Prefabricated steel pipe concrete column steel beam connecting joint and construction method

Abstract

This invention discloses a precast steel-concrete composite column-beam connection node and construction method. The connection node includes: a first precast steel-concrete composite column; a second precast steel-concrete composite column; a connection node unit composed of an inner steel pipe, an outer steel pipe, a through-connecting plate, and two third flange plates. The inner steel pipe extends beyond the outer steel pipe at both ends to form a first post-cast anchorage section and a second post-cast anchorage section, respectively. The through-connecting plate passes through the outer steel pipe from at least one side and is welded to the inner steel pipe. The third flange plates are welded to both ends of the outer steel pipe. The first and second precast steel-concrete composite columns are connected to one of the two third flange plates via bolts through the first and second flange plates, respectively; a post-grouting layer; and a steel beam bolted to the connection node unit. This invention enables rapid, fully bolted connection between the precast steel-concrete composite column and the steel beam at the node, reducing the impact of installation errors, improving on-site assembly speed and connection quality, and ensuring the load-bearing performance of the node.

Description

Technical Field

[0001] This invention relates to the field of structural engineering technology, particularly to prefabricated assembled building structures, and specifically to a prefabricated steel tube concrete column-beam connection node and construction method. Background Technology

[0002] In the process of realizing the prefabrication and industrialization of steel-concrete composite structures, the vertical connection between prefabricated steel-concrete composite columns and the horizontal connection between prefabricated steel-concrete composite columns and H-beams are key technical issues.

[0003] The construction of existing steel-concrete composite frame structures mostly adopts the method of on-site welding connection between steel pipe columns and on-site pouring of concrete inside the pipes. Based on this construction process, the main problems are: First, the quality of on-site welding is not easy to control and has large dispersion, which brings safety hazards to the actual stress performance of the components; Second, the component connection is complex and not conducive to the vibration and compaction of the cast-in-place concrete, making it difficult to control the quality of on-site pouring and hindering the realization of civilized and green construction.

[0004] In addition, existing prefabricated node connection technologies are difficult to control at the node installation error, which often affects the on-site assembly speed and connection quality, thereby affecting construction efficiency and the stress performance of the node. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this invention provides a precast steel-concrete composite column-beam connection node and construction method, which enables rapid bolted connection between the precast steel-concrete composite column and the steel beam at the node. By introducing micro-pressure grouting treatment in the connection area, the impact of installation errors is reduced, the on-site assembly speed and connection quality are improved, and the stress performance of the node is guaranteed, which is in line with the development direction of green building and prefabricated building.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] This invention first provides a precast steel-concrete composite column-beam connection node, comprising:

[0010] The first precast steel-concrete composite column has a first hollow section in the connection area, and the first precast steel-concrete composite column has a first flange plate at the connection end;

[0011] The second precast steel-concrete composite column has a second hollow section in the connection area, and the second precast steel-concrete composite column has a second flange plate at the connection end;

[0012] A connecting node unit is established between the first precast steel-concrete composite column and the second precast steel-concrete composite column. The connecting node unit consists of an inner steel pipe, an outer steel pipe, a through-connecting plate, and two third flange plates. The inner steel pipe is fitted inside the outer steel pipe, with both ends extending beyond the outer steel pipe to form a first post-cast anchorage section and a second post-cast anchorage section, respectively. The through-connecting plate passes through the outer steel pipe from at least one side and is welded to the inner steel pipe. The third flange plates are welded to both ends of the outer steel pipe and simultaneously welded to the through-connecting plate. The first and second precast steel-concrete composite columns are connected by bolts to one of the two third flange plates via the first and second flange plates, respectively. The first post-cast anchorage section is inserted into the first hollow section, and the second post-cast anchorage section is inserted into the second hollow section.

[0013] The post-grouting layer is formed by post-cast concrete poured into the first hollow section, the second hollow section, and the connecting node unit;

[0014] The steel beam is bolted to the connecting node unit.

[0015] In some embodiments, the first flange plate is welded and fixed to the bottom of the connecting end of the first precast steel pipe concrete column, and the second flange plate is welded and fixed to the top of the connecting end of the second precast steel pipe concrete column, and the flange through hole is consistent with the inner cavity of the precast steel pipe concrete column.

[0016] In some embodiments, the first precast steel-concrete composite column is welded with a plurality of first annular reinforcing bars in the first hollow section, the second precast steel-concrete composite column is welded with a plurality of second annular reinforcing bars in the second hollow section, and the inner steel pipe is welded with a plurality of third annular reinforcing bars outside the first and second post-cast anchorage sections, and the first annular reinforcing bars correspond to the positions of the second annular reinforcing bars and are staggered relative to the third annular reinforcing bars.

[0017] In some embodiments, the lengths of the first post-cast anchorage section and the second post-cast anchorage section are the same as the lengths of the first hollow section and the second hollow section.

[0018] The cross-sectional dimensions of the first post-cast anchorage section and the second post-cast anchorage section are slightly smaller than the cross-sectional dimensions of the first hollow section and the second hollow section.

[0019] In some embodiments, the cross-sectional dimensions of the outer steel tube are the same as those of the first precast steel tube concrete column and the second precast steel tube concrete column;

[0020] The outer steel pipe is welded to the edge of the flange through hole of the third flange plate, and a flow gap is formed between the outer steel pipe and the inner steel pipe.

[0021] In some embodiments, the first precast steel-concrete composite column is provided with an overflow hole in its first hollow section, and the second precast steel-concrete composite column is provided with an injection hole in its second hollow section. The post-cast concrete is injected into the second hollow section through the injection hole and fills the flow gap and the first hollow section through the flow gap.

[0022] In some embodiments, the third flange plate extends outward on at least one side of the connecting node unit to form an extension section, at least one of the through connecting plates is welded between the extension sections of the upper and lower third flange plates, and the extension section and the through connecting plate are provided with bolt holes for bolting to the steel beam.

[0023] In some embodiments, the third flange plate extends outward on both sides of the connecting node unit to form an extension section, constituting a straight flange plate for connecting the left and right steel beams; or

[0024] The third flange plate extends outward around the connection node unit to form an extension section, constituting a cross-shaped flange plate for connecting the four steel beams.

[0025] The present invention further provides a construction method for the connection node, comprising:

[0026] The factory manufactures the first precast steel-concrete composite column, the second precast steel-concrete composite column, and the connecting node units;

[0027] The second precast steel pipe concrete column is fixed on site, the connecting node unit is hoisted onto the second precast steel pipe concrete column, the third flange plate is aligned with the second flange plate and fixed with bolts;

[0028] The first precast steel pipe concrete column is hoisted onto the connection node unit, and the first flange plate and the third flange plate are aligned and fixed with bolts.

[0029] The steel beam is hoisted to a fixed position and horizontally aligned with the third flange plate of the connecting node unit. The steel beam is then bolted to the third flange plate of the connecting node unit and the through connecting plate.

[0030] After all components are assembled, grout is injected into the second hollow section through the grouting holes on the second precast steel pipe concrete column. The grout fills the second hollow section and flows through the flow gap between the inner and outer steel pipes to the first hollow section of the first precast steel pipe concrete column.

[0031] The grout discharge from the overflow hole on the first precast steel pipe concrete column is determined to confirm whether the grouting at the connection node is dense.

[0032] In some embodiments, the factory fabrication of the first precast steel-concrete composite column, the second precast steel-concrete composite column, and the connecting node unit specifically involves:

[0033] A first hollow section is reserved at the bottom of the first precast steel pipe concrete column, an overflow hole is set on the first hollow section, multiple ring steel bars are welded to the inner wall of the first hollow section, a first flange plate is welded to the bottom of the first precast steel pipe concrete column, and finally concrete is poured.

[0034] A second hollow section is reserved at the top of the second precast steel pipe concrete column. A grouting hole is set on the second hollow section. Multiple ring-shaped steel bars are welded to the inner wall of the second hollow section. A second flange plate is welded to the top of the second precast steel pipe concrete column. Finally, concrete is poured.

[0035] Assemble and weld the inner steel pipe, outer steel pipe, through connecting plate and third flange plate. The two ends of the inner steel pipe extend out of the outer steel pipe. Weld multiple ring-shaped steel bars on the outer wall of the extended section. Pour concrete inside the inner steel pipe.

[0036] (III) Beneficial Effects

[0037] This invention provides a precast steel-concrete composite column-beam connection node and construction method, enabling rapid bolted connection between the precast steel-concrete composite column and the steel beam at the node. By introducing micro-pressure grouting in the connection area, the impact of installation errors is reduced, improving on-site assembly speed and connection quality, ensuring the stress performance of the node, and conforming to the development direction of green building and prefabricated building. Specifically, it can achieve at least one or more of the following effective effects:

[0038] (1) The flange plates of the precast steel pipe concrete upper column and the precast steel pipe concrete lower column are welded and fixed to the flange plates of the connecting node unit by bolts. At the same time, hollow sections with the same as the inner steel pipe anchorage section are reserved at the lower end of the precast steel pipe concrete upper column and the upper end of the precast steel pipe concrete lower column. The hollow sections are then grouted and anchored. The combination of flange bolt connection and post-grouting anchorage improves the connection strength and integrity of the connecting node.

[0039] (2) The inner steel pipe and the outer steel pipe are connected and fixed by a through connecting plate. The through connecting plate passes through the outer steel pipe and is welded and fixed to the inner steel pipe at the inner end. In addition to connecting the inner and outer steel pipes, it also forms a flow gap between the inner and outer steel pipes, providing a grouting channel for the grout to completely fill the hollow section of the upper and lower columns during the later grouting. Furthermore, the grout completely fills the space between the inner and outer steel pipes, which can further enhance the strength of the connection node unit itself.

[0040] (3) The upper and lower flange plates of the connecting node unit are combined with the through connecting plate. While serving as the steel frame of the connecting node unit, it also facilitates the bolt connection and fixing of the subsequent steel beams without the need to open bolt holes or weld connections.

[0041] (4) The upper and lower flange plates of the connecting node unit can be designed to extend to one or more sides according to the actual engineering needs, forming a straight flange plate or a cross flange plate, so as to facilitate the connection of one or more steel beams and meet the connection needs of different projects.

[0042] It should be understood that the description in the Summary of the Invention is not intended to limit the key or essential features of the embodiments of the present invention, nor is it intended to restrict the scope of the invention. Other features of the invention will become readily apparent from the following description.

[0043] It should also be understood that the implementation of any embodiment of the present invention does not mean that it will simultaneously possess or achieve multiple or all of the above-mentioned beneficial effects. Attached Figure Description

[0044] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0045] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0046] Figure 1 This is an exploded view of the overall structure of one embodiment of the present invention;

[0047] Figure 2 This is a schematic diagram of the upper and lower column structure according to an embodiment of the present invention, wherein (a) is the upper column and (b) is the lower column;

[0048] Figure 3 This is a schematic diagram of the structure of a connection node unit according to an embodiment of the present invention;

[0049] Figure 4 This is a schematic diagram of the connection node unit and the upper and lower columns of the cut-off portion according to an embodiment of the present invention;

[0050] Figure 5 This is a schematic diagram of the structure of a connection node unit after grouting according to an embodiment of the present invention;

[0051] Figure 6This is a top view of a connection node unit according to an embodiment of the present invention;

[0052] Figure 7 This is a schematic diagram of an H-shaped steel beam and connecting plate structure according to an embodiment of the present invention;

[0053] Figure 8 This is a schematic diagram of the connection state structure according to an embodiment of the present invention.

[0054] The meanings represented by the numbers in the diagram are as follows:

[0055] 1-First precast steel-concrete composite column, 11-First hollow section, 12-First flange plate, 13-First ring reinforcement, 14-Grouting hole, 2-Second precast steel-concrete composite column, 21-Second hollow section, 22-Second flange plate, 23-Second ring reinforcement, 24-Grouting hole, 3-Connecting node unit, 31-Inner steel pipe, 32-Outer steel pipe, 33-Through connecting plate, 34-Third flange plate, 341-Extension section, 35-Concrete, 36-Third ring reinforcement, 37-Flow gap, 4-Post-grouting layer, 5-Steel beam, 6-First horizontal connecting plate, 7-Second horizontal connecting plate, 8-Vertical connecting plate.

[0056] In the various figures, the same or corresponding reference numerals indicate the same or corresponding parts. Detailed Implementation

[0057] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Here, the illustrative embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0058] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0059] It should be understood that the terms "comprising / including," "consisting of," or any other variations are intended to cover non-exclusive inclusion, such that a product, apparatus, process, or method that comprises a list of elements includes not only those elements but may also include, where necessary, other elements not expressly listed, or elements inherent to such a product, apparatus, process, or method. Without further limitation, an element defined by the phrases "comprising / including," "consisting of," does not exclude the presence of additional identical elements in the product, apparatus, process, or method that includes said element.

[0060] It should also be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device, component or structure referred to must have a specific orientation, be constructed or operated in a specific orientation, and should not be construed as a limitation of the present invention.

[0061] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0062] The construction of existing steel-concrete composite frame structures mostly adopts the method of on-site welding connection between steel pipe columns and on-site pouring of concrete inside the pipes. On-site welding quality is not easy to control and has large dispersion, which brings safety hazards to the actual stress performance of the components; the component connection is complex and not conducive to the vibration and compaction of cast-in-place concrete, making it difficult to control the on-site pouring quality and hindering the realization of civilized and green construction; installation errors at the joints are difficult to control, affecting construction efficiency and the stress performance of the joints.

[0063] Based on this, the present invention provides a precast steel-concrete composite column-beam connection node and construction method, which can realize the full bolted rapid connection between the precast steel-concrete composite column and the steel beam at the node. By introducing micro-pressure grouting treatment in the connection area, the impact of installation error is reduced, the on-site assembly speed and connection quality are improved, the stress performance of the node is guaranteed, and it is in line with the development direction of green building and prefabricated building.

[0064] To better understand the above technical solution, the following will provide a detailed explanation of the technical solution in conjunction with the accompanying drawings and specific implementation methods.

[0065] See Figures 1 to 5A precast steel-concrete composite column-beam connection node mainly includes: a first precast steel-concrete composite column 1, a second precast steel-concrete composite column 2, a connection node unit 3, a post-grouting layer 4, and a steel beam 5. The first precast steel-concrete composite column 1 and the second precast steel-concrete composite column 2 are vertically connected and fixed with bolts through the connection node unit 3. The steel beam 5 is also fixed to the connection node unit 3 with bolts. By pouring the post-grouting layer 4 into the gap of the node, the precast steel-concrete composite column can be quickly assembled vertically, and the steel beam and the precast steel-concrete composite column can be quickly assembled horizontally, thereby improving the on-site assembly speed and connection quality and ensuring the stress performance of the node.

[0066] See Figure 2 (a) shows a first precast steel-concrete composite column 1, and (b) shows a second precast steel-concrete composite column 2. In this embodiment, the first precast steel-concrete composite column 1 is an upper precast steel-concrete composite column, and the second precast steel-concrete composite column 2 is a lower precast steel-concrete composite column. The first precast steel-concrete composite column 1 has a first hollow section 11 in its lower connecting area and a first flange plate 12 at its bottom end. The second precast steel-concrete composite column 2 has a second hollow section 21 in its upper connecting area and a second flange plate 22 at its top end.

[0067] As is easy to understand, the so-called connection area is the part of the precast steel-concrete composite column used for connection, and the outside of the connection area is the column body.

[0068] The so-called first hollow section 11 and second hollow section 21 are concave structures reserved inside the column, which can also be called cavity structures or hollow structures. Concrete is not pre-poured into the steel pipe in this section. For example, a wooden plug is placed in the steel pipe during factory prefabrication so that this section is left empty when pre-pouring the concrete inside the pipe. Concrete is pre-poured into the steel pipe outside this section to form a precast steel pipe concrete column.

[0069] See Figures 3 to 5The diagram illustrates a connection node unit 3, comprising an inner steel pipe 31, an outer steel pipe 32, a through-connecting plate 33, and two third flange plates 34. The inner steel pipe 31 is fitted inside the outer steel pipe 32, with the inner steel pipe 31 being longer than the outer steel pipe 32, causing both ends of the inner steel pipe 31 to extend beyond the outer steel pipe 32. These extended sections form a first post-cast anchorage section and a second post-cast anchorage section, corresponding to the first hollow section 11 and the second hollow section 21, respectively. Preferably, the lengths of the extended sections at both ends are equal to facilitate standardized processing and balanced stress distribution. Concrete 35 is pre-cast inside the inner steel pipe 31 to form an inner steel pipe concrete. After the upper column (the first precast steel pipe concrete column 1) is installed and before the post-grouting layer 4 is poured, the stress at the connection node is mainly borne by the inner steel pipe 31 and the concrete 35 inside, preventing buckling caused by temporary excessive stress on the outer steel pipe 32.

[0070] The through-connecting plate 33 passes through the outer steel pipe 32 from at least one side and is welded to the inner steel pipe 31, such as... Figure 3 The through-connecting plate 33 shown passes through the outer steel pipe 32 from both the left and right sides. However, this is obviously just an illustration and not a unique limitation of the present invention. Depending on the actual engineering needs, the through-connecting plate 33 can be flexibly designed to be used on one or more sides.

[0071] Two third flange plates 34 are welded to both ends of the outer steel pipe 32 from the top and bottom, respectively, and are simultaneously welded to the through connecting plate 33. Since the through connecting plate 33 passes through the outer steel pipe 32 and is welded to the inner steel pipe 31, the inner steel pipe 31, outer steel pipe 32, through connecting plate 33, and two third flange plates 34 form a stable overall frame. Vertically, the first precast steel pipe concrete column 1 and the second precast steel pipe concrete column 2 are connected to one of the upper and lower third flange plates 34 by bolts via the first flange plate 12 and the second flange plate 22, respectively. In the connected state, the first post-cast anchorage section and the second post-cast anchorage section extending from both ends of the inner steel pipe 31 are respectively inserted into the first hollow section 11 and the second hollow section 21. Figure 4 As shown.

[0072] After connection, during on-site construction, concrete is poured into the first hollow section 11, the second hollow section 21, and the connecting node unit 3 to form the post-grouting layer 4, such as... Figure 5As shown. Currently, a common problem in prefabricated construction is insufficient installation accuracy. In this invention, when the first precast steel-concrete composite column 1 and the second precast steel-concrete composite column 2 are connected, as long as the connecting node unit 3 is accurately aligned, minor defects in the concrete of the internal precast steel-concrete composite column, or slight tilting of the inner steel pipe 31, can be compensated for by post-grouting to compensate for the impact of installation errors on the load-bearing performance, thus achieving a firm connection and fixation between the upper and lower precast steel-concrete composite columns. The introduction of micro-pressure grouting during post-cast concrete pouring emphasizes pressure grouting to improve grouting quality, and emphasizes micro-pressure grouting to minimize the circumferential thickness of the post-grouting layer, thereby reducing on-site wet work.

[0073] For details, please refer to [link / reference]. Figure 2 The first flange plate 12 is welded and fixed to the bottom of the connection end of the first precast steel pipe concrete column 1, and the second flange plate 22 is welded and fixed to the top of the connection end of the second precast steel pipe concrete column 2. This facilitates the tight connection between the two precast steel pipe concrete columns and the third flange plate 34 of the connection node unit 3. Furthermore, the flange through hole is consistent with the inner cavity of the two precast steel pipe concrete columns, that is, the same size, which facilitates the insertion of the two post-cast anchoring sections extending from both ends of the inner steel pipe 31 of the connection node unit 3.

[0074] In some embodiments, see Figures 2 to 4 The first precast steel-concrete composite column 1 has multiple first annular reinforcing bars 13 welded inside the first hollow section 11, and the second precast steel-concrete composite column 2 has multiple second annular reinforcing bars 23 welded inside the second hollow section 21. Furthermore, the inner steel pipe 31 has multiple third annular reinforcing bars 36 welded to the outside of both the first and second post-cast anchorage sections. The first annular reinforcing bars 13 and second annular reinforcing bars 23 are welded to the inner walls of the steel pipes in the first and second hollow sections 11 and 21, respectively. The third annular reinforcing bars 36 are welded to the outer walls of the protruding sections of the inner steel pipe 31. The annular shape of the reinforcing bars corresponds to the cross-sectional shape of the precast steel-concrete composite column's steel pipe; for circular steel pipe columns, it is a circular ring, and for square steel pipe columns, it is a square ring. The number of rings is determined based on the lengths of the first hollow section 11, the second hollow section 21, the first post-cast anchorage section, and the second post-cast anchorage section. For example, in this embodiment, the length is 500 mm, and each annular reinforcing bar is configured with two rings.

[0075] More specifically, the first ring-shaped reinforcing bar 13 corresponds to the second ring-shaped reinforcing bar 23, and is staggered relative to the third ring-shaped reinforcing bar 36, meaning that they are intersecting after assembly. Figure 4 As shown. With the help of the ring reinforcement, after the first hollow section 11 and the second hollow section 21 are inserted into the first post-cast anchorage section and the second post-cast anchorage section respectively, and concrete is poured afterward, the anchorage force between the first precast steel pipe concrete column 1, the second precast steel pipe concrete column 2 and the connecting node unit 3 is enhanced, and the shear strength at the node is enhanced.

[0076] In some embodiments, the cross-sectional dimensions of the first post-cast anchoring section and the second post-cast anchoring section are smaller than the cross-sectional dimensions of the first hollow section 11 and the second hollow section 21, so as to facilitate the insertion of the first hollow section 11 and the second hollow section 21, while reserving sufficient internal voids for the formation of the post-grouting layer 4. However, it should be noted that the internal gap does not need to be too large, that is, to ensure that the circumferential thickness of the post-grouting layer 4 is as small as possible, so as to minimize on-site wet work. Therefore, the cross-sectional dimensions of the first and second post-cast anchor sections are slightly smaller than the cross-sectional dimensions of the first hollow section 11 and the second hollow section 21. Considering that welding 10mm diameter ring steel bars on the first and second post-cast anchor sections and inside the first and second hollow sections 11 and 21 can meet the shear resistance requirements, adding 10mm to the diameter of the ring steel bars as an internal gap can meet the requirements of the post-cast grouting layer 4. Therefore, in this invention, the inner radius of the outer steel pipe 32 is preferably about 30mm different from the outer radius of the inner steel pipe 31. For example, the inner radius of the outer steel pipe 32 is 30-40mm larger than the outer radius of the inner steel pipe 31.

[0077] In some embodiments, the lengths of the first post-cast anchorage section and the second post-cast anchorage section are the same as the lengths of the first hollow section 11 and the second hollow section 21, so that after the insertion, the first precast steel pipe concrete column 1, the second precast steel pipe concrete column 2 and the connection node unit 3 are exactly fully connected, and a stable and reliable connection is formed after the concrete is poured.

[0078] In some embodiments, see continue to see Figures 3 to 6 The cross-sectional dimensions of the outer steel pipe 32 are the same as those of the first precast steel-concrete column 1 and the second precast steel-concrete column 2. The outer steel pipe 32 is welded to the inner edge of the third flange plate 34, i.e., the edge of the flange through hole of the third flange plate 34, forming a flow gap 37 between it and the inner steel pipe 31. The post-grouting layer 4 is poured into the first hollow section 11, the second hollow section 21, and the flow gap 37, i.e., the post-poured concrete fills the first hollow section 11, the second hollow section 21, and the gap between the inner steel pipe 31 and the outer steel pipe 32. Figure 5 As shown (the concrete between the inner steel pipe 31 and the outer steel pipe 32 is not shown), this is to ensure the strength of the connection node unit 3 itself and the connection strength with the first precast steel pipe concrete column 1 and the second precast steel pipe concrete column 2.

[0079] In some embodiments, see continue to see Figure 2 , Figure 4 , Figure 5The second precast steel-concrete composite column 2 has a grouting hole 24 in its second hollow section, and the first precast steel-concrete composite column 1 has an overflow hole 14 in its first hollow section 11. The post-cast concrete is injected into the second hollow section 21 through the grouting hole 24 and fills the flow gap 37 between the inner steel pipe 31 and the outer steel pipe 32. Then it fills the first hollow section 11 through the flow gap 37 until it is full and overflows from the overflow hole 14.

[0080] In this invention, see also Figures 3 to 6 The third flange plate 34 extends outward from at least one side of the connecting node unit 3 to form an extension section 341. At least one through-connecting plate 33 is welded between the extension sections 341 of the upper and lower third flange plates 34, and bolt holes are provided on the extension sections 341 and the through-connecting plates 33 for bolting to the steel beams 5. Specifically, the third flange plate 34 extends outward from opposite sides of the connecting node unit 3 to form extension sections 341, constituting a straight flange plate for connecting the left and right steel beams 5. Of course, according to actual needs, the third flange plate 34 extends outward from all four sides of the connecting node unit 3 to form extension sections 341, constituting a cross-shaped flange plate for connecting four steel beams 5.

[0081] In some embodiments, see continue to see Figure 1 and Figure 7 The steel beam 5 is an H-shaped steel beam with bolt holes on its upper and lower flange plates and web. The upper and lower flange plates of the H-shaped steel beam are bolted to the extensions 341 of the upper and lower third flange plates 34 through the first horizontal connecting plate 6 and the second horizontal connecting plate 7. The web of the H-shaped steel beam is bolted to the through connecting plate 33 through the vertical connecting plate 8. In this way, the steel beam 5 is connected and fixed to the precast steel pipe concrete column in the lateral direction.

[0082] Preferably, the first horizontal connecting plate 6 comprises three pieces, one of which is bolted to the upper surface of the upper flange plate, and the other two are bolted to the lower surfaces of the upper flange plates on both sides of the web plate, and both are bolted to the extension 341 of the third flange plate 34. The second horizontal connecting plate 7 adopts the same structure. The vertical connecting plate 8 comprises two pieces, which are bolted to the left and right sides of the web plate, and both are bolted to the through connecting plate 33. This achieves better connection strength and stability.

[0083] In this invention, the first precast steel-concrete composite column 1 and the second precast steel-concrete composite column 2 can be square columns or circular columns, and the corresponding first flange plate 12 and second flange plate 22 can be square flange plates or circular flange plates.

[0084] The construction method of the connection node of the present invention is as follows:

[0085] First, the factory manufactures the first precast steel-concrete composite column 1, the second precast steel-concrete composite column 2, and the connecting node unit 3.

[0086] Specifically, a first hollow section 11 is reserved at the lower part of the first precast steel-concrete composite column 1. An overflow hole 14 is set on the first hollow section 11. Multiple ring-shaped reinforcing bars 13 are welded to the inner wall of the first hollow section 11. A first flange plate 12 is welded to the bottom of the first precast steel-concrete composite column 1. Finally, concrete is poured. The length of the first hollow section 11 is not too long and can be formed by pre-embedded wooden plugs. The ring-shaped reinforcing bars 13 can be welded by spot welding. The construction process is operable.

[0087] Similarly, a second hollow section 21 is reserved at the upper part of the second precast steel pipe concrete column 2, a grouting hole 24 is set on the second hollow section 21, multiple ring steel bars 23 are welded to the inner wall of the second hollow section 21, a second flange plate 22 is welded to the top of the second precast steel pipe concrete column 2, and finally concrete is poured.

[0088] The fabrication of the connecting node unit 3 specifically involves assembling and welding the inner steel pipe 31, the outer steel pipe 32, the through connecting plate 33, and the third flange plate 34. The inner steel pipe 31 extends out of the outer steel pipe 32 at both ends, and multiple ring-shaped steel bars 36 are welded to the outer wall of the extended section. Concrete 35 is poured inside the inner steel pipe 31.

[0089] Specifically, the inner steel pipe 31, outer steel pipe 32, through-connecting plate 33, and third flange plate 34 can all be made by cutting steel plates. First, steel plates of the specified dimensions are cut according to design requirements, and strip grooves are cut into some of the steel plates and welded to form the inner steel pipe 31. Then, the through-connecting plate 33 is inserted into the strip groove of one of the steel plates and welded at the groove joint. The inner end of the through-connecting plate 33 is welded to the inner steel pipe 31 for fixation. Then, three other steel plates are welded around the inner steel pipe 31 to form the outer steel pipe 32. The third flange plate 34 is then installed on the upper and lower parts of the through-connecting plate 33 and welded for fixation. Finally, ring-shaped reinforcing bars are welded to the upper and lower protruding sections of the inner steel pipe 31. After the steel frame is fabricated, concrete is poured inside the inner steel pipe 31, and the connection node unit 3 is completed.

[0090] After all components are manufactured, they are transported to the construction site. During on-site assembly, the second precast steel pipe concrete column 2 (lower column) is first fixed, the connecting node unit 3 is hoisted onto the second precast steel pipe concrete column 2, and the third flange plate 34 is aligned with the second flange plate 22 and fixed with bolts.

[0091] Then, the first precast steel pipe concrete column 1 is hoisted onto the connection node unit 3, and the first flange plate 12 and the third flange plate 34 are aligned and fixed with bolts.

[0092] The steel beam 5 is then hoisted to a fixed position and horizontally aligned with the third flange plate 34 of the connecting node unit 3. The steel beam 5 is then bolted to the third flange plate 34 and the through connecting plate 33 of the connecting node unit 3.

[0093] After all components are assembled, grout is injected into the second hollow section 21 through the grouting hole 24 on the second precast steel pipe concrete column 2. The grout fills the second hollow section 21 and flows through the flow gap 37 between the inner steel pipe 31 and the outer steel pipe 32 to the first hollow section 11 of the first precast steel pipe concrete column 1.

[0094] During grouting, overflow hole 14 is used to determine whether grout overflows from the first precast steel-concrete column 1, in order to confirm the compactness and saturation of the grouting at the connection joint. Grouting can be stopped after 3 seconds of overflow from overflow hole 14. After assembly, as follows Figure 8 As shown.

[0095] The present invention provides a precast steel-concrete composite column-beam connection node and construction method. Hollow sections identical to the inner steel pipe anchorage sections are pre-reserved at the lower end of the precast steel-concrete composite upper column and the upper end of the precast steel-concrete composite lower column. Flange plates are welded to the precast steel-concrete composite upper and lower columns and then bolted to the flange plates of the connection node unit. The outer steel pipe and through-connecting plate between the upper and lower flange plates of the connection node unit are welded and fixed. The H-beam is bolted to the connection node unit via the connecting plate, achieving a fully bolted connection between the precast steel-concrete composite column and the H-beam. The node connection of this invention has high fixing strength, good overall node performance, and fast construction speed, thus improving the overall connection strength of the precast steel-concrete composite beam-column system.

[0096] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

[0097] While several specific implementation details are included in the foregoing discussion, these should not be construed as limiting the scope of the invention. Certain features described in the context of individual embodiments may also be implemented in combination in a single implementation. Conversely, various features described in the context of a single implementation may also be implemented individually or in any suitable sub-combination in multiple implementations.

Claims

1. A precast steel-concrete composite column-beam connection node, characterized in that, include: The first precast steel-concrete composite column has a first hollow section in the connection area, and the first precast steel-concrete composite column has a first flange plate at the connection end; The second precast steel-concrete composite column has a second hollow section in the connection area, and the second precast steel-concrete composite column has a second flange plate at the connection end; A connecting node unit is established between the first precast steel-concrete composite column and the second precast steel-concrete composite column. The connecting node unit consists of an inner steel pipe, an outer steel pipe, a through-connecting plate, and two third flange plates. The inner steel pipe is fitted inside the outer steel pipe, with both ends extending beyond the outer steel pipe to form a first post-cast anchorage section and a second post-cast anchorage section, respectively. The through-connecting plate passes through the outer steel pipe from at least one side and is welded to the inner steel pipe. The third flange plates are welded to both ends of the outer steel pipe and simultaneously welded to the through-connecting plate. The first and second precast steel-concrete composite columns are connected by bolts to one of the two third flange plates via the first and second flange plates, respectively. The first post-cast anchorage section is inserted into the first hollow section, and the second post-cast anchorage section is inserted into the second hollow section. The post-grouting layer is formed by post-cast concrete poured into the first hollow section, the second hollow section, and the connecting node unit; The steel beam is bolted to the connecting node unit.

2. The connection node according to claim 1, characterized in that: The first flange plate is welded and fixed to the bottom of the connecting end of the first precast steel pipe concrete column, and the second flange plate is welded and fixed to the top of the connecting end of the second precast steel pipe concrete column, with the flange through hole consistent with the inner cavity of the precast steel pipe concrete column.

3. The connection node according to claim 1, characterized in that: The first precast steel-concrete composite column has multiple first ring-shaped reinforcing bars welded inside the first hollow section, the second precast steel-concrete composite column has multiple second ring-shaped reinforcing bars welded inside the second hollow section, and the inner steel pipe has multiple third ring-shaped reinforcing bars welded outside the first and second post-cast anchorage sections. The first ring-shaped reinforcing bars are positioned corresponding to the second ring-shaped reinforcing bars and are staggered relative to the third ring-shaped reinforcing bars.

4. The connection node according to claim 1, characterized in that: The lengths of the first post-cast anchorage section and the second post-cast anchorage section are the same as the lengths of the first hollow section and the second hollow section. The cross-sectional dimensions of the first post-cast anchorage section and the second post-cast anchorage section are slightly smaller than the cross-sectional dimensions of the first hollow section and the second hollow section.

5. The connection node according to claim 1, characterized in that: The cross-sectional dimensions of the outer steel pipe are the same as those of the first precast steel pipe concrete column and the second precast steel pipe concrete column. The outer steel pipe is welded to the edge of the flange through hole of the third flange plate, and a flow gap is formed between the outer steel pipe and the inner steel pipe.

6. The connection node according to claim 5, characterized in that: The first precast steel-concrete composite column has an overflow hole in its first hollow section, and the second precast steel-concrete composite column has an injection hole in its second hollow section. The post-cast concrete is injected into the second hollow section through the injection hole and fills the flow gap and the first hollow section through the flow gap.

7. The connection node according to claim 1, characterized in that: The third flange plate extends outward on at least one side of the connecting node unit to form an extension section. At least one through connecting plate is welded between the extension sections of the upper and lower third flange plates, and bolt holes are provided on the extension section and the through connecting plate for bolting to the steel beam.

8. The connection node according to claim 7, characterized in that: The third flange plate extends outward on both sides of the connecting node unit to form an extension section, constituting a straight flange plate for connecting the left and right steel beams; or The third flange plate extends outward around the connection node unit to form an extension section, constituting a cross-shaped flange plate for connecting the four steel beams.

9. A construction method for a connection node according to any one of claims 1 to 8, characterized in that... include: The factory manufactures the first precast steel-concrete composite column, the second precast steel-concrete composite column, and the connecting node units; The second precast steel pipe concrete column is fixed on site, the connecting node unit is hoisted onto the second precast steel pipe concrete column, the third flange plate is aligned with the second flange plate and fixed with bolts; The first precast steel pipe concrete column is hoisted onto the connection node unit, and the first flange plate and the third flange plate are aligned and fixed with bolts. The steel beam is hoisted to a fixed position and horizontally aligned with the third flange plate of the connecting node unit. The steel beam is then bolted to the third flange plate of the connecting node unit and the through connecting plate. After all components are assembled, grout is injected into the second hollow section through the grouting holes on the second precast steel pipe concrete column. The grout fills the second hollow section and flows through the flow gap between the inner and outer steel pipes to the first hollow section of the first precast steel pipe concrete column. The grout discharge from the overflow hole on the first precast steel pipe concrete column is determined to confirm whether the grouting at the connection node is dense.

10. The construction method according to claim 9, characterized in that: The factory fabrication of the first precast steel-concrete composite column, the second precast steel-concrete composite column, and the connecting node units specifically involves: A first hollow section is reserved at the bottom of the first precast steel pipe concrete column, an overflow hole is set on the first hollow section, multiple ring steel bars are welded to the inner wall of the first hollow section, a first flange plate is welded to the bottom of the first precast steel pipe concrete column, and finally concrete is poured. A second hollow section is reserved at the top of the second precast steel pipe concrete column. A grouting hole is set on the second hollow section. Multiple ring-shaped steel bars are welded to the inner wall of the second hollow section. A second flange plate is welded to the top of the second precast steel pipe concrete column. Finally, concrete is poured. Assemble and weld the inner steel pipe, outer steel pipe, through connecting plate and third flange plate. The two ends of the inner steel pipe extend out of the outer steel pipe. Weld multiple ring-shaped steel bars on the outer wall of the extended section. Pour concrete inside the inner steel pipe.

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