Precast concrete stand column structure and construction method thereof

Abstract

The invention discloses a prefabricated concrete stand column structure and a construction method thereof.The concrete stand column structure comprises a prefabricated concrete stand column body, a prefabricated pagoda bearing platform and a steel structure bracket used for being assembled with the prefabricated concrete stand column body, and a steel clamping plate is arranged at the position, matched with the steel structure bracket, of the prefabricated concrete stand column body; bolts penetrate through opposite-penetrating screw holes penetrating through the prefabricated concrete stand column body and the steel clamping plate to assemble and connect the steel structure bracket, and bent anchor steel bars used for being matched with mounting holes of the prefabricated pagoda bearing platform are arranged on the prefabricated concrete stand column body in the direction perpendicular to the axis. According to the prefabricated concrete stand column, the steel clamping plates and the prefabricated concrete stand column body are integrally formed, and steel structure brackets of different structures and different specifications can be locked and fixed by arranging bolts in the opposite-penetrating screw holes in a penetrating mode; the prefabricated concrete stand columns can be efficiently machined in batches, and then the production efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a prefabricated concrete column structure and a construction method thereof. Background Art

[0002] The existing single or double corbels of concrete columns must be cast as a whole. Due to the different protrusions and height positions of the corbels, the steel molds of the concrete columns cannot be universal, and centrifugal molding cannot be achieved. A separate molding mold needs to be designed. The production of concrete columns leads to large investments in molds and equipment, and mass production is impossible, resulting in low production efficiency. Summary of the invention

[0003] Technical purpose: In view of the shortcomings of existing concrete column construction, the present invention discloses a precast concrete column structure and a construction method thereof, which can make the steel mold used for the production of precast concrete columns universal and improve the production efficiency of the columns.

[0004] Technical solution: To achieve the above technical objectives, the present invention adopts the following technical solution: A precast concrete column structure comprises a precast concrete column body, a precast pagoda pedestal and a steel structure corbel for assembling with the precast concrete column body, wherein a steel clamp is arranged at a position where the precast concrete column body cooperates with the steel structure corbel, and the steel structure corbel is assembled and connected by inserting bolts into through-screw holes penetrating the precast concrete column body and the steel clamp, and a bent anchor steel bar for cooperating with a mounting hole of the precast pagoda pedestal is arranged on the precast concrete column body in a direction perpendicular to an axis, and a blocking steel bar is arranged in the mounting hole above the bent anchor steel bar, and the lower end of the precast concrete column body is fixed to the mounting hole extending into the precast pagoda pedestal by pouring expansion concrete.

[0005] Preferably, the precast concrete column body of the present invention includes a centrifugally formed layer located on the outer layer and a core-filled concrete layer located on the inner layer, and a partially prestressed composite reinforced steel cage is arranged in the centrifugally formed layer, and the partially prestressed composite reinforced steel cage is composed of prestressed steel bars and threaded steel bars.

[0006] Preferably, the prestressed steel bars of the present invention are arranged at the four corners of the partially prestressed composite reinforcement steel cage, and the threaded steel bars are evenly spaced along the circumference of the centrifugal forming layer.

[0007] Preferably, the steel clamping plate of the present invention is fixed by welding the galvanized steel pipe and a part of the prestressed composite reinforced steel cage, and is cast and formed integrally with the centrifugal forming layer.

[0008] Preferably, the surface structure formed by the plate surface of the steel splint of the present invention and the surface of the precast concrete column body matches the surface structure of the steel structure corbel assembly surface. The assembly surface of the steel structure corbel is a square countersunk hole with a concave middle. When docking, the raised parts around the square countersunk hole are embedded in the groove gap on the precast concrete column body around the steel splint.

[0009] Preferably, a reserved sleeve for blocking the end of a steel bar from passing through is provided in the installation hole of the prefabricated pagoda pedestal of the present invention, and the bent anchor steel bar cooperates with the blocking steel bar to form a blocking structure to withstand the force between the prefabricated concrete column body and the prefabricated pagoda pedestal.

[0010] The invention discloses a construction method based on the above-mentioned precast concrete column structure, which comprises welding and fixing a steel clamping plate and a part of a prestressed composite reinforced steel cage, and placing the steel clamping plate in a hollow square mold, pouring concrete into the square mold for centrifugal molding, and forming a centrifugal molding layer of a precast concrete column body; after the centrifugal molding layer is cured, a secondary pouring is performed in the inner hole to form a core-filling concrete layer, and the precast concrete column body is formed; and the formed precast concrete column body is connected with a steel structure corbel and a precast pagoda cap to form a complete concrete column structure.

[0011] Preferably, during centrifugal forming, the present invention controls the relative position relationship between the steel splint and the inner surface of the hollow square mold, wraps rubber strips on the four sides of the steel splint, removes the wrapped rubber strips on the four sides of the steel splint during centrifugal casting during demolding, and forms groove gaps on the four sides of the steel splint, so that the protruding structure of the steel splint surface matches the square countersunk hole assembly surface of the steel structure corbel.

[0012] Preferably, the partially prestressed composite reinforced steel bar of the present invention is provided with a long sleeve for passing the bent anchor steel bar, the long sleeve is fixed together in the centrifugal forming layer during casting, and the bent anchor steel bar is passed through the long sleeve.

[0013] Preferably, when the precast concrete column body is connected to the precast pagoda pedestal in the present invention, the lower end of the precast concrete column is first extended into the installation hole of the precast pagoda pedestal, and then the blocking steel bar is inserted, and the blocking steel bar is placed above the bent anchor steel bar. After the binding and fixing are complete, the expansion concrete is poured to fix it.

[0014] Beneficial effects: The prefabricated concrete column structure and the construction method thereof disclosed in the present invention have the following beneficial effects: 1. The present invention prefabricates the steel clamp and the precast concrete column body into one piece, and can lock and fix steel structure brackets of different structures and specifications by inserting bolts through the through screw holes, so that the precast concrete columns can be processed in batches efficiently, thereby improving production efficiency.

[0015] 2. The steel cage in the centrifugal forming layer of the present invention uses a partially prestressed composite reinforced steel cage. Through the combination of prestressed steel bars and threaded steel bars, the prestressed steel bars make the formed concrete columns have pre-compressive stress, thereby improving the anti-seepage and anti-cracking properties of the concrete columns. At the same time, threaded steel bars are used as non-prestressed steel bars for reinforcement, thereby improving the toughness of the precast concrete columns and increasing their bending resistance.

[0016] 3. The steel clamping plate of the present invention matches the surface of the precast concrete column and the assembly surface of the steel structure corbel, which can ensure that the surfaces of the butt joints fit after connection and ensure the reliability of the connection.

[0017] 4. The prefabricated pagoda foundation of the present invention is provided with blocking steel bars, which cooperate with the bent anchor steel bars on the prefabricated concrete column body to form a blocking structure, which can achieve pull-out resistance, compression resistance and bending resistance after casting. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0019] Figure 1 This is a schematic diagram of the structure of the precast concrete column of the present invention; Figure 2 For the present invention Figure 1 A partial enlarged view of the middle A area; Figure 3 This is a schematic diagram of the cross-sectional structure of the main body of the precast concrete column of the present invention; Figure 4 This is a schematic diagram of the steel structure corbel structure of the present invention; Figure 5 This is a schematic diagram of the upper end surface structure of the precast concrete column body of the present invention; Among them, 1-precast concrete column body, 2-precast pagoda pedestal, 3-steel structure corbel, 4-steel plywood, 5-through screw holes, 6-bolts, 7-installation holes, 8-bent anchor steel bars, 9-centrifugal forming layer, 10-core filling concrete layer, 11-prestressed steel bars, 12-threaded steel bars, 13-reserved casing, 14-blocking steel bars, 15-square countersunk holes, 16-groove gaps, and 17-rubber strips. DETAILED DESCRIPTION

[0020] Reference will now be made in detail to embodiments of the present disclosure, one or more examples of which are set forth herein below. Each embodiment and example is provided by way of explanation of the apparatus, composition and materials of the present disclosure, rather than limitation. On the contrary, the following description provides a convenient illustration of an exemplary embodiment for implementing the present disclosure. In fact, it will be clear to those skilled in the art that various modifications and variations may be made in the teachings of the present disclosure without departing from the scope or spirit of the present disclosure.

[0021] like Figure 1-Figure 5 As shown, the present invention discloses a precast concrete column structure, comprising a precast concrete column body 1, a precast pagoda cap 2 and a steel structure corbel 3 for assembling with the precast concrete column body 1, wherein the precast concrete column body 1 is provided with a steel clamp 4 at the position where the steel structure corbel 3 is matched, and the steel structure corbel 3 is assembled and connected by inserting bolts 6 in through-screw holes 5 penetrating the precast concrete column body 1 and the steel clamp 4, and a bent anchor steel bar 8 for matching with a mounting hole 7 of the precast pagoda cap 2 is arranged on the precast concrete column body 1 in a direction perpendicular to the axis, and the mounting hole 7 is provided with a blocking steel bar 14 inserted above the bent anchor steel bar 8, and the lower end of the precast concrete column body 1 is fixed to the mounting hole 7 extending into the precast pagoda cap 2 by pouring expansion concrete; and anchor bolts or other embedded parts can also be arranged at the upper end of the precast concrete column body 1 during centrifugal forming according to needs to connect other assembly parts.

[0022] like Figure 3 and Figure 4 As shown, the precast concrete column body 1 of the present invention includes a centrifugal forming layer 9 located at the outer layer and a core-filling concrete layer 10 located at the inner layer. The precast solid concrete column structure is formed by secondary pouring in the hollow part after the concrete column is centrifugally formed, which can greatly increase the vertical pressure bearing, bending and shearing resistance of the precast concrete column. In particular, after the bracket is assembled, the solid column can better withstand the load when the crane on the bracket is running; in order to further improve the structural strength of the precast concrete column, the present invention arranges a partial prestressed composite reinforced steel cage in the centrifugal forming layer 9, and the partial prestressed composite reinforced steel cage is composed of prestressed steel bars 11 and threaded steel bars 12, wherein the prestressed steel bars 11 are arranged at the four corners of the partial prestressed composite reinforced steel cage, and the threaded steel bars 12 are evenly spaced along the circumference of the centrifugal forming layer. During centrifugal forming, the prestressed steel bars are tensioned, so that the concrete structure after curing after forming itself has precompressive stress, and the threaded steel bars 12 can improve the toughness of the precast concrete column structure after reinforcement, and enhance the bending resistance.

[0023] The steel clamping plate 4 is welded and fixed to a part of the prestressed composite reinforced steel cage by a galvanized steel pipe 13, and is cast and formed integrally with the centrifugal forming layer 9 simultaneously, and the surface structure formed on the plate surface of the steel clamping plate 4 and the surface of the precast concrete column body 1 matches the surface structure of the steel structure bracket 3 assembly surface. In the embodiment of the present invention, Figure 2 and Figure 4 As shown, the assembly surface of the steel structure corbel 3 is a square countersunk hole 15 with a concave center. When docking, the raised parts around the square countersunk hole 15 are embedded in the groove gap 16 on the precast concrete column body 1 around the steel plywood 4, so as to realize the constraint on the surrounding of the docking surface, so as to enhance the stability of the structure after connection and improve the shear, compression and bending resistance of the corbel; in order to facilitate the processing of the groove gap 16 and reduce the workload, the present invention is achieved by coating the rubber strip 16 on the outer periphery of the steel plywood 4 during centrifugal molding, and the rubber strip only needs to be removed when demolding.

[0024] The mounting hole 7 of the prefabricated pagoda cap 2 of the present invention is correspondingly provided with a reserved sleeve 13 for the end of the blocking steel bar 14 to penetrate. The bent anchor steel bar 8 cooperates with the blocking steel bar 14 to form a blocking structure to withstand the force between the prefabricated concrete column main body 1 and the prefabricated pagoda cap 2. The length of the blocking steel bar 14 is less than the interval between the reserved sleeves 13 in the prefabricated pagoda cap 2, so that after the column is installed in the prefabricated pagoda cap 2, the blocking steel bar 14 can be strung into the two reserved sleeves 13 of the prefabricated pagoda cap 2 from the side of the column; since the gap between the column and the mounting hole 7 is small after the column is installed, the blocking steel bar 14 cannot be directly put in by hand. For the convenience of operation, a handle that is easy to operate is provided on the blocking steel bar 14 of the present invention, and an operating rod is preferably provided in a direction perpendicular to the blocking steel bar 14. By using the handle formed by the operating rod, the installer can smoothly install the blocking steel bar 14, and it is also convenient to adjust the position of the blocking steel bar 14 and the subsequent binding and fixing, so as to avoid the subsequent dislocation of the blocking steel bar 14 and affect the effect.

[0025] The invention discloses a construction method based on the above-mentioned precast concrete column structure, which comprises welding and fixing a steel clamping plate and a part of a prestressed composite reinforced steel cage, and placing the steel clamping plate in a hollow square mold, pouring concrete into the square mold for centrifugal molding, and forming a centrifugal molding layer of a precast concrete column body. During the centrifugal molding process, a centrifuge is used to drive the hollow square mold for high-speed centrifugal molding, and then steam curing is performed to demould after the demoulding strength is reached. This is a mature processing technology and will not be described in detail in the invention. Then, secondary pouring is performed in the inner hole of the centrifugal molding layer to form a core-filling concrete layer to form a precast concrete column body. The formed precast concrete column body is connected with a steel structure corbel and a precast pagoda cap to form a complete precast concrete column structure.

[0026] The present invention controls the relative position relationship between the steel splint and the inner surface of the hollow square mold during centrifugal forming, wraps rubber strips on the four sides of the steel splint, removes the wrapped rubber strips on the four sides of the steel splint during centrifugal casting during demolding, forms groove gaps on the four sides of the steel splint, and makes the protruding structure of the steel splint surface match the square countersunk hole assembly surface of the steel structure corbel.

[0027] Part of the prestressed composite reinforced steel cage is provided with a long sleeve for passing the bent anchor steel bars. The long sleeve is fixed together in the centrifugal forming layer during pouring. The bent anchor steel bars are passed through the long sleeve. When connecting the precast concrete column body with the precast pagoda cap, first insert the lower end of the concrete column into the reserved long sleeve with the bent anchor steel bar, and extend it into the installation hole of the precast pagoda cap and adjust the column elevation and verticality. You can insert the L-shaped steel plate gasket into the bottom of the column for adjustment, then place the blocking steel bar with a handle above the bent anchor steel bar, tie the handle of the blocking steel bar to fix the blocking steel bar, and after completion, pour expansive concrete to fix it, forming a solid integrated structure of precast column and cap assembly, enhancing the structural strength of the connection, and achieving pull-out resistance, compression resistance, and bending resistance.

[0028] The precast concrete column structure of the present invention can use a standardized precast concrete column steel mold, and through a centrifugal molding production process, assemble steel structure corbels and precast concrete columns, so that the production of precast concrete columns is not limited to the corbel structure, and can be assembled through embedded steel clamps and reserved through-screw holes, thereby improving production efficiency and reducing equipment and mold investment costs.

Claims

1. A prefabricated concrete column structure, characterized in that: The invention comprises a precast concrete column body (1), a precast pagoda pedestal (2), and a steel structure bracket (3) for assembling with the precast concrete column body (1). The precast concrete column body (1) is provided with a steel clamp (4) at the position where it cooperates with the steel structure bracket (3). The steel structure bracket (3) is assembled and connected by inserting bolts (6) into through-screw holes (5) penetrating the precast concrete column body (1) and the steel clamp (4). A bent anchor steel bar (8) for cooperating with a mounting hole (7) of the precast pagoda pedestal (2) is arranged on the upper side of the precast concrete column body (1) in a direction perpendicular to the axis. The mounting hole (7) is provided with a blocking steel bar (14) inserted above the bent anchor steel bar (8). The lower end of the precast concrete column body (1) is fixed to the mounting hole (7) extending into the precast pagoda pedestal (2) by pouring expansion concrete.

2. A precast concrete column structure according to claim 1, characterized in that: The precast concrete column body (1) comprises a centrifugally formed layer (9) located at an outer layer and a core-filled concrete layer (10) located at an inner layer, and a partially prestressed composite reinforced steel cage is arranged in the centrifugally formed layer (9), wherein the partially prestressed composite reinforced steel cage is composed of prestressed steel bars (11) and threaded steel bars (12).

3. The precast concrete column structure according to claim 2, characterized in that: The prestressed steel bars (11) are arranged at the four corners of the partially prestressed composite reinforcement steel cage, and the threaded steel bars (12) are evenly spaced and arranged along the circumference of the centrifugal forming layer.

4. The precast concrete column structure according to claim 2, characterized in that: The steel clamping plate (4) is welded and fixed to a portion of the prestressed composite reinforced steel cage through a galvanized steel pipe (13), and is cast and formed integrally with the centrifugal forming layer (9) simultaneously.

5. The precast concrete column structure according to claim 4, characterized in that: The surface structure formed by the plate surface of the steel clamp (4) and the surface of the precast concrete column body (1) matches the surface structure of the assembly surface of the steel structure bracket (3); the assembly surface of the steel structure bracket (3) is a square countersunk hole (15) with a concave center, and when docking, the raised parts around the square countersunk hole (15) are embedded in the groove gap (16) on the precast concrete column body (1) around the steel clamp (4).

6. The precast concrete column structure according to claim 1, characterized in that: A reserved sleeve (13) for the end of the blocking steel bar (14) to penetrate is correspondingly arranged in the mounting hole (7) of the prefabricated pagoda pedestal (2), and the bent anchor steel bar (8) cooperates with the blocking steel bar (14) to form a blocking structure to withstand the action force between the prefabricated concrete column body (1) and the prefabricated pagoda pedestal (2).

7. A construction method of a precast concrete column structure according to any one of claims 1 to 6, characterized in that: The steel splint is welded and fixed to a part of the prestressed composite reinforced steel cage, and placed in a hollow square mold, and concrete is poured into the square mold for centrifugal molding to form a centrifugal molding layer of the precast concrete column body; then after the centrifugal molding layer is cured, a secondary pouring is performed in the inner hole of the centrifugal molding layer to form a core-filling concrete layer to form the precast concrete column body; the formed precast concrete column body is connected to the steel structure corbel and the precast pagoda cap to form a complete concrete column structure.

8. The construction method of a precast concrete column structure according to claim 7, characterized in that: During centrifugal forming, the relative position relationship between the steel plywood and the inner surface of the hollow square mold is controlled, and rubber strips are wrapped around the four sides of the steel plywood. When demolding, the rubber strips wrapped around the four sides of the steel plywood during centrifugal casting are removed to form groove gaps on the four sides of the steel plywood, so that the protruding structure of the steel plywood surface matches the square countersunk assembly surface of the steel structure corbel.

9. The construction method of a precast concrete column structure according to claim 7, characterized in that: The partially prestressed composite reinforced steel bar is provided with a long sleeve for passing through the bent anchor steel bar, the long sleeve is fixed together in the centrifugal forming layer during pouring, and the bent anchor steel bar is passed through the long sleeve.

10. The construction method of a precast concrete column structure according to claim 7, characterized in that: When connecting the main body of the precast concrete column with the precast pagoda pedestal, first extend the lower end of the concrete column into the installation hole of the precast pagoda pedestal, then insert the blocking steel bar, place the blocking steel bar above the bent anchor steel bar, and after tying and fixing it completely, pour the expansion concrete to fix it.

Images