CN117661463A - Assembled truss for large-span beam construction and installation method thereof - Google Patents

Abstract

The invention discloses an assembled truss for large-span beam construction and an installation method thereof, and relates to the technical field of bridge construction, wherein the truss comprises a truss group, the truss group comprises a plurality of trusses which are arranged in parallel, adjacent trusses are connected through a transverse connection system, each truss comprises a lower chord, an upper chord and a plurality of truss web members which are positioned between the lower chord and the upper chord, and each corner of the bottom of the truss group is provided with at least two supporting components; the truss web members comprise a plurality of vertical web members and a plurality of inclined web members, two inclined web members are arranged between two adjacent vertical web members to form an inverted M shape, and the top, the middle and the bottom of each vertical web member are provided with an operation platform. The rods of the fabricated truss are connected through bolts or pin shafts, and different trusses can be assembled according to different construction environments; meanwhile, the truss group has strong bearing capacity, and can meet the construction requirements in the high altitude and high wind environment.

Description

A prefabricated truss for long-span beam construction and its installation method

Technical field

The invention relates to the technical field of bridge construction, and in particular to a prefabricated truss for large-span beam construction and an installation method thereof.

Background technique

The main tower is one of the important stress-bearing components of the bridge. It is mainly used to withstand the pressure transmitted by the main cable. In order to increase the lateral stiffness of the main tower and ensure the rationality of the structural stress, upper and lower beams are generally set between the two columns of the main tower. For the beams on the main tower, existing construction methods usually use steel pipe scaffolding, steel pipe columns, etc. as floor supports for construction and installation, and Bailey beams as the main beams of the beam supports for construction.

The disadvantages of the existing construction methods are: 1. The construction method of using steel pipe scaffolding or steel pipe columns as floor-standing supports results in a large amount of support materials, high usage costs, high risks of high-altitude steel structure hoisting, low construction safety and long construction period. ; 2. The main tower beam construction uses common Bailey beams as the main beams of the beam supports. In the plateau wind environment with higher challenges, Bailey beams have insufficient load-bearing capacity and poor wind resistance stability.

Contents of the invention

In view of the shortcomings in the existing technology, this application provides a prefabricated truss for long-span beam construction and its installation method, which can solve the problems of high cost of existing construction methods, high risks of hoisting high-altitude steel structures, and low construction safety. And the problem of long construction period.

In a first aspect, embodiments of the present application provide a prefabricated truss for long-span beam construction, including: a truss group, the truss group includes a plurality of trusses arranged in parallel, and adjacent trusses are connected through transverse connections. , the truss includes a lower chord, an upper chord and a plurality of truss web rods located between the lower chord and the upper chord, and at least two support assemblies are provided at each corner of the bottom of the truss group; Wherein, the truss web members include a plurality of vertical web members and a plurality of oblique web members, and two oblique web members are provided between two adjacent vertical web members to form an inverted M shape, and the vertical web members There are operating platforms at the top, middle and bottom of the pole.

In conjunction with the first aspect, in one embodiment, the transverse connection system includes an upper chord bar of the connection system, a web bar of the connection system and a lower chord bar of the connection system, the upper chord bar of the connection system and the lower chord bar of the connection system are parallel to each other, and the One end of the connecting system web bar is connected to the upper chord bar of the connecting system, and the other end is connected to the lower chord bar of the connecting system, and the transverse connecting system is in a Z-shape.

In conjunction with the first aspect, in one embodiment, the support assembly includes a distribution beam and a corbel, the corbel is connected to the tower column, the distribution beam is erected on the corbel, and the distribution beam and the corbel are There are steel plate pads and wedges between the corbels.

In conjunction with the first aspect, in one embodiment, the lower chord bar includes three lower chord short bars, the lower chord short bars are connected end to end, and the connection between the two adjacent lower chord short bars is provided with a first connection The upper chord bar includes five upper chord short bars, the upper chord short bars are connected end to end, and the connection between the two adjacent upper chord short bars is provided with a first connection system, wherein the first connection system Includes four steel plates and multiple long bolts.

Combined with the first aspect, in one embodiment, the connection between the truss web and the lower chord is provided with a second connection system, and the connection between the truss web and the upper chord is provided with a second connection system. A second connection system; wherein the second connection system includes lifting lugs and a plurality of pins.

In connection with the first aspect, in one embodiment, limiting devices 8 are provided at both ends of the upper chord rod for limiting the distance between the upper chord rod and the tower column.

In the second aspect, embodiments of the present application provide an installation method of prefabricated trusses for long-span beam construction. The installation is based on any of the above prefabricated trusses, which specifically includes the following steps:

S1: Splice the lower chord, upper chord and truss web rod to form a truss, and weld the operating platform on the truss;

S2: Weld the support components on the embedded parts of the tower columns, and mark the installation position of each truss on the top of the support components according to the construction plan;

S3: Install multiple trusses in batches in parallel to the marked positions of the support components, and weld the transverse connections between the trusses.

Combined with the second aspect, in one embodiment, the lower chord, the upper chord and the truss web are spliced to form a truss, and an operating platform is welded on the truss, which specifically includes the following steps:

S101: Splice the lower chord and the upper chord, and weld the second connection system on the lower chord and the upper chord;

S102: Splice the lower chord, upper chord and truss web to form a truss, install the bolts on the side and top of the truss, then lift the truss, install the bolts at the bottom of the truss, and mark each bolt to prevent loosening;

S103: Weld operating platforms at the top, middle and bottom of each truss web member.

Combined with the second aspect, in one embodiment, welding the support components on the embedded parts of the tower columns, and marking the installation position of each truss on the top of the support components according to the construction plan, specifically includes the following steps:

S201: Weld the corbels on the embedded parts in the tower columns on both sides, and lay wedges on the top of the corbels;

S202: Install a steel plate pad on the top of the wedge block, and then install a distribution beam on the top of the steel plate pad;

S203: According to the pre-designed engineering plan, determine the installation position of the trusses on the top of the distribution beam, mark each determined position, and weld the bottom limiter on one side of each marked position, and each truss Corresponds to a marked position.

In conjunction with the second aspect, in one embodiment, the multiple trusses are installed in batches in parallel at marked positions of the support assembly, and transverse connections are welded between the trusses, which specifically includes the following steps:

S301: Install the first group of trusses based on the set installation logic, and install the transverse connection system between two adjacent trusses. Then, install the second group of trusses based on the set installation logic, and perform the transverse connection system between two adjacent trusses. installation, and then remove the temporary struts;

Among them, each set of trusses that has been installed includes four trusses, which are the first truss, the second truss, the third truss and the fourth truss arranged in parallel in sequence. The fourth truss of the first set of trusses is connected to the second truss. The fourth truss of the group of trusses is adjacent. The installation logic is as follows:

S311: Weld the temporary struts on the top of the first truss, and the top of the temporary struts is adjacent to the top of the first truss. Select the second connection of the upper chord of the first truss as the lifting point, and use steel wire ropes to connect it. The first truss and lifting device are used to lift the first truss;

S312: Lift the first truss to the corresponding marked position of the first truss, and install the bottom limiter at the other end of the first truss corresponding to the marked position;

S313: Weld the lower end of the temporary brace on the first truss to the end point of the distribution beam close to the first truss;

S314: Install the bottom limiter at one end of the fourth truss corresponding to the marked position, select the second connection system of the upper chord of the fourth truss as the lifting point, use a wire rope to connect the fourth truss and the lifting device, and lift the fourth truss truss;

S315: Lift the fourth truss to the corresponding marked position of the fourth truss, and install the bottom limiter at the other end of the fourth truss corresponding to the marked position;

S316: Install the bottom limiter at one end of the third truss corresponding to the marked position, select the second connection of the upper chord of the third truss as the lifting point, use a wire rope to connect the third truss and the lifting device, and lift the third truss truss;

S317: Lift the third truss to the corresponding marked position of the third truss, and install the bottom limiter at the other end of the third truss corresponding to the marked position;

S318: Install the bottom limiter on one end of the second truss corresponding to the marked position, select the second connection of the upper chord of the second truss as the lifting point, use a wire rope to connect the second truss and the lifting device, and lift the second truss truss;

S319: Lift the second truss to the corresponding marked position of the second truss, and install the bottom limiter at the other end of the second truss corresponding to the marked position.

The beneficial effects brought by the technical solutions provided by the embodiments of this application at least include:

1. The members of the assembled truss provided by this application are all connected by bolts or pins, and different trusses can be assembled according to different construction environments;

2. The truss group in the prefabricated truss provided by this application has a strong load-bearing capacity, several times that of Bailey beams, and can meet the construction requirements in plateau windy environments;

3. The assembled truss provided by this application is equipped with a three-layer operating platform to facilitate the assembly and inspection of the truss.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without exerting creative efforts.

Figure 1 is a schematic structural diagram of a prefabricated truss for long-span beam construction provided by an embodiment of the present invention;

Figure 2 is a structural top view of a prefabricated truss for long-span beam construction provided by an embodiment of the present invention;

Figure 3 is a side view of the truss group structure of a prefabricated truss for long-span beam construction provided by an embodiment of the present invention;

Figure 4 is a front view of the layout of the operating platform of a prefabricated truss for long-span beam construction provided by an embodiment of the present invention;

Figure 5 is a side view of the layout of the operating platform of a prefabricated truss for long-span beam construction provided by an embodiment of the present invention;

Figure 6 is a schematic diagram of the suspension point arrangement of a prefabricated truss for long-span beam construction provided by an embodiment of the present invention;

Figure 7 is a schematic diagram of the installation of the first truss on the small mileage side;

Figure 8 is a schematic diagram of the installation of the second truss on the small mileage side;

Figure 9 is a schematic diagram of the installation of the four-piece truss on the small-mileage side;

Figure 10 is a schematic diagram of the installation of the truss group;

In the picture: 1. Lower chord; 2. Truss web; 21. Oblique web; 22. Vertical web; 3. Upper chord; 4. First connection; 5. Second connection; 6. Operation platform ; 7. Lifting lugs; 8. Limiting device; 9. Transverse connection system; 91. Connection system upper chord; 92. Connection system web rod; 93. Connection system lower chord; 10. Distribution beam; 11. Corbel; 12 , steel plate copy pad; 13. wedge.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments These are part of the embodiments of this application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of this application.

The embodiment of the present application provides a prefabricated truss for long-span beam construction and an installation method thereof, which can solve the problems of high cost of existing construction methods, high risks of hoisting high-altitude steel structures, low construction safety, and long construction period. .

Referring to Figures 1, 3 and 5, embodiments of the present application provide an assembled truss for long-span beam construction, including a truss group. The truss group includes a plurality of trusses arranged in parallel, and between adjacent trusses Connected by a transverse connection 9, the truss includes a lower chord 1, an upper chord 3 and a plurality of truss webs 2 located between the lower chord 1 and the upper chord 3. Each corner of the bottom of the truss group is provided with at least two Support assembly; wherein, the truss web rod 2 includes a plurality of vertical web rods 21 and a plurality of oblique web rods 22, and two oblique web rods 22 are provided between two adjacent vertical web rods 21 to form an inverted M shape. , and the top, middle and bottom of the vertical web rod 21 are provided with operating platforms 6.

The embodiment of the present application provides a prefabricated truss for long-span beam construction with a span of 31.6m and a height of 6m. Among them, the lower chord 1, the upper chord 3 and the truss web 2 all adopt new box structures. The cross section of the lower chord 1 is 380mm×300mm, and the cross section of the upper chord 3 is 388mm×560mm. They are located on a vertical web in the middle. The rod 21 and the oblique web rods 22 on both sides of the vertical web rod 21 and the vertical web rods at both ends of the truss are web rods with smaller stresses and are made of 2[20b steel. The remaining web rods are with larger stresses. As for the web bars, among the web bars that bear greater stress, the vertical web bar 21 adopts a new box-shaped structure with a cross-section of 284mm×260mm, and the oblique web bar 22 adopts a new box-shaped structure with a cross-section of 288mm×300mm. All truss rods are processed by CNC, and rods of equal size can be completely replaced, so that the assembled truss provided by this application can assemble different trusses according to different construction environments. At the same time, the assembled truss provided by this application is also equipped with multiple operating platforms 6. The platform located at the bottom is used for inspection and acceptance after the truss is installed, and the platform located in the middle is used for the construction of the connection system 9 between the trusses. , the platform located at the top is used for unhooking and dismantling the bottom formwork in the later stages of construction.

As an optional embodiment, as shown in Figures 2 and 3, the transverse connecting system 9 includes an upper connecting chord 91, a connecting web 92 and a lower connecting chord 93. The upper connecting chord 91 and the lower connecting chord 93 Parallel to each other, one end of the connecting system web rod 92 is connected to the connecting system upper chord 91 and the other end is connected to the connecting system lower chord 93, and the transverse connecting system 9 is Z-shaped. The transverse connection system 9 between every two adjacent trusses is connected to the vertical web rod 21 in a one-to-one correspondence. A steel plate with holes is welded in the middle of the vertical web rod 21. The upper chord bar 91 and the lower chord bar 93 are connected to each other. The end is connected to the perforated steel plate on the vertical web rod 21 of the adjacent truss through a long bolt. The upper chord bar 91 of the knot system, the web bar 92 of the connecting system and the lower chord bar 93 of the connecting system are all made of HW200×200/2[20b steel to enhance the out-of-plane stability.

As an optional embodiment, as shown in Figures 1 and 7, the support assembly includes a distribution beam 10 and a corbel 11. The corbel 11 is connected to the tower column. The distribution beam 10 is erected on the corbel 11, and the distribution beam 10 and the corbel are Steel plate pads 12 and wedges 13 are provided between the legs 11 . The distribution beam 10 is made of 2HN800×300 steel, and the corbels 11 are welded by steel plates with a thickness of 30mm and a thickness of 20mm.

As an optional embodiment, as shown in Figure 1, Figure 2 and Figure 4, the lower chord bar 1 includes three lower chord short bars, the lower chord short bars are connected end to end, and the connections between the two adjacent lower chord short bars are evenly spaced. A first connecting system 4 is provided; the upper chord rod 3 includes five upper chord short rods, the upper chord short rods are connected end to end, and the connection between two adjacent upper chord short rods is provided with a first connecting system 4; wherein, the first connecting system 4 is provided. A connecting system 4 includes four steel plates and a plurality of long bolts. When connecting two adjacent rods, first weld steel plates on the top, side and bottom surfaces between the two adjacent rods, then pass long bolts through the steel plates and rods, and further connect the rods and The steel plates are fixed together to ensure that there will be no relative movement between the rods and the steel plates, ensuring the stability of the connection between two adjacent rods.

As an optional embodiment, as shown in Figures 1 and 6, the connections between the truss web 22 and the lower chord 1 are provided with second connecting systems 5, and the connections between the truss web 22 and the upper chord 3 are A second connection system 5 is provided; wherein the second connection system 5 includes lifting lugs and a plurality of pins. The truss web rod 22 is connected to the lifting lugs and indirectly connected to the upper chord 3 and the lower chord 1. Both the upper chord 3 and the lower chord 1 are provided with five lifting lugs for connecting the vertical web rods 21 and 4 lifting lugs for connecting the vertical web rods 21. Lifting lugs connected to the oblique web rods 22.

As an optional embodiment, as shown in FIG. 1 , limiting devices 8 are provided at both ends of the upper chord 3 for limiting the distance between the upper chord 3 and the tower column. The limiting device 8 is used to ensure the distance between the upper chord 3 and the tower column. The two ends of the upper chord 3 are connected to the tower column through the limiting device 8, ensuring that the upper chord 3 will not shake in the horizontal direction, ensuring that This application provides the structural stability of an assembled truss.

Referring to Figures 6, 7, 8, 9 and 10, this application also provides an installation method of a prefabricated truss for large-span beam construction, which is based on any of the above prefabricated trusses. Specifically, Includes the following steps:

S1: Splice the lower chord 1, the upper chord 3 and the truss web 2 to form a truss, and weld the operating platform 6 on the truss;

S2: Weld the support components on the embedded parts of the tower columns, and mark the installation position of each truss on the top of the support components according to the construction plan;

S3: Install multiple trusses in batches in parallel to the marked positions of the support components, and weld the transverse connections 9 between the trusses.

In step S1, the truss is first assembled according to the truss structure, and at the same time, the operating platform 6 is welded on the truss to facilitate the staff to perform construction operations on the truss in subsequent steps.

In step S2, the embedded parts are placed when building the tower columns. The embedded parts are in the form of embedded perforated plate connectors. The perforated plate parts are 30mm thick and φ20HRB400E steel bars are inserted. The length of the inserted steel bars is 1050mm. , the anchor plate is supplemented by welding φ22mm ML15 shear nails, and the embedded steel plates are all made of galvanized or stainless steel plates. According to the construction plan pre-designed by the staff, mark the installation position of each truss on the top of the support assembly. When lowering the trusses later, you only need to lower them according to the marked position, which improves construction efficiency and ensures the safety of truss installation. accuracy.

In step S3, the trusses are hoisted and assembled to complete the construction of an assembled truss provided by this application.

As an optional embodiment, as shown in Figures 4, 5 and 6, the lower chord 1, the upper chord 3 and the truss web 2 are spliced to form a truss, and the operating platform 6 is welded on the truss, which specifically includes the following steps:

S101: Splice the lower chord 1 and the upper chord 3, and weld the second connection 5 on the lower chord 1 and the upper chord 3;

S102: Splice the lower chord 1, the upper chord 3 and the truss web 2 to form a truss, install the bolts on the side and top of the truss, then lift the truss, install the bolts at the bottom of the truss, and mark each bolt to prevent loosening;

S103: Weld the operating platform 6 at the top, middle and bottom of each truss web rod 2.

In step S101, three lower chord short poles are first spliced into lower chord poles 1, and five upper chord short poles are spliced into upper chord poles 3, and the first connection system 4 is provided at the splicing joints, and then the lower chord poles 1 and the upper chord poles are spliced together. Weld the second connection system 5 at the corresponding position on 3 and wait for subsequent assembly;

In step S102, multiple truss web rods 2 are connected to the lower chord 1 and the upper chord 3 through the second connection system 5, and are combined to form a truss. During assembly, the assembly work can be assisted by two 25t truck cranes and upstream and downstream tower cranes. conduct. After assembling the truss, first install the bolts on the sides and top of the truss, then lift the truss using two 25t trucks, partially pad the truss, and then install the bolts at the bottom of the truss. The bolts are M24 type with a tightening torque of 630-860N·m. After the bolts are tightened in place, use a marker to mark the nut and the connecting plate to prevent loosening to record the current position of the nut.

In step S103, the truss is erected by a 25t truck crane, temporary supports are first set up on both sides of the truss, and the welding operation platform 6 is constructed on the truss. A total of 3 layers of operation platforms 6 are set up, and the bottom platform is set on the vertical web rod. On the lower chord 1 just below 21, the middle platform is set at the middle position of the vertical web 21, and the top platform is set on the upper chord 3 just above the vertical web 21. The bottom platform is used for inspection and acceptance after installation is completed, the middle platform is used for the construction of the transverse connection system 9 between the trusses, and the top platform is used for unhooking and later dismantling the bottom formwork.

As an optional embodiment, see Figure 7, weld the support components on the embedded parts of the tower columns, and mark the installation position of each truss on the top of the support components according to the construction plan, which specifically includes the following steps:

S201: Weld the corbels 11 on the embedded parts in the tower columns on both sides, and lay wedges 13 on the top of the corbels 11;

S202: Install the steel plate pad 12 on the top of the wedge 13, and then install the distribution beam 10 on the top of the steel plate pad 12;

S203: According to the pre-designed engineering plan, determine the installation position of the truss on the top of the distribution beam 10, mark each determined position, and weld the bottom limiter on one side of each marked position, and each piece The truss corresponds to a marked position.

In step S201, the corbels 11 are now welded to the embedded parts in the tower columns on both sides. Each corbel 11 needs to be connected to the embedded parts through 6 JL1080-φ40 precision-rolled threaded steel bars. Each corbel 11 Rebar pre-tensioned 60t.

In step S202, the distribution beam 10 is longitudinally fixed on the wedge block 13. The staff needs to ensure that the connection between the distribution beam 10 and the wedge block 13 is stable to ensure that the distribution beam 10 will not move when the truss is hoisted.

In step S203, the placement position of each truss is determined, and the bottom limiter on one side is installed to provide a preliminary limit to the truss when the truss is hoisted. After the truss is hoisted in place, the other side is installed. The bottom limiters on the side are welded on, and the limits on the trusses are completed.

As an optional embodiment, as shown in Figures 7, 8, 9 and 10, multiple trusses are installed in batches in parallel to the marked positions of the support assembly, and transverse connections 9 are welded between the trusses. , specifically including the following steps:

S301: Install the first group of trusses based on the set installation logic, and install the lateral connection system 9 between two adjacent trusses, and then install the second group of trusses based on the set installation logic, and perform the lateral connection between the two adjacent trusses. Installation of tie 9, and then removal of temporary braces;

In step S301, first divide the multiple trusses into two groups for installation, and then remove the fixing devices welded during the installation process to complete the installation of the prefabricated truss provided by this application.

Among them, each set of trusses that has been installed includes four trusses, which are the first truss, the second truss, the third truss and the fourth truss arranged in parallel in sequence. The fourth truss of the first set of trusses is connected to the second truss. The fourth truss of the group truss is adjacent, and the installation logic is set as:

S311: Weld the temporary struts on the top of the first truss, and the top of the temporary struts is adjacent to the top of the first truss. Select the second connection 5 of the upper chord 3 of the first truss as the lifting point. Use The steel wire rope connects the first truss and the lifting device to lift the first truss;

S312: Lift the first truss to the corresponding marked position of the first truss, and install the bottom limiter at the other end of the first truss corresponding to the marked position;

S313: Weld the lower end of the temporary brace on the first truss to the end point of the distribution beam 10 close to the first truss;

S314: Install the bottom limiter at one end of the fourth truss corresponding to the marked position, select the second connection 5 of the upper chord 3 of the fourth truss as the lifting point, use a wire rope to connect the fourth truss and the lifting device, and lift the fourth truss. four-piece trusses;

S315: Lift the fourth truss to the corresponding marked position of the fourth truss, and install the bottom limiter at the other end of the fourth truss corresponding to the marked position;

S316: Install the bottom limiter on one end of the third truss corresponding to the marked position, select the second connection 5 of the upper chord 3 of the third truss as the lifting point, use a wire rope to connect the third truss and the lifting device, and lift the third truss. three-piece truss;

S317: Lift the third truss to the corresponding marked position of the third truss, and install the bottom limiter at the other end of the third truss corresponding to the marked position;

S318: Install the bottom limiter at one end of the second truss corresponding to the marked position, select the second connection 5 of the upper chord 3 of the second truss as the lifting point, use a wire rope to connect the second truss and the lifting device, and lift the second truss. two-piece truss;

S319: Lift the second truss to the corresponding marked position of the second truss, and install the bottom limiter at the other end of the second truss corresponding to the marked position.

In step S311, temporary struts are first welded on the top of the first truss. When the first truss is welded to the distribution beam 10, the temporary struts can be welded to the distribution beam 10 to achieve fixation and limitation. For the purpose of the first truss, the temporary support rods are made of I-25 steel. At the same time, two tower cranes are used for lifting. In order to avoid side bending of the truss during lifting, four φ32mm steel wire ropes are used. Each steel wire rope is 10m long and four 17t shackles are used for lifting. The lifting point is arranged at the lifting eye of the upper chord 3, and the steel wire rope is used to wrap around the upper chord 3 for bundling and lifting.

In step S312, after the first truss is hoisted to the corresponding marked position of the first truss, the bottom limiter on the other side of the first truss is welded to preliminarily fix the first truss.

In step S313, the temporary support rod and the distribution beam 10 are welded together, the first truss is further fixed, and the first truss is limited.

In steps S314 to S319, the fourth, third and second trusses in the group are hoisted and limited fixed in sequence. After completing the hoisting operation of all trusses in the group, two adjacent trusses are welded. The lateral connection system 9 between them is then carried out to hoist the next set of trusses, and the lateral connection system 9 between the two adjacent trusses in the next set of trusses is welded. After all the trusses are hoisted, the transverse connection system 9 between the two sets of trusses is welded to complete the installation of the prefabricated truss provided by this application, and then the temporary braces on both sides of the prefabricated truss provided by this application are removed.

In the description of this application, it should be noted that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this application and simplifying the description. It is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as a limitation on the present application. Unless otherwise clearly stated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, It can also be an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be an internal connection between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

It should be noted that in this application, relational terms such as “first” and “second” are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply There is no such actual relationship or sequence between these entities or operations. Furthermore, the terms "comprises," "comprises," or any other variations thereof are intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus that includes a list of elements includes not only those elements, but also those not expressly listed other elements, or elements inherent to the process, method, article or equipment. Without further limitation, an element defined by the statement "comprises a..." does not exclude the presence of additional identical elements in a process, method, article, or apparatus that includes the stated element.

The above descriptions are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be practiced in other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims (10)

1. The utility model provides an assembled truss that large-span crossbeam construction was used which characterized in that includes:

the truss group comprises a plurality of trusses which are arranged in parallel, and adjacent trusses are connected through a transverse connection system (9), wherein each truss comprises a lower chord member (1), an upper chord member (3) and a plurality of truss web members (2) which are positioned between the lower chord member (1) and the upper chord member (3), and each corner of the bottom of the truss group is provided with at least two supporting components;

the truss web members (2) comprise a plurality of vertical web members (21) and a plurality of inclined web members (22), two inclined web members (22) are arranged between two adjacent vertical web members (21) to form an inverted M shape, and the top, the middle and the bottom of each vertical web member (21) are provided with an operation platform (6).

2. The fabricated truss for construction of a large span beam according to claim 1, wherein: the transverse connection system (9) comprises a connection system upper chord member (91), a connection system web member (92) and a connection system lower chord member (93), wherein the connection system upper chord member (91) and the connection system lower chord member (93) are mutually parallel, one end of the connection system web member (92) is connected with the connection system upper chord member (91), the other end of the connection system web member is connected with the connection system lower chord member (93), and the transverse connection system (9) is Z-shaped.

3. The fabricated truss for construction of a large span beam according to claim 1, wherein: the supporting assembly comprises a distribution beam (10) and brackets (11), the brackets (11) are connected with the tower column, the distribution beam (10) is erected on the brackets (11), and a steel plate shoveling pad (12) and a wedge block (13) are arranged between the distribution beam (10) and the brackets (11).

4. A fabricated truss for use in construction of a large span beam as defined in claim 3, wherein:

the lower chord member (1) comprises three lower chord short rods which are connected end to end, and a first connecting system (4) is arranged at the connecting position between two adjacent lower chord short rods; the upper chord member (3) comprises five upper chord short rods, the upper chord short rods are connected end to end, and a first connecting system (4) is arranged at the connecting position between two adjacent upper chord short rods;

wherein the first coupling system (4) comprises four steel plates and a plurality of strip bolts.

5. The fabricated truss for construction of a large span beam according to claim 4, wherein:

the connection parts of the truss web members (22) and the lower chords (1) are respectively provided with a second connection system (5), and the connection parts of the truss web members (22) and the upper chords (3) are respectively provided with a second connection system (5);

wherein the second coupling system (5) comprises a lifting lug and a plurality of pins.

6. The fabricated truss for construction of a large span beam according to claim 5, wherein: limiting devices 8 are arranged at two ends of the upper chord member (3) and used for limiting the distance between the upper chord member (3) and the tower column.

7. A method for installing a fabricated truss for construction of a large-span beam, which is used for installing the fabricated truss according to any one of claims 1 to 6, and is characterized by comprising the following steps:

splicing the lower chord member (1), the upper chord member (3) and the truss web member (2) to form a truss, and welding an operation platform (6) on the truss;

welding a support assembly on an embedded part of the tower column, and marking the mounting position of each truss at the top of the support assembly according to a construction plan;

a plurality of trusses are mounted in parallel in batches to the support assembly at marked locations and transverse ties (9) are welded between the trusses.

8. The method for installing the fabricated truss for the construction of the large-span cross beam according to claim 7, wherein the spliced lower chord member (1), the upper chord member (3) and the truss web member (2) form the truss, and the operation platform (6) is welded on the truss, specifically comprising the following steps:

splicing the lower chord member (1) and the upper chord member (3), and welding a second connecting system (5) on the lower chord member (1) and the upper chord member (3);

splicing the lower chord member (1), the upper chord member (3) and the truss web member (2) to form a truss, installing bolts on the side surface and the top surface of the truss, hoisting the truss, installing bolts on the bottom of the truss, and carrying out anti-loosening marks on each bolt;

an operating platform (6) is welded at the top, middle and bottom of each truss web member (2).

9. The method for installing the fabricated truss for the construction of the large-span beam according to claim 7, wherein the support assembly is welded on the embedded part of the tower column, and the installation position of each truss is marked on the top of the support assembly according to the construction plan, and the method specifically comprises the following steps:

welding brackets (11) on embedded parts in tower columns at two sides, and paving wedges (13) at the tops of the brackets (11);

a steel plate shoveling pad (12) is arranged at the top of the wedge block (13), and then a distribution beam (10) is arranged at the top of the steel plate shoveling pad (12);

according to a pre-designed engineering plan, the mounting positions of the trusses are determined at the top of the distribution beam (10), marking is carried out at each determined position, a bottom limiting piece is welded at one side of each marked position, and each truss corresponds to one marked position.

10. Method for installing a fabricated truss for construction of a large span beam according to claim 9, characterized in that the steps of installing a plurality of trusses in parallel in batches to the marking location of the supporting assembly and welding a transverse coupling system (9) between the trusses, in particular comprising the steps of:

installing a first group of trusses based on set installation logic, installing a transverse connection system (9) between two adjacent trusses, installing a second group of trusses based on set installation logic, installing the transverse connection system (9) between two adjacent trusses, and removing the temporary stay bars;

each group of trusses which are installed comprises 4 trusses, wherein the first trusses, the second trusses, the third trusses and the fourth trusses are sequentially arranged in parallel, the fourth trusses of the first group of trusses are adjacent to the fourth trusses of the second group of trusses, and the set installation logic is as follows:

a temporary brace rod is welded at the top of the first truss, the top end of the temporary brace rod is adjacent to the top end of the first truss, a second connecting system (5) of an upper chord (3) of the first truss is selected as a lifting point, and a steel wire rope is used for connecting the first truss with a lifting device to lift the first truss;

hoisting the first truss to the mark position corresponding to the first truss, and installing a bottom limiting piece at the other end of the mark position corresponding to the first truss;

welding the lower end of the temporary stay bar on the first truss and the end point of the distribution beam (10) close to the first truss;

a bottom limiting piece is arranged at one end of the fourth truss corresponding to the marked position, a second connecting system (5) of an upper chord member (3) of the fourth truss is selected as a lifting point, and a steel wire rope is used for connecting the fourth truss with a lifting device to lift the fourth truss;

hoisting the fourth truss to a marking position corresponding to the fourth truss, and installing a bottom limiting piece at the other end of the fourth truss corresponding to the marking position;

a bottom limiting piece is arranged at one end of the third truss corresponding to the marked position, a second connecting system (5) of an upper chord member (3) of the third truss is selected as a lifting point, and a steel wire rope is used for connecting the third truss with a lifting device to lift the third truss;

hoisting the third truss to the mark position corresponding to the third truss, and installing a bottom limiting piece at the other end of the third truss corresponding to the mark position;

a bottom limiting piece is arranged at one end of the second truss corresponding to the marking position, a second connecting system (5) of an upper chord member (3) of the second truss is selected as a lifting point, and a steel wire rope is used for connecting the second truss with a lifting device to lift the second truss;

and hoisting the second sheet truss to the position of the mark corresponding to the second sheet truss, and installing a bottom limiting piece at the other end of the second sheet truss corresponding to the position of the mark.