Steel truss girder pressed vertical rod unloading device

Abstract

The utility model discloses a steel truss girder pressed vertical rod unloading device, which is mounted at the top of a steel truss girder and comprises a support jacking piece, an upper node plate, a lower node plate and a lower node plate, one end of the traction cable is temporarily fixed to the adjacent position of the upper chord and the upper end of the pressed vertical rod on one side, and the other end of the traction cable is temporarily fixed to the adjacent position of the upper chord and the upper end of the pressed vertical rod on the other side after crossing the top of the supporting jacking piece. The unloading device is a whole set of unloading device for the in-situ reinforced pressed vertical rod of the steel truss girder bridge, the steel cable, the reaction frame, the jack and the arc-shaped cable saddle are covered, the unloading device is used for reinforcing the steel truss girder, an under-bridge support is not needed, the unloading of the pressed vertical rod can be realized in situ of the bridge, and the unloading device has the characteristics of strong pertinence, simple structure and easiness in operation.

Description

Technical Field

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

[0002] So far, my country's bridge construction has been developing for a long time. During this period, a large number of bridges of various types have been built in China, and steel trusses are one of them. According to the standard calculation that most bridges are designed to have a service life of 100 years, as of now, some bridges built earlier have been in service for decades and their service life has exceeded half. In order to make the bridge complete its 100-year service life, it is urgent to maintain and reinforce the old bridges. At the same time, the traffic function of some old bridges can no longer meet the existing traffic needs. For this reason, it is necessary to build new bridges or widen and renovate existing bridges to improve their traffic capacity. The existing bridge locations are the most reasonable channels given by designers. Choosing a new location to build a bridge will not only take a long construction period and high cost; demolishing and rebuilding bridges with decades of remaining life will not only be expensive, but will also interrupt traffic for a long time, which will have a great impact on society; moving the bridge to a factory for reinforcement cannot avoid the impact of interrupting traffic. In-situ reinforcement of existing bridges can not only save costs, but also minimize the time of interruption, and even achieve continuous traffic through reasonable construction procedures. Therefore, the best option is to carry out in-situ reinforcement of bridges that need to improve their traffic capacity and achieve the above goals at the lowest cost. Utility Model Content

[0003] In view of this, the purpose of the utility model is to provide a steel truss girder compressed vertical rod unloading device to solve the deficiencies in the prior art.

[0004] In order to achieve the above object, the utility model is implemented by the following technical solutions:

[0005] Provided is a steel truss compression vertical rod unloading device, which is installed on the top of the steel truss, wherein the steel truss comprises an upper chord and a lower chord arranged in parallel with each other, the upper chord is equidistantly provided with an upper node plate, the lower chord is equidistantly provided with a lower node plate, the upper node plates and the lower node plates are arranged in sequence at intervals, a compression vertical rod is arranged between the upper chord and the lower node plate, a tension vertical rod is arranged between the lower chord and the upper node plate, and a diagonal web member is arranged between the mutually adjacent upper node plates and the lower node plates, comprising:

[0006] A supporting jacking member installed on the top of the upper node plate; and

[0007] A pulling rope has one end temporarily fixed to the adjacent portion between the upper chord and the upper end portion of the compression vertical rod on one side, and the other end temporarily fixed to the adjacent portion between the upper chord and the upper end portion of the compression vertical rod on the other side after crossing the top of the supporting jacking member.

[0008] As in the steel truss compressed vertical rod unloading device, the pulling cable is a steel cable forming a closed loop.

[0009] As in the steel truss compressed vertical rod unloading device, the connecting end of the steel cable and the upper chord is provided with an end pad and a steering block, the bottom surface of the upper chord is provided with a chord groove suitable for accommodating and engaging the end pad, the end pad has an end face groove suitable for accommodating and engaging the steering block, and the steering block has an arc-shaped steering groove suitable for accommodating and engaging the steel cable.

[0010] As in the steel truss compressed vertical rod unloading device, the supporting jacking member includes a lower pad, a jack and an upper pad which are sequentially connected from bottom to top.

[0011] For example, in the steel truss compressed vertical rod unloading device, the end of the steel cable that engages with the steering block is an alloy end with an external thread, and the arc-shaped steering groove is provided with an internal thread that is compatible with the external thread.

[0012] For example, in the steel truss compressed vertical rod unloading device, the upper pad is a rectangular block, the four corners of the top surface of the upper pad are respectively provided with arched vertical plates, and the top surface of the arched vertical plates is provided with guide grooves.

[0013] As in the steel truss compressed vertical rod unloading device, the jacks are distributed at the bottom of the two ends of the upper cushion block along the extension direction of the steel cable.

[0014] The beneficial effects of the technical solution of the utility model are:

[0015] The utility model is a complete set of in-situ reinforcement and unloading devices for compressed vertical bars of steel truss bridges, which include steel cables, reaction frames, jacks and arc-shaped cable saddles. The device is used to reinforce steel trusses without the need for under-bridge support, and the compressed vertical bars can be unloaded in the original position of the bridge. The device has the characteristics of strong pertinence, simple structure and easy operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] To further illustrate the above-mentioned purpose, structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings.

[0017] Figure 1 This is a structural schematic diagram of a steel truss compression vertical rod unloading device according to a preferred embodiment of the utility model;

[0018] Figure 2This is an exploded schematic diagram of a steel truss compression vertical rod unloading device according to a preferred embodiment of the utility model;

[0019] Figure 3 This is a schematic diagram of the installation of a steel truss compression vertical rod unloading device in a preferred embodiment of the utility model;

[0020] In the figure: 1, upper chord; 2, lower chord; 3, upper node plate; 4, lower node plate; 5, compression vertical rod; 6, tension vertical rod; 7, diagonal web member; 8, tension cable; 9, end pad; 10, steering block; 11, end face groove; 12, arc-shaped steering groove; 13, alloy end; 14, lower pad; 15, jack; 16, upper pad; 17, arched vertical plate; 18, guide groove; 19, threaded sleeve. DETAILED DESCRIPTION

[0021] The terms "utility model" and "the present utility model" used in this specification are intended to refer broadly to all subject matter of this specification and any patent claims below. Statements containing these terms should not be understood to limit the subject matter described herein or to limit the meaning or scope of any patent claim below. In addition, this specification does not attempt to describe or limit the subject matter covered by any claim of any specific component, paragraph, statement or figure of this application. The subject matter should be understood with reference to the entire specification, all drawings and any claims below. The present utility model may have other embodiments and be practiced or implemented in other ways. Moreover, it should be understood that the wording and terminology used herein are for illustrative purposes and should not be considered as limiting.

[0022] The details of the present invention will now be discussed with reference to the accompanying drawings which illustrate the present invention by way of example only. In the accompanying drawings, similar features or components may be marked with the same reference numerals.

[0023] The use of "including", "having" and "comprising" and variations thereof herein is meant to include the items listed thereafter and their equivalents and additional items. Although reference may be made to directions such as above, below, upward, downward, backward, bottom, top, front, back, etc. in describing the drawings, for convenience, reference is made relative to the drawings. These directions are not intended to literally accept or limit the present invention in any form. In addition, terms such as "first", "second", "third", etc. are used herein for illustrative purposes and are not intended to indicate or imply importance or significance.

[0024] See also Figure 1 , Figure 2 and Figure 3As shown, the utility model of the steel truss compressive vertical rod unloading device is installed on the top of the steel truss, the steel truss includes an upper chord 1 and a lower chord 2 arranged parallel to each other, the upper chord 1 is equidistantly provided with upper node plates 3, the lower chord 2 is equidistantly provided with lower node plates 4, the upper node plates 3 and the lower node plates 4 are arranged at intervals in sequence, a compressive vertical rod 5 is provided between the upper chord 1 and the lower node plate 4, a tensile vertical rod 6 is provided between the lower chord 2 and the upper node plate 3, and a diagonal web 7 is provided between the upper node plate 3 and the lower node plate 4 adjacent to each other.

[0025] See also Figure 1 , Figure 2 As shown, the steel truss girder compression vertical bar unloading device is suitable for unloading when the steel truss girder compression vertical bar is in-situ reinforced or replaced, and specifically includes a support jacking member and a pull rope 8, and the support jacking member is installed on the top of the upper node plate 3. One end of the pull rope 8 is temporarily fixed to the adjacent portion of the upper chord rod 1 and the upper end of the compression vertical bar 5 on one side, and the other end is temporarily fixed to the adjacent portion of the upper chord rod 1 and the upper end of the compression vertical bar 5 on the other side after crossing the top of the support jacking member.

[0026] Specifically, the pulling cable 8 is a steel cable forming a closed loop. Continuing to refer to the figure, the connecting end of the steel cable and the upper chord rod 1 is provided with an end pad 9 and a steering block 10. It can be understood that the bottom surface of the upper chord rod 1 is provided with a chord rod groove suitable for accommodating and engaging the end pad 9. The end pad 9 has an end surface groove 11 suitable for accommodating and engaging the steering block 10, and the steering block 10 has an arc-shaped steering groove 12 suitable for accommodating and engaging the steel cable to ensure the stability of the steering block 10.

[0027] Furthermore, the end of the steel cable that engages with the steering block 10 is an alloy end 13 with an external thread, and the arc-shaped steering groove 12 is provided with an internal thread that is compatible with the external thread.

[0028] See also Figure 1 As shown, the supporting jacking member includes a lower cushion block 14, a jack 15 and an upper cushion block 16 which are sequentially connected from bottom to top.

[0029] Furthermore, the upper pad 16 is a rectangular block, and the four corners of the top surface of the upper pad 16 are respectively provided with arched vertical plates 17, and the top surface of the arched vertical plates 17 is provided with guide grooves 18. The jacks 15 are distributed at the bottom of the two ends of the upper pad 16 along the extension direction of the steel cable, where the force is better.

[0030] During installation, first install the end pad 9 in the chord groove and perform horizontal braking. The specific form of the pad can be adjusted according to the specific form of the chord. Then install the steering block 10 in the end face groove 11 of the end pad 9, and install the steel cable in the arc-shaped steering groove 12 of the steering block 10 to achieve the steering of the steel cable at the chord. Install the lower pad 14 and the jack 15, then install the upper pad 16, connect the steel cable through the threaded sleeve 19, and place the steel cable in the guide groove 18 of the upper pad 16. After the installation is ready, the jack 15 is synchronously removed from the cylinder and starts to reverse tension, and the upper pad 16 is stretched upward to apply tension to the steel cable, so that the steel cable is pulled to remove the internal force of the compressed vertical rod 5. If the jack 15 has reached its maximum stroke before reaching the predetermined unloading target, at this time, the upper pad 16 can be supported by temporary support, and then the jack 15 is retracted, the jack 15 is raised, and then the jack 15 is pulled out of the cylinder again and pushed back, and the above tensioning process is repeated to continue unloading the compressed vertical rod 5.

[0031] Before the unloading operation, the tensioning force of the jack 15 should be calculated and matched with the pressure of the compressed vertical rod 5. During the tensioning and unloading process, the stress of the compressed vertical rod 5 should be monitored to ensure that the tensioning is in place.

[0032] The above are only preferred embodiments of the present invention, and do not limit the implementation mode and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A steel truss compressive vertical rod unloading device is installed on the top of the steel truss, the steel truss comprises an upper chord and a lower chord arranged in parallel with each other, the upper chord is equidistantly provided with an upper node plate, the lower chord is equidistantly provided with a lower node plate, the upper node plates and the lower node plates are arranged in sequence at intervals, a compressive vertical rod is arranged between the upper chord and the lower node plate, a tensile vertical rod is arranged between the lower chord and the upper node plate, and a diagonal web is arranged between the mutually adjacent upper node plates and the lower node plates, characterized in that: include: A supporting jacking member installed on the top of the upper node plate; as well as, A pulling rope has one end temporarily fixed to the adjacent portion between the upper chord and the upper end portion of the compression vertical rod on one side, and the other end temporarily fixed to the adjacent portion between the upper chord and the upper end portion of the compression vertical rod on the other side after crossing the top of the supporting jacking member.

2. The unloading device for the compressed vertical rod of the steel truss beam as claimed in claim 1, characterized in that: The pulling rope is a steel rope forming a closed loop.

3. The unloading device for the compressed vertical rod of the steel truss beam as claimed in claim 2 is characterized in that: The connecting end of the steel cable and the upper chord is provided with an end pad and a steering block. The bottom surface of the upper chord is provided with a chord groove suitable for accommodating and engaging the end pad. The end pad has an end face groove suitable for accommodating and engaging the steering block. The steering block has an arc-shaped steering groove suitable for accommodating and engaging the steel cable.

4. The unloading device for the compressed vertical rod of the steel truss beam as claimed in claim 2, characterized in that: The supporting jacking member comprises a lower cushion block, a jack and an upper cushion block which are sequentially connected from bottom to top.

5. The unloading device for the compressed vertical rod of the steel truss beam as claimed in claim 3 is characterized in that: The end of the steel cable that is engaged with the steering block is an alloy end with an external thread, and the arc-shaped steering groove is provided with an internal thread that is compatible with the external thread.

6. The unloading device for the compressed vertical rod of the steel truss beam as claimed in claim 4, characterized in that: The jacks are distributed at the bottom of two ends of the upper cushion block along the extending direction of the steel cable.

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