Integral lifting device and lifting method for large-span special-shaped grid structure

Abstract

The present invention belongs to the technical field of overall jacking of large-span special-shaped grid structures, and specifically relates to an overall jacking device and a jacking method for large-span special-shaped grid structures; the jacking device comprises a jacking unit; each jacking unit comprises a supporting ball node, a conversion strut, a jacking mechanism, a column and an anchor pull box, the supporting ball node is located directly above the centroid of the jacking point grid of the special-shaped grid structure, the supporting ball node is connected to the rod node of the jacking point grid through the conversion strut, and the jacking mechanism is located directly below the supporting ball node; the column is erected on the top of the supporting ball node, the anchor pull box is fixed on the top of the column, the anchor pull box is connected to the rod node outside the jacking point grid with an inclined cable, and the anchor pull boxes are mutually tied by horizontal cables; the present invention is suitable for the jacking condition of large-span special-shaped grid structures, and during the jacking process, the large-span special-shaped grid structure is subjected to uniform force, ensuring that the large-span special-shaped grid structure is safely positioned as a whole.

Description

Technical Field

[0001] The present invention belongs to the technical field of overall jacking of large-span special-shaped grid structures, and in particular relates to an overall jacking device and a jacking method for large-span special-shaped grid structures. Background Art

[0002] With the development of cultural diversity, a large number of buildings with great artistic atmosphere have emerged. More and more single-layer special-shaped grid structures are used in the roof structures of large-space public buildings. This not only solves the problem of structural maintenance, uses steel economically, meets the needs of large spans, and meets the pursuit of visual effects. However, it brings great challenges to construction. If a single-layer large-span grid structure is put in place by multiple cranes, it will have high requirements for the space of the construction site. Usually, the conditions of the construction site are not met. At the same time, it has high requirements for the synchronization of the cranes, and the safety risks are high. During the lifting process, the deflection of the grid structure cannot be effectively controlled. The block lifting method requires the establishment of more temporary cradles, which is costly. Because the grid structure is a special-shaped design, it is not suitable for the use of jacking and other methods. Therefore, it is necessary to invent an installation method to solve the problem of installing large-span special-shaped grid structures in place. Summary of the invention

[0003] The purpose of the present invention is to control the overall deformation of a large-span special-shaped grid structure during the lifting process, to achieve the overall positioning of the large-span special-shaped grid structure, and to reduce the difficulty of installation.

[0004] The present invention provides the following technical solutions: an overall jacking device for a large-span special-shaped grid structure, comprising jacking units arranged at intervals within the plane of the special-shaped grid structure, the jacking units being used to coordinately and vertically jack up the special-shaped grid structure;

[0005] Each jacking unit includes a support ball node, a conversion strut, a jacking mechanism, a column and an anchor pull box. The support ball node is located directly above the centroid of the jacking point grid of the special-shaped grid structure. The support ball node is connected to the rod node of the jacking point grid through the conversion strut, and the jacking mechanism is located directly below the support ball node.

[0006] The column is erected on the top of the supporting ball node, the anchor box is fixed on the top of the column, the inclined cable is connected between the anchor box and the rod node outside the jacking point grid, and the anchor boxes are tied to each other by horizontal cables.

[0007] Furthermore, a reinforced node plate is provided on the upper flange of the rod node of the jacking point grid, and the distance between the short side end of the reinforced node plate and the corner point position of the rod node is at least 200 mm; the conversion brace is connected to the reinforced node plate.

[0008] Furthermore, each anchor pull box is connected to inclined cables in four directions, and the horizontal cables between three adjacent anchor pull boxes are connected to form a triangle.

[0009] Furthermore, two rows of lifting units are arranged on the special-shaped grid structure; the anchor box has four anchor end faces, and the four anchor end faces are arranged in a circular array around the column as the center. Each anchor end face has upper and lower cable holes, the upper cable hole is connected to the horizontal cable, and the lower cable hole is connected to the oblique cable.

[0010] Furthermore, the anchor box includes a bottom plate, a rectangular box body and a U-shaped box body. The tops of the rectangular box body and the U-shaped box body are open and the bottoms are connected to the bottom plate. The bottom plate is connected to the column. A U-shaped box body is connected to the middle of each long side of the rectangular box body. The outer end plates of the rectangular box body and the U-shaped box body serve as anchor end faces. Top triangular stiffening ribs and bottom triangular stiffening ribs are provided at the angles between the rectangular box body and the U-shaped box body.

[0011] Furthermore, a first stiffening rib is connected between the column and the supporting ball node, and the first stiffening rib is evenly distributed around the column.

[0012] Furthermore, a second stiffening rib is connected between the column and the bottom plate of the anchor pull box, and the second stiffening rib is evenly distributed around the column.

[0013] Furthermore, the height difference from the supporting ball node to the upper flange of the special-shaped grid structure is 2.5m, and the length of the column is 4m.

[0014] A method for integrally lifting a large-span special-shaped grid structure comprises the following steps:

[0015] S1: Install the large-span special-shaped grid structure integral jacking device in the special-shaped grid structure;

[0016] S2: Before the special-shaped grid structure is lifted, the internal force of each inclined cable and horizontal cable under the construction condition is simulated and analyzed by the structural design software. Before construction, each inclined cable and horizontal cable is pre-tensioned by a jack to apply the corresponding prestress;

[0017] S3: The lifting unit lifts the special-shaped grid structure into place synchronously;

[0018] S4: After the special-shaped grid structure is installed in place, the overall jacking device of the large-span special-shaped grid structure is removed.

[0019] Compared with the prior art, the advantages of the present invention are:

[0020] The present invention is suitable for the jacking condition of large-span special-shaped grid structures. The oblique cables in the overall jacking device of the large-span special-shaped grid structure effectively control the deformation of the grid, and the horizontal cables effectively control the horizontal displacement of the tooling combination composed of the columns and the anchor pull boxes. During the jacking process, the large-span special-shaped grid structure is subjected to uniform force, ensuring that the large-span special-shaped grid structure is safely in place as a whole. The overall jacking device of the large-span special-shaped grid structure can be used repeatedly, which is energy-saving and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a top view of the overall jacking device of the large-span special-shaped grid structure;

[0022] Figure 2 It is a schematic diagram of the connection between the support ball node and the jacking point grid;

[0023] Figure 3 This is a schematic diagram of the connection between the anchor pull box and the support ball node;

[0024] Figure 4 It is a schematic diagram of the position of the lifting mechanism;

[0025] Figure 5 This is a three-dimensional diagram of the anchor pull box;

[0026] Figure 6 This is a front view of the anchor pull box;

[0027] Figure 7 Schematic diagram of the inclined cables and horizontal cables.

[0028] In the figure: 1-support ball node; 2-conversion strut; 3-lifting mechanism; 4-column; 5-anchor box; 5.1-bottom plate; 5.2-rectangular box; 5.3-U-shaped box; 5.4-top triangular stiffening rib; 5.5-bottom triangular stiffening rib; 6-oblique cable; 7-horizontal cable; 8-reinforcement node plate; 9-anchor end face; 10-cable hole; 11-first stiffening rib; 12-second stiffening rib; 13-special-shaped grid structure. DETAILED DESCRIPTION

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Example 1

[0031] like Figure 1~Figure 4 As shown: a large-span special-shaped grid structure overall lifting device, including lifting units arranged at intervals within the plane range of the special-shaped grid structure 13, the lifting units are used to coordinate and vertically lift the special-shaped grid structure 13;

[0032] Each jacking unit includes a support ball node 1, a conversion strut 2, a jacking mechanism 3, a column 4 and an anchor pull box 5. The support ball node 1 is located directly above the centroid (geometric center of the cross-sectional figure) of the jacking point grid of the special-shaped grid structure 13. The support ball node 1 is connected to the rod node of the jacking point grid through the conversion strut 2. The jacking mechanism 3 is located directly below the support ball node 1.

[0033] The column 4 is erected on the top of the supporting ball node 1, the anchor box 5 is fixed on the top of the column 4, the inclined cable 6 is connected between the anchor box 5 and the rod node outside the jacking point grid, the inclined cable 6 is connected to the ear plate at the top of the rod, and the anchor boxes 5 are connected to each other by horizontal cables 7.

[0034] The upper flange of the rod node of the jacking point grid is provided with a reinforced node plate 8, and the short side end of the reinforced node plate 8 is at least 200 mm away from the corner point of the rod node; the conversion brace 2 is connected to the reinforced node plate 8. The specification of the reinforced node plate 8 is a 20 mm thick Q355B steel plate. The reinforced node plate 8 is added to enhance the bearing capacity and stability of the load-bearing node, and provides a welding working surface for the bottom surface of the conversion brace 2 to prevent damage to the parent material when the conversion brace 2 is removed after the special-shaped grid structure 13 is in place.

[0035] The height difference from the supporting ball node 1 to the upper flange of the special-shaped grid structure 13 is 2.5m. The supporting ball node 1 adopts a welded hollow ball with a diameter of 500mm and a wall thickness of 20mm. The conversion strut 2 adopts a 140*6 round tube made of Q355B. The upper part of the conversion strut 2 is welded to the supporting ball node 1, and the lower part is welded to the reinforcement node plate 8. The weld quality grade is level 2.

[0036] like Figure 7 As shown: each anchor box 5 is connected to inclined cables 6 in four directions, and horizontal cables 7 between three adjacent anchor boxes 5 are connected to form a triangle. The anchor boxes 5 are mutually tied by horizontal cables 7, and the columns 4 are set to form a triangular static structure, which interacts with each other to provide a reaction force to resist deformation out of the plane, thereby avoiding a large offset at the top of the column 4.

[0037] Two rows of lifting units are arranged on the special-shaped grid structure 13; the anchor box 5 has four anchor end faces 9, and the four anchor end faces 9 are arranged in a circular array around the column 4. Each anchor end face 9 has upper and lower cable holes 10, the upper cable hole 10 is connected to the horizontal cable 7, and the lower cable hole 10 is connected to the oblique cable 6.

[0038] In the overall jacking device for large-span special-shaped grid structures, the column 4 on the upper part of the support ball node 1 is a cantilever structure. Under the action of the inclined cable 6, there is an offset at the top of the column 4, which affects the construction safety of the jacking condition and the linear shape of the grid structure. A first stiffening rib 11 is connected between the column 4 and the support ball node 1, and the first stiffening rib 11 is evenly distributed around the column 4. The height of the first stiffening rib 11 is 250mm and the width is 150mm. The lower part of the first stiffening rib 11 is cut into an intersecting line with the support ball node 1, and is welded with equal strength penetration to make the column foot of the column 4 rigidly connected to resist part of the bending moment.

[0039] A second stiffening rib 12 is connected between the column 4 and the bottom plate 5 . 1 of the anchor box 5 . The second stiffening rib 12 is evenly distributed around the column 4 .

[0040] During the multi-point lifting process of the special-shaped grid structure 13, each grid will have different degrees of deflection due to different stiffness, and the deflection is relatively large. A 4m high column 4 is set on the upper part of the supporting ball node 1. The specification of the column 4 is 159*4. An anchor box 5 is set on the top of the column 4. The anchor box 5 is made of 16mm thick steel plate. Figure 5 , Figure 6 As shown: the anchor box 5 includes a bottom plate 5.1, a rectangular box body 5.2 and a U-shaped box body 5.3. The tops of the rectangular box body 5.2 and the U-shaped box body 5.3 are open, and the bottoms are connected to the bottom plate 5.1. The bottom plate 5.1 is connected to the column 4. A U-shaped box body 5.3 is connected to the middle of the long sides of both sides of the rectangular box body 5.2. The outer end plates of the rectangular box body 5.2 and the U-shaped box body 5.3 serve as anchor end faces 9. Top triangular stiffening ribs 5.4 and bottom triangular stiffening ribs 5.5 are provided at the angles between the rectangular box body 5.2 and the U-shaped box body 5.3 to enhance the coordinated force bearing capacity of the anchor box 5 and control deformation.

[0041] The large-span special-shaped grid structure overall lifting device of this embodiment is suitable for the lifting condition of special-shaped grid structures. The grid is evenly stressed, ensuring the overall lifting safety of the grid structure. In this embodiment, various types of tooling have many welding connections. After the welding process is completed, non-destructive testing of the weld is performed as required.

[0042] Example 2

[0043] A method for integrally lifting a large-span special-shaped grid structure comprises the following steps:

[0044] S1: installing the large-span special-shaped grid structure integral jacking device of Example 1 in the special-shaped grid structure 13;

[0045] S2: Before the special-shaped grid structure 13 is lifted, the internal force of each inclined cable 6 and horizontal cable 7 under the construction condition is simulated and analyzed by the structural design software, and each inclined cable 6 and horizontal cable 7 is pre-tensioned by a jack before construction to apply corresponding prestress;

[0046] S3: The lifting unit lifts the special-shaped grid structure 13 into place synchronously;

[0047] S4: After the special-shaped grid structure 13 is installed in place, the overall jacking device of the large-span special-shaped grid structure is removed.

[0048] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A large-span special-shaped grid structure overall lifting device, characterized by: It comprises lifting units which are arranged at intervals within the plane of the special-shaped grid structure (13), and the lifting units are used to coordinately and vertically lift the special-shaped grid structure (13); Each lifting unit comprises a supporting ball node (1), a conversion strut (2), a lifting mechanism (3), a column (4) and an anchor pull box (5); the supporting ball node (1) is located directly above the centroid of the lifting point grid of the special-shaped grid structure (13); the supporting ball node (1) and the rod node of the lifting point grid are connected via the conversion strut (2); and the lifting mechanism (3) is located directly below the supporting ball node (1); The column (4) is erected on the top of the support ball node (1), the anchor box (5) is fixed on the top of the column (4), the anchor box (5) and the rod node outside the jacking point grid are connected by an inclined cable (6), and the anchor boxes (5) are mutually tied by a horizontal cable (7); Each of the anchor pull boxes (5) is connected to inclined cables (6) in four directions, and the horizontal cables (7) between three adjacent anchor pull boxes (5) are connected to form a triangle; Two rows of lifting units are arranged on the special-shaped grid structure (13); the anchor pull box (5) has four anchor pull end faces (9), and the four anchor pull end faces (9) are arranged in a circular array around the column (4) as the center, and each anchor pull end face (9) has upper and lower cable holes (10), the upper cable hole (10) is connected to the horizontal cable (7), and the lower cable hole (10) is connected to the inclined cable (6); The anchor box (5) comprises a bottom plate (5.1), a rectangular box body (5.2) and a U-shaped box body (5.3); the tops of the rectangular box body (5.2) and the U-shaped box body (5.3) are open and the bottoms are connected to the bottom plate (5.1); the bottom plate (5.1) is connected to the column (4); a U-shaped box body (5.3) is connected to the middle of the long sides of both sides of the rectangular box body (5.2); the outer end plates of the rectangular box body (5.2) and the U-shaped box body (5.3) serve as anchor end faces (9); and top triangular stiffening ribs (5.4) and bottom triangular stiffening ribs (5.5) are provided at the angle between the rectangular box body (5.2) and the U-shaped box body (5.3).

2. The large-span special-shaped grid structure integral lifting device according to claim 1 is characterized in that: A reinforcing node plate (8) is provided on the upper flange of the rod node of the jacking point grid, and the distance between the short side end of the reinforcing node plate (8) and the corner point position of the rod node is at least 200 mm; the conversion brace (2) is connected to the reinforcing node plate (8).

3. The large-span special-shaped grid structure integral lifting device according to claim 1 is characterized in that: A first stiffening rib (11) is connected between the upright column (4) and the supporting ball node (1), and the first stiffening rib (11) is evenly distributed around the upright column (4).

4. The large-span special-shaped grid structure integral lifting device according to claim 1 is characterized in that: A second stiffening rib (12) is connected between the upright column (4) and the bottom plate (5.1) of the anchor box (5), and the second stiffening rib (12) is evenly distributed around the upright column (4).

5. The large-span special-shaped grid structure integral lifting device according to claim 1 is characterized in that: The height difference between the supporting ball node (1) and the upper flange of the special-shaped grid structure (13) is 2.5 m, and the length of the column (4) is 4 m.

6. A method for integrally lifting a large-span special-shaped grid structure, characterized in that: The following steps are involved: S1: installing the large-span special-shaped grid structure integral lifting device according to claim 1 in the special-shaped grid structure (13); S2: Before the special-shaped grid structure (13) is lifted, the internal force of each inclined cable (6) and horizontal cable (7) under the construction condition is simulated and analyzed by the structural design software, and each inclined cable (6) and horizontal cable (7) is pre-tensioned by a jack before construction to apply corresponding prestress; S3: The lifting unit lifts the special-shaped grid structure (13) into place synchronously; S4: After the special-shaped grid structure (13) is installed in place, the overall jacking device of the large-span special-shaped grid structure is removed.

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