Steel truss girder tension vertical rod unloading device

Abstract

The utility model provides a steel truss girder tension vertical rod unloading device. The steel truss girder tension vertical rod unloading device comprises an arc cable saddle, a slotting cushion block, a high-strength steel cable, a steel cable end nut, an upper pressure-bearing steel plate, a middle pressure-bearing steel plate, a lower pressure-bearing steel plate, a high-strength pull rod, a lower adjusting nut, an upper adjusting nut, a middle adjusting nut, a jack and the like. A high-strength steel cable of the unloading device is steered through a cable saddle, and reverse tensioning of the steel cable is achieved through a counter-force frame and a jack, so that the purpose of unloading the pulled vertical rod is achieved. The counter-force frame is provided with three pressure-bearing plates, after the stroke of the jack is exhausted, the requirement for large-stroke tensioning can be met by locking the middle adjusting nut, retracting the cylinder of the jack, lowering the upper pressure-bearing plate, locking the upper adjusting nut and stretching the jack out of the cylinder; the steel truss girder tension vertical rod unloading device is used for unloading the steel truss girder tension vertical rod, a lower support does not need to be arranged when the steel truss girder is reinforced in situ, higher reinforcing efficiency can be obtained, and the rod piece can be replaced so as to improve the bearing capacity.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge engineering, in particular to a steel truss girder tension vertical rod unloading device. Background Art

[0002] So far, my country's bridge construction has been developing for quite a long time. During this period, a large number of various types of bridges have been built in the country, and steel trusses are one of them. It is urgent to maintain and reinforce old bridges.

[0003] The existing bridges are the most reasonable passages given by the designers, so each bridge is very precious. Choosing a new site to build a bridge will not only take a long time to build, but also be costly. Demolishing and rebuilding a bridge that has a few decades of remaining life is a bad idea, which is not only expensive, but will also interrupt traffic for a long time. Moving the bridge to a factory for reinforcement cannot avoid the impact of interrupting traffic. However, reinforcing the existing bridges in situ can not only save costs, but also shorten the interruption time as much as possible, and even ensure continuous traffic through reasonable construction procedures.

[0004] In summary, the number of bridges that need to be improved is increasing, and in-situ reinforcement of these bridges to achieve the above purpose at the lowest cost has become the best choice. This patent proposes a reasonable and feasible unloading device for reinforcing or replacing the tension vertical rods of steel trusses. Summary of the invention

[0005] The utility model aims to provide a steel truss girder tension vertical rod unloading device, which can unload the tension vertical rod of the existing bridge in situ, so as to realize the bridge reinforcement at a minimized cost.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a steel truss tension vertical rod unloading device, which is installed on the steel truss and is characterized in that it includes: a pad (22), the pad (22) is respectively installed on the upper and lower chords (16) (17) of the steel truss, the pad (22) is provided with a groove, the cable saddle (21) is provided with a slot matching the pad (22), and is installed in the groove of the pad (22) through the slot, the cable saddle (21) is provided with an arc-shaped cable groove, the steel cable (22) is installed in the arc-shaped cable groove, both ends of the steel cable (22) are provided with threaded alloy ends, the upper side steel cable is penetrated with an upper pressure plate (25) and a middle pressure plate (26), and the lower side steel cable is penetrated with a lower pressure plate (27), The alloy end is screwed with a nut (24) for fixing, and both sides of the upper pressure plate (25), the middle pressure plate (26) and the lower pressure plate (27) are provided with openings, and the openings are used to install a high-strength tie rod (28). The high-strength tie rod (28) has threads for installing an upper adjustment nut (210), an intermediate adjustment nut (211) and a lower adjustment nut (29). The upper adjustment nut (210), the intermediate adjustment nut (211) and the lower adjustment nut (29) are used to adjust the gap between the upper pressure plate (25), the middle pressure plate (26) and the lower pressure plate (27) respectively, and a jack (212) is arranged between the upper pressure plate (25) and the middle pressure plate (26).

[0007] Furthermore, the height between the upper pressure plate (25) and the middle pressure plate (26) is changed by adjusting the middle adjustment nut (211) and the upper adjustment nut (210) on the high-strength pull rod (28), so that the jack (212) can be smoothly inserted, and then the height of the uppermost pressure plate (25) is adjusted by the upper adjustment nut (210) so that it is close to the upper end of the jack (212), and then the uppermost adjustment nut (210) is locked.

[0008] Furthermore, when the tensioned vertical rod of the steel truss is unloaded, the jack (212) moves out of the cylinder to push back, compressing the distance between the upper and lower steel cables, thereby achieving unloading of the tensioned vertical rod.

[0009] The utility model has the following beneficial effects and technical advances:

[0010] The utility model is a complete set of in-situ reinforcement tension vertical rod unloading device for steel truss bridges, including steel cables, reaction frames and jacks. The method is used to reinforce steel trusses without the need for underbridge support, and the tension vertical rods can be unloaded in the original position of the bridge. The patented steel truss tension vertical rod unloading device has the characteristics of strong pertinence, simple structure and easy operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the utility model 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 utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0012] Figure 1 This is a schematic diagram of the installation of the tension vertical rod unloading device for the steel truss beam of the utility model.

[0013] Figure 2 It is a schematic diagram of the utility model of the unloading device of the tensioned vertical rod of the steel truss beam.

[0014] Figure 3 It is a schematic diagram of the exploded view of the unloading device for the tensioned vertical rod of the steel truss beam of the utility model.

[0015] Figure numerals: steel truss compression vertical rod 11, steel truss tension vertical rod 12, steel truss diagonal web members 13, 14, steel truss node plate 15, steel truss upper chord 16, steel truss lower chord 17, unloading device 18; saddle 21, pad 22, steel cable 23, steel cable end nut 24, upper pressure-bearing steel plate 25, middle pressure-bearing steel plate 26, lower pressure-bearing steel plate 27, high-strength pull rod 28, lower adjusting nut 29, upper adjusting nut 210, middle adjusting nut 211, jack 212. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0017] In the following description, reference is made to “some embodiments”, which describes a subset of all possible embodiments, but it can be understood that “some embodiments” can be the same subset or different subsets of all possible embodiments and can be combined with each other without conflict.

[0018] If similar descriptions of "first / second" appear in the application documents, the following explanation is added. In the following description, the terms "first\second\third" involved are used to distinguish similar objects and do not represent a specific ordering of the objects. It can be understood that "first\second\third" can be interchanged in a specific order or sequence where permitted, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0020] Figure 1 This is a schematic diagram of the installation of the unloading device for the tensioned vertical rod of the steel truss beam, which is suitable for unloading when the tensioned vertical rod of the steel truss beam is in situ reinforced or replaced. Figure 1 As shown, the utility model of the unloading device for the tensioned vertical rod of the steel truss beam is installed on the steel truss beam, and the steel truss beam includes a steel truss compression vertical rod 11, a steel truss tension vertical rod 12, a steel truss diagonal web rod 13, 14, a steel truss node plate 15, a steel truss upper chord rod 16, a steel truss lower chord rod 17, and an unloading device 18. When the tensioned vertical rod is unloaded, the unloading device 18 is arranged on both sides of the vertical rod, and the tensioning force is applied synchronously and the space between the steel cables is compressed through the jack, and the tension of the steel cable is used to realize the unloading of the tensioned vertical rod 12. Before the unloading operation, the tensioning force of the jack should be calculated and matched with the tension of the vertical rod. During the tensioning and unloading process, the stress of the vertical rod should be monitored to ensure that the tensioning is in place.

[0021] Figure 2 and Figure 3 The figure is a schematic diagram of the unloading device for the tensioned vertical rod of the steel truss. Figure 2 and Figure 3 As shown, the utility model discloses a new steel truss tension vertical rod unloading device, comprising a cable saddle 21, a cushion block 22, a steel cable 23, a steel cable end nut 24, an upper pressure-bearing steel plate 25, a middle pressure-bearing steel plate 26, a lower pressure-bearing steel plate 27, a high-strength pull rod 28, a lower adjusting nut 29, an upper adjusting nut 210, an intermediate adjusting nut 211, and a jack 212.

[0022] Specifically, during installation, the pad 22 is first installed in the grooves of the upper and lower chord rods. The specific form of the pad can be adjusted according to the specific form of the upper and lower chord rods. The pad is provided with a groove to place the saddle to ensure the stability of the saddle; then the saddle 21 is installed in the groove of the pad 22, and the saddle is provided with a slot matching the pad 22 and an arc-shaped cable groove; the steel cable 23 is installed in the arc-shaped cable groove of the saddle to realize the turning of the steel cable 23 at the chord rod. Both ends of the steel cable 23 are provided with alloy ends, and the alloy ends are provided with threads.

[0023] After the steel cable 23 is adjusted in place, the upper pressure plate 25 and the middle pressure plate 26 are passed through the middle opening on the upper steel cable 23, and then the steel cable end nut 24 is screwed on the end of the upper steel cable 23 to prevent the pressure plate from falling off. Repeat the above-mentioned pressure plate installation steps, install the lower pressure plate 27 on the lower steel cable 23, and tighten the nut 24 at the end of the steel cable; install the high-strength tie rod 28 through the openings on both sides of the pressure plates 25, 26, and 27. The high-strength tie rod 28 is threaded along its entire length. When the high-strength tie rod 28 passes through the middle pressure plate, the middle adjusting nut 211 should be installed at the same time. After the high-strength tie rod 28 passes through all the pressure plates, appropriately adjust the distance between the pressure plates, and then tighten the middle adjusting nut 211 to prevent the high-strength tie rod 28 from falling off. Then adjust the space between the upper pressure plate 25 and the middle pressure plate 26 to allow the jack 212 to be smoothly inserted. After the jack is installed in place, place the upper pressure plate 25 and the jack together. The top of the jack 212 is pressed and the upper adjusting nut 25 is locked, and the lower adjusting nut 29 is installed on the left rear; the jack 212 is simultaneously moved out of the cylinder and starts to tension, opening the gap between the upper pressure plate 25 and the lower pressure plate 26, and compressing the gap between the middle pressure plate 26 and the lower pressure plate 27, so that the steel cable is pulled to remove the internal force of the tensioned vertical rod. If the jack has reached the maximum stroke before the established unloading target is reached, at this time, the middle adjusting nut 212 is no longer under force due to the descent of the middle pressure plate 26, and can continue to be adjusted downward and locked again, and then the jack 212 retracts the bar, and at the same time lowers the upper pressure plate 25 and the upper adjusting nut 210, and then repeats the above tensioning process to continue to unload the vertical rod.

[0024] Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. A person skilled in the art can change, modify, replace and modify the above embodiments within the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A steel truss tension vertical rod unloading device, installed on the steel truss, characterized in that: include: The cushion block (22) is respectively installed on the upper and lower chords (16) (17) of the steel truss beam, the cushion block (22) is provided with a groove, the cable saddle (21) is provided with a slot matching the cushion block (22), and is installed in the groove of the cushion block (22) through the slot, the cable saddle (21) is provided with an arc-shaped cable groove, the steel cable (23) is installed in the arc-shaped cable groove, and the two ends of the steel cable (23) are provided with threaded alloy end heads, the upper side steel cable (23) is penetrated with an upper pressure plate (25) and a middle pressure plate (26), and the lower side steel cable is penetrated with a lower pressure plate (27), and the alloy end heads are screwed with nuts (24) to fix them, and the upper Openings are provided on both sides of the pressure plate (25), the middle pressure plate (26) and the lower pressure plate (27). The openings are used to install high-strength tie rods (28). The high-strength tie rods (28) are threaded and used to install upper adjustment nuts (210), middle adjustment nuts (211) and lower adjustment nuts (29). The upper adjustment nuts (210), middle adjustment nuts (211) and lower adjustment nuts (29) are used to adjust the gaps between the upper pressure plate (25), the middle pressure plate (26) and the lower pressure plate (27) respectively. A jack (212) is provided between the upper pressure plate (25) and the middle pressure plate (26).

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