A single-span beam walking jacking erection technology with a counter beam structure

Abstract

The present invention discloses a single-span beam-mounted walking jacking erection process with an inverted beam structure, comprising the following steps: S0, the inverted beam is composed of a front leg, a middle leg I, a middle leg II, and a rear leg; S1, transporting the whole span of the main beam to be installed to the tail end of the inverted beam and folding the rear leg; S2, continuing to transport the main beam to be installed under the middle leg I and the middle leg II; S3, temporarily connecting the main beam to be installed and the inverted beam; S4, jacking the main beam to be installed forward; S5, when the main beam to be installed is jacked to the design position. S6, unfolding all legs and releasing the temporary connection between the main beam and the inverted beam; Step S7, lowering the height of the rear jacking support below the pier top and lowering the main beam to be installed to the design elevation. S8, removing the rear jacking support. S9, repeating S1-S8 until the jacking construction of the main beam in the subsequent widened section is completed. The jacking erection process of the present invention is suitable for the construction of the main beam under the spatial conditions where the longitudinal arrangement of the piers, the beam width and the change of the fulcrum position are irregular and the erection of the support is restricted.

Description

Technical Field

[0001] The present invention relates to the field of incremental launching of steel box girders. More specifically, the present invention relates to a single-span beam-mounted walking incremental launching construction technology with an anti-beam structure. Background Art

[0002] In recent years, with the rapid development of the national economy, the original service level of expressways in economically developed areas no longer meets the development needs. Coupled with the diseases of expressways themselves, the reconstruction and expansion of expressways have become a trend. The design and construction plans for engineering reconstruction and expansion need to be adapted to local conditions, and unconventional technologies are used to complete the construction of special node projects. Especially for the three-dimensional expansion project of expressway bridges passing through developed urban areas, due to its complex control factors, limited expansion space, large existing traffic volume, high traffic maintenance requirements, irregular pier plane layout and cross-section structure, it is difficult to meet the needs of three-dimensional reconstruction and expansion projects according to the existing conventional construction technologies. Therefore, it is necessary to study the construction technology of bridges with variable beam widths and irregular pier layouts under limited space conditions to solve the problems of construction in complex environments and special-shaped bridges. Summary of the Invention

[0003] In order to achieve these and other advantages according to the present invention, a single-span beam-mounted walking incremental launching construction technology with an anti-beam structure is provided, including the following steps:

[0004] Step S0: Install the incremental launching equipment. The incremental launching equipment includes an anti-beam, front legs, middle leg one, middle leg two, and rear legs. The legs can be folded and moved. The anti-beam is successively erected on the installed bridge through the front legs, middle leg one, middle leg two, and rear legs. Rear jacking brackets, front jacking brackets, and rear-span jacking brackets are successively arranged at the front end of the installed bridge;

[0005] The front legs, the middle leg one, the middle leg two, and the rear legs can be folded upward or retracted, and there is a certain distance between the anti-beam and the installed bridge. The space between the two is for the transportation of the main girder to be installed to pass through;

[0006] Step S1: Transport the main girder to be installed onto the installed bridge and place it below the tail end of the anti-beam;

[0007] Fold or retract the rear legs. At this time, the anti-beam is erected on the installed bridge through the front legs, middle leg one, and middle leg two;

[0008] Continue to transport the main girder to be installed forward to the rear side of the middle leg two;

[0009] Step S2: Expand the rear legs, and fold or retract the middle leg one and the middle leg two. At this time, the anti-beam is erected on the installed bridge through the front legs and the rear legs;

[0010] Continue to transport the main girder to be installed below the first intermediate support leg and the second intermediate support leg, and the front end of the main girder to be installed is located above the rear jacking support.

[0011] Step S3: Move the second intermediate support leg backward and unfold it, use the beam transport vehicle to jack up the main girder to be installed, and temporarily connect the main girder to be installed and the counter beam. At this time, the load of the main girder to be installed is transferred to the counter beam.

[0012] Step S4: Fold or retract the first intermediate support leg and the front support leg. At this time, the counter beam is supported on the installed bridge through the rear support leg and the second intermediate support leg. Use the jacking device to continue to jack up the main girder to be installed forward. During the jacking process, the rear support leg and the counter beam move forward synchronously; during the jacking process, the jacking fulcrum of the rear jacking support is lower than the jacking fulcrum of the front jacking support.

[0013] Step S5: When the main girder to be installed is jacked to the designed position, at this time, the front support leg and the first intermediate support leg are exactly located directly above the rear-span jacking support and the front jacking support, and unfold the front support leg and the first intermediate support leg to support on the rear-span jacking support and the front jacking support respectively.

[0014] Preferably, it further includes: Step S6: Fold or retract the rear support leg.

[0015] Step S7: Unfold the rear support leg, lower the height of the rear jacking support so that its top is lower than the designed elevation of the main girder to be installed, release the temporary connection between the counter beam and the main girder to be installed, lower the main girder to be installed to the designed elevation, and land it at the pier top position to complete the installation of the main line. At this time, the main girder to be installed and the installed bridge are seamlessly docked.

[0016] Preferably, it further includes: Step S8: Demolish the rear jacking support.

[0017] Preferably, it further includes: Step S9: Repeat the above steps S1 - S8 until the jacking construction of the main girder in the subsequent widened section is completed.

[0018] Preferably, in Steps S1 and S2, use the beam transport vehicle to transport the main girder to be installed. The main girder to be installed is placed on the beam transport vehicle, and in Step S6, after folding or retracting the rear support leg, the beam transport vehicle is withdrawn.

[0019] Preferably, there are at least two counter beams, which are arranged in parallel with each other and are located in the same plane. The adjacent two counter beams are connected through a counter beam horizontal bracing.

[0020] Preferably, a guide beam for the walking of the walking type jacking device is arranged on the counter beam.

[0021] Preferably, in the step S7, a jack is used to lower the main girder to be installed to the designed elevation.

[0022] The present invention has at least the following beneficial effects: The incremental launching construction technology of the steel box girder of the present invention is applicable to the situation where the steel box girder has a large volume, a large self-weight, irregular changes in the beam width, the width projection range of the steel box girder covers the highway lane, and the erection of the ground support is very limited in space.

[0023] Other advantages, objectives and features of the present invention will be partially reflected by the following description, and partially will also be understood by those skilled in the art through the research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a construction schematic diagram of step S1 in an embodiment of the present invention;

[0025] Figure 2 It is a construction schematic diagram of step S2 in an embodiment of the present invention;

[0026] Figure 3 It is a construction schematic diagram of step S3 in an embodiment of the present invention;

[0027] Figure 4 It is a construction schematic diagram of step S4 in an embodiment of the present invention;

[0028] Figure 5 It is a construction schematic diagram of step S5 in an embodiment of the present invention;

[0029] Figure 6 It is a construction schematic diagram of step S6 in an embodiment of the present invention;

[0030] Figure 7 It is a construction schematic diagram of step S7 in an embodiment of the present invention;

[0031] Figure 8 It is a layout schematic diagram of the incremental launching system viewed from the tail end direction in an embodiment of the present invention;

[0032] Figure 9 It is a layout schematic diagram of the incremental launching system viewed from the front end direction in an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0033] The following further describes the present invention in detail with reference to the drawings, so that those skilled in the art can implement it according to the description in the specification.

[0034] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments in the following description are only examples, and other obvious variations can be conceived by those skilled in the art. The basic principles defined in the following description of the present invention can be applied to other implementation schemes, variant schemes, improvement schemes, equivalent schemes, and other technical schemes that do not depart from the spirit and scope of the present invention.

[0035] Those skilled in the art should understand that in the disclosure of the present invention, the orientation or positional relationship indicated by terms such as "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting the present invention.

[0036] It can be understood that the term "a" should be understood as "at least one" or "one or more". That is, in one embodiment, the number of an element can be one, while in other embodiments, the number of the element can be multiple. The term "a" should not be construed as a limitation on the quantity.

[0037] As Figures 1-9 shown, an embodiment of the present invention provides a single-span beam walking jacking erection process with a counter beam structure, which is a construction process mainly for wide-width variable-width steel box girders with a large volume, heavy self-weight, irregular beam width changes, a steel box girder width projection range covering 900 of the highway carriageway, and very limited erection of ground supports. It includes the following steps:

[0038] Step S0: Install the jacking erection equipment. The jacking erection equipment includes a counter beam, front legs, middle leg one, middle leg two, and rear legs. The counter beam 100 is successively erected on the installed bridge 300 through the front legs 210, middle leg one 220, middle leg two 230, and rear legs 240, and is also erected above the bridge deck of the old bridge 700. The old bridge is above the ground line 800. Rear jacking supports 410, front jacking supports 420, and rear-span jacking supports 430 are successively arranged at the front end of the installed bridge 300; among them, the counter beam is arranged according to the bridge span, and the front legs 210, middle leg one 220, middle leg two 230, and rear legs 240 are successively distributed along the direction from the side span to the middle span of the bridge, and the rear jacking supports 410, front jacking supports 420, and rear-span jacking supports 430 are also successively distributed along the direction from the side span to the middle span of the bridge.

[0039] The front outriggers 210, the first middle outriggers 220, the second middle outriggers 230, and the rear outriggers 240 can all be folded upward or retracted. Moreover, there is a certain distance between the counter beam 100 and the installed bridge 300, and the space between the two is for the transportation of the main girder 500 to be installed to pass through;

[0040] It should be noted that there are at least two counter beams 100, which are arranged in parallel with each other and located in the same plane. The adjacent counter beams 100 are connected by a counter beam horizontal bracing 110. In this way, all the counter beams can form a whole, improving the overall load-bearing capacity and also improving the stability during the later hoisting process.

[0041] When there are multiple counter beams 100, there are multiple rear jacking supports 410, front jacking supports 420, and rear span jacking supports 430, and there is a one-to-one correspondence with the number of counter beams 100. That is, one rear jacking support 410, one front jacking support 420, and one rear span jacking support 430 form a set of jacking supports to correspondingly erect the same counter beam. If there are three counter beams 100, then three rear jacking supports 410, three front jacking supports 420, and three rear span jacking supports 430 correspondingly erect the same three counter beams. Moreover, the rear jacking supports 410, the front jacking supports 420, and the rear span jacking supports 430 are all close to the pier columns. The working position can be guaranteed, and the erection and dismantling are safe and reliable, with a high turnover utilization rate.

[0042] Among them, the rear jacking support 410, the front jacking support 420, and the rear span jacking support 430 are floor supports, and the bottom of the support falls on the top of the bridge cap, and the setting position changes with the position of the pier.

[0043] It should be noted that the position of the counter beam 100 can be moved horizontally to adapt to the change of the fulcrum position between different spans, especially for the jacking erection of the bridge girder in the widened section.

[0044] Step S1: Transport the main girder 500 to be installed onto the installed bridge 300 and place it below the tail end of the counter beam 100;

[0045] Fold or retract the rear outriggers 240. At this time, the counter beam 100 is erected on the installed bridge 300 through the front outriggers 210, the first middle outriggers 220, and the second middle outriggers 230;

[0046] Continue to transport the main girder 500 to be installed to the rear side of the second middle outriggers 230;

[0047] Step S2: Expand the rear outriggers 240, and fold or retract the first middle outriggers 220 and the second middle outriggers 230. At this time, the counter beam 100 is erected on the installed bridge 300 through the front outriggers 210 and the rear outriggers 240;

[0048] The main beam 500 to be installed is further transported to below the middle leg 1 220 and the middle leg 2 230 , and the front end of the main beam 500 to be installed is located above the rear push bracket 410 ;

[0049] Step S3, the second middle leg 230 is moved backward and unfolded, and the main beam 500 to be installed is lifted by a beam transport vehicle, and the main beam 500 to be installed and the counter beam 100 are temporarily connected, and at this time, the load of the main beam 500 to be installed is transferred to the counter beam 100;

[0050] Step S4, fold or retract the middle leg 1 220 and the front leg 210. At this time, the counter beam 100 is erected on the installed bridge 300 through the rear leg 240 and the middle leg 230, and the main beam 500 to be installed is continuously pushed forward by the pushing device. During the pushing process, the rear leg 240 and the counter beam 100 move forward synchronously. During the pushing process, the pushing fulcrum of the rear pushing bracket 410 is lower than the pushing fulcrum of the front pushing bracket 420. At this time, the rear pushing bracket 410 supports the main beam to be installed, and the front pushing bracket 420 supports the counter beam.

[0051] Step S5, when the main beam 500 to be installed is pushed to the designed position, the front support leg 210 and the middle support leg 220 are just located above the rear span pushing bracket and the front pushing bracket 420, and the front support leg 210 and the middle support leg 220 are unfolded to support the rear span pushing bracket and the front pushing bracket 420 respectively.

[0052] Step S6, folding or retracting the rear legs 240;

[0053] Step S7, unfold the rear support legs 240, lower the height of the rear push bracket 410 so that its top is lower than the design elevation of the main beam 500 to be installed, release the temporary connection between the counter-beam 100 and the main beam 500 to be installed, lower the main beam 500 to be installed to the design elevation, and drop it to the pier top position to complete the main line installation. At this time, the main beam 500 to be installed and the installed bridge 300 are seamlessly connected.

[0054] Step S8: remove the rear push bracket 410.

[0055] Step S9, repeat the above steps S1-S8 until the subsequent widening section main beam top-pushing construction is completed.

[0056] That is to say, the counter beam 100 and the main beam 500 to be installed are fixed together and move synchronously during the jacking. When jacking, the counter beam 100 is the front support point, and after the jacking is in place, the counter beam 100 is also the lifting point for lowering the main beam 500 to be installed. The counter beam 100 and the main beam 500 to be installed are temporarily fixedly connected during movement, and the temporary connection is released after being in place. The main beam 500 to be installed is lowered to the pier synchronously by the continuous jack on the counter beam 100 or other lowering systems.

[0057] In another embodiment, in steps S1 and S2 of the walking type jacking erection process on a single-span beam with a counter beam structure, the main beam 500 to be installed is transported by a beam transport vehicle 600. The main beam 500 to be installed is placed on the beam transport vehicle, and in step S6, after folding or retracting the rear legs 240, the beam transport vehicle is withdrawn.

[0058] In another embodiment, a guide beam for the walking type jacking device to travel is provided on the counter beam 100 of the walking type jacking erection process on a single-span beam with a counter beam structure. When the counter beam is jacked, it is the guide beam, and when lowered, it is the lifting beam, serving "two purposes with one beam".

[0059] In another embodiment, in step S7 of the walking type jacking erection process on a single-span beam with a counter beam structure, the main beam 500 to be installed is lowered to the design elevation by a jack.

[0060] Single-span integral installation and erection have high efficiency, can adapt to complex environments such as variable widths and variable support points, have high efficiency in cyclic operations, do not consider the assembly transportation and support turnover time, and only take 2 days for single-span installation. The construction is safe, reliable and fast, and has high efficiency for the installation of long-distance, multi-span and variable-width steel beams.

[0061] Although the embodiments of the present invention have been disclosed as above, it is not limited to only the applications listed in the specification and embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the field, additional modifications can be easily made. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the illustrated and described examples here.

Claims

1. A single-span beam-mounted walking jacking erection process with a counter beam structure, characterized in that, The following steps are involved: Step S0, installing a jacking erection device, the jacking erection device comprising a counter beam, a front leg, a middle leg one, a middle leg two, and a rear leg, and the legs can be folded and moved; the counter beam is sequentially erected on the installed bridge through the front leg, the middle leg one, the middle leg two, and the rear leg, and the front end of the installed bridge is sequentially provided with a rear jacking bracket, a front jacking bracket, and a rear span jacking bracket; The front legs, the first middle legs, the second middle legs and the rear legs can all be folded upward or retracted, and the counter beam and the installed bridge are separated by a certain distance, and the space between the two is for the main beam to be installed to be transported through; Step S1, transporting the main beam to be installed to the installed bridge and placing it below the tail end of the counter beam; Fold or retract the rear legs, and the counter beam is supported on the installed bridge through the front legs, the first middle leg, and the second middle leg; The main beam to be installed is further transported forward to the rear side of the second middle leg; Step S2, unfolding the rear legs, folding or retracting the middle legs 1 and 2, and at this time, the reverse beam is erected on the installed bridge through the front legs and the rear legs; The main beam to be installed is further transported to below the middle leg 1 and the middle leg 2, and the front end of the main beam to be installed is located above the rear push bracket; Step S3, moving the second middle leg backward and unfolding it, and using a beam transport vehicle to lift the main beam to be installed, and temporarily connecting the main beam to be installed and the counter beam, at which time the load of the main beam to be installed is transferred to the counter beam; Step S4, fold or retract the middle leg 1 and the front leg, at which time the counter beam is erected on the installed bridge through the rear leg and the middle leg 2, and the main beam to be installed is continuously pushed forward by the pushing device. During the pushing process, the rear leg and the counter beam move forward synchronously, and during the pushing process, the pushing fulcrum of the rear pushing bracket is lower than the pushing fulcrum of the front pushing bracket; Step S5, when the main beam to be installed is pushed to the designed position, the front supporting leg and the middle supporting leg 1 are just located above the rear span pushing bracket and the front pushing bracket, and the front supporting leg and the middle supporting leg 1 are unfolded to support the rear span pushing bracket and the front pushing bracket respectively; Step S6, folding or retracting the rear legs; Step S7, unfold the rear legs, lower the height of the rear push support so that the top of the support is lower than the design elevation of the main beam to be installed, release the temporary connection between the counter beam and the main beam to be installed, lower the main beam to be installed to the design elevation, and drop it on the pier top position to complete the main line installation, and at this time, the main beam to be installed and the installed bridge are seamlessly connected; Step S8, removing the rear push bracket; Step S9, repeat the above steps S1-S8 until the subsequent widening section main beam top-pushing construction is completed.

2. The single-span beam-mounted walking jacking erection process with a counter beam structure according to claim 1, characterized in that, In step S1 and step S2, the main beam to be installed is transported by a beam transport vehicle, and the main beam to be installed is placed on the beam transport vehicle. In step S6, after the rear legs are folded or retracted, the beam transport vehicle is withdrawn.

3. The single-span beam-mounted walking jacking erection process with a counter beam structure according to claim 1, characterized in that There are at least two of the inverted beams, which are arranged parallel to each other and located in the same plane, and are connected by an inverted beam horizontal connection between two adjacent inverted beams.

4. The single-span beam-mounted walking jacking erection process with a counter beam structure according to claim 1, characterized in that A guide beam for the walking of the walking jacking device is arranged on the inverted beam.

5. The single-span beam walking jacking erection process with a counter beam structure according to claim 1, characterized in that, In the step S7, a jack is used to lower the main beam to be installed to the designed elevation.

Images