Steel truss girder incremental launching construction method and device

Abstract

The invention relates to a steel truss girder incremental launching construction method and device, and belongs to the technical field of bridge erection. The steel truss girder incremental launching construction method comprises the steps that S1, sliding blocks are arranged on a slide way beam to support joints of a steel truss girder, and a walking top is arranged at the front end of a groove of the slide way beam; s2, the walking top is used for driving the steel truss girder and the sliding blocks to move on the sliding way beam till the sliding block at the front end moves to the position over a groove of the sliding way beam; s3, the front-end sliding block is detached and moved to the position of the next joint of the steel truss girder; and S4, the step S2 and the step S3 are repeated till the steel truss girder is moved to the preset position. According to the construction method, when the sliding block is inversely used, the walking top does not need to be repeatedly used for lifting and lowering the steel truss girder, the groove position is ingeniously used for suspending the sliding block, the disassembly and assembly space is provided for the sliding block, meanwhile, the walking top does not need to be installed at the two ends of the steel truss girder, only the walking top needs to be arranged at the front end of the groove, the construction cost and the construction difficulty are reduced, and the construction efficiency is improved. The construction efficiency can be greatly improved, and the construction period is shortened.

Description

Technical Field

[0001] The present application relates to the technical field of bridge erection, and in particular to a steel truss girder jacking construction method and device. Background Art

[0002] Since the chord of the steel truss is an axial load-bearing member with weak bending resistance, the steel truss can only withstand a large vertical support force at the node. Therefore, the drag-type jacking method is often used in the jacking construction of steel trusses. The drag-type jacking method has a sudden advance phenomenon when it is started, and the steel strands may collapse and easily injure people; and the steel beam can only be corrected laterally after each slide length. In the case of jacking construction of steel trusses with unequal inter-node distances, it is also necessary to constantly adjust the position of the slider and the jack so that the steel truss node falls on the slider, which is a cumbersome and inconvenient process.

[0003] In the related art, the patent with application number 202011566428.4 discloses a steel truss jacking construction method and device, which uses two walking tops to synchronously drive the steel truss and the slider to move on the slide beam, and lifts the steel truss through the two walking tops, moves the slider to the next node position, makes the slider support the steel truss alone, and retracts the walking top to perform the next stroke jacking; repeats the above steps to push the steel truss to the set position. This solves the problem that the walking top must be installed at the node position of the steel truss in the prior art, or other auxiliary devices are required to distribute the jacking force of the walking top to the node position of the steel truss.

[0004] However, both ends of the steel truss need to be arranged with walking tops. Each time the slider is moved to the next node position, two walking tops are needed to synchronously lift and lower the steel truss. In actual operation, the slider moving process is cumbersome, which is not conducive to improving construction efficiency. In addition, two walking tops need to be purchased for use, which increases the construction cost and construction difficulty. Therefore, it is necessary to study and improve the above structure and provide a steel truss top pushing construction method and device in order to achieve a more practical purpose. Summary of the invention

[0005] The embodiment of the present application provides a steel truss jacking construction method and device to solve the problem in the related art that each time a slider is moved to the next node position during the steel truss jacking construction, two walking jacks are needed to synchronously lift and lower the steel truss, and the actual operation is cumbersome in the slider moving process, which is not conducive to improving the construction efficiency, and two walking jacks need to be purchased for use together, which increases the construction cost and construction difficulty.

[0006] In a first aspect, an embodiment of the present application provides a steel truss girder top-pushing construction method, the method comprising:

[0007] S1: Arrange the sliders on the slideway beam to support the nodes of the steel truss beam, and arrange the walking top at the front end of the groove of the slideway beam;

[0008] S2: Using the walking top to drive the steel truss beam and the slider to move on the slide beam until the front slider moves to the top of the groove of the slide beam;

[0009] S3: Remove the front end slider and move it to the next node position of the steel truss;

[0010] S4: Repeat steps S2 and S3 until the steel truss is moved to a preset position.

[0011] In the first aspect, in some embodiments, step S2 specifically includes:

[0012] S21: applying a preset vertical force to the steel truss by using the vertical jack of the walking top, so that the walking top and the slider jointly support the steel truss;

[0013] S22: using the horizontal jack of the walking top to apply a preset horizontal force to the steel truss beam, so that the steel truss beam and the slider move on the slideway beam by a horizontal jack stroke;

[0014] S23: the vertical jack is retracted, so that the slider supports the steel truss alone, and the horizontal jack drives the vertical jack to return to the starting position;

[0015] S24: Repeat steps S21, S22 and S23 until the front end slider is moved to the position directly above the groove of the slideway beam.

[0016] On the first aspect, in some embodiments, the preset horizontal force H satisfies H>μ1F and H<μ2P, wherein μ1 is the friction coefficient between the slider and the walking top and the slideway beam, μ2 is the friction coefficient between the lower chord of the steel truss and the walking top, F is the supporting force when the slider supports the steel truss alone, and P is the preset vertical force.

[0017] In the first aspect, in some embodiments, the relationship between μ1 and μ2 is

[0018] In a first aspect, in some embodiments, the preset vertical force applied by the walking top to the steel truss is determined according to the allowable bending bearing capacity of the lower chord of the steel truss.

[0019] In a first aspect, in some embodiments, the steel truss is detachably connected to the slider so that the slider can be removed and moved to the next node position of the steel truss.

[0020] In a second aspect, an embodiment of the present application provides a steel truss girder top-pushing construction device, which is used to implement any of the above-mentioned steel truss girder top-pushing construction methods, and the device includes:

[0021] a slide beam with a groove at the front end;

[0022] At least one walking top, which is arranged at the front end of the groove of the slideway beam and is used to provide a preset vertical force to support the steel truss beam and / or output a preset horizontal force to push the steel truss beam;

[0023] A sliding block is arranged at a node of the steel truss and is used to support the steel truss alone or together with the walking top.

[0024] On the second aspect, in some embodiments, the walking top includes a horizontal jack and a vertical jack, the vertical jack is used to provide a preset vertical force, and the horizontal jack is used to output a preset horizontal force.

[0025] In a second aspect, in some embodiments, the slider is detachably connected to the steel truss.

[0026] In a second aspect, some embodiments further include a pad block, which is arranged on the vertical jack of the walking top.

[0027] The beneficial effects of the technical solution provided by this application include:

[0028] The embodiment of the present application provides a method and device for jacking construction of a steel truss, the method comprising: S1: arranging a slider on a slide beam to support the node of the steel truss, and arranging a walking top at the front end of the groove of the slide beam; S2: using the walking top to drive the steel truss and the slider to move on the slide beam until the front end slider moves to just above the groove of the slide beam; S3: disassembling the front end slider and moving it to the next node position of the steel truss; S4: repeating steps S2 and S3 until the steel truss is moved to a preset position.

[0029] Therefore, a walking top can be used to drive the slider and the steel truss to move on the slide beam. When the front end slider moves to the top of the slide beam groove, the front end slider can be directly removed and moved to the next node position of the steel truss. When the slider is actually used, there is no need to repeatedly use the walking top to lift and lower the steel truss. The groove position is cleverly used to suspend the slider to provide space for disassembly and assembly of the slider. At the same time, there is no need to install walking tops at both ends of the steel truss. Only the walking top needs to be arranged at the front end of the groove, which reduces the construction cost and difficulty, can greatly improve the construction efficiency, and shorten the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 This is a flow chart of the steel truss jacking construction method of an embodiment of the present application;

[0032] Figure 2 A schematic diagram of step S1 of an embodiment of the present application;

[0033] Figure 3 This is a schematic diagram of the sliding block and the walking top jointly supporting the steel truss beam in step S2 of the embodiment of the present application;

[0034] Figure 4 This is a schematic diagram of the slider moving to the top of the groove in step S2 of the embodiment of the present application;

[0035] Figure 5 This is a schematic diagram of the slider moving to the next node in step S3 of an embodiment of the present application.

[0036] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0037] 1. Steel truss; 2. Slider; 3. Slide beam; 4. Walking top; 5. Pad; 6. Pier. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0039] The embodiment of the present application provides a steel truss jacking construction method and device to solve the problem in the related art that each time a slider is moved to the next node position during the steel truss jacking construction, two walking jacks are needed to synchronously lift and lower the steel truss, and the actual operation is cumbersome in the slider moving process, which is not conducive to improving the construction efficiency, and two walking jacks need to be purchased for use together, which increases the construction cost and construction difficulty.

[0040] See also Figures 1 to 5 As shown, the first aspect of the embodiment of the present application provides a steel truss girder top-pushing construction method, the method comprising:

[0041] S1: Arrange the slider 2 on the slide beam 3 to support the node of the steel truss 1, and arrange the walking top 4 at the front end of the groove of the slide beam 3;

[0042] S2: Use the walking top 4 to drive the steel truss beam 1 and the slider 2 to move on the slide beam 3 until the front slider 2 moves to the top of the groove of the slide beam 3;

[0043] S3: dismantle the front end slider 2 and move it to the next node position of the steel truss 1;

[0044] S4: Repeat steps S2 and S3 until the steel truss beam 1 is moved to a preset position.

[0045] A groove is provided on the slide beam 3 of the steel truss beam pushing construction method of the embodiment of the present application, and a slider 2 and a step top 4 are respectively arranged at both ends of the groove. The slider 2 can support the steel truss beam 1 alone, or the slider 2 and the step top 4 can support the steel truss beam 1 together.

[0046] Exemplarily, the walking top 4 is arranged at the front end of the groove of the slide beam 3 in the direction in which the steel truss 1 needs to move, and the slider 2 is arranged at the other end of the groove and fixed at the node position of the steel truss 1 by bolts. After the walking top 4 applies a preset vertical force to the steel truss 1 and then outputs a preset horizontal force, the slider 2 and the steel truss 1 can be moved on the slide beam 3.

[0047] Therefore, during actual construction, a walking top 4 can be used to drive the slider 2 and the steel truss 1 to move on the slide beam 3. When the front slider 2 moves to the top of the groove of the slide beam 3, the front slider 2 can be directly disassembled and moved to the next node position of the steel truss 1.

[0048] When the slider 2 is used in reverse, there is no need to repeatedly use the walking top 4 to lift and lower the steel truss 1. The slider 2 is suspended in the groove position by cleverly utilizing the walking top 4 to provide space for disassembly and assembly of the slider 2. At the same time, there is no need to install the walking top 4 at both ends of the steel truss 1. Only the walking top 4 needs to be arranged at the front end of the groove, which reduces the construction cost and construction difficulty, can greatly improve the construction efficiency, and shorten the construction period.

[0049] It should be noted that the slider 2 can be connected to the node of the steel truss 1 by bolts, and can be applied to the steel truss 1 with any node spacing. There is no need to adjust the position of the slider 2 and the step top 4 on the slide beam 3, which optimizes the construction process and shortens the construction period.

[0050] In some optional embodiments, see Figures 1 to 5 As shown, the embodiment of the present application provides a steel truss beam top-pushing construction method, and step S2 of the steel truss beam top-pushing construction method specifically includes:

[0051] S21: using the vertical jack of the walking top 4 to apply a preset vertical force to the steel truss 1, so that the walking top 4 and the slider 2 jointly support the steel truss 1;

[0052] S22: using the horizontal jack of the walking top 4 to apply a preset horizontal force to the steel truss beam 1, so that the steel truss beam 1 and the slider 2 move on the slideway beam 3 by a horizontal jack stroke;

[0053] S23: The vertical jack is retracted, so that the slider 2 supports the steel truss 1 alone, and the horizontal jack drives the vertical jack to return to the starting position;

[0054] S24: Repeat steps S21, S22 and S23 until the front end slider 2 moves to just above the groove of the slideway beam 3.

[0055] The embodiment of the present application applies a preset vertical force to the steel truss 1 through the walking jack 4 and then outputs a preset horizontal force, so that the slider 2 and the steel truss 1 can be moved on the slide beam 3. By retracting the vertical jack, the slider 2 can support the steel truss 1 alone, and the horizontal jack is used to drive the vertical jack to return to the starting position, and then the next push can be prepared. The action of moving the steel truss 1 is repeated until the front slider 2 moves to the top of the groove of the slide beam 3, and the slider 2 can be disassembled using the space provided by the groove.

[0056] In this embodiment, when the steel truss beam 1 deviates during the displacement process, the position of the steel truss beam 1 can be adjusted by the transverse horizontal jack of the walking top 4 to achieve timely correction.

[0057] In some optional embodiments, see Figures 1 to 5 As shown, the embodiment of the present application provides a steel truss girder top-pushing construction method, in which the preset horizontal force H in step S22 of the steel truss girder top-pushing construction method satisfies H>μ1f, and H<μ2P;

[0058] The relationship between μ1 and μ2 is

[0059] Among them, μ1 is the friction coefficient between the slider 2 and the walking top 4 and the slide beam 3, μ2 is the friction coefficient between the lower chord of the steel truss 1 and the walking top 4, F is the supporting force when the slider 2 supports the steel truss 1 alone, and P is the preset vertical force.

[0060] The preset horizontal force H in the embodiment of the present application satisfies H>μ1F and H<μ2P. When the walking top 4 is in motion, the moving slider 2 and the steel truss 1 can be pushed by the walking top 4, so that the walking top 4 does not need to be installed at the node position of the steel truss 1, and no other auxiliary devices are needed to distribute the pushing force of the walking top 4 to the node position of the steel truss 1. Compared with the construction method using steel strand pulling, it also solves the problem of sudden advance during the steel beam pushing process.

[0061] In some alternative embodiments: See Figures 1 to 5 As shown, an embodiment of the present application provides a steel truss jacking construction method, in which step S22 of the steel truss jacking construction method determines the preset vertical force applied by the stepping top 4 to the steel truss 1 according to the allowable bending bearing capacity of the lower chord of the steel truss 1.

[0062] The preset vertical force applied by the walking top 4 to the steel truss 1 of the embodiment of the present application is within the allowable bending bearing capacity of the lower chord of the steel truss 1, which can fully exert the bending bearing capacity of the lower chord of the truss while ensuring the safety of the steel truss 1.

[0063] Therefore, the walking top 4 does not need to be installed at the node position of the steel truss 1, and no other auxiliary devices are needed to distribute the pushing force of the walking top 4 to the node positions of the steel truss 1, breaking through the limitation that the steel truss 1 must be subjected to force at the node during the pushing of the walking top 4.

[0064] In some alternative embodiments: See Figures 1 to 5 As shown, an embodiment of the present application provides a steel truss girder jacking construction method, in which the steel truss girder 1 and the slider 2 are connected in a detachable manner so that the slider 2 can be disassembled and moved to the next node position of the steel truss girder 1.

[0065] The steel truss 1 and the slider 2 of the embodiment of the present application are detachably connected, so that the slider 2 can be removed and used in the next node position of the steel truss 1. Exemplarily, the steel truss 1 and the slider 2 are connected by bolts.

[0066] See also Figures 1 to 5 As shown, the second aspect of the embodiment of the present application provides a steel truss beam jacking construction device, comprising:

[0067] The method for implementing the steel truss top-pushing construction of any one of the above embodiments comprises:

[0068] A slide beam 3 with a groove at the front end;

[0069] At least one walking top 4, which is arranged at the front end of the groove of the slideway beam 3, and is used to provide a preset vertical force to support the steel truss beam 1 and / or output a preset horizontal force to push the steel truss beam 1;

[0070] The sliding block 2 is arranged at the node of the steel truss 1 and is used to support the steel truss 1 alone or together with the walking top 4.

[0071] The steel truss jacking construction device of the embodiment of the present application applies a preset vertical force to the steel truss 1 through the walking jack 4 and then outputs a preset horizontal force, so that the slider 2 and the steel truss 1 can move on the slideway beam 3, and then the slider 2 supports the steel truss 1 alone by retracting the vertical jack, and the horizontal jack is used to drive the vertical jack to return to the starting position, so as to prepare for the next stroke of jacking.

[0072] Repeat the action of moving the steel truss beam 1 until the front end slider 2 is moved to the top of the groove of the slide beam 3, use the space provided by the groove to remove the front end slider 2, and move the front end slider 2 to the next node position of the steel truss beam 1; repeat the above steps to move the steel truss beam 1 to the preset position.

[0073] The preset vertical force applied by the walking top 4 to the steel truss 1 is within the allowable bending bearing capacity of the lower chord of the steel truss 1. Under the premise of ensuring the safety of the steel truss 1, the bending bearing capacity of the lower chord of the truss is fully utilized, breaking through the limitation that the steel truss 1 must be subjected to force at the node when the walking top 4 is pushed.

[0074] In addition, during implementation, a plurality of grooves can be provided on the slide beam 3, and a step top 4 is provided corresponding to each groove under the steel truss 1, which work together to fully exert the bending bearing capacity of the lower chord of the truss while ensuring the safety of the steel truss 1, so as to avoid damage to the structure of the steel truss 1 during the pushing process.

[0075] In the second aspect, in some optional embodiments: see Figures 1 to 5 As shown, an embodiment of the present application provides a steel truss jacking construction device, wherein the walking top 4 of the steel truss jacking construction device includes a horizontal jack and a vertical jack, the vertical jack is used to provide a preset vertical force, and the horizontal jack is used to output a preset horizontal force.

[0076] The walking top 4 of the embodiment of the present application includes a vertical jack for providing a preset vertical force, and a horizontal jack for outputting a preset horizontal force. After the preset vertical force is applied to the steel truss 1 by the vertical jack, and then the preset horizontal force is output by the horizontal jack, the horizontal jack can be used to drive the slider 2 and the steel truss 1 to move on the slide beam 3.

[0077] In the second aspect, in some optional embodiments: see Figures 1 to 5 As shown, an embodiment of the present application provides a steel truss girder pushing construction device, in which a slider 2 is detachably connected to a steel truss girder 1 .

[0078] The steel truss 1 and the slider 2 of the embodiment of the present application are detachably connected, so that the slider 2 can be removed and used in the next node position of the steel truss 1. Exemplarily, the steel truss 1 and the slider 2 are connected by bolts.

[0079] In the second aspect, in some optional embodiments: see Figures 1 to 5 As shown, an embodiment of the present application provides a steel truss girder jacking construction device, which also includes a cushion block 5, which is arranged on the vertical jack of the walking top 4.

[0080] The vertical jack of the walking top 4 in the embodiment of the present application is equipped with a pad 5, which can protect the steel truss 1 and prevent stress concentration from damaging the surface of the steel truss 1. At the same time, the pad 5 can increase the supporting height of the vertical jack and prevent the vertical jack from having insufficient supporting height.

[0081] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application 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, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0082] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0083] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to 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 the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A steel truss girder top-pushing construction method, characterized in that the method include: S1: Arrange a slider (2) on the slideway beam (3) to support the node of the steel truss beam (1), and arrange a walking top (4) at the front end of the groove of the slideway beam (3); S2: using the walking top (4) to drive the steel truss beam (1) and the slider (2) to move on the slideway beam (3) until the front slider (2) moves to the position just above the groove of the slideway beam (3); S3: dismantle the front end slider (2) and move it to the next node position of the steel truss (1); S4: Repeat steps S2 and S3 until the steel truss (1) is moved to a preset position.

2. The steel truss girder top-pushing construction method according to claim 1, characterized in that: The step S2 specifically includes: S21: using the vertical jack of the walking top (4) to apply a preset vertical force to the steel truss (1), so that the walking top (4) and the sliding block (2) jointly support the steel truss (1); S22: using the horizontal jack of the walking top (4) to apply a preset horizontal force to the steel truss (1), so that the steel truss (1) and the sliding block (2) move on the slideway beam (3) by a horizontal jack stroke; S23: the vertical jack is retracted, so that the slider (2) supports the steel truss (1) alone, and the horizontal jack drives the vertical jack to return to the starting position; S24: Repeat steps S21, S22 and S23 until the front end slider (2) is moved to the position directly above the groove of the slideway beam (3).

3. The steel truss girder top-pushing construction method according to claim 2, characterized in that: The preset horizontal force H satisfies H>μ1F and H<μ2P, wherein μ1 is the friction coefficient between the slider (2) and the walking top (4) and the slideway beam (3), μ2 is the friction coefficient between the lower chord of the steel truss (1) and the walking top (4), F is the supporting force when the slider (2) supports the steel truss (1) alone, and P is the preset vertical force.

4. The steel truss girder top-pushing construction method according to claim 3, characterized in that: The relationship between μ1 and μ2 is 5. The steel truss girder top-pushing construction method according to claim 2, characterized in that: The preset vertical force applied by the walking top (4) to the steel truss (1) is determined according to the allowable bending bearing capacity of the lower chord of the steel truss (1).

6. The steel truss girder top-pushing construction method according to claim 1, characterized in that: The steel truss (1) and the slider (2) are connected in a detachable manner so that the slider (2) can be removed and moved to the next node position of the steel truss (1).

7. A steel truss girder top-pushing construction device, used to implement the steel truss girder top-pushing construction method according to any one of claims 1 to 6, characterized in that: include: A slideway beam (3) with a groove at the front end; At least one walking top (4), which is arranged at the front end of the groove of the slideway beam (3) and is used to provide a preset vertical force to support the steel truss beam (1) and / or output a preset horizontal force to push the steel truss beam (1); A sliding block (2) is arranged at a node of the steel truss (1) and is used to support the steel truss (1) alone or together with the walking top (4).

8. The steel truss girder top-pushing construction device according to claim 7, characterized in that: The walking top (4) comprises a horizontal jack and a vertical jack, wherein the vertical jack is used to provide a preset vertical force, and the horizontal jack is used to output a preset horizontal force.

9. The steel truss girder top-pushing construction device according to claim 7, characterized in that: The sliding block (2) is detachably connected to the steel truss (1).

10. The steel truss girder top-pushing construction device according to claim 7, characterized in that: It also includes a cushion block (5) which is arranged on the vertical jack of the walking top (4).

Images