A pushing construction method for Warren truss

Abstract

The application relates to a pushing construction method for a Warren truss, a first supporting pier at a maximum pushing supporting reaction force is provided with a B-type sliding beam with a length of more than twice a module; a steel truss beam above the B-type sliding beam is a Warren truss; when vertical reaction force of a sliding shoe exceeding a set threshold is borne, the sliding shoe on the B-type sliding beam is switched to a pushing mode in which the sliding shoe is located at a large node position of the Warren truss in front and behind; and the Warren truss moves with the sliding shoe to perform pushing construction. The application provides a pushing construction method for a Warren truss, a first supporting pier at a maximum pushing supporting reaction force is provided with a B-type sliding beam with a length of more than twice a module, the length of a pushing support sliding beam is lengthened, when vertical reaction force of a sliding shoe exceeding a set threshold is borne, the sliding shoe is supported at large node positions of the Warren truss in front and behind, the Warren truss does not need to increase the sectional geometric size of components, and the structure weight in a non-permanent state is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bridge engineering, in particular to a variable modulus asynchronous incremental launching construction method for Warren truss. BACKGROUND

[0002] In double-deck combined bridges, large-span bridges generally adopt the structure of double-deck steel truss, among which Warren truss is often selected as the preferred truss bridge in cities due to its beautiful appearance.

[0003] If the truss adopts Warren truss, such as triangular truss with vertical rods, it is called Warren truss with vertical rods, which is composed of top chord, bottom chord and web rods. The nodes of the bottom chord of the Warren truss have two types of nodes, i.e. large nodes and small nodes. Due to the characteristics of their own structure, in the state of incremental launching construction commonly used in steel truss, the large nodes can bear large node counter forces, and the small nodes can only bear smaller counter forces.

[0004] Due to the limitation of waterway navigation, only one temporary support pier can be arranged within the navigation hole, and in the state of the largest cantilever of the incremental launching beam crossing the waterway, the sliding shoe on the temporary pier within the waterway will have an overlarge vertical counter force in the state of incremental launching. If the conventional incremental launching method is used, in order to meet the force requirement of incremental launching construction, a large number of vertical rods at the small nodes of the Warren truss need to be strengthened, the cross-sectional geometric size of the components is increased, and the structural self-weight in the non-permanent state is increased. SUMMARY

[0005] The embodiment of the present application provides a incremental launching construction method for Warren truss, to solve the technical problem of increasing the structural self-weight in the non-permanent state caused by strengthening the vertical rods at the small nodes of the Warren truss in the related art to meet the force requirement of incremental launching.

[0006] The embodiment of the present application provides a incremental launching construction method for Warren truss, which comprises: a first support pier at the largest support counter force of incremental launching is provided with a B-type sliding track beam with a modulus length of 2 times or more; and a steel truss above the B-type sliding track beam is a Warren truss.

[0007] When the vertical counter force of the sliding shoe exceeds a set threshold, the sliding shoe on the B-type sliding track beam is switched to a first incremental launching mode in which the front and rear positions of the sliding shoe are both located at the large node positions of the Warren truss.

[0008] The Warren truss moves with the sliding shoe to perform incremental launching construction.

[0009] In some embodiments, the sliding shoe on the B-type sliding track beam is switched to the first incremental launching mode in which the front and rear positions of the sliding shoe are both located at the large node positions of the Warren truss, which comprises:

[0010] The B-type sliding beam is provided with a second sliding shoe, two second jacks located on both sides of the second sliding shoe, and the second sliding shoe is located below a large node of the Warren truss.

[0011] The second jack is lifted, and the Warren truss is converted from being supported by the sliding shoe to being supported by the jack.

[0012] The second sliding shoe is shifted from below a previous large node of the Warren truss to below a subsequent large node, and the sliding shoe switching is completed.

[0013] The second jack is lowered, and the Warren truss is converted from being supported by the jack to being supported by the sliding shoe.

[0014] In some embodiments, the second supporting pier at other positions is provided with an A-type sliding beam with a length of 1 times the module.

[0015] In some embodiments, the A-type sliding beam is provided with a first sliding shoe, two first jacks located on both sides of the first sliding shoe, and the second jack and the first jack are kept synchronous lifting and lowering.

[0016] In some embodiments, when the sliding shoe on the B-type sliding beam is switched, the two second jacks are located outside two adjacent large nodes of the Warren truss; and the two first jacks are symmetrically arranged about the node of the Warren truss.

[0017] In some embodiments, when the sliding shoe on the A-type sliding beam is switched, the sliding shoe is switched to a second pushing mode in which the large nodes and the small nodes of the Warren truss are alternated.

[0018] In some embodiments, the sliding shoe on the A-type sliding beam is switched to a second pushing mode in which the large nodes and the small nodes of the Warren truss are alternated, including:

[0019] The first jack is lifted, and the Warren truss is converted from being supported by the sliding shoe to being supported by the jack.

[0020] The first sliding shoe is shifted from below a previous node of the Warren truss to below a subsequent node, and the sliding shoe switching is completed.

[0021] The first jack is lowered, and the Warren truss is converted from being supported by the jack to being supported by the sliding shoe.

[0022] In some embodiments, when the sliding shoe on the A-type sliding beam is switched, the two first jacks are located outside two adjacent nodes of the Warren truss; and the two second jacks are symmetrically arranged about the node of the Warren truss.

[0023] In some embodiments, when subjected to a vertical reaction force of the slipper below a set threshold, the slipper located on the B-type slide beam is switched to a second jacking mode, alternating between large and small nodes of the Warren truss.

[0024] In some embodiments, when the sliding shoe on the corresponding slide beam is switched, the lifting reaction force F of the corresponding jack... k The control condition is 0.6*Fh, which is the reaction force at the point where the previous state of the sliding shoe is mainly balanced on the slide beam, and the goal is for all sliding shoes to detach.

[0025] The beneficial effects of the technical solution provided in this application include:

[0026] This application provides a method for jacking construction of a Warren truss. The first support at the point of maximum jacking reaction is equipped with a B-type sliding beam with a length more than twice the module length. The length of the sliding beam of the jacking support is increased. When jacking an ultra-large span and bearing vertical reaction force of the sliding shoe exceeding a set threshold, the force characteristics of the large nodes of the Warren truss are utilized to ensure that the sliding shoe is supported at the large nodes of the Warren truss before and after the replacement. The small nodes of the Warren truss do not need to be reinforced, and the cross-sectional geometry of the Warren truss does not need to be increased, thus reducing the self-weight of the non-permanent structure. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the first pushing mode in one embodiment of the present invention.

[0029] Figure 2 for Figure 1 An enlarged view of part A in the first push-up mode shown.

[0030] Figure 3 for Figure 1 An enlarged view of part B in the first push-up pattern shown.

[0031] Figure 4 for Figure 1 The diagram shows the structural schematic of the sliding of the Chinese-style truss in the first jacking mode.

[0032] Figure 5 for Figure 4 An enlarged view of part C in the first push-up mode shown.

[0033] Figure 6 for Figure 4An enlarged view of part D in the first pushing mode shown.

[0034] Figure 7 A structural schematic view of the second pushing mode in an embodiment of the present application.

[0035] Figure 8 A structural schematic view of the second pushing mode in an embodiment of the present application. Figure 7 An enlarged view of part E in the second pushing mode shown.

[0036] Figure 9 An enlarged view of part F in the second pushing mode shown. Figure 7 An enlarged view of part F in the second pushing mode shown.

[0037] Reference signs:

[0038] 1, first support pier; 11, B-type sliding beam; 111, second sliding shoe; 112, second jack; 2, Warren truss; 21, large node; 22, small node; 3, second support pier; 31, A-type sliding beam; 311, first sliding shoe; 312, first jack. DETAILED DESCRIPTION

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described below in connection with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0040] The embodiments of the present application provide a pushing construction method for a Warren truss, which is suitable for a bridge engineering of a super-large pushing span construction using a Warren truss and a steel truss girder with a super-large sliding shoe vertical reaction force.

[0041] As shown in FIG. 1, the pushing construction method comprises the following steps. Figure 1 And Figure 2 As shown in FIG. 1, the pushing construction method comprises the following steps. Figure 1 A structural schematic view of the first pushing mode in an embodiment of the present application. Figure 2 An enlarged view of part A in the first pushing mode shown. Figure 1 An enlarged view of part A in the first pushing mode shown.

[0042] The pushing construction method comprises the following steps.

[0043] The first support pier 1 at the maximum pushing support reaction force is provided with a B-type sliding beam 11 with a length of 2 times or more than 2 times of a module; and the steel truss girder above the B-type sliding beam 11 is a Warren truss 2.

[0044] When the sliding shoe vertical reaction force exceeds a set threshold value, the sliding shoe located on the B-type sliding beam 11 is switched to the first pushing mode in which the front and rear sliding shoes are both located at the large node 21 position of the Warren truss 2.

[0045] The Warren truss 2 moves with the slipper to facilitate the jacking operation.

[0046] This application provides a method for jacking construction of a Warren truss. The first support at the point of maximum jacking reaction is equipped with a B-type sliding beam with a length more than twice the module length. The length of the sliding beam of the jacking support is increased. When jacking an ultra-large span and bearing vertical reaction force of the sliding shoe exceeding a set threshold, the force characteristics of the large nodes of the Warren truss are utilized to ensure that the sliding shoe is supported at the large nodes of the Warren truss before and after the replacement. The small nodes of the Warren truss do not need to be reinforced, and the cross-sectional geometry of the Warren truss does not need to be increased, thus reducing the self-weight of the non-permanent structure.

[0047] The first pier 1 is the temporary pier located in the waterway at the point of maximum jacking reaction; the remaining piers are the second pier 3 in general positions.

[0048] Based on the stress state analysis of the truss structure in the first completed bridge state and the staged stress calculation simulation analysis, the maximum reaction force of each pier during the jacking process is calculated, thereby determining the first pier 1 and the second pier 3.

[0049] like Figure 1 As shown, the maximum jacking span is 130m; the maximum vertical reaction force of the sliding shoe is 4200t, and the set threshold is 4000t. There is one first pier 1 and six second piers 3, distributed on both sides of the first pier 1.

[0050] The first pier 1 is equipped with a B-type sliding beam 11 with a length of twice the module. Of course, it is also possible to have a B-type sliding beam with a length of more than twice the module, depending on the actual construction situation.

[0051] The Warren truss 2, as a steel truss beam, is located above the B-type slide beam 11. The lower chord of the Warren truss 2 has two types of nodes: large node 21 and small node 22. The large node 21 can withstand large nodal reactions, while the small node 22 can only withstand smaller reactions.

[0052] like Figure 2 As shown, in some embodiments, the first jacking mode, in which the sliding shoe located on the B-type sliding beam 11 is replaced with a first jacking mode where both the front and rear are located at the large node 21 of the Warren truss 2, includes:

[0053] The B-type slide beam 11 is equipped with a second slide shoe 111 and two second jacks 112 located on both sides of the second slide shoe 111. The second slide shoe 111 is located below a large node 21 of the Warren truss 2.

[0054] The second jack 112 lifts the structure, and the Warren truss 2 is changed from slipper support to jack support;

[0055] The second shoe 111 is shifted from under the front large node 21 to under the rear large node 21 of the Warren truss 2, and the shoe switching is completed;

[0056] The second jack 112 is lowered, and the Warren truss 2 is converted from being supported by the jacks to being supported by the shoes.

[0057] As shown in FIG. 1, the Warren truss 2 is supported by the jacks. Figures 4 to 5 As shown in FIG. 1, the Warren truss 2 is supported by the jacks. Figure 4 As shown in FIG. 1, the Warren truss 2 is supported by the jacks. Figure 1 As shown in FIG. 1, the Warren truss 2 is supported by the jacks. Figure 5 As shown in FIG. 1, the Warren truss 2 is supported by the jacks. Figure 4 As shown in FIG. 1, the Warren truss 2 is supported by the jacks.

[0058] After the shoe switching on the B-type sliding beam 11, the Warren truss 2 is converted from being supported by the jacks to being supported by the shoes, and the Warren truss 2 moves with the shoes to perform the incremental launching construction.

[0059] Specifically, the Warren truss 2 slides forward with the second shoe 111 on the B-type sliding beam 11, and stops when the second shoe 111 moves to the front end of the sliding beam.

[0060] As shown in FIG. 1, the Warren truss 2 is supported by the jacks. Figure 3 As shown in FIG. 1, the Warren truss 2 is supported by the jacks. Figure 6 As shown in FIG. 1, the Warren truss 2 is supported by the jacks. Figure 3 As shown in FIG. 1, the Warren truss 2 is supported by the jacks. Figure 1 As shown in FIG. 1, the Warren truss 2 is supported by the jacks. Figure 6 As shown in FIG. 1, the Warren truss 2 is supported by the jacks. Figure 4 As shown in FIG. 1, the Warren truss 2 is supported by the jacks.

[0061] In some embodiments, the second piers 3 at other positions are provided with the A-type sliding beams 31 with a length of 1 times the module.

[0062] In some embodiments, the A-type sliding beam 31 is provided with the first shoe 311, two first jacks 312 located on both sides of the first shoe 311, and the second jacks 112 and the first jacks 312 are kept synchronous in lifting and lowering.

[0063] In some embodiments, when the shoe switching is performed on the B-type sliding beam 11, the two second jacks 112 are located outside two adjacent large nodes 21 of the Warren truss 2; and the two first jacks 312 are symmetrically arranged about the nodes of the Warren truss 2.

[0064] In some embodiments, when the vertical reaction force of the shoe is borne, the shoe switching on the A-type sliding beam 31 is switched to the second incremental launching mode in which the large nodes 21 and the small nodes 22 of the Warren truss 2 are alternated.

[0065] Since the A-type sliding beam 31 is not the maximum branch reaction force of the pushing, whether the sliding shoe vertical reaction force exceeds the set threshold or the sliding shoe vertical reaction force is lower than the set threshold, the sliding shoe inversion on the A-type sliding beam 31 is the second pushing mode of the large node 21 and the small node 22 of the Warren truss 2 alternately, which meets the pushing stress requirement and does not need to strengthen the vertical rod at the small node of the Warren truss, and is more economical and labor-saving.

[0066] As shown in Figures 7 to 9 , wherein, Figure 7 is a structural schematic diagram of the second pushing mode in an embodiment of the present application. Figure 8 is Figure 7 an enlarged view of the E part in the second pushing mode shown. Figure 9 is Figure 7 an enlarged view of the F part in the second pushing mode shown.

[0067] In some embodiments, the sliding shoe inversion on the A-type sliding beam 31 is the second pushing mode of the large node 21 and the small node 22 of the Warren truss 2 alternately, which includes:

[0068] The first jack 312 is lifted, and the Warren truss 2 is converted from sliding shoe support to jack support;

[0069] The first sliding shoe 311 is slid from below the previous large node 21 of the Warren truss 2 to below the next small node 22, completing the sliding shoe inversion;

[0070] The first jack 312 is lowered, and the Warren truss 2 is converted from jack support to sliding shoe support.

[0071] Of course, in other embodiments, when the first sliding shoe 311 performs sliding shoe inversion, it can also be slid from below the previous small node 22 of the Warren truss 2 to below the next large node 21.

[0072] After the sliding shoe inversion on the A-type sliding beam 31, the Warren truss 2 is converted from jack support to sliding shoe support, and the Warren truss 2 moves with the sliding shoe to perform pushing construction.

[0073] Specifically, the Warren truss 2 moves forward with the first sliding shoe 311 on the A-type sliding beam 31, and stops when the first sliding shoe 311 moves to the front end of the sliding beam.

[0074] In some embodiments, when the sliding shoe inversion on the A-type sliding beam 31, the two first jacks 312 are located outside two adjacent nodes of the Warren truss 2; and the two second jacks 112 are symmetrically arranged about the nodes of the Warren truss 2.

[0075] In some embodiments, when the vertical reaction force of the shoe is below the set threshold, the shoe on the B-type sliding beam 11 is switched to the second jacking mode in which the large nodes 21 and small nodes 22 of the Warren truss 2 are alternated.

[0076] When the vertical reaction force of the shoe is below the set threshold, the shoe on the B-type sliding beam 11 can be switched to the second jacking mode, which is designed according to actual needs.

[0077] In some embodiments, when the shoe on the corresponding sliding beam is switched, the jacking reaction force F k The control condition is the reaction force value 0.6*Fh of the shoe in the previous state on the sliding beam, and the target is that all shoes are detached.

[0078] The jacking construction process is as follows:

[0079] When the vertical reaction force of the shoe exceeds the set threshold, the shoe on the B-type sliding beam 11 is switched to the first jacking mode in which the large nodes 21 of the Warren truss 2 are located at the front and rear.

[0080] Specifically, the second jack 112 is jacked up, the Warren truss 2 is converted from being supported by the shoe to being supported by the jack; the second shoe 111 is moved from below the previous large node 21 of the Warren truss 2 to below the next large node 21, completing the shoe switching; the second jack 112 is lowered, and the Warren truss 2 is converted from being supported by the jack to being supported by the shoe.

[0081] The Warren truss 2 moves with the shoe.

[0082] Specifically, after the shoe on the B-type sliding beam 11 is switched, the Warren truss 2 moves forward with the second shoe 111 on the B-type sliding beam 11, and stops when the second shoe 111 moves to the front end of the sliding beam.

[0083] The shoe on the A-type sliding beam 31 is switched to the second jacking mode in which the large nodes 21 and small nodes 22 of the Warren truss 2 are alternated.

[0084] Specifically, the first jack 312 is jacked up, the Warren truss 2 is converted from being supported by the shoe to being supported by the jack; the first shoe 311 is moved from below the previous large node 21 of the Warren truss 2 to below the next small node 22, completing the shoe switching; the first jack 312 is lowered, and the Warren truss 2 is converted from being supported by the jack to being supported by the shoe.

[0085] The Warren truss 2 moves with the shoe.

[0086] Specifically, after the sliding shoe on the A-shaped sliding beam 31 is switched, the Warren truss 2 slides forward along the first sliding shoe 311 on the A-shaped sliding beam 31, and when the first sliding shoe 311 moves to the front end of the sliding beam, the Warren truss 2 stops.

[0087] The above state repeats and transforms, and finally the pushing and closing are completed.

[0088] In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the methods or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. Unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, "connection" can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0089] It should be noted that in the present application, relational terms such as "first" and "second" and the like are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the sentence "including a..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0090] The above is only a specific embodiment of the present application, which enables those skilled in the art to understand or implement the present application. Various modifications of these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features applied herein.

Claims

1. A method for incremental launching of a Warren truss, characterized in that, The incremental launching construction method comprises: The first supporting pier (1) at the maximum supporting reaction force of the incremental launching comprises a B-type launching beam (11) with a length of more than twice the module; When the vertical reaction force of the shoe exceeds the set threshold, the shoe on the B-type launching beam (11) is switched to the incremental launching mode in which the front and rear shoes are located at the large nodes (21) of the Warren truss (2); The Warren truss (2) moves with the shoe to perform the incremental launching construction; The shoe on the B-type launching beam (11) is switched to the incremental launching mode in which the front and rear shoes are located at the large nodes (21) of the Warren truss (2), and the B-type launching beam (11) comprises: The B-type launching beam (11) is provided with a second shoe (111) and two second jacks (112) located on both sides of the second shoe (111), and the second shoe (111) is located below one large node (21) of the Warren truss (2); The second jacks (112) are lifted, and the Warren truss (2) is switched from being supported by the shoe to being supported by the jacks; The second shoe (111) is moved from below the front large node (21) of the Warren truss (2) to below the rear large node (21), and the shoe switching is completed; The second jacks (112) are lowered, and the Warren truss (2) is switched from being supported by the jacks to being supported by the shoe; The second supporting pier (3) at other positions is provided with an A-type launching beam (31) with a length of one module; The A-type launching beam (31) is provided with a first shoe (311) and two first jacks (312) located on both sides of the first shoe (311), and the second jacks (112) and the first jacks (312) are kept synchronous lifting and lowering; When the vertical reaction force of the shoe is borne, the shoe on the A-type launching beam (31) is switched to the incremental launching mode in which the large nodes (21) and the small nodes (22) of the Warren truss (2) are alternately located.

2. A launching method for Warren truss as claimed in claim 1, wherein, When the shoe on the B-type launching beam (11) is switched, the two second jacks (112) are located outside two adjacent large nodes (21) of the Warren truss (2); and the two first jacks (312) are symmetrically arranged about the nodes of the Warren truss (2).

3. A launching method for Warren truss as claimed in claim 1, wherein, The shoe on the A-type launching beam (31) is switched to the incremental launching mode in which the large nodes (21) and the small nodes (22) of the Warren truss (2) are alternately located, and the first jacks (312) are lifted, and the Warren truss (2) is switched from being supported by the shoe to being supported by the jacks; The first shoe (311) is moved from below the front node of the Warren truss (2) to below the rear node, and the shoe switching is completed; The first jacks (312) are lowered, and the Warren truss (2) is switched from being supported by the jacks to being supported by the shoe. ​ 4. A push construction method for Warren truss as claimed in claim 3, wherein, When the sliding shoe on the A-type sliding beam (31) is switched, the two first jacks (312) are located outside two adjacent nodes of the Warren truss (2); the two second jacks (112) are symmetrically arranged about the nodes of the Warren truss (2).

5. A launching method for Warren truss as claimed in claim 1, wherein, When the vertical reaction force of the sliding shoe is lower than the set threshold, the sliding shoe on the B-type sliding beam (11) is switched to the pushing mode in which the large nodes (21) and the small nodes (22) of the Warren truss (2) are alternated.

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