A tree-like support system at the main entrance of a steel structure and its construction method

Abstract

The present invention discloses a tree-like support system for a main entrance of a steel structure and a construction method thereof, comprising a main column, an inclined column, a bifurcated column, and a support frame. The bottom end of the main column is fixedly mounted on a concrete cushion, the top of the main column is fixedly connected to the bottom end of the bifurcated column via the inclined column, the top end of the bifurcated column is fixedly supported on a bottom corner of a conversion truss arranged on the top of the steel structure, the support frame is fixedly supported around the main column, and the bottom end of the support frame is mounted on the top of the concrete cushion. The main column comprises, from bottom to top, a first small main column, a second small main column, and a third small main column. The bottom end of the first small main column is fixedly mounted on the concrete cushion via an anchor assembly. The construction method is to sequentially install the anchor assembly, the main column, the bifurcated column, and the conversion beam in order from bottom to top. The support system has a large top and a small bottom, and occupies little space at the bottom, but is securely installed and fixed, and the construction method is rigorous and reasonable, which can effectively shorten the construction period.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and in particular to a tree-shaped support system at a main entrance of a steel structure and a construction method thereof. Background Art

[0002] With the development of society and the progress of the times, there is an increasing demand for comprehensive commercial and financial buildings that integrate office and commercial functions. Buildings of this nature not only require a reasonable allocation of space utilization, but also require unique shapes to attract traffic. Buildings that use a steel-concrete structure in the basement and a steel frame structure above ground can make rational use of space, while the overall appearance characteristics can be designed differently in the steel structure shape or steel structure support system. The tree-like structure is a type of spatial bionic structure with a reasonable force transmission path, high bearing capacity, wide support coverage, small bottom space occupation, and unique shape. As a support at the main entrance of the steel structure, it not only has a unique shape but also reasonably supports the top steel structure.

[0003] The utility model patent with application number 202120328979.0 discloses an integral branch column extension support structure based on the extension of the steel structure, including a support column, the upper end of the support column is provided with a cast steel node welded integrally with the support column, and the cast steel node is provided with a number of branch beams distributed in an equidistant ring. The support column includes a core column, and the periphery of the core column is provided with a number of U-shaped columns distributed in an equidistant ring. It has the characteristics of simple structure, high strength and good stability. It solves the problem of the difference in steel column resistance to bending moment and horizontal shear force. It increases the moment of inertia of the section and improves the bending bearing capacity.

[0004] Patent application number CN202111189148.0 discloses a support system for the installation of a tree-shaped column structure. Specifically, the system comprises a main truss, a sliding device, and a fixing device. The main truss is mounted on two tree-shaped columns; the tree-shaped columns are provided with sliding devices, with the main truss abutting against the sliding devices; and the fixing device is located on one side of the main truss, with one end fixed to the main truss and the other to the branch rods of the tree-shaped columns. The sliding device is placed on the tree-shaped columns, and the main truss is then hoisted and placed on two adjacent tree-shaped columns to slide and adjust its position. The main truss is then secured with the fixing device. A connecting truss segment is hoisted and temporarily placed on the support system, allowing workers to operate and construct the structure on the main truss. The connecting truss is then welded to the branch rods of the tree-shaped columns. Once the connecting truss is secured, the fixing device is released, and the main truss is slid to the top of the next tree-shaped column. The remaining connecting truss segments are then installed in the same manner.

[0005] It can be seen from this that the tree-like support system is large at the top and small at the bottom, which makes installation and fixation difficult, and the overall construction is difficult. Summary of the Invention

[0006] The purpose of the present invention is to provide a tree-like support system at the main entrance of a steel structure and a construction method thereof, which solves the problem of difficult installation and fixing in the existing tree-like support system.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A tree-like support system at the main entrance of a steel structure, comprising a main column, an inclined column, a bifurcated column, an anchor assembly, a support ring beam, a plurality of diagonal braces, and a support frame. The main column is fixedly mounted on a concrete cushion by the anchor assembly, the top end of the main column is fixedly connected to the bottom end of the bifurcated column by the inclined column, the top end of the bifurcated column is fixedly supported on a bottom corner of a conversion truss provided on the top of the steel structure, the support frame is fixedly supported around the main column, and the bottom end of the support frame is mounted on the top of the concrete cushion;

[0009] The main columns include, from bottom to top, a first small main column, a second small main column and a third small main column. The bottom end of the first small main column is fixedly connected to an anchor assembly embedded in a concrete cushion layer. The first small main column and the concrete cushion layer are supported by the support ring beam; the second small main column and the support ring beam are supported by a plurality of the diagonal struts; the third small main column and the concrete cushion layer are supported by the support frame; the first small main column, the bottom of the second small main column, the support ring beam, the plurality of the diagonal struts and the bottom of the support frame are integrally cast in the pedestal foundation.

[0010] Preferably, the main column, the oblique column and the bifurcated column are all made of stainless steel tubes, and a cross stiffening plate is provided inside the stainless steel tubes.

[0011] Preferably, the bifurcated columns include two first-level bifurcated columns and three second-level bifurcated columns; the two first-level bifurcated columns are respectively the first bifurcated column and the second bifurcated column, the bottom end of the first bifurcated column is fixedly installed on the top of the inclined column, the bottom end of the second bifurcated column is fixedly installed on the side notch of the inclined column, and a Y-shaped structure is formed between the first bifurcated column, the second bifurcated column and the inclined column; the three second-level bifurcated columns are respectively the third bifurcated column, the fourth bifurcated column and the fifth bifurcated column, the bottom end of the third bifurcated column is fixedly installed on the top of the second bifurcated column, the fourth bifurcated column and the fifth bifurcated column are fixedly installed on the top of the first bifurcated column through a three-way column to form a Y-shaped structure.

[0012] Preferably, the tops of the third bifurcated column, the fourth bifurcated column and the fifth bifurcated column are flush with each other, and any two of them are connected by a top crossbeam.

[0013] Preferably, the anchor assembly includes two layers of positioning ring plates and multiple anchor rods, the bottom layer of positioning ring plates is arranged inside the steel bars of the concrete cushion layer, and the top layer of positioning ring plates is arranged on top of the steel bars of the concrete cushion layer, and the multiple anchor rods are evenly spaced and fixed on the two layers of positioning ring plates, and the two layers of positioning ring plates and the bottoms of the multiple anchor rods are integrally cast in the concrete cushion layer with the steel bars; the bottom end of the first small main column is tightly attached to the top layer of positioning ring plates and fixedly connected to the top ends of the multiple anchor rods.

[0014] Preferably, the support ring beam is a radial steel structure composed of six or eight support beams, and one side of the support beam is fixedly installed on the top surface of the concrete cushion layer.

[0015] Preferably, the support frame includes multiple support rods and two groups of radial steel beam assemblies, and the third small main column and the inclined column are connected to the support frame through a group of radial steel beam assemblies; multiple support rods are evenly spaced around the periphery of the main column, and the bottom of the support rods is fixedly installed on the concrete pad; the radial steel beam assembly is a radial steel structure composed of multiple steel beams with one end fixedly installed on the outer wall of the third small main column or the outer wall of the inclined column and the other end fixedly connected to the support rod, and the number of the steel beams is consistent with the number of the support rods.

[0016] Preferably, a layer of floor formwork is constructed on both groups of the radial steel beam assemblies.

[0017] Preferably, the conversion truss is a truss structure built upwardly relying on the three top beams.

[0018] A construction method for a tree-like support system at a main entrance of a steel structure comprises the following steps:

[0019] Step 1: pre-embed the anchoring components, tie the bottom steel bars of the concrete cushion layer, fix the bottom positioning ring plate on the top of the bottom steel bars of the concrete cushion layer, tie the top steel bars of the concrete cushion layer, fix the top positioning ring plate on the top of the top steel bars of the concrete cushion layer, and then install a cross steel frame at the center of the top positioning ring plate. Use the cross steel frame as the installation and positioning reference point to install multiple anchor rods. After adjusting the elevations of multiple screw rods, remove the cross steel frame and pour concrete to form a concrete cushion layer. After pouring, the top ends of multiple anchor rods are exposed on the top of the concrete cushion layer.

[0020] Step 2: Install the first small main column. Lift the first small main column to the embedded position of the anchor assembly and then move it downward. Then, fix the bottom of the first small main column to the top of multiple anchor rods exposed on the top of the concrete cushion layer.

[0021] Step 3: Install the support ring beam, keep the hook of the first small main column intact, complete the lifting of multiple support beams in sequence, and fix the multiple support beams on the concrete pad in sequence to form a support ring beam. After completing the installation of the support ring beam, remove the hook from the first small main column;

[0022] Step 4: Install support rods. Lift multiple support rods in sequence and install them evenly spaced around the first small main column. The bottoms of the support rods are fixedly installed on the concrete cushion layer.

[0023] Step 5: Install the second small main column. Use a truck crane to lift the second small main column to the top of the first small main column, and fix the bottom end of the second small main column to the top end of the first small main column.

[0024] Step 6: Install diagonal bracing rods, and evenly space and fix multiple diagonal bracing rods between the second small main column and the support beam;

[0025] Step seven, pouring a cap foundation, pouring concrete on the first small main column, the bottom of the second small main column, the support ring beam, the plurality of diagonal braces and the bottom of the support frame to form a cap foundation;

[0026] Step 8: Install the third small main column by using a truck crane to lift the third small main column to the top of the second small main column, and fix the bottom end of the third small main column to the top end of the second small main column;

[0027] Step nine: Install the bottom radial steel beam assembly, and evenly space multiple steel beams on the outer wall of the third small main column in a radial pattern. The other ends of the steel beams are fixedly connected to the support rods to form the bottom radial steel beam assembly;

[0028] Step 10: Install the inclined column, lift the inclined column to the top of the third small main column, and fix the bottom end of the inclined column to the top end of the third small main column;

[0029] Step 11: Install the top radial steel beam assembly, evenly spaced and radially fixedly install multiple steel beams on the outer side wall of the inclined column, and the other ends of the steel beams are fixedly connected to the support rods to form the top radial steel beam assembly and the support frame;

[0030] Step 12: Install two-story floor formwork, fix two beams between two adjacent support rods, the installation positions of the two beams corresponding to the two groups of radial steel beam assemblies, and then build the floor formwork on the two groups of radial steel beam assemblies;

[0031] Step 13: Build a temporary support on the top of the support frame;

[0032] Step 14: Install the first-level bifurcated column. Lift the first bifurcated column to the top of the inclined column and secure the bottom end of the first bifurcated column to the top of the inclined column. Lift the second bifurcated column to the notch on the side of the inclined column and secure the bottom end of the second bifurcated column to the notch on the side of the inclined column.

[0033] Step 15: Install the secondary bifurcated column. Lift the third bifurcated column to the top of the second bifurcated column, and secure the bottom end of the third bifurcated column to the top of the second bifurcated column. Lift the tee column to the top of the first bifurcated column, and secure the bottom end of the tee column to the top of the first bifurcated column. Lift the fourth and fifth bifurcated columns in sequence and secure them to the top of the tee column.

[0034] Step 16: Install a top crossbeam, connecting the tops of the third bifurcated column, the fourth bifurcated column, and the fifth bifurcated column by a top crossbeam to form a stable triangular structure;

[0035] Step 17: Install the transfer truss. Build the transfer truss upwards, relying on the three top beams.

[0036] Step 18: Remove the temporary support. Remove the temporary support built on the top of the support frame.

[0037] In the present invention, the main column is divided into three sections: the first small main column, the second small main column and the third small main column. The three sections are installed in sequence from bottom to top, and each section is fixed and supported during installation, thereby improving the stability of the main column installation. Among them, the first small main column is fixedly installed on the top of the concrete cushion layer by an anchor bolt assembly, and the anchor bolt assembly is pre-embedded in the concrete cushion layer, thereby improving the stability of the connection between the first small main column and the concrete cushion layer; the first small main column and the concrete cushion layer are supported by a support ring beam, and the support ring beam is radial, thereby improving the stability of the installation of the first small main column; the second small main column and the support beam are supported by multiple diagonal braces to increase the stability of the installation of the second small main column; the third small main column and the concrete cushion layer are supported by a support frame to increase the stability of the installation of the third small main column.

[0038] The pouring of the pedestal foundation realizes the pre-embedding of the first small main column 11, the bottom of the second small main column 12, the support ring beam 6, multiple diagonal braces and the bottom of the support frame, thereby increasing the strength of the connection.

[0039] The bifurcated column is a double Y-shaped structure consisting of two first-level bifurcated columns and three second-level bifurcated columns. It increases the connection nodes between the bifurcated columns and the conversion trusses, increases the support stability, and the bifurcated columns are supported by a main column, and the bottom occupies a small space.

[0040] The support frame includes two sets of radial steel beam assemblies and multiple support rods. The third small main column and the inclined column are connected to the multiple support rods through a set of radial steel beam assemblies, which increases the installation stability of the third small main column and the inclined column. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0042] Figure 2 This is a schematic structural diagram of the anchor assembly of the present invention;

[0043] Figure 3 This is a schematic diagram of the second construction step of the present invention;

[0044] Figure 4 This is a schematic diagram of construction step three of the present invention;

[0045] Figure 5 This is a schematic diagram of construction step 4 of the present invention;

[0046] Figure 6 This is a schematic diagram of construction step five of the present invention;

[0047] Figure 7 This is a schematic diagram of construction step six of the present invention;

[0048] Figure 8 This is a schematic diagram of construction step seven of the present invention;

[0049] Figure 9 This is a schematic diagram of construction step eight of the present invention;

[0050] Figure 10 This is a schematic diagram of construction step nine of the present invention;

[0051] Figure 11 This is a schematic diagram of the ten construction steps of the present invention;

[0052] Figure 12 This is a schematic diagram of the eleventh construction step of the present invention;

[0053] Figure 13 This is a schematic diagram of construction step 12 of the present invention;

[0054] Figure 14 This is a schematic diagram of the thirteenth construction step of the present invention;

[0055] Figure 15 Schematic diagrams of the fourteenth, fifteenth and sixteenth steps of the present invention;

[0056] Figure 16 This is a schematic diagram of construction step seventeen of the present invention.

[0057] In the figure: 1. Main column; 2. Inclined column; 3. Bifurcation column; 4. Anchor bolt assembly; 5. Concrete cushion; 6. Support ring beam; 7. Conversion truss; 8. Cap foundation; 9. Support frame; 10. Diagonal brace; 11. First small main column; 12. Second small main column; 13. Third small main column; 30. First-level bifurcated column; 31. Second-level bifurcated column; 32. Tee column; 33. Top crossbeam; 40. Positioning ring plate; 41. Anchor rod; 60. Support beam; 90. Support rod; 91. Radial steel beam assembly; 92. Crossbeam. DETAILED DESCRIPTION

[0058] The present invention will be further described below with reference to the accompanying drawings:

[0059] like Figure 1 The tree-like support system for the main entrance of a steel structure shown includes a main column 1, inclined columns 2, bifurcated columns 3, an anchor assembly 4, a support ring beam 6, multiple diagonal braces 10, and a support frame 9. The main column 1, inclined columns 2, and bifurcated columns 3 are all made of stainless steel pipes, each of which is equipped with a cross-stiffening plate. The cross-stiffening plate increases the rigidity and strength of the stainless steel pipe. The main column 1 is fixedly mounted on a concrete cushion 5 via the anchor assembly 4. The top of the main column 1 is fixedly connected to the bottom of the bifurcated column 3 via the inclined column 2. The top of the bifurcated column 3 is fixedly supported on the bottom corner of a conversion truss 7 installed at the top of the steel structure. The support frame 9 is fixedly supported around the main column 1, and the bottom of the support frame 9 is installed on the top of the concrete cushion 5.

[0060] The main column 1 includes, from bottom to top, a first small main column 11, a second small main column 12 and a third small main column 13. The bottom end of the first small main column 11 is fixedly connected to the anchor bolt assembly 4 embedded in the concrete cushion layer 5. The first small main column 11 and the concrete cushion layer 5 are supported by a support ring beam 6; the second small main column 12 and the support ring beam 6 are supported by multiple diagonal struts 10; the third small main column 13 and the concrete cushion layer 5 are supported by a support frame 9; the bottom of the first small main column 11, the second small main column 12, the support ring beam 6, the multiple diagonal struts 10 and the bottom of the support frame 9 are cast integrally in the pedestal foundation 8.

[0061] The bifurcated column 3 includes two first-level bifurcated columns 30 and three second-level bifurcated columns 31; the two first-level bifurcated columns 30 are respectively the first bifurcated column and the second bifurcated column, the bottom end of the first bifurcated column is fixedly mounted on the top of the inclined column 2 by welding, and the bottom end of the second bifurcated column is fixedly mounted on the side notch of the inclined column 2 by welding, and the first bifurcated column, the second bifurcated column and the inclined column 2 form a Y-shaped structure. The three second-level bifurcated columns 31 are respectively the third bifurcated column, the fourth bifurcated column and the fifth bifurcated column, the bottom end of the third bifurcated column is fixedly mounted on the top of the second bifurcated column by welding, and the fourth bifurcated column and the fifth bifurcated column are fixedly mounted on the top of the first bifurcated column through a three-way column 32 to form a Y-shaped structure, and the three-way column 32 and the first bifurcated column, the fourth bifurcated column and the three-way column 32, and the fifth bifurcated column and the three-way column 32 are all fixedly connected by welding. The tops of the third bifurcated column, the fourth bifurcated column and the fifth bifurcated column are flush, and each of them is connected by welding through a top crossbeam 33, forming a stable triangular structure. The conversion truss 7 is a truss structure built upwardly by welding three top cross beams 33 .

[0062] like Figure 2 As shown, the anchor assembly 4 includes two layers of positioning ring plates 40 and multiple anchor rods 41. The bottom positioning ring plate 40 is arranged inside the steel bars of the concrete cushion layer 5, and the top positioning ring plate 40 is arranged on the top of the steel bars of the concrete cushion layer 5. Multiple anchor rods 41 are evenly spaced and fixed on the two layers of positioning ring plates 40. The bottoms of the two layers of positioning ring plates 40 and the multiple anchor rods 41 are cast integrally with the steel bars in the concrete cushion layer 5; the bottom end of the first small main column 11 is tightly attached to the top positioning ring plate 40 and fixedly connected to the top ends of the multiple anchor rods 41.

[0063] The support ring beam 6 is a radial steel structure composed of six or eight support beams 60. One side of the support beam 60 is fixedly installed on the top surface of the concrete cushion layer 5. The support beam 60 is made of I-beams or channel steels.

[0064] The support frame 9 includes multiple support rods 90 and two sets of radial steel beam assemblies 91. The third small main column 13 and the inclined column 2 are both connected to the support frame 9 through a set of radial steel beam assemblies 91. Multiple support rods 90 are evenly spaced around the periphery of the main column 1, and the bottoms of the support rods 90 are fixedly installed on the concrete cushion 5. The radial steel beam assemblies 91 are radial steel structures composed of multiple steel beams with one end fixedly installed on the outer wall of the third small main column 13 or the outer wall of the inclined column 2, and the other end fixedly connected to the support rods 90. The number of steel beams is the same as the number of support rods 90. A layer of floor slab formwork is built on both sets of radial steel beam assemblies 91. In this example, the top floor slab formwork is flush with the top of the third small main column 13.

[0065] A construction method for a tree-like support system at a main entrance of a steel structure comprises the following steps:

[0066] The first step is to embed the anchor assembly 4, tie the bottom steel bar of the concrete cushion 5, fix the bottom positioning ring plate 40 on the top of the bottom steel bar of the concrete cushion 5, and then tie the top steel bar of the concrete cushion 5, and fix the top positioning ring plate 40 on the top of the top steel bar of the concrete cushion 5. Then, use fasteners or welding to temporarily install a cross steel frame at the center of the top positioning ring plate 40. The cross steel frame is made of channel steel, and the cross steel frame is used as the installation positioning reference point to install multiple anchor rods 41. During the installation process, each anchor rod 41 is used as a check point for the entire anchor assembly 4. The elevation of each screw rod 41 is adjusted by adjusting the adjusting nut on the anchor rod 41. After adjusting the elevation of multiple screws, the cross steel frame is removed, and concrete is poured to form a concrete cushion 5. The anchor assembly 4 is poured and embedded in the concrete cushion 5. After pouring, the top ends of multiple anchor rods 41 are exposed on the top of the concrete cushion 5.

[0067] Step 2: Install the first small main column 11, as shown in Figure 3 As shown, a truck crane is used to lift the first small main column 11 to the embedded position of the anchor assembly 4 and then move it downward, and then the bottom of the first small main column 11 is fixedly connected to the top of multiple anchor rods exposed on the top of the concrete cushion layer 5;

[0068] Step 3: Install the support ring beam 6, such as Figure 4 As shown, the first small main column 11 is kept hoisted without loosening the hook, and a tower crane is used to sequentially complete the hoisting of multiple support beams 60, and the multiple support beams 60 are sequentially fixed on the concrete cushion layer 5 by anchor bolts to form a support ring beam 6. After the installation of the support ring beam 6 is completed, the hook is detached from the first small main column 11, wherein the multiple support beams 60 are evenly spaced and radially arranged on the outer wall of the first small main column 11 by welding, and one side of the support beam 60 is fixed to the top surface of the concrete cushion layer 5 by anchor bolts;

[0069] Step 4: Install the support rod 90. Figure 5 As shown, multiple support rods 90 are hoisted in sequence and evenly spaced around the first small main column 11. The bottom of the support rod 90 is fixed on the concrete pad 5 by anchor bolts;

[0070] Step 5: Install the second small main column 12. Figure 6 As shown, a truck crane is used to lift the second small main column 12 to the top of the first small main column 11, and the bottom end of the second small main column 12 is fixedly connected to the top end of the first small main column 11 by welding;

[0071] Step 6: Install the diagonal brace 10, as shown in the following example: Figure 7 As shown, multiple diagonal bracing rods 10 are fixed and supported between the second small main column 12 and the support beam 60 by welding at even intervals;

[0072] Step seven, pouring the foundation 8, such as Figure 8As shown, concrete is poured at the bottom of the first small main column 11, the second small main column 12, the support ring beam 6, the multiple diagonal braces 10 and the bottom of the support frame 9 to form a cap foundation 8;

[0073] Step eight, install the third small main column 13, as shown in FIG. Figure 9 As shown, a truck crane is used to lift the third small main column 13 to the top of the second small main column 12, and the bottom end of the third small main column 13 is fixedly connected to the top end of the second small main column 12 by welding;

[0074] Step nine, install the bottom radial steel beam assembly 91, such as Figure 10 As shown, multiple steel beams are fixedly installed radially on the outer side wall of the third small main column 13 by welding at even intervals, and the other ends of the steel beams are fixedly connected to the support rods 90 by welding to form a bottom radial steel beam assembly 91;

[0075] Step 10: Install the inclined column 2, as shown in the following example: Figure 11 As shown, a truck crane is used to lift the inclined column 2 to the top of the third small main column 13, and the bottom end of the inclined column 2 is fixedly connected to the top end of the third small main column 13 by welding;

[0076] Step 11: Install the top radial steel beam assembly 91, as shown in Figure 12 As shown, multiple steel beams are fixedly installed radially on the outer wall of the inclined column 2 at even intervals by welding, and the other ends of the steel beams are fixedly connected to the support rods 90 by welding to form a top-level radial steel beam assembly 91, forming a support frame 9;

[0077] Step 12: Install two-layer floor slab formwork, such as Figure 13 As shown, two beams 92 are fixedly connected between two adjacent support rods 90 by welding. The installation positions of the two beams 92 correspond to the two sets of radial steel beam assemblies 91, and then the floor template is built on the two sets of radial steel beam assemblies 91;

[0078] Step 13: Build a temporary support, such as Figure 14 As shown, a temporary support is built on top of the support frame 9;

[0079] Step 14: Install the first-level bifurcated column 30, as shown in Figure 15 As shown, use a truck crane to lift the first bifurcated column to the top of the inclined column, and fix the bottom end of the first bifurcated column to the top of the inclined column 2 by welding; use a truck crane to lift the second bifurcated column to the notch on the side of the inclined column, and fix the bottom end of the second bifurcated column to the notch on the side of the inclined column 2 by welding;

[0080] Step 15: Install the secondary bifurcated column 31, as shown in Figure 15As shown, the third bifurcated column is hoisted to the top of the second bifurcated column using a truck crane, and the bottom end of the third bifurcated column is fixedly mounted on the top of the second bifurcated column by welding; the tee column 32 is hoisted to the top of the first bifurcated column using a truck crane, and the bottom end of the tee column 32 is fixedly mounted on the top of the first bifurcated column by welding; the fourth bifurcated column and the fifth bifurcated column are hoisted in sequence using a truck crane and are fixedly mounted on the top of the tee column 32 by welding;

[0081] Step 16: Install the top crossbeam 33, as shown in Figure 15 As shown, the tops of the third bifurcated column, the fourth bifurcated column and the fifth bifurcated column are connected by a top crossbeam 33 to form a triangular stable structure;

[0082] Step 17: Install the conversion truss 7, as shown in Figure 16 As shown, the conversion truss 7 is built upwards by welding three top cross beams 33;

[0083] Step 18: Remove the temporary support. Remove the temporary support built on the top of the support frame 9.

[0084] The above embodiments are merely some illustrations of the concept and implementation of the present invention, and are not intended to limit the same. Under the concept of the present invention, technical solutions that have not been substantially changed are still within the scope of protection.

Claims

1. A tree-like support system at the main entrance of a steel structure, characterized by: It comprises a main column (1), an inclined column (2), a bifurcated column (3), an anchor bolt assembly (4), a support ring beam (6), a plurality of oblique bracing rods (10) and a support frame (9), wherein the main column (1) is fixedly mounted on a concrete cushion layer (5) via the anchor bolt assembly (4), the top end of the main column (1) is fixedly connected to the bottom end of the bifurcated column (3) via the inclined column (2), the top end of the bifurcated column (3) is fixedly supported on a bottom corner of a conversion truss (7) arranged on the top of the steel structure, the support frame (9) is fixedly supported around the main column (1), and the bottom end of the support frame (9) is mounted on the top of the concrete cushion layer (5); The main column (1) comprises, from bottom to top, a first small main column (11), a second small main column (12) and a third small main column (13), wherein the bottom end of the first small main column (11) is fixedly connected to an anchor assembly (4) pre-buried in a concrete cushion layer (5), and the first small main column (11) and the concrete cushion layer (5) are supported by the support ring beam (6); the second small main column (12) and the support ring beam (6) are supported by a plurality of the diagonal bracing rods (10); and the third small main column (13) and the concrete cushion layer (5) are supported by the support frame (9); the bottoms of the first small main column (11), the second small main column (12), the support ring beam (6), the plurality of the diagonal bracing rods (10) and the bottom of the support frame (9) are integrally cast in a cap foundation (8); The anchor bolt assembly (4) comprises two layers of positioning ring plates (40) and a plurality of anchor rods (41), wherein the bottom layer of the positioning ring plate (40) is arranged inside the steel bars of the concrete cushion layer (5), and the top layer of the positioning ring plate (40) is arranged on the top of the steel bars of the concrete cushion layer (5), and the plurality of anchor rods (41) are evenly spaced and fixed through the two layers of positioning ring plates (40), and the bottoms of the two layers of the positioning ring plates (40) and the plurality of anchor rods (41) are integrally cast with the steel bars in the concrete cushion layer (5); the bottom end of the first small main column (11) is in close contact with the top layer of the positioning ring plate (40) and is fixedly connected to the top ends of the plurality of anchor rods (41).

2. The tree-like support system at the main entrance of the steel structure according to claim 1 is characterized by: The main column (1), the oblique column (2) and the bifurcated column (3) are all made of stainless steel tubes, and cross stiffening plates are arranged inside the stainless steel tubes.

3. The tree-like support system at the main entrance of the steel structure according to claim 1 or 2, characterized in that: The bifurcated column (3) comprises two first-level bifurcated columns (30) and three second-level bifurcated columns (31); the two first-level bifurcated columns (30) are respectively a first bifurcated column and a second bifurcated column, the bottom end of the first bifurcated column is fixedly mounted on the top end of the inclined column (2), the bottom end of the second bifurcated column is fixedly mounted on the side notch of the inclined column (2), and a Y-shaped structure is formed between the first bifurcated column, the second bifurcated column and the inclined column (2); the three second-level bifurcated columns (31) are respectively a third bifurcated column, a fourth bifurcated column and a fifth bifurcated column, the bottom end of the third bifurcated column is fixedly mounted on the top end of the second bifurcated column, and the fourth bifurcated column and the fifth bifurcated column are fixedly mounted on the top end of the first bifurcated column through a three-way column (32) to form a Y-shaped structure.

4. The tree-like support system at the main entrance of the steel structure according to claim 3 is characterized by: The tops of the third bifurcated column, the fourth bifurcated column and the fifth bifurcated column are flush with each other, and are connected by a top crossbeam (33).

5. The tree-like support system at the main entrance of the steel structure according to claim 1 is characterized by: The support ring beam (6) is a radial steel structure composed of six or eight support beams (60), and one side of the support beam (60) is fixedly mounted on the top surface of the concrete cushion layer (5).

6. The tree-like support system at the main entrance of the steel structure according to claim 1 or 2, characterized in that: The support frame (9) includes a plurality of support rods (90) and two groups of radial steel beam assemblies (91), and the third small main column (13) and the inclined column (2) are both connected to the support frame (9) through a group of radial steel beam assemblies (91); a plurality of the support rods (90) are evenly spaced around the periphery of the main column (1), and the bottoms of the support rods (90) are fixedly installed on the concrete cushion layer (5); the radial steel beam assemblies (91) are radial steel structures composed of a plurality of steel beams, one end of which is fixedly installed on the outer wall of the third small main column (13) or the outer wall of the inclined column (2) and the other end of which is fixedly connected to the support rods (90), and the number of the steel beams is consistent with the number of the support rods (90).

7. The tree-like support system at the main entrance of the steel structure according to claim 6 is characterized by: A layer of floor slab formwork is constructed on both sets of radial steel beam assemblies (91).

8. The tree-like support system at the main entrance of the steel structure according to claim 4 is characterized by: The conversion truss (7) is a truss structure built upwardly based on the three top crossbeams (33).

9. The construction method of a tree-like support system at the main entrance of a steel structure according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: pre-embed the anchor bolt assembly (4), tie the bottom steel bar of the concrete cushion layer (5), fix the bottom positioning ring plate (40) on the top of the bottom steel bar of the concrete cushion layer (5), tie the top steel bar of the concrete cushion layer (5), fix the top positioning ring plate (40) on the top of the top steel bar of the concrete cushion layer (5), and then install a cross steel frame at the center of the top positioning ring plate (40). The cross steel frame is used as the installation positioning reference point, and multiple anchor rods (41) are installed. After adjusting the elevation of multiple screw rods, the cross steel frame is removed, and concrete is poured to form the concrete cushion layer (5). After pouring, the top ends of multiple anchor rods (41) are exposed on the top of the concrete cushion layer (5); Step 2: Install the first small main column (11), lift the first small main column (11) to the embedded position of the anchor bolt assembly (4), and then move it downward, and then fix the bottom of the first small main column (11) to the top of multiple anchor rods exposed on the top of the concrete cushion layer (5); Step 3: Install the support ring beam (6), keep the first small main column (11) from being loosened, complete the lifting of multiple support beams (60) in sequence, and sequentially fix the multiple support beams (60) on the concrete cushion layer (5) to form the support ring beam (6), and after completing the installation of the support ring beam (6), detach the hook from the first small main column (11); Step 4: Install the support rods (90), lift multiple support rods (90) in sequence and install them evenly spaced around the first small main column (11), and fix the bottom of the support rods (90) on the concrete cushion layer (5); Step 5: Install the second small main column (12). Use a car crane to lift the second small main column (12) to the top of the first small main column (11), and fix the bottom end of the second small main column (12) to the top end of the first small main column (11); Step six, installing the diagonal bracing rods (10), and fixing and supporting the plurality of diagonal bracing rods (10) at even intervals between the second small main column (12) and the support beam (60); Step seven, pouring a cap foundation (8), pouring concrete on the bottom of the first small main column (11), the second small main column (12), the support ring beam (6), the plurality of diagonal braces (10) and the bottom of the support frame (9) to form a cap foundation (8); Step eight, installing the third small main column (13), using a car crane to lift the third small main column (13) to the top of the second small main column (12), and fixedly connecting the bottom end of the third small main column (13) to the top end of the second small main column (12); Step nine, installing a bottom radial steel beam assembly (91), fixing multiple steel beams evenly spaced radially on the outer side wall of the third small main column (13), and fixing the other ends of the steel beams to the support rods (90) to form a bottom radial steel beam assembly (91); Step 10, installing the inclined column (2), lifting the inclined column (2) to the top of the third small main column (13), and fixing the bottom end of the inclined column (2) to the top end of the third small main column (13); Step 11, installing a top radial steel beam assembly (91), fixing multiple steel beams evenly spaced radially on the outer wall of the inclined column (2), and fixing the other ends of the steel beams to the support rods (90) to form a top radial steel beam assembly (91), forming a support frame (9); Step 12: Install two-layer floor slab formwork, fix two crossbeams (92) between two adjacent support rods (90), the installation positions of the two crossbeams (92) correspond to the two groups of radial steel beam assemblies (91), and then build the floor slab formwork on the two groups of radial steel beam assemblies (91); Step 13: build a temporary support on the top of the support frame (9); Step 14: Install the first-level bifurcated column (30), hoist the first bifurcated column to the top of the inclined column, and fix the bottom end of the first bifurcated column to the top of the inclined column (2); hoist the second bifurcated column to the notch on the side of the inclined column, and fix the bottom end of the second bifurcated column to the notch on the side of the inclined column (2); Step 15: Install the secondary bifurcated column (31), hoist the third bifurcated column to the top of the second bifurcated column, and fix the bottom end of the third bifurcated column to the top of the second bifurcated column; hoist the tee column (32) to the top of the first bifurcated column, and fix the bottom end of the tee column (32) to the top of the first bifurcated column; hoist the fourth bifurcated column and the fifth bifurcated column in sequence and install them on the top of the tee column (32); Step 16: Install a top crossbeam (33), whereby tops of the third bifurcated column, the fourth bifurcated column, and the fifth bifurcated column are connected in pairs via a top crossbeam (33) to form a triangular stable structure; Step 17: Install the conversion truss (7), relying on the three top beams (33) to build the conversion truss (7) upwards; Step 18, remove the temporary support, and remove the temporary support built on the top of the support frame (9).

Images