A column cap for a flat slab joint and its layout method

Abstract

The present invention discloses a column cap for a flat slab joint, which includes cross beams and edge beams; the cross position of the cross beams is arranged at the upper end of the column of the flat slab joint, and a circle of edge beams is arranged around the cross beams, and the edge beams are fixedly connected to the ends of the cross beams far from the cross position; a plurality of holes are formed between the cross beams and the edge beams; the cross position of the cross beams coincides with the geometric center of the edge beams. In view of the difficulties in the construction of the concealed beam at the joint and the inconvenience in the layout of the vertical pipeline lines in the flat slab layout mode, the present invention provides a beam-type column cap and a layout mode of the flat slab joint with holes provided in the column cap, and the vertical layout problem of the pipeline lines can be solved through the holes; at the same time, due to the existence of the beams, the punching failure form of the flat slab is transformed into a shear failure form with a mature calculation formula, and the safety of the flat slab joint is improved by ensuring the shear resistance of the structure.

Description

Technical Field

[0001] The present invention relates to the field of construction engineering, and particularly relates to a column cap for a flat slab floor node and a layout method thereof. Background Art

[0002] The flat slab floor is a widely used structural form in construction engineering. It can mainly increase the clear height or reduce the storey height. The comprehensive economic benefit is better than that of the traditional beam-slab structure, and it has the characteristic of a direct force transmission path, so it is widely used in the underground garage structure.

[0003] The flat slab floor node is generally composed of a slab and a column, but punching failure is likely to occur at the node, and then progressive collapse may occur, causing significant losses. At the same time, in the flat slab floor structure, it is not easy to arrange vertical pipeline lines.

[0004] In view of these problems, the existing technologies mainly set a bracket or a concealed beam at the node to prevent damage. However, the construction of the concealed beam has certain difficulties and is easily overlooked, and the problem of troublesome arrangement of vertical pipeline lines has not been solved yet. Summary of the Invention

[0005] The purpose of the present invention is to overcome the shortcomings and deficiencies of the existing technologies, and provide a column cap for a flat slab floor node. In view of the difficulties in the construction of the concealed beam at the node and the inconvenience of arranging vertical pipeline lines in the flat slab floor layout, the present invention provides a beam-type column cap and a layout method of a flat slab floor node with holes provided in the column cap, which can solve the problem of vertical arrangement of pipeline lines through the holes; at the same time, due to the existence of the beam, the punching failure form of the flat slab floor is transformed into a shear failure form with a mature calculation formula, and the safety of the flat slab floor node is improved by ensuring the shear resistance of the structure.

[0006] Another purpose of the present invention is to provide a layout method of a column cap for a flat slab floor node.

[0007] The purpose of the present invention is achieved by the following technical solutions:

[0008] A column cap for a flat slab floor node includes cross beams and side beams; the cross position of the cross beams is set at the upper end of the column of the flat slab floor node, a circle of side beams is arranged outside the cross beams, and the side beams are fixedly connected to the ends of the cross beams far from the cross position; a plurality of holes are formed between the cross beams and the side beams; the cross position of the cross beams coincides with the geometric center of the side beams.

[0009] Preferably, the cross beams are cross-shaped cross beams, the side beams are square-shaped side beams, the cross beams and the side beams form a field shape, and four holes are formed between the cross beams and the side beams.

[0010] Preferably, a concealed beam extending outward is provided at the connection between the cross beam and the side beam, and the concealed beam is arranged in the floor slab connected to the side beam.

[0011] Preferably, the holes are used for vertically arranging pipeline lines, or a layer of sealing plate is provided on the outer surface of the holes. When some reserved holes do not need to vertically arrange pipeline lines, they are integrally sealed with a sealing plate (thin plate) not exceeding the thickness of the floor slab; when some reserved holes vertically arranging pipeline lines do not require such a large hole space, they can also be partially sealed with a sealing plate (thin plate) not exceeding the thickness of the floor slab.

[0012] Preferably, the cross beam is an X-shaped cross beam.

[0013] Preferably, the cross beam is a cross-shaped cross beam.

[0014] Preferably, the side beam is in a regular shape, and the regular shape includes a circle, an ellipse, a rhombus, and a regular polygon.

[0015] Preferably, the height of the side beam is not greater than the height of the cross beam.

[0016] Preferably, the width of the cross beam is not greater than the width of the column at the joint of the flat slab floor.

[0017] Another object of the present invention is achieved by the following technical solution:

[0018] A method for arranging column caps at joints of flat slab floors, comprising the following steps:

[0019] S1. First, fix the formwork of the column cap on the column at the joint of the flat slab floor;

[0020] S2. Then, bind the steel reinforcement cages of the cross beam and the side beam and place them at the designated positions, set baffles around the holes, and then carry out concrete pouring; if holes are not needed, they are sealed with a sealing plate not exceeding the thickness of the floor slab, and finally a reinforced concrete beam-type column cap is formed.

[0021] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0022] 1. Compared with the existing general flat slab floor, by providing beam-type column caps, the punching failure form of the flat slab floor is effectively converted into a shear failure form with a mature calculation formula, and the safety of the joints of the flat slab floor is improved by ensuring the shear resistance of the structure.

[0023] 2. Compared with the existing general frame beam floor, the present invention retains the joints of the flat slab floor, ensures the clear height of the floor slab outside the joints, and effectively compresses the structural height.

[0024] 3. Compared with the existing general flat slab floor, the present invention provides holes at the flat slab floor joints, which facilitates the vertical layout of pipeline routes, reduces the workload of on-site pipeline layout, and shortens the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 FIG. is a top view sectional view of a column cap for a flat slab floor joint according to the present invention, and the column cap is not connected to the surrounding floor slab.

[0026] Figure 2 FIG. is a top view sectional view of a column cap for a flat slab floor joint according to the present invention, and the column cap is connected to the surrounding floor slab.

[0027] Figure 3 is Figure 2 sectional view A-A of.

[0028] Figure 4 is Figure 2 sectional view B-B of.

[0029] Among them, the meanings of the reference numerals are as follows:

[0030] 1 - grid-shaped beam column cap, 2 - column of flat slab floor joint, 3 - cross beam, 4 - side beam, 5 - hole, 6 - concealed beam, 7 - floor slab. SPECIFIC EMBODIMENTS

[0031] The present invention will be further described in detail below in conjunction with the embodiments and the drawings, but the embodiments of the present invention are not limited thereto.

[0032] Referring to Figures 1-4 , a column cap for a flat slab floor joint, the column cap is a grid-shaped beam column cap 1, and the grid-shaped beam column cap 1 includes a cross beam 3 provided at the upper end of a column 2 of a flat slab floor joint and a circle of side beams 4 surrounding the beam ends of the cross beam, and four holes 5 are formed between the cross beam 3 and the side beams 4. The side beam 4 is in a square shape, and the cross beam 3 and the side beams 4 form a grid shape.

[0033] According to the construction requirements, in the floor slab 7 connected to the grid-shaped beam column cap 1, a concealed beam 6 should be provided along the direction of the cross beam 3.

[0034] The cross-sectional areas, spacings and positions of the longitudinal bars and stirrups of the cross beam 3 and the side beams 4 should comply with the provisions of the "Code for Design of Concrete Structures" (GB50010-2010), the "Code for Seismic Design of Building Structures" (GB50011-2010), and the "Technical Specification for Concrete Structures of High-rise Buildings" (JGJ3-2010).

[0035] When it is not necessary to leave holes at some of the reserved holes 5, they are blocked with a blocking plate not exceeding the thickness of the floor slab.

[0036] The width of the side beam 4 is not less than 300 mm.

[0037] The height of the side beam 4 is not greater than the height of the cross beam 3.

[0038] When the flat slab joint is fabricated on site, first fix the formwork of the grid-shaped beam column cap 1 to the column 2 of the flat slab joint, then bind the reinforcement cages of the cross beam 3 and the side beam 4 and place them at the designated position. Baffles can be set around the hole 5, and then concrete is poured. If the hole 5 is not needed, it is blocked with a blocking plate not exceeding the thickness of the floor slab, and finally a reinforced concrete grid-shaped beam column cap 1 is formed. By setting the grid-shaped beam column cap, the punching failure form of the flat slab is effectively transformed into a shear failure form with a mature calculation formula, and the safety of the flat slab joint is improved by ensuring the shear resistance of the structure; the net height of the structure is ensured; holes are reserved to facilitate the layout of pipelines and lines along the vertical direction of the structure, reducing the workload of laying pipelines and lines, and achieving the effect of shortening the construction period.

[0039] In the above embodiment, the cross beam and the square frame form a grid-shaped beam column cap, which is the optimal implementation scheme of the present invention, facilitating construction and having direct force transmission.

[0040] However, the shapes of the cross beam and the frame are not limited to this, as long as the intersection position of the cross beam coincides with the geometric center of the side beam:

[0041] The shape of the cross beam can be formed by the intersection of N beams (N is greater than or equal to 2), and the intersection angles can have various forms. For example, when N = 2, if the two beams are perpendicular to each other, it is a cross shape; if the included angle between the two beams is not 90°, it is an X shape; when N = 3, the included angle between two adjacent beams can be 60°, or other angles; when N = 4, the included angle between two adjacent beams can be 45°, and at this time it is a star shape, or other angles.

[0042] The side beam is in a regular shape, and the regular shape includes a circle, an ellipse, a rhombus, a regular polygon.

[0043] The above cross beam and side beam can be randomly combined, and a better force combination can be considered at the same time: for example, when the frame is a regular polygon, try to set each beam of the cross beam perpendicular to the frame of the regular polygon in contact, rather than preferentially connecting the end of each beam of the cross beam to the vertex of the regular polygon; another example is that after N beams intersect to form a cross beam, when choosing a regular polygon frame, the number of sides of the regular polygon is preferably 2N.

[0044] Meanwhile, a further preferred solution is that the width of the cross beam is not greater than the width of the column at the joint of the flat slab floor. The reason for this design is that the shear resistance is related to the beam width of the cross beam. However, when the beam width of the cross beam is greater than the column width of the column at the joint of the flat slab floor, it cannot improve the shear resistance of the beam at the column edge. To avoid the design error in calculating the shear bearing capacity caused by the setting of the wide and flat beam of the cross beam, it is recommended to keep the beam width of the cross beam not greater than the column width of the column at the joint of the flat slab floor to ensure shear safety.

[0045] When the beam width of the cross beam is less than the column width of the column at the joint of the flat slab floor, the formed opening is not a standard rectangle and can be described as a quasi-rectangle. In fact, four openings can be formed for the vertical pipe routing of equipment. If the pipe routing size is not so large, it can be partially blocked and the equipment pipe holes can be set as required.

[0046] The above embodiments are the preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention shall be equivalent replacement methods and are all included in the protection scope of the present invention.

Claims

1. A column cap for a flat slab joint, characterized in that: It includes cross beams and side beams; The crossing position of the cross beams is set at the upper end of the column of the flat slab joint. A circle of side beams is arranged around the cross beams, and the side beams are fixedly connected to the ends of the cross beams far from the crossing position; A concealed beam extending outward is arranged at the connection between the cross beam and the side beam. The concealed beam is arranged in the floor slab connected to the side beam. The cross beam and the extended concealed beam in the slab form a variable cross-section beam, forming a special frame with the column of the flat slab joint: frame column - variable cross-section frame beam; A plurality of holes are formed between the cross beam and the side beam. The holes are used for vertically arranging pipeline lines and can be integrally or partially blocked as required by a blocking plate; The crossing position of the cross beam coincides with the geometric center of the side beam.

2. The column cap for the flat slab joint according to claim 1, characterized in that: The cross beam is a cross-shaped cross beam, and the side beam is a square-shaped side beam. The cross beam and the side beam form a "field" shape, and four holes are formed between the cross beam and the side beam.

3. The column cap for the flat slab joint according to claim 1, wherein: The cross beam is an X-shaped cross beam.

4. The column cap for the flat slab joint according to claim 1, characterized in that: The cross beam is a star-shaped cross beam.

5. The column cap for the flat slab joint according to claim 1, characterized in that: The side beam is in a regular shape, and the regular shape includes a circle, an ellipse, a rhombus, and a regular polygon.

6. The column cap for the flat slab joint according to claim 1, characterized in that: The height of the side beam is not greater than the height of the cross beam.

7. The column cap for the flat slab joint according to claim 1, characterized in that: The width of the cross beam is not greater than the width of the column of the flat slab joint.

8. The arrangement method of the column cap for the flat slab joint according to any one of claims 1 to 7, characterized in that It includes the following steps: S1. First, fix the formwork of the column cap on the column of the flat slab joint; S2. Then, bind the steel cage of the cross beam and the steel cage of the side beam and place them at the designated position. Set baffles around the holes, and then pour concrete; If the holes are not needed, block them with a blocking plate not exceeding the thickness of the floor slab, and finally form a reinforced concrete beam-column cap.

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