Construction method and structure of steel column foot anchor bolt mechanical reinforcement

Abstract

The application discloses a construction method and structure of mechanical reinforcement of a steel column foot anchor bolt, and the method comprises the following steps: performing hole expansion treatment on the mounting hole of a column foot bottom plate; dividing the anchor bolt into two sections, embedding the lower anchor bolt into the concrete foundation through the mounting hole of the column foot bottom plate, and making the top of the lower anchor bolt higher than the column foot bottom plate; arranging a steel backing plate with a through hole above the column foot bottom plate; arranging a butt nut between the upper anchor bolt and the lower bolt, the butt nut penetrating through the through hole of the steel backing plate, the lower end of the butt nut entering the mounting hole of the column foot bottom plate, and the lower end of the upper anchor bolt being connected with the upper end of the lower anchor bolt through the butt nut, and the upper end of the upper anchor bolt being higher than the steel backing plate; and arranging a nut on the upper end of the upper anchor bolt above the steel backing plate. The application solves the problem that the nut cannot be installed due to the short anchor bolt of the column foot joint by dividing the anchor bolt into two sections and prolonging the exposed length of the anchor bolt through the sleeving reinforcement mode.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel structure construction, and particularly relates to a construction method and structure for mechanical reinforcement of a steel column foot anchor bolt. BACKGROUND

[0002] In recent years, with the development of the construction industry and the progress of technology, steel structures that were mainly used in industrial plants in the past have also been widely used in public buildings and enclosure structures. In steel structure buildings, the main structure column and the foundation are mainly connected in a buried and exposed column foot mode, wherein the exposed column foot is mainly connected by a foot anchor bolt (also known as a foot bolt). As a force transmission component between the steel column and the foundation, the foot anchor bolt plays a crucial role, and its installation precision and quality are directly related to the safety of the structure under stress. However, during on-site construction, the anchor bolt may be displaced or the elevation may change due to unreasonable erection of the embedded part, lack of support system, and collision between the vibrating rod and the anchor bolt during pouring, which may result in a short exposed length of the anchor bolt, failure to install the nut, especially for the double-nut joint, and failure of the column foot to meet the design requirements.

[0003] To solve the above technical problems, the present application provides a construction method and structure for mechanical reinforcement of a steel column foot anchor bolt. SUMMARY

[0004] The purpose of the present application is to provide a construction method and structure for mechanical reinforcement of a steel column foot anchor bolt, which solves the problem of failure to install the nut due to the short anchor bolt of the column foot joint by dividing the anchor bolt into two sections and extending the exposed length thereof by a sleeving reinforcement method.

[0005] To achieve the above purpose, the technical solution adopted by the present application is as follows:

[0006] On the one hand, the present application provides a construction method for mechanical reinforcement of a steel column foot anchor bolt, comprising the following steps:

[0007] The installation hole of the column foot bottom plate is expanded;

[0008] The anchor bolt is divided into upper and lower sections, the lower anchor bolt is embedded into the concrete foundation through the installation hole of the column foot bottom plate, and the top of the lower anchor bolt is higher than the column foot bottom plate;

[0009] A steel backing plate with a through hole is arranged above the column foot bottom plate;

[0010] A butt nut is arranged between the upper anchor bolt and the lower anchor bolt, the butt nut passes through the through hole of the steel backing plate, the lower end of the butt nut enters the installation hole of the column foot bottom plate, the lower end of the upper anchor bolt is connected to the upper end of the lower anchor bolt through the butt nut, and the upper end of the upper anchor bolt is higher than the steel backing plate;

[0011] A nut is installed on the upper end of the upper anchor bolt above the steel backing plate.

[0012] Further, the installation hole of the column base plate is expanded to a diameter of 2d+15mm, d being the diameter of the anchor bolt.

[0013] Further, the through hole of the steel backing plate is 2d+3mm, d being the diameter of the anchor bolt.

[0014] Further, before the nut is installed, a nut washer is arranged at the position of the through hole of the steel backing plate, the upper end of the anchor bolt passes through the nut washer, and then the nut is installed above the washer.

[0015] Further, the length of the butt joint nut is not more than 3d, d being the diameter of the anchor bolt.

[0016] In another aspect, the present application provides a mechanical reinforcement structure for a steel column base anchor bolt, comprising an anchor bolt, a steel backing plate, a butt joint nut, and a nut; the anchor bolt is divided into an upper anchor bolt and a lower anchor bolt, the lower anchor bolt is embedded into the concrete foundation through the installation hole of the column base plate, and the top of the lower anchor bolt is higher than the column base plate; the steel backing plate is arranged on the column base plate, and the steel backing plate has a through hole corresponding to the installation hole position of the column base plate; the butt joint nut is arranged between the upper anchor bolt and the lower anchor bolt, the butt joint nut passes through the through hole of the steel backing plate, and the lower end of the butt joint nut enters the installation hole of the column base plate, the lower end of the upper anchor bolt is connected with the upper end of the lower anchor bolt through the butt joint nut, the upper end of the upper anchor bolt is higher than the steel backing plate, and the nut is installed on the upper end of the upper anchor bolt above the steel backing plate.

[0017] Further, the installation hole of the column base plate is 2d+15mm, the through hole of the steel backing plate is 2d+3mm, and the length of the butt joint nut is not more than 3d, d being the diameter of the anchor bolt.

[0018] Further, a nut washer is arranged on the steel backing plate and corresponds to the through hole, the upper end of the anchor bolt passes through the nut washer, and the nut is installed on the nut washer.

[0019] After the above-mentioned scheme is adopted, the present application has the following beneficial effects:

[0020] 1) By dividing the anchor bolt into two sections and connecting the upper anchor bolt and the lower anchor bolt through the butt joint nut, the exposed length of the anchor bolt is extended in a sleeve joint reinforcement mode, thereby solving the problem that the anchor bolt is too short to install the nut, especially for the double-nut joint.

[0021] 2) Only hole expansion and sleeve joint reinforcement structure need to be performed, without welding, and the on-site reinforcement construction process is simple, and the modification cost is low. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The flowchart of the construction method of the steel column base anchor bolt mechanical reinforcement of the embodiment of the present application;

[0023] Figure 2 Figure 1 is a schematic view of a mechanical reinforcing structure of a steel column foot anchor bolt according to an embodiment of the present application.

[0024] Label explanation

[0025] Concrete foundation 1, column foot bottom plate 2, mounting hole 21, lower anchor bolt 3, upper anchor bolt 4, steel backing plate 5, through hole 51, butt nut 6, nut 7, nut gasket 8. DETAILED DESCRIPTION

[0026] As shown in Figures 1-2 the present application discloses a construction method for mechanical reinforcement of a steel column foot anchor bolt, and the construction steps are as follows:

[0027] S1, the mounting hole 21 of the column foot bottom plate 2 is treated by hole expansion; in this embodiment, the hole diameter of the mounting hole 21 of the column foot bottom plate 2 after expansion treatment is 2d+15mm, d is the diameter of the anchor bolt, which can be adjusted according to the actual size of the anchor bolt used on site;

[0028] S2, the anchor bolt is divided into upper and lower two sections, the lower anchor bolt 3 is embedded into the concrete foundation 1 through the mounting hole 21 of the column foot bottom plate 2, and the top of the lower anchor bolt 3 is higher than the column foot bottom plate 2;

[0029] S3, a steel backing plate 5 with a through hole 51 is arranged above the column foot bottom plate 2; the hole diameter of the through hole 51 of the steel backing plate 5 is 2d+3mm, and the steel backing plate 5 can adopt a multi-layer structure;

[0030] S4, a butt nut 6 is arranged between the upper anchor bolt 4 and the lower anchor bolt, the length of the butt nut 6 is generally not more than 3d, the butt nut 6 passes through the through hole 51 of the steel backing plate 5, and the lower end of the butt nut 6 enters the mounting hole 21 of the column foot bottom plate 2, the lower end of the upper anchor bolt 4 is connected with the upper end of the lower anchor bolt 3 through the butt nut 6, and the upper end of the upper anchor bolt 4 is higher than the steel backing plate 5;

[0031] S5, a nut 7 is installed on the upper end of the upper anchor bolt 4 above the steel backing plate 5.

[0032] By using the above reinforcing method, the anchor bolt is divided into upper and lower two sections, the upper anchor bolt 4 and the lower anchor bolt 3 are connected through the butt nut 6, the exposed length of the anchor bolt is extended in a sleeving reinforcing mode, the problem that the nut 7 cannot be installed due to the short anchor bolt of the column foot joint is solved, especially the joint with double nuts; only hole expansion and sleeving reinforcing structure need to be performed, and no repair welding is needed, the on-site reinforcing construction process is simple, and the modification cost is low.

[0033] Preferably, before installing the nut 7, a nut gasket 8 is arranged at the position of the through hole 51 of the steel backing plate 5, the upper end of the upper anchor bolt 4 passes through the nut gasket 8, and then the nut 7 is installed above the gasket, which can enhance the stability of the anchor bolt after installation.

[0034] In another aspect, the embodiment of the present application also provides a steel column footing anchor mechanical reinforcement structure, as shown in the drawings, which comprises an anchor, a steel backing plate 5, a butt nut 6 and a nut 7. Figure 2 The anchor is divided into an upper anchor 4 and a lower anchor 3, the lower anchor 3 is embedded into the concrete foundation 1 through the mounting hole 21 of the footing bottom plate 2, and the top of the lower anchor 3 is higher than the footing bottom plate 2; the steel backing plate 5 is arranged on the footing bottom plate 2, and the steel backing plate 5 has a through hole 51 corresponding to the position of the mounting hole 21 of the footing bottom plate 2; the butt nut 6 is arranged between the upper anchor 4 and the lower anchor 3, the butt nut 6 passes through the through hole 51 of the steel backing plate 5, and the lower end of the butt nut 6 enters the mounting hole 21 of the footing bottom plate 2, the lower end of the upper anchor 4 is connected with the upper end of the lower anchor 3 through the butt nut 6, the upper end of the upper anchor 4 is higher than the steel backing plate 5, and the nut 7 is arranged on the upper end of the upper anchor 4 above the steel backing plate 5.

[0035] Further, the size of the mounting hole 21 and the through hole 51 and the length of the butt nut 6 can be adjusted according to the size of the anchor used on site, and preferably, the diameter of the mounting hole 21 of the footing bottom plate 2 is 2d+15mm, the diameter of the through hole 51 of the steel backing plate 5 is 2d+3mm, and the length of the butt nut 6 is not more than 3d, d being the diameter of the anchor.

[0036] Preferably, the reinforcement structure further comprises a nut gasket 8 arranged on the steel backing plate 5 and corresponding to the through hole 51, the upper end of the upper anchor 4 passes through the nut gasket 8, and the nut 7 is arranged on the nut gasket 8.

[0037] The above description is only an embodiment of the present application and is not intended to limit the present application, and any modification, equivalent replacement and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A construction method for mechanical reinforcement of steel column foot anchor bolts, characterized in that , including the following steps: Expand the mounting holes of the column base plate; Divide the anchor bolt into two sections, the lower anchor bolt passes through the mounting hole of the column foot plate and is buried in the concrete foundation, with the top of the lower anchor bolt higher than the column foot plate; A steel pad with through holes is provided above the column foot bottom plate; A butt nut is provided between the upper anchor bolt and the lower anchor bolt, the butt nut passes through the through hole of the steel base plate, and the lower end of the butt nut enters the mounting hole of the column foot base plate, the lower end of the upper anchor bolt is connected to the upper end of the lower anchor bolt through the butt nut, and the upper end of the upper anchor bolt is higher than the steel base plate; Install the nut on the upper end of the upper anchor bolt above the steel plate.

2. A construction method for mechanically reinforcing a steel column foot anchor bolt as claimed in claim 1, characterized in that: After the mounting hole of the column base plate is enlarged, its hole diameter is 2d+15mm, where d is the diameter of the anchor bolt.

3. The construction method for mechanically reinforcing the steel column base anchor bolts according to claim 1, characterized in that: The diameter of the through hole of the steel plate is 2d+3mm, where d is the diameter of the anchor bolt.

4. The construction method for mechanically reinforcing the steel column base anchor bolts according to claim 1, characterized in that: Before installing the nut, a nut washer is first set at the through hole position of the steel base plate, the upper end of the upper anchor bolt passes through the nut washer, and then the nut is installed above the washer.

5. The construction method for mechanically reinforcing the steel column base anchor bolts according to claim 1, characterized in that: The length of the butt nut does not exceed 3d, where d is the diameter of the anchor bolt.

6. A mechanical reinforcement structure for steel column foot anchor bolts, characterized in that , including an anchor bolt, a steel base plate, a docking nut and a nut; the anchor bolt is divided into an upper anchor bolt and a lower anchor bolt, the lower anchor bolt passes through the mounting hole of the column foot bottom plate and is buried in the concrete foundation, and the top of the lower anchor bolt is higher than the column foot bottom plate; the steel base plate is arranged on the column foot bottom plate, and the steel base plate has a through hole corresponding to the position of the mounting hole of the column foot bottom plate; the docking nut is arranged between the upper anchor bolt and the lower anchor bolt, the docking nut passes through the through hole of the steel base plate, and the lower end of the docking nut enters the mounting hole of the column foot bottom plate, and the lower end of the upper anchor bolt is connected with the upper end of the lower anchor bolt through the docking nut, the upper end of the upper anchor bolt is higher than the steel base plate, and the nut is installed on the upper end of the upper anchor bolt above the steel base plate.

7. A steel column foot anchor mechanical reinforcement structure according to claim 6, characterized in that: The diameter of the mounting hole of the column base plate is 2d+15mm, the diameter of the through hole of the steel base plate is 2d+3mm, the length of the docking nut does not exceed 3d, and d is the diameter of the anchor bolt.

8. The steel column foot anchor mechanical reinforcement structure according to claim 6, characterized in that: It also includes a nut washer, which is arranged on the steel base plate and corresponds to the through hole. The upper end of the upper anchor bolt passes through the nut washer, and the nut is installed on the nut washer.

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