A lifting system used for lifting and installing the main tower steel truss

Abstract

A lifting system used for lifting and installing the steel truss of a main tower includes at least two cushion beams, a main longitudinal beam, at least two through-type jacks, at least two steel strands, a hoist, and at least two vibration absorbing mechanisms. Among them, two cushion beams are arranged on the top surface of the main tower, and the main longitudinal beam is installed on the upper end surface of the cushion beam; two through-type jacks are arranged on the top surface of the main longitudinal beam, each through-type jack fixes a steel strand, and the two steel strands are both hung with the same hoist, and the steel strand is equipped with a vibration absorbing mechanism between the hoist and the main longitudinal beam, and a mass block is arranged inside the vibration absorbing mechanism. The present invention utilizes the vibration absorbing mechanism to make the steel strand and its connector equivalent to a double pendulum series system, so that the main tower steel truss hoisted by the hoist is in the lagging pendulum position in the double series single pendulum system, effectively reducing the swing amplitude of the main tower steel truss, and at the same time greatly improving its motion stability, so that the main tower steel truss can provide a static and stable state for the construction workers during hoisting, so as to implement safe and effective docking work.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge construction, and in particular relates to a lifting system used for lifting and installing a main tower steel truss. Background Art

[0002] With the development of science and technology, the structural forms of bridges in my country are becoming more and more diverse. Among them is a structure in which a large steel truss is set inside the concrete main tower. This type of steel truss often has a large structural weight, many interfaces with the concrete main tower, and high requirements for interface size control, making it very difficult to install. For the installation of this type of main tower steel truss, the existing technology often uses segmented lifting or overall lifting. If segmented lifting is adopted, on-site welding must be carried out, which has the disadvantages of low efficiency, cumbersome procedures, time-consuming and labor-intensive. In addition, the post-welding stress deformation of on-site welding will also cause the shape of the overall steel truss to be distorted, destroying the stability of the bridge body. If qualified steel trusses are made in advance and lifted in whole sections, the volume of the entire main tower steel truss is too large. When it is necessary to accurately locate the position of the installation interface at the end of the lifting stage, once a dimensional deviation occurs, the overly heavy main tower steel truss must be moved and adjusted, and the operation is very troublesome. In addition, the main tower steel truss is prone to shaking during the lifting and adjustment process. Even if the wind near the bridge causes it to be in a slightly shaking state, it is difficult for the construction workers to install and dock it during the shaking process, and there are great operational risks during the operation. Therefore, the various defects existing in the existing main tower steel truss lifting and installation technology urgently need a new technical solution to improve. Summary of the invention

[0003] In view of the above-mentioned deficiencies in the prior art, the present invention provides a lifting system for lifting and installing a main tower steel truss, which is used to achieve safe, accurate and convenient lifting and installation of the main tower steel truss.

[0004] The present invention is implemented through the following technical solutions: A lifting system used for lifting and installing the steel truss of the main tower, including at least two cushion beams, a main longitudinal beam, at least two through-type jacks, at least two steel strands, a sling, and at least two vibration absorbing mechanisms. The two cushion beams are symmetrically arranged at the front and rear end areas of the top surface of the concrete main tower, and the two ends of the main longitudinal beam are fitted and installed on the upper end surfaces of the two cushion beams. A lubricating plate with a lubricating function is provided at the fitting parts of the two ends, so that the main longitudinal beam can fit the lubricating plate to move in the horizontal direction; the two through-type jacks are arranged on the top surface of the main longitudinal beam at a certain interval, and each through-type jack fixes one end of a steel strand, and the other ends of the two steel strands extend downward and pass through the through hole of the main longitudinal beam, and then are suspended with the same The above-mentioned sling, at the same time, each steel strand is equipped with a vibration absorbing mechanism in the area between the sling and the main longitudinal beam, and a mass block is arranged inside the vibration absorbing mechanism, so that the weight hoisted by the sling and the mass block are combined to form a double pendulum series system with the steel strand as the cycloid and the through-type jack as the suspension point, and the weight hoisted by the sling is equivalent to a lagging pendulum, so that part of the external force disturbance suffered by the entire suspension mechanism is absorbed by the mass block and converted into the swing or circular motion of the vibration absorbing mechanism, and at the same time, the swing amplitude or circular motion radius of the lagging pendulum weight is reduced, thereby improving the movement stability of the suspended weight.

[0005] Furthermore, the upper end surface of the cushion beam is provided with multiple longitudinal movement jacks, multiple transverse movement jacks, and multiple reaction seats, wherein the fuselages of the multiple longitudinal movement jacks and the multiple transverse movement jacks are fixed by the reaction seats, the output shafts of the longitudinal movement jacks are all facing the end surface of the main longitudinal beam, the output shafts of the transverse movement jacks are all facing the side surface of the main longitudinal beam, and the multiple reaction seats are fixed to the upper end surface of the cushion beam by welding.

[0006] Furthermore, the through-type jack includes an upper anchor, a main jack, and a lower anchor, wherein the upper anchor, the main jack, and the lower anchor are butt-jointed and installed in a sequential order from top to bottom, the upper anchor and the lower anchor both have the function of anchoring the wire through prestressing, the main jack has a lifting function, and one end of the steel strand passes through the inner holes of the lower anchor, the main jack, and the upper anchor and is fixedly installed through the anchoring functions of the upper anchor and the lower anchor.

[0007] Furthermore, the sling includes a shoulder pole beam, two ear seat plates, two anchor seats, and two pin shafts, wherein an ear seat plate is fixedly installed on both side areas of the upper end surface of the shoulder pole beam, and the anchor seat forms an articulated transmission relationship with the ear seat plate through the assembly of the pin shaft.

[0008] Furthermore, the vibration absorbing mechanism includes a mass block, two anchoring clips, four supports, four rubber wheels, and multiple servo motors, wherein a through hole is provided in the middle of the mass block, the aperture of the through hole matches the outer diameter of the steel strand, and the dimensional error between the two is within the range of +4mm to -0.05mm; the anchoring clip has a wire anchoring function, and two anchoring clips are installed at both ends of the mass block, and the two side areas of the anchoring clip facing the outer side are respectively equipped with a support, and each support is equipped with a rubber wheel in an axial hole matching manner, and the body of the servo motor is fixed on the side wall of the support, and the output shaft of the servo motor forms a transmission relationship with the rubber wheel.

[0009] Furthermore, the portion of the steel strand between the through-type jack and the vibration absorbing mechanism is equivalent to a primary simple cycloid, and the portion of the steel strand between the vibration absorbing mechanism and the hanger is equivalent to a secondary simple cycloid, and the ratio of the primary simple cycloid to the secondary simple cycloid is in the range of 6.5:1 to 1:1.

[0010] Furthermore, the ratio of the weight of the mass block to the weight of the heavy object hoisted by the sling should be ≥0.025.

[0011] Furthermore, the material of the mass block is lead.

[0012] Furthermore, the material of the lubricating plate contains polytetrafluoroethylene.

[0013] Furthermore, the pad is fixed on the top surface of the main tower by welding with embedded parts inside the main tower.

[0014] Furthermore, the reaction seat is fixed on the main longitudinal beam by submerged arc welding.

[0015] Furthermore, when lifting the main tower steel truss, the mechanism of the present invention is provided with one set each on the two side areas of the main tower top surface, and the main tower steel truss is jointly lifted by two sets of the lifting devices provided by the mechanism of the present invention.

[0016] The beneficial effects of the present invention are:

[0017] 1. The present invention utilizes a vibration absorption mechanism to make the steel strands and their connectors equivalent to a double-series single pendulum system, so that the main tower steel truss hoisted by the hoist is in a lagging pendulum position in the double-series single pendulum system, and the external forces caused by disturbance factors such as hoisting, adjustment and wind are borne by the entire single pendulum system. Since the swing amplitude of the lagging pendulum often lags behind the initial pendulum above, part of the disturbing external force is converted into its own single pendulum motion by the mass block in the vibration absorption mechanism, and the swing amplitude of the main tower steel truss in the lagging pendulum position is effectively reduced, while greatly improving its motion stability, so that the main tower steel truss can provide the constructors with a relatively more static and stable state during hoisting and docking, thereby implementing safe and effective docking and installation work, effectively ensuring the construction efficiency and personal safety of bridge manufacturing, and improving the matching accuracy and load performance of bridge facilities, with good social benefits.

[0018] 2. The present invention integrates the lifting, centering, and installation operations of the large main tower steel truss through the sliding, adjusting, and lifting mechanisms between the main longitudinal beams and the pads, providing the industry with an efficient installation solution for the main tower steel truss. The solution has the characteristics of high installation efficiency, good safety, and high interface alignment progress, and is particularly suitable for the lifting and installation of the large main tower steel truss. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a front view of the present invention;

[0020] Figure 2 is a side view of the present invention;

[0021] Figure 3 It is a structural schematic diagram of the through-type jack in the present invention;

[0022] Figure 4 It is a structural schematic diagram of the sling in the present invention;

[0023] Figure 5 It is a structural schematic diagram of the vibration absorbing mechanism in the present invention;

[0024] Figure 6 It is a front view of the present invention in a state of hoisting the main tower steel truss;

[0025] Figure 7 It is a side view of the present invention in a state of hoisting the main tower steel truss;

[0026] Figure 8 It is a front view of the present invention in a state of docking with the main tower steel truss;

[0027] Fig. 9 It is a motion diagram of the vibration absorbing mechanism in the present invention being equivalent to a double pendulum series system.

[0028] In the figure: 1- cushion beam, 1a- longitudinal movement jack, 1b- transverse movement jack, 1c- reaction seat, 2- main longitudinal beam, 2a- lubrication plate, 3- through-type jack, 3a- upper anchor, 3b- main jack, 3c- lower anchor, 4- steel strand, 5- hanger, 5a- shoulder pole beam, 5b- ear seat plate, 5c- anchor seat, 5d- pin shaft, 6- vibration absorption mechanism, 6a- mass block, 6b- anchor clip, 6c- support, 6d- rubber wheel, 6e- servo motor. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0030] like Figure 1-5As shown, a lifting system used for lifting and installing the steel truss of the main tower includes two cushion beams 1, a main longitudinal beam 2, two through-type jacks 3, two steel strands 4, a hanger 5, and two vibration absorbing mechanisms 6. The two cushion beams 1 are symmetrically arranged at the front and rear end areas of the top surface of the concrete main tower, and the two ends of the main longitudinal beam 2 are fitted and installed on the upper end surfaces of the two cushion beams 1. A lubricating plate 2a made of polytetrafluoroethylene is provided at the fitting parts of the two ends, so that the main longitudinal beam 2 can fit the lubricating plate 2a to move in the horizontal direction; the upper end surface of the cushion beam 1 is provided with a plurality of longitudinal jacks 1a, a plurality of transverse jacks 1b, and a plurality of reaction seats 1c, and the fuselages of the plurality of longitudinal jacks 1a and the plurality of transverse jacks 1b are fixed by the reaction seats 1c, and the output shafts of the longitudinal jacks 1a are all facing the end surface of the main longitudinal beam 2, and the output shafts of the transverse jacks 1b are all facing the end surface of the main longitudinal beam 2. All face the side of the main longitudinal beam 2, and multiple reaction seats 1c are fixed to the upper end surface of the cushion beam 1 by submerged arc welding; the two through-type jacks 3 are arranged on the top surface of the main longitudinal beam 2 at a certain interval, including an upper anchor 3a, a main jack 3b, and a lower anchor 3c, wherein the upper anchor 3a, the main jack 3b, and the lower anchor 3c are butt-jointed and installed from top to bottom in sequence, the upper anchor 3a and the lower anchor 3c both have the function of anchoring the wire through prestressing, the main jack 3b has a lifting function, one end of the steel strand 4 passes through the inner holes of the lower anchor 3c, the main jack 3b, and the upper anchor 3a and is fixed and installed through the anchoring function of the upper anchor 3a and the lower anchor 3c. The other ends of the two steel strands 4 extend downward and pass through the through holes of the main longitudinal beam 2, and then are suspended with the same sling 5, which includes a shoulder beam 5a, two ear seat plates 5b, two anchor seats 5c, and two pin shafts 5d, wherein the two side areas of the upper end surface of the shoulder beam 5a are respectively fixed with an ear seat plate 5b, and the anchor seat 5c forms an articulated transmission relationship with the ear seat plate 5b through the assembly of the pin shaft 5d, and the two anchor seats 5c respectively fix the lower ends of the two steel strands 4; at the same time, each steel strand 4 is equipped with a vibration absorbing mechanism 6 in the area between the sling 5 and the main longitudinal beam 2, and the vibration absorbing mechanism 6 includes a mass block 6a, two anchor clips 6b, four supports 6c, four rubber wheels 6d, and multiple servo motors 6e, wherein the material of the mass block 6a is lead, and a through hole is provided in the middle thereof, the aperture of the through hole matches the outer diameter of the steel strand 4, and the dimensional error between the two is within the range of +4mm to -0.05mm, the anchoring clip 6b has a wire anchoring function, and two anchoring clips 6b are installed at both ends of the mass block 6a, and a support 6c is respectively installed on the two side areas of the anchoring clip 6b facing the outer side, and each support 6c is equipped with a rubber wheel 6d in an axial hole matching manner, and the rubber wheel 6d is attached to the outer wall of the steel strand 4, and the body of the servo motor 6e is fixed on the side wall of the support 6c, and the output shaft of the servo motor 6e forms a transmission relationship with the rubber wheel 6d.A mass block 6a is provided inside the vibration absorbing mechanism 6, so that the weight hoisted by the sling 5 is combined with the mass block 6a to form a double pendulum series system with the steel strand 4 as the cycloid and the through-type jack 3 as the suspension point, and the weight hoisted by the sling 5 is equivalent to a lagging pendulum, so that part of the external force disturbance suffered by the entire suspension mechanism is absorbed by the mass block 6a and converted into the swing or circular motion of the vibration absorbing mechanism 6, while reducing the swing amplitude or circular motion radius of the lagging pendulum weight, thereby improving the movement stability of the suspended weight.

[0031] The present invention implements specific functions through the following steps:

[0032] Step 1: Select the main tower steel truss to be lifted, design the mass block 6a as a lead block with a weight equal to 0.08 times the weight of the main tower steel truss, and then press Figure 6-7 The two sets of the mechanism of the present invention are arranged on the upper end surface of the main tower on the left and right sides, and the cushion beam 1 is fitted and welded to the embedded parts of the main tower, wherein the hanging hanger 5 is also stuck in the two inner grooves of the main tower steel truss on the left and right sides. At this time, the longitudinal jack 1a and the transverse jack 1b are started respectively to push the main longitudinal beam 2 successively to make it fit the lubrication plate for sliding, thereby adjusting it to the initial position with good centering.

[0033] Step 2: In the initial state, the vibration absorbing mechanism 6 is set at the 1 / 3 position from bottom to top of the steel strand 4 in the initial state, and the anchor clip 6b is adjusted with a tool to clamp the steel strand 4, so that the entire vibration absorbing mechanism 6 becomes the initial pendulum of the steel strand 4, and the main tower steel truss lifted by the hoist 5 below becomes a lagging pendulum. At this time, all the through-type jacks 3 are started to store the steel strand 4, and the main tower steel truss is lifted upward to make it close to the docking platform above.

[0034] Step 3: When the main tower steel truss rises and approaches the docking platform on the main tower, the suspension system of the steel strand 4 is forced to produce reciprocating or circular swings due to vibration, wind force or frequent start-stop adjustment operations. Here, the common circular swing is taken as an example. Fig. 9 As shown, the steel strand 4 is equivalent to the cycloid in the series single pendulum system, the through-type jack 3 is equivalent to the suspension point, the vibration absorbing mechanism 6 is equivalent to the initial pendulum, the hanger 5 and the main tower steel truss it carries are equivalent to the lagging pendulum, at this time, the vibration absorbing mechanism 6 and the main tower steel truss each make a circular swing with a constant radius, and its swing trajectory is shown as follows Fig. 9 As shown in the ellipse, by using the Lagrange equation and the stable motion condition, it is determined that the swing amplitude of the hysteresis pendulum is smaller than the state when the vibration absorption mechanism 6 is not added, so that a large number of disturbance factors are absorbed by the mass block 6a and converted into its own circular swing, and the main tower steel truss is restored to a static state by using the hysteresis pendulum motion stability, as shown in FIG. Figure 8 As shown, the main tower docking platform is aligned in this stable state to implement safe and efficient installation and docking work.

[0035] Step 4: When the wind force at the docking site is strong, the anchor clip 6b can be loosened by a tool to tighten the steel strand 4, and the servo motor 6e can be started to make the multiple rubber wheels 6d roll against the outer wall of the steel strand 4, so that the vibration absorbing mechanism 6 moves upward. When it reaches a suitable position, the anchor clip 6b is tightened again with a tool. At this time, the length of the secondary cycloid of the suspended lagging pendulum has been extended, thereby increasing the movement stability of the main tower steel truss, and then the installation and docking operations are carried out in the same way as step 3.

Claims

1. A lifting system for lifting and installing a main tower steel truss, comprising at least two cushion beams, a main longitudinal beam, at least two through-type jacks, at least two steel strands, a sling, and at least two vibration absorbing mechanisms, characterized in that: The two cushion beams are symmetrically arranged at the front and rear end areas of the top surface of the concrete main tower, and the two ends of the main longitudinal beam are fitted and installed on the upper end surfaces of the two cushion beams. A lubrication plate with a lubrication function is respectively provided at the fitting parts of the two ends, so that the main longitudinal beam can fit the lubrication plate to move in the horizontal direction; the two through-type jacks are arranged on the top surface of the main longitudinal beam at a certain interval, and each through-type jack fixes one end of a steel strand, and the other ends of the two steel strands extend downward and pass through the through hole of the main longitudinal beam, and then are suspended with the same hanger. At the same time, each The steel strand is equipped with a vibration absorbing mechanism in the area between the sling and the main longitudinal beam. A mass block is arranged inside the vibration absorbing mechanism, so that the weight hoisted by the sling is combined with the mass block to form a double pendulum series system with the steel strand as the cycloid and the through-type jack as the suspension point, and the weight hoisted by the sling is equivalent to a hysteresis pendulum, so that part of the external force disturbance of the entire suspension mechanism is absorbed by the mass block and converted into the swing or circular motion of the vibration absorbing mechanism, while reducing the swing amplitude or circular motion radius of the hysteresis pendulum weight, thereby improving the movement stability of the suspended weight. The upper end surface of the cushion beam is provided with a plurality of longitudinal movement jacks, A plurality of transverse shifting jacks and a plurality of reaction seats, wherein the fuselages of the plurality of longitudinal shifting jacks and the plurality of transverse shifting jacks are fixed by the reaction seats, the output shafts of the longitudinal shifting jacks are all toward the end face of the main longitudinal beam, the output shafts of the transverse shifting jacks are all toward the side face of the main longitudinal beam, and the plurality of reaction seats are fixed to the upper end face of the cushion beam by welding, and the through-type jack comprises an upper anchor, a main jack, and a lower anchor, wherein the upper anchor, the main jack, and the lower anchor are butt-jointedly installed from top to bottom in a sequential order, and the upper anchor and the lower anchor both have the function of anchoring the wire by prestressing, and the main jack The jack has a lifting function, one end of the steel strand passes through the lower anchor, the main jack, the inner hole of the upper anchor and is fixedly installed through the anchoring function of the upper anchor and the lower anchor. The hoist includes a shoulder pole beam, two ear seat plates, two anchor seats, and two pin shafts, wherein the two side areas of the upper end surface of the shoulder pole beam are respectively fixed with one ear seat plate, and the anchor seat forms an articulated transmission relationship with the ear seat plate through the assembly of the pin shaft. When lifting the main tower steel truss, a lifting system is respectively provided on the two side areas of the top surface of the main tower, and the main tower steel truss is jointly lifted by the two hoists provided by the two lifting systems.

2. A lifting system for lifting and installing a main tower steel truss according to claim 1, characterized in that: The vibration absorbing mechanism includes a mass block, two anchoring clips, four supports, four rubber wheels, and multiple servo motors, wherein a through hole is provided in the middle of the mass block, the aperture of the through hole matches the outer diameter of the steel strand, and the dimensional error between the two is within the range of +4mm~-0.05mm; the anchoring clip has a wire anchoring function, and two anchoring clips are installed at both ends of the mass block, and the two side areas of the anchoring clip facing the outer side are respectively equipped with a support, and each support is equipped with a rubber wheel in an axial hole matching manner, and the body of the servo motor is fixed on the side wall of the support, and the output shaft of the servo motor forms a transmission relationship with the rubber wheel.

3. The lifting system for lifting and installing the main tower steel truss according to claim 1 is characterized in that: The portion of the steel strand between the through-type jack and the vibration absorbing mechanism is equivalent to a primary simple cycloid, and the portion of the steel strand between the vibration absorbing mechanism and the hanger is equivalent to a secondary simple cycloid. The ratio of the primary simple cycloid to the secondary simple cycloid is in the range of 6.5:1 to 1:

1.

4. The lifting system for lifting and installing the main tower steel truss according to claim 1 is characterized in that: The ratio of the weight of the mass block to the weight of the heavy object lifted by the sling should be ≥0.

025.

5. The lifting system for lifting and installing the main tower steel truss according to claim 1 is characterized in that: The material of the mass block is lead, and the material of the lubricating plate contains polytetrafluoroethylene.

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