An adjustable bridge external reinforcement structure

Abstract

The application discloses an adjustable bridge external reinforcement structure, which comprises a bracket, adjustable cables and arches, the bracket is arranged below an original bridge plate, a plurality of springs are arranged between the bracket and the bottom of the original bridge plate, the arches are arranged on both sides of the original bridge respectively, and a plurality of adjustable cables are connected between the two ends of the bracket and the arches on both sides respectively. The application has the advantages of convenient construction, safety and reliability, strong applicability, adjustable reinforcement performance, convenient later maintenance and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bridge construction, in particular to an adjustable bridge external reinforcement structure. BACKGROUND

[0002] With the development and needs of China's modernization, the road traffic volume has greatly increased, and the load of vehicles is also increasing, which brings new challenges to the bridges designed and built according to the old standard load rating.

[0003] The bridges will be eroded by nature in the years of use, and the changes of temperature and humidity will also affect the bridge structure. In addition, some unexpected situations may also cause quality defects of the bridge, which gradually reduces the bearing capacity of the bridge and cannot meet the needs of modern transportation.

[0004] Therefore, these bridges can be detected and evaluated first, and the structural performance is concluded, and then the reinforcement and reconstruction means are used to restore and improve the working capacity of the bridge. It can reduce investment and also be beneficial to environmental protection.

[0005] In the previous highway bridges, hollow slab beam bridges are used on a large scale, but as the service time increases and the load increases, some bridges have insufficient bearing capacity problems and need to be reinforced.

[0006] In some reinforcement and reconstruction methods, bridge deck reinforcement, increasing the cross section, pasting steel plates, and increasing the inter-plate transverse connection are used to improve the bearing capacity of the bridge. Once the reinforcement is completed, the increase in bearing capacity is fixed, so these methods have certain limitations. Therefore, the reinforcement method of the bridge can be innovated, which can be widely used while meeting the construction convenience and green environmental protection. In addition, if the reinforcement capacity can be adjusted, the application range can be expanded. SUMMARY

[0007] The technical problem to be solved by the present application is to provide an adjustable bridge external reinforcement structure, which has the advantages of convenient construction, safety and reliability, strong applicability, adjustable reinforcement performance, and convenient maintenance.

[0008] The technical scheme adopted by the present application to solve the above technical problems is:

[0009] An adjustable bridge external reinforcement structure, comprising a bracket, an adjustable cable and an arch, the bracket is arranged below the original bridge plate, a plurality of springs are arranged between the bracket and the bottom of the original bridge plate, the arches are arranged on both sides of the original bridge plate, and a plurality of adjustable cables are connected between the two ends of the bracket and the two arches.

[0010] According to the above technical solution, both ends of the arch frame are connected to arch feet, which are fixed to the lower structure of the original bridge deck above the pier.

[0011] According to the above technical solution, the arch foot is connected to the substructure of the original bridge deck by rebar installation, bearing the load of the external reinforcement system and part of the original bridge load.

[0012] According to the above technical solution, the original bridge deck substructure was a bridge crossbeam arranged above the bridge pier.

[0013] According to the above technical solution, a tension steel bundle is connected between the two arch feet, and the tension steel bundle passes through the end opening of the bracket; the tension steel bundle 6 is limited and fixed.

[0014] According to the above technical solution, the tensioning steel strand is an adjustable structure, which can adjust the tension of the tensioning steel strand.

[0015] According to the above technical solution, the bottom of the original bridge deck is provided with a steel plate, and the upper end of the spring is connected to the original bridge deck through the steel plate.

[0016] According to the above technical solution, the bracket includes multiple steel pipes arranged in a crisscross pattern.

[0017] According to the above technical solution, the position and number of adjustable cables are determined by design calculation. Preferably, the adjustable cables are set at 1 / 4, 1 / 2, and 3 / 4 of the length of the arch frame, and the number of adjustable cables connected to each arch frame is not less than 3.

[0018] According to the above technical solution, the adjustable cable includes a lower cable, an upper cable, and a cable adjusting sleeve. The lower end of the lower cable is connected to the bracket, the upper end of the lower cable is connected to the lower end of the upper cable through the cable adjusting sleeve, and the upper end of the upper cable is connected to the arch frame.

[0019] The cable adjusting sleeve includes an upper sleeve and a lower sleeve. The upper sleeve is connected to the upper cable, and the lower sleeve is connected to the lower cable. The upper sleeve is threaded into the lower sleeve, and a locking screw is provided between the upper sleeve and the lower sleeve. The cable adjusting sleeve 10 changes the tension of the cable, so that the spring is in a compressed state, thereby changing the vertical force of the bracket on the original bridge.

[0020] According to the above technical solution, the lower end of the adjustable cable and the bracket are respectively fixed with a lug plate and a fork lug, and the lug plate is hinged to the fork lug by a pin; the adjustable cable is connected to the fork lug 11 by welding the lug plate, and the other end of the adjustable cable is fixed to the arch frame 5.

[0021] The present invention has the following beneficial effects:

[0022] This invention changes the tension of the cable by adjusting the cable sleeve, thus compressing the spring and altering the vertical force exerted by the bracket on the original bridge. Compared to other reinforcement methods that require structural strengthening, this invention offers advantages such as convenient construction, safety and reliability, strong applicability, adjustable reinforcement performance, and convenient maintenance. Attached Figure Description

[0023] Fig. 1 This is a schematic diagram of the adjustable external reinforcement structure for bridges in an embodiment of the present invention;

[0024] Fig. 2 This is a schematic diagram of the connection between the bracket and the bottom of the original bridge plate via a spring in an embodiment of the present invention;

[0025] Fig. 3 This is a schematic diagram of the adjustable cable structure in an embodiment of the present invention;

[0026] In the diagram, 1-original bridge deck, 2-substructure of original bridge deck, 3-bracket, 4-adjustable cable, 5-arch frame, 6-tensioned steel strand, 7-arch foot, 8-attached steel plate, 9-spring, 10-cable adjusting sleeve, 11-ear plate and fork lug. Detailed Implementation

[0027] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] Reference Figs. 1-3 As shown, an adjustable bridge external reinforcement structure in one embodiment of the present invention includes a bracket 3, adjustable cables 4, and an arch frame 5. The bracket 3 is located below the original bridge deck 1, and multiple springs 9 are arranged between the bracket 3 and the bottom of the original bridge deck 1. The arch frames 5 are respectively located on both sides of the original bridge deck 1, and multiple adjustable cables 4 are connected between the two ends of the bracket 3 and the arch frames 5 on both sides. By changing the tension of the cables through the cable adjustment sleeve 10, the springs 9 are in a compressed state, thereby changing the vertical force of the bracket 3 on the original bridge.

[0029] Furthermore, both ends of the arch frame 5 are connected to arch feet 7, which are fixed to the lower structure 2 of the original bridge deck above the pier.

[0030] Furthermore, the arch foot 7 is connected to the original bridge deck substructure 2 by rebar installation, bearing the load of the external reinforcement system and part of the original bridge load.

[0031] Furthermore, the original bridge deck substructure 2 is a bridge crossbeam arranged above the bridge pier.

[0032] Furthermore, a tension steel bundle 6 is connected between the two arch feet 7, and the tension steel bundle 6 passes through the end opening of the bracket 3; the tension steel bundle 6 is limited and fixed.

[0033] Furthermore, the tensioning steel strand 6 is an adjustable structure, which can adjust the tension of the tensioning steel strand 6; the adjustable tensioning steel strand includes anchor head, cable body, adjusting sleeve, etc., which can be purchased according to specifications, and the tension can be adjusted through the adjusting sleeve.

[0034] Furthermore, a steel plate 8 is attached to the bottom of the original bridge deck, and the upper end of the spring 9 is connected to the original bridge deck through the steel plate 8.

[0035] Furthermore, bracket 3 includes multiple steel pipes arranged in a crisscross pattern.

[0036] Furthermore, the position and number of adjustable cables 4 are determined by design calculations. Preferably, the adjustable cables 4 are set at 1 / 4, 1 / 2, and 3 / 4 of the length of the arch frame 5, and the number of adjustable cables 4 connected to each arch frame 5 is not less than 3.

[0037] Furthermore, the adjustable cable 4 includes a lower cable, an upper cable, and a cable adjusting sleeve 10. The lower end of the lower cable is connected to the bracket 3, the upper end of the lower cable is connected to the lower end of the upper cable through the cable adjusting sleeve 10, and the upper end of the upper cable is connected to the arch frame 5.

[0038] The cable adjusting sleeve 10 includes an upper sleeve and a lower sleeve. The upper sleeve is connected to the upper cable, and the lower sleeve is connected to the lower cable. The upper sleeve is threaded into the lower sleeve, and a locking screw is provided between the upper sleeve and the lower sleeve. By adjusting the cable adjusting sleeve 10, the tension of the cable is changed, so that the spring 9 is in a compressed state, thereby changing the vertical force of the bracket 3 on the original bridge.

[0039] Furthermore, the lower end of the adjustable cable 4 and the bracket 3 are respectively fixed with a lug plate and a fork lug 11, and the lug plate is hinged to the fork lug by a pin; the adjustable cable 4 is connected to the lug plate and the fork lug 11 by welding, and the other end of the adjustable cable 4 is fixed to the arch frame 5.

[0040] The working principle of this invention is as follows: An adjustable external reinforcement measure for bridges includes a bracket 3, an arch frame 5, and an arch foot 7. The bracket 3 is connected to the bottom of the old bridge via springs 9. Adjustable cables 4 are connected to both ends of the bracket 3, and the other end of the adjustable cables 4 is fixed to the arch frame 5. Both ends of the arch frame 5 are fixed to the arch foot 7, and the arch foot 7 is connected to the substructure of the old bridge via rebar. In addition, tension steel strands 6 are threaded through both ends of the arch foot 7. The steel strands pass through the bracket 3, which limits and fixes the bracket 3 and reduces the horizontal force on the arch foot 7.

[0041] Specifically, after grinding and cleaning the bottom of the old bridge, steel plates 8 are pasted on, and springs 9 are installed on the steel plates. The other end of the springs 9 is connected to brackets 3. The stiffness of the springs 9 is determined by calculation according to the reinforcement requirements. Brackets 3 can be made of steel pipes, and a pre-camber is set according to calculations. Due to gravity and load, the brackets at the bottom of the beam will deflect to a certain extent. Setting a pre-camber in advance can improve the stress on the structure. The calculation method is to use structural design software to calculate the pressure transmitted by the springs and the deflection caused by the gravity on the brackets, and then set the pre-camber according to the relevant professional specifications.

[0042] Specifically, adjustable cables 4 are installed at both ends of the bracket 3, and the other end of the adjustable cables 4 is fixed to the arch frame 5; the tension of the cables is changed by adjusting the cable sleeve 10, so that the spring 9 is in a compressed state, thereby changing the vertical force of the bracket 3 on the original bridge.

[0043] Specifically, the arch frame 5 is installed on the arch foot 7 through prefabrication or on-site segmented welding. The shape, rise-to-span ratio, and cross-sectional shape of the arch frame are determined based on calculations and actual needs. The shape of the arch frame can be determined by landscape requirements, which will affect the rise-to-span ratio and the cross-sectional shape of the arch frame. At the same time, the need for bridge reinforcement will affect the load borne by the bracket, and thus affect the load on the arch frame. The shape, rise-to-span ratio, and cross-sectional shape of the arch frame are determined based on the arch frame load, and the calculation method is also realized through structural calculation software.

[0044] Preferably, the arch foot 7 is cast and installed by extending the original bridge substructure, such as by installing rebar and then casting the extended section in place. If the original bridge substructure does not have the conditions for extension, the arch foot 7 can be installed by constructing a new arch frame 5 substructure.

[0045] Specifically, the two ends of the arch foot 7 are connected by steel strands, which reduce the horizontal force on the arch foot 7. Preferably, in locations with a large span, adjustable steel strands can be selected to adjust the tension of the steel strands.

[0046] Specifically, the steel strand passes through the bracket 3 to fix and limit the bracket 3.

[0047] An adjustable external reinforcement method for bridges includes a bracket, adjustable cables, an arch frame, tension steel strands, and arch feet. The base of the existing bridge is connected to the bracket via springs. Adjustable cables are connected to both ends of the bracket. The tension of the cables is changed by adjusting sleeves, compressing the springs and altering the vertical force exerted by the bracket on the original bridge. The other end of the adjustable cable is fixed to the arch frame, and both ends of the arch frame are fixed to the arch feet. The arch feet are connected to the substructure of the existing bridge via reinforcing bars. Tension steel strands are threaded through both ends of the arch feet, passing through the bracket to limit and fix the bracket. This invention transfers the load from the upper part of the original bridge to the arch frame, utilizing the stress characteristics of the arch to transmit the load to the substructure.

[0048] The above are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, any equivalent changes made in accordance with the claims of the present invention shall still fall within the protection scope of the present invention.

Claims

1. An adjustable external reinforcement structure for bridges, characterized in that, It includes a bracket, adjustable cables, and arches. The bracket is located below the original bridge deck, and multiple springs are arranged between the bracket and the bottom of the original bridge deck. The arches are located on both sides of the original bridge deck, and multiple adjustable cables are connected between the two ends of the bracket and the arches on both sides. Both ends of the arch frame are connected to arch feet, which are fixed to the lower structure of the original bridge deck above the pier. A tension steel strand is connected between the two arch legs, and the tension steel strand passes through the end opening of the bracket; The bottom of the original bridge deck is fitted with a steel plate, and the upper end of the spring is connected to the original bridge deck through the steel plate. The bracket consists of multiple steel pipes arranged in a crisscross pattern; Adjustable cables are set at 1 / 4, 1 / 2, and 3 / 4 of the arch length, and each arch is connected to no less than 3 adjustable cables; The adjustable cable includes a lower cable, an upper cable, and a cable adjusting sleeve. The lower end of the lower cable is connected to the bracket, the upper end of the lower cable is connected to the lower end of the upper cable through the cable adjusting sleeve, and the upper end of the upper cable is connected to the arch frame. The cable adjusting sleeve includes an upper sleeve and a lower sleeve. The upper sleeve is connected to the upper cable, and the lower sleeve is connected to the lower cable. The upper sleeve is threaded into the lower sleeve, and a locking screw is provided between the upper sleeve and the lower sleeve.

2. The adjustable external bridge reinforcement structure according to claim 1, characterized in that, The arch foot is connected to the substructure of the original bridge deck by installing reinforcing bars.

3. The adjustable external bridge reinforcement structure according to claim 1, characterized in that, The tensioning steel strand has an adjustable structure, which allows for adjustment of the tension of the tensioning steel strand.

4. The adjustable external bridge reinforcement structure according to claim 1, characterized in that, The lower end of the adjustable cable and the bracket are respectively fixed with a lug and a fork, and the lug and the fork are hinged together.

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