A method for constructing a cantilever steel structure using a steel column as a temporary support system

Abstract

The application discloses a method for constructing a cantilever steel structure by using steel columns as a temporary support system, which comprises the following steps: constructing a plurality of frame steel columns on a first layer; constructing a plurality of temporary steel columns on the first layer; taking the temporary steel columns on the first layer as a temporary support system of the cantilever steel structure, and starting to simultaneously construct a main structure and the cantilever steel structure on a second layer; and removing all the temporary steel columns serving as the temporary support system on the first layer after the main structure and the cantilever steel structure are constructed to a top layer. The method has the advantages of short construction period and low cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building engineering, and particularly relates to a method for constructing a cantilever steel structure by using a steel column as a temporary support system. BACKGROUND

[0002] In the face of large-span cantilever steel structures, the traditional construction method is to first erect a bent support system, and the cantilever steel structure transmits its load to the ground through the bent support system. The disadvantage is that a large amount of bent material is needed to erect the bent support system before the cantilever steel structure is constructed, and the bent support system needs to be removed after the construction of the cantilever steel structure, resulting in a long construction period and high cost of the erection and removal of the bent support system. SUMMARY

[0003] The purpose of the present application is to provide a method for constructing a cantilever steel structure by using a steel column as a temporary support system to solve the problems of long construction period and high cost of the bent support system.

[0004] In order to solve the above technical problems, the present application provides a method for constructing a cantilever steel structure by using a steel column as a temporary support system, comprising:

[0005] Constructing a plurality of frame steel columns on the first layer, wherein the frame steel columns are distributed in the intersection area of the planar projection of the main structure and the cantilever steel structure, wherein the main structure is constructed starting from the first layer, and the cantilever steel structure is constructed starting from the second layer;

[0006] Constructing a plurality of temporary steel columns on the first layer, wherein the temporary steel columns are distributed on the edge of the cantilever steel structure area away from the main structure area;

[0007] After the construction of the main structure of the first layer, the main structure and the cantilever steel structure are simultaneously constructed starting from the second layer, wherein the cantilever steel structure is connected to the main structure; wherein the method for constructing the cantilever steel structure on the second layer comprises: using the temporary steel columns of the first layer as the temporary support system of the cantilever steel structure, and connecting the second layer frame steel columns of the cantilever steel structure outside the intersection area of the planar projection of the main structure and the cantilever steel structure to the temporary steel columns of the first layer one by one; connecting the second layer frame steel columns of the cantilever steel structure in the intersection area of the planar projection of the main structure and the cantilever steel structure to the frame steel columns of the first layer one by one; constructing a frame steel beam on the second layer frame steel columns of the cantilever steel structure, and constructing a floor structure on the frame steel beam;

[0008] Simultaneously constructing the main structure and the cantilever steel structure of the upper layer;

[0009] After the main structure and the cantilever steel structure are constructed to the top layer, all the temporary steel columns of the first layer as the temporary support system are removed.

[0010] Further, the application provides a method for constructing a cantilever steel structure using steel columns as a temporary support system, the method for constructing multiple temporary steel columns on the first floor comprises:

[0011] Constructing multiple independent foundations at predetermined positions on the ground of the first floor, and connecting a corresponding temporary steel column to each independent foundation.

[0012] Further, the application provides a method for constructing a cantilever steel structure using steel columns as a temporary support system, the method for connecting the independent foundation and the temporary steel column comprises:

[0013] Further, the application provides a method for constructing a cantilever steel structure using steel columns as a temporary support system, the method for connecting the independent foundation and the temporary steel column further comprises:

[0014] Setting a gusset plate between the end plate at the lower end of the temporary steel column and the independent foundation, and connecting the temporary steel column to the independent foundation through the gusset plate via the anchor bolts.

[0015] Further, the application provides a method for constructing a cantilever steel structure using steel columns as a temporary support system, the method for constructing multiple temporary steel columns on the first floor further comprises:

[0016] Adjusting the elevations of the upper ends of the temporary steel columns on the same straight line by setting gusset plates of different heights.

[0017] Further, the application provides a method for constructing a cantilever steel structure using steel columns as a temporary support system, the method for constructing a frame steel beam comprises:

[0018] Setting the frame steel beam to be pre-arched, and lifting the temporary steel columns on the same straight line to match the upper ends of the temporary steel columns on the same straight line with the pre-arched frame steel beam.

[0019] Further, the application provides a method for constructing a cantilever steel structure using steel columns as a temporary support system, the method for connecting the second floor frame steel column to the temporary steel column on the first floor comprises:

[0020] Further, the method for constructing the cantilevered steel structure by using the steel column as the temporary support system provided by the present application comprises the following steps:

[0021] Further, the method for constructing the cantilevered steel structure by using the steel column as the temporary support system provided by the present application comprises the following steps:

[0022] The steel bar truss plate is laid on the frame steel beam, and the concrete is poured to form the floor structure.

[0023] Compared with the prior art, the method for constructing the cantilevered steel structure by using the steel column as the temporary support system has the following beneficial effects:

[0024] I. The temporary steel column is used to replace the bent frame as the temporary support system of the cantilevered steel structure under the starting layer of the cantilevered steel structure, the load of the upper cantilevered steel structure is transmitted to the ground through the temporary steel column, and the bent frame does not need to be erected under the starting layer of the cantilevered steel structure, so that the construction period is shortened, the cost is reduced, and the construction efficiency is improved. The problems of high material cost of the bent frame, high labor cost of erection and removal of the bent frame as the temporary support system of the cantilevered steel structure, and long construction period of the bent frame are solved.

[0025] II. The temporary steel column as the temporary support system of the cantilevered steel structure can reduce the occupation of space, facilitate construction, and solve the problem of large occupation of space of the bent frame support system, which affects the transportation and handling of engineering materials and equipment. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a plan structure schematic diagram of the temporary support system constructed at the first layer;

[0027] Figure 2 It is a plan structure schematic diagram of the cantilevered steel structure and the main structure constructed at the second layer;

[0028] Figure 3 It is a plan structure schematic diagram of the temporary support system removed at the first layer after the construction of the cantilevered steel structure;

[0029] Figure 4 It is a vertical structure schematic diagram of the cantilevered steel structure constructed at the first layer through the temporary support system;

[0030] Figure 5 It is a structure schematic diagram of the temporary steel column and its connection on one side of the cantilevered steel structure region;

[0031] In the drawings:

[0032] 100, main structure;

[0033] 200, cantilever steel structure, 210, frame steel column, 220, frame steel beam, 230, floor structure;

[0034] 300, temporary steel column, 310, independent foundation, 320, column foot bolt, 330, end plate, 340, pad plate, 350, high-strength bolt, 360, stiffened plate. DETAILED DESCRIPTION

[0035] The present application will be described in detail below with reference to the drawings. The advantages and features of the present application will be more apparent from the following description. It should be noted that the drawings are very simplified and use non-precise proportions, only to facilitate, clarify the purpose of assisting the description of the embodiments of the present application.

[0036] Please refer to Figures 1 to 5 The embodiments of the present application provide a method for constructing a cantilever steel structure using steel columns as a temporary support system, which can include the following steps:

[0037] Step 410, please refer to Figure 1 、 Figure 3 and Figure 4 , a plurality of frame steel columns 210 are constructed on the first floor, wherein the frame steel columns 210 are distributed in the intersection area of the planar projection of the main structure 100 and the cantilever steel structure 200, wherein the main structure 100 is constructed starting from the first floor, and the cantilever steel structure 200 is constructed starting from the second floor. The starting layer of the cantilever steel structure 200 can also be adjusted according to design requirements.

[0038] Step 420, please refer to Figure 1 and Figure 4 , a plurality of temporary steel columns 300 are constructed on the first floor, wherein the temporary steel columns 300 are distributed in the edge of the cantilever steel structure 200 area away from the main structure 100 area.

[0039] Step 430, please refer to Figure 2 and Figure 4 , after the construction of the main structure 100 on the first floor, the main structure 100 and the cantilever steel structure 200 are simultaneously constructed starting from the second floor, wherein the cantilever steel structure 200 is connected to the main structure 100. The method for constructing the cantilever steel structure 200 on the second floor can include:

[0040] Step 431, with the temporary steel columns 300 of the first layer as the temporary support system of the cantilever steel structure 200, the second layer frame steel columns 210 of the cantilever steel structure 200 outside the intersection area of the main structure 100 and the planar projection of the cantilever steel structure 200 are one-to-one detachably connected to the temporary steel columns 300 of the first layer. The temporary steel columns 300 can adopt D800x50 round pipe steel columns. When the plan view of the cantilever steel structure 200 and the main structure 100 is triangular, the number of the temporary steel columns 300 distributed outside the intersection area of the main structure 100 and the planar projection of the cantilever steel structure 200 can be 12. Figure 1 The number of the temporary steel columns 300 on the left and right sides of the cantilever steel structure 200 area is 4, and the number of the temporary steel columns 300 on the lower side is 6.

[0041] Step 432, the second layer frame steel columns 210 of the cantilever steel structure 200 in the intersection area of the main structure 100 and the planar projection of the cantilever steel structure 200 are one-to-one connected to the frame steel columns 210 of the first layer.

[0042] Step 433, frame steel beams 220 are constructed on the second layer frame steel columns 210 of the cantilever steel structure 200, and floor structures are constructed on the frame steel beams 220. The method of constructing the floor structures 230 on the frame steel beams 220 can include laying steel bar truss plates (not shown) on the frame steel beams 220 and pouring concrete to form the floor structures 230. The frame steel beams 220 can adopt H-shaped steel or I-shaped steel.

[0043] Step 440, the main structure 100 and the cantilever steel structure 200 of the upper layer are simultaneously constructed.

[0044] Step 450, please refer to Figure 3 After the main structure 100 and the cantilever steel structure 200 are constructed to the top layer, all the temporary steel columns 300 of the first layer as the temporary support system are removed.

[0045] Please refer to Figures 4 to 5 In order to facilitate the removal of the temporary support system after the construction of the cantilever steel structure is completed, the method for constructing the cantilever steel structure by using steel columns as the temporary support system provided by the embodiment of the application can include the following steps: constructing a plurality of independent foundations 310 at predetermined positions on the ground of the first layer, and detachably connecting one temporary steel column 300 to each independent foundation 310. The construction environment of the independent foundation 310 can be a shallow foundation process without a basement, that is, a shallow foundation for the construction building below the ground. In order to ensure flatness, a cushion layer can be constructed between the independent foundation 310 and the ground.

[0046] In order to realize the detachable connection of the lower end of the temporary steel column 300, the method for constructing the cantilever steel structure by using the steel column as the temporary support system provided by the embodiment of the application can comprise the following steps of:

[0047] In step 421, a plurality of anchor bolts 320 are arranged around the independent foundation 310. The anchor bolts 320 can be embedded bolts such as expansion bolts and chemical bolts, and comprise a bolt body and a nut. The nut can be a double-nut structure. The distributed anchor bolts 320 can improve the reliable connection between the temporary steel column 300 and the independent foundation 310.

[0048] In step 422, an end plate 330 is arranged at the lower end of each temporary steel column 300. The end plate 330 at the lower end of the temporary steel column 300 is arranged on the independent foundation 310 through the anchor bolts 320, and the temporary steel column 300 is detachably connected to the independent foundation 310 through the anchor bolts 320.

[0049] Please refer to Figure 5 In order to avoid settlement, the method for constructing the cantilever steel structure by using the steel column as the temporary support system provided by the embodiment of the application can further comprise the following steps of:

[0050] In step 423, a spacer plate 340 is arranged between the end plate 330 at the lower end of the temporary steel column 300 and the independent foundation 310. The anchor bolts 320 penetrate the spacer plate 340 to detachably connect the temporary steel column 300 to the independent foundation 310 through the spacer plate 340. The elevations of the upper ends of the temporary steel columns 300 on the same straight line can be adjusted by arranging spacer plates 340 with different heights. The spacer plates 340 are preferably steel plates or I-beams. The reserved heights between the spacer plates 340 facilitate the height adjustment of the temporary steel columns 300 and the disassembly of the temporary steel columns 300, and provide sufficient operation space.

[0051] In order to avoid settlement, the method for constructing the cantilever steel structure by using the steel column as the temporary support system provided by the embodiment of the application can further comprise the following steps of:

[0052] In step 423, a spacer plate 340 is arranged between the end plate 330 at the lower end of the temporary steel column 300 and the independent foundation 310. The anchor bolts 320 penetrate the spacer plate 340 to detachably connect the temporary steel column 300 to the independent foundation 310 through the spacer plate 340. The elevations of the upper ends of the temporary steel columns 300 on the same straight line can be adjusted by arranging spacer plates 340 with different heights. The spacer plates 340 are preferably steel plates or I-beams. The reserved heights between the spacer plates 340 facilitate the height adjustment of the temporary steel columns 300 and the disassembly of the temporary steel columns 300, and provide sufficient operation space.

[0053] Please refer toFigure 5 In order to realize the detachable connection of the upper end of the temporary steel column 300, the method for constructing the cantilever steel structure by using the steel column as the temporary support system provided by the embodiment of the application can comprise the following steps of:

[0054] A plurality of high-strength bolts 340 are arranged on the end plate 330 at the upper end of the temporary steel column 300, and the second-layer frame steel column 210 of the cantilever steel structure 200 outside the intersection area between the main structure 100 and the planar projection of the cantilever steel structure 200 is detachably connected to the first-layer temporary steel column 300 one by one through the surrounding high-strength bolts 340. The high-strength bolts 340 can be connected between the end plate 330 at the upper end of the temporary steel column 300 and the lower flange of the second-layer frame steel column 210.

[0055] Please refer to Figure 5 In order to improve the reliability of the connection between the upper and lower ends of the temporary steel column 300 and the corresponding end plate 330, the method for constructing the cantilever steel structure by using the steel column as the temporary support system provided by the embodiment of the application comprises the following steps of:

[0056] The method for constructing the cantilever steel structure by using the steel column as the temporary support system provided by the embodiment of the application uses the temporary steel column 300 to replace the bent frame as the temporary support system of the cantilever steel structure 200 below the starting layer of the cantilever steel structure 200, and transmits the load of the upper cantilever steel structure 200 to the ground through the temporary steel column 300, so that the bent frame does not need to be erected below the starting layer of the cantilever steel structure 200, thereby shortening the construction period, reducing the cost, and improving the construction efficiency. The problems of high material cost of the bent frame, high labor cost of erection and removal of the bent frame as the temporary support system of the cantilever steel structure 200, and long construction period of the bent frame are solved.

[0057] The method for constructing the cantilever steel structure by using the steel column as the temporary support system provided by the embodiment of the application can reduce the occupation of space, facilitate construction, and solve the problem of large space occupation of the bent frame support system, which affects the transportation and handling of engineering materials and equipment.

[0058] Please refer to Figure 4 The method for constructing the cantilever steel structure by using the steel column as the temporary support system provided by the embodiment of the application takes the main structure 100 as an example of three layers and the cantilever structure 200 as an example of two layers.

[0059] The present application is not limited to the above-described specific embodiments, and it is obvious that the above-described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the described embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application. Those of ordinary skill in the art can make other levels of modifications and changes to the present application. Thus, if these modifications and changes of the present application belong to the scope of the claims of the present application, the present application also intends to include these modifications and changes.

Claims

1. A method for constructing a cantilevered steel structure using steel columns as a temporary support system, characterized in that, include: Multiple frame steel columns are constructed on the first floor. These frame steel columns are distributed in the area where the plane projections of the main structure and the cantilever steel structure intersect. The main structure is constructed starting on the first floor, and the cantilever steel structure is constructed starting on the second floor. Multiple temporary steel columns were constructed on the first floor, with the temporary steel columns distributed at the edge of the cantilevered steel structure area, which is far from the main structure area. After the main structure of the first floor is constructed, the main structure and the cantilevered steel structure are constructed simultaneously on the second floor, with the cantilevered steel structure connected to the main structure. The method for constructing the cantilevered steel structure on the second floor includes: using the temporary steel columns on the first floor as a temporary support system for the cantilevered steel structure; detachably connecting the second-floor frame steel columns, located outside the area where the cantilevered steel structure is located at the intersection of the planar projections of the main structure and the cantilevered steel structure, to the temporary steel columns on the first floor; connecting the second-floor frame steel columns, located in the area where the cantilevered steel structure is located at the intersection of the planar projections of the main structure and the cantilevered steel structure, to the frame steel columns on the first floor; constructing frame steel beams on the second-floor frame steel columns of the cantilevered steel structure; and constructing the floor slab structure on the frame steel beams. Simultaneous construction of the main structure and cantilevered steel structure of the next floor; After the main structure and cantilevered steel structure are constructed to the top floor, all temporary steel columns on the first floor, which serve as a temporary support system, will be removed.

2. The method for constructing a cantilevered steel structure using steel columns as a temporary support system according to claim 1, characterized in that, Methods for constructing multiple temporary steel columns on the first floor include: Multiple independent foundations are constructed at predetermined locations on the ground of the first floor, and a temporary steel column is detachably connected to each independent foundation.

3. The method for constructing a cantilevered steel structure using steel columns as a temporary support system according to claim 2, characterized in that, The method for detachable connection between the independent foundation and the temporary steel column includes: anchoring several column base bolts around the independent foundation, setting an end plate at the lower end of the temporary steel column, placing the end plate at the lower end of the temporary steel column through the column base bolts on the independent foundation, and detachably connecting the temporary steel column to the independent foundation through the column base bolts.

4. The method for constructing a cantilevered steel structure using steel columns as a temporary support system according to claim 3, characterized in that, The method for detachable connection between the independent foundation and the temporary steel column also includes: A pad is placed between the end plate at the lower end of the temporary steel column and the independent foundation. The column base bolts pass through the pad to detachably connect the temporary steel column to the independent foundation.

5. The method for constructing a cantilevered steel structure using steel columns as a temporary support system according to claim 4, characterized in that, Methods for constructing multiple temporary steel columns on the first floor also include: The elevation of the upper end of the temporary steel column on the same straight line can be adjusted by setting up pads of different heights.

6. The method for constructing a cantilevered steel structure using steel columns as a temporary support system according to claim 5, characterized in that, Methods for constructing steel beams for a frame include: The frame steel beams are pre-arched, and the temporary steel columns on the same straight line are raised so that the line connecting the upper ends of the temporary steel columns on the same straight line is constructed with an arc that matches the arc of the pre-arch of the frame steel beams.

7. The method for constructing a cantilevered steel structure using steel columns as a temporary support system according to claim 1, characterized in that, The method for detachably connecting the second-layer frame steel columns to the first-layer temporary steel columns includes: setting an end plate at the upper end of the temporary steel column, setting a number of high-strength bolts distributed around the end plate at the upper end of the temporary steel column, and connecting the second-layer frame steel columns located outside the intersection area of ​​the plane projection of the main structure and the cantilever steel structure to the first-layer temporary steel columns one by one through the high-strength bolts distributed around the end.

8. The method for constructing a cantilevered steel structure using steel columns as a temporary support system according to claim 3 or 7, characterized in that, Several stiffening plates are installed around the end plate and the temporary steel column.

9. The method for constructing a cantilevered steel structure using steel columns as a temporary support system according to claim 1, characterized in that, Methods for constructing floor slab structures on frame steel beams include: A steel truss slab is laid on the frame steel beam and concrete is poured to form the floor slab structure.

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