CN216892442U - Multiple lower chord type large-span beam string structure - Google Patents
Multiple lower chord type large-span beam string structure Download PDFInfo
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- CN216892442U CN216892442U CN202220230621.9U CN202220230621U CN216892442U CN 216892442 U CN216892442 U CN 216892442U CN 202220230621 U CN202220230621 U CN 202220230621U CN 216892442 U CN216892442 U CN 216892442U
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Abstract
The utility model relates to a multiple lower chord type large-span beam string structure which is arranged between two truss steel supports, wherein the truss steel supports are horizontally arranged in a foundation pit, and the beam string structure comprises a beam string upper chord, a main beam string assembly and an auxiliary beam string assembly. According to the utility model, by utilizing the characteristic that the beam string is a hollow beam, the conventional single lower string structure of the beam string is replaced by the multi-stage lower string structure, so that the stress of the beam string is more balanced while the section height of the lower string of the beam string and the number of the stay bars are reduced, the rigidity and the stress capability of the structure are enhanced, and the use span of the steel support beam string of the foundation pit is enlarged.
Description
Technical Field
The utility model relates to the technical field of building construction, in particular to a multi-lower-chord type large-span beam string structure.
Background
In order to ensure the safety of the underground structure construction and the surrounding environment of the foundation pit, the side wall of the foundation pit and the surrounding environment need to be protected by adopting supporting, retaining and reinforcing measures. In deep foundation pit engineering of high-rise buildings and subway construction, most of the deep foundation pit engineering is excavated in cities, various structures such as traffic main roads, built buildings or pipelines and the like usually exist around the foundation pit, and in order to ensure the safety of the surrounding environment of the foundation pit, save the construction period and the cost, the steel structure truss inner support system is widely applied.
In the prior art, a steel structure truss support system and a beam string support system are combined for use, and a single beam string beam lower chord structure is adopted, so that the following defects exist: 1) the sizes of the lower chord pull rod of the beam string and the upper chord section of the beam string are limited, so that the large-span beam string is weak in stress capacity and is not suitable for an ultra-large deep foundation pit; 2) the construction progress is slow due to the fact that the number of the stay bars of the existing large-span beam string is too large.
SUMMERY OF THE UTILITY MODEL
Aiming at the problems in the prior art, the utility model aims to provide a multiple-lower-chord type large-span beam string structure, which adopts a multiple-lower-chord beam structure, adds an auxiliary beam string lower pull rod between main beam string support rods, fully utilizes the waste space of the original structure, increases the structural rigidity, and effectively restrains the upper chord deformation of the beam string, thereby realizing the large span of the beam string.
In order to achieve the purpose, the utility model adopts the technical scheme that:
a multi-lower-chord type large-span beam string structure comprises a beam string upper chord, a main beam string component and an auxiliary beam string component;
the main chord beam assembly comprises two main chord beam lower chord embedded rods, a plurality of main chord beam support rods and a plurality of main chord beam lower chord pull rods, wherein the main chord beam support rods are positioned between the two main chord beam lower chord embedded rods and are connected with the tension chord beam upper chord; one end of the main chord beam lower chord embedded rod is embedded in the upper chord of the beam string, and the other end of the main chord beam lower chord embedded rod is connected with the main chord beam brace rod; the lower chord pull rod of the main chord beam is connected between two adjacent main chord beam support rods, and two ends of the lower chord pull rod of the main chord beam are respectively connected with the two main chord beam support rods;
the secondary beam string component comprises at least one stage of secondary beam string component, namely at least one stage of secondary beam string component; each level of auxiliary string beam assembly comprises two auxiliary string beam lower string embedded rods, a plurality of auxiliary string beam brace rod groups and a plurality of auxiliary string beam lower string pull rods, each auxiliary string beam brace rod group comprises at least one auxiliary string beam brace rod, each auxiliary string beam brace rod is connected with a string beam upper string, one end of each auxiliary string beam lower string embedded rod is connected with a string beam upper string, and the other end of each auxiliary string beam lower string embedded rod is connected with a main string beam brace rod;
the secondary beam string stay bar group of the primary secondary beam string component is arranged between two adjacent claim beam string stay bars; one end of the lower chord pull rod of the auxiliary beam string is connected with the supporting rod of the auxiliary beam string, and the other end of the lower chord pull rod of the auxiliary beam string is connected with the supporting rod of the adjacent auxiliary beam string or the supporting rod of the main beam string.
The secondary beam string component comprises more than two secondary beam string components, and the secondary beam string stay bar group of each secondary beam string component is arranged between the main beam string stay bar and the secondary beam string stay bar and between the two secondary beam string stay bars except the primary secondary beam string component; one end of the lower chord pull rod of the auxiliary beam string is connected with the supporting rod of the auxiliary beam string, and the other end of the lower chord pull rod of the auxiliary beam string is connected with the supporting rod of the adjacent auxiliary beam string or the supporting rod of the main beam string.
The main chord beam lower chord pull rod is connected to the end part of the main chord beam support rod, and the secondary tension chord beam lower chord pull rod of the first-stage secondary tension chord beam assembly is connected to the belly part of the main chord beam support rod and the end part of the secondary tension chord beam support rod.
The main chord beam lower chord pull rod is connected to the end part of the main chord beam support rod, and the auxiliary tension chord beam lower chord pull rod of the first-stage auxiliary tension chord beam assembly is connected to the belly part of the main chord beam support rod and the end part of the auxiliary tension chord beam support rod; the lower chord pull rod of the auxiliary beam string component below the second level is connected with the belly of the main beam string stay, the belly of the auxiliary beam string stay of the superior auxiliary beam string component and the end of the auxiliary beam string stay of the current level auxiliary beam string component.
The main chord beam brace and the secondary tension chord beam brace both comprise web members and prestress applying devices; the web members are profile steel support rods.
The main beam lower chord pull rod and the auxiliary beam lower chord pull rod are steel pull rods.
The supporting rods of the string-making beam are arranged at equal intervals.
The auxiliary beam string supporting rods are arranged at equal intervals.
By adopting the scheme, the single lower chord structure of the conventional beam string is replaced by the multi-stage lower chord structure by utilizing the characteristic that the beam string is the hollow beam, so that the stress of the beam string is more balanced while the section height of the lower chord of the beam string and the number of the stay bars are reduced, the rigidity and the stress capability of the structure are enhanced, and the use span of the steel support beam string of the foundation pit is expanded.
Drawings
FIG. 1 is a schematic view of an embodiment of the present invention;
FIG. 2 is a partial schematic view of the present invention.
Description of reference numerals:
a truss steel support 10;
claim a chord member assembly 20; claim the embedded rod 21 of the lower chord of the chord beam; a main chord beam lower chord stay 22; a main chord beam stay 23;
the secondary beam string assembly 30; a lower chord embedded rod 31 of the auxiliary beam string; a secondary beam string lower chord pull rod 32; the secondary beam string stay 33;
the beam string is strung 40.
Detailed Description
As shown in fig. 1 and 2, the utility model discloses a multiple lower chord type large-span beam string structure, which is arranged between two truss steel supports 10, wherein the truss steel supports 10 are horizontally arranged in a foundation pit, and the beam string structure comprises a beam string upper chord 40, a main beam string assembly 20 and a secondary beam string assembly 30.
The main chord beam assembly 20 comprises two main chord beam lower chord embedded rods 21, a plurality of main chord beam support rods 23 and a plurality of main chord beam lower chord pull rods 22, wherein the main chord beam support rods 23 are positioned between the two main chord beam lower chord embedded rods 21 and are connected with the tensioned chord beam upper chord 40; one end of the main chord beam lower chord embedded rod 21 is embedded in the tensioned chord beam upper chord 40, and the other end is connected with the main chord beam brace rod 23; the main chord beam lower chord pull rod 22 is connected between two adjacent main chord beam stay rods 23, and two main chord beam stay rods 23 are respectively connected at two ends of the main chord beam lower chord pull rod.
The auxiliary beam string component 30 comprises at least one auxiliary beam string component 30, each auxiliary beam string component 30 comprises two auxiliary beam string lower embedded rods 31, a plurality of auxiliary beam string stay rod groups and a plurality of auxiliary beam string lower stay rods 32, each auxiliary beam string stay rod group comprises at least one auxiliary beam string stay rod 33, and the auxiliary beam string stay rods 33 are connected with the beam string upper strings 40; one end of the auxiliary beam string lower embedded rod is connected with the beam string upper string 40, and the other end is connected with the main beam string supporting rod 32.
In the embodiment of the present invention, the secondary beam string assembly 30 includes a primary secondary beam string assembly 30, i.e., a primary secondary beam string assembly. The secondary beam string brace group of the primary secondary beam string component is arranged between two adjacent claim beam string braces 23; one end of the secondary beam string lower chord pull rod 32 of the primary secondary beam string component is connected with the secondary beam string stay 33, and the other end is connected with the second end of the adjacent secondary beam string stay 33 or the main beam string stay 23. The main chord lower chord 22 is connected to the end of the main chord stay 23, and the secondary tension chord lower chord 32 of the first-stage secondary tension chord assembly is connected to the web of the main chord stay 23 and the end of the secondary tension chord stay 33.
When the auxiliary beam string component 30 comprises more than two stages of auxiliary beam string components 30, except for the first stage of auxiliary beam string component, the auxiliary beam string stay group of each stage of auxiliary beam string component is arranged between the main beam string stay 23 and the auxiliary beam string stay 33 and between the two auxiliary beam string stays 33; one end of the lower chord tension rod 32 of the auxiliary beam string is connected with the supporting rod 33 of the auxiliary beam string, and the other end is connected with the supporting rod 33 of the adjacent auxiliary beam string or the supporting rod 23 of the main beam string. Specifically, the sub-tensioned-girder lower chord 32 of the sub-tensioned-girder assembly 30 below the second stage is connected to the web of the main tension girder strut 23, the web of the sub-tensioned-girder strut 33 of the upper-stage sub-tensioned-girder assembly, and the end of the sub-tensioned-girder strut 33 of the present-stage sub-tensioned-girder assembly.
In this embodiment, the connection between the claiming string beam lower chord tension rod 22 and the claiming string beam brace 23, the connection between the auxiliary tension string beam lower chord tension rod 32 and the claiming string beam brace 23, and the connection between the auxiliary tension string beam lower chord tension rod 32 and the auxiliary tension string beam brace 33 are implemented by the pin shaft cooperating with the ear plate, and the connection structure may be implemented by using an existing connection structure, which is not described herein again.
In this embodiment, the beam string upper chord 40 is a concrete beam. The main beam brace 23 and the secondary beam brace 33 both comprise web members and prestress applying devices; the web members are profile steel support rods. The main beam lower chord pull rod 22 and the auxiliary beam lower chord pull rod 32 are steel pull rods. The main beam struts 23 are arranged at equal intervals, and the auxiliary beam struts 33 are also arranged at equal intervals.
During specific installation, the main chord beam lower chord embedded rod 21 is embedded in a concrete beam (an upper chord 40 of a tension chord beam), the main chord beam stay bar 23 and the auxiliary tension chord beam stay bar 33 are hoisted and fixed on a support, and then the main chord beam lower chord pull rod 22 and the auxiliary tension chord beam lower chord pull rod 32 are installed and fixedly connected through a pin shaft and a stay bar.
According to the utility model, by utilizing the characteristic that the beam string is a hollow beam, the conventional single lower string structure of the beam string is replaced by the multi-stage lower string structure, so that the stress of the beam string is more balanced while the section height of the lower string of the beam string and the number of the stay bars are reduced, the rigidity and the stress capability of the structure are enhanced, and the use span of the steel support beam string of the foundation pit is enlarged.
The above description is only exemplary of the present invention and is not intended to limit the technical scope of the present invention, so that any minor modifications, equivalent changes and modifications made to the above exemplary embodiments according to the technical spirit of the present invention are within the technical scope of the present invention.
Claims (8)
1. The utility model provides a string roof beam structure is opened to multiple lower string formula large-span which characterized in that: the tension string beam upper chord maintaining device comprises a tension string beam upper chord, a tension string beam assembly and an auxiliary tension string beam assembly;
the main chord beam assembly comprises two main chord beam lower chord embedded rods, a plurality of main chord beam support rods and a plurality of main chord beam lower chord pull rods, wherein the main chord beam support rods are positioned between the two main chord beam lower chord embedded rods and are connected with the tension chord beam upper chord; one end of the main chord beam lower chord embedded rod is embedded in the upper chord of the beam string, and the other end of the main chord beam lower chord embedded rod is connected with the main chord beam brace rod; the lower chord pull rod of the main chord beam is connected between two adjacent main chord beam support rods, and two ends of the lower chord pull rod of the main chord beam are respectively connected with the two main chord beam support rods;
the secondary beam string component comprises at least one stage of secondary beam string component, namely at least one stage of secondary beam string component; each level of auxiliary string beam assembly comprises two auxiliary string beam lower string embedded rods, a plurality of auxiliary string beam brace rod groups and a plurality of auxiliary string beam lower string pull rods, each auxiliary string beam brace rod group comprises at least one auxiliary string beam brace rod, each auxiliary string beam brace rod is connected with a string beam upper string, one end of each auxiliary string beam lower string embedded rod is connected with a string beam upper string, and the other end of each auxiliary string beam lower string embedded rod is connected with a main string beam brace rod;
the secondary beam string stay bar group of the primary secondary beam string component is arranged between two adjacent claim beam string stay bars; one end of the lower chord pull rod of the auxiliary beam string is connected with the supporting rod of the auxiliary beam string, and the other end of the lower chord pull rod of the auxiliary beam string is connected with the supporting rod of the adjacent auxiliary beam string or the supporting rod of the main beam string.
2. The multiple lower chord type large-span beam string structure according to claim 1, wherein: the secondary beam string component comprises more than two secondary beam string components, and the secondary beam string stay bar group of each secondary beam string component is arranged between the main beam string stay bar and the secondary beam string stay bar and between the two secondary beam string stay bars except the primary secondary beam string component; one end of the lower chord pull rod of the auxiliary beam string is connected with the supporting rod of the auxiliary beam string, and the other end of the lower chord pull rod of the auxiliary beam string is connected with the supporting rod of the adjacent auxiliary beam string or the supporting rod of the main beam string.
3. The multiple lower chord type large-span beam string structure according to claim 1, wherein: the main chord beam lower chord pull rod is connected to the end part of the main chord beam support rod, and the secondary tension chord beam lower chord pull rod of the first-stage secondary tension chord beam assembly is connected to the belly part of the main chord beam support rod and the end part of the secondary tension chord beam support rod.
4. The multiple lower chord type large-span beam string structure according to claim 2, wherein: the main chord beam lower chord pull rod is connected to the end part of the main chord beam support rod, and the auxiliary tension chord beam lower chord pull rod of the first-stage auxiliary tension chord beam assembly is connected to the belly part of the main chord beam support rod and the end part of the auxiliary tension chord beam support rod; the lower chord pull rod of the auxiliary beam string component below the second level is connected with the belly of the main beam string stay, the belly of the auxiliary beam string stay of the superior auxiliary beam string component and the end of the auxiliary beam string stay of the current level auxiliary beam string component.
5. The multiple lower chord type large-span beam string structure according to claim 1 or 2, wherein: the main chord beam brace and the secondary tension chord beam brace both comprise web members and prestress applying devices; the web members are profile steel support rods.
6. The multiple lower chord type large-span beam string structure according to claim 1 or 2, wherein: the main beam lower chord pull rod and the auxiliary beam lower chord pull rod are steel pull rods.
7. The multiple lower chord type large-span beam string structure according to claim 1 or 2, wherein: the supporting rods of the string-making beam are arranged at equal intervals.
8. The multiple lower chord type large-span beam string structure according to claim 1 or 2, wherein: the auxiliary beam string supporting rods are arranged at equal intervals.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220230621.9U CN216892442U (en) | 2022-01-27 | 2022-01-27 | Multiple lower chord type large-span beam string structure |
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| CN202220230621.9U CN216892442U (en) | 2022-01-27 | 2022-01-27 | Multiple lower chord type large-span beam string structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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2022
- 2022-01-27 CN CN202220230621.9U patent/CN216892442U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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