column welded base plate and shear studs in Embodiment 1 of the present invention;

[0044] Figure 12 This is a structural diagram of the column top stiffening rib in Embodiment 1 of the present invention;

[0045] Figure 13(a) is a schematic diagram (top view) of the connection between the threaded nail and the stud in Embodiment 1 of the present invention.

[0046] Figure 13(b) is a structural diagram of the threaded nail and stud before connection in Embodiment 1 of the present invention;

[0047] Figure 13(c) is a structural diagram of the threaded nail and stud connected according to Embodiment 1 of the present invention. Detailed Implementation

[0048] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0049] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0050] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0051] In this invention, terms such as "fixed connection," "connected," and "linked" should be interpreted broadly, indicating a fixed connection, an integral connection, or a detachable connection; a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can determine the specific meaning of these terms in this invention based on the specific circumstances, and they should not be construed as limitations on the invention.

[0052] Where there is no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0053] Example 1

[0054] like Figure 1 As shown, Embodiment 1 of the present invention provides a prefabricated modular outer column base, including: a structural column 1, a concrete outer module 2, main reinforcement 4 embedded in the foundation 3, a column top stiffening rib 5, a base plate 6, a perforated reinforcement plate 22, a reserved anchor bolt 7 embedded in the foundation 3, a threaded nail 8 and a shear bolt 9, and a positioning anchor bolt 10.

[0055] like Figure 2 As shown, the concrete outer module 2 is a square ring-shaped standard precast concrete module. The middle of the concrete outer module 2 is left open according to the size of the base plate, and several steel bar channels 21 are reserved on the four sides. The interior is provided with perforated steel reinforcement plates 22. The position of the channels opened in the perforated steel reinforcement plates 22 is consistent with the position of the reserved steel bar channels 21.

[0056] like Figure 2 As shown, the external width of the concrete outer casing module 2 shall not be less than twice the thickness of the outer concrete casing as specified in the relevant column base specifications, and the height shall be selected according to the actual situation of the project. Taking a standard height of 200 mm as an example, in the project, 200 to 400 mm round steel pipe columns were used. According to the relevant column base specifications, the outer casing height shall not be less than 2.5D, and the outer casing height shall be at least 0.5 to 1 meter. Accordingly, 3 to 6 modules can be selected to achieve different heights of outer concrete casing assembly.

[0057] like Figure 2 As shown, the concrete outer module 2 includes a top concrete module 23, a bottom concrete module 25, and several intermediate concrete modules 24, depending on the location of use. In application, the number of intermediate concrete modules 24 can be adjusted to control the height of the concrete outer module 2.

[0058] like Figure 3 As shown, corrugated grooves 26 are opened on the top and bottom surfaces of the concrete intermediate module 24, and the corrugated grooves 26 are used to allow adjacent modules to be tightly overlapped during assembly.

[0059] like Figure 4As shown, the bottom surface of the concrete top module 23 is provided with a corrugated groove to facilitate connection with the concrete middle module 24, and the top surface of the concrete top module 23 is provided with a first installation groove 27 to facilitate the installation of column top stiffening ribs 5.

[0060] like Figure 5 and Figure 9 As shown, the top surface of the concrete bottom module 25 is provided with a corrugated groove to facilitate connection with the concrete middle module 24. The bottom surface of the concrete bottom module 25 is roughened to enhance the connection with the foundation after installation. Mounting holes are reserved at the four corners of the concrete bottom module 25 near the bottom surface so that positioning and leveling can be achieved through these mounting holes when installing the concrete bottom module 25. The axis of the mounting hole is parallel to the axis of the rebar channel 21.

[0061] like Figure 6 As shown, multiple perforated reinforcing plates 22 are arranged at a set interval inside the concrete intermediate module 24, and the perforated reinforcing plates 22 inside the concrete intermediate module 24 are welded together by short steel bars 28.

[0062] like Figure 7 As shown, multiple perforated reinforcing slabs 22 are arranged at a set interval inside the concrete top module 23. The perforated reinforcing slabs 22 inside the concrete top module 23 are welded together with short steel bars 28 to form a steel truss, which provides additional local reinforcement in the top module.

[0063] like Figure 8 and Figure 10 As shown, several steel bar channels 21 are reserved on the four sides of the concrete outer module 2. The lower end of the main reinforcing bar 4 is embedded in the foundation. During installation, the main reinforcing bar 4 extends out from the steel bar channels 21 of the concrete outer module 2 and the column top stiffening rib 5. The upper end of the main reinforcing bar 4 is fixed with nuts at the top of the concrete outer module 2 and the column top stiffening rib 5.

[0064] Among them, the main reinforcement 4 can be made of high-strength steel bars or steel strands, and a certain prestress is applied after passing through the duct.

[0065] See Figure 8 and Figure 12 The column top stiffening rib 5 is located at the top of the concrete outer module 2 and consists of a horizontal perforated plate 51 and a trapezoidal vertical plate 52. The horizontal perforated plate 51 has reinforcing bar channels 21 around its perimeter. The horizontal perforated plate 51 is installed in the first mounting groove 27 on the top surface of the concrete outer module 2. After the main reinforcing bar 4 extends out of the reinforcing bar channels 21, it is fixed with nuts. The trapezoidal vertical plate 52 is welded to the side of the structural column 1. One side of the trapezoidal vertical plate 52 is fixedly connected to the horizontal perforated plate 51, and the other side is fixedly connected to the side of the structural column 1 by welding.

[0066] like Figure 10 and Figure 11As shown, a base plate 6 is pre-welded to the bottom of the structural column 1, and the base plate 6 is connected and fixed to the foundation 3 by pre-installed anchor bolts 7.

[0067] The second installation groove 31 reserved in the foundation 3 has an area equivalent to the bottom surface area of ​​the concrete outer module 2. The groove depth of the second installation groove 31 is equivalent to the thickness of the base plate 6. After the base plate 6 of the structural column 1 is fixed to the foundation 3 by the reserved anchor bolts 7, concrete is poured in the second installation groove 31 to level it, and then the concrete outer module 2 is installed to achieve wet connection and fixation between the outer column foot and the foundation 3.

[0068] like Figure 9 and Figure 10 As shown, positioning anchor bolts 10 are also pre-embedded on the foundation 3, which are used to cooperate with the mounting holes of the concrete bottom module 25 for positioning and leveling during the installation of the concrete bottom module 25.

[0069] like Figure 1 and Figure 8 As shown, the gap between the concrete outer module 2 and the structural column 1 is filled with concrete after installation to achieve a stable connection between the structural column 1 and the concrete outer module 2. Reinforcing bar channels 21 are pre-drilled on the concrete outer module 2. After the main reinforcing bars 4 pass through, cement grout is injected along the channels to prevent corrosion of the reinforcing bars and to achieve overall connection and fixation of the column base.

[0070] As shown in Figures 13(a), 13(b), and 13(c), threaded nails 8 are pre-embedded inside the concrete outer module 2, and nuts 81 and sleeves 82 are sequentially fitted on it. Nuts 81 are close to the concrete outer module 2, and short, headless studs (shear studs 9) are provided on the outer side of the structural column 1. During installation, the threaded nails 8 on the top concrete module 23, bottom concrete module 25, and middle concrete module 24 are aligned with the shear studs 9 arranged on the structural column. The sleeves 82 are pushed onto the shear studs 9 and held against the structural column 1. The nuts 81 of the threaded nails 8 are screwed onto the threads of the threaded nails 8 for fixation. The sleeves 82 are longer than the shear studs 9, allowing the threaded nails 8 and shear studs 9 to connect to each other through the sleeves 82. This strengthens the connection between the concrete outer module 2 and the structural column 1 while fulfilling the function of shear studs, thus enhancing the overall integrity of the outer structure.

[0071] In this embodiment, the pre-installed anchor bolts 7 can be pre-stressed anchor rods connected with high-strength bolts to apply a certain preload to the base plate. The main reinforcement 4 can be prestressed steel bars or steel strands, and tensioned after passing through the reinforcement ducts. The combined effect of the pre-stressed anchor rods and prestressed tendons helps to further improve the overall bending bearing capacity and seismic resistance of the column base.

[0072] This embodiment of a prefabricated modular external column base focuses on the external connection between the steel tube concrete column and the foundation. All related components can be fabricated in the factory. A standard precast concrete external module for the external column base has been developed, which not only ensures construction quality but also facilitates the reinforcement of weak parts during the prefabrication stage. The stiffening ribs at the top of the column and the new stud structure improve the overall integrity of the external column base, increasing the load-bearing capacity by more than 20% compared with the traditional cast-in-place external column base.

[0073] This embodiment of the prefabricated modular external column base adopts a prefabricated external column base, which reduces the work of tying steel cages and casting on-site. Compared with the traditional external column base construction method, it can make the treatment of the lower foundation and the prefabrication of the upper components simultaneously, thereby effectively saving the construction period.

[0074] This embodiment of a modular prefabricated column base fully utilizes the characteristic that the height of the outer concrete covering is the main variable when the column base is of different column sizes. The developed column base outer concrete covering module can freely customize the outer height according to different structural column sizes in the project. Through standard outer covering stage modules, it is applicable to the needs of projects with most sizes. The module has a high degree of prefabrication and versatility, avoiding repeated mold making in the factory.

[0075] The prefabricated modular outer column base developed in this embodiment has a simple column base node structure and is easy to assemble. When constructed according to the program design, each component forms an installation groove with each other, which is quick and efficient in assembly, grouting and construction, improving the assembly efficiency of building industrialization and conforming to the industry development trend of "low carbon, green and prefabricated".

[0076] In actual engineering projects, due to the varying dimensions of structural columns, the outer casing of the column base also requires different casing heights and thicknesses. Taking the common round steel pipe casing column base as an example, according to the design and construction specifications for casing column bases, the minimum casing thickness is specified in the specifications as 180 mm, and the casing height should be greater than 2.5 times the diameter of the steel pipe. In common steel structure buildings, several steel pipe columns with different diameters are usually selected according to the load-bearing requirements. For example, for steel pipe columns with diameters of 200, 300, and 400 mm, the minimum casing widths are 560, 660, and 760 mm, respectively, and the minimum casing heights are 500, 750, and 1000 mm, respectively. The variation in casing height is significantly greater than that in casing width.

[0077] The standard width and height of the outer module segments developed in this embodiment avoid repeated formwork. By adjusting the number of intermediate segments used, the outer height can be easily adjusted provided that the outer width is suitable.

[0078] In this embodiment, a new type of steel plate skeleton is used inside the module, which reduces the steel cage binding process in the prefabrication stage of the original scheme and further improves the efficiency of the project.

[0079] Because this embodiment uses prefabricated top module segments, the width of the outer column base and the protruding position of the main reinforcement remain fixed even with different column sizes. Based on this, this embodiment developed a standard perforated annular stiffening rib base plate and can reserve installation slots for the stiffening ribs during the prefabrication of the top module, reducing the amount of steel used in the stiffening rib plate, improving design efficiency, and facilitating faster construction.

[0080] Example 2

[0081] Embodiment 2 of the present invention provides a construction method for a prefabricated modular external column base as in Embodiment 1, comprising the following steps:

[0082] Step 1: According to the design requirements, process and fabricate the structural column 1, concrete outer module 2, base plate 6, column top stiffening rib 5, threaded nail 8, and shear stud 9;

[0083] Step 2: Prepare the foundation, pre-embed main reinforcement bars 4, pre-reserve anchor bolts 7, positioning anchor bolts 10, and pre-reserve the second installation groove 31;

[0084] Step 3: Hoist the concrete bottom module 25 of the concrete outer module 2 to the installation position and support it to a certain height so that the embedded main reinforcement 4 passes through the reserved reinforcement hole 21 of the concrete outer module 2. Place the concrete bottom module 25 in the second installation groove 31 and use the positioning anchor bolt 10 to cooperate with the installation hole of the concrete bottom module 25 to position and level the concrete bottom module 25 during installation.

[0085] Step 4: Insert the structural column 1 from top to bottom into the middle of the concrete outer module 2, leaving a gap, and place the base plate 6 of the structural column 1 into the second installation groove 31.

[0086] Step 5: Install and fix the structural column 1 by pre-installing anchor bolts 7, and then pour concrete to level the second installation groove 31, and connect the threaded nails 8 and shear bolts 9 of the bottom concrete module 25.

[0087] Step 6: Install the concrete intermediate module 24 and concrete top module 23 of the concrete outer module one by one, and make the adjacent modules fit together tightly through the corrugated groove 26. When installing the concrete intermediate module 24 and concrete top module 23, make the pre-embedded main reinforcement 4 pass through the reserved reinforcement hole 21 of the concrete outer module 2, and connect the threaded nails 8 and shear studs 9 of the concrete intermediate module 24 and concrete top module 23. Finally, fill the gap between the structural column 1 and the concrete outer module 2 with concrete.

[0088] Step 7: After filling the reserved steel bar duct 21 with cement grout, hoist the column top stiffening rib 5 to the top of the structural column 1, so that the embedded main reinforcement 4 passes through the reserved steel bar duct on the horizontal opening plate of the column top stiffening rib 5, and fixes the embedded main reinforcement 4 with nuts on the upper part, and then connects and fixes the trapezoidal vertical plate 52 to the side of the structural column 1 by welding.

[0089] The installation is now complete.

[0090] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A prefabricated modular outer column base, characterized in that: This includes structural columns, concrete outer modules, column top stiffening ribs, and main reinforcement bars and anchor bolts embedded in the foundation. The bottom of the structural column is welded with a base plate, which is used to connect and fix it to the foundation through the reserved anchor bolts; The concrete outer module is used to be fitted over the structural column and has several pre-reserved rebar channels for the main reinforcement bars to pass through during assembly. The concrete outer module includes a top concrete module, a bottom concrete module, and several intermediate concrete modules. The top surface of the top concrete module is provided with a first mounting groove for attaching the column top stiffening rib. The bottom surface of the top concrete module, the top surface of the bottom concrete module, and the top and bottom surfaces of the intermediate concrete modules are all provided with corrugated grooves for overlapping between adjacent modules during assembly. The interior of the concrete intermediate module is equipped with multiple perforated reinforcing slabs at a set interval, and the perforated reinforcing slabs are connected by welding steel bars. The column top stiffening rib includes a horizontal perforated plate; the horizontal perforated plate is used to install in the first mounting groove, and after the main reinforcement extends out of the hole of the horizontal perforated plate, it is fixed with nuts; The column top stiffening rib includes a trapezoidal vertical plate; one side of the trapezoidal vertical plate is fixedly connected to the horizontal perforated plate, and the other side is fixedly connected to the side of the structural column by welding.

2. The prefabricated modular outer column base as described in claim 1, characterized in that: The concrete top module is equipped with perforated reinforcing slabs at set intervals, and the perforated reinforcing slabs are welded together with steel bars to form a steel truss.

3. The prefabricated modular outer column base as described in claim 1, characterized in that: The foundation has a reserved second installation groove, the second installation groove has the same bottom area as the concrete outer module, and the groove depth is the same as the thickness of the bottom plate.

4. The prefabricated modular outer column base as described in claim 3, characterized in that: The second mounting slot is used to place the structural column and the concrete outer casing module.

5. The prefabricated modular outer column base as described in claim 1, characterized in that: The bottom surface of the concrete bottom module is roughened.

6. The prefabricated modular outer column base as described in claim 1, characterized in that: The main reinforcement is made of steel bars or steel strands, and is tensioned to apply prestress after passing through the steel bar ducts.

7. A construction method for a prefabricated modular external column base as described in any one of claims 1-6, characterized in that: Includes the following steps: Fabrication of structural columns, concrete outer modules, and column top stiffening ribs; Pre-embed main reinforcement bars and reserve anchor bolts in the foundation; The concrete bottom module is hoisted to the installation position so that the main reinforcement bars pass through the reinforcement ducts; The structural column is hoisted and inserted into the concrete outer module from top to bottom, and the bottom plate of the structural column is fixed to the foundation by pre-reserved anchor bolts. Install the concrete intermediate modules and concrete top modules one by one; The stiffening rib is hoisted to the top of the structural column and placed in the first installation slot; the pre-embedded main reinforcement is passed through the reserved reinforcement hole on the horizontal opening plate of the stiffening rib at the top of the column, and after being fixed with nuts on the upper part of the pre-embedded main reinforcement, the trapezoidal vertical plate is connected and fixed to the side of the structural column by welding.

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