阅读说明：本技术 蝴蝶型张弦梁-不锈钢管混凝土屋架结构体系及施工方法 (Butterfly type beam string-stainless steel tube concrete roof truss structure system and construction method ) 是由 王志滨 戴鸿伟 王巧艺 林万福 于 2021-08-27 设计创作，主要内容包括：本发明涉及一种蝴蝶型张弦梁-不锈钢管混凝土屋架结构体系及施工方法,包括蝴蝶型张弦梁、不锈钢管混凝土柱。蝴蝶型张弦梁包括2条交叉设置的上弦CFRP拉索、多功能连接件、下弦杆、通孔连接件、腹杆、槽型檩条,多功能连接件设置在蝴蝶型张弦梁中部；上弦CFRP拉索穿设多功能连接件,上弦CFRP拉索外端与不锈钢管混凝土柱内预埋的拉索锚具锚固,下弦杆上端采用螺栓连接多功能连接件,下端采用螺栓连接不锈钢管混凝土柱；上弦CFRP拉索上间隔安装若干个通孔连接件,每个通孔连接件下设置一个腹杆,腹杆上端与通孔连接件下端相连,腹杆下端与下弦杆相连；每个通孔连接件上设置一个槽型檩条,槽型檩条与通孔连接件上端采用螺栓相连。(The invention relates to a butterfly type beam string structure-stainless steel tube concrete roof truss structure system and a construction method. The butterfly type beam string comprises 2 crossed upper string CFRP guys, multifunctional connecting pieces, lower chord members, through hole connecting pieces, web members and groove-shaped purlines, wherein the multifunctional connecting pieces are arranged in the middle of the butterfly type beam string; the multifunctional connecting piece is penetrated through by the upper chord CFRP inhaul cable, the outer end of the upper chord CFRP inhaul cable is anchored with an inhaul cable anchorage device pre-embedded in the stainless steel pipe concrete column, the multifunctional connecting piece is connected with the upper end of the lower chord through a bolt, and the stainless steel pipe concrete column is connected with the lower end of the lower chord through a bolt; a plurality of through hole connecting pieces are arranged on the upper chord CFRP stay cable at intervals, a web member is arranged below each through hole connecting piece, the upper end of each web member is connected with the lower end of the through hole connecting piece, and the lower end of each web member is connected with the lower chord member; and each through hole connecting piece is provided with a groove-shaped purline, and the groove-shaped purlines are connected with the upper ends of the through hole connecting pieces through bolts.)

1. The utility model provides a string roof beam is opened to butterfly type-stainless steel pipe concrete roof truss structure system, includes that the string roof beam is opened to butterfly type, nonrust steel core concrete column, its characterized in that: the butterfly type beam string comprises an upper string CFRP inhaul cable, a multifunctional connecting piece, a lower string rod, a through hole connecting piece, a web member and a groove-shaped purline, wherein the multifunctional connecting piece is arranged in the middle of the butterfly type beam string;

two upper chord CFRP inhaul cables are arranged in a crossed mode, a multifunctional connecting piece penetrates through the upper chord CFRP inhaul cables, the outer ends of the upper chord CFRP inhaul cables are anchored with inhaul cable anchorage devices pre-embedded in the stainless steel tube concrete column, the included angle range of the upper chord CFRP inhaul cables and the horizontal plane is between 5 degrees and 10 degrees, and the horizontal height of the middle parts of the two crossed upper chord CFRP inhaul cables is lower than that of the anchoring ends;

two lower chords are arranged below two ends of each upper chord CFRP inhaul cable, the lower chords are steel pipe concrete poles, the upper ends of the lower chords are connected with a multifunctional connecting piece through bolts, the lower ends of the lower chords are connected with support node plates welded on the stainless steel pipe concrete columns through bolts, and the included angle between each lower chord and the horizontal plane ranges from 20 degrees to 35 degrees;

two stay cable through holes for the upper chord CFRP stay cable to pass through are formed in the upper portion of the multifunctional connecting piece at intervals from top to bottom, mid-span gusset plates for connecting the chord members are mounted below two ends of the through holes in the lower portion of the multifunctional connecting piece, the two stay cable through holes and the four support gusset plates are arranged according to the cross angle of the butterfly-shaped string beam, and the cross angle ranges from 45 degrees to 60 degrees;

a plurality of through hole connecting pieces are arranged on the upper chord CFRP inhaul cable at intervals, a web member is arranged below each through hole connecting piece, the upper end of each web member is connected with the lower end of each through hole connecting piece through a bolt, and the lower end of each web member is connected with the lower chord through a welding line; and each through hole connecting piece is provided with a groove-shaped purline, and the groove-shaped purlines are connected with the upper ends of the through hole connecting pieces through bolts.

2. The butterfly beam string-stainless steel tube concrete roof truss structural system of claim 1, wherein: the steel pipe concrete pole comprises a stainless steel pipe body, and light foam concrete is filled in the stainless steel pipe body.

3. The butterfly beam string-stainless steel tube concrete roof truss structural system of claim 1, wherein: stainless steel core concrete column is compound stainless steel core concrete column, including stainless steel's outer steel pipe, set up the interior steel pipe of the carbon steel material in outer steel pipe, pours self-compaction concrete in the outer steel pipe, has seted up concrete flow through hole on the interior steel pipe, has all seted up cable ground tackle prefabricated hole on interior steel pipe, the outer steel pipe.

4. The butterfly beam string-stainless steel tube concrete roof truss structural system of claim 3, wherein: the height distance between the upper and lower adjacent concrete flow holes is 1.5 times of the diameter of the inner steel pipe, and the aperture is 1/4 of the diameter of the inner steel pipe.

5. The butterfly beam string-stainless steel tube concrete roof truss structural system of claim 1, wherein: the multifunctional connecting piece, the stay cable anchorage device, the support gusset plate, the web member, the groove-shaped purline and the bolt are all made of stainless steel materials, the upper chord CFRP stay cable is made of carbon fiber materials, and the through hole connecting piece is made of aluminum alloy.

6. A construction method of a butterfly type beam string-stainless steel tube concrete roof truss structure system, which adopts the butterfly type beam string beam-stainless steel tube concrete roof truss structure system of claim 1, and is characterized by comprising the following steps:

step 1: the prefabricated part: prefabricating an upper chord CFRP stay cable, a lower chord member, a web member, a multifunctional connecting piece, inner and outer steel pipes of a stainless steel pipe concrete column, a stay cable anchorage, a support node plate, a through hole connecting piece and a groove-shaped purline in a factory according to a design drawing; welding the web members on the lower chord members; welding a support node plate on an outer steel tube of the stainless steel tube concrete column; transporting the prefabricated part to a construction site;

step 2: constructing the stainless steel tube concrete column: determining the installation position of each stainless steel tube concrete column on the site according to a construction drawing; firstly, installing an inner steel pipe, and then installing an outer steel pipe; penetrating the stay cable anchorage device to the outside of the pipe from the stay cable anchorage device preformed holes of the inner steel pipe and the outer steel pipe, so that the tail part of the big end of the stay cable anchorage device clamps the inner wall of the inner steel pipe; then pouring self-compacting concrete into the steel pipe; repeating the processes until all the steel pipe concrete columns are processed;

and step 3: install chord member, multi-functional connecting piece and through-hole connecting piece down: when the strength of concrete in the stainless steel tube concrete column reaches a design value, a butterfly-shaped beam string is installed, and four lower chord members are connected with the multifunctional connecting piece on the ground through high-strength bolts; mounting the through hole connecting piece on the top of the web member; then, hoisting the steel pipe concrete column to a specified height by using a hoisting crane, and connecting the lower end of the lower chord to a support node plate of the steel pipe concrete column by using a high-strength bolt; then, a temporary support is built below the multifunctional connecting piece, and then a lifting rope of the hoisting crane is loosened;

and 4, step 4: installing and tensioning an upper chord CFRP inhaul cable: at the temporary support position, an upper chord CFRP cable passes through a cable through hole at the upper part of the multifunctional connecting piece and a plurality of through hole connecting pieces at two sides; then, connecting the outer end of the upper chord CFRP stay cable with a stay cable anchorage pre-embedded on the top of the stainless steel tube concrete column, and then tensioning to 100% of the design value of the cable force; then, repeating the steps to install another CFRP inhaul cable and tensioning to 100% of the designed cable force value; repeating the steps until all the butterfly-shaped beam string opening beams are installed;

and 5: installation of groove-shaped purlines: the method comprises the following steps of (1) forming bolt threaded holes at positions corresponding to a groove-shaped purlin lower flange and a through hole connecting piece, hoisting the purlins to the corresponding through hole connecting pieces by using a hoisting crane, and fixing the purlins on the through hole connecting pieces by using bolts; then installing a glass roof or a stainless steel composite plate roof on the purline; and finally, removing the temporary support.

Technical Field

The invention relates to a butterfly beam string-stainless steel tube concrete roof truss structure system and a construction method.

Background

The beam string structure is a self-balancing system consisting of a rigid upper beam string, a lower flexible cable and a middle web member, and the steel tube concrete column is a vertical stressed structure formed by filling concrete in a steel tube. The beam string structure system is simple, the stress is clear, and the advantages of rigid and flexible materials can be fully exerted; the steel pipe concrete can improve the bearing capacity, the ductility and the shock resistance of the member through steel pipe restraint.

However, the existing beam string structure and steel pipe concrete structure have the following defects: (1) the beam string structure and the steel tube concrete column are used for large-span open spaces such as train stations and the like, so that the serious durability problem exists, and the railway transportation is greatly influenced due to the fact that the buildings cannot be stopped for long-time maintenance. (2) The compression member of the beam string structure is generally made of steel, and has larger section and larger steel consumption. (3) The large-span beam string structure cannot bear the reverse load effect, the existing large-span beam string structure is often applied to a light roof, and once the reverse wind load effect or the internal air pressure effect exists, the large-span beam string structure becomes very fragile. Therefore, the general beam string structure is provided with the wind-resistant guy cable or the counterweight, which increases the construction difficulty of the building on one hand and causes the limited use space or the increased cost of the structure on the other hand. (4) The beam string structure is mostly arranged in the transverse direction of the building, the longitudinal direction completely depends on purlines and rigid tie bars to form a stable space structure, and the longitudinal rigidity is poor. (5) The upper chord of the existing beam string structure is mostly connected by box beams, segmented assembly and butt joint are required to be completed at high altitude, and a plurality of jig supports are required to be erected for completion, so that the construction period is long, and the construction process difficulty is high.

Disclosure of Invention

Aiming at the defects, the invention provides a detachable butterfly beam string-stainless steel tube concrete roof truss structure system with convenient and quick construction and a construction method thereof in order to overcome the defects that the beam string structure and the steel tube concrete structure in the large-span open space such as the existing train station have poor durability, large steel consumption, weak wind uncovering (or internal pressure) resistance and poor longitudinal rigidity caused by the fact that the beam string system cannot bear reverse load.

The invention solves the technical problem by adopting a scheme that a butterfly-shaped beam string structure-stainless steel tube concrete roof truss structure system comprises a butterfly-shaped beam string and a stainless steel tube concrete column, wherein the butterfly-shaped beam string comprises an upper string CFRP inhaul cable, a multifunctional connecting piece, a lower string rod, a through hole connecting piece, web members and a groove-shaped purlin, and the multifunctional connecting piece is arranged in the middle of the butterfly-shaped beam string;

two upper chord CFRP inhaul cables are arranged in a crossed mode, a multifunctional connecting piece penetrates through the upper chord CFRP inhaul cables, the outer ends of the upper chord CFRP inhaul cables are anchored with inhaul cable anchorage devices pre-embedded in the stainless steel tube concrete column, the included angle range of the upper chord CFRP inhaul cables and the horizontal plane is between 5 degrees and 10 degrees, and the horizontal height of the middle parts of the two crossed upper chord CFRP inhaul cables is lower than that of the anchoring ends;

two lower chords are arranged below two ends of each upper chord CFRP inhaul cable, the lower chords are steel pipe concrete poles, the upper ends of the lower chords are connected with a multifunctional connecting piece through bolts, the lower ends of the lower chords are connected with support node plates welded on the stainless steel pipe concrete columns through bolts, and the included angle between each lower chord and the horizontal plane ranges from 20 degrees to 35 degrees;

two stay cable through holes for the upper chord CFRP stay cable to pass through are formed in the upper portion of the multifunctional connecting piece at intervals from top to bottom, mid-span gusset plates for connecting the chord members are mounted below two ends of the through holes in the lower portion of the multifunctional connecting piece, the two stay cable through holes and the four support gusset plates are arranged according to the cross angle of the butterfly-shaped string beam, and the cross angle ranges from 45 degrees to 60 degrees;

a plurality of through hole connecting pieces are arranged on the upper chord CFRP inhaul cable at intervals, a web member is arranged below each through connecting piece, the upper end of each web member is connected with the lower end of each through hole connecting piece, and the lower end of each web member is connected with the lower chord; and each through hole connecting piece is provided with a groove-shaped purline, and the groove-shaped purlines are connected with the upper ends of the through hole connecting pieces through bolts.

Furthermore, the steel pipe concrete pole includes the stainless steel body, and the inside light foam concrete that fills of stainless steel body.

Furthermore, nonrust steel core concrete column is compound nonrust steel core concrete column, including the outer steel pipe of stainless steel material, set up the interior steel pipe of the carbon steel material in outer steel pipe, pour self-compaction concrete in the outer steel pipe, seted up concrete flow hole on the interior steel pipe, all seted up cable ground tackle prefabricated hole on interior steel pipe, the outer steel pipe.

Furthermore, the height distance between the upper and lower adjacent concrete flow holes is 1.5 times of the diameter of the inner steel pipe, and the aperture is 1/4 of the diameter of the inner steel pipe.

Furthermore, the multifunctional connecting piece, the stay cable anchorage device, the support gusset plate, the web member, the groove-shaped purline and the bolt are all made of stainless steel materials, the upper chord CFRP stay cable is made of carbon fiber materials, and the through hole connecting piece is made of aluminum alloy.

A construction method of a butterfly beam string-stainless steel tube concrete roof truss structure system comprises the following steps:

step 1: the prefabricated part: prefabricating an upper chord CFRP stay cable, a lower chord member, a web member, a multifunctional connecting piece, inner and outer steel pipes of a stainless steel pipe concrete column, a stay cable anchorage, a support node plate, a through hole connecting piece and a groove-shaped purline in a factory according to a design drawing; welding the web members on the lower chord members; welding a support node plate on an outer steel tube of the stainless steel tube concrete column; transporting the prefabricated part to a construction site;

step 2: constructing the stainless steel tube concrete column: determining the installation position of each stainless steel tube concrete column on the site according to a construction drawing; firstly, installing an inner steel pipe, and then installing an outer steel pipe; penetrating the stay cable anchorage device to the outside of the pipe from the stay cable anchorage device preformed holes of the inner steel pipe and the outer steel pipe, so that the tail part of the big end of the stay cable anchorage device clamps the inner wall of the inner steel pipe; then pouring self-compacting concrete into the steel pipe; repeating the processes until all the steel pipe concrete columns are processed;

and step 3: install chord member, multi-functional connecting piece and through-hole connecting piece down: when the strength of concrete in the stainless steel tube concrete column reaches a design value, a butterfly-shaped beam string is installed, and four lower chord members are connected with the multifunctional connecting piece on the ground through high-strength bolts; mounting the through hole connecting piece on the top of the web member; then, hoisting the steel pipe concrete column to a specified height by using a hoisting crane, and connecting the lower end of the lower chord to a support node plate of the steel pipe concrete column by using a high-strength bolt; then, a temporary support is built below the multifunctional connecting piece, and then a lifting rope of the hoisting crane is loosened;

and 4, step 4: installing and tensioning an upper chord CFRP inhaul cable: at the temporary support position, an upper chord CFRP cable passes through a cable through hole at the upper part of the multifunctional connecting piece and a plurality of through hole connecting pieces at two sides; then, connecting the outer end of the upper chord CFRP stay cable with a stay cable anchorage pre-embedded on the top of the stainless steel tube concrete column, and then tensioning to 100% of the design value of the cable force; then, repeating the steps to install another CFRP inhaul cable and tensioning to 100% of the designed cable force value; repeating the steps until all the butterfly-shaped beam string opening beams are installed;

and 5: installation of groove-shaped purlines: the method comprises the following steps of (1) forming bolt threaded holes at positions corresponding to a groove-shaped purlin lower flange and a through hole connecting piece, hoisting the purlins to the corresponding through hole connecting pieces by using a hoisting crane, and fixing the purlins on the through hole connecting pieces by using bolts; then installing a glass roof or a stainless steel composite plate roof on the purline; and finally, removing the temporary support.

Compared with the prior art, the invention has the following beneficial effects: the product has higher wind uncovering resistance and strong durability, and can be used in a roof truss structure system of a train platform with higher wind load and air chloride ion content in coastal areas; the butterfly type beam string adopts a cross arrangement mode to improve the longitudinal rigidity of the structure; two cross beam string beams of butterfly shape are connected into butterfly shape in the middle part, not only can bear the vertical force transmitted from the upper part, but also can effectively resist the uplifting force and internal air pressure caused by wind load; the structure can resist the influence of wind load and can effectively resist the instantaneous high pressure of the motor train to the roof caused by the passing of the platform track; the product can increase the space at the upper part of the platform and improve the ornamental value of the platform; and the service life of the platform is prolonged, and the maintenance cost is reduced.

Drawings

The invention is further described with reference to the following figures.

Fig. 1 is a schematic diagram of a butterfly type beam string-stainless steel pipe concrete roof truss structure system unit.

Fig. 2 is a partial exploded view of the multi-function connector.

Fig. 3 is a local connection explosion diagram of the butterfly beam string and the stainless steel tube concrete column.

Fig. 4 is a detailed schematic diagram of a stainless steel tube concrete column.

Fig. 5 is an overall schematic view of a butterfly beam string-stainless steel pipe concrete roof truss structure system.

Fig. 6 is a partial schematic view of a butterfly beam string-stainless steel pipe concrete roof truss structure system.

Fig. 7 is a partial transverse schematic view of a butterfly beam string-stainless steel tube concrete roof truss structural system.

Fig. 8 is a partial longitudinal schematic view of a butterfly beam string-stainless steel tube concrete roof truss structural system.

FIG. 9 is a fragmentary schematic view of a channel-type purlin installation.

In the figure: 1-winding up CFRP inhaul cable; 2-lower chord; 3-a web member; 4-stainless steel tube concrete column; 41-outer steel pipe; 42-inner steel tube; 43-self-compacting concrete; 44-a cable anchor; 45-support gusset plate; 411-prefabricating holes of the stay cable anchorage on the outer steel pipe; 421-concrete flow hole; 422-prefabricating holes for stay cable anchors on the inner steel pipe; 5-multifunctional connecting piece; 51-an upper cable through hole; 52-down cable through hole; 53-mid-span gusset plate; 6-through hole connection; 61-a through hole; 62-web member support gusset plate; 63-bolt hole for connecting purline; 7-groove-type purlines; 8-bolt.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1-9, a butterfly-shaped beam string-stainless steel tube concrete roof truss structure system comprises a butterfly-shaped beam string and a stainless steel tube concrete column 4, wherein the butterfly-shaped beam string comprises an upper string CFRP guy cable 1, a multifunctional connecting piece 5, a lower string rod 2, a through hole connecting piece 6, web members 3 and groove-shaped purlins 7, and the multifunctional connecting piece is arranged in the middle of the butterfly-shaped beam string;

two upper chord CFRP inhaul cables are arranged in a crossed mode, a multifunctional connecting piece penetrates through the upper chord CFRP inhaul cables, the outer ends of the upper chord CFRP inhaul cables are anchored with inhaul cable anchorage devices 43 pre-embedded in the stainless steel pipe concrete column, the included angle range of the upper chord CFRP inhaul cables and the horizontal plane is between 5 degrees and 10 degrees, and the horizontal height of the middle parts of the two crossed upper chord CFRP inhaul cables is lower than that of the anchoring ends;

two lower chords are arranged below two ends of each upper chord CFRP inhaul cable, the lower chords are steel pipe concrete poles, the upper ends of the lower chords are connected with a multifunctional connecting piece through bolts, the lower ends of the lower chords are connected with a support node plate 45 welded on a stainless steel pipe concrete column through bolts, and the included angle between each lower chord and the horizontal plane ranges from 20 degrees to 35 degrees;

two stay cable through holes 51 and 52 for an upper chord CFRP stay cable to pass through are formed in the upper portion of the multifunctional connecting piece at intervals from top to bottom, mid-span gusset plates 53 for connecting chord members are mounted below two ends of the through holes in the lower portion of the multifunctional connecting piece, the lower chord members are connected with the mid-span gusset plates through bolts, the two stay cable through holes and the four support gusset plates are arranged according to the cross angle of the butterfly-shaped string beam, and the cross angle range is 45-60 degrees;

a plurality of through hole connecting pieces are installed on the upper chord CFRP inhaul cable at intervals, a web member 3 is arranged below each through connecting piece, the upper end of each web member is connected with the lower end of each through hole connecting piece through a bolt, the lower end of each web member is welded with the lower chord, a groove-shaped purline 7 is arranged at the upper end of each connecting piece, and a bolt grain hole is prefabricated in the upper end face of each through hole connecting piece and used for being connected with the lower flange of the groove-shaped purline through a bolt 8.

In the embodiment, four lower chords are connected with two crossed upper chord CFRP guys through a multifunctional connecting piece at a core part to form a butterfly type beam string with good integrity and large longitudinal and transverse rigidity, and the upper chord CFRP guys are slightly inclined downwards and mainly bear axial tension; the lower chord is inclined upwards and mainly bears the axial pressure.

In the embodiment, two ends of the system along the longitudinal direction are separately provided with a beam string beam; the roof truss is constructed by butterfly-shaped beam strings and is similar to a valley-shaped roof truss with a low middle part and two low sides in the transverse direction.

In this embodiment, the concrete filled steel tubular pole comprises a stainless steel tubular body, the interior of which is filled with lightweight foam concrete.

In this embodiment, stainless steel core concrete column is compound stainless steel core concrete column, including stainless steel's outer steel pipe 41, set up the interior steel pipe 42 of the carbon steel material in outer steel pipe, pour self-compaction concrete 43 in the outer steel pipe, seted up concrete flow hole 421 on the interior steel pipe, all seted up cable ground tackle prefabricated hole 411, 422 on interior steel pipe, the outer steel pipe, convenient pre-buried cable lock ground tackle.

In this example, the height interval between the vertically adjacent concrete flow holes was 1.5 times the diameter of the inner steel pipe, and the diameter of the hole was 1/4 times the diameter of the inner steel pipe.

In this embodiment, the multifunctional connecting member, the stay cable anchorage, the support gusset plate, the web member, the groove-shaped purlin and all the bolts are made of stainless steel, the upper chord CFRP stay is made of carbon fiber, and the through hole connecting member is made of aluminum alloy.

A construction method of a butterfly beam string-stainless steel tube concrete roof truss structure system comprises the following steps:

step 1: the prefabricated part: prefabricating an upper chord CFRP stay cable, a lower chord member, a web member, a multifunctional connecting piece, inner and outer steel pipes of a stainless steel pipe concrete column, a stay cable anchorage, a support node plate, a through hole connecting piece and a groove-shaped purline in a factory according to a design drawing; welding the web members on the lower chord members; welding a support node plate on an outer steel tube of the stainless steel tube concrete column; transporting the prefabricated part to a construction site;

step 2: constructing the stainless steel tube concrete column: determining the installation position of each stainless steel tube concrete column on the site according to a construction drawing; firstly, installing an inner steel pipe, and then installing an outer steel pipe; penetrating the stay cable anchorage device to the outside of the pipe from the stay cable anchorage device preformed holes of the inner steel pipe and the outer steel pipe, so that the tail part of the big end of the stay cable anchorage device clamps the inner wall of the inner steel pipe; then pouring self-compacting concrete into the steel pipe; repeating the processes until all the steel pipe concrete columns are processed;

and step 3: install chord member, multi-functional connecting piece and through-hole connecting piece down: when the strength of concrete in the stainless steel tube concrete column reaches a design value, a butterfly-shaped beam string is installed, and four lower chord members are connected with the multifunctional connecting piece on the ground through high-strength bolts; mounting the through hole connecting piece on the top of the web member; then, hoisting the steel pipe concrete column to a specified height by using a hoisting crane, and connecting the lower end of the lower chord to a support node plate of the steel pipe concrete column by using a high-strength bolt; then, a temporary support is built below the multifunctional connecting piece, and then a lifting rope of the hoisting crane is loosened;

and 4, step 4: installing and tensioning an upper chord CFRP inhaul cable: at the temporary support position, an upper chord CFRP cable passes through a cable through hole at the upper part of the multifunctional connecting piece and a plurality of through hole connecting pieces at two sides; then, connecting the outer end of the upper chord CFRP stay cable with a stay cable anchorage pre-embedded on the top of the stainless steel tube concrete column, and then tensioning to 100% of the design value of the cable force; then, repeating the steps to install another CFRP inhaul cable and tensioning to 100% of the designed cable force value; repeating the steps until all the butterfly-shaped beam string opening beams are installed;

and 5: installation of groove-shaped purlines: the method comprises the following steps of (1) forming bolt threaded holes at positions corresponding to a groove-shaped purlin lower flange and a through hole connecting piece, hoisting the purlins to the corresponding through hole connecting pieces by using a hoisting crane, and fixing the purlins on the through hole connecting pieces by using bolts; then installing a glass roof or a stainless steel composite plate roof on the purline; and finally, removing the temporary support.

The external materials of the butterfly beam string-stainless steel tube concrete roof truss structure system are stainless steel, aluminum alloy and carbon fiber with good durability, so that the structure has good durability; the inner pipe of the stainless steel pipe concrete column is a carbon steel pipe with holes, concrete of the stainless steel pipe concrete column is poured once, and other components are prefabricated in a factory except that the concrete of the stainless steel pipe concrete column is poured in situ, so that construction is convenient; the lower chord of the butterfly type beam string adopts a steel pipe concrete member filled with light concrete inside, and under the condition of not increasing the dead weight, the steel consumption is reduced, and the butterfly type beam string has higher bearing capacity; the upper chord stay cable is made of CFRP materials with higher strength and lighter weight, and the bearing capacity of the butterfly beam string can be improved; the beam string adopts a cross arrangement mode to make up the defect of weak longitudinal rigidity of the traditional beam string structure; the butterfly type beam string can effectively resist the pulling force on wind load and the larger air pressure caused by train entering.

The butterfly beam string-stainless steel tube concrete roof truss structure system mainly has the following purposes: 1) because the system has higher wind uncovering resistance and strong durability, the product can be used in a roof truss structure system of a train platform with higher wind load and air chloride ion content in coastal regions. 2) Because the force transmission is reasonable, the structure can not only effectively resist wind uncovering, but also effectively resist instantaneous high pressure of the motor train to the roof caused by the platform track. 3) Due to the adoption of the CFRP inhaul cable with higher bearing capacity and the steel pipe concrete lower chord, the butterfly type beam string has higher bearing capacity. 4) The space of the upper part of the platform can be increased by using the product, and the platform is made of more beautiful stainless steel and aluminum alloy materials, so that the ornamental value of the platform is improved. 5) This product adopts bolted connection mostly, is detachable construction, construction convenience.

If this patent discloses or refers to parts or structures that are fixedly connected to each other, the fixedly connected may be understood as: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).

In the description of this patent, it is to be understood that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the patent, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the patent.

The above-mentioned preferred embodiments, further illustrating the objects, technical solutions and advantages of the present invention, should be understood that the above-mentioned are only preferred embodiments of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.