Connecting mechanism of expansion device of highway bridge

Abstract

The present invention relates to the structure and construction of a highway bridge expansion device, and in particular to a connecting mechanism of a highway bridge expansion device. It includes embedded parts that are embedded at intervals in the concrete structure at the bottom of a reserved groove opened at the beam end or the bridge head, and assembled with the anchor bars of the expansion device through overlapping bars; the embedded parts are embedded as a whole in the concrete structure at the bottom of the reserved groove, the top of the embedded parts is not higher than the bottom surface of the inner cavity of the reserved groove, the top of the embedded parts includes an assembly part that can be fixedly assembled with the anchor bars and / or a connecting plate that can be fixedly assembled with the anchor bars, the overlapping bars are rectangular, and the overlapping parts of the overlapping bars and the anchor bars of the expansion device are penetrated by horizontal steel bars. The present invention effectively solves the problems of long construction period and great construction difficulty of highway bridge expansion devices in the prior art, and has the advantages of low construction difficulty and strength, fast construction speed, and convenience for standardized production.

Description

Technical Field

[0001] The invention relates to the structure and construction of a highway bridge expansion device, in particular to a connecting mechanism of a highway bridge expansion device. Background Art

[0002] The expansion joint is an indispensable part of the bridge structure, no matter on any size of bridge. In the bridge structure, it must adapt to the changes in the joints caused by factors such as the temperature change of the beam, the shrinkage caused by the creep and shrinkage of the concrete, the rotation of the beam end, the deflection of the beam, etc., and directly bear the repeated load of the wheels. It is the weakest link in the bridge structure. The installation quality of the expansion joint of the highway bridge is of great significance to ensure the performance of the bridge, improve the driving comfort, and ensure the service quality of the highway bridge. According to the requirements of the "Expansion Joint of Highway Bridge" (JT / T 327-2016), the expansion joint is a gap set in the superstructure to meet the needs of the deformation of the bridge structure. The expansion joint of the highway bridge is a general term for various devices composed of rubber and steel components set at the expansion joint to allow vehicles to pass smoothly through the bridge deck and meet the needs of the deformation of the superstructure of the bridge. The above-mentioned industry standards provide detailed descriptions of the classification, processing, technical performance, transportation and storage of the expansion joint of highway bridges. A large number of existing documents have put forward clear requirements for the installation and construction of expansion joints. The installation of the existing highway bridge expansion device is generally carried out in the following steps: the first is bridge deck paving: fillers or stuffing are placed in the expansion joint and the reserved groove, and then the bridge deck is paved on the surface of the filler, beam or bridge head to form a pavement layer; the second is slotting: measure and mark the edge of the reserved groove according to the requirements, cut the pavement layer in the reserved groove with an asphalt concrete seam cutter, remove the filler and pavement layer in the cut, roughen the concrete surface of the side wall and bottom of the reserved groove, and clean up the debris; the third is positioning and welding: place the expansion device in the groove and put it through the horizontal Install the connecting reinforcement towards the set, adjust the elevation and straightness of the expansion device to meet the requirements, and then weld the anchor reinforcement of the expansion device to the pre-buried anchor steel bars; the fourth is to install the formwork and pour: clean the reserved groove and fill the expansion joint with foam plastic, install formwork on both sides of the expansion joint to prevent concrete from entering the expansion joint during pouring and vibration, pour the concrete into the reserved grooves on both sides of the formwork and then vibrate and smooth it; the fifth is to install sealing strips and maintain: clean the relevant parts and install sealing strips, and open traffic after the concrete is cured until its strength meets the requirements.

[0003] The above-mentioned existing installation method has the following problems: First, according to the construction requirements, the embedded bars must not have cracks, breaks or missing. The cracked and broken steel bars should be promptly repaired or rebars should be planted according to the welding requirements, and the bent embedded bars should be straightened. Since the lower part of the existing embedded bars is fixed in the concrete structure at the bottom of the reserved groove, and the upper part forms a raised door-shaped structure in the reserved groove, in practice, the upper protruding embedded bars are often bent or broken due to careless operation or processing errors, which delays the construction time and increases the construction cost. Second, debris is easily accumulated between the upper protruding embedded bars and the reserved groove (especially asphalt and other debris on the surface are difficult to remove). When cleaning the debris in the reserved groove before installing the telescopic device, it is usually necessary to use a special tool with a sharp front end to dig slowly, which makes construction difficult. The strength and hardness are high, the debris is not easy to clean up, and the construction period is long; thirdly, if the upper part of the embedded reinforcement is too high, it needs to be cut off, which causes unnecessary trouble to the construction; fourthly, when multiple beams are spliced, due to errors in the prefabrication and hoisting of the beams, the widths of the reserved grooves and expansion joints are different. In addition, due to the influence of the protruding embedded reinforcement, the expansion joints cannot be simply covered with cover plates and then covered with filling materials during the bridge deck paving. The construction is cumbersome, labor-intensive and time-consuming to clean the debris in the embedded grooves before installing the expansion device.

[0004] The applicant has not found any patent literature report identical or similar to the present invention in the domestic patent database. Currently, research on telescopic devices mainly focuses on structural improvements to the telescopic devices themselves.

[0005] The above-mentioned prior art shows that it is imperative to improve the connection mechanism and construction process of the existing highway bridge expansion device to improve the construction speed and construction quality. Summary of the invention

[0006] The purpose of the present invention is to provide a connecting mechanism for a highway bridge expansion device, which can effectively speed up the installation construction progress of the highway bridge expansion device and improve the construction quality.

[0007] The overall technical concept of the present invention is:

[0008] The connecting mechanism of the expansion device of a highway bridge comprises an embedded part which is embedded at intervals in the concrete structure at the bottom of a reserved groove opened at a beam end or a bridge head and assembled with the anchor bars of the expansion device through lap bars; the embedded part is embedded as a whole in the concrete structure at the bottom of the reserved groove, the top of the embedded part is not higher than the bottom surface of the inner cavity of the reserved groove, the top of the embedded part comprises an assembly part which can be fixedly assembled with the anchor bars and / or a connecting plate which can be fixedly assembled with the anchor bars, the lap bars are rectangular, and the lap joint between the lap bars and the anchor bars of the expansion device is penetrated by horizontal steel bars.

[0009] The specific technical concept of the present invention also includes:

[0010] In order to realize the standardized assembly of the embedded parts and improve their anchoring strength, the preferred technical solution is that the side or bottom of the embedded parts is connected to the fixing frame or the internal steel bars of the concrete provided in the concrete structure at the bottom of the reserved groove.

[0011] The fixation of the embedded parts to the fixing frame or the internal steel bars of the concrete can be achieved by a variety of existing fixing methods, all of which do not deviate from the technical essence of the present invention, including but not limited to the following technical means, wherein the side or bottom of the embedded parts and the fixing frame or the internal steel bars of the concrete structure at the bottom of the reserved groove are connected by welding, binding, quick-connect fastening, screw connection, bolt connection or one of the combinations thereof.

[0012] In order to increase the assembly reliability of the connecting plate and adjacent components, the preferred technical implementation means is that the connecting plate is a strip-shaped sheet structure.

[0013] The fixing of anchor bars, lap bars and connecting plates can be achieved by various technical means, including but not limited to the following methods: the anchor bars are fixed to the connecting plates or assembly parts through the lap bars by welding, screws, bolts, integrated molding or a combination thereof.

[0014] In order to facilitate processing and reliable connection of parts, and to meet the uniform force of the highway bridge expansion device and the concrete structure, the preferred technical implementation means is that the embedded parts are arranged in parallel at intervals in the concrete structure at the bottom of the reserved groove opened at the beam end or bridge head. The applicant needs to explain that the embedded parts are embedded in parallel at intervals in the concrete structure at the bottom of the reserved groove opened at the beam end or bridge head means that the angle between the embedded parts and the horizontal direction is α, 0°≤α≤180°.

[0015] Under the premise of meeting the actual needs, in order to adapt to the error requirements in the production, processing and assembly links, the preferred technical implementation means is that the distance between the top of the embedded part and the bottom surface of the reserved groove cavity is D, 0≤D≤10mm. Even if the top of the embedded part is lower than the bottom surface of the reserved groove cavity, it can be easily found through human observation, and the floating dust on the top of the embedded part can be knocked away by a general tool (such as a hammer) to expose the assembly part. On the contrary, if the top of the embedded part is slightly higher than the bottom surface of the reserved groove cavity due to insertion, fixation, cement curing, etc., the installation of the telescopic device will not be affected by the exposure of individual embedded parts; the adjustment of the above technical structure does not deviate from the protection scope of the present invention.

[0016] A more preferred technical implementation method is that 0≤D≤5mm.

[0017] The applicant needs to state:

[0018] In the description of the present invention, the orientations or positional relationships indicated by terms such as “top”, “bottom”, “side”, “bottom surface”, “lateral”, “strip”, “sheet”, “side wall”, “both sides”, etc. are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of simplifying the description of the present invention. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0019] As far as the applicant knows, the relevant indicators and methods for verifying the technical effect of the present invention are not recorded in the existing national standards and industry standards. In order to verify the technical effect of the present invention, the applicant conducted the following tests:

[0020] 1. Test items: Physical construction test of special embedded parts for expansion joints.

[0021] 2. Test date: August 12, 2019.

[0022] 3. Test location: Ningbo Xiangshan, Xinqiao connection test section.

[0023] 4. Participants: Ge Yonggang, Gu Qiangang, Zhang Bo, Jiang Pengfei, Wei Chunjing, Zhao Jie, Gao Jianhua, Guo Le and Hu Hui.

[0024] 5. Test purpose: To collect statistics and calculate the construction method, construction time and cost of special embedded parts. Under the premise of the same construction quality, compare with the existing product structure and construction method.

[0025] 6. Test steps

[0026] 1. Precast beam body reserved groove. When the concrete of the beam to be cast is not solidified, the embedded part of the present invention is inserted, and the top of the embedded part is flush with the bottom surface of the inner cavity of the reserved groove, with a parallel spacing of 250mm, which is consistent with the spacing of the anchor bars of the telescopic device;

[0027] 2. Use a long wooden board to cover the expansion joint at the bottom of the reserved groove to prevent debris from entering; then fill the reserved groove with sandbags, and when the backfill height is consistent with the bridge deck concrete height, proceed with bridge deck paving;

[0028] 3. Determine the location of the expansion joint, accurately mark the line according to the size on the drawing, use a cutting machine to accurately saw the bridge deck pavement according to the marked line, and clean it with water in time;

[0029] 4. Remove the sandbags and the debris that fell in the gaps between the sandbags. The small amount of concrete attached to the surface of the embedded parts can be knocked off. Check whether the embedded parts are complete and whether they correspond to the anchor bars of the telescopic device. Roughen the side walls and bottom of the reserved groove and clean them;

[0030] 5. Check the gap size of the telescopic device steel, adjust the positioning value during installation, and fix it with a special fixture;

[0031] 6. Install the hanger and hoist the telescopic device into the groove pit, adjust the center line of the telescopic device to coincide with the center line of the expansion joint, match the anchor bars of the telescopic device with the embedded parts one by one, adjust the elevation of the telescopic device, and make the top surface elevation consistent with the design requirements; connect the anchor bars and embedded parts of the telescopic device with lap bars, then put in horizontal steel bars, loosen the clamps, and allow it to expand and contract freely;

[0032] 7. Use foam strips to seal the top seam of the expansion device, install the beam end formwork, pour C50 premixed concrete in the reserved groove, and fill and compact it;

[0033] 8. Cover the ground with film and sprinkle water. When the concrete reaches more than 80% of the design strength, clean the cavity and install waterproof rubber strips. Traffic can be opened only when the concrete strength reaches the design requirements.

[0034] VII. Test Conclusion

[0035] 1. Since the reserved groove is flat and has no steel mesh, it can be filled with sandbags or large pieces of fillers. Compared with the previous use of bulk sand, construction waste and other granular bulk fillers, it is more convenient to clean, and there is no dust floating, which enhances environmental protection;

[0036] 2. Since the reserved groove is flat and has no protruding embedded reinforcement, it can be cleaned as a whole with a general large tool, saving the time of using small tools to clean the debris in the embedded reinforcement when cleaning the groove, making the cleaning work simpler and faster;

[0037] 3. Since there are no protruding embedded bars in the reserved groove, it is unnecessary to straighten the bent embedded bars, adjust the spacing between the embedded bars, and plant the bars. The strip steel plate on the top of the embedded part increases the connection size of the embedded part. When there is a deviation between the anchor bar of the telescopic device and the embedded part, the contact area is increased, which facilitates the positioning of the telescopic device.

[0038] 4. The strip steel plate on the top of the embedded part increases the anchoring area and improves the connection reliability with the anchoring bars of the telescopic device;

[0039] In summary, after calculation and statistics by the applicant, under the premise of equal construction quality, the structure and process of the present invention can effectively save construction time by 3 times compared with existing products and construction methods, and no special tools are required during construction, which greatly improves work efficiency and is more environmentally friendly.

[0040] The substantial features and significant technical advances of the present invention are:

[0041] 1. The present invention adopts a structural design in which the top of the embedded part is not higher than the bottom surface of the inner cavity of the reserved groove. Since the bottom surface of the inner cavity of the reserved groove has a high flatness, conventional tools can be used to clean the inner cavity, thereby ensuring the cleaning effect of the inner cavity of the reserved groove and greatly improving the construction progress.

[0042] 2. Since the bottom surface of the reserved groove has good flatness, when constructing the bridge deck pavement layer, the expansion joint surface can be covered with a cover plate to prevent debris from entering. Compared with the existing construction method of assembling expansion joints of multiple beams, the paving construction progress is greatly accelerated; secondly, the difficulty of cleaning debris in the expansion joint before the construction of the expansion device is reduced, and the cleaning speed is accelerated; thirdly, it can avoid the damage to the workpiece caused by bending or breaking of the upper part of the anchor and the resulting straightening or reinforcement process of the anchor, simplifying the construction process and reducing the failure rate; fourthly, since the reserved groove is flat and there is no gate-type structure reserved steel bar, it can be filled with sandbags or large pieces of fillers, which is more convenient to clean than the previous use of bulk sand, construction waste and other granular bulk fillers, and there is no dust floating, which enhances environmental protection.

[0043] 3. The structural design adopts an assembly part with an adaptable connection with the anchor bar of the expansion device on the top of the embedded part. While ensuring the effective connection with the connecting plate and the anchor bar of the expansion device, the conventional method of inserting the embedded part when the concrete of the fixed frame or the beam to be cast is not solidified can be conveniently adopted to achieve rapid construction. Even if a small amount of concrete adheres to the surface of the embedded part, it can be easily removed by common mechanical methods such as knocking with hard objects. The construction difficulty is small and standardized production is easy to achieve.

[0044] 4. The structural design of a connecting plate fixed on the top of the embedded part increases the surface area of ​​the embedded part, further improves the connection reliability with the anchor bar of the telescopic device, and facilitates the adjustment of the connection position between the anchor bar and the embedded part.

[0045] 5. Since the embedded parts are embedded in the concrete structure of the reserved groove as a whole, the bottom surface of the reserved groove has a high flatness, making it easier to adjust the straightness during the installation and construction of the telescopic device.

[0046] 6. According to the applicant's test, the structure and construction method of the present invention can effectively save 3 times of construction time and do not require special tools, greatly improving work efficiency, compared with the existing product structure and construction method, under the premise of the same construction quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a structural schematic diagram of the highway bridge expansion device in the present invention when the connecting mechanism is installed and concrete is not poured.

[0048] Figure 2 It is a structural diagram of the completed pavement layer but without the expansion device installed.

[0049] Figure 3 It is a schematic diagram of the expansion joint structure with exposed embedded parts after existing multiple beams are cast in situ and spliced.

[0050] Figure 4 yes Figure 3 AA view in .

[0051] Figures 5 to 7 It is a schematic diagram of the distribution of embedded parts of different structures in the reserved groove concrete structure.

[0052] Figure 8 , Fig.10 It is a structural schematic diagram of embedded parts and connecting plates of different structures.

[0053] Fig. 9 yes Figure 8 Top view of the .

[0054] Fig.11 yes Fig.10 Top view of the .

[0055] Fig.12 It is a structural schematic diagram of the orthogonal installation of embedded parts and telescopic devices.

[0056] Fig.13 It is a structural schematic diagram of the oblique installation of embedded parts and telescopic devices.

[0057] The reference numerals in the accompanying drawings are as follows:

[0058] 1. Fixed frame or internal steel bars of concrete; 2. Pavement layer; 3. Horizontal steel bars; 4. Anchor bars of telescopic device; 5. Reserved grooves; 6. Connecting plates; 7. Embedded parts; 8. Cover plates; 9. Fillers; 10. Overlap bars. DETAILED DESCRIPTION

[0059] The present invention is further described below in conjunction with embodiments, but it should not be construed as limiting the present invention. The protection scope of the present invention shall be based on the contents recorded in the claims, and any replacement of equivalent technical means made according to the description shall not depart from the protection scope of the present invention.

[0060] The overall structure of this embodiment is shown in the figure. The connecting mechanism of the highway bridge expansion device includes embedded parts 7 that are embedded at intervals in the bottom concrete structure of the reserved groove 5 opened at the beam end or the bridge head and assembled with the anchor bar 4 of the expansion device through the lap bar 10; the embedded parts 7 are embedded as a whole in the bottom concrete structure of the reserved groove 5, and the top of the embedded parts 7 is not higher than the bottom surface of the inner cavity of the reserved groove 5. The top of the embedded parts 7 includes an assembly part that can be fixedly assembled with the anchor bar 4 and / or a connecting plate 6 that can be fixedly assembled with the anchor bar 4. The lap bar 10 is rectangular, and the lap part between the lap bar 10 and the anchor bar 4 of the expansion device is penetrated by the horizontal steel bar 3.

[0061] The side or bottom of the embedded part 7 is welded to the fixing frame or the internal steel bar 1 of the concrete structure at the bottom of the reserved groove 5; Figure 1 shown.

[0062] The connecting plate 6 is a strip-shaped sheet structure; Figure 8-11 shown.

[0063] The anchoring bar 4 is fixed to the connecting plate 6 or the assembly part through the lap bar 10 by welding, screws, bolts, integrated molding or a combination thereof; Figure 5-11 shown.

[0064] The embedded parts 7 are arranged in parallel at intervals in the bottom concrete structure of the reserved groove 5 opened at the beam end or bridge head; Fig.12 , 13 shown.

[0065] The distance between the top of the embedded part 7 and the bottom surface of the inner cavity of the reserved groove 5 is D, 0≤D≤10mm.

[0066] The application of the connection mechanism of the expansion joint device in the installation and construction of the expansion joint device includes the following steps:

[0067] A. Bridge deck paving

[0068] The cover plate 8 is placed at the bottom of the reserved groove 5 on both sides of the expansion joint to prevent debris from entering, and fillers 9 are placed in the reserved groove 5 on the surface of the cover plate 8, and then the bridge deck is paved on the surface of the filler 9, the beam or the bridge head to form a paving layer 2; Figure 2 As shown;

[0069] B. Slitting and Grooving

[0070] Measure and mark the edge of the reserved groove according to the requirements, cut the pavement layer 2 in the reserved groove 5 with an asphalt concrete seam cutter, remove the filler 9 and pavement layer 2 in the cut, roughen the side wall and bottom surface of the reserved groove 5 and clean up the debris; Figure 1 As shown;

[0071] C. Positioning and welding

[0072] Check the gap size of the steel section of the telescopic device, adjust the positioning value during installation, and fix it with a special fixture; place the telescopic device in the slot, match the anchor bar 4 of the telescopic device with the position of the embedded part 7, adjust the elevation and straightness of the telescopic device to meet the requirements, and then weld the anchor bar 4 of the telescopic device and the embedded part 7 with the lap bar 10, then put the horizontal steel bar 3 in the lap joint of the lap bar 10 and the anchor bar 4 of the telescopic device, and loosen the fixture to allow it to freely expand and contract; Figure 1 As shown;

[0073] D. Install formwork and pour

[0074] Clean the reserved groove 5 and fill it with foam plastics. Install templates on both sides of the expansion joint to prevent concrete from entering the expansion joint during pouring and vibration. Pour the premixed concrete into the reserved grooves 5 on both sides of the template and vibrate and smooth it.

[0075] E. Installation and maintenance of sealing strips

[0076] Clean the relevant parts and install sealing strips, and open to traffic after the concrete has been cured until its strength reaches the required level.

[0077] For telescopic devices with a longer length, they are manufactured in a segmented processing manner, and the assembly method also includes a step C1, which is located after the step C or is performed simultaneously with the elevation and straightness adjustment of the telescopic device in step C. Step C1 is to connect the segmented telescopic devices end to end and splice them into a whole.

Claims

1. A connecting mechanism for a highway bridge expansion device, comprising an embedded part (7) which is embedded at intervals in a concrete structure at the bottom of a reserved groove (5) provided at a beam end or a bridge head and assembled with an anchoring bar (4) of the expansion device via a lap bar (10); characterized in that The embedded part (7) is embedded in the concrete structure at the bottom of the reserved groove (5) as a whole. The top of the embedded part (7) is not higher than the bottom surface of the inner cavity of the reserved groove (5). The top of the embedded part (7) includes an assembly part that can be fixedly assembled with the anchoring bar (4) and / or a connecting plate (6) that can be fixedly assembled with the anchoring bar (4). The connecting plate (6) is a strip-shaped sheet structure. The anchoring bar (4) is fixed to the connecting plate (6) or the assembly part through the lap rib (10) by welding, screws, bolts, etc. The invention relates to a method for preparing an embedded part (7) of a bridge structure having a plurality of embedded parts, wherein the side or bottom of the embedded part (7) is connected to a fixing frame or a concrete inner steel bar (1) arranged in a concrete structure at the bottom of the reserved groove (5); the embedded part (7) is arranged in parallel and at intervals in the concrete structure at the bottom of the reserved groove (5) provided at the beam end or the bridge head; the distance between the top of the embedded part (7) and the bottom surface of the inner cavity of the reserved groove (5) is D, 0≤D≤10m; the lap rib (10) is rectangular, and the lap joint between the lap rib (10) and the anchor rib (4) is penetrated by a horizontal steel bar (3).

2. The connecting mechanism of the highway bridge expansion device according to claim 1 is characterized in that The side or bottom of the embedded part (7) is connected to the fixing frame or the internal concrete steel bar (1) arranged in the concrete structure at the bottom of the reserved groove (5) by welding, binding connection, quick-connect fastening, screw connection, bolt connection or a combination thereof.

3. The connecting mechanism of the telescopic device according to claim 1 is characterized in that The 0≤D≤5mm.

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