Large-span cantilever truss system using torsion-resistant parallel-string trusses

Abstract

The invention relates to a large-span cantilever truss system using torsion-resistant parallel chord trusses, which is arranged on the outer sides of existing structural columns and existing boundary beams, each existing boundary beam is supported and connected between two adjacent existing structural columns, and the large-span cantilever truss system comprises a first cantilever truss connected with the existing structural columns, a second cantilever truss connected with the first cantilever truss, and a third cantilever truss connected with the second cantilever truss, the first cantilever truss is fixedly connected with the existing structural column through a lower chord fixing support, and the position of the lower chord fixing support is lower than the connecting position of the existing structural column and the existing boundary beam; the torsion-resistant parallel chord trusses are connected between every two adjacent first cantilever trusses in a supporting mode, the torsion-resistant parallel chord trusses are arranged at the ends, close to the existing structural columns, of the first cantilever trusses, and the side portions of the torsion-resistant parallel chord trusses are fixedly connected with the existing boundary beams through upper chord fixing supports. The arrangement position of the lower chord fixing support is lower than the connection position of the existing structural column and the existing boundary beam, so that a beam connection node of the existing structural column can be avoided, and the problem that steel bars are difficult to plant in a node core area can be avoided.

Description

Technical Field

[0001] The invention relates to the technical field of building engineering, and in particular to a large-span cantilever truss system utilizing torsion-resistant parallel chord trusses. Background Art

[0002] In the renovation of existing buildings, in order to fully expand the building space and improve the facade effect, it is common to add external cantilevers on the basis of the original structure. Compared with the traditional external cantilever structure, adding an external cantilever structure on the basis of the existing structure requires full consideration of the stress characteristics of the original structure, and reducing the reinforcement measures of the original structure as much as possible under the premise of ensuring the safety of the structure. The steel structure has a light weight and strong bearing capacity, which can meet the requirements of this type of structure. However, directly adding a steel structure cantilever beam to the original structure also has the problem of greatly increasing the vertical load and difficulty in embedding the steel bars in the core area of ​​the node when the embedded parts are placed later. Summary of the invention

[0003] The purpose of the present invention is to overcome the defects of the prior art and provide a large-span cantilever truss system using torsion-resistant parallel chord trusses to solve the problems of the existing steel structure cantilever having a significant increase in vertical load and difficulty in embedding reinforcement in the core area of ​​the node when post-embedded parts are installed.

[0004] The technical solution to achieve the above purpose is:

[0005] The present invention provides a large-span cantilever truss system using a torsion-resistant parallel chord truss, which is arranged outside an existing structural column and an existing side beam, wherein the existing side beam is supported and connected between two adjacent existing structural columns. The large-span cantilever truss system comprises:

[0006] A first cantilever truss connected to an existing structural column, wherein the first cantilever truss is connected and fixed to the existing structural column via a lower chord fixed support, and the position of the lower chord fixed support is lower than the connection between the existing structural column and the existing side beam;

[0007] A torsion-resistant parallel chord truss is supported and connected between two adjacent first cantilever trusses. The torsion-resistant parallel chord truss is arranged at one end of the first cantilever truss close to the existing structural column. The side of the torsion-resistant parallel chord truss is connected and fixed to the existing side beam through an upper chord fixing support.

[0008] A further improvement of the large-span cantilever truss system using torsion-resistant parallel chord trusses of the present invention is that it also includes at least one second cantilever truss arranged outside the torsion-resistant parallel chord truss, and the second cantilever truss is supported and connected to the adjacent first cantilever truss by a horizontal tie rod.

[0009] A further improvement of the large-span cantilever truss system using the torsion-resistant parallel chord truss of the present invention is that an upper chord fixing support is provided at a position on the torsion-resistant parallel chord truss corresponding to the second cantilever truss.

[0010] A further improvement of the large-span cantilever truss system using torsion-resistant parallel chord trusses of the present invention is that the arrangement position of the second cantilever truss corresponds to the position of the existing secondary beam connected to the existing side beam.

[0011] A further improvement of the large-span cantilever truss system using torsion-resistant parallel chord trusses of the present invention is that there are multiple horizontal tie rods.

[0012] A further improvement of the large-span cantilever truss system using a torsion-resistant parallel chord truss of the present invention is that the upper chord fixed support includes a first connecting member, a second connecting member and a plurality of fastening connecting members; the first connecting member is provided with a connecting hole; the second connecting member is provided with a vertical adjustment hole corresponding to the connecting hole on the first connecting member;

[0013] The fastener is provided with corresponding vertical adjustment holes and connection holes, so as to fasten the second connection member and the first connection member to the existing side beam;

[0014] The second connecting member is provided with a connecting portion connected to the torsion-resistant parallel chord truss.

[0015] A further improvement of the large-span cantilever truss system utilizing a torsion-resistant parallel chord truss of the present invention is that the connecting portion is a connecting rod, the connecting rod is connected to the corresponding upper chord on the torsion-resistant parallel chord truss, and the connection position of the connecting rod corresponds to the connection position of the connecting cross bar connected to the upper chord.

[0016] The further improvement of the long-span cantilever truss system using the torsion-resistant parallel chord truss of the present invention is that the torsion-resistant parallel chord truss comprises a pair of upper chords, a pair of lower chords, a connecting horizontal bar supported and connected between the pair of upper chords and between the pair of lower chords, a connecting vertical bar supported and connected between the opposite upper chords and lower chords, and a connecting diagonal bar supported and connected between the pair of upper chords, between the pair of lower chords, and between the opposite upper chords and lower chords;

[0017] The upper chord fixing support is connected and fixed to an upper chord rod arranged close to the existing side beam.

[0018] A further improvement of the long-span cantilever truss system using a torsion-resistant parallel chord truss of the present invention is that the first cantilever truss comprises an upper cantilever rod, a lower cantilever rod, a support vertical rod supported and connected between the upper cantilever rod and the lower cantilever rod, a support diagonal rod supported and connected between the upper cantilever rod and the lower cantilever rod, and a diagonal brace supported and connected between the cantilever ends of the upper cantilever rod and the lower cantilever rod;

[0019] The length of the upper cantilever rod is greater than the length of the lower cantilever rod;

[0020] The lower chord fixing support is connected and fixed to one end of the lower cantilever rod close to the existing structural column.

[0021] A further improvement of the large-span cantilever truss system using the torsion-resistant parallel chord truss of the present invention is that a plurality of upper chord fixing supports are provided.

[0022] The beneficial effects of the large-span cantilever truss system using the torsion-resistant parallel chord truss of the present invention are as follows:

[0023] The large-span cantilever truss system of the present invention adopts a torsion-resistant parallel chord truss with torsion resistance, and connects the dislocated force couple formed by the horizontal tension at the upper chord fixed support and the vertical pressure at the lower chord fixed support to form a cantilever system, thereby improving the bending resistance of the cantilever system. All vertical loads of the entire cantilever system are provided by the node of the lower chord fixed support at the existing structural column. The torsion-resistant parallel chord truss is abutted against the existing side beam, and is connected and fixed to the existing side beam through the upper chord fixed support. The existing side beam is used to provide tension for the torsion-resistant parallel chord truss in the horizontal direction, thereby avoiding measures such as reinforcing the existing side beam and setting bending-resistant supports. The setting position of the lower chord fixed support is lower than the connection between the existing structural column and the existing side beam, thereby avoiding the beam connection node of the existing structural column and avoiding the problem of difficulty in planting reinforcement in the core area of ​​the node.

[0024] In the large-span cantilever truss system of the present invention, a vertical adjustment hole is provided on the second connecting member of the upper chord fixed support, and the second connecting member is tightly attached to the first connecting member, so that the second connecting member can transfer the horizontal load of the torsion-resistant parallel chord truss to the first connecting member, but will not transfer the vertical load of the torsion-resistant parallel chord truss to the first connecting member, thereby allowing the existing side beams to provide horizontal support for the torsion-resistant parallel chord truss, and the vertical load of the cantilever truss system is borne by the existing structural columns.

[0025] The large-span cantilever truss system of the present invention has good structural integrity, can meet the needs of overall hoisting, and is easy to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The present invention is a schematic diagram of a three-dimensional structure in which a large-span cantilever truss system using a torsion-resistant parallel chord truss is installed on an existing structure.

[0027] Figure 2 for Figure 1 Top view of the structure shown.

[0028] Figure 3 for Figure 1 Front view of the structure shown.

[0029] Figure 4 for Figure 1 Side view of the structure shown.

[0030] Figure 5 The present invention is a schematic structural diagram of an upper chord fixed support in a large-span cantilever truss system utilizing a torsion-resistant parallel chord truss.

[0031] Figure 6 The diagram is a schematic diagram of the exploded structure of the upper chord fixed support in the large-span cantilever truss system using the torsion-resistant parallel chord truss of the present invention. DETAILED DESCRIPTION

[0032] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0033] See also Figure 1 The present invention provides a large-span cantilever truss system using a torsion-resistant parallel chord truss. Compared with the traditional cantilever structure, the present invention adopts a truss structure to fully utilize the vertical bearing capacity of the existing structural columns. By setting corresponding upper chord fixed supports and lower chord fixed supports on the existing side beams and the existing structural columns, the torsion-resistant parallel chord truss is used to connect the horizontal tension on the existing side beams with the eccentric force couple formed by the vertical pressure on the existing structural columns, so that it can withstand the root bending moment of the cantilever member. The cantilever truss system of the present invention avoids setting fixed supports at the existing structural columns and the existing structural beams, greatly reduces the burden on the existing structural beams, and fully utilizes the safety of the existing structural columns. The upper chord fixed supports and the lower chord fixed supports are arranged in an up-and-down staggered manner, avoiding the difficulty of planting reinforcement in the node core area of ​​the existing structural column. The large-span cantilever truss system of the present invention using a torsion-resistant parallel chord truss is described below in conjunction with the accompanying drawings.

[0034] See also Figure 1 , showing a three-dimensional structural schematic diagram of the present invention using a large-span cantilever truss system of torsion-resistant parallel chord trusses installed on an existing structure. Figure 2 , showing Figure 1 The top view of the structure shown below. Figure 1 and Figure 2 , the large-span cantilever truss system using the torsion-resistant parallel chord truss of the present invention is described.

[0035] like Figure 1 and Figure 2As shown, the large-span cantilever truss system using torsion-resistant parallel chord trusses of the present invention is arranged on the outer side of the existing structural column 11 and the existing side beam 12, and the existing side beam 12 is supported and connected between two adjacent existing structural columns 11. The large-span cantilever truss system of the present invention includes a first cantilever truss 21 and a torsion-resistant parallel chord truss 23, wherein the first cantilever truss 21 is connected to the existing structural column 11, and the first cantilever truss 21 is connected and fixed to the existing structural column 11 through a lower chord fixed support 22, and the position of the lower chord fixed support 22 is lower than the connection between the existing structural column 11 and the existing side beam 12; the torsion-resistant parallel chord truss 22 is supported and connected between two adjacent first cantilever trusses 21, and the torsion-resistant parallel chord truss 22 is arranged at one end of the first cantilever truss 21 close to the existing structural column 11, and the side of the torsion-resistant parallel chord truss 22 is connected and fixed to the existing side beam 12 through an upper chord fixed support 24.

[0036] The number of the first cantilever trusses 21 of the large-span cantilever truss system of the present invention matches the number of existing structural columns 11 on the existing building. The large-span cantilever truss system is designed to expand the building space and improve the facade effect for the existing structure. The large-span cantilever truss system of the present invention fully utilizes the bending and torsion resistance of the three-dimensional truss structure to construct a cantilever space truss system that can meet the requirements of large-span external cantilever.

[0037] The large-span cantilever truss system of the present invention sets the setting position of the lower chord fixed support 22 at a position lower than the connection between the existing structural column 11 and the existing side beam 12. The connection is also the connection between the existing structural column 11 and the existing structural beam 14. The beam-column connection node is a densely arranged steel bar area. Setting a fixed support there is bound to encounter the problem of difficulty in planting steel bars in the core area of ​​the node. The setting position of the lower chord fixed support 22 of the present invention avoids the beam-column connection node on the existing structural column 11, and can avoid the problem of difficulty in planting steel bars in the core area of ​​the node.

[0038] The large-span cantilever truss system of the present invention has a torsion-resistant parallel chord truss with torsion resistance. The torsion-resistant parallel chord truss and two adjacent first cantilever trusses together form a cantilever bending-resistant system, and the overall structural stability is good.

[0039] In a specific embodiment of the present invention, the large-span cantilever truss system of the present invention further includes at least one second cantilever truss 25 arranged outside the torsion-resistant parallel chord truss 23, and a horizontal tie rod 26 is supported and connected between the second cantilever truss 25 and the adjacent first cantilever truss 21.

[0040] The second cantilever truss 25 is provided to reduce the distance between the two first cantilever trusses 21, thereby improving the overall stability of the long-span cantilever truss system.

[0041] Furthermore, more than two second cantilever trusses 25 are provided, and a horizontal tie rod 26 is also supported and connected between two adjacent second cantilever trusses 25 .

[0042] Furthermore, combined with Figure 2 and Figure 3 As shown, there are multiple horizontal tie rods 26. The overall stability of the second cantilever truss and the first cantilever truss is increased by multiple horizontal tie rods 26. Preferably, the ends of the horizontal tie rods 26 on both sides of the second cantilever truss 25 are correspondingly arranged.

[0043] Furthermore, an upper chord fixed support 24 is provided on the torsion-resistant parallel chord truss 23 at a position corresponding to the second cantilever truss 25. There are multiple upper chord fixed supports 24 provided on the side of the torsion-resistant parallel truss 23 close to the existing side beam 12, and the upper chord fixed supports 24 located at both ends of the torsion-resistant parallel truss 23 are provided close to or adjacent to the existing structural column 11.

[0044] Furthermore, the second cantilever truss 25 is arranged at a position corresponding to the position of the existing secondary beam 13 connected to the existing side beam 12. The existing secondary beam is used to improve the ability of the existing side beam to resist lateral tension.

[0045] In a specific embodiment of the present invention, Figure 5 and Figure 6 As shown, the upper chord fixed support 24 includes a first connecting member 241, a second connecting member 242 and a plurality of fastening connecting members 243; a connecting hole 2411 is provided on the first connecting member 241; a vertical adjustment hole 2421 is provided on the second connecting member 242 corresponding to the connecting hole 2411 on the first connecting member 241; the fastening member 243 passes through the corresponding vertical adjustment hole 2421 and the connecting hole 2411, thereby fastening the second connecting member 242 and the first connecting member 241 to the existing side beam 12; the second connecting member 242 is provided with a connecting portion 2422 connected to the torsion-resistant parallel chord truss 23.

[0046] In this way, when setting the upper chord fixed support 24, the first connector 241 and the second connector 242 are installed at the set position of the existing side beam 12 through the fastening connector 243. The fastening connector 243 can be a connector such as an anchor bolt, and the first connector 241 and the second connector 242 are installed by implanting the anchor bolt into the existing side beam 12. The second connector 242 is located on the outside, and the connecting portion 2422 on the second connector 242 is used to connect with the torsion parallel chord truss 23. The second connector 242 can be adjusted vertically relative to the fastening connector 243 and the first connector 241 through the vertical adjustment hole 2421. When the connecting portion 2422 is connected to the torsion parallel chord truss 23, a certain adjustment gap is left between the top of the vertical adjustment hole 2421 on the second connector 242 and the fastening connector 243. The gravity of the large-span cantilever truss system and the vertical load caused by the external force on the large-span cantilever truss system will be transmitted to the existing structural column 11 through the lower chord fixed support 22. The second connecting member 242 will not transmit the vertical load because the top of the vertical adjustment hole 2421 is not in contact with the fastening connecting member 243. The horizontal load of the large-span cantilever truss system can be transmitted to the existing side beam 12 through the second connecting member 242 and the first connecting member 241. The existing side beam 12 bears the horizontal tension, and the existing structural column 11 bears the vertical pressure, which reduces the transmission path of the main bending moment of the large-span cantilever truss system in the existing building structure. The existing secondary beam 13 and the existing floor slab 15 are arranged at the existing side beam 12. The existing secondary beam 13 and the existing floor slab 15 can improve the ability of the existing side beam to resist lateral tension, and can avoid processing the existing convenience and setting anti-bending supports.

[0047] Furthermore, the connecting portion 2422 is a connecting rod, which is connected to the corresponding upper chord rod 231 on the torsion-resistant parallel chord truss 23 , and the connecting position of the connecting rod corresponds to the connecting position of the connecting cross bar 233 connected to the upper chord rod 231 .

[0048] Furthermore, if Figures 1 to 3 As shown, the torsion-resistant parallel chord truss 23 includes a pair of upper chords 231, a pair of lower chords 232, a connecting cross bar 233 supported and connected between the pair of upper chords 231 and between the pair of lower chords 232, a connecting vertical bar 234 supported and connected between the upper chords 231 and the lower chords 232, and a connecting diagonal bar 235 supported and connected between the pair of upper chords 231, between the pair of lower chords 232, and between the upper chords 231 and the lower chords 232; the upper chord fixed support 24 is connected and fixed to the upper chord 231 disposed near the existing side beam 12. The end of the connecting diagonal bar 235 is connected to the end of the adjacent connecting cross bar 233 or the connecting vertical bar 234.

[0049] When the second cantilever truss 25 is arranged, the end of the second cantilever truss 25 is arranged corresponding to the corresponding connecting cross bar 233. Figure 1 As shown, the second cantilever truss 25 includes a first cross bar 251, a second cross bar 252, a vertical bar 253 supported and connected between the first cross bar 251 and the second cross bar 252, a first diagonal bar 254 supported and connected between the cantilevered ends of the first cross bar 251 and the second cross bar 252, and a second diagonal bar 255 supported and connected between the first cross bar 251 and the second cross bar 252, wherein the length of the second cross bar 252 is less than the length of the first cross bar 251, the ends of the first cross bar 251 and the second cross bar 252 are fixedly connected to the upper chord 231 and the lower chord 232 corresponding to the torsion-resistant parallel chord truss 23, the second diagonal bar 255 is obliquely supported and connected between the end of the vertical bar 253 and the corresponding end of the corresponding connecting vertical bar 234, and the first cross bar 251 and the second cross bar 252 are arranged corresponding to the corresponding connecting cross bar 233.

[0050] In a specific embodiment of the present invention, Figure 1 and Figure 4 As shown, the first cantilever truss 21 includes an upper cantilever rod 211, a lower cantilever rod 212, a support vertical rod 213 supported and connected between the upper cantilever rod 211 and the lower cantilever rod 212, a support diagonal rod 214 supported and connected between the upper cantilever rod 211 and the lower cantilever rod 212, and a diagonal brace 215 supported and connected between the cantilever ends of the upper cantilever rod 211 and the lower cantilever rod 212; the length of the upper cantilever rod 211 is greater than the length of the lower cantilever rod 212; the lower chord fixed support 22 is connected and fixed to one end of the lower cantilever rod 212 close to the existing structural column 11. There are multiple support vertical rods 213, and the support diagonal rod 214 is diagonally supported and connected between the corresponding ends of two adjacent support vertical rods 213.

[0051] The horizontal tie rod 26 is supported and connected between the upper cantilever rod 211 and the corresponding first cross rod 251 , and can also be supported and connected between two adjacent first cross rods 251 .

[0052] The lower chord fixed support 22 includes a support plate, which is installed on the existing structural column 11 through a plurality of fixings, which can be anchor bolts, and a fixing portion is provided on the support plate corresponding to the end of the first cantilever truss 21, and the fixing portion is preferably a fixing rod, which is fixedly connected to the end of the second crossbar 251. Alternatively, the second crossbar 251 can be clamped on the fixing rod, and then the end of the second crossbar 251 is welded and fixed to the support plate.

[0053] The installation process of the large-span cantilever truss system using the torsion-resistant parallel chord truss of the present invention is described below.

[0054] The large-span cantilever truss system of the present invention has strong integrity, and the forces on each component are clear. It can be installed by means of on-site assembly + integral hoisting or high-altitude unit assembly. Before installing the large-span cantilever truss system, first install the lower chord fixed support and the upper chord fixed support, then connect and fix the first cantilever truss to the lower limit fixed support, and then successively install the torsion-resistant parallel chord truss, the second cantilever truss and the horizontal tie rod. After completion, the large-span cantilever truss system has the overall bearing capacity, and the load of the enclosure structure can be applied on the upper part.

[0055] The present invention has been described in detail in combination with the accompanying drawings and embodiments. Those of ordinary skill in the art can make various variations of the present invention according to the above description. Therefore, some details in the embodiments should not constitute a limitation to the present invention, and the protection scope of the present invention will be defined by the scope defined in the appended claims.

Claims

1. A long-span cantilever truss system using a torsion-resistant parallel chord truss, which is arranged outside an existing structural column and an existing side beam, wherein the existing side beam is supported and connected between two adjacent existing structural columns, characterized in that: The large-span cantilever truss system comprises: A first cantilever truss connected to an existing structural column, wherein the first cantilever truss is connected and fixed to the existing structural column via a lower chord fixed support, and the position of the lower chord fixed support is lower than the connection between the existing structural column and the existing side beam; A torsion-resistant parallel chord truss is supported and connected between two adjacent first cantilever trusses. The torsion-resistant parallel chord truss is arranged at one end of the first cantilever truss close to the existing structural column. The side of the torsion-resistant parallel chord truss is connected and fixed to the existing side beam through an upper chord fixing support.

2. The long-span cantilever truss system using torsion-resistant parallel chord trusses according to claim 1, characterized in that: It also includes at least one second cantilever truss arranged outside the torsion-resistant parallel chord truss, and a horizontal tie rod is supported and connected between the second cantilever truss and the adjacent first cantilever truss.

3. The long-span cantilever truss system using torsion-resistant parallel chord trusses according to claim 2, characterized in that: An upper chord fixing support is provided on the torsion-resistant parallel chord truss at a position corresponding to the second cantilever truss.

4. The long-span cantilever truss system using torsion-resistant parallel chord trusses according to claim 2, characterized in that: The setting position of the second cantilever truss corresponds to the position of the existing secondary beam connected to the existing side beam.

5. The long-span cantilever truss system using torsion-resistant parallel chord trusses according to claim 2, characterized in that: The horizontal tie rods are multiple.

6. The long-span cantilever truss system using torsion-resistant parallel chord trusses according to claim 1, characterized in that: The upper chord fixing support comprises a first connecting member, a second connecting member and a plurality of fastening connecting members; the first connecting member is provided with a connecting hole; the second connecting member is provided with a vertical adjustment hole corresponding to the connecting hole on the first connecting member; The fastener is provided with corresponding vertical adjustment holes and connection holes, so as to fasten the second connection member and the first connection member to the existing side beam; The second connecting member is provided with a connecting portion connected to the torsion-resistant parallel chord truss.

7. The long-span cantilever truss system using torsion-resistant parallel chord trusses according to claim 6, characterized in that: The connecting portion is a connecting rod, which is connected to the corresponding upper chord rod on the torsion-resistant parallel chord truss, and the connecting position of the connecting rod corresponds to the connecting position of the connecting cross bar connected to the upper chord rod.

8. The long-span cantilever truss system using torsion-resistant parallel chord trusses according to claim 1, characterized in that: The torsion-resistant parallel chord truss includes a pair of upper chords, a pair of lower chords, a connecting crossbar supported and connected between the pair of upper chords and between the pair of lower chords, a connecting vertical bar supported and connected between the opposite upper chords and lower chords, and a connecting diagonal bar supported and connected between the pair of upper chords, between the pair of lower chords, and between the opposite upper chords and lower chords; The upper chord fixing support is connected and fixed to an upper chord rod arranged close to the existing side beam.

9. The long-span cantilever truss system using torsion-resistant parallel chord trusses according to claim 1, characterized in that: The first cantilever truss comprises an upper cantilever rod, a lower cantilever rod, a support vertical rod supported and connected between the upper cantilever rod and the lower cantilever rod, a support diagonal rod supported and connected between the upper cantilever rod and the lower cantilever rod, and a diagonal brace supported and connected between the cantilever ends of the upper cantilever rod and the lower cantilever rod; The length of the upper cantilever rod is greater than the length of the lower cantilever rod; The lower chord fixing support is connected and fixed to one end of the lower cantilever rod close to the existing structural column.

10. The long-span cantilever truss system using torsion-resistant parallel chord trusses according to claim 1, characterized in that: The upper chord fixing supports are provided in plurality.

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