CN108625530B - Beam string structure and construction method thereof - Google Patents
Beam string structure and construction method thereof Download PDFInfo
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- CN108625530B CN108625530B CN201810672234.9A CN201810672234A CN108625530B CN 108625530 B CN108625530 B CN 108625530B CN 201810672234 A CN201810672234 A CN 201810672234A CN 108625530 B CN108625530 B CN 108625530B
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- 239000007787 solid Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 abstract description 8
- 238000004804 winding Methods 0.000 abstract description 6
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- 238000010586 diagram Methods 0.000 description 3
- 230000004075 alteration Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
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Abstract
The invention provides a beam string structure and a construction method thereof, the beam string structure comprises: the bridge cable comprises a secondary bridge, an upper bridge connecting unit, a bridge support rod and a bridge support lower string cable, wherein at least two secondary bridge supports are connected through at least one upper bridge connecting unit to form a bridge support upper string, the upper end of the bridge support rod is connected with the upper bridge connecting unit, the lower end of the bridge support rod is connected with the bridge support lower string cable, and the two ends of the bridge support lower string cable are respectively connected with the two ends of the bridge support upper string. According to the invention, the beam Duan Tihuan of the conventional beam string, which is positioned between the struts, is used as a secondary beam string, and the characteristic that the beam string is used as a blank beam is utilized, so that the number of the struts of the beam string is reduced, and meanwhile, the section height of the rigid member for winding is greatly reduced, so that the large-span structure adopting the beam string has smaller beam height and high span ratio on the whole, the building appearance is lighter and thinner, the building effect is better, and the difficulty and complexity of the stretching process of site construction can be reduced while the struts are reduced.
Description
Technical Field
The invention relates to the technical field of building structures, in particular to a beam string structure and a construction method thereof.
Background
At present, the field of civil engineering, the application of beam string structures is increasing. The beam string structure is a mixed structure system formed by a rigid member winding, a flexible stay rope and a stay bar, and the structure is a self-balancing system, and is a large-span prestress space structure system. The beam string structure system is simple, the stress is definite, the structure form is various, and the advantages of the two materials of rigidity and flexibility are fully exerted.
Fig. 1 provides a conventional straight beam type beam string structure, which comprises an upper string 10, a stay bar 12, a lower string stay cable 13 and a support 14; the two ends of the upper chord 10 are respectively connected to the two supports 14, the upper ends of the two stay bars 12 are connected to the upper chord 10, the lower ends of the two stay bars 12 are connected to the lower chord stay rope 13, and the two ends of the lower chord stay rope 13 are respectively connected to the two ends of the upper chord 10.
However, with the conventional large span beam structure, when the number of braces 12 is small, the spacing between the braces 12 is relatively large, and at this time, it is often required that the upper chord 10 have a relatively large cross section to satisfy the requirements of rigidity, strength, stability, and the like of the upper chord 10. If the height h0 of the upper chord section is larger, the overall height and the high span ratio of the beam string structure are easily increased, and the construction effect and the service performance are restricted.
Disclosure of Invention
The invention aims to provide a beam string structure and a construction method thereof, which are used for solving the problems of large overall height and high span ratio of the existing beam string structure.
To achieve the above and other related objects, the present invention provides a bridge structure comprising a secondary bridge, an upper bridge connecting unit, a bridge stay and a bridge lower cable;
at least two secondary beam strings are connected through at least one upper string connecting unit to form a main beam upper string; the upper end of at least one of the claimed string beam stay bars is connected with the upper string connecting unit, the lower end of the claimed string beam stay bar is connected with the claimed string beam lower string inhaul cable, and two ends of the claimed string beam lower string inhaul cable are respectively connected with two ends of the claimed string beam upper string.
Optionally, each secondary beam comprises a secondary beam upper chord, a secondary beam stay and a secondary beam lower chord stay; the upper end of the secondary beam string stay bar is connected with the secondary beam string, the lower end of the secondary beam string stay bar is connected with the secondary beam string lower stay cable, and two ends of the secondary beam string lower stay cable are respectively connected with two ends of the secondary beam string.
Optionally, in each of the secondary beam-string struts, one secondary beam-string strut is provided.
Optionally, in each of the secondary beam, the secondary beam struts are plural.
Optionally, the plurality of secondary beam struts are uniformly distributed in the length direction of the upper chord of the secondary beam.
Optionally, the secondary beam strut and the claim beam strut are on the same side of the secondary beam as the upper chord.
Optionally, the upper chord of the secondary beam string is a solid web girder or truss.
Optionally, the upper chord of the secondary beam string is of a straight beam structure.
Optionally, the upper chord connection unit is a solid web girder or truss.
Optionally, the beam structure further comprises a support and a supporting structure;
and the two ends of the upper chord of the claimed string beam are also connected with the supporting structure through a support respectively.
To achieve the above object and other related objects, the present invention further provides a construction method of a beam string structure, including:
prefabricating at least two secondary beam strings from a factory or in the field;
connecting at least two secondary beam strings together at a construction site through at least one string-up connecting unit to form a string-up of the beam string;
connecting the upper end of at least one of the claimed string beam stay bars with the upper string connecting unit, and connecting the lower end of at least one of the claimed string beam stay bars with the claimed string beam lower string inhaul cable,
and connecting the two ends of the lower chord inhaul cable of the claimed chord beam with the two ends of the upper chord of the claimed chord beam respectively to obtain a chord beam structure.
Optionally, connecting two ends of the lower chord cable of the claimed chord beam with two ends of the upper chord of the claimed chord beam respectively, including:
placing two ends of the lower chord cable of the claiming chord beam at two ends of the upper chord of the claiming chord beam; and
and tensioning the lower chord inhaul cable of the claimed chord beam.
Optionally, two ends of the lower chord cable of the claimed chord beam are respectively connected with two ends of the upper chord of the claimed chord beam, and the method further comprises:
and connecting the two ends of the upper chord of the claimed string beam with the supporting structure through a support respectively.
Compared with the prior art, the beam structure provided by the invention comprises a secondary beam, an upper beam connecting unit, a beam claiming stay bar and a beam claiming stay cable, wherein at least two secondary beams are connected through at least one upper beam connecting unit and form a beam claiming stay, so that the main and secondary levels are divided according to a force transmission path, the upper beam section of a conventional beam claiming between the stay bars is replaced by at least two secondary beams, the characteristic that the beam claiming stay bar is an empty beam is utilized, the number of beam claiming stay bars is reduced, and meanwhile, the height of the beam claiming stay bar upper beam rigid member section is greatly reduced, so that the large-span structure adopting the beam claiming stay bar structure has smaller beam height and high span ratio on the whole, the building appearance is better, the building effect is lighter and thinner, and the difficulty and complexity of the beam claiming stay cable lower beam in the field construction tensioning process can be reduced;
furthermore, in the beam string structure provided by the invention, at least two secondary beam strings can be prefabricated by a factory end and assembled on a construction site, and the construction method can enable the construction process to be more convenient and improve the construction efficiency.
Drawings
FIG. 1 is a schematic view of a conventional straight beam type beam string structure;
FIG. 2 is a schematic view of a beam structure according to a first embodiment of the present invention;
FIG. 3 is a schematic view of a secondary beam string in accordance with a first embodiment of the present invention;
FIG. 4 is a schematic view of a beam structure of a second embodiment of the present invention;
fig. 5 is a schematic view of a beam structure of a third embodiment of the present invention.
In the figure:
10-winding; 12-stay bars; 13-lower chord inhaul cable; 14-supporting seats;
21-a winding connection unit; 22-claiming a string beam stay; 23-claiming a string beam lower string inhaul cable; 24-supporting seats; 30-secondary beam string; 31-winding the secondary beam string; 32-secondary beam string struts; 33-secondary beam string cable.
Detailed Description
Based on the straight beam type string beam structure described in the background art, the inventor finds that, although the section height h0 of the upper string 10 can be reduced by adding the stay bar 12, the included angle between the adjacent cable segments at two sides of the lower end of the stay bar 12 can be increased, so that the efficiency of providing vertical force for the stay bar 12 by the lower string stay cable 13 is reduced; meanwhile, the difficulty and complexity of the field construction tensioning process are increased due to the fact that more support rods 12 are arranged, and the building effect is affected to a certain extent.
Therefore, the invention provides a grading beam string structure, which utilizes the characteristic that the beam string is a hollow beam, and reduces the number of stay bars and the height of the section of a rigid member for winding by replacing the beam section of the conventional beam string, which is positioned between the stay bars, with a secondary beam string.
The beam chord structure proposed by the invention is further described in detail below with reference to the accompanying drawings and specific examples. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the invention. Furthermore, the structures shown in the drawings are often part of actual structures. In particular, the drawings are shown with different emphasis instead being placed upon illustrating the various embodiments.
As used in this specification, the singular forms "a", "an" and "the" include plural referents unless the content clearly dictates otherwise.
[ embodiment one ]
First, please refer to fig. 2, which is a schematic diagram of a beam structure according to a first embodiment of the present invention, wherein the beam structure is a straight beam type beam structure, and includes a secondary beam 30, an upper chord connection unit 21, a beam-claiming stay 22, and a beam-claiming lower chord cable 23.
In this embodiment, three secondary beam strings 30 are sequentially connected to each other, and adjacent secondary beam string strings 30 are connected by one upper string connecting unit 21, so that the three secondary beam string strings 30 together form a straight beam type upper string of the claimed beam string. In addition, each upper chord connection unit 21 is connected with the upper end of one of the claimed chord beam support rods 22, the lower end of the claimed chord beam support rod 22 is connected with the claimed chord beam lower chord inhaul cable 23, and two ends of the claimed chord beam lower chord inhaul cable 23 are respectively connected with two ends of the claimed chord beam upper chord.
The invention utilizes the characteristic that the beam string is a hollow beam, and the beam Duan Tihuan of the conventional beam string, which is positioned between the struts, is three secondary beam string beams 30, so that the section height of the beam string upper rigid member can be greatly reduced, the large-span structure adopting the beam string structure has smaller beam height and high span ratio on the whole, the building appearance is lighter and thinner, the building effect is better, and the difficulty and complexity of the field construction tensioning process can be reduced while the beam string struts are claimed.
With continued reference to fig. 2, the ends of the upper chord of the claimed bridge are also each connected to a support 24 and to the support structure by means of the support.
Fig. 3 is a schematic view of a secondary beam according to a first embodiment of the present invention, and as shown in fig. 3, each secondary beam 30 includes a secondary beam upper chord 31, a secondary beam brace 32, and a secondary beam lower chord cable 33; the number of the secondary beam stay bars 32 is two, the upper ends of the two secondary beam stay bars 32 are connected with the secondary beam upper strings 31, the lower ends of the two secondary beam stay bars 32 are connected with the secondary beam lower string stay cables 33, and the two ends of the secondary beam lower string stay cables 33 are respectively connected with the two ends of the secondary beam upper strings 31. Wherein, the secondary beam upper chord 31 is a straight beam structure, so as to obtain a straight beam type of the upper chord of the beam.
Here, any one of the secondary beam 30 is a part of the entire beam structure, and its span is relatively small, so that the section height h1 of the secondary beam upper chord 31 can also be designed to be small. And any secondary beam string 30 is an independent self-balancing system, and can be prefabricated by factories or on site, so that the assembly and tensioning construction of the secondary beam string stay 32 and the secondary beam string stay 33 on site are avoided, and the site construction process is convenient.
In this embodiment, in each of the secondary beam struts 30, two secondary beam struts 32 may be uniformly distributed along the length direction of the secondary beam upper chord 31. In addition, the inventor discovers through mechanical analysis that fewer stay bars are used, so that the included angle between adjacent cable sections on two sides of the lower end of the stay bar can be reduced, and the efficiency of providing vertical force for the stay bar by the lower chord stay cable is improved. In this embodiment, the primary and secondary two-stage members each have fewer struts, and the primary and secondary lower chord cables thereof have higher efficiency in providing strut upward thrust.
Further, the secondary tailpiece brace 32 is preferably disposed on the same side of the secondary tailpiece as the claimed string Liang Chenggan. When the main beam stay bars and the secondary beam stay bars are arranged on the same side, the characteristics that the beam stays are hollow beams can be utilized, so that the height of the secondary component is integrated into the height range of the main component, and the overall height of the beam stay structure is effectively reduced.
Still further, one or both of the secondary beam upper chord 31 and the upper chord connection unit 21 may be constructed of a solid web beam, truss, or the like.
It should be noted that, the number of the secondary beam strings 30 in the present embodiment is not limited to three, and not less than two secondary beam strings 30 may be adopted according to actual engineering conditions, and two adjacent secondary beam strings 30 are connected by at least one upper chord connection unit 21. Therefore, when the secondary beam string 30 is two, only one beam string stay 22 is required to be arranged, so that the efficiency of providing vertical force for the beam string stay 22 by the beam string lower stay cable 23 can be greatly improved.
[ example two ]
Referring to fig. 4, a schematic diagram of a beam structure according to a second embodiment of the present invention is shown, and the difference between the beam structure and the first embodiment is that: the number of the secondary beam strings 30 in this embodiment is four, the four secondary beam string strings 30 are sequentially connected, and two adjacent secondary beam string strings 30 are connected by one upper string connecting unit 21, and only 1 secondary beam string stay 32 is provided in each secondary beam string 30. Thus, the span of the beam structure of the present embodiment is larger, and the structure of each secondary beam 30 is simpler.
[ example III ]
Referring to fig. 5, a schematic diagram of a beam structure according to a third embodiment of the present invention is shown, and the difference between the beam structure and the first embodiment is that: the number of the secondary bridge beams 30 in the present embodiment is two, the two secondary bridge beams 30 are connected by one upper chord connecting unit 21, and the secondary bridge upper chord 31 in each secondary bridge beam 30 is of an arch structure, so that the obtained main bridge upper chord is also of an arch structure, and therefore, the bridge structure of the present embodiment is constructed as an arch bridge structure.
In the above embodiment, the secondary beam struts 32 in each secondary beam 30 may be 1, 2 or more, and preferably, the plurality of secondary beam struts 32 are uniformly distributed along the length direction of the secondary beam upper chord 31 to ensure the stress balance. In addition, in the beam structure of the present invention, the structures of the plurality of secondary beams 30 that are positioned between the beam struts 22 on the beam may be the same or different, for example, the number of secondary beam struts 32 may be different so that the structures of the secondary beams 30 are different.
[ example IV ]
The embodiment of the invention also provides a construction method of the string beam structure, which comprises the following steps:
prefabricating at least two secondary beam strings from a factory or in the field;
connecting at least two secondary beam strings together at a construction site through at least one string-up connecting unit to form a string-up of the beam string;
connecting the upper end of at least one of the claimed string beam stay bars with the upper string connecting unit, and connecting the lower end of at least one of the claimed string beam stay bars with the claimed string beam lower string inhaul cable,
and connecting the two ends of the lower string pulling cable of the claimed string beam with the two ends of the upper string of the claimed string beam respectively to obtain a string beam structure.
Further, connecting two ends of the lower chord cable of the claimed chord beam with two ends of the upper chord of the claimed chord beam respectively, including:
placing two ends of the lower chord cable of the claiming chord beam at two ends of the upper chord of the claiming chord beam; and
and tensioning the lower chord inhaul cable of the claimed chord beam.
Further, connecting two ends of the lower chord cable of the claimed chord beam with two ends of the upper chord of the claimed chord beam respectively, and further comprising:
and connecting the two ends of the upper chord of the claimed string beam with a supporting structure through a support respectively, thus completing the construction of a grading string beam structure which is formed by the main component and the secondary component together and is stressed integrally.
Therefore, the construction method provided by the embodiment can realize that the secondary beam string is prefabricated by a factory or on site and assembled on site, so that the setting of the stay bars on the construction site is reduced, and the difficulty and complexity of the construction and tensioning process of the lower string stay cable on site are reduced. In addition, the prefabricated components of the factory can greatly improve the construction precision and ensure the construction quality.
The above description is only illustrative of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention, and any alterations and modifications made by those skilled in the art based on the above disclosure shall fall within the scope of the appended claims.
Claims (12)
1. The string beam structure is characterized by comprising a secondary string beam, an upper string connecting unit, a string beam claiming stay bar and a string beam claiming lower string stay cable;
at least two secondary beam strings are connected through at least one upper string connecting unit to form a main beam upper string; the upper end of at least one of the claimed string beam stay bars is connected with the upper string connecting unit, the lower end of the claimed string beam stay bar is connected with the claimed string beam lower string inhaul cable, and two ends of the claimed string beam lower string inhaul cable are respectively connected with two ends of the claimed string beam upper string;
each secondary beam comprises a secondary beam upper chord, a secondary beam brace and a secondary beam lower chord stay cable; the upper end of the secondary beam string stay bar is connected with the secondary beam string, the lower end of the secondary beam string stay bar is connected with the secondary beam string lower stay cable, and two ends of the secondary beam string lower stay cable are respectively connected with two ends of the secondary beam string;
wherein at least two of said secondary beam strings are prefabricated from a factory or in the field.
2. The beam structure of claim 1, wherein in each of said secondary beam struts, one of said secondary beam struts.
3. The beam structure of claim 1, wherein in each of said secondary beam, said secondary beam struts are plural.
4. A beam-string structure according to claim 3, wherein a plurality of the secondary beam-string struts are uniformly distributed in the length direction of the secondary beam upper string.
5. A beam-string structure as claimed in any one of claims 1 to 4, wherein the secondary beam-string brace is on the same side of the secondary beam-string as the claimed beam-string brace.
6. A beam-string structure as claimed in any one of claims 1 to 4, wherein the secondary beam-string is a solid web or truss.
7. The beam-string structure of claim 1, wherein the secondary beam-string is a straight beam structure.
8. The beam-string structure according to claim 1, wherein the upper string connecting unit is a solid web beam or truss.
9. The beam-chord structure of claim 1, further comprising: a support and a support structure;
and the two ends of the upper chord of the claimed string beam are also connected with the supporting structure through a support respectively.
10. The construction method of the string beam structure is characterized by comprising the following steps of:
prefabricating at least two secondary beam strings from a factory or in the field;
connecting at least two secondary beam strings together at a construction site through at least one string-up connecting unit to form a string-up of the beam string;
connecting the upper end of at least one of the claiming bridge stay bars with the upper chord connecting unit, and connecting the lower end of at least one of the claiming bridge stay bars with a claiming bridge lower chord stay cable;
connecting two ends of the lower chord inhaul cable of the claimed chord beam with two ends of the upper chord of the claimed chord beam respectively to obtain a chord beam structure;
each secondary beam comprises a secondary beam upper chord, a secondary beam stay bar and a secondary beam lower chord stay cable; the upper end of the secondary beam string stay bar is connected with the secondary beam string, the lower end of the secondary beam string stay bar is connected with the secondary beam string lower stay cable, and two ends of the secondary beam string lower stay cable are respectively connected with two ends of the secondary beam string.
11. The construction method of the beam string structure according to claim 10, wherein connecting both ends of the beam string lower cable with both ends of the beam string upper cable, respectively, comprises:
placing two ends of the lower chord cable of the claiming chord beam at two ends of the upper chord of the claiming chord beam; and
and tensioning the lower chord inhaul cable of the claimed chord beam.
12. The construction method of a beam string structure according to claim 10, wherein connecting both ends of the beam string lower cable with both ends of the beam string upper cable, respectively, further comprises:
and connecting the two ends of the upper chord of the claimed string beam with the supporting structure through a support respectively.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113529740B (en) * | 2021-07-29 | 2023-03-17 | 江西建工第一建筑有限责任公司 | Beam string supporting system |
| CN114427228A (en) * | 2022-01-27 | 2022-05-03 | 厦门安捷建筑工程有限公司 | A multiple lower chord formula large-span beam string structure of stretching for foundation ditch |
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