An assembled steel-concrete composite rigid frame bridge and its construction method

Abstract

The present invention discloses a prefabricated steel-concrete composite rigid frame bridge, which includes a plurality of precast main beam segments, piers, and cross beam segments. Adjacent precast main beam segments are bolted through the cross beam segments, and the piers are inserted into the cross beam segments to form a hidden cross beam structure. By hiding the capping beam into the main beam structure, the building height is reduced and the aesthetics is improved. The hidden cross beam structure is made into a steel prefabricated component, with a small lifting weight and convenient on-site construction. A slot is arranged inside the cross beam segment, and a cross beam shear connector is arranged in the slot. The extending section of the pier is inserted into the slot and rigid connection between the pier and the capping beam is achieved through high-strength concrete slurry. The steel consumption of the structure is reduced by utilizing the system advantages, and the cost is saved. At the same time, a construction method is disclosed. The main manufacturing of the main beam structure is carried out in the prefabrication factory, which is beneficial to ensuring the project quality, applicable to steel-concrete composite beams with a relatively large span, and conducive to giving full play to the structural advantages of the steel-concrete composite beam, having good technical and economic benefits and broad application prospects.

Description

Technical Field

[0001] The present invention relates to the technical field of bridges, and particularly relates to an assembled steel-concrete composite rigid frame bridge and a construction method thereof. Background Art

[0002] Traditional in-situ construction of urban bridges is likely to cause a sudden drop in the traffic capacity of the construction area, affecting the smoothness and safety of the road, and there are also problems such as a large amount of on-site work, low construction efficiency, high overall energy consumption, and serious nuisance to residents. Assembled bridges can significantly accelerate the construction progress, reduce the interference to the existing traffic through industrialized manufacturing and assembled construction of components, and are beneficial to environmental protection.

[0003] In assembled bridges, steel-concrete composite beams are easily designed as assembled components, and steel-concrete composite beams give play to the material advantages of steel and concrete respectively, and are a bridge structure with strong competitiveness. The current commonly used design method for assembled steel-concrete composite continuous beams is to set the main beam as a longitudinally segmented component, and a cap beam structure with a relatively large height needs to be set, which increases the structural height, raises the construction cost, and reduces the aesthetic feeling. Summary of the Invention

[0004] The purpose of the present invention is to provide an assembled steel-concrete composite rigid frame bridge and a construction method thereof to solve the problem of the need to set a cap beam structure with a relatively large height.

[0005] The technical solution adopted to solve the above technical problems: An assembled steel-concrete composite rigid frame bridge includes precast main beam segments, and each precast main beam segment includes a main beam top plate, a main beam bottom plate, main beam webs, a concrete slab, and a plurality of top plate shear connectors. The concrete slab is arranged above the main beam top plate, the top plate shear connectors are welded to the main beam top plate and connect the concrete slab and the main beam top plate into a whole, and the main beam webs are arranged between the main beam top plate and the main beam bottom plate;

[0006] Pier columns with extending sections arranged above; and

[0007] The crossbeam segment includes a crossbeam top plate, a crossbeam bottom plate, crossbeam webs, hole wall steel plates, and crossbeam stiffeners. The pier is located below the crossbeam segment. The transverse position of the pier is at the cross-section of the precast main girder segment. The crossbeam segment is provided with a protruding segment of the main girder. The crossbeam bottom plate is provided with openings. The hole wall steel plates are arranged between the crossbeam webs. A slot hole is formed between the hole wall steel plates and the crossbeam webs. The cross-section position of the main girder web is between the crossbeam stiffener and the hole wall steel plate. The cross-section position of the main girder web is set according to the width of the bridge deck. The protruding segment is inserted into the slot hole. Crossbeam shear connectors are arranged inside the slot hole. The crossbeam top plate is provided with a first grouting hole. The upper end of the pier is provided with a steel plate. The steel plate is transversely arranged and penetrates through the slot hole. The crossbeam segment and the pier are connected by high-strength concrete slurry. Crossbeam shear connectors are arranged on the inner wall of the gap formed between the crossbeam stiffener and the hole wall steel plate. A second grouting hole is arranged on the crossbeam top plate at this position. Self-compacting concrete of a certain height is poured into the interior through the second grouting hole. The precast main girder segment can be divided into a precast end segment and a precast middle girder segment. The main girder top plate and the crossbeam top plate are bolted. The main girder web and the crossbeam web are bolted. The main girder bottom plate and the crossbeam bottom plate are bolted.

[0008] Beneficial effects: By hiding the capping beam into the main girder structure to form a concealed crossbeam structure, the building height is reduced, the aesthetics is improved, and the concealed crossbeam structure is made into a steel precast component with a small lifting weight and convenient on-site construction. Crossbeam shear connectors are arranged inside the slot hole of the crossbeam segment. The external extended steel bars of the pier are inserted into the slot hole and the rigid connection between the pier and the capping beam is realized through high-strength concrete slurry. Utilizing the system advantages, the steel consumption of the structure is reduced and the cost is saved. The transverse position of the pier is below the main girder, which can avoid the chaos of spatial lines, improve the sense of order and then enhance the aesthetics. Moreover, the bridge deck load is transmitted to the pier through the main girder and the crossbeam, and the structural force is more clear. The precast main girder segments are bolted between segments, avoiding the welding quality problems that may be caused by the overhead welding of the bottom plate.

[0009] Furthermore, the precast end segment is divided into a precast end a segment and a precast end b segment. The precast middle girder segment is divided into a precast middle girder a segment and a precast middle girder b segment. Among them, the precast end b segment and the precast middle girder a segment are connected to the crossbeam segment, and the connecting segments between them form a longitudinal connecting segment a. The precast end a segment and the precast end b segment, and the precast middle girder a segment and the precast middle girder b segment form a longitudinal connecting segment b. The adjacent main girder top plates, main girder bottom plates, and main girder webs between the longitudinal connecting segments b are butted against each other and tightly connected by high-strength bolts.

[0010] Furthermore, the main girder web and the crossbeam web are collectively referred to as the web, the main girder bottom plate and the crossbeam bottom plate are collectively referred to as the bottom plate, and the main girder top plate and the crossbeam top plate are collectively referred to as the top plate; a first splicing plate is arranged between the bottom plate and the web between adjacent segments and is fixedly connected by high-strength bolts; a second splicing plate is arranged between the top plates between adjacent segments and is fixedly connected by high-strength bolts. The first splicing plate is an ordinary flat plate splicing plate. The second splicing plate includes a horizontal plate and several vertical plates. The high-strength bolts pass through the top plate and the horizontal plate to connect the top plates between adjacent segments into a whole. Transverse steel bars are arranged in the vertical plates to integrate the concrete slab within the longitudinal connection section with the top plate.

[0011] Furthermore, the bottom plates between the crossbeam segment and the precast main girder segment are fixedly connected by a second splicing plate and high-strength bolts. Transverse steel bars are arranged in the vertical plates of the second splicing plate at this position to form a composite section.

[0012] Furthermore, a crossbeam is arranged between the precast main girder segments.

[0013] Furthermore, the pier column is set as a rectangular structure, and the length of the extending section should not be less than 1.2 times the long side dimension of the pier column.

[0014] Furthermore, the pier column is set as a cylindrical structure, and the extending section is set as circular or rectangular, and its length should not be less than 1.2 times the diameter of the pier column.

[0015] Furthermore, brackets are arranged in the transverse direction of the pier column, and a bearing is arranged above the brackets.

[0016] A construction method for an assembled steel-concrete composite rigid frame bridge includes the following steps:

[0017] S1. Fabricate the crossbeam segment, precast end a segment, precast end b segment, precast middle beam a segment, and precast middle beam b segment;

[0018] S2. Pour or hoist the pier column, install the bearing on the bracket, hoist the crossbeam segment, insert the extending section of the pier column into the slot hole in the crossbeam segment, and pour high-strength concrete slurry into the slot hole from the top first grouting hole to realize the connection between the crossbeam segment and the pier column;

[0019] S3. Realize the connection by pouring high-strength concrete slurry into the steel bar plate arranged horizontally and penetrating the slot hole. Hoist and set temporary piers below the longitudinal connection section a and the longitudinal connection section b. The segments are connected and fixed by the first splicing plate, the second splicing plate, and high-strength bolts, and pour the bottom concrete of the beam;

[0020] S4. Demolish the above-mentioned temporary piers;

[0021] S5. Insert steel bars into the vertical plate of the second splicing plate, screw the tail of the high-strength bolt into the nut, connect the steel bars of the concrete slab, and pour the wet joints of the longitudinal connection section, the wet joints of the transverse connection section and the concrete in the negative moment area.

[0022] S6. Construct the bridge deck and ancillary facilities.

[0023] Beneficial effects: The main fabrication of the main girder structure is carried out in the precast yard, which is beneficial to ensuring the project quality, applicable to steel-concrete composite girders with larger spans, and conducive to giving full play to the structural advantages of steel-concrete composite girders, having good technical and economic benefits and broad application prospects.

[0024] Furthermore, in step S1, when fabricating the precast intermediate girder b segment, use the reaction frame to fix it on the beam tops at both ends of the precast intermediate girder segment b, set jacks at the bottom of the precast intermediate girder b segment and apply a jacking force. When the jacking force reaches the predetermined value, replace it with a mid-span beam bottom support, and then pour the concrete slab at the top. Reinforcing ribs are provided on the bottom slab of the precast intermediate girder b segment. Description of the Drawings

[0025] The following further describes the present invention with reference to the drawings and embodiments:

[0026] Figure 1 It is a sectional view of the precast main girder segment;

[0027] Figure 2 It is a side view at the slot hole;

[0028] Figure 3 It is a cross-sectional view of the pier column;

[0029] Figure 4 It is a sectional view with a cross beam;

[0030] Figure 5 It is a sectional view of the precast main girder segment at a finer segmentation;

[0031] Figure 6 It is a side connection diagram of the precast main girder segment;

[0032] Figure 7 It is a top view of a segment-bolted and welded steel-concrete composite rigid frame bridge. Specific Embodiments

[0033] Refer to Figures 1 to 7 , a construction method for an assembled steel-concrete composite rigid frame bridge, comprising the following steps:

[0034] S1. Fabricate the cross beam segment, the precast end a segment, the precast end b segment, the precast intermediate girder a segment, and the precast intermediate girder b segment;

[0035] S2. Pour or hoist the pier column, install the bearing on the bracket ear, hoist the cross beam segment, insert the extending section of the pier column into the slot hole in the cross beam segment, and pour high-strength concrete slurry into the slot hole from the top first grouting hole to realize the connection between the cross beam segment and the pier column;

[0036] S3. Realize the connection by pouring a steel plate horizontally arranged and penetrating through the slot hole with high-strength concrete slurry. Hoist and set up temporary piers below the longitudinal connection section a and the longitudinal connection section b. The segments are connected and fixed by the first splicing plate 41, the second splicing plate and high-strength bolts 43, and pour the bottom concrete of the beam;

[0037] S4. Demolish the above-mentioned temporary piers;

[0038] S5. Insert steel bars into the vertical plate 422 of the second splicing plate, screw the tail of the high-strength bolt 43 into the nut, connect the steel bars of the concrete slab and pour the longitudinal connection section wet joint, the transverse connection section wet joint and the negative moment zone concrete;

[0039] S6. Construct the bridge deck and auxiliary facilities.

[0040] Preferably, the precast middle beam segment 102 is set as a pre-bent structure. Specifically, in step S1, when manufacturing the precast middle beam b segment 1022, it is fixed on the beam top at both ends of the segment by a reaction frame, a jack is set at the bottom of the precast middle beam b segment 1022 and a jacking force is applied. When the jacking force reaches the predetermined value, it is replaced with a support at the bottom of the mid-span, and then the top concrete slab 14 is poured.

[0041] Preferably, stiffening ribs are provided on the bottom plate of the precast middle beam b segment 1022.

[0042] The precast main beam segment 1 meets the engineering building modulus coordination, which is beneficial to large-scale industrial production. The width of the transverse connection section wet joint 8 is adjustable and suitable for the application of variable-width sections. The main manufacturing of the main beam structure is placed in the precast factory, which is beneficial to ensuring the project quality, suitable for steel-concrete composite beams with larger spans, and is beneficial to giving full play to the structural advantages of the steel-concrete composite beam, having good technical and economic benefits and broad application prospects.

[0043] A prefabricated steel-concrete composite rigid frame bridge includes several precast main girder segments 1, pier columns 3, and crossbeam segments 2. Two adjacent precast main girder segments 1 are bolted through the crossbeam segment 2, and the pier column 3 is inserted into the crossbeam segment 2 to form a concealed crossbeam structure. Specifically, the precast main girder segment 1 includes a main girder top plate 11, a main girder bottom plate 13, main girder webs 12, a concrete slab 14, and several top plate shear connectors. The concrete slab 14 is arranged above the main girder top plate 11. The top plate shear connectors are welded to the main girder top plate 11 and connect the concrete slab 14 and the main girder top plate 11 into a whole. The main girder webs 12 are welded between the main girder top plate 11 and the main girder bottom plate 13. The materials of the main girder top plate 11, the main girder bottom plate 13, and the main girder webs 12 are all steel girders. The pier column 3 is located below the crossbeam segment 2. The transverse position of the pier column 3 is at the cross-section of the precast main girder segment 1, and an extending section 31 is arranged above the pier column 3. The crossbeam segment 2 includes a crossbeam top plate 21, a crossbeam bottom plate 22, crossbeam webs 23, and a hole wall steel plate 24. The crossbeam segment 2 is provided with a main girder extending section for connecting with the precast end segment 101 and the precast middle girder segment 102 to form a main girder structure. The connection position is the longitudinal connection section, and adjacent main girder structures are connected through a transverse connection section to form a bridge span structure. The crossbeam bottom plate 22 is provided with an opening, and the aperture of the opening is slightly larger than the diameter of the pier column 3, so that the extending section 31 of the pier column 3 can be inserted into the crossbeam segment 2. The hole wall steel plate 24 is arranged between the crossbeam webs 23. A slot hole is formed between the hole wall steel plate 24 and the crossbeam webs 23. The cross-section position of the main girder web 12 is between the crossbeam stiffener 25 and the hole wall steel plate 24. The cross-section position of the main girder web 12 is set according to the bridge deck width. Crossbeam shear connectors 26 are welded inside the slot hole. The extending section 31 is inserted into the slot hole. The crossbeam top plate 21 is provided with a first grouting hole. The crossbeam segment 2 and the pier column 3 are connected through high-strength concrete slurry. Crossbeam shear connectors 26 are arranged on the inner wall of the gap formed by the crossbeam stiffener 25 and the hole wall steel plate 24. A second grouting hole is arranged on the crossbeam top plate 21 at this position, and self-compacting concrete of a certain height is poured into the inside through the second grouting hole. By arranging the extending section 31 on the pier column 3 and inserting the extending section 31 into the slot hole, the capping beam is hidden in the main girder structure to form a concealed crossbeam structure, reducing the building height, improving the aesthetics, and making the concealed crossbeam structure into a steel prefabricated part with a small lifting weight and convenient on-site construction. A steel bar plate 27 is arranged at the upper end of the pier column 3. The steel bar plate 27 is arranged horizontally and penetrates through the slot hole. The extending section 31 is inserted into the slot hole and the pier column 3 and the capping beam are rigidly connected through high-strength concrete slurry. Taking advantage of the system, the steel consumption of the structure is reduced and the cost is saved. The precast main girder segment 1 can be divided into a precast end segment 101 and a precast middle girder segment 102. The ones located at both ends of the bridge body are called precast end segments 101, and the rest of the segments are called precast middle girder segments 102.The top plate 11 of the main girder and the top plate 21 of the cross beam are bolted, the web 12 of the main girder and the web 23 of the cross beam are bolted, and the bottom plate 13 of the main girder and the bottom plate 22 of the cross beam are bolted. The precast main girder segments 1 are bolted between segments, avoiding the welding quality problems that may be caused by the overhead welding of the bottom plate.

[0044] Preferably, to adapt to the manufacture of bridges with longer spans, the precast end segment 101 is divided into a precast end a segment 1011 and a precast end b segment 1012. The precast middle girder segment 102 is divided into a precast middle girder a segment 1021 and a precast middle girder b segment 1022. Among them, the precast end b segment 1012, the precast middle girder a segment 1021 are connected to the cross beam segment 2, and the connecting segments between them form a longitudinal connecting segment a. The precast end a segment 1011 and the precast end b segment 1012, the precast middle girder a segment 1021 and the precast middle girder b segment 1022 form a longitudinal connecting segment b. The two main girder top plates 11 between the longitudinal connecting segments b are butt-jointed and bolted and fixed. The adjacent main girder bottom plates 13 and main girder webs 12 between the longitudinal connecting segments b are butt-jointed and tightly connected by high-strength bolts 43. The cast-in-place longitudinal connecting segment b wet joint 7 is formed to form a longitudinal connecting segment; the cast-in-place transverse connecting segment wet joint 8 is formed between adjacent concrete slabs 14 to form a transverse connecting segment.

[0045] Continue to refer to Figure 2 , the main girder web 12 and the cross beam web 23 are collectively referred to as the web, the main girder bottom plate 13 and the cross beam bottom plate 22 are collectively referred to as the bottom plate, and the main girder top plate 11 and the cross beam top plate 21 are collectively referred to as the top plate. Specifically, a first splicing plate 41 is arranged between the bottom plates and webs of adjacent segments and tightly connected by high-strength bolts 43; a second splicing plate is arranged between the top plates of adjacent segments and tightly connected by high-strength bolts 43. The first splicing plate 41 is an ordinary flat plate splicing plate. The second splicing plate includes a horizontal plate 421 and several vertical plates 422. The high-strength bolts 43 pass through the top plate and the horizontal plate 421 to connect the top plates between adjacent segments into a whole. The transverse steel bars 423 are arranged in the vertical plates 422, so that the concrete slab within the longitudinal connecting segment range is connected with the top plate into a whole. The second splicing plate not only realizes the fastening between the top plates and connects the top plate with the post-cast concrete section into a whole, avoids the setting of stud bolts at this position, but also increases the local stiffness. After the overall erection is completed, the temporary pier 6 can be removed, which simplifies the construction and reduces the impact of the construction on the traffic under the bridge. When manufacturing the precast segment, the precast middle girder segment 102 is set as a pre-bent structure, and for the precast middle girder segment 102, the compressive performance of the concrete can be fully utilized and the steel consumption can be reduced.

[0046] Preferably, the bottom plate between the crossbeam segment 2 and the precast main beam segment 1 is tightly connected by a second splicing plate and high-strength bolts 43. Horizontal steel bars 423 are inserted into the vertical plate 422 of the second splicing plate at this position to form a composite section.

[0047] Preferably, to improve the structural stability and increase the area of the compression zone, the width of the top plate at both ends is set to be greater than that in the middle. The top plates at both ends of the precast main beam segment 1 are widened and can be appropriately thickened if necessary. Shear connectors for the top plate are also provided above the widened area of the top plate. The widening of the top plate in combination with the second splicing plate further increases the compression area of the main beam structure. After the connection is completed, the temporary pier 6 below the longitudinal connection section can be removed, greatly reducing the traffic interference to the road below. At the same time, the high-strength bolts 43 not only achieve the fastening between the bottom plate in the negative moment zone and the top plate in the positive moment zone, but also connect the top plate and the post-cast concrete section into a whole, avoiding the setting of stud bolts at this position and simplifying the construction.

[0048] Preferably, the pier column 3 is set as a rectangular structure, and the length of the extending section 31 should not be less than 1.2 times the long side dimension of the pier column 3.

[0049] Preferably, the pier column 3 is set as a cylindrical structure, and the extending section 31 is set as circular or rectangular, and its length should not be less than 1.2 times the diameter of the pier column 3.

[0050] Preferably, the pier column 3 is provided with a bracket 32 in the transverse bridge direction, and a bearing 33 is arranged above the bracket 32. To ensure local stability and transfer concentrated forces, and improve the stability and torsional resistance of the crossbeam segment 2.

[0051] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the scope of knowledge possessed by those of ordinary skill in the art.

Claims

1. An assembled steel-concrete composite rigid frame bridge, characterized in that, Comprising: Prefabricated main girder segments, including a main girder top plate, a main girder bottom plate, main girder web plates, a concrete slab and a plurality of top plate shear connectors. The concrete slab is arranged above the main girder top plate. The top plate shear connectors are welded to the main girder top plate and connect the concrete slab and the main girder top plate into a whole. The main girder web plates are arranged between the main girder top plate and the main girder bottom plate; Pier columns, with extending segments arranged above; and Cross beam segments, including a cross beam top plate, a cross beam bottom plate, cross beam web plates, hole wall steel plates and cross beam stiffeners. The pier columns are located below the cross beam segments. The cross-bridge direction position of the pier columns is at the cross-section of the prefabricated main girder segments. The cross beam segments are provided with main girder extending segments. The cross beam bottom plate is provided with openings. The hole wall steel plates are arranged between the cross beam web plates. A slot hole is formed between the hole wall steel plates and the cross beam web plates. The cross-section position of the main girder web plates is between the cross beam stiffeners and the hole wall steel plates. The cross-section position of the main girder web plates is set according to the bridge deck width. The extending segments are inserted into the slot holes. Cross beam shear connectors are arranged inside the slot holes. The cross beam top plate is provided with first grouting holes. Reinforcing steel plates are arranged at the upper ends of the pier columns. The reinforcing steel plates are arranged horizontally and penetrate through the slot holes. The cross beam segments and the pier columns are connected by high-strength concrete slurry. Cross beam shear connectors are arranged on the inner wall of the gap formed by the cross beam stiffeners and the hole wall steel plates. Second grouting holes are arranged on the cross beam top plate at this position. Self-compacting concrete of a certain height is poured into the inside through the second grouting holes. The prefabricated main girder segments are divided into prefabricated end segments and prefabricated middle girder segments. The main girder top plate and the cross beam top plate are bolted. The main girder web plates and the cross beam web plates are bolted. The main girder bottom plate and the cross beam bottom plate are bolted.

2. The assembled steel-concrete composite rigid frame bridge according to claim 1, wherein: The prefabricated end segments are divided into prefabricated end a segments and prefabricated end b segments. The prefabricated middle girder segments are divided into prefabricated middle girder a segments and prefabricated middle girder b segments. Among them, the prefabricated end b segments, the prefabricated middle girder a segments and the cross beam segments form a longitudinal connection segment a. The prefabricated end a segments and the prefabricated end b segments, the prefabricated middle girder a segments and the prefabricated middle girder b segments form a longitudinal connection segment b; The adjacent main girder top plates, main girder bottom plates and main girder web plates between the longitudinal connection segments b are butted against each other and tightly connected by high-strength bolts.

3. The assembled steel-concrete composite rigid frame bridge according to claim 2, wherein: The main girder web and the cross beam web are collectively referred to as the web, the main girder bottom plate and the cross beam bottom plate are collectively referred to as the bottom plate, and the main girder top plate and the cross beam top plate are collectively referred to as the top plate; a first splicing plate is arranged between the bottom plates and the webs between adjacent segments and is fixedly connected by high-strength bolts; a second splicing plate is arranged between the top plates between adjacent segments and is fixedly connected by high-strength bolts. The first splicing plate is an ordinary flat plate splicing plate. The second splicing plate includes a horizontal plate and several vertical plates. The high-strength bolts pass through the top plate and the horizontal plate to connect the top plates between adjacent segments into a whole. Transverse steel bars are arranged in the vertical plates, so that the concrete slab within the longitudinal connection section is connected with the top plate into a whole.

4. The prefabricated steel-concrete composite rigid frame bridge according to claim 3, wherein: The bottom plates between the cross beam segments and the prefabricated main girder segments are fixedly connected by a second splicing plate and high-strength bolts. Transverse steel bars are arranged in the vertical plates of the second splicing plate at this position to form a composite section.

5. The prefabricated steel-concrete composite rigid frame bridge according to claim 1, wherein: Cross beams are arranged between the prefabricated main girder segments.

6. The prefabricated steel-concrete composite rigid frame bridge according to claim 1, wherein: The pier column is arranged in a rectangular structure, and the length of the extending section shall not be less than 1.2 times the long side dimension of the pier column.

7. The prefabricated steel-concrete composite rigid frame bridge according to claim 1, wherein: The pier column is arranged in a cylindrical structure, and the extending section is arranged in a circular or rectangular shape, and its length shall not be less than 1.2 times the diameter of the pier column.

8. The prefabricated steel-concrete composite rigid frame bridge according to claim 1, wherein: Supports are arranged above the brackets which are arranged transversely on the pier column.

9. A construction method for an assembled steel-concrete composite rigid frame bridge, based on the assembled steel-concrete composite rigid frame bridge described in claim 3, characterized in that, It includes the following steps: S1. Fabricate cross beam segments, prefabricated end a segments, prefabricated end b segments, prefabricated middle beam a segments, and prefabricated middle beam b segments; S2. Pour or hoist the pier column, install the supports on the brackets, hoist the cross beam segments, insert the extending section of the pier column into the slot holes in the cross beam segments, and pour high-strength concrete slurry into the slot holes from the top first grouting holes to realize the connection between the cross beam segments and the pier column; S3. Realize the connection by pouring a steel bar plate which is arranged transversely and penetrates through the slot holes with high-strength concrete slurry. Temporary piers are arranged below the longitudinal connection section a and the longitudinal connection section b during hoisting. The segments are connected and fixed by the first splicing plate, the second splicing plate and high-strength bolts, and the beam bottom concrete is poured; S4. Remove the above-mentioned temporary piers; S5. Insert steel bars into the vertical plates of the second splicing plate, screw the tails of the high-strength bolts into the internal nuts, connect the steel bars of the concrete slab and pour the longitudinal connection section wet joint, the transverse connection section wet joint and the negative moment zone concrete; S6. Construct the bridge deck and ancillary facilities.

10. The construction method of the assembled steel-concrete composite rigid frame bridge according to claim 9, characterized in that: In step S1, when fabricating the prefabricated middle beam b segment, use the reaction frame to fix it on the beam tops at both ends of the fabricated middle beam segment b, set jacks at the bottom of the prefabricated middle beam b segment and apply jacking force. When the jacking force reaches the predetermined value, replace it with a support at the mid-span beam bottom, and then pour the concrete slab at the top. Reinforcing ribs are arranged on the bottom plate of the prefabricated middle beam b segment.

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