Shockproof tough prefabricated assembly type concrete column and construction method thereof

Abstract

A shockproof tough prefabricated assembly type concrete column structure comprises an upper prefabricated column, a lower prefabricated column and a connecting profile steel section. An upper end plate is arranged at the bottom of the upper prefabricated column; a lower end plate is arranged above the lower prefabricated column; the connecting profile steel section is connected between the upper end plate and the lower end plate, and second studs are arranged on the outer surface of the connecting profile steel section at intervals; concrete or high-strength mortar is poured between the upper end plate and the lower end plate; the top of the upper end plate is provided with an anti-shear pin piece; first studs are arranged on the outer surface of the anti-shearing pin piece at intervals; the lower ends of the upper column vertical ribs penetrate through the upper end plate and are fixed through first nuts; the upper end of the lower column vertical rib penetrates through the lower end plate and is fixed through a second nut; connecting sleeves are arranged at the bottom of the lower end plate at intervals; additional shear-resistant ribs are arranged in the middle of the lower prefabricated column at intervals, and the upper ends of the additional shear-resistant ribs are connected into the connecting sleeve in a threaded mode. The technical problems that according to a traditional existing joint connecting technology, the requirements for structural ductility and energy dissipation capacity of a high-intensity earthquake area are difficult to meet, and the construction efficiency is reduced due to the fact that a connecting structure between prefabricated parts is complex are solved.

Description

Technical Field

[0001] The present invention belongs to the field of prefabricated buildings, and particularly relates to a seismic and ductile prefabricated concrete column structure and a construction method thereof. Background Art

[0002] A prefabricated building refers to a building that is prefabricated and manufactured in a factory in advance, and then transported to the construction site, and assembled and installed on site through reliable connection methods.

[0003] In recent years, prefabricated concrete structures have been rapidly promoted in the construction field of our country due to their significant advantages such as short construction period, low environmental pollution, and low resource consumption. However, it has been found in engineering practice that there are still significant bottlenecks in the application of such structural systems in high-intensity earthquake areas: First, the existing joint connection technologies are difficult to meet the requirements of high-intensity earthquake areas for the ductility and energy dissipation capacity of structures, and the problem of insufficient seismic performance of key parts such as beam-column joints is particularly prominent; Second, the connection structure between prefabricated components is complex, resulting in a reduction in construction efficiency.

[0004] Therefore, providing a seismic and ductile prefabricated concrete column has extremely important functions and significance for the application and development of prefabricated buildings in our country. Summary of the Invention

[0005] The purpose of the present invention is to provide a seismic and ductile prefabricated concrete column structure and a construction method thereof, and to solve the technical problems that the traditional existing joint connection technologies are difficult to meet the requirements of high-intensity earthquake areas for the ductility and energy dissipation capacity of structures, and the connection structure between prefabricated components is complex, resulting in a reduction in construction efficiency.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions.

[0007] An earthquake-proof and ductile prefabricated concrete column structure includes an upper precast column and a lower precast column; both the upper precast column and the lower precast column are reinforced concrete columns; it also includes a connecting steel section; the bottom of the upper precast column is provided with an upper end plate; the lower end plate is provided above the lower precast column, and there is a spacing between the lower end plate and the lower precast column; the connecting steel section is connected between the upper end plate and the lower end plate, and second stud bolts are arranged at intervals on the outer surface of the connecting steel section; concrete or high-strength mortar is poured in the space between the upper end plate and the lower end plate; on the top of the upper end plate, shear studs are arranged inside the upper precast column; first stud bolts are arranged at intervals on the outer surface of the shear studs; the lower end of the upper column vertical reinforcement of the upper precast column passes through the upper end plate and is fixed by a first nut; the upper end of the lower column vertical reinforcement of the lower precast column passes through the lower end plate and is fixed by a second nut; connecting sleeves are arranged at intervals at the bottom of the lower end plate; additional shear reinforcement bars are arranged at intervals in the lower precast column, and the upper ends of the additional shear reinforcement bars are threadedly connected in the connecting sleeves, and the lower ends of the additional shear reinforcement bars extend into the lower precast column; beam end reinforcement bars extend into the space between the lower end plate and the lower precast column, and concrete is poured.

[0008] Preferably, node cross reinforcement bars are arranged between the lower end plate and the lower precast column; the ends of the node cross reinforcement bars are connected to the lower column vertical reinforcement bars at corresponding positions.

[0009] Preferably, the upper end plate is welded to the upper precast column, the lower end plate is welded to the lower precast column; the connecting sleeve is welded to the lower end plate.

[0010] Preferably, the length of the part where the lower end of the additional shear reinforcement bar extends into the lower precast column is adapted to the spacing between the lower end plate and the lower precast column.

[0011] Preferably, the horizontal cross-sectional shape of the shear stud is I-shaped, circular, rectangular or cross-shaped.

[0012] Preferably, the horizontal cross-sectional shape of the connecting steel section is I-shaped, circular, rectangular or cross-shaped, and the connecting steel section is welded to the upper end plate and the lower end plate respectively.

[0013] Preferably, the shear stud is pre-welded to the upper end plate during prefabrication in the factory.

[0014] The construction method of this earthquake-proof and ductile prefabricated concrete column structure includes the following steps.

[0015] Step 1, prefabricate the upper precast column, the lower precast column, the lower end plate, the upper end plate, the shear stud and the connecting steel section, connect the upper end plate and the shear stud together in advance and embed them into the upper precast column.

[0016] Step 2: prefabricate and install the lower prefabricated column, lower end plate and additional shear reinforcement.

[0017] Step three, hoist the upper prefabricated column provided with the upper end plate and the connecting steel section, and fix the upper column vertical reinforcement to the upper end plate through the first nut, and fix the lower column vertical reinforcement to the lower end plate through the second nut.

[0018] Step 4: Connect the connecting steel sections to the upper end plate and the lower end plate respectively.

[0019] Step 5: Extend the end reinforcement of the beam into the core area of ​​the node between the lower end plate and the lower precast column, and pour concrete to complete the installation of the beam and floor slab.

[0020] Step six, set up the formwork of the area between the upper end plate and the lower end plate. The formwork adopts standardized fixed formwork to facilitate installation and disassembly, and pour concrete or high-strength mortar in the area between the upper end plate and the lower end plate. The strength of the poured concrete or high-strength mortar is not lower than the strength of the prefabricated column. The construction is now completed.

[0021] Preferably, in step one, when prefabricating the upper prefabricated column end plate, the upper end plate is pre-welded to the shear pin; in step two, when prefabricating the lower end plate, the connecting sleeve is pre-welded to the lower end plate, and the additional shear reinforcement is pre-connected to the connecting sleeve; the first nut is pre-welded to the upper end plate during prefabrication, and connected to the upper column vertical reinforcement; the second nut is pre-welded to the lower end plate during prefabrication, and connected to the lower column vertical reinforcement respectively.

[0022] Compared with the prior art, the present invention has the following characteristics and beneficial effects.

[0023] 1. The present invention adopts a combination of connecting steel sections + second bolts: the steel sections are welded to the end plates to form a rigid skeleton, and the second bolts arranged at intervals on the surface form a bite effect with the post-cast concrete, which significantly improves the shear bearing capacity of the node area. Under the action of an earthquake, the steel sections consume energy through plastic deformation, while the bolts can delay the cracking of concrete, forming multiple seismic lines of defense. At the same time, the shear pin + first bolt structure of the present invention cooperates with the bolts through the I-shaped / cross-shaped shear pins pre-embedded in the upper end plate to enhance the shear ductility of the connection between the upper and lower columns, avoid brittle failure, and improve the energy dissipation capacity of the structure.

[0024] 2. The additional shear reinforcement provided in the present invention is connected to the connecting sleeve by threading, and the additional shear reinforcement penetrates into the lower prefabricated column to form a mechanical transmission path similar to an "anchor truss", dispersing the seismic shear force and preventing shear damage in the core area of ​​the node. The node cross reinforcement is arranged between the lower end plate and the lower prefabricated column, and the cross reinforcement is connected to the lower column vertical reinforcement to form a spatial mesh constraint, limit the expansion of concrete cracks, and improve the integrity of the node area.

[0025] 3. In the present invention, the connecting steel section and the concrete wrapping form a "steel-concrete composite section", which has both stiffness and ductility, effectively coordinates the deformation of the upper and lower precast columns, and avoids local damage caused by stress concentration.

[0026] 4. The present invention adopts modular prefabrication and rapid assembly. Key components such as upper and lower end plates, shear-resistant pins, and connecting steel sections are pre-welded and formed in the factory, and are mechanically connected to the vertical steel bars through nuts, reducing the on-site welding workload, reducing human errors. The connecting area formwork adopts a standardized design, which is convenient for installation and disassembly, shortens the formwork support time, and improves the construction speed. At the same time, the vertical steel bars of the upper and lower columns are mechanically anchored to the end plates through pre-welded nuts. Compared with the traditional grouting sleeve process, the curing time of the grouting material is saved, and the connection quality is easier to inspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described in detail below with reference to the drawings.

[0028] Figure 1 is the overall structural schematic diagram of the earthquake-resistant and ductile prefabricated concrete column structure of the present invention.

[0029] Figure 2 is the structural schematic diagram of the bottom of the precast upper end plate of the present invention.

[0030] Figure 3 is the structural schematic diagram of the bottom of the precast lower end plate of the present invention.

[0031] Reference numerals: 1 - upper column vertical steel bar, 2 - lower column vertical steel bar, 3 - shear-resistant pin, 4 - upper end plate, 5 - lower end plate, 6 - node cross bar, 7 - additional shear-resistant bar, 8 - lower precast column, 9 - upper precast column, 10 - second gasket, 11 - connecting sleeve, 12 - first stud, 13 - second stud, 14 - connecting steel section, 15 - first nut, 16 - second nut, 17 - upper column stirrup, 18 - lower column stirrup, 19 - first gasket. DETAILED DESCRIPTION OF THE INVENTION

[0032] As Figures 1-3As shown, this earthquake-proof and ductile precast concrete column structure includes an upper precast column 9 and a lower precast column 8; both the upper precast column 9 and the lower precast column 8 are reinforced concrete columns; it also includes a connecting steel section 14; the bottom of the upper precast column 9 is provided with an upper end plate 4; above the lower precast column 8 is provided with a lower end plate 5, and there is a spacing between the lower end plate 5 and the lower precast column 8; the connecting steel section 14 is connected between the upper end plate 4 and the lower end plate 5, and second stud bolts 13 are arranged at intervals on the outer surface of the connecting steel section 14; concrete or high-strength mortar is poured in the space between the upper end plate 4 and the lower end plate 5; at the top of the upper end plate 4, shear-resistant pin members 3 are arranged inside the upper precast column 9; first stud bolts 12 are arranged at intervals on the outer surface of the shear-resistant pin members 3; the lower end of the upper column vertical reinforcement 1 of the upper precast column 9 passes through the upper end plate 4 and is fixed by a first nut 15; the upper end of the lower column vertical reinforcement 2 of the lower precast column 8 passes through the lower end plate 5 and is fixed by a second nut 16; at the bottom of the lower end plate 5, connecting sleeves 11 are arranged at intervals; additional shear-resistant reinforcement 7 is arranged at intervals in the lower precast column 8, and the upper end of the additional shear-resistant reinforcement 7 is threadedly connected in the connecting sleeve 11, and the lower end of the additional shear-resistant reinforcement 7 extends into the lower precast column 8; beam end reinforcement extends into the space between the lower end plate 5 and the lower precast column 8, and concrete is poured.

[0033] In this embodiment, upper column stirrups 17 are arranged in the upper precast column 9; the upper column stirrups 17 are arranged outside the upper column vertical reinforcement 1; lower column stirrups 18 are arranged in the lower precast column 8; the lower column stirrups 18 are arranged outside the lower column vertical reinforcement 2.

[0034] In this embodiment, first nuts 15 are arranged on both the top surface and the bottom surface of the upper end plate 4, and first washers 19 are padded between the first nuts 15 and the upper end plate 4; second nuts 16 are arranged on both the top surface and the bottom surface of the lower end plate 5, and second washers 10 are padded between the second nuts 16 and the lower end plate 5; In this embodiment, the upper column vertical reinforcement 1 and the lower column vertical reinforcement 2 are arranged corresponding to each other; the upper column vertical reinforcement 1 is fixed on the upper end plate 4 by the first nut 15 and the first washer 19 during factory prefabrication, and the lower column vertical reinforcement 2 is fixed on the lower end plate 5 by the second nut 16 and the second washer 10 during factory prefabrication.

[0035] In this embodiment, joint cross-shaped reinforcement 6 is arranged between the lower end plate 5 and the lower precast column 8; the ends of the joint cross-shaped reinforcement 6 are connected to the lower column vertical reinforcement 2 at the corresponding positions.

[0036] In this embodiment, the upper end plate 4 is welded to the upper precast column 9, the lower end plate 5 is welded to the lower precast column 8; the connecting sleeve 11 is welded to the lower end plate 5.

[0037] In this embodiment, the length of the portion where the lower end of the additional shear reinforcement 7 extends into the lower precast column 8 is adapted to the distance between the lower end plate 5 and the lower precast column 8 .

[0038] In this embodiment, the horizontal cross-section of the shear pin 3 is in the shape of an I-beam, a circle, a rectangle, or a cross; the shear pin 3 is pre-welded to the upper end plate 4 during prefabrication in the factory.

[0039] In this embodiment, the horizontal cross-section shape of the connecting steel section 14 is I-shaped, circular, rectangular or cross-shaped. The connecting steel section 14 is connected to the upper end plate 4 and the lower end plate 5 by groove welding. The connecting steel section 14 is welded to the upper end plate 4 in advance during prefabrication.

[0040] In this embodiment, during factory prefabrication, the connecting sleeve 11 is welded to the bottom of the lower end plate 5 , and the additional shear reinforcement 7 is pre-connected to the connecting sleeve 11 .

[0041] The construction method of this earthquake-resistant and tough prefabricated assembled concrete column structure includes the following steps.

[0042] Step 1: prefabricate the upper prefabricated column 9, the lower prefabricated column 8, the lower end plate 5, the upper end plate 4, the shear pin 3 and the connecting steel section 14, connect the upper end plate 4 and the shear pin 3 together in advance, and embed them into the upper prefabricated column 9.

[0043] Step 2: prefabricate and install the lower prefabricated column 8, the lower end plate 5 and the additional shear reinforcement 7 in place.

[0044] Step three, hoist the upper prefabricated column 9 provided with the upper end plate 4 and the connecting steel section 14, and fix the upper column vertical reinforcement 1 to the upper end plate 4 through the first nut 15, and fix the lower column vertical reinforcement 2 to the lower end plate 5 through the second nut 16.

[0045] Step 4: Connect the connecting steel section 14 to the upper end plate 4 and the lower end plate 5 respectively.

[0046] Step 5: Extend the end steel bars of the beam into the core area of ​​the node between the lower end plate 5 and the lower precast column 8, and pour concrete to complete the installation of the beam and the floor slab. The strength of the poured concrete is not less than that of the precast column.

[0047] Step six, set up the formwork of the area between the upper end plate 4 and the lower end plate 5. The formwork adopts a standardized fixed formwork to facilitate installation and disassembly, and pour concrete or high-strength mortar in the area between the upper end plate 4 and the lower end plate 5. The strength of the poured concrete or high-strength mortar is not lower than the strength of the prefabricated column. The construction is now completed.

[0048] In this embodiment, in step one, when prefabricating the end plate of the precast column 4, the upper end plate 4 is pre-welded to the shear pin member 3; in step two, when prefabricating the lower end plate 5, the connecting sleeve 11 is pre-welded to the lower end plate 5, and the additional shear reinforcement 7 is pre-connected to the connecting sleeve 11; the first nut 15 is pre-welded to the upper end plate 4 during prefabrication and is connected to the vertical reinforcement 1 of the upper column; the second nut 16 is pre-welded to the lower end plate 5 during prefabrication and is respectively connected to the vertical reinforcement 2 of the lower column.

[0049] The above embodiments are not an exhaustive list of specific implementation manners, and there may be other embodiments. The purpose of the above embodiments is to illustrate the present invention, rather than limiting the protection scope of the present invention. All applications obtained by simple changes of the present invention fall within the protection scope of the present invention.

Claims

1. A shock-resistant and ductile prefabricated and assembled concrete column structure, comprising an upper precast column (9) and a lower precast column (8); both the upper precast column (9) and the lower precast column (8) are reinforced concrete columns; characterized in that: It further includes a connecting steel section (14); the bottom of the upper precast column (9) is provided with an upper end plate (4); the upper part of the lower precast column (8) is provided with a lower end plate (5), and there is a spacing between the lower end plate (5) and the lower precast column (8); the connecting steel section (14) is connected between the upper end plate (4) and the lower end plate (5), and second stud bolts (13) are arranged at intervals on the outer surface of the connecting steel section (14); concrete or high-strength mortar is poured in the space between the upper end plate (4) and the lower end plate (5); at the top of the upper end plate (4) and inside the upper precast column (9), shear key members (3) are provided; first stud bolts (12) are arranged at intervals on the outer surface of the shear key members (3); the lower end of the upper column vertical reinforcement (1) of the upper precast column (9) passes through the upper end plate (4) and is fixed by a first nut (15); the upper end of the lower column vertical reinforcement (2) of the lower precast column (8) passes through the lower end plate (5) and is fixed by a second nut (16); connecting sleeves (11) are arranged at intervals at the bottom of the lower end plate (5); additional shear reinforcement bars (7) are arranged at intervals in the lower precast column (8), and the upper ends of the additional shear reinforcement bars (7) are threadedly connected in the connecting sleeves (11), and the lower ends of the additional shear reinforcement bars (7) extend into the lower precast column (8); beam end reinforcement bars extend into the space between the lower end plate (5) and the lower precast column (8), and concrete is poured.

2. The earthquake-resistant and ductile precast assembled concrete column structure according to claim 1, characterized in that: node cross-shaped reinforcement bars (6) are arranged between the lower end plate (5) and the lower precast column (8); the ends of the node cross-shaped reinforcement bars (6) are connected to the lower column vertical reinforcement (2) at the corresponding positions.

3. The earthquake-resistant and ductile precast assembled concrete column structure according to claim 1, characterized in that: the upper end plate (4) is welded to the upper precast column (9), and the lower end plate (5) is welded to the lower precast column (8); the connecting sleeve (11) is welded to the lower end plate (5).

4. The earthquake-resistant and ductile precast assembled concrete column structure according to claim 1, characterized in that: the length of the part where the lower end of the additional shear reinforcement bar (7) extends into the lower precast column (8) is adapted to the spacing between the lower end plate (5) and the lower precast column (8).

5. The earthquake-resistant and ductile precast assembled concrete column structure according to claim 1, characterized in that: the horizontal cross-sectional shape of the shear key member (3) is I-shaped, circular, rectangular or cross-shaped.

6. The earthquake-resistant and ductile precast assembled concrete column structure according to claim 1, characterized in that: the horizontal cross-sectional shape of the connecting steel section (14) is I-shaped, circular, rectangular or cross-shaped, and the connecting steel section (14) is respectively welded to the upper end plate (4) and the lower end plate (5).

7. The earthquake-resistant and ductile precast assembled concrete column structure according to claim 1, characterized in that: the shear key member (3) is pre-welded to the upper end plate (4) during factory prefabrication.

8. A construction method for a seismic toughness prefabricated assembled concrete column structure according to any one of claims 1 to 7, characterized in that it comprises the following steps: Step 1: prefabricate an upper prefabricated column (9), a lower prefabricated column (8), a lower end plate (5), an upper end plate (4), a shear pin (3) and a connecting steel section (14); connect the upper end plate (4) and the shear pin (3) together in advance and embed them into the upper prefabricated column (9); Step 2: prefabricate and install the lower prefabricated column (8), the lower end plate (5) and the additional shear reinforcement (7); Step three, hoisting the upper prefabricated column (9) provided with the upper end plate (4) and the connecting steel section (14), fixing the upper column vertical reinforcement (1) to the upper end plate (4) via a first nut (15), and fixing the lower column vertical reinforcement (2) to the lower end plate (5) via a second nut (16); Step 4: Connect the connecting steel section (14) to the upper end plate (4) and the lower end plate (5) respectively; Step 5: Extend the end steel bars of the beam into the core area of ​​the node between the lower end plate (5) and the lower prefabricated column (8), and pour concrete to complete the installation of the beam and the floor slab; Step 6: Set up the formwork for the area between the upper end plate (4) and the lower end plate (5). The formwork adopts a standardized formwork to facilitate installation and disassembly, and pour concrete or high-strength mortar in the area between the upper end plate (4) and the lower end plate (5). The strength of the poured concrete or high-strength mortar is not less than the strength of the prefabricated column. The construction is now completed.

9. The construction method of the earthquake-proof and toughness prefabricated assembled concrete column structure according to claim 8, characterized in that: In step one, when the end plate of the upper prefabricated column (4) is prefabricated, the upper end plate (4) is pre-welded to the shear pin (3); in step two, when the lower end plate (5) is prefabricated, the connecting sleeve (11) is pre-welded to the lower end plate (5), and the additional shear reinforcement (7) is pre-connected to the connecting sleeve (11); the first nut (15) is pre-welded to the upper end plate (4) during prefabrication, and is connected to the upper column vertical reinforcement (1); the second nut (16) is pre-welded to the lower end plate (5) during prefabrication, and is respectively connected to the lower column vertical reinforcement (2).

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