Prefabricated assembled multi-limb steel reinforced concrete beam

Abstract

The present invention provides a prefabricated and assembled multi-limb steel reinforced concrete beam, which includes a group of prefabricated side beams with symmetrical structures, and zero, one, or more prefabricated middle beams. When the number of prefabricated middle beams is not zero, they are located in the middle of the symmetrically arranged prefabricated side beams. The steel reinforced concrete beam of the present invention has the advantages of high degree of prefabrication, strong flexibility, safety and reliability.

Description

Technical Field

[0001] The present invention belongs to the field of structural engineering design, and particularly relates to a prefabricated and assembled multi-limb steel reinforced concrete beam. Background Art

[0002] At present, cast-in-place technology is mostly used for steel reinforced concrete beams in China. Its advantages are simple processes, convenient construction, and good integrity. Its disadvantages are large amount of on-site wet work, serious pollution, slow construction speed, and low degree of prefabrication. Moreover, there are only relevant specifications, atlases, and mature practices for single-limb steel reinforced concrete beams under cast-in-place technology in China, and there is no relevant information on prefabricated steel reinforced concrete beams and multi-limb steel reinforced concrete beams. Summary of the Invention

[0003] Aiming at the deficiencies existing in the above-mentioned prior art, the present invention provides a prefabricated and assembled multi-limb steel reinforced concrete beam, which has the advantages of high degree of prefabrication, strong flexibility, safety and reliability.

[0004] The present invention provides the following technical solutions:

[0005] A prefabricated and assembled multi-limb steel reinforced concrete beam includes a group of prefabricated side beams with symmetrical structures, and zero, one, or more prefabricated middle beams. When the number of prefabricated middle beams is not zero, they are located in the middle of the symmetrically arranged prefabricated side beams;

[0006] The structure of the prefabricated side beam includes a single-limb steel section of the side beam. Along the longitudinal direction of the single-limb steel section of the side beam, a number of open stirrups of the side beam are arranged at intervals. The inner stirrups of the side beam cross over the single-limb steel section of the side beam from bottom to top. Along the inner longitudinal direction of the single-limb steel section of the side beam, a number of inner connecting rib plates of the side beam are arranged at intervals for connecting with the connecting structures of other corresponding prefabricated structural blocks. The prefabricated side beam is cast with prefabricated side beam concrete from the bottom upwards and from the edge inwards, pouring all of the single-limb steel section of the side beam and part of the inner stirrups of the side beam into the concrete. The top openings of the inner stirrups of the side beam extend above the prefabricated side beam concrete. At least some connection points of the inner connecting rib plates of the side beam extend outside the prefabricated side beam concrete. An embedded angle steel is also provided at the inner bottom of the prefabricated side beam concrete, and at least a part of the outer surface of the embedded angle steel is exposed outside the prefabricated side beam concrete;

[0007] The precast middle beam structure includes a single-leg section steel for the middle beam, and a number of open stirrups for the middle beam are longitudinally arranged at intervals along the single-leg section steel for the middle beam. The open stirrups for the middle beam are arranged to span over the single-leg section steel for the middle beam from bottom to top. A number of connecting ribs on both sides of the middle beam are longitudinally arranged at intervals along both sides of the single-leg section steel for the middle beam, and are used to connect with the connecting structures of other corresponding precast structural blocks. The precast middle beam is cast with precast middle beam concrete from the bottom upwards, and all of the single-leg section steel for the middle beam and part of the open stirrups for the middle beam are cast inside the concrete. The top openings of the open stirrups for the middle beam extend above the precast middle beam concrete, and at least part of the connection points of the connecting ribs on both sides of the middle beam extend outside the precast middle beam concrete. Embedded angle steels are also provided at the bottom on both sides of the precast middle beam concrete, and at least part of the outer surface of the embedded angle steels is exposed outside the precast middle beam concrete.

[0008] Among them, at least one middle stirrup of the open stirrups for the side beam passes through the single-leg section steel for the side beam from bottom to top; at least one side stirrup of the open stirrups for the side beam is located outside the single-leg section steel for the side beam; at least one inner stirrup of the open stirrups for the side beam is far away from the inner side of the single-leg section steel for the side beam and crosses the connection center of the connection structure between the precast side beam and the corresponding precast structural block.

[0009] Among them, at least one middle stirrup of the open stirrups for the middle beam passes through the single-leg section steel for the middle beam from bottom to top; at least one side stirrup for the middle beam is provided on each side of the open stirrups for the middle beam, far away from both sides of the single-leg section steel for the middle beam and crossing the connection center of the connection structure between the precast middle beam and the corresponding precast structural block.

[0010] After the precast structural blocks are connected to each other, the stirrups within the area between and on both sides of the connection structures can form a basically symmetrical distribution.

[0011] Among them, the inner surface of the precast side beam concrete has side beam key grooves, and side beam stud bolts are evenly distributed on the top of the single-leg section steel for the side beam; the two side surfaces of the precast middle beam concrete have middle beam key grooves, and middle beam stud bolts are evenly distributed on the top of the single-leg section steel for the middle beam.

[0012] Among them, side beam outer stiffening ribs are longitudinally arranged at intervals on the outside of the single-leg section steel for the side beam; both the side beam outer stiffening ribs and the side beam inner connecting ribs are fixedly connected between the upper and lower flanges of the single-leg section steel for the side beam; the connecting ribs on both sides of the middle beam are fixedly connected between the upper and lower flanges of the single-leg section steel for the middle beam.

[0013] Among them, connecting vertical plates are provided between the precast structural blocks, and the corresponding connecting ribs between adjacent precast structural blocks are bolted and fixedly connected through the connecting vertical plates; the embedded angle steels in the precast structural blocks are embedded in the precast side beam concrete or the precast middle beam concrete through angle steel bars.

[0014] Among them, preset lower longitudinal bars and preset waist bars are also embedded in the precast side beam. The preset lower longitudinal bars are longitudinally arranged on the bottom transverse bars of the side beam opening stirrups and are transversely spaced along the bottom transverse bars of the side beam opening stirrups. At least a part of the preset lower longitudinal bars of the side beam are respectively located at the intersections of the bottom horizontal and vertical bars of the side beam opening stirrups. The preset waist bars are longitudinally arranged at the outermost bars of the side beam opening stirrups and are vertically spaced along the outermost bars.

[0015] Preset lower longitudinal bars are also embedded in the precast middle beam. The preset lower longitudinal bars of the middle beam are longitudinally arranged on the bottom transverse bars of the middle beam opening stirrups and are transversely spaced along the bottom transverse bars of the middle beam opening stirrups. At least a part of the preset lower longitudinal bars of the middle beam are respectively located at the intersections of the bottom horizontal and vertical bars of the middle beam opening stirrups.

[0016] Among them, the structure of the present invention further includes a stirrup cap for connecting the upper openings of the opening stirrups in the precast structural blocks. The stirrup caps are staggeredly connected above the precast structural blocks with different lengths, and both ends of the stirrup caps are respectively connected to the stirrup openings of two different precast structural blocks.

[0017] Among them, the structure of the present invention further includes post-set upper longitudinal bars longitudinally arranged at the upper openings of the side beam opening stirrups and / or the middle beam opening stirrups, and post-set lower longitudinal bars longitudinally arranged below the connection structure between the precast structural blocks. The post-set lower longitudinal bars are spaced along the bottom transverse bars of the side beam opening stirrups and / or the middle beam opening stirrups.

[0018] Among them, the structure of the present invention further includes a steel bottom formwork arranged below the connection structure between the precast structural blocks and welded and fixed at the bottom between adjacent embedded angle steels.

[0019] Among them, the structure of the present invention further includes precast composite slabs laid on the upper parts of both sides of the precast side beam. Reinforcing bars are integrally laid on the upper parts of the precast composite slabs. The post-poured concrete pours the interconnected precast structural block structures, precast composite slabs, and the upper reinforcing bars above into an integral structure.

[0020] Compared with the prior art, the advantages and positive effects of the present invention are as follows: The present invention adopts the precast assembly technology, disassembles the conventional single-leg steel reinforced concrete beam into multiple precast single-leg steel reinforced concrete beams, with high degree of prefabrication, light self-weight of single components, less wet concrete work, fast construction speed, safe and reliable connection, can be directly combined with composite slabs, and good comprehensive benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic plan view of the precast side beam of the present invention;

[0022] Figure 2 It is a schematic model view of the precast side beam of the present invention;

[0023] Figure 3 It is a schematic plan view of the precast middle beam of the present invention;

[0024] Figure 4 It is a schematic model view of the precast middle beam of the present invention;

[0025] Figure 5 It is a schematic plan view of the embedded angle steel;

[0026] Figure 6 It is a schematic plan view of the connecting vertical plate;

[0027] Figure 7 It is a schematic exploded plan view of the present invention with one precast middle beam and a group of precast side beams;

[0028] Figure 8 It is for Figure 7 the model diagram of;

[0029] Figure 9 It is a schematic exploded model view of the present invention with one precast middle beam and a group of precast side beams;

[0030] Figure 10 It is for Figure 7 the schematic plan view after assembly;

[0031] Figure 11 It is for Figure 9 the schematic model view after assembly;

[0032] Figure 12 It is a schematic plan view of the present invention with a group of precast side beams;

[0033] Figure 13 It is a schematic plan view of the present invention with two precast middle beams and a group of precast side beams;

[0034] Figure 14 It is a schematic view of a structure before the stirrup cap is connected;

[0035] Figure 15 It is for Figure 14 a schematic view of a structure after the stirrup cap is connected;

[0036] Figure 16 It is a schematic view of the connection structure of the steel bottom form;

[0037] Figure 17 It is a schematic view of a structure before the cast-in-place concrete is poured;

[0038] Figure 18 It is a schematic view of a finished product structure after the cast-in-place concrete is poured.

[0039] Wherein: 1. Prefabricated side beam, 101. Prefabricated side beam concrete, 102. Side beam key groove, 103. Side beam single-leg steel section, 104. Outer stiffening rib of side beam, 105. Inner connecting rib plate of side beam, 106. Side beam bolt hole, 107. Side beam stud, 108. Preset lower longitudinal reinforcement of side beam, 109. Preset waist reinforcement, 110. Open stirrup of side beam, 1101. Middle stirrup of side beam, 1102. Edge stirrup of side beam, 1103. Inner stirrup of side beam, 2. Prefabricated middle beam, 201. Prefabricated middle beam concrete, 202. Middle beam key groove, 203. Middle beam single-leg steel section, 204. Connecting rib plates on both sides of middle beam, 205. Middle beam bolt hole, 206. Middle beam stud, 207. Preset lower longitudinal reinforcement of middle beam, 208. Open stirrup of middle beam, 2081. Middle stirrup of middle beam, 2082. Side stirrup of middle beam, 3. Embedded angle steel, 4. Connecting vertical plate, 401. Vertical plate body, 402. Vertical plate bolt hole, 5. Stirrup cap, 6. Steel bottom formwork, 7. Prefabricated composite slab, 8. Bolt, 9. Post-set lower longitudinal reinforcement, 10. Post-set upper longitudinal reinforcement, 11. Reinforcement on upper part of slab, 12. Post-cast concrete. Detailed implementation mode

[0040] The technical solution of the present invention will be further described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other implementation manners obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope protected by the present invention.

[0041] The prefabricated assembled multi-leg steel-concrete beam of the present invention includes a group of prefabricated side beams 1 with symmetrical structures, and the structure of the prefabricated side beam 1 is as Figure 1-2 shown, including a side beam single-leg steel section 103, and a number of side beam open stirrups 110 are longitudinally arranged at intervals along the side beam single-leg steel section 103. The inner stirrup 110 of the side beam spans the side beam single-leg steel section 103 from bottom to top. A number of inner connecting rib plates 105 of the side beam are longitudinally arranged at intervals along the inner side of the side beam single-leg steel section 103 for connecting with the connecting structures of other corresponding prefabricated structural blocks (for example, connecting with the inner connecting rib plates 105 of the symmetrically arranged prefabricated side beams 1 or connecting with the connecting rib plates 204 on both sides of the prefabricated middle beam 2). The prefabricated side beam 1 is poured with prefabricated side beam concrete 101 from bottom to top and from the edge to the inside, pouring all of the side beam single-leg steel section 103 and part of the inner stirrup 110 of the side beam into the concrete. The top opening of the inner stirrup 110 of the side beam extends above the prefabricated side beam concrete 101, and at least part of the connection points of the inner connecting rib plate 105 of the side beam extend outside the prefabricated side beam concrete 101. An embedded angle steel 3 is also provided at the inner bottom of the prefabricated side beam concrete 101, and at least a part of the outer surface of the embedded angle steel 3 is exposed outside the prefabricated side beam concrete 101.

[0042] The precast side beams 1 with the above-mentioned symmetrical structure of the present invention can be butt-connected and combined with each other through the connecting rib plates 105 on the inner side of the side beams, as Figure 12 shown. Two symmetrical precast side beams 1 are directly connected to each other to form a precast beam structure that can be longitudinally spliced with each other. The structure assembly is convenient and has high flexibility and reliability.

[0043] Among them, at least one middle stirrup 1101 of the side beam of the side beam open stirrup 110 passes through the side beam single-leg steel section 103 from bottom to top; at least one side stirrup 1102 of the side beam of the side beam open stirrup 110 is located outside the side beam single-leg steel section 103; at least one inner stirrup 1103 of the side beam of the side beam open stirrup 110 is far from the inner side of the side beam single-leg steel section 103 and crosses the connection center of the connection structure between the precast side beam 1 and the corresponding precast structural block. After the precast structural blocks are connected to each other, the inner stirrup 1103 of the side beam can cross with the corresponding stirrup to improve the connection and stability relationship between the structures. For example, when two symmetrical precast side beams 1 are connected to each other, the corresponding two inner stirrups 1103 of the side beams cross each other. Preferably, after the precast structural blocks are connected to each other, the stirrups in the area between and on both sides of the connection structures can form a basically symmetrical distribution.

[0044] Among them, the inner surface of the precast side beam concrete 101 has side beam key grooves 102, and side beam stud bolts 107 are evenly distributed on the top of the side beam single-leg steel section 103. Both the side beam key grooves 102 and the side beam stud bolts 107 can increase the connection performance between the precast side beam 1 and the cast-in-place concrete 12.

[0045] Among them, side beam outer stiffening ribs 104 are longitudinally arranged at intervals on the outer side of the side beam single-leg steel section 103 to improve the bearing capacity and support strength of the side beam single-leg steel section 103; both the side beam outer stiffening ribs 104 and the side beam inner connecting rib plates 105 are fixedly connected between the upper and lower flanges of the side beam single-leg steel section 103, and welding connection can be adopted.

[0046] Among them, the side beam inner connecting rib plate 105 can be connected to the connection structure of other corresponding precast structural blocks through the connecting vertical plate 4 ( Figure 6 ); side beam bolt holes 106 are provided on the side beam inner connecting rib plate 105, which can be matched and connected with some bolt holes on the connecting vertical plate 4, and the other part of the bolt holes on the connecting vertical plate 4 can be matched and connected with the bolt holes on the connection structure of other corresponding precast structural blocks, so as to realize the connection function of the connecting vertical plate 4. Bolts 8 can be connected through the mutually matching bolt holes, and at the same time, the connecting vertical plate 4 can also play a role in strengthening the support of the connection part.

[0047] Among them, preset lower longitudinal steel bars 108 and preset waist steel bars 109 are also embedded in the precast side beam 1. The preset lower longitudinal steel bars 108 are longitudinally arranged on the bottom transverse steel bars of the side beam open stirrups 110 and are transversely spaced along the bottom transverse steel bars of the side beam open stirrups 110. At least a part of the preset lower longitudinal steel bars 108 of the side beam are respectively located at the intersections of the bottom horizontal and vertical steel bars of the side beam open stirrups 110. The preset waist steel bars 109 are longitudinally arranged at the outermost steel bars of the side beam open stirrups 110 and are vertically spaced along the outermost steel bars. The preset lower longitudinal steel bars 108 and the preset waist steel bars 109 of the side beam can form a steel bar mesh with the side beam open stirrups 110, improving the overall steel bar strength in the precast structural block.

[0048] Among them, the embedded angle steel 3( Figure 5 ) includes an angle steel 301 and angle steel steel bars 302 for connection. The embedded angle steel 3 in the precast side beam 1 is embedded in the precast side beam concrete 101 through the angle steel steel bars 302( Figure 7 ).

[0049] The precast assembled multi-limb steel reinforced concrete beam of the present invention further includes at least one precast middle beam 2 with its own symmetric structure. The structure of the precast middle beam 2 is as Figure 3-4 shown, including a single-limb steel section 203 of the middle beam. A number of middle beam open stirrups 208 are longitudinally spaced along the single-limb steel section 203 of the middle beam. The middle beam open stirrups 208 span over the single-limb steel section 203 of the middle beam from bottom to top. A number of middle beam connecting rib plates 204 are longitudinally spaced on both sides of the single-limb steel section 203 of the middle beam for connecting with the connection structures of other corresponding precast structural blocks (for example, symmetrically connecting with the inner beam connecting rib plates 105 of the precast side beam 1 on both sides). The precast middle beam 2 is poured with precast middle beam concrete 201 from the bottom upwards, pouring all of the single-limb steel section 203 of the middle beam and part of the middle beam open stirrups 208 into the concrete. The top openings of the middle beam open stirrups 208 extend above the precast middle beam concrete 201. At least some connection points of the middle beam connecting rib plates 204 extend outside the precast middle beam concrete 201. Embedded angle steel 3 is also provided at the bottoms on both sides of the precast middle beam concrete 201, and at least a part of the outer surface of the embedded angle steel 3 exposes outside the precast middle beam concrete 201.

[0050] One or more of the above-mentioned precast middle beams 2 of the present invention can be provided and connected between a group of symmetric precast side beams 1 to form a precast beam structure that can be longitudinally spliced with each other, and the number of precast middle beams 2 can be flexibly changed according to the working conditions to obtain a concrete beam with the required size. Figure 7-11 An exemplary structure form of connecting one precast middle beam 2 between a group of symmetric precast side beams 1 is shown. Figure 13An exemplary structure is shown in which two precast middle beams 2 are connected between a set of symmetric precast side beams 1. It can be seen that the number of precast middle beams 2 can be adjusted as needed and the structure can be extended. The precast structure of the present invention is longitudinally segmented and assembled. The precast structural blocks include precast side beams 1 and precast middle beams 2, which can maintain the longitudinal continuity of the beams and overcome the problem of the decrease in the longitudinal bearing capacity of the conventional transversely segmented beam structure.

[0051] Among them, at least one middle beam middle stirrup 2081 of the middle beam open stirrup 208 passes through the middle beam single-leg section steel 203 from bottom to top; on both sides of the middle beam open stirrup 208, at least one middle beam side stirrup 2082 is arranged away from both sides of the middle beam single-leg section steel 203 and crosses the connection center of the connection structure between the precast middle beam 2 and the corresponding precast structural block. After the precast structural blocks are connected to each other, the middle beam side stirrup 2082 can cross with the corresponding stirrup to improve the connection and stability relationship between the structures. For example, when the precast middle beam 2 is connected to a precast side beam 1, the corresponding middle beam side stirrup 2082 and the inner stirrup 1103 of the side beam are crossed with each other. Similarly, after the precast structural blocks are connected to each other, the stirrups within the connection structures and in the areas on both sides can form a substantially symmetric distribution.

[0052] Among them, middle beam key grooves 202 are provided on both side surfaces of the precast middle beam concrete 201, and middle beam stud bolts 206 are evenly distributed on the top of the middle beam single-leg section steel 203. Both the middle beam key grooves 202 and the middle beam stud bolts 206 can increase the connection performance between the precast middle beam 2 and the cast-in-place concrete 12.

[0053] Among them, the middle beam side connecting rib plates 204 are fixedly connected between the upper and lower flanges of the middle beam single-leg section steel 203, and welding connection can be adopted.

[0054] Among them, the middle beam side connecting rib plates 204 can be connected to the connection structures of other corresponding precast structural blocks through the connecting vertical plates 4; their functions and connection methods are basically the same as those of the inner connecting rib plates 105 of the side beams.

[0055] Among them, middle beam preset lower longitudinal bars 207 are also embedded in the precast middle beam 2. The middle beam preset lower longitudinal bars 207 are longitudinally arranged on the bottom transverse bars of the middle beam open stirrup 208 and are transversely spaced along the bottom transverse bars of the middle beam open stirrup 208. At least a part of the middle beam preset lower longitudinal bars 207 are respectively located at the intersections of the bottom horizontal and vertical bars of the middle beam open stirrup 208. The middle beam preset lower longitudinal bars 207 can form a steel bar mesh with the middle beam open stirrup 208 to improve the overall steel bar strength within the precast structural block.

[0056] Among them, the embedded angle steel 3 in the precast middle beam 2 is embedded in the precast middle beam concrete 201 through the angle steel bars 302.

[0057] The prefabricated and assembled multi-limb steel reinforced concrete beam of the present invention further includes a stirrup cap 5 for connecting the upper openings of the side beam open stirrups 110 and / or the middle beam open stirrups 208 in the prefabricated side beam 1 and / or the prefabricated middle beam 2 ( Figure 14 、 15 ). The stirrup cap 5 can be connected staggeredly as required above the prefabricated structural blocks with different lengths. Preferably, both ends of the stirrup cap 5 are respectively connected to the stirrup openings of two different prefabricated structural blocks.

[0058] The prefabricated and assembled multi-limb steel reinforced concrete beam of the present invention further includes a laterally provided upper longitudinal bar 10 at the upper openings of the side beam open stirrups 110 and / or the middle beam open stirrups 208, and a laterally provided lower longitudinal bar 9 below the connection structure between the prefabricated structural blocks ( Figure 14 、 15 ). The laterally provided lower longitudinal bar 9 is arranged at intervals along the bottom transverse bars of the side beam open stirrups 110 and / or the middle beam open stirrups 208. Both the laterally provided lower longitudinal bar 9 and the laterally provided upper longitudinal bar 10 are used to further form a steel bar mesh with the entire assembled structure to improve rigidity.

[0059] The prefabricated and assembled multi-limb steel reinforced concrete beam of the present invention further includes a steel bottom form 6 provided below the connection structure between the prefabricated structural blocks and welded and fixed at the bottom between adjacent embedded angle steels 3 ( Figure 15 、 16 ). The steel bottom form 6 is used to bear the post-cast concrete 12 between the prefabricated structural blocks.

[0060] The prefabricated and assembled multi-limb steel reinforced concrete beam of the present invention further includes prefabricated composite slabs 7 laid on the upper parts on both sides of the prefabricated side beam 1. The upper parts of the prefabricated composite slabs 7 are integrally laid with upper slab steel bars 11. The post-cast concrete 12 pours the interconnected prefabricated structural block structures (including the prefabricated side beam 1 and the prefabricated middle beam 2), the prefabricated composite slabs 7, and the upper slab steel bars 11 above into an integral structure ( Figure 17 、 18 ).

[0061] When the prefabricated and assembled multi-limb steel reinforced concrete beam of the present invention is manufactured and used, the prefabricated side beam 1 and the prefabricated middle beam 2 can be first manufactured in the factory and the embedded angle steels 3 are pre-embedded. At the same time, the commonly used connecting vertical plates 4, stirrup caps 5, steel bottom forms 6, prefabricated composite slabs 7 and bolts 8 are prepared on the project. The steel bars can be used as the laterally provided lower longitudinal bars 9, the laterally provided upper longitudinal bars 10, and the upper slab steel bars 11 according to the specifications.

[0062] First, erect the precast side beams 1 and precast middle beams 2 to the designated positions, connect the required number of precast structural blocks with the connecting vertical plates 4 and bolts 8, then lay the post-installed lower longitudinal reinforcement 9 and post-installed upper longitudinal reinforcement 10, and use the stirrup caps 5 to connect the upper openings of the side beam opening stirrups 110 and / or middle beam opening stirrups 208 in the precast side beams 1 and / or precast middle beams 2. At this time, all the steel bars in the beam form a skeleton; place the steel bottom form 6 flush with and welded to the embedded angle steel 3; lay the precast composite slabs 7 on the upper sides of both sides of the precast side beams 1, and the edges of the precast composite slabs 7 can be overlapped on the concrete edges of the precast side beams. Then lay the upper slab reinforcement 11, and finally complete the pouring of the post-cast concrete 12. Thus, the implementation of the precast assembled multi-limb steel reinforced concrete beam of the present invention is completed.

[0063] The protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily find changes or substitutions, which should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A prefabricated and assembled multi-limb steel reinforced concrete beam, comprising a group of precast side beams (1) with symmetric structures, and zero, one, or more precast middle beams (2). When the number of precast middle beams (2) is not zero, they are located in the middle of the symmetrically arranged precast side beams (1). The structure of the precast side beam (1) includes a single-limb steel section of the side beam (103), and a number of open stirrups of the side beam (110) are longitudinally spaced along the single-limb steel section of the side beam (103). The inner stirrup of the side beam (1103) spans the single-limb steel section of the side beam (103) from bottom to top. A number of inner connecting rib plates of the side beam (105) are longitudinally spaced along the inner side of the single-limb steel section of the side beam (103) for connecting with the connecting structures of other corresponding precast structural blocks. The precast side beam (1) is cast with precast side beam concrete (101) from bottom to top and from the edge inward, pouring all of the single-limb steel section of the side beam (103) and part of the inner stirrup of the side beam (1103) into the concrete. The top opening of the inner stirrup of the side beam (1103) extends above the precast side beam concrete (101), and at least part of the connection points of the inner connecting rib plates of the side beam (105) extend outside the precast side beam concrete (101). An embedded angle steel (3) is also provided at the inner bottom of the precast side beam concrete (101), and at least part of the outer surface of the embedded angle steel (3) is exposed outside the precast side beam concrete (101). The structure of the precast middle beam (2) includes a single-limb steel section of the middle beam (203), and a number of open stirrups of the middle beam (208) are longitudinally spaced along the single-limb steel section of the middle beam (203). The open stirrups of the middle beam (208) span the single-limb steel section of the middle beam (203) from bottom to top. A number of connecting rib plates on both sides of the middle beam (204) are longitudinally spaced along both sides of the single-limb steel section of the middle beam (203) for connecting with the connecting structures of other corresponding precast structural blocks. The precast middle beam (2) is cast with precast middle beam concrete (201) from bottom to top, pouring all of the single-limb steel section of the middle beam (203) and part of the open stirrups of the middle beam (208) into the concrete. The top opening of the open stirrups of the middle beam (208) extends above the precast middle beam concrete (201), and at least part of the connection points of the connecting rib plates on both sides of the middle beam (204) extend outside the precast middle beam concrete (201). Embedded angle steels (3) are also provided at the bottoms on both sides of the precast middle beam concrete (201), and at least part of the outer surface of the embedded angle steels (3) is exposed outside the precast middle beam concrete (201). At least one middle stirrup of the side beam (1101) of the open stirrup of the side beam (110) passes through the single-limb steel section of the side beam (103) from bottom to top; at least one edge stirrup of the side beam (1102) of the open stirrup of the side beam (110) is located outside the single-limb steel section of the side beam (103); at least one inner stirrup of the side beam (1103) of the open stirrup of the side beam (110) is away from the inner side of the single-limb steel section of the side beam (103) and crosses the connection center of the connection structure between the precast side beam (1) and the corresponding precast structural block. At least one middle beam middle stirrup (2081) of the middle beam open stirrup (208) passes through the middle beam single-leg steel section (203) from bottom to top; on both sides of the middle beam open stirrup (208), there are at least one middle beam side stirrup (2082) respectively, which are far away from both sides of the middle beam single-leg steel section (203) and cross the connection center of the connection structure between the precast middle beam (2) and the corresponding precast structural block. After the precast structural blocks are connected to each other, the stirrups within the area between and on both sides of the connection structures can form a substantially symmetric distribution. On the outside of the side beam single-leg steel section (103), side beam outer stiffening ribs (104) are longitudinally arranged at intervals; both the side beam outer stiffening ribs (104) and the side beam inner connection rib plates (105) are fixedly connected between the upper and lower flanges of the side beam single-leg steel section (103); the middle beam two-side connection rib plates (204) are fixedly connected between the upper and lower flanges of the middle beam single-leg steel section (203).

2. The prefabricated and assembled multi-limb steel reinforced concrete beam according to claim 1, wherein On the inner surface of the precast side beam concrete (101), there are side beam key grooves (102), and side beam stud bolts (107) are evenly distributed on the top of the side beam single-leg steel section (103); on both side surfaces of the precast middle beam concrete (201), there are middle beam key grooves (202), and middle beam stud bolts (206) are evenly distributed on the top of the middle beam single-leg steel section (203).

3. The prefabricated and assembled multi-limb steel reinforced concrete beam according to claim 1, wherein A connecting vertical plate (4) is provided between the precast structural blocks, and the corresponding connection rib plates between adjacent precast structural blocks are bolted and fixedly connected through the connecting vertical plate (4); the embedded angle steels (3) in the precast structural blocks are embedded in the precast side beam concrete (101) or the precast middle beam concrete (201) through angle steel bars (302).

4. The prefabricated and assembled multi-limb steel reinforced concrete beam according to claim 1, wherein In the precast side beam (1), there are also precast side beam lower longitudinal bars (108) and preset waist bars (109) embedded. The precast side beam lower longitudinal bars (108) are longitudinally arranged on the bottom transverse bars of the side beam open stirrup (110) and are transversely arranged at intervals along the bottom transverse bars of the side beam open stirrup (110). At least a part of the precast side beam lower longitudinal bars (108) are respectively located at the intersections of the bottom horizontal and vertical bars of the side beam open stirrup (110). The preset waist bars (109) are longitudinally arranged at the outermost bars of the side beam open stirrup (110) and are vertically arranged at intervals along the outermost bars. In the precast middle beam (2), there are also precast middle beam lower longitudinal bars (207) embedded. The precast middle beam lower longitudinal bars (207) are longitudinally arranged on the bottom transverse bars of the middle beam open stirrup (208) and are transversely arranged at intervals along the bottom transverse bars of the middle beam open stirrup (208). At least a part of the precast middle beam lower longitudinal bars (207) are respectively located at the intersections of the bottom horizontal and vertical bars of the middle beam open stirrup (208).

5. The prefabricated and assembled multi-limb steel reinforced concrete beam according to claim 1, characterized in that, It also includes a stirrup cap (5) for connecting the upper openings of the open stirrups in the precast structural blocks. The stirrup caps (5) are staggered and connected above the precast structural blocks with different lengths, and both ends of the stirrup cap (5) are respectively connected to the stirrup openings of two different precast structural blocks.

6. The prefabricated and assembled multi-limb steel reinforced concrete beam according to claim 1, wherein, It further includes a post - installed upper longitudinal reinforcement (10) longitudinally arranged at the upper openings of the side - beam open stirrups (110) and / or the middle - beam open stirrups (208), and a post - installed lower longitudinal reinforcement (9) longitudinally arranged below the connection structure between precast structural blocks. The post - installed lower longitudinal reinforcement (9) is arranged at intervals along the bottom transverse reinforcement of the side - beam open stirrups (110) and / or the middle - beam open stirrups (208).

7. The prefabricated and assembled multi-limb steel reinforced concrete beam according to claim 1, wherein It further includes a steel bottom formwork (6) arranged below the connection structure between precast structural blocks and welded and fixed at the bottom between adjacent embedded angle steels (3).

8. The prefabricated and assembled multi-limb steel reinforced concrete beam according to claim 1, characterized in that, It further includes precast composite slabs (7) laid on the upper parts of both sides of the precast side - beam (1). The upper part of the precast composite slab (7) is integrally laid with upper - slab steel bars (11). The post - cast concrete (12) pours the interconnected precast structural block structure, the precast composite slab (7), and the upper - slab steel bars (11) above into an integral structure.

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