Construction method and structure of large-span rigid concrete beam

Abstract

The present application relates to a kind of large-span rigid concrete beam construction method and its structure, profile steel column both sides are provided with upper positioning plate according to profile steel beam size, lower positioning corbel, when first section profile steel beam is hoisted, it can be directly hoisted and placed on lower positioning corbel, not only reduce hoisting difficulty, but also provide support for first section profile steel beam, improve structural strength;When middle section steel beam is hoisted, it is hoisted and is quickly positioned and connected device of profile steel beam, hoisting positioning sub-mother device fixed on the upper flange plate of first section and middle section steel beam respectively is used to assist hoisting positioning, and profile steel beam can be fixed by positioning bolt after positioning accurately, facilitate subsequent welding construction, greatly improve the construction efficiency and quality of profile steel beam hoisting splicing;Tensioning template is fastened using freely adjustable tensioning bolt, and annular anchoring member is welded on profile steel beam bottom, avoid the structure weakness caused by profile steel beam opening.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, specifically to a construction method and structure for large-span stiffened concrete beams. Background Technology

[0002] Reinforced concrete structures are a major form of steel-concrete composite structures. By adding a steel frame to the concrete, a steel-reinforced concrete structure is formed, which effectively increases the ductility and shear strength of the concrete beams. It fully utilizes the characteristics of both steel and concrete. Compared with reinforced concrete structures, it has the advantages of high stiffness, good ductility, and steel saving. This greatly reduces the height and cross-section of large-span concrete beams, thereby increasing the effective story height.

[0003] However, when steel beams, steel columns, prestressing, or even multiple beams intersecting simultaneously are involved, the construction process becomes complex and the construction is difficult. In particular, there are problems such as difficulty in hoisting stiffened steel beams, excessive openings in steel components which can lead to reduced structural strength, and difficulty in erecting formwork. Summary of the Invention

[0004] The purpose of this invention is to provide a construction method and structure for large-span stiffened concrete beams that is convenient, fast, safe, and reliable in terms of construction quality. This method enables rapid hoisting, positioning, and connection of stiffened steel beams, reduces the number of openings in the stiffened steel beams, improves the construction efficiency of formwork erection, and enhances the construction quality of large-span stiffened concrete beams.

[0005] To achieve the above technical objectives, the present invention adopts the following technical solution: a construction method for large-span stiffened concrete beams, comprising the following specific steps:

[0006] Step 1) Construction preparation: Familiarize yourself with the drawings, cooperate with the steel structure production unit to complete the segmented design of the steel beams, re-inspect the quality of the steel materials, and participate in the processing, welding and installation of the steel structure;

[0007] Step 2) Construction of steel columns: After the positioning and measurement are completed, according to the dimensions of the first and last steel beams, weld the positioning plate and the lower positioning bracket on the side of the steel column, and then hoist the steel column and install it vertically on the reinforced concrete column.

[0008] Step 3) Hoisting of the first and last steel beams: The hoisting and positioning sub-device is fixed to the edge of the upper flange plate of the first and last steel beams by the sub-device fixing bolts; the hoisting and positioning sub-device is connected to the hoisting lifting equipment, and the first and last steel beams are hoisted and positioned on one side between the upper positioning plate and the lower positioning bracket. After the first and last steel beams are hoisted into place, the elevation and axis error are checked and corrected. Then the first and last steel beams are welded and fixed to the steel column and the lower positioning bracket.

[0009] Step 4) Lifting of the intermediate steel beam: The lifting and positioning main device is fixed to the edge of the upper flange plate of the intermediate steel beam using the main device fixing bolts. Then, the lifting and positioning main device is connected to the lifting and hoisting equipment. The lifting and hoisting equipment is used to lift the intermediate steel beam. When the intermediate steel beam approaches the first and last steel beams, the lifting and positioning main device is connected to the lifting and positioning sub-devices on the first and last steel beams using the lifting and positioning connecting bolts. The lifting and positioning sub-devices are equipped with a first connecting plate, and the lifting and positioning main device is equipped with a second connecting plate. Both the first and second connecting plates have... The hoisting and positioning connecting screw is provided with connecting holes. The hoisting and positioning connecting screw passes through the connecting holes on both the first and second connecting plates. A locking nut is connected to the hoisting and positioning connecting screw. The axial distance between the middle section steel beam and the first and last section steel beams is adjusted by the positioning connecting screw. The edge of the upper flange plate of the first and last section steel beams is inserted into the second slot on the hoisting and positioning mother device. After the middle section steel beam is accurately positioned, the mother device positioning bolts on the positioning mother device are tightened. The mother device positioning bolts tighten the first and last section steel beams, realizing the positioning connection between the middle section steel beam and the first and last section steel beams.

[0010] The intermediate steel beams were positioned and hoisted in the same manner, and the positioning connection between adjacent intermediate steel beams was achieved.

[0011] Step 5) Steel beam assembly: The edges of the upper and lower flanges of the first and last steel beams and the middle steel beams are connected by bevel welding. The edges of the upper and lower flanges of adjacent middle steel beams are connected by bevel welding. The webs of adjacent middle steel beams are connected by reinforcing ribs.

[0012] Step 6) Binding of reinforcing steel bars for the stiffening beam;

[0013] Step 7) Steel beam formwork erection: Weld the bottom of the annular anchor to the web, top plate, and bottom plate of the middle section steel beam and the first and last sections steel beam; Set up the formwork on the outside of the middle section steel beam and the first and last sections steel beam, then pass one end of the L-shaped tie bolt through the hole on the formwork and thread it to the formwork fixing nut, with the formwork fixing nut located on the outside of the formwork; Set up an L-shaped structure on the other end of the L-shaped tie bolt, insert the L-shaped structure into the annular anchor and connect it to the annular anchor; Tighten the formwork fixing nut to make the L-shaped tie bolt and the annular anchor overlap and twist together to form a tie system between the formwork and the steel beam;

[0014] Step 8) Concrete pouring: Pour stiffened concrete into the formwork. After the concrete is formed, a large-span stiffened concrete beam is formed.

[0015] Preferably, in step 2), a pre-embedded section of a steel column is pre-embedded in the reinforced concrete column, and the lower end of the steel column is welded to the pre-embedded section of the steel column during installation.

[0016] Preferably, the hoisting and positioning sub-device is provided with a first slot, and a sub-device fixing bolt is connected to one side of the first slot; the hoisting and positioning mother device is provided with a second slot, and a mother device fixing bolt and a mother device positioning bolt are connected to both sides of the second slot.

[0017] Preferably, in step 3), when the hoisting and positioning sub-device is fixed, the edge of the upper flange plate of the first and last steel beams is inserted into the first slot on the hoisting and positioning sub-device, and then the fixing bolts of the sub-device are tightened so that the fixing bolts of the sub-device are pressed against the upper flange plate of the first and last steel beams.

[0018] Preferably, in step 4), when the hoisting and positioning mother device is fixed, the edge of the upper flange plate of the middle section steel beam is inserted into the second slot on the hoisting and positioning mother device, and then the positioning bolts of the mother device are tightened, so that the positioning bolts of the mother device are pressed against the upper flange plates of the first and last sections of steel beam, and the hoisting and positioning mother device is partially suspended to the outer side of the end of the middle section steel beam.

[0019] Preferably, in step 5), the reinforcing rib is provided with several bolt connection holes, and the web of the intermediate steel beam is provided with bolt through holes corresponding to the bolt connection holes on the reinforcing rib. The high-strength bolt passes through both the bolt connection holes and the bolt through holes, thereby achieving the connection between the reinforcing rib and the web of the intermediate steel beam.

[0020] Preferably, in step 8), when pouring the stiffened concrete, the strength grade of the stiffened concrete is C40, and a small-diameter vibrator is used for concrete vibration.

[0021] A long-span stiffened concrete beam structure is constructed using a long-span stiffened concrete beam construction method.

[0022] This invention has the following characteristics and beneficial effects:

[0023] (1) The steel column of the present invention has an upper positioning plate and a lower positioning bracket on both sides according to the size of the steel beam. When the first section of the steel beam is hoisted, it can be directly hoisted and placed on the lower positioning bracket, which not only reduces the hoisting difficulty, but also provides support for the first section of the steel beam and improves the structural strength.

[0024] (2) When the middle section steel beam of the present invention is hoisted, a quick positioning connection device for hoisting steel beam is adopted. The hoisting positioning mother and son device is fixed on the upper flange plate of the first, last and middle sections of the steel beam respectively to assist in hoisting and positioning. After accurate positioning, the steel beam can be fixed by positioning bolts, which facilitates subsequent welding construction and greatly improves the construction efficiency and quality of steel beam hoisting and splicing.

[0025] (3) The present invention uses freely adjustable tie bolts to fasten the tie template. The bottom of the annular anchor is welded to the steel beam, which avoids the structural weakness caused by the opening of the steel beam. The L-shaped tie bolt and the annular anchor are overlapped and twisted, which greatly increases the horizontal and vertical adjustment range of the tie bolt and solves the problem of re-opening the template due to inaccurate position. Attached Figure Description

[0026] Figure 1 A simplified diagram of the large-span stiffened concrete beam structure of this invention;

[0027] Figure 2 A simplified diagram of the reinforced concrete steel column structure of this invention;

[0028] Figure 3 Connection diagram of the stiffening rib plate of the rigid steel beam of the present invention;

[0029] Figure 4 Diagram of the rapid positioning structure for hoisting rigid steel beams of this invention;

[0030] Figure 5 Figure of the quick positioning and connection device for hoisting stiff steel beams of the present invention;

[0031] Figure 6 This invention provides a freely adjustable anti-pull template system diagram;

[0032] Figure 7 This invention provides a structural diagram of the welding points for tie bolts.

[0033] Figure 8 This invention features a freely adjustable tie bolt structure diagram;

[0034] Figure 9 Flowchart of the construction method for large-span stiffened concrete beams of this invention;

[0035] Wherein: 1-Reinforced concrete column; 2-Steel column plate; 3-Upper positioning plate; 4-Lower positioning bracket; 5-First and last steel beams; 6-Middle steel beam; 7-Reinforcing rib; 8-Lifting and positioning sub-device; 9-Lifting and positioning main device; 10-Main device fixing bolt; 11-Main device positioning bolt; 12-Lifting and positioning connecting screw; 13-Sub-device fixing bolt; 14-Bolt connection hole; 15-Formwork; 16-Formwork fixing nut; 17-L-type tie bolt; 18-Ring anchor; 19-Steel beam. Detailed Implementation

[0036] The present invention will be further described below with reference to embodiments. These embodiments are only for the purpose of helping to understand the present invention. Those skilled in the art can make improvements to the present invention without departing from the principles thereof, and these improvements also fall within the protection scope of the claims of the present invention.

[0037] like Figure 1-9 As shown, the large-span stiffened concrete beam structure includes stiffened concrete columns 1, steel columns 2, upper positioning plates 3, lower positioning brackets 4, first and last steel beams 5, middle steel beams 6, reinforcing ribs 7, hoisting positioning sub-devices 8, hoisting positioning main devices 9, main device fixing bolts 10, main device positioning bolts 11, hoisting positioning connecting screws 12, sub-device fixing bolts 13, bolt connection holes 14, templates 15, template fixing nuts 16, L-shaped tie bolts 17, and ring anchors 18.

[0038] like Figure 1-3 As shown, reinforced concrete columns 1 are poured on both sides of the large-span reinforced concrete beam, and steel columns 2 are installed on the reinforced concrete columns 1. Embedded sections of steel columns are pre-embedded in the reinforced concrete columns 1, and the lower ends of the steel columns 2 are welded to these embedded sections. An upper positioning plate 3 and a lower positioning bracket 4 are welded to the inner side of the steel columns 2. The lower positioning bracket 4 is an I-beam. The first and last steel beams 5 are hoisted and positioned using the upper positioning plate 3 and the lower positioning bracket 4. The first and last steel beams 5 are steel beams 19, installed between the upper positioning plate 3 and the lower positioning bracket 4. One side of the first and last steel beams 5 is connected to the steel column 2, and the other side is connected to the middle steel beam 6. The intermediate steel beam 6 is a steel section beam 19, located between the first and last steel beams 5 on both sides. Multiple intermediate steel beams 6 are provided, connected end-to-end. Reinforcing ribs 7 are provided at the joints of the intermediate steel beams 6 to improve the strength of the large-span stiffened concrete beam. The reinforcing ribs 7 have a rectangular plate structure and several bolt holes 14. The web of the intermediate steel beam 6 has bolt through holes corresponding to the bolt holes 14 on the reinforcing ribs 7. The reinforcing ribs 7 are connected between adjacent intermediate steel beams 6 by bolts.

[0039] like Figure 4-5 As shown, the intermediate steel beam 6 is positioned and connected to the first and last steel beams 5, as well as to the intermediate steel beams 6 themselves, using a rapid positioning connection device for hoisting stiff steel beams. The rapid positioning connection device for hoisting stiff steel beams includes a hoisting positioning sub-device 8, a hoisting positioning main device 9, a main device fixing bolt 10, a main device positioning bolt 11, a hoisting positioning connecting screw 12, and a sub-device fixing bolt 13. The hoisting positioning sub-device 8 has a first slot, with the sub-device fixing bolt 13 connected to one side of the first slot. The hoisting positioning main device 9 has a second slot, with the main device fixing bolt 10 and the main device positioning bolt 11 connected to both sides of the second slot. The hoisting positioning sub-device 8 has a first connecting plate, and the hoisting positioning main device 9 has a second connecting plate. Both the first and second connecting plates have connecting holes.

[0040] When positioning and connecting the intermediate steel beam 6 with the first and last steel beams 5, the hoisting positioning sub-device 8 is fixed to the edge of the upper flange plate of the first and last steel beams 5 by sub-device fixing bolts 13, and the hoisting positioning main device 9 is fixed to the edge of the upper flange plate of the intermediate steel beam 6 by main device fixing bolts 10. The edge of the upper flange plate of the intermediate steel beam 6 is inserted into the second slot on the hoisting positioning main device 9; the hoisting positioning sub-device 8 is fixed to the edge of the upper flange plate of the first and last steel beams 5 by sub-device fixing bolts 13, and the upper flange plate of the first and last steel beams 5 is fixed to the edge of the upper flange plate of the first and last steel beams 5. The edge of the flange plate is engaged in the first slot on the hoisting positioning sub-device 8; during the hoisting and positioning process, the middle section steel beam 6 is connected to the hoisting positioning sub-device 8 and the hoisting positioning main device 9 via the hoisting positioning connecting screw 12, which passes through the connecting holes on the first and second connecting plates simultaneously; after the middle section steel beam 6 reaches the installation position, the edge of the upper flange plate of the first and last section steel beams 5 is engaged in the second slot on the hoisting positioning main device 9. After accurate positioning, the positioning bolts 11 of the main device are tightened to facilitate subsequent welding construction. The positioning connection between the middle section steel beams 6 is carried out in the same way.

[0041] like Figure 6-8 As shown, the freely adjustable tie rod formwork system consists of formwork 15, formwork fixing nuts 16, L-shaped tie rods 17, annular anchors 18, and steel beams 19. The annular anchors 18 are circular, and the steel beams 19 are I-shaped. The annular anchors 18 are welded to the web, top plate, and bottom plate of the middle section steel beam 6 and the first and last section steel beams 5 to avoid structural weakness caused by opening holes in the steel beams 19. The formwork 15 has a rectangular frame structure and is welded from four plates. The formwork 15 is fitted onto the outside of the steel beams 19. One end of the L-shaped tie rod has an L-shaped structure. The L-shaped structure at one end of the L-shaped tie bolt passes through and connects to the annular anchor 18. The other end of the L-shaped tie bolt passes through a hole in the template 15 and is threadedly connected to the template fixing nut 16, which is located on the outside of the template 15. The L-shaped structure can be adjusted horizontally and vertically over a wide range, solving the problem of re-drilling holes in the template due to inaccurate positioning. Tightening the template fixing nut 16 causes the L-shaped tie bolt 17 to overlap and tighten with the annular anchor 18, forming a tie system between the template 15 and the steel beam 19. The L-shaped tie bolt 17 ensures that the steel beam 19 is centrally positioned within the template 15.

[0042] like Figure 9 As shown, the present invention also provides a construction method for large-span stiffened concrete beams, comprising the following steps:

[0043] (1) Construction preparation: Familiarize yourself with the drawings, cooperate with the steel structure production unit to complete the segmented design of steel beams, re-inspect the quality of steel materials, and participate in the processing, welding and installation of steel structures.

[0044] (2) Construction of steel column: After the positioning measurement and layout are completed, the upper positioning plate 3 and the lower positioning bracket 4 are welded on the side of the steel column 2 according to the size of the first and last steel beams 5, so as to facilitate the subsequent hoisting construction of the steel beam 19; then the steel column 2 is hoisted and welded to the steel column pre-embedded section on the rigid concrete column 1 after verticality correction.

[0045] (3) Hoisting of the first and last steel beams: The hoisting equipment is a tower crane for on-site construction. The hoisting positioning sub-device 8 is fixed to the edge of the upper flange plate of the first and last steel beams 5 by the sub-device fixing bolt 13. When the hoisting positioning sub-device 8 is fixed, the edge of the upper flange plate of the first and last steel beams 5 is inserted into the first slot on the hoisting positioning sub-device 8 and then the sub-device fixing bolt 13 is tightened so that the sub-device fixing bolt 13 is pressed against the upper flange plate of the first and last steel beams 5. The hoisting positioning sub-device 8 is connected to the hoisting equipment. One side of the first and last steel beams 5 is hoisted and positioned between the upper positioning plate 3 and the lower positioning bracket 4. One side of the first and last steel beams 5 is in contact with the side of the steel column 2. After the first and last steel beams 5 are hoisted into place, the elevation and axis error are checked and corrected. Then the first and last steel beams 5 are welded and fixed to the steel column 2 and the lower positioning bracket 4.

[0046] (4) Lifting of the intermediate steel beam: The lifting positioning device 9 is fixed to the edge of the upper flange plate of the intermediate steel beam 6 by the fixing bolt 10 of the device; when the lifting positioning device 9 is fixed, the edge of the upper flange plate of the intermediate steel beam 6 is inserted into the second slot on the lifting positioning device 9, and then the positioning bolt 11 of the device is tightened, so that the positioning bolt 11 of the device presses against the upper flange plate of the first and last steel beams 5, and the lifting positioning device 9 is partially suspended to the outer side of the end of the intermediate steel beam 6; then the lifting positioning device 9 is connected to the lifting equipment, and the lifting equipment is used to lift the intermediate steel beam 6. When the intermediate steel beam 6 is close to the first and last steel beams 5, the lifting positioning connecting screw 12 is used to lift the intermediate steel beam 6. The hoisting and positioning main device 9 is connected to the hoisting and positioning sub-device 8 on the first and last steel beams 5. The hoisting and positioning connecting screw 12 passes through the connecting holes on the first and second connecting plates. The hoisting and positioning connecting screw 12 is connected to a locking nut. The axial distance between the middle steel beam 6 and the first and last steel beams 5 is adjusted by the positioning connecting screw 12 to assist in hoisting and positioning. The edge of the upper flange plate of the first and last steel beams 5 is inserted into the second slot on the hoisting and positioning main device 9. After the middle steel beam 6 is accurately positioned, the positioning bolt 11 of the main device is tightened. The positioning bolt 11 of the main device tightens the first and last steel beams 5, realizing the positioning connection between the middle steel beam 6 and the first and last steel beams 5, which facilitates subsequent welding construction.

[0047] The intermediate steel beams 6 were positioned and hoisted in the same manner to achieve the positioning connection between adjacent intermediate steel beams 6.

[0048] (5) Steel beam assembly: The edges of the upper and lower flange plates of the first and last steel beams 5 and the middle steel beams 6 are connected by bevel welding. The edges of the upper and lower flange plates of adjacent middle steel beams 6 are connected by bevel welding. When welding, the lower flange plate is welded first, and then the upper flange plate is welded. The web plates of adjacent middle steel beams 6 are reinforced and connected by reinforcing ribs 7. The web plates of the middle steel beams 6 are provided with bolt through holes corresponding to the bolt connection holes 14 on the reinforcing ribs 7. The high-strength bolts pass through both the bolt connection holes 14 and the bolt through holes. The connection between the reinforcing ribs 7 and the web plates of the middle steel beams 6 is achieved by the high-strength bolts.

[0049] (6) Reinforcement binding of stiffened beams: According to the steel structure and beam reinforcement drawings, three-dimensional pre-layout of steel column 2, first and last steel beam 5, middle steel beam 6 and reinforcement is carried out. The reinforcement can be installed by anchoring with anchor plate or by welding with steel structure. At the joint of stiffened concrete beam and column, when the longitudinal reinforcement of beam cannot pass through the column steel skeleton, after confirmation and consent by the design unit, the longitudinal reinforcement of beam is bent up along the surface of column steel skeleton and lap plate is welded on the surface of steel column. The longitudinal reinforcement is welded to the lap plate and the surface of column steel skeleton.

[0050] (7) Steel beam formwork erection: The bottom of the ring anchor 18 is welded to the web, top plate and bottom plate of the middle section steel beam 6 and the first and last section steel beam 5 to avoid structural weakness caused by the opening of the steel beam 19; the formwork 15 is set on the outside of the middle section steel beam 6 and the first and last section steel beam 5, and then one end of the L-shaped tie bolt is passed through the hole on the formwork 15 and threadedly connected to the formwork fixing nut 16. The formwork fixing nut 16 is located on the outside of the formwork; the L-shaped structure of the other end of the L-shaped tie bolt is inserted into the ring anchor 18 by free rotation and connected to the ring anchor 18. The L-shaped structure can be adjusted horizontally and vertically in a wide range, which solves the problem of re-opening the formwork due to inaccurate position and inability to adjust; tighten the formwork fixing nut 16 so that the L-shaped tie bolt 17 overlaps and is fastened to the ring anchor 18 to form a tie system between the formwork 15 and the steel beam 19. The steel beam is centered in the formwork through the L-shaped tie bolt 17.

[0051] (8) Concrete pouring: Stiff concrete is poured in formwork 15, and after the concrete is formed, a large-span stiff concrete beam is formed. The strength grade of stiff concrete is C40. Small-sized aggregate with good gradation is selected. The mix design takes into account the improvement of workability. Small-diameter vibrators are used for concrete vibration, and the vibration time is appropriately increased.

Claims

1. A construction method for large-span stiffened concrete beams, characterized in that, The specific steps include the following: Step 1) Construction preparation: Familiarize yourself with the drawings, cooperate with the steel structure production unit to complete the segmented design of the steel beams, re-inspect the quality of the steel materials, and participate in the processing, welding and installation of the steel structure; Step 2) Construction of steel column: After the positioning measurement and layout are completed, according to the size of the first and last steel beams (5), the positioning plate (3) and the lower positioning bracket (4) are welded on the side of the steel column (2), and then the steel column (2) is hoisted and vertically installed on the reinforced concrete column (1). Step 3) Hoisting of the first and last steel beams: The hoisting positioning sub-device (8) is fixed to the edge of the upper flange plate of the first and last steel beams (5) by the sub-device fixing bolts (13); the hoisting positioning sub-device (8) is connected to the hoisting lifting equipment, and the first and last steel beams (5) are hoisted and positioned on one side between the upper positioning plate (3) and the lower positioning bracket (4). After the first and last steel beams (5) are hoisted into place, the elevation and axis error are checked and corrected. Then the first and last steel beams (5) are welded and fixed to the steel column (2) and the lower positioning bracket (4). Step 4) Lifting of the intermediate steel beam: The lifting positioning mother device (9) is fixed to the edge of the upper flange plate of the intermediate steel beam (6) by the mother device fixing bolt (10); then the lifting positioning mother device (9) is connected to the lifting equipment, and the lifting equipment is used to lift the intermediate steel beam (6). When the intermediate steel beam (6) is close to the first and last steel beams (5), the lifting positioning mother device (9) is connected to the lifting positioning sub-device (8) on the first and last steel beams (5) by the lifting positioning connecting screw (12); the lifting positioning sub-device (8) is provided with a first connecting plate, and the lifting positioning mother device (9) is provided with a second connecting plate. Both the first and second connecting plates are provided with connecting holes. The lifting positioning connecting screw (12) passes through the first connecting plate and the second connecting plate at the same time. The connecting hole on the second connecting plate is connected to the locking nut on the hoisting positioning connecting screw (12). The axial distance between the middle section steel beam (6) and the first and last section steel beams (5) is adjusted by the positioning connecting screw (12). The hoisting positioning mother device (9) is provided with a second slot. The two sides of the second slot are connected with the mother device fixing bolt (10) and the mother device positioning bolt (11). The upper flange edge of the first and last section steel beams (5) is inserted into the second slot on the hoisting positioning mother device (9). After the middle section steel beam (6) is accurately positioned, the mother device positioning bolt (11) set on the positioning mother device (9) is tightened. The mother device positioning bolt (11) presses the first and last section steel beams (5) together to realize the positioning connection between the middle section steel beam (6) and the first and last section steel beams (5). The intermediate steel beams (6) are positioned and hoisted in the same manner to achieve the positioning connection between adjacent intermediate steel beams (6); Step 5) Steel beam assembly: The edges of the upper and lower flanges of the first and last steel beams (5) and the middle steel beams (6) are connected by bevel welding. The edges of the upper and lower flanges of the adjacent middle steel beams (6) are connected by bevel welding. The webs of the adjacent middle steel beams (6) are connected by reinforcing ribs (7). Step 6) Binding of reinforcing bars for the stiffening beam; Step 7) Steel beam formwork erection: Weld the bottom of the annular anchor (18) to the web, top plate and bottom plate of the middle section steel beam (6) and the first and last section steel beams (5); Set up formwork (15) on the outside of the middle section steel beam (6) and the first and last section steel beams (5), then pass one end of the L-shaped tie bolt through the hole on the formwork (15) and thread it with the formwork fixing nut (16), the formwork fixing nut (16) is located on the outside of the formwork; Set up an L-shaped structure on the other end of the L-shaped tie bolt, the L-shaped structure passes through the annular anchor (18) and is connected to the annular anchor (18); Tighten the formwork fixing nut (16) so that the L-shaped tie bolt (17) and the annular anchor (18) overlap and twist together to form a tie system between the formwork (15) and the steel beam (19); Step 8) Concrete pouring: Pour stiff concrete into the formwork (15), and after the concrete is formed, a large-span stiff concrete beam is formed.

2. The construction method for large-span stiffened concrete beams according to claim 1, characterized in that, In step (2), a pre-embedded section of steel column is pre-embedded in the reinforced concrete column (1). When the steel column (2) is installed, the lower end of the steel column (2) is welded to the pre-embedded section of steel column.

3. The construction method for large-span stiffened concrete beams according to claim 1, characterized in that, The hoisting and positioning sub-device (8) is provided with a first slot, and a sub-device fixing bolt (13) is connected to one side of the first slot.

4. The construction method for large-span stiffened concrete beams according to claim 3, characterized in that, In step (3), when the hoisting positioning sub-device (8) is fixed, the edge of the upper flange plate of the first and last steel beams (5) is inserted into the first slot on the hoisting positioning sub-device (8), and then the sub-device fixing bolt (13) is tightened so that the sub-device fixing bolt (13) presses against the upper flange plate of the first and last steel beams (5).

5. The construction method for large-span stiffened concrete beams according to claim 3, characterized in that, In step 4), when the hoisting positioning mother device (9) is fixed, the edge of the upper flange plate of the middle section steel beam (6) is inserted into the second slot on the hoisting positioning mother device (9), and the positioning bolt (11) of the mother device is tightened, so that the positioning bolt (11) of the mother device presses against the upper flange plate of the first and last section steel beams (5), and the hoisting positioning mother device (9) is partially suspended to the outside of the end of the middle section steel beam (6).

6. The construction method for large-span stiffened concrete beams according to claim 1, characterized in that, In step 5), the reinforcing rib (7) is provided with several bolt connection holes (14), and the web of the intermediate steel beam (6) is provided with bolt through holes corresponding to the bolt connection holes (14) on the reinforcing rib (7). The high-strength bolt passes through both the bolt connection holes (14) and the bolt through holes, and the connection between the reinforcing rib (7) and the web of the intermediate steel beam (6) is realized through the high-strength bolt.

7. The construction method for large-span stiffened concrete beams according to claim 1, characterized in that, In step 8), when pouring the stiffened concrete, the strength grade of the stiffened concrete is C40, and a small-diameter vibrator is used to vibrate the concrete.

8. A large-span stiffened concrete beam structure, characterized in that, It is constructed using the construction method for large-span stiffened concrete beams as described in any one of claims 1-7.

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