CN114277937A - Hollow sandwich steel pipe concrete member connecting structure, composite structure and construction method - Google Patents
Hollow sandwich steel pipe concrete member connecting structure, composite structure and construction method Download PDFInfo
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- CN114277937A CN114277937A CN202210117017.XA CN202210117017A CN114277937A CN 114277937 A CN114277937 A CN 114277937A CN 202210117017 A CN202210117017 A CN 202210117017A CN 114277937 A CN114277937 A CN 114277937A
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Abstract
The invention relates to the field of hollow sandwich concrete-filled steel tubes connection, and discloses a hollow sandwich concrete-filled steel tube member connection structure, a composite structure comprising the connection structure and a construction method of the composite structure. By adopting the connecting structure to connect two adjacent hollow sandwich layer concrete filled steel tube members, the connecting strength is ensured, the butt joint connection process of the hollow sandwich layer concrete filled steel tube members is simplified, and the construction efficiency is improved.
Description
Technical Field
The invention relates to the field of hollow sandwich concrete-filled steel tubes connection, in particular to a hollow sandwich concrete-filled steel tube member connection structure, a hollow sandwich concrete-filled steel tube member combination structure and a construction method.
Background
The hollow sandwich steel pipe concrete member is a novel combined structure developed on the basis of a solid steel pipe concrete member, and because the inner steel pipe is adopted to replace the concrete of the core part in the solid steel pipe concrete member, the hollow sandwich steel pipe concrete member not only inherits the advantages of the steel pipe concrete, but also has a plurality of new advantages. Compared with a solid steel tube concrete member, the hollow sandwich steel tube concrete member has the advantages that the cross section is expanded, the bending rigidity is high, the inner hollow part is light in weight, the hollow sandwich steel tube concrete member has good anti-seismic performance and good fire resistance, and the hollow sandwich steel tube concrete member is widely applied to building structures.
Although the hollow sandwich steel pipe concrete member has obvious performance advantages, the hollow sandwich steel pipe concrete member is influenced by complex factors such as environmental factors, structural design, construction process, steel pipe size limitation and the like in engineering application, two independent hollow sandwich steel pipe concrete members are generally required to be connected into a whole in a butt joint mode, the existing connection mode is mainly welding connection, the welding operation amount is large, adverse effects are generated on the performance of the steel pipe, the connection strength of a joint under complex mechanical conditions such as axial pressure and bending is difficult to guarantee, the process is complex, and the construction efficiency is low.
Therefore, how to simplify the butt joint process of the hollow sandwich concrete-filled steel tube members and improve the butt joint construction efficiency of the hollow sandwich concrete-filled steel tube members on the basis of ensuring the joint strength is a problem to be solved by those skilled in the art.
Disclosure of Invention
In order to solve the technical problems, the invention provides a hollow sandwich concrete-filled steel tube member connecting structure, a hollow sandwich concrete-filled steel tube member connecting combination structure and a hollow sandwich concrete-filled steel tube member construction method, which can simplify the butt joint connection process of hollow sandwich concrete-filled steel tube members and improve the construction efficiency on the basis of ensuring the connection strength.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a hollow sandwich steel pipe concrete member connecting structure, which comprises: the middle connecting pipe is superposed with the axes of the two hollow sandwich steel pipe concrete members which are butted with each other; the hollow sandwich steel tube concrete member comprises an outer steel tube and an inner steel tube which are coaxially arranged, the inner steel tube is sleeved inside the outer steel tube, concrete is poured between the inner steel tube and the outer steel tube, two opposite ends of the two hollow sandwich steel tube concrete members are respectively provided with an annular cavity, the annular cavities are arranged between the outer steel tube and the inner steel tube, the outer diameter of each annular cavity is equal to the inner diameter of the outer steel tube, and the inner diameter of each annular cavity is equal to the outer diameter of the inner steel tube; the outer diameter of the middle connecting pipe is equal to the inner diameter of the outer steel pipe, the inner diameter of the middle connecting pipe is larger than the outer diameter of the inner steel pipe, when the outer steel pipe is in a butt joint state, two ends of the middle connecting pipe are respectively arranged in the two annular cavities, two opposite ends of the outer steel pipe are abutted, two opposite ends of the inner steel pipe are abutted, and grouting materials are filled between the middle connecting pipe and the two inner steel pipes.
Preferably, the hollow sandwich concrete-filled steel tube member connection structure further comprises two connecting pieces, and when the hollow sandwich concrete-filled steel tube member connection structure is in the butt joint state, the middle connecting pipe is respectively connected with the two outer steel tubes through the two connecting pieces.
Preferably, the connecting member is an expansion bolt.
The invention also provides a hollow sandwich steel tube concrete member combined structure which comprises two hollow sandwich steel tube concrete members and a hollow sandwich steel tube concrete member connecting structure, wherein the axes of the middle connecting pipe and the two hollow sandwich steel tube concrete members are superposed, two ends of the middle connecting pipe are respectively arranged in the two annular cavities, two opposite ends of the two outer steel tubes are abutted, two opposite ends of the two inner steel tubes are abutted, and grouting materials are filled between the middle connecting pipe and the two inner steel tubes.
Preferably, the hollow sandwich steel tube concrete member composite structure further comprises two plugging structures, and the two plugging structures are respectively embedded into two opposite ends of the inner steel tube so as to respectively plug the two opposite ends of the inner steel tube.
Preferably, the longitudinal section of each blocking structure is a U-shaped structure, two opposite ends of each blocking structure are provided with an outer convex edge, each outer convex edge is arranged between two inner steel pipes, and each inner steel pipe abuts against the corresponding outer convex edge of the corresponding blocking structure.
Preferably, the hollow sandwich concrete-filled steel tube member composite structure further includes two first locating parts and two second locating parts, the two first locating parts are respectively disposed in the two annular cavities, two ends of the intermediate connecting pipe respectively abut against the two first locating parts, the two second locating parts are respectively disposed at two end parts of the two hollow sandwich concrete-filled steel tube member connecting structures, which are far away from each other, and the second locating parts are disposed between the inner steel tube and the outer steel tube.
Preferably, the first locating part includes a plurality of edges the first limiting plate that interior steel pipe circumference evenly set up, the second locating part includes a plurality of edges the second limiting plate that the circumference of interior steel pipe is even sets up.
Preferably, the hollow sandwich steel tube concrete member composite structure further comprises a grouting pipe, a slurry outlet pipe and a plugging cap, one of two ends of the two ends, far away from each other, of the two annular cavities is communicated with the grouting pipe, the other end of the two ends is communicated with the slurry outlet pipe, the plugging cap is detachably connected with the grouting pipe, and the plugging cap is used for opening or closing the grouting pipe.
The invention also provides a construction method of the hollow sandwich concrete-filled steel tube member composite structure, which comprises the following steps:
firstly, prefabricating two hollow sandwich steel tube concrete members in a factory; and step two, connecting the two hollow sandwich steel pipe concrete members by adopting the hollow sandwich steel pipe concrete member connecting structure.
Compared with the prior art, the invention has the following technical effects:
the hollow sandwich steel tube concrete member connecting structure provided by the invention comprises a middle connecting tube, wherein the middle connecting tube is superposed with the axes of two hollow sandwich steel tube concrete members which are butted with each other; the hollow sandwich steel tube concrete member comprises an outer steel tube and an inner steel tube which are coaxially arranged, the inner steel tube is sleeved in the outer steel tube, concrete is poured between the inner steel tube and the outer steel tube, two opposite ends of the two hollow sandwich steel tube concrete members are respectively provided with an annular cavity, the annular cavities are arranged between the outer steel tube and the inner steel tube, the outer diameter of each annular cavity is equal to the inner diameter of the outer steel tube, and the inner diameter of each annular cavity is equal to the outer diameter of the inner steel tube; the external diameter of intermediate junction pipe equals the internal diameter of outer steel pipe, and the internal diameter of intermediate junction pipe is greater than the external diameter of interior steel pipe, and when being in the butt joint state, the both ends of intermediate junction pipe set up respectively in two annular cavities, and the two relative both ends of two outer steel pipes offset, and the two relative both ends of two interior steel pipes offset, and all pack between intermediate junction pipe and two interior steel pipes has the grout material. Compared with welding connection, the hollow sandwich concrete-filled steel tube member connecting structure is adopted to connect two adjacent hollow sandwich concrete-filled steel tube members, so that the connecting strength is ensured, the butt joint connection process of the hollow sandwich concrete-filled steel tube members is simplified, and the construction efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural view of a hollow sandwich concrete filled steel tube member connection structure provided in an embodiment of the present invention;
FIG. 2 is an isometric view of a hollow sandwich concrete filled steel tube member composite structure provided in an embodiment of the present invention;
FIG. 3 is a cross-sectional view of FIG. 2;
FIG. 4 is a schematic view of the internal structure of FIG. 2;
FIG. 5 is an assembled integral top view of a hollow sandwich concrete filled steel tube member and a middle connection tube provided below in an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a plugging structure in an embodiment of the present invention;
fig. 7 is a schematic view of a construction method of a hollow sandwich concrete filled steel tube member composite structure provided in an embodiment of the present invention.
Description of reference numerals: 1. the hollow sandwich steel pipe concrete member connecting structure; 101. a middle connecting pipe; 102. a connecting member; 103. concrete; 104. grouting material; 2. a hollow sandwich concrete filled steel tube member; 201. an outer steel tube; 202. an inner steel tube; 203. an annular cavity; 204. a first limit piece; 205. a second limiting member; 206. a blocking structure; 207. an outer convex edge; 208. a grouting pipe; 209. a horizontal segment; 210. a plugging cap; 211. an arc segment.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a hollow sandwich concrete-filled steel tube member connecting structure, a hollow sandwich concrete-filled steel tube member connecting combination structure and a hollow sandwich concrete-filled steel tube member construction method, which can simplify the butt joint connection process of hollow sandwich concrete-filled steel tube members and improve the construction efficiency on the basis of ensuring the connection strength.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1 to 7, the present embodiment provides a hollow sandwich concrete filled steel tube member connecting structure 1 including: the middle connecting pipe 101, the middle connecting pipe 101 coincides with the axes of the two hollow sandwich steel pipe concrete members 2 which are butted with each other; the hollow sandwich steel tube concrete member 2 comprises an outer steel tube 201 and an inner steel tube 202 which are coaxially arranged, the inner steel tube 202 is sleeved inside the outer steel tube 201, concrete 103 is poured between the inner steel tube 202 and the outer steel tube 201, two opposite ends of the two hollow sandwich steel tube concrete members 2 are respectively provided with an annular cavity 203, the annular cavities 203 are arranged between the outer steel tube 201 and the inner steel tube 202, the outer diameter of each annular cavity 203 is equal to the inner diameter of the outer steel tube 201, and the inner diameter of each annular cavity 203 is equal to the outer diameter of the inner steel tube 202; the external diameter of intermediate junction pipe 101 equals the internal diameter of outer steel pipe 201, and the internal diameter of intermediate junction pipe 101 is greater than the external diameter of interior steel pipe 202, and when being in butt joint state, the both ends of intermediate junction pipe 101 set up respectively in two toroidal cavity 203, and the two relative both ends of two outer steel pipe 201 offset, and the two relative both ends of two interior steel pipe 202 offset, and all pack grout material 104 between intermediate junction pipe 101 and two interior steel pipe 202. Compared with welding connection, the hollow sandwich concrete-filled steel tube member connecting structure 1 is adopted to connect two adjacent hollow sandwich concrete-filled steel tube members 2, so that the connecting strength is ensured, the butt joint connection process of the hollow sandwich concrete-filled steel tube members 2 is simplified, and the construction efficiency is improved.
In this embodiment, as shown in fig. 1 to 3, the hollow sandwich steel pipe concrete member connection structure 1 further includes two connection members 102, and in the butt joint state, the middle connection pipe 101 is connected to two outer steel pipes 201 through the two connection members 102, respectively. The number of connecting pieces 102 is specifically 8 in this embodiment, and each outer steel pipe 201 is connected with middle connecting pipe 101 through four connecting pieces 102, and four connecting pieces 102 are evenly arranged along the circumference of middle connecting pipe 101.
Further, in the present embodiment, specifically, the connecting member 102 is an expansion bolt. It should be noted that the connecting member 102 is not limited to the expansion bolt, and other structures capable of connecting the intermediate connecting pipe 101 and the outer steel pipe 201 may be used.
In the present embodiment, as shown in fig. 2, the cross sections of the inner steel pipe 202, the outer steel pipe 201, and the intermediate connection pipe 101 are all circular, but are not limited to circular, and may be other shapes such as square. In addition, in the embodiment, the material of the intermediate connection pipe 101 is the same as the material of the inner steel pipe 202 and the material of the outer steel pipe 201, but the material of the intermediate connection pipe 101 is not limited to the steel material, and other materials capable of achieving the connection strength may be selected.
As shown in fig. 2-3, the present embodiment further provides a hollow sandwich steel tube concrete member combination structure, which includes two hollow sandwich steel tube concrete members 2 and a hollow sandwich steel tube concrete member connection structure 1, the axes of the middle connection pipe 101 and the two hollow sandwich steel tube concrete members 2 coincide, two ends of the middle connection pipe 101 are respectively disposed in the two annular cavities 203, two opposite ends of the two outer steel tubes 201 abut against each other, two opposite ends of the two inner steel tubes 202 abut against each other, and a grouting material 104 is filled between the middle connection pipe 101 and the two inner steel tubes 202.
In this embodiment, in order to prevent the concrete 103 from entering the inner steel pipes 202, as shown in fig. 3 and 6, the hollow sandwich steel pipe concrete member combination structure further includes two plugging structures 206, and the two plugging structures 206 are respectively embedded into two opposite ends of the two inner steel pipes 202 to respectively plug the two opposite ends of the two inner steel pipes 202.
Further, in this embodiment, specifically, as shown in fig. 6, the longitudinal section of the blocking structure 206 is a U-shaped structure, two opposite ends of the two blocking structures 206 are both provided with an outer convex edge 207, the outer convex edge 207 is disposed between the two inner steel pipes 202, and the inner steel pipes 202 abut against the outer convex edge 207 of the corresponding blocking structure 206. So set up, interior steel pipe 202 shutoff is effectual.
In this embodiment, as shown in fig. 2 to 4, the hollow sandwich concrete-filled steel tube member combination structure further includes two first limiting parts 204 and two second limiting parts 205, the two first limiting parts 204 are respectively disposed in the two annular cavities 203, two ends of the middle connecting tube 101 respectively abut against the two first limiting parts 204, the two second limiting parts 205 are respectively disposed at two end portions of the two hollow sandwich concrete-filled steel tube member connection structures 1, which are far away from each other, and the second limiting parts 205 are disposed between the inner steel tube 202 and the outer steel tube 201. In this embodiment, two ends of the two annular cavities 203, which are relatively far away from each other, are respectively provided with a first limiting member 204. The axial position of the intermediate connection pipe 101 in the hollow sandwich concrete-filled steel tube member 2 can be accurately controlled by providing the first stopper 204.
In this embodiment, as shown in fig. 4, the first limiting member 204 includes a plurality of first limiting plates uniformly arranged along the circumferential direction of the inner steel pipe 202, and the second limiting member 205 includes a plurality of second limiting plates uniformly arranged along the circumferential direction of the inner steel pipe 202. Specifically, first limiting plate and second limiting plate are the steel sheet, and the both ends of first limiting plate and second limiting plate are equallyd divide and are connected with interior steel pipe 202 and outer steel pipe 201 respectively.
In this embodiment, as shown in fig. 2-3, the hollow sandwich steel tube concrete member combination structure further includes a grouting pipe 208, a grout outlet pipe, and a plugging cap 210, one of two ends of the two annular cavities 203 far away from each other is communicated with the grouting pipe 208, the other end is communicated with the grout outlet pipe, the plugging cap 210 is detachably connected with the grouting pipe 208, and the plugging cap 210 is used for opening or closing the grouting pipe 208.
Specifically, the two hollow sandwich steel tube concrete members 2 are arranged in the annular cavity 203 of the hollow sandwich steel tube concrete member 2 below and communicated with the grouting pipe 208, the annular cavity 203 of the hollow sandwich steel tube concrete member 2 above is communicated with the grout outlet pipe, the grout outlet pipe comprises a horizontal segment 209 and an arc-shaped segment 211, one end of the horizontal segment 209 is communicated with the annular cavity 203, the other end of the horizontal segment is communicated with one end of the arc-shaped segment 211, and one end of the arc-shaped segment 211, which is far away from the horizontal segment 209, is higher than the horizontal segment 209. Further, the grouting pipe 208 is disposed below the first limiting member 204, the slurry outlet pipe is disposed above the first limiting member 204, and the grouting pipe 208 and the slurry outlet pipe are both circumferentially located at the middle position of the two first limiting plates. In a specific using process, after grouting is stopped, the liquid level of grouting material 104 in the grout outlet pipe descends, and after the grouting pipe 208 is blocked by using the blocking cap 210, the liquid level stops descending, and the grout outlet pipe is arranged above the first limiting part 204, so that the final liquid level height of the grouting material 104 in the grout outlet pipe is still higher than the top surface height of the first limiting part 204, grouting fullness at the joint of two hollow sandwich steel pipe concrete members 2 is ensured, and the height of the grout outlet pipe higher than the top surface of the first limiting part 204 is determined according to specific conditions.
Further, the grouting pipe 208 is screwed with the plugging cap 210, and opposite ends of the horizontal segment 209 and the arc segment 211 of the grout outlet pipe are screwed.
As shown in fig. 7, the construction method of the hollow sandwich steel tube concrete member composite structure provided by the embodiment includes the following steps:
firstly, prefabricating two hollow sandwich steel pipe concrete members 2 in a factory; and step two, connecting the two hollow sandwich steel pipe concrete members 2 by adopting a hollow sandwich steel pipe concrete member connecting structure 1.
In this embodiment, specifically, in the first step, when the hollow sandwich steel tube concrete member 2 arranged below is prefabricated, the blocking structure 206 is firstly placed at the top of the inner steel tube 202, then the outer steel tube 201 is placed on a horizontal ground, the inner steel tube 202 is placed in the outer steel tube 201, a first limiting plate and a second limiting plate are arranged between the inner steel tube 202 and the outer steel tube 201, then the concrete 103 is poured between the inner steel tube 202 and the outer steel tube 201, and pouring is stopped after the slurry is discharged from the grouting pipe 208, so that the hollow sandwich steel tube concrete member 2 can be formed;
when the hollow sandwich steel tube concrete member 2 arranged above is prefabricated, the blocking structure 206 is firstly placed at the bottom of the inner steel tube 202, then the inner steel tube 202 is inverted, the inverted inner steel tube 202 is placed inside the inverted outer steel tube 201, the first limiting plate and the second limiting plate are arranged between the inner steel tube 202 and the outer steel tube 201, then the concrete 103 is poured between the inner steel tube 202 and the outer steel tube 201, and pouring is stopped after slurry flows out of a slurry tube, so that the hollow sandwich steel tube concrete member 2 can be formed.
In the second step, when connecting, the hollow sandwich steel pipe concrete member 2 arranged below is firstly fixed on the horizontal ground, the intermediate connection pipe 101 is then placed in the annular cavity 203 of the hollow sandwich concrete-filled steel tube member 2 disposed below, and the bottom surface of the intermediate connection pipe 101 abuts against the top surface of the first stopper plate, and then the outer steel pipe 201 of the hollow sandwich concrete-filled steel tube member 2 disposed therebelow is connected with the intermediate connection pipe 101 using an expansion bolt, then, the hollow sandwich steel tube concrete member 2 disposed above is fitted outside the intermediate connection pipe 101, the intermediate connection pipe 101 is fitted in the annular cavity 203 of the hollow sandwich steel tube concrete member 2 disposed above, and then the outer steel tube 201 of the hollow sandwich steel tube concrete member 2 disposed above is connected to the intermediate connection pipe 101 using an expansion bolt, so that the connection can be completed.
After the connection is completed, the arc-shaped section 211 of the grout outlet pipe is connected with the horizontal section 209, then grouting materials 104 are poured into the two annular cavities 203 through the grouting pipe 208, after grout flows out of the grout outlet pipe, a grouting nut is used for screwing the grouting pipe 208 for plugging, grouting can be completed, and after the grouting is completed, the two hollow sandwich steel pipe concrete members 2 are connected through the hollow sandwich steel pipe concrete member connecting structure 1 to form a whole, namely, the hollow sandwich steel pipe concrete member combined structure.
The hollow sandwich steel pipe concrete member combined structure provided by the invention is prefabricated in a factory, the middle connecting pipe 101 is placed in the sandwich space between the inner steel pipe 202 and the outer steel pipe 201 of the two hollow sandwich steel pipe concrete members 2 for assembly on site, local grouting is carried out after the reinforcement by using the connecting piece 102, the grouting connection and the connecting piece 102 are connected and combined to form a plurality of fastening connection defense lines, the joint connection strength is strengthened, the construction process can be simplified, and the construction efficiency is improved.
It should be noted that the top, bottom, upper and lower in the present embodiment refer to those when they are arranged as shown in fig. 1.
The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. A hollow sandwich concrete-filled steel tube member connection structure, comprising:
the middle connecting pipe is superposed with the axes of the two hollow sandwich steel pipe concrete members which are butted with each other;
the hollow sandwich steel tube concrete member comprises an outer steel tube and an inner steel tube which are coaxially arranged, the inner steel tube is sleeved inside the outer steel tube, concrete is poured between the inner steel tube and the outer steel tube, two opposite ends of the two hollow sandwich steel tube concrete members are respectively provided with an annular cavity, the annular cavities are arranged between the outer steel tube and the inner steel tube, the outer diameter of each annular cavity is equal to the inner diameter of the outer steel tube, and the inner diameter of each annular cavity is equal to the outer diameter of the inner steel tube;
the outer diameter of the middle connecting pipe is equal to the inner diameter of the outer steel pipe, the inner diameter of the middle connecting pipe is larger than the outer diameter of the inner steel pipe, when the outer steel pipe is in a butt joint state, two ends of the middle connecting pipe are respectively arranged in the two annular cavities, two opposite ends of the outer steel pipe are abutted, two opposite ends of the inner steel pipe are abutted, and grouting materials are filled between the middle connecting pipe and the two inner steel pipes.
2. The hollow sandwich steel pipe concrete structure according to claim 1, further comprising two connecting members, wherein in the butt joint state, the intermediate connecting pipe is connected to the two outer steel pipes through the two connecting members, respectively.
3. The hollow sandwich steel pipe concrete member connection structure according to claim 2, wherein the connector is an expansion bolt.
4. A hollow sandwich concrete-filled steel tube member composite structure, which is characterized by comprising two hollow sandwich concrete-filled steel tube members and the hollow sandwich concrete-filled steel tube member connection structure as claimed in any one of claims 1 to 3, wherein the axis of the middle connecting pipe coincides with the axes of the two hollow sandwich concrete-filled steel tube members, two ends of the middle connecting pipe are respectively arranged in the two annular cavities, two opposite ends of the two outer steel tubes are abutted, two opposite ends of the two inner steel tubes are abutted, and grouting materials are filled between the middle connecting pipe and the two inner steel tubes.
5. The hollow sandwich steel pipe concrete member composite structure according to claim 4, further comprising two plugging structures embedded in opposite ends of the two inner steel pipes, respectively, to plug the opposite ends of the two inner steel pipes, respectively.
6. The hollow sandwich steel tube concrete member composite structure of claim 5, characterized in that the longitudinal section of the blocking structure is a U-shaped structure, two opposite ends of the two blocking structures are provided with outer convex edges, the outer convex edges are arranged between the two inner steel tubes, and the inner steel tubes are abutted against the outer convex edges of the corresponding blocking structures.
7. The hollow sandwich steel tube concrete member composite structure according to claim 4, further comprising two first position-limiting parts and two second position-limiting parts, wherein the two first position-limiting parts are respectively disposed in the two annular cavities, two ends of the intermediate connecting tube respectively abut against the two first position-limiting parts, the two second position-limiting parts are respectively disposed at two end parts of the hollow sandwich steel tube concrete member connecting structure, which are far away from each other, and the second position-limiting parts are disposed between the inner steel tube and the outer steel tube.
8. The hollow sandwich steel tube concrete member composite structure according to claim 7, wherein the first limiting member comprises a plurality of first limiting plates which are uniformly arranged along the circumferential direction of the inner steel tube, and the second limiting member comprises a plurality of second limiting plates which are uniformly arranged along the circumferential direction of the inner steel tube.
9. The hollow sandwich steel tube concrete member composite structure of claim 4, further comprising a grouting pipe, a grout outlet pipe and a plugging cap, wherein one of two ends of the two annular cavities far away from each other is communicated with the grouting pipe, the other end of the two annular cavities is communicated with the grout outlet pipe, the plugging cap is detachably connected with the grouting pipe, and the plugging cap is used for opening or closing the grouting pipe.
10. A construction method of a hollow sandwich steel pipe concrete member composite structure according to any one of claims 4 to 9, characterized by comprising the steps of:
firstly, prefabricating two hollow sandwich steel tube concrete members in a factory;
and step two, connecting the two hollow sandwich steel pipe concrete members by adopting the hollow sandwich steel pipe concrete member connecting structure.
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