New connecting and fixing structure suitable for precast columns and implementation method for new connecting and fixing structure

Abstract

Provided in the present invention is a new connecting and fixing structure suitable for precast columns. The new connecting and fixing structure comprises a lower-layer precast column, an upper-layer precast column and an L-shaped fixing bracket, wherein a column cap connected to a frame beam is provided at the top of the lower-layer precast column; a cup-mouth-shaped recess is formed in the top of the column cap; the upper-layer precast column is fixed to an upper surface of the column cap by means of the L-shaped fixing bracket; a reinforcing bar at the bottom of the upper-layer precast column extends into the cup-mouth-shaped recess and is in lap joint with a reinforcing bar at the top of the lower-layer precast column; the edge of a gap between the upper-layer precast column and the column cap is blocked with blocking mortar; fine aggregate concrete with one grade higher than the concrete grade of a precast column is poured in the cup-mouth-shaped recess to a floor level elevation; the gap between the upper-layer precast column and the column cap is filled with a grouting material; and upper surfaces of the upper-layer precast column and the column cap are both connected to the L-shaped fixing bracket by means of bolts, and threaded sleeve metal members fitting with the bolts are pre-buried in the upper-layer precast column and the column cap. Further provided in the present invention is an implementation method for the new connecting and fixing structure suitable for precast columns.

Description

A new connection and fixing structure suitable for prefabricated columns and its implementation method Technical Field

[0001] The present invention relates to the field of construction, and in particular to a novel connection and fixing structure suitable for prefabricated columns and an implementation method thereof. Background Art

[0002] The existing conventional connection method between the upper prefabricated columns and the lower prefabricated columns is sleeve grouting connection. Sleeve grouting connection is not only cumbersome to operate, large in construction volume, and difficult to connect, but also difficult to control the quality and inspection of grouting in the sleeve, and the construction pass rate is not high enough. In addition, a large number of grouting sleeves are required. In order to make the construction simpler and more convenient, it is necessary to design a new connection and fixing structure suitable for prefabricated columns to overcome the above problems.

[0003] Summary of the Invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a new connection and fixing structure suitable for prefabricated columns and an implementation method thereof. The present invention at least solves some of the problems in the prior art.

[0005] The present invention is achieved in that:

[0006] The present invention provides a novel connection and fixing structure suitable for prefabricated columns, comprising a lower prefabricated column, an upper prefabricated column, and an L-shaped fixing base, wherein the top of the lower prefabricated column is provided with a column cap connected to the frame beam, and the top of the column cap is provided with a cup-mouth groove, and the upper prefabricated column is fixed to the upper surface of the column cap through the L-shaped fixing base, and the steel bar at the bottom of the upper prefabricated column extends into the cup-mouth groove and is overlapped and connected with the steel bar at the top of the lower prefabricated column, and the edge of the gap between the upper prefabricated column and the column cap is sealed with sealing mortar, and the cup-mouth groove is poured with fine stone concrete one grade higher than the concrete grade of the prefabricated column to the floor surface elevation, and the gap between the upper prefabricated column and the column cap is filled with grouting material, and the upper surfaces of the upper prefabricated column and the column cap are both connected to the L-shaped fixing base by bolts, and the upper prefabricated column and the column cap are pre-embedded with threaded sleeve metal parts that match the bolts.

[0007] Furthermore, the upper prefabricated columns and the lower prefabricated columns are both rectangular columns.

[0008] Furthermore, each side wall of the upper prefabricated column is fixed to the upper surface of the column cap using an L-shaped fixing bracket.

[0009] Furthermore, grouting pipes and exhaust pipes are provided on the upper prefabricated columns.

[0010] Furthermore, part of the steel bars of the frame beam pass through the cup-mouth groove.

[0011] Furthermore, a slot is provided on the top of the column cap for the top steel bars of the frame beam to pass through directly. A limiting steel bar is provided in the slotted area of ​​the column cap. The limiting steel bar is embedded in the column cap. The limiting steel bar and the bottom surface of the slotted area form a rectangular ring hole for the top steel bars of the frame beam to pass through.

[0012] Furthermore, a frame beam is constructed and a slope is reserved near the limiting steel bar for pouring fine stone concrete into the cup-mouth groove, and the bottom of the slope is connected to the bottom surface of the grooved area; then, the upper prefabricated column is fixed to the upper surface of the column cap by an L-shaped fixing bracket; then the cup-mouth groove is poured, and the fine stone concrete flows through the slope to the rectangular ring hole and further flows into the cup-mouth groove, and is poured to the floor surface elevation. After the cup-mouth groove is poured, the slope reserved in the frame beam is also poured to the floor surface elevation, flush with the upper surface of the column cap; then the gap between the upper prefabricated column and the column cap is filled through the grouting pipe.

[0013] The present invention has the following beneficial effects:

[0014] 1. The present invention provides a new connection and fixing structure suitable for prefabricated columns, which saves grouting sleeve connectors and avoids the construction difficulty caused by inaccurate positioning of steel bar holes and embedded steel bars when installing grouting sleeve prefabricated columns. It has simple construction, good structural stability, and a high construction qualification rate. It can be used as a new way to connect upper prefabricated columns with lower prefabricated columns.

[0015] 2. Column caps are provided on the tops of the lower precast columns. The setting of the column caps strengthens the performance of the beam-column joints, improves the structural reliability, and realizes on-site grouting-free sleeve pouring of concrete, solving the problem of connecting the longitudinal reinforcement of the upper and lower precast columns. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] FIG1 is a schematic diagram of a novel connection and fixing structure for prefabricated columns provided by an embodiment of the present invention; a cross-sectional view

[0018] FIG2 is an enlarged view of the upper left corner of FIG1 provided by an embodiment of the present invention;

[0019] FIG3 is an enlarged view of the upper right corner of FIG1 provided by an embodiment of the present invention;

[0020] FIG4 is an enlarged view of the middle portion of FIG1 provided in an embodiment of the present invention;

[0021] FIG5 is a schematic diagram of an L-shaped fixed base provided in an embodiment of the present invention;

[0022] FIG6 is a side view of an L-shaped fixed base provided in an embodiment of the present invention;

[0023] FIG7 is a top view of an L-shaped fixed base provided in an embodiment of the present invention;

[0024] FIG8 is a cross-sectional view taken along line AA in FIG1 according to an embodiment of the present invention;

[0025] FIG9 is a cross-sectional view taken along line BB in FIG1 according to an embodiment of the present invention;

[0026] FIG10 is a CC cross-sectional view of FIG9 provided in an embodiment of the present invention;

[0027] FIG11 is an enlarged view of the upper portion of FIG10 provided in an embodiment of the present invention.

[0028] In the figure: lower precast column 1, column cap 2, cup groove 3, upper precast column 4, L-shaped fixing base 5, steel bar at the bottom of upper precast column 6, steel bar at the top of lower precast column 7, sealing mortar 8, grouting pipe 9, exhaust pipe 10, bolt 11, threaded sleeve metal fitting 12, beam bottom reinforcement 13, threaded sleeve 14, first row of frame beam reinforcement 15, second row of frame beam reinforcement 16, slotted area 17, keyway 18, torsional reinforcement 19, reinforcement hole 20, frame beam stirrup 21, precast column hook 22, cup groove outline 23, upper surface of column cap 24, frame beam 25, projection area of ​​the lower half of the frame beam 26, edge line of upper precast column 27. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] As shown in Figures 1 to 11, an embodiment of the present invention provides a new connection and fixing structure suitable for prefabricated columns. A column cap 2 is provided on the top of the lower prefabricated column 1. The setting of the column cap strengthens the performance of the beam-column node, improves the structural reliability, and realizes on-site grouting-free sleeve pouring of concrete, solving the connection problem of the longitudinal reinforcement of the upper and lower prefabricated columns. A cup-mouth groove 3 is provided in the middle position of the top of the column cap 2, and the upper prefabricated column 4 is fixed to the upper surface 24 of the column cap by an L-shaped fixing socket 5. The steel bar 6 at the bottom of the upper prefabricated column extends into the cup-mouth groove 3 and is overlapped and connected with the steel bar 7 at the top of the lower prefabricated column. The steel bar 7 at the top of the lower prefabricated column also extends into the cup-mouth groove 3.

[0031] The upper prefabricated column 4 is placed on the upper surface 24 of the column cap. There is inevitably a gap between the upper prefabricated column 4 and the column cap 2. The gap between the upper prefabricated column 4 and the column cap 2 is filled with grouting material. Before filling the grouting material, the edge of the gap between the upper prefabricated column 4 and the column cap 2 is sealed with sealing mortar 8. A grouting pipe 9 and an exhaust pipe 10 are provided on the upper prefabricated column 4. The gap between the upper prefabricated column 4 and the column cap 2 is connected to the grouting pipe 9. The gap between the upper prefabricated column 4 and the column cap 2 and the cup groove 3 are all connected to the exhaust pipe 10. In this embodiment, the bottom of the upper prefabricated column 4 is reserved for upward The arched space, the grouting pipe 9 and the exhaust pipe 10 are all connected to the upwardly arched space, and the gap between the upper prefabricated column 4 and the column cap 2 is connected to the upwardly arched space; the L-shaped fixing bracket 5 plays a temporary fixing role on the upper prefabricated column 4, and when the grouting material in the gap between the upper prefabricated column 4 and the column cap 2 is finally solidified, the L-shaped fixing bracket 5 can be retrieved and reused; in this embodiment, the upper prefabricated column 4 and the lower prefabricated column 1 are both rectangular columns, and an L-shaped fixing bracket 5 is used on each side. Only four L-shaped fixing brackets 5 are required to better fix the upper prefabricated column 4.

[0032] In this embodiment, the upper prefabricated columns 4 and the lower prefabricated columns 1 are connected to the L-shaped fixing base 5 by bolts 11, and threaded sleeve metal parts 12 that cooperate with the bolts 11 are pre-embedded in the upper prefabricated columns 4 and the lower prefabricated columns 1.

[0033] The column cap 2 is a rectangular column, and the four side walls of the column cap 2 are connected to a frame beam 25. To ensure the stability of the connection between the column cap and the frame beam, a number of beam bottom bars 13 are embedded in the bottom of the column cap 2. A number of threaded sleeves 14 are provided in the frame beam 25, and each threaded sleeve 14 is for a beam bottom bar 13 to pass through.

[0034] The top of the column cap 2 is provided with a slot for the top reinforcement of the frame beam (the first row of reinforcement 15 of the frame beam and the second row of reinforcement 16 of the frame beam) to pass directly through. FIG9 shows a slotted area 17 for the top reinforcement of the frame beam to pass through. Below the slotted area 17 is a projection area 26 of the lower half of the frame beam. Two keyways 18 (the keyway depth is 30 mm) are provided in the middle of each side wall of the column cap 2. When the frame beam is cast, the concrete of the frame beam penetrates into the keyway 18, making the connection between the frame beam 25 and the column cap 2 more firmly. The torsional reinforcement in the middle of the frame beam 25 19 passes through the column cap 2 from the keyway 18, and the side wall of the column cap 2 is reserved with a steel bar hole 20 for the torsional reinforcement 19 to pass through. The first row of steel bars 15 of the frame beam, the second row of steel bars 16 of the frame beam and the torsional reinforcement 19 all pass through the cup groove 3 of the column cap. The fine stone concrete cast in the cup groove 3 is one grade higher than the concrete grade of the precast column, so that the steel bars 6 at the bottom of the upper precast column, the steel bars 7 at the top of the lower precast column, the first row of steel bars 15 of the frame beam, the second row of steel bars 16 of the frame beam and the torsional reinforcement 19 in the middle of the frame beam are anchored in the cup groove 3. A number of frame beam stirrups 21 are also provided in the column cap 2. Preferably, the slotted area of ​​the column cap is provided with a limiting reinforcement, which is embedded in the column cap. The limiting reinforcement (in the shape of a door frame) and the bottom surface of the slotted area enclose a rectangular ring hole for the top reinforcement of the frame beam to pass through. The second embodiment of the present invention provides an implementation method for a new connection and fixing structure suitable for prefabricated columns: a frame beam 25 is constructed and a slope is reserved for pouring fine stone concrete into the cup-mouth groove 3 near the limiting steel bar on the frame beam 25, and the bottom of the slope is connected to the bottom surface of the grooved area; then, the upper prefabricated column 4 is fixed to the upper surface of the column cap through the L-shaped fixing bracket 5; then the cup-mouth groove 3 is poured, and the fine stone concrete flows through the slope to the rectangular ring hole and further flows into the cup-mouth groove 3, and is poured to the floor surface elevation. After the cup-mouth groove 3 is poured, the slope reserved by the frame beam 25 is also poured to the floor surface elevation, flush with the upper surface of the column cap 2; then the gap between the upper prefabricated column 4 and the column cap 2 is filled through the grouting pipe 9.

[0035] In this embodiment, the limiting steel bars are realized by using frame beam stirrups 21. The frame beam stirrups 21 include several parallel rectangular frames. The bottom of the rectangular frame is embedded in the column cap 2, and the top of the rectangular frame is exposed in the slotted area of ​​the column cap in the shape of a door frame. The top of the rectangular frame and the bottom of the slotted area form a rectangular ring hole for the top steel bars of the frame beam to pass through.

[0036] The lower prefabricated column 1 is also provided with a prefabricated column hook 22 in the cup-mouth groove. Some reinforcement bars of the frame beam run through the cup-mouth groove, i.e., some reinforcement bars of the frame beam run through the cup-mouth groove both sides and are pulled through to be arranged.

[0037] The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A new type of connection and fixing structure suitable for prefabricated columns, characterized in that: It comprises a lower prefabricated column, an upper prefabricated column and an L-shaped fixed socket. The top of the lower prefabricated column is provided with a column cap connected to the frame beam, and the top of the column cap is provided with a cup-mouth groove. The upper prefabricated column is fixed to the upper surface of the column cap through the L-shaped fixed socket. The steel bar at the bottom of the upper prefabricated column extends into the cup-mouth groove and is overlapped and connected with the steel bar at the top of the lower prefabricated column. The edge of the gap between the upper prefabricated column and the column cap is sealed with sealing mortar. The cup-mouth groove is poured with fine stone concrete one grade higher than the concrete grade of the prefabricated column to the floor elevation. The gap between the upper prefabricated column and the column cap is filled with grouting material. The upper surfaces of the upper prefabricated column and the column cap are connected to the L-shaped fixed socket by bolts. The upper prefabricated column and the column cap are pre-embedded with threaded sleeve metal parts matching the bolts.

2. The novel connection and fixing structure applicable to prefabricated columns as claimed in claim 1 is characterized in that: The upper precast columns and the lower precast columns are both rectangular columns.

3. The novel connection and fixing structure applicable to prefabricated columns as claimed in claim 2 is characterized in that: Each side wall of the upper prefabricated column is fixed to the upper surface of the column cap using an L-shaped fixing bracket.

4. The novel connection and fixing structure applicable to prefabricated columns as claimed in claim 1 is characterized in that: The upper prefabricated columns are provided with grouting pipes and exhaust pipes.

5. The novel connection and fixing structure applicable to prefabricated columns as claimed in claim 1 is characterized in that: Part of the steel bars of the frame beam penetrate through the cup-mouth groove.

6. The novel connection and fixing structure applicable to prefabricated columns as claimed in claim 1 is characterized in that: A slot is provided at the top of the column cap for the top steel bars of the frame beam to pass directly through. A limiting steel bar is provided in the slotted area of ​​the column cap. The limiting steel bar is embedded in the column cap. The limiting steel bar and the bottom surface of the slotted area enclose a rectangular ring hole for the top steel bars of the frame beam to pass through.

7. A method for implementing a new type of connection and fixing structure suitable for prefabricated columns, characterized in that: A frame beam is constructed and a slope is reserved near the limit steel bar for pouring fine stone concrete into the cup-mouth groove, and the bottom of the slope is connected to the bottom surface of the grooved area; then, the upper prefabricated column is fixed to the upper surface of the column cap by an L-shaped fixing bracket; then, the cup-mouth groove is poured, and the fine stone concrete flows through the slope to the rectangular ring hole and further flows into the cup-mouth groove, and is poured to the floor surface elevation. After the cup-mouth groove is poured, the slope reserved in the frame beam is also poured to the floor surface elevation, flush with the upper surface of the column cap; then, the gap between the upper prefabricated column and the column cap is filled through a grouting pipe.

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