Tower top hoisting device for irregular tower top of large-span cable-stayed bridge

Abstract

The utility model discloses a tower top hoisting device for an irregular tower top of a large-span cable-stayed bridge. The main beam and the stand column are anchored on the cable bent tower through anchoring points, the force bearing beam is connected to the main beam, and the stiffening plates are connected to the two sides of the force bearing beam and connected to the main beam at the same time. The pulley block is hung on the bearing beam, the adjustable telescopic rod is hinged to the main beam, and the steel wire rope and the adjustable telescopic rod are connected with the support node through the connecting node. The device can fully utilize the tower top structure of the cable-stayed bridge tower, and is suitable for irregular tower tops with various shapes and designs; the structural state of the tower top crane device is adjusted to adapt to external load and structural state changes by actively controlling the adjustable telescopic rod, the girder bending moment and structural deformation can be reduced while the structural bearing capacity can be remarkably improved, the expected working target is achieved, the problem that an irregular cable-stayed bridge tower top crane is difficult to install is effectively solved, and the tower top crane has the advantages of being convenient to install and high in practicability. The construction period is short, and materials are saved.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge construction facilities, in particular to a high-adaptive tower top hanging device for quickly replacing irregular tower tops of large-span cable-stayed bridges. Background Art

[0002] Cable-stayed bridges have the advantages of large spanning capacity, low material consumption, simple construction, and beautiful appearance. They have been widely and rapidly applied and developed in bridge construction at home and abroad. The cable system of a cable-stayed bridge is a crucial component of its structure and is responsible for bearing the main bridge load. However, as time goes by, due to the influence of environmental and traffic factors during the actual operation period, the performance of the cable will significantly decline. In order to ensure the operational safety of the bridge structure, the cable needs to be replaced when necessary.

[0003] The tower crane is the main lifting equipment for the tower top. During the cable-stayed cable replacement construction, it is used to lower the anchor head of the old cable tower to the bridge deck and lift the anchor head of the new cable tower to the cable sleeve mouth of the tower end for hanging. However, the early designs of cable-stayed bridge towers have various shapes and irregular tower top structures, which bring great difficulties to the installation of tower cranes. Traditional tower cranes are single in form and complex to install, which is difficult to meet construction requirements. Therefore, it is necessary to fully combine the different cable-stayed bridge tower top structures and design a tower crane device that can be applied to various types of tower top structures. Utility Model Content

[0004] In order to solve the problems in the background technology, the utility model provides a tower top structure suitable for various types of irregular cable-stayed cable towers, which can make full use of the tower top structure, has a simple structure, is easy to install, and has a short construction period, and can be widely used in various types of cable replacement projects.

[0005] The technical solution adopted by the utility model is as follows, and the device comprises:

[0006] The main beam includes a main beam I and a main beam II arranged in parallel. The main beam I is installed on the top surface of the tower through a column, and the main beam II is directly installed on the top surface of the tower. Both ends of the main beam extend to the side of the tower top.

[0007] Two symmetrically arranged beam string structures are installed above the main beam I and the main beam II respectively, and the two beam string structures are connected by transverse support rods;

[0008] A plurality of equally spaced stiffening rods Ⅰ are connected between the main beam Ⅰ and the main beam Ⅱ;

[0009] Multiple load-bearing beams are symmetrically arranged on the left and right sides of the main beam, and the front and rear ends of the load-bearing beams are respectively connected to the main beam I and the main beam II.

[0010] The beam-string structure is composed of steel cables, actuators, adjustable telescopic rods and main beam I or main beam II; multiple steel cables are hingedly connected through multiple connecting node plates to form an upper chord tension member, and the two ends of the upper chord tension member are respectively connected to the two ends of the main beam through support node plates, and multiple actuators corresponding to the positions of the multiple connecting node plates are installed on the main beam, and a vertically arranged adjustable telescopic rod is connected between each actuator and the corresponding connecting node plate; two beam-string structures are connected to each other through transverse support rods to form a beam-string force system with spatial support as the main support, wherein the transverse support rods are connected to the connecting node plates of the two beam-string structures.

[0011] The height of the tower top surface corresponding to the main beam II is higher than the height of the tower top surface corresponding to the main beam I.

[0012] A set of oblique stiffening rods II is connected between two adjacent stiffening rods I on the left side of the main beam and between two adjacent stiffening rods I on the right side, and the two sets of oblique stiffening rods II on the left and right sides are symmetrically arranged;

[0013] Each group of oblique stiffening rods II consists of two oblique stiffening rods II, one end of each of the two oblique stiffening rods II is connected to the middle of one of the stiffening rods I, and the other ends of the two oblique stiffening rods II are respectively connected to the front end and the rear end of another stiffening rod I.

[0014] The front and rear ends of the load-bearing beam are fixed above the main beam, and the front and rear ends of the stiffening rod I are fixed on the inner side of the main beam.

[0015] Oblique stiffening plates are fixed on both sides of the end of the load-bearing beam, and the upper and lower ends of each stiffening plate are respectively connected to the load-bearing beam and the main beam; a pulley block is hung on the load-bearing beam.

[0016] Two diagonal rods and a transversely arranged cross bar are connected between the two columns supporting the main beam I; the two ends of the cross bar are respectively connected to the middle of the two columns; one end of one of the diagonal rods is connected to the connection position between the top of the column and the main beam I, and the other end is connected to the connection position between the cross bar and the column; one end of the other diagonal rod is connected to the bottom end of the column, and the other end is connected to the connection position between the cross bar and the column; a cross brace arranged parallel to the stiffening rod I is connected between the column and the cable tower.

[0017] The main beam, diagonal braces, columns and transverse braces are all fixed on the cable tower through anchor points.

[0018] The main beams, load-bearing beams, stiffening plates, diagonal braces, columns, cross bars, diagonal bars, stiffening rods I, diagonal stiffening rods II and cross braces are all steel components, and the cross-sectional forms include but are not limited to I-beams, double I-beams, angle steels, and channel steels.

[0019] The beneficial effects of the utility model are:

[0020] The utility model actively controls the adjustable telescopic rod to adjust the structural state of the tower top crane to adapt to the external load and structural state changes, which can significantly improve the structural bearing capacity while reducing the main beam bending moment and structural deformation, achieving the expected working goal.

[0021] The utility model device can make full use of the top structure of the cable-stayed bridge tower and adapt to irregular tower tops of various shapes and designs. Through flexible adjustment, it can ensure that the equipment can effectively adapt to the replacement of cable-stayed cables of different structures. The device takes into account the special shape of the irregular tower top to ensure the safe and stable replacement of the cable-stayed cable. This helps to minimize potential risks and problems during construction, improve the safety of the project, and thus achieve efficient and safe cable-stayed cable replacement.

[0022] The utility model device simplifies the tower top crane structure to the maximum extent, effectively solves the problem of difficult installation of the tower top crane of an irregular cable-stayed bridge cable tower, and has the advantages of convenient installation, short construction period and material saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is the main view of the utility model device Figure 1 .

[0024] Figure 2 It is the main view of the utility model device Figure 2 .

[0025] Figure 3 It is a top view of the device of the utility model.

[0026] Figure 4 It is a side view of the device of the utility model.

[0027] Figure 5 It is a simplified diagram of the mechanical analysis of the beam string structure of the utility model device.

[0028] In the figure: 1, cable tower, 2, main beam I, 3, load-bearing beam, 4, stiffening plate, 5, connection node plate, 6, steel cable, 7, pulley block, 8, anchor point, 9, column, 10, cross bar, 11, diagonal bar, 12, main beam II, 13, stiffening rod I, 14, diagonal stiffening rod II, 15, cross brace, 16, actuator, 17, adjustable telescopic rod, 18, support node plate, 19, transverse support rod DETAILED DESCRIPTION

[0029] The utility model is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] like Figure 1 to Figure 4As shown, the utility model includes a cable tower 1, a main beam, a load-bearing beam 3, a stiffening plate 4, a connecting node plate 5, a steel cable 6, a pulley block 7, an anchor point 8, a column 9, a cross bar 10, an oblique bar 11, a transverse stiffening rod 13, an oblique stiffening rod 14, a cross brace 15, an actuator 16, an adjustable telescopic rod 17, a support node plate 18 and a transverse support rod 19.

[0031] The main beam includes a main beam I2 and a main beam II12 arranged in parallel. The main beam I2 is installed on the top surface of the tower 1 through the column 9, and the main beam II12 is directly installed on the top surface of the tower 1. Both ends of the main beam extend outside the tower top and are connected to the two side surfaces of the tower top through diagonal braces.

[0032] The load-bearing beam 3 is connected to the main beam, and the stiffening plate 4 is connected to both sides of the load-bearing beam and to the main beam at the same time. The pulley block 7 is suspended on the load-bearing beam 3. The steel cable 6, the actuator 16, the adjustable telescopic rod 17, the connecting node plate 5 and the support node plate 18 form a beam string structure. Two symmetrically arranged beam string structures are installed above the main beam Ⅰ2 and above the main beam Ⅱ12 respectively, and the two beam string structures are connected by a transverse support rod 19.

[0033] The columns 9 and cross braces 15 are fixed to the cable tower 1 through anchor points 8; the cross bars 10 and cross braces 15 are connected to the columns 9, and the diagonal bars 11 are connected to the columns 9 and the main beams 12 to enhance the stability of the structure.

[0034] The transverse stiffening rods 13 are respectively connected to the main beam I2 and the main beam II12 to strengthen the connection between the main beam I2 and the main beam II12.

[0035] The oblique stiffening rod 14 is connected between two different transverse stiffening rods 13 .

[0036] In a specific implementation, the form of the anchor point 8 includes but is not limited to chemical anchor bolts, and other anchoring methods are also within the scope of protection of this patent.

[0037] The main beam, load-bearing beam 3, stiffening plate 4, column 9, cross bar 10, diagonal bar 11, transverse stiffening rod 13, diagonal stiffening rod 14, cross brace 15, and transverse support rod 19 are all steel components, and the cross-sectional forms include but are not limited to I-beams, double I-beams, angle steels, channel steels, etc.

[0038] The pulley block 7 is a fixed pulley, 4 of which are arranged on both sides, and the position of the pulley can be adjusted along the direction of the load-bearing beam 3.

[0039] The actuator 16 utilizes the material properties of smart materials to convert light, electricity, sound, heat, magnetism, etc. into mechanical motion of the actuator, including but not limited to shape memory alloys, electrorheological materials, magnetorheological materials, piezoelectric materials, electrostrictive materials, and magnetostrictive materials, etc. Among them, piezoelectric materials are widely used in various smart structures due to their high sensitivity, wide operating frequency, stable performance, low cost, and easy processing and forming.

[0040] The adjustable telescopic rod 17 is a circular cross-section steel pipe and the mounting support node plate 18 is a square cross-section steel member, which is used for fast replacement of irregular tower tops of large-span cable-stayed bridges. The high-adaptive tower top hanging device 5 is a spherical steel cast iron connector.

[0041] Example:

[0042] First, each component is transported to the top of the tower by a small hoist. Then, it is installed in the following order:

[0043] First, install the column 9 and fix it to the cable tower 1 through the anchor point 8; then install the crossbar 10, the diagonal bar 11 and the cross brace 15, and the cross brace 15 is fixed to the cable tower 1 through the anchor point 8; then install the main beam Ⅰ2 and the main beam Ⅱ12, the main beam Ⅰ2 is connected to the column 9 and the diagonal bar 11, and the main beam Ⅱ12 is directly fixed to the cable tower 1 through the anchor point 8. Next, install the stiffening rod Ⅰ13 and the diagonal stiffening rod Ⅱ14. Then connect the load-bearing beam 3 to the main beam Ⅰ2 and the main beam Ⅱ12, connect the stiffening plate 4, and hang the pulley block 7 on the load-bearing beam 3.

[0044] Finally, install the beam string structure: install the actuator 16 and the adjustable telescopic rod 17 on the main beam, then install the support node plate 18 and the connecting node plate 5, and connect the steel cable 6 to the connecting node plate 5 in sequence through the anchor cable heads at both ends to complete the installation of the beam string structure. When the two beam string structures attached to the main beam Ⅰ2 and the main beam Ⅱ12 are installed, install the transverse support rod 19.

[0045] The high adaptive tower top hanging device of the utility model is an adaptive tension structure. By actively controlling the adjustable telescopic rod to adjust the prestress value of the steel cable 6 to adapt to the external load and structural state changes, it can significantly improve the structural bearing capacity while reducing the main beam bending moment and structural deformation, achieving the expected working goal. The specific working process is: when the size of the external load P acting on the pulley block 7 changes, that is, the working state of the structure changes, the length of the adjustable telescopic rod 17 is adjusted by the actuator 16, and the prestress value of the steel cable is optimized and adjusted to achieve the purpose of changing the working state of the structure.

[0046] The prestressing value of the steel cable and the internal force of the main beam can be optimized and adjusted through existing technologies, specifically:

[0047] Sensitivity analysis of the structural finite element equation considering the coupling effect of the actuator unit is used to establish an optimization model for the control of the beam string structure. The optimization algorithm of the model includes but is not limited to genetic algorithms, simulated annealing and other intelligent algorithms to search for the optimal solution to solve the linear control problem of the structure.

[0048] The structure is also restricted by the material properties of each component, the overall coordination of the structure and the mechanical properties of the actuator. The optimization model of the beam string structure control is constructed with the most reasonable internal force state or the most reasonable displacement state as the control target. The mechanical model is as follows: Figure 5 The adjustable telescopic rod, the setting of the steel cable and the introduction of prestress are all to improve the working performance of the main beam. The internal force working state of the structure after adjustment is f F (e a ) and displacement working state f D (e a ) can be expressed as the maximum stress σ of the main beam I or the main beam II max and the maximum displacement d max To describe:

[0049] f F (e a )=σ max =max(σ B (x)

[0050] f D (e a ) = d max =max(d B (x)

[0051] The internal force control optimization model with the most reasonable internal force state as the control target in the adaptive beam string structure is obtained:

[0052] min[f F (e a )]

[0053]

[0054] Or the displacement control optimization model with the most reasonable displacement state as the control target:

[0055] min[f D (e a )]

[0056]

[0057] In the formula, and are the lower and upper limits of displacement of the beam string structure, respectively; and are the allowable compressive stress and tensile stress of the main beam in the x direction respectively; and is the allowable stress in compression and the allowable stress in tension of the jth adjustable strut, and the embodiment of the utility model is provided with three adjustable struts C1, C2 and C3; and are the minimum stress and allowable tensile stress of the kth cable without quitting work respectively; and are the lower and upper limits of the actuator corresponding to the jth adjustable strut. d, σ B (x), d B (x),σ Tj , σ Ck and e aj are the displacement of the structure, the working stress on the main beam at x, the structural displacement on the main beam at x, the working stress of the j-th adjustable strut, the working stress of the k-th cable, and the actuation of the actuator corresponding to the j-th adjustable strut, where:

[0058]

[0059] Where N B (x) and M B (x) are the axial force of the main beam in the x direction and the bending moment at both ends, A B (x) and W B (x) are the cross-sectional area and inertia modulus of the main beam at x respectively; N Tj,L and A Tj are the axial force and cross-sectional area of ​​the jth adjustable strut, respectively; N Ck,L and A Ck are the axial force and cross-sectional area of ​​the kth cable respectively.

[0060] All connection forms of the utility model include but are not limited to welding and bolt connection, and other connection forms are also within the scope of protection of this patent. The arrangement of the main beam I and the main beam II includes but is not limited to the arrangement described in the utility model, which can be adjusted according to the tower top form of the cable-stayed bridge tower, and in principle, the original tower top structure is fully utilized. The arrangement of the columns includes but is not limited to the arrangement described in the utility model, which can be adjusted according to the tower top form of the cable-stayed bridge tower, and in principle, the original tower top structure is fully utilized.

Claims

1. A tower top hanging device for irregular tower top of a long-span cable-stayed bridge, characterized in that: include: The main beam comprises a main beam I (2) and a main beam II (12) arranged in parallel, the main beam I (2) being installed on the top surface of the cable tower (1) through a column (9), and the main beam II (12) being directly installed on the top surface of the cable tower (1); both ends of the main beam extend to the side of the tower top; Two symmetrically arranged beam string structures are respectively installed above the main beam I (2) and above the main beam II (12), and the two beam string structures are connected by a transverse support rod (19); A plurality of equally spaced stiffening rods I (13) are connected between the main beam I (2) and the main beam II (12); A plurality of load-bearing beams (3) are symmetrically arranged on the left and right sides of the main beam, and the front and rear ends of the load-bearing beams (3) are respectively connected to the main beam I (2) and the main beam II (12).

2. The tower top hanging device for irregular tower top of a long-span cable-stayed bridge according to claim 1, characterized in that: The beam string structure is composed of a steel cable (6), an actuator (16), an adjustable telescopic rod (17) and a main beam I (2) or a main beam II (12); A plurality of steel cables (6) are hingedly connected through a plurality of connection node plates (5) to form an upper chord tension member, the two ends of the upper chord tension member are respectively connected to the two ends of the main beam through a support node plate (18), a plurality of actuators (16) corresponding to the positions of the plurality of connection node plates (5) are installed on the main beam, and a vertically arranged adjustable telescopic rod (17) is connected between each actuator and the corresponding connection node plate (5); The two beam string structures are connected to each other via a transverse support rod (19) to form a beam string force system with spatial support as the main support, wherein the transverse support rod (19) is connected to the connection node plates (5) of the two beam string structures.

3. The tower top hanging device for irregular tower top of a long-span cable-stayed bridge according to claim 1 is characterized in that: The height of the tower top surface corresponding to the main beam II (12) is higher than the height of the tower top surface corresponding to the main beam I (2).

4. The tower top hanging device for irregular tower top of a long-span cable-stayed bridge according to claim 1, characterized in that: A group of oblique stiffening rods II (14) is connected between two adjacent stiffening rods I (13) on the left side of the main beam and between two adjacent stiffening rods I (13) on the right side, and the two groups of oblique stiffening rods II (14) on the left and right are symmetrically arranged; Each group of oblique stiffening rods II (14) is composed of two oblique stiffening rods II (14), one end of each of the two oblique stiffening rods II (14) is connected to the middle of one of the stiffening rods I (13), and the other ends of the two oblique stiffening rods II (14) are respectively connected to the front end and the rear end of the other stiffening rod I (13).

5. The tower top hanging device for irregular tower top of long-span cable-stayed bridge according to claim 1, characterized in that: The front and rear ends of the load-bearing beam (3) are fixed on the top of the main beam, and the front and rear ends of the stiffening rod I (13) are fixed on the inner side of the main beam.

6. The tower top hanging device for irregular tower top of long-span cable-stayed bridge according to claim 1, characterized in that: Oblique stiffening plates (4) are fixed on both left and right sides of the end of the load-bearing beam (3), and the upper and lower ends of each stiffening plate (4) are respectively connected to the load-bearing beam (3) and the main beam; a pulley block (7) is suspended on the load-bearing beam (3).

7. The tower top hanging device for irregular tower top of a long-span cable-stayed bridge according to claim 1, characterized in that: Two oblique rods (11) and a transversely arranged crossbar (10) are connected between the two columns (9) supporting the main beam I (2); both ends of the crossbar (10) are respectively connected to the middle of the two columns (9); One end of one of the diagonal rods is connected to the connection position between the top end of the column (9) and the main beam I (2), and the other end is connected to the connection position between the cross bar (10) and the column (9); one end of the other diagonal rod is connected to the bottom end of the column (9), and the other end is connected to the connection position between the cross bar (10) and the column (9); A transverse brace (15) arranged parallel to the stiffening rod I (13) is connected between the upright column (9) and the cable tower.

8. The tower top hanging device for irregular tower top of a long-span cable-stayed bridge according to claim 1, characterized in that: The main beam, diagonal braces, columns (9) and transverse braces (15) are all fixed to the cable tower (1) via anchor points (8).

9. The tower top hanging device for irregular tower top of a long-span cable-stayed bridge according to claim 1, characterized in that: The main beam, load-bearing beam (3), stiffening plate (4), diagonal brace, column (9), cross bar (10), diagonal bar (11), stiffening rod I (13), diagonal stiffening rod II (14) and cross brace (15) are all steel components, and the cross-sectional forms include but are not limited to I-beams, double I-beams, angle steels and channel steels.

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