Steel structure pipe truss and construction method thereof

Abstract

The invention relates to a steel structure pipe truss and a construction method thereof, and belongs to the technical field of steel structure installation and construction. A split structure formed by splicing two pipe truss single members is adopted, and each pipe truss single member comprises a chord member A, a chord member B, a chord member C, a first web member connected between the chord member A and the chord member B, a second web member connected between the chord member A and the chord member C and a third web member connected between the chord member B and the chord member C, the two adjacent groups of chord members B and the two adjacent groups of chord members C are detachably connected through bolts and are detachably connected with the upper-layer support, and the two adjacent groups of chord members A are detachably connected through the bottom-layer support. Compared with the prior art, the pipe truss has the following beneficial effects that through the up-down cooperative design, the stability of the connecting position of the steel structure pipe truss can be effectively improved, it is guaranteed that the overall steel structure formed by splicing the two pipe truss single components has higher structural strength, and therefore the using effect of the overall steel structure is improved.

Description

Technical Field

[0001] The present invention relates to a steel structure pipe truss and its construction method, belonging to the technical field of steel structure installation construction. Background Art

[0002] The members of a steel structure pipe truss mainly bear axial tension or compression, and the force is transmitted through triangular units. It has the characteristics of high material utilization rate, light self-weight, and large stiffness, so it is widely used. At present, the connection methods of steel structure pipe trusses are mainly divided into three forms: welding, bolt connection, and hybrid connection.

[0003] The patent with the patent number 202421166447.1 discloses a steel structure pipe truss connection structure, belonging to the technical field of pipe truss production. It includes an upper connecting pipe. A guiding sliding column A and a guiding sliding column B are vertically connected in the middle of the upper connecting pipe at intervals. One end of the left lower connecting pipe is provided with a first sliding sleeve that cooperates with the guiding sliding column A for sliding. A spacing adjustment link A is arranged in the middle of the left lower connecting pipe. The other end of the spacing adjustment link A is fixedly connected to the upper connecting pipe. One end of the right lower connecting pipe is provided with a second sliding sleeve that cooperates with the guiding sliding column B for sliding. A spacing adjustment link B is arranged in the middle of the right lower connecting pipe. The other end of the spacing adjustment link B is fixedly connected to the upper connecting pipe.

[0004] Although the above patent can achieve the connection function of the steel structure pipe truss, the current technology has incomplete considerations and has the following drawbacks: When the two groups of pipe truss single components are connected and installed at present, connection components are required at the connection positions to ensure the stability of the structure formed by the steel structure pipe truss. However, the existing connection components have problems of insufficient stability. To solve one of the above problems, there is an urgent need for a steel structure pipe truss and its construction method. Summary of the Invention

[0005] According to the deficiencies in the above prior art, the technical problem to be solved by the present invention is: How to achieve the design requirements of up-and-down coordination, effectively improve the stability of the connection position of the steel structure pipe truss, ensure that the overall steel structure composed of two pipe truss single components has stronger structural strength, and thus improve the use effect of the overall steel structure. For this purpose, a steel structure pipe truss and its construction method are provided.

[0006] The steel structure pipe truss described in the present invention adopts a split structure composed of two single pipe truss members spliced together, and is characterized in that: it further includes a single member connecting piece for connecting adjacent single pipe truss members. The single member connecting piece includes a vertically arranged column support, on the top of the column support is installed an upper layer support, and on the upper part of the column support is installed a bottom layer support. The single pipe truss member includes parallel chord A, chord B, chord C, a first web member connected between chord A and chord B, a second web member connected between chord A and chord C, and a third web member connected between chord B and chord C. Adjacent two groups of the chord B and adjacent two groups of the chord C are detachably connected by bolts and are both detachably connected to the upper layer support, and adjacent two groups of the chord A are detachably connected by the bottom layer support. The adjacent two groups of the chord B and adjacent two groups of the chord C are detachably connected by bolts and are both detachably connected to the upper layer support, and adjacent two groups of the chord A are detachably connected by the bottom layer support. Through this design of coordinating up and down, the stability of the connection position of the steel structure pipe truss can be effectively improved, ensuring that the overall steel structure composed of two single pipe truss members spliced together has stronger structural strength, thereby improving the use effect of the overall steel structure.

[0007] Preferably, the bottom layer support includes a left connection head and a right connection head symmetrically arranged on the left and right sides of the column support. On the left connection head and the right connection head are respectively provided a left connection flange A and a right connection flange A for connecting with the corresponding chord A. On both sides of the column support are also symmetrically arranged a left inclined support and a right inclined support. The upper ends of the left inclined support and the right inclined support are respectively connected to the corresponding chord A through a left pipe hoop and a right pipe hoop. In the middle of the left inclined support is connected a left strengthening support, and the other end of the left strengthening support is connected to the column support. In the middle of the right inclined support is connected a right strengthening support, and the other end of the right strengthening support is connected to the column support. The bottom ends of the left inclined support and the right inclined support are respectively connected to a left horizontal support and a right horizontal support, and the left horizontal support and the right horizontal support are respectively welded and fixed on both sides of the column support.

[0008] Preferably, the left inclined support is respectively welded and connected to the left strengthening support and the left horizontal support, and the right inclined support is respectively welded and connected to the right strengthening support and the right horizontal support.

[0009] Preferably, the upper layer support includes a front inclined support and a rear inclined support symmetrically arranged on both sides of the column support. The upper end of the front inclined support is connected to a front horizontal support, and the bottom end of the front inclined support is connected to the corresponding chord B through a front pipe hoop. The upper end of the rear inclined support is connected to a rear horizontal support, and the bottom end of the rear inclined support is connected to the corresponding chord C through a rear pipe hoop.

[0010] Preferably, the left horizontal support and the right horizontal support are symmetrically arranged on both sides of the column support, and are both welded to the column support. The front horizontal support and the rear horizontal support are symmetrically arranged on both sides of the column support, and are both welded to the column support.

[0011] Preferably, the front pipe hoop includes a first half hoop and a second half hoop arranged oppositely. One end of the first half hoop is detachably connected to one end of the second half hoop through a locking bolt one, and the other end of the first half hoop is detachably connected to the other end of the second half hoop through a locking bolt two. The front inclined support is fixedly connected to the first half hoop, and a front reinforcing rib plate is arranged between the first half hoop and the front inclined support. The rear pipe hoop includes a third half hoop and a fourth half hoop arranged oppositely. One end of the third half hoop is detachably connected to one end of the fourth half hoop through a locking bolt three, and the other end of the third half hoop is detachably connected to the other end of the fourth half hoop through a locking bolt four. The rear inclined support is fixedly connected to the third half hoop, and a rear reinforcing rib plate is arranged between the third half hoop and the rear inclined support.

[0012] Preferably, the connection points between adjacent chord bars B and the connection points between the connected chord bars C are arranged staggeredly.

[0013] Preferably, connection flanges C, connection flanges D, and connection flanges E are respectively arranged on the chord bar A, the chord bar B, and the chord bar C. The connection flanges C on adjacent two groups of chord bars A are respectively connected to the left connection flange A and the right connection flange A through corresponding connection bolts. The connection flanges C on adjacent two groups of chord bars B are connected through corresponding connection bolts. The connection flanges D on adjacent two groups of chord bars B are connected through corresponding connection bolts.

[0014] Preferably, a reinforcing rib plate C is arranged between the connection flange C and the chord bar A. A plurality of the reinforcing rib plates C are arranged around the center line of the chord bar A, and the included angles between adjacent ones are equal.

[0015] For the construction method of the steel structure pipe truss, the column support is supported on the ground, and the bottom support and the upper support are installed on the column support. The adjacent two groups of pipe truss single-member components are fixedly connected by using the bottom support and the upper support. The connection flanges C on adjacent two groups of chord bars A are respectively connected to the left connection flange A and the right connection flange A through corresponding connection bolts. The connection flanges C on adjacent two groups of chord bars B are connected through corresponding connection bolts. The connection flanges D on adjacent two groups of chord bars B are connected through corresponding connection bolts. Finally, the chord bar A is fixed again by using the left pipe hoop and the right pipe hoop, and the chord bars B and C are respectively fixed by using the front pipe hoop and the rear pipe hoop.

[0016] Compared with the prior art, the present invention has the following beneficial effects: For the steel structure pipe truss and its construction method of the present invention, two adjacent groups of the chord B and two adjacent groups of the chord C are detachably connected by bolts and are both detachably connected to the upper support. Two adjacent groups of the chord A are detachably connected by the bottom support. Through this up-and-down collaborative design, the stability of the connection position of the steel structure pipe truss can be effectively improved, ensuring that the overall steel structure composed of two single pipe truss members has stronger structural strength, thereby improving the use effect of the overall steel structure.

[0017] For the steel structure pipe truss and its construction method of the present invention, the bottom support and the upper support are used to fixedly connect two adjacent groups of single pipe truss members; the connecting flanges C on two adjacent groups of the chord A are respectively connected to the left connecting flange A and the right connecting flange A through corresponding connecting bolts. The connecting flanges C on two adjacent groups of the chord B are connected through corresponding connecting bolts. The connecting flanges D on two adjacent groups of the chord B are connected through corresponding connecting bolts. Finally, the left pipe hoop and the right pipe hoop are used to fix the chord A again, and the front pipe hoop and the rear pipe hoop are used to fix the chord B and the chord C respectively, so as to be convenient, fast, safe and reliable during construction and installation; and it is easy to control the quality and ensure the structural safety.

[0018] For the steel structure pipe truss and its construction method of the present invention, the connection points between the adjacent chord B and the connection points between the connected chord C are arranged staggeredly, the load distribution is more uniform, and stress concentration is avoided. Brief Description of the Drawings

[0019] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0020] Figure 1 It is the front view of the present invention; Figure 2 It is the side view of the present invention; Figure 3 It is the structural diagram of the bottom support; Figure 4 It is the structural diagram of the upper support.

[0021] In the figure: 1. Chord bar A; 2. Chord bar B; 3. Chord bar C; 4. Column support; 5. Bottom support; 5.1 Left connection head; 5.2 Right connection head; 5.3 Left connection flange A; 5.3 Right connection flange A; 5.5 Left diagonal support; 5.6 Right diagonal support; 5.7 Left strengthening support; 5.8 Right strengthening support; 5.9 Left horizontal support; 5.10 Right horizontal support; 5.11 Left pipe hoop; 5.12 Right pipe hoop; 6. Upper support; 6.1 Front horizontal support; 6.2 Rear horizontal support; 6.3 Front diagonal support; 6.4 Front strengthening support; 6.5 Rear diagonal support; 6.6 Rear strengthening support; 6.7 Front pipe hoop; 6.8 Rear pipe hoop; 6.9 Front reinforcing rib plate; 6.10 Rear reinforcing rib plate; 7. First web member; 8. Second web member; 9. Third web member; 10. Third semi-holding ring; 11. Fourth semi-holding ring. Detailed implementation mode

[0022] The present invention will be further described below with reference to the accompanying drawings: The following further illustrates the present invention through specific embodiments, but is not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

[0023] Example 1, as Figure 1-2 shown, the steel structure pipe truss is a split structure composed of two pipe truss single-member components spliced together, and further includes a single-member connector for connecting adjacent pipe truss single-member components. The single-member connector includes a vertically arranged column support 4. An upper support 6 is installed at the top of the column support 4, and a bottom support 5 is installed at the upper part of the column support 4. The pipe truss single-member component includes parallel chord bars A1, B2, and C3 and a first web member 7 connected between chord bars A1 and B2, a second web member 8 connected between chord bars A1 and C3, and a third web member 9 connected between chord bars B2 and C3. Adjacent two groups of the chord bars B2 and adjacent two groups of the chord bars C3 are detachably connected by bolts and are both detachably connected to the upper support 6. Adjacent two groups of the chord bars A1 are detachably connected by the bottom support 5.

[0024] The adjacent two groups of the chord bars B2 and adjacent two groups of the chord bars C3 are detachably connected by bolts and are both detachably connected to the upper support 6. Adjacent two groups of the chord bars A1 are detachably connected by the bottom support 5. Through this up-and-down coordinated design, the stability of the connection position of the steel structure pipe truss can be effectively improved, ensuring that the overall steel structure composed of two pipe truss single-member components has stronger structural strength, thereby improving the use effect of the overall steel structure.

[0025] Example 2, asFigure 1-2 As shown, the steel structure pipe truss is a split structure composed of two spliced pipe truss single components, and further includes a single connector for connecting adjacent pipe truss single components. The single connector includes a vertically arranged column support 4, on the top of which an upper support 6 is installed, and on the upper part of which a bottom support 5 is installed. The pipe truss single component includes parallel chord bars A1, chord bars B2, chord bars C3, a first web member 7 connected between chord bars A1 and chord bars B2, a second web member 8 connected between chord bars A1 and chord bars C3, and a third web member 9 connected between chord bars B2 and chord bars C3. Adjacent two groups of the chord bars B2 and adjacent two groups of the chord bars C3 are detachably connected by bolts and are both detachably connected to the upper support 6, and adjacent two groups of the chord bars A1 are detachably connected by the bottom support 5.

[0026] Further, referring to Figure 3 , the bottom support 5 includes a left connection head 5.1 and a right connection head 5.2 symmetrically arranged on the left and right sides of the column support 4. On the left connection head 5.1 and the right connection head 5.2, there are respectively arranged a left connection flange A5.3 and a right connection flange A5.4 connected to the corresponding chord bar A1. On both sides of the column support 4, there are also symmetrically arranged a left inclined support 5.5 and a right inclined support 5.6. The upper ends of the left inclined support 5.5 and the right inclined support 5.6 are respectively connected to the corresponding chord bar A1 through a left pipe hoop 5.11 and a right pipe hoop 5.12. In the middle of the left inclined support 5.5, a left strengthening support 5.7 is connected, and the other end of the left strengthening support 5.7 is connected to the column support 4. In the middle of the right inclined support 5.6, a right strengthening support 5.8 is connected, and the other end of the right strengthening support 5.8 is connected to the column support 4. The bottom ends of the left inclined support 5.5 and the right inclined support 5.6 are respectively connected to a left horizontal support 5.9 and a right horizontal support 5.10, and the left horizontal support 5.9 and the right horizontal support 5.10 are respectively welded and fixed on both sides of the column support 4.

[0027] Further, the left inclined support 5.5 is respectively welded and connected to the left strengthening support 5.7 and the left horizontal support 5.9, and the right inclined support 5.6 is respectively welded and connected to the right strengthening support 5.8 and the right horizontal support 5.10.

[0028] Further, referring to Figure 4, the upper support 6 includes a front inclined support 6.3 and a rear inclined support 6.5 symmetrically arranged on both sides of the column support 4. The upper end of the front inclined support 6.3 is connected to the front horizontal support 6.1, and the bottom end of the front inclined support 6.3 is connected to the corresponding chord B2 through a front pipe clamp 6.7. The upper end of the rear inclined support 6.5 is connected to the rear horizontal support 6.2, and the bottom end of the rear inclined support 6.5 is connected to the corresponding chord C3 through a rear pipe clamp 6.8.

[0029] Further, the left horizontal support 5.9 and the right horizontal support 5.10 are symmetrically arranged on both sides of the column support 4 and are both welded to the column support 4. The front horizontal support 6.1 and the rear horizontal support 6.2 are symmetrically arranged on both sides of the column support 4 and are both welded to the column support 4.

[0030] Further, the front pipe clamp 6.7 includes a first half hoop and a second half hoop arranged oppositely. One end of the first half hoop is detachably connected to one end of the second half hoop through a locking bolt one, and the other end of the first half hoop is detachably connected to the other end of the second half hoop through a locking bolt two. The front inclined support 6.3 is fixedly connected to the first half hoop, and a front reinforcing rib plate 6.9 is arranged between the first half hoop and the front inclined support 6.3. The rear pipe clamp 6.8 includes a third half hoop 10 and a fourth half hoop 11 arranged oppositely. One end of the third half hoop is detachably connected to one end of the fourth half hoop through a locking bolt three, and the other end of the third half hoop is detachably connected to the other end of the fourth half hoop through a locking bolt four. The rear inclined support 6.5 is fixedly connected to the third half hoop, and a rear reinforcing rib plate 6.10 is arranged between the third half hoop and the rear inclined support 6.5.

[0031] Further, the connection points between adjacent chord B2s and the connection points between the connected chord C3s are arranged staggeredly.

[0032] Further, connection flanges C, D, and E are respectively arranged on the chord A1, chord B2, and chord C3. The connection flanges C on adjacent two groups of chord A1s are respectively connected to the left connection flange A5.3 and the right connection flange A5.4 through corresponding connection bolts. The connection flanges C on adjacent two groups of chord B2s are connected through corresponding connection bolts. The connection flanges D on adjacent two groups of chord B2s are connected through corresponding connection bolts.

[0033] Further, a reinforcing rib plate C is arranged between the connection flange C and the chord A1.

[0034] Further, a plurality of reinforcing rib plates C are arranged around the center line of the chord A1, and the included angles between adjacent ones are equal.

[0035] Embodiment 3, the construction method of the steel structure pipe truss. The column support 4 is supported on the ground, and the bottom support 5 and the upper support 6 are installed on the column support 4. The adjacent two groups of pipe truss single-member components are fixedly connected by using the bottom support 5 and the upper support 6. The connecting flanges C on the adjacent two groups of chord members A1 are respectively connected to the left connecting flange A5.3 and the right connecting flange A5.4 through corresponding connecting bolts. The connecting flanges C on the adjacent two groups of chord members B2 are connected through corresponding connecting bolts. The connecting flanges D on the adjacent two groups of chord members B2 are connected through corresponding connecting bolts. Finally, the chord member A1 is fixed again by using the left pipe hoop 5.11 and the right pipe hoop 5.12, and the chord members B2 and C3 are respectively fixed by using the front pipe hoop 6.7 and the rear pipe hoop 6.8.

[0036] For the steel structure pipe truss and its construction method of the present invention, the adjacent two groups of the chord members B and the adjacent two groups of the chord members C are detachably connected by bolts, and are both detachably connected to the upper support. The adjacent two groups of the chord members A are detachably connected by the bottom support. Through this up-and-down collaborative design, the stability of the connection position of the steel structure pipe truss can be effectively improved, ensuring that the overall steel structure composed of two pipe truss single-member components has stronger structural strength, thereby improving the use effect of the overall steel structure.

[0037] For the steel structure pipe truss and its construction method of the present invention, the adjacent two groups of pipe truss single-member components are fixedly connected by using the bottom support and the upper support. The connecting flanges C on the adjacent two groups of chord members A are respectively connected to the left connecting flange A and the right connecting flange A through corresponding connecting bolts. The connecting flanges C on the adjacent two groups of chord members B are connected through corresponding connecting bolts. The connecting flanges D on the adjacent two groups of chord members B are connected through corresponding connecting bolts. Finally, the chord member A is fixed again by using the left pipe hoop and the right pipe hoop, and the chord members B and C are respectively fixed by using the front pipe hoop and the rear pipe hoop, so that the construction and installation are convenient, fast, safe and reliable; and the quality is easy to control, ensuring structural safety.

[0038] For the steel structure pipe truss and its construction method of the present invention, the connection points between the adjacent chord members B and the connection points between the connected chord members C are arranged staggeredly, so that the load distribution is more uniform and stress concentration is avoided.

[0039] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

[0040] Matters not described in detail in the present invention are well-known techniques to those skilled in the art.

Claims

1. A steel structure tube truss, which is a split structure formed by splicing two tube truss monomer components, characterized in that: It also includes a monomer connector for connecting adjacent tube truss monomer components together, the monomer connector includes a vertically arranged column support, the top of the column support is installed with an upper support, the upper part of the column support is installed with a bottom support, the tube truss monomer component includes a chord A, a chord B, a chord C parallel to each other, and a first web connected between the chord A and the chord B, a second web connected between the chord A and the chord C, and a third web connected between the chord B and the chord C. Two adjacent groups of the chord B and two adjacent groups of the chord C are detachably connected by bolts and are both detachably connected to the upper support, and two adjacent groups of the chord A are detachably connected through the bottom support.

2. The steel structure tube truss according to claim 1, characterized in that: The bottom support includes a left connecting head and a right connecting head symmetrically arranged on the left and right sides of the column support, and the left connecting head and the right connecting head are respectively provided with a left connecting flange A and a right connecting flange A connected to the corresponding chord A. The two sides of the column support are also symmetrically provided with a left oblique support and a right oblique support, and the upper ends of the left oblique support and the right oblique support are respectively connected to the corresponding chord A through a left pipe clamp and a right pipe clamp, the middle part of the left oblique support is connected to a left reinforcing support, and the other end of the left reinforcing support is connected to the column support, the middle part of the right oblique support is connected to a right reinforcing support, and the other end of the right reinforcing support is connected to the column support, the bottom ends of the left oblique support and the right oblique support are respectively connected to a left horizontal support and a right horizontal support, and the left horizontal support and the right horizontal support are respectively welded and fixed on both sides of the column support.

3. The steel structure tube truss according to claim 2, characterized in that: The left side oblique support is respectively connected to the left side reinforcing support and the left side horizontal support by welding, and the right side oblique support is respectively connected to the right side reinforcing support and the right side horizontal support by welding.

4. The steel structure tube truss according to claim 3, characterized in that: The upper support includes a front oblique support and a rear oblique support symmetrically arranged on both sides of the column support, the upper end of the front oblique support is connected to the front horizontal support, the bottom end of the front oblique support is connected to the corresponding chord B through the front pipe clamp, the upper end of the rear oblique support is connected to the rear horizontal support, and the bottom end of the rear oblique support is connected to the corresponding chord C through the rear pipe clamp.

5. The steel structure tube truss according to claim 4, characterized in that: The left side horizontal support and the right side horizontal support are symmetrically arranged on both sides of the column support and are both welded to the column support. The front side horizontal support and the rear side horizontal support are symmetrically arranged on both sides of the column support and are both welded to the column support.

6. The steel structure tube truss according to claim 5, characterized in that: The front pipe clamp includes a first half ring and a second half ring which are arranged opposite to each other, one end of the first half ring is detachably connected to one end of the second half ring by a locking bolt 1, and the other end of the first half ring is detachably connected to the other end of the second half ring by a locking bolt 2, the front oblique support is fixedly connected to the first half ring, and a front reinforcing rib plate is arranged between the first half ring and the front oblique support; the rear pipe clamp includes a third half ring and a fourth half ring which are arranged opposite to each other, one end of the third half ring is detachably connected to one end of the fourth half ring by a locking bolt 3, and the other end of the third half ring is detachably connected to the other end of the fourth half ring by a locking bolt 4, the rear oblique support is fixedly connected to the third half ring, and a rear reinforcing rib plate is arranged between the third half ring and the rear oblique support.

7. The steel structure tube truss according to claim 6, characterized in that: The connection points between adjacent chord bars B and the connection points between connected chord bars C are arranged alternately.

8. The steel structure tube truss according to claim 7, characterized in that: The chord A, chord B and chord C are respectively provided with connecting flanges C, connecting flanges D and connecting flanges E. The connecting flanges C on two adjacent groups of chords A are respectively connected to the left connecting flange A and the right connecting flange A through corresponding connecting bolts, the connecting flanges C on two adjacent groups of chords B are connected through corresponding connecting bolts, and the connecting flanges D on two adjacent groups of chords B are connected through corresponding connecting bolts.

9. The steel structure tube truss according to claim 8, characterized in that: A reinforcing rib plate C is provided between the connecting flange C and the chord rod A. A plurality of reinforcing rib plates C are arranged around the center line of the chord rod A, and the included angles between two adjacent reinforcing rib plates are equal.

10. A construction method for a steel structure tube truss, characterized in that: The column support is supported on the ground, and the bottom support and the upper support are installed on the column support, and the bottom support and the upper support are used to fix and connect two adjacent groups of pipe truss monomer components; the connecting flanges C on the two adjacent groups of chord rods A are respectively connected to the left connecting flange A and the right connecting flange A through corresponding connecting bolts, the connecting flanges C on the two adjacent groups of chord rods B are connected through corresponding connecting bolts, and the connecting flanges D on the two adjacent groups of chord rods B are connected through corresponding connecting bolts, and finally the chord rod A is fixed again by the left pipe hoop and the right pipe hoop, and the chord rod B and the chord rod C are fixed by the front pipe hoop and the rear pipe hoop respectively.

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