Prefabricated prestressed concrete beam and steel-concrete composite beam spliced ​​bridge and construction method

Abstract

A prefabricated prestressed concrete beam and steel-concrete composite beam spliced ​​bridge and construction method, the spliced ​​bridge is composed of a prefabricated concrete box beam / T beam and a steel box beam / I-beam steel-concrete composite beam directly connected. The construction method is: make a prefabricated concrete box beam / T beam in a prefabrication yard near the construction site; make a steel box beam / I-beam steel-concrete composite beam in a factory; pre-tension the prestressed steel bars, butt the prefabricated concrete box beam / T beam with the steel box beam / I-beam steel-concrete composite beam, insert the high-strength bolts into the bolt holes and fix them with nuts; the prestressed steel bars pass through the prestressed steel bar holes and are fixed with anchors; the end steel plates and anchoring steel plates of the steel-concrete composite beam are encapsulated with post-cast concrete; in the form of using precision-rolled bolts, when the two beams are butt-jointed, the precision-rolled bolts will be inserted into the bolt holes, fixed with nuts and encapsulated with concrete; in the form of using prestressed anchor cables, after the two beams are butt-jointed, the prestressed anchor cables are inserted and fixed at both ends and encapsulated with concrete.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge engineering, and in particular relates to a prefabricated prestressed concrete beam and steel-concrete composite beam spliced ​​bridge and a construction method. Background Art

[0002] Precast concrete beams can be divided into precast concrete box beams and precast concrete T beams according to the different beam types. Precast concrete beams refer to concrete beams that are pre-made in an independent site. They can be erected after the lower part of the bridge is completed in combination with a bridge-erecting machine, which can effectively speed up the project progress and save construction time.

[0003] Precast concrete box girders can be divided into two types according to different materials. One is precast reinforced concrete box girder, and the other is precast prestressed reinforced concrete box girder. Precast prestressed reinforced concrete box girder is precast reinforced concrete box girder with prestress added on the basis of precast reinforced concrete box girder. Some precast prestressed reinforced concrete box girders are not only prestressed longitudinally, but also need to add prestress in the transverse direction. However, since the cross section of the load-bearing structure of the precast concrete box girder is a closed box section, the construction of the precast reinforced concrete box girder is relatively complicated, and the installation weight of a single box girder is usually large. Despite the high construction cost, precast reinforced concrete box girders are still widely used in bridges. Precast reinforced concrete box girders are mainly composed of top plate, bottom plate, web plate and other parts. The top plate and bottom plate are the main working components of the bridge structure to withstand positive and negative bending moments. The role of the web plate is to withstand the section shear stress and main tensile stress. These advantages make precast reinforced concrete box girders widely used in bridge structures.

[0004] Precast concrete T-beams can be divided into precast ordinary concrete T-beams and precast prestressed concrete T-beams. Precast prestressed concrete T-beams can be divided into two types according to the different prestressing forms: one is bonded precast prestressed concrete T-beams, and the other is unbonded precast prestressed concrete T-beams. Generally speaking, the common span of precast ordinary concrete T-beams is 7 to 20m, while the common span of precast prestressed concrete T-beams is 20 to 50m. Among them, the widening of the horseshoe-shaped section is designed for the needs of prestressing. Although the cross-sectional shape of precast concrete T-beams is not stable enough, resulting in the need for temporary support and fixation during transportation and placement, precast ordinary concrete T-beams and precast prestressed concrete T-beams are still widely used in bridges.

[0005] Steel-concrete composite beams are a type of composite beam that connects steel box beams and concrete flange plates through shear connectors to coordinate stress and deformation. They can fully utilize the superior tensile properties of steel and the superior compressive properties of concrete. This type of composite beam is a common structural form for long-span bridges, which has led to the application of steel-concrete composite beams in many bridges. The cross-sectional shapes of steel-concrete composite beams are mainly divided into steel box beam cross-sectional shapes and I-beam cross-sectional shapes. Both types of composite beams are common structural forms for long-span bridges.

[0006] Although precast concrete box girders / T-beams and steel box girders / I-section steel-concrete composite beams are used in many bridges, due to the structure and stress characteristics of precast concrete box girders / T-beams, they are subject to span restrictions in many actual projects, thus limiting their scope of use. In order to solve this practical problem, steel box girders / I-section steel-concrete composite beams can be used to replace or partially replace precast concrete box girders / T-beams. Considering the high cost of steel beams, steel box girders / I-section steel-concrete composite beams can be used to replace precast concrete box girders / T-beams only in special places where they are needed.

[0007] At present, many bridges have been built in which precast concrete box girders / T-beams are connected with steel box girders / I-section steel-concrete composite beams. The most common form is to place the precast concrete box girders / T-beams and steel box girders / I-section steel-concrete composite beams on the same pier at the connection, or on two independent piers respectively. There is no substantial contact between the precast concrete box girders / T-beams and the steel box girders / I-section steel-concrete composite beams, and only the bridge deck system is connected together.

[0008] The above approach still has certain limitations, because in actual projects, sometimes the same pier cannot be used to simultaneously support precast concrete box beams / T beams and steel box beams / I-section steel-concrete composite beams, or there is no condition to set up two piers separately. In this case, the traditional connection solution cannot be implemented. Summary of the invention

[0009] In view of the problems existing in the prior art, the present invention provides a precast prestressed concrete beam and steel-concrete composite beam spliced ​​bridge and a construction method. When it is impossible to use the same pier to simultaneously support the precast concrete box beam / T beam and the steel box beam / I-section steel-concrete composite beam, or when there is no condition to separately set two piers, the precast concrete box beam / T beam and the steel box beam / I-section steel-concrete composite beam can be directly connected without piers.

[0010] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a precast prestressed concrete beam and steel-concrete composite beam spliced ​​bridge, comprising a precast prestressed concrete beam and a steel-concrete composite beam, wherein the precast prestressed concrete beam adopts a precast concrete box beam or a precast concrete T-beam, and the steel-concrete composite beam adopts a steel-concrete composite beam with a steel box beam section or a steel-concrete composite beam with an I-beam section; a direct connection structure is adopted between the precast prestressed concrete beam and the steel-concrete composite beam; and the precast prestressed concrete beam and the steel-concrete composite beam adopt an equal height form or a non-equal height form.

[0011] An end concrete block is fixedly arranged at the end of the prefabricated prestressed concrete beam, a high-strength bolt is pre-embedded in the end concrete block, a prestressed steel bar is prefabricated inside the prestressed concrete beam, and a corrugated pipe is prefabricated outside the prestressed steel bar.

[0012] An end steel plate is fixedly provided at the end of the steel beam of the steel-concrete composite beam, an anchor steel plate is provided behind the end steel plate, and the space between the end steel plate and the anchor steel plate is filled with post-cast concrete; a shear connector is fixedly provided inside the precast concrete slab of the steel-concrete composite beam, and the shear connector is welded to the top end of the steel beam of the steel-concrete composite beam; the high-strength bolt passes through the bolt hole on the end steel plate and is fixedly connected to the end steel plate; the prestressed steel bar passes through the prestressed steel bar holes on the end steel plate and the anchor steel plate, and is fixed on the anchor steel plate.

[0013] The precast prestressed concrete beam and the precast concrete slab of the steel-concrete composite beam are fixedly connected by precision-rolled bolts or prestressed anchor cables.

[0014] When the precast prestressed concrete beam and the precast concrete slab of the steel-concrete composite beam are fixedly connected by the precision-rolled bolts, the precision-rolled bolts are embedded in the upper flange of the precast prestressed concrete beam, a precision-rolled bolt insertion hole is provided in the precast concrete slab of the steel-concrete composite beam, and a reserved concrete post-casting groove is provided on the precast concrete slab at the rear end of the precision-rolled bolt insertion hole.

[0015] When the precast prestressed concrete beam and the precast concrete slab of the steel-concrete composite beam are fixedly connected by prestressed anchor cables, prestressed anchor cable insertion holes are provided in the upper flange of the precast prestressed concrete beam and in the precast concrete slab of the steel-concrete composite beam, and reserved anchor grooves are provided on the upper flange of the precast prestressed concrete beam and on the precast concrete slab of the steel-concrete composite beam at both ends of the prestressed anchor cable insertion holes.

[0016] The construction method of the prefabricated prestressed concrete beam and steel-concrete composite beam spliced ​​bridge comprises the following steps:

[0017] Step 1: Make precast concrete box beam or precast concrete T beam;

[0018] When making precast concrete box girders, the steps are:

[0019] ① Select a prefabrication yard or temporary storage yard near the construction site and set up a prefabrication pedestal in the prefabrication yard or temporary storage yard;

[0020] ②. Make the template according to the design requirements; at the same time, tie the steel bars on the prefabricated pedestal to form a steel cage;

[0021] ③. Install and fix the template;

[0022] ④. Arrange prestressed steel bars at the bottom of the box chamber of the precast concrete box beam according to the design requirements; at the same time, arrange precision-rolled bolts in the upper flange of the precast concrete box beam, or arrange embedded molds or corrugated pipes to form prestressed anchor cable installation holes;

[0023] ⑤. Pour concrete into the formwork until the concrete solidifies and takes shape;

[0024] ⑥. Arrange high-strength bolts at the ends of precast concrete box beams;

[0025] ⑦. Pour concrete into the end of the precast concrete box girder with high-strength bolts until the concrete is solidified and the high-strength bolts are fixed in the end concrete blocks. The precast concrete box girder is completed.

[0026] When making precast concrete T-beams, the steps are:

[0027] ① Select a prefabrication yard or temporary storage yard near the construction site and set up a prefabrication pedestal in the prefabrication yard or temporary storage yard;

[0028] ②. Make the template according to the design requirements; at the same time, tie the steel bars on the prefabricated pedestal to form a steel cage;

[0029] ③. Install and fix the template;

[0030] ④. Arrange prestressed steel bars at the bottom of the web of the precast concrete T-beam according to the design requirements; at the same time, arrange precision-rolled bolts in the upper flange of the precast concrete T-beam, or arrange embedded molds or corrugated pipes to form prestressed anchor cable installation holes;

[0031] ⑤. Pour concrete into the formwork until the concrete solidifies and takes shape;

[0032] ⑥. Arrange high-strength bolts at the ends of precast concrete T-beams;

[0033] ⑦. Pour concrete into the end of the precast concrete T-beam with high-strength bolts until the concrete solidifies and forms, so that the high-strength bolts are fixed in the end concrete block, and the precast concrete T-beam is completed;

[0034] Step 2: Make a steel-concrete composite beam with a steel box beam section or a steel-concrete composite beam with an I-beam section;

[0035] When making a steel-concrete composite beam with a steel box beam section, the steps are:

[0036] ①. Select the factory that manufactures steel-concrete composite beams with steel box beam sections;

[0037] ②. Weld shear connectors on the top of the steel beam of the steel-concrete composite beam with steel box beam section;

[0038] ③. Arrange a pre-buried mold or corrugated pipe at the top of the steel beam of the steel-concrete composite beam with a steel box beam section to form a precision-rolled bolt insertion hole or a prestressed anchor cable insertion hole;

[0039] ④. Pour concrete on the top of the steel beam until the concrete solidifies and forms a precast concrete slab. The precast concrete slab is made in a factory or on the construction site;

[0040] ⑤. Weld the end steel plate at the end of the steel-concrete composite beam with steel box beam section, and the end steel plate is processed with bolt holes and prestressed steel bar holes according to design requirements;

[0041] ⑥. Anchor steel plates are welded behind the end steel plates according to the design requirements, and prestressed steel bar holes are processed on the anchor steel plates according to the design requirements. At this time, the steel-concrete composite beam with steel box girder section is completed;

[0042] When making an I-beam steel-concrete composite beam, the steps are:

[0043] ①. Select the factory that manufactures I-section steel-concrete composite beams;

[0044] ②. Weld shear connectors on the top of the I-section steel-concrete composite beam;

[0045] ③. Arrange a pre-buried mold or corrugated pipe at the top of the steel beam of the I-section steel-concrete composite beam to form a precision-rolled bolt insertion hole or a prestressed anchor cable insertion hole;

[0046] ④. Pour concrete on the top of the steel beam until the concrete solidifies and forms a precast concrete slab. The precast concrete slab is made in a factory or on the construction site;

[0047] ⑤. Weld the end steel plate at the end of the I-section steel-concrete composite beam, and the end steel plate is processed with bolt holes and prestressed steel bar holes according to the design requirements;

[0048] ⑥. Anchor steel plates are welded behind the end steel plates according to the design requirements, and prestressed steel bar holes are processed on the anchor steel plates according to the design requirements. At this time, the I-section steel-concrete composite beam is completed;

[0049] Step 3: pre-tension the prestressed steel bars, then butt the prefabricated prestressed concrete beam with the steel-concrete composite beam, insert the high-strength bolts into the bolt holes of the end steel plates, and use nuts to fix the high-strength bolts and the end steel plates together; at the same time, pass the tensioned prestressed steel bars through the prestressed steel bar holes of the end steel plates and the anchor steel plates in turn, and use anchors to fix the prestressed steel bars and the anchor steel plates together;

[0050] Step 4: Fill and seal the space between the end steel plate and the anchor steel plate with post-poured concrete;

[0051] Step 5: When the upper flange of the precast concrete box beam or precast concrete T beam is provided with finishing bolts, and the precast concrete slab of the steel box beam section steel-concrete composite beam or the I-beam section steel-concrete composite beam is provided with finishing bolt insertion holes, the finishing bolts will be inserted into the finishing bolt insertion holes simultaneously when the precast prestressed concrete beam and the steel-concrete composite beam are butt-jointed. At this time, the finishing bolts will be fixed to the reserved concrete post-casting groove by nuts; when the upper flange of the precast concrete box beam or precast concrete T beam is provided with finishing bolt insertion holes, the finishing bolts will be inserted into the finishing bolt insertion holes simultaneously when the precast prestressed concrete beam and the steel-concrete composite beam are butt-jointed. When precast concrete slabs of steel-concrete composite beams with steel box beam sections or steel-concrete composite beams with I-beam sections are prefabricated with prestressed anchor cable installation holes, after the precast prestressed concrete beams and the steel-concrete composite beams are connected, the prestressed anchor cables are inserted into the prestressed anchor cable installation holes, and the prestressed anchor cables are fixed to the reserved anchor grooves by anchors; finally, concrete is poured into the reserved concrete post-casting grooves or the reserved anchor grooves to complete the encapsulation. At this time, the construction of the spliced ​​bridge of precast prestressed concrete beams and steel-concrete composite beams is completed.

[0052] Beneficial effects of the present invention:

[0053] The precast prestressed concrete beam and steel-concrete composite beam spliced ​​bridge and construction method of the present invention can directly connect the precast concrete box beam / T beam and the steel box beam / I-section steel-concrete composite beam without piers when the same pier cannot be used to simultaneously support the precast concrete box beam / T beam and the steel box beam / I-section steel-concrete composite beam, or when the conditions for separately setting two piers are not met. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 It is a structural schematic diagram of a prefabricated prestressed concrete beam and steel-concrete composite beam spliced ​​bridge (equal height form + precision-rolled bolts) of the present invention;

[0055] Figure 2 It is a structural schematic diagram of a prefabricated prestressed concrete beam and steel-concrete composite beam spliced ​​bridge (equal height form + prestressed anchor cable) of the present invention;

[0056] Figure 3 It is a structural schematic diagram of a prefabricated prestressed concrete beam and steel-concrete composite beam spliced ​​bridge (non-equal height form + precision-rolled bolts) of the present invention;

[0057] Figure 4 It is a structural schematic diagram of a prefabricated prestressed concrete beam and steel-concrete composite beam spliced ​​bridge (non-equal height form + prestressed anchor cable) of the present invention;

[0058] Figure 5 for Figure 1 Middle AA section view (I-beam steel-concrete composite beam);

[0059] Figure 6 for Figure 1 Middle AA section view (steel box girder section steel-concrete composite beam);

[0060] Figure 7 for Figure 2 Middle BB section view (I-beam steel-concrete composite beam);

[0061] Figure 8 for Figure 2 Middle BB section view (steel box girder section steel-concrete composite beam);

[0062] Fig. 9 It is a structural schematic diagram of the prefabricated prestressed concrete beam (finished rolling bolts) of the present invention;

[0063] Fig.10 for Fig. 9 Middle DD section view (precast concrete box girder);

[0064] Fig.11 for Fig. 9 Middle DD section view (precast concrete T beam);

[0065] Fig.12 for Fig. 9 Middle EE section view (precast concrete box girder);

[0066] Fig.13 for Fig. 9 Middle EE section view (precast concrete T beam);

[0067] Fig.14 It is a structural schematic diagram of a prefabricated prestressed concrete beam (prestressed anchor cable) of the present invention;

[0068] Fig.15 for Fig.14 Middle FF section view (precast concrete box girder);

[0069] Fig.16 for Fig.14 Medium FF section view (precast concrete T beam);

[0070] Fig.17 It is a structural schematic diagram of the steel-concrete composite beam (finished rolling bolts) of the present invention;

[0071] Fig.18 for Fig.17 Middle JJ section view (precast concrete box girder);

[0072] Fig.19 for Fig.17 Middle JJ section view (precast concrete T beam);

[0073] Fig. 20 for Fig.17 Middle KK section view (precast concrete box girder);

[0074] Fig.21 for Fig.17 Middle KK section view (precast concrete T beam);

[0075] Fig. 22 It is a structural schematic diagram of the steel-concrete composite beam (prestressed anchor cable) of the present invention;

[0076] Fig.23 for Fig. 22 Middle LL section view (precast concrete box girder);

[0077] Fig.24 for Fig. 22 Middle LL section view (precast concrete T-beam);

[0078] In the figure, 1 is a precast concrete slab, 2 is a steel beam, 3 is a shear connector, 4 is a precision-rolled bolt, 5 is a precast prestressed concrete beam, 6 is a prestressed steel bar, 7 is a high-strength bolt, 8 is an end steel plate, 9 is an anchoring steel plate, 10 is a post-cast concrete, 11 is an end concrete block, 12 is a precision-rolled bolt insertion hole, 13 is a prestressed anchor cable, 14 is a reserved concrete post-cast groove, 15 is a prestressed anchor cable insertion hole, 16 is a bolt hole, 17 is a prestressed steel bar hole, and 19 is a reserved anchor groove. DETAILED DESCRIPTION

[0079] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0080] like Figures 1 to 24 As shown, a precast prestressed concrete beam and steel-concrete composite beam spliced ​​bridge comprises a precast prestressed concrete beam 5 and a steel-concrete composite beam, wherein the precast prestressed concrete beam adopts a precast concrete box beam or a precast concrete T-beam, and the steel-concrete composite beam adopts a steel-concrete composite beam with a steel box beam section or a steel-concrete composite beam with an I-beam section; a direct connection structure is adopted between the precast prestressed concrete beam 5 and the steel-concrete composite beam; and the precast prestressed concrete beam 5 and the steel-concrete composite beam adopt an equal height form or a non-equal height form.

[0081] An end concrete block 11 is fixedly provided at the end of the prefabricated prestressed concrete beam 5 , a high-strength bolt 7 is pre-embedded in the end concrete block 11 , a prestressed steel bar 6 is prefabricated inside the prestressed concrete beam 1 , and a corrugated pipe is prefabricated outside the prestressed steel bar 6 .

[0082] An end steel plate 8 is fixedly provided at the end of the steel beam 2 of the steel-concrete composite beam, an anchor steel plate 9 is provided behind the end steel plate 8, and the space between the end steel plate 8 and the anchor steel plate 9 is filled with post-cast concrete 10; a shear connector 3 is fixedly provided inside the precast concrete slab 1 of the steel-concrete composite beam, and the shear connector 3 is welded to the top of the steel beam 2 of the steel-concrete composite beam; the high-strength bolt 7 passes through the bolt hole 16 on the end steel plate 8 and is fixedly connected to the end steel plate 8; the prestressed steel bar 6 passes through the prestressed steel bar hole 17 on the end steel plate 8 and the anchor steel plate 9, and is fixed to the anchor steel plate 9.

[0083] The precast prestressed concrete beam 5 is fixedly connected to the precast concrete slab 1 of the steel-concrete composite beam by means of precision-rolled bolts 4 or prestressed anchor cables 13 .

[0084] When the precast prestressed concrete beam 5 is fixedly connected to the precast concrete slab 1 of the steel-concrete composite beam by the finishing bolts 4, the finishing bolts 4 are embedded in the upper flange of the precast prestressed concrete beam 5, and a finishing bolt insertion hole 12 is provided in the precast concrete slab 1 of the steel-concrete composite beam, and a reserved concrete post-casting groove 14 is provided on the precast concrete slab 1 at the rear end of the finishing bolt insertion hole 12.

[0085] When the precast prestressed concrete beam 5 is fixedly connected to the precast concrete slab 1 of the steel-concrete composite beam by the prestressed anchor cable 13, prestressed anchor cable insertion holes 15 are provided in the upper flange of the precast prestressed concrete beam 5 and in the precast concrete slab 1 of the steel-concrete composite beam, and reserved anchor grooves 19 are provided on the upper flange of the precast prestressed concrete beam 5 and the precast concrete slab 1 of the steel-concrete composite beam at both ends of the prestressed anchor cable insertion holes 15.

[0086] The construction method of the prefabricated prestressed concrete beam and steel-concrete composite beam spliced ​​bridge comprises the following steps:

[0087] Step 1: Make precast concrete box beam or precast concrete T beam;

[0088] When making precast concrete box girders, the steps are:

[0089] ① Select a prefabrication yard or temporary storage yard near the construction site and set up a prefabrication pedestal in the prefabrication yard or temporary storage yard;

[0090] ②. Make the template according to the design requirements; at the same time, tie the steel bars on the prefabricated pedestal to form a steel cage;

[0091] ③. Install and fix the template;

[0092] ④. Arrange prestressed steel bars 6 at the bottom of the box chamber of the precast concrete box beam according to the design requirements; at the same time, arrange precision-rolled bolts 4 in the upper flange of the precast concrete box beam, or arrange embedded molds or corrugated pipes to form prestressed anchor cable insertion holes 15;

[0093] ⑤. Pour concrete into the formwork until the concrete solidifies and takes shape;

[0094] ⑥. Arrange high-strength bolts 7 at the ends of precast concrete box beams;

[0095] 7. Pour concrete into the end of the precast concrete box beam with high-strength bolts 7 until the concrete is solidified and the high-strength bolts 7 are fixed in the end concrete blocks 11. The precast concrete box beam is completed.

[0096] When making precast concrete T-beams, the steps are:

[0097] ① Select a prefabrication yard or temporary storage yard near the construction site and set up a prefabrication pedestal in the prefabrication yard or temporary storage yard;

[0098] ②. Make the template according to the design requirements; at the same time, tie the steel bars on the prefabricated pedestal to form a steel cage;

[0099] ③. Install and fix the template;

[0100] ④. Arrange prestressed steel bars 6 at the bottom of the web of the precast concrete T-beam according to the design requirements; at the same time, arrange precision-rolled bolts 4 in the upper flange of the precast concrete T-beam, or arrange embedded molds or corrugated pipes to form prestressed anchor cable insertion holes 15;

[0101] ⑤. Pour concrete into the formwork until the concrete solidifies and takes shape;

[0102] ⑥. Arrange high-strength bolts 7 at the ends of precast concrete T beams;

[0103] ⑦. Pour concrete into the end of the precast concrete T-beam with high-strength bolts 7 until the concrete is solidified and the high-strength bolts 7 are fixed in the end concrete block 11. The precast concrete T-beam is completed.

[0104] Step 2: Make a steel-concrete composite beam with a steel box beam section or a steel-concrete composite beam with an I-beam section;

[0105] When making a steel-concrete composite beam with a steel box beam section, the steps are:

[0106] ①. Select the factory that manufactures steel-concrete composite beams with steel box beam sections;

[0107] ②, Weld the shear connector 3 on the top of the steel beam 2 of the steel-concrete composite beam with a steel box beam section;

[0108] ③. Arrange a pre-buried mold or a corrugated pipe at the top of the steel beam 2 of the steel-concrete composite beam with a steel box beam section to form a precision-rolled bolt insertion hole 12 or a prestressed anchor cable insertion hole 15;

[0109] ④, pouring concrete on the top of the steel beam 2 until the concrete solidifies and forms a precast concrete slab 1, which is made in a factory or on a construction site;

[0110] ⑤. Weld the end steel plate 8 at the end of the steel-concrete composite beam with a steel box beam section, and the end steel plate 8 is processed with bolt holes 16 and prestressed steel bar holes 17 according to design requirements;

[0111] ⑥, Anchor steel plate 9 is welded behind end steel plate 8 according to design requirements, and prestressed steel bar holes 17 are processed on anchor steel plate 9 according to design requirements. At this time, the steel-concrete composite beam with steel box beam section is completed;

[0112] When making an I-beam steel-concrete composite beam, the steps are:

[0113] ①. Select the factory that manufactures I-section steel-concrete composite beams;

[0114] ②, Weld the shear connector 3 on the top of the steel beam 2 of the I-section steel-concrete composite beam;

[0115] ③. Arrange a pre-buried mold or a corrugated pipe at the top of the steel beam 2 of the I-section steel-concrete composite beam to form a precision-rolled bolt insertion hole 12 or a prestressed anchor cable insertion hole 15;

[0116] ④, pouring concrete on the top of the steel beam 2 until the concrete solidifies and forms a precast concrete slab 1, which is made in a factory or on a construction site;

[0117] ⑤. Weld the end steel plate 8 at the end of the I-section steel-concrete composite beam, and the end steel plate 8 is processed with bolt holes 16 and prestressed steel bar holes 17 according to design requirements;

[0118] ⑥, Anchor steel plate 9 is welded behind end steel plate 8 according to design requirements, and prestressed steel bar holes 17 are processed on anchor steel plate 9 according to design requirements. At this time, the I-section steel-concrete composite beam is completed;

[0119] Step 3: pre-tension the prestressed steel bar 6, then dock the prefabricated prestressed concrete beam 5 with the steel-concrete composite beam, insert the high-strength bolt 7 into the bolt hole 16 of the end steel plate 8, and use the nut to fix the high-strength bolt 7 and the end steel plate 8 together; at the same time, pass the tensioned prestressed steel bar 6 through the prestressed steel bar holes 17 of the end steel plate 8 and the anchor steel plate 9 in turn, and use the anchor to fix the prestressed steel bar 6 and the anchor steel plate 9 together;

[0120] Step 4: Fill and seal the space between the end steel plate 8 and the anchor steel plate 9 with post-cast concrete 10;

[0121] Step 5: When the finishing bolts 4 are arranged in the upper flange of the precast concrete box beam or the precast concrete T beam, and the finishing bolt insertion holes 12 are preset in the precast concrete slab 1 of the steel box beam section steel-concrete composite beam or the I-beam section steel-concrete composite beam, the finishing bolts 4 will be synchronously inserted into the finishing bolt insertion holes 12 when the precast prestressed concrete beam 5 is butt-jointed with the steel-concrete composite beam. At this time, the finishing bolts 4 are fixed to the reserved concrete post-casting groove 14 by nuts; when the upper flange of the precast concrete box beam or the precast concrete T beam, the steel box beam section steel-concrete composite ... When the precast concrete slab 1 of the steel-concrete composite beam with box girder section or the steel-concrete composite beam with I-beam section is prefabricated with prestressed anchor cable insertion holes 15, after the precast prestressed concrete beam 5 and the steel-concrete composite beam are connected, the prestressed anchor cable 13 is inserted into the prestressed anchor cable insertion holes 15, and the prestressed anchor cable 13 is fixed to the reserved anchor groove 19 by an anchor; finally, concrete is poured into the reserved concrete post-casting groove 14 or the reserved anchor groove 19 to complete the encapsulation, and the construction of the spliced ​​bridge of the precast prestressed concrete beam and the steel-concrete composite beam is completed.

[0122] The solutions in the embodiments are not intended to limit the patent protection scope of the present invention. All equivalent implementations or changes that do not deviate from the present invention are included in the patent scope of this case.

Claims

1. A construction method for a precast prestressed concrete beam and a steel-concrete composite beam spliced ​​bridge, wherein the precast prestressed concrete beam and the steel-concrete composite beam spliced ​​bridge comprises a precast prestressed concrete beam and a steel-concrete composite beam, wherein the precast prestressed concrete beam adopts a precast concrete box beam or a precast concrete T beam, and the steel-concrete composite beam adopts a steel-concrete composite beam with a steel box beam section or an I-beam steel-concrete composite beam with a steel-concrete composite beam; a direct connection structure is adopted between the precast prestressed concrete beam and the steel-concrete composite beam; an equal height form is adopted between the precast prestressed concrete beam and the steel-concrete composite beam; or non-equal height form; an end concrete block is fixedly provided at the end of the prefabricated prestressed concrete beam, a high-strength bolt is pre-embedded in the end concrete block, a prestressed steel bar is prefabricated inside the prestressed concrete beam, and a corrugated pipe is prefabricated outside the prestressed steel bar; an end steel plate is fixedly provided at the end of the steel beam of the steel-concrete composite beam, an anchor steel plate is provided behind the end steel plate, and the space between the end steel plate and the anchor steel plate is filled with post-cast concrete; a shear connector is fixedly provided inside the prefabricated concrete plate of the steel-concrete composite beam, and the shear connector is welded to the top of the steel beam of the steel-concrete composite beam; The high-strength bolts pass through the bolt holes on the end steel plates and are fixedly connected to the end steel plates; the prestressed steel bars pass through the prestressed steel bar holes on the end steel plates and the anchor steel plates and are fixed to the anchor steel plates; the precast prestressed concrete beams and the precast concrete slabs of the steel-concrete composite beams are fixedly connected by precision-rolled bolts or prestressed anchor cables; when the precast prestressed concrete beams and the precast concrete slabs of the steel-concrete composite beams are fixedly connected by precision-rolled bolts, the precision-rolled bolts are pre-embedded in the upper flange of the precast prestressed concrete beams, and the precast concrete slabs of the steel-concrete composite beams are fixedly connected by precision-rolled bolts. A finishing bolt insertion hole is provided in the concrete slab, and a reserved concrete post-casting groove is provided on the precast concrete slab at the rear end of the finishing bolt insertion hole; when the precast prestressed concrete beam and the precast concrete slab of the steel-concrete composite beam are fixedly connected by prestressed anchor cables, prestressed anchor cable insertion holes are provided in the upper flange of the precast prestressed concrete beam and the precast concrete slab of the steel-concrete composite beam, and reserved anchor grooves are provided on the upper flange of the precast prestressed concrete beam at both ends of the prestressed anchor cable insertion hole and on the precast concrete slab of the steel-concrete composite beam; it is characterized in that The construction method includes the following steps: Step 1: Make precast concrete box beam or precast concrete T beam; When making precast concrete box girders, the steps are: ① Select a prefabrication yard or temporary storage yard near the construction site and set up a prefabrication pedestal in the prefabrication yard or temporary storage yard; ②. Make the template according to the design requirements; at the same time, tie the steel bars on the prefabricated pedestal to form a steel cage; ③. Install and fix the template; ④. Arrange prestressed steel bars at the bottom of the box chamber of the precast concrete box beam according to the design requirements; at the same time, arrange precision-rolled bolts in the upper flange of the precast concrete box beam, or arrange embedded molds or corrugated pipes to form prestressed anchor cable installation holes; ⑤. Pour concrete into the formwork until the concrete solidifies and takes shape; ⑥. Arrange high-strength bolts at the ends of precast concrete box beams; ⑦. Pour concrete into the end of the precast concrete box girder with high-strength bolts until the concrete is solidified and the high-strength bolts are fixed in the end concrete blocks. The precast concrete box girder is completed. When making precast concrete T-beams, the steps are: ① Select a prefabrication yard or temporary storage yard near the construction site and set up a prefabrication pedestal in the prefabrication yard or temporary storage yard; ②. Make the template according to the design requirements; at the same time, tie the steel bars on the prefabricated pedestal to form a steel cage; ③. Install and fix the template; ④. Arrange prestressed steel bars at the bottom of the web of the precast concrete T-beam according to the design requirements; at the same time, arrange precision-rolled bolts in the upper flange of the precast concrete T-beam, or arrange pre-buried molds or corrugated pipes to form prestressed anchor cable installation holes; ⑤. Pour concrete into the formwork until the concrete solidifies and takes shape; ⑥. Arrange high-strength bolts at the ends of precast concrete T-beams; ⑦. Pour concrete into the end of the precast concrete T-beam with high-strength bolts until the concrete solidifies and forms, so that the high-strength bolts are fixed in the end concrete block, and the precast concrete T-beam is completed; Step 2: Make a steel-concrete composite beam with a steel box beam section or a steel-concrete composite beam with an I-beam section; When making a steel-concrete composite beam with a steel box beam section, the steps are: ①. Select the factory that manufactures steel-concrete composite beams with steel box beam sections; ②. Weld shear connectors on the top of the steel beam of the steel-concrete composite beam with steel box beam section; ③. Arrange a pre-buried mold or corrugated pipe at the top of the steel beam of the steel-concrete composite beam with a steel box beam section to form a precision-rolled bolt insertion hole or a prestressed anchor cable insertion hole; ④. Pour concrete on the top of the steel beam until the concrete solidifies and forms a precast concrete slab. The precast concrete slab is made in a factory or on the construction site; ⑤. Weld the end steel plate at the end of the steel-concrete composite beam with steel box beam section, and the end steel plate is processed with bolt holes and prestressed steel bar holes according to design requirements; ⑥. Anchor steel plates are welded behind the end steel plates according to the design requirements, and prestressed steel bar holes are processed on the anchor steel plates according to the design requirements. At this time, the steel-concrete composite beam with steel box girder section is completed; When making an I-beam steel-concrete composite beam, the steps are: ①. Select the factory that manufactures I-section steel-concrete composite beams; ②. Weld shear connectors on the top of the I-section steel-concrete composite beam; ③. Arrange a pre-buried mold or corrugated pipe at the top of the steel beam of the I-section steel-concrete composite beam to form a precision-rolled bolt insertion hole or a prestressed anchor cable insertion hole; ④. Pour concrete on the top of the steel beam until the concrete solidifies and forms a precast concrete slab. The precast concrete slab is made in a factory or on the construction site; ⑤. Weld the end steel plate at the end of the I-section steel-concrete composite beam, and the end steel plate is processed with bolt holes and prestressed steel bar holes according to the design requirements; ⑥. Anchor steel plates are welded behind the end steel plates according to the design requirements, and prestressed steel bar holes are processed on the anchor steel plates according to the design requirements. At this time, the I-section steel-concrete composite beam is completed; Step 3: pre-tension the prestressed steel bars, then butt the prefabricated prestressed concrete beam with the steel-concrete composite beam, insert the high-strength bolts into the bolt holes of the end steel plates, and use nuts to fix the high-strength bolts and the end steel plates together; at the same time, pass the tensioned prestressed steel bars through the prestressed steel bar holes of the end steel plates and the anchor steel plates in turn, and use anchors to fix the prestressed steel bars and the anchor steel plates together; Step 4: Fill and seal the space between the end steel plate and the anchor steel plate with post-poured concrete; Step 5: When the upper flange of the precast concrete box beam or precast concrete T beam is provided with finishing bolts, and the precast concrete slab of the steel box beam section steel-concrete composite beam or the I-beam section steel-concrete composite beam is provided with finishing bolt insertion holes, the finishing bolts will be inserted into the finishing bolt insertion holes simultaneously when the precast prestressed concrete beam and the steel-concrete composite beam are butt-jointed. At this time, the finishing bolts will be fixed to the reserved concrete post-casting groove by nuts; when the upper flange of the precast concrete box beam or precast concrete T beam is provided with finishing bolt insertion holes, the finishing bolts will be inserted into the finishing bolt insertion holes simultaneously when the precast prestressed concrete beam and the steel-concrete composite beam are butt-jointed. When precast concrete slabs of steel-concrete composite beams with steel box beam sections or steel-concrete composite beams with I-beam sections are prefabricated with prestressed anchor cable installation holes, after the precast prestressed concrete beams and the steel-concrete composite beams are connected, the prestressed anchor cables are inserted into the prestressed anchor cable installation holes, and the prestressed anchor cables are fixed to the reserved anchor grooves by anchors; finally, concrete is poured into the reserved concrete post-casting grooves or the reserved anchor grooves to complete the encapsulation. At this time, the construction of the spliced ​​bridge of precast prestressed concrete beams and steel-concrete composite beams is completed.

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