CN112726427A - Steel truss pushing construction method and device - Google Patents
Steel truss pushing construction method and device Download PDFInfo
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- CN112726427A CN112726427A CN202011566428.4A CN202011566428A CN112726427A CN 112726427 A CN112726427 A CN 112726427A CN 202011566428 A CN202011566428 A CN 202011566428A CN 112726427 A CN112726427 A CN 112726427A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 167
- 239000010959 steel Substances 0.000 title claims abstract description 167
- 238000010276 construction Methods 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 17
- 238000005452 bending Methods 0.000 claims description 12
- 125000006850 spacer group Chemical group 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
- E01D21/06—Methods or apparatus specially adapted for erecting or assembling bridges by translational movement of the bridge or bridge sections
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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Abstract
The invention relates to the technical field of bridge erection, in particular to a steel truss pushing construction method and a device, and the method comprises the following steps: s1: arranging a sliding block on a slideway beam to support a node of a steel truss beam, and arranging walking tops at two ends of the slideway beam respectively; s2: the two walking tops apply preset vertical force to the steel truss girder and then output preset horizontal force, so that the sliding block and the steel truss girder move for a preset distance on the slideway girder; s3: jacking the steel truss beams by using the two walking jacks, moving the sliding blocks to the next node position, and withdrawing the walking jacks to enable the sliding blocks to independently support the steel truss beams; s4: and repeating the steps S2 and S3 until the steel truss beam is moved to the preset position. The technical scheme can solve the problem that the walking top in the prior art needs to be installed at the node position of the steel truss girder or other auxiliary devices are needed to distribute the top thrust of the walking top to the node position of the steel truss girder.
Description
Technical Field
The invention relates to the technical field of bridge erection, in particular to a steel truss pushing construction method and a steel truss pushing construction device.
Background
Because the steel truss chord member is an axial stress component, the bending resistance is weaker, and the steel truss can only bear larger vertical supporting force at the node. Therefore, at present, the steel truss girder pushing construction usually adopts a dragging type pushing method, and rarely adopts a walking type pushing method of non-node support.
The dragging type pushing is that the slide ways, the slide blocks, the horizontal jacks and the like are arranged on the buttress, the slide blocks act on the steel truss girder nodes after the steel girders are assembled, the weight of the steel girders is born by the slide blocks on each slide way, and the slide blocks are connected with the jacks through steel strands. The steel strand is pulled by a horizontal jack, so that the frictional resistance between the sliding block and the slideway is overcome, and the steel beam is pulled forward.
In the mode, the steel beam is pushed to start, so that the steel strand is easy to break out and hurt people; and after the length of each sliding way is traveled, the steel beam can be transversely corrected.
In addition, in the existing walking pushing mode, the walking top needs to be installed at the node position of the steel truss girder, the operation process is complex, or other auxiliary devices are needed to distribute the pushing force of the walking top to the node position of the steel truss girder, and the structure is complex.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a steel truss girder pushing construction method and a steel truss girder pushing construction device, which can solve the problem that in the prior art, a walking top needs to be installed at the node position of a steel truss girder, or other auxiliary devices are needed to distribute the pushing force of the walking top to the node position of the steel truss girder.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
on one hand, the invention provides a steel truss girder pushing construction method, which comprises the following steps:
s1: arranging a sliding block on a slideway beam to support a node of a steel truss beam, and arranging walking tops at two ends of the slideway beam respectively;
s2: the two walking tops apply preset vertical force to the steel truss girder and then output preset horizontal force, so that the sliding block and the steel truss girder move for a preset distance on the slideway girder;
s3: jacking the steel truss beams by using the two walking jacks, moving the sliding blocks to the next node position, and withdrawing the walking jacks to enable the sliding blocks to independently support the steel truss beams;
s4: and repeating the steps S2 and S3 until the steel truss beam is moved to the preset position.
In some optional embodiments, the step S2 specifically includes:
s21: exerting preset vertical force on the steel truss girder by using the vertical jacks of the two walking jacks to enable the walking jacks and the sliding block to jointly support the steel truss girder;
s22: applying a preset horizontal force to the steel truss girder by using the horizontal jacks of the two walking jacks to enable the sliding block and the steel truss girder to move for a horizontal jack stroke on the slideway girder;
s23: withdrawing the vertical jack to enable the sliding block to independently support the steel truss girder, and enabling the horizontal jack to drive the vertical jack to return to the initial position;
s24: repeating steps S21, S22, and S23 until the slider and the steel girder are moved on the girder by a preset distance.
In some optional embodiments, the preset distance is a distance at which at least the next node passes over the top of the walking track behind the moving direction of the steel truss girder and the slide block does not pass over the top of the walking track in front of the moving direction.
In some alternative embodiments, the predetermined horizontal force H satisfies H > 0.5 μ1F, and H < mu2P1Wherein, mu2Is the friction coefficient mu between the lower chord of the steel truss girder and the walking top1The friction coefficient between the sliding block and the walking top and the slideway beam is F, the sliding block is independently supportedSupporting force in steel truss girder, P1A preset vertical force.
In some alternative embodiments, the μ1And mu2In a relationship of
In some alternative embodiments, the slider is pulled to the next node position using a steel strand in step S3.
In some optional embodiments, the preset vertical force applied to the steel truss beam by the walking top is determined according to the bending resistance bearing capacity allowed by the lower chord of the steel truss beam.
On the other hand, the invention provides a steel truss pushing construction device, which comprises:
a slideway beam;
the two sets of walking jacks are respectively arranged at two ends of the slideway beam and are used for providing a preset vertical force to support the steel truss beam and/or outputting a preset horizontal force to push the steel truss beam;
and the sliding blocks are arranged on the slideway beams, positioned between the two sets of walking tops and used for supporting the steel truss beams independently or together with the walking tops.
In some optional embodiments, the walking jack comprises a horizontal jack and a vertical jack, the vertical jack is used for providing a preset vertical force, and the horizontal jack is used for outputting a preset horizontal force.
In some optional embodiments, the walking device further comprises a cushion block arranged on the vertical jack of the walking top.
Compared with the prior art, the invention has the advantages that: applying a preset vertical force to the steel truss girder by utilizing the two walking tops, and then outputting a preset horizontal force to enable the sliding block and the steel truss girder to move on the slideway girder by a preset distance; jacking the steel truss girder by using the two walking jacks, moving the sliding block to the next node position, enabling the sliding block to independently support the steel truss girder, and withdrawing the walking jack to perform jacking of the next stroke; and repeating the steps to push the steel truss girder to a set position. According to the method, the preset vertical force applied to the steel truss by the walking top is within the bending resistance bearing capacity allowed by the lower chord of the steel truss, so that the bending resistance bearing capacity of the lower chord of the truss is fully exerted on the premise of ensuring the safety of the steel truss, the walking top does not need to be installed at the node position of the steel truss, other auxiliary devices are not needed for distributing the pushing force of the walking top to the node position of the steel truss, and the limitation that the node is stressed in the walking top pushing of the steel truss is broken through.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of a steel truss incremental launching construction method in an embodiment of the invention;
FIG. 2 is a diagram illustrating step S1 according to an embodiment of the present invention;
FIG. 3 is a schematic view of the steel truss supported by the sliding blocks and the top of the walking track in step S2 according to the embodiment of the present invention;
FIG. 4 is a schematic view illustrating the steel girder moved by a predetermined distance in step S2 according to an embodiment of the present invention;
fig. 5 is a schematic diagram illustrating the slider moving to the next node in step S3 according to the embodiment of the present invention.
In the figure: 1. a steel truss beam; 2. a slider; 3. a slideway beam; 4. step top; 5. cushion blocks; 6. a buttress.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. As shown in fig. 1, the invention provides a steel truss girder incremental launching construction method, which comprises the following steps:
as shown in fig. 2, S1: the sliding blocks 2 are arranged on the slideway beams 3 to support the joints of the steel trussed beams 1, and the two ends of the slideway beams 3 are respectively provided with a walking top 4.
In the embodiment, the slideway beam 3 is arranged on the buttress 6, and the sliding blocks 2 are arranged at the nodes of the corresponding steel trussed beams according to the pushing span of the steel trussed beams 1. The weight of the steel truss girder 1 is borne by all the sliding blocks 2, and the supporting force at each sliding block 2 is set to be F.
As shown in fig. 3 and 4, S2: the two walking tops 4 are used for applying a preset vertical force to the steel truss girder 1 and then outputting a preset horizontal force, so that the sliding block 2 and the steel truss girder 1 move on the slideway girder 3 for a preset distance.
In some optional embodiments, the step S2 specifically includes:
s21: and a preset vertical force is applied to the steel truss girder 1 by using the vertical jacks of the two walking roofs 4, so that the walking roofs 4 and the sliding blocks 2 support the steel truss girder 1 together.
Preferably, the preset vertical force applied by the walking top 4 to the steel truss girder 1 is determined according to the bending-resistant bearing capacity allowed by the lower chord of the steel truss girder 1. In this embodiment, the preset vertical force applied to the steel truss girder 1 by the walking top 4 is within the bending-resistant bearing capacity allowed by the lower chord of the steel truss girder 1, so that the pressure of the steel truss girder 1 on the sliding block 2 is reduced on the premise of ensuring the safety of the steel truss girder 1.
S22: the horizontal jacks of the two walking jacks 4 are utilized to apply preset horizontal force to the steel truss girder 1, so that the sliding block 2 and the steel truss girder 1 move on the slideway girder 3 for a horizontal jack stroke.
Preferably, the predetermined horizontal force H satisfies H > 0.5 μ1F, and H < mu2P1Wherein, mu2Is the friction coefficient mu between the lower chord of the steel truss girder and the walking top1The coefficient of friction resistance between the sliding block and the walking top and the slideway beam, F is the supporting force when the sliding block supports the steel truss beam independently, P1A preset vertical force.
Preferably, mu1And mu2In a relationship of
In the present embodiment, the predetermined horizontal force H satisfies H > 0.5. mu.1F, and H < mu2P1，
In the process, the walking top can just push the movable sliding block 2 and the steel truss girder 1, so that the walking top does not need to be arranged at the node position of the steel truss girder 1, and other auxiliary devices are not needed to distribute the pushing force of the walking top to the node position of the steel truss girder 1. Compared with a construction method adopting steel strand pulling, the construction method also solves the problem of outburst in the pushing process of the steel beam.
S23: the vertical jack is retracted, the sliding block 2 is enabled to independently support the steel truss girder 1, and the horizontal jack drives the vertical jack to return to the initial position. Namely, the vertical jack of the walking jack 4 releases force, so that the steel truss girder 1 falls back to the sliding block 2, and the sliding block 2 singly supports the steel truss girder 1. At the moment, the vertical jack of the walking jack 4 is not stressed, and the horizontal jack of the walking jack 4 returns to the initial position by returning, so that the walking jack 4 is prepared for pushing in the next stroke.
S24: the steps S21, S22, and S23 are repeated until the slider 2 and the steel girder 1 are moved on the girder 3 by a preset distance.
Preferably, the preset distance is a distance at least enabling the next node to cross the walking top 4 behind the moving direction of the steel truss girder 1 and not cross the walking top 4 in front of the moving direction. Therefore, the sliding block 2 can jack up the whole steel truss girder 1 by the walking top 4 again, the position of the sliding block 2 is adjusted, and the jacking of the next steel truss girder 1 for a preset distance is continued.
As shown in fig. 5, S3: and (3) jacking the steel truss girder 1 by using the two walking roofs 4, moving the sliding block 2 to the next node position, and withdrawing the walking roof 4 to enable the sliding block 2 to independently support the steel truss girder 1.
Preferably, the slider 2 is pulled to the next nodal position by means of a steel strand. In this example, the steel strand is adopted to drag the sliding block 2 to the next node position, so that the sliding block 2 can be quickly pulled to the next node of the steel truss girder 1 to prepare for pushing at the next preset distance.
S4: and repeating the steps S2 and S3 until the steel girder 1 is moved to a preset position.
In this embodiment, the steel truss girder 1 is deviated during the displacement process, and the position of the steel truss girder 1 can be adjusted by the horizontal jack of the walking shoe top 4 to correct the deviation in time.
In conclusion, by using the steel truss girder pushing construction method, the sliding blocks 2 are arranged on the slideway girder 3 to support the nodes of the steel truss girder 1, and the two ends of the slideway girder 3 are respectively provided with the walking tops 4; a preset vertical force is applied to the steel truss girder 1 by the two walking jacks 4, and then a preset horizontal force is output, so that the sliding block 2 and the steel truss girder 1 move on the slideway girder 3 for a preset distance; jacking the steel truss girder 1 by using the two walking roofs 4, moving the sliding block 2 to the next node position, and withdrawing the walking roof 4 to enable the sliding block 2 to independently support the steel truss girder 1; and repeating the steps to push the steel truss girder 1 to a set position. The preset vertical force applied to the steel truss girder 1 by the walking top 4 is within the bending-resistant bearing capacity allowed by the lower chord of the steel truss girder 1, so that the bending-resistant bearing capacity of the lower chord of the truss girder can be fully exerted on the premise of ensuring the safety of the steel truss girder 1, and the limitation that the steel truss girder must be stressed at the node in the walking top is broken through.
The invention also provides a pushing construction device for the steel truss girder, which comprises: a slideway beam 3, two sets of walking tops 4 and a sliding block 2.
The two sets of walking beam jacks 4 are respectively arranged at two ends of the slideway beam 3 and are used for providing a preset vertical force to support the steel truss beam 1 and/or outputting a preset horizontal force to push the steel truss beam 1; the sliding block 2 is arranged on the slideway beam 3 and positioned between the two sets of walking tops 4 and is used for supporting the steel truss beam 1 independently or together with the walking tops 4.
In some alternative embodiments, the walking jack 4 comprises a horizontal jack and a vertical jack, the vertical jack is used for providing a preset vertical force, and the horizontal jack is used for outputting a preset horizontal force.
In some alternative embodiments, a pad 5 is also included, which is provided on the vertical jack of the walking top 4.
In the embodiment, a preset vertical force is applied to the steel truss girder 1 through the two walking roofs 4, and then a preset horizontal force is output, so that the sliding block 2 and the steel truss girder 1 move on the slideway girder 3 for a preset distance; the two walking tops 4 are used for jacking and supporting the steel truss girder 1, the sliding block 2 is moved to the next node position, and the walking tops 4 are retracted at the moment, so that the sliding block 2 singly supports the steel truss girder 1; and repeating the steps to push the steel truss girder 1 to a set position. The preset vertical force applied to the steel truss girder 1 by the walking top 4 is within the bending-resistant bearing capacity allowed by the lower chord of the steel truss girder 1, so that the bending-resistant bearing capacity of the lower chord of the truss girder can be fully exerted on the premise of ensuring the safety of the steel truss girder 1, and the limitation that the steel truss girder must be stressed at the node in the walking top is broken through.
In addition, when the method is implemented, a plurality of steel truss girder pushing construction devices can be arranged below the steel truss girders at intervals and used for combined action, so that the bending resistance bearing capacity of the lower chord of the truss is fully exerted on the premise of ensuring the safety of the steel truss girder 1, and the structure of the steel truss girder is prevented from being damaged in the pushing process.
In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A steel truss beam pushing construction method is characterized by comprising the following steps:
s1: a sliding block (2) is arranged on the slideway beam (3) to support a node of the steel truss beam (1), and walking tops (4) are respectively arranged at two ends of the slideway beam (3);
s2: the two walking tops (4) apply preset vertical force to the steel truss girder (1) and then output preset horizontal force, so that the sliding block (2) and the steel truss girder (1) move on the slideway girder (3) for a preset distance;
s3: jacking the steel truss girder (1) by using the two walking tops (4), moving the sliding block (2) to the next node position, and withdrawing the walking tops (4) to enable the sliding block (2) to independently support the steel truss girder (1);
s4: and repeating the steps S2 and S3 until the steel truss girder (1) is moved to the preset position.
2. The incremental launching construction method of the steel truss girder of claim 1, wherein the step S2 specifically comprises:
s21: exerting preset vertical force on the steel truss girder (1) by using vertical jacks of the two walking tops (4), so that the walking tops (4) and the sliding block (2) support the steel truss girder (1) together;
s22: exerting a preset horizontal force on the steel truss girder (1) by using horizontal jacks of the two walking jacks (4), so that the sliding block (2) and the steel truss girder (1) move for a horizontal jack stroke on the slideway girder (3);
s23: the vertical jack is retracted, the sliding block (2) is enabled to independently support the steel truss girder (1), and the horizontal jack drives the vertical jack to return to the initial position;
s24: repeating the steps S21, S22 and S23 until the slider (2) and the steel girder (1) are moved on the chute beam (3) by a preset distance.
3. The incremental launching construction method for steel trusses according to claim 1, wherein the predetermined distance is a distance at which at least the next node passes over the walking shoe top (4) behind the moving direction of the steel trusses (1) and the slider (2) does not pass over the walking shoe top (4) in front of the moving direction.
4. The incremental launching construction method of a steel truss girder according to claim 1, wherein the predetermined horizontal force H satisfies H > 0.5 μ1F, and H < mu2P1Wherein, mu2Is the friction coefficient mu between the lower chord of the steel truss girder and the walking top1The coefficient of friction resistance between the sliding block and the walking top and the slideway beam, F is the supporting force when the sliding block supports the steel truss beam independently, P1A preset vertical force.
5. The incremental launching construction method of a steel truss girder according to claim 4, wherein the mu is1And mu2In a relationship of
6. The incremental launching construction method of a steel truss girder according to claim 1, wherein in step S3, the sliding block (2) is pulled to the next node position by a steel strand.
7. The incremental launching construction method for the steel trussed beam according to claim 1, wherein the preset vertical force applied by the walking top (4) to the steel trussed beam (1) is determined according to the bending-resistant bearing capacity allowed by the lower chord of the steel trussed beam (1).
8. An apparatus for performing the incremental launching method of a steel truss as claimed in claim 1, comprising:
a chute beam (3);
the two sets of walking roofs (4) are respectively arranged at two ends of the slideway beam (3) and are used for providing preset vertical force to support the steel truss beam (1) and/or outputting preset horizontal force to push the steel truss beam (1);
and the sliding blocks (2) are arranged on the slideway beams (3), are positioned between the two sets of walking tops (4), and are used for supporting the steel truss beams (1) independently or together with the walking tops (4).
9. The steel truss jacking construction device as claimed in claim 8, wherein the walking jack (4) comprises a horizontal jack and a vertical jack, the vertical jack is used for providing a preset vertical force, and the horizontal jack is used for outputting a preset horizontal force.
10. The steel truss jacking construction device as recited in claim 8 further comprising a spacer block (5) provided on a vertical jack of the walking jack (4).
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| CN113863162A (en) * | 2021-09-26 | 2021-12-31 | 武汉思力特种工程机械施工有限公司 | Large-scale steel truss pushing construction structure and method |
| CN114319146A (en) * | 2021-12-29 | 2022-04-12 | 中交武汉港湾工程设计研究院有限公司 | Steel truss girder walking type pushing device and construction method |
| CN114892540A (en) * | 2022-06-13 | 2022-08-12 | 中交第二公路工程局有限公司 | Walking type pushing device and method for active adjustment of steel truss girder |
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