A method for installing double-width small-spacing curved steel box girders

Abstract

The present invention discloses a method for installing a double-span, small-spacing curved steel box girder, belonging to the technical field of bridge installation. The method is used for installing a left-span bridge and a right-span bridge, preventing collisions between the two bridges, which are arranged side by side, during installation. The method provided by the present invention elevates a curved box girder installed on one of the side-by-side piers and uses a jacking method to push the raised curved box girder forward to complete the span between the two piers. The curved box girder is then lowered and installed on the two piers. Because one curved box girder is higher than the other, collisions and rollovers during the installation of the curved steel box girder are avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of bridge installation, and is used for the installation of a left-span bridge and a right-span bridge to avoid collision between the left-span bridge and the right-span bridge arranged side by side during the installation process, and in particular relates to a method for installing a double-span small-spacing curved steel box girder. Background Art

[0002] A double-span steel box girder bridge refers to two steel box girder bridges placed side by side, each allowing only one-way traffic. This applies to expressways or first-class highways, where the incoming and outgoing lanes are separate and the bridges are two side-by-side. In the construction of highways, railways, or urban bridges, double-span steel box girder bridges are widely used as bridge superstructures due to their excellent mechanical properties and prefabrication capabilities. The mechanical advantages of steel box girders include light weight, a high elastic modulus, high bearing capacity, low cost, and ease of construction using a variety of different methods.

[0003] like Figure 1 The double-span, small-spacing curved steel box girder bridge shown includes piers arranged side by side, with a curved box girder installed on one of the piers. Existing technology for installing double-span, small-spacing curved steel box girder bridges mostly uses the jacking method for construction. During construction, due to the small distance between the left and right span bridges and their curved form, the left and right span bridges can easily deviate laterally during construction, causing a collision. The jacking method cannot effectively control the jacking position of the small-spacing curved bridge, which can easily cause a collision between the left and right span bridges, causing damage to the steel box girder body and possibly causing the box girder to overturn, resulting in a serious engineering accident. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for installing double-width small-spacing curved steel box girders, so as to solve the problem in the prior art that the left-width bridge and the right-width bridge are prone to collision during installation.

[0005] The technical solution adopted by the present invention is as follows: a method for installing a double-width, small-spacing curved steel box girder, comprising bridge piers arranged side by side, one of which is provided with a curved box girder, the method comprising the following steps:

[0006] Installation equipment: The equipment includes a lifting mechanism and a pushing mechanism. The lifting mechanism is detachably installed on another pier, and the pushing mechanism is then installed on the lifting mechanism. Finally, the curved box girder is installed on the pushing mechanism.

[0007] Raising the curved box girder: raising the curved box girder by the lifting mechanism, wherein the height of the curved box girder is higher than the curved box girder on one of the piers;

[0008] Pushing the curved box girder: the pushing mechanism drives the curved box girder to a suitable position above the two piers;

[0009] Lowering the curved box girder: lowering the curved box girder to a suitable position through the lifting mechanism and installing it on the two piers.

[0010] The installation device further includes a widened support frame, the widened support frame includes an upper support frame and a lower support frame, and the lifting mechanism includes a first lifting assembly, a second lifting assembly, and a third lifting assembly;

[0011] Removably mounting the lower bracket on the cap beam of the pier;

[0012] Removably mounting a first lifting assembly and a second lifting assembly on the lower bracket, wherein the upper end of the first lifting assembly contacts the upper bracket, and the upper end of the second lifting assembly extends beyond the upper end of the upper bracket;

[0013] Installing the pushing mechanism on the upper bracket;

[0014] The third lifting assembly is installed on the bridge pier, and the upper end of the third lifting assembly extends into the widened bracket.

[0015] The first lifting assembly, the second lifting assembly, and the third lifting assembly respectively include a jack and a plurality of mounting support seats;

[0016] Installing the plurality of mounting support seats on the first lifting assembly and the second lifting assembly on the lower bracket respectively;

[0017] Then, the jacks on the first lifting assembly and the second lifting assembly are respectively installed on the mounting support base, and the remaining mounting support bases are installed on the jacks, wherein the mounting support base on the first lifting assembly contacts the lower end of the upper bracket, and the mounting support base on the second lifting assembly extends out of the upper end of the upper bracket;

[0018] The plurality of mounting support seats on the third lifting assembly are respectively installed on the bridge piers, the jack on the third lifting assembly is then installed on the mounting support seat, and the remaining mounting support seats are installed on the jack, wherein the upper ends of the mounting support seats extend into the lower bracket.

[0019] The installation device further includes a translation mechanism, which includes a telescopic assembly and a slide, wherein a push rod end of the telescopic assembly is connected to the slide:

[0020] The telescopic assembly is fixedly mounted on the upper bracket;

[0021] Then, the slide plate is slidably arranged on the upper bracket;

[0022] The pushing mechanism is then installed on the slide plate.

[0023] The raising of the curved box girder includes detecting the height of the curved box girder installed on the pushing mechanism, wherein the height includes the height of the curved box girder being higher than the curved box girder on one of the bridge piers and the height of the curved box girder being lower than the curved box girder on one of the bridge piers, wherein when the curved box girder is higher than the height of the curved box girder on one of the bridge piers, the next operation is performed.

[0024] The curved box girder being lower than one of the piers includes raising the curved box girder;

[0025] Increasing the number of mounting support seats on the second lifting assembly, wherein the upper end surface of the mounting support seat is parallel to the lower end of the curved box girder;

[0026] raising the curved box girder by means of a jack on the second lifting assembly, wherein the height of the curved box girder is higher than the height of the curved box girder on one of the piers;

[0027] activating a jack on a portion of the first lifting assembly disposed on the lower support to raise the upper support and the jacking mechanism, wherein the upper end of the jacking mechanism is parallel to the lower end of the curved box girder;

[0028] The number of mounting support seats is increased on the adjacent first lifting components, and the upper end surface of the mounting support seat is parallel to the lower end of the upper bracket.

[0029] The jacking of the curved box girder includes moving both ends of the curved box girder to appropriate positions above the two piers by a jacking method;

[0030] When both ends of the curved box girder are respectively located at appropriate positions above the two piers, the next operation is performed on the curved box girder.

[0031] The descending curved box girder comprises:

[0032] Raise the curved box girder again by the jack on the second lifting assembly, wherein there is a certain distance between the lower end surface of the curved box girder and the jacking mechanism, and remove the jacking mechanism and the upper bracket;

[0033] Lowering the curved box girder by using the jack on the second lifting assembly, wherein the lower end surface of the curved box girder contacts the first lifting assembly, and removing the second lifting assembly;

[0034] Lifting the curved box girder by the jack on the third lifting assembly, wherein there is a certain distance between the lower end surface of the curved box girder and the first lifting assembly, and removing the first lifting assembly and the lower bracket;

[0035] The curved box girder is lowered by the jack on the third lifting assembly, wherein the lower end surface of the curved box girder contacts the support on the pier, and the third lifting assembly is removed.

[0036] The first lifting assembly, the second lifting assembly, and the third lifting assembly respectively drop the beams by extracting and installing the support seats one by one, including:

[0037] Raising the mounting support seat provided on the jack by the jack on the second lifting assembly, wherein the raised height is the height of one mounting support seat;

[0038] Remove the upper bracket on the widened bracket and a mounting support on the first lifting assembly;

[0039] Lowering the height of the mounting support provided on the second lifting assembly, wherein the height is the height of two mounting support seats, and removing one mounting support seat on the second lifting assembly;

[0040] Repeat the above steps to complete the curved box girder falling on the lower support of the widened support.

[0041] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0042] The method provided by the present invention is to preferentially install curved box girder A on one of the piers arranged side by side. After completion, a lifting mechanism is installed on the other pier, and a pushing mechanism is installed on the lifting mechanism. The curved box girder B is installed on the pushing mechanism. The lifting mechanism drives the pushing mechanism and the curved box girder B to rise and surpass the curved box girder A. The pushing mechanism drives the curved box girder B to complete the span between the two piers. After completion, it is lowered by the lifting mechanism and installed on the other pier. Since the curved box girder A is installed first, the curved box girder B is higher than the curved box girder A. During the installation process, the curved box girder B is prevented from colliding with and overturning the curved box girder A.

[0043] The method provided by the present invention raises the curved box girder provided on one of the piers arranged side by side, and uses the jacking method to push the raised curved box girder in to complete the span between the two piers. The curved box girder is then lowered and installed on the two piers. Since one of the curved box girder is higher than the other, collision and rollover are avoided during the installation of the curved steel box girder. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 This is a schematic diagram of the installation of a curved steel box girder in the prior art;

[0045] Figure 2Schematic diagram of the installation of the curved steel box girder in this embodiment;

[0046] Figure 3 This is a schematic diagram of the installation of the bridge piers and equipment in this embodiment;

[0047] Figure 4 This is a schematic diagram of the installation of the widened bracket and the bridge pier in this embodiment;

[0048] Figure 5 This is a schematic diagram of the installation of the widening bracket and the lifting assembly in this embodiment;

[0049] Figure 6 This is a schematic diagram of the lifting assembly in this embodiment;

[0050] Figure 7 It is a flowchart of the present invention.

[0051] In the figure: 1 curved box girder, 2 bridge pier, 3 pushing mechanism, 4 lifting mechanism, 5 translation mechanism, 6 widened support frame, 7 support column. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0053] like Figure 2-Figure 3 As shown, a method for installing a double-span, small-spacing curved steel box girder is used, and an installation device is used to complete the installation of the double-span, small-spacing curved steel box girder. The installation device includes piers 2 arranged side by side, and a curved box girder 1 is provided on one of the piers 2. The equipment includes a lifting mechanism 4 arranged on the other pier 2, and a pushing mechanism 3 is provided on the lifting mechanism 4. The curved box girder 1 is installed on the pushing mechanism 3. The height of the curved box girder 1 located on the pushing mechanism exceeds the curved box girder 1 provided on one of the piers 2. The pushing mechanism 3 drives the curved box girder 1 to complete the installation between the two piers 2, and is lowered by the lifting mechanism 4 to be installed on the other pier 2. Since one of the curved box girders 1 is installed first, the other curved box girder 1 is lifted higher than the one of the installed curved box girders 1 by the lifting mechanism 4 to avoid collision and overturning of the two curved box girders during the installation process.

[0054] like Figure 1As shown, a curved box girder 1 is installed on one of the piers 2 arranged side by side. The curved box girder 1 is installed by using a jacking method. The bridge jacking method refers to a construction method in which the beam body is cast or assembled in sections at the bridge head, and is longitudinally pushed by a jack so that the beam body is put into place through temporary sliding supports on the top of each pier. This method is a prior art. This embodiment uses this method to complete the installation of the curved box girder 1 on one of the piers 2 arranged side by side. The double-span curved steel box girder bridge in this example has a left-span bridge with a total length of 413m, located in the right-turning flat curve and the transition curve section with R=460m and Ls=80m, and a right-span bridge with a total length of 406m, located in the right-turning flat curve and the transition curve section with R=375m and Ls=80m, with a maximum spacing of 0.488m.

[0055] like Figure 4-Figure 6As shown, in combination with the above embodiment, the curved box girder 1 is installed on another pier 2 on the piers 2 arranged side by side, and a lifting mechanism 4 is installed on the pier 2. The lifting mechanism 4 includes a first lifting assembly, a second lifting assembly, and a third lifting assembly. The first lifting assembly, the second lifting assembly, and the third lifting assembly respectively include a jack and a plurality of mounting support seats. Each group of lifting assemblies includes a jack and a plurality of mounting support seats, and they are stacked on each other to a certain height. The jack drives the plurality of mounting support seats to move up and down to complete the lifting of the curved box girder 1; the third lifting assemblies are respectively arranged on the pier 2, and four support seats are respectively installed on the four corners of the pier 2, and one of them is installed The support seats are respectively installed on the pier 2, and then the jacks are respectively installed on the installation support seats, and multiple installation support seats are respectively stacked and installed on the jacks in sequence; a widened support frame 6 is installed on the pier 2, and the widened support frame 6 includes an upper bracket and a lower bracket. The upper bracket and the lower bracket respectively include two oppositely arranged cross plates, and the cross plates are I-beams. The two oppositely arranged I-beams are detachably connected by connecting plates and bolts. The lower bracket is installed on the cap beam of the pier 2, and two support plates are obliquely arranged on both sides of the lower end of the lower bracket. The other ends of the two support plates are detachably connected to the two sides of the pier 2 by bolts to improve the supporting force of the lower bracket. The upper ends of the third lifting components pass through the lower brackets, that is, Passing through the gap between the two horizontal plates; a plurality of support columns 7, a plurality of first lifting assemblies and a second lifting assemblies are provided on the lower bracket, the two ends of the plurality of support columns 7 are respectively in contact with the upper end of the upper bracket and the lower end of the upper bracket, the lower ends of the plurality of first lifting assemblies are in contact with the upper end of the lower bracket, the upper ends of the plurality of first lifting assemblies are in contact with the lower end of the upper bracket, the upper bracket and the lower bracket are connected and supported by the plurality of first lifting assemblies and the plurality of support columns 7 to form a lifting mechanism 4 for lifting the curved box girder 1, the upper bracket is pressed on the plurality of first lifting assemblies and the plurality of support columns 7 by its own weight, and the widened support frame 6 composed of the upper bracket and the lower bracket and the plurality of first lifting assemblies and the plurality of support columns 7 is placed on the pier 2 On the cap beam, it is possible to bear the weight of the curved box beam 1 while widening and raising the bridge pier, and to raise the curved box beam 1 to facilitate the later disassembly. The purpose of setting the widened support frame 6 is that, since the distance between the first curved box beam 1 and the second curved box beam 1 is small, and due to the influence of the curve form, there will be unavoidable lateral offset, so it is necessary to raise and widen the pier top when the second curved box beam 1 is pushed, so as to prevent the second curved box beam 1 from colliding with the first curved box beam 1 during the pushing process; the lower ends of the multiple second lifting assemblies are in contact with the upper end of the lower bracket, and the upper ends of the multiple second lifting assemblies pass through the upper end of the upper bracket, that is, through the gap between the two horizontal plates in the upper bracket;Two translation mechanisms 5 are positioned relative to each other on the upper bracket, with a gap between them. Each translation mechanism 5 comprises a slide and a telescopic assembly. The fixed end of the telescopic assembly is fixedly connected to the upper bracket, the push rod end of the telescopic assembly is connected to the slide, and the lower end surface of the slide is slidably connected to the upper bracket. The slide is directly mounted on the upper bracket. Each slide is provided with a pushing mechanism 3, which is a walking-type pushing jack. The telescopic assembly is a longitudinal jack. The jack drives the slide to extend and retract back and forth, thereby driving the walking-type pushing jack to extend and retract back and forth, facilitating the correction of deviations of the curved box girder 1 mounted on the pushing mechanism 3.

[0056] like Figure 2 As shown, the curved box girder 1 is installed: the curved box girder 1 is pushed, and the double-span curved box girder 1 is in a flat curve section. During the pushing process, lateral displacement is inevitable, which will cause collisions with adjacent curved box girders 1. Therefore, a widened support frame 6 is used to widen and heighten the piers to provide lateral displacement margin during the pushing process; one end of the curved box girder 1 is installed on a walking pushing jack through auxiliary tools, and the span between the two piers 2 is completed by the pushing method. The pushing method used here is the same as the pushing method used in the above-mentioned implementation, and the purpose is to put the curved box girder 1 into place through the temporary sliding supports on the top of each pier. During the jacking process of the curved box girder 1, the deviation of the curved box girder 1 is corrected by two translation mechanisms 5, that is, the deviation of the center line of the curved box girder 1 is corrected; a lateral deviation control method is used to correct the curved box girder 1, and center line deviation monitoring points are set on the top surfaces of the front and rear ends of the curved box girder 1. Mileage markings are made on the outside of the bottom surface of the curved box girder 1 from the center line of the jacking system with a red paint pen, and the marking spacing is 1m. At the same time, a scale is drawn on the outside with a paint pen. During the jacking process, the operators located next to each jacking mechanism 3 can intuitively observe whether the advances on both sides are synchronized. Continuous observation is performed during the jacking process. If the center line deviation of the curved box girder 1 as a whole occurs during the construction process, the jacking construction is suspended and the deviation is corrected; when correcting, the displacement of the curved box girder 1 is adjusted laterally by two jacks in combination with the center line deviation monitoring points until it returns to its initial state with the curved box girder 1; here, the lateral deviation control method used for correction is the existing technology. This embodiment uses this method to complete the center line correction of the curved box girder 1 to complete the installation of the curved box girder 1 on one of the piers 2 arranged side by side. Since the curved box girders 1 arranged side by side on the piers 2 are not at the same level, when one of the curved box girders 1 is installed, the other curved box girder 1 is much higher, which avoids lateral displacement and collision of the curved box girder 1 during the jacking process.

[0057] Lowering the curved box girder: After the curved box girder 1 is pushed into place, the beam is lowered by extracting the installation support seats one by one; first: increase the number of installation support seats on the second lifting assembly. Since the upper end of the second lifting assembly extends out of the upper bracket, the number of installation support seats needs to be superimposed to contact with the lower end of the curved box girder 1, and then the curved box girder 1 is lifted up by the jack and separated from the pushing mechanism 3. At this time, the curved box girder 1 is supported by the second lifting assembly; then: remove the pushing mechanism 3 and the translation mechanism 5 installed on the upper bracket, and then lower the curved box girder 1 to be parallel to the upper bracket through the second lifting assembly. At this time, the curved box girder 1 is supported by the upper bracket, the first lifting assembly and the second lifting assembly; remove the widened support frame 6. Since the widened support frame 6 is composed of an upper bracket and a lower bracket, a support column arranged on the lower bracket and the first lifting assembly, the upper bracket and the lower bracket are respectively composed of two oppositely arranged cross plates and a connecting plate. At the same time, due to the dead weight of the curved box girder 1, it is necessary to adopt the method of extracting the installation support seats one by one to drop the beam, and the method of reducing the beam is unexpected.

[0058] Extracting the installation support seat: The structures of the first lifting assembly, the second lifting assembly and the third lifting assembly are the same; the curved box girder 1 is lifted up by the second lifting assembly and is higher than the upper support. At this time, the curved box girder 1 is supported by the second lifting assembly, and the distance between the curved box girder 1 and the upper support is kept within a certain distance, that is, the height of an installation support seat, to prevent the curved box girder 1 from shifting. When the curved box girder 1 shifts from the second lifting assembly, it can slide onto the upper support; the upper support is raised by the first lifting assembly, and the support column 7 is taken out. The upper support is lowered by the first lifting assembly, and the distance is the height of an installation support seat, and one installation support seat provided on the first lifting assembly is taken out respectively; the curved box girder 1 is lowered onto the upper support by the second lifting assembly, and the second lifting assembly is lowered again to the height of an installation support seat, and one installation support seat on the second lifting assembly is taken out respectively. At this time, the height of the curved box girder 1 is reduced to the height of one installation support seat; according to the above steps, the curved box girder 1 is lowered to a suitable position, and the installation support seats are extracted piece by piece to drop the beam, so that the curved box girder 1 finally falls on the installation seat on the pier 2. When the mounting support seat on the second lifting assembly set on the upper bracket is removed, the curved box beam 1 is lifted up and higher than the second lifting assembly through the third lifting assembly. At this time, the curved box beam 1 is supported by the third lifting assembly, and the curved box beam 1 is higher than the height of one mounting support seat of the second lifting assembly, which is convenient for removing the second lifting assembly from the lower bracket and reducing accidents. The curved box beam 1 is then dropped onto the lower bracket through the third lifting assembly, and the third lifting assembly is lowered again, and one mounting support seat on the third lifting assembly is taken out. At this time, the curved box beam 1 is supported by the lower bracket; the curved box beam 1 is lifted up and higher than the second lifting assembly through the third lifting assembly. The lowering assembly lifts the curved box girder 1 and raises it above the height of one mounting support seat of the lower bracket. At this time, the curved box girder 1 is supported by the third lifting assembly, and the lower bracket is removed from the cap beam of pier 2. Since the lower bracket is composed of two cross plates and a connecting plate, the connecting plate and the cross plate are connected by bolts. The bolts on the connecting plate are removed and taken out from between the third lifting assembly and the curved box girder 1. The curved box girder 1 is dropped on the support seat on pier 2 again by the third lifting assembly to complete the beam dropping. The beam is dropped by removing the mounting support seat piece by piece to avoid displacement of the curved box girder 1 and reduce the risk of beam dropping.

[0059] like Figure 7As shown, a method for installing a double-width small-spacing curved steel box girder comprises bridge piers 2 arranged side by side, wherein a curved box girder 1 is arranged on one of the bridge piers 2, and is characterized in that the method comprises the following steps: installing equipment: the equipment comprises a lifting mechanism 4 and a pushing mechanism 3, the lifting mechanism 4 is detachably installed on the other bridge pier 2, the pushing mechanism 3 is then installed on the lifting mechanism 4, and the curved box girder 1 is then installed on the pushing mechanism 3; raising the curved box girder: the curved box girder 1 is raised by the lifting mechanism 4, wherein the height of the curved box girder 1 is higher than the curved box girder on one of the bridge piers 2. Beam 1; pushing the curved box girder: the pushing mechanism drives the curved box girder 1 to a suitable position above the two piers 2; lowering the curved box girder: the curved box girder 1 is lowered to a suitable position by the lifting mechanism 4 and installed on the two piers 2; the curved box girder 1 set on one of the piers 2 arranged side by side is raised, and the raised curved box girder 1 is pushed forward by the pushing method to complete the span between the two piers 2, and then the curved box girder 1 is lowered and installed on the two piers 2. Since one of the curved box girder 1 is higher than the other curved box girder, collision and rollover are avoided during the installation of the curved steel box girder.

[0060] like Figure 7As shown, the equipment required for installing the curved steel box girder includes: the equipment includes a widening support frame 6, a lifting mechanism 4, a translation mechanism 5 and a pushing mechanism 3, the widening support frame 6 includes an upper support and a lower support, the lower support is installed on the cap beam of the pier 2, and the lifting mechanism 4 is installed on the pier 2 and the lower support, the lifting mechanism 4 includes a first lifting assembly, a second lifting assembly, and a third lifting assembly, the first lifting assembly, the second lifting assembly, and the third lifting assembly respectively include a jack and a mounting support seat, the mounting support seats on multiple third lifting assemblies are respectively installed on the pier 2, and jacks are installed on multiple mounting support seats, and the remaining mounting support seats are installed on the jacks, wherein the mounting support seat at the upper end of the jack extends into the lower support, the first lifting assembly, the second lifting assembly and the support column are installed on the lower support, and the mounting support seats of multiple first lifting assemblies and second lifting assemblies are respectively installed on the lower support. , then install the jack on the installation support seat, and install the remaining installation support seats on the jack, install multiple support columns on the lower bracket, and then install the upper bracket on the installation support seat and support column of the first lifting assembly, wherein the installation support seat on the second lifting assembly extends out of the upper bracket; two translation mechanisms 5 are installed on the upper bracket, and the two translation mechanisms 5 are arranged opposite to each other and leave a certain distance. The two translation mechanisms 5 respectively include a telescopic assembly and a slide plate, the push rod end of the telescopic assembly is connected to the slide plate, and the fixed end of the telescopic assembly is fixedly connected to the upper bracket, and then two pushing mechanisms 3 are respectively installed on the two slide plates, the pushing mechanism 3 adopts a walking-type pushing device, and the telescopic assembly is a jack; then one end of the curved box girder 1 is installed on the two pushing mechanisms 3, and the other end of the curved box girder 1 is installed on the ground through the equipment. The equipment here has the same structure as the equipment mentioned above, and is used for simultaneously pushing the curved box girder 1 forward.

[0061] Raise the curved box girder: according to the current position of the curved box girder 1, detect the height of the curved box girder currently installed on the pushing mechanism 3. When the curved box girder on the pier is lower than the curved box girder on one of the piers, raise the curved box girder 1 on the pier 2; when the curved box girder on the pier is higher than the curved box girder on one of the piers, proceed to the next step; push the curved box girder; raise the curved box girder 1: increase the number of support seats installed on the second lifting assembly, and the upper end surface of the support seat is parallel to the lower end of the curved box girder 1; raise the curved box girder 1 by the jack on the second lifting assembly, and at the same time raise the first lifting assembly so that its upper bracket is parallel to the lower end of the curved box girder 1, and raise the curved box girder 1 by the first lifting assembly and the second lifting assembly, and exceed the height of one of the curved box girder 1.

[0062] Pushing the curved box girder: Pushing is performed using a walking-type pushing device. The translation mechanism 5 pushes the walking-type pushing device mounted on the slide plate longitudinally. During the lateral deviation correction process, the translation mechanism 5 is used to push the pushing device laterally on the slide. The pushing curved box girder here is installed using the pushing method. The bridge pushing method refers to a construction method in which the beam body is cast or assembled in sections at the bridge head, and is pushed longitudinally by jacks so that the beam body passes through the temporary sliding supports on the top of each pier to be in place. This method is a prior art. In this embodiment, this method is used to complete the installation of the curved box girder 1 on one of the piers 2 arranged side by side. During the jacking process, the deviation of the curved box girder 1 is corrected by two translation mechanisms 5, that is, the deviation of the center line of the curved box girder 1 is corrected; a lateral deviation control method is used to correct the curved box girder 1, and center line deviation monitoring points are set on the top surfaces of the front and rear ends of the curved box girder 1. Mileage markings are made on the outside of the bottom surface of the curved box girder 1 from the center line of the jacking system with a red paint pen, and the marking spacing is 1m. At the same time, scales are drawn on the outside with a paint pen. During the jacking process, the operators located next to each jacking mechanism 3 can intuitively observe whether the advances on both sides are synchronized. Continuous observation is made during the jacking process. If the center line deviation of the curved box girder 1 as a whole occurs during the construction process, the jacking construction is suspended and the deviation is corrected; when correcting, the displacement of the curved box girder 1 is adjusted laterally by two jacks in combination with the center line deviation monitoring points until it returns to its initial state with the curved box girder 1; here, the lateral deviation control method used for correction is the existing technology. This embodiment uses this method to complete the center line correction of the curved box girder 1 to complete the installation of the curved box girder 1 on one of the piers 2 arranged side by side. Since the curved box girders 1 arranged side by side on the piers 2 are not at the same level, when one of the curved box girders 1 is installed, the other curved box girder 1 is much higher, which avoids lateral displacement and collision of the curved box girder 1 during the jacking process.

[0063] Lowering the curved box girder: After the curved box girder 1 is pushed into place, the beam is lowered by extracting the installation support seats one by one; first: increase the number of installation support seats on the second lifting assembly. Since the upper end of the second lifting assembly extends out of the upper bracket, the number of installation support seats needs to be superimposed to contact with the lower end of the curved box girder 1, and then the curved box girder 1 is lifted up by the jack and separated from the pushing mechanism 3. At this time, the curved box girder 1 is supported by the second lifting assembly; then: remove the pushing mechanism 3 and the translation mechanism 5 installed on the upper bracket, and then lower the curved box girder 1 to be parallel to the upper bracket through the second lifting assembly. At this time, the curved box girder 1 is supported by the upper bracket, the first lifting assembly and the second lifting assembly; remove the widening support frame 6. Since the widening support frame 6 is composed of an upper bracket and a lower bracket, a support column arranged on the lower bracket and the first lifting assembly, and the upper bracket and the lower bracket are respectively composed of two oppositely arranged cross plates and connecting plates, due to the dead weight of the curved box girder 1, it is necessary to adopt the method of extracting the installation support seats one by one to lower the beam, and the method of lowering the beam is unexpected.

[0064] Extracting the installation support seat: The structures of the first lifting assembly, the second lifting assembly and the third lifting assembly are the same; the curved box girder 1 is lifted up by the second lifting assembly and is higher than the upper support. At this time, the curved box girder 1 is supported by the second lifting assembly, and the distance between the curved box girder 1 and the upper support is kept within a certain distance, that is, the height of an installation support seat, to prevent the curved box girder 1 from shifting. When the curved box girder 1 shifts from the second lifting assembly, it can slide onto the upper support; the upper support is raised by the first lifting assembly, and the support column 7 is taken out. The upper support is lowered by the first lifting assembly, and the distance is the height of an installation support seat, and one installation support seat provided on the first lifting assembly is taken out respectively; the curved box girder 1 is lowered onto the upper support by the second lifting assembly, and the second lifting assembly is lowered again to the height of an installation support seat, and one installation support seat on the second lifting assembly is taken out respectively. At this time, the height of the curved box girder 1 is reduced to the height of one installation support seat; according to the above steps, the curved box girder 1 is lowered to a suitable position, and the installation support seats are extracted piece by piece to drop the beam, so that the curved box girder 1 finally falls on the installation seat on the pier 2.

[0065] When the mounting support seat on the second lifting assembly set on the upper bracket is removed, the curved box beam 1 is lifted up and higher than the second lifting assembly through the third lifting assembly. At this time, the curved box beam 1 is supported by the third lifting assembly, and the curved box beam 1 is higher than the height of one mounting support seat of the second lifting assembly, which is convenient for removing the second lifting assembly from the lower bracket and reducing accidents. Then, the curved box beam 1 is dropped onto the lower bracket through the third lifting assembly, and the third lifting assembly is lowered again, and one mounting support seat on the third lifting assembly is taken out. At this time, the curved box beam 1 is supported by the lower bracket; through the third lifting assembly The component lifts the curved box girder 1 and makes it higher than the height of one installation support seat of the lower bracket. At this time, the curved box girder 1 is supported by the third lifting component, and the lower bracket is removed from the cap beam of pier 2. Since the lower bracket is composed of two cross plates and a connecting plate, the connecting plate and the cross plate are connected by bolts. The bolts on the connecting plate are removed, and the lower bracket is taken out from between the third lifting component and the curved box girder 1. The curved box girder 1 is dropped on the support seat on pier 2 again by the third lifting component to complete the beam dropping. The beam is dropped by extracting the installation support seat piece by piece to avoid displacement of the curved box girder 1 and reduce the risk of beam dropping.

[0066] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for installing a double-width, small-spacing curved steel box girder, comprising piers arranged side by side, one of which is provided with a curved box girder A, characterized in that: The method comprises the following steps: Installation equipment: The equipment includes a lifting mechanism and a pushing mechanism. The lifting mechanism is detachably installed on another pier, and the pushing mechanism is then installed on the lifting mechanism. Finally, the curved box girder B is installed on the pushing mechanism. Raising the curved box girder B: raising the curved box girder B by the lifting mechanism, wherein the height of the curved box girder B is higher than the curved box girder A on one of the piers; Pushing the curved box girder B: the pushing mechanism drives the curved box girder B to a suitable position above the two piers; Lowering the curved box girder B: lowering the curved box girder B to a suitable position by the lifting mechanism and installing it on the two piers; The installation device further includes a widened support frame, the widened support frame includes an upper support frame and a lower support frame, and the lifting mechanism includes a first lifting assembly, a second lifting assembly, and a third lifting assembly; Removably mounting the lower bracket on the cap beam of the pier; Removably mounting a first lifting assembly and a second lifting assembly on the lower bracket, wherein the upper end of the first lifting assembly contacts the upper bracket, and the upper end of the second lifting assembly extends beyond the upper end of the upper bracket; Installing the pushing mechanism on the upper bracket; Installing a third lifting assembly on the bridge pier, with the upper end of the third lifting assembly extending into the widened support frame; The first lifting assembly, the second lifting assembly, and the third lifting assembly respectively include a jack and a plurality of mounting support seats; Installing the plurality of mounting support seats on the first lifting assembly and the second lifting assembly on the lower bracket respectively; Then, the jacks on the first lifting assembly and the second lifting assembly are respectively installed on the mounting support base, and the remaining mounting support bases are installed on the jacks, wherein the mounting support base on the first lifting assembly contacts the lower end of the upper bracket, and the mounting support base on the second lifting assembly extends out of the upper end of the upper bracket; The plurality of mounting support seats on the third lifting assembly are respectively installed on the bridge piers, the jack on the third lifting assembly is then installed on the mounting support seat, and the remaining mounting support seats are installed on the jack, wherein the upper ends of the mounting support seats extend into the lower bracket.

2. The method according to claim 1, characterized in that The installation device further includes a translation mechanism, which includes a telescopic assembly and a slide, wherein a push rod end of the telescopic assembly is connected to the slide: Mounting the fixed end of the telescopic assembly on the upper bracket; Then, the slide plate is slidably arranged on the upper bracket; The pushing mechanism is then installed on the slide plate.

3. The method according to claim 2, characterized in that The raising of the curved box girder B includes detecting the height of the curved box girder B installed on the pushing mechanism, wherein the height includes the height of the curved box girder B being higher than the curved box girder A on one of the bridge piers and the height being lower than the curved box girder A on one of the bridge piers, wherein when the curved box girder B is higher than the height of the curved box girder A on one of the bridge piers, the next operation is performed.

4. The method according to claim 3, characterized in that When the height of the curved box girder B is lower than the curved box girder A on one of the piers, the curved box girder B is raised; Increase the number of mounting support seats on the second lifting assembly, and the upper end surface of the mounting support seat is parallel to the lower end of the curved box beam B; raising the curved box girder B by using the jack on the second lifting assembly so that the height of the curved box girder B is higher than the height of the curved box girder A on one of the piers; Activate the jacks on the first lifting assembly provided on the lower support to raise the upper support and the pushing mechanism, so that the upper end of the pushing mechanism is parallel to the lower end of the curved box girder B; The number of mounting support seats is increased on the adjacent first lifting components, and the upper end surface of the mounting support seat is parallel to the lower end of the upper bracket.

5. The method according to claim 4, characterized in that The jacking of the curved box girder B includes moving the two ends of the curved box girder B to appropriate positions above the two bridge piers by using a jacking method; When both ends of the curved box girder B are respectively located at appropriate positions above the two bridge piers, the curved box girder B is subjected to the next operation.

6. The method according to any one of claims 1 to 5, characterized in that The descending curved box girder B comprises: Raise the curved box girder B again by the jack on the second lifting assembly, wherein there is a certain distance between the lower end surface of the curved box girder B and the pushing mechanism, and remove the pushing mechanism and the upper bracket; Lowering the curved box girder B by the jack on the second lifting assembly, wherein the lower end surface of the curved box girder B contacts the first lifting assembly, and removing the second lifting assembly; Lifting the curved box girder B by the jack on the third lifting assembly, wherein there is a certain distance between the lower end surface of the curved box girder B and the first lifting assembly, and removing the first lifting assembly and the lower bracket; The curved box girder B is lowered by the jack on the third lifting assembly, wherein the lower end surface of the curved box girder B contacts the support on the pier, and the third lifting assembly is removed.

7. The method according to claim 6, characterized in that The first lifting assembly, the second lifting assembly, and the third lifting assembly respectively drop the beams by extracting and installing the support seats one by one, including: Raising the mounting support seat provided on the jack by the jack on the second lifting assembly, wherein the raised height is the height of one mounting support seat; Remove the upper bracket on the widened support frame and a mounting support seat on the first lifting assembly; Lowering the height of the mounting support provided on the second lifting assembly, wherein the height is the height of two mounting support seats, and removing one mounting support seat on the second lifting assembly; Repeat the above steps to complete the placement of the curved box beam B on the lower bracket of the widened support frame.

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